This application claims the benefit under 35 U.S.C. § 119(a) of Chinese Patent Application No. CN 202010301178.5, filed on Apr. 16, 2020, and Chinese Patent Application No. CN 202110152268.7, filed on Feb. 4, 2021, which are incorporated by reference in their entirety herein.
A nail gun serves as a nailing tool. Existing nail gun products on the market may be classified into mechanical-type nail guns and cylinder-type nail guns according to a mode of principles. The mechanical-type nail guns may be classified into structures such as spring-type nail guns, flywheel-type nail guns, friction pulley-type nail guns according to a mode of energy storage. The cylinder-type nail guns may be classified into single cylinder nail guns or double cylinder nail guns according to the number of cylinders and nail guns which store energy with a positive pressure or nail guns which store energy with a negative pressure according to the mode of energy storage. In the existing art, the cylinder-type nail guns have a complex structure and a relatively large volume and are quite inconvenient for a user to operate. Therefore, how to provide a compact and easy-to-operate cylinder-type nail gun is an urgent technical problem to be solved currently.
In one aspect of the disclosure, a nail gun includes a housing, a power output assembly, a cylinder, a power output assembly, and a firing pin. At least a part of the power output assembly is disposed in the housing, at least a part of the cylinder is disposed in the housing, the firing pin is configured to perform nailing, the firing pin is provided with a first drive teeth capable of being driven, the first drive teeth includes a locking tooth provided with a rotating shaft, the rotating shaft is provided with a roller wheel, and the roller wheel is rotatable about a rotating axis.
In one example, a radius of the roller wheel is greater than or equal to a length of a connecting line between a tooth crest of the locking tooth and an axis center of the rotating shaft.
In one example, the rotating shaft is rotatably connected to the locking tooth, and the roller wheel is fixedly connected to the rotating shaft and capable of rotating with the rotating shaft synchronously.
In one example, the rotating shaft is rotatably connected to the locking tooth, and the roller wheel is rotatably connected to the rotating shaft and capable of rotating with the rotating shaft synchronously.
In one example, the rotating shaft is fixedly connected to the locking tooth, and the roller wheel is rotatably connected to the rotating shaft and capable of rotating about the rotating shaft.
In one example, the power output assembly has a first symmetry plane, the cylinder has a second symmetry plane, and the first symmetry plane is substantially parallel to the second symmetry plane, and a distance between the first symmetry plane and the second symmetry plane is greater than or equal to 0 and less than or equal to 15 mm.
In one example, the power output assembly includes a motor and a gearbox, the motor is configured to output a driving force to the gearbox, the gearbox is provided with a drive shaft capable of driving the firing pin to move, the nail gun further includes a drive member disposed between the firing pin and the drive shaft, the drive member includes second drive teeth for engaging with the first drive teeth of the firing pin, and the second drive teeth extends in an extension plane parallel to or coincident with the first symmetry plane.
In one example, a distance between the extension plane and the first symmetry plane is greater than or equal to 0 and less than or equal to 10 mm.
In one example, a radius of the cylinder is configured to be greater than or equal to 21 mm and less than or equal to 24 mm, and a volume of the cylinder is configured to be greater than or equal to 180 ml and less than or equal to 260 ml.
In one example, the firing pin includes a piston disposed in the cylinder, and a stroke of the piston in the cylinder is greater than or equal to 82 mm and less than or equal to 105 mm.
In one example, the rotating axis is perpendicular an extension direction of the firing pin.
In one example, the roller wheel is disposed on the one of the first drive teeth farthest from the cylinder.
In one example, the nail gun includes two ones of the roller wheel, and the two ones of the roller wheel are respectively arranged on two sides of the locking tooth.
In one example, the nail gun further includes a drive member disposed between the firing pin and the power output assembly, and the drive member includes second drive teeth for engaging with the first drive teeth of the firing pin.
In one example, the drive member further includes a release portion for releasing the firing pin to move towards the cylinder, and the release portion and the second drive teeth are disposed on a circumference of the driving member.
In one aspect of the disclosure, a nail gun includes a housing, a power output assembly, a cylinder, a firing pin, and a drive member. The housing is formed with a first accommodating space and a second accommodating space, at least a part of the power output assembly is disposed in the first accommodating space, at least a part of the cylinder is disposed in the second accommodating space, the firing pin is configured to perform nailing, the drive member is configured to drive the firing pin, the firing pin is provided with a first drive teeth capable of being driven and further provided with a rotating shaft provided with a roller wheel, the roller wheel is capable of rotating about a rotating axis, and the drive member includes a second drive teeth capable of being engaged with the roller wheel.
In one example, the nail gun further includes a connecting base connected to the cylinder, the connecting base is provided with a first through hole through which the firing pin passes and further provided with exhaust ports for discharging gas, and the exhaust ports are distributed around the connecting base.
In one example, the cylinder and the connecting base are connected to each other such that a first space and a second space capable of being divided into by the piston are formed, and the exhaust ports are disposed in the second space.
In one example, a radius of the roller wheel is greater than or equal to a length of a connecting line between a tooth crest of a locking tooth and an axis center of the rotating shaft.
In one example, the drive member is configured to rotate about a axis parallel to the rotating axis, and the rotating axis is perpendicular an extension direction of the firing pin.
A nail gun 100 shown in
As shown in
As shown in
In an implementation, the firing assembly 15 includes a firing pin 151 capable of being driven, the firing pin 151 is formed with first drive teeth 151a capable of being driven, and the drive member 16 is formed with second drive teeth 161 capable of being engaged with the first drive teeth 151a. When the first drive teeth 151a are engaged with the second drive teeth 161 and drive the firing pin 151 to move, air in the cylinder 13 is compressed such that a next nailing cycle is entered. In fact, the drive shaft 123 is formed with first transmission teeth 123a, the drive member 16 is further formed with second transmission teeth 162 to be engaged with the first transmission teeth 123a, and the second transmission teeth 162 can mesh with the first transmission teeth 123a so as to transmit the driving force from the gearbox 122. The first transmission teeth 123a and the second transmission teeth 162 adopt a group of bevel gear structures, so that a transmission direction of the driving force can be changed and the size of the nail gun 100 in the width direction is not increased due to the existence of the drive member 16.
The second drive teeth 161 extend in an extension plane. The extension plane is substantially parallel to or coincident with the first symmetry plane 103 or the second symmetry plane 104. In an implementation, a distance between the extension plane and the first symmetry plane 103 and a distance between the extension plane and the second symmetry plane 104 are greater than or equal to 0 and less than or equal to 10 mm.
In an example, the cylinder may further be configured to be a two-layer cylinder structure composed of an inner-layer cylinder and an outer-layer cylinder. It is to be understood that when the two-layer cylinder is provided, air in the inner-layer cylinder and air in the outer-layer cylinder are in communication. When the firing assembly disposed in the inner-layer cylinder is driven to compress the air or the air does work to drive the firing assembly, the firing assembly has a relatively small contact area with the air in the cylinder so that a change of a pressure value of the air in the cylinder is relatively small. In this manner, the striking force output by the air in the cylinder is relatively stable, which also makes the nail gun provide a better operation experience.
In an implementation, the connecting base 17b is provided with exhaust ports 172b for quickly discharging the air in the second space 135b. The exhaust ports 172b are evenly distributed around a lower end of the connecting base 17b, and when the piston 152b moves to the connecting base 17b, a preset gap is further provided between the piston 152b and the exhaust ports 172b. In some optional implementations, a ratio of an area occupied by the exhaust ports 172b to an area of the piston 152b is greater than or equal to 0.25. In fact, the connecting base 17b is further provided with a buffer 173b. When the piston 152b moves to the connecting base 17b at a high speed, the piston 152b is in contact with the buffer 173b so that part of kinetic energy is counteracted, thereby preventing the piston 152b or the connecting base 17b from being damaged due to direct collision between the piston 152b and the connecting base 17b.
As shown in
Specifically, as shown in
The firing pin 151c is extending along a line 106, the roller wheel 1514 may rotate about a rotating axis 107, and the rotating axis 107 is perpendicular the line 106. The drive member 16c is configured to rotate about an axis 108 parallel to the rotating axis 107.
It is to be understood that the firing pin 151c may also not be provided the locking tooth and merely be provided with a connecting portion for connecting the rotating shaft to the roller wheel, so that the locking of the first drive teeth can also be achieved, and the rolling friction between the roller wheel and the first drive teeth can be achieved. More specifically, the rotating shaft may be provided to be rotatably connected to the connecting portion so that the roller wheel can rotate synchronously with the rotating shaft when the roller wheel is mounted to the rotating shaft. Alternatively, the rotating shaft is fixedly connected to the connecting portion, and the roller wheel is rotatably connected to the rotating shaft and is freely rotatable about the rotating shaft.
The single-layer cylinder 13c may be used as the cylinder 13c. When a radius of the cylinder 13c is configured to be greater than or equal to 21 mm and less than or equal to 24 mm and a volume of the cylinder 13c is configured to be greater than or equal to 180 ml and less than or equal to 260 ml, a stroke of the piston in the cylinder 13c is configured to be greater than or equal to 82 mm and less than or equal to 105 mm. In this manner, the nail gun can be ensured to have a certain striking force, a height of the cylinder 13c in a longitudinal direction is relatively small, and an efficiency of the cylinder 13c can be maintained at an optimal level.
In an example, the cylinder 13c may further be provided with a pressure sensor. The nail gun further includes a detection device and an alarm device. The pressure sensor is electrically connected to the detection device, and the detection device can identify and determine a pressure value monitored by the pressure sensor. The alarm device is electrically connected to the detection device. When the air in the cylinder 13c is compressed to a to-be-fired state, and the pressure sensor detects that the pressure value is transmitted to the detection device and finds that the pressure value is less than a preset value, the detection device outputs an electrical signal to the alarm device to remind the user that the air in the cylinder 13c is in an underpressure state at this time, and the user can stop the machine in time to inflate the cylinder 13c. In an implementation, the alarm device may be provided as a display interface showing that the cylinder 13c is in a low pressure state. In another implementation, the alarm device may also be provided as an alarm to remind the user that the cylinder 13c is in a low pressure state. In fact, the alarm device may be provided as any device with a warning effect or a reminding effect, which is not limited herein. In this implementation, the nail gun is further provided with a stop switch forming an electric connection with the detection device. When the air in the cylinder 13c is under pressure, the detection device outputs an electrical signal to the stop switch, and the stop switch automatically controls the nail gun to be turned off. At this time, the nail gun cannot be started. It is to be understood that when the air in the cylinder 13c is under pressure, the firing assembly 15c cannot output sufficient striking force during the air doing work, resulting in a stronger collision between the firing pin 151c and the drive teeth of the drive wheel, and thus resulting in a faster damage of the firing pin 151c or the transmission assembly. The nail gun further includes a Hall switch, and the Hall switch is electrically connected to the detection device. The Hall switch can control a driver circuit to cut off, and when the stop switch fails to sense a stop signal, the Hall switch can effectively sense a signal transmitted from the detection device and control the driver circuit to cut off.
More specifically, the first drive wheel 23 includes first transmission teeth and third drive teeth 231, and the second drive wheel 24 includes second transmission teeth 241 and fourth drive teeth 242. The third drive teeth 231 mesh with the first drive teeth 221, and the fourth drive teeth 242 mesh with the second drive teeth 222. The gearbox 25 is further connected to or provided with a drive shaft 251, and the drive shaft 251 is provided with third drive teeth 252 which mesh with the first transmission teeth and the second transmission teeth 241 simultaneously, so as to drive the first drive wheel 23 and the second drive wheel 24 to rotate simultaneously, and the first drive wheel 23 and the second drive wheel 24 simultaneously drive the firing pin 22 to move.
More specifically, the gearbox 34 is connected or provided with a drive shaft 341, and the drive shaft 341 drives the first drive wheel 32 and the second drive wheel 33 through a group of external meshing gear assemblies.
As shown in
The power conversion circuit 54 is connected to a battery pack 15 and configured to convert output electric energy of the battery pack into a power supply voltage capable of supplying power to a control unit, the parameter detection unit, the position detection unit, and the like.
The driver circuit 55 is connected between the control unit and the motor and can receive a control signal output by the control unit, and the driver circuit 55 changes a conduction state of the driving circuit 55 to control a rotational speed or a rotational direction of a motor. Optionally, the driver circuit may include one or more switching elements. In one example, as shown in
To rotate the motor, the driver circuit 55 has a plurality of drive states. In a drive state, the windings of the stator of the motor generate a magnetic field, and the control unit is configured to output a corresponding pulse width modulation (PWM) control signal to the switching elements of the driver circuit according to a rotational position of a rotor of the motor or a counter electromotive force to enable the driver circuit to switch the drive state, so that the windings of the stator generate a changed magnetic field to drive the rotor to rotate, and thus the rotation or the phase-changing of the motor is implemented. It is to be noted that any other circuit and control mode capable of driving the motor to rotate or change phase may be used in the present disclosure, and the present disclosure does not limit a circuit structure of the driver circuit and the control of the driver circuit by the control unit.
The parameter detection unit 51 is configured to detect a relevant parameter in operation of the motor 421 during a nailing process of the nail gun. The relevant parameter in the operation of the motor may refer to an operating time T1 of the motor, the number of turns N1 of the motor, an output voltage or current of the motor, or the like.
The control unit 53 may control the change of the operating state of the motor according to the relevant parameter in the operation of the motor detected by the parameter detection unit 51. Optionally, when the relevant parameter is greater than a first parameter threshold, the control unit 53 may reduce drive power of the motor so that the rotational speed of the motor is reduced and a speed at which the firing assembly moves in a direction of the initial position is also reduced. For example, the control unit may reduce a duty cycle of the output PWM signal to reduce the drive power of the motor. Optionally, when the relevant parameter is greater than the first parameter threshold, the control unit 53 may directly stop driving the motor and cause the motor to enter a freewheeling stage. During the freewheeling stage, the firing assembly continues to move in an initial direction by the rotational inertia of the motor, and the movement speed gradually decreases. In one example, the first parameter threshold is half or about half of a corresponding relevant parameter in one nailing cycle. For example, if the corresponding relevant parameter in one nailing cycle is X, the first parameter threshold is 0.5× or 0.6×. In one implementation, the number of turns or the operating time of the motor serves as the relevant parameter in the operation of the motor. If the number of turns of the motor in one nailing cycle is N2, the first parameter threshold is N2/2, and if the operating time of the motor in one nailing cycle is T2, the first parameter threshold is T2/2. In the present application, a principle for selecting the first parameter threshold is described below. When the relevant parameter in the operation of the motor is consistent with the first parameter threshold, the firing pin has fired the nail and is in a process of moving from a firing position to the initial position. In an implementation, when the parameter detection unit detects that the number of turns N1 of the motor is greater than N2/2, the control unit 53 may reduce the drive power of the motor, thereby reducing the speed at which the firing pin moves toward the initial position. In an implementation, when the parameter detection unit detects that the operating time T1 of the motor is greater than T2/2, the control unit 53 may stop driving the motor and cause the motor to slide by inertia to drive the firing pin to continue to move in the direction of the initial position at a lower and lower speed.
Furthermore, during the movement of the firing pin toward the initial position, the position detection unit 52 may detect a movement position of the firing pin, and when the movement position reaches a preset position, the control unit controls the motor to brake so that the firing pin rapidly reduces a movement speed and finally stops at the initial position. That is, after the motor slides by the inertia for a period of time, the firing pin moves to a position close to the initial position, and the control unit controls the rotational speed of the motor to quickly drop to zero and the firing pin to stop at the initial position. Optionally, the firing pin may also stop at a certain position close to the initial position.
Optionally, the position detection unit may include a sensor such as a Hall sensing assembly or an optoelectronic device capable of detecting the movement position of the firing pin in the cylinder.
In one implementation, the position detection unit 52 is the Hall sensing assembly 57 shown in
In one implementation, the position detection unit 52 is the optoelectronic device that can trigger an optoelectronic signal when the firing pin moves to the preset position. When the control unit receives the photoelectric signal, the control unit can determine that the firing pin moves to the preset position, so that the control unit controls the motor to brake and enable the firing pin to quickly reduce the movement speed and finally stop at the initial position. Optionally, the optoelectronic device may be disposed inside or outside the cylinder or at other positions where the movement of the firing pin in the cylinder can be detected.
In this example of the present application, during the period when the motor slides by the inertia, the movement speed of the firing pin is gradually reduced so that the generated kinetic energy is also relatively lower and the corresponding generated heat is also relatively lower; and then the motor is controlled to brake in a case where the motor has a relatively lower speed, so that the rotational speed of the firing pin may be easily reduced to zero, thereby achieving the purpose for accurately controlling a stop position.
In an optional example, if the sensor fails and cannot detect whether the firing pin has reached the preset position, the firing pin may exceed the initial position and continue to move toward an uppermost end of the cylinder, thus causing the nail gun to continuously fire nails and leading to dangers.
In the present application, in order to solve this problem, the control unit 53 can control the motor to brake so as to enable the firing pin to quickly reduce the movement speed until the firing pin stops moving in response to the relevant parameter of the motor being greater than or equal to a second parameter threshold. That is, if the sensor has not fed back whether the firing pin reaches the preset position, the control unit controls the firing pin to stop moving according to the parameters in the operation of the motor. It is to be noted that the second parameter threshold is a value one time or more than one time a corresponding parameter in one nailing cycle. Specifically, if the number of turns of the motor in one nailing cycle is N2, the second parameter threshold is M*N2, and if the operating time of the motor in one nailing cycle is T2, the second parameter threshold is N*T2, where both M and N are positive numbers greater than or equal to 1. For example, the second parameter threshold is N2, 1.3N2, 1.5N2, T2, 1.2T2, 1.4T2, or the like. It is to be understood that when the relevant parameter of the motor is greater than or equal to the second parameter threshold, the firing pin has completed returning from a firing position to the initial position or exceeds the initial position, that is, the firing pin has passed the preset position, but the sensor does not output position information or the position information output by the sensor is not transmitted to the control unit. Therefore, the control unit controls the motor to brake by comparing a relationship between the relevant parameter of the motor and the second parameter threshold, so that the control unit can control the nail gun to stop operating in a case where the sensor fails, thus avoiding occurrence of the danger.
It is to be understood that the above second parameter threshold is greater than the first parameter threshold. For example, the second parameter threshold is 2 times, 2.1 times, 2.2 times, or 2.3 times the first parameter threshold.
In an optional example, the nail gun may further include an alarm unit 56 for outputting alarm information. Specifically, the control unit may stop driving the motor and control the alarm unit 56 to output the alarm information in response to detecting the relevant parameter of the motor being greater than or equal to the second parameter threshold. That is, the control unit 53 can control the motor to brake so as to enable the nail gun to stop operating and give an early warning in a case where the sensor fails, so that the user can perform maintenance in time and continuous nailing and the occurrence of the danger are avoided.
A method for controlling a nail gun is described in conjunction with
In S101, a relevant parameter of a motor is acquired.
In one nailing cycle, the relevant parameter of the motor may be acquired in real time or based on a certain cycle.
In S102, in response to the relevant parameter being greater than a first parameter threshold, the motor is controlled to reduce drive power.
In S103, when a firing pin moves to a preset position during movement in a direction of an initial position, the motor is controlled to brake.
It is to be understood that after the motor is powered off, the motor continues to slide and rotate due to the inertia and drives the firing pin to continue to move in the direction of the initial position. In this process, whether the firing pin reaches the preset position can be monitored; and if yes, the motor is directly controlled to brake such that the motor quickly stop rotation, so that the firing assembly stops at a certain position. For example, the firing assembly stops at the initial position or near the initial position.
In an optional implementation, if the relevant parameter of the motor is greater than or equal to a second parameter threshold, the motor is controlled to brake. It is to be understood that the braking of the motor is a process in which the rotational speed rapidly drops to zero, and the movement speed of the firing pin also rapidly drops to zero, that is, the firing pin quickly stops when the motor brakes.
The above illustrates and describes basic principles, main features and advantages of the present disclosure. It is to be understood by those skilled in the art that the above examples do not limit the present disclosure in any form, and technical solutions obtained by means of equivalent substitution or equivalent transformation are intended to fall within the scope of the appended claims.
Number | Date | Country | Kind |
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202010301178.5 | Apr 2020 | CN | national |
202110152268.7 | Feb 2021 | CN | national |