Integrated test system and test method for hydraulic valve and combined valve block

Abstract

The application discloses a kind of hydraulic valve and integrated test system and test method of combined valve block, belong to hydraulic component detection technical field;System includes oil supply unit, pressure regulating unit, multichannel test unit and oil return path;Oil supply unit provides filtered, pressure oil liquid after stabilizing, pressure regulating unit realizes import pressure adjustable;Multichannel test unit is equipped with one inlet three outlet operation platform, leads out independent B port, C port, D port test branch, each branch is configured reversing valve group, throttling regulating assembly, pressure sensor and flowmeter;A set of equipment can be compatible with pressure reducing valve, medium-pressure safety valve, high-pressure safety valve, four kinds of independent valves and combined valve block group performance test, switching can be realized multiple test conditions by reversing valve, without frequent disassembly pipeline;It can simulate combined valve block whole machine linkage condition, test coverage is wide, test efficiency is high, effectively reduce the investment cost of multiple special test equipment.

Description

Technical Field

[0001] This invention relates to the field of hydraulic component performance testing technology, specifically to an integrated testing system and method for hydraulic valves and combined valve blocks. Background Technology

[0002] A certain type of closed hydraulic system, such as Figure 1 As shown, the system consists of a DC motor, hydraulic pump, check valve, load valve, oil filter, flow divider valve, pressure reducing valve, high-pressure safety valve, medium-pressure safety valve, branch servo mechanism, main servo mechanism, relief valve, and closed oil tank. The hydraulic oil from the load valve passes through the oil filter in the combined valve block to the flow divider valve. Before reaching the flow divider valve, if the pressure exceeds the specified pressure, it will be released from the high-pressure safety valve, and the excess oil will flow back to the oil tank. The hydraulic oil from the flow divider valve flows in two directions: one to the main servo mechanism for control, and the other to the pressure reducing valve. If the pressure exceeds the specified pressure, it will be released from the medium-pressure safety valve, and the excess oil will flow back to the oil tank. If the pressure is within the specified range, the hydraulic oil will flow to the branch servo mechanism for control.

[0003] The aforementioned oil filter, flow divider valve, pressure reducing valve, high-pressure safety valve, and medium-pressure safety valve are integrated and mounted on the same valve block to form a combined valve block assembly, which is the core control component of the closed-loop hydraulic system. According to usage requirements, multiple performance tests, including pressure, flow rate, leakage, flow distribution, and pressure stability, need to be conducted on the four types of independent hydraulic valves (pressure reducing valve, medium-pressure safety valve, high-pressure safety valve, and flow divider valve) and the overall combined valve block assembly. The oil filter, however, is only a system component and does not undergo separate performance testing.

[0004] Existing testing methods mostly involve dedicated test benches for single valves. Different hydraulic valves and combined valve blocks require separate test equipment, resulting in high equipment costs, large space requirements, cumbersome oil circuit switching, and fragmented testing processes. Furthermore, these methods cannot simulate the coordinated operation of combined valve blocks within the entire machine, leading to insufficient testing efficiency and comprehensiveness. Therefore, there is an urgent need to design a universal testing system and supporting testing methods to achieve integrated, full-item testing of four types of independent hydraulic valves and combined valve block assemblies. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides an integrated testing system and method for hydraulic valves and combined valve blocks. One device can be compatible with the performance testing of various independent hydraulic valves and integrated combined valve blocks, with convenient switching of operating conditions, flow meter impact protection function, high flow regulation accuracy, reduced investment in testing equipment, and improved testing efficiency.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: an integrated testing system for hydraulic valves and combined valve blocks, comprising an oil supply unit, a pressure regulating unit, a multi-channel testing unit, and a return oil circuit; The oil supply unit includes an oil supply port, an electrically controlled ball valve P2, a filter KP1 with a blockage alarm, and an accumulator; The oil supply port is connected to the inlet of filter KP1 with blockage alarm via the electrically controlled ball valve P2. The rear end of filter KP1 with blockage alarm is connected to input pressure gauge SP5 and accumulator. The pressure regulating unit includes a proportional pressure reducing valve YV2 and an electrically controlled two-position four-way directional valve YV1. The inlet of the proportional pressure reducing valve YV2 is connected to the outlet of the filter KP1, and its outlet is connected to the inlet of the electrically controlled two-position four-way directional valve YV1. The outlet of the electrically controlled two-position four-way directional valve YV1 is connected in series with the oil temperature sensor T, the filter, the oil supply pressure gauge SP4, and the flow meter SQ4 to the multi-channel test unit. The multi-channel test unit includes a one-input, three-output operating platform. The operating platform has ports A, B, C, and D. The filter outlet is connected to port A of the operating platform. The operating platform also has branches for ports B, C, and D. B-port branch: Pressure sensor SP1 and B-port filter are connected in series at B-port. The downstream end is divided into three parallel oil circuits. The first circuit is a two-position two-way directional valve YV7 connected in series with throttle valve YV10. The second circuit is a two-position two-way directional valve YV8 connected in series with throttle valve YV11. The third circuit is a two-position two-way directional valve YV9. The three circuits are connected in parallel and then connected in series with B-port flow meter SQ1, and then connected to the return oil circuit. B-port flow meter SQ1 is equipped with a bypass protection directional valve YV13 in parallel. C-port branch: Pressure sensor SP2 and C-port filter are connected in series at C-port. Two parallel oil circuits are set at the rear end. The first circuit is a two-position two-way directional valve YV4 connected in series with throttle valve YV6. The second circuit is a two-position two-way directional valve YV5. The two circuits are connected in parallel and then connected in series with C-port flow meter SQ2. Then it is connected to the return oil circuit. C-port flow meter SQ2 is equipped with a bypass protection directional valve YV12 in parallel. D-port branch: D-port pressure sensor SP3, D-port filter, 2-position 2-way reversing valve YV3, D-port flow meter SQ3 are connected in series in sequence; then connected to the return oil circuit; The return oil circuit includes a return oil pressure gauge and a check valve, which are ultimately connected to the return oil port.

[0007] Furthermore, the proportional pressure reducing valve YV2 is used for setting the input pressure; the electrically controlled two-position four-way directional valve YV1 is used for the logic switch of the input pressure; the throttle valves YV6, YV10, and YV11 are all manually adjustable throttle valves or electrically controlled proportional throttle valves, used for flow adjustment during valve testing; the two-position two-way directional valve YV5 is used to short-circuit the throttle valve YV6 at port C, and the two-position two-way directional valve YV9 is used to short-circuit the throttle valves YV10 and YV11 at port B; when YV5 or YV9 is connected, no oil flows through the throttle valve of the corresponding branch, realizing rapid oil return or protecting the flow meter.

[0008] A testing method for an integrated testing system based on hydraulic valves and combined valve blocks includes: single valve testing mode, flow divider valve testing mode, and combined valve block testing mode; The single-valve test mode independently tests the pressure reducing valve, medium-pressure safety valve, and high-pressure safety valve, with the following specific steps: Install the pressure reducing valve, medium-pressure safety valve, or high-pressure safety valve to be tested on the operating table. Connect the hydraulic inlet of the valve to be tested to port A and the hydraulic outlet to port C, and close the oil circuits at ports D and B. Open the two-position two-way directional valve YV4 and close the two-way directional valve YV5. Adjust the input pressure through the proportional pressure reducing valve YV2 and the outlet flow rate through the throttle valve YV6. Use the pressure sensor SP2 and the flow meter SQ2 at port C to measure the outlet pressure and flow rate, and complete the pressure-flow characteristic, opening pressure, closing pressure, or leakage test. Flow divider valve test mode: Connect the hydraulic inlet of the flow divider valve to port A, the hydraulic outlet of the flow divider valve to the branch servo mechanism to port C, and the hydraulic outlet of the flow divider valve to the main servo mechanism to port B; close port D, open the two-position two-way directional valves YV4, YV7, and YV8, and close the electrically controlled two-position two-way directional valves YV5 and YV9; adjust the input pressure of the proportional pressure reducing valve YV2, and adjust the flow rate of port C and port B respectively through the throttle valves YV6, YV10, and YV11; pressure sensors SP1 and SP2 measure the pressure of the two outlets, and flow meters SQ1 at port B and SQ2 at port C measure the flow rate of the two outlets to complete the rated flow rate, rated pressure, and flow divider ratio test; Combined valve block test mode: Connect the hydraulic inlet of the combined valve block, which includes an oil filter, flow divider valve, pressure reducing valve, high-pressure safety valve, and medium-pressure safety valve, to port A; connect the parallel hydraulic outlets of the high-pressure safety valve and the medium-pressure safety valve to port D; connect the hydraulic outlet of the flow divider valve leading to the branch servo mechanism to port C; and connect the hydraulic outlet of the flow divider valve leading to the main servo mechanism to port B. Adjust the input pressure through the proportional pressure reducing valve YV2, and adjust the throttle valves YV6, YV10, and YV11 to make the flow rates at ports C and B reach the rated values. Measure the overflow flow rate of the safety valve through the flow meter SQ3 at port D to complete the tests on the total flow rate of the combined valve block, the pressure and flow rate of each output branch, and the opening characteristics of the safety valve.

[0009] Furthermore, in the diversion valve test mode, the specific steps for the diversion ratio test are as follows: keep the total input flow rate at the rated value, adjust the throttle valves YV6, YV10 and YV11 to make the readings of pressure sensor SP1 and pressure sensor SP2 equal, then read the flow values ​​of flow meter SQ1 at port B and flow meter SQ2 at port C, calculate the ratio of the two flow rates and compare it with the design requirement value.

[0010] Further, during the test preparation and test completion phases, the two-position two-way directional valves YV12 and YV13 are first opened to provide oil buffer protection for the C-port flow meter SQ2 and the B-port flow meter SQ1.

[0011] Compared with the prior art, the present invention has the following significant technical advantages: A single testing system can perform comprehensive testing of four types of independent hydraulic valves—pressure reducing valves, medium-pressure safety valves, high-pressure safety valves, and flow diverting valves—as well as combined valve blocks. It determines whether the performance of each hydraulic component and assembly meets the requirements of the entire machine. The system takes into account the protection of the flow meter. Moreover, the system is simple to operate, has complete functions, good safety, and a high degree of integration. Testing each valve does not require changing the test bench or frequently disassembling and assembling pipelines, which greatly improves testing efficiency, has high reliability, saves the manufacturing costs of multiple testing equipment and tooling, and greatly reduces testing costs.

[0012] By using the parallel design of independent directional valve groups and throttle valve groups at ports B, C, and D, and the short-circuit branches of two-position two-way directional valves YV5 and YV9, rapid switching between three test modes—single valve, diverter valve, and combination valve—is achieved. In the single valve test mode, pressure reducing valves, medium-pressure safety valves, and high-pressure safety valves can be tested independently, and rapid oil return or flow meter protection can be achieved without disassembling the throttle valve.

[0013] Parallel protection directional valves YV12 and YV13 are connected at the flow meter end of the high-flow branch. The bypass is opened during the test preparation or completion stage to avoid damage to the precision flow meter by high flow impact, thereby improving the system reliability.

[0014] A proportional pressure reducing valve YV2 is used to achieve continuous and precise adjustment of the input pressure. A throttling valve group consisting of a coarse flow regulating valve YV10 and a fine flow regulating valve YV11 connected in series is used to achieve independent and fine adjustment of the flow of the two flow paths of the diverter valve, meeting the requirements of high-precision testing.

[0015] During the testing of the combined valve block, the coordinated working performance of the high-pressure safety valve, medium-pressure safety valve, diverter valve, and pressure reducing valve can be tested simultaneously with a single installation. It can also simulate input pressure fluctuation conditions to comprehensively assess the steady-state and dynamic performance of the combined valve block. The oil circuit logic is clear, the manual operation steps are few, the testing process is standardized, and a remote control valve can be selected to realize the automatic testing of various indicators. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a combined hydraulic valve block; Figure 2 This is the schematic diagram of the test system; Figure 3 It is a test flowchart; Figure 4 This is a schematic diagram of a safety valve structure; Figure 5 This is a schematic diagram of a pressure reducing valve. Figure 6 This is a schematic diagram of a flow divider valve. In the diagram: P is the valve inlet, O is the valve outlet, O1 is the outlet from the diverter valve to the pressure reducing valve, and O2 is the outlet from the diverter valve to the main servo mechanism. Detailed Implementation

[0017] The following detailed description of the specific embodiments of the present invention is based on actual test cases and the technical solutions defined in the claims.

[0018] Example 1: Test System Structure: like Figure 2 As shown, an integrated testing system for hydraulic valves and combined valve blocks is described. The oil supply port is connected to an external hydraulic pump. An electrically controlled ball valve P2 is connected in series in the oil supply pipeline as a main switch, followed by a filter KP1 with a blockage alarm. After the filter, KP1 is connected to an accumulator to stabilize the pressure and a first pressure gauge SP5 to monitor the pressure after filtration. Then, a proportional pressure reducing valve YV2 is connected, and its outlet is connected to an electrically controlled two-position four-way directional valve YV1 as the main test switch. After the electrically controlled two-position four-way directional valve YV1, an oil temperature sensor T, a fine filter, an oil supply pressure gauge SP4, and a flow meter SQ4 are connected in series to monitor the total oil supply pressure and flow rate of the system.

[0019] The outlet of the fine filter is connected to port A of the control panel. The control panel is a one-in-three-out hydraulic integrated block. Port A is a common inlet, and ports B, C, and D are three independently controllable outlets. The B-port oil circuit is connected sequentially to pressure sensor SP1 and filter, then splits into three parallel branches: Branch 1 consists of directional valve YV7 and throttle valve YV10 connected in series; Branch 2 consists of directional valve YV8 and throttle valve YV11 connected in series; Branch 3 consists of directional valve YV9. The three branches converge and connect to B-port flow meter SQ1, then to the return oil main. A protective directional valve YV13 is connected in parallel upstream of B-port flow meter SQ1. During testing, the protective directional valve YV13 is closed; during protection, the protective directional valve YV13 is opened.

[0020] The C-port oil circuit is connected sequentially to pressure sensor SP2 and filter, and then splits into two parallel branches: branch one is a series connection of directional valve YV4 and throttle valve YV6; branch two is a directional valve YV5. The two branches merge and connect to C-port flow meter SQ2, and then to the return oil main. A protective directional valve YV12 is connected in parallel at the front end of C-port flow meter SQ2. During testing, the protective directional valve YV12 is closed, and during protection, the protective directional valve YV12 is opened.

[0021] D-port oil circuit: connected in sequence to pressure sensor SP3, filter, 2-position 2-way reversing valve YV3, and D-port flow meter SQ3, and then connected to the return oil main. Due to the small flow rate at D-port, no bypass protection is provided.

[0022] The return oil main is connected in sequence to the return oil pressure gauge and the check valve, and finally returns to the oil tank.

[0023] Test system flow: Hydraulic pump - electrically controlled ball valve P2 - filter KP1 with blockage alarm - parallel accumulator - pressure gauge SP5 - proportional pressure reducing valve YV2 - electrically controlled 2-position 4-way directional valve YV1 - filter - pressure gauge SP4 - flow meter SQ4 - temperature sensor T - control panel - split into 3 channels: a) Port D: Pressure sensor SP3 - Filter - Two-position two-way directional valve YV3 - Port D flow meter SQ3 - Return oil pressure gauge - Check valve - Return oil port; b) Port C: Pressure sensor SP2 - Filter - Two-position two-way directional valve YV4 + throttle valve YV6, two-position two-way directional valve YV5 - Port C flow meter SQ2 - Return oil pressure gauge - Check valve - Return oil port; c) Port B: Pressure sensor SP1 - Filter - 2-position 2-way directional valve YV7 + throttle valve YV10, 2-position 2-way directional valve YV8 + throttle valve YV11, 2-position 2-way directional valve YV9 - Port B flow meter SQ1 - Return oil pressure gauge - Check valve - Return oil port.

[0024] Example 2: Single valve performance test: See Figure 3 Test procedure; the single-valve test mode can independently test the pressure reducing valve, medium-pressure safety valve and high-pressure safety valve respectively.

[0025] Pressure reducing valve performance test: like Figure 5 As shown, the pressure reducing valve mainly consists of a valve body, valve core, guide seat, spring, spring seat, steel ball, bushing, adjusting screw cap, limit screw, sealing ring, etc. Hydraulic oil enters from the inlet, the inlet pressure increases, and the outlet pressure also increases. At the same time, the valve core moves to the left, the valve opening decreases, the inlet pressure decreases, and the outlet pressure also decreases. Meanwhile, the valve core moves to the right, the valve opening increases. The valve core is balanced in this position, which ultimately ensures that the output pressure remains basically unchanged.

[0026] Step 1: Install the pressure reducing valve to be tested on the operating table. Connect the inlet of the pressure reducing valve to port A and the outlet to port C. Close ports B and D of the operating table. Open the electrically controlled two-position two-way directional valve YV4 and close the electrically controlled two-position two-way directional valve YV5.

[0027] Step 2: Start the hydraulic pump. The hydraulic oil passes through filter KP1 and reaches the proportional pressure reducing valve YV2. Slowly adjust the proportional pressure reducing valve YV2 to adjust the pressure to 14±1MPa.

[0028] Step 3: Slowly adjust the opening of the throttle valve YV6 until the reading of the flow meter SQ2 at port C stabilizes at the rated flow rate of 3.0±0.3L / min; read the value of the pressure sensor SP2. If the reading is within the range of 9±1MPa, the outlet pressure performance of the pressure reducing valve is qualified.

[0029] Safety valve test: like Figure 4 As shown, medium-pressure safety valves and high-pressure safety valves are mainly composed of valve body, valve, valve seat, spring seat, spring, bushing, etc. Hydraulic oil enters from the inlet, and the pressure is balanced with the spring force. When the pressure exceeds a certain value, the valve opens and returns oil to the oil tank. When the pressure decreases, the valve closes to ensure that the inlet pressure is basically stable.

[0030] Medium-pressure safety valve test: Step 1: Connect the inlet of the medium-pressure safety valve to be tested to port A on the control panel and the outlet to port C. Close ports B and D on the control panel.

[0031] Step 2: Slowly increase the output pressure of the proportional pressure reducing valve YV2 until the system pressure reaches 13±1MPa. Read the flow rate of the flow meter SQ2 at port C. The flow rate is qualified if it is within the range of 1.2±0.2L / min.

[0032] Step 3: Adjust the pressure of the proportional pressure reducing valve YV2 to 11 ± 1 MPa or above, open the electrically controlled two-position two-way directional valve YV4, close the electrically controlled two-position two-way directional valve YV5, maintain stable pressure, and detect the outlet flow rate at port C through the flow meter SQ2. When oil flows out and the flow rate Q ≤ 0.12 L / min, the open state is deemed to be leak-free.

[0033] Step 4: Adjust the output pressure of the proportional pressure reducing valve YV2 to 10 ± 1 MPa or above, and check the leakage at the outlet of port C using the flow meter SQ2 at port C. If the leakage amount Q ≤ 0.08 L / min, the leakage in the closed state is deemed acceptable.

[0034] High-pressure safety valve testing: Step 1: Connect the inlet of the high-pressure safety valve to be tested to port A, and the outlet to port C. Close ports B and D on the control panel.

[0035] Step 2: Slowly adjust the pressure of the proportional pressure reducing valve YV2 to 20±1MPa, open the two-position two-way directional valve YV4 and close YV5, and measure the outlet flow rate at port C. It should be 2±0.2L / min, which is qualified.

[0036] Step 3: Adjust the pressure of the proportional pressure reducing valve YV2 to 17±1MPa or above, open the electrically controlled two-position two-way directional valve YV4, and close the electrically controlled two-position two-way directional valve YV5; keep the pressure stable, and detect the outlet flow rate of port C through the flow meter SQ2. When oil flows out and the flow rate Q≤0.15L / min, the open state is deemed to be leak-free.

[0037] Step 4: Adjust the output pressure of the proportional pressure reducing valve YV2 to 16±1MPa or above, and detect leakage at the outlet of port C through the flow meter SQ2 at port C. If the leakage amount Q≤0.1L / min, the leakage in the closed state is deemed acceptable.

[0038] Example 3: Diverter Valve Test like Figure 6 As shown, the diverter valve mainly consists of an end cap, valve core, spring, spring seat, valve body, and sealing ring. Hydraulic oil enters from the inlet, passes through the valve core, and after throttling, flows to the main servo mechanism and the pressure reducing valve in a certain proportion. When the flow to the main servo mechanism increases, the pressure at the variable throttling port decreases, the main valve core moves to the right, causing the opening at this point to decrease, and the flow rate decreases accordingly, thus limiting the flow and stabilizing the pressure flowing to the pressure reducing valve.

[0039] Tooling installation: Install the diverter valve on the control panel, connect the hydraulic inlet to port A, connect the branch servo side outlet to port C, connect the main servo mechanism side outlet to port B, and close the oil circuit at port D.

[0040] Flow test: Adjust the proportional pressure reducing valve YV2 to the rated inlet pressure of the diverter valve to 16±1MPa; adjust the throttle valves YV6 at port C and YV10 and YV11 at port B, coarsely adjust throttle valve YV10 and finely adjust throttle valve YV11 so that the flow rate at port C should be 2.5±0.3L / min and the flow rate at port B should be 11±0.5L / min. At the same time, the pressure at port C should meet 14±1MPa and the pressure at port B should meet 14.5±1MPa.

[0041] Flow split ratio test: Keep the input flow meter SQ4 value at 13.5±1L / min, adjust the throttle valves YV6, YV10, and YV11 to make the pressure detected by pressure sensor SP1 and pressure sensor SP2 equal, read the readings of flow meter SQ2 at port C and flow meter SQ1 at port B, calculate the flow ratio, and if it meets the range of SQ2 / SQ1=0.5±0.05, the flow split valve distribution accuracy is deemed qualified.

[0042] Example 4: Test method for combined valve block: Tooling installation: Install the combined valve block containing oil filter, diverter valve, pressure reducing valve, high-pressure safety valve, and medium-pressure safety valve on the operating table. Connect the main inlet of the combined valve block to port A; connect the parallel outlets of the high-pressure safety valve and the medium-pressure safety valve to port D; connect the outlet of the branch servo mechanism after passing through the diverter valve and pressure reducing valve to port C; connect the outlet of the diverter valve to the main servo mechanism to port B.

[0043] Basic debugging: Adjust the proportional pressure reducing valve YV2 to 16±1MPa, adjust the opening of throttle valves YV6 and YV10 to the maximum, and the opening of throttle valve YV11 to the minimum, open the electronically controlled two-position two-way directional valves YV3, YV4, YV7, and YV8, and close the two-position two-way directional valves YV5 and YV9 to make the total oil supply flow reach 13.5±1L / min.

[0044] Flow rate test: Adjust throttle valve YV6 to stabilize the flow rate at port C at 2.5±0.3L / min. Then adjust throttle valves YV10 and YV11, setting the opening of throttle valve YV10 to its maximum and the opening of throttle valve YV11 to its minimum, to stabilize the flow rate at port B at 11±0.5L / min. Read the pressure values ​​from pressure gauges SP2 and SP1. The rated pressure of the main servo system is 14.5±1MPa; the rated pressure of the branch servo system is 9±1MPa; the flow rate at port D is stabilized at Lx≤0.2L / min. The total flow rate should satisfy Li=(L1h+L2h+Lx)L / min, i.e., 13.7=11+2.5+0.2.

[0045] Pressure fluctuation test: Control the proportional pressure reducing valve YV2 to make the system input pressure fluctuate continuously within the range of 12-20MPa, and monitor the pressure and flow at port C in real time throughout the process; if the pressure is always maintained at 9±1MPa and the flow rate is always maintained at 2.5±0.3L / min, then focus on monitoring whether the flow and pressure performance of the combined valve block through the diverter valve and pressure reducing valve to the branch servo mechanism is qualified, which also proves that the combined valve block group has the ability to resist pressure fluctuations and the overall linkage performance is qualified.

[0046] Example 5: Flowmeter protection operation: Before or after the test, open the protective directional valves YV12 and YV13 to avoid impacting the flow meters at ports C and B. After the system pressure stabilizes, close the directional valves YV12 and YV13. After the test, open the directional valves YV12 and YV13 again before turning off the hydraulic pump.

[0047] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. An integrated testing system for hydraulic valves and combined valve blocks, characterized in that, This includes an oil supply unit, a pressure regulating unit, a multi-channel testing unit, and a return oil circuit; The oil supply unit includes an oil supply port, an electrically controlled ball valve P2, a filter KP1 with a blockage alarm, and an accumulator; The oil supply port is connected to the inlet of filter KP1 with blockage alarm via the electronically controlled ball valve P2. The rear end of filter KP1 with blockage alarm is connected to input pressure gauge SP5 and accumulator. The pressure regulating unit includes a proportional pressure reducing valve YV2 and an electrically controlled two-position four-way directional valve YV1. The inlet of the proportional pressure reducing valve YV2 is connected to the outlet of the filter KP1, and its outlet is connected to the inlet of the electrically controlled two-position four-way directional valve YV1. The outlet of the electrically controlled two-position four-way directional valve YV1 is connected in series with the oil temperature sensor T, the filter, the oil supply pressure gauge SP4, and the flow meter SQ4 to the multi-channel test unit. The multi-channel test unit includes a one-input, three-output operating platform. The operating platform has ports A, B, C, and D. The filter outlet is connected to port A of the operating platform. The operating platform also has branches for ports B, C, and D. B-port branch: Pressure sensor SP1 and B-port filter are connected in series at B-port. The downstream end is divided into three parallel oil circuits. The first circuit is a two-position two-way directional valve YV7 connected in series with throttle valve YV10. The second circuit is a two-position two-way directional valve YV8 connected in series with throttle valve YV11. The third circuit is a two-position two-way directional valve YV9. The three circuits are connected in parallel and then connected in series with B-port flow meter SQ1, and then connected to the return oil circuit. B-port flow meter SQ1 is equipped with a bypass protection directional valve YV13 in parallel. C-port branch: Pressure sensor SP2 and C-port filter are connected in series at C-port. Two parallel oil circuits are set at the rear end. The first circuit is a two-position two-way directional valve YV4 connected in series with throttle valve YV6. The second circuit is a two-position two-way directional valve YV5. The two circuits are connected in parallel and then connected in series with C-port flow meter SQ2. Then it is connected to the return oil circuit. C-port flow meter SQ2 is equipped with a bypass protection directional valve YV12 in parallel. D-port branch: D-port pressure sensor SP3, D-port filter, 2-position 2-way reversing valve YV3, D-port flow meter SQ3 are connected in series in sequence; then connected to the return oil circuit; The return oil circuit includes a return oil pressure gauge and a check valve, which are ultimately connected to the return oil port.

2. The integrated testing system for hydraulic valves and combined valve blocks according to claim 1, characterized in that, The proportional pressure reducing valve YV2 is used for setting the input pressure; the electrically controlled two-position four-way directional valve YV1 is used for the logic switch of the input pressure; the throttle valves YV6, YV10, and YV11 are all manually adjustable throttle valves or electrically controlled proportional throttle valves, used for flow adjustment during valve testing; the two-position two-way directional valve YV5 is used to short-circuit the throttle valve YV6 at port C, and the two-position two-way directional valve YV9 is used to short-circuit the throttle valves YV10 and YV11 at port B; when YV5 or YV9 is connected, no oil flows through the throttle valve of the corresponding branch, realizing rapid oil return or protecting the flow meter.

3. A testing method based on the integrated testing system according to any one of claims 1 to 2, characterized in that, include: Single valve test mode, flow divider valve test mode, and combined valve block test mode; The single-valve test mode independently tests the pressure reducing valve, medium-pressure safety valve, and high-pressure safety valve, with the following specific steps: The pressure reducing valve, medium-pressure safety valve, or high-pressure safety valve to be tested is mounted on the operating table. The hydraulic inlet of the valve to be tested is connected to port A, and the hydraulic outlet is connected to port C. Ports D and B are closed. The two-position two-way directional valve YV4 is opened, and the two-way directional valve YV5 is closed. The input pressure is adjusted by the proportional pressure reducing valve YV2, and the outlet flow is adjusted by the throttle valve YV6. The outlet pressure and flow are measured by the pressure sensor SP2 and the flow meter SQ2 at port C. The pressure-flow characteristics, opening pressure, closing pressure, or leakage test are completed. Flow divider valve test mode: Connect the hydraulic inlet of the flow divider valve to port A, the hydraulic outlet of the flow divider valve to the branch servo mechanism to port C, and the hydraulic outlet of the flow divider valve to the main servo mechanism to port B; close port D, open the two-position two-way directional valves YV4, YV7, and YV8, and close the electrically controlled two-position two-way directional valves YV5 and YV9; adjust the input pressure of the proportional pressure reducing valve YV2, and adjust the flow rate of port C and port B respectively through the throttle valves YV6, YV10, and YV11; pressure sensors SP1 and SP2 measure the pressure of the two outlets, and flow meters SQ1 at port B and SQ2 at port C measure the flow rate of the two outlets to complete the rated flow rate, rated pressure, and flow divider ratio test; Combined valve block test mode: Connect the hydraulic inlet of the combined valve block, which includes an oil filter, flow divider valve, pressure reducing valve, high-pressure safety valve, and medium-pressure safety valve, to port A; connect the parallel hydraulic outlets of the high-pressure safety valve and the medium-pressure safety valve to port D; connect the hydraulic outlet of the flow divider valve leading to the branch servo mechanism to port C; and connect the hydraulic outlet of the flow divider valve leading to the main servo mechanism to port B. Adjust the input pressure through the proportional pressure reducing valve YV2, and adjust the throttle valves YV6, YV10, and YV11 to make the flow rates at ports C and B reach the rated values. Measure the overflow flow rate of the safety valve through the flow meter SQ3 at port D to complete the tests on the total flow rate of the combined valve block, the pressure and flow rate of each output branch, and the opening characteristics of the safety valve.

4. The test method according to claim 3, characterized in that, In the flow divider test mode, the specific steps for the flow divider ratio test are as follows: keep the total input flow rate at the rated value, adjust the throttle valves YV6, YV10 and YV11 to make the readings of pressure sensor SP1 and pressure sensor SP2 equal, then read the flow values ​​of flow meter SQ1 at port B and flow meter SQ2 at port C, calculate the ratio of the two flow rates and compare it with the design requirement value.

5. The test method according to claim 3, characterized in that, During the test preparation and test completion phases, first open the two-position two-way directional valves YV12 and YV13 to provide oil buffer protection for the C-port flow meter SQ2 and the B-port flow meter SQ1.

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