Low-temperature tension-compression fatigue testing device for diaphragm capsule

Abstract

The utility model discloses a low-temperature tension and compression fatigue testing device for a diaphragm capsule, and belongs to the technical field of tension and compression fatigue testing, and the technical scheme is characterized in that the low-temperature tension and compression fatigue testing device comprises a containing barrel, and liquid nitrogen is contained in the containing barrel; the base is arranged in the containing barrel and connected with the bottom of the containing barrel; the fixing assembly is connected with the base, the fixing assembly is used for fixing a diaphragm capsule, and the diaphragm capsule is immersed in liquid nitrogen; a lifting frame is arranged between the driving device and the base and used for enabling the driving device to be higher than the containing barrel, and the driving device is connected with the diaphragm capsule, so that the diaphragm capsule can be subjected to repeated pulling and pressing operation, and repeated pulling and pressing operation on the diaphragm capsule in a liquid nitrogen environment is achieved; and the accuracy and the reliability of a test result are improved.

Description

Technical Field

[0001] This application relates to the technical field of tensile and compressive fatigue testing, and particularly to a low-temperature tensile and compressive fatigue testing device for a diaphragm box. Background Art

[0002] As an important part of the material mechanics performance testing, low-temperature tensile and compressive vibration testing is widely used in fields such as aerospace, automobile manufacturing, and precision instruments to evaluate the durability and reliability of materials in extreme environments.

[0003] At present, large liquid launch vehicles generally have the potential danger of longitudinal coupled vibration (POGO) during flight. POGO vibration is a resonance phenomenon of a closed-loop system when the vibration frequency, phase, and other parameters of the large liquid rocket body structure and the liquid path system on the rocket are consistent or close. It is an unstable closed-loop self-excited vibration. The accumulator is an important device for suppressing the POGO vibration of liquid rockets, and mainly uses a metal diaphragm box type accumulator for vibration reduction design. The vibration environment of the accumulator is relatively complex, and the fatigue life faces great challenges. At present, there is a lack of corresponding testing devices applied to low-temperature environments in China.

[0004] In order to realize the fatigue life test of the diaphragm box in a liquid nitrogen environment, this application provides a set of testing devices that can perform repetitive tensile and compressive operations on the diaphragm box to complete the fatigue life test. Utility Model Content

[0005] In order to perform repetitive tensile and compressive operations on the diaphragm box in a liquid nitrogen environment and improve the accuracy and reliability of the test results, the present utility model provides a low-temperature tensile and compressive fatigue testing device for a diaphragm box.

[0006] The low-temperature tensile and compressive fatigue testing device for a diaphragm box provided by the present utility model adopts the following technical solutions:

[0007] A low-temperature tensile and compressive fatigue testing device for a diaphragm box includes a holding barrel filled with liquid nitrogen; a base disposed in the holding barrel and connected to the bottom of the holding barrel; a fixing assembly connected to the base for fixing the diaphragm box, and the diaphragm box is immersed in the liquid nitrogen; a driving device, with a lifting frame disposed between the driving device and the base to raise the height of the driving device above the holding barrel, and the driving device is connected to the diaphragm box and can perform repetitive tensile and compressive operations on the diaphragm box.

[0008] By adopting the above technical solution, during use, the connection end of the driving device is connected to the diaphragm box, and then the diaphragm box is connected to the bottom plate through the fixing component. Then, the bottom plate, the diaphragm box, and the driving device are all placed in the storage bucket, and liquid nitrogen is filled into the storage bucket to submerge the diaphragm box. The driving device is started, and the driving device performs a pulling and pressing operation on the diaphragm box. The device for low-temperature pulling and pressing vibration testing can achieve repeated pulling and pressing operations on the diaphragm box in a liquid nitrogen environment, ensure the low-temperature conditions during the testing process, and improve the accuracy and reliability of the test results.

[0009] The height of the driving device is higher than that of the storage bucket through the lifting frame, thereby reducing the influence of the evaporated gas of the liquid nitrogen on it, and achieving the effect of improving the accuracy of the test results.

[0010] Preferably, the fixing component includes a sleeve and an adapter flange. The adapter flange is sleeved on the sleeve and is located at the bottom of the sleeve. The adapter flange is connected to the base through the first bolt; the diaphragm box includes a connection flange, and the connection flange abuts against the top of the sleeve, and the connection flange and the sleeve are fixed through the second bolt.

[0011] By adopting the above technical solution, the adapter flange is sleeved on the bottom of the sleeve and is connected to the base through the first bolt, enhancing the stability and reliability between the fixing component and the base; the connection flange in the diaphragm box abuts against the top of the sleeve and is fixed through the second bolt, realizing a firm connection between the diaphragm box and the fixing component, and facilitating the disassembly and assembly of the diaphragm box.

[0012] Preferably, a support component is connected to the top of the lifting frame. The support component includes a bottom plate, a support rod, and a support block. The bottom plate is connected to the lifting frame, the bottom end of the support rod is connected to the bottom plate, the support block is connected to the top end of the support rod, the driving device is connected to the support rod and the support block, and the driving device passes through the base and is connected to the diaphragm box.

[0013] By adopting the above technical solution, the combined design of the bottom plate, the support rod, and the support block ensures the stable operation of the driving device during the low-temperature pulling and pressing vibration test, and enhances the reliability of the overall device.

[0014] Preferably, the driving device includes a driving component and a control component. The driving component includes a motor, a first pulley, a second pulley and a synchronous belt. A driving cavity is formed inside the supporting block. The motor is connected to the supporting block, and the driving shaft of the motor passes through the supporting block and extends into the driving cavity. The first pulley and the second pulley are both arranged in the driving cavity. The first pulley is connected to the driving shaft of the motor. The second pulley is rotatably connected to the supporting block. The synchronous belt is sleeved on the first pulley and the second pulley and is in contact with both the first pulley and the second pulley. One end of the control component is connected to the second pulley, and the other end passes through the bottom plate and is connected to the diaphragm box.

[0015] By adopting the above technical solution, the driving device realizes precise control of the diaphragm box through the driving component and the control component. Among them, the motor drives the first pulley to rotate, and the power is transmitted to the second pulley through the synchronous belt, so that the control component can stably drive the diaphragm box to perform repetitive pulling and pressing operations, thereby improving the accuracy and stability of the test.

[0016] Preferably, an activity cavity is formed inside the support rod. The control component is arranged in the activity cavity. The control component includes a lead screw, a slider and a fixed cylinder. One end of the lead screw passes through the support rod and the support block and extends into the driving cavity. The lead screw is connected to the second pulley and is rotatably connected to the support rod. The slider is sleeved on the lead screw and is threadedly connected to the lead screw. A guide block is connected to the side wall of the slider. A guide groove communicating with the activity cavity is formed inside the support rod. The guide block is arranged in the guide groove and is slidably connected to the support rod. The fixed cylinder is sleeved on the lead screw and is connected to the slider. A gap is left between the fixed cylinder and the lead screw. The bottom end of the fixed cylinder passes through the bottom plate and is connected to the diaphragm box.

[0017] By adopting the above technical solution, the second pulley drives the lead screw to rotate. Through the sliding of the guide block in the guide groove, the lead screw drives the slider to slide, thereby realizing the precise displacement of the fixed cylinder, and ensuring the precise pulling and pressing operation of the diaphragm box.

[0018] Preferably, a connecting piece is arranged between the diaphragm box and the fixed cylinder. The bottom end of the fixed cylinder is sealed, and a screw rod is fixedly connected to the bottom end of the fixed cylinder. The first end of the connecting piece is threadedly connected to the screw rod. The diaphragm box includes a fixed rod threadedly connected to the connecting piece.

[0019] By adopting the above technical solution, the connection between the diaphragm box and the fixed cylinder is more stable and reliable, which is convenient for disassembly and assembly. At the same time, through the cooperation of the screw rod and the connecting piece, the stability and precision of the diaphragm box during the pulling and pressing operation are ensured.

[0020] Preferably, the motor is electrically connected to a control module.

[0021] By adopting the above technical solution, after the fixed cylinder is connected to the diaphragm box, the motor needs to drive the lead screw to reciprocate, so as to realize the reciprocating movement of the fixed cylinder driving the diaphragm box. The control module is used to accurately control the motor, thereby improving the working stability and precision of the driving device.

[0022] Preferably, it further includes a plurality of reinforcing frames. The bottom of the reinforcing frame is connected to the base, and the side wall of the reinforcing frame is connected to the lifting frame, which can increase the connection stability between the lifting frame and the base.

[0023] By adopting the above technical solution, the setting of the reinforcing frame enhances the connection stability between the lifting frame and the base, thereby improving the structural reliability of the entire device during the low-temperature tensile-compressive vibration test and reducing the test error caused by structural instability.

[0024] In summary, the present utility model has the following beneficial effects:

[0025] 1. During use, connect the connection end of the driving device to the diaphragm box, and then connect the diaphragm box to the bottom plate through the fixing component. Then, place the bottom plate, the diaphragm box, and the driving device in the storage barrel, fill liquid nitrogen into the storage barrel so that the liquid nitrogen submerges the diaphragm box. Start the driving device, and the driving device performs tensile-compressive operations on the diaphragm box. The device for low-temperature tensile-compressive vibration test can realize repetitive tensile-compressive operations on the diaphragm box in a liquid nitrogen environment, ensure the low-temperature conditions during the test, and improve the accuracy and reliability of the test results;

[0026] 2. The design of the fixing component and the diaphragm box makes the sample fixing more convenient and fast, improving the test efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is an overall structural schematic diagram of a low-temperature tensile-compressive fatigue test device for a diaphragm box.

[0028] Figure 2 is a schematic diagram of the position of the diaphragm box and the fixing component.

[0029] Figure 3 is a structural schematic diagram of the driving device.

[0030] Figure 4 is a structural schematic diagram of the reinforcing frame.

[0031] Figure 5 is Figure 3 an enlarged schematic diagram of part A in

[0032] DESCRIPTION OF THE REFERENCE NUMERALS:

[0033] 1. Holding bucket; 2. Base; 3. Diaphragm box; 31. Outer shell; 32. Connecting flange; 33. Diaphragm group; 34. Fixed plate; 35. Fixed rod; 4. Fixing component; 41. Sleeve; 42. Adapter flange; 5. Lifting frame; 6. Reinforcing frame; 61. Horizontal plate; 62. Vertical plate; 63. Reinforcing plate; 7. Supporting component; 71. Bottom plate; 72. Supporting rod; 721. Activity cavity; 722. Guide groove; 73. Supporting block; 731. Driving cavity; 8. Driving device; 81. Driving component; 811. Motor; 812. First pulley; 813. Second pulley; 814. Timing belt; 82. Control component; 821. Lead screw; 822. Slide block; 8221. Guide block; 823. Fixed cylinder; 8231. Screw; 9. Connecting piece. Detailed implementation mode

[0034] In order to enable those skilled in the art to better understand the technical solutions in this specification, the following will clearly and completely describe the technical solutions in the embodiments of this specification with reference to the accompanying drawings in the embodiments of this specification. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments.

[0035] In the description of the embodiments of this application, words such as "for example" or "for illustration" are used to represent examples, illustrations or explanations. Any embodiment or design solution described as "for example" or "for illustration" in the embodiments of this application should not be construed as being more preferred or having more advantages than other embodiments or design solutions. Exactly speaking, using words such as "for example" or "for illustration" aims to present relevant concepts in a specific way.

[0036] In the description of the embodiments of this application, the meaning of the term "a plurality" refers to two or more. For example, a plurality of systems refers to two or more systems, and a plurality of screen terminals refers to two or more screen terminals. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the technical features indicated. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. The terms "include", "comprise", "have" and their variants all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0037] A low-temperature tensile and compressive fatigue test device for a diaphragm box, referring to Figure 1 and Figure 2, including a storage barrel 1, a base 2, a fixing component 4, and a driving device 8. The storage barrel 1 contains liquid nitrogen inside. The base 2 is arranged inside the storage barrel 1 and is connected to the bottom of the storage barrel 1. The fixing component 4 is connected to the base 2, and the fixing component 4 is used to fix the diaphragm box 3. There is a lifting frame 5 arranged between the driving device 8 and the base 2, which is used to raise the height of the driving device 8 higher than that of the storage barrel 1. The driving device 8 is connected to the diaphragm box 3 and can perform repetitive pulling and pressing operations on the diaphragm box 3.

[0038] Start the driving device 8, and the driving device 8 performs pulling and pressing operations on the diaphragm box 3. This device for low-temperature pulling and pressing vibration testing can achieve repetitive pulling and pressing operations on the diaphragm box 3 in a liquid nitrogen environment, ensuring the low-temperature conditions during the testing process and improving the accuracy and reliability of the test results.

[0039] In this embodiment, the pulling and pressing vibration testing is carried out at a low temperature of -196 degrees Celsius.

[0040] Refer to Figure 1 , the storage barrel 1 is a cylindrical body with an open top and a sealed bottom. The barrel body is made of high-strength stainless steel material and has low-temperature resistance.

[0041] Refer to Figure 3 , the diaphragm box 3 includes a housing 31, a connecting flange 32, a diaphragm group 33, a fixing plate 34, and a fixing rod 35. The housing 31 is a cylindrical shell with an open top and a sealed bottom. A gas charging joint is fixedly connected to the bottom of the housing 31, and the gas charging joint is arranged outside the housing 31. The connecting flange 32 is sleeved on the housing 31 and is not connected to the top of the housing 31. The connecting flange 32 is fixedly connected to the housing 31.

[0042] Refer to Figure 3 , the diaphragm group 33 and the fixing plate 34 are both built inside the housing 31. The bottom of the diaphragm group 33 is fixedly connected to the bottom of the housing 31, the fixing plate 34 is fixedly connected to the top of the diaphragm group 33, the fixing rod 35 is arranged vertically, the bottom end of the fixing rod 35 is fixedly connected to the fixing plate 34, and the top end extends out of the housing 31. A thread is provided on the outer side wall of the top end of the fixing rod 35.

[0043] Refer to Figure 3 , the fixing rod 35 is used to connect to the driving device 8. A guiding member is fixedly connected to the top of the housing 31, and the guiding member is arranged above the fixing plate 34. The fixing rod 35 passes through the guiding member and is slidably connected to the guiding member to achieve the guiding of the fixing rod 35.

[0044] The driving device 8 drives the fixing rod to move reciprocally. The fixing rod drives the fixing plate to move, and the fixing plate drives the diaphragm group to move reciprocally, realizing the pulling and pressing test on the diaphragm group, and further realizing the fatigue life test on the diaphragm box.

[0045] Refer to Figure 2 andFigure 3 The fixing component 4 includes a sleeve 41 and an adapter flange 42. The sleeve 41 is cylindrical, and the adapter flange 42 is sleeved on the sleeve 41 and located at the bottom end of the sleeve 41. The adapter flange 42 is fixedly connected to the base 2 by a first bolt.

[0046] Refer to Figure 3 , the inner diameter of the sleeve 41 is the same as the outer diameter of the housing 31. The bottom of the housing 31 is inserted into the sleeve 41, and the connecting flange 32 abuts against the top of the sleeve 41 and is fixed by a second bolt.

[0047] The adapter flange 42 is sleeved on the bottom of the sleeve 41 and connected to the base 2 by a first bolt, enhancing the stability and reliability between the fixing component 4 and the base 2. The connecting flange 32 in the bellows 3 abuts against the top of the sleeve 41 and is fixed by a second bolt, realizing a firm connection between the bellows 3 and the fixing component 4 and facilitating the disassembly and assembly of the bellows 3.

[0048] Refer to Figure 2 , the lifting frame 5 is erected on the sleeve 41. The lifting frame 5 is formed by splicing a plurality of profiles, and the plurality of profiles are fixed by a third bolt. The structure of the lifting frame 5 is simple and has strong stability. At the same time, the height of the lifting frame 5 can be adjusted.

[0049] Refer to Figure 4 , a reinforcing frame 6 is connected to the bottom of the lifting frame 5. There are a plurality of reinforcing frames 6, which are used to increase the connection stability between the lifting frame 5 and the base 2. The reinforcing frame 6 includes a cross plate 61, a vertical plate 62 and a reinforcing plate 63. The cross plate 61, the vertical plate 62 and the reinforcing plate 63 are integrally formed. The vertical plate 62 is located at one end of the cross plate 61. There are two vertically arranged reinforcing plates 63, and the two reinforcing plates 63 are arranged in parallel. The two reinforcing plates 63 are respectively located on both sides of the vertical plate 62. The reinforcing plates 63 are fixedly connected to both the cross plate 61 and the vertical plate 62. The cross plate 61 is fixed to the base 2 by a fourth bolt, and the vertical plate 62 is fixed to the lifting frame 5 by a fifth bolt.

[0050] The setting of the reinforcing frame 6 enhances the connection stability between the lifting frame 5 and the base 2, thereby improving the structural reliability of the entire device during the low-temperature tensile and compressive vibration test and reducing the test error caused by structural instability.

[0051] Refer to Figure 2 , a support component 7 is connected to the top of the lifting frame 5. The support component 7 includes a bottom plate 71, a support rod 72 and a support block 73. The bottom plate 71 is fixedly connected to the top of the lifting frame 5. The support rod 72 is vertically arranged, and the bottom end of the support rod 72 is fixedly connected to the top of the bottom plate 71 and the top end is fixedly connected to the support block 73.

[0052] The combined design of the bottom plate 71, the support rod 72 and the support block 73 ensures the smooth operation of the driving device 8 during the low-temperature tensile and compressive vibration test.

[0053] Referring to Figure 3 , a driving cavity 731 is formed in the supporting block 73. The driving device 8 includes a driving component 81 and a control component 82. The driving component 81 includes a motor 811, a first pulley 812, a second pulley 813 and a synchronous belt 814. The motor 811 is fixedly connected to the supporting block 73, and the driving shaft of the motor 811 passes through the supporting block 73 and extends into the driving cavity 731. The motor 811 is electrically connected to a control module. The first pulley 812 and the second pulley 813 are both arranged in the driving cavity 731. The first pulley 812 is fixedly connected to the driving shaft of the motor 811. The second pulley 813 is rotatably connected to the supporting block 73 through a rotating shaft. The synchronous belt 814 is sleeved on the first pulley 812 and the second pulley 813 and is in contact with both the first pulley 812 and the second pulley 813.

[0054] Referring to Figure 3 and Figure 5 , a movable cavity 721 is formed in the support rod 72, and the control component 82 is arranged in the movable cavity 721. The control component 82 includes a lead screw 821, a slider 822 and a fixed cylinder 823. The lead screw 821 is arranged vertically. The top end of the lead screw 821 passes through the support rod 72 and the support block 73 and extends into the driving cavity 731. The lead screw 821 is fixedly connected to the second pulley 813. The slider 822 is sleeved on the lead screw 821 and is threadedly connected to the lead screw 821. A guiding groove 722 is formed in the inner wall of the support rod 72, and the guiding groove 722 communicates with the movable cavity 721. A guiding block 8221 is fixedly connected to the outer wall of the slider 822. The guiding block 8221 is arranged in the guiding groove 722 and is slidably connected to the support rod 72.

[0055] The motor 811 drives the first pulley 812 to rotate, transmits power to the second pulley 813 through the synchronous belt 814. The second pulley 813 drives the lead screw 821 to rotate. Through the sliding of the guiding block 8221 in the guiding groove 722, the lead screw 821 drives the slider 822 to slide, thereby realizing the precise displacement of the fixed cylinder 823, and ensuring the precise pulling and pressing operation of the diaphragm box 3.

[0056] Referring to Figure 3 and Figure 5 , the fixed cylinder 823 is sleeved on the lead screw 821 and is fixedly connected to the bottom of the slider 822, and there is a gap between the fixed cylinder 823 and the lead screw 821. The bottom end of the fixed cylinder 823 extends into the support rod 72 and passes through the bottom plate 71. The bottom end of the fixed cylinder 823 is sealed, and a screw 8231 is connected thereto. The screw 8231 is threadedly connected to a connecting member 9. During testing, the connecting member 9 is threadedly connected to the top end of the fixed rod 35.

[0057] The design of sealing the bottom end of the fixed cylinder 823 reduces the possibility of liquid nitrogen infiltration, further reduces the influence of the evaporated gas of liquid nitrogen on the driving device 8, and improves the accuracy of the test results. The connection between the bellows 3 and the fixed cylinder 823 is more stable and reliable, which is convenient for disassembly and assembly. At the same time, through the cooperation of the screw 8231 and the connecting piece 9, the stability and precision of the bellows 3 during the tension and compression operations are ensured.

[0058] The working principle of this application is as follows: When in use, connect the connecting piece 9 with the screw 8231, and then connect the fixing rod 35 of the bellows 3 with the connecting piece 9. Then start the motor 811. The motor 811 drives the first pulley 812 to rotate, transmits power to the second pulley 813 through the synchronous belt 814. The second pulley 813 drives the lead screw 821 to rotate. Through the sliding of the guide block 8221 in the guide groove 722, the lead screw 821 drives the slider 822 to slide, and the slider 822 drives the fixed cylinder 823 to move towards the fixing assembly 4, so that the bottom of the bellows 3 is inserted into the sleeve 41. The motor 811 stops, and the flange 32 and the top of the sleeve 41 are fixed by using the second bolt member.

[0059] Place the bottom plate 71, the bellows 3 and the fixing assembly 4 all inside the storage barrel 1, and fill liquid nitrogen into the storage barrel 1 so that the liquid nitrogen submerges the bellows 3. Start the motor 811 again, and through the control module, make the motor 811 perform precise reciprocating rotation, so that the fixed cylinder 823 reciprocates in the vertical direction, and then realize the tension and compression test of the diaphragm group 33. This device for low-temperature tension and compression vibration test can realize the repetitive tension and compression operation of the bellows 3 in the liquid nitrogen environment, ensure the low-temperature condition during the test, and improve the accuracy and reliability of the test results.

[0060] The embodiments of this specific implementation manner are all preferred embodiments of the present invention, and do not limit the protection scope of the present invention accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. A low-temperature tensile and compressive fatigue test device for an aneroid, characterized in that: It includes a storage barrel (1) which stores liquid nitrogen inside; a base (2) which is arranged inside the storage barrel (1) and connected to the bottom of the storage barrel (1); a fixing component (4) which is connected to the base (2) and is used to fix the diaphragm box (3), and the diaphragm box (3) is immersed in liquid nitrogen; a driving device (8), between which and the base (2) there is a lifting frame (5) for raising the height of the driving device (8) above the storage barrel (1), and the driving device (8) is connected to the diaphragm box (3) and can perform repetitive pulling and pressing operations on the diaphragm box (3).

2. The low-temperature tensile and compressive fatigue test device for an aneroid according to claim 1, wherein: The fixing component (4) includes a sleeve (41) and an adapter flange (42), the adapter flange (42) is sleeved on the sleeve (41) and located at the bottom of the sleeve (41), and the adapter flange (42) is connected to the base (2) through a first bolt; the diaphragm box (3) includes a connection flange (32), the connection flange (32) abuts against the top of the sleeve (41), and the connection flange (32) and the sleeve (41) are fixed through a second bolt.

3. A low-temperature tensile and compressive fatigue test device for an aneroid, characterized in that: At the top of the lifting frame (5) there is a support component (7), the support component (7) includes a bottom plate (71), a support rod (72) and a support block (73), the bottom plate (71) is connected to the lifting frame (5), the bottom end of the support rod (72) is connected to the bottom plate (71), the support block (73) is connected to the top end of the support rod (72), the driving device (8) is connected to the support rod (72) and the support block (73), and the driving device (8) passes through the base (2) and is connected to the diaphragm box (3).

4. A low-temperature tensile and compressive fatigue test device for an aneroid, characterized in that: The driving device (8) includes a driving component (81) and a control component (82), the driving component (81) includes a motor (811), a first pulley (812), a second pulley (813) and a synchronous belt (814), inside the support block (73) there is a driving cavity (731), the motor (811) is connected to the support block (73), and the driving shaft of the motor (811) passes through the support block (73) and extends into the driving cavity (731); the first pulley (812) and the second pulley (813) are both arranged inside the driving cavity (731), the first pulley (812) is connected to the driving shaft of the motor (811), the second pulley (813) is rotatably connected to the support block (73), the synchronous belt (814) is sleeved on the first pulley (812) and the second pulley (813) and abuts against both the first pulley (812) and the second pulley (813), and one end of the control component (82) is connected to the second pulley (813) and the other end passes through the bottom plate (71) and is connected to the diaphragm box (3).

5. The low-temperature tensile and compressive fatigue test device for an aneroid capsule according to claim 4, wherein: An activity cavity (721) is formed in the support rod (72), the control assembly (82) is arranged in the activity cavity (721), the control assembly (82) includes a lead screw (821), a slider (822) and a fixed cylinder (823), one end of the lead screw (821) passes through the support rod (72) and the support block (73) and extends into the driving cavity (731), the lead screw (821) is connected with the second belt pulley (813), and the lead screw (821) is rotatably connected with the support rod (72); The slider (822) is sleeved on the lead screw (821) and is in threaded connection with the lead screw (821). A guide block (8221) is connected to the side wall of the slider (822). A guide groove (722) communicated with the activity cavity (721) is formed in the support rod (72). The guide block (8221) is arranged in the guide groove (722) and is slidably connected with the support rod (72); The fixed cylinder (823) is sleeved on the lead screw (821) and is connected with the slider (822). A gap is left between the fixed cylinder (823) and the lead screw (821). The bottom end of the fixed cylinder (823) passes through the bottom plate (71) and is connected with the diaphragm box (3).

6. The low-temperature tensile and compression fatigue test device for an aneroid according to claim 5, characterized by: A connecting piece (9) is arranged between the diaphragm box (3) and the fixed cylinder (823). The bottom end of the fixed cylinder (823) is sealed, and a screw rod (8231) is fixedly connected to the bottom end of the fixed cylinder (823). The first end of the connecting piece (9) is in threaded connection with the screw rod (8231). The diaphragm box (3) includes a fixed rod (35) in threaded connection with the connecting piece (9).

7. A low-temperature tensile and compressive fatigue test device for an aneroid box according to claim 4 or 5, characterized in that: The motor (811) is electrically connected to a control module.

8. A low-temperature tensile and compression fatigue test device for an aneroid, characterized in that: It further includes a plurality of reinforcing frames (6). The bottom of the reinforcing frames (6) is connected with the base (2), and the side walls of the reinforcing frames (6) are connected with the lifting frame (5), which can increase the connection stability between the lifting frame (5) and the base (2).

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