Electric grinding tool capable of quickly and automatically clamping chuck

Abstract

The utility model discloses an electric grinding tool capable of quickly and automatically clamping a chuck, which comprises a rotary transmission component and a rotary main shaft, one end of the rotary main shaft is fixedly connected with the driving end of the rotary transmission component, and the other end of the rotary main shaft is detachably connected with a chuck component through a pull rod body; the chuck assembly comprises a chuck base and a chuck body arranged in the chuck base in a sliding mode. When the telescopic transmission assembly is started, the telescopic transmission assembly can push the pull rod body to move in the direction away from the rotary driving assembly, so that the clamping part on the chuck body protrudes out of the chuck base and is in a loosened state. The pull rod body is sleeved with a spring, and when the telescopic transmission assembly is closed, the spring is in an extending state and can push the pull rod body to move in the direction close to the rotary driving assembly, so that the clamping part on the chuck body retracts into the chuck base and is in a clamping state. The grinding head can be automatically clamped or loosened so that the grinding head can be rapidly detached and replaced, and the replacement efficiency of the grinding head is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to electric polishing tool technical field especially relates to a kind of electric polishing tool of quick automatic clamping chuck. BACKGROUND

[0002] The polishing machine is also called grinding machine, often used as mechanical grinding, polishing and waxing, its working principle is: driving motor drives the sponge or wool polishing disc installed on the output component of polishing machine high-speed rotation, by polishing disc and polishing agent jointly act and with the surface to be polished friction, i.e. realize the function of removing paint surface pollution, oxide layer, shallow mark.

[0003] In the use process of electric polisher, different grinding heads need to be replaced for use due to different fineness of polishing, electric polisher output shaft and grinding head are generally fixedly connected by multiple bolts or threaded shafts, which is troublesome to install and disassemble, and the grinding head is not convenient to replace quickly.

[0004] Therefore, the utility model provides a kind of electric polishing tool of quick automatic clamping chuck to solve the above problems. INVENTION CONTENTS

[0005] To overcome the above-mentioned shortcomings, the utility model aims to provide an electric polishing tool capable of quickly and automatically clamping a chuck, which can automatically clamp or release the grinding head to realize quick disassembly and replacement of the grinding head, thereby improving the replacement efficiency of the grinding head.

[0006] To achieve the above purpose, the utility model adopts the technical scheme of an electric polishing tool capable of quickly and automatically clamping a chuck, comprising a rotary drive assembly, a telescopic transmission assembly, and a chuck assembly for clamping a grinding head.

[0007] The rotary transmission assembly comprises a rotating main shaft, one end of which is fixedly connected with the driving end of the rotary drive assembly, and the other end is detachably connected with the chuck assembly through a pull rod body.

[0008] The chuck assembly comprises a chuck seat and a chuck body slidingly arranged inside the chuck seat.

[0009] The telescopic transmission assembly is in corresponding position with the pull rod body, and when started, it can push the pull rod body to move away from the rotary drive assembly, so that the clamping part on the chuck body protrudes from the chuck seat and is in a released state.

[0010] A spring is sleeved on the pull rod body, and when the telescopic transmission assembly is closed, the spring is in an extended state and can push the pull rod body to move towards the rotary drive assembly, so that the clamping part on the chuck body retracts into the chuck seat and is in a clamped state.

[0011] Further, the rotating driving assembly comprises a motor housing and a driving motor arranged in the motor housing. The driving motor provides driving force for the rotation of the chuck assembly.

[0012] Further, the telescopic transmission assembly comprises a transmission circle base and a transmission cylinder. The transmission cylinder is arranged in a cylinder accommodating cavity formed in the transmission circle base along the length direction of the transmission circle base. The transmission cylinder comprises a cylinder piston, a cylinder front cover and a cylinder push rod horizontally penetrating the cylinder piston and the cylinder front cover. When the cylinder push rod of the transmission cylinder is extended, the chuck body is moved out of the chuck seat and the clamping part is in an open state, so that the grinding head is inserted and placed, and the chuck body is automatically opened.

[0013] Further, the cylinder accommodating cavity comprises a distance limiting cavity, and the cylinder piston is arranged in the distance limiting cavity. The length of the distance limiting cavity in the axial direction is the moving stroke of the cylinder push rod, so as to limit the distance that the transmission cylinder is extended to move the pull rod body, and further limit the distance that the clamping part of the chuck body protrudes from the chuck seat.

[0014] Specifically, the moving stroke is set to 2-3 mm.

[0015] Further, two air pipe joints are arranged on the outer wall of the transmission circle base, and two inner holes corresponding to the air pipe joints are formed in the outer wall of the transmission circle base and are connected with the distance limiting cavity. The inside of the transmission cylinder is ventilated through the air pipe joints. In some embodiments, referring to the accompanying drawings, Figure 2 When the grinding head needs to be replaced, the air pipe joints are ventilated, the cylinder push rod moves to the right to contact the side edge of the pull rod body and pushes the pull rod body to move to the right, so that the chuck body connected with the pull rod body by threads also moves to the right out of the chuck seat. At this time, the clamping part is opened and the corresponding grinding head can be inserted. Then, the air pipe joints are not ventilated, the pressure applied by the transmission cylinder on the pull rod body disappears, the spring is not compressed and gradually returns to the extended state, and the pull rod body is pushed to move to the left. The clamping part of the chuck body enters the chuck seat, at this time, the clamping part is in a clamping state and can clamp the grinding head. The spring can also ensure that the grinding head will not be thrown out during the rotation and grinding process.

[0016] Further, the cylinder push rod is a hollow structure, the rotating main shaft is coaxially arranged with the cylinder push rod, at least part of the rotating main shaft is arranged in the cylinder push rod, and an end of the rotating main shaft away from the rotating driving assembly extends out of the cylinder push rod and can be inserted into the pull rod body. The rotating main shaft is rotationally connected in the cylinder push rod. When the rotating main shaft rotates, the cylinder push rod does not interfere with the rotation of the rotating main shaft, and the rotating main shaft also does not interfere with the extension of the cylinder push rod.

[0017] Further, the pull rod body is provided with a polygonal groove near one end of the cylinder push rod, and the rotating main shaft is provided with a polygonal shaft matching the polygonal groove at one end of the pull rod body, so that the rotating main shaft can drive the pull rod body to rotate when the rotating main shaft rotates. When the cylinder push rod of the transmission cylinder extends to push the pull rod body to move forward, the polygonal shaft and the polygonal groove can move relative to each other by a distance, but the polygonal shaft is always located in the polygonal groove and will not be separated from the polygonal groove, which ensures that the polygonal shaft can drive the pull rod body to rotate when the polygonal shaft rotates.

[0018] Further, the pull rod body comprises a first segment and a second segment which are integrally formed, and the tail of the second segment is provided with a threaded segment, and the pull rod body is threadedly connected with the connecting portion on the chuck body through the threaded segment. The pull rod body and the chuck body are detachably installed together, on the one hand, the chuck body can be driven to rotate by the rotation of the pull rod body, so that the grinding head clamped on the chuck body can rotate to grind the workpiece; on the other hand, the chuck body is convenient to replace and maintain, and the user is convenient to operate.

[0019] It should be noted that the connecting portion on the pull rod body and the chuck body can not be connected only by threads, but also can be connected by a pin shaft or other detachable known mechanical mechanisms, which will not be described here.

[0020] Further, the chuck seat comprises a front shell and a front shaft rotatably arranged in the front shell, the front shaft extends out of the front shell, and the front shaft is sequentially provided with a pull rod accommodating cavity and a chuck accommodating cavity which are communicated along the length direction of the front shaft, one end of the pull rod body away from the rotating main shaft is connected with the chuck accommodating cavity through a connecting pin shaft, and the spring is specifically wrapped on the part of the second segment of the pull rod body located in the pull rod accommodating cavity. When the rotating main shaft drives the pull rod body to rotate, the front shaft connected with the pull rod body through the connecting pin shaft can also rotate, and will not interfere with the rotation of the chuck body.

[0021] The chuck accommodating cavity can accommodate the chuck body to be completely retracted, and the chuck accommodating cavity is matched with the structure size of the clamping portion of the chuck body. Specifically, the chuck accommodating cavity comprises a cylindrical segment and a circular table segment, the circular table segment facilitates the retraction of the clamping portion on the chuck body, and also can extrude the outer periphery of the clamping portion, thereby promoting the clamping portion to clamp the end of the polishing head which is not polished in the clamping portion.

[0022] Further, the second segment of the pull rod body is at least partially located in the chuck accommodating cavity, and a through pin shaft moving groove for inserting and moving the connecting pin shaft is formed on the second segment along the length direction of the second segment. The pin shaft moving groove can be used to limit the distance of the pull rod body moving towards the rotating main shaft under the elastic force of the spring.

[0023] The beneficial effects of the utility model are as follows:

[0024] The utility model discloses a rotating drive assembly, telescopic transmission assembly, rotary transmission assembly, chuck assembly, pull rod body and spring mutual cooperation, and the telescopic end of telescopic transmission assembly is stretched out and promotes pull rod body, so that the clamping portion on chuck body moves along chuck seat and protrudes chuck seat, at this moment, the clamping portion on chuck body can be opened automatically under the self elasticity, and the user can insert the grinding head that needs to be replaced into the clamping portion, after the grinding head is placed in position, telescopic transmission assembly is closed, and the telescopic end resets, and no longer exerts on pull rod body, and the spring on pull rod body resets, can promote pull rod body and move to the direction of close rotating drive assembly, to make the clamping portion on chuck body retract into chuck seat, and the clamping portion is retracted into chuck seat in the process of being pulled back, and is deformed, and then clamps the grinding head, realizes the quick disassembly replacement of grinding head, and effectively improves the replacement efficiency of grinding head. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is the overall structure axle side view of an embodiment of the utility model;

[0026] Figure 2 It is the overall structure axle side view of an embodiment of the utility model;

[0027] Figure 3 It is Figure 2 It is the enlarged structure schematic view of A;

[0028] Figure 4 It is the overall structure axle side view of chuck assembly of an embodiment of the utility model;

[0029] Figure 5 It is the overall structure axle side view of connecting rod body of an embodiment of the utility model;

[0030] In the drawing: 1, rotating drive assembly;11, drive motor;12, motor shell;2, telescopic transmission assembly;21, transmission round base;22, transmission cylinder;221, cylinder push rod;222, cylinder front cover;223, cylinder piston;23, cylinder containing cavity;231, distance limiting cavity;24, gas pipe joint;3, rotary transmission assembly;31, connecting bearing one;32, rotating main shaft;4, chuck assembly;41, chuck body;42, connecting portion;43, clamping portion;5, chuck seat;51, front shell;52, front shaft;53, pull rod containing cavity;54, chuck containing cavity;6, pull rod body;61, first section;62, second section;63, pin shaft movement groove;7, spring;8, connecting bearing two;9, connecting bearing three;10, connecting pin shaft. DETAILED DESCRIPTION

[0031] The advantages and features of the present application can be more easily understood by those skilled in the art, and the protection scope of the present application can be more clearly defined, by describing the preferred embodiments of the present application in detail below with reference to the accompanying drawings.

[0032] Referring to the accompanying drawings Figures 1 to 5 The electric polishing tool with the fast and automatic clamping chuck in the embodiment comprises a rotary driving assembly 1, a telescopic transmission assembly 2 and a chuck assembly 4 for clamping the grinding head.

[0033] The rotary transmission assembly 3 comprises a rotating main shaft 32, one end of which is fixedly connected with the driving end of the rotary driving assembly 1, and the other end is detachably connected with the chuck assembly 4 through the pull rod body 6.

[0034] The chuck assembly 4 comprises a chuck seat 5 and a chuck body 41 which is slidably arranged in the chuck seat 5.

[0035] The telescopic transmission assembly 2 is in position correspondence with the pull rod body 6, and when it is started, it can push the pull rod body 6 to move towards the direction away from the rotary driving assembly 1, so that the clamping part 43 on the chuck body 41 protrudes out of the chuck seat 5 and is in the loosening state.

[0036] The spring 7 is sleeved on the pull rod body 6, and when the telescopic transmission assembly 2 is closed, the spring 7 is in the extended state and can push the pull rod body 6 to move towards the direction close to the rotary driving assembly 1, so that the clamping part 43 on the chuck body 41 is retracted into the chuck seat 5 and is in the clamping state.

[0037] The chuck body 41 comprises a connecting part 42 and a clamping part 43, the connecting part 42 is detachably connected with the pull rod body 6, and the clamping part 43 is used for clamping the grinding head.

[0038] After the grinding head is placed in position, the telescopic transmission assembly 2 is closed, the telescopic end is reset, and no longer exerts on the pull rod body 6. At this time, the spring 7 on the pull rod body 6 is reset and can push the pull rod body 6 to move towards the direction close to the rotary drive assembly 1, so that the clamping part 43 on the chuck body 41 is retracted into the chuck seat 5. The clamping part 43 is deformed in the process of being pulled back into the chuck seat 5, thereby clamping the grinding head. The above structure can effectively improve the replacement efficiency of the grinding head.

[0039] The rotary drive assembly 1 comprises a motor housing 12 and a drive motor 11 located in the motor housing 12. The drive motor 11 provides driving force for the rotation of the chuck assembly 4.

[0040] It should be noted that it is not limited to the drive motor 11, but also to the mechanical mechanism that can drive the rotation of the index plate and other components. In this application, the drive motor 11 is selected to reduce the overall volume of the electric polishing tool, making it easier for the user to operate and use.

[0041] The telescopic transmission assembly 2 comprises a transmission circle base 21 and a transmission cylinder 22. The transmission cylinder 22 is arranged in the cylinder accommodating cavity 23 of the transmission circle base 21. The transmission cylinder 22 comprises a cylinder piston 223, a cylinder front cover 222 and a cylinder push rod 221 horizontally penetrating both. When the cylinder push rod 221 of the transmission cylinder 22 is extended, it can push the chuck body 41 to move out of the chuck seat 5 and make the clamping part 43 in a loose state, which is convenient for the insertion and placement of the grinding head, and realizes the automatic opening of the chuck body 41.

[0042] In some embodiments, the motor housing 12 is at least partially located in the transmission circle base 21, and the outer wall thereof is fixedly connected with the transmission circle base 21 by locking screws. The end of the motor housing 12 connected with the transmission circle base 21 is also provided with a click sealing ring to prevent water from entering the motor housing 12 and affecting the service life of the drive motor 11 and the transmission cylinder 22.

[0043] In some embodiments, the end of the rotary main shaft 32 connected with the rotary drive assembly 1 is also connected with the inner wall of the transmission circle base 21 through the connecting bearing one 31. The connecting bearing one 31 can support the end of the rotary main shaft 32 connected with the drive motor 11 to improve the stability of the overall electric polishing tool.

[0044] The cylinder accommodating cavity 23 comprises a distance limiting cavity 231, and the cylinder piston 223 is located in the distance limiting cavity 231. The length of the distance limiting cavity 231 in the axial direction is the moving stroke of the cylinder push rod 221, so as to limit the distance that the transmission cylinder 22 moves to push the pull rod body 6, and further limit the distance that the clamping part 43 on the chuck body 41 protrudes from the chuck seat 5.

[0045] Specifically, the above-mentioned moving stroke is set to 2-3 mm.

[0046] The outer wall of the transmission circle base 21 is provided with two air pipe joints 24, and the outer wall of the transmission circle base 21 is provided with two inner holes corresponding to the air pipe joints 24, which are connected with the distance limiting cavities 231. The inside of the transmission cylinder 22 is ventilated through the air pipe joints 24. In some embodiments, referring to the attached drawings, Figure 2 When the grinding head needs to be replaced, the air pipe joints 24 are ventilated, the cylinder push rod 221 moves to the right to contact the side edge of the pull rod body 6, and pushes the pull rod body 6 to move to the right, so that the chuck body 41 connected with the pull rod body 6 also moves to the right out of the chuck seat 5. At this time, the clamping part 43 is opened, and the corresponding grinding head can be inserted. Then, the air pipe joints 24 are no longer ventilated, and the pressure applied by the transmission cylinder 22 on the pull rod body 6 disappears. At this time, the spring 7 is not compressed and gradually returns to the extended state, and pushes the pull rod body 6 to move to the left. The clamping part 43 of the chuck body 41 enters the chuck seat 5. At this time, the clamping part 43 is in a clamping state and can clamp the grinding head. The spring 7 can also ensure that the grinding head will not be thrown out during the rotation and grinding process.

[0047] The inside of the cylinder push rod 221 is a hollow structure, the rotating main shaft 32 is coaxially arranged with the cylinder push rod 221, and at least part of the rotating main shaft 32 is located in the cylinder push rod 221. The end of the rotating main shaft 32 away from the rotation driving assembly 1 extends out of the cylinder push rod 221 and can be inserted into the pull rod body 6. The rotating main shaft 32 is rotationally connected in the inside of the cylinder push rod 221. When the rotating main shaft 32 rotates, the cylinder push rod 221 will not interfere with the rotation thereof. Similarly, the rotating main shaft 32 will not interfere with the extension of the cylinder push rod 221.

[0048] A multi-angle groove is arranged on one end of the pull rod body 6 close to the cylinder push rod 221. The end of the rotating main shaft 32 close to the pull rod body 6 is arranged as a multi-angle shaft matched with the multi-angle groove, so that the rotating main shaft 32 can drive the pull rod body 6 to rotate when the rotating main shaft 32 rotates. When the cylinder push rod 221 of the transmission cylinder 22 extends to push the pull rod body 6 to move forward, the multi-angle shaft and the multi-angle groove can move relative to each other by a certain distance, but the multi-angle shaft is always located in the multi-angle groove and will not be separated from the multi-angle groove, which ensures that the multi-angle shaft can drive the pull rod body 6 to rotate when the multi-angle shaft rotates.

[0049] The pull rod body 6 comprises a first section 61 and a second section 62 which is provided with a threaded section at the tail end, and the pull rod body 6 is threadedly connected with the connecting portion 42 on the chuck body 41 through the threaded section. The pull rod body 6 is detachably mounted with the chuck body 41, on one hand, the rotation of the pull rod body 6 can drive the chuck body 41 to rotate, so that the grinding head clamped on the chuck body 41 can rotate to grind the workpiece; on the other hand, the chuck body 41 is convenient to replace and maintain, and the user is convenient to operate.

[0050] It should be noted that the connection between the pull rod body 6 and the connecting portion 42 on the chuck body 41 is not limited to be threadedly connected, but also can be connected through a pin shaft or other known detachable mechanical mechanism, which will not be described in detail here.

[0051] The chuck seat 5 comprises a front shell 51 and a front shaft 52 rotatably arranged in the front shell 51, the front shaft 52 extends out of the front shell 51, and the front shaft 52 is sequentially provided with a pull rod accommodating cavity 53 and a chuck accommodating cavity 54 which are communicated in the length direction of the front shaft 52, one end of the pull rod body 6 away from the rotating main shaft 32 is connected with the chuck accommodating cavity 54 through a connecting pin shaft 10, and the spring 7 is specifically wrapped on the part of the second section 62 of the pull rod body 6 located in the pull rod accommodating cavity 53. When the rotating main shaft 32 drives the pull rod body 6 to rotate, the front shaft 52 connected with the pull rod body 6 through the connecting pin shaft 10 can also rotate, and does not interfere with the rotation of the chuck body 41.

[0052] The chuck accommodating cavity 54 can accommodate the chuck body 41 to be completely retracted, and the structure size of the chuck accommodating cavity 54 matches that of the clamping portion 43 of the chuck body 41. Specifically, the chuck accommodating cavity 54 comprises a cylindrical section and a circular frustum section, the circular frustum section facilitates the clamping portion 43 on the chuck body 41 to be retracted, and also can extrude the outer periphery of the clamping portion 43, thereby promoting the clamping portion 43 to clamp the end of the grinding head which is not ground in the clamping portion 43.

[0053] In some embodiments, the cross section of the pull rod body 6 is T-shaped.

[0054] In some embodiments, one end of the outer wall of the front shaft 52 corresponding to the pull rod accommodating cavity 53 close to the rotating main shaft 32 is connected with the front shell 51 through a connecting bearing two 8, and one end of the outer wall of the front shaft 52 corresponding to the chuck accommodating cavity 54 close to the pull rod accommodating cavity 53 is connected with the front shell 51 through a connecting bearing three 9. The front shell 51 does not interfere with the rotation of the front shaft 52.

[0055] Specifically, the connecting bearing three 9 is two single-row bearings, so as to improve the bearing capacity of the part of the front shaft 52 corresponding to the chuck accommodating cavity 54, and thereby improve the service life.

[0056] The second section 62 on the pull rod body 6 is at least partially located in the chuck accommodating cavity 54, and a through pin shaft moving groove 63 for inserting and moving the connecting pin shaft 10 is formed on the second section 62 along the length direction thereof. The pin shaft moving groove 63 is arranged to limit the distance of the pull rod body 6 moving towards the direction of approaching the rotating main shaft 32 under the elastic force of the spring 7.

[0057] The above embodiments are only for illustrating the technical concept and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and implement it, and cannot limit the protection scope of the present application. Any equivalent changes or modifications made according to the spirit and essence of the present application shall be covered within the protection scope of the present application.

Claims

1. A power sander capable of quick automatic chucking, characterized by: The rotating driving assembly, the telescopic transmission assembly and the chuck assembly for clamping the grinding head are included; The rotating transmission assembly includes a rotating main shaft, one end of which is fixedly connected with the driving end of the rotating driving assembly, and the other end is detachably connected with the chuck assembly through a pull rod body; The chuck assembly includes a chuck seat and a chuck body slidingly arranged in the chuck seat; The telescopic transmission assembly has a telescopic end corresponding to the position of the pull rod body, and when started, it can push the pull rod body to move away from the rotating driving assembly, so that the clamping part on the chuck body protrudes from the chuck seat and is in a loosened state; The spring is sleeved on the pull rod body, and when the telescopic transmission assembly is closed, the spring is in an extended state and can push the pull rod body to move towards the rotating driving assembly, so that the clamping part on the chuck body retracts into the chuck seat and is in a clamped state.

2. The electric power tool capable of quickly and automatically clamping a chuck according to claim 1, characterized in that: The rotating driving assembly includes a motor housing and a driving motor located in the motor housing.

3. The electric power tool capable of quickly and automatically clamping a chuck according to claim 1, characterized in that: The telescopic transmission assembly includes a transmission circle base and a transmission cylinder, the transmission cylinder is arranged in a cylinder accommodating cavity formed in the transmission circle base along the length direction of the transmission circle base, and the transmission cylinder includes a cylinder piston, a cylinder front cover and a cylinder push rod horizontally penetrating both.

4. The electric power tool capable of quickly and automatically clamping a chuck according to claim 3, characterized in that: The cylinder accommodating cavity includes a distance limiting cavity, and the cylinder piston is located in the distance limiting cavity.

5. The power sander of claim 4, wherein: Two air pipe joints are arranged on the outer wall of the transmission circle base, and two inner holes corresponding to the air pipe joints are formed in the outer wall of the transmission circle base and are in communication with the distance limiting cavity.

6. The electric power tool capable of quickly and automatically clamping a chuck according to claim 3, characterized in that: The cylinder push rod is a hollow structure, the rotating main shaft is coaxially arranged with the cylinder push rod, at least part of the rotating main shaft is located in the cylinder push rod, and one end of the rotating main shaft away from the rotating driving assembly extends out of the cylinder push rod and can be inserted into the pull rod body.

7. The electric power tool capable of quickly and automatically clamping a chuck according to claim 4, characterized in that: A multi-angle groove is formed in one end of the pull rod body close to the cylinder push rod, and one end of the rotating main shaft close to the pull rod body is provided with a multi-angle shaft matched with the multi-angle groove, so that the rotating main shaft can drive the pull rod body to rotate when the rotating main shaft rotates.

8. The electric power tool capable of quickly and automatically clamping a chuck according to claim 1, characterized in that: The pull rod body includes a first section and a second section formed integrally, a threaded section is arranged at the tail of the second section, and the pull rod body can be threadedly connected with a connecting part on the chuck body through the threaded section.

9. The power sander of claim 8, wherein: The chuck seat includes a front shell and a front shaft rotatably arranged in the front shell, the front shaft extends out of the front shell, a pull rod accommodating cavity and a chuck accommodating cavity are sequentially formed in the front shaft along the length direction of the front shaft and are in communication, one end of the pull rod body away from the rotating main shaft is connected with the chuck accommodating cavity through a connecting pin shaft, and the spring is wrapped around the part of the second section of the pull rod body located in the pull rod accommodating cavity.

10. The power sander of claim 9, wherein: At least part of the second section of the pull rod body is located in the chuck accommodating cavity, and a pin shaft moving groove is formed in the second section along the length direction of the second section for inserting and moving the connecting pin shaft.

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