A hydraulic pulse test bench based on a structure fatigue test bench

Abstract

The utility model discloses a hydraulic pulse test platform based on structure fatigue test platform, including structure fatigue test platform, hydraulic oil cylinder II and oil supplementing system, utilize the hydraulic pulse test platform construction of existing structure fatigue test platform to thereby reduced test cost, has enlarged test ability range, the left cavity piston rod of hydraulic oil cylinder II is through connecting device and the piston rod rigid connection of hydraulic oil cylinder I in structure fatigue test platform, and the right cavity of hydraulic oil cylinder II is communicated with the import of measured piece through the catheter, and the left cavity of hydraulic oil cylinder II is communicated with the main oil tank in structure fatigue test platform through the catheter, hydraulic oil cylinder II and structure fatigue test platform constitute loading system, be used to inject the oil liquid of preset pressure to measured piece, oil supplementing system includes oil injection pump II, constant temperature oil tank, temperature sensor and the temperature control device of being able to heat and cool, one side is used to inject oil to the right cavity of hydraulic oil cylinder II and measured piece, and on the other hand, the oil temperature is always kept in the test range.

Description

Technical Field

[0001] This utility model relates to the testing field of hydraulic pipes for engineering machinery, specifically a hydraulic pulse test bench based on a structural fatigue test bench, that is, using existing structural test bench equipment to test the durability and life of hydraulic pipes. Background Technology

[0002] As an important component of the hydraulic system, hydraulic pipelines are responsible for transmitting media such as hydraulic oil, enabling pressure to be transmitted in the system and ensuring the normal operation of equipment. Therefore, their pressure resistance, sealing performance, durability and lifespan directly affect the reliability of the system. Thus, it is essential to conduct necessary bench tests on hydraulic pipelines during the design verification phase.

[0003] The utility model "Constant Temperature Controlled Hydraulic Hoses Pulse Test Bench" (Announcement No.: CN 206845589 U) discloses a constant temperature controlled hydraulic hose pulse test bench, which can achieve precise control of test pressure and temperature, and solves the problem that the temperature of the hydraulic oil in the hose will continuously rise due to the impact during pulse testing, eventually exceeding the specified range. However, this test bench still has some problems: 1. The pressure cylinders and servo valves used in this test bench are expensive, resulting in high test costs; 2. The GB / T 7939-2008 "Test Method for Hydraulic Hose Assembly" cited in this patent has been invalidated. Its requirement for the oil temperature of fatigue test: 100℃±3℃ has been cancelled in the latest standard. At the same time, the oil temperature in actual use of engineering machinery generally does not exceed 80℃, and the test component is generally required to not exceed 60℃. Therefore, the oil heating device used in this test bench is no longer applicable. 3. If the tested component has no protective device, and it ruptures due to high temperature and pressure, the oil spray may cause personal injury or death. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a hydraulic pulse testing bench based on a structural fatigue testing rig. This bench utilizes existing structural fatigue testing equipment resources to construct the hydraulic pulse testing bench, thereby reducing testing costs, expanding testing capabilities, and allowing the loading of test specimens using the hydraulic system load spectrum measured at the vehicle's operating site. This achieves equivalence between the test conditions and actual operating conditions, making the test results more realistic and convincing. A temperature control device is also included to maintain the oil in the constant-temperature tank at the test temperature. Furthermore, a transparent protective device is installed on the test specimens, allowing observation of the test process while preventing oil splashing and ensuring safety.

[0005] This utility model is achieved according to the following technical solution: A hydraulic pulse testing bench based on a structural fatigue testing rig includes a structural fatigue testing rig, a hydraulic cylinder II, and an oil replenishment system. The piston rod of the left chamber of hydraulic cylinder II is rigidly connected to the piston rod of hydraulic cylinder I in the structural fatigue testing rig via a connecting device. The right chamber of hydraulic cylinder II is connected to the inlet of the test piece via a conduit, and the left chamber of hydraulic cylinder II is connected to the main oil tank in the structural fatigue testing rig via a conduit. Hydraulic cylinder II and the structural fatigue testing rig constitute a loading system for injecting oil at a preset pressure into the test piece. The oil replenishment system includes an oil injection pump II, a constant temperature oil tank, a temperature sensor, and a temperature control device capable of heating and cooling. The oil injection pump II is connected to the constant temperature oil tank and the right chamber of hydraulic cylinder II via a conduit for injecting oil into the right chamber of hydraulic cylinder II and the test piece. The temperature sensor is installed on the constant temperature oil tank and the test piece respectively to detect the oil temperature. The temperature control device is activated by an electronic control system to adjust the oil temperature to always maintain it within the test range.

[0006] In some embodiments, a two-position two-way solenoid valve is connected between the outlet of the test piece and the constant temperature oil tank via a conduit. During the test, when the temperature sensor on the test piece detects that the oil temperature exceeds the test requirements, the electronic control system controls the two-position two-way solenoid valve to be energized, and the two-position two-way solenoid valve switches from open to open, so that the high-temperature oil in the test piece is discharged into the constant temperature oil tank.

[0007] In some embodiments, the test piece is placed in a transparent protective device during the test.

[0008] In some embodiments, a pressure sensor is connected in series in the conduit between the right cavity of the hydraulic cylinder II and the inlet of the test piece.

[0009] In some embodiments, a pressure sensor and a pressure gauge are connected in series in the conduit between the right chamber of the hydraulic cylinder II and the oil injection pump II.

[0010] In some embodiments, a check valve is connected in series in the outlet pipeline of the oil injection pump II; the check valve and the oil injection pump II are also connected in parallel with an overflow valve.

[0011] In some embodiments, a force sensor and a displacement sensor are installed on the piston rod of the hydraulic cylinder I.

[0012] In some embodiments, the right chamber of hydraulic cylinder I is connected to the main oil tank via a conduit, the left chamber of hydraulic cylinder I is connected to port A of the proportional valve via a conduit, port P of the proportional valve is connected to injection pump I via a conduit, and port T of the proportional valve is connected to the main oil tank via a conduit; the accumulator is connected in the pipeline between port P of the proportional valve and injection pump I.

[0013] In some embodiments, a check valve is connected in series in the outlet pipeline of the oil injection pump I; the check valve and the oil injection pump I are also connected in parallel with an overflow valve.

[0014] In some embodiments, a pressure sensor is installed in the right chamber of the hydraulic cylinder I; a pressure sensor and a pressure gauge are connected in series in the pipeline of the relief valve.

[0015] The beneficial effects of this utility model are: 1. The main equipment of the loading system in this utility model adopts the equipment in the existing structural test bench, thus reducing the test cost and expanding the test capability range; 2. This utility model can use the hydraulic system load spectrum collected at the vehicle operation site to load the test piece, so as to realize the equivalence between the test conditions and the actual conditions, making the test results closer to the actual situation and more convincing. 3. The temperature control device used in this utility model can not only raise the temperature of the test oil, but also lower it, covering a wide range of test temperature requirements, and can be flexibly adjusted according to the test requirements of the test piece; 4. The protective device for the test piece used in this utility model can both allow people to observe the test situation normally and prevent personnel from being injured or killed by high-temperature and high-pressure oil sprayed out due to pipeline rupture. Attached Figure Description

[0016] The accompanying drawings, as part of this utility model, are used to provide a further understanding of the present utility model. The illustrative embodiments and descriptions of the present utility model are used to explain the present utility model, but do not constitute an undue limitation of the present utility model. Obviously, the drawings described below are merely some embodiments; those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0017] In the attached diagram: Figure 1 This is a schematic diagram of a hydraulic pulse testing bench based on a structural fatigue testing bench according to the present invention. Figure 2 This is a schematic diagram of the connection of the electrical control system of this utility model.

[0018] Figure labels: Hydraulic cylinder I 1, Accumulator 2, Proportional valve 3, Check valve 4, Motor 5, Pump 6, Main oil tank 7, Relief valve 8, Pressure sensor 9, Pressure gauge 10, Force sensor 11, Displacement sensor 12, Connecting device 13, Hydraulic cylinder II 14, Pressure sensor 15, Transparent protective device 16, Connecting valve body 17, Measured component 18, Connecting valve body 19, Pressure gauge 20, Pressure sensor 21, Two-position two-way solenoid valve 22, Check valve 23, Pump 24, Relief valve 25, Motor 26, Temperature control device 27, Thermostatic oil tank 28, Temperature sensor 29, Temperature sensor 30; Pressure sensor 31.

[0019] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the present invention in any way, but rather to illustrate the concept of the present invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0021] In the description of this utility model, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0022] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0023] like Figure 1 , Figure 2As shown, a hydraulic pulse testing bench based on a structural fatigue testing rig includes a structural fatigue testing rig, a hydraulic cylinder II 14, and an oil replenishment system. The piston rod of the left chamber of hydraulic cylinder II 14 is rigidly connected to the piston rod of hydraulic cylinder I 1 in the structural fatigue testing rig via a connecting device 13. The right chamber of hydraulic cylinder II 14 is connected to the connecting valve body 17 at the inlet of the test piece 18 (i.e., the hydraulic pipe) via a conduit. The left chamber of hydraulic cylinder II 14 is connected to the main oil tank 7 in the structural fatigue testing rig via a conduit. Hydraulic cylinder II and the structural fatigue testing rig constitute a loading system for injecting hydraulic fluid into the test piece. The oil is supplied with oil at a preset pressure. The oil replenishment system 14 includes an oil injection pump II (composed of a pump 24 and a motor 26), a constant temperature oil tank 28, temperature sensors 29 and 30, and a temperature control device 27 capable of heating and cooling. The oil injection pump II is connected to the constant temperature oil tank 28 and the right cavity of the hydraulic cylinder II 14 through a conduit, and is used to inject oil into the right cavity of the hydraulic cylinder II 14 and the test piece 18. The temperature sensors 29 and 30 are respectively installed on the constant temperature oil tank 28 and the test piece 18, and are used to detect the oil temperature. The temperature control device 27 is activated through the electronic control system to adjust the oil temperature to always keep it within the test range.

[0024] Further plans will continue to be considered. Figure 1 , Figure 2 As shown, a two-position two-way solenoid valve 22 is connected to the outlet valve body 19 of the test piece 18 and the constant temperature oil tank 28 via a conduit. During the test, when the temperature sensor 29 on the test piece 18 detects that the oil temperature exceeds the test requirements, the electronic control system controls the two-position two-way solenoid valve 22 to be energized, and the two-position two-way solenoid valve 22 changes from open to open, and the high temperature oil in the test piece 18 is discharged into the constant temperature oil tank 28.

[0025] Further plans will continue to be considered. Figure 1 As shown, during the test, the test piece 18 was placed in the transparent protective device 16.

[0026] Further plans will continue to be considered. Figure 1 As shown, a pressure sensor 15 is connected in series in the conduit between the right cavity of the hydraulic cylinder II 14 and the inlet of the test piece 18.

[0027] Further plans will continue to be considered. Figure 1 As shown, a pressure sensor 21 and a pressure gauge 20 are connected in series in the conduit between the right chamber of hydraulic cylinder II 14 and oil pump II.

[0028] Further plans will continue to be considered. Figure 1 As shown, a check valve 23 is connected in series in the outlet pipeline of the oil injection pump II (composed of pump 24 and motor 26); the check valve 23 and the oil injection pump II are also connected in parallel to an overflow valve 25.

[0029] The following provides a further explanation of the specific structure of the aforementioned structural fatigue testing rig.

[0030] like Figure 1 As shown, a force sensor 11 and a displacement sensor 12 are installed on the piston rod of hydraulic cylinder I1.

[0031] Further plans will continue to be considered. Figure 1 As shown, the right chamber of hydraulic cylinder I1 is connected to the main oil tank 7 through a conduit, the left chamber of hydraulic cylinder I1 is connected to port A of proportional valve 3 through a conduit, port P of proportional valve 3 is connected to oil injection pump I (composed of pump 6 and motor 5) through a conduit, and port T of proportional valve 3 is connected to the main oil tank 7 through a conduit; accumulator 2 is connected in the pipeline between port P of proportional valve 3 and oil injection pump I.

[0032] Further plans will continue to be considered. Figure 1 As shown, a check valve 4 is connected in series in the outlet pipeline of the oil injection pump I (composed of pump 6 and motor 5); the check valve 4 and the oil injection pump I are also connected in parallel with an overflow valve 8.

[0033] Further plans will continue to be considered. Figure 1 As shown, a pressure sensor 31 is installed in the right chamber of hydraulic cylinder I1; a pressure sensor 9 and a pressure gauge 10 are connected in series in the pipeline of relief valve 8.

[0034] The following is in conjunction with the appendix Figure 1 and attached Figure 2 The working principle of the hydraulic pulse test bench based on the above-mentioned structural fatigue test bench is given.

[0035] 1. In the hydraulic pulse test bench, before the test begins, when the temperature sensor 30 detects that the oil temperature in the constant temperature oil tank 28 does not meet the test requirements, the electronic control system controls the temperature control device 27 to work until the temperature sensor 30 detects that the oil temperature is qualified and then stops.

[0036] 2. In the hydraulic pulse test bench, before the test begins, the electrical control system drives the motor 5 to drive the pump 6 to inject oil into the accumulator 2.

[0037] 3. In the hydraulic pulse test bench, before the test begins, after the oil temperature in the constant temperature oil tank 28 reaches the standard, the electrical control system causes the motor 26 to work and drive the pump 24 to inject oil into the right chamber of the hydraulic cylinder II 14 and the test piece 18.

[0038] 4. In the hydraulic pulse test bench, after the test begins, when the proportional valve 3 is energized in the left position, its A and P ports are connected. The accumulator 2 injects oil into the left chamber of hydraulic cylinder I1, pushing the piston rod to move to the right. The right chamber of hydraulic cylinder I1 discharges oil into the main oil tank 7 through its B port. Under the action of the connecting device 13, the piston rod of hydraulic cylinder II14 also moves to the right synchronously. The left chamber of hydraulic cylinder II14 draws oil from the main oil tank 7 through its B port, thereby providing pressure for the oil in the test piece 18. The pressure sensor 31 records the pressure change process in the left chamber of hydraulic cylinder I1. The force sensor 11 and displacement sensor 12 record the force and displacement changes on the piston cylinder of hydraulic cylinder I1, respectively. The pressure sensor 15 records the pressure change process in the test piece 18.

[0039] 5. In the hydraulic pulse test bench, after the test begins, when the proportional valve 3 is energized in the right position, its A port and T port are connected, and the left chamber of hydraulic cylinder I1 can discharge oil into the main oil tank 7. At this time, the two piston cylinders move to the left synchronously. The right chamber of hydraulic cylinder I1 draws oil from the main oil tank 7 through its B port, and the left chamber of hydraulic cylinder II14 discharges oil into the main oil tank 7 through its B port. At this time, the electrical control system causes the motor 26 to work and drive the pump 24 to inject oil into the right chamber of hydraulic cylinder II14 and the test piece 18. The pressure sensor 31 records the pressure change process in the left chamber of hydraulic cylinder I1, the force sensor 11 and the displacement sensor 12 record the force and displacement change process on the piston cylinder of hydraulic cylinder I1, and the pressure sensor 15 records the pressure change process in the test piece 18.

[0040] 6. In the hydraulic pulse test bench, during the test, the temperature of the oil in the constant temperature oil tank 28 is monitored by the temperature sensor 30. When the oil temperature does not meet the test requirements, the electronic control system activates the temperature control device 27, and stops when the temperature reaches the target.

[0041] 7. In the hydraulic pulse test bench, during the test, the oil temperature in the test piece 18 will rise due to the continuous impact on the oil. When the temperature sensor 29 detects that the temperature exceeds the test requirements, the two-position two-way solenoid valve 22 is energized, and its A port and P port are connected. The high-temperature oil in the test piece 18 is discharged into the constant temperature oil tank 28. At the same time, the motor 26 drives the pump 24 to inject oil into the right chamber of the hydraulic cylinder II 14 and the test piece 18, so that the oil temperature in the test piece 18 is always kept within the test range.

[0042] 8. The transparent protective device 16 installed in the hydraulic pulse test bench allows people to observe the test situation while preventing the possibility of high-temperature and high-pressure oil spraying out and causing injury or death.

[0043] In summary, this utility model provides a hydraulic pulse testing bench based on a structural fatigue testing rig, achieving the following functions and effects: 1. In the hydraulic pulse test bench, the pumps, motors, proportional valves, hydraulic cylinders, accumulators and other equipment used in the loading system are all from existing structural fatigue test benches, which reduces the test cost and expands the range of test capabilities.

[0044] 2. In the hydraulic pulse test bench, the hydraulic system load spectrum collected at the vehicle operation site can be used for loading, so as to realize the equivalence between the test conditions and the actual conditions, making the test results closer to the actual situation and more convincing.

[0045] 3. In the hydraulic pulse test bench, the temperature control device can not only raise the temperature of the oil, but also lower the temperature of the oil, covering a wide range of test temperature requirements, and can be flexibly adjusted according to the test requirements of the test piece.

[0046] 4. In the hydraulic pulse test bench, the transparent protective device allows for normal observation of the test situation while preventing personnel injury caused by high-temperature and high-pressure oil ejected due to pipeline rupture.

[0047] Numerous specific details are set forth in the specification provided herein. However, it will be understood that embodiments of the present invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0048] Furthermore, those skilled in the art will understand that although some embodiments described herein include certain features found in other embodiments but not others, combinations of features from different embodiments are also within the scope of protection of this invention and form different embodiments. For example, in the embodiments described above, those skilled in the art can use them in combination based on known technical solutions and the technical problems to be solved by this application.

[0049] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-described technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A hydraulic pulse testing bench based on a structural fatigue testing bench, comprising a structural fatigue testing bench, characterized in that, Also includes: Hydraulic cylinder II has its left chamber piston rod rigidly connected to the piston rod of hydraulic cylinder I in the structural fatigue testing rig via a connecting device. The right chamber of hydraulic cylinder II is connected to the inlet of the test piece via a conduit, and the left chamber of hydraulic cylinder II is connected to the main oil tank in the structural fatigue testing rig via a conduit. Hydraulic cylinder II and the structural fatigue testing rig constitute a loading system for injecting oil at a preset pressure into the test piece. The oil replenishment system includes an oil injection pump II, a constant temperature oil tank, a temperature sensor, and a temperature control device capable of heating and cooling. The oil injection pump II is connected to the constant temperature oil tank and the right cavity of the hydraulic cylinder II via a conduit, and is used to inject oil into the right cavity of the hydraulic cylinder II and the test piece. The temperature sensor is installed on the constant temperature oil tank and the test piece respectively, and is used to detect the oil temperature. The temperature control device is activated by the electronic control system to adjust the oil temperature to always keep it within the test range.

2. The hydraulic pulse testing bench based on a structural fatigue testing bench according to claim 1, characterized in that: A two-position two-way solenoid valve is connected to the outlet of the test component and the constant temperature oil tank via a conduit. During the test, when the temperature sensor on the test component detects that the oil temperature exceeds the test requirements, the electronic control system controls the two-position two-way solenoid valve to be energized, and the two-position two-way solenoid valve switches from open to open, so that the high-temperature oil in the test component is discharged into the constant temperature oil tank.

3. The hydraulic pulse testing bench based on a structural fatigue testing bench according to claim 1, characterized in that: During the test, the test piece was placed in a transparent protective device.

4. The hydraulic pulse testing bench based on a structural fatigue testing bench according to claim 1, characterized in that: A pressure sensor is connected in series in the conduit between the right cavity of the hydraulic cylinder II and the inlet of the test piece.

5. A hydraulic pulse testing bench based on a structural fatigue testing bench according to claim 1, characterized in that: A pressure sensor and a pressure gauge are connected in series in the conduit between the right chamber of the hydraulic cylinder II and the oil pump II.

6. A hydraulic pulse testing bench based on a structural fatigue testing bench according to claim 1, characterized in that: A check valve is connected in series in the outlet pipeline of the oil injection pump II; the check valve and the oil injection pump II are also connected in parallel with an overflow valve.

7. A hydraulic pulse testing bench based on a structural fatigue testing bench according to claim 1, characterized in that: A force sensor and a displacement sensor are installed on the piston rod of the hydraulic cylinder I.

8. A hydraulic pulse testing bench based on a structural fatigue testing bench according to claim 1, characterized in that: The right chamber of hydraulic cylinder I is connected to the main oil tank via a conduit, the left chamber of hydraulic cylinder I is connected to port A of the proportional valve via a conduit, port P of the proportional valve is connected to oil injection pump I via a conduit, and port T of the proportional valve is connected to the main oil tank via a conduit; the accumulator is connected in the pipeline between port P of the proportional valve and oil injection pump I.

9. A hydraulic pulse testing bench based on a structural fatigue testing bench according to claim 8, characterized in that: A check valve is connected in series in the outlet pipeline of the oil injection pump I; the check valve and the oil injection pump I are also connected in parallel with an overflow valve.

10. A hydraulic pulse testing bench based on a structural fatigue testing bench according to claim 9, characterized in that: A pressure sensor is installed in the right chamber of the hydraulic cylinder I; a pressure sensor and a pressure gauge are connected in series in the pipeline of the relief valve.

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