A hydraulic pulse testing device

Abstract

This utility model discloses a hydraulic pulse testing device, relating to the field of hydraulic testing technology. The device includes a frame, with an oil pump station placed at the bottom. A buffer tank is located inside the frame, with a return oil circuit fixedly connected to the top surface of the buffer tank. An oil inlet pipe is fixedly connected to the lower side wall of the buffer tank. An oil outlet pipe is fixedly connected to one side of the top surface of the oil pump station. The bottom end of the return oil circuit is fixedly connected to the top end of the oil outlet pipe. An output pipe is fixedly connected to the middle side wall of the buffer tank, with a four-way connector fixedly connected to the end of the output pipe. A branch pipe is fixedly connected to the end of the four-way connector. A connecting pipe is fixedly connected to the side wall of the return oil circuit. This utility model has good applicability, not only meeting the technical requirements of high-frequency high-pressure pulse durability testing, but also significantly improving testing stability, automation, system safety, and ease of use.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic testing technology, specifically to an oil pressure pulse testing device. Background Technology

[0002] Hydraulic systems are widely used in various industrial equipment. Their key components need to withstand long-term high-pressure alternating loads. Especially in systems such as engine cooling, fuel supply, and gearbox lubrication, durability directly affects the reliability and safety of the entire machine. Therefore, hydraulic components must undergo pressure pulse tests simulating actual operating conditions before mass production to test their fatigue life under high-frequency (e.g., 2-3Hz), high-pressure (up to 20 bar), and high-temperature (e.g., 90℃) conditions.

[0003] Typical hydraulic pulse testing requires components such as a stable hydraulic power source, temperature control system, pressure regulation system, test chamber, control and acquisition system, etc. The system must have the ability to accurately control frequency, pressure amplitude, temperature constantness, and pulse waveform consistency.

[0004] Current hydraulic pulse testing systems face several technical shortcomings and engineering challenges in practical engineering applications, primarily in the following aspects:

[0005] First, the system response is lagging and the pressure control waveform is distorted: Traditional proportional valves or ordinary solenoid valves have limited response speed and cannot support high-precision pulse loading at a frequency of 2-3Hz, resulting in distorted test waveforms. The pressure peak and rise / fall time cannot be strictly controlled, making it difficult to meet the stringent requirements of fatigue simulation.

[0006] Second, the pressure fluctuations in multiple channels are large and the test consistency is poor: When multiple components are tested in parallel, the instantaneous load changes in each channel will cause system pressure fluctuations. Traditional systems lack dynamic compensation capabilities and cannot guarantee that each device under test (DUT) will withstand the same amplitude of pulse pressure, which affects the comparability and reliability of test results.

[0007] Third, the temperature control accuracy and oil stability are not high: the traditional heating control method is open-loop or lag response PID control, which makes the oil temperature prone to drift and affects the material stress response; at the same time, the oil is prone to deterioration in high frequency shear and high temperature environment, and if there is a lack of effective filtration and monitoring methods, it may cause pipeline blockage and component damage.

[0008] Fourth, the level of automation is low and the response to abnormal working conditions is insufficient: most existing systems are mainly operated by PLC with simple touch screen, lacking complete functions such as abnormal alarm, linkage protection, and remote diagnosis. The system reliability and long-term unattended testing capability are insufficient. In order to solve the above problems, the inventor proposes a hydraulic pulse testing device. Utility Model Content

[0009] In order to address the problems of poor testing stability, low automation, low system safety, and low ease of use in current hydraulic pulse testing systems, the purpose of this utility model is to provide a hydraulic pulse testing device.

[0010] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: an oil pressure pulse testing device, including a frame, an oil pump station placed at the bottom of the frame, a buffer tank arranged inside the frame, a return oil circuit fixedly connected to the top surface of the buffer tank, an oil inlet pipe fixedly connected to the lower side wall of the buffer tank, an oil outlet pipe fixedly connected to one side of the top surface of the oil pump station, the bottom end of the return oil circuit fixedly connected to the top end of the oil outlet pipe, an output pipe fixedly connected to the middle side wall of the buffer tank, a four-way connector fixedly connected to the end face of the output pipe, a branch pipe fixedly connected to the end of the four-way connector, a connecting pipe fixedly connected to the side wall of the return oil circuit, a four-way connector also provided at the end of the connecting pipe, and the branch pipe fixedly connected to the four-way connector on the connecting pipe.

[0011] Preferably, rollers are provided at all four corners of the bottom surface of the frame, and the rollers are self-locking. Pushing the frame allows the device to move via the rollers at the bottom of the frame. After moving to the desired position, the rollers need to be self-locked to improve the stability of the device. An HMI is fixedly installed on the outer wall of the frame, and the side wall of the buffer tank is fixedly connected to the inner wall of the frame. A first sensor is installed on the upper part of the side wall of the buffer tank, and a second sensor is installed on the side wall of the oil outlet pipe, which runs through the frame. The first sensor is a level, pressure, and temperature detection sensor used to detect the level, pressure, and temperature. The second sensor is a flow sensor. The first sensor can monitor the liquid level and internal pressure, as well as the temperature of the oil outlet pipe, and the second sensor can be used to monitor the total flow rate of the oil circuit.

[0012] Preferably, a recovery tank is provided below the buffer tank, through which leaked oil can be recovered. The test piece is installed on the branch pipe, and a solenoid valve is installed on the side wall of the branch pipe. There are three branch pipes, which are evenly distributed from bottom to top. During the test, the heat source in the oil pump station heats the oil to the required test temperature. Then, the medium oil is delivered to the pipeline in a constant flow or constant pressure mode. After passing through the buffer tank, the solenoid valve quickly opens and closes to control the oil to pass through or remain in the three-way DUT, i.e., the test piece circuit. When the solenoid valve is open, the pressure provided by the oil pump acts on the three products. When the solenoid valve is closed, there is no flow in the pipeline. The total flow of the oil circuit can be monitored by the second sensor, the liquid level height and internal pressure can be monitored by the first sensor, and the temperature sensor in the pump station monitors the temperature of the oil outlet pipe. The valve and the frequency converter work simultaneously to realize high-frequency high-pressure pulses in the circuit.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: This device can not only meet the technical requirements of high frequency high voltage pulse durability testing, but also significantly improve the test stability, automation level, system safety and ease of use. It is suitable for reliability verification and life assessment of various hydraulic pipelines, joints, cooling circuits and other products. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Fig. 1 This is a schematic diagram of the overall structure of this utility model.

[0016] Fig. 2 This is another structural schematic diagram of the present utility model.

[0017] In the diagram: 1. Oil pump station; 2. Recovery tank; 3. Frame; 4. Buffer tank; 5. HMI; 6. Four-way valve; 7. First sensor; 8. Oil return line; 9. Oil inlet pipe; 10. Oil outlet pipe; 11. Second sensor; 12. Frequency converter; 13. Connecting pipe; 14. Branch pipe; 15. Solenoid valve; 16. Test piece. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Example: Figs. 1-2As shown, this utility model provides an oil pressure pulse testing device, including a frame 3, an oil pump station 1 placed at the lower part of the frame 3, a buffer tank 4 inside the frame 3, a return oil circuit 8 fixedly connected to the top surface of the buffer tank 4, an oil inlet pipe 9 fixedly connected to the lower part of the side wall of the buffer tank 4, an oil outlet pipe 10 fixedly connected to one side of the top surface of the oil pump station 1, the bottom end of the return oil circuit 8 fixedly connected to the top end of the oil outlet pipe 10, an output pipe fixedly connected to the middle part of the side wall of the buffer tank 4, a four-way connector 6 fixedly connected to the end face of the output pipe, a branch pipe 14 fixedly connected to the end of the four-way connector 6, a connecting pipe 13 fixedly connected to the side wall of the return oil circuit 8, a four-way connector 6 also provided at the end of the connecting pipe 13, and the branch pipe 14 fixedly connected to the four-way connector 6 on the connecting pipe 13.

[0020] Rollers are provided at all four corners of the bottom surface of frame 3, and the rollers are self-locking.

[0021] By adopting the above technical solution, the frame 3 is pushed, and the device can be moved by the rollers set at the bottom of the frame 3. After moving to the required position, the rollers need to be self-locked to improve the stability of the device. An HMI5 is fixedly installed on the outer wall of the frame 3.

[0022] The side wall of the buffer tank 4 is fixedly connected to the inner wall of the frame 3. A first sensor 7 is provided on the upper part of the side wall of the buffer tank 4, and a second sensor 11 is provided on the side wall of the oil outlet pipe 10. The oil outlet pipe 10 passes through the frame 3.

[0023] By adopting the above technical solution, the first sensor 7 is a liquid level, pressure and temperature detection sensor, used to detect liquid level, pressure and temperature, and the second sensor 11 is a flow sensor. The first sensor 7 can monitor the liquid level height and internal pressure, as well as the temperature of the oil outlet pipe 10, and the second sensor 11 can be used to monitor the total flow of the oil circuit.

[0024] A recycling tank 2 is provided below the buffer tank 4.

[0025] By adopting the above technical solution, the leaked oil can be recovered through the recovery tank 2.

[0026] The test piece 16 is provided on the branch pipe 14, and a solenoid valve 15 is provided on the side wall of the branch pipe 14. There are three branch pipes 14, and the three branch pipes 14 are evenly distributed from bottom to top.

[0027] By adopting the above technical solution, during testing, the heat source inside the oil pump station 1 is heated to the temperature required for testing. Then, the medium oil is delivered to the pipeline in a constant flow or constant pressure mode. After passing through the buffer tank 4, the solenoid valve 15 quickly opens and closes to control the oil to pass through or remain stationary in the three-way DUT, i.e., the circuit of the test piece 16. When the solenoid valve 15 is open, the pressure provided by the oil pump acts on the three-way products. When the solenoid valve 15 is closed, there is no flow in the pipeline. The total flow of the oil circuit can be monitored by the second sensor 11, the first sensor 7 can monitor the liquid level and internal pressure, the temperature sensor in the pump station monitors the temperature of the oil outlet pipe 10, and the valve and the frequency converter 12 work simultaneously to realize high-frequency high-pressure pulses in the circuit.

[0028] Working principle: When in use, the heat source in the oil pump station 1 heats the oil to the required test temperature, and delivers the medium oil to the pipeline in a constant flow or constant pressure mode. After passing through the buffer tank 4, the solenoid valve 15 quickly opens and closes to control the oil flow or stagnation in the three-way DUT circuit. When the solenoid valve 15 is open, the pressure provided by the oil pump acts on the three-way products. When the solenoid valve 15 is closed, there is no flow in the pipeline. The total flow of the oil circuit can be monitored by the second sensor 11, and the liquid level and internal pressure can be monitored by the first sensor 7, as well as the temperature of the oil outlet pipe 10. The high-frequency high-pressure pulse in the circuit is achieved by the simultaneous operation of the valve and the frequency converter 12. Leaked oil is recovered through the recovery tank 2. The operator can observe through the window and operate on the HMI5. The entire system is controlled by PLC.

[0029] All standard parts used in this invention can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art, and the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here.

[0030] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A hydraulic pulse testing device, comprising a frame (3), characterized in that: An oil pump station (1) is placed at the lower part of the frame (3). A buffer tank (4) is installed inside the frame (3). A return oil circuit (8) is fixedly connected to the top surface of the buffer tank (4). An oil inlet pipe (9) is fixedly connected to the lower part of the side wall of the buffer tank (4). An oil outlet pipe (10) is fixedly connected to one side of the top surface of the oil pump station (1). The bottom end of the return oil circuit (8) is fixedly connected to the top end of the oil outlet pipe (10). An output pipe is fixedly connected to the middle part of the side wall of the buffer tank (4). A four-way connector (6) is fixedly connected to the end face of the output pipe. A branch pipe (14) is fixedly connected to the end of the four-way connector (6). A connecting pipe (13) is fixedly connected to the side wall of the return oil circuit (8). A four-way connector (6) is also provided at the end of the connecting pipe (13). The branch pipe (14) is fixed to the four-way connector (6) on the connecting pipe (13).

2. The hydraulic pulse testing device as described in claim 1, characterized in that, The frame (3) is provided with rollers at the four corners of its bottom surface, and the rollers are self-locking.

3. The hydraulic pulse testing device as described in claim 1, characterized in that, The inner wall of the side wall rain frame (3) of the buffer tank (4) is fixedly connected, and a first sensor (7) is provided on the upper part of the side wall of the buffer tank (4).

4. The hydraulic pulse testing device as described in claim 1, characterized in that, The oil outlet pipe (10) is provided with a second sensor (11) on its side wall, and the oil outlet pipe (10) passes through the frame (3).

5. The hydraulic pulse testing device as described in claim 1, characterized in that, A recycling tank (2) is provided below the buffer tank (4).

6. The hydraulic pulse testing device as described in claim 1, characterized in that, The branch pipe (14) is provided with a test piece (16), and the side wall of the branch pipe (14) is provided with a solenoid valve (15).

7. The hydraulic pulse testing device as described in claim 1, characterized in that, There are three branch pipes (14), and the three branch pipes (14) are evenly distributed from bottom to top.

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