Quick-change grinding head structure

Abstract

The utility model discloses a quick-change grinding head structure which comprises a motor assembly, a chuck assembly, a pneumatic driving device and an ejector pin, a rotor shaft of the motor assembly is provided with an axial through hole, the chuck assembly comprises an elastic chuck, a clamping sleeve, a pull rod and a spring, the elastic chuck is located in a conical cavity of the clamping sleeve, and the pneumatic driving device is arranged in the clamping sleeve. The pull rod is arranged in the mounting cavity, the lower end of the pull rod is connected with the elastic chuck, the upper end of the ejector pin is connected with the pneumatic driving device, and the lower end of the ejector pin can abut against the pull rod when moving downwards. When the grinding head needs to be replaced, the pneumatic driving device drives the pull rod to move downwards to push the elastic chuck out of the conical cavity to loosen the grinding head, after the grinding head is replaced with a new grinding head, the pneumatic driving device returns to the initial position, the pull rod pulls the elastic chuck to retract into the conical cavity under the elastic action of the spring, the purpose of clamping the grinding head is achieved, operation is easy and convenient, and practicability is high. Time and labor are saved, and the working efficiency is improved. And the pneumatic driving device adopts pneumatic control.

Description

Technical Field

[0001] This utility model relates to the field of grinding tool technology, specifically to a quick-change grinding head structure applied to a robotic arm. Background Technology

[0002] Polishing is an essential production process in the manufacturing and processing of metal or plastic workpieces. Different workpieces have different polishing requirements, and different types of polishing heads are needed to meet different polishing needs.

[0003] The utility model patent application CN109514433A, entitled "A Clamping Assembly for Quickly Changing Grinding Heads," discloses a clamping assembly for quickly changing grinding heads, including an adapter, a sleeve, and a chuck. The adapter is fixedly connected to the sleeve, and the chuck is movably disposed within the sleeve, used to clamp the rod of an external grinding head. The sleeve is provided with several first clamps for fixing the chuck, each of which is movably connected to the sleeve and protrudes from the inner wall of the sleeve. The chuck is provided with several second clamps for fixing the rod of the external grinding head, each of which is movably connected to the chuck and protrudes from the inner wall of the chuck. While the second clamps on the chuck enable quick assembly and disassembly of the external grinding head and the chuck, and the first clamps on the sleeve enable quick assembly and disassembly of the chuck and the sleeve, manual operation of the sleeve is still required to control the tightness of the chuck, which is time-consuming, labor-intensive, and affects work efficiency. Utility Model Content

[0004] To address the aforementioned shortcomings, the purpose of this utility model is to provide a quick-change grinding head structure that is rationally designed, easy to operate, and allows for convenient and rapid replacement of the grinding head.

[0005] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0006] A quick-change grinding head structure includes a motor assembly, a chuck assembly, a pneumatic drive device, and a ejector pin. The rotor shaft of the motor assembly has an axial through hole. The chuck assembly includes a spring-loaded chuck, a collet, a pull rod, and a spring. The lower end of the collet has a conical cavity adapted to the spring-loaded chuck, and the upper end has a mounting cavity. The spring-loaded chuck is located in the conical cavity. The pull rod is disposed in the mounting cavity, and its lower end is connected to the spring-loaded chuck. The upper end of the pull rod has a mating part that mates with the rotor shaft of the motor assembly. The spring is located in the mounting cavity and can push the pull rod upward. The pneumatic drive device is disposed on the motor assembly. The upper end of the ejector pin is connected to the pneumatic drive device, and its lower end passes through the axial through hole and can press against the pull rod during downward movement. When the ejector pin moves downward and presses against the pull rod, the pull rod drives the spring-loaded chuck to extend or retract relative to the conical cavity to achieve the purpose of tightening or loosening.

[0007] In a preferred embodiment of this invention, the motor assembly includes a motor base, a motor housing, and a pneumatic rotor. The motor base has a cavity for mounting the motor housing, which is located within the cavity. The pneumatic rotor is housed within the motor housing, with its rotor shaft extending beyond the housing. An inertia wheel is mounted on the rotor shaft to stabilize the rotational speed and prevent sudden changes in load speed. The pneumatic drive device is mounted on the motor base, making installation simple and convenient.

[0008] As a preferred embodiment of this utility model, the pneumatic drive device includes a cavity shell, a movable rod, a fixed block, and a movable block. The cavity shell has a movable cavity for the movable block to move up and down. The fixed block is disposed on the opening of the movable cavity. The movable block is located inside the movable cavity, and the cavity shell has a downward air port and an upward air port corresponding to the upper and lower positions of the movable block. The movable rod is fixed to the movable block, and its lower end protrudes through the fixed block and is connected to the pull rod. The movable rod is driven to perform a telescopic movement through the movable block.

[0009] As a preferred embodiment of this utility model, buffer pads are provided on the upper and lower surfaces of the movable block, which have a buffering effect, reduce impact force, and extend service life.

[0010] As a preferred embodiment of this utility model, the mating part is flat, and the upper end of the pull rod is provided with a slot that matches the mating part. The structure is simple and the mating effect is good.

[0011] As a preferred embodiment of this utility model, the lower part of the pull rod is provided with a slot extending along its axial direction, and the sleeve is provided with a locking shaft passing through the slot. Through the cooperation of the slot and the locking shaft, the pull rod moves up and down relative to the sleeve, and at the same time drives the sleeve to rotate.

[0012] As a preferred embodiment of this utility model, the chuck assembly further includes a protective shell, which is fixed on the motor base. The chuck is disposed inside the protective shell through a bearing, providing good protection and an aesthetically pleasing appearance.

[0013] The beneficial effects of this utility model are as follows: The structure of this utility model is reasonably designed. When the grinding head needs to be replaced, the pneumatic drive device drives the pull rod downwards to push the elastic chuck out of the conical cavity, thus loosening the grinding head. After replacing the grinding head, the pneumatic drive device returns to its initial position, and the pull rod, under the elastic force of the spring, pulls the elastic chuck back into the conical cavity, thus clamping the grinding head. The operation is simple, convenient, time-saving, and labor-saving, thereby improving work efficiency. Furthermore, the pneumatic drive device uses pneumatic control.

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0015] Figure 1 This is a cross-sectional structural diagram of the present invention.

[0016] Figure 2 This is an exploded structural diagram of the present invention. Detailed Implementation

[0017] See the example. Figure 1 and Figure 2 This embodiment provides a quick-change grinding head structure, which includes a motor assembly 1, a chuck assembly 2, a pneumatic drive device 3, and an ejector pin 4.

[0018] The motor assembly 1 includes a motor base 11, a motor housing 12, a pneumatic rotor 13, and an inertia wheel 14. The motor base 11 has a receiving cavity 111 for mounting the motor housing 12. The motor housing 12 is fixed within the receiving cavity 111 by a snap-fit ​​structure or screws. The pneumatic rotor 13 moves within the motor housing 12, and its rotor shaft 131 extends out of the motor housing 12. The inertia wheel 14 is threaded onto the upper end of the rotor shaft 131 of the pneumatic rotor 13 to stabilize the rotational speed and prevent sudden changes in load speed. The rotor shaft 131 of the motor assembly 1 has an axial through hole for the passage of the ejector pin 4.

[0019] The chuck assembly 2 includes a spring-loaded chuck 21, a sleeve 22, a pull rod 23, a spring 24, and a protective shell 25. The protective shell 25 is fixed to the motor base 11. The sleeve 22 is disposed within the protective shell 25 via a bearing 26. The lower end of the sleeve 22 is milled to form a tapered cavity 221 adapted to the spring-loaded chuck 21. An mounting cavity 222 is machined at the upper end of the sleeve 22. The spring-loaded chuck 21 is assembled at the position of the tapered cavity 221. The pull rod 23 is disposed within the mounting cavity 222, and the lower end of the pull rod 23 is connected to the spring-loaded chuck 21 via a threaded structure.

[0020] The upper end of the pull rod 23 radially enlarges to form a head, which has a mating part that mates with the rotor shaft 131 of the motor assembly 1. In this embodiment, the mating part is preferably a slot 231, and the lower end of the rotor shaft 131 of the motor assembly 1 is flat, which allows it to be easily inserted into the slot 231 for mating. This design is simple and provides a good fit. In other embodiments, the mating part can also be a square slot, while the lower end of the rotor shaft 131 of the motor assembly 1 is square-shaped.

[0021] The spring 24 is located within the mounting cavity 222 and can push against the head of the pull rod 23, using its own elastic force to force the pull rod 23 upward. The lower part of the pull rod 23 is provided with a slot 232 extending along its axial direction, and the sleeve 22 is provided with a locking shaft 223 passing through the slot 232. Through the cooperation of the slot 232 and the locking shaft 223, the pull rod 23 moves up and down relative to the sleeve 22, and at the same time can drive the sleeve 22 to rotate.

[0022] The pneumatic drive device 3 is mounted on the motor base 11. The pneumatic drive device 3 includes a housing 31, a movable rod 32, a fixed block 33, and a movable block 34. The housing 31 contains a movable cavity 311 for the movable block 34 to move up and down. The fixed block 33 is positioned at the opening of the movable cavity 311. The movable block 34 is located within the movable cavity 311. Buffer pads are provided on the upper and lower surfaces of the movable block 34 to provide cushioning, reduce impact force, and extend service life. The movable rod 32 is fixed to the movable block 34, and its lower end extends through the fixed block 33 and connects with the pull rod 23. The movable rod 32 is extended or retracted via the movable block 34. Corresponding to the upper and lower positions of the movable block 34, the housing 31 has a downward air port 312 and an upward air port 313. The upper end of the ejector pin 4 is in contact with or close to the movable rod 32 of the pneumatic drive device 3, and the lower end of the ejector pin 4 passes through the axial through hole and can press against the slot 231 of the pull rod 23 when it moves downward. When the ejector pin 4 moves downward and presses against the pull rod 23, the pull rod 23 drives the elastic clamp 21 to extend or retract relative to the conical cavity 221 to achieve the purpose of tightening or loosening.

[0023] When the grinding head needs to be replaced, high-pressure gas is introduced into the downward air port 312, which pushes the movable block 34 downward. This, in turn, pushes the ejector pin 4 via the movable rod 32, forcing the pull rod 23 downward and pushing the spring chuck 21 out of the conical cavity 221, thus releasing the grinding head. After replacing the grinding head, when high-pressure gas is introduced into the upward air port 313, it pushes the movable block 34 upward back to its initial position, relieving the pressure on the ejector pin 4. Under the elastic force of the spring 24, the pull rod 23 pulls the spring chuck 21 into the conical cavity 221, thus clamping the grinding head. The operation is simple, convenient, and highly efficient.

[0024] Based on the disclosure and teachings of the above specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, this utility model is not limited to the specific embodiments disclosed and described above, and some modifications and changes to this utility model should also fall within the protection scope of the claims of this utility model. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on this utility model. As described in the above embodiments of this utility model, other grinding head structures obtained by adopting the same or similar structures are all within the protection scope of this utility model.

Claims

1. A quick-change grinding head structure, comprising a motor assembly and a chuck assembly, characterized in that: It also includes a pneumatic drive device and a ejector pin. The rotor shaft of the motor assembly has an axial through hole. The chuck assembly includes a spring chuck, a sleeve, a pull rod, and a spring. The lower end of the sleeve has a conical cavity adapted to the spring chuck, and the upper end has a mounting cavity. The spring chuck is located in the conical cavity. The pull rod is disposed in the mounting cavity, and the lower end of the pull rod is connected to the spring chuck. The upper end of the pull rod has a mating part that cooperates with the rotor shaft of the motor assembly. The spring is located in the mounting cavity and can push the pull rod upward. The pneumatic drive device is disposed on the motor assembly. The upper end of the ejector pin is connected to the pneumatic drive device, and the lower end passes through the axial through hole and can press against the pull rod when moving downward.

2. The quick-change grinding head structure according to claim 1, characterized in that: The motor assembly includes a motor base, a motor housing, and a pneumatic rotor. The motor base has a receiving cavity for mounting the motor housing. The motor housing is disposed in the receiving cavity. The pneumatic rotor is disposed in the motor housing, and the rotor shaft of the pneumatic rotor extends out of the motor housing. The pneumatic drive device is disposed on the motor base.

3. The quick-change grinding head structure according to claim 2, characterized in that: An inertia wheel is provided on the rotor shaft of the pneumatic rotor.

4. The quick-change grinding head structure according to claim 1 or 2, characterized in that: The pneumatic drive device includes a cavity shell, a movable rod, a fixed block, and a movable block. The cavity shell has a movable cavity for the movable block to move up and down. The fixed block is disposed on the opening of the movable cavity. The movable block is located inside the movable cavity, and the cavity shell has a downward air port and an upward air port corresponding to the upper and lower positions of the movable block. The movable rod is fixed to the movable block, and its lower end protrudes through the fixed block and is connected to the pull rod.

5. The quick-change grinding head structure according to claim 4, characterized in that: The upper and lower surfaces of the movable block are provided with cushioning pads.

6. The quick-change grinding head structure according to claim 4, characterized in that: The mating part is flat, and the upper end of the pull rod is provided with a slot that matches the mating part.

7. The quick-change grinding head structure according to claim 4, characterized in that: The lower part of the pull rod is provided with a slot extending along its axial direction, and the sleeve is provided with a locking shaft passing through the slot.

8. The quick-change grinding head structure according to claim 2, characterized in that: The chuck assembly also includes a protective shell, which is fixed to the motor mount, and the chuck is disposed inside the protective shell via a bearing.

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