A fatigue life test device for metal bellows used in vacuum interrupter

Abstract

The present invention relates to a fatigue life test device for a metal bellows for a vacuum interrupter, comprising a frame, a test cylinder for mounting a bellows to be tested and a driving device, a pull rod is installed in the test cylinder, the pull rod is respectively connected to the driving device and the bellows to be tested in the test cylinder, so that the driving device drives the bellows to be tested to extend and retract through the pull rod, a connecting rod is hinged at the driving end of the driving device, and the connecting rod is connected to the pull rod through a hook structure, and an energy storage spring and an unlocking member are also provided on the frame, the energy storage spring is elastically deformed and stores energy when the driving device drives the pull rod to move through the connecting rod, and the unlocking member drives the connecting rod to move when the connecting rod moves to a set position, so that the connecting rod and the pull rod are separated from the hook structure, and then the energy storage spring releases energy. The present invention utilizes the elastic deformation of the energy storage spring to store energy, and after the connecting rod and the pull rod are separated, the energy released by the energy storage spring is utilized to enable the bellows to be tested to have a higher tensile and / or compression speed.

Description

Technical Field

[0001] The invention relates to a metal bellows fatigue life test device, in particular to a metal bellows fatigue life test device for a vacuum interrupter. Background Art

[0002] Traditional high-voltage switches use SF6 gas for insulation and arc extinguishing. SF6 gas leakage seriously pollutes the environment. As environmental governance efforts and environmental pressure gradually increase, traditional switches are bound to be eliminated, and environmentally friendly switches are bound to be developed rapidly. At present, in the field of medium and low voltage switches, vacuum switches have largely replaced traditional gas switches. In the field of high voltage, due to the characteristics of high switch opening and closing speed, large opening distance, and high insulating gas pressure, higher requirements are placed on vacuum interrupter chambers and their components.

[0003] As a sealing and connecting element in a vacuum arc extinguishing chamber, the metal bellows is a core component in the vacuum arc extinguishing chamber. After the bellows are manufactured, they need to be verified and evaluated according to the test requirements such as the switch opening and closing speed, opening distance, and gas pressure. At present, the bellows life verification devices of medium and low pressure vacuum arc extinguishing chambers are all carried out at low speeds. For example, a bellows external pressure fatigue test device disclosed in the Chinese patent document with the authorization announcement number CN102156030B includes a frame, a cylinder is provided on the frame, a bellows to be tested is fixed in the cylinder, the bellows to be tested is connected to a positioning rod, and the side wall of the cylinder is connected to a pressure source through a pipeline, and the pressure source is used to pressurize the annular space surrounded by the bellows and the cylinder; a crank slider mechanism is also provided on the frame, and the crank slider mechanism is used to drive the positioning rod to move, so as to drive the bellows to be tested to move up and down, so as to achieve the purpose of fatigue testing the bellows.

[0004] The test speed of the above-mentioned bellows external pressure fatigue test equipment is relatively low and cannot simulate the high opening and closing speed working conditions of the high-voltage switch, and therefore cannot meet the requirements of the metal bellows fatigue test of the high-voltage vacuum interrupter. Summary of the invention

[0005] The purpose of the present invention is to provide a metal bellows fatigue life test device for a vacuum arc chamber to solve the technical problem that the test speed of the bellows external pressure fatigue test equipment in the prior art is relatively low and cannot simulate the high opening and closing speed of the high-voltage switch.

[0006] To achieve the above-mentioned purpose, the technical solution of the fatigue life test device of the metal bellows for vacuum arc chamber of the present invention is: the fatigue life test device of the metal bellows for vacuum arc chamber comprises a frame, the frame is provided with a test cylinder for installing the bellows to be tested and a driving device, a pull rod is passed through the test cylinder, the pull rod is respectively connected with the driving device and the bellows to be tested in the test cylinder, so that the driving device drives the bellows to be tested to extend and retract through the pull rod, the driving end of the driving device is hinged with a connecting rod, and the connecting rod is connected to the pull rod through a hook structure, and an energy storage spring and an unlocking member are also provided on the frame, the energy storage spring is used to store energy by elastic deformation when the driving device drives the pull rod to move through the connecting rod, and the unlocking member is used to drive the connecting rod to move when the connecting rod moves to a set position, so that the connecting rod and the pull rod are separated from each other at the hook structure, thereby causing the energy storage spring to release energy.

[0007] The beneficial effect is: when the driving device is working, the connecting rod drives the pull rod to move so that the energy storage spring undergoes elastic deformation and stores energy. When the connecting rod moves to the set position, the unlocking member drives the connecting rod to move so that the connecting rod and the pull rod are separated from the hook structure, thereby causing the energy storage spring to release energy. The energy released by the energy storage spring is used to make the bellows to be tested have a higher tensile and / or compression speed, thereby meeting the requirements of the metal bellows fatigue test of the high-voltage vacuum arc chamber.

[0008] As a further improvement, the hook structure includes a hanging groove and a hanging shaft, one of the connecting rod and the pulling rod is provided with a hanging groove, and the other of the connecting rod and the pulling rod is provided with a hanging shaft.

[0009] The beneficial effect is that the structures of the hanging groove and the hanging shaft are relatively simple, which is conducive to the hooking and matching of the two.

[0010] As a further improvement, a corresponding rod provided with the hanging groove is provided with a guiding inclined surface for guiding the hanging shaft to enter the hanging groove.

[0011] The beneficial effect is that the guiding inclined surface is used to guide the hanging shaft into the hanging groove, which is conducive to the hanging shaft being automatically hung into the hanging groove, thereby realizing the automated test.

[0012] As a further improvement, the unlocking member is an unlocking crank arm, which is provided with a long hole extending along its length direction, and the connecting rod is provided with a pin shaft sliding in the long hole. When the connecting rod moves to a set position, the end hole wall of the long hole pushes the pin shaft to separate the connecting rod from the pull rod.

[0013] The beneficial effect is that the long hole on the unlocking crank arm can guide the movement of the pin on the connecting rod, ensuring that the unlocking crank arm can stably separate the connecting rod from the pull rod.

[0014] As a further improvement, the energy storage spring is a compression spring sleeved on the pull rod.

[0015] The beneficial effect is that the two ends of the compression spring do not need to be fixed, which is conducive to the installation of the compression spring.

[0016] As a further improvement, the compression spring is located between the test cylinder and the driving device, the end of the pull rod away from the connecting rod extends from the side of the test cylinder away from the driving device, and the side of the test cylinder away from the driving device is provided with a speed measuring device sleeved outside the pull rod.

[0017] As a further improvement, the test cylinder includes a cylinder body and vertical plates connected to two ends of the cylinder body, and the test cylinder is fixed on the frame through the two vertical plates.

[0018] The beneficial effect is that the test cylinder is fixed on the frame by two vertical plates, and no additional fixing frame is required, which is conducive to simplifying the structure of the entire test device.

[0019] As a further improvement, the tube body is a transparent tube body.

[0020] The beneficial effect is that such a design makes it easy to observe the movement state of the bellows to be tested.

[0021] As a further improvement, the driving device includes a driving motor and a turntable, the turntable is connected to the output shaft of the driving motor, and the connecting rod is hinged on the turntable at one side of the output shaft of the driving motor.

[0022] The beneficial effect is that compared with the telescopic cylinder, the driving speed of the driving motor is faster, which is conducive to the connecting rod driving the energy storage spring to quickly store energy through the pull rod.

[0023] As a further improvement, the metal bellows fatigue life test device also includes a monitoring device with an inflation function and a pressure monitoring function, and an inflation pipeline and a pressure monitoring pipeline are connected between the test cylinder and the monitoring device.

[0024] The beneficial effect is that the monitoring device injects high-pressure gas into the annular space surrounded by the test cylinder and the bellows to be tested through the gas charging pipeline, so as to form a pressure difference between the inside and outside of the bellows to be tested, so as to simulate the real working environment of the metal bellows. The pressure monitoring pipeline is used to monitor the gas pressure in the annular space surrounded by the test cylinder and the bellows to be tested, so as to ensure that the pressure difference between the inside and outside of the bellows to be tested is the set pressure difference. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic structural diagram of a fatigue life test device for a metal bellows used in a vacuum interrupter of the present invention;

[0026] Figure 2 for Figure 1 Schematic diagram of the structure of the test cylinder;

[0027] Figure 3 for Figure 1Installation diagram of the middle energy storage spring;

[0028] In the figure: 11, frame; 12, monitoring device; 13, inflation pipeline; 14, pressure monitoring pipeline; 15, speed measuring device; 16, bellows to be tested; 17, cylinder body; 18, energy storage spring; 19, pull rod; 20, connecting rod; 21, unlocking crank arm; 22, turntable; 23, first vertical plate; 24, static flange; 25, dynamic flange; 26, connecting flange; 27, sealing ring; 28, second vertical plate; 29, first rod section; 30, second rod section; 31, spring seat; 32, third vertical plate; 33, hanging shaft; 34, hanging groove; 35, pin shaft; 36, long hole; 37, connecting hole; 38, first fixed rod; 39, second fixed rod; 40, guiding inclined plane. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention, that is, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present invention.

[0031] It should be noted that the terms that may appear, such as "first" and "second", etc., are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, terms such as "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "including one..." etc. do not exclude the existence of other identical elements in the process, method, article or device including the elements. In addition, the terms "front", "back", "up", "down", "left" and "right" are based on the orientation and positional relationship shown in the accompanying drawings, only for the convenience of describing the present invention, rather than indicating that the device or component referred to must have a specific orientation, and therefore cannot be understood as a limitation of the present invention.

[0032] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0033] Embodiment 1 of the fatigue life test device of the metal bellows for vacuum interrupter of the present invention:

[0034] like Figure 1 As shown, the fatigue life test device for a metal bellows for a vacuum interrupter comprises a frame 11, on which a first vertical plate 23, a second vertical plate 28 and a third vertical plate 32 are arranged in sequence from left to right.

[0035] like Figure 1 and Figure 2 As shown, a cylinder body 17 is fixed between the first vertical plate 23 and the second vertical plate 28. The cylinder body 17 and the two vertical plates together form a test cylinder, which is used to install the bellows 16 to be tested. A connecting hole 37 is provided on the first vertical plate 23 to connect the inner cavity of the bellows 16 to be tested with the outside.

[0036] In this embodiment, the cylinder body 17 is made of a transparent material so that the movement state of the bellows 16 to be tested can be observed by a high-speed camera.

[0037] In this embodiment, a first rod section 29 is provided in the test cylinder, a connecting flange 26 is fixed on the first rod section 29, and the left and right ends of the first rod section 29 both extend out of the test cylinder; a speed measuring device 15 is fixed on the left side of the first vertical plate 23, and the speed measuring device 15 is sleeved outside the first rod section 29, and the tensile and compressive speeds of the bellows 16 to be tested are obtained by monitoring the moving speed of the first rod section 29. The speed measuring device includes a speed sensor.

[0038] In this embodiment, a first fixing rod 38 is provided between the first vertical plate 23 and the second vertical plate 28 on the outer side of the barrel body 17, and multiple first fixing rods 38 are arranged at intervals along the circumference of the barrel body 17 to ensure the stability of the fixation of the first vertical plate 23, the second vertical plate 28 and the barrel body 17.

[0039] like Figure 1 As shown, a monitoring device 12 with an inflation function and a pressure monitoring function is fixedly provided on the left side of the frame 1. An inflation pipeline 13 and a pressure monitoring pipeline 14 are connected between the monitoring device 12 and the test cylinder. The monitoring device 12 injects high-pressure gas into the annular space surrounded by the test cylinder and the bellows 16 to be tested through the inflation pipeline 13, so as to form a pressure difference between the inside and outside of the bellows 16 to be tested, so as to simulate the real working environment of the metal bellows. The pressure monitoring pipeline 14 is used to monitor the gas pressure in the annular space surrounded by the test cylinder and the bellows 16 to be tested, so as to ensure that the pressure difference between the inside and outside of the bellows 16 to be tested is the set pressure difference.

[0040] like Figure 1 and Figure 3 As shown, a second rod segment 30 and an energy storage spring 18 are provided between the second vertical plate 28 and the third vertical plate 32, the left end of the second rod segment 30 is connected to the right end of the first rod segment 29, and the right end of the second rod segment 30 extends out of the third vertical plate 32. The first rod segment 29 and the second rod segment 30 together form a pull rod 19.

[0041] In this embodiment, the energy storage spring 18 is a compression spring and is sleeved on the second rod segment 30. The energy storage spring 18 is used to store energy by elastic deformation when the connecting rod 20 drives the pull rod 19 to move to the right; a spring seat 31 is provided at the left end of the second rod segment 30, one end of the energy storage spring 18 presses on the spring seat 31, and the other end of the energy storage spring 18 presses on the third vertical plate 32.

[0042] In this embodiment, a second fixing rod 39 is provided between the second vertical plate 28 and the third vertical plate 32 on the outer side of the energy storage spring 18 , and a plurality of second fixing rods 39 are arranged at intervals along the circumference of the cylinder body 17 to ensure the stability of the fixation of the second vertical plate 28 and the third vertical plate 32 .

[0043] like Figure 1 As shown, a driving device is further provided on the frame 1 on the right side of the third vertical plate 32, and the driving device includes a driving motor (not shown) and a turntable 22, the turntable 22 is connected to the output shaft of the driving motor, and a connecting rod 20 is hinged on the turntable 22 on one side of the output shaft of the driving motor, that is, the hinge position of the connecting rod 20 on the turntable 22 is eccentrically arranged. Among them, the turntable 22 constitutes the driving end of the driving device, and the number of tests of the bellows to be tested can be calculated according to the number of reciprocating rotations of the driving motor.

[0044] In this embodiment, a hook structure is provided between the connecting rod 20 and the pull rod 19. Specifically, Figure 3 As shown, the hook structure includes a hanging groove 34 and a hanging shaft 33, wherein the hanging groove 34 is arranged on the second rod section 30 of the pull rod 19, and the hanging shaft 33 is arranged on the connecting rod 20, and the connecting rod 20 can separate the hanging shaft 33 from the hanging groove 34 under the action of an external force. Among them, a guiding inclined surface 40 is arranged at the right end of the pull rod 19, and the guiding inclined surface 40 is used to guide the hanging shaft 33 into the hanging groove 34. In other embodiments, the hanging shaft can be arranged on the second rod section of the pull rod, and the hanging groove can be arranged on the connecting rod.

[0045] In this embodiment, an unlocking crank arm 21 is also hinged on the frame 11, and the unlocking crank arm 21 constitutes an unlocking member. The upper end of the unlocking crank arm 21 is provided with a long hole 36 extending along its length direction, and the connecting rod 20 is provided with a pin shaft 35 sliding in the long hole 36. When the connecting rod 20 moves to the set position, the lower end hole wall of the long hole 36 pushes the pin shaft 35 to separate the connecting rod 20 and the pull rod 19 from the hook structure, thereby allowing the energy storage spring 18 to release energy. The energy released by the energy storage spring 18 is used to ensure that the bellows 16 to be tested has a higher tension and compression speed.

[0046] During the test, taking two bellows 16 to be tested with the same structure as an example, the static flange 24 and the dynamic flange 25 are respectively welded at both ends of the bellows 16 to be tested by vacuum brazing. Figure 2 As shown, the static flange 24 is arranged at the opposite ends of the two bellows 16 to be tested, and the dynamic flange 25 is arranged at the opposite ends of the two bellows 16 to be tested. Afterwards, the two dynamic flanges 25 are fixed on the connecting flange 26 of the first rod section 29, and the two static flanges 24 are respectively fixed on the first vertical plate 23 and the second vertical plate 28, and a sealing ring 27 is arranged between the static flange 24 and the corresponding vertical plate to ensure the sealing of the annular space surrounded by the two bellows 16 to be tested and the test cylinder. Then, the annular space surrounded by the bellows 16 to be tested and the test cylinder is filled with high-pressure gas so that the inside and outside of the bellows 16 to be tested have a set pressure difference.

[0047] When the driving motor rotates forward, the connecting rod 20 drives the pull rod 19 to move rightward, and the energy storage spring 18 on the pull rod 19 is compressed to store energy. After the connecting rod 20 moves to the right for a certain position, the lower end hole wall of the long hole 36 pushes the pin shaft 35 to make the left end of the connecting rod 20 move upward, so that the hanging shaft 33 is disengaged from the hanging groove 34, and the connecting rod 20 is separated from the pull rod 19, and then the energy storage spring 18 releases energy. The energy released by the energy storage spring 18 is used to ensure that the bellows 16 to be tested has a high tension and compression speed. After that, the driving motor rotates in the opposite direction, so that the connecting rod 20 moves to the left. Under the guidance of the guiding inclined surface 40, the hanging shaft 33 on the connecting rod 20 automatically re-enters the hanging groove 34 to perform the next energy storage and release of the energy storage spring 18. This reciprocating process is repeated to complete the fatigue test of the bellows 16 to be tested.

[0048] Embodiment 2 of the fatigue life test device of the metal bellows for vacuum interrupter of the present invention:

[0049] The difference between this embodiment and embodiment 1 is that in embodiment 1, the hook structure includes a hanging groove and a hanging shaft, the hanging groove is arranged on the pull rod, and the hanging shaft is arranged on the connecting rod. In this embodiment, the hook structure includes two hanging grooves, the two hanging grooves are arranged on the pull rod and the connecting rod respectively, the convex part between the hanging groove on the connecting rod and the guiding inclined surface is used to snap into the hanging groove on the pull rod, and the convex part between the hanging groove on the pull rod and the guiding inclined surface is used to snap into the hanging groove on the connecting rod.

[0050] Embodiment 3 of the fatigue life test device of the metal bellows for vacuum interrupter of the present invention:

[0051] The difference between this embodiment and embodiment 1 is that in embodiment 1, a guiding slope is provided at the right end of the pull rod, and the guiding slope is used to guide the hanging shaft into the hanging groove. In this embodiment, no guiding slope is provided at the right end of the pull rod, and when the energy storage spring releases energy, the connecting rod is manually hung on the pull rod during the movement of the connecting rod to the left. In other embodiments, an additional pushing device can be provided to push up the connecting rod during the movement of the connecting rod to the left, and when the connecting rod continues to move to the left for a distance, the pushing of the connecting rod is released, so that the connecting rod falls and hangs on the pull rod.

[0052] Embodiment 4 of the fatigue life test device of the metal bellows for vacuum interrupter of the present invention:

[0053] The difference between this embodiment and embodiment 1 is that in embodiment 1, the unlocking member is an unlocking crank arm, and the unlocking crank arm is provided with a long hole extending along its length direction, and the connecting rod is provided with a pin shaft sliding in the long hole, and when the connecting rod moves to the set position, the end hole wall of the long hole pushes the pin shaft to separate the connecting rod from the pull rod. In this embodiment, the unlocking member is an unlocking protrusion located below the connecting rod, and before the connecting rod moves to the right, there is a distance between the connecting rod and the pushing protrusion. Under the drive of the turntable, the right end of the connecting rod moves downward, so that the connecting rod gradually approaches the pushing protrusion, and is finally pushed up by the pushing protrusion to separate the connecting rod from the pull rod.

[0054] Embodiment 5 of the fatigue life test device for metal bellows used in vacuum interrupter of the present invention:

[0055] The difference between this embodiment and embodiment 1 is that in embodiment 1, the energy storage spring is a compression spring sleeved on the pull rod. In this embodiment, the energy storage spring is a tension spring, one end of which is connected to the second vertical plate, and the other end of which is connected to the second rod section of the pull rod.

[0056] Embodiment 6 of the fatigue life test device for metal bellows used in vacuum interrupter of the present invention:

[0057] The difference between this embodiment and embodiment 1 is that in embodiment 1, the compression spring is located between the test cylinder and the driving device, the left end of the pull rod away from the connecting rod extends out from the left side of the test cylinder, and the left side of the test cylinder is provided with a speed measuring device sleeved outside the pull rod. In this embodiment, no speed measuring device is provided, and the compression spring is provided on the left side of the test cylinder.

[0058] Embodiment 7 of the fatigue life test device for metal bellows used in vacuum interrupter of the present invention:

[0059] The difference between this embodiment and embodiment 1 is that in embodiment 1, the barrel body is a transparent barrel body. In this embodiment, the barrel body is a non-transparent barrel body, and an observation window is provided on the barrel body.

[0060] Embodiment 8 of the fatigue life test device of the metal bellows for vacuum interrupter of the present invention:

[0061] The difference between this embodiment and embodiment 1 is that in embodiment 1, the driving device includes a driving motor and a turntable, the turntable is connected to the output shaft of the driving motor, and the connecting rod is hinged on the turntable at one side of the output shaft of the driving motor. In this embodiment, the driving device is a hydraulic cylinder, and the piston rod of the hydraulic cylinder is hinged to the connecting rod.

[0062] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the contents of the description and drawings of the present invention should also be included in the protection scope of the present invention.

Claims

1. A fatigue life test device for a metal bellows for a vacuum interrupter, comprising a frame, a test cylinder for mounting the bellows to be tested and a driving device are provided on the frame, a pull rod is installed in the test cylinder, and the pull rod is respectively connected to the driving device and the bellows to be tested in the test cylinder, so that the driving device drives the bellows to be tested to expand and contract through the pull rod, characterized in that: A connecting rod is hinged at the driving end of the driving device, and the connecting rod is connected to the pull rod through a hook structure. An energy storage spring and an unlocking member are also provided on the frame. The unlocking member is an unlocking crank arm, and a long hole extending along its length is provided on the unlocking crank arm. A pin shaft sliding in the long hole is provided on the connecting rod. When the connecting rod moves to a set position, the end hole wall of the long hole pushes the pin shaft to separate the connecting rod from the pull rod. The energy storage spring is a compression spring sleeved on the pull rod, and the compression spring is located between the test cylinder and the driving device. The energy storage spring is used to store energy when the driving device drives the pull rod to move through the connecting rod and undergoes elastic deformation. The unlocking member is used to drive the connecting rod to move when the connecting rod moves to a set position, so that the connecting rod and the pull rod are separated from each other by the hook structure, thereby causing the energy storage spring to release energy.

2. The fatigue life test device for metal bellows for vacuum interrupter according to claim 1, characterized in that: The hook structure comprises a hanging groove and a hanging shaft. One of the connecting rod and the pulling rod is provided with the hanging groove, and the other of the connecting rod and the pulling rod is provided with the hanging shaft.

3. The fatigue life test device for metal bellows for vacuum interrupter according to claim 2, characterized in that: A corresponding rod provided with the hanging groove is provided with a guiding inclined surface for guiding the hanging shaft to enter the hanging groove.

4. The fatigue life test device for metal bellows for vacuum interrupter according to claim 1, characterized in that: One end of the pull rod away from the connecting rod extends from a side of the test cylinder away from the driving device, and a speed measuring device sleeved outside the pull rod is provided on the side of the test cylinder away from the driving device.

5. The fatigue life test device for metal bellows for vacuum interrupter according to claim 1, 2 or 3, characterized in that: The test cylinder comprises a cylinder body and vertical plates connected to two ends of the cylinder body, and the test cylinder is fixed on the frame through the two vertical plates.

6. The fatigue life test device for metal bellows for vacuum interrupter according to claim 5, characterized in that: The tube body is a transparent tube body.

7. The fatigue life test device for metal bellows for vacuum interrupter according to claim 1, 2 or 3, characterized in that: The driving device comprises a driving motor and a rotating disk, wherein the rotating disk is connected to the output shaft of the driving motor, and a connecting rod is hinged on the rotating disk at one side of the output shaft of the driving motor.

8. The fatigue life test device for metal bellows for vacuum interrupter according to claim 1, 2 or 3, characterized in that: The metal bellows fatigue life test device also includes a monitoring device with an inflation function and a pressure monitoring function. An inflation pipeline and a pressure monitoring pipeline are connected between the test cylinder and the monitoring device.

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