A test bench for ultimate vacuum and pumping speed of a vacuum pump after maintenance

Abstract

This invention discloses a testing platform for ultimate vacuum and pumping speed of a vacuum pump after repair, relating to the field of vacuum pump testing. It includes a control box and a vacuum pump. A testing platform is fixedly installed on one side of the control box, and a movable plate is slidably installed on the testing platform. Multiple clamping mechanisms are movably installed on the movable plate to hold and drive the vacuum pump's hose connector to mate with the control box's ventilation interface. This invention, through the movable plate and elastic clamping structure, can quickly place and securely limit the vacuum pump hose connector. The transmission structure achieves automatic alignment and docking of the connector and ventilation interface, eliminating the tedious manual connection of the traditional piping, effectively reducing pre-test assembly time and the burden of manual operation. Simultaneously, the guiding structure ensures smooth and stable movement. The movable plate's movement, along with a pusher component, compresses the internal structure of the cylinder, driving gas into the sealing bladder to automatically seal the docking position. A clamping plate further limits the position of the clamping structure.

Description

Technical Field

[0001] This invention relates to the field of vacuum pump testing, specifically to a test bench for ultimate vacuum and pumping speed of a repaired vacuum pump. Background Technology

[0002] In the field of vacuum equipment operation and maintenance, vacuum pumps used in various industrial production are prone to many failures after long-term operation, such as wear of internal components, failure of sealing structure and decline in performance parameters. In order to ensure that the vacuum pump can be put into normal operation in the future, the industry generally needs to use special testing equipment to accurately test the core performance indicators of the vacuum pump, such as ultimate vacuum and pumping speed, after the maintenance work is completed, so as to determine whether the maintenance quality meets the standards.

[0003] Currently, the mainstream vacuum pump performance testing devices on the market are equipped with dedicated control boxes that connect to the vacuum pump. They collect, display, and perform preliminary processing of multiple core data such as the ultimate vacuum value and actual pumping rate of the vacuum pump. During actual maintenance work, after the staff completes a series of operations such as internal fault repair, parts replacement, and cleaning and maintenance of the vacuum pump, the vacuum pump can be placed in the designated location. The connecting pipeline is then built using this type of testing device. After the connection is completed, the equipment is started to carry out systematic performance testing.

[0004] In practical use, traditional testing devices rely on manual operation for pipeline connection. Workers need to manually align the pipeline joints and complete the splicing and fixing, which increases the workload of manual operation and reduces the efficiency of assembly work in the early stage of testing. It is difficult to meet the needs of rapid maintenance of large batches of vacuum pumps. Therefore, a test bench for ultimate vacuum and pumping speed of vacuum pumps after maintenance is proposed. Summary of the Invention

[0005] Based on this, the purpose of the present invention is to provide a test bench for ultimate vacuum and pumping speed of a vacuum pump after maintenance, so as to solve the above-mentioned technical problems.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a testing platform for ultimate vacuum and pumping speed of a vacuum pump after maintenance, comprising a control box and a vacuum pump. A testing platform is fixedly installed on one side of the control box, and a movable plate is slidably installed on the testing platform. Multiple sets of clamping mechanisms are movably installed on the movable plate for holding and driving the hose connector of the vacuum pump to connect with the air vent of the control box. The clamping mechanism includes two sets of symmetrically arranged clamping blocks and receiving blocks. Slider blocks are fixedly installed on both sides of the movable plate, and a transmission component is provided on the inner wall of the testing platform for driving the sliders to slide. A sealing airbag is fixedly installed on the side of the testing platform that is fixedly connected to the control box, and the sealing airbag is installed corresponding to the air vent. A connecting pipe is fixedly connected below the sealing airbag, and a cylinder is fixedly installed at the other end of the connecting pipe. A stopper plate is slidably installed on the inner wall of the cylinder. A pushing block corresponding to the stopper plate is provided on the side of the movable plate near the control box for pushing the stopper plate during synchronous movement with the movable plate.

[0007] By adopting the above technical solution, the sliding movable plate combined with the elastic clamping mechanism can quickly complete the placement and clamping positioning of the vacuum pump hose connector. The transmission component enables automated docking of the connector. The moving process of the movable plate drives the push block to squeeze the plug plate, which can automatically complete the inflation and sealing of the sealing airbag while completing the pipeline docking.

[0008] Furthermore, the transmission assembly includes a lead screw, a motor, a drive wheel, a chain, and a driven wheel. The lead screw is rotatably mounted on the testing platform and engages with the slider for transmission. The motor is fixedly mounted on the bottom of the testing platform, and the drive wheel is fixed at the motor output end. The driven wheel is fixed at the end of the lead screw near the control box. The chain meshes with the drive wheel and the driven wheel to transmit power to drive the lead screw to rotate. Multiple sets of fixed shafts are rotatably mounted on the inner wall of the testing platform, and the fixed shafts mesh with the chain to constrain the movement trajectory of the chain.

[0009] By adopting the above technical solution, using a chain and sprocket transmission system with a lead screw, the moving speed and travel of the movable plate can be precisely controlled, ensuring smooth and accurate connection of the hose connector. The fixed shaft limits the trajectory of the chain, effectively improving the overall durability of the transmission structure.

[0010] Furthermore, the side plate of the testing platform is provided with a sliding groove adapted to the slider. The lead screw is rotatably installed in the sliding groove, and a guide rod parallel to the lead screw is fixedly installed in the sliding groove. The slider is sleeved on the outer wall of the lead screw and the guide rod to realize the slider sliding smoothly along the axial direction of the lead screw.

[0011] By adopting the above technical solution, the slide groove, together with the parallel guide rods, limits and guides the slider, allowing the slider to maintain a straight motion posture during reciprocating sliding, further improving the stability of the moving plate during movement and ensuring smooth connection of the hose joint.

[0012] Furthermore, a second spring is fixedly connected to one side of the bottom of each of the two sets of clamping blocks, and a first spring is fixedly connected to the inner wall of each set of clamping blocks. The other end of the first spring is fixedly connected to the inner wall of the movable plate to realize the elastic clamping and resetting of the clamping blocks.

[0013] By adopting the above technical solution, the No. 1 spring and the No. 2 spring cooperate to form a two-way elastic clamping structure. The clamping force is gentle and moderate, which can not only firmly clamp the hose joint to prevent slippage and displacement, but also prevent the pipe from being damaged due to hard squeezing.

[0014] Furthermore, two sets of limiting posts are symmetrically fixedly installed at both ends of the bottom of the receiving block, and the two sets of limiting posts are slidably installed on the two sets of clamping blocks respectively, so as to realize the sliding cooperation between the receiving block and the clamping block. The top of the receiving block is an arc surface adapted to the outer wall of the hose connector, which is used to support the hose connector.

[0015] By adopting the above technical solution, the receiving block and the clamping block can be flexibly slidably cooperate with each other by means of the limiting post, so that the receiving block can adapt to the clamping structure in different opening and closing states, and the arc-shaped top surface can stably support the hose connector.

[0016] Furthermore, a connecting plate is fixedly installed on the movable plate, and a pushing block is fixedly installed on the side of the connecting plate near the cylinder. When the pushing block moves towards the control box with the movable plate, it can abut against the plug plate and push it to slide along the inner wall of the cylinder.

[0017] By adopting the above technical solution and using the connecting plate to securely install the push block, it can be ensured that the push block and the movable plate maintain a highly synchronized movement state, directly converting the moving power of the pipeline connection into the pushing power of the cylinder's internal plug plate, thus realizing the synchronous linkage between the connection operation and the inflation and sealing action.

[0018] Furthermore, a clamping plate corresponding to the clamping block is fixedly installed on the testing platform. When the hose connector and the air inlet are fully connected, the clamping plate is inserted into the gap between the clamping block and the movable plate to constrain the sliding of the clamping block and ensure clamping stability.

[0019] By adopting the above technical solution, the clamping block is physically limited after docking by the fixed clamping plate, which can effectively counteract the expansion trend caused by the spring rebound, prevent the clamping block from loosening and spreading due to equipment operation vibration, and firmly lock the clamping state of the hose connector to prevent the connector from shifting and loosening.

[0020] Furthermore, the sealing airbag has an annular structure and is sleeved on the outside of the vent. When the plug is pushed, the gas in the cylinder is injected into the sealing airbag through the connecting pipe, causing the sealing airbag to expand and fit against the outer wall of the hose connector to achieve a seal at the joint.

[0021] By adopting the above technical solution, the annular sealing airbag can fit the pipeline connection gap in all directions. It can be inflated and sealed by moving the movable plate, which is completed simultaneously with the pipeline connection action, without the need for a separate sealing operation.

[0022] In summary, the present invention has the following main beneficial effects:

[0023] This invention utilizes a movable plate and an elastic clamping structure to quickly place and securely position the vacuum pump hose connector. A transmission structure automatically aligns the connector with the ventilation interface, eliminating the tedious manual connection of traditional pipelines. This effectively reduces pre-test assembly time and the burden on manual operators. Simultaneously, a guiding structure ensures smooth and stable movement. The movable plate's movement, along with a pusher component, compresses the internal structure of the cylinder, forcing gas into the sealing bladder to automatically seal the connection. A clamping plate further limits the position of the clamping structure. This effectively ensures the airtightness of the pipeline connection, preventing gas leaks and ensuring accurate data for ultimate vacuum and pumping speed. Furthermore, it stabilizes the clamping structure, preventing loosening or misalignment of the connector due to equipment vibration. Attached Figure Description

[0024] Figure 1 This is a three-dimensional structural diagram of the entire invention;

[0025] Figure 2 This is a three-dimensional structural diagram of the detection station of the present invention;

[0026] Figure 3 For the present invention Figure 2 Enlarged view of point A;

[0027] Figure 4 This is a schematic diagram of the overall cross-sectional structure of the present invention;

[0028] Figure 5 For the present invention Figure 4 Enlarged view of point B;

[0029] Figure 6 This is a cross-sectional view of the movable plate of the present invention;

[0030] Figure 7 This is a schematic diagram illustrating the fit between the movable plate and the hose connector of the present invention;

[0031] Figure 8 This is a cross-sectional structural diagram of the detection stage of the present invention;

[0032] Figure 9 For the present invention Figure 8 Enlarged view of point C;

[0033] Figure 10For the present invention Figure 8 Enlarged view of point D.

[0034] In the picture: Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0036] The embodiments of the present invention will now be described.

[0037] A test bench for ultimate vacuum and pumping speed of a vacuum pump after repair, such as Figure 1-10 As shown, the system includes a control box 1 and a vacuum pump 4. A test platform 2 is fixedly installed on one side of the control box 1, and a movable plate 3 is slidably installed on the test platform 2. The movable plate 3 can smoothly achieve reciprocating translational movement driven by a transmission component. Multiple clamping mechanisms are movably installed on the movable plate 3 to hold and drive the hose connector 41 of the vacuum pump 4 to connect with the air inlet 11 of the control box 1. The clamping mechanism includes two sets of symmetrically arranged clamping blocks 32 and receiving blocks 322. Relying on the elastic structure, it can independently complete the flexible clamping and positioning of the hose connector 41. Slider blocks 31 are fixedly installed on both sides of the movable plate 3, and a transmission component is provided on the inner wall of the test platform 2 to drive the sliders 31. 1. Sliding: The transmission structure provides sufficient power for the movement of the movable plate 3. A sealing airbag 27 is fixedly installed on the side of the test platform 2 which is fixedly connected to the control box 1. The sealing airbag 27 is installed in correspondence with the air inlet 11. A connecting pipe 273 is fixedly connected to the bottom of the sealing airbag 27. A cylinder 271 is fixedly installed at the other end of the connecting pipe 273. A stopper plate 272 is slidably installed on the inner wall of the cylinder 271. A push block 33 corresponding to the stopper plate 272 is provided on the side of the movable plate 3 near the control box 1. It is used to push the stopper plate 272 during the synchronous movement with the movable plate 3, so as to realize the synchronous linkage of the moving docking action and the air-filling sealing action.

[0038] Please see Figure 1-10The transmission assembly includes a lead screw 21, a motor 23, a drive wheel 231, a chain 24, and a driven wheel 211. The lead screw 21 is rotatably mounted on the testing table 2 and engages with the slider 31. When the lead screw 21 rotates, it engages with the guide rod 22, enabling linear displacement of the slider 31 via a threaded transmission. The motor 23 is fixedly mounted at the bottom of the testing table 2, and the drive wheel 231 is fixed at the output end of the motor 23. The operation of the motor 23 drives the drive wheel 231 to rotate synchronously, providing power to the transmission assembly. The driven wheel 211 is fixed to one end of the lead screw 21 near the control box 1, and the chain 24 meshes with the driving wheel 231 and the driven wheel 211 to transmit power to drive the lead screw 21 to rotate. With the help of the chain 24 meshing transmission, the bidirectional power transmission can be smoothly completed. Multiple fixed shafts 25 are rotatably installed on the inner wall of the testing table 2, and the fixed shafts 25 are meshed with the chain 24 to constrain the movement trajectory of the chain 24. This can effectively limit the path of the chain 24 during operation and control it within the inner wall of the testing table 2 to prevent it from being exposed.

[0039] Please see Figure 1-10 The side plate of the testing table 2 is provided with a sliding groove that is compatible with the slider 31. The sliding groove can limit the overall sliding range of the slider 31. The lead screw 21 is rotatably installed in the sliding groove, and a guide rod 22 parallel to the lead screw 21 is fixedly installed in the sliding groove. The guide rod 22 can form a two-way limiting guide structure with the lead screw 21. The slider 31 is sleeved on the outer wall of the lead screw 21 and the guide rod 22 to realize the slider 31 sliding smoothly along the axial direction of the lead screw 21, effectively counteracting the lateral torque generated during the sliding process and avoiding jamming and deviation.

[0040] Please see Figure 1-10 Two sets of clamping blocks 32 are fixedly connected to a second spring 324 on one side of their bottom adjacent to each other. The second spring 324 can apply an elastic force to the two sets of clamping blocks 32 from the bottom and pull them together. Each set of clamping blocks 32 is fixedly connected to a first spring 321 on its inner side wall. The first spring 321 can provide elastic support and opening and closing power for the clamping block 32 from the side. The other end of the first spring 321 is fixedly connected to the inner wall of the movable plate 3 to realize the elastic clamping and reset of the clamping block 32. When the pipe is placed, it can open the clamping space by itself and automatically close to complete the clamping after placement.

[0041] Please see Figure 1-10Two sets of limiting posts 323 are symmetrically fixed at both ends of the bottom of the receiving block 322. The limiting posts 323 can precisely limit the sliding trajectory of the receiving block 322. When the two sets of clamping blocks 32 are opened to the maximum distance, the receiving block 322 is in the center position to receive the hose connector 41 and also prevents the hose from moving further down. The two sets of limiting posts 323 are slidably installed on the two sets of clamping blocks 32 to realize the sliding cooperation between the receiving block 322 and the clamping blocks 32. This allows the receiving block 322 to flexibly adjust its support position as the clamping blocks 32 open and close. The top of the receiving block 322 is an arc surface that matches the outer wall of the hose connector 41 to support the hose connector 41 and ensure a more stable support state after placement.

[0042] Please see Figure 1-10 A connecting plate 331 is fixedly installed on the movable plate 3. The connecting plate 331 serves as the installation base for the push block 33, ensuring that the push block 33 is firmly installed and its position is not easily shifted. The push block 33 is fixedly installed on the side of the connecting plate 331 near the cylinder 271. When the push block 33 moves with the movable plate 3 towards the control box 1, it can abut against the plug plate 272 and push it to slide along the inner wall of the cylinder 271. Mechanical pushing is achieved by synchronous movement, without the need for additional independent drive components.

[0043] Please see Figure 1-10 The testing table 2 is fixedly installed with a clamping plate 26 corresponding to the clamping block 32. The position of the clamping plate 26 is fixed and can form a fixed limiting and blocking structure. When the hose connector 41 is fully connected with the air inlet 11, the movable plate 3 moves to the designated connection position. The clamping plate 26 is inserted into the gap between the clamping block 32 and the movable plate 3 to constrain the sliding of the clamping block 32 and ensure clamping stability. This restricts the clamping block 32 from opening on its own and firmly locks the current clamping posture.

[0044] Please see Figure 1-10 The sealing airbag 27 has a ring structure and is sleeved on the outside of the vent 11. The ring layout can surround and cover the joint docking position in all directions. When the plug plate 272 is pushed, the plug plate 272 moves and squeezes the internal space of the cylinder 271 to complete the air pressure transmission. The gas in the cylinder 271 is injected into the sealing airbag 27 through the connecting pipe 273, causing the sealing airbag 27 to expand and fit against the outer wall of the hose joint 41 to achieve the sealing at the docking point. The deformation of the airbag fills the docking gap and blocks the air flow channel.

[0045] The working principle of this invention is as follows: When testing the repaired vacuum pump 4, first place the vacuum pump 4 on the test platform 2, and then insert the hose connector 41 of the vacuum pump 4 into the middle of the clamping assembly through the notch of the movable plate 3.

[0046] During the downward insertion of the hose connector 41, the two sets of clamping blocks 32 are pushed by the outer wall of the hose connector 41 and slide in opposite directions. At this time, the first spring 321 is compressed and the second spring 324 is stretched, and force is stored at the same time.

[0047] When the hose connector 41 reaches the clamping position, the bottom of the hose connector 41 contacts the arc-shaped surface of the receiving block 322. The two sets of clamping blocks 32 lose the compression of the hose connector 41, and the first spring 321 and the second spring 324 release their elasticity at the same time, pushing the two sets of clamping blocks 32 to slide in opposite directions, thereby achieving the effect of tightening the distance between the two sets of clamping blocks 32, thus preventing the hose connector 41 from slipping out of the clamping position.

[0048] The limiting post 323 is vertically mounted on the bottom of the receiving block 322 and slides through the clamping block 32, forming a vertical sliding limit on the receiving block 322 and limiting the movement of the receiving block 322. This ensures that the receiving block 322 can flexibly and adaptively fit the hose connector 41 to complete the support, and also prevents the receiving block 322 from slipping off.

[0049] Then, the motor 23 is started through the control box 1. The output end of the motor 23 drives the drive wheel 231 to rotate. The drive wheel 231 transmits power to the driven wheel 211 through the meshing chain 24. The fixed shaft 25 is rotatably arranged next to the path of the chain 24, which can form a path constraint on the running chain 24. The driven wheel 211 is fixed on the lead screw 21, which in turn drives the lead screw 21 to rotate in the slide groove of the detection table 2.

[0050] The sliders 31 on both sides of the movable plate 3 are simultaneously sleeved on the outer walls of the lead screw 21 and the guide rod 22. When the lead screw 21 rotates, the sliders 31 slide smoothly towards the control box 1 along the axial direction of the lead screw 21 under the guiding and limiting action of the guide rod 22. The movable plate 3 moves synchronously with the sliders 31, thereby driving the clamping mechanism and the clamped and fixed hose connector 41 to move closer to the ventilation port 11 of the control box 1.

[0051] During the process of the movable plate 3 moving towards the control box 1, the push block 33 on the movable plate 3 moves synchronously with the movable plate 3. When the movable plate 3 moves close to the control box 1, the push block 33 abuts against the plug plate 272 on the inner wall of the cylinder 271 and continues to push the plug plate 272 to slide along the inner wall of the cylinder 271.

[0052] During the sliding process of the stopper plate 272, the gas inside the cylinder 271 is compressed, and the gas is introduced into the sealing airbag 27 through the connecting pipe 273. The sealing airbag 27 is installed corresponding to the venting port 11. After the gas is injected, it gradually expands. When the hose connector 41 and the venting port 11 are fully connected, the sealing airbag 27 expands to fit the outer wall of the hose connector 41, thereby achieving a seal protection at the connection point and preventing air leakage during the detection process, thus ensuring the accuracy of the ultimate vacuum and pumping speed detection.

[0053] When the hose connector 41 is fully aligned with the vent 11, the clamping plate 26 on the test bench 2 is inserted into the gap between the clamping block 32 and the movable plate 3, which restrains the sliding of the clamping block 32 and prevents the clamping block 32 from shifting due to spring force or equipment vibration during the test, further stabilizing the clamping state of the hose connector 41 and preventing the connector from becoming loose or shifting.

[0054] At this time, the hose connector 41 and the venting interface 11 are precisely connected and well sealed. The control box 1 can introduce the detection medium into the vacuum pump 4 through the venting interface 11 and the hose connector 41. After the vacuum pump 4 is started, the control box 1 can carry out ultimate vacuum and pumping speed detection operations, collect relevant detection data in real time and perform analysis and processing.

[0055] After the test is completed, the motor 23 is turned off, the transmission component works in reverse, driving the movable plate 3 to reset away from the control box 1, pushing the block 33 to separate from the plug plate 272, the gas in the sealing airbag 27 flows back to the cylinder 271, the airbag contracts, the clamping plate 26 disengages from the gap between the clamping block 32 and the movable plate 3, the clamping block 32 resets under the action of the spring, releasing the clamp on the hose connector 41, and the operator can then take out the vacuum pump 4 that has been tested, completing the entire testing process.

[0056] Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the invention and are not intended to limit it. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions, and variations to the embodiments as needed without departing from the principles and spirit of the invention, but such modifications, substitutions, and variations are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A test bench for ultimate vacuum and pumping speed of a vacuum pump after maintenance, comprising a control box (1) and a vacuum pump (4), characterized in that: A testing platform (2) is fixedly installed on one side of the control box (1), and a movable plate (3) is slidably installed on the testing platform (2). Multiple clamping mechanisms are movably installed on the movable plate (3) for holding and driving the hose connector (41) of the vacuum pump (4) to connect with the air inlet (11) of the control box (1). The clamping mechanism includes two sets of symmetrically arranged clamping blocks (32) and receiving blocks (322). Slider blocks (31) are fixedly installed on both sides of the movable plate (3), and a transmission component is provided on the inner wall of the testing platform (2) for driving the sliders (31) to slide. A sealing airbag (27) is fixedly installed on the side of the control box (1), and the sealing airbag (27) is installed in correspondence with the ventilation port (11). A connecting pipe (273) is fixedly connected below the sealing airbag (27), and a cylinder (271) is fixedly installed at the other end of the connecting pipe (273). A plug plate (272) is slidably installed on the inner wall of the cylinder (271). A push block (33) corresponding to the plug plate (272) is provided on the side of the movable plate (3) near the control box (1), which is used to push the plug plate (272) during the synchronous movement with the movable plate (3).

2. The ultimate vacuum and pumping speed testing bench for a repaired vacuum pump according to claim 1, characterized in that: The transmission assembly includes a lead screw (21), a motor (23), a drive wheel (231), a chain (24), and a driven wheel (211). The lead screw (21) is rotatably mounted on the testing table (2) and is driven in conjunction with the slider (31). The motor (23) is fixedly mounted on the bottom of the testing table (2), and the drive wheel (231) is fixed at the output end of the motor (23). The driven wheel (211) is fixed at one end of the lead screw (21) near the control box (1). The chain (24) meshes with the drive wheel (231) and the driven wheel (211) to transmit power to drive the lead screw (21) to rotate.

3. The ultimate vacuum and pumping speed testing bench for a repaired vacuum pump according to claim 2, characterized in that: The side plate of the testing platform (2) is provided with a sliding groove that is compatible with the slider (31). The lead screw (21) is rotatably installed in the sliding groove, and a guide rod (22) parallel to the lead screw (21) is fixedly installed in the sliding groove. The slider (31) is sleeved on the outer wall of the lead screw (21) and the guide rod (22) to realize the smooth sliding of the slider (31) along the axial direction of the lead screw (21).

4. The ultimate vacuum and pumping speed testing bench for a repaired vacuum pump according to claim 2, characterized in that: The inner wall of the testing platform (2) is rotatably mounted with multiple sets of fixed shafts (25), and the fixed shafts (25) are meshed with the chain (24) to constrain the movement trajectory of the chain (24).

5. The ultimate vacuum and pumping speed testing bench for a repaired vacuum pump according to claim 1, characterized in that: Two sets of clamping blocks (32) are fixedly connected to a second spring (324) on one side of their bottom adjacent to each other, and a first spring (321) is fixedly connected to the inner wall of each set of clamping blocks (32). The other end of the first spring (321) is fixedly connected to the inner wall of the movable plate (3) to realize the elastic clamping and resetting of the clamping block (32).

6. The ultimate vacuum and pumping speed testing bench for a repaired vacuum pump according to claim 1, characterized in that: The receiving block (322) has two sets of limiting posts (323) symmetrically fixedly installed at both ends of its bottom. The two sets of limiting posts (323) are slidably installed on the two sets of clamping blocks (32) respectively, so as to realize the sliding cooperation between the receiving block (322) and the clamping block (32).

7. The ultimate vacuum and pumping speed testing bench for a repaired vacuum pump according to claim 1, characterized in that: A connecting plate (331) is fixedly installed on the movable plate (3), and a push block (33) is fixedly installed on the side of the connecting plate (331) near the cylinder (271). When the push block (33) moves with the movable plate (3) toward the control box (1), it can abut against the plug plate (272) and push it to slide along the inner wall of the cylinder (271).

8. The ultimate vacuum and pumping speed testing bench for a repaired vacuum pump according to claim 1, characterized in that: The testing platform (2) is fixedly installed with a clamping plate (26) corresponding to the clamping block (32). When the hose connector (41) and the air inlet (11) are fully connected, the clamping plate (26) is inserted into the gap between the clamping block (32) and the movable plate (3) to constrain the sliding of the clamping block (32) and ensure clamping stability.

9. A test bench for ultimate vacuum and pumping speed of a vacuum pump after repair, as described in claim 1, is characterized in that: The sealing airbag (27) has an annular structure and is sleeved on the outside of the vent (11). When the plug plate (272) is pushed, the gas in the cylinder (271) is injected into the sealing airbag (27) through the connecting pipe (273), causing the sealing airbag (27) to expand and fit against the outer wall of the hose connector (41) to achieve a seal at the docking point.

10. A test bench for ultimate vacuum and pumping speed of a vacuum pump after repair, as described in claim 1, characterized in that: The top of the receiving block (322) is an arc surface that matches the outer wall of the hose connector (41) and is used to support the hose connector (41).

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