Fatigue life testing tool for corrugated pipe

Abstract

The invention relates to the technical field of corrugated pipe testing tools, and particularly discloses a corrugated pipe fatigue life testing tool which is characterized in that two sets of testing mechanisms are mounted on a machine body, and each set of testing mechanism comprises a base plate, a top plate, a driving rod and a sealing cover; a first connecting base and a second connecting base are fixed to the bottom disc and the top disc respectively, and the top disc is provided with an air suction hole and connected with an air exhaust hose. The driving rod vertically penetrates through the chassis and is fixedly provided with a third connecting seat; the sealing cover can be in sealed butt joint with the chassis, and a penetrating connector for communicating the air exhaust hose with the vacuum generation system is fixed to the side wall. The two driving rods are in transmission connection through a synchronizing piece, and in the reciprocating movement process, when one corrugated pipe stretches, the other corrugated pipe shrinks. The test tool can be used for testing the corrugated pipe under normal pressure, external vacuum and internal vacuum environments, is suitable for welding the corrugated pipe and ensures the accuracy of test data; the test efficiency is obviously improved, the work is stable, the energy consumption is low, and the test cost is greatly saved; the structure is simple, manufacturing is easy, and the implementation cost is low.

Description

Technical Field

[0001] The invention relates to the technical field of bellows testing tooling, and in particular to a bellows fatigue life testing tooling. Background Art

[0002] As the core component of high-precision sealing and motion transmission, welded bellows are widely used in aerospace, vacuum equipment, precision instruments and other fields. Their fatigue life directly affects the reliability of the equipment. Especially under vacuum conditions, welded bellows are subjected to periodic pressure differences and deformation stresses, and the fatigue performance requirements are extremely stringent. However, most of the existing fatigue testing equipment is only suitable for testing conventional bellows under normal pressure. When testing welded bellows, it is impossible to stably build a vacuum environment on the inside or outside, resulting in a large deviation between the test data and the actual working conditions.

[0003] The patented technology with publication number CN119290563A provides a bellows fatigue test device under vacuum state, which can construct a vacuum environment to simulate the actual working conditions of welded bellows and improve the objectivity of test data. However, in actual implementation and use, there are still certain shortcomings: for example, during the reciprocating expansion and contraction of the bellows, the load of the drive unit fluctuates violently, which has an adverse effect on the operating stability, energy efficiency ratio and energy consumption of the system; during the test, the rebound force of the bellows and the atmospheric pressure will produce reverse loads, and the equipment cannot effectively recover these energies, resulting in serious energy waste, further increasing energy consumption costs. In addition, the structural design of the air path and the transparent cover in this technical solution is relatively complex, and it is difficult to ensure air tightness. The implementation cost is high and the difficulty is great. Summary of the invention

[0004] The technical purpose of the present invention is to provide a bellows fatigue life test tool to solve the deficiencies in the prior art.

[0005] In order to achieve the above technical objectives, the present invention adopts the following technical solutions: A bellows fatigue life test tool, comprising a body and a test mechanism; characterized in that the test mechanism is provided with two sets, each set of the test mechanism comprises: The bottom plate and the top plate are fixed on the machine body, and the first connecting seat and the second connecting seat are fixed on the opposite sides respectively; the bottom plate is provided with a vent hole, and the top plate is provided with an air suction hole and is connected with an air extraction hose; A driving rod vertically passes through the chassis, a third connecting seat is fixed on the driving rod, and the third connecting seat is located between the first connecting seat and the second connecting seat; The sealing cover can be sealed and docked with the bottom plate to seal the top plate and the third connecting seat inside; a through joint is fixed on the side wall of the sealing cover, and the air extraction hose extends into the sealing cover and is connected to the vacuum generating system through the through joint; The two driving rods are connected through a synchronous member. After the two testing mechanisms are installed with bellows in the same way, during the reciprocating movement of the two driving rods, one bellows stretches while the other bellows contracts, and the two bellows are alternately moved.

[0006] In a preferred embodiment, the position of the third connecting seat on the driving rod is adjustable.

[0007] In a preferred embodiment, the first connecting seat and the second connecting seat are respectively fixed to the bottom plate and the top plate in a detachable manner, and the third connecting seat is fixed to the driving rod in a detachable manner.

[0008] In a preferred embodiment, the driving rod passes through the chassis through the vent hole, and when both ends of the bellows are respectively fixed to the first connecting seat and the third connecting seat, the driving rod is located inside the bellows.

[0009] In a preferred embodiment, a plurality of vertically extending support columns are fixed on the bottom plate, and the top plate is supported and fixed by the support columns.

[0010] In a preferred embodiment, a vacuum detection device for detecting the vacuum degree inside the through-connector is connected to the through-connector.

[0011] In a preferred embodiment, the synchronizer is a gear transmission mechanism or a connecting rod mechanism, which is rotatably connected to the machine body, and one end of the two drive rods away from the third connecting seat is connected via the gear transmission mechanism or the connecting rod mechanism.

[0012] In a preferred embodiment, the synchronizer is a fixed connecting member, and the ends of the two driving rods away from the third connecting seat are fixedly connected via the fixed connecting member.

[0013] In a preferred embodiment, the machine body comprises a vertically extending stand; two test mechanisms are supported by the stand respectively, and are spaced apart from each other and the axes of the two driving rods coincide with each other; the ends of the two driving rods away from the third connecting seat are opposite to each other and are fixedly connected via a synchronizing member; a driving device drivingly connected to the synchronizing member is fixed in the stand; Furthermore, the two sealing covers are respectively fixed on a sliding frame, and the vertical frame is provided with a linear guide rail matched with the sliding frame and a driving mechanism connected to the sliding frame.

[0014] Compared with the prior art, the present invention has the following beneficial technical effects: 1. The fatigue life test of bellows can be carried out under normal pressure, external vacuum and internal vacuum. It has strong applicability, especially can meet the vacuum test requirements of welded bellows, and improve the objectivity and accuracy of welded bellows test data.

[0015] 2. The two test institutions work together to significantly improve the test efficiency. During the test, the load fluctuation is small, the drive and transmission system works stably, and the energy efficiency is high. In particular, the rebound force of the bellows and the reverse load generated by the atmospheric pressure can be recycled to avoid energy waste, significantly reduce the energy consumption of tooling operation, and save test costs.

[0016] 3. The overall structure is simple and reasonable, especially the gas path and the sealing cover adopt an extremely simplified design, and the tightness is easy to ensure, making the bellows fatigue life test tooling easy to manufacture and low in cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly introduced below. Obviously, the drawings in the following description only relate to some embodiments of the present invention, but are not intended to limit the present invention.

[0018] Figure 1 It is a schematic diagram of the overall structure of the bellows fatigue life test tool in the embodiment.

[0019] Figure 2 Schematic diagram of the coordination structure between two testing mechanisms and the machine body in the embodiment.

[0020] Figure 3 Schematic diagram of the structure of the test mechanism in the embodiment.

[0021] Figure 4 Schematic diagram of the working state of the bellows fatigue life test tool in the normal pressure test mode in the embodiment.

[0022] Figure 5 Schematic diagram of the working state of the bellows fatigue life test tool in the internal vacuum test mode in the embodiment.

[0023] Figure 6 Schematic diagram of the working state of the bellows fatigue life test tool in the external vacuum test mode in the embodiment.

[0024] Figure 7 Schematic diagram of the coordination structure between the two testing mechanisms and the machine body when the synchronizer is a connecting rod mechanism in the embodiment.

[0025] Figure 8 Schematic diagram of the coordination structure between the two testing mechanisms and the machine body when the synchronizer is a gear transmission mechanism in the embodiment.

[0026] In the figure: 1. body, 2. sealing cover, 3. exhaust hose, 4. second connecting seat, 5. synchronization part, 6. sealing gasket, 7. driving rod, 8. third connecting seat, 9. stand, 10. first connecting seat, 11. chassis, 12. top plate, 13. vacuum detection device, 14. through joint, 15. support column, 16. vent hole, 17. sliding frame, 18. driving mechanism, 19. linear guide rail, 20. suction hole, 21. driving device, 22. vacuum generating system, 23. connecting rod mechanism, 24. gear transmission mechanism. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] See also Figure 1-Figure 6 As shown, an embodiment discloses a bellows fatigue life test fixture, including a body 1, in which a drive device 21, a control system and two sets of test mechanisms are installed; the test mechanism includes a chassis 11, a top plate 12, a drive rod 7 and a sealing cover 2.

[0029] The bottom plate 11 and the top plate 12 are fixed on the body 1 and spaced apart. A first connection seat 10 and a second connection seat 4 are respectively installed and fixed on opposite sides of the bottom plate 11 and the top plate 12. The first connection seat 10 and the second connection seat 4 can be sealed and connected to the ends of the bellows. The bottom plate 11 is provided with a vent hole 16 for connecting the inner cavity of the bellows with the atmosphere. The top plate 12 is connected with an exhaust hose 3 and is provided with an air suction hole 20 for connecting the inner cavity of the bellows with the exhaust hose 3. The driving rod 7 is perpendicular to the chassis 11, and the driving rod 7 passes through the chassis 11. A third connecting seat 8 is fixed on the driving rod 7, and the third connecting seat 8 can be sealed and connected with the end of the corrugated pipe and block the end of the corrugated pipe; the third connecting seat 8 is located between the first connecting seat 10 and the second connecting seat 4, and the three are distributed along the length direction of the driving rod 7; The sealing cover 2 can be combined with and separated from the bottom plate 11. The sealing cover 2 adopts a closed design, is cylindrical, has an open end, and the open end can be sealed and docked with the bottom plate 11. To ensure the sealing performance, a sealing gasket 6 can be installed on the matching surface of the sealing cover 2 and the bottom plate 11; when the sealing cover 2 is sealed and docked with the bottom plate 11, the top plate 12 and the third connecting seat 8 are sealed inside the sealing cover 2; a through joint 14 is sealed and fixed on the side wall of the sealing cover 2, and the exhaust hose 3 extends into the sealing cover 2 and is connected with the vacuum generating system 22 through the through joint 14; The two driving rods 7 in the two sets of test mechanisms are connected by the synchronization member 5, so that the two driving rods 7 can transfer kinetic energy. The synchronization member 5 or one driving rod 7 is connected to the driving device 21, and the two driving rods 7 are driven by the driving device 21 to move synchronously; the synchronous movement only refers to the same stroke, moving speed, and reciprocating frequency, but does not mean that the moving directions of the two driving rods 7 must be the same; the control system can control the operating state of the driving device 21, and then the position, moving speed, stroke and reciprocating frequency of the two driving rods 7 can be set and regulated; after the two sets of test mechanisms install and fix the bellows in the same way, the two driving rods 7 move synchronously and reciprocatingly during the operation of the tooling, and when one bellows stretches, the other bellows contracts, and this is performed alternately.

[0030] The working principle and test method of this bellows fatigue life test tool are as follows: Before the test, the parameters such as the stroke, moving speed, and reciprocating times of the driving rod are set according to the test requirements, and the corresponding test mode is selected, including the normal pressure test mode, the internal vacuum test mode, and the external vacuum test mode.

[0031] Normal pressure test mode: like Figure 4 As shown, two bellows to be tested are fixed on two test mechanisms in the same installation manner; specifically, one end of the bellows is fixed on the first connecting seat 10 or the second connecting seat 4, which can be selected according to the convenience of operation, and the other end of the bellows is fixed on the third connecting seat 8; the test tooling is started, and the two bellows are alternately extended and retracted in a normal pressure environment until the test is completed or the termination condition is reached.

[0032] Internal vacuum test mode: like Figure 3 , Figure 5As shown, two bellows to be tested are respectively installed and fixed on two testing mechanisms; specifically, one end of the bellows is sealed and fixed on the second connecting seat 4, and the other end is sealed and fixed on the third connecting seat 8. At this time, the vacuum generating system 22 is connected to the inside of the bellows through the through joint 14, the vacuum hose 3 and the suction hole 20, and the inside of the bellows can be evacuated to form an internal vacuum environment; the test tooling is started, and the two bellows are alternately extended and retracted in the internal vacuum environment until the test is completed or the termination condition is reached.

[0033] External vacuum test mode: like Figure 3 , Figure 6 As shown, two bellows to be tested are respectively installed and fixed on two testing mechanisms; specifically, one end of the bellows is sealed and fixed on the first connecting seat 10, and the other end is sealed and fixed on the third connecting seat 8, and the position of the sealing cover 2 is adjusted so that the open end of the sealing cover 2 is sealed and connected to the chassis 11. At this time, the sealing cover 2 and the bellows form a closed interlayer space, and the vacuum generating system 22 is connected to the interlayer space through the through joint 14, the vacuum hose 3 and the suction hole 20, and the interlayer space can be evacuated to form an external vacuum environment, and the inner cavity of the bellows is kept in communication with the atmosphere through the vent 16; the test tooling is started, and the two bellows are alternately extended and retracted in the external vacuum environment until the test is completed or the termination condition is reached.

[0034] The bellows fatigue life test tool has the above three test modes to choose from, so that bellows used in different working scenarios can be tested. It is especially suitable for fatigue life testing of welded bellows, which can improve the objectivity and accuracy of test data.

[0035] The bellows fatigue life test fixture adopts a dual test mechanism design, which can test two bellows at the same time, significantly improving the test efficiency. At the same time, the technical effects achieved in terms of operation stability and energy-saving performance are also quite significant. The reasons are: See also Figure 4-Figure 6 As shown, when the two test mechanisms work together, one bellows stretches and the other bellows contracts, and in this way, the overall load fluctuation of the drive device 21 is small, so that it can operate with a constant output power, improve the energy efficiency ratio and working stability, and effectively avoid the increased wear of the transmission system caused by load fluctuations. At the same time, during the test process, the rebound force of the bellows and the atmospheric pressure will generate a reverse load on the drive rod 7. The reverse load on one drive rod 7 can provide a driving effect for the other drive rod 7, realizing the recycling of the reverse load, avoiding energy waste, significantly reducing the operating energy consumption of the drive device 21, and saving test costs.

[0036] In the present bellows fatigue life test fixture, the design of the gas circuit is very clever. The switching between the internal vacuum test mode and the external vacuum test mode is realized by installing the bellows, and the same gas circuit is used for vacuuming. There is no need to set up branch gas circuits and reversing devices. The gas circuit is significantly simplified, avoiding the high failure rate caused by nodes and electronic control components, and the air tightness is more stable. The sealing cover 2 has a simple structure, the tightness is easy to ensure, and the assembly and separation operations are convenient and quick. Therefore, the present bellows fatigue life test fixture is easy to manufacture and the implementation cost is low.

[0037] More specifically, the sealing cover 2 is made of transparent material to facilitate observation of the test situation; the driving device 21 is selected from one of the devices such as a linear motor, a hydraulic cylinder, a pneumatic cylinder, an electric actuator, etc. with a linear driving function.

[0038] In this bellows fatigue life test tool, the exhaust hose 3 is arranged between the third connecting seat 8 and the sealing cover 2 to ensure that the suction hole 20 is connected with the vacuum generating system 22 and the position of the sealing cover 2 can be adjusted. When the sealing cover 2 is combined with the chassis 11, the exhaust hose 3 will be completely received in the sealing cover 2. In order to prevent the exhaust hose 3 from sagging and hindering the movement of the third connecting seat 8 or the extension and contraction of the bellows, the exhaust hose 3 can adopt a spring telescopic hose, or auxiliary components such as a spiral protective cover or a drag chain can be provided outside the exhaust hose 3 to guide the direction of the exhaust hose when it is bent to avoid forming space obstacles with other components.

[0039] In order to further improve the applicability of the bellows fatigue life test tool for bellows, in a preferred embodiment: The position of the third connecting seat 8 on the driving rod 7 is adjustable to be suitable for bellows with different lengths and telescopic amounts; the specific matching structure of the third connecting seat 8 and the driving rod 7 has multiple implementations, for example, the third connecting seat 8 is sleeved on the driving rod 7 and the two are sealed and slidably matched, and a locking member is provided to lock the third connecting seat 8 and the driving rod 7 in a pre-adjusted position; for example, Figure 2 , Figure 3 As shown, the driving rod 7 is a telescopic rod, and the position of the third connecting seat 8 is adjusted by telescoping the driving rod 7; like Figure 2 , Figure 3As shown, the first connecting seat 10 and the second connecting seat 4 are respectively fixed to the chassis 11 and the top plate 12 in a detachable manner, and the third connecting seat 8 is detachably fixed to the driving rod 7, and the detachable manner includes common means such as bolt fixing and clamping; the first connecting seat 10, the second connecting seat 4 and the third connecting seat 8 have various designs, such as flange joints, threaded joints, quick joints or clamps that can seal and fix the ends of the bellows. When the bellows is tested, the first connecting seat 10, the second connecting seat 4 and the third connecting seat 8 are replaced accordingly to match the joint types at both ends of the bellows.

[0040] See also Figure 6 As shown, in the external vacuum test mode, after the sealing cover 2 and the bottom plate 11 are combined, a closed interlayer space should be formed between the sealing cover 2 and the bellows, and the matching structure of the bottom plate 11 and the driving rod 7 and the supporting structure of the top plate 12 need to consider the influence on the airtightness of the interlayer space; in a preferred embodiment: like Figure 3 , Figure 6 As shown, the driving rod 7 passes through the chassis 11 through the vent hole 16, and when the two ends of the bellows are respectively fixed to the first connection seat 10 and the third connection seat 8, the driving rod 7 is located inside the bellows. As a result, the matching gap between the driving rod 7 and the chassis 11 is located outside the interlayer space, and no sealing is required, which is easy to implement; A plurality of vertically extending support columns 15 are fixed on the bottom plate 11, and the top plate 12 is supported and fixed by the support columns 15; therefore, when the sealing cover 2 is combined with the bottom plate 11, the top plate 12 and its supporting structure are both located inside the sealing cover 2, and thus will not affect the airtightness of the interlayer space. At the same time, the sealing cover 2 does not need to make space avoidance for the supporting structure of the top plate 12, and thus a more complete integrated structure can be adopted.

[0041] like Figure 3 As shown, in a preferred embodiment, the through-joint 14 is connected with a vacuum detection device 13 for detecting the internal vacuum degree thereof, such as a thermocouple vacuum gauge, an ionization vacuum gauge, etc., so that the control system can determine whether the bellows is leaking according to the vacuum degree data fed back by the vacuum detection device 13; thanks to the fact that both the external vacuum test mode and the internal vacuum test mode use the same air circuit for vacuum extraction, therefore, in both the external vacuum test mode and the internal vacuum test mode, the vacuum detection device 13 can play the above-mentioned expected role.

[0042] In the present bellows fatigue life test fixture, the function of the synchronizer 5 is to connect the two drive rods 7 and ensure that the two drive rods 7 can drive the two bellows to extend and retract alternately. According to the different installation methods of the two test mechanisms, the synchronizer 5 has multiple implementation methods, specifically: See also Figure 7 , Figure 8 As shown, for example, when the driving rods 7 of the two test mechanisms are both located in the vertical direction and the installation directions of the two test mechanisms on the machine body 1 are consistent, the synchronizer 5 can select a gear transmission mechanism 24 or a connecting rod mechanism 23 with a direction switching function; specifically, the gear transmission mechanism 24 is composed of a gear and a rack meshing, the gear is rotatably fixed on the machine body 1, and the rack is fixed to one end of the two driving rods 7 away from the third connecting seat 8, thereby realizing a transmission connection between the two driving rods 7; the connecting rod mechanism 23 includes a connecting rod, the middle of the connecting rod has a hinge point and is rotatably connected to the machine body 1, and the two ends of the connecting rod are movably connected to one end of the two driving rods 7 away from the third connecting seat 8; when the synchronizer 5 adopts the above structure, when one driving rod 7 moves upward, the other driving rod 7 moves downward, thereby realizing the technical purpose of alternating extension and contraction of the two bellows; See also Figure 1 , Figure 2 As shown, for example, when the driving rods 7 of the two test mechanisms are both located in the vertical direction and the installation directions of the two test mechanisms on the machine body 1 are opposite, the synchronizer 5 can select a fixed connecting piece, and the ends of the two driving rods 7 away from the third connecting seat 8 are fixedly connected via the fixed connecting piece. Thus, the two driving rods 7 are driven to reciprocate in the same direction. Based on the opposite installation directions of the two test mechanisms, the technical purpose of alternating extension and retraction of the two bellows can be achieved.

[0043] See also Figure 1-Figure 3 As shown, in a preferred embodiment, the machine body 1 includes a vertically extending stand 9, and the two test mechanisms are supported by the stand 9 respectively, and are spaced apart from each other and the axes of the two driving rods 7 coincide with each other; the ends of the two driving rods 7 away from the third connecting seat 8 are opposite to each other and are fixedly connected via a synchronous member 5, and the synchronous member 5 is preferably a coupling; the driving device 21 is fixed in the stand 9 and is in transmission connection with the synchronous member 5; Furthermore, the two sealing covers 2 are each fixed on a sliding frame 17, and the vertical frame 9 is provided with a linear guide rail 19 cooperating with the sliding frame 17 and a driving mechanism 18 connected to the sliding frame 17. The driving mechanism 18 is used to adjust the position of the sealing cover 2 to realize the automatic operation of the combination and separation of the sealing cover 2; the driving mechanism 18 can be selected from one of the devices such as a linear motor, a hydraulic cylinder, a pneumatic cylinder, an electric actuator, etc. with a linear driving function.

[0044] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present invention.

Claims

1. A bellows fatigue life test tool, comprising a body and a test mechanism; characterized in that: There are two sets of testing institutions, each set of testing institutions includes: The bottom plate and the top plate are fixed on the machine body, and the first connecting seat and the second connecting seat are fixed on the opposite sides respectively; the bottom plate is provided with a vent hole, and the top plate is provided with an air suction hole and is connected with an air extraction hose; A driving rod vertically passes through the chassis, a third connecting seat is fixed on the driving rod, and the third connecting seat is located between the first connecting seat and the second connecting seat; The sealing cover can be sealed and docked with the bottom plate to seal the top plate and the third connecting seat inside; a through joint is fixed on the side wall of the sealing cover, and the air extraction hose extends into the sealing cover and is connected to the vacuum generating system through the through joint; The two driving rods are connected through a synchronous member. After the two testing mechanisms are installed with bellows in the same way, during the reciprocating movement of the two driving rods, one bellows stretches while the other bellows contracts, and the two bellows are alternately moved.

2. The bellows fatigue life test tool according to claim 1, characterized in that: The position of the third connecting seat on the driving rod is adjustable.

3. The bellows fatigue life test tool according to claim 1, characterized in that: The first connecting seat and the second connecting seat are respectively fixed on the bottom plate and the top plate in a detachable manner, and the third connecting seat is fixed on the driving rod in a detachable manner.

4. The bellows fatigue life test tool according to claim 1, characterized in that: The driving rod passes through the chassis through the vent hole, and when the two ends of the bellows are respectively fixed to the first connecting seat and the third connecting seat, the driving rod is located inside the bellows.

5. The bellows fatigue life test tool according to claim 1, characterized in that: A plurality of vertically extending support columns are fixed on the bottom plate, and the top plate is supported and fixed by the support columns.

6. The bellows fatigue life test tool according to claim 1, characterized in that: The through-joint is connected with a vacuum detection device for detecting the vacuum degree inside the through-joint.

7. The bellows fatigue life test tool according to claim 1, characterized in that: The synchronizer is a gear transmission mechanism or a connecting rod mechanism, which is rotatably connected to the machine body, and one end of the two driving rods away from the third connecting seat is connected through the gear transmission mechanism or the connecting rod mechanism.

8. The bellows fatigue life test tool according to claim 1, characterized in that: The synchronizer is a fixed connection member, and one end of the two driving rods away from the third connection seat is fixedly connected via the fixed connection member.

9. The bellows fatigue life test tool according to claim 1, characterized in that: The machine body includes a vertically extending stand; two test mechanisms are supported by the stand respectively, spaced apart up and down and the axes of the two driving rods coincide; the two driving rods are opposite to each other at one end away from the third connecting seat and are fixedly connected via a synchronizing member; a driving device is fixed in the stand and is transmission-connected to the synchronizing member.

10. The bellows fatigue life test tool according to claim 9, characterized in that: The two sealing covers are respectively fixed on a sliding frame, and the vertical frame is provided with a linear guide rail matched with the sliding frame and a driving mechanism connected with the sliding frame in transmission.

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