A polishing apparatus and a polishing method for automatically switching a clamping piston pin

Abstract

The application provides a polishing device and polishing method for automatically switching clamping piston pins, and relates to the technical field of machining. The device bin is internally fixedly provided with a workbench; the top front side and the middle of the workbench are fixedly provided with two groups of spindle holders, and the two groups of spindle holders are fixedly provided with a main support shaft; the clamping switching disc is integrally provided with a middle shaft sleeve in the middle, and is rotationally arranged outside the main support shaft; eight clamping grooves are uniformly distributed around the clamping switching disc; the clamping switching disc is provided, piston pin multi-station circulation and synchronous polishing function are provided, the clamping switching disc is driven to rotate by the driving motor, the piston pin is sequentially circulated to the feeding, polishing and discharging stations, the planar and inner conical polishing wheels are matched, the end face and chamfer polishing are synchronously completed through one feeding, clamping errors in multi-process machining are avoided, the workpiece is not scratched due to secondary clamping, and all processing steps are synchronously executed.

Description

Technical Field

[0001] This invention relates to the field of machining technology, and in particular to a polishing device and polishing method for automatically switching clamping piston pins. Background Technology

[0002] Piston pins are the core transmission components of various piston-connecting rod mechanisms. They are used to connect the piston and connecting rod and transmit the pressure borne by the piston to the connecting rod. They need to be polished and chamfered on their surface and end face. Chamfering makes it easier to insert polishing equipment into the piston connection. If the end face is not flat, chamfering is also more troublesome. Therefore, high-precision piston pins need to have their end faces polished.

[0003] The polishing equipment currently used is mainly used to polish the outer curved surface of piston pins. It requires polishing the curved surface first and then chamfering. However, the positioning during chamfering can easily damage the polished smooth surface. The uneven side end face is also inconvenient for chamfering. At present, there is no good equipment for integrated polishing of the side and chamfer. It requires multiple equipment and multiple steps for processing, which is not convenient for continuous automated mass production. Summary of the Invention

[0004] In view of the above-mentioned shortcomings of the prior art, the present invention provides a polishing device and polishing method for automatically switching clamping piston pins.

[0005] This invention provides a polishing device and method for automatically switching clamping piston pins, specifically comprising: a device compartment, wherein a worktable is fixedly installed inside the device compartment; two sets of spindle supports are fixedly installed on the top front side and the middle of the worktable, and a main support shaft is fixedly installed between the two sets of spindle supports; a clamping switching disk, wherein an intermediate bushing is integrally installed in the middle of the clamping switching disk, and the clamping switching disk is rotatably installed outside the main support shaft; eight evenly distributed clamping slots are formed around the inside of the clamping switching disk, and the outside of each clamping slot extends through the arc edge of the clamping switching disk, and at the arc edge... A through slot is provided at the front and back of the worktable; four sets of limiting slide rods are fixedly installed on both sides of the inside of the fixture slot, and a clamping block is slidably installed outside each of the four sets of limiting slide rods on each side; a control link is hinged to the side of the clamping block near the center of the clamping switching disk, and a hinge seat is hinged to the other end of the two sets of control links; a moving motor base is slidably installed on the rear side above the top of the worktable, and two sets of polishing motors are fixedly installed on the top and left side of the moving motor base. Polishing wheels are fixedly installed on the rotor end of the polishing motors. The front ends of the two sets of polishing wheels on the top are flat, and the front ends of the two sets of polishing wheels on the left are inner conical surfaces.

[0006] Optionally, a drive gear is fixedly installed on the outer rear side of the intermediate bushing; a drive motor is fixedly installed at the front end of the front main shaft frame, and a gear is installed at the rotor end of the drive motor to mesh with the drive gear; an electric cylinder seat is fixedly installed on the top rear side of the worktable, and a feed electric cylinder is fixedly installed at the front end of the electric cylinder seat, with the telescopic end of the feed electric cylinder fixed to the rear side of the moving motor seat.

[0007] Optionally, springs are provided between the inner walls on both sides of the clamping groove and the clamping block, and a circular groove for accommodating the springs is also provided in the clamping groove; a sliding frame is fixedly provided on the front side of the clamping groove, and the front end of the hinge seat slides in the sliding frame, and a control wheel is rotatably provided on the front end of the hinge seat.

[0008] Optionally, guide channels are fixedly provided at the slotted positions around the front side of the clamping switching disk, and connecting plates are slidably arranged in the guide channels. Springs are provided on the front side of the connecting plates. Positioning rods are fixedly provided at the rear end of the connecting plates, and the positioning rods extend out of the rear end of the guide channels.

[0009] Optionally, eight sets of induction stakes for positioning are fixedly installed at the rear end of the intermediate bushing; a proximity sensor is fixedly installed at the front end of the rear main shaft frame, and the proximity sensor can detect the passage of the induction stakes.

[0010] Optionally, an unlocking frame is fixedly installed on the top front side of the workbench. The top of the unlocking frame is integrally provided with an unlocking arc plate that curves backward. The bottom of the unlocking arc plate is an arc surface. The two sets of control wheels at the bottom can contact the lower arc surface of the unlocking arc plate. At this time, the unlocking arc plate is forced to move downward towards the control wheels.

[0011] Optionally, a connecting seat is fixedly provided on the rear right side of the mobile motor base, the right side of the connecting seat extends beyond the mobile motor base, and two sets of push rods are fixedly provided at the front end of the right side of the connecting seat; two sets of unlocking rods are fixedly provided on the lower sides of the front end of the mobile motor base.

[0012] Optionally, a feeding rack is fixedly installed at the front center of the top right side of the workbench, and two sets of feeders are fixedly installed above the feeding rack. The top of the feeders is tilted to the right. The upper right side of the feeder is an open structure, the bottom of the feeder is a circular structure, and the lower front and rear sides of the feeder are through-hole structures, with the through-hole structures extending backward. The push rod is located inside the lower rear extension of the feeder. The push rod is aligned with the center of the two rightmost sets of positioning rods.

[0013] Optionally, a discharge guide groove is fixedly provided on the top front middle side of the workbench, and the discharge guide groove is a guide groove that is high in the middle and low on both sides; a through groove is provided outside the equipment compartment to allow the discharge guide groove and the feeder to extend.

[0014] Optionally, a polishing method for a polishing device that automatically switches between clamping piston pins includes the following steps: 1) Feeding: The piston pins are directly filled from the feeder. After the feeder is full, the piston pins accumulate inside the feeder. 2) Feeding: Extend the feed cylinder and push the moving motor base forward. The moving motor base moves forward, driving the polishing motor, push rod, and unlocking rod to move forward. 3) Processing; The push rod moves forward, pushing the piston pin at the bottom inside the feeder forward, opening the two sets of clamping blocks, pushing the piston pin to the outside of the positioning rod, and fitting it on the outside of the positioning rod. At the same time, the spring on the outside of the clamping block provides force to automatically clamp and stabilize the position of the piston pin. The polishing motor moves forward to directly polish the end faces of the two sets of piston pins on the top and polish the edges of the two sets of piston pins on the left. 4) Switching: Start the drive motor to drive the drive gear to rotate, which in turn drives the clamping switching disk to rotate 90 degrees. The proximity sensor and the induction stake work together to assist in positioning. The drive motor is a servo motor, which can stop rotating in time and lock itself. When the two sets of control wheels on the left touch the unlocking arc plate, they automatically move downwards, thereby driving the hinge seat to move. In conjunction with the control linkage, they open the two sets of clamping blocks, retract the clamping blocks into the clamping slot, and unlock the piston pin. When the unlocking lever contacts the two bottom connecting plates, it pushes the connecting plates forward, causing the positioning lever to move forward and pull out the piston pin. At this time, the two bottom piston pins are completely unlocked and fall into the discharge guide groove. 5) Recycling: The piston pin falls into the discharge guide groove and drops to both sides. The recycling can be completed by placing a carrier container in the lower position on both sides of the discharge guide groove beforehand. After recycling is complete, reset the moving motor base and repeat the aforementioned actions to achieve continuous polishing.

[0015] The beneficial effects are as follows: The clamping switching plate provides multi-station flow and synchronous polishing functions for piston pins. The drive motor drives the clamping switching plate to rotate in an indexing manner, which drives the piston pin to the loading, polishing and unloading stations in sequence. With the help of the flat and inner conical polishing wheels, the end face and chamfer polishing are completed in one feed, avoiding clamping errors in multi-process processing, eliminating the risk of scratching the workpiece by secondary clamping, and executing all processing steps synchronously.

[0016] The system is equipped with a feed cylinder and a moving motor base, which provides a synchronous linkage function for polishing feed and loading / unloading. The feed cylinder pushes the moving motor base forward, which in turn drives the polishing motor, push rod and unlocking rod to move. This completes the automatic loading, synchronous polishing and unlocking unloading of the piston pin in one go, eliminating the need for multiple independent drives, simplifying the equipment structure and enabling continuous automated production.

[0017] The system is equipped with an unlocking frame and a sensor positioning component, which provides precise indexing of the workstation and automatic opening and closing of the fixture. The positioning accuracy of the clamping switching plate is ensured by the sensor pile and the proximity sensor. With the contact between the unlocking arc plate and the control wheel, the clamping block is automatically opened to unlock the workpiece. There is no need to set a separate drive for each set of fixtures, which reduces the equipment failure rate. It can be adapted to the processing of piston pins of different specifications and has strong versatility. Attached Figure Description

[0018] Figure 1 A three-dimensional structural schematic diagram of an embodiment of the present invention is shown; Figure 2 A schematic diagram of the conventional state structure of an embodiment of the present invention is shown; Figure 3 An embodiment of the present invention is shown. Figure 2 Another structural diagram from a different angle; Figure 4 An embodiment of the present invention is shown. Figure 2 Side view structural diagram; Figure 5 A schematic diagram of the working state structure of an embodiment of the present invention is shown; Figure 6 An embodiment of the present invention is shown. Figure 5 Another structural diagram from a different angle; Figure 7 A schematic diagram of the internal structure of the clamping switching disk in an embodiment of the present invention is shown; Figure 8 A three-dimensional structural diagram of the switching disk clamping embodiment of the present invention is shown; Figure 9 A schematic diagram of the assembly structure of the guide channel in an embodiment of the present invention is shown; Figure 10 A three-dimensional cross-sectional view of the guide channel in an embodiment of the present invention is shown; Figure 11 A three-dimensional structural schematic diagram of the feeding rack in an embodiment of the present invention is shown.

[0019] List of reference numerals in the attached diagram: 1. Equipment compartment; 2. Workbench; 201. Spindle frame; 202. Main support shaft; 203. Drive motor; 204. Electric cylinder base; 205. Feed electric cylinder; 3. Clamping switching plate; 301. Intermediate bushing; 302. Fixture slot; 303. Limiting slide bar; 304. Clamping block; 305. Control linkage; 306. Hinge seat; 307. Slide frame; 308. Control wheel; 309. Induction stake; 310. Drive gear; 4. Guide channel; 401. Connecting plate; 402. Positioning rod; 5. Unlocking frame; 501. Unlocking arc plate; 6. Moving motor base; 601. Connecting seat; 602. Push rod; 603. Unlocking rod; 7. Polishing motor; 8. Feeding frame; 801. Feeder; 9. Proximity sensor; 10. Discharge guide groove. Detailed Implementation

[0020] To make the objectives, solutions, and advantages of the technical solutions of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of specific embodiments of the present invention.

[0021] Example 1: Please refer to the accompanying drawings in the instruction manual, such as... Figures 1 to 11 As shown: This invention proposes a polishing device and method for automatically switching clamping piston pins, comprising: a device chamber 1, with a worktable 2 fixedly installed inside the device chamber 1; two sets of spindle supports 201 fixedly installed on the top front side and middle of the worktable 2, and a main support shaft 202 fixedly installed between the two sets of spindle supports 201; a clamping switching disk 3, with an integrally installed intermediate bushing 301 in the middle of the clamping switching disk 3, and the clamping switching disk 3 rotatably mounted outside the main support shaft 202; eight evenly distributed clamping grooves 302 are formed around the inside of the clamping switching disk 3, and the outside of each clamping groove 302 extends through the arc edge of the clamping switching disk 3, with openings at the arc edge positions. A through slot is provided; four sets of limiting slide rods 303 are fixedly installed on both sides of the inside of the clamping slot 302, and clamping blocks 304 are slidably installed outside the four sets of limiting slide rods 303 on each side; control linkages 305 are hinged on the side of the clamping block 304 near the center of the clamping switching disk 3, and hinge seats 306 are hinged to the other end of the two sets of control linkages 305; a moving motor seat 6 is slidably installed on the rear side above the top of the worktable 2, and two sets of polishing motors 7 are fixedly installed on the top and left side of the moving motor seat 6. Polishing wheels are fixedly installed on the rotor end of the polishing motors 7, the front end of the two sets of polishing wheels on the top is flat, and the front end of the two sets of polishing wheels on the left is an inner conical surface.

[0022] Among them, a drive gear 310 is fixedly installed on the outer rear side of the intermediate bushing 301; a drive motor 203 is fixedly installed at the front end of the front main spindle frame 201, and a gear is installed at the rotor end of the drive motor 203 to mesh with the drive gear 310; an electric cylinder seat 204 is fixedly installed on the top rear side of the worktable 2, and a feed electric cylinder 205 is fixedly installed at the front end of the electric cylinder seat 204, and the telescopic end of the feed electric cylinder 205 is fixed to the rear side of the moving motor seat 6.

[0023] Springs are provided between the inner walls of both sides of the clamping groove 302 and the clamping block 304. A circular groove for accommodating the springs is also provided in the clamping groove 302. A sliding frame 307 is fixedly provided on the front side of the clamping groove 302. The front end of the hinge seat 306 slides in the sliding frame 307. A control wheel 308 is rotatably provided on the front end of the hinge seat 306.

[0024] Among them, guide channels 4 are fixedly provided at the slotted positions around the front side of the clamping switching disk 3, and connecting plates 401 are slidably provided in the guide channels 4. Springs are provided on the front side of the connecting plates 401. Positioning rods 402 are fixedly provided at the rear end of the connecting plates 401, and the positioning rods 402 extend out of the rear end of the guide channels 4.

[0025] Among them, eight sets of induction stakes 309 for positioning are fixedly installed at the rear end of the intermediate bushing 301; a proximity sensor 9 is fixedly installed at the front end of the rear main shaft frame 201, and the proximity sensor 9 can sense the passage of the induction stakes 309.

[0026] Among them, an unlocking frame 5 is fixedly installed on the front top of the workbench 2. The top of the unlocking frame 5 is integrally provided with an unlocking arc plate 501 that turns backward. The bottom of the unlocking arc plate 501 is an arc surface. The two sets of control wheels 308 at the bottom can contact the lower arc surface of the unlocking arc plate 501. At this time, the unlocking arc plate 501 is forced to move downward towards the control wheels 308.

[0027] Among them, a connecting seat 601 is fixedly installed on the rear right side of the mobile motor base 6, the right side of the connecting seat 601 extends beyond the mobile motor base 6, and two sets of push rods 602 are fixedly installed at the front end of the right side of the connecting seat 601; two sets of unlocking rods 603 are fixedly installed on the lower sides of the front end of the mobile motor base 6.

[0028] Among them, a feeding rack 8 is fixedly installed at the front center of the right side of the top of the workbench 2. Two sets of feeders 801 are fixedly installed above the feeding rack 8. The top of the feeders 801 is tilted to the right. The upper right of the feeder 801 is an open structure. The bottom of the feeder 801 is a circular structure. The lower front and rear sides of the feeder 801 are through holes. The through holes extend backward. The push rod 602 is located in the lower rear extension of the feeder 801. The push rod 602 is aligned with the center of the two rightmost sets of positioning rods 402.

[0029] Among them, a discharge guide groove 10 is fixedly installed on the front middle side of the top of the workbench 2. The discharge guide groove 10 is a guide groove with a high middle and low sides. A through groove is opened on the outside of the equipment compartment 1 to allow the discharge guide groove 10 and the feeder 801 to extend.

[0030] like Figure 9 The clamping switching disk 3 is composed of two sets of spliced ​​components. If cost allows, it can also be made by one-piece casting to improve the accuracy of the clamping switching disk 3.

[0031] One polishing method for an automatic switching polishing device for holding piston pins includes the following steps: 1) Feeding: The piston pins are directly filled from the feeder 801. After the feeder 801 is filled, the piston pins accumulate inside the feeder 801. 2) Feeding: Extend the feed cylinder 205 and push the moving motor base 6 forward. The moving motor base 6 moves forward, driving the polishing motor 7, the push rod 602 and the unlocking rod 603 to move forward. 3) Processing; The push rod 602 moves forward, pushing the piston pin at the bottom inside the feeder 801 forward, opening the two sets of clamping blocks 304, pushing the piston pin to the outside of the positioning rod 402, and fitting it on the outside of the positioning rod 402. At the same time, the spring on the outside of the clamping block 304 provides force to automatically clamp and stabilize the position of the piston pin. The polishing motor 7 moves forward to directly polish the end faces of the two sets of piston pins on the top and polish the edges of the two sets of piston pins on the left. 4) Switching: Start the drive motor 203 to drive the drive gear 310 to rotate, which in turn drives the clamping switching disk 3 to rotate 90 degrees. The proximity sensor 9 and the sensing stake 309 are used to assist in positioning. The drive motor 203 is a servo motor, which can stop rotating in time and self-lock. When the two sets of control wheels 308 on the left side come into contact with the unlocking arc plate 501, they automatically move downwards, thereby driving the hinge seat 306 to move. In conjunction with the control linkage 305, the two sets of clamping blocks 304 are opened, the clamping blocks 304 are put into the clamping slot 302, and the piston pin is unlocked. When the unlocking lever 603 contacts the two bottom sets of connecting plates 401, it pushes the connecting plates 401 forward, causing the positioning lever 402 to move forward and pull out the piston pin. At this time, the two bottom sets of piston pins are completely unlocked and fall into the discharge guide groove 10. 5) Recycling: The piston pin falls into the discharge guide groove 10 and falls to both sides. The collection container can be placed in advance at the lower position on both sides of the discharge guide groove 10 for recycling. After recycling is complete, reset the moving motor base 6 and repeat the aforementioned actions to achieve continuous polishing.

[0032] Example 2: Based on Example 1, the drive motor 203 is a servo motor. The servo motor has a built-in compensation mechanism, which can automatically compensate for errors in the polishing process in conjunction with the operating system. If improved control precision is required, the feed electric cylinder 205 can be replaced with a servo linear slide. The servo linear slide is fixed to the top rear side of the worktable 2 in the front-back direction, and the bottom of the moving motor seat 6 is fixedly installed on the slider of the servo linear slide to achieve control.

[0033] Example 3: Based on Example 1, the polishing equipment only polishes one side of the piston pin. After the piston has been polished on one side, it can be recycled, placed with one end facing backward, and put back into the feeder 801 for re-polishing. The polishing wheel at the front end of the polishing motor 7 can be replaced as needed, and even the angle of the polishing wheel can be customized. For example, the angle of the inner cone can be customized according to the chamfer angle requirements.

Claims

1. A polishing device for automatically switching clamping piston pins, comprising: Equipment compartment (1), wherein a workbench (2) is fixedly installed inside the equipment compartment (1); characterized in that two sets of spindle frames (201) are fixedly installed on the top front side and the middle of the workbench (2), and a main support shaft (202) is fixedly installed between the two sets of spindle frames (201); clamping switching disk (3), wherein an intermediate bushing (301) is integrally installed in the middle of the clamping switching disk (3), and the clamping switching disk (3) is rotatably installed outside the main support shaft (202); eight evenly distributed clamping slots (302) are opened around the inside of the clamping switching disk (3), and the outside of the clamping slots (302) all protrude through the arc edge of the clamping switching disk (3), and a through slot is opened at the arc edge position; Four sets of limiting slide rods (303) are fixedly installed on both sides of the fixture slot (302). Clamping blocks (304) are slidably installed on the outside of the four sets of limiting slide rods (303) on each side. Control linkages (305) are hinged on the side of the clamping block (304) close to the center of the clamping switching disk (3). The other end of the two sets of control linkages (305) is hinged to the hinge seat (306). A moving motor seat (6) is slidably installed on the rear side above the top of the worktable (2). Two sets of polishing motors (7) are fixedly installed on the top and left side of the moving motor seat (6). Polishing wheels are fixedly installed on the rotor end of the polishing motors (7). The front end of the two sets of polishing wheels on the top is flat, and the front end of the two sets of polishing wheels on the left is an inner conical surface.

2. The polishing equipment for automatically switching clamping piston pins as described in claim 1, characterized in that, A drive gear (310) is fixedly installed on the outer rear side of the intermediate bushing (301); a drive motor (203) is fixedly installed at the front end of the front main shaft frame (201), and a gear is installed at the rotor end of the drive motor (203) to mesh with the drive gear (310); an electric cylinder seat (204) is fixedly installed on the top rear side of the worktable (2), and a feed electric cylinder (205) is fixedly installed at the front end of the electric cylinder seat (204), and the telescopic end of the feed electric cylinder (205) is fixed on the rear side of the moving motor seat (6).

3. The polishing equipment for automatically switching clamping piston pins as described in claim 1, characterized in that, Springs are provided between the inner walls of both sides of the clamping groove (302) and the clamping block (304). A circular groove for accommodating the spring is also provided in the clamping groove (302). A sliding frame (307) is fixedly provided on the front side of the clamping groove (302). The front end of the hinge seat (306) slides in the sliding frame (307). A control wheel (308) is also rotatably provided on the front end of the hinge seat (306).

4. The polishing equipment for automatically switching clamping piston pins as described in claim 1, characterized in that, The clamping switching disk (3) has a guide channel (4) fixedly installed around the front side of the slotted position. A connecting plate (401) is slidably installed in the guide channel (4). A spring is installed on the front side of the connecting plate (401). A positioning rod (402) is fixedly installed at the rear end of the connecting plate (401). The positioning rod (402) passes through the rear end of the guide channel (4).

5. The polishing equipment for automatically switching clamping piston pins as described in claim 1, characterized in that, The rear end of the intermediate bushing (301) is fixedly provided with eight sets of induction stakes (309) for positioning; the front end of the rear main shaft frame (201) is fixedly provided with a proximity sensor (9), which can sense the passage of the induction stakes (309).

6. The polishing equipment for automatically switching clamping piston pins as described in claim 3, characterized in that, The workbench (2) is fixedly provided with an unlocking frame (5) on the top front side. The top of the unlocking frame (5) is integrally provided with an unlocking arc plate (501) that turns backward. The bottom of the unlocking arc plate (501) is an arc surface. The two sets of control wheels (308) at the bottom can contact the lower arc surface of the unlocking arc plate (501). At this time, the unlocking arc plate (501) is forced to move down towards the control wheels (308).

7. The polishing device for automatically switching clamping piston pins as described in claim 4, characterized in that, A connecting seat (601) is fixedly installed on the rear right side of the mobile motor base (6). The right side of the connecting seat (601) extends beyond the mobile motor base (6). Two sets of push rods (602) are fixedly installed at the front end of the right side of the connecting seat (601). Two sets of unlocking rods (603) are fixedly installed on the lower sides of the front end of the mobile motor base (6).

8. The polishing device for automatically switching clamping piston pins as described in claim 7, characterized in that, A feeding rack (8) is fixedly installed at the front center of the right side of the top of the workbench (2). Two sets of feeders (801) are fixedly installed above the feeding rack (8). The feeders (801) are all tilted to the right. The upper right of the feeder (801) is an open structure. The bottom of the feeder (801) is a circular structure. The lower front and rear sides of the feeder (801) are through holes. The through holes extend backward. The push rod (602) is located in the lower rear extension of the feeder (801). The push rod (602) is aligned with the center of the two rightmost positioning rods (402).

9. The polishing equipment for automatically switching clamping piston pins as described in claim 8, characterized in that, The top front middle side of the workbench (2) is fixedly provided with a discharge guide groove (10), which is a guide groove with a high middle and low sides; the equipment compartment (1) is provided with a through groove that allows the discharge guide groove (10) and the feeder (801) to extend out.

10. The polishing method of the polishing equipment for automatically switching clamping piston pins as described in any one of claims 1-9, characterized in that, Includes the following steps: 1) Feeding: The piston pins are directly filled from the feeder (801). After the feeder (801) is filled, the piston pins accumulate inside the feeder (801). 2) Feeding: Extend the feed cylinder (205) and push the moving motor base (6) forward. The moving motor base (6) moves forward, driving the polishing motor (7), the push rod (602), and the unlocking rod (603) to move forward. 3) Processing; The push rod (602) moves forward, pushing the piston pin at the bottom inside the feeder (801) forward, opening the two sets of clamping blocks (304), pushing the piston pin to the outside of the positioning rod (402), and sleeved on the outside of the positioning rod (402). At the same time, the spring on the outside of the clamping block (304) provides force to automatically clamp and stabilize the position of the piston pin. The polishing motor (7) moves forward and directly polishes the end faces of the two sets of piston pins on the top and polishes the edges of the two sets of piston pins on the left. 4) Switching: Start the drive motor (203) to drive the drive gear (310) to rotate, which in turn drives the clamping switching disk (3) to rotate 90 degrees. The proximity sensor (9) and the sensing stake (309) are used to assist in positioning. The drive motor (203) is a servo motor, which can stop rotating in time and self-lock. When the two sets of control wheels (308) on the left side come into contact with the unlocking arc plate (501), they automatically move downwards, thereby driving the hinge seat (306) to move, and cooperating with the control linkage (305) to open the two sets of clamping blocks (304), and put the clamping blocks (304) into the clamping slot (302) to unlock the piston pin; When the unlocking lever (603) contacts the two bottom connecting plates (401), the connecting plates (401) are pushed forward, causing the positioning lever (402) to move forward and pull out the piston pin. At this time, the two bottom piston pins are completely unlocked and fall into the discharge guide groove (10). 5) Recycling: The piston pin falls into the discharge guide groove (10) and falls to both sides. The carrier container is placed in advance at the lower position on both sides of the discharge guide groove (10) for recycling. After recycling is completed, reset the moving motor base (6) and repeat the above actions to achieve continuous polishing.

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