A test platform for unloading valve performance inspection

Abstract

The utility model relates to unloading valve performance inspection technical field, concretely relates to a kind of test platform for unloading valve performance inspection, including oil storage tank, oil storage tank is connected with high pressure side oil inlet pipeline and low pressure side oil inlet pipeline respectively, and high pressure side interface of high pressure side oil inlet pipeline is used to connect with the unloading valve to be tested, and low pressure side interface of low pressure side oil inlet pipeline is used to connect with the unloading valve to be tested;High pressure side oil inlet pipeline is equipped with pneumatic oil pump one and pressure sensor one, and pressure sensor one is located between pneumatic oil pump one and high pressure side interface;Low pressure side oil inlet pipeline is equipped with pneumatic oil pump two and pressure sensor two;Pneumatic oil pump one is connected with wind bag by gas supply pipeline one, and gas supply pipeline one is equipped with proportional valve one;Pneumatic oil pump two is connected with wind bag by gas supply pipeline two, and gas supply pipeline two is equipped with proportional valve two.The utility model sets two proportional valves, can simulate the partial oil circuit pressure fluctuation in unloading valve actual work, improves test accuracy.

Description

Technical Field

[0001] This utility model relates to the field of unloading valve performance testing technology, specifically to a test platform for unloading valve performance testing. Background Technology

[0002] In modern hydraulic systems, unloading valves are core components ensuring stable equipment operation. In presses, unloading valves can quickly relieve pressure after a process, preventing system overheating and component wear. They can also prevent overload accidents through pressure threshold control, reduce no-load energy consumption to improve efficiency, and ensure stable pressure output, directly affecting workpiece machining accuracy. The performance of unloading valves directly determines the stability, safety, and operating efficiency of the hydraulic system.

[0003] Therefore, performance testing of unloading valves before they leave the factory and during operation and maintenance is crucial and a necessary step to ensure the reliable operation of hydraulic equipment. Currently, in hydraulic testing systems for testing hydraulic components, only one proportional valve is typically used to control the pressure of the main pipeline. For example, in the hydraulic control system of a hydraulic cylinder loading test bench with publication number CN113357225A, the oil source pressure is set through a proportional relief valve, and the pump flow rate can be adjusted according to the given proportional relief valve signal based on the required flow rate.

[0004] However, based on the existing hydraulic component performance testing principles, although this single proportional valve design is simple in structure and low in cost, it has the problem of insufficient testing accuracy when used to test the performance of unloading valves. It cannot simulate the pressure fluctuations in the local oil circuit during the actual operation of the unloading valve, such as the instantaneous pulse high pressure and the rapid downward low pressure. The pressure regulation response is slow and the overshoot is large, resulting in a large deviation between the test data and the actual working conditions. Utility Model Content

[0005] To address the technical problem that existing testing systems for verifying the performance of unloading valves typically only include a single proportional valve, which fails to simulate pressure fluctuations in the local oil circuit during actual operation of the unloading valve, such as instantaneous high-pressure pulses and rapid low-pressure drops, resulting in slow pressure regulation response and large overshoot, leading to significant deviations between test data and actual operating conditions, this invention provides a test platform for verifying the performance of unloading valves.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A test platform for performance testing of an unloading valve includes an oil reservoir connected to a high-pressure side oil inlet pipe and a low-pressure side oil inlet pipe. The high-pressure side oil inlet pipe has a high-pressure side interface at its end furthest from the oil reservoir, which is used to connect to the high-pressure side port of the unloading valve under test. The low-pressure side oil inlet pipe has a low-pressure side interface at its end furthest from the oil reservoir, which is used to connect to the low-pressure side port of the unloading valve under test. A pneumatic oil pump and a pressure sensor are installed on the high-pressure side oil inlet pipe, with the pressure sensor positioned between the pneumatic oil pump and the high-pressure side interface. The low-pressure side oil inlet pipe... The circuit is equipped with a second pneumatic oil pump and a second pressure sensor. The second pressure sensor is located between the second pneumatic oil pump and the low-pressure side interface. The first pneumatic oil pump is connected to the first air supply line, and the other end of the first air supply line is connected to the air receiver. The first air supply line is equipped with a proportional valve. The air receiver is also connected to the charging line and the booster line. The second pneumatic oil pump is connected to the second air supply line, and the other end of the second air supply line is connected to the air receiver. The second air supply line is equipped with a proportional valve. The oil tank is also connected to the return oil line. The end of the return oil line away from the oil tank is equipped with a return oil interface, which is used to connect to the oil discharge port of the unloading valve to be tested.

[0008] With the above structural design, during operation, the air receiver supplies air to the pneumatic oil pump 1 through air supply line 1. The proportional valve 1 on air supply line 1 can independently adjust the output pressure of the pneumatic oil pump 1, thereby controlling the oil pressure in the high-pressure side inlet pipeline. Similarly, the air receiver supplies air to the pneumatic oil pump 2 through air supply line 2. The proportional valve 2 can independently adjust the oil pressure in the low-pressure side inlet pipeline, simulating local oil circuit pressure fluctuations during the actual operation of the unloading valve. The pressure regulation response is fast, the overshoot is small, and the test data deviates little from the actual operating conditions. Furthermore, the oil reservoir is connected to the unloading port of the unloading valve under test through a return oil line. During the test, the oil discharged from the unloading valve can flow back to the oil reservoir through the return oil line, avoiding oil waste and ensuring continuous and stable testing without frequent oil replenishment.

[0009] As a preferred implementation of a test platform for testing the performance of an unloading valve, an oil mist separator is also provided on the first air supply line. The first oil mist separator is located between the air receiver and the first proportional valve. The first oil mist separator is used to supply lubricating oil to the first pneumatic oil pump; and / or, an oil mist separator is also provided on the second air supply line. The second oil mist separator is located between the air receiver and the second proportional valve. The second oil mist separator is used to supply lubricating oil to the second pneumatic oil pump.

[0010] With the above structural design, the oil mist separator on the first air supply line atomizes the lubricating oil and mixes it with compressed air, allowing it to enter the pneumatic oil pump 1 with the airflow and lubricate its moving parts. Similarly, the oil mist separator on the second air supply line provides atomized lubricating oil to the pneumatic oil pump 2, effectively reducing mechanical friction and wear inside the pneumatic oil pumps 1 and 2, preventing pump damage caused by dry friction, and extending the service life of the equipment. Furthermore, with sufficient lubrication, the pneumatic oil pumps 1 and 2 operate with higher precision and smaller output pressure fluctuations. The oil mist separators ensure stable operation of the pneumatic oil pumps 1 and 2, thereby guaranteeing the pressure regulation accuracy of the high-pressure and low-pressure inlet lines and avoiding problems such as slow pressure regulation response and large overshoot caused by insufficient lubrication of the pneumatic oil pumps 1 and 2, further improving the accuracy of test data.

[0011] As a preferred implementation of a test platform for testing the performance of unloading valves, a safety valve assembly is provided on the low-pressure side oil inlet pipeline, and the safety valve assembly is located between the pressure sensor and the low-pressure side interface.

[0012] The design pressure of the low-pressure side inlet pipeline is usually lower than that of the high-pressure side inlet pipeline. During testing, if the proportional valve 2 malfunctions or the pneumatic oil pump 2 loses control of its output pressure, the pressure in the low-pressure side inlet pipeline may exceed the safety threshold. With the above-described structural design, when this situation occurs, the safety valve assembly 1, located between the pressure sensor 2 and the low-pressure side interface, will automatically open to release pressure, reducing the pressure in the low-pressure side inlet pipeline to a safe range. This prevents excessive pressure from impacting the low-pressure side port of the unloading valve under test, while also protecting components such as the pressure sensor 2 and the pneumatic oil pump 2 from overload damage, thus improving the operational safety of the test platform.

[0013] As a preferred implementation of a test platform for testing the performance of unloading valves, a water droplet separator is installed on the air-filling pipeline, and a water droplet separator, a booster and a one-way valve are installed on the pressurization pipeline in sequence from far to near the air receiver.

[0014] Using the above structural design, the inflation pipeline is used to replenish compressed air to the air receiver. A water droplet separator on the pipeline filters out liquid moisture from the compressed air, preventing moisture accumulation after entering the air receiver. The booster pipeline is used to pressurize the air receiver when the pressure is insufficient. A second water droplet separator on the booster pipeline further filters moisture from the compressed air during the pressurization process. The dual water droplet separator design effectively reduces the water content in the compressed air, preventing corrosion of related components due to moisture and extending the equipment's service life. Furthermore, the arrangement of the second water droplet separator, the booster, and the one-way valve on the booster pipeline ensures that the dried compressed air is first pressurized to the required pressure by the booster, and then enters the air receiver through the one-way valve. The one-way valve prevents the compressed air in the air receiver from flowing back to the booster, ensuring that the pressure inside the air receiver remains within a stable range. Stable air receiver pressure is a prerequisite for the precise adjustment of the output pressure of pneumatic oil pumps one and two by proportional valves one and two, ensuring the pressure control accuracy of the high-pressure and low-pressure inlet pipelines and improving the reliability of test data.

[0015] As a preferred implementation of a test platform for testing the performance of unloading valves, the oil tank is connected to both ends of the circulating filter pipeline. The circulating filter pipeline is equipped with a motor pump group, a second safety valve group, and a circulating filter. The second safety valve group is located between the motor pump group and the circulating filter. The motor pump group is used to draw oil from the oil tank.

[0016] With the above structural design, during operation, the motor-pump unit draws oil from the oil storage tank. The oil first flows through safety valve group two (if the pipeline pressure is overloaded, safety valve group two automatically releases pressure to protect the motor-pump unit and pipeline), and then enters the circulating filter for filtration. The filtered clean oil flows back to the oil storage tank, forming an oil circulation filtration loop. This continuously removes metal debris, dust, and other impurities from the oil in the storage tank, preventing impurities from entering the high-pressure and low-pressure inlet pipelines and clogging the outlets of pneumatic oil pumps one and two, or the detection ports of pressure sensors one and two. It also prevents impurities from wearing down the internal seals and valve core of the unloading valve under test, ensuring that the unloading valve is tested in a clean oil environment and avoiding test errors or equipment damage caused by oil contamination.

[0017] As a preferred implementation of a test platform for testing the performance of an unloading valve, the second air supply line is connected to the second proportional valve and the second pneumatic oil pump. The air supply line is equipped with a pressure test switching valve, and the end of the air supply line away from the second proportional valve is equipped with an air inlet, which is used to connect to the air inlet of the unloading valve to be tested.

[0018] By adopting the above structural scheme, the compressed air from the air receiver can be introduced into the air inlet of the unloading valve under test by switching the air pressure test switching valve on and off, so as to realize the test of the air pressure control performance of the unloading valve. There is no need to build an additional independent air pressure test device, which expands the functional coverage of the test platform.

[0019] As a preferred implementation of a test platform for testing the performance of an unloading valve, it includes a test bracket for placing the unloading valve to be tested. The high-pressure side interface, low-pressure side interface, air inlet interface, and oil return interface are all located on the test bracket.

[0020] With the above structural design, the test bracket is specifically designed to hold the unloading valve under test, and integrates the high-pressure side interface, low-pressure side interface, air inlet interface, and oil return interface onto the test bracket. Operators only need to fix the unloading valve under test in the designated position on the test bracket to quickly connect the high-pressure side oil port, low-pressure side oil port, air inlet, and oil return port of the unloading valve to their corresponding interfaces. This eliminates the need to search for scattered interfaces throughout the platform, significantly reducing interface connection time and improving operational efficiency.

[0021] As a preferred implementation of a test platform for testing the performance of unloading valves, it includes a data analysis bracket, on the top of which is a PLC controller and a human-machine interface. The PLC controller is electrically connected to pressure sensor one, pressure sensor two, proportional valve one, and proportional valve two, and the PLC controller is electrically connected to the human-machine interface.

[0022] With the above-described structure, the PLC controller is electrically connected to pressure sensor 1 and pressure sensor 2, enabling real-time acquisition of pressure data from the high-pressure and low-pressure oil inlet pipelines. Simultaneously, the PLC controller is electrically connected to proportional valve 1 and proportional valve 2, automatically adjusting their opening based on preset test programs or real-time data from pressure sensors 1 and 2. This controls the output pressure of pneumatic oil pumps 1 and 2, avoiding errors caused by manual adjustment of the proportional valves, improving the response speed and accuracy of pressure regulation, and solving the problems of slow pressure regulation response and large overshoot in existing systems. The PLC controller is also electrically connected to a human-machine interface (HMI), displaying the pressure data acquired by pressure sensors 1 and 2, as well as the operating status of proportional valves 1 and 2, in real-time. Operators can intuitively monitor the testing process. Furthermore, the HMI supports the input and modification of test parameters (such as target high-pressure and target low-pressure values) and can store test data for subsequent data analysis and traceability, improving the intelligence of the testing process and data management efficiency.

[0023] As a preferred implementation of a test platform for testing the performance of unloading valves, the system includes a hydraulic support, a pneumatic oil pump I, a pressure sensor I, a pneumatic oil pump II, a pressure sensor II, an air receiver, an air filling pipeline, a pressurization pipeline, a proportional valve I, a proportional valve II, and a pneumatic pressure test switching valve, all of which are mounted on the hydraulic support.

[0024] The above structural design integrates core hydraulic components such as pneumatic oil pump 1, pressure sensor 1, pneumatic oil pump 2, pressure sensor 2, air receiver, air charging pipeline, booster pipeline, proportional valve 1, proportional valve 2, and air pressure test switching valve into a centralized installation on the hydraulic support. This avoids the problems of messy pipelines and large space occupation caused by the dispersed arrangement of components, making the entire hydraulic system layout neat, reducing pipeline connection length, and lowering the risk of oil pressure loss and leakage. At the same time, the integrated installation facilitates operators to quickly locate faulty components (such as directly locating and repairing a faulty pressure sensor on the hydraulic support), improving maintenance efficiency. If the test platform needs to be moved, the core hydraulic components can be moved as a whole by moving the hydraulic support, reducing the difficulty of transportation.

[0025] A preferred implementation of a test platform for testing the performance of an unloading valve includes an oil tank bracket, with an oil reservoir mounted on the oil tank bracket.

[0026] With the above structural design, the oil tank stores a large amount of oil and is quite heavy. The tank support provides stable support for the tank, preventing it from tipping over due to its own weight or external impacts, thus avoiding oil leakage and potential safety accidents. Furthermore, by designing the height of the tank support, the connection height of the oil outlet to the high-pressure and low-pressure inlet pipelines can be matched, as can the connection height of the oil return port to the return pipeline. This reduces resistance to oil flow in the pipelines, ensuring smooth operation of the closed-loop oil circuit and preventing oil circuit blockage or insufficient oil supply caused by unreasonable height differences. In addition, the reasonable height design also allows operators to easily observe the oil level through the tank's level gauge or to add oil by opening the filler port.

[0027] The beneficial effects of this utility model include:

[0028] 1. During operation, the air receiver supplies air to the pneumatic oil pump 1 through air supply line 1. The proportional valve 1 on air supply line 1 can independently adjust the output pressure of the pneumatic oil pump 1, thereby controlling the oil pressure in the high-pressure side inlet oil line. Similarly, the air receiver supplies air to the pneumatic oil pump 2 through air supply line 2. The proportional valve 2 can independently adjust the oil pressure in the low-pressure side inlet oil line. This can simulate the local oil circuit pressure fluctuations in the actual operation of the unloading valve. The pressure regulation response is fast, the overshoot is small, and the test data has a small deviation from the actual working conditions.

[0029] 2. The oil reservoir is connected to the unloading port of the unloading valve under test through the return oil pipeline. During the test, the oil discharged by the unloading valve can flow back to the oil reservoir through the return oil pipeline to avoid oil waste and ensure that the test process can be carried out continuously and stably without the need for frequent oil replenishment. Attached Figure Description

[0030] To more clearly illustrate the technical solution of this utility model, the drawings used in the description 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.

[0031] Figure 1 This is a schematic diagram illustrating the principle structure of a specific embodiment of the present utility model;

[0032] Figure 2 This is a schematic diagram of the structure of the hydraulic support and the oil tank support in a specific embodiment of this utility model;

[0033] Figure 3 This is a schematic diagram of the test bracket in a specific embodiment of the present invention;

[0034] Figure 4 This is a schematic diagram of the data analysis bracket in a specific embodiment of the present invention.

[0035] List of components and reference numerals:

[0036] 1. Oil reservoir; 2. High-pressure side oil inlet pipeline; 3. Low-pressure side oil inlet pipeline; 4. High-pressure side interface; 5. Unloading valve to be tested; 6. High-pressure side oil port; 7. Low-pressure side interface; 8. Low-pressure side oil port; 9. Pneumatic oil pump one; 10. Pressure sensor one; 11. Pneumatic oil pump two; 12. Pressure sensor two; 13. Air supply pipeline one; 14. Air receiver; 15. Proportional valve one; 16. Air charging pipeline; 17. Booster pipeline; 18. Air supply pipeline two; 19. Proportional valve two; 20. Return oil pipeline; 21. Return oil interface; 22. Unloading port; 23. Oil mist separator one; 24. 25. Oil mist separator II; 26. Safety valve assembly I; 27. Water droplet separator I; 28. Water droplet separator II; 29. ​​Booster; 30. Check valve; 31. Circulating filter pipeline; 32. Motor pump assembly; 33. Safety valve assembly II; 34. Circulating filter; 35. Air inlet pipeline; 36. Air pressure test switching valve; 37. Air inlet; 38. Test bracket; 39. Data analysis bracket; 40. PLC controller; 41. Human-machine interface; 42. Hydraulic support; 43. Oil tank bracket; 44. Protective cover; 45. Level gauge; 46. Temperature sensor. Detailed Implementation

[0037] To make the objectives, features, and advantages of this utility model more apparent and understandable, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this utility model, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0038] Reference Figure 1-4 This embodiment proposes a test platform for testing the performance of an unloading valve, including an oil reservoir 1. The oil reservoir 1 is connected to a high-pressure side oil inlet pipe 2 and a low-pressure side oil inlet pipe 3. The high-pressure side oil inlet pipe 2 is provided with a high-pressure side interface 4 at the end away from the oil reservoir 1. The high-pressure side interface 4 is used to connect to the high-pressure side oil port 6 of the unloading valve 5 to be tested. The low-pressure side oil inlet pipe 3 is provided with a low-pressure side interface 7 at the end away from the oil reservoir 1. The low-pressure side interface 7 is used to connect to the low-pressure side oil port 8 of the unloading valve 5 to be tested.

[0039] A pneumatic oil pump 9 and a pressure sensor 10 are installed on the high-pressure side oil inlet line 2. The pressure sensor 10 is located between the pneumatic oil pump 9 and the high-pressure side interface 4. The pneumatic oil pump 9 is connected to the air supply line 13, the other end of which is connected to the air receiver 14. A proportional valve 15 is installed on the air supply line 13. An oil mist separator 23 is also installed on the air supply line 13, located between the air receiver 14 and the proportional valve 15. The oil mist separator 23 is used to supply lubricating oil to the pneumatic oil pump 9.

[0040] A pneumatic oil pump 21 and a pressure sensor 22 are installed on the low-pressure side oil inlet line 3. The pressure sensor 212 is located between the pneumatic oil pump 21 and the low-pressure side interface 7. The pneumatic oil pump 21 is connected to the air supply line 28, the other end of which is connected to the air receiver 14. A proportional valve 29 is installed on the air supply line 28. An oil mist separator 24 is also installed on the air supply line 28, located between the air receiver 14 and the proportional valve 29. The oil mist separator 24 is used to supply lubricating oil to the pneumatic oil pump 21. The second air supply line 18 is connected to the second proportional valve 19 and the second pneumatic oil pump 11 by an air inlet line 34. The air inlet line 34 is equipped with a pressure test switching valve 35. The end of the air inlet line 34 away from the second proportional valve 19 is equipped with an air inlet interface 36, which is used to connect to the air inlet 37 of the unloading valve 5 to be tested.

[0041] Safety valve assembly 25 is also provided on the low-pressure side oil inlet pipeline 3. Safety valve assembly 25 is located between pressure sensor 12 and low-pressure side interface 7.

[0042] The air receiver 14 is also connected to the inflation line 16 and the pressurization line 17. The inflation line 16 is equipped with a water droplet separator 26. The pressurization line 17 is equipped with a water droplet separator 27, a pressurizer 28 and a one-way valve 29 in sequence from far to near the air receiver 14.

[0043] The oil storage tank 1 is also connected to the return oil pipeline 20. The end of the return oil pipeline 20 away from the oil storage tank 1 is provided with a return oil interface 21, which is used to connect to the oil discharge port 22 of the unloading valve 5 to be tested. The oil storage tank 1 is connected to both ends of the circulation filter pipeline 30. The circulation filter pipeline 30 is provided with a motor pump assembly 31, a second safety valve assembly 32, and a circulation filter 33. The second safety valve assembly 32 is located between the motor pump assembly 31 and the circulation filter 33. The motor pump assembly 31 is used to draw oil from the oil storage tank 1.

[0044] This embodiment includes a test bracket 38, a data analysis bracket 39, a hydraulic bracket 42, and an oil tank bracket 43. The test bracket 38 is used to place the unloading valve 5 to be tested. The high-pressure side interface 4, the low-pressure side interface 7, the air inlet interface 36, and the oil return interface 21 are all located on the test bracket 38. A PLC controller 40 and a human-machine interface 41 are mounted on the top of the data analysis bracket 39. The PLC controller 40 is electrically connected to pressure sensor 10, pressure sensor 12, proportional valve 15, and proportional valve 19, and the PLC controller 40 is electrically connected to the human-machine interface 41. Pneumatic oil pump 9, pressure sensor 10, pneumatic oil pump 11, pressure sensor 12, air receiver 14, air charging line 16, pressurization line 17, proportional valve 15, proportional valve 19, and air pressure test switching valve 35 are all located on the hydraulic bracket 42. The oil tank 1 is located on the oil tank bracket 43.

[0045] In this embodiment, the test bracket 38 is also equipped with a protective cover 44 to cover the unloading valve 5 under test. The protective cover can be equipped with an electrical interlock. During the test, oil leakage may occur at the connection points between the unloading valve 5 under test and the high-pressure side interface 4, low-pressure side interface 7, air inlet interface 36, and oil return interface 21 due to poor sealing. In addition, the protective cover 44 can isolate dust and impurities in the external environment, preventing them from adhering to the interface or valve core of the unloading valve 5 under test, and preventing impurities from affecting the normal operation of the unloading valve and the test results. At the same time, it can prevent operators from accidentally touching the unloading valve under test, reduce the displacement of the unloading valve or loosening of the interface caused by external contact, and ensure the stability of the test process.

[0046] The oil storage tank 1 is also equipped with a level gauge 45 and a temperature sensor 46. The level gauge 45 in the oil storage tank 1 can visually display the real-time level of the oil in the tank. During the test, if the oil level drops below the lower threshold due to evaporation or leakage (small amount), the operator can promptly detect this through the level gauge 45 and replenish the oil, preventing the pneumatic oil pumps 9 and 11 from running dry due to insufficient oil intake, and preventing overheating and damage to the pumps. When adding oil to the oil storage tank 1, the level gauge 45 can remind the operator to avoid overfilling and overflow, reducing oil waste and preventing spilled oil from causing short circuits in electrical components, slipping on the ground, and other safety issues, thus improving the operational convenience and safety of the test platform. The temperature sensor 46 can monitor the oil temperature in real time, preventing abnormal oil temperature from affecting test accuracy and facilitating timely detection of temperature anomalies by the operator. When the oil temperature is too high, the PLC controller 40 will issue a warning through an indicator, and the test platform will stop working.

[0047] In this embodiment, a solenoid valve and a pressure relay are installed on the air supply line 13. The solenoid valve is used to control the on / off state of the air supply line 13. A pressure relay is installed on the high-pressure side oil inlet line 2, and the pressure relay is located between the pneumatic oil pump 9 and the pressure sensor 10. A solenoid valve and a pressure relay are installed on the air supply line 18. The solenoid valve is used to control the on / off state of the air supply from the pneumatic oil pump 11, and does not affect the on / off state of the air inlet line 34. The pressure relay is located between the solenoid valve and the pneumatic oil pump 11. A pressure relay is installed on the low-pressure side oil inlet line 3, and the pressure relay is located between the safety valve assembly 25 and the low-pressure side interface 7. A pressure relay is installed on the air inlet line 34, and the pressure relay is located between the air pressure test switching valve 35 and the air inlet interface 36.

[0048] Reference Figure 1 , Figure 1 The downward-extending pipelines of safety valve group 1 (25) and safety valve group 2 (32), which are not connected to other structures, are pressure relief pipelines. The pressure relief medium is oil. The pressure relief pipelines can lead to a safe discharge point or oil storage tank 1. When the pressure relief pipeline leads to oil storage tank 1, oil can be returned. When the pressure relief pipeline leads to oil storage tank 1, a pressure reducing device, such as a secondary pressure relief valve or a throttle valve, can be installed on the pressure relief pipeline to prevent overpressure in oil storage tank 1. When the pressure relief pipeline leads to oil storage tank 1, there may still be gas in the pressure relief pipeline. Therefore, a buffer tank that can achieve gas-liquid separation can also be installed on the pressure relief pipeline. The gas is discharged into the atmosphere through the breather valve of the buffer tank (which must meet environmental protection requirements), and the oil is transported to oil storage tank 1 through an overflow pipe or pump.

[0049] Work process:

[0050] Place the unloading valve 5 to be tested on the test bracket 38. Connect the high-pressure side oil port 6 of the unloading valve 5 to the high-pressure side interface 4 on the test bracket 38, the low-pressure side oil port 8 of the unloading valve 5 to the low-pressure side interface 7 on the test bracket 38, the air inlet 37 of the unloading valve 5 to the air inlet 36 on the test bracket 38, and the oil discharge port 22 of the unloading valve 5 to the oil return interface 21 on the test bracket 38. After the connection is completed, cover the unloading valve 5 with the protective cover 44 on the test bracket 38. If the protective cover 44 is equipped with an electric interlock, ensure that the interlock function is properly activated. Input the preset test parameters (such as the target pressure value on the high-pressure side, the target pressure value on the low-pressure side, and the target pressure value for air pressure testing) through the human-machine interface 41.

[0051] Start the motor pump 31 on the circulating filter pipeline 30. The motor pump 31 draws oil from the oil storage tank 1. The oil flows sequentially through the second safety valve group 32 (if the pressure in the circulating filter pipeline 30 is overloaded, the second safety valve group 32 will automatically open to release pressure and protect the motor pump 31 and the pipeline) and the circulating filter 33. The circulating filter 33 filters out impurities such as metal debris and dust in the oil. The filtered clean oil flows back to the oil storage tank 1, forming an oil circulation filtration loop to continuously purify the oil in the oil storage tank 1 until the oil cleanliness meets the test requirements. It can be decided whether to shut down the motor pump 31 according to the test requirements (if the test process requires continuous oil cleanliness, the motor pump 31 can be kept running).

[0052] Open the inflation line 16. External compressed air passes through the water droplet separator 26 on the inflation line 16 to remove liquid moisture before entering the air receiver 14. Observe the pressure inside the air receiver 14 using the pressure monitoring component (such as a pressure gauge). When the pressure reaches the initial preset value, the inflation line 16 can be closed. If the pressure inside the air receiver 14 does not reach the required test pressure, open the booster line 17. External compressed air first passes through the water droplet separator 27 to remove liquid moisture before entering the booster 28 for pressurization. The pressurized compressed air then enters the air receiver 14 through the one-way valve 29. Continuously monitor the pressure inside the air receiver 14 until the stable pressure value required for the test is reached, then close the booster line 17.

[0053] When conducting high-pressure side hydraulic performance testing, the solenoid valve 1 on the air supply line 13 is opened, and the compressed air in the air receiver 14 is delivered through the air supply line 13, first flowing through the oil mist separator 23, and then entering the proportional valve 15. Control commands are sent via the human-machine interface 41 on the data analysis bracket 39. After receiving the commands, the PLC controller 40 adjusts the opening of the proportional valve 15, thereby controlling the pressure of the compressed air entering the pneumatic oil pump 9. The pneumatic oil pump 9 starts under the drive of compressed air, draws clean oil from the oil tank 1, pressurizes the oil, and delivers it to the high-pressure side oil inlet pipe 2. The oil pressure in the high-pressure side oil inlet pipe 2 is monitored in real time by the pressure sensor 10, which transmits the pressure data to the PLC controller 40. The PLC controller 40 displays the data in real time on the human-machine interface 41. The operator can observe the pressure changes through the human-machine interface 41. If the pressure does not reach the preset target value, the PLC controller 40 can further fine-tune the opening of the proportional valve 15, or the operator can manually adjust the proportional valve 15 through the human-machine interface 41 until the pressure in the high-pressure side oil inlet pipe 2 stabilizes at the target pressure value (e.g., when simulating "suppressing instantaneous pulse high pressure", the proportional valve 15 is quickly adjusted to make the pressure rise to the pulse high pressure value in a short time). The oil in the high-pressure side inlet pipe 2 enters the high-pressure side port 6 of the unloading valve 5 under test through the high-pressure side interface 4. The unloading valve 5 under test operates under the action of high-pressure oil. The oil discharged from the unloading valve enters the return oil pipe 20 through the unloading port 22 and the return oil interface 21, and finally flows back to the oil storage tank 1. During this process, the pressure change of the high-pressure side inlet pipe 2 is continuously monitored by the pressure sensor 10, and the performance parameters such as the pressure response speed and unloading pressure stability of the unloading valve 5 under high-pressure conditions are recorded. The data is stored by the PLC controller 40 for subsequent analysis.

[0054] If the pressure in the high-pressure side oil inlet pipeline 2 becomes abnormal due to a malfunction of the pneumatic oil pump 9 or a loss of control of the proportional valve 15, the pressure relay 2 on the high-pressure side oil inlet pipeline 2 will detect the abnormal pressure signal and transmit the signal to the PLC controller 40. The PLC controller 40 can issue an alarm signal and control the solenoid valve 1 to close according to the preset program, cut off the air supply to the air supply pipeline 13, and stop the operation of the pneumatic oil pump 9 to prevent equipment damage and test accidents.

[0055] During the low-pressure side hydraulic performance test, the solenoid valve 2 on the air supply line 2 18 is opened. Compressed air in the air receiver 14 is delivered through the air supply line 2 18, first flowing through the oil mist separator 2 24, and then entering the proportional valve 2 19. Control commands are sent through the human-machine interface 41, and the PLC controller 40 adjusts the opening of the proportional valve 2 19 to control the pressure of the compressed air entering the pneumatic oil pump 2 11. After the pneumatic oil pump 2 11 starts, it draws oil from the oil storage tank 1, pressurizes it, and delivers it to the low-pressure side oil inlet line 3. The oil pressure in the low-pressure side oil inlet line 3 is monitored in real time by the pressure sensor 2 12, and the pressure data is transmitted to the human-machine interface 41 for display via the PLC controller 40. The operator or the PLC controller 40 adjusts the proportional valve 2 19 to stabilize the pressure in the low-pressure side oil inlet line 3 at the preset target pressure value (e.g., when simulating "rapid downward low pressure", the pressure is adjusted to the low-pressure stable value). The oil in the low-pressure side inlet pipe 3 enters the low-pressure side port 8 of the unloading valve 5 under test through the low-pressure side interface 7. The unloading valve 5 under test operates under the action of low-pressure oil. The oil discharged from the unloading valve flows back to the oil storage tank 1 through the return oil interface 21 and the return oil pipe 20. The pressure sensor 12 continuously monitors the pressure change of the low-pressure side inlet pipe 3 and records the performance parameters of the unloading valve 5 under low-pressure conditions. The data is stored by the PLC controller 40.

[0056] If the pressure in the low-pressure side oil inlet pipe 3 exceeds the safety threshold, the safety valve group 25 on the low-pressure side oil inlet pipe 3 will automatically open to release pressure and reduce the pressure to a safe range. At the same time, the pressure relay 4 on the low-pressure side oil inlet pipe 3 will detect the abnormal pressure signal and transmit it to the PLC controller 40. The PLC controller 40 will issue an alarm signal and control the solenoid valve 2 to close, cutting off the air supply to the pneumatic oil pump 11 and stopping its operation. If the pressure relay 3 on the air supply pipe 18 detects an abnormal compressed air pressure entering the pneumatic oil pump 11, it will also transmit the signal to the PLC controller 40 to trigger the corresponding protection action.

[0057] During the air pressure performance test, compressed air in the air receiver 14 is delivered to the intake pipe 34 via the second air supply pipe 18 (the opening of the second proportional valve 19 can be adjusted according to the test requirements to control the air pressure). After passing through the air pressure test switching valve 35, the compressed air pressure is monitored in real time by the pressure relay 5 (the pressure relay 5 transmits the air pressure data to the PLC controller 40, which is displayed on the human-machine interface 41). If the air pressure does not reach the target value, it can be adjusted by adjusting the opening of the second proportional valve 19 until the air pressure in the intake pipe 34 stabilizes at the preset air pressure test value. The compressed air in the intake pipe 34 enters the air inlet 37 of the unloading valve 5 under test through the air inlet 36. The unloading valve 5 under test operates under air pressure. During this process, the pressure relay 5 continuously monitors the air pressure changes in the intake pipe 34 and records parameters such as the action response speed and sealing performance of the unloading valve 5 under different air pressures. The data is stored by the PLC controller 40.

[0058] If the air pressure in the intake pipe 34 is abnormal (too high or too low), the pressure relay 5 will transmit a signal to the PLC controller 40. The PLC controller 40 will issue an alarm signal and can control the air pressure test switching valve 35 to close, cut off the air pressure supply, and stop the test.

[0059] High-pressure side hydraulic performance testing, low-pressure side hydraulic performance testing, and pneumatic performance testing can be performed independently or simultaneously. After the tests are completed, the test data stored in the PLC controller 40 is exported through the human-machine interface 41 on the data analysis bracket 39 for unloading valve performance analysis. This allows for determination of whether the unloading valve 5 under test meets the performance requirements. The methods and approaches for performance analysis are well-known to those skilled in the art. This embodiment focuses on the structure of the test platform, therefore, the method for analyzing the unloading valve performance will not be described in detail.

[0060] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A test platform for testing the performance of an unloading valve, comprising an oil reservoir (1), characterized in that, The oil reservoir (1) is connected to the high-pressure side oil inlet pipeline (2) and the low-pressure side oil inlet pipeline (3) respectively. The high-pressure side oil inlet pipeline (2) is provided with a high-pressure side interface (4) at the end away from the oil reservoir (1). The high-pressure side interface (4) is used to connect to the high-pressure side oil port (6) of the unloading valve (5) to be tested. The low-pressure side oil inlet pipeline (3) is provided with a low-pressure side interface (7) at the end away from the oil reservoir (1). The low-pressure side interface (7) is used to connect to the low-pressure side oil port (8) of the unloading valve (5) to be tested. A pneumatic oil pump (9) and a pressure sensor (10) are installed on the high-pressure side oil inlet pipeline (2). The pressure sensor (10) is located between the pneumatic oil pump (9) and the high-pressure side interface (4). A pneumatic oil pump (11) and a pressure sensor (12) are installed on the low-pressure side oil inlet pipeline (3). The pressure sensor (12) is located between the pneumatic oil pump (11) and the low-pressure side interface (7). Pneumatic oil pump 1 (9) is connected to air supply line 1 (13), and the other end of air supply line 1 (13) is connected to air receiver (14). Proportional valve 1 (15) is provided on air supply line 1 (13). Air receiver (14) is also connected to air charging line (16) and pressurization line (17). Pneumatic oil pump 2 (11) is connected to air supply line 2 (18), and the other end of air supply line 2 (18) is connected to air receiver (14). Proportional valve 2 (19) is provided on air supply line 2 (18). The oil storage tank (1) is also connected to the return oil pipeline (20). The end of the return oil pipeline (20) away from the oil storage tank (1) is provided with a return oil interface (21). The return oil interface (21) is used to connect to the unloading port (22) of the unloading valve (5) to be tested.

2. The test platform for performance testing of an unloading valve according to claim 1, characterized in that, An oil mist separator (23) is also provided on the air supply line (13). The oil mist separator (23) is located between the air receiver (14) and the proportional valve (15). The oil mist separator (23) is used to supply lubricating oil to the pneumatic oil pump (9). And / or, an oil mist separator (24) is also provided on the second air supply line (18). The second oil mist separator (24) is located between the air receiver (14) and the proportional valve (19). The second oil mist separator (24) is used to supply lubricating oil to the second pneumatic oil pump (11).

3. The test platform for performance testing of an unloading valve according to claim 1, characterized in that, Safety valve assembly 1 (25) is provided on the low-pressure side oil inlet pipeline (3), and safety valve assembly 1 (25) is located between pressure sensor 2 (12) and low-pressure side interface (7).

4. The test platform for performance testing of an unloading valve according to claim 1, characterized in that, Water droplet separator 1 (26) is provided on the air filling pipeline (16), and water droplet separator 2 (27), pressure booster (28) and one-way valve (29) are provided on the pressurizing pipeline (17) from far to near the air bag (14).

5. The test platform for performance testing of an unloading valve according to claim 1, characterized in that, The oil storage tank (1) is connected to both ends of the circulating filter pipeline (30). The circulating filter pipeline (30) is equipped with a motor pump group (31), a second safety valve group (32) and a circulating filter (33). The second safety valve group (32) is located between the motor pump group (31) and the circulating filter (33). The motor pump group (31) is used to draw oil from the oil storage tank (1).

6. The test platform for performance testing of an unloading valve according to claim 1, characterized in that, The second air supply line (18) is connected to the second proportional valve (19) and the second pneumatic oil pump (11) by an air inlet line (34). The air inlet line (34) is equipped with a pressure test switching valve (35). The end of the air inlet line (34) away from the second proportional valve (19) is equipped with an air inlet port (36). The air inlet port (36) is used to connect to the air inlet (37) of the unloading valve (5) to be tested.

7. The test platform for performance testing of an unloading valve according to claim 1, characterized in that, The test bracket (38) is used to place the unloading valve (5) to be tested. The high-pressure side interface (4), low-pressure side interface (7), air inlet interface (36) and oil return interface (21) are all located on the test bracket (38).

8. The test platform for performance testing of an unloading valve according to claim 1, characterized in that, Includes a data analysis bracket (39), on the top of which is a PLC controller (40) and a human-machine interface (41). The PLC controller (40) is electrically connected to pressure sensor 1 (10), pressure sensor 2 (12), proportional valve 1 (15) and proportional valve 2 (19), and the PLC controller (40) is electrically connected to the human-machine interface (41).

9. A test platform for testing the performance of an unloading valve according to claim 1, characterized in that, The hydraulic support (42), pneumatic oil pump 1 (9), pressure sensor 1 (10), pneumatic oil pump 2 (11), pressure sensor 2 (12), air bag (14), air charging line (16), pressurization line (17), proportional valve 1 (15), proportional valve 2 (19) and air pressure test switching valve (35) are all installed on the hydraulic support (42).

10. The test platform for performance testing of an unloading valve according to claim 1, characterized in that, Includes a fuel tank bracket (43), and a fuel storage tank (1) is mounted on the fuel tank bracket (43).

Images