Airtight detection device and detection method for pneumatic actuator

Abstract

The application discloses a kind of pneumatic actuator air-tight detection device and operating method, including base and the clamping mechanism connected to base, and clamping mechanism includes two sliding blocks, two push-pull plates, two moving plates, two clamps, multiple springs one, multiple spring one is connected between clamp and moving plate, the two ends of the push-pull plate are connected with sliding block, moving plate, the sliding block is connected with the drive mechanism for driving sliding block reciprocating movement, the drive mechanism includes electric push rod, drive plate, two L-shaped rods, the two ends of the L-shaped rod are connected with drive plate, sliding block, the power output end of the electric push rod is connected with drive plate, the drive plate is connected with the compression mechanism for compressing actuator body.The application can realize pneumatic actuator centering processing, realize comprehensive compression to pneumatic actuator, high stability, facilitate subsequent detection, while avoiding gas leakage during testing, flexible operation, strong practicality.

Description

Technical Field

[0001] This invention relates to the field of pneumatic actuator manufacturing technology, specifically to a pneumatic actuator airtightness testing device and testing method. Background Technology

[0002] A pneumatic actuator is an actuating device that uses air pressure to open, close, or regulate valves. It is also called a pneumatic actuator mechanism or pneumatic device, but is commonly referred to as a pneumatic head. Pneumatic actuators are sometimes equipped with auxiliary devices, commonly including valve positioners and handwheel mechanisms. The function of a valve positioner is to use feedback principles to improve the performance of the actuator, enabling it to achieve accurate positioning according to the control signal from the controller. The function of a handwheel mechanism is to directly operate the control valve to maintain normal production when the control system is affected by power outages, air supply interruptions, controller output failure, or actuator malfunction. During the production of pneumatic actuators, airtightness testing is usually required to ensure safety.

[0003] The application, numbered 202223453799.9 and titled "A Pneumatic Actuator Airtightness Testing Device," describes a process where "the pneumatic actuator 5 to be tested is placed on the base 2 and positioned by the side positioning plate 11 and the end positioning block 13. The double piston rod cylinder 3 drives the slider 4 to approach the pneumatic actuator 5 and inserts the plug 7 into the air hole 8 on the pneumatic actuator 5. The airtightness tester 1 then operates, passing air through the hose 9, plug 7, and air hole 8 into the pneumatic actuator 5 for airtightness testing. The pressure value detected by the airtightness tester 1 is used to determine whether there is a leak." However, this requires manually moving the pneumatic actuator 5 to align it with the side positioning plate 11 and the positioning block 13 to ensure the alignment of the air hole 6 and the plug 7. This operation is laborious and time-consuming, and the pressure of the injected gas is usually high. The sealing between the two components needs improvement, potentially leading to leakage and resulting in inaccurate test data. Summary of the Invention

[0004] The purpose of this invention is to provide a pneumatic actuator airtightness testing device and testing method, which has the advantages of enabling pneumatic actuator centering, achieving full compression of the pneumatic actuator, high stability, facilitating subsequent testing, avoiding gas leakage during testing, and flexible and convenient operation, thus solving the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a pneumatic actuator airtightness detection device, comprising a base and a clamping mechanism connected to the base, the clamping mechanism being used to clamp both sides of the actuator body, and the clamping mechanism comprising two sliding blocks, two push-pull plates, two moving plates, two clamping plates, and multiple springs, the multiple springs being connected between the clamping plates and the moving plates, the two ends of the push-pull plates being connected to the sliding blocks and the moving plates, the sliding blocks being connected to a drive mechanism for driving the sliding blocks to reciprocate, the drive mechanism comprising an electric push rod, a drive plate, and two L-shaped rods. The two ends of the L-shaped rod are connected to the drive plate and the sliding block. The power output end of the electric push rod is connected to the drive plate. The drive plate is connected to a clamping mechanism for clamping the actuator body. The clamping mechanism includes a pressing cylinder, a pressing column, and a second spring. The second spring is used to drive the pressing column to move away from the pressing cylinder. The end of the pressing column is inserted into the pressing cylinder. A plug is connected to one side of the drive plate. The plug is connected to a rubber port, and the plug matches the air hole. The pressing cylinder is connected to a clamping mechanism for clamping the rubber port. A side plate is fixed to the top of the base.

[0006] When the pneumatic actuator is in the positioning state, the rear end of the actuator body is attached to the side plate, the two clamps are pressed against the two sides of the actuator body, the pressing column is pressed against the front end of the actuator body, the air hole is inserted into the rubber port and connected to the plug, and the clamping mechanism is clamped in the rubber port.

[0007] Preferably, the two ends of the push-pull plate are connected to the moving plate and the sliding block via shafts.

[0008] Preferably, the top of the base is provided with two sliding grooves 2, two sliding grooves 1, and a sliding groove 3. The clamping plate and the moving plate are slidably connected to the corresponding sliding groove 1, the driving plate is slidably connected to the sliding groove 3, and the sliding block is slidably connected to the sliding groove 2.

[0009] Preferably, a guide post is connected inside the second slide groove, the guide post passes through the sliding block, and a spring three is sleeved on the guide post, the two ends of the spring three being connected to the ends of the sliding block and the second slide groove.

[0010] Preferably, the pressing mechanism further includes an inner cavity and a guide block. The inner cavity is disposed inside the pressing cylinder, the guide block is slidably connected to the inner cavity, the end of the pressing column is fixedly connected to the guide block, and the pressing cylinder is fixed to one side of the drive plate.

[0011] Preferably, the second spring is located inside the inner cavity, and both ends of the second spring are connected to the guide block and the pressing cylinder.

[0012] Preferably, the clamping mechanism includes a telescopic rod, a movable seat, an oblique hole, a sliding column, an L-shaped plate, and an arc-shaped pressure plate. The telescopic rod is used to guide the movable seat. The oblique hole is disposed in the movable seat. The sliding column is slidably connected to the oblique hole. The two ends of the L-shaped plate are connected to the pressing column and the sliding column. The arc-shaped pressure plate is fixed to the side of the movable seat.

[0013] Preferably, both ends of the telescopic rod are connected to the pressing cylinder and the movable seat.

[0014] Preferably, the arc-shaped pressure plate matches the rubber opening.

[0015] A testing method for an airtightness testing device for a pneumatic actuator includes the following steps:

[0016] Step 1: Place the actuator body on top of the base. The electric push rod drives the drive plate forward. The drive plate applies a pushing force to the two L-shaped rods, pushing the two sliding blocks forward synchronously. The sliding blocks apply pressure to the push-pull plate, that is, the push-pull plate pushes the moving plate forward, driving the movement of the clamping plate. That is, the two clamping plates move closer to each other, realizing the centering of the actuator body.

[0017] Step 2: The forward movement of the drive plate synchronously drives the forward movement of the pressing cylinder and the pressing column, so that the end of the pressing column presses against the front end of the actuator body, and the rear side of the actuator body is attached to the side plate. At this time, the guide block moves forward in the inner cavity, the second spring is gradually compressed, and the rubber port is aligned with the air hole, but not in contact. The movement of the pressing column drives the L-shaped plate to move forward, so that the sliding column slides in the inclined hole, driving the moving seat and the arc-shaped pressure plate to move towards the rubber port, and the telescopic rod gradually extends.

[0018] Step 3: The electric push rod continues to push the drive plate forward, causing the moving plate to move further. Spring 1 is compressed, pressing the clamping plate against both sides of the actuator body. At the same time, the end of the pressing column presses against the front end of the actuator body. Spring 2 is further compressed, achieving full compression of the actuator body with high stability. The pressing column drives the L-shaped plate to move further forward, inserting the air hole into the rubber port and connecting with the plug. The two arc-shaped pressure plates press against the rubber port, achieving a sealed connection between the plug and the air hole, preventing gas leakage during testing.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention is equipped with a clamping mechanism, a pressing mechanism, and a locking mechanism. The clamping mechanism includes two sliding blocks, two push-pull plates, two moving plates, two clamping plates, and multiple springs. The pressing mechanism includes a pressing cylinder, a pressing column, a second spring, an inner cavity, and a guide block. The locking mechanism includes a telescopic rod, a moving seat, an oblique hole, a sliding column, an L-shaped plate, and an arc-shaped pressure plate. The actuator body is placed on top of the base (it may not contact the side plate). The electric push rod drives the drive plate to move forward, simultaneously applying a pushing force to the two sliding blocks. That is, the push-pull plates push the moving plates and clamping plates forward, so that the two clamping plates press against the two sides of the actuator body to achieve centering. At the same time, the forward movement of the drive plate synchronously drives the pressing cylinder and pressing column to move forward, so that the end of the pressing column presses against the front end of the actuator body, making the actuator body... The rear side of the actuator body is attached to the side plate. Spring 2 is gradually compressed, while the rubber port and the air hole are aligned but not in contact. The movement of the pressing column moves the L-shaped plate forward, causing the sliding column to slide in the inclined hole, which in turn moves the moving seat and the arc-shaped pressure plate towards the rubber port. The telescopic rod gradually extends, and the electric push rod continues to drive the drive plate forward, causing the moving plate to move further. Spring 1 is compressed, causing the clamping plate to press against both sides of the actuator body. At the same time, the end of the pressing column presses against the front end of the actuator body. Spring 2 is further compressed, achieving full compression of the actuator body, resulting in high stability and facilitating subsequent testing. The pressing column drives the L-shaped plate to move further forward, and the air hole is inserted into the rubber port and mates with the plug. The two arc-shaped pressure plates press against the rubber port, achieving a sealed connection between the plug and the air hole, preventing gas leakage during testing. The operation is flexible and convenient, and it is highly practical. Attached Figure Description

[0020] Figure 1 This is a perspective view of the present invention;

[0021] Figure 2 for Figure 1 Enlarged view at point B in the middle;

[0022] Figure 3 This is a schematic diagram of the pressing mechanism structure of the present invention;

[0023] Figure 4 for Figure 1 Enlarged view of point A in the middle.

[0024] In the diagram: 1. Base; 2. Side plate; 3. Clamping plate; 4. Spring 1; 5. Moving plate; 6. Slide 1; 7. Push-pull plate; 8. Slide 2; 9. Sliding block; 10. L-shaped rod; 11. Air hole; 12. Actuator body; 13. Slide 3; 14. Pressing column; 15. Connector; 16. Drive plate; 17. Electric push rod; 18. Mounting base; 19. Moving base; 20. Pressing cylinder; 21. Telescopic rod; 22. Slanted hole; 23. Slide column; 24. L-shaped plate; 25. Arc-shaped pressure plate; 26. Rubber port; 27. Plug; 28. Inner cavity; 29. ​​Spring 2; 30. Guide block; 31. Guide column; 32. Spring 3. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Please see Figures 1 to 4 This invention provides a pneumatic actuator airtightness detection device, including a base 1 and a clamping mechanism connected to the base 1. The clamping mechanism is used to clamp both sides of the actuator body 12, and includes two sliding blocks 9, two push-pull plates 7, two moving plates 5, two clamping plates 3, and multiple springs 4. The multiple springs 4 are connected between the clamping plates 3 and the moving plates 5. The two ends of the push-pull plates 7 are connected to the sliding blocks 9 and the moving plates 5. The sliding blocks 9 are connected to a drive mechanism for driving the sliding blocks 9 to reciprocate. The drive mechanism includes an electric push rod 17, a drive plate 16, and two L-shaped rods 10. The two ends of the L-shaped rods 10 are connected to the drive plate 16 and the sliding blocks 9. The power output end of the electric push rod 17 is connected to the drive plate 16, and the electric push rod 17 is fixed to a mounting base 18 connected to the top of the base 1. The mounting base 18 fixes the electric push rod 17 and improves the stability of the electric push rod 17. The drive plate 16 is connected to a clamping mechanism for clamping the actuator body 12. The clamping mechanism includes a pressing cylinder 20, a pressing column 14, and a second spring 29. The second spring 29 drives the pressing column 14 to move away from the pressing cylinder 20. The end of the pressing column 14 is inserted into the pressing cylinder 20. A plug 27 is connected to one side of the drive plate 16. The plug 27 is connected to a rubber port 26 and matches the air hole 11. A connector 15 is connected to the top of the drive plate 16. The connector 15 is connected to the plug 27 and is connected to an external air tightness detector through an air supply hose. The pressure value detected by the air tightness detector is used to determine whether there is an air leak. The air tightness detector uses existing conventional technology. The pressing cylinder 20 is connected to a clamping mechanism for clamping the rubber port 26. A side plate 2 is fixed to the top of the base 1.

[0027] The actuator body 12 is placed on top of the base 1 (it may not contact the side plate 2). The electric push rod 17 drives the drive plate 16 to move forward, applying a pushing force to the two L-shaped rods 10. The L-shaped rods 10 apply a pushing force to the corresponding sliding blocks 9, that is, the push-pull plate 7 pushes the moving plate 5 and the clamping plate 3 to move forward, so that the two clamping plates 3 press against the two sides of the actuator body 12 to achieve centering. At the same time, the forward movement of the drive plate 16 synchronously drives the pressing cylinder 20 and the pressing column 14 to move forward, so that the end of the pressing column 14 presses against the front end of the actuator body 12, and the rear side of the actuator body 12 is attached to the side plate 2. The second spring 29 is gradually compressed, while the rubber port 26 is aligned with the air hole 11, but not in contact. The movement of the pressing column 14 drives the L-shaped plate 24 to move forward, so that the sliding column 23 slides in the inclined hole 22, driving the moving seat 19 and the arc-shaped pressure plate 25 to move towards the rubber port 26. The telescopic rod 21 gradually extends, and the electric push rod 17 continues to drive the drive plate 16 to move forward, so that the moving plate 5 moves further. The first spring is compressed by the 4, so that the clamping plate 3 is pressed against both sides of the actuator body 12. At the same time, the end of the pressing column 14 is pressed against the front end of the actuator body 12, and the second spring 29 is further compressed, so as to achieve full pressing of the actuator body 12, which has high stability and is convenient for subsequent testing. Pressing column 14 drives L-shaped plate 24 to move forward further, air hole 11 is inserted into rubber port 26 and docks with plug 27, two arc-shaped pressure plates 25 press tightly against rubber port 26, realize the connection and sealing between plug 27 and air hole 11, avoid gas leakage during testing, and make operation flexible and convenient.

[0028] After the pneumatic actuator has finished testing, the electric push rod 17 drives the drive plate 16 to move back, which in turn drives the two sliding blocks 9 to move back. The sliding blocks 9 apply a pulling force to the push-pull plate 7, which can drive the two moving plates 5 to move away from each other, so that the two clamping plates 3 move away from each other and separate from the actuator body 12. At the same time, the end of the pressing column 14 separates from the actuator body 12, and the compressed spring 29 drives the pressing column 14 to move back. The pressing column 14 drives the L-shaped plate 24 to move back, and drives the sliding column 23 to slide and move back in the inclined hole 22, so that the moving seat 19 and the arc-shaped pressure plate 25 move synchronously towards the pressing cylinder 20. The arc-shaped pressure plate 25 separates from the rubber port 26, and the air hole 11 is pulled out from the rubber port 26 and separated from the plug 27, so as to fully loosen the pneumatic actuator and make it easier to remove it from the base 1.

[0029] The two ends of the push-pull plate 7 are connected to the moving plate 5 and the sliding block 9 via shafts.

[0030] The top of the base 1 is provided with two slide grooves 2 8, two slide grooves 1 6, and slide groove 3 13. The clamping plate 3 and the moving plate 5 are slidably connected to the corresponding slide groove 1 6 to improve the stability of the movement of the clamping plate 3 and the moving plate 5. The driving plate 16 is slidably connected to the slide groove 3 13 to improve the stability of the movement of the driving plate 16. The sliding block 9 is slidably connected to the slide groove 2 8 to guide the sliding block 9.

[0031] A guide post 31 is connected inside the slide groove 2 8. The guide post 31 passes through the sliding block 9, and a spring 32 is sleeved on the guide post 31. The two ends of the spring 32 are connected to the ends of the sliding block 9 and the slide groove 2 8.

[0032] The pressing mechanism also includes an inner cavity 28 and a guide block 30. The inner cavity 28 is disposed within the pressing cylinder 20, and the guide block 30 is slidably connected to the inner cavity 28. The end of the pressing column 14 is fixedly connected to the guide block 30, and the pressing cylinder 20 is fixed to one side of the drive plate 16. The guide block 30 provides good guidance for the pressing column 14, improving the stability of the movement of the pressing column 14. When the pressing column 14 is not in contact with the actuator body 12, the guide block 30 is connected to the end of the inner cavity 28, at which time the spring 29 is in a compressed state.

[0033] Spring 29 is located inside the inner cavity 28, and both ends of spring 29 are connected to guide block 30 and pressing cylinder 20.

[0034] The clamping mechanism includes a telescopic rod 21, a movable seat 19, an oblique hole 22, a sliding column 23, an L-shaped plate 24, and an arc-shaped pressure plate 25. The telescopic rod 21 is used to guide the movable seat 19. The oblique hole 22 is set in the movable seat 19. The sliding column 23 is slidably connected to the oblique hole 22. The two ends of the L-shaped plate 24 are connected to the pressing column 14 and the sliding column 23. The arc-shaped pressure plate 25 is fixed to the side of the movable seat 19 and matches the rubber opening 26. The two ends of the telescopic rod 21 are connected to the pressing cylinder 20 and the movable seat 19.

[0035] When the pressing column 14 is inserted into the pressing cylinder 20, the L-shaped plate 24 applies a pushing force to the sliding column 23, causing the sliding column 23 to slide in the inclined hole 22 in the direction of e. At this time, the moving seat 19 and the arc-shaped pressure plate 25 move synchronously away from the pressing cylinder 20, while the telescopic rod 21 gradually extends, providing good guidance for the moving seat 19 and the arc-shaped pressure plate 25, ensuring stable movement. The two arc-shaped pressure plates 25 press against the rubber opening 26 and connect, so that the rubber opening 26 is fully pressed against the air hole 11, reducing the risk of air leakage. When the pressing column 14 is gradually pulled out from the pressing cylinder 20, the L-shaped plate 24 applies a pulling force to the sliding column 23, causing the sliding column 23 to slide in the inclined hole 22 in the opposite direction of e. This can pull the moving seat 19 and the arc-shaped pressure plate 25 to move closer to the pressing cylinder 20. At this time, the telescopic rod 21 gradually retracts, and the arc-shaped pressure plate 25 separates from the rubber opening 26.

[0036] A testing method for an airtightness testing device for a pneumatic actuator includes the following steps:

[0037] Step 1: Place the actuator body 12 on top of the base 1. The electric push rod 17 drives the drive plate 16 to move forward. The drive plate 16 applies a pushing force to the two L-shaped rods 10, pushing the two sliding blocks 9 to move forward synchronously. The sliding blocks 9 apply pressure to the push-pull plate 7, that is, the push-pull plate 7 pushes the moving plate 5 to move forward, driving the movement of the clamping plate 3. That is, the two clamping plates 3 move closer to each other, realizing the centering of the actuator body 12.

[0038] Step 2: The forward movement of the drive plate 16 synchronously drives the pressing cylinder 20 and the pressing column 14 to move forward, so that the end of the pressing column 14 presses against the front end of the actuator body 12, and the rear side of the actuator body 12 is attached to the side plate 2. At this time, the guide block 30 moves forward in the inner cavity 28, the spring 29 is gradually compressed, and the rubber port 26 is aligned with the air hole 11, but not in contact. The movement of the pressing column 14 drives the L-shaped plate 24 to move forward, so that the sliding column 23 slides in the inclined hole 22, driving the moving seat 19 and the arc-shaped pressure plate 25 to move towards the rubber port 26, and the telescopic rod 21 gradually extends.

[0039] Step 3: The electric push rod 17 continues to push the drive plate 16 forward, causing the moving plate 5 to move further. Spring 4 is compressed, causing the clamping plate 3 to press against both sides of the actuator body 12. At the same time, the end of the pressing column 14 presses against the front end of the actuator body 12, and spring 29 is further compressed, achieving full compression of the actuator body 12 with high stability. The pressing column 14 drives the L-shaped plate 24 to move further forward, and the air hole 11 is inserted into the rubber port 26 and docks with the plug 27. The two arc-shaped pressure plates 25 press against the rubber port 26, achieving a sealed connection between the plug 27 and the air hole 11, preventing gas leakage during testing.

[0040] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pneumatic actuator air tightness detection device, characterized in that, The device includes a base (1) and a clamping mechanism connected to the base (1). The clamping mechanism is used to clamp both sides of the actuator body (12). The clamping mechanism includes two sliding blocks (9), two push-pull plates (7), two moving plates (5), two clamping plates (3), and multiple springs (4). The multiple springs (4) are connected between the clamping plates (3) and the moving plates (5). The two ends of the push-pull plates (7) are respectively connected to the sliding blocks (9) and the moving plates (5). The sliding blocks (9) are connected to a driving mechanism for reciprocating movement of the sliding blocks (9). The driving mechanism includes an electric push rod (17), a driving plate (16), and two L-shaped rods (10). The two ends of the L-shaped rods (10) are respectively connected to the driving plate (16) and the sliding blocks (9). The power output end of the push rod (17) is connected to the drive plate (16). The drive plate (16) is connected to a clamping mechanism for clamping the actuator body (12). The clamping mechanism includes a pressing cylinder (20), a pressing column (14), and a second spring (29). The second spring (29) is used to drive the pressing column (14) to move away from the pressing cylinder (20). The end of the pressing column (14) is inserted into the pressing cylinder (20). A plug (27) is connected to one side of the drive plate (16). The plug (27) is connected to a rubber port (26), and the plug (27) matches the air hole (11). The pressing cylinder (20) is connected to a clamping mechanism for clamping the rubber port (26). A side plate (2) is fixed to the top of the base (1). When the pneumatic actuator is in the positioning state, the rear end of the actuator body (12) is attached to the side plate (2), the two clamps (3) are pressed against the two sides of the actuator body (12), the pressing column (14) is pressed against the front end of the actuator body (12), the air hole (11) is inserted into the rubber port (26) and connected to the plug (27), and the clamping mechanism is clamped in the rubber port (26). The two ends of the push-pull plate (7) are respectively connected to the moving plate (5) and the sliding block (9) via shafts; The base (1) is provided with two sliding grooves 2 (8), two sliding grooves 1 (6), and sliding groove 3 (13) at its top. The clamping plate (3) and the moving plate (5) are slidably connected to the corresponding sliding groove 1 (6). The driving plate (16) is slidably connected to the sliding groove 3 (13). The sliding block (9) is slidably connected to the sliding groove 2 (8). The clamping mechanism includes a telescopic rod (21), a movable seat (19), an oblique hole (22), a sliding column (23), an L-shaped plate (24), and an arc-shaped pressure plate (25). The telescopic rod (21) is used to guide the movable seat (19). The oblique hole (22) is provided on the movable seat (19). The sliding column (23) is slidably connected to the oblique hole (22). The two ends of the L-shaped plate (24) are respectively connected to the pressing column (14) and the sliding column (23). The arc-shaped pressure plate (25) is fixed to the side of the movable seat (19).

2. The pneumatic actuator airtightness detection device according to claim 1, characterized in that, The guide post (31) is connected inside the second slide groove (8). The guide post (31) passes through the sliding block (9), and the guide post (31) is fitted with a spring (32). The two ends of the spring (32) are connected to the ends of the sliding block (9) and the second slide groove (8), respectively.

3. The pneumatic actuator airtightness detection device according to claim 1, characterized in that, The pressing mechanism also includes an inner cavity (28) and a guide block (30). The inner cavity (28) is disposed inside the pressing cylinder (20). The guide block (30) is slidably connected to the inner cavity (28). The end of the pressing column (14) is fixedly connected to the guide block (30). The pressing cylinder (20) is fixed to one side of the drive plate (16).

4. The pneumatic actuator airtightness detection device according to claim 3, characterized in that, The second spring (29) is located inside the inner cavity (28), and the two ends of the second spring (29) are connected to the guide block (30) and the pressing cylinder (20) respectively.

5. The pneumatic actuator airtightness detection device according to claim 4, characterized in that, The two ends of the telescopic rod (21) are connected to the pressing cylinder (20) and the movable seat (19), respectively.

6. The pneumatic actuator airtightness detection device according to claim 5, characterized in that, The arc-shaped pressure plate (25) is matched with the rubber opening (26).

7. The detection method of the pneumatic actuator airtightness detection device according to claim 6, characterized in that, Includes the following steps: Step 1: Place the actuator body (12) on top of the base (1), and drive the drive plate (16) forward with the electric push rod (17). The drive plate (16) applies a pushing force to the two L-shaped rods (10), pushing the two sliding blocks (9) forward synchronously. The sliding blocks (9) apply pressure to the push-pull plate (7), that is, the push-pull plate (7) pushes the moving plate (5) forward, driving the movement of the clamping plate (3), that is, the two clamping plates (3) move closer to each other, realizing the centering of the actuator body (12); Step 2: The forward movement of the drive plate (16) synchronously drives the pressing cylinder (20) and the pressing column (14) to move forward, so that the end of the pressing column (14) presses against the front end of the actuator body (12), and the rear side of the actuator body (12) is attached to the side plate (2). At this time, the guide block (30) moves forward in the inner cavity (28), the second spring (29) is gradually compressed, and the rubber opening (26) is aligned with the air hole (11) but not in contact. The movement of the pressing column (14) drives the L-shaped plate (24) to move forward, so that the sliding column (23) slides in the inclined hole (22), driving the moving seat (19) and the arc-shaped pressure plate (25) to move towards the rubber opening (26), and the telescopic rod (21) gradually extends. Step 3: The electric push rod (17) continues to push the drive plate (16) forward, causing the moving plate (5) to move further. Spring 1 (4) is compressed, causing the clamping plate (3) to press against both sides of the actuator body (12). At the same time, the end of the pressing column (14) presses against the front end of the actuator body (12), and spring 2 (29) is further compressed to achieve full pressing of the actuator body (12), resulting in high stability. The pressing column (14) drives the L-shaped plate (24) to move further forward, and the air hole (11) is inserted into the rubber port (26) and connected with the plug (27). The two arc-shaped pressure plates (25) press against the rubber port (26) to achieve a sealed connection between the plug (27) and the air hole (11), preventing gas leakage during testing.

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