SANDER

TECHNICAL FIELD

The present application relates to a power tool, in particular, to a sander.

BACKGROUND

A sander is a power tool for the sanding operation and is often used for sanding uneven or unevenly thick wall surfaces, desk surfaces, and the like to obtain a surface with target smoothness. The sander is also referred to as a belt sander, a grinder, or a polisher. A handheld sander is an important category of sanders and is widely used in various industries due to advantages such as the compact size and portability.

The sander produces dust when performing the sanding operation. The dust can be sucked into the interior of the sander housing and discharged in a specific direction. Therefore, the smaller the dust suction resistance, the higher the dust collection efficiency of the sander.

SUMMARY

The present application adopts the technical solutions described below. A sander includes an airflow element rotatable about a central axis along a preset direction of rotation to generate a dust removal airflow; an electric motor for providing a power source for the airflow element; and a battery pack for providing an energy source for the electric motor. When the sander is in a load-free state, the working duration of the sander when the battery pack consumes 10 WH of energy is defined as the functional time T of the sander; and the product of the load-free rotational speed N of the electric motor and the functional time T of the sander is greater than or equal to 63000 rpm·min and less than or equal to 120000 rpm·min.

A sander includes an airflow element rotatable about a central axis along a preset direction of rotation to generate a dust removal airflow; an electric motor for providing a power source for the airflow element; a battery pack for providing an energy source for the electric motor; and a housing configured to accommodate the airflow element and guide the dust removal airflow generated by the airflow element. A guide wall is formed on the back of the housing, the distance from the guide wall to the central axis is defined as a first distance D1, and the first distance D1 gradually increases along the preset direction of rotation; and an inner wall includes a first end and a second end along a plane perpendicular to the central axis, the guide wall connects the first end to the second end, and the distance from the first end to the central axis is greater than or equal to 40 mm and less than or equal to 60 mm.

A sander includes an airflow element rotatable about a central axis along a preset direction of rotation to generate a dust removal airflow; an electric motor for providing a power source for the airflow element; a battery pack for providing an energy source for the electric motor; and a housing configured to accommodate the airflow element and guide the dust removal airflow generated by the airflow element. The housing includes an upper sidewall and a lower sidewall opposite to the upper sidewall; and the distance from the lower sidewall to the upper sidewall along a direction of the central axis is defined as a third distance D3, and the third distance D3 gradually increases along the preset direction of rotation.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of a sander according to the present application;

FIG. 2 is a perspective view of the sander shown in FIG. 1 with part of a housing removed;

FIG. 3 is a plan view of the whole sander shown in FIG. 1;

FIG. 4 is a sectional view of the sander shown in FIG. 3 along an A-A direction;

FIG. 5 is a sectional view of the sander shown in FIG. 3 along a B-B direction;

FIG. 6 is a partial enlarged view of the sectional view of the sander in FIG. 5;

FIG. 7 is a simplified sectional view of an airflow element and a dust removal housing in the present application;

FIG. 8 is another simplified sectional view of an airflow element and a dust removal housing in the present application;

FIG. 9 is a perspective view of a centrifugal fan in the sander shown in FIG. 1;

FIG. 10 is a perspective view of the centrifugal fan shown in FIG. 9 from another perspective;

FIG. 11 is a plan view of the centrifugal fan shown in FIG. 9;

FIG. 12 is a partial enlarged view of the centrifugal fan shown in FIG. 11;

FIG. 13 is a perspective view of part of a dust removal housing in FIG. 3;

FIG. 14 is a schematic structural diagram of a sanding machine provided by this application;

FIG. 15 is a schematic diagram 1 of the exploded structure of a sanding machine provided by this application;

FIG. 16 is a schematic diagram 2 of the exploded structure of a sanding machine provided by this application;

FIG. 17 is a schematic diagram 3 of the exploded structure of a sanding machine provided by this application;

FIG. 18 is a partial structural schematic diagram of a sanding machine provided by this application;

FIG. 19 is a partial structural front view of a sanding machine provided by this application;

FIG. 20 is a partial structural top view of a sanding machine provided by this application;

FIG. 21 is a schematic structural diagram of a dust collection device and filter provided by this application;

FIG. 22 is a schematic diagram of the exploded structure of a dust collecting device and filter provided by this application;

FIG. 23 is a schematic structural diagram of a dust collecting device provided by this application;

FIG. 24 is a front view of a dust collecting device provided by this application;

FIG. 25 is a schematic structural diagram of another dust collection device provided by this application;

FIG. 26 is a front view of another dust collecting device provided by this application;

FIG. 27 is a schematic structural diagram of yet another dust collection device provided by this application;

FIG. 28 is a partial structural schematic diagram of yet another dust collection device provided by this application;

FIG. 29 is a cross-sectional view of yet another dust collecting device provided by the present application;

FIG. 30 is a partial structural schematic diagram 2 of yet another dust collection device provided by this application;

FIG. 31 is a partial structural schematic diagram 3 of yet another dust collecting device provided by this application;

FIG. 32 is a front view of another sanding machine provided by this application;

FIG. 33 is a side view of another sander provided by the present application; and

FIG. 34 is a schematic structural diagram of yet another sanding machine provided by this application.

DETAILED DESCRIPTION

The present invention is described below in detail in conjunction with drawings and examples.

FIG. 1 shows a sander 100 with a dust removal device 10, and the sander 100 can drive a functional element to move, where the functional element may be sandpaper so that the sander 100 can sand and smooth surfaces of workpieces of various materials through the functional element. The sander 100 generates a large amount of debris during the grinding process, and the debris is sucked into the dust removal device 10 during the grinding process. The dust removal device 10 discharges the debris to a preset position. A user mounts a dust collection device at the preset position so as to discharge the debris discharged from the dust removal device 10 into the dust collection device, thereby achieving a dust collection effect. Therefore, it is extremely necessary to provide the airflow dust removal device 10 for dust removal on the sander 100. At the same time, it is to be noted that the dust removal device 10 is not only used on the sander 100 but also used on other power tools that require dust collection and/or dust removal. Further, the dust removal device 10 may be integrally formed with the power tool. Alternatively, the dust removal device 10 may be separated from the power tool, that is, the power tool and the dust removal device 10 are two separate machines and mate with each other during operation to implement the functions of dust collection and/or dust removal.

The sander 100 is used as an example for the description below. For ease of description, the upper, lower, left, right, front, and rear are defined as shown in FIG. 1.

As shown in FIGS. 1 to 6, the sander 100 includes a housing 20, a switching assembly 30, a base plate assembly 40, a power assembly 50, the dust removal device 10, an eccentric element 60, and an energy source 70.

The housing 20 forms the appearance of the sander 100, and the housing 20 is formed with at least a handle portion 21, an accommodation portion 22, and a bracket portion 23. The handle portion 21 is used for the user to hold, where an end of the handle portion 21 is connected to the accommodation portion 22, and the other end of the handle portion 21 may be used for connecting an external power cable or may form a connecting seat for mounting a portable direct current power supply such as a battery pack. The accommodation portion 22 is located between the handle portion 21 and the bracket portion 23, an accommodation cavity is formed inside the accommodation portion 22, and the power assembly 50 is at least partially disposed in the accommodation cavity. The bracket portion 23 is used for covering the dust removal device 10 and at least part of the base plate assembly 40.

The switching assembly 30 may be mounted on the housing 20. Specifically, the switching assembly 30 is mounted on the handle portion 21 so that it is relatively convenient for the user to trigger the switching assembly 30 when the user holds the handle portion 21.

The power assembly 50 can be driven by the switching assembly 30. The power assembly 50 includes an electric motor 51. The electric motor 51 serves as the prime mover of the sander 100 and is disposed in the housing 20. The electric motor 51 includes a motor shaft 52 for outputting power, and the motor shaft 52 rotates around a motor axis 101. In this example, the motor axis 101 extends basically along an up and down direction.

The dust removal device 10 includes an airflow element 11 drivable by the electric motor 51. That is, the airflow element 11 is drivable by the electric motor 51 to rotate about a central axis 102. When rotating, the airflow element 11 can generate an airflow for dust removal. In this example, the central axis 102 extends basically along the up and down direction.

The eccentric element 60 surrounds the motor shaft 52, and the eccentric element 60 is eccentrically disposed relative to the motor shaft 52. The eccentric element 60 is mounted to the motor shaft 52 and fixedly connected to the motor shaft 52. It is to be noted that the eccentric element 60 being eccentrically disposed relative to the motor shaft 52 means that the eccentric element 60 has an axis, and the axis is parallel to the motor axis 101 of the motor shaft 52 and has a distance d from the motor axis 101 of the motor shaft 52. The distance d exists so that when the motor shaft 52 rotates, the eccentric element 60 can transmit the rotation of the motor shaft 52 into the rotation and revolution of other components connected to the eccentric element 60. In this example, the axis of the eccentric element 60 basically coincides with the central axis 102.

The motor shaft 52 can drive the base plate assembly 40 so that the base plate assembly 40 can swing relative to the housing 20. Specifically, the base plate assembly 40 is fixedly connected to the eccentric element 60, that is to say, the motor shaft 52 transmits power to the base plate assembly 40 through the eccentric element 60. The base plate assembly 40 includes a base plate with a through hole. The base plate includes an upper surface and a lower surface that are opposite to each other. The through hole penetrates the upper surface and the lower surface. The lower surface is disposed on a side away from the eccentric element 60 relative to the upper surface. The lower surface is used for mounting the functional element such as the sandpaper and is provided with multiple through holes. Driven by the motor shaft 52 and the eccentric element 60, the base plate can move eccentrically. When the base plate moves eccentrically, the surface of a workpiece to be sanded can be continuously rubbed with the sandpaper, thereby implementing the function of sanding and polishing the workpiece to be sanded.

The energy source 70 is used for providing a source of energy for the sander 100. The energy source 70 may be alternating current power or direct current power such as the battery pack or another portable mobile power supply.

The dust removal device 10 further includes a dust removal housing 12 fixedly connected to or integrally formed with the housing 20. The dust removal housing 12 is configured to accommodate the airflow element 11, that is, the inner wall of the dust removal housing 12 forms a first space 110 for accommodating the airflow element 11. The inner wall of the dust removal housing 12 further forms a guide channel 13 for guiding the dust removal airflow. In this example, the housing 20 forms the preceding dust removal housing 12. Specifically, when the sander 100 starts to operate, the motor shaft 52 drives the airflow element 11 to rotate about the central axis 102 along a preset direction of rotation 103, and the airflow element 11 generates negative pressure during the rotation process, so as to suck the air on the lower surface into the first space 110 through the through holes. At this time, the rotating airflow element 11 throws the sucked airflow out along the outer periphery of the airflow element 11. The flowing airflow sucks the debris generated during the grinding process of the sandpaper into the first space 110 through the through holes, and the guide channel 13 formed by the dust removal housing 12 guides the flow direction of the airflow with the debris and guides the airflow to the preset position. An air outlet 14 is provided at the preset position and is used for discharging the airflow with the debris out of the first space 110. It is to be noted that in the example in which the dust removal device 10 is separated from the power tool, the dust removal housing 12 of the dust removal device 10 is separated from the housing 20. It is to be noted that the preset direction of rotation 103 refers to the direction of rotation of the airflow element 11 when the electric motor 51 drives the airflow element 11 to rotate. To facilitate the description of the technical solutions, in the present application, the preset direction of rotation 103 is defined as a first direction shown in FIG. 2.

Further, the dust removal housing 12 includes a first housing portion 121 and a second housing portion 122, and the first housing portion 121 and the second housing portion 122 are detachably and fixedly connected, that is, the first space 110 is formed by fixedly connecting the first housing portion 121 to the second housing portion 122. Since the sander 100 generates strong vibrations when operating, to ensure the connection stability between the first housing portion 121 and the second housing portion 122, the first housing portion 121 and the second housing portion 122 are fixedly connected through a fixing member 123, where the fixing member 123 for fixing is disposed outside the first space 110, that is to say, the fixing member 123 is not disposed in the guide channel 13. In this manner, the following can be avoided: the fixing member 123 is disposed in the guide channel 13, affecting the circulation of the dust removal airflow, increasing the dust suction resistance of the sander 100, and affecting the dust suction effect.

An upper sidewall 125 and a lower sidewall 126 that are oppositely disposed along the direction of the central axis 102 and a guide wall 124 for guiding the flow direction of the dust removal airflow are formed on the inner wall of the dust removal housing 12. The guide wall 124 is disposed between the upper sidewall 125 and the lower sidewall 126 and connects the upper sidewall 125 to the lower sidewall 126. The guide wall 124 is disposed in the circumferential direction of the airflow element 11. The guide wall 124, the upper sidewall 125, and the lower sidewall 126 basically form the preceding guide channel 13. The airflow element 11 has a plane of rotation P when rotating about the central axis 102. The upper sidewall 125 is located in the plane of rotation P, and the central axis 102 is perpendicular to the plane of rotation P. It is to be noted that the case referred to in the present application where the guide wall 124, the upper sidewall 125, and the lower sidewall 126 form the preceding guide channel 13 is not strictly limited to the case where the guide channel 13 is formed by only the guide wall 124, the upper sidewall 125, and the lower sidewall 126, part of the guide channel 13 is allowed to be formed by other components, and the guide part of the guide channel 13 that mainly achieves the dust removal airflow is formed by the guide wall 124, the upper sidewall 125, and the lower sidewall 126.

Along the direction perpendicular to the central axis 102, the distance from the guide wall 124 to the central axis 102 is defined as a first distance D1, where the first distance D1 gradually increases along the preset direction of rotation 103, that is to say, along the preset direction of rotation 103, the distance between the guide wall 124 and the central axis 102 gradually increases, that is, the guide channel 13 gradually increases along the preset direction of rotation 103, that is to say, along the direction of the plane of rotation P, the width of the upper sidewall 125 in the preset direction of rotation 103 gradually increases. In this manner, the dust suction resistance when the dust removal airflow circulates along the guide channel 13 can be reduced, the dust suction performance can be improved, the energy consumption of the sander 100 during operation can be reduced, and the working time of the sander 100 can be extended. It is to be noted that the gradual increase here refers to an increase according to a certain rule, which may be a linear rule or a nonlinear rule.

The airflow element 11 has the farthest end 111, where the farthest end 111 refers to an end of the airflow element 11 farthest from the central axis 102 in the direction of the plane of rotation P. Without the influence of an external force, the farthest end 111 of the airflow element 11 forms a circle when rotating about the central axis 102 along the preset direction of rotation 103. The distance from the guide wall 124 to the preceding circle is defined as a second distance D2, where along the direction of the plane of rotation P, the second distance D2 gradually increases along the preset direction of rotation 103. It is to be noted that the airflow element 11 is not necessarily regular, that is to say, at least one farthest end 111 exists. As an example, the outer periphery of the airflow element 11 is approximately triangular (as shown in FIG. 8). As another example, the outer periphery of the airflow element 11 is approximately rectangular (as shown in FIG. 7). Of course, in some other examples, the outer periphery of the airflow element 11 is approximately polygonal. In this example, the outer periphery of the airflow element 11 is approximately circular, that is, the distance from the outer periphery of the airflow element 11 to the central axis 102 along the direction of the plane of rotation P is basically the same. That is, it is to be understood that the radius of the circle formed during the rotation of the airflow element 11 along the preset direction of rotation 103 is basically consistent with the radius of the circle formed by the outer periphery of the airflow element 11. That is to say, the distance from the inner wall of the dust removal housing 12 to the outer periphery of the airflow element 11 gradually increases along the preset direction of rotation 103. In this example, the airflow element 11 is specifically a centrifugal fan 15.

The air outlet 14 is formed on the first housing portion 121 or the second housing portion 122. The air outlet 14 is used for discharging the airflow in the guide channel 13 out of the first space 110. The air outlet 14 is formed by the guide wall 124 and the upper sidewall 125. Along the direction of the plane of rotation P, the ratio of the width of the air outlet 14 to the radius of the airflow element 11 is greater than or equal to 1 and less than or equal to 1.5. In the case where other conditions remain unchanged, the larger the radius of the airflow element 11, the larger the air volume of the generated dust removal airflow so that the dust collection efficiency of the sander 100 can be improved. That is, within the same unit of time, the larger the radius of the airflow element 11, the higher the dust collection efficiency of the sander 100. Similarly, under the same conditions, the larger the width of the air outlet 14, the larger the air output at the same time. Therefore, the larger the width of the air outlet 14, the higher the dust collection efficiency of the sander 100. The width of the air outlet 14 and the radius of the airflow element 11 are set within the preceding range, thereby facilitating the discharge of the dust removal airflow in the first space 110. Further, in this example, on the plane of rotation P, the width of the air outlet 14 is greater than or equal to 40 mm and less than or equal to 65 mm. It is to be noted that the width of the air outlet 14 refers to the farthest distance (that is, L shown in FIG. 4) between the sidewalls forming the air outlet 14 in the direction along the plane of rotation P and perpendicular to the central axis 102. Further, the ratio of the width of the air outlet 14 to the radius of the airflow element 11 is greater than or equal to 1.1 and less than or equal to 1.3. The ratio of the width of the air outlet 14 to the radius of the airflow element 11 is set within the preceding range so that not only is the dust collection efficiency of the sander 100 high, but also the following is avoided: the area of the projection of the guide channel 13 of the sander 100 on the plane of rotation P is too large, the overall dimension of the sander 100 is too large, or the sander 100 is inconvenient to operate.

Along the direction of the plane of rotation P, the inner wall of the dust removal housing 12 includes at least a structural section 127 that satisfies the Archimedean spiral equation, that is, the inner wall of the guide channel 13 includes at least one section whose extension direction satisfies the Archimedean spiral equation, that is to say, the interior of the guide channel 13 may be formed by connecting multiple structural sections 127 that satisfy different rules (as shown in FIGS. 7 and 8), where the different rules may be linear rules or nonlinear rules, or the multiple structural sections 127 may include both the linear rules and nonlinear rules. Further, to facilitate design and manufacturing, the inner wall of the guide channel 13 extends in the form of an Archimedean spiral, and the extension direction satisfies the Archimedean spiral equation. In this example, two ends of the inner wall forming the air outlet 14 are defined as a first end 141 and a second end 142, where the extension direction of the guide wall 124 connecting the first end 141 to the second end 142 satisfies the polar coordinate equation of the Archimedean spiral, and the equation is that D1=a1+b1θ. That is to say, the first end 141 may be approximated as the starting point of the Archimedean spiral, and the second end 142 may be approximated as the end point of the Archimedean spiral, that is, the inner wall of the dust removal housing 12 increases equidistantly from the first end 141 along the preset direction of rotation 103. Further, the distance from the central axis 102 to the first end 141 is greater than or equal to 40 mm and less than or equal to 60 mm, and the corresponding increase of D1 in unit angle of the inner wall along the preset direction of rotation 103 is greater than 1.3 mm and less than 1.8 mm, that is, a1 is greater than or equal to 40 mm and less than or equal to 60 mm, and b1 is greater than 1.3 mm and less than 1.8 mm. It is to be noted that the width of the preceding air outlet 14 may be referred to as the distance L between the first end 141 and the second end 142. Further, along the direction of the plane of rotation P, the distance D between the fixing member 123 and the central axis 102 is greater than a1+b1θ. That is to say, the fixing member 123 is disposed on the outer side of the guide channel 13 surrounded by the polar coordinate equation of the Archimedean spiral. That is, the installation position for installation and fixation is disposed on the outer side of the guide channel 13. In this manner, the following case can be avoided: the installation position affects the extension direction of the guide wall 124 and thus affects the airflow guide.

As shown in FIG. 13, along the direction of the central axis 102, the distance from the lower sidewall 126 to the upper sidewall 125 is defined as a third distance D3, where the third distance D3 gradually increases along the preset direction of rotation, that is to say, along the preset direction of rotation 103, the distance from the lower sidewall 126 to the upper sidewall 125 gradually increases, that is, the volume of the guide channel 13 gradually increases along the preset direction of rotation 103, that is to say, along the preset direction of rotation 103, the height from the upper sidewall 125 to the lower sidewall 126 gradually increases. In this manner, the dust suction resistance when the dust removal airflow circulates along the guide channel 13 can be reduced, the dust suction performance can be improved, the energy consumption of the sander 100 during operation can be reduced, and the working time of the sander 100 can be extended. It is to be noted that the gradual increase here refers to an increase according to a certain rule, which may be a linear rule or a nonlinear rule.

The upper sidewall 125 includes at least one connecting section 129 that satisfies an Archimedean spiral direction, that is to say, the upper sidewall may be formed by connecting multiple connecting sections 129 that satisfy different rules, where the different rules may be linear rules or nonlinear rules, or the multiple structural sections 127 may include both the linear rules and nonlinear rules. Further, to facilitate design and manufacturing, the upper sidewall 125 extends in the form of an Archimedean spiral, the extension direction satisfies the Archimedean spiral equation, that is, D3=a3+b3θ, the first end 141 may be approximated as the starting point of the Archimedean spiral, that is, the upper sidewall 125 extends upward from the first end 141, and the lower sidewall 126 is approximated as a plane perpendicular to the central axis 102. Further, the distance from the upper sidewall 125 to the lower sidewall 126 at the first end 141 is greater than or equal to 6 mm and less than or equal to 10 mm, and the corresponding increase of the distance from the upper sidewall 125 to the lower sidewall 126 in unit angle along the preset direction of rotation 103 is greater than 0.5 mm and less than 2 mm, that is, a3 is greater than or equal to 6 mm and less than or equal to 10 mm, and b3 is greater than 0.5 mm and less than 2 mm. In this example, the inner wall of a dust removal channel 13 gradually extends outward from the first end 141, and the upper sidewall 125 gradually extends upward from the first end 141. As another feasible example, the upper sidewall 125 gradually extends upward from the first end 141 so that the volume of the dust removal channel 13 gradually increases, and the dust suction resistance of the dust removal airflow in the dust removal channel 13 is reduced, thereby improving the dust suction performance.

When the sander 100 is in a load-free state, the working duration of the sander 100 when the battery pack consumes 10 WH of energy is defined as the functional time T of the sander 100, and the product of the load-free rotational speed N of the electric motor 51 and the functional time T of the sander 100 is greater than or equal to 63000 rpm·min and less than or equal to 120000 rpm·min. In an example, the product of the load-free rotational speed N of the electric motor 51 and the functional time T of the sander 100 is greater than or equal to 70000 rpm·min and less than or equal to 115000 rpm·min. In other examples, the product of the load-free rotational speed N of the electric motor 51 and the functional time T of the sander 100 is greater than or equal to 77000 rpm·min and less than or equal to 110000 rpm·min. In this example, the functional time T of the sander 100 is greater than or equal to 7 min and less than or equal to 11 min.

As shown in FIGS. 5 and 6, the sander 100 further includes a counterweight 80 for achieving the mass balance and torque balance of the base plate. Along the direction of the central axis 102, the counterweight 80 is located between the centrifugal fan 15 and the base plate, and the counterweight 80 and the eccentric element 60 are detachably and fixedly connected, that is to say, the eccentric element 60 and the counterweight 80 move synchronously, and the counterweight 80 can rotate about the axis with the eccentric element 60. The counterweight 80 and the centrifugal fan 15 are two separate components, and the counterweight 80 is disposed on the lower side of the centrifugal fan 15. It may also be understood as that the centroid of the counterweight 80 is close to the base plate so that the distance from the centroid of the counterweight 80 to the base plate can be reduced, the torque between the counterweight 80 and the base plate can be reduced, and the weight of the counterweight 80 for balancing the torque can be reduced. It may also be understood as that no additional weight is required to balance the torque so that the following case can be avoided: the weight of the counterweight 80 is added to balance other weights. In other words, the torque can be counteracted simply through the configuration of other very light weights, and thus only an additional weight having the same weight as the other weights needs to be configured on the counterweight 80. Therefore, it can be seen that through the preceding arrangement, the weight of the counterweight 80 can be greatly reduced, thereby reducing the weight of the sander 100, facilitating user operation, reducing the weight of the whole machine, reducing the fatigue of the user, and reducing the energy consumption of the sander 100.

In this example, the eccentric element 60 is integrally formed with the centrifugal fan 15, that is, the centrifugal fan 15 is formed with the eccentric element 60. The centrifugal fan 15 is mounted on the motor shaft 52 and can be driven by the motor shaft 52 to rotate. Of course, in other words, the centrifugal fan 15 is the eccentric element 60. Specifically, the centrifugal fan 15 is made of a material with a density less than 6.5 g/cm³. Since the weight is proportional to the density, the smaller the density, the smaller the weight of the centrifugal fan 15, that is, the weight of the centrifugal fan 15 is effectively reduced, thereby reducing the weight of the sander 100. Preferably, when the centrifugal fan 15 is made of a material with a density greater than or equal to 1 g/cm³and less than or equal to 3 g/cm³, the weight of the centrifugal fan 15 can be reduced while structural strength is satisfied. Furthermore, the centrifugal fan 15 may be made of aluminum so that costs are saved while the weight of the centrifugal fan 15 is reduced.

It is to be noted that when the electric motor 51 drives the centrifugal fan 15 to rotate, the centrifugal fan 15 generates a moment of inertia, that is to say, when the centrifugal fan 15 rotates, a force of constraint is formed to keep the centrifugal fan 15 rotating about the motor axis 101. The force of constraint restricts the sander 100 to rotate along the up and down direction when the sander 100 tends to move in a certain direction that intersects with the up and down direction. That is to say, the user applies a force to the sander 100 to make the sander 100 move along a certain direction that intersects with the up and down direction, the force of constraint makes the sander 100 tend to move in the opposite direction of the movement of the sander 100, requiring the user to apply a larger force to overcome the force of constraint and causing inconvenience in operation, and operating like this for a long time easily causes fatigue to the user and affects the working efficiency. The moment of inertia is proportional to the weight of the centrifugal fan 15. The greater the weight of the centrifugal fan 15, the greater the moment of inertia and the greater an effect on the user. Therefore, through the preceding arrangement, the moment of inertia can be reduced, thereby improving user experience.

Further, the range of the product of the weight of the centrifugal fan 15 and the square of the outer diameter of the centrifugal fan 15 is greater than or equal to 3000 g·mm²and less than or equal to 10000 g·mm². The outer diameter refers to the diameter of an outer edge 159 of the centrifugal fan 15. The range of the product of the weight of the centrifugal fan 15 and the square of the outer diameter of the centrifugal fan 15 is set within the preceding range so that the moment of inertia generated when the centrifugal fan 15 rotates can be effectively reduced, the effect of the force of constraint during the operation of the user can be reduced, and thus the working efficiency can be improved.

Furthermore, the total weight of the centrifugal fan 15 and the electric motor 51 is less than or equal to 400 g. In the internal structure of the sander 100, the electric motor 51 and the centrifugal fan 15 are much heavier than other components, that is to say, the electric motor 51 and the centrifugal fan 15 mainly contribute to the weight of the sander 100. The structures and positions of the counterweight 80 and the centrifugal fan 15 are configured such that the weight of the centrifugal fan 15 is greatly reduced, a lighter sander 100 with a smaller moment of inertia is obtained, the energy consumption of the sander 100 is reduced, and the working duration of the sander 100 is extended. In some examples, the weight of the centrifugal fan 15 is less than or equal to 100 g. In some other examples, the weight of the centrifugal fan 15 is less than or equal to 80 g. In other examples, the weight of the centrifugal fan 15 is less than or equal to 60 g.

As shown in FIGS. 9 to 12, the centrifugal fan 15 is specifically of a backward-inclined type. The centrifugal fan 15 includes a bottom plate 151 and multiple fan blade portions 152 basically perpendicular to the surface of the bottom plate 151. Along the direction of the central axis 102, the fan blade portions 152 are disposed below the bottom plate 151 and near the base plate. The bottom plate 151 is rotatable about the central axis 102, the bottom plate 151 is connected to the motor shaft 52 of the electric motor 51, the motor shaft 52 can drive the bottom plate 151 to rotate, and the multiple fan blade portions 152 are evenly distributed around the central axis 102. Further, the fan blade portions 152 extend outward from the central axis 102, and along the direction of the central axis 102, the fan blade portions 152 extend from the bottom plate 151 toward the base plate. The multiple fan blade portions 152 are fixedly connected to or integrally formed with the bottom plate 151. In this example, the multiple fan blade portions 152 and the bottom plate 151 are integrally formed into one part. The fan blade portion 152 extends along a curve, where the extension direction of the curve is opposite to the preset direction of rotation 103 of the centrifugal fan 15, that is, the fan blade portion 152 extends along a second direction opposite to the first direction. It is to be noted that the centrifugal fan 15 includes at least three fan blade portions 152.

Each fan blade portion 152 has an inner concave surface that is concave toward the inside of the fan blade portion 152 and an outer convex surface that protrudes toward the outside of the fan blade portion 152. Each fan blade portion 152 has a first fan blade surface 153 and a second fan blade surface 154. The first fan blade surface 153 corresponds to the outer convex surface, and the second fan blade surface 154 corresponds to the inner concave surface. The first fan blade surface 153 and the second fan blade surface 154 are basically perpendicular to the plane of rotation P. In the preset direction of rotation 103, the first fan blade surface 153 is disposed on the front side of the second fan blade surface 154, and the first fan blade surface 153 and the second fan blade surface 154 form a front edge 155 and a rear edge 156 that are opposite. Along the direction of the plane of rotation P, the front edge 155 is away from the central axis 102 relative to the rear edge 156, that is, the rear edge 156 is close to the central axis. The distance from the front edge 155 to the central axis 102 is equal to the distance from the outer edge 159 of the base plate to the central axis 102. In this example, it is to be understood that the front edge 155 is in at least partial contact with the outer edge 159 of the bottom plate 151. It is to be noted here that the equality mentioned here is not strictly limited to the case where the distance from the front edge 155 to the central axis 102 is completely equal to the distance from the outer edge 159 of the bottom plate 151 to the central axis, but as long as the error is within the allowable range, it is to be understood that the distance from the front edge 155 to the central axis 102 is equal to the distance from the outer edge 159 of the base plate to the central axis 102. Of course, in other examples, the front edge 155 is not limited to be in contact with the outer edge 159 of the bottom plate 151, and the front edge 155 may not be in contact with the outer edge 159 of the bottom plate 151, that is, the distance from the front edge 155 to the central axis 102 is less than the distance from the outer edge 159 of the base plate to the central axis 102. Of course, in other examples, the distance from the front edge 155 to the central axis 102 is greater than the distance from the outer edge 159 of the bottom plate 151 to the central axis 102, that is, along the axial direction of the bottom plate 151, the fan blade portions 152 protrude from the bottom plate 151.

To further elaborate on the specific structure of the centrifugal fan 15, it is defined here that a coordinate system is established with a certain point on the central axis 102 as the origin, with a direction of a line between the central axis 102 and the axis as the X-axis, and with a direction perpendicular to the direction of the line between the central axis 102 and the axis as the Y-axis, a projection of the first fan blade surface 153 of the fan blade portion 152 on a plane formed by the X-axis and the Y-axis is defined as a first projection line 157, a projection of the second fan blade surface 154 of the fan blade portion 152 on the plane formed by the X-axis and the Y-axis is defined as a second projection line 158, and the first projection line 157 and the second projection line 158 are both arc lines in the plane formed by the X-axis and the Y-axis. Specifically, the first projection line 157 may be a smooth arc section or may be formed by connecting several smooth arc sections, and the curved transition between the arc sections is relatively uniform. Similarly, the second projection line 158 may be a smooth arc section or may be formed by connecting several smooth arc sections, where the arc sections are smoothly connected. It is to be noted that the curvature of the first projection line 157 and the curvature of the second projection line 158 are not limited, that is to say, the first projection line 157 and the second projection line 158 may be formed in the same manner or different manners. Through the preceding arrangement, the curved transition between the first fan blade surface 153 and the second fan blade surface 154 is relatively uniform and smooth overall; during the rotation of the bottom plate 151, the resistance encountered by the dust removal airflow across the fan blade portions 152 can be greatly reduced, the air output of the rotating centrifugal fan 15 can be increased, and the noise during operation can be reduced.

A tangent at a position of the first projection line 157 farthest from the central axis 102 is defined as a first tangent line 1571, and a tangent line at an intersection of the outer edge 159 of the bottom plate 151 and the first projection line 157 is defined as a second tangent line 1581. The included angle between the first tangent line 1571 and the second tangent line 1581 is greater than or equal to 20 degrees and less than or equal to 45 degrees. The included angle between the first tangent line 1571 and the second tangent line 1581 is set within the preceding range so that the air output and noise suppression effect of the centrifugal fan 15 can be significantly optimized. That is to say, the included angle is set within the preceding range so that the dust collection effect of the sander 100 can be further optimized, and the noise can be reduced, thereby improving the user experience. Further, the included angle α between the first tangent line 1571 and the second tangent line 1581 is greater than or equal to 30 degrees and less than or equal to 40 degrees, thereby making the preceding effect better. In the plane formed by the X-axis and the Y-axis, an endpoint of the first projection line 157 near the outer edge 159 of the bottom plate 151 is defined as A, and an endpoint of the first projection line 157 near the central axis 102 is defined as B. Similarly, an endpoint of the second projection line 158 near the outer edge 159 of the bottom plate 151 is defined as C, and an endpoint of the second projection line 158 near the central axis 102 is defined as D. In the present application, the first projection line 157 and the second projection line 158 are basically parallel, that is to say, the distance L1 between the endpoint A and the endpoint B of the first projection line 157 is basically the same as the distance L2 between the endpoint C and the endpoint D of the second projection line 158. The ratio of the radius of the centrifugal fan 15 to the distance L1 between the endpoint A and the endpoint B of the first projection line 157 is greater than or equal to 4 and less than or equal to 7.5. The ratio is set within the preceding range so that while the dust suction effect of the centrifugal fan 15 is satisfied, the weight of the fan can be reduced, thereby further reducing the energy consumption of the whole machine and extending the working duration of the sander 100. Further, if the ratio of the radius of the centrifugal fan 15 to the distance between the endpoint A and the endpoint B of the first projection line 157 is greater than or equal to 4.5 and less than or equal to 6.5, the effect is better. The distance L1 between the endpoint A and the endpoint B of the first projection line 157 is greater than or equal to 5 mm and less than or equal to 11 mm.

As shown in FIGS. 14 to 20, the second example of the sander is described. The second example is described in detail below.

As shown in FIGS. 14 to 20, a sander 200 includes a housing 210, a base plate assembly 220, a drive assembly 230, a main switch assembly 240, a dust collection device 251, and an energy source 260. The energy source 260 is used for supplying energy to the sander 200. The energy source 260 may be alternating current power or direct current power such as the battery pack or another portable mobile power supply. The dust collection device 251 may be a dust collection bag or a dust collection box; or the sander 200 may be connected to a vacuum cleaner, and the vacuum cleaner serves as the dust collection device 251. In this example, the case where the dust collection device 251 is the dust collection box is used as an example so that the dust collection device 251 is in the shape of a box, thereby further enhancing the integrity between the dust collection device 251 and the housing 210.

The dust collection device 251 may be detachably mounted onto the housing 210 so that it is convenient to dump the dust in the dust collection device 251. The dust collection device 251 has an assembly state in which the dust collection device 251 is assembled with the housing 210 and a disassembly state in which the dust collection device 251 is separated from the housing 210. When the dust collection device 251 is in the assembly state, the housing 210 and the dust collection device 251 together form the outer shape of the sander 200 so that the integrity is strong, and it is convenient for usage, storage, and transportation. In order that the dust collection device 251 and the housing 210 are integrated, the dust collection device 251 may be arc-shaped such that when the dust collection device 251 is in the assembly state, the top surface, the bottom surface, and the inner side surface of the dust collection device 251 basically fit the housing 210. An approximately arc-shaped polyline shape formed by splicing multiple straight lines is also considered to be the same as the technical concept of the present application and is also covered by the scope of the present application.

The housing 210 and/or the dust collection device 251 are formed with a grip 211 for the user to hold. The main switch assembly 240 is disposed on the front side of the housing 210 and above the grip 211 so that the user can relatively conveniently trigger the main switch assembly 240 when holding the grip 211. An accommodation portion is formed on the rear side of the housing 210 and used for mounting the energy source 260 such as the battery pack.

The base plate assembly 220 is disposed at the bottom of the housing 210, and the drive assembly 230 is disposed in the housing 210. The base plate assembly 220 includes a base plate 223 connected to a work accessory; the drive assembly 230 includes an electric motor 231, and the electric motor 231 is used for driving the base plate 223 so that the base plate 223 and the work accessory swing relative to the housing 210. The base plate 223 includes an upper surface and a lower surface that are opposite. The lower surface is used for mounting the work accessory. The work accessory may be the functional element such as the sandpaper. When the base plate 223 moves eccentrically, the surface of a workpiece to be sanded can be continuously rubbed with the sandpaper, thereby implementing the function of sanding and polishing the workpiece to be sanded.

The sander 200 further includes a dust channel 212. The dust channel 212 is disposed in the housing 210. Dust is collected from the base plate 223, flows into the dust channel 212, and then flows into the dust collection device 251 through the dust channel 212. Specifically, the base plate 223 is provided with a through hole penetrating the upper surface and the lower surface, and dust enters the dust channel 212 through the through hole.

The electric motor 231 includes a motor shaft for outputting power, and the motor shaft rotates about a motor axis. In this example, the motor axis extends basically along the up and down direction. The sander 200 further includes an airflow element 234 drivable by the electric motor 231. The airflow element 234 is drivable by the electric motor 231 to rotate about the central axis. When rotating, the airflow element 234 can generate the airflow, and the airflow drives dust such that the dust is collected from the base plate 223, flows into the dust channel 212, and then flows into the dust collection device 251 through the dust channel 212.

The housing 210 is further provided with a control panel 232 and a speed regulation assembly 233. The control panel 232 is electrically connected to the electric motor 231. The speed regulation assembly 233 is electrically connected to the control panel 232. The speed regulation assembly 233 can control the rotational speed of the electric motor 231. The speed regulation assembly 233 can be controlled by a speed regulation button on the housing 210.

The dust channel 212 includes a dust inlet 221 and a dust outlet 222. The dust channel 212 has an upper sidewall and a lower sidewall along the up and down direction, where the distance from the upper sidewall to the lower sidewall gradually increases along a preset direction of rotation 205. It is to be understood that the sucked dust flows from the dust inlet 221 to the dust outlet 222. In the vertical direction, the dust outlet 222 is higher than the dust inlet 221; the base plate 223 extends in a first plane, and the projection of the dust channel 212 on the first plane is basically arc-shaped so that the resistance to dust flow is reduced and smooth dust collection is achieved. In addition, since the resistance to dust collection is reduced, the energy consumption of the sander is reduced. It is to be noted that the arc shape involved in the present application may be an arc along the internal contour of the housing or may be a curve or another non-circular arc such as an involute.

In this example, when the sander 200 is in the load-free state, the working duration of the sander 200 when the battery pack consumes 10 WH of energy is defined as the functional time T of the sander 200, and the product of the load-free rotational speed N of the electric motor 231 and the functional time T of the sander 200 is greater than or equal to 63000 rpm·min and less than or equal to 120000 rpm·min. In an example, the product of the load-free rotational speed N of the electric motor 231 and the functional time T of the sander 200 is greater than or equal to 70000 rpm·min and less than or equal to 115000 rpm·min. In other examples, the product of the load-free rotational speed N of the electric motor 231 and the functional time T of the sander 200 is greater than or equal to 77000 rpm·min and less than or equal to 110000 rpm·min. In this example, the functional time T of the sander 200 is greater than or equal to 7 min and less than or equal to 11 min.

For the dust channel 212, the smaller the height difference between the dust outlet 222 and the dust inlet 221, the smaller the resistance to air flow. However, the dust outlet 222 connects with the dust collection device 251; the higher the dust outlet 222 is, the less likely the dust collection device 251 is blocked by dust. The height difference H1 in the vertical direction between the dust outlet 222 and the dust inlet 221 is greater than or equal to 9 mm and less than or equal to 41 mm. In some examples, the height difference H1 in the vertical direction between the dust outlet 222 and the dust inlet 221 is greater than or equal to 15 mm and less than or equal to 30 mm. In some examples, the height difference H1 in the vertical direction between the dust outlet 222 and the dust inlet 221 is 27 mm.

The included angle formed between a line between the dust inlet 221 and the center point of the base plate 223 and a line between the dust outlet 222 and the center point of the base plate 223 is a first angle β, and the first angle β is greater than or equal to 60 degrees and less than or equal to 120 degrees so that the resistance of the airflow in the dust channel 212 is reduced. In some examples, the first angle β is greater than or equal to 80 degrees and less than or equal to 100 degrees. In some examples, the first angle β is equal to 60 degrees, 70 degrees, 80 degrees, 90 degrees, 100 degrees, 110 degrees, or 120 degrees. In an example, the dust inlet 221 and the dust outlet 222 of the dust channel 212 are both located in the housing 210. In an example, the projection of the dust outlet 222 of the dust channel 212 on the first plane does not extend beyond the boundary range of the base plate 223. In an example, the base plate 223 is basically rectangular, and the center point of the base plate 223 is the center point of the rectangular surface.

In some examples, the dust channel 212 extends in a spiral shape between the dust inlet 221 and the dust outlet 222 so that the dust channel 212 rises gently and the airflow resistance is reduced. In some examples, the dust channel 212 extends in a straight line between the dust inlet 221 and the dust outlet 222.

The projection of the dust channel 212 on the first plane is a first projection, and the first projection is completely located within the boundary of the base plate 223 so that the structure is compact and the center of gravity is stable. The projection of the dust collection device 251 on the first plane is a second projection, and the second projection is completely located within the boundary of the base plate 223 so that the structure is compact and the center of gravity is stable. The first projection may overlap the second projection. The area of the second projection is greater than half of the area of the base plate 223.

A first electrostatic conductive assembly is disposed on the dust collection device 251 and used for conducting static electricity from the dust collection device. The first electrostatic conductive assembly may be a metal sheet such as a copper sheet.

The sander 200 further includes a second electrostatic conductive assembly. The second electrostatic conductive assembly includes a first conductive member and a second conductive member. Two ends of the first conductive member are separately connected to the dust channel 212 and the stator core of the electric motor 231. Two ends of the second conductive member are separately connected to the stator core and the housing 210. Since the human hand holds the housing 210, the static electricity on the dust channel 212 is conducted by the human hand through the second electrostatic conductive assembly.

As shown in FIGS. 21 and 22, the dust collection device 251 has a dust collection cavity 252, an air inlet 253, and an air outlet 254, where the air inlet 253 and the air outlet 254 connect with the dust collection cavity 252. The air inlet 253 connects with the dust outlet 222 of the dust channel 212. Therefore, the dust can enter the dust collection device 251 from the dust channel 212, and the air outlet 254 connects with the outside; after the airflow carrying dust enters the dust collection device 251, the dust falls into the dust collection cavity 252 under the action of the gravity, and the airflow flows out from the air outlet 254.

The air inlet 253 connects with the dust outlet 222 of the dust channel 212. The area of the air inlet 253 is less than or equal to 400 mm², ensuring sufficient intake air volume under the premise of fully utilizing the space. In some examples, the area of the air inlet 253 is less than or equal to 350 mm². In some examples, the area of the air inlet 253 is less than or equal to 300 mm². In some examples, the area of the air inlet 253 is equal to 250 mm², 260 mm², or 270 mm².

A filter 257 is disposed at the air outlet 254 of the dust collection device 251. If a small amount of dust flows out of the air outlet 254 with the airflow, the filter 257 can filter the dust to prevent the dust from overflowing. The filter 257 includes a holder 258 and filter paper 259. The filter paper 259 is mounted on the holder 258. The holder 258 is detachably connected to the air outlet 254. The filter paper 259 is supported by the holder 258. The holder 258 is easy to mount and disassemble. When the filter paper 259 is replaced, the holder 258 may be disassembled. After the filter paper 259 is replaced, the holder 258 is mounted again. The holder 258 may engage with the dust collection device 251 in a snap-fit manner.

As shown in FIG. 23, one air outlet 254 is provided and located at the top of the dust collection device 251. As shown in FIG. 24, in the vertical direction, the bottom edge of the air inlet 253 is higher than the bottom surface of the dust collection cavity 252, and the height difference H2 between the bottom edge of the air inlet 253 and the bottom surface of the dust collection cavity 252 is greater than or equal to 5 mm and less than or equal to 20 mm so that the dust in the dust collection cavity 252 is prevented from overflowing from the air inlet 253, the air inlet 253 is prevented from being blocked, the dust collection cavity 252 has a certain space, and the dust collection amount is improved.

As shown in FIGS. 25 and 26, at least two air outlets 254 are provided so that air permeability and exhaust air volume are increased, and the dust collection is smoother. The air outlets 254 may be disposed on the top or side surface of the dust collection device 251. Specifically, the air outlet 254 is located on a side of the dust collection device 251 facing the housing 210, that is, the air outlet 254 is disposed on the inner side surface of the dust collection device 251 so that the outer surface of the dust collection device 251 is flat.

Each air outlet 254 is provided with the filter 257, and the filter 257 can filter the dust and prevent the dust from overflowing.

In a layout where the air outlet 254 is located on the side of the dust collection device 251 facing the housing 210, to facilitate air output, a gap is formed between the dust collection device 251 and the housing 210, and the gap connects the air outlet 254 with the outside. As shown in FIG. 15, the housing 210 includes a first adapting surface 215, and the inner side surface of the dust collection device 251 is a second adapting surface 216. When the dust collection device 251 is assembled with the housing 210, a gap is formed between the first adapting surface 215 and the second adapting surface 216, thereby facilitating air output at the air outlet 254. The gap has a dimension of 1 mm to 3 mm, preferably, 2 mm.

As shown in FIG. 15, the housing 210 includes a mounting plate 213. The mounting plate 213 has a first mounting surface 231. The dust collection device 251 is detachably connected to the first mounting surface 231. The first mounting surface 231 is a mirror-finished surface so that the friction during assembly is reduced, thereby facilitating the disassembly and assembly of the dust collection device 251.

The dust collection device 251 may engage with the housing 210 in a snap-fit manner, specifically, through a ball snap catch 214. The ball snap catch 214 is disposed on the first mounting surface 231. During installation, the dust collection device 251 is pushed to the housing 210 so that the dust collection device 251 slides along the first mounting surface 231 to engage with the ball snap catch 214 in a snap-fit manner. Since the first mounting surface 231 is the mirror-finished surface, the friction during assembly is reduced.

The mounting plate 213 further includes a second mounting surface 232. The second mounting surface 232 is located on the outer circumference of the first mounting surface 231 and is lower than the first mounting surface 231. The second mounting surface 232 has a rougher surface than the first mounting surface 231. The dust collection device 251 abuts against the second mounting surface 232 so that the contact area and friction between the dust collection device 251 and the housing 210 are increased, and the connection is stable.

As shown in FIGS. 27 to 31, in an example, the dust collection device 251 has the dust collection cavity 252, a cyclone dust collection assembly 256 is disposed in the dust collection cavity 252, the cyclone dust collection assembly 256 has the air inlet 253, a dust exhaust outlet 250, and the air outlet 254, the air inlet 253 connects with the dust outlet 222, the dust exhaust outlet 250 connects with the dust collection cavity 252, and the air outlet 254 connects with the outside. Due to the arrangement of the cyclone dust collection assembly 256, the air inlet 253 does not need to be higher than the bottom surface of the dust collection cavity 252, and the dust in the dust collection cavity 252 does not overflow from the air inlet 253.

The working principle of the cyclone dust collection assembly 256 is conventional technology, and the details are not repeated here. The airflow carrying dust rises after entering from the air inlet 253. Under the action of the cyclone dust collection assembly 256, the dust falls from the dust exhaust outlet 250, and the airflow is discharged from the air outlet 254. The air outlet 254 may be disposed on the outer sidewall of the dust collection device 251, so the top of the dust collection device 251 does not need to be opened and can be sealed.

As shown in FIGS. 32 and 33, the sander 200 further includes an illumination device 270. The housing 210 includes a housing top 202, a housing bottom 203, and a shrinkage portion 204 disposed between the housing top 202 and the housing bottom 203. The illumination device 270 includes a light-emitting portion 271. The light-emitting portion 271 is disposed on the housing 210 and located above the shrinkage portion 204. The base plate 223 is within the illumination range of the light-emitting portion 271. The position of the light-emitting portion 271 is such that the base plate 223 is within the illumination range of the light-emitting portion 271. Since a sanding member on the base plate 223 sands a member to be sanded, during work, the work region is within the illumination range of the light-emitting portion 271, which is convenient for an operator to observe, thereby improving the user experience.

In some examples, the light-emitting portion 271 is disposed at the junction of the shrinkage portion 204 and the housing top 202. It is to be understood that the light-emitting portion 271 emits light downward or obliquely downward to illuminate the region where the base plate 223 is located.

The illumination device 270 is detachably disposed relative to the housing 210, thereby facilitating maintenance. The light-emitting portion 271 and the housing 210 may be connected in a screw connection manner, a snap-fit manner, or a magnetic attraction connection manner.

In some examples, the battery pack of the sander 200 supplies electrical energy to the illumination device 270. In some examples, the sander 200 further includes an illumination power supply that supplies power to the illumination device 270, and the illumination power supply is a power supply component independent of the battery pack. Optionally, the illumination power supply may be a battery, a storage battery, or the like that is detachably connected to the sander 200. In some examples, the sander 200 further includes a self-powered module. The self-powered module is a component that can generate power through sunlight. The module that generates power through sunlight is an existing component, so the working principle and detailed structure are not described in detail.

The light-emitting portion 271 is one or a combination of at least two of a point light source, an area light source, and a light-emitting diode (LED) light source. The light-emitting portion 271 may be annular or rectangular, so as to increase the luminous area.

One light-emitting portion 271 may be provided, or multiple light-emitting portions 271 may be provided. When multiple light-emitting portions 271 are provided, the light-emitting portions 271 may be located at different positions, and the light-emitting portions 271 may be turned on or off simultaneously or independently. In some examples, the illumination device 270 includes at least two light-emitting portions 271. The at least two light-emitting portions 271 may be turned on separately. Optionally, one of the light-emitting portions 271 may be set to a low-beam mode, and one of the light-emitting portions 271 may be set to a high-beam mode, so as to satisfy different usage requirements. Of course, the two light-emitting portions 271 may be turned on simultaneously so that the illumination device 270 has a higher illumination intensity and a larger illumination range. It is to be noted that the low-beam mode and the high-beam mode are collectively referred to as light emission modes of the light-emitting portion 271. Optionally, different light-emitting portions 271 may be disposed at different positions of the sander 200 so that while illuminating the base plate 223 of the sander 200, the illumination device 270 can illuminate the front, sides, and rear of the sander 200, thereby preventing the user from bumping due to unclear visibility of the surrounding environment.

The illumination device 270 can be turned on when the electric motor 231 is turned on, and the illumination device 270 can be turned off in a preset time after the electric motor 231 stops rotating. The on and off of the illumination device 270 and the electric motor 231 are linked so that the illumination device 270 can be turned on and off intelligently, thereby improving the user experience. Optionally, the preset time may be 3 s, 5 s, 7 s, or the like and is not specifically limited here. In some examples, the user may configure the illumination device 270 to select the appropriate preset time.

The light-emitting portion 271 can emit light of at least two colors. Optionally, the light-emitting portion 271 can emit white light, which has better brightness and is suitable for use in normal weather. The light-emitting portion 271 can emit yellow light, which has strong penetrability and is more suitable for use in foggy days. Optionally, the light-emitting portion 271 can emit red light. During working in complex construction conditions, turning on the red light can serve as a warning to the outside. In other examples, the colors emitted by the light-emitting portion 271 are not limited to the preceding colors. Optionally, the illumination device 270 may include at least two light-emitting portions 271, and each light-emitting portion 271 correspondingly emits light of one color.

In some examples, the illumination device 270 is configured to be capable of adjusting the light colors of the light-emitting portions 271 according to ambient brightness. The illumination device 270 may be provided with a light sensor. When the light sensor recognizes that the ambient brightness decreases to a first threshold, the light-emitting portion 271 switches from a first color to a second color.

The illumination device 270 is configured to be capable of adjusting the brightness of the light-emitting portions 271 according to the ambient brightness. In some examples, the illumination device 270 may be provided with the light sensor. When the light sensor recognizes that the ambient brightness decreases to the first threshold, the light-emitting portions 271 automatically light up. In some examples, when the light sensor recognizes that the ambient brightness increases to a second threshold, the brightness of the light-emitting portions 271 is automatically adjusted to darker.

In some examples, the light-emitting portions 271 have at least two brightnesses. When the user presses the button for the first time, the light-emitting portions 271 emit light of the first brightness. When the user presses the button for the second time, the light-emitting portions 271 emit light of the second brightness. When the user presses the button for the third time, the light-emitting portions 271 are turned off.

The illumination device 270 can perform at least one of a safety indication, a fault indication, a battery pack power reminder, or a projected image. Optionally, the light-emitting portions 271 can flash at different frequencies and indicate the safety indication, the fault indication, and the power reminder at different strobe frequencies. It is to be understood that the light-emitting portions 271 can emit light of different colors to separately indicate the safety indication, the fault indication, and the power reminder. Optionally, the light-emitting portions 271 can project an image, and the image may be a brand logo or a model of the product, thereby achieving a certain publicity effect.

The illumination device 270 further includes a switch assembly, where the switch assembly can turn on and off the light-emitting portions 271, and/or adjust the brightness of the light-emitting portions 271, and/or select emitted colors of the light-emitting portions 271, and/or trigger the light-emitting portions 271 to project an image, and/or select the light emission modes of the light-emitting portions 271. In an example, the maximum distance between the switch assembly and the light-emitting portion 271 is less than or equal to 5 cm so that the length of the cable between the switch assembly and the light-emitting portion 271 can be shortened, and the cables inside the sander 200 are neat and are not easily damaged. The switch assembly may be located above the grip 211 for easy operation.

In some examples, the illumination device 270 is configured to be capable of transmitting control signals to and from a user terminal to adjust luminescence parameters of the light-emitting portions 271. Specifically, the illumination device 270 further includes a communication module. The user may communicate with the communication module through a terminal device such as a mobile phone to control the light-emitting portions 271. Optionally, the communication module may be a Bluetooth module, a Wi-Fi module, or the like. The luminescence parameters include, but are not limited to, turning on and off the light-emitting portions 271, adjusting the brightness of the light-emitting portions 271, selecting the emitted colors of the light-emitting portions 271, triggering the light-emitting portions 271 to project an image, selecting the light emission modes of the light-emitting portions 271, and adjusting the strobe frequencies of the light-emitting portions 271. The user terminal may be a portable terminal such as a tablet or a mobile phone, so as to adjust the luminescence parameters of the light-emitting portions 271 easily.

As shown in FIG. 34, in the case where the sander 200 includes the dust collection device 251, the illumination device 270 includes the light-emitting portions 271, and the light-emitting portions 271 are disposed on the dust collection device 251, so as to make full use of the space of the dust collection device 251. Since the outer circumferential surface of the dust collection device 251 has a larger dimension, the light-emitting portions 271 disposed on the dust collection device 251 are less likely to be blocked. For the specific structure of the dust collection device 251, reference may be made to the relevant content of the preceding dust collection device 251. For the specific structures of the light-emitting portions 271, reference may be made to the relevant content of the preceding light-emitting portions 271.

In some examples, the light-emitting portions 271 are arranged around the circumferential direction of the dust collection device 251 so that the light has a larger coverage area, the illumination range is increased, and the light uniformity is ensured.

In some examples, the light-emitting portions 271 are disposed inside and/or outside the dust collection device 251. The light-emitting portions 271 may be disposed on the outer circumferential surface of the dust collection device 251, on the inner circumferential surface of the dust collection device 251, or on both the outer circumferential surface and the inner circumferential surface of the dust collection device 251.

In some examples, some light-emitting portions 271 are disposed on the dust collection device 251, and some light-emitting portions 271 are disposed on the housing 210.

In some examples, the dust collection device 251 is detachably connected to the housing 210, and the dust collection device 251 has the assembly state in which the dust collection device 251 is assembled with the housing 210. When the dust collection device 251 is in the assembly state, the illumination device 270 is turned on. The state of the dust collection device 251 is linked to the on and off of the illumination device 270 so that the illumination device 270 can be turned on intelligently, thereby improving the user experience. The dust collection device 251 has the disassembly state in which the dust collection device 251 is separated from the housing 210. In some examples, when the dust collection device 251 is in the disassembly state, the illumination device 270 is turned off.

The above illustrates and describes the basic principles, main features, and advantages of the present invention. It is to be understood by those skilled in the art that the preceding examples do not limit the present invention in any form, and technical solutions obtained by means of equivalent substitution or equivalent transformation fall within the scope of the present invention.

Number	Date	Country	Kind
202111192829.2	Oct 2021	CN	national
202311247654.X	Sep 2023	CN	national

	Number	Date	Country
Parent	PCT/CN2022/118810	Sep 2022	WO
Child	18595749		US

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