Fatigue test equipment

Abstract

The utility model provides fatigue test equipment, which belongs to the technical field of carrier rockets and comprises a storage tank, a pneumatic system and a water replenishing system. The pneumatic system communicates with the gas inlet and outlet through the proportional valve; the water replenishing system communicates with the liquid inlet and outlet; when the fatigue test equipment is used, liquid in the storage tank is pushed by the pneumatic system to enter the storage tank test piece, the fatigue test is carried out on the storage tank test piece under the action of the pneumatic system, the principle that water is pushed by air is adopted, and the fatigue test equipment is not influenced by the service life of a pressure reducing valve and a back pressure valve; the pressing precision, the pressure increasing rate and the pressure reducing rate can be better controlled in 20,000 times of pressure cycle fatigue tests; in the pneumatic system, the proportional valve is communicated with the storage tank, and the proportional valve has the characteristics of stepless adjustment of pressure and speed, low service power, less heat and low noise, so that impact fluctuation during reversing of a conventional switch type pneumatic control valve can be avoided, and pressure control is more direct and accurate.

Description

Technical Field

[0001] The utility model relates to the technical field of launch vehicles, and particularly relates to a fatigue test device. Background Art

[0002] As one of the key subsystems of a launch vehicle, the rocket body structure has propellant tanks mostly made of high-strength aluminum alloy materials through assembly welding. It belongs to a large thin-walled aluminum alloy welded structure. On the one hand, it serves as a liquid container to achieve functions such as propellant storage, pressurization and transportation. On the other hand, it serves as the main structure of the rocket to transmit flight forces.

[0003] Due to the complex processing technology and high processing cost of the tanks, before confirming the final structure and performance of the tanks, it is necessary to process tank test pieces. The tank test pieces generally have two upper and lower cavities. Through corresponding tests and experiments on the tank test pieces, and according to the results of the tests and experiments, the final production of the tanks is carried out.

[0004] The corresponding tests and experiments carried out on the tank test pieces include: the pressure cycle fatigue test of the tank test piece, that is, repeatedly performing pressure cycles on the tank test piece to ensure that the structural strength, mechanical properties, deformation, etc. of the tank test piece meet the actual use requirements after multiple pressurizations - depressurizations. Generally, a fatigue test device is used to carry out the fatigue test of the tank test piece. The fatigue test device can perform pressure cycle loading on test pieces with different volumes, and can meet the requirements of dual-channel synchronous coordination (synchronous pressure cycle of the upper and lower cavities) loading and continuous loading of 10,000 - 20,000 times for a single test.

[0005] Currently, the fatigue test device for tank test pieces includes two independent devices: a control system (electric control) and a pressure regulating system (mechanical). The user remotely controls the pressure regulating system through the control system to carry out the fatigue test on the tank test piece.

[0006] As Figure 2 shown, during use, first use a pre-charge pump to pre-charge the tank test piece to ensure that the tank test piece is filled with normal-pressure water and the excess air in the tank test piece is exhausted. After the pre-charge is completed, set the test parameters through the control system, such as the pressurization pressure of the booster pump, the pressure rise rate, the output pressure, the pressure holding time, the pressure relief pressure, the number of tests, etc. Then remotely control the pressure regulating system to work to achieve the function of carrying out the fatigue test on the tank test piece.

[0007] However, in the working conditions of high frequency and long time of the existing fatigue test device, the main control valves of the device include: pressure regulating valves, back pressure valves, etc. During the long-term fatigue test process, the failure rate is relatively high. Often, when the fatigue test times of the tank test piece have not met the test requirements, the device has already failed and stopped running, affecting the continuity of the fatigue test of the tank test piece. Summary of the Utility Model

[0008] Therefore, the technical problem to be solved by the present utility model is to overcome the defect that the failure rate of the main control valve of the equipment is relatively high during the long-term fatigue test in the existing fatigue test equipment, so as to provide a fatigue test equipment.

[0009] To solve the above technical problem, the present utility model provides a fatigue test equipment, including:

[0010] A storage tank, having a liquid inlet and outlet and a gas inlet and outlet, and the liquid inlet and outlet are adapted to communicate with the liquid inlet of the storage tank test piece;

[0011] A pneumatic system, which is communicated with the gas inlet and outlet of the storage tank through a proportional valve, and a first pressure relief valve is arranged between the proportional valve and the gas inlet and outlet;

[0012] A water replenishing system, which is communicated with the liquid inlet and outlet of the storage tank.

[0013] Optionally, the pneumatic system includes:

[0014] An air storage tank, having an air inlet and an air outlet, the air outlet is communicated with two outlets through a pipeline, and proportional valves are respectively arranged on the pipeline between the air outlet and the two outlets;

[0015] An air inflation pump, which is communicated with the air inlet of the air storage tank.

[0016] Optionally, the air outlet of the air storage tank and any one of the outlets are respectively communicated through two parallel branch pipelines, and a proportional valve is respectively arranged on each branch pipeline.

[0017] Optionally, a first filter, a first safety valve and a solenoid valve are further arranged on the branch pipeline.

[0018] Optionally, there are two solenoid valves, which are respectively arranged on the upstream section and the downstream section of the branch pipeline.

[0019] Optionally, a main pipeline is arranged between the air outlet of the air storage tank and the branch pipeline, and a second pressure relief valve is arranged on the main pipeline.

[0020] Optionally, a second safety valve is further arranged on the main pipeline, and a pressure transmitter is connected to the second safety valve.

[0021] Optionally, the water replenishing system includes:

[0022] A water tank, having a liquid outlet;

[0023] A water injection pump, the inlet end of which is communicated with the liquid outlet of the water tank, and the outlet end of which is communicated with the liquid inlet and outlet of the storage tank.

[0024] Optionally, a second filter is provided on the pipeline between the inlet end of the injection water pump and the liquid outlet of the water tank.

[0025] Optionally, the liquid inlet and outlet are located at the bottom end of the storage tank, the gas inlet and outlet are located at the top end of the storage tank, and a pressure transmitter is further connected to the top end of the storage tank.

[0026] The technical solution of the present utility model has the following advantages:

[0027] 1. When the fatigue test equipment provided by the present utility model is in use, the liquid in the storage tank is pushed into the storage tank test piece through the pneumatic system, and the storage tank test piece is subjected to fatigue test under the action of the pneumatic system. Adopting the principle of "pneumatic pushing water", it is not affected by the service life of the pressure reducing valve and the back pressure valve, and can better control the pressure accuracy, pressure rising rate and pressure dropping rate in the 20,000 - time pressure cycle fatigue test; in addition, since a proportional valve is adopted in the pneumatic system and is communicated with the gas inlet and outlet of the storage tank, the proportional valve has stepless adjustment of pressure and speed, and has the characteristics of small power consumption, less heat generation and low noise. Therefore, it can avoid the impact fluctuation during the commutation of the conventional switch - type pneumatic control valve, and the pressure control is more direct and accurate.

[0028] 2. For the fatigue test equipment provided by the present utility model, in the pneumatic system, the air storage tank is inflated by an air charging pump, and the air can be directly compressed on - site for pressurization without configuring a separate air source.

[0029] 3. Compared with the conventional fatigue test equipment, the equipment provided by the present utility model has a simpler process, lower failure rate, no vulnerable parts, higher maintenance cost and reliability; the control logic of the measurement and control system is more direct, and the programming difficulty is greatly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required to be used in the description of the specific embodiments or the prior art. Obviously, the following - described drawings are some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0031] Figure 1 It is a system diagram of a specific embodiment of the fatigue test equipment provided in the embodiment of the present utility model;

[0032] Figure 2 It is a system diagram of the fatigue test equipment before improvement;

[0033] Figure 3 It is a system diagram of the pneumatic system in the fatigue test equipment provided in the embodiment of the present utility model;

[0034] Figure 4 This is the system diagram of the water replenishing system in the fatigue testing equipment provided in the embodiments of the present utility model.

[0035] Explanation of reference numerals:

[0036] 1. Storage tank; 2. Gas inlet and outlet; 3. Liquid inlet and outlet; 4. Test piece of storage tank; 5. Pneumatic system; 6. Proportional valve; 7. Gas storage tank; 8. Output port; 9. Inflation pump; 10. First filter; 11. First safety valve; 12. Solenoid valve; 13. First pressure relief valve; 14. Second safety valve; 15. Second pressure relief valve; 16. Water replenishing system; 17. Water tank; 18. Water injection pump; 19. Second filter; 20. Pre-charge pump; 21. Booster pump; 22. Accumulator; 23. Pressure regulating valve; 24. Output valve; 25. Back pressure valve. Specific embodiments

[0037] Next, the technical solutions of the present utility model will be clearly and completely described in conjunction with the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0038] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and 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 should not be construed as a limitation of the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0039] In the description of the present utility model, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements. 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.

[0040] In addition, the technical features involved in different embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0041] Such asFigure 1 As shown, a specific implementation of the fatigue test equipment provided in this embodiment includes: a storage tank 1, a pneumatic system 5 and a water replenishment system 16, the storage tank 1 has a liquid inlet and outlet 3 and a gas inlet and outlet 2, the liquid inlet and outlet 3 is suitable for being connected with the liquid inlet of the tank test piece 4, so as to inject water and perform fatigue testing on the tank test piece 4; the pneumatic system 5 is connected with the gas inlet and outlet 2 of the storage tank 1 through a proportional valve 6, which is used to control the pressure injected into the storage tank 1, so as to realize water injection and fatigue testing on the tank test piece 4; a first pressure relief valve 13 is arranged between the proportional valve 6 and the gas inlet and outlet 2 of the storage tank 1, which is used to relieve the pressure of the gas in the storage tank 1, so as to realize repeated flushing and deflation of the storage tank 1; the water replenishment system 16 is connected with the liquid inlet and outlet 3 of the storage tank 1, so as to replenish the storage tank 1 with water.

[0042] The fatigue testing equipment provided in this embodiment, when in use, pushes the liquid in the storage tank 1 into the tank test piece 4 through the pneumatic system 5, and performs fatigue testing on the tank test piece 4 under the action of the pneumatic system 5, which is not affected by the life of the pressure reducing valve and the back pressure valve 25, and can better control the pressure accuracy, pressure increase rate, and pressure reduction rate in 20,000 pressure cycle fatigue tests; in addition, since the pneumatic system 5 adopts a proportional valve 6 to be connected with the gas inlet and outlet 2 of the storage tank 1, the proportional valve 6 has the characteristics of stepless adjustment of pressure and speed, low power consumption, low heat generation, and low noise, so it can avoid the impact fluctuation when the conventional switch-type air control valve is switched, and the pressure control is more direct and accurate.

[0043] like Figure 2 As shown, the fatigue test equipment before improvement is used. When working, the pre-filling pump 20 fills the tank test piece 4 with normal pressure water. After the pre-filling is completed, the medium (water) is pressurized by the booster pump 21, and the pressurized medium is buffered and stored by the accumulator 22. Then, the pressure in the tank test piece 4 is adjusted to the pressure required for the test by the pressure regulating valve 23; after maintaining the pressure for a certain period of time, the pressure in the tank test piece 4 is released to the pressure required for the test by the back pressure valve 25. After the pressure relief is completed, a complete pressure cycle is completed. The fatigue test equipment before improvement mainly controls valves including: the pressure regulating valve 23 and the back pressure valve 25. During the long-term fatigue test process, the failure rate is high. Often, when the fatigue test times of the tank test piece 4 have not met the test requirements, the equipment has already failed and stopped running, affecting the continuity of the fatigue test of the tank test piece 4.

[0044] like Figure 3As shown in the figure, in the fatigue test device provided in this embodiment, the pneumatic system 5 includes: an air storage tank 7 and an air inflation pump 9. The air storage tank 7 has an air inlet and an air outlet. The air outlet is connected to two output ports 8 through a pipeline. A proportional valve 6 is respectively provided on the pipeline between the air outlet and the two output ports 8. Through the setting of the two output ports 8, the upper and lower cavities of the tank test piece 4 can be respectively controlled in pressure, so as to meet the test requirements. The air inflation pump 9 is connected to the air inlet of the air storage tank 7. By inflating the air storage tank 7 through the air inflation pump 9, compressed air can be directly compressed on-site for pressurization, and there is no need to configure a separate air source. Of course, the above description is not restrictive. In some alternative embodiments, the air inflation pump 9 can be omitted. For example, other air sources can be used.

[0045] As Figure 3 shown in the figure, in this embodiment, the air outlet of the air storage tank 7 and any one of the output ports 8 are respectively connected through two parallel branch pipelines. A proportional valve 6 is respectively provided on each branch pipeline. A pressure gauge is provided behind the proportional valve 6. A first pressure relief valve 13 is provided between the branch pipeline and the output port 8. Through the setting of the pressure gauge and the first pressure relief valve 13, it is used for the air pressure on the pipeline between the branch pipeline and the output port 8, and the first pressure relief valve 13 can be used to relieve the pressure of the storage tank 1. Through the setting of the two branch pipelines, one can be used as a spare, so as to improve the reliability of the equipment during use. Of course, the above description is not restrictive. In some alternative embodiments, the above one-spare-one-use setting can also be omitted, and only one branch pipeline can be used to complete the connection of the gas path.

[0046] As Figure 3 shown in the figure, in this embodiment, a first filter 10, a first safety valve 11 and a solenoid valve 12 are also provided on the branch pipeline. Specifically, there are two solenoid valves 12, which are respectively arranged on the upstream section and the downstream section of the branch pipeline. Through the setting of the solenoid valve 12, it is used to control the on-off of the branch pipeline. Through the setting of the first filter 10, it is used to purify the gas passing through the branch pipeline. Through the setting of the first safety valve 11, it is used to control the gas pressure in the branch pipeline to avoid overpressure problems. Of course, the above description is not restrictive. In some alternative embodiments, the first filter 10, the first safety valve 11 and the solenoid valve 12 can all be omitted, or other types of valves can be used for replacement, or valves for realizing the above functions can be provided on other pipelines.

[0047] As Figure 3As shown in the figure, in this embodiment, there is a main pipeline between the air outlet of the gas storage tank 7 and the branch pipeline, and a second pressure relief valve 15 is provided on the main pipeline. The second pressure relief valve 15 is provided to timely discharge the relatively high gas pressure in the gas storage tank 7, thereby ensuring the safety of the gas storage tank 7. Of course, the above description is not restrictive. In some alternative embodiments, the second pressure relief valve 15 can be omitted or arranged at other positions, such as on the gas storage tank 7, etc.

[0048] As Figure 3 shown in the figure, in this embodiment, a second safety valve 14 is also provided on the main pipeline, and a pressure transmitter is connected to the second safety valve 14. Through the setting of the second safety valve 14, it is used to detect the pressure in the main pipeline and in the gas storage tank 7, and transmit it to the control unit in real time through the pressure transmitter. Of course, the above description is not restrictive. In some alternative embodiments, the second safety valve 14 can be omitted or arranged at other positions. For example, it can be arranged on the gas storage tank 7.

[0049] As Figure 4 shown in the figure, in the fatigue test equipment provided in this embodiment, the water replenishing system 16 includes: a water tank 17 and a water injection pump 18. The water tank 17 has a liquid outlet; the inlet end of the water injection pump 18 is communicated with the liquid outlet of the water tank 17, and the outlet end of the water injection pump 18 is communicated with the liquid inlet and outlet 3 of the storage tank 1. When in use, the water in the water tank 17 is injected into the storage tank 1 through the water injection pump 18.

[0050] As Figure 4 shown in the figure, in this embodiment, a second filter 19 is provided on the pipeline between the inlet end of the water injection pump 18 and the liquid outlet of the water tank 17. Through the setting of the second filter 19, it is used to purify the water quality to ensure the cleanliness of the water injected into the storage tank 1. Of course, the above description is not restrictive. In some alternative embodiments, the second filter 19 can be omitted or arranged at other positions, such as on the outlet end of the water injection pump 18, etc.

[0051] As Figure 1 shown in the figure, in the fatigue test equipment provided in this embodiment, there are two storage tanks 1. The liquid inlet and outlet 3 of each storage tank 1 are both located at the bottom end, and the gas inlet and outlet 2 are both located at the top end of the storage tank 1. A pressure transmitter is also connected to the top end of the storage tank 1. Through the setting of this pressure transmitter, it is used to monitor the pressure in the storage tank 1 in real time, so as to achieve precise control of the fatigue test. Of course, the above description is not restrictive. In some alternative embodiments, the pressure transmitter at the top end of the storage tank 1 can be omitted, or replaced by other pressure detection devices, or pressure detection devices can be arranged at other positions on the intake pipeline. For example, a pressure gauge can be arranged behind the proportional valve 6 on the branch pipeline of the pneumatic system 5.

[0052] Working principle:

[0053] As Figure 1 , Figure 4 shown, at the beginning, first, the storage tank 1 is filled with water through the water replenishing system 16. Specifically, the water in the water tank 17 is injected into the storage tank 1 by the injection water pump 18. At the outlet of the water replenishing system 16, it can be connected to the liquid inlet and outlet 3 of the storage tank 1 through a hose.

[0054] As Figure 1 , Figure 3 shown, after the storage tank 1 is filled with water, the valve between the water replenishing system 16 and the storage tank 1 is closed, the valve between the storage tank 1 and the test piece storage tank 4 is opened, and the storage tank 1 is inflated through the pneumatic system 5, so as to inject the liquid in the storage tank 1 into the test piece storage tank 4. As shown in the test piece storage tank 4, while injecting the liquid, the excess air is discharged.

[0055] As Figure 3 shown, during the fatigue test, the branch pipeline is supplied with gas through the air storage tank 7 of the pneumatic system 5, and the air pressure is conveyed into the storage tank 1 through the branch pipeline. Specifically, a proportional valve 6 is arranged on the branch pipeline to adjust the air supply volume, and a pressure gauge is arranged behind the proportional valve 6 to monitor the pressure change, so as to accurately inject the air pressure into the storage tank 1, and the pressure is transmitted into the test piece storage tank 4 through the storage tank 1. When relieving the pressure, the first pressure relief valve 13 on the branch pipeline can be used to relieve the pressure, or a pressure relief valve can be arranged at other positions to relieve the pressure. For example, a pressure relief valve can be arranged at the gas inlet and outlet 2 of the storage tank 1. Repeatedly performing stamping and pressure relief in this way, so as to complete multiple fatigue tests on the test piece storage tank 4. Specifically, generally, 10,000 to 20,000 pressure cycles need to be completed.

[0056] Obviously, the above embodiments are only examples clearly described and not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. And the obvious changes or modifications derived therefrom are still within the protection scope of the present invention.

Claims

1. A fatigue test device, characterized in that, Comprising: A storage tank (1) having a liquid inlet / outlet (3) and a gas inlet / outlet (2), wherein the liquid inlet / outlet (3) is adapted to communicate with the liquid inlet of a storage tank test piece (4); A pneumatic system (5) communicating with the gas inlet / outlet (2) of the storage tank (1) through a proportional valve (6), and a first pressure relief valve (13) is provided between the proportional valve (6) and the gas inlet / outlet (2); A water replenishing system (16) communicating with the liquid inlet / outlet (3) of the storage tank (1).

2. The fatigue test device according to claim 1, wherein The pneumatic system (5) includes: An air storage tank (7) having an air inlet and an air outlet, the air outlet communicating with two output ports (8) through a pipeline, and the proportional valve (6) is respectively provided on the pipeline between the air outlet and the two output ports (8); An air inflation pump (9) communicating with the air inlet of the air storage tank (7).

3. The fatigue test device according to claim 2, wherein, The air outlet of the air storage tank (7) is respectively communicated with any one of the output ports (8) through two parallel branch pipelines, and the proportional valve (6) is respectively provided on each branch pipeline.

4. The fatigue testing device according to claim 3, characterized in that A first filter (10), a first safety valve (11) and a solenoid valve (12) are further provided on the branch pipeline.

5. The fatigue test device according to claim 4, wherein, There are two solenoid valves (12), which are respectively arranged on the upstream section and the downstream section of the branch pipeline.

6. The fatigue test device according to claim 3, wherein A main pipeline is provided between the air outlet of the air storage tank (7) and the branch pipeline, and a second pressure relief valve (15) is provided on the main pipeline.

7. The fatigue testing device according to claim 6, wherein, A second safety valve (14) is further provided on the main pipeline, and a pressure transmitter is connected to the second safety valve (14).

8. The fatigue test device according to any one of claims 1-7, characterized in that, The water replenishing system (16) includes: A water tank (17) having a liquid outlet; A water injection pump (18), the inlet end of which communicates with the liquid outlet of the water tank (17), and the outlet end of which communicates with the liquid inlet / outlet (3) of the storage tank (1).

9. The fatigue test device according to claim 8, wherein A second filter (19) is provided on the pipeline between the inlet end of the water injection pump (18) and the liquid outlet of the water tank (17).

10. The fatigue testing device according to any one of claims 1-7, characterized in that, The liquid inlet / outlet (3) is located at the bottom end of the storage tank (1), the gas inlet / outlet (2) is located at the top end of the storage tank (1), and a pressure transmitter is further connected to the top end of the storage tank (1).

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