Air tightness detection device

Abstract

The invention relates to an air tightness detection device, and relates to the field of air tightness detection devices. The device mainly comprises a base plate and a vertical plate, a moving table is arranged on the base plate, the base plate and the moving table are connected through a guide rail, a first airtight test table is fixedly arranged on the moving table, and a second airtight test table is fixedly arranged on the vertical plate; the device further comprises a clamping mechanism and a pressing mechanism. The clamping mechanism drives the moving table to move on the base plate. A pressing block is movably installed in the first air tightness test board, the pressing mechanism is used for pressing the pressing block and fixing a detection piece on the first air tightness test board, and the air tightness test device has the advantages that on the premise that the number of driving devices is reduced, the air tightness effect during testing can be guaranteed, and the cost can be reduced.

Description

TECHNICAL FIELD

[0001] The application relates to the field of air tightness detection devices, in particular to an air tightness detection device. BACKGROUND

[0002] With the wide application of air tightness detection devices in industrial production, especially in the fields of automobile manufacturing, aerospace, etc., the sealing performance of workpieces can be accurately tested, which can effectively ensure the quality and safety of products and avoid functional failure or safety accidents caused by leakage. With the continuous improvement of product quality requirements in the manufacturing industry, the research and development of air tightness detection equipment has gradually become the focus of the industry. At present, the air tightness detection technology on the market has developed into various types, such as water pressure method, air pressure method and vacuum leak detection method, etc. These methods can meet the needs of specific scenes to varying degrees and provide strong support for enterprises to improve product reliability.

[0003] In actual application process, in order to realize reliable air tightness detection function, usually the way of multi-drive cooperation is adopted to complete workpiece positioning and clamping operation. Common means include using separate power sources to control horizontal moving platform and vertical pressure applying unit respectively, or using complex linkage mechanism to integrate multiple actions together. In addition, there is also a method of using hydraulic cylinder to push the clamp to close and keep constant pressure, combined with spring force to assist adjusting the contact surface fitting degree; there is also a way of designing special gear and rack transmission system to accurately adjust the relative position relationship between two parts. Although the above various traditional ways have their own characteristics, they basically rely on different forms of mechanical motion combination to achieve the goal.

[0004] However, under the existing technical framework, since a large number of independent driving devices need to be arranged to work coordinately, this not only increases the complexity and cost of the system, but also makes it difficult to seamlessly connect and cooperate between each driving part, often causing low efficiency problem. Especially when doing air tightness test on some precision parts, if the fixing force cannot be ensured enough, it is easy to cause the existence of small gaps and produce air leakage phenomenon, which seriously affects the authenticity and accuracy of the final measurement data. Therefore, it is necessary to find a more optimized design idea to overcome this problem. SUMMARY

[0005] In order to solve the above problems, the application provides an air tightness detection device.

[0006] The air tightness detection device provided by the application adopts the following technical scheme: The utility model provides a kind of air tightness detection device, including base plate and vertical board, mobile station is provided on base plate, between base plate and mobile station is between guide rail connection, first air tightness test station is fixedly arranged on mobile station, second air tightness test station is fixedly arranged on vertical board;It further includes clamping mechanism and pressing mechanism, clamping mechanism drives the mobile station moves on base plate;First air tightness test station is movably installed with pressing block, and pressing mechanism is used to press the pressing block.

[0007] By adopting the above technical scheme, stable clamping and precise pressing of the workpiece are realized, effectively solving the problem of not tight fixation caused by excessive and difficult to coordinate driving devices in the prior art. Specifically, the guide rail connection between the base plate and the mobile station ensures smooth movement of the mobile station, and the first and second air tightness test stations provide a comprehensive test environment for the workpiece. The clamping mechanism can accurately control the position adjustment of the mobile station, and the pressing mechanism further enhances the fixation effect of the workpiece by acting on the pressing block, which helps to press the test piece and maintain its sealing during testing, improving the accuracy of air tightness detection.

[0008] Preferably, the clamping mechanism includes a frame body and a pair of pincer-shaped frames slidingly arranged on both sides of the frame body. Slotted grooves are formed on both sides of the frame body to form first sliding guide grooves, and springs a are arranged in the first sliding guide grooves. The two ends of each pincer-shaped frame are provided with a sliding hole portion and a push block portion, respectively. The push block portion is slidingly arranged in the first sliding guide groove and abuts against the spring a.

[0009] By adopting the above technical scheme, the clamping mechanism can stably drive the mobile station. The first sliding guide grooves on both sides of the frame body and the springs a allow the pincer-shaped frames to smoothly slide along the slotted grooves when subjected to external force, and automatically reset or buffer the force by relying on the elastic force of the springs a, thereby improving the reliability and accuracy of the clamping action and ensuring that the clamping force is not too large to damage the test piece. This design effectively reduces the coordination problem between traditional multiple driving devices, improving the efficiency and stability of the entire air tightness detection process.

[0010] Preferably, the clamping mechanism further includes a clamp, which includes a clamp body and a clamping portion and a sliding portion at both ends of the clamp body. The sliding portion is movably inserted into the sliding hole portion. The clamping portion is provided with a clamping groove for clamping the test piece. The clamp body is provided with a slotted groove to form a second sliding guide groove.

[0011] By adopting the above technical scheme, the number of driving devices is effectively reduced by the clamps, stable clamping of the test piece is achieved by a single structure, and the cooperation efficiency between components is improved. The clamping part can accurately fix the test piece, and the clamping groove can ensure high adhesion between the test piece and the detection piece, so as to protect and clamp the test piece. During the test, the clamps always maintain the clamping state of the test piece, so as to ensure that the test piece does not shift or loosen during the airtightness test, thereby avoiding air leakage caused by poor fixation, and significantly improving the accuracy of the test result. The cooperation of the sliding part and the sliding hole part ensures the stability and reliability of the clamping action, and the design of the second sliding guide groove provides a structural basis for further optimizing the clamping action.

[0012] Preferably, a spring b is arranged in the second sliding guide groove, and the clamping mechanism further comprises a connecting rod a and a connecting rod b hinged together through a hinge shaft, one end of each of the connecting rod a and the connecting rod b away from the hinge is slidingly arranged in the second sliding guide groove, and one end of the connecting rod a and the connecting rod b extending into the second sliding guide groove is hingedly connected with a push block. The principle of the push block is the same as that of the push block part, and both play a sliding role. The only difference is that the connection mode adopts hinging. A threaded sliding block is fixedly arranged at the hinge shaft, a lead screw is connected to the bottom of the threaded sliding block, one end of the lead screw is connected with the threaded sliding block, and the other end is rotatably arranged on the frame body. A motor for driving the lead screw is fixedly arranged on the frame body.

[0013] By adopting the above technical scheme, automatic control and accurate adjustment of the clamping mechanism are realized. The spring b arranged in the second sliding guide groove can provide elastic support force to ensure the stability of the connecting rod a and the connecting rod b during movement and avoid structure loosening caused by external impact or vibration. The connecting rod a and the connecting rod b are connected through the hinge shaft, and one end of each is slidingly arranged in the second sliding guide groove. This design can realize flexible adjustment of multiple degrees of freedom, so as to form a clamping movement track. The combination of the threaded sliding block and the lead screw can realize accurate position control under the driving of the motor, improve the reliability and consistency of the clamping action, and reduce the demand for traditional multiple driving devices. The overall design scheme simplifies the system architecture by using only one motor as a driving source, improves the cooperation efficiency between components, and further improves the fixation tightness during the airtightness test, effectively prevents air leakage, and ensures the accuracy of the test result.

[0014] Preferably, the bottom of the threaded sliding block can be clamped with the moving table.

[0015] By adopting the technical scheme, the detachable connection between the threaded sliding block and the moving table is realized. The clamping mechanism can drive the moving table to move to a predetermined position through the threaded sliding block, thereby improving the fixing accuracy of the workpiece by the first airtight test table and the second airtight test table, and reducing the air leakage risk caused by position deviation. In combination with the motor driving the screw rod to rotate, the threaded sliding block moves along the screw rod direction, further ensuring the stability of the clamping mechanism action and improving the operation reliability of the whole device. The design effectively solves the problem that the multiple driving devices are difficult to coordinate, and improves the overall efficiency and accuracy of the air tightness detection.

[0016] Preferably, the first airtight test table is provided with a pressing hole, and the pressing block is installed in the pressing hole. The pressing mechanism includes a plurality of wedge blocks rotatably installed on the inner wall of the pressing hole. The top of the wedge block is provided with a clamping portion facing the middle part of the pressing hole. The wedge block and the inner wall of the pressing hole are connected with a return spring.

[0017] By adopting the technical scheme, the workpiece can be stably pressed during the detection process. Specifically, the pressing hole in the first airtight test table cooperates with the pressing block installed inside it, and the wedge block and the return spring in the pressing mechanism work together, so that the wedge block can tightly hold the pressing block through the clamping portion, thereby tightly pressing the test piece with the pressing block, avoiding the air leakage problem caused by loose fixation, and significantly improving the accuracy and reliability of the air tightness detection.

[0018] Preferably, the bottom of the wedge block is provided with a pressing assembly, and the pressing assembly includes a top rod. The top of the top rod is fixedly provided with a wedge seat. The top of the wedge seat is fixedly provided with a plurality of connecting shafts rotatably connected with the wedge block.

[0019] By adopting the technical scheme, the pressing assembly composed of the top rod, the wedge seat and the connecting shafts rotatably connected with the wedge block is used to support the clamping of the wedge block.

[0020] Preferably, the bottom of the top rod is provided with a roller. A pressing spring is arranged on the top rod between the wedge seat and the roller.

[0021] By adopting the technical scheme, the setting of the roller can reduce the friction between the top rod and the pressing block, so that the top rod moves more smoothly in the up-down movement process, thereby improving the stability of the pressing process. The setting of the pressing spring can provide a buffering effect when the top rod is stressed, and can also press the wedge block tightly through the elastic force.

[0022] Preferably, a guide seat is fixedly arranged on the base plate, and an inclined guide surface is obliquely arranged on the guide seat.

[0023] By adopting the technical scheme, the guide seat is additionally arranged on the base plate, and the inclined guide surface is arranged on the guide seat, so that the ejector rod can be effectively guided to move along the inclined guide surface, and the ejector rod can be moved up and down.

[0024] Preferably, the pressing block comprises a clamping portion and a pressing portion, the pressing portion cannot pass through the pressing hole, and the clamping portion is in a spherical shape.

[0025] By adopting the technical scheme, the pressing block comprises a clamping portion and a pressing portion, the pressing portion cannot pass through the pressing hole, and the clamping portion is in a spherical shape.

[0026] In summary, the present application has at least one of the following beneficial technical effects: 1. By the cooperation of the clamping mechanism and the pressing mechanism, only one driving device is needed to realize the accurate movement and firm fixation of the workpiece, the number of driving devices is significantly reduced, the overall efficiency of the system is improved, and the cost is reduced; 2. The guide rail connection between the moving table and the base plate in combination with the design of the clamping mechanism ensures the stable movement of the workpiece in the horizontal direction, enhances the positioning accuracy, avoids the risk of air leakage caused by position deviation, and the moving table can be driven by abutting against the threaded sliding block; 3. The cooperation of the pressing block and the pressing mechanism can apply uniform pressure to the workpiece in the vertical direction, effectively solving the problem of loose fixation, and improving the reliability of the air tightness test and the accuracy of the test results. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a perspective view of the air tightness detection device; Figure 2 is a specific structure view of the clamping mechanism; Figure 3 is a perspective view of part of the air tightness detection device structure; Figure 4 is a cross-sectional view of the pressing mechanism before pressing; Figure 5 is a cross-sectional view of the pressing mechanism after pressing.

[0028] Explanation of reference numerals: 1, frame; 11, first sliding guide groove; 111, spring a; 12, clamp frame; 121, sliding hole portion; 122, push block portion; 123, clamp; 124, clamping portion; 127, slot; 125, sliding portion; 126, clamp body; 128, second sliding guide groove; 129, spring b; 21, rotating fixed seat; 22, threaded slider; 221, connecting rod a; 222, connecting rod b; 223, hinge shaft; 23, screw rod ; 24. Motor; 31. Wedge block; 32. Abutment spring; 33. Return spring; 34. Embracing part; 41. Wedge seat; 411. Connecting shaft; 42. Push rod; 421. Roller; 422. Compression spring; 51. Guide seat; 52. Inclined guide surface; 6. Compression block; 61. Clamping part; 62. Compression part; 7. Base plate; 71. Moving table; 711. First airtight test bench; 712. Compression hole; 8. Vertical plate; 81. Second airtight test bench. DETAILED DESCRIPTION

[0029] The present application is further described in detail below with reference to the accompanying drawings.

[0030] In the description of the invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the invention.

[0031] Example 1 The present application discloses an airtightness detection device, referring to Figure 1 、 Figure 2 and Figure 3, including the base plate 7 and the vertical plate 8, the base plate 7 is provided with the moving table 71, and the base plate 7 and the moving table 71 are connected by the guide rail, and the first airtight test table 711 is fixedly arranged on the moving table 71, and the second airtight test table 81 is fixedly arranged on the vertical plate 8. The first airtight test table 711 and the second airtight test table 81 respectively detect the airtightness of two pipe openings of the test workpiece. During detection, the test openings of the test workpiece need to be aligned with the first airtight test table 711 and the second airtight test table 81 respectively. In order to facilitate the placement of the test workpiece, the test device further comprises a clamping mechanism and a pressing mechanism. The clamping mechanism drives the moving table 71 to move on the base plate 7. The pressing block 6 is movably arranged in the first airtight test table 711. The pressing mechanism is used for pressing the pressing block 6. The vertical plate 8 is arranged in the feeding direction of the moving table 71. When the test workpiece is placed on the first airtight test table 711, the clamping mechanism clamps and fixes the test workpiece and drives the moving table 71 to move towards the position of the vertical plate 8, so that the other test opening of the test workpiece abuts against the second airtight test table 81. Thus, the airtightness of the test workpiece is maintained. The first airtight test table 711 and the second airtight test table 81 are prior art.

[0032] In order to facilitate the clamping of the test workpiece, the clamping mechanism comprises a frame body 1 and a pair of pincer-shaped frames 12 slidably arranged on both sides of the frame body 1. The frame body 1 is provided with a sliding groove on both sides to form a first sliding guide groove 11. The first sliding guide groove 11 is provided with a spring a111. The two ends of the pincer-shaped frame 12 are respectively provided with a sliding hole part 121 and a push block part 122. The push block part 122 is slidably arranged in the first sliding guide groove 11 and abuts against the spring a111, so that one end of the pincer-shaped frame 12 can move along the first sliding guide groove 11. With the movement of the push block part 122 in the first sliding guide groove 11, the pincer-shaped frame 12 moves away from the frame body 1, and the spring a111 is compressed. The spring a111 plays a buffering role. The clamping mechanism further comprises a clamp 123. The clamp 123 comprises a clamp body 126, a clamping part 124 and a sliding part 125 arranged at both ends of the clamp body 126. The sliding part 125 is movably inserted into the sliding hole part 121. Due to the arrangement of the sliding hole part 121 and the movably inserted sliding part 125 in the sliding hole part 121, the clamp 123 can move in the sliding hole part 121. Specifically, the two sliding hole parts 121 are arranged towards the same direction, so that the clamp 123 can move towards each other and finally form the technical effect of being clamped by two clamps 123. The clamp 123 is mainly used for clamping the test workpiece. A clamping part 124 is arranged on the clamp 123. The clamping part 124 is provided with a clamping groove 127 for clamping the test workpiece. The clamp 123 can be more closely attached to the surface of the test workpiece, thereby protecting the test workpiece and avoiding damage to the test workpiece.

[0033] The second sliding guide groove 128 is provided with a spring b 129. The clamping mechanism further comprises a connecting rod a 221 and a connecting rod b 222 hinged together through a hinge shaft 223. One end of the connecting rod a 221 and the connecting rod b 222 is hinged through the hinge shaft 223. The other end of the connecting rod a 221 and the connecting rod b 222 is respectively slidably arranged in the second sliding guide groove 128. A threaded sliding block 22 is fixedly arranged at the hinge shaft 223. A screw rod 23 is connected to the bottom of the threaded sliding block 22. One end of the screw rod 23 is connected to the threaded sliding block 22, and the other end is rotatably arranged on the frame body 1. A motor 24 for driving the screw rod 23 is fixedly arranged on the frame body 1. The connecting rod a 221 and the connecting rod b 222 can slide along the second sliding guide groove 128, thereby pushing the clamp 123 to move. The spring b 129 also plays a buffering role in this process. The movement of the clamp frame 12 and the clamp 123 stops until the spring a 111 and the spring b 129 are compressed to the maximum extent.

[0034] The bottom of the threaded sliding block 22 can be clamped with the moving table 71, but the stroke of the threaded sliding block 22 is greater than that of the moving table 71. Therefore, the threaded sliding block 22 needs to move a distance first and then be clamped with the moving table 71, thereby driving the moving table 71 to move.

[0035] The implementation principle of the embodiment is as follows: the test work is first placed on the first airtight test table 711, and the pressing block 6 is placed in the pressing hole 712. The driving source outputs power through the only motor 24, drives the screw rod 23 to rotate, and drives the threaded sliding block 22 to move towards the vertical plate 8. Through the linkage of the connecting rod a 221 and the connecting rod b 222, the spring b 129 is first compressed and pushes the clamp 123 to move along the sliding hole part 121, and finally forms a clamping movement track, so that the clamp 123 can first clamp the test workpiece. When the test workpiece is clamped, the threaded sliding block 22 continues to move. Due to the arrangement of the spring a 111 and the spring b 129, the clamping force of the test workpiece gradually increases. However, the movement in this process is consumed by the compression force of the spring. Therefore, the threaded sliding block 22 can continue to move until the threaded sliding block 22 is clamped with the moving table 71. At this time, the spring a 111 and the spring b 129 no longer continue to compress, and the threaded sliding block 22 pushes the moving table 71 to move towards the vertical plate 8. Finally, the other to-be-tested hole of the test work is in contact with the second airtight test table 81, and is pressed under the output of the motor 24, so as to ensure the airtightness.

[0036] Embodiment 2 With reference to Figure 4 And Figure 5The embodiment of the present application differs from the embodiment 1 in that the first air tightness test table 711 is provided with a pressing hole 712, the pressing block 6 is installed in the pressing hole 712, the pressing mechanism comprises a plurality of wedge blocks 31 rotatably installed on the inner wall of the pressing hole 712, and the top of the wedge block 31 is provided with a clamping portion 34 facing the middle part of the pressing hole 712. The pressing block 6 comprises a clamping portion 61 and a pressing portion 62, the pressing portion 62 cannot pass through the pressing hole 712, the clamping portion 61 is in a spherical shape, the pressing portion 62 is used to press the test workpiece towards the first air tightness test table 711, and the clamping portion 61 is provided to facilitate clamping with the clamping portion 34, so that the wedge block 31 can be clamped and connected with the pressing block 6. The bottom of the wedge block 31 is provided with a pressing assembly, the pressing assembly comprises a jacking rod 42, the top of the jacking rod 42 is fixedly provided with a wedge seat 41, and the top of the wedge seat 41 is fixedly provided with a plurality of connecting shafts 411 rotatably connected with the wedge block 31. The bottom of the jacking rod 42 is provided with a roller 421, a pressing spring 422 sleeved on the jacking rod 42 is arranged between the wedge seat 41 and the roller 421, the top of the pressing spring 422 abuts against the top of the moving table 71, in order to ensure the normal rolling of the roller 421, a protective cover for protecting the roller 421 is fixedly arranged on the jacking rod 42, and the bottom of the pressing spring 422 abuts against the protective cover. The wedge block 31 is connected with the inner wall of the pressing hole 712 through a reset spring 33, the reset spring 33 always keeps the wedge block 31 in a state of being popped open, i.e. the state of the wedge block 31 not clamping the clamping portion 61, through the elastic force of the reset spring 33. The guide seat 51 is also fixedly arranged on the base plate 7, the guide seat 51 is obliquely provided with an inclined guide surface 52, and the height of the inclined guide surface 52 gradually decreases towards the vertical plate 8. When the moving table 71 does not move towards the vertical plate 8, the jacking rod 42 is located at the highest position of the guide seat 51, i.e. the roller 421 contacts the highest point of the inclined guide surface 52.

[0037] The implementation principle of the embodiment 2 is that when the moving table 71 continues to move towards the vertical plate 8 after the threaded sliding block 22 pushes another test port of the test workpiece to contact with the second airtight test table 81, the top rod 42 in the pressing hole 712 of the first airtight test table 711 is pushed to move along the guide seat 51. Before the top rod 42 moves with the moving table 71, the top rod 42 and the wedge seat 41 are located at the highest position in the pressing hole 712. Due to the arrangement of the pressing spring 422, the top rod 42 always maintains a downward moving posture under the elastic force of the pressing spring 422. With the movement of the moving table 71, the roller 421 rolls down along the gradually descending inclined guide surface 52, the top rod 42 drives the wedge seat 41 to move downward, and the wedge seat 41 pulls the wedge block 31 downward when moving downward, so that the wedge block 31 inclines towards the clamping part 61, and finally the clamping part 61 is completely clamped by the embracing part 34. Then, with the continuous downward movement of the top rod 42, the pressing part 62 only presses the test workpiece on the first airtight test table 711. When the moving table 71 moves and makes the test workpiece abut against the second airtight test table 81, the downward pressure of the pressing block 6 on the test workpiece reaches the maximum, and at this time, the contact force between the test workpiece and the second airtight test table 81 reaches the maximum, so that the fixation of the test workpiece and the sealing are realized only through one driving source (the motor 24), and the coordination between the first airtight test table 711, the second airtight test table 81 and the test workpiece reaches the best.

[0038] The above are the preferred embodiments of the present application, which do not limit the protection scope of the present application. Therefore, any equivalent changes made on the structure, shape and principle of the present application should be covered within the protection scope of the present application.

Claims

1. An airtightness detection device, characterized in that: The apparatus comprises a base plate (7) and a vertical plate (8); a movable platform (71) is provided on the base plate (7); the base plate (7) and the movable platform (71) are connected by a guide rail; a first airtightness test platform (711) is fixedly provided on the movable platform (71); and a second airtightness test platform (81) is fixedly provided on the vertical plate (8); It also includes a clamping mechanism and a pressing mechanism, wherein the clamping mechanism drives the movable platform (71) to move on the substrate (7); a pressing block (6) is movably installed in the first airtight test platform (711), and the pressing mechanism is used to press the pressing block (6).

2. The airtightness detection device according to claim 1, characterized in that: The clamping mechanism comprises a frame body (1) and a clamp-shaped frame (12) slidably arranged on both sides of the frame body (1); a sliding groove is opened on both sides of the frame body (1) to form a first sliding guide groove (11); a spring a (111) is arranged in the first sliding guide groove (11); a sliding hole portion (121) and a push block portion (122) are respectively arranged at both ends of the clamp-shaped frame (12); the push block portion (122) is slidably arranged in the first sliding guide groove (11) and abuts against the spring a (111).

3. The airtightness detection device according to claim 2, characterized in that: The clamping mechanism further comprises a clamp (123), the clamp (123) comprising a clamp body (126) and a clamping portion (124) and a sliding portion (125) located at both ends of the clamp body (126), the sliding portion (125) being movably inserted into the sliding hole portion (121), the clamping portion (124) being provided with a clamping groove (127) for clamping the test piece, and the clamp body (126) being provided with a sliding groove forming a second sliding guide groove (128).

4. The airtightness detection device according to claim 3, characterized in that: A spring b (129) is provided in the second sliding guide groove (128), and the clamping mechanism also includes a connecting rod a (221) and a connecting rod b (222) hinged together by a hinge shaft (223), and the connecting rod a (221) and the connecting rod b (222) are respectively slidably provided in the second sliding guide groove (128) at one end away from the hinge, and a threaded slider (22) is fixedly provided at the hinge shaft (223), and a screw rod (23) is connected to the bottom of the threaded slider (22), one end of the screw rod (23) is connected to the threaded slider (22), and the other end is rotatably provided on the frame (1), and a motor (24) for driving the screw rod (23) is fixedly provided on the frame (1).

5. The airtightness detection device according to claim 4, characterized in that: The bottom of the threaded slider (22) can be snap-connected with the moving platform (71).

6. The airtightness detection device according to claim 1, characterized in that: The first airtight test bench (711) is provided with a clamping hole (712), the clamping block (6) is installed in the clamping hole (712), the clamping mechanism includes a plurality of wedge blocks (31) rotatably installed on the inner wall of the clamping hole (712), the top of the wedge block (31) is provided with an embracing portion (34) facing the middle of the clamping hole (712), and a return spring (33) is connected between the wedge block (31) and the inner wall of the clamping hole (712).

7. The airtightness detection device according to claim 6, characterized in that: A pressing assembly is provided at the bottom of the wedge block (31), and the pressing assembly includes a push rod (42). A wedge seat (41) is fixedly provided on the top of the push rod (42), and a plurality of connecting shafts (411) rotatably connected to the wedge block (31) are fixedly provided on the top of the wedge seat (41).

8. The airtightness detection device according to claim 7, characterized in that: A roller (421) is provided at the bottom of the push rod (42), and a compression spring (422) sleeved on the push rod (42) is provided between the wedge seat (41) and the roller (421).

9. The airtightness detection device according to claim 1, characterized in that: A guide seat (51) is also fixedly provided on the base plate (7), and an inclined guide surface (52) is obliquely provided on the guide seat (51).

10. The airtightness detection device according to claim 1, characterized in that: The pressing block (6) comprises a clamping portion (61) and a pressing portion (62), the pressing portion (62) cannot pass through the pressing hole (712), and the clamping portion (61) is spherical.

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