Fatigue strength testing device

Abstract

The utility model provides a fatigue strength test device, which comprises a working condition simulation cabin, a first moving mechanism and a second moving mechanism, the working condition simulation cabin is internally provided with a first accommodating space capable of accommodating a corrugated pipe, and the first accommodating space is respectively communicated with a heating medium system and a refrigerant system to form a high-temperature environment or a low-temperature environment; the first moving mechanism is arranged on the top side of the working condition simulation cabin and comprises a first moving part, at least part of the first moving part can be arranged in the first containing space to be connected with one end of the corrugated pipe, and the first moving part can reciprocate in the longitudinal direction relative to the working condition simulation cabin; the second moving mechanism is arranged on the bottom side of the working condition simulation cabin and comprises a second moving part, at least part of the second moving part can be arranged in the first containing space to be connected with the other end of the corrugated pipe, the second moving part can reciprocate in the first direction relative to the working condition simulation cabin, and a gas channel is formed in the second moving part; the gas channel communicates with the gas pressure source and a pipeline of the corrugated pipe to form a high-pressure environment in the pipeline.

Description

Technical Field

[0001] This application relates to the technical field of bellows fatigue strength testing, and particularly to a fatigue strength testing device. Background Art

[0002] At present, the actual working conditions of some bellows applied to special occasions are complex and changeable. The expansion joints of bellows usually need to operate under one or more working conditions such as high temperature, low temperature, high pressure, high-frequency tension, and high-frequency vibration. Therefore, the selection of technical parameters of bellows products and the magnitude judgment of the service life of bellows are particularly important. After the bellows industry produces bellows products, it is necessary to test the fatigue strength of bellows under various working conditions, so as to evaluate the use parameters and service life of the bellows products.

[0003] However, most of the current equipment for bellows fatigue strength testing can usually only simulate a single working condition environment, and usually only has the ability to unidirectionally stretch the expansion joints of bellows, and cannot effectively simulate the actual use conditions of the expansion joints under complex working conditions, seriously affecting the accuracy of test results. Therefore, how to realize the fatigue strength test of the expansion joints of bellows under complex working conditions is a technical problem that needs to be solved urgently at present. Summary of the Utility Model

[0004] The purpose of the embodiments of this application is to provide a fatigue strength testing device to realize the fatigue strength test of the expansion joints of bellows within a wide temperature range of high and low temperatures under complex working conditions.

[0005] To solve the above technical problems, the embodiments of this application provide the following technical solutions:

[0006] In the first aspect of this application, a fatigue strength testing device is provided, which is applied to the fatigue strength test of the expansion joints in bellows. The fatigue strength testing device includes: a working condition simulation chamber, which has a first accommodating space inside and can be used to accommodate the bellows. The first accommodating space is respectively connected to a heat medium system and a refrigerant system, so as to form a high-temperature environment or a low-temperature environment inside the first accommodating space; a first moving mechanism, arranged on the top side of the working condition simulation chamber, which includes: a first moving member, the first moving member can be at least partially placed inside the first accommodating space and is used to connect with one end of the bellows, and the first moving member can reciprocate longitudinally relative to the working condition simulation chamber; a second moving mechanism, arranged on the bottom side of the working condition simulation chamber, which includes: a second moving member, the second moving member can be at least partially placed inside the first accommodating space and is used to connect with the other end of the bellows, and the second moving member can reciprocate in a first direction relative to the working condition simulation chamber. A gas channel is arranged inside the second moving member, and the gas channel is used to connect a pneumatic source and the pipeline of the bellows, so as to form a high-pressure environment inside the pipeline; wherein, the first direction is perpendicular to the longitudinal direction.

[0007] In some modified embodiments of the first aspect of the present application, the heat medium system includes a heating component disposed on the inner wall of the first accommodation space; and / or the refrigerant system includes a refrigerant inlet opened on one side of the working condition simulation chamber and communicating with the first accommodation space, and the refrigerant inlet is used to communicate with a refrigerant medium source.

[0008] In some modified embodiments of the first aspect of the present application, the fatigue strength test device further includes: a device main body having a second accommodation space inside, which can be used to accommodate at least part of the working condition simulation chamber, a first moving mechanism disposed on the top side of the device main body, and a second moving mechanism disposed on the bottom side of the device main body.

[0009] In some modified embodiments of the first aspect of the present application, the first moving mechanism further includes: a first telescopic component disposed on the top of the device main body, the first telescopic component includes a first telescopic member, at least part of the first telescopic member is built inside the second accommodation space and can reciprocally telescopically move longitudinally relative to the device main body, and a first moving member is connected to the first telescopic member.

[0010] In some modified embodiments of the first aspect of the present application, the first moving mechanism further includes: at least one group of first guiding components, each group of first guiding components includes: a first guide rail and at least one first slider, each first guide rail is disposed on the inner wall of the second accommodation space and extends longitudinally, the first slider is slidably connected to its corresponding first guide rail, and the first moving member is connected to the first slider.

[0011] In some modified embodiments of the first aspect of the present application, the second moving mechanism further includes: a second telescopic component disposed on the bottom side of the second accommodation space, the second telescopic component includes a second telescopic member, the second telescopic member can reciprocally telescopically move in a first direction relative to the device main body, and a second moving member is connected to the second telescopic member.

[0012] In some modified embodiments of the first aspect of the present application, the second moving mechanism further includes: at least one group of second guiding components, each group of second guiding components includes: a second guide rail and at least one second slider, each second guide rail is disposed on the bottom of the second accommodation space and extends in the first direction, the second slider is slidably connected to its corresponding second guide rail, and the second moving member is connected to the second slider.

[0013] In some modified embodiments of the first aspect of the present application, the fatigue strength test device further includes: a third moving mechanism, there is an opening on one side of the device main body communicating with the second accommodation space, the third moving mechanism is disposed on the side of the device main body close to the opening and at least part of it is built inside the second accommodation space through the opening; wherein, the third moving mechanism includes a third moving member, the third moving member can reciprocally move between the inside and outside of the second accommodation space through the opening, and the working condition simulation chamber is disposed on the third moving member.

[0014] In some modified embodiments of the first aspect of the present application, a hatch is provided on one side of the working condition simulation chamber facing the device main body, and an observation window is provided on the hatch.

[0015] In some modified embodiments of the first aspect of the present application, an explosion-proof window is provided on the side of the device main body opposite to the opening.

[0016] Compared with the prior art, the fatigue strength test device can simulate the vibration or swinging working conditions of the bellows to be tested through the individual action or combined action of the first moving member and the second moving member, simulate the high and low temperature working conditions of the bellows to be tested through the heat medium system and the refrigerant system communicated with the first accommodating space of the working condition simulation chamber, and input gas into the internal pipeline of the bellows to be tested through a gas source device externally connected to the gas passage inside the second moving member to simulate the working condition air pressure of the internal pipeline of the bellows to be tested. The fatigue strength test device provided by the present application can realize the fatigue strength test of the expansion joint in the bellows to be tested within a wide temperature range of high and low temperatures under complex working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] By reading the following detailed description with reference to the accompanying drawings, the above and other objects, features and advantages of the exemplary embodiments of the present application will become readily understood. In the drawings, several embodiments of the present application are shown in an exemplary rather than restrictive manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0018] Figure 1 Schematically shows a structural diagram of the fatigue strength test device proposed in the embodiment of the present application in an untested state;

[0019] Figure 2 Schematically shows a structural diagram of the fatigue strength test device proposed in the embodiment of the present application at an angle in a tested state;

[0020] Figure 3 Schematically shows a structural diagram of the fatigue strength test device proposed in the embodiment of the present application at another angle in a tested state;

[0021] Figure 4 Schematically shows an assembly structural diagram between the device main body and the first moving mechanism and the second moving mechanism in the fatigue strength test device proposed in the embodiment of the present application;

[0022] Figure 5 Schematically shows a structural diagram of the working condition simulation chamber in the fatigue strength test device proposed in the embodiment of the present application;

[0023] Figure 6 Schematically shows an assembly structural diagram between the working condition simulation chamber and the third moving mechanism in the fatigue strength test device proposed in the embodiment of the present application.

[0024] Explanation of the reference numerals in the drawings:

[0025] 1. Working condition simulation chamber; 101. First accommodating space; 102. Refrigerant inlet; 103. Chamber door; 103a. Observation window; 104. Avoidance groove; 105. Connecting block; 2. First moving member; 3. Second moving member; 301. Gas passage; 4. Heating component; 5. Device main body; 501. Second accommodating space; 502. Explosion-proof window; 6. First hydraulic cylinder; 7. First guide rail; 8. First slider; 9. Second hydraulic cylinder; 10. Second guide rail; 11. Second slider; 12. Third guide rail; 13. Third slider; 14. Bellows; 15. Operating platform; 1501. Gas source tank; 16. Liquid nitrogen machine; X. First direction. Specific embodiments

[0026] Hereinafter, the exemplary embodiments of the present disclosure will be described in more detail with reference to the drawings. Although the exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present disclosure can be more thoroughly understood and the scope of the present disclosure can be completely conveyed to those skilled in the art.

[0027] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the ordinary meanings understood by those skilled in the art to which this application belongs.

[0028] Embodiment

[0029] Refer to the attached Figure 1 to the attached Figure 5, an embodiment of the present utility model provides a fatigue strength test device, which is applied to the fatigue strength test of expansion joints in a bellows 14. The fatigue strength test device includes: a working condition simulation chamber 1, a first moving mechanism, and a second moving mechanism. The inside of the working condition simulation chamber has a first accommodation space 101 that can be used to accommodate the bellows 14. The first accommodation space 101 is respectively connected to a heat medium system and a refrigerant system to form a high-temperature environment or a low-temperature environment in the first accommodation space 101. The first moving mechanism is arranged on the top side of the working condition simulation chamber 1, and it includes a first moving member 2. The first moving member 2 can be at least partially placed inside the first accommodation space 101 for connecting with one end of the bellows 14, and the first moving member 2 can reciprocate longitudinally relative to the working condition simulation chamber 1. The second moving mechanism is arranged on the bottom side of the working condition simulation chamber 1, and it includes a second moving member 3. The second moving member 3 can be at least partially placed inside the first accommodation space 101 for connecting with the other end of the bellows 14, and the second moving member 3 can reciprocate along the first direction X relative to the working condition simulation chamber 1. A gas passage 301 is arranged inside the second moving member 3, and the gas passage 301 is used to connect a pneumatic source and the pipeline of the bellows 14 to form a high-pressure environment inside the pipeline. Wherein, the first direction X is perpendicular to the longitudinal direction.

[0030] Specifically, the fatigue strength test device includes: a working condition simulation chamber 1, a first moving mechanism, and a second moving mechanism. Among them, the first moving mechanism and the second moving mechanism can be a cylinder, a hydraulic cylinder, or a linear moving mechanism driven by a driving motor. The first moving mechanism and the second moving mechanism respectively include a first moving member 2 and a second moving member 3. The first moving member 2 and the second moving member 3 can be respectively threadedly connected to two ends in the extending direction of the bellows 14 to be tested through threaded connectors, so as to realize the disassembly and assembly of the fatigue strength test device for the bellows 14 to be tested. A gas passage 301 for flowing fluid gas is provided inside the second moving member 3. Two ends of the gas passage 301 are respectively used to communicate with the internal pipeline of the bellows 14 to be tested and an external gas source device. The external gas source device can be a gas source tank 1501 connected to the main gas source pipeline, a gas pump, or an air compressor in the test workshop. In some preferred implementation schemes of the fatigue strength test device proposed in the embodiments of the present invention, the gas passage 301 is connected to the gas source tank 1501. An independent operation console 15 can be provided outside the fatigue strength test device. The gas source tank 1501 can be built inside the operation console 15 and connected to the main gas source pipeline or the air compressor in the workshop, so as to ensure that the gas source tank 1501 can input gas into the internal pipeline of the bellows 14 to be tested through the gas passage 301 to simulate the working condition air pressure of the internal pipeline of the bellows 14 to be tested. The working condition simulation chamber 1 can be a box structure formed by welding plates, and it has a first accommodation space 101 inside. Avoidance grooves 104 matching the first moving member 2 or the second moving member 3 can be provided at the top and bottom of the working condition simulation chamber 1, so that the first moving member 2 and the second moving member 3 can be partially built into the first accommodation space 101 of the working condition simulation box through the avoidance grooves 104, and the structural strength of the avoidance groove 104 can be strengthened by providing connection blocks 105 at the avoidance grooves 104. The bellows 14 to be tested can be built into the second accommodation space 501 of the working condition simulation box during the test. The bellows 14 to be tested can realize independent movement along the first direction X, longitudinal movement, and simple harmonic movement with a sine wave or triangular wave waveform in the second accommodation space 501 under the separate action or combined action of the first moving member 2 and the second moving member 3, and the vibration or swinging working condition of the bellows 14 to be tested can be simulated through the separate action or combined action of the first moving member 2 and the second moving member 3. The first accommodation space 101 of the working condition simulation chamber 1 can be respectively communicated with a heat medium system and a refrigerant system, and a heat medium medium and a refrigerant medium can be respectively provided into the first accommodation space 101 through the heat medium system and the refrigerant system, so as to realize the simulation of high and low temperature working conditions inside the first accommodation space 101.

[0031] According to the above, the fatigue strength test device can simulate the vibration or swinging conditions of the bellows 14 to be tested through the individual or combined actions of the first moving member 2 and the second moving member 3. The high and low temperature conditions of the bellows 14 to be tested are simulated through a heat medium system and a refrigerant system that communicate with the first accommodation space 101 of the working condition simulation chamber 1. Gas is input into the internal pipeline of the bellows 14 to be tested through a gas source tank 1501 externally connected to the gas passage 301 inside the second moving member 3 to simulate the working condition air pressure of the internal pipeline of the bellows 14 to be tested. When performing a fatigue strength test on the bellows 14 to be tested using this fatigue strength test device, a fatigue strength test of one or more vibration or swinging conditions within a wide temperature range of high and low temperatures under a pressurized condition for the bellows 14 to be tested can be achieved through the above functions.

[0032] In some embodiments of the fatigue strength test device proposed in the embodiments of the present application, referring to Att Figure 1 to Att Figure 3 and Att Figure 5 , in specific implementation, the heat medium system includes a heating component 4, and the heating component 4 is arranged on the inner wall of the first accommodation space 101; and / or the refrigerant system includes a refrigerant input port 102, the refrigerant input port 102 is opened on one side of the working condition simulation chamber 1 and communicates with the first accommodation space 101, and the refrigerant input port 102 is used to communicate with a refrigerant medium source.

[0033] Specifically, in order to enable the working condition simulation chamber 1 to simulate the working condition environment of the bellows 14 to be tested in a high and low temperature environment, in the technical solution adopted in the embodiments of the present utility model, the first accommodation space 101 of the working condition simulation chamber 1 communicates with the heat medium system and the refrigerant system respectively. In some preferred implementation schemes of the fatigue strength test device proposed in the embodiments of the present utility model, the heat medium system is a heating component 4 composed of a plurality of heating resistance elements, more specifically, heating resistance wires, and the heating resistance wires can be arranged on the inner wall of the second accommodation space 501 so that the second accommodation space 501 can generate a high temperature environment; a refrigerant input port 102 communicating with the second accommodation space 501 inside is opened on one side of the working condition simulation chamber 1, and the refrigerant input port 102 can be connected to a liquid nitrogen machine 16 that can provide liquid nitrogen through connecting pipe fittings such as joints, and the liquid nitrogen machine 16 can input liquid nitrogen into the second accommodation space 501 through the refrigerant input port 102 so that the second accommodation space 501 can generate a low temperature environment. In some preferred implementation schemes of the fatigue strength test device proposed in the embodiments of the present utility model, the second accommodation space 501 of the working condition simulation chamber 1 can simulate a high and low temperature working condition environment in a wide temperature range from -190°C to 800°C through heating resistance wires and liquid nitrogen to meet the fatigue strength test requirements of the bellows 14 to be tested.

[0034] In some embodiments of the fatigue strength test device proposed in the embodiments of the present application, referring to Attached Figure 1 to Attached Figure 4 , in a specific implementation, the fatigue strength test device further includes: a device main body 5, which has a second accommodation space 501 inside, and can be used to accommodate at least part of the working condition simulation chamber 1. A first moving mechanism is arranged on the top side of the device main body 5, and a second moving mechanism is arranged on the bottom side of the device main body 5.

[0035] Specifically, in order to reduce the stability when the first moving member 2 and the second moving member 3 move and improve the accuracy of the test results of the fatigue strength test of the bellows 14, in the technical solution adopted in the embodiments of the present invention, the fatigue strength test device should also have a device main body 5 that can strengthen the structural strength of the entire device. The device main body 5 can adopt a structural form welded by pipes and plates or a structural form of threaded splicing of profiles and plates. In some preferred embodiments of the fatigue strength test device proposed in the embodiments of the present invention, the device main body 5 adopts a structural form welded by steel pipes and steel plates. The device main body 5 is in a cuboid frame structure so that it has a second accommodation space 501 that can be used for the fatigue strength test of the bellows 14 to be tested. The second accommodation space 501 can accommodate at least part of the working condition simulation chamber 1 to ensure that the working condition simulation chamber 1 can perform high and low temperature environment working condition simulation operations on the bellows 14 to be tested connected in the second accommodation space 501. The first moving mechanism is arranged on the top side of the second accommodation space 501 and the first moving member 2 is located inside the second accommodation space 501. The second moving mechanism is arranged at the bottom of the second accommodation space 501 and the second moving member 3 is located inside the second accommodation space 501. The first moving member 2 and the second moving member 3 can be respectively connected to two ends in the extending direction of the bellows 14 to be tested. When performing a fatigue strength test on the bellows 14 to be tested, the reciprocating movement of the first moving member 2 and the second moving member 3 can simulate the working conditions of the expansion joint in the bellows 14 to be tested being stretched, compressed or vibrated. The first moving mechanism and the second moving mechanism are connected and fixed to the device main body 5, and the vibration generated when the first moving member 2 and the second moving member 3 move can be reduced by the self-weight of the device main body 5, and the accuracy of the test structure can be effectively improved.

[0036] In some embodiments of the fatigue strength test device proposed in the embodiments of the present application, referring to Attached Figure 1 to Attached Figure 4 , in a specific implementation, the first moving mechanism further includes: a first telescopic component, arranged on the top of the device main body 5. The first telescopic component includes a first telescopic member. At least part of the first telescopic member is built inside the second accommodation space 501 and can reciprocally telescopically move longitudinally relative to the device main body 5. The first moving member 2 is connected to the first telescopic member.

[0037] Specifically, in order to enable the first moving member 2 to reciprocate relative to the working condition simulation chamber 1 in the longitudinal direction, in the technical solution adopted in the embodiment of the present invention, the first moving mechanism is disposed on the top side of the second accommodation space 501 of the device main body 5. The first moving mechanism can be a cylinder, a hydraulic cylinder or a linear moving mechanism driven by a motor. In some preferred implementation manners of the fatigue strength test device proposed in the embodiment of the present invention, the first moving mechanism is a linear moving mechanism driven by a hydraulic cylinder to ensure that it has sufficient and stable driving force to maintain the shape change of the expansion joint in the bellows 14 to be tested. The first moving mechanism includes a first hydraulic cylinder 6. The cylinder body of the first hydraulic cylinder 6 is disposed on the top of the device main body 5 and is located outside the second accommodation space 501. The push rod of the first hydraulic cylinder 6 is disposed in a state parallel to the longitudinal direction and is located inside the second accommodation space 501. The push rod of the first hydraulic cylinder 6 can be connected to the first moving member 2 through a connecting member such as a hinge or a floating joint to ensure that the first moving member 2 can reciprocate relative to the working condition simulation chamber 1 in the longitudinal direction inside the second accommodation space 501 under the action of the first hydraulic cylinder 6, and the vibration generated during the movement of the first moving member 2 can be reduced under the connection action of the hinge or the floating joint, thereby ensuring the accuracy of the test result of the fatigue strength of the bellows 14.

[0038] In some implementation manners of the fatigue strength test device proposed in the embodiment of the present application, referring to the attached Figure 1 to the attached Figure 4 , in a specific implementation, the first moving mechanism further includes: at least one group of first guiding components. Each group of first guiding components includes: a first guide rail 7 and at least one first slider 8. Each first guide rail 7 is disposed on the inner wall of the second accommodation space 501 and extends in the longitudinal direction. The first slider 8 is slidably connected to its corresponding first guide rail 7. The first moving member 2 is connected to the first slider 8.

[0039] Specifically, in order to enable the first moving member 2 to reciprocate longitudinally relative to the working condition simulation chamber 1, in the technical solution adopted in the embodiment of the present invention, at least one set of first guiding components is provided on the inner wall of the second accommodating space 501 of the device main body 5. In some preferred implementation schemes of the fatigue strength test device proposed in the embodiment of the present invention, the first moving mechanism includes two sets of first guiding components, and the two sets of first guiding components are respectively arranged on two opposite inner walls of the second accommodating space 501. Each set of first guiding components includes two first guide rails 7 extending in the same direction. A first slider 8 is slidably connected to each first guide rail 7. The first guide rails 7 in each set of first guiding components extend longitudinally on the inner wall of the second accommodating space 501 where they are located. The side portion of the first moving member 2 is connected to the first sliders 8 on each first guide rail 7. When the first moving member 2 reciprocates longitudinally under the drive of the first hydraulic cylinder 6, the first guiding components can play a guiding role, making the moving trajectory of the first moving member 2 smoother, thereby reducing the violent vibration generated during the movement of the first moving member 2 and effectively improving the accuracy of the test structure.

[0040] In some implementation manners of the fatigue strength test device proposed in the embodiment of the present application, referring to Attached Figure 1 to Attached Figure 4 , in specific implementation, the second moving mechanism further includes: a second telescopic member, arranged at the bottom side of the second accommodating space 501. The second telescopic member includes a second telescopic member, and the second telescopic member can reciprocally telescope relative to the device main body 5 along the first direction X. The second moving member 3 is connected to the second telescopic member.

[0041] Specifically, in order to enable the second moving member 3 to reciprocate relative to the working condition simulation chamber 1 along the first direction X, in the technical solution adopted in the embodiment of the present invention, the second moving mechanism is arranged at the bottom of the second accommodating space 501 of the device main body 5. The second moving mechanism can be a linear moving mechanism driven by a cylinder, a hydraulic cylinder or a motor. In some preferred implementation schemes of the fatigue strength test device proposed in the embodiment of the present invention, the second moving mechanism is a linear moving mechanism driven by a hydraulic cylinder to ensure that it has sufficient and stable driving force to maintain the shape change of the expansion joint in the corrugated pipe 14 to be tested. This second moving mechanism includes a second hydraulic cylinder 9. The cylinder body of the second hydraulic cylinder 9 is arranged at the bottom of the second accommodating space 501 of the device main body 5. The push rod of the second hydraulic cylinder 9 is arranged in a state parallel to the first direction X, and the push rod of the second hydraulic cylinder 9 can be connected to the second moving member 3 through a connecting member such as a hinge or a floating joint, so as to ensure that the second moving member 3 can reciprocate relative to the working condition simulation chamber 1 along the first direction X under the action of the second hydraulic cylinder 9, and the vibration generated during the movement of the second moving member 3 can be reduced under the connection action of the hinge or the floating joint, thereby ensuring the accuracy of the result of the fatigue strength test of the corrugated pipe 14.

[0042] In some embodiments of the fatigue strength test device proposed in the embodiments of the present application, referring to the appended Figure 1 to the appended Figure 4 , in a specific implementation, the second moving mechanism further includes: at least one set of second guiding components, each set of second guiding components including: a second guide rail 10 and at least one second slider 11. Each second guide rail 10 is disposed at the bottom of the second accommodating space 501 and extends along the first direction X. The second slider 11 is slidably connected to its corresponding second guide rail 10, and the second moving member 3 is connected to the second slider 11.

[0043] Specifically, in order to enable the second moving member 3 to reciprocally move relative to the working condition simulation chamber 1 along the first direction X, in the technical solution adopted in the embodiments of the present utility model, at least one set of second guiding components is disposed at the bottom of the second accommodating space 501 of the device main body 5. In some preferred embodiments of the fatigue strength test device proposed in the embodiments of the present utility model, two sets of second guiding components are spaced apart and installed at the bottom of the second accommodating space 501. Each set of second guiding components includes a second guide rail 10 and two second sliders 11 slidably connected to the second guide rail 10. The two second guide rails 10 extend along the first direction X and are spaced apart. The bottom of the second moving member 3 is respectively connected to the second sliders 11 slidably connected to the two second guide rails 10. When the second moving member 3 reciprocally moves along the first direction X under the drive of the second hydraulic cylinder 9, the second guiding components can play a guiding role, making the moving trajectory of the second moving member 3 smoother, thereby reducing the violent vibration generated during the movement of the second moving member 3 and effectively improving the accuracy of the test structure.

[0044] In some embodiments of the fatigue strength test device proposed in the embodiments of the present application, referring to the appended Figure 1 and the appended Figure 2 and the appended Figure 6 , in a specific implementation, the fatigue strength test device further includes: a third moving mechanism. One side of the device main body 5 has an opening communicating with the second accommodating space 501. The third moving mechanism is disposed on the side of the device main body 5 close to the opening and at least partially extends into the second accommodating space 501 through the opening; wherein, the third moving mechanism includes a third moving member, and the third moving member can reciprocally move between the inside and outside of the second accommodating space 501 through the opening, and the working condition simulation chamber 1 is disposed on the third moving member.

[0045] Specifically, in order to enable the handling to freely enter and exit the device main body 5 for testing the bellows 14 to be tested, in the technical solution adopted in the embodiment of the present utility model, an opening communicating with the second accommodating space 501 inside the device main body 5 is reserved on one side of the device main body 5. The opening is a frame structure composed of closed profiles on the device main body 5. A third moving mechanism is arranged outside the device main body 5. In some preferred implementation schemes of the fatigue strength test device proposed in the embodiment of the present utility model, the third moving mechanism mainly includes a base and a linear moving mechanism. The base can be a frame structure welded by steel pipes or a frame structure spliced by profiles. A rolling and anchor bolt assembly can be arranged at the bottom of the base to realize the movement and positioning of the base. The base extends along the first direction X and partially extends into the second accommodating space 501 of the device main body 5. Two third guide rails 12 are arranged on the base at intervals. The two third guide rails 12 respectively extend along the first direction X into the second accommodating space 501. Two third sliders 13 are correspondingly slidably connected to each third guide rail 12. The bottom of the working condition simulation chamber 1 is respectively connected to the third sliders 13 on the two third guide rails 12. The working condition simulation chamber 1 can be manually moved into or out of the second accommodating space 501 of the device main body 5 along the first direction X through the third moving mechanism. A driving component can also be arranged on the third moving mechanism. The driving component can adopt a ball screw driven by a servo motor or a stepping motor and extending in the same direction as the third guide rail 12 to realize the automatic movement of the working condition simulation chamber 1.

[0046] In some implementation manners of the fatigue strength test device proposed in the embodiment of the present application, referring to the attached Figure 3 and the attached Figure 5 , in the specific implementation, a cabin door 103 is arranged on the side of the working condition simulation chamber 1 facing the device main body 5, and an observation window 103a is arranged on the cabin door 103.

[0047] Specifically, in order to enable the working condition simulation chamber 1 to have a good heat preservation effect during the working condition simulation test and facilitate the operators to observe the test workpieces in the working condition simulation chamber 1 in real time during the test, in the technical solution adopted in the embodiment of the present utility model, an opening for loading and unloading the bellows 14 is arranged on one side of the working condition simulation chamber 1. The side of the opening can be hinged with a cabin door 103 through structures such as hinges or hinges. A sealing strip or a gasket can be arranged between the opening and closing gaps of the cabin door 103 and the opening to improve the heat preservation performance of the working condition simulation chamber 1 when the cabin door 103 is closed. An observation window 103a made of a transparent material is arranged on the cabin door 103. The observation window 103a can be a polygon, a circle or an oval structure. The shape of the observation window 103a that can completely observe the test process of the bellows 14 in the first accommodating space 101 of the working condition simulation chamber 1 is the optimal choice. In order to improve the strength of the observation window 103a, the observation window 103a can be made of explosion-proof glass material.

[0048] In some embodiments of the fatigue strength test device proposed in the embodiments of the present application, referring to the attached Figure 1 to the attached Figure 4 , in a specific implementation, an explosion-proof window 502 is provided on one side of the device main body 5 opposite to the opening.

[0049] Specifically, in order to protect the operators, in the technical solution adopted in the embodiments of the present utility model, an explosion-proof window 502 is provided on one side of the device main body 5 opposite to the opening. The explosion-proof window 502 can adopt a structural form of splicing a frame with aluminum profiles and a transparent material plate and be bolt-connected to structures such as support beams and cross beams in the device main body 5. The explosion-proof window 502 can also adopt a structural form of screwing a frame with steel profiles and a transparent material plate and be welded and fixed to structures such as support beams and cross beams in the device main body 5. In some preferred implementation schemes of the fatigue strength test device proposed in the embodiments of the present utility model, the explosion-proof window 502 adopts a structural manner of splicing a frame with aluminum profiles and explosion-proof glass, so that the operators can not only observe and monitor the test workpiece in the working condition simulation chamber 1 in real time through the explosion-proof window 502 and the observation window 103a, but also be protected by the explosion-proof window 502 to avoid being injured in case of an accident during the test.

[0050] It should be noted that in the description of this specification, the orientation or positional relationship indicated by terms such as "upper" and "lower" is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation to the present utility model; terms such as "connection", "installation", and "fixation" should all be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0051] In the description of this specification, the description of terms such as "one embodiment", "some embodiments", and "specific embodiments" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0052] The above are only the specific embodiments of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model can easily think of changes or substitutions, which should all be covered within the protection scope of the present utility model. Therefore, the protection scope of the present utility model shall be subject to the protection scope of the claimed rights.

Claims

1. A fatigue strength test device, used for fatigue strength test of expansion joints in bellows, characterized in that: include: A working condition simulation cabin, having a first accommodation space therein for accommodating the bellows, wherein the first accommodation space is respectively connected to a heat medium system and a cold medium system, so that a high temperature environment or a low temperature environment is formed in the first accommodation space; A first moving mechanism is arranged on the top side of the working condition simulation cabin, and comprises: a first moving member, which can be at least partially built into the first accommodating space and is used to connect with one end of the bellows, and the first moving member can reciprocate longitudinally relative to the working condition simulation cabin; The second moving mechanism is arranged at the bottom side of the working condition simulation cabin, and comprises: a second moving member, which can be at least partially built into the first accommodating space and is used to connect with the other end of the bellows, and the second moving member can reciprocate along the first direction relative to the working condition simulation cabin, and a gas channel is arranged inside the second moving member, and the gas channel is used to connect the gas pressure source and the pipeline of the bellows, so that a high-pressure environment is formed inside the pipeline; The first direction is perpendicular to the longitudinal direction.

2. The fatigue strength testing device according to claim 1, characterized in that: The heat medium system comprises a heating component, and the heating component is arranged on the inner wall of the first accommodating space; and / or The refrigerant system includes a refrigerant input port, which is opened at one side of the working condition simulation cabin and communicated with the first accommodating space, and the refrigerant input port is used to communicate with a refrigerant medium source.

3. The fatigue strength testing device according to claim 2, characterized in that: Also includes: The device body has a second accommodating space inside, which can be used to accommodate at least part of the working condition simulation cabin. The first moving mechanism is arranged on the top side of the device body, and the second moving mechanism is arranged on the bottom side of the device body.

4. The fatigue strength testing device according to claim 3, characterized in that: The first moving mechanism also includes: a first telescopic component, which is arranged on the top of the device body, the first telescopic component includes a first telescopic member, the first telescopic member is at least partially built into the second accommodating space and can be telescoped back and forth longitudinally relative to the device body, and the first moving member is connected to the first telescopic member.

5. The fatigue strength testing device according to claim 4, characterized in that: The first moving mechanism also includes: at least one group of first guide components, each group of the first guide components includes: a first guide rail and at least one first slider, each of the first guide rails is arranged on the inner wall of the second accommodating space and extends longitudinally, the first slider is slidably connected to its corresponding first guide rail, and the first moving member is connected to the first slider.

6. The fatigue strength testing device according to claim 3, characterized in that: The second moving mechanism also includes: a second telescopic component, which is arranged on the bottom side of the second accommodating space, and the second telescopic component includes a second telescopic member, which can reciprocate and telescope relative to the device body along the first direction, and the second moving member is connected to the second telescopic member.

7. The fatigue strength testing device according to claim 6, characterized in that: The second moving mechanism also includes: at least one group of second guide components, each group of the second guide components includes: a second guide rail and at least one second slider, each second guide rail is arranged at the bottom of the second accommodating space and extends along the first direction, the second slider is slidably connected to its corresponding second guide rail, and the second moving member is connected to the second slider.

8. The fatigue strength testing device according to claim 3, characterized in that: Also includes: A third moving mechanism, wherein one side of the device body has an opening communicating with the second accommodating space, and the third moving mechanism is arranged on a side of the device body close to the opening and is at least partially built into the second accommodating space through the opening; Wherein, the third moving mechanism includes a third moving member, and the third moving member can reciprocate between the inside and outside of the second accommodating space through the opening, and the working condition simulation cabin is arranged on the third moving member.

9. The fatigue strength testing device according to claim 8, characterized in that: A door is arranged on the side of the working condition simulation cabin facing the device body, and an observation window is arranged on the door.

10. The fatigue strength testing device according to claim 8 or 9, characterized in that: An explosion-proof window is arranged on one side of the device body opposite to the opening.

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