Patent Application
20130048328
The present invention relates to a bidirectional cross airflow machine tool and particularly to a machine tool capable of generating bidirectional cross airflow inside during operation to disperse heat.
Techniques of machine tools such as grinder are known in industries. For instance, R.O.C. patent Nos. M261316 and M288839 respectively disclose a machine tool that mainly include a body, a motor located in the body and a tool spindle driven by the motor to rotate. The tool spindle is coupled with two balance weights to rotate eccentrically. The two balance weights also are coupled with an action member. When the motor is started, the tool spindle is driven to rotate eccentrically. Through the two balance weights, the action member is driven to perform fabrication processes on a workpiece. However, the motor easily generates and accumulates heat during operation of the machine tool, and becomes overheated that could affect operation duration of the machine tool. As a result, durability of the machine tool also is impacted.
To remedy the aforesaid problem improving techniques have been proposed. For instance, China patent No. CN2887526 discloses a technique by forming an air inlet and an air outlet at corresponding locations of the body of a machine tool. When the motor is operating the air inlet sucks in external air and internal heat is discharged through the air outlet to cool the motor so that the problem of heat accumulation of the motor can be overcome. However, the two balance weights and action member also generate a great amount of heat during operation. The prior art CN2887526 can merely disperse heat for the motor without cooling the two balance weights. Moreover, during operation dusts are easily carried by the dispersed air to enter the motor. Hence durability of the machine tool still is a big concern.
Another improvement is disclosed in China patent No. CN201611818 in which a circular grinder has an air inlet formed at a location corresponding to a balance weight. The balance weight has an air fan to suck air through the air inlet and transmit the air downwards, and the air is then discharged via a gap between the circular grinder and a grinding disk. Such a design not only can disperse heat, also can prevent dusts from entering the motor.
However, not all machine tools respectively have a gap at the lower side to serve as an outlet of hot air. For instance, an orbital sander can suck external cooling air, but still cannot discharge internal hot air outside. Thus cooling effect is not desirable.
The primary object of the present invention is to solve the aforesaid disadvantages to reduce internal temperature of machine tools and disperse heat effectively.
To achieve the foregoing object the invention provides a bidirectional cross airflow machine tool that includes a machine tool and a radiator. The machine tool has air inlets and air outlets on two sides arranged in an up and down manner, and also a housing chamber to hold a tool spindle. The tool spindle is coupled with a balance weight member which includes a first balance weight portion and a second balance weight portion arranged in an up and down manner so that the tool spindle can generate eccentric rotation against the machine tool. The radiator is located on the balance weight member and rotates synchronously with the tool spindle, and has a first vane set located on the first balance weight portion and a second vane set located on the second balance weight portion. The first vane set sucks air via the air inlets at one side of the machine tool while the tool spindle is rotating. The air is transmitted from the first vane set to the first and second balance weight portions, and then is discharged via the second vane set through the air outlets at another side of the machine tool to form cross cooling airflow.
In an embodiment of the invention, the first vane set includes a plurality of air intake vanes located outside the first balance weight portion. The air intake vanes are respectively formed in an arched profile to transmit the air from the first balance weight portion to the second balance weight portion. The second vane set includes a plurality of air discharge vanes located outside the second balance weight portion. The air discharge vanes are respectively formed in a flat shape to transmit the air from the second balance weight portion to the air outlets. The first and second vane sets have respectively a first coupling portion and a second coupling portion to form coupling and positioning. The first and second coupling portions are respectively a notch and a lug. The first vane set is formed at an elevation the same as that of the air inlet, while the second vane set is formed at another elevation the same as that of the air outlet.
The foregoing, as well as additional objects, features and advantages of the invention will be more readily apparent from the following detailed description, which proceeds with reference to the accompanying drawings.
Please refer to
The radiator 30 is located on the balance weight member 21 and rotates synchronously and eccentrically against the tool spindle 20. The radiator 30 includes a first vane set 31 located on the first balance weight portion 211 and a second vane set 32 located on the second balance weight portion 212. The first and second vane sets 31 and 32 have respectively a first coupling portion 312 and a second coupling portion 322 for coupling and positioning. As shown in the drawings, the first and second coupling portions 312 and 322 are respectively a notch and a lug. In addition, the first vane set 31 is formed at an elevation the same as that of the air inlet 12 and includes a plurality of air intake vanes 311 arranged outside the first balance weight portion 211. The air intake vanes 311 are respectively formed in an arched profile. The second vane set 32 is formed at an elevation the same as that of the air outlet 13 and includes a plurality of air discharge vanes 321 arranged outside the second balance weight portion 212. The air discharge vanes 321 are respectively formed in a flat shape. Thus forms the main structure of the invention.
Referring to
As a conclusion, the present invention mainly provides the air inlets 12 and air outlets 13 at two sides of the machine tool 10 in an up and down manner, and also provides the first vane set 31 on the first balance weight portion 211 and second vane set 32 on the second balance weight portion 212 so that the first vane set 31 sucks air via the air inlets 12 at one side of the machine tool 10 during rotation of the tool spindle 20, and the air is conducted from the first vane set 31 to the first and second balance weight portions 211 and 212 and then is discharged through the air outlets 13 at another side of the machine tool 10. Thus a cooling cross airflow is generated continuously to form an effective cooling system. Dust generated during operation of the machine tool 10 can also be prevented from entering the motor or control circuits of the machine tool 10 without forming damages to the tool.
While the preferred embodiment of the invention has been set forth for the purpose of disclosure, modifications of the disclosed embodiment of the invention as well as other embodiments thereof may occur to those skilled in the art. Accordingly, the appended claims are intended to cover all embodiments which do not depart from the spirit and scope of the invention.
