Performance test system of hydraulic control valve

Abstract

The utility model relates to the technical field of test systems, and provides a performance test system of a hydraulic control valve, which comprises a bearing device, a main system and a pilot system, the main system comprises a main oil way and a first overflow oil way, one end of the main oil way is connected with an oil tank, and the other end of the main oil way is provided with a first quick-plug module; the first quick insertion module is connected with a tested hydraulic control valve; the main oil way is used for controlling the pressure of the performance testing system; the first overflow oil way is connected to the main oil way and used for adjusting and maintaining the pressure of the main oil way. The pilot system comprises a pilot oil way and a second overflow oil way, one end of the pilot oil way is connected with the oil tank, the other end of the pilot oil way is provided with a second quick-insertion module, and the second quick-insertion module is connected with the tested hydraulic control valve; the pilot oil way is used for controlling the pressure of the performance testing system; the second overflow oil way is connected to the pilot oil way and used for adjusting and maintaining the pressure of the pilot oil way. According to the utility model, the performance of the tested hydraulic control valve under different working conditions can be tested.

Description

Technical Field

[0001] This utility model relates to the field of testing system technology, and in particular to a performance testing system for hydraulic control valves. Background Technology

[0002] In the relevant technical field, the research and testing of hydraulic control valves faces significant limitations. Current testing methods focus only on testing certain performance parameters of the hydraulic control valve itself. However, performance evaluation of hydraulic control valves in practical applications relies not only on testing their individual performance parameters but also on parameter calibration.

[0003] When hydraulic control valves are integrated into a hydraulic system assembly, the operating logic and interrelationships of the entire system change. The performance parameters of the hydraulic control valve itself cannot represent its performance in the integrated environment. If the hydraulic control valve lacks overall performance testing data, it is difficult to fully assess the actual working capacity of the hydraulic system including the hydraulic control valve, making it impossible to estimate the efficiency of the hydraulic control valve in actual operation, thereby affecting the operation of the entire hydraulic system. Utility Model Content

[0004] This invention provides a performance testing system for hydraulic control valves to address the problem in the existing technology that the performance testing of hydraulic control valves is insufficient, making it impossible to fully grasp the various performance indicators of the product, thus directly affecting the overall performance of the product.

[0005] This utility model provides a performance testing system for hydraulic control valves, including:

[0006] A support device suitable for supporting the hydraulic control valve under test;

[0007] The main system includes:

[0008] The main oil circuit has one end connected to the oil tank and the other end equipped with a first quick-connect module, which is connected to the hydraulic control valve under test. The main oil circuit is used to control the pressure of the performance testing system under the corresponding test function.

[0009] The first overflow oil passage is connected to the main oil passage and is used to regulate and maintain the pressure of the main oil passage;

[0010] The pilot system includes:

[0011] A pilot oil circuit is provided, one end of which is connected to an oil tank, and the other end of which is provided with a second quick-connect module, which is connected to the hydraulic control valve under test; the pilot oil circuit is used to control the pressure of the performance testing system under the corresponding test function;

[0012] The second overflow oil passage is connected to the pilot oil passage and is used to regulate and maintain the pressure of the pilot oil passage.

[0013] According to the performance testing system for the hydraulic control valve provided by this utility model, the main oil circuit is equipped with:

[0014] Oil pump #1 has an oil inlet and an oil outlet, and the oil inlet of oil pump #1 is connected to the oil tank;

[0015] The eighth control valve has an A port, a B port, a P port and a T port, wherein the T port of the eighth control valve is connected to the return oil pipe at point F;

[0016] A flow sensor #1 is installed in the oil line between the oil outlet of the #1 oil pump and the P port of the eighth control valve to monitor the oil outlet flow of the #1 oil pump.

[0017] Pressure sensor #5 is located in the oil line between port A of the eighth control valve and the first quick-connect module 60, and is used to monitor the pressure value in the corresponding hydraulic oil line.

[0018] Pressure sensor #6 is located in the oil line between port B of the eighth control valve and the first quick-connect module 60, and is used to monitor the pressure value in the corresponding hydraulic oil line.

[0019] According to the performance testing system for the hydraulic control valve provided by this utility model, the main oil circuit is further equipped with:

[0020] The No. 1 throttle valve is located in the oil line between the oil outlet of the No. 1 oil pump and the No. 1 flow sensor, and is used to regulate the pressure oil flow rate in the corresponding oil line.

[0021] According to the performance testing system for the hydraulic control valve provided by this utility model, the main oil circuit is further equipped with:

[0022] The first check valve is located in the oil line between the No. 1 flow sensor and the P port of the eighth control valve to prevent the oil from flowing backward.

[0023] Pressure gauge #3 is installed in the oil line between the first check valve and the P port of the eighth control valve to display the oil line pressure before the P port of the eighth control valve.

[0024] According to the performance testing system for the hydraulic control valve provided by this utility model, the first overflow oil line is equipped with:

[0025] The No. 5 relief valve is connected in series on the return oil pipe at point G. It is used to allow the oil to flow back to the oil tank when the return oil pipe at point G reaches the set pressure of the No. 5 relief valve.

[0026] The second check valve, located on the return oil pipe at point G, is used to prevent the oil from flowing in the opposite direction.

[0027] The ninth control valve is self-locking with the #5 overflow valve and is used to control the pressure of the #5 overflow valve.

[0028] According to the performance testing system for the hydraulic control valve provided by this utility model, the pilot oil circuit is equipped with:

[0029] Oil pump #2 has an oil inlet and an oil outlet, and the oil inlet of oil pump #2 is connected to the oil tank;

[0030] The sixth control valve has an A port, a B port, a P port and a T port, and the T port of the sixth control valve is connected to the return oil pipe at point D.

[0031] The fourth control valve is located on the oil line between the A port of the sixth control valve and the second quick-connect module;

[0032] The fifth control valve is located on the oil line between the B port of the sixth control valve and the second quick-connect module; when there is a leak in the neutral position of the sixth control valve, the fourth control valve and the fifth control valve are used to isolate the pressure transmission to the second quick-connect module.

[0033] The No. 2 flow sensor is installed in the oil line between the oil outlet of the No. 2 oil pump and the P port of the sixth control valve to monitor the oil outlet flow of the No. 2 oil pump.

[0034] Pressure sensor #3 is located in the oil circuit between the fourth control valve and the second quick-connect module, and is used to monitor the pressure value in the corresponding hydraulic oil circuit;

[0035] Pressure sensor #4 is located in the oil circuit between the fifth control valve and the second quick-connect module, and is used to monitor the pressure value in the corresponding hydraulic circuit.

[0036] According to the performance testing system for the hydraulic control valve provided by this utility model, the pilot oil circuit is further provided with:

[0037] The throttle valve #2 is located in the oil line between the oil outlet of the #2 oil pump and the #2 flow sensor, and is used to regulate the pressure oil flow rate in the corresponding oil line.

[0038] According to the performance testing system for the hydraulic control valve provided by this utility model, the pilot oil circuit is further provided with:

[0039] The third check valve is located in the oil line between the No. 2 flow sensor and the P port of the sixth control valve to prevent the oil from flowing backward.

[0040] Pressure gauge #2 is installed in the oil line between the third check valve and the P port of the sixth control valve to display the oil line pressure before the P port of the sixth control valve.

[0041] According to the performance testing system for the hydraulic control valve provided by this utility model, the second overflow oil circuit is equipped with:

[0042] The No. 4 relief valve is connected in series on the return oil pipe at point E. It is used to allow the oil to flow back to the oil tank when the return oil pipe at point E reaches the set pressure of the No. 4 relief valve.

[0043] The fourth check valve, located on the return oil pipe at point E, is used to prevent oil from flowing in the opposite direction.

[0044] The seventh control valve is self-locking with the #4 overflow valve and is used to control the pressure of the #4 overflow valve.

[0045] According to the hydraulic control valve performance testing system provided by this utility model, oil filters are provided on the oil lines before the oil pumps in both the main oil line and the pilot oil line.

[0046] The hydraulic control valve performance testing system provided by this utility model, through the coordinated operation of the main system and the pilot system, can simulate various operating conditions of the tested hydraulic control valve under different working scenarios. This allows for accurate evaluation of the stability of the tested hydraulic control valve under different operating conditions, thereby improving the safety and reliability of the entire system. Comprehensive testing ensures that the performance of the tested hydraulic control valve meets requirements during production, avoiding poor overall system performance due to insufficient testing, reducing subsequent maintenance and troubleshooting costs, better meeting the needs of different users and application scenarios, and enhancing the product's competitiveness in the market.

[0047] Compared to existing testing systems that focus on the performance parameters of hydraulic control valves, the hydraulic control valve performance testing system provided in this embodiment of the invention can cover a wider range of tests. In addition to balance valves, it can also test hydraulic check valves (hydraulic locks) and stroke valves. Attached Figure Description

[0048] To more clearly illustrate the technical solutions in 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 some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0049] Figure 1 This is a schematic diagram of the performance testing system for the hydraulic control valve provided in this embodiment of the utility model.

[0050] Figure 2 This is a schematic diagram of the main system in the performance testing system for the hydraulic control valve provided in this embodiment of the utility model.

[0051] Figure 3 This is a schematic diagram of the pilot system in the performance testing system of the hydraulic control valve provided in this embodiment of the utility model.

[0052] Figure label:

[0053] 10. Main system; 20. Pilot system; 30. First check valve; 40. Second check valve; 50. Third check valve; 60. First quick-connect module; 70. Second quick-connect module; 80. Fourth check valve. Detailed Implementation

[0054] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0055] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" 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 the embodiments of this application based on the specific circumstances.

[0056] In the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0057] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the embodiments of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0058] Figure 1 This is a schematic diagram of the performance testing system for the hydraulic control valve provided in this embodiment of the utility model. Figure 2 This is a schematic diagram of the main system in the performance testing system for the hydraulic control valve provided in this embodiment of the utility model. Figure 3 This is a schematic diagram of the pilot system in the performance testing system of the hydraulic control valve provided in this embodiment of the utility model.

[0059] See Figures 1 to 3 This utility model embodiment provides a performance testing system for hydraulic control valves. This performance testing system can not only test the various performance characteristics of balance valves, but also perform performance tests on other hydraulic valves such as hydraulic check valves (hydraulic locks) and stroke valves. This utility model embodiment uses a balance valve as an example for explanation and illustration.

[0060] The performance testing system for the hydraulic control valve includes a load-bearing device, a main system 10, and a pilot system 20.

[0061] The support device adopts a high-strength steel structure frame, which has sufficient rigidity and strength to stably support the tested hydraulic control valve. The support device is equipped with adjustable clamps and positioning devices, which can install and fix hydraulic control valves of different specifications and models, ensuring good stability of the tested hydraulic control valve during the test.

[0062] The main system 10 includes a main oil circuit and a first overflow oil circuit. One end of the main oil circuit is connected to the oil tank, and the other end of the main oil circuit is equipped with a first quick-connect module 60. The first quick-connect module 60 is connected to the hydraulic control valve under test. The main oil circuit is used to control the pressure of the performance testing system under the corresponding test function. The first overflow oil circuit is connected to the main oil circuit and is used to regulate and maintain the pressure of the main oil circuit.

[0063] The pilot system 20 includes a pilot oil circuit and a second overflow oil circuit. One end of the pilot oil circuit is connected to the oil tank, and the other end of the pilot oil circuit is equipped with a second quick-connect module 70. The second quick-connect module 70 is connected to the hydraulic control valve under test. The pilot oil circuit is used to control the pressure of the performance testing system under the corresponding test function. The second overflow oil circuit is connected to the pilot oil circuit and is used to regulate and maintain the pressure of the pilot oil circuit.

[0064] Both the first quick-connect module 60 and the second quick-connect module 70 adopt a standardized design, enabling rapid insertion and removal, and achieving reliable sealing. Each module includes multiple quick-connect connectors, which can be two, three, four, or even more, depending on the number of test subjects. Different quick-connect connectors in the first quick-connect module 60 can be connected to different ports of the tested hydraulic control valve, thereby enabling oil supply and signal acquisition for different oil circuits of the tested hydraulic control valve. The second quick-connect module 70 works in conjunction with the first quick-connect module 60 to provide complete control signals and oil supply to the tested hydraulic control valve.

[0065] The hydraulic control valve performance testing system provided by this utility model involves mounting the hydraulic control valve under test on a support device and securing it firmly using clamps and positioning devices. Based on the type of hydraulic control valve under test and the testing requirements, appropriate first quick-release modules 60 and second quick-release modules 70 are selected, connecting the main system 10 and pilot system 20 to the hydraulic control valve under test. Then, according to the testing requirements, the system controls the actions of the corresponding control valves in the main system 10 and pilot system 20, thereby completing multiple performance tests of the hydraulic control valve under test.

[0066] It is understood that the hydraulic control valve performance testing system provided in this embodiment of the invention, through the coordinated operation of the main system 10 and the pilot system 20, can simulate various working conditions of the tested hydraulic control valve under different working scenarios, thereby accurately evaluating the stability of the tested hydraulic control valve under different working conditions, and improving the safety and reliability of the entire system. Through complete testing, it ensures that the performance of the tested hydraulic control valve meets the requirements during production, avoiding poor overall system performance due to insufficient testing, reducing the cost of later maintenance and troubleshooting, better meeting the needs of different users and application scenarios, and enhancing the product's competitiveness in the market.

[0067] Compared to existing testing systems that focus on the performance parameters of hydraulic control valves, the hydraulic control valve performance testing system provided in this embodiment of the invention can cover a wider range of tests. In addition to balance valves, it can also test hydraulic check valves (hydraulic locks) and stroke valves.

[0068] Furthermore, by connecting the first quick-connect module 60 and the second quick-connect module 70, the performance testing system and the hydraulic control valve under test can be quickly installed and removed. This setup not only improves testing efficiency but also facilitates the replacement of different hydraulic control valves under test, thus meeting diverse testing tasks.

[0069] Continue reading Figure 1 and Figure 2 In some embodiments of this utility model, the main oil circuit is equipped with an oil pump #1, an eighth control valve (corresponding to valve ⑧ in the attached figure), a flow sensor #1, a pressure sensor #5, and a pressure sensor #6.

[0070] The eighth control valve (valve ⑧) can be a three-position four-way manual directional valve for easy manual operation. When the test system requires automatic control, the eighth control valve can be replaced by a solenoid directional valve. The eighth control valve has ports A, B, P, and T. Port T connects to a transparent return oil pipe, and the end of the return oil pipe forms point F for testing.

[0071] Pump #1 is connected to the oil tank and is used to pump pressurized oil in the main oil circuit. Pump #1 has an inlet and an outlet. The inlet of pump #1 is connected to the oil tank via an oil pipe, and the outlet of pump #1 is connected to the P port of the eighth control valve via an oil pipe. A plunger pump can be selected for pump #1. Plunger pumps are characterized by high flow rate, high pressure, and high efficiency, which can meet the different pressure and flow rate requirements during testing. In other words, pump #1 is used to provide adjustable low-pressure, high-flow-rate oil for the entire testing system.

[0072] The No. 1 flow sensor is located in the oil line between the No. 1 oil pump and the P port of the eighth control valve. The No. 1 flow sensor is used to monitor the flow rate at the outlet of the No. 1 oil pump and provide flow data for the test system.

[0073] Pressure sensor #5 is located in the oil line between port A of the eighth control valve and a quick-connect connector in the first quick-connect module 60. Pressure sensor #5 is used to monitor the pressure value in the corresponding hydraulic oil line.

[0074] Pressure sensor #6 is located in the oil line between port B of the eighth control valve and another quick-connect connector in the first quick-connect module 60. Pressure sensor #6 is used to monitor the pressure value in the corresponding hydraulic oil line.

[0075] Continue reading Figure 1 and Figure 2 In some embodiments of this utility model, a No. 1 throttle valve is also provided on the main oil circuit. The No. 1 throttle valve is located on the oil circuit between the oil outlet of the No. 1 oil pump and the No. 1 flow sensor. The No. 1 throttle valve controls the flow rate of the pressure oil by changing the throttle cross section or throttle length, thereby keeping the flow rate in the corresponding hydraulic oil circuit stable.

[0076] Continue reading Figure 1 and Figure 2 In some embodiments of this utility model, a pressure gauge #3 and a first check valve 30 are also provided on the main oil line. The pressure gauge #3 and the first check valve 30 are sequentially arranged on the oil line between the flow sensor #1 and the P port of the eighth control valve.

[0077] Pressure gauge #3 displays the pressure applied up to port P of control valve #8. Check valve #30 prevents backflow of oil. This prevents oil from flowing back into pump #1 and damaging it should the system pressure suddenly increase.

[0078] Continue reading Figure 1 and Figure 2 In some embodiments of this utility model, the first overflow oil line is provided with a 5# overflow valve, a second one-way valve 40 and a ninth control valve (corresponding to valve ⑨ in the attached figure).

[0079] The #5 relief valve is used to allow oil to flow back to the oil tank when the return oil pipe at point G reaches its set pressure, ensuring that the inlet pressure of the #5 relief valve, i.e., the outlet pressure of the #1 oil pump, remains constant. When the outlet oil pressure from the #1 oil pump exceeds the set pressure of the #5 relief valve, overflow oil flows back to the oil tank through the connection at point G, simultaneously ensuring that the outlet pressure of the #1 oil pump remains stable.

[0080] Among them, the direct-acting relief valve of the 5# relief valve is connected in series on the return oil pipe at point G, and the remote control port of the pilot-operated relief valve of the 5# relief valve is connected to the oil inlet of the direct-acting relief valve, so that the pilot-operated relief valve (i.e., remote pressure regulating valve) can be used for remote pressure regulation.

[0081] The ninth control valve (valve ⑨) is self-locking with the 5# relief valve. The ninth control valve (valve ⑨) can be a two-position two-way solenoid valve. The ninth control valve is used to control the establishment of the working pressure of the 1# oil pump and the unloading in the shutdown state.

[0082] The second check valve 40 is located on the return oil pipe at point G to prevent oil from flowing in the opposite direction.

[0083] Continue reading Figure 1 and Figure 3 In some embodiments of this utility model, the pilot oil circuit is equipped with a No. 2 oil pump, a sixth control valve (corresponding to valve ⑥ in the attached drawing), a fourth control valve (corresponding to valve ④ in the attached drawing), a fifth control valve (corresponding to valve ⑤ in the attached drawing), a No. 2 flow sensor, a No. 3 pressure sensor, and a No. 4 pressure sensor.

[0084] The sixth control valve (valve ⑥) can be a three-position four-way O-type solenoid valve. The sixth control valve is used to control the forward conduction function of the tested hydraulic control valve from port 2 (valve port) to port 1 (load port). When the tested hydraulic control valve is conducting forward, the sixth control valve operates in the left position. When the tested hydraulic control valve needs to conduct reverse, the sixth control valve operates in the right position. After providing a pilot oil at a certain pressure, reverse conduction from port 1 (load port) to port 2 (valve port) can be achieved.

[0085] The sixth control valve (valve ⑥) has an A port, a B port, a P port and a T port. The T port of the sixth control valve is connected to the return oil pipe at point D. That is, the T return oil port of the sixth control valve is connected to the return oil tank through the transparent return oil pipe and the connection port at point D.

[0086] Oil pump #2 is connected to the oil tank and is used to pump pressurized oil to the pilot oil circuit. That is, oil pump #2 has an inlet and an outlet. The inlet of oil pump #2 is connected to the oil tank via an oil pipe, and the outlet of oil pump #2 is connected to the sixth control valve via an oil pipe. In other words, oil pump #2 is used to provide adjustable high pressure and low flow rate for the entire system (when it is necessary to test the valve's opening pressure, it can provide low pressure and low flow rate to the valve's pilot port).

[0087] The fourth control valve is located on the oil line between the A port of the sixth control valve and the second quick-connect module 70; the fifth control valve is located on the oil line between the B port of the sixth control valve and the second quick-connect module 70. Both the fourth control valve (valve ④) and the fifth control valve (valve ⑤) can be two-position, two-normally-flow solenoid ball valves. When there is leakage in the neutral position of the sixth control valve, the fourth and fifth control valves are used to isolate pressure transmission to the second quick-connect module 70.

[0088] The No. 2 flow sensor is installed in the oil line between the oil outlet of the No. 2 oil pump and the P port of the sixth control valve to monitor the oil outlet flow of the No. 2 oil pump.

[0089] Pressure sensor #3 is located in the oil line between the fourth control valve and one of the quick-connect couplings in the second quick-connect module 70, and is used to monitor the pressure value in the corresponding hydraulic oil line.

[0090] Pressure sensor #4 is located in the oil line between the fifth control valve and another quick-connect connector in the second quick-connect module 70, and is used to monitor the pressure value in the corresponding hydraulic oil line.

[0091] Continue reading Figure 1 and Figure 3 In some embodiments of this utility model, a No. 2 throttle valve is also provided on the pilot oil circuit. The No. 2 throttle valve is located on the oil circuit between the oil outlet of the No. 2 oil pump and the No. 2 flow sensor, and is used to adjust the pressure oil flow in the corresponding oil circuit, so as to keep the flow in the corresponding hydraulic oil circuit stable.

[0092] Continue reading Figure 1 and Figure 3 In some embodiments of this utility model, a third check valve 50 and a pressure gauge #2 are provided on the pilot oil circuit.

[0093] The third check valve 50 is located in the oil line between the #2 flow sensor and the P port of the sixth control valve to prevent backflow of oil. When the pressure in the test system suddenly increases, it prevents oil from flowing back into the #2 oil pump and damaging it.

[0094] Pressure gauge #2 is installed in the oil line between the third check valve 50 and the P port of the sixth control valve. Pressure gauge #2 is used to display the pressure applied to the P port of the sixth control valve.

[0095] Continue reading Figure 1 and Figure 3 In some embodiments of this utility model, the second overflow oil line is provided with a 4# overflow valve, a fourth check valve 80 and a seventh control valve.

[0096] The #4 relief valve is connected in series on the return oil pipe at point E. When the return oil pipe at point E reaches the set pressure of the #4 relief valve, excess flow is allowed to overflow back to the oil tank, ensuring the inlet pressure of the #4 relief valve. When the outlet oil pressure from the #2 oil pump exceeds the set pressure of the #4 relief valve, overflow oil flows back to the oil tank through the connection at point E, simultaneously ensuring a stable outlet pressure for the #2 oil pump.

[0097] Among them, the direct-acting relief valve of the 4# relief valve is connected in series on the return oil pipe at point E, and the remote control port of the pilot-operated relief valve of the 4# relief valve is connected to the oil inlet of the direct-acting relief valve, so that the pilot-operated relief valve (i.e., remote pressure regulating valve) can be used for remote pressure regulation.

[0098] The fourth check valve 80 is located on the return oil pipe at point E to prevent oil from flowing in the opposite direction.

[0099] The seventh control valve is self-locking with the 4# relief valve. The seventh control valve (valve ⑦) can be a two-position two-way solenoid valve. The seventh control valve is used to control the pressure build-up of the pilot relief valve of the 2# oil pump.

[0100] It should be noted that oil filters are installed on the oil lines before the oil pumps in both the main oil line and the pilot oil line. This means that the oil inlets of oil pumps #1 and #2 can be connected to the oil tank through the coarse oil filter. The coarse oil filter can effectively filter out large particulate impurities in the oil, thereby protecting oil pumps #1 and #2.

[0101] Table 1 shows the action table of each valve in the hydraulic control valve performance test system.

[0102]

[0103] As shown in Table 1, the performance testing system for hydraulic control valves has both manual and automatic control modes. During testing, the hydraulic pump is started, and the relief valve and throttle valve are adjusted to set the pressure and flow rate of the corresponding oil circuit. Then, in the human-machine interface, the corresponding test items are selected according to the hydraulic control valve under test. The performance testing system drives each solenoid valve to work in the preset state to achieve multiple target function tests.

[0104] Continue reading Figure 1 The hydraulic control valve performance testing system provided by this utility model will be described in detail using the 1# to 4# balance valves as examples to illustrate the testing process for each performance characteristic.

[0105] (1) Test the forward conduction function of the balance valve:

[0106] See Figure 1 Drive the seventh control valve (valve ⑦) to work in the left position, and start the 2# oil pump. Drive the sixth control valve (valve ⑥) to work in the left position, and the eighth control valve (valve ⑧) to work in the right and left positions in sequence. Connect and observe the 2# flow sensor and the transparent return oil pipe connected to point F to determine whether the balance valves of the 1# to 4# test subjects are in the normal forward conduction working state.

[0107] When the displayed value of the No. 2 flow sensor is lower than the target value, or when no oil is seen flowing through the transparent return oil pipe connected to point F, the test balance valve with abnormal "forward conduction function" can be further located by using quick-connect fittings that are disconnected one by one.

[0108] (2) Pressure calibration test of the balancing valve:

[0109] See Figure 1 Drive the ninth control valve (valve ⑨) to the left position and start the #1 oil pump. Adjust the pressure of the #5 relief valve to the target calibration relief pressure of the tested balance valve (the target calibration relief pressure is generally 1.3 times the rated load pressure). Drive the eighth control valve (valve ⑧) to the right position and drive the sixth control valve (valve ⑥) to the right position. Continuous oil flow should be visible on the return oil pipe connected to point D.

[0110] Then tighten the balance valve of subject #1 as required (e.g., clockwise) until the flow measured by flow sensor #1 shows a significant reduction, indicating that the balance valve of subject #1 has reached the target calibration pressure.

[0111] Continue to adjust the balance valve of test subject #2 to tighten it as required (e.g., clockwise) until the flow measured by flow sensor #1 is zero, which indicates that the balance valve of test subject #2 has reached the target calibration pressure.

[0112] Next, adjust the pressure of the 5# relief valve appropriately (higher than 1.3 times the rated load pressure) to a pressure higher than the calibrated pressure. You should be able to observe continuous oil flow from the return oil pipes of the tested 1# and 2# balance valves connected to point D.

[0113] Drive the eighth control valve (valve ⑧) to the left position, and keep the sixth control valve (valve ⑥) in the left position. A continuous flow of oil should be visible on the return oil pipe connected to point D. Tighten the balancing valve of test subject #3 as required (e.g., clockwise) until the flow measured by flow sensor #1 shows a significant reduction, indicating that the balancing valve of test subject #3 has reached the target calibration pressure.

[0114] Continue to adjust the balance valve of test subject #4 to tighten it as required (e.g., clockwise) until the flow measured by flow sensor #1 is zero, which indicates that the balance valve of test subject #4 has reached the target calibration pressure.

[0115] Next, adjust the pressure of the 5# relief valve appropriately (higher than 1.3 times the rated load pressure) to a pressure higher than the calibrated pressure. It should be observed that the oil return pipes of the 3# and 4# balance valves connected to point D have continuous oil output, and the 1# flow sensor has a non-zero flow reading.

[0116] It should be noted that if it is necessary to calibrate the pressure of a single balance valve, this can be achieved by plugging and unplugging the quick-connect fitting of the corresponding branch.

[0117] (3) Overflow pressure test of the balancing valve:

[0118] See Figure 1 Start oil pump #1 and set the pressure of relief valve #5 to slightly lower than the relief pressure of the tested balance valve (it is recommended that the set pressure at this time be 85% of the valve's rated relief pressure value). Drive control valve #8 (valve ⑧) to the right position and drive control valve #6 (valve ⑥) to the right position. At this time, there should be no return oil in the return oil pipe connected to point D, and the result measured by flow sensor #1 should be zero.

[0119] Slowly increase the pressure of the #5 relief valve to the target valve relief pressure (recommended value is higher than 1.3 times the rated load pressure). Observe the oil return of the return oil pipe connected to point D and the flow rate of the #1 flow sensor to determine whether the #1 and #2 tested balance valves are in normal relief operation. At this time, the reading of the #5 pressure sensor is the relief pressure of the #1 and #2 tested balance valves.

[0120] Next, set the pressure of the 5# relief valve to slightly lower than the relief pressure of the tested balance valve (the recommended setting pressure at this time is 85% of the valve's rated relief pressure value). Drive the eighth control valve (valve ⑧) to the left position, and keep the sixth control valve (valve ⑥) in the right position. At this time, there should be no return oil in the return oil pipe connected to point D, and the result measured by the 1# flow sensor should be zero. Then slowly increase the pressure of the 5# relief valve to the target valve relief pressure (the recommended value is higher than 1.3 times the rated load pressure), observe the return oil in the return oil pipe at point D and the flow rate value of the 1# flow sensor, and determine whether the tested balance valves 3# and 4# are in normal relief operation. At this time, the reading of the 6# pressure sensor is the relief pressure of the tested balance valves 3# and 4#.

[0121] It should be noted that if no oil flow is observed through the transparent return oil pipe connected to point D, or if the reading of the #1 flow sensor is lower than the target value, the test balance valve with abnormal overflow pressure can be further located by using quick-connect fittings that are disconnected one by one.

[0122] (4) Opening pressure test of the balancing valve:

[0123] See Figure 1 Drive the seventh control valve (valve ⑦) and the ninth control valve (valve ⑨) to the left position, and start oil pumps #1 and #2. Set the pressure of the #5 relief valve to slightly lower than the relief pressure of the tested balance valve (it is recommended that the set pressure at this time be 85% of the valve's rated relief pressure value). Set the pressure of the #4 relief valve to zero or the minimum adjustable value. Drive the eighth control valve (valve ⑧) and the sixth control valve (valve ⑥) to the right position. Observe that there should be no return oil in the return oil pipe at point D, and the flow value of the #1 flow sensor should be zero. Slowly increase the pressure of the #4 relief valve until there is return oil in the return oil pipe at point D and the flow value of the #1 flow sensor shows a reading. At this time, the reading of the #4 pressure sensor is the opening pressure of the tested balance valves #1 and #2.

[0124] Set the pressure of relief valve #4 to zero or the adjustable minimum value, drive control valve #8 (valve ⑧) to the left position, and drive control valve #6 (valve ⑥) to the right position. Then slowly increase the pressure of relief valve #4 until there is oil return in the return oil pipe at point D and the flow rate of flow sensor #1 is displayed. At this time, the reading of pressure sensor #4 is the opening pressure of the tested balance valves #3 and #4.

[0125] It should be noted that, in order to accurately measure the opening pressure of one or multiple balance valves at the same time, quick-connect fittings can be added or reduced as needed for testing.

[0126] (5) Reset pressure test of the balance valve:

[0127] See Figure 1 Start oil pump #1, set the pressure of relief valve #5 to slightly higher than the overflow pressure of the tested balance valve (recommended value is higher than 1.3 times the rated load pressure), drive control valve #8 (valve ⑧) to the right position, and drive control valve #6 (valve ⑥) to the right position. At this time, there should be oil return in the return oil pipe at point D, and flow sensor #1 should show a flow reading. Slowly reduce the pressure of relief valve #5 until there is no oil return in the return oil pipe at point D and the reading of flow sensor #1 is zero. At this time, the pressure measured by pressure sensor #5 is the reset pressure of the tested balance valves #1 and #2.

[0128] Next, set the pressure of the 5# relief valve to slightly higher than the relief pressure of the tested balance valve (recommended value is higher than 1.3 times the rated load pressure), drive the eighth control valve (valve ⑧) to the left position, and drive the sixth control valve (valve ⑥) to the right position. At this time, there should be oil return in the return oil pipe at point D and the flow sensor 1 should show a flow reading. Slowly reduce the pressure of the 5# relief valve (recommended setting pressure at this time is 85% of the valve's rated relief pressure value) until there is no oil return in the return oil pipe at point D and the reading of the flow sensor 1 is zero. At this time, the pressure measured by the pressure sensor 6 is the reset pressure of the tested balance valves 3# and 4#.

[0129] It should be noted that, in order to accurately measure the reset pressure of one or multiple balance valves at the same time, quick-connect fittings may be added or reduced as needed for testing.

[0130] (6) Leakage test of the balancing valve:

[0131] 1) Test using the pressure drop method:

[0132] See Figure 1 Drive the ninth control valve (valve ⑨) to the left position and start the #1 oil pump. Set the pressure of the #5 relief valve to slightly higher than the relief pressure of the tested balance valve (recommended value is higher than 1.3 times the rated load pressure). Drive the eighth control valve (valve ⑧) to the right position and drive the sixth control valve (valve ⑥) to the right position. At this time, there should be oil return in the return oil pipe at point D and the #1 flow sensor should show a flow reading. Slowly reduce the pressure of the #5 relief valve (recommended setting pressure at this time is 85% of the valve's rated relief pressure value) until there is no oil return in the return oil pipe at point D and the reading of the #1 flow sensor is zero. Drive the eighth control valve (valve ⑧) to the middle position and record the reading of the #5 pressure sensor at this moment. This is the starting value for the leakage of the #1 and #2 tested balance valves using the pressure drop method. Shut down oil pump #1 for a certain period of time (recommended duration ≥3min), and then record the reading of pressure sensor #5 at this moment. This is the end value of the leakage test of the balance valves #1 and #2 using the pressure drop method. The difference between the initial value and the end value can be used to characterize the sum of the leakage of the balance valves #1 and #2 under the reset pressure.

[0133] Drive the eighth control valve (valve ⑧) to the neutral position first, then to the left position, and record the reading of pressure sensor #6 at this moment. This is the initial value of the leakage of the balanced valves #3 and #4 tested using the pressure drop method. Turn off oil pump #1 and continue for a certain period of time (recommended duration ≥ 3 min). Record the reading of pressure sensor #6 at this moment. This is the final value of the leakage of the balanced valves #3 and #4 tested using the pressure drop method. The difference between the initial value and the final value can be used to characterize the sum of the internal leakage of the balanced valves #3 and #4 tested under this reset pressure.

[0134] It should be noted that, in order to accurately measure the reset pressure of one or multiple balance valves at the same time, quick-connect fittings can be added or reduced as needed for testing.

[0135] 2) Quantitative testing method:

[0136] See Figure 1 Start oil pump #1, set the pressure of relief valve #5 to be slightly higher than the relief pressure of the balance valve under test (the recommended value is higher than 1.3 times the rated load pressure), drive control valve #8 (valve ⑧) to work in the right position, and drive control valve #6 (valve ⑥) to the right position. At this time, there should be oil return in the return oil pipe at point D and flow sensor #1 should have flow reading. Slowly reduce the pressure of the 5# overflow valve until there is no return oil in the return oil pipe at point D and the reading of the 1# flow sensor is zero. Disconnect the 3# quick-connect connector connected to port ② of the tested balance valve, and connect it to the leakage measurement fixture (a combination of quick-connect connector and short, thin oil pipe, reference length 20cm, diameter ≤1cm). Connect the other end of the leakage measurement fixture to a measuring cylinder or measuring cup to collect the leaking oil from the tested 1# and 2# balance valves. After collecting the oil for a certain period of time (recommended duration is more than 3 minutes), use the method of directly reading the measuring cylinder, or use a high-precision electronic balance to weigh the leaking oil, and then calculate the sum of the average leakage of the tested 1# and 2# balance valves during the test time using the mass / density formula.

[0137] It should be noted that, in order to accurately measure the average leakage of one or multiple balance valves at the same time, quick-connect fittings can be added or removed as needed for testing.

[0138] Then drive the eighth control valve (valve ⑧) to the left position, disconnect the 4# quick-connect connector connected to port ② of the tested balance valve, and connect it to the leakage measurement fixture (a combination of quick-connect connector and short, thin oil pipe, reference length 20cm, diameter ≤1cm). Connect the other end of the leakage measurement fixture to a measuring cylinder or measuring cup to collect the leaking oil from the tested 3# and 4# balance valves. After collecting the oil for a certain period of time (recommended duration is more than 3 minutes), use the method of directly reading the measuring cylinder, or use a high-precision electronic balance to weigh the leaking oil, and then calculate the sum of the average leakage of the tested 3# and 4# balance valves during the test time using the mass / density formula.

[0139] It should be noted that, in order to accurately measure the average leakage of one or multiple balance valves at the same time, quick-connect fittings can be added or removed as needed for testing.

[0140] (7) Pressure resistance test of the balancing valve:

[0141] 1) Forward conduction withstand pressure test:

[0142] See Figure 1 Drive the seventh control valve (valve ⑦) to the left position and start the #2 oil pump. Set the #4 relief valve to the target pressure resistance test pressure, drive the sixth control valve (valve ⑥) to the left position, drive the eighth control valve (valve ⑧) to the middle position, and keep the #2 oil pump running continuously for a certain period of time (recommended duration ≥3min). After this, the forward conduction pressure resistance test of the tested #1 to #4 balance valves can be completed.

[0143] 2) Reverse conduction pressure test:

[0144] After completing the forward conduction pressure test in step 1) above, shut down oil pump #2, drive control valve 9 (valve ⑨) to the left position, and start oil pump #1. Set overflow valve #5 to the target pressure test pressure, drive control valves 4 (valve ④) and 5 (valve ⑤) to the left position, drive control valve 6 (valve ⑥) to the center position, and drive control valve 8 (valve ⑧) to the right position. Keep oil pump #1 running continuously for a certain period of time (recommended duration ≥ 3 minutes) to complete the reverse conduction pressure test of the tested balance valves #1 and #2. Continue to keep control valves 4 (valve ④) and 5 (valve ⑤) in the left position, drive control valve 6 (valve ⑥) to the center position, and drive control valve 8 (valve ⑧) to the left position. Keep oil pump #1 running continuously for a certain period of time (recommended duration ≥ 3 minutes) to complete the reverse conduction pressure test of the tested balance valves #3 and #4.

[0145] It should be noted that, in order to conduct pressure tests on one or multiple balance valves simultaneously, quick-connect fittings may be added or reduced as needed.

[0146] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A performance testing system for a hydraulic control valve, characterized in that, include: A support device suitable for supporting the hydraulic control valve under test; The main system includes: The main oil circuit has one end connected to the oil tank and the other end equipped with a first quick-connect module, which is connected to the hydraulic control valve under test. The main oil circuit is used to control the pressure of the performance testing system under the corresponding test function. The first overflow oil passage is connected to the main oil passage and is used to regulate and maintain the pressure of the main oil passage; The pilot system includes: A pilot oil circuit is provided, one end of which is connected to an oil tank, and the other end of which is provided with a second quick-connect module, which is connected to the hydraulic control valve under test; the pilot oil circuit is used to control the pressure of the performance testing system under the corresponding test function; The second overflow oil passage is connected to the pilot oil passage and is used to regulate and maintain the pressure of the pilot oil passage.

2. The performance testing system for the hydraulic control valve according to claim 1, characterized in that, The main oil line is equipped with: Oil pump #1 has an oil inlet and an oil outlet, and the oil inlet of oil pump #1 is connected to the oil tank; The eighth control valve has an A port, a B port, a P port and a T port, wherein the T port of the eighth control valve is connected to the return oil pipe at point F; A flow sensor #1 is installed in the oil line between the oil outlet of the #1 oil pump and the P port of the eighth control valve to monitor the oil outlet flow of the #1 oil pump. Pressure sensor #5 is located in the oil line between port A of the eighth control valve and the first quick-connect module, and is used to monitor the pressure value in the corresponding hydraulic oil line. Pressure sensor #6 is located in the oil line between port B of the eighth control valve and the first quick-connect module, and is used to monitor the pressure value in the corresponding hydraulic oil line.

3. The performance testing system for the hydraulic control valve according to claim 2, characterized in that, The main oil line is also equipped with: The No. 1 throttle valve is located in the oil line between the oil outlet of the No. 1 oil pump and the No. 1 flow sensor, and is used to regulate the pressure oil flow rate in the corresponding oil line.

4. The performance testing system for the hydraulic control valve according to claim 3, characterized in that, The main oil line is also equipped with: The first check valve is located in the oil line between the No. 1 flow sensor and the P port of the eighth control valve to prevent the oil from flowing backward. Pressure gauge #3 is installed in the oil line between the first check valve and the P port of the eighth control valve to display the oil line pressure before the P port of the eighth control valve.

5. The performance testing system for the hydraulic control valve according to claim 1, characterized in that, The first overflow oil line is equipped with: The No. 5 relief valve is connected in series on the return oil pipe at point G. It is used to allow the oil to flow back to the oil tank when the return oil pipe at point G reaches the set pressure of the No. 5 relief valve. The second check valve, located on the return oil pipe at point G, is used to prevent the oil from flowing in the opposite direction. The ninth control valve is self-locking with the #5 overflow valve and is used to control the pressure of the #5 overflow valve.

6. The performance testing system for the hydraulic control valve according to claim 1, characterized in that, The pilot oil circuit is equipped with: Oil pump #2 has an oil inlet and an oil outlet, and the oil inlet of oil pump #2 is connected to the oil tank; The sixth control valve has an A port, a B port, a P port and a T port, and the T port of the sixth control valve is connected to the return oil pipe at point D. The fourth control valve is located on the oil line between the A port of the sixth control valve and the second quick-connect module; The fifth control valve is located on the oil line between the B port of the sixth control valve and the second quick-connect module; when there is a leak in the neutral position of the sixth control valve, the fourth control valve and the fifth control valve are used to isolate the pressure transmission to the second quick-connect module. The No. 2 flow sensor is installed in the oil line between the oil outlet of the No. 2 oil pump and the P port of the sixth control valve to monitor the oil outlet flow of the No. 2 oil pump. Pressure sensor #3 is located in the oil circuit between the fourth control valve and the second quick-connect module, and is used to monitor the pressure value in the corresponding hydraulic oil circuit; Pressure sensor #4 is located in the oil circuit between the fifth control valve and the second quick-connect module, and is used to monitor the pressure value in the corresponding hydraulic circuit.

7. The performance testing system for the hydraulic control valve according to claim 6, characterized in that, The pilot oil circuit is also equipped with: The throttle valve #2 is located in the oil line between the oil outlet of the #2 oil pump and the #2 flow sensor, and is used to regulate the pressure oil flow rate in the corresponding oil line.

8. The performance testing system for the hydraulic control valve according to claim 7, characterized in that, The pilot oil circuit is also equipped with: The third check valve is located in the oil line between the No. 2 flow sensor and the P port of the sixth control valve to prevent the oil from flowing backward. Pressure gauge #2 is installed in the oil line between the third check valve and the P port of the sixth control valve to display the oil line pressure before the P port of the sixth control valve.

9. The performance testing system for the hydraulic control valve according to claim 1, characterized in that, The second overflow oil line is equipped with: The No. 4 relief valve is connected in series on the return oil pipe at point E. It is used to allow the oil to flow back to the oil tank when the return oil pipe at point E reaches the set pressure of the No. 4 relief valve. The fourth check valve, located on the return oil pipe at point E, is used to prevent oil from flowing in the opposite direction. The seventh control valve is self-locking with the #4 overflow valve and is used to control the pressure of the #4 overflow valve.

10. The performance testing system for a hydraulic control valve according to any one of claims 1 to 9, characterized in that, Oil filters are installed on the oil lines before the oil pumps in both the main oil line and the pilot oil line.

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