CN214621695U - Bellows life test device - Google Patents

Abstract

The utility model discloses a bellows life test device belongs to the experimental technical field of vacuum interrupter. This bellows life test device includes supporting component and moving part, and the moving part can support the component relatively and follow vertical direction reciprocating motion, and the sealed subassembly one-to-one that aerifys on the supporting component sets up with the sealed fixed subassembly on the moving part, and sealed subassembly and the sealed fixed subassembly configuration of aerifing are the both ends of sealing connection bellows to fill the gas of settlement pressure in to the bellows, the bellows is flexible under the condition that has pressure differential, and the simulation real operating mode can two at least bellows be tested, has improved detection efficiency.

Description

Bellows life test device

Technical Field

The utility model relates to a vacuum interrupter tests technical field, especially relates to a bellows life-span test device.

Background

The vacuum arc-extinguishing chamber is a core component of a vacuum switch, and a conductive loop of the vacuum arc-extinguishing chamber is composed of a static conductive rod, a static electrode, a dynamic electrode and a dynamic conductive rod when the vacuum arc-extinguishing chamber works under a vacuum condition. The movable conducting rod is driven by the switch operating mechanism to pull the electrode to realize the operation of opening and closing the switch. The key element for maintaining the vacuum state in the vacuum arc-extinguishing chamber when the movable conducting rod and the movable electrode move is the corrugated pipe. The corrugated pipe is in a corrugated thin-wall pipe structure, and is compressed or stretched in the moving process of the movable conducting rod and the movable electrode, but the corrugated pipe is always kept airtight. The mechanical life of the corrugated pipe generally determines the mechanical life of the vacuum arc-extinguishing chamber, and once the corrugated pipe is damaged and leaks, the vacuum state of the vacuum arc-extinguishing chamber cannot be maintained, and the vacuum arc-extinguishing chamber fails.

After the bellows part is manufactured, a sample is typically drawn for mechanical life testing on a dedicated life test stand. The general test device fixes two ports of the corrugated pipe between two fixing plates in a clamping manner, wherein one fixing plate can reciprocate under the driving of a motor through a connecting rod device, the corrugated pipe is repeatedly compressed or stretched, and the corrugated pipe is taken down to detect whether the corrugated pipe is damaged or leaked after the corrugated pipe reaches the specified times, so that the service life of the corrugated pipe is judged.

The device for prolonging the service life of the corrugated pipe has the defects that firstly, the inside and the outside of the corrugated pipe are both under the atmospheric condition, and no pressure difference exists between the inside and the outside, which is not consistent with the actual working state of the corrugated pipe; secondly, in the movement process of the corrugated pipe, the connection position of the corrugated pipe and the testing device is easy to loosen; thirdly, the testing arrangement at present stage can only detect a bellows once, has prolonged the experimental time, reduces the efficiency of software testing.

Therefore, it is desirable to provide a device for testing the service life of a corrugated pipe to solve the above problems.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a bellows life-span test device, the bellows can simulate real operational environment under sealed condition to improve efficiency of software testing.

In order to realize the purpose, the following technical scheme is provided:

a bellows life test device, comprising:

the supporting assembly comprises a supporting carrier plate and supporting guide rods, the supporting guide rods are fixed on the supporting carrier plate and vertically extend out, and at least two sets of sealing and inflating assemblies are arranged on the supporting carrier plate;

the movable piece is movably sleeved on the support guide rod and can reciprocate relative to the support assembly along the vertical direction, at least two sets of sealing and fixing assemblies are arranged on the movable piece, and the sealing and inflating assemblies and the sealing and fixing assemblies are arranged in one-to-one correspondence;

the seal inflation assembly and the seal fixing assembly are configured to seal two ends of a corrugated pipe and inflate gas with set pressure into the corrugated pipe.

As bellows life test device's alternative, sealed subassembly of aerifing includes aerifys connecting rod and first bracer, the one end of bellows cup joint in on the first bracer, first bracer is including the first tight portion of expanding and the first connecting portion that are linked together, the internal diameter of the tight portion of first expanding is along being close to the direction of first connecting portion reduces gradually, the head of aerifing the connecting rod be the round platform structure and with the internal face butt of the tight portion of first expanding, aerify the connecting rod the pole portion with first connecting portion spiro union, so that the external diameter of the tight portion of first expanding is adjustable and expands the bellows.

As an alternative of the bellows life test device, a first adjusting through groove is formed in the circumferential wall of the first expansion portion, and one end of the first adjusting through groove extends to the open end of the first expansion portion.

As an alternative of the bellows life test device, the bellows life test device further comprises an inflation device, and the inflation connecting rod is hollow inside and communicated with the inflation device.

As bellows life test device's alternative, sealed fixed subassembly includes fixed connecting rod and second bracer, bellows one end cup joint in on the second bracer, the second bracer is including the bloated tight portion of second and the second connecting portion that are linked together, the opening of the bloated tight portion of second is followed and is close to the direction of second connecting portion reduces gradually, fixed connecting rod's head be round platform structure and with the internal face butt of the bloated tight portion of second, fixed connecting rod's pole portion with the spiro union of second connecting portion, so that the external diameter of the bloated tight portion of second is adjustable and bloated tightly the bellows.

As an alternative of the bellows life test device, a second adjusting through groove is formed in the circumferential wall of the second expansion portion, and one end of the second adjusting through groove extends to the open end of the second expansion portion.

As an alternative of the corrugated pipe service life testing device, the moving part is a movable plate, the sealing and fixing assembly is detachably connected to the movable plate, the movable plate is communicated with a guide hole, and the supporting guide rod penetrates through the guide hole in a sliding mode and extends out of the guide hole.

As an alternative of the bellows service life testing device, the bellows service life testing device further comprises a driving device, and an output shaft of the driving device is connected with the movable member and used for driving the movable member to reciprocate relative to the supporting assembly.

As an alternative of the bellows service life testing device, the driving device is arranged on one side of the supporting component far away from the moving part, a central through hole is formed in the supporting carrier plate, the output shaft penetrates through the central through hole and extends out, and the extending end of the output shaft is connected with the moving part.

As an alternative of the corrugated pipe service life testing device, at least two first mounting holes are formed in the supporting carrier plate in a penetrating manner, and the at least two first mounting holes are arranged at intervals by taking the central through hole as a center.

Compared with the prior art, the beneficial effects of the utility model are that:

the utility model provides a bellows life test device, moving part movable sleeve establish support guide bar and can support the subassembly along vertical direction reciprocating motion relatively, be provided with two sets at least sealed subassembly of aerifing on the support plate, be provided with two sets at least sealed fixed subassemblies on the moving part, sealed subassembly of aerifing and sealed fixed subassembly one-to-one set up, sealed subassembly of aerifing and sealed fixed subassembly are configured into the both ends of sealed bellows, and fill the gas of setting pressure into the bellows, on the one hand, bellows 3 inside remains the high pressure state all the time, bellows 3 outside is exposed in the outside atmospheric pressure, bellows 3 internal pressure is greater than self external pressure, can make the bellows stretch out and draw back under the condition of inside and outside differential pressure, simulate real operational environment, improve the test accuracy; on the other hand, the corrugated pipe is stably and hermetically connected through the sealing inflation assembly and the sealing fixing assembly, so that the connection sealing performance of the corrugated pipe is ensured, and the test accuracy is further improved; at least two sets of sealing fixing assemblies and at least two sets of sealing inflating assemblies are arranged, so that the testing of at least two corrugated pipes can be completed at one time conveniently, and the detection efficiency of the device is improved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.

Fig. 1 is an assembly schematic diagram of a bellows life test device in an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a bellows in the prior art;

fig. 3 is an exploded view of a bellows life test device in an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a seal inflation assembly, a bellows and a seal fixing assembly according to an embodiment of the present invention;

FIG. 5 is an enlarged view of a portion of FIG. 4 at A;

FIG. 6 is a partial enlarged view of the portion B in FIG. 4;

fig. 7 is an exploded view of the seal inflation assembly, bellows, and seal retainer assembly in an embodiment of the present invention.

Reference numerals:

1. a support assembly; 2. a movable member; 3. a bellows; 4. an inflation device; 5. a drive device;

11. supporting the carrier plate; 111. a central through hole; 112. a first mounting hole; 12. supporting the guide bar; 13. sealing the inflation assembly; 131. an inflation connecting rod; 132. a first support ring; 1321. a first expansion section; 1322. a first connection portion; 1323. a first regulating through groove;

21. a seal fixing assembly; 211. a fixed connecting rod; 212. a second support ring; 2121. a second expansion section; 2122. a second connecting portion; 2123. a second regulating through groove; 22. a guide hole; 23. and a second mounting hole.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, and are only for convenience of description of the present invention and simplification of description, but do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; either mechanically or electrically. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

Details of the present embodiment are described below with reference to fig. 1 to 7. As shown in fig. 1 and fig. 3, the present embodiment provides a bellows life test apparatus, which includes a support assembly 1 and a movable member 2, the support assembly 1 includes a support carrier 11 and a support guide rod 12, the support guide rod 12 is fixed on the support carrier 11 and extends vertically, and at least two sets of sealing and inflating assemblies 13 are disposed on the support carrier 11. The moving part 2 is movably sleeved on the support guide rod 12 and can reciprocate along the vertical direction relative to the support component 1, at least two sets of sealing and fixing components 21 are arranged on the moving part 2, and the sealing and inflating components 13 correspond to the sealing and fixing components 21 one by one. The seal inflation assembly 13 and the seal fixing assembly 21 are configured to seal both ends of the bellows 3, that is, both ends of the bellows 3 are hermetically connected to the seal inflation assembly 13 and the seal fixing assembly 21, and to fill the bellows 3 with gas of a set pressure, so that the bellows 3 expands and contracts under a condition of a difference between an inside pressure and an outside pressure.

In short, in the bellows life test device provided by the utility model, the movable part 2 is movably sleeved on the support guide rod 12 and can reciprocate along the vertical direction relative to the support component 1, at least two sets of sealing and inflating components 13 are arranged on the support carrier plate 11, at least two sets of sealing and fixing components 21 are arranged on the movable part 2, the sealing and inflating components 13 and the sealing and fixing components 21 are arranged in one-to-one correspondence, the sealing and inflating components 13 and the sealing and fixing components 21 are configured to seal two ends of the bellows 3, and the bellows 3 is filled with gas with set pressure, on one hand, the inside of the bellows 3 is always kept in a high pressure state, the outside of the bellows 3 is exposed in the external atmospheric pressure, the internal pressure of the bellows 3 is greater than the external pressure of the bellows, so that the bellows 3 can stretch under the condition of internal and external pressure difference, a real working environment is simulated, and the test accuracy is improved; on the other hand, the corrugated pipe 3 is stably connected in a sealing way through the sealing inflation assembly 13 and the sealing fixing assembly 21, so that the connection sealing performance of the corrugated pipe 3 is ensured, and the test accuracy is further improved; at least two sets of sealing and fixing assemblies 21 and at least two sets of sealing and inflating assemblies 13 are arranged, so that the test of at least two corrugated pipes 3 can be completed at one time, and the detection efficiency of the device is improved.

Further, as shown in fig. 4 and 5, the seal inflation assembly 13 includes the inflation connecting rod 131 and the first support ring 132, one end of the bellows 3 is sleeved on the first support ring 132, the first support ring 132 includes the first expansion portion 1321 and the first connecting portion 1322 that are communicated, the inner diameter of the first expansion portion 1321 gradually decreases along the direction close to the first connecting portion 1322, the head of the inflation connecting rod 131 is of a circular truncated cone structure and abuts against the inner wall surface of the first expansion portion 1321, the head of the inflation connecting rod 131 is matched with the inner wall surface of the first expansion portion 1321 in shape, the inner diameter of the inner wall surface is smaller than the outer diameter of the circular truncated cone structure, and the expansion first expansion portion 1321 is favorably and rapidly expanded. The rod portion of the air connecting rod 131 is screwed with the first connecting portion 1322, and when the air connecting rod 131 rotates relative to the first connecting portion 1322 to drive the circular truncated cone structure to move axially, the outer diameter of the first expansion portion 1321 can be adjusted to be larger and the corrugated pipe 3 can be expanded. The rod portion of the air inflation connecting rod 131 is provided with an external thread, the first connecting portion 1322 is provided with an internal thread, the air inflation connecting rod 131 is rotated, the head portion of the circular truncated cone structure of the air inflation connecting rod 131 is inserted into the inner wall of the first expansion portion 1321, along with axial movement, the outer diameter of the first expansion portion 1321 is gradually expanded by the circular truncated cone structure, and then expansion connection of the first supporting ring 132 and the corrugated pipe 3 is achieved, and connection sealing performance is improved. The first supporting ring 132 may be made of an elastic material, such as rubber or flexible metal.

Further, as shown in fig. 7, a first adjusting through slot 1323 is opened on a circumferential wall of the first expansion portion 1321, and one end of the first adjusting through slot 1323 extends to an open end of the first expansion portion 1321. The resistance that expands gradually reduces, is favorable to the external diameter of first tight portion 1321 that expands fast to insert the inner wall of first tight portion 1321 that expands when the head of aerifing connecting rod 131 round platform structure, and along with axial displacement, the notch of first regulation logical groove 1323 enlarges.

Further, as shown in fig. 3, the bellows life test device further includes an inflator 4, and the inflation connecting rod 131 is hollow inside and is communicated with the inflator 4. The inflation device 4 can guarantee that the inside of the corrugated pipe 3 is always in a high-pressure state through the inflation connecting rod 131 according to the needs of experiments. One of the inflating device 4 and the inflating connecting rod 131 is provided with a barometer for testing the pressure value inside the corrugated pipe 3.

Further, as shown in fig. 4 and 6, the seal fixing assembly 21 includes a fixing connection bar 211 and a second stay ring 212, and the fixing connection bar 211 is solid. One end of the corrugated tube 3 is sleeved on the second supporting ring 212, the second supporting ring 212 comprises a second expansion portion 2121 and a second connecting portion 2122 which are communicated, an opening of the second expansion portion 2121 is gradually reduced along a direction close to the second connecting portion 2122, a head of the fixed connecting rod 211 is of a circular truncated cone structure and is abutted to an inner wall surface of the second expansion portion 2121, a rod of the fixed connecting rod 211 is in threaded connection with the second connecting portion 2122, so that the outer diameter of the second expansion portion 2121 is adjustable and the corrugated tube 3 is expanded, the head of the fixed connecting rod 211 is matched with the inner wall surface of the second expansion portion 2121 in shape, the inner diameter of the inner wall surface is smaller than the outer diameter of the circular truncated cone structure, and the expansion of the second expansion portion 2121 is facilitated to be rapidly expanded. The rod part of the fixed connecting rod 211 is provided with an external thread, the second connecting part 2122 is provided with an internal thread, the axial movement is realized by rotating the fixed connecting rod 211, the head part of the circular truncated cone structure of the fixed connecting rod 211 is inserted into the inner wall of the second expansion part 2121, along with the axial movement of the fixed connecting rod 211, the outer diameter of the second expansion part 2121 is gradually expanded by the circular truncated cone structure, the expansion connection of the second support ring 212 and the corrugated pipe 3 is realized, and the connection sealing performance is improved. The second support ring 212 may also be made of an elastic material, such as rubber, flexible metal, etc.

Further, as shown in fig. 7, a second adjusting through groove 2123 is opened on a circumferential wall of the second expansion portion 2121, and one end of the second adjusting through groove 2123 extends to an open end of the second expansion portion 2121. The resistance of gradual expansion is reduced, the outer diameter that is favorable to first tight portion 1321 that expands fast inserts the inner wall of second tight portion 2121 that expands when the head of fixed connection pole 211 round platform structure, and along with axial displacement, the notch of second regulation logical groove 2123 enlarges gradually.

Further, as shown in fig. 3, the moving member 2 is a movable plate, the sealing fixing component 21 is detachably connected to the movable plate, the movable plate has a through guide hole 22, the supporting guide rod 12 slidably penetrates through the guide hole 22 and extends out, and the moving member 2 realizes that the moving member 2 always keeps reciprocating motion along the vertical direction due to the guide hole 22 and the supporting guide rod 12.

Further, as shown in fig. 3, the bellows life test device further includes a driving device 5, and an output shaft of the driving device 5 is connected to the movable member 2, and is used for driving the movable member 2 to reciprocate relative to the support assembly 1. The drive means 5 provide continuous power for the movement of the movable element 2.

Further, as shown in fig. 3, the driving device 5 is disposed on one side of the supporting component 1 away from the moving member 2, a central through hole 111 is formed on the supporting carrier plate 11, an output shaft of the driving device 5 penetrates through the central through hole 111 and extends out, and the extending end of the output shaft is connected to the moving member 2. The driving device 5 is arranged on one side of the supporting component 1 far away from the moving part 2, so that the occupied space of the driving device 5 is reduced, and the compactness of the whole structure is facilitated. The extending tail end of the output shaft is locked with the moving piece 2 through a nut, and the bellows 3 is compressed or stretched under the driving of the output shaft of the driving device 5 by the moving piece 2, so that the mechanical life test is completed.

In a conventional experimental device, a speed-time curve in a motion process of the corrugated pipe 3 is a sine wave, but actually, a vacuum switch drives a movable conducting rod of a vacuum arc extinguish chamber to drive a closing and opening speed-time curve of the corrugated pipe 3 to compress and stretch, the closing and opening speed-time curve is not the same, the driving device 5 in the embodiment is a direct current linear motor, the stretching motion speed of the corrugated pipe 3 is consistent with the actual closing and opening curve of an actual vacuum switch by controlling the current of the direct current linear motor, the actual working condition of the corrugated pipe 3 is further simulated, and the accuracy of service life test data of the corrugated pipe 3 is improved.

Further, as shown in fig. 1 and fig. 3, at least two first mounting holes 112 are formed through the support carrier 11, and the at least two first mounting holes 112 are spaced apart from each other by taking the central through hole 111 as a center. The moving part 2 has at least two second mounting holes 23 formed therethrough, and the first mounting holes 112 correspond to the second mounting holes 23 one to one. Specifically, the first mounting hole 112 is used for mounting the seal inflation assembly 13, and the second mounting hole 23 is used for mounting the seal fixing assembly 21, so that the bellows 3 can be correctly mounted in later experiments. The at least two first mounting holes 112 are spaced apart from each other by centering the central through hole 111, and when the at least two corrugated pipes 3 are mounted, they are uniformly distributed, and the balance stability of the testing apparatus is maintained.

In other embodiments, a shock absorbing layer is disposed at the connection between the support guide rod 12 and the support carrier 11 to reduce the transmission of vibration and ensure the stable connection of the corrugated tube 3.

When the corrugated pipe 3 is clamped on the corrugated pipe service life testing device, the two ends adopt a sealing clamping mode, the upper port and the lower port are internally provided with silicon rubber sealing rings, the sealing rings at the two ends are matched with the first supporting ring 132 and the second supporting ring 212, when the connecting rod 131 and the fixed connecting rod 211 are inflated in a rotating mode, the conical surface of the supporting ring is gradually propped open, the silicon rubber sealing rings are tightly pressed between the inner wall of the port of the corrugated pipe 3 and the supporting rings, the reliable clamping of the port of the corrugated pipe 3 is guaranteed, and the sealing of the port is realized. The gas-filled connecting rod 131 and the fixed connecting rod 211 are fixed on the support carrier plate 11 and the movable member 2 by nuts.

It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious modifications, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.

Claims (10)

1. A bellows life test device, its characterized in that includes:

the supporting assembly (1) comprises a supporting carrier plate (11) and supporting guide rods (12), wherein the supporting guide rods (12) are fixed on the supporting carrier plate (11) and vertically extend out, and at least two sets of sealing and inflating assemblies (13) are arranged on the supporting carrier plate (11);

the movable piece (2) is movably sleeved on the support guide rod (12) and can reciprocate relative to the support assembly (1) along the vertical direction, at least two sets of sealing and fixing assemblies (21) are arranged on the movable piece (2), and the sealing and inflating assemblies (13) are arranged in one-to-one correspondence with the sealing and fixing assemblies (21);

the seal inflation assembly (13) and the seal fixing assembly (21) are configured to seal both ends of a bellows (3), and gas of a set pressure is charged into the bellows (3).

2. The bellows life test device according to claim 1, wherein the seal inflation assembly (13) includes an inflation connecting rod (131) and a first support ring (132), one end of the bellows (3) is sleeved on the first support ring (132), the first support ring (132) includes a first expansion portion (1321) and a first connecting portion (1322) that are communicated, an inner diameter of the first expansion portion (1321) gradually decreases in a direction approaching the first connecting portion (1322), a head portion of the inflation connecting rod (131) is of a circular truncated cone structure and abuts against an inner wall surface of the first expansion portion (1321), and a rod portion of the inflation connecting rod (131) is screwed with the first connecting portion (1322) so that an outer diameter of the first expansion portion (1321) is adjustable and the bellows (3) is expanded.

3. The corrugated pipe service life testing device according to claim 2, wherein a first adjusting through groove (1323) is opened on a circumferential wall of the first expansion portion (1321), and one end of the first adjusting through groove (1323) extends to an opening end of the first expansion portion (1321).

4. The bellows life test device according to claim 3, further comprising an inflation apparatus (4), wherein the inflation connecting rod (131) is hollow inside and is communicated with the inflation apparatus (4).

5. The bellows life test device according to claim 1, wherein the seal fixing assembly (21) includes a fixing connection rod (211) and a second support ring (212), one end of the bellows (3) is sleeved on the second support ring (212), the second support ring (212) includes a second expansion portion (2121) and a second connection portion (2122) which are communicated with each other, an opening of the second expansion portion (2121) is gradually reduced along a direction close to the second connection portion (2122), a head portion of the fixing connection rod (211) is of a circular truncated cone structure and abuts against an inner wall surface of the second expansion portion (2121), and a rod portion of the fixing connection rod (211) is in threaded connection with the second connection portion (2122) so that an outer diameter of the second expansion portion (2121) is adjustable and the bellows (3) is expanded.

6. The bellows life test device according to claim 5, wherein a second adjusting through groove (2123) is formed in a circumferential wall of the second expansion portion (2121), and one end of the second adjusting through groove (2123) extends to an opening end of the second expansion portion (2121).

7. The corrugated pipe service life testing device according to claim 1, wherein the movable member (2) is a movable plate, the sealing and fixing assembly (21) is detachably connected to the movable plate, a guide hole (22) is formed through the movable plate, and the supporting guide rod (12) is slidably inserted through the guide hole (22) and extends out.

8. The corrugated pipe service life testing device according to any one of claims 1 to 7, further comprising a driving device (5), wherein an output shaft of the driving device (5) is connected with the movable member (2) and is used for driving the movable member (2) to reciprocate relative to the support assembly (1).

9. The bellows life test device according to claim 8, wherein the driving device (5) is disposed on a side of the support assembly (1) away from the movable member (2), a central through hole (111) is formed in the support carrier (11), the output shaft penetrates through the central through hole (111) and extends out, and an extended end of the output shaft is connected to the movable member (2).

10. The corrugated pipe service life testing device according to claim 9, wherein at least two first mounting holes (112) are formed through the support carrier (11), and the at least two first mounting holes (112) are arranged at intervals with the central through hole (111) as a center.

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