Pneumatic PSC quick-change positioning zero point system

Abstract

The invention discloses a pneumatic PSC quick-change positioning zero point system which comprises a shell structure, one end of the shell structure is used for clamping a PSC connecting handle, a clamping mechanism is coaxially and movably arranged in the shell structure, the clamping mechanism can unlock or lock the PSC connecting handle through axial movement, and a guide groove is formed in the side wall of the clamping mechanism; the clamping mechanism is movably arranged in the shell structure and symmetrically arranged on the two sides of the clamping mechanism, the side wall, close to the clamping mechanism, of the clamping mechanism is provided with a pushing part, and the clamping mechanism comprises a clamping piece; the clamping mechanism moves towards the direction close to the second end, so that the clamping piece enters the guide groove and is extruded by the pushing part, the clamping mechanism is made to be close to the second end, the clamping mechanism is limited to lock the PSC connecting handle, rapid locking is achieved, and enough clamping force is guaranteed. The clamping mechanism moves towards the direction close to the first end, the pushing part is far away from the clamping piece, the clamping piece is separated from the guide groove, the clamping mechanism is not limited any more, rapid unlocking is achieved, and the PSC connecting handle is convenient to disassemble.

Description

Technical Field

[0001] This disclosure relates to the field of machining fixture technology, specifically to a pneumatic PSC quick-change positioning zero-point system. Background Technology

[0002] Currently, zero-point positioning systems are mainly divided into mechanical, hydraulic, and electric types. However, mechanical zero-point positioning (such as tapered pin + pull stud structure) relies on manual operation, has a long changeover time (usually >30 seconds), and its repeatability is affected by wear (accuracy drops to ±0.02mm or more after long-term use). Hydraulic zero-point positioning requires a hydraulic station, making the system complex and posing a risk of oil leakage; it also has high maintenance costs and is not suitable for clean production environments. Electric zero-point positioning (such as servo drive) has a slow response speed (clamping time >5 seconds) and is also expensive.

[0003] While traditional pneumatic clamps have the advantages of fast response and cleanliness, they have drawbacks such as insufficient clamping force and unstable clamping force (±10% deviation) caused by air pressure fluctuations, which affect the rigidity of the machining process.

[0004] To achieve rapid device changeover, ensure repeatability and provide reliable clamping force, we propose a pneumatic PSC quick-change positioning zero-point system. Summary of the Invention

[0005] In view of the above-mentioned defects or deficiencies in the prior art, it is desirable to provide a pneumatic PSC quick-change positioning zero-point system.

[0006] In a first aspect, this application provides a pneumatic PSC quick-change positioning zero-point system, comprising: The outer shell structure has a first end and a second end at its two ends, the first end being used to mount the PSC connector and the second end being used to mount it on the machine tool. A clamping mechanism is coaxially and movably disposed inside the housing structure. The clamping mechanism moves axially to unlock or lock the PSC handle. A guide groove is provided on the side wall of the clamping mechanism. A clamping mechanism is movably disposed inside the housing structure and is symmetrically arranged on both sides of the clamping mechanism. The clamping mechanism has a pushing part on the side wall near the clamping mechanism and includes a clamping element. When the PSC handle is locked, the clamping mechanism moves toward the second end, pushes the clamping member into the guide groove and is squeezed by the pushing part, so that the clamping mechanism is close to the second end and is limited to lock the PSC handle. When the PSC handle is unlocked, the clamping mechanism moves toward the first end, the pushing part disengages from the clamping member, the clamping member disengages from the guide groove, and the clamping mechanism moves toward the first end to unlock the PSC handle.

[0007] According to the technical solution provided in the embodiments of this application, the outer shell structure includes: The housing has a first end and a second end at its two ends, respectively. A clamping space is coaxially arranged inside the housing to accommodate the clamping mechanism. Pneumatic spaces are symmetrically arranged on both sides of the clamping space inside the housing to accommodate the clamping mechanism. A communication port is provided inside the housing to connect the clamping space and the pneumatic space and to accommodate the clamping component. An interface sleeve is coaxially disposed at the first end and is used to hold the PSC connector.

[0008] According to the technical solution provided in the embodiments of this application, the clamping mechanism further includes: A piston is movably disposed within the pneumatic space and divides the pneumatic space into two mutually sealed cavities. A first elastic element is disposed within the cavity, with its axis parallel to the axis of the outer shell structure. Both ends of the first elastic element abut against the inner wall of the cavity and the piston, respectively.

[0009] According to the technical solution provided in the embodiments of this application, the pushing part is disposed on the side wall of the piston near the clamping space, and the side wall of the piston near the clamping space also has a receiving part, which is used to receive the clamping member when the PSC handle is unlocked.

[0010] According to the technical solution provided in the embodiments of this application, a rear cover is provided at the second end of the housing to close the second end, and the third cavity is formed between the rear cover and the clamping mechanism. A connecting channel is also provided inside the outer shell structure to connect the third cavity and the second cavity. Inside the housing, a first air intake space is provided on the side of one of the pneumatic spaces away from the clamping space. The first air intake space is connected to the outside through an air passage and is used to connect to an external air source. The first air intake space is also connected to the second cavity. Inside the housing, on the side away from the clamping space of another pneumatic space, there is a second air intake space. The second air intake space is connected to the outside through the second air passage and is used to connect to an external air source. The second air intake space is also connected to the first cavity.

[0011] According to the technical solution provided in the embodiments of this application, the clamping mechanism includes: A pull rod having a locking section and a clamping section fixedly connected, the locking section being closer to the second end relative to the clamping section, and the guide groove being disposed on the side wall of the locking section, and the side wall of the clamping section being provided with a guide portion; A clamping assembly is sleeved on the clamping section and moves toward the second end via the pull rod. The clamping assembly cooperates with the guide portion and switches to an open state to clamp the PSC handle.

[0012] According to the technical solution provided in the embodiments of this application, the clamping assembly includes: An expansion ring, the expansion ring including a plurality of pull claws distributed circumferentially along the clamping section, the pull claws having clamping protrusions on the outer wall near the first end; A sealing ring is fitted onto the end of the pull claw near the second end to prevent the multiple pull claws from expanding. A retaining ring, wherein the retaining ring is sleeved on one end of the expansion ring near the second end; A retaining ring, wherein the retaining ring is sleeved on the retaining ring; The second elastic element is sleeved on the clamping section and is located on the side of the expansion ring closer to the second end.

[0013] According to the technical solution provided in the embodiments of this application, the inner wall of the PSC handle is provided with a clamping recess that matches the clamping protrusion.

[0014] According to the technical solution provided in the embodiments of this application, both the piston and the pull rod are provided with sealing elements.

[0015] In summary, this technical solution specifically discloses a pneumatic PSC quick-change positioning zero-point system, including a housing structure with a first end and a second end at its two ends. The first end is used to mount the PSC handle, and the second end is used to mount it on a machine tool. A clamping mechanism is coaxially and movably disposed inside the housing structure. The axial movement of the clamping mechanism can unlock or lock the PSC handle, and the side wall of the clamping mechanism is provided with a guide groove. A locking mechanism is movably disposed inside the housing structure and is symmetrically arranged on both sides of the clamping mechanism. The locking mechanism has a pushing part on the side wall near the clamping mechanism, and the locking mechanism includes a locking element. The clamping mechanism moves towards the second end, causing the clamping element to enter the guide groove and be squeezed by the pushing part, thereby bringing the clamping mechanism closer to the second end and limiting the clamping mechanism to lock the PSC handle, achieving rapid locking and ensuring sufficient clamping force. The clamping mechanism moves towards the first end, the pushing part moves away from the clamping part, the clamping part disengages from the guide groove, and no longer limits the clamping mechanism, thus achieving quick unlocking and facilitating the disassembly of the PSC handle. Attached Figure Description

[0016] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 This is a cross-sectional view of a pneumatic PSC quick-change positioning zero-point system.

[0017] Figure 2 for Figure 1 Enlarged view of point A in the middle.

[0018] Figure 3 This is a front view of a pneumatic PSC quick-change positioning zero-point system.

[0019] The following are the labeling elements in the diagram: 1. PSC handle; 2. Guide groove; 3. Pushing part; 4. Clamping part; 5. Housing; 6. Connecting port; 7. Interface sleeve; 8. Piston; 9. Cavity 1; 10. Cavity 2; 11. First elastic element; 12. Receiving part; 13. Rear cover; 14. Cavity 3; 15. Connecting channel; 16. First air intake space; 17. Air passage 1; 18. Second air intake space; 19. Air passage 2; 20. Pull rod; 21. Pull claw; 22. Sealing ring; 23. Retaining ring; 24. Snap ring; 25. Second elastic element; 26. Sealing element. Detailed Implementation

[0020] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0021] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0022] Example 1 Zero Point Clamping (ZPC) is a rapid positioning technology used in machining, fixture design, and automated manufacturing. Its core purpose is to achieve rapid, accurate, and repeatable positioning of workpieces, fixtures, or tools on machine tool tables through standardized interfaces, reducing clamping time and improving production efficiency.

[0023] Please refer to Figures 1 to 3 As shown, a pneumatic PSC quick-change positioning zero-point system includes: The outer shell structure has a first end and a second end at its two ends. The first end is used to mount the PSC connector 1, and the second end is used to mount it on the machine tool. The outer shell structure has a clamping space coaxial with it. The outer shell structure has pneumatic spaces symmetrically arranged on both sides of the clamping space. The outer shell structure also has a connecting port 6 for connecting the pneumatic space and the clamping space. The clamping mechanism is movably disposed within the clamping space, and the axial movement of the clamping mechanism is used to unlock or lock the PSC handle 1; The clamping mechanism is movably disposed within the pneumatic space, dividing the pneumatic space into two mutually sealed cavities, 9 and 10, with cavity 9 being closer to the first end. The clamping mechanism includes a clamping element 4, which is movably disposed within the communication port 6. The clamping element 4 can be a steel ball. The clamping mechanism has a pushing part 3 on the side wall near the clamping mechanism, and the clamping mechanism has a guide groove 2 on the side wall; The outer shell structure also includes a cavity 314, which is located within the clamping space; Therefore, when it is necessary to lock the PSC handle 1, the PSC handle 1 is manually picked up and installed. The end of the clamping mechanism near the first end extends into the interior of the PSC handle 1. Air is injected into the cavity 9, causing the clamping mechanism to move towards the second end. During this process, the clamping member 4 is pushed to move and enter the communication port 6. Under the pushing action of the pushing part 3, a part of the clamping member 4 near the clamping mechanism enters the guide groove 2 and cooperates with the inner wall of the guide groove 2, providing pressure to the clamping mechanism towards the second end. The clamping mechanism moves towards the second end. Finally, the clamping member 4 circumferentially abuts against the inner wall of the guide groove 2, the inner wall of the communication port 6, and the pushing part 3, which can limit the clamping mechanism and prevent it from displacing, ensuring that it can quickly clamp the PSC handle 1. When it is necessary to unlock the PSC handle 1, air is injected into the second cavity 10, causing the clamping mechanism to move closer to the first end. The pushing part 3 moves away from the clamping member 4 and no longer squeezes the clamping member 4. At this time, the second cavity 10 and the third cavity 14 are connected, and air enters the third cavity 14, causing the clamping mechanism to move closer to the first end. The clamping member 4 and the guide groove 2 cooperate, and the inner wall of the guide groove 2 guides the clamping member 4. The clamping member 4 disengages from the guide groove 2 and no longer applies pressure to the clamping mechanism, thereby realizing the quick unlocking of the PSC handle 1.

[0024] The outer shell structure includes: The housing 5 has a first end and a second end at its two ends, respectively. Interface sleeve 7 is coaxially fixed at the first end and is used to mount PSC connector 1. The clamping space is coaxially arranged inside the housing 5, and the two ends of the clamping space are respectively connected to the first end and the second end. The interface sleeve 7 extends from the first end into the clamping space, and the interface sleeve 7 has a through opening along its axis and is connected to the clamping space. Therefore, the PSC handle 1 can extend into the clamping space and be locked and unlocked by the clamping mechanism. The pneumatic space is located inside the housing 5, and the end of the pneumatic space near the second end is connected to the second end, so the end of the pneumatic space near the second end is open; The housing structure also includes a rear cover 13 for closing the second end, and since the clamping mechanism is located in the clamping space, a cavity 14 is formed between the rear cover 13 and the clamping mechanism.

[0025] The clamping mechanism also includes: Piston 8 is movably disposed within the pneumatic space and divides the pneumatic space into two mutually sealed cavities, 9 and 10. The first elastic element 11 is disposed in the cavity 9. The axis of the first elastic element 11 is parallel to the axis of the outer shell structure. The two ends of the first elastic element 11 abut against the inner wall of the cavity 9 and the piston 8, respectively. The first elastic element 11 can be a spring. Limiting grooves are provided on the side wall of the piston 8 near the first elastic member 11 and on the side wall of the housing 5 corresponding to the first elastic member 11, to limit the first elastic member 11 and ensure that the extension and retraction direction of the first elastic member 11 is only parallel to the axis of the housing 5. The piston 8 has a pushing part 3 and a receiving part 12 on the side wall near the clamping mechanism. The receiving part 12 is closer to the second end than the pushing part 3. A guide slope is formed between the pushing part 3 and the receiving part 12 to guide the clamping member 4 into the communication port 6 when the piston 8 moves towards the second end. The housing 5 also has a connecting channel 15 for connecting cavity 3 14 and cavity 2 10; Therefore, when it is necessary to lock the PSC handle 1, the PSC handle 1 is manually picked up and installed. One end of the PSC handle 1 extends into the clamping space and accommodates the end of the clamping structure near the first end. By inflating the cavity 9, the air pressure in the cavity 9 increases, causing the piston 8 to move towards the second end. The piston 8 blocks the connecting channel 15. The clamping member 4 is guided to the connecting port 6 by the guide slope, and the pushing part 3 abuts against the clamping member 4. At the same time, the clamping member 4 cooperates with the guide groove 2 of the clamping mechanism to limit the clamping mechanism and clamp the PSC handle 1. When it is necessary to unlock the PSC handle 1, by inflating the second cavity 10, the air pressure inside the second cavity 10 increases, causing the piston 8 to move closer to the first end, and aligning the receiving part 12 with the connecting port 6. The piston 8 no longer blocks the connecting channel 15, and the third cavity 14 and the second cavity 10 are connected through the connecting channel 15. Gas enters the third cavity 14, causing the clamping mechanism to move closer to the first end. Through the cooperation of the guide groove 2 and the locking member 4, the locking member 4 is guided and pushed away from the clamping mechanism and comes into contact with the receiving part 12. At this point, the clamping mechanism is no longer limited. By moving the clamping mechanism closer to the first end, the PSC handle 1 is unlocked.

[0026] Inside the outer shell structure, a first air intake space 16 is provided on the side of one of the pneumatic spaces away from the clamping space. The first air intake space 16 is connected to the outside through air passage 17 and is used to connect to an external air source. When the PSC handle 1 is unlocked, air is supplied to the first air intake space 16 through the external air source. The gas enters the second cavity 10 and pushes the piston 8 to move towards the first end. The piston 8 no longer blocks the connecting passage 15, so that the second cavity 10 and the third cavity 14 are connected. The clamping mechanism moves towards the first end, thereby unlocking the PSC handle 1. Inside the outer shell structure, a second air intake space 18 is provided on the side away from the clamping space in another pneumatic space. The second air intake space 18 is connected to the outside through the second air passage 19 and is used to connect to an external air source. The second air intake space 18 is also connected to the first cavity 9. When the PSC handle 1 is locked, air is supplied to the second air intake space 18 through the external air source. The gas enters the first cavity 9, causing the piston 8 to move towards the second end and block the connecting passage 15.

[0027] The clamping mechanism includes: The pull rod 20 has a locking section and a clamping section that are fixedly connected. The locking section is closer to the second end than the clamping section, and the guide groove 2 is provided on the side wall of the locking section. The side wall of the clamping section is provided with a guide part. The clamping assembly is sleeved on the clamping section and moves towards the second end via the pull rod 20. The clamping assembly and the guide part cooperate to switch to the open state to clamp the PSC handle 1. The clamping section of the pull rod 20 has a guide section on the side wall away from the clamping section. The guide section is inclined. When the pull rod 20 moves towards the second end, the inclined guide section can open one end of the clamping assembly, switch it to the open state, and thus clamp the PSC handle 1. Furthermore, the clamping assembly includes: The expansion ring includes a plurality of pull claws 21 distributed circumferentially along the clamping section, and the outer wall of the pull claws 21 near the first end is provided with clamping protrusions; A sealing ring 22 is fitted onto the end of the pull claw 21 near the second end to prevent the multiple pull claws 21 from expanding. Retaining ring 23 is sleeved on the end of the expansion ring near the second end; Snap ring 24 is sleeved on retaining ring 23; The second elastic element 25 is sleeved on the clamping section and is located on the side of the expansion ring closer to the second end; the type of the second elastic element 25 can be a wave spring. The expansion ring is composed of multiple pull claws 21 distributed circumferentially. A groove is provided on the side wall of the pull claw 21 near the second end, and a sealing ring 22 is provided in the groove. Thus, the sealing ring 22 can fit around the multiple pull claws 21 to prevent them from falling apart. A connecting protrusion is also provided on the side wall of the pull claw 21 near the second end, and the retaining ring 23 is sleeved on the connecting protrusion. Optionally, the retaining ring 23 can be two mating semi-circular structures. The outer wall of the retaining ring 23 is provided with a groove, and the retaining spring 24 is disposed in the groove. Thus, the retaining spring can limit the retaining ring 23 and prevent the expansion ring from falling off. Furthermore, one end of the PSC handle 1 is provided with a receiving groove, and the inner wall of the receiving groove is provided with a clamping recess that matches the clamping protrusion. Therefore, when the clamping mechanism moves towards the second end, specifically, the pull rod 20 moves towards the second end and, through the inclined guide portion on the clamping section, engages with the end of the pull claw 21 near the first end, thereby causing the expansion ring to switch to the open state, and the clamping protrusion is squeezed into the clamping recess, thereby locking the PSC handle 1; correspondingly, when the pull rod 20 moves towards the first end, the clamping protrusion is no longer squeezed and disengages from the clamping recess, thereby unlocking the PSC handle 1.

[0028] It should be noted that, in order to ensure the sealing of cavity 1 9, cavity 2 10 and cavity 3 14, a sealing element 26 is provided on piston 8 and pull rod 20. The sealing element 26 can be a rubber sealing ring.

[0029] Working principle: When the PSC handle 1 is locked, the piston 8 blocks the connecting channel 15, and the clamping protrusion is squeezed into the clamping recess by the pull rod 20. When it is necessary to unlock the PSC handle, air is injected into the first air intake space 16 through an external air source. The gas enters the second cavity 10, pushing the piston 8 closer to the first end, thereby compressing the first elastic element 11. The pushing part 3 of the piston 8 no longer pushes the clamping element 4, and the receiving part 12 aligns with the connecting port 6. At the same time, the piston 8 no longer blocks the connecting channel 15, and the gas enters the third cavity 14, pushing... When the pull rod 20 approaches the first end, the clamping member 4 and the guide groove 2 cooperate to disengage the clamping member 4 from the guide groove 2 and move to the receiving part 12. The pull rod 20 continues to move, and the retaining ring 23 will abut against the interface sleeve 7. Through the movement of the pull rod 20, both the pull rod 20 and the retaining ring 23 compress the second elastic member 25. At the same time, the clamping section no longer squeezes the clamping protrusion, and it disengages from the clamping recess. Thus, the PSC handle 1 is unlocked, so that the operator can disassemble the PSC handle 1 and release the gas after disassembly. When it is necessary to lock the PSC handle 1, first insert the PSC handle 1 into the first end. The end of the pull rod 20 near the first end and the end of the pull claw 21 with the clamping protrusion both extend into the receiving groove of the PSC handle 1. Inflate the second air intake space 18 through the external air source. The gas enters the cavity 9 and pushes the piston 8 near the second end. Through the guide slope formed between the pushing part 3 and the receiving part 12, the clamping member 4 enters the connecting port 6 and contacts the inner wall of the guide groove 2, thereby entering the guide groove 2. The circumferential side wall of the clamping member 4 can abut against the inner wall of the connecting port 6, the inner wall of the guide groove 2 and the pushing part 3 to limit the pull rod 20. During this process, through the guide part in the form of the slope on the clamping section, which cooperates with the end of the pull claw 21 near the first end, the expansion ring is switched to the open state, and the clamping protrusion is squeezed into the clamping recess, thereby locking the PSC handle 1.

[0030] The above description is merely a preferred embodiment of the present application and an illustration of the technical principles employed. Those skilled in the art should understand that the scope of the invention herein is not limited to the technical solutions formed by the specific combination of the above-mentioned technical features, but also encompasses other technical solutions formed by any combination of the above-mentioned technical features or their equivalents without departing from the inventive concept. For example, a technical solution formed by replacing the above-mentioned features with (but not limited to) technical features having similar functions disclosed in this application.

Claims

1. A pneumatic PSC quick-change positioning zero-point system, characterized in that, include: The outer shell structure has a first end and a second end at its two ends, the first end being used to mount the PSC connector (1) and the second end being used to mount it on the machine tool. A clamping mechanism is coaxially and movably disposed inside the housing structure. The clamping mechanism moves axially to unlock or lock the PSC handle (1). A guide groove (2) is provided on the side wall of the clamping mechanism. The clamping mechanism is movably disposed inside the outer shell structure and is symmetrically arranged on both sides of the clamping mechanism. The clamping mechanism has a pushing part (3) on the side wall near the clamping mechanism and includes a clamping element (4). When the PSC handle (1) is locked, the clamping mechanism moves toward the second end, pushes the clamping member (4) into the guide groove (2) and is squeezed by the pushing part (3), so that the clamping mechanism moves closer to the second end and limits the clamping mechanism to lock the PSC handle. When the PSC handle (1) is unlocked, the clamping mechanism moves toward the first end, the pushing part (3) disengages from the clamping member (4), the clamping member (4) disengages from the guide groove (2), and the clamping mechanism moves toward the first end to unlock the PSC handle (1).

2. The pneumatic PSC quick-change positioning zero-point system according to claim 1, characterized in that, The outer shell structure includes: The housing (5) has a first end and a second end at its two ends, respectively. A clamping space is coaxially arranged inside the housing (5) to accommodate the clamping mechanism. Pneumatic spaces are symmetrically arranged on both sides of the clamping space inside the housing (5) to accommodate the clamping mechanism. A connecting port (6) is provided inside the housing (5) to connect the clamping space and the pneumatic space and to accommodate the clamping member (4). Interface sleeve (7), which is coaxially disposed at the first end, is used to mount the PSC handle (1).

3. A pneumatic PSC quick-change positioning zero-point system according to claim 2, characterized in that, The clamping mechanism also includes: Piston (8), which is movably disposed in the pneumatic space and divides the pneumatic space into a mutually sealed cavity one (9) and a cavity two (10). The first elastic element (11) is disposed in the cavity (9). The axis of the first elastic element (11) is parallel to the axis of the outer shell structure. The two ends of the first elastic element (11) abut against the inner wall of the cavity (9) and the piston (8), respectively.

4. A pneumatic PSC quick-change positioning zero-point system according to claim 3, characterized in that, The pushing part (3) is disposed on the side wall of the piston (8) near the clamping space, and the piston (8) also has a receiving part (12) on the side wall near the clamping space, the receiving part (12) being used to receive the clamping member (4) when the PSC handle (1) is unlocked.

5. A pneumatic PSC quick-change positioning zero-point system according to claim 2, characterized in that, The second end of the housing (5) is provided with a rear cover (13) for closing the second end. The rear cover (13) and the clamping mechanism form the third cavity (14). The outer shell structure is also provided with a connecting channel (15) for connecting the third cavity (14) and the second cavity (10). The housing (5) has a first air intake space (16) located on the side of one of the pneumatic spaces away from the clamping space. The first air intake space (16) is connected to the outside through air passage one (17) for connecting to an external air source. The first air intake space (16) is also connected to the cavity two (10). The housing (5) has a second air intake space (18) located on the side of another pneumatic space away from the clamping space. The second air intake space (18) is connected to the outside through the second air passage (19) and is used to connect to an external air source. The second air intake space (18) is also connected to the first cavity (9).

6. A pneumatic PSC quick-change positioning zero-point system according to claim 3, characterized in that, The clamping mechanism includes: A pull rod (20) has a locking section and a clamping section that are fixedly connected. The locking section is closer to the second end than the clamping section, and the guide groove (2) is provided on the side wall of the locking section. The side wall of the clamping section is provided with a guide portion. A clamping assembly is sleeved on the clamping section and moves toward the second end via the pull rod (20). The clamping assembly and the guide part cooperate to switch to the open state to clamp the PSC handle (1).

7. A pneumatic PSC quick-change positioning zero-point system according to claim 6, characterized in that, The clamping assembly includes: An expansion ring, the expansion ring including a plurality of pull claws (21) distributed circumferentially along the clamping section, the pull claws (21) having clamping protrusions on their outer walls near the first end; A sealing ring (22) is fitted onto one end of the pull claw (21) near the second end to prevent the multiple pull claws (21) from expanding. A retaining ring (23) is sleeved on one end of the expansion ring near the second end; A retaining ring (24) is sleeved on the retaining ring (23); The second elastic element (25) is sleeved on the clamping section and is located on the side of the expansion ring closer to the second end.

8. A pneumatic PSC quick-change positioning zero-point system according to claim 7, characterized in that, The inner wall of the PSC handle (1) is provided with a clamping recess that matches the clamping protrusion.

9. A pneumatic PSC quick-change positioning zero-point system according to claim 6, characterized in that, Both the piston (8) and the pull rod (20) are provided with seals (26).

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