A multi-load working condition digital multi-way valve simulation installation performance test bench

Abstract

The utility model discloses a kind of digital multiway valve simulation installation performance test bench of multiple load working condition, including load mechanism, balance valve, the digital valve of being tested, hydraulic station and support, the digital valve of being tested is connected between hydraulic station and load mechanism by pipeline, and the digital valve of being tested is installed on support;The load mechanism includes load frame, hydraulic cylinder, limit support, rotating shaft and base, and load frame is rotatably connected by rotating shaft and base, and load frame can rotate around rotating shaft;The balance valve is set on the base and is close to the place of hydraulic oil cylinder;The output end of the digital valve of being tested is connected balance valve, and the hydraulic cylinder of load mechanism is connected to balance valve output end;The load mechanism, balance valve, the digital valve of being tested, hydraulic station are formed closed hydraulic circuit by pipeline.The utility model realizes multiple working condition loading, guarantees system stability, provides data support for product promotion.

Description

Technical Field

[0001] This utility model belongs to the field of engineering machinery technology, and in particular, relates to a multi-load condition digital multi-way valve simulation installation performance test bench. Background Technology

[0002] Digital multi-way valves, as core control components of hydraulic systems, are widely used in construction machinery (such as excavators and loaders), agricultural machinery, and industrial automation equipment. Their function is to precisely control the direction, speed, and pressure of multiple actuators via electrical signals. With the development of intelligent and automated technologies, digital multi-way valves need to meet higher control precision, faster response speeds, and more complex operating condition adaptability requirements. For example, in new energy mining equipment, digital multi-way valves need to achieve functions such as multi-pump confluence and load-sensitive control to improve energy efficiency and operational efficiency. A simulated installation performance test bench was built for digital multi-way valves to test their performance compared to ordinary proportional multi-way valves under various load conditions, such as control precision, rapid response, smoothness, and operating comfort. This provides performance data for the promotion of digital multi-way valves to end users.

[0003] In existing technologies, hydraulic valve test benches are mainly divided into factory test benches and type test benches. Factory test benches primarily test the most basic factory performance parameters of hydraulic multi-way valves, such as rated flow rate, rated pressure, relief valve pressure regulation, leakage, and oil seepage. Type test benches test a wider range of items, such as dynamic response characteristics, hysteresis characteristics, ultra-high pressure, and durability tests. However, existing test benches can only simulate static or simple dynamic working conditions (such as fixed pressure loading), making it difficult to reproduce complex scenarios in actual operation, such as high-frequency impacts and multi-actuator coordinated loads. Some test benches can only test pressure loss or flow rate, and cannot simultaneously collect key indicators such as leakage, response time, and hysteresis, affecting comprehensive performance evaluation. Furthermore, existing hydraulic valve test benches cannot perform multiple performance tests, such as output accuracy testing, dynamic response testing, static output testing, and dual-cylinder synchronization testing.

[0004] Existing patent publication number CN119641754A discloses a digital multi-way valve test bench and a method for verifying the performance of a digital multi-way valve. The digital multi-way valve test bench provided in this application includes a drive module and a verification module; the drive module includes a DC speed-regulating motor; the digital multi-way valve under test is mounted on the verification module, and multiple sensors are mounted on the digital multi-way valve under test; the verification module includes a pressure switching circuit, a loading bridge circuit, and a back pressure loading circuit; multiple oil inlets of the digital multi-way valve under test are connected to multiple series connection points of the pressure switching circuit; the first parallel connection point and the second parallel connection point of the loading bridge circuit are connected to the first oil inlet and the second oil inlet of the digital multi-way valve under test; and the back pressure loading circuit is connected to the oil inlet of the digital multi-way valve under test. However, this patent mainly targets independent pressure regulation of single or multiple oil ports, focusing on verifying the performance of digital multi-port valves under different pressure parameters (such as pressure resistance and flow control accuracy). It cannot simulate working conditions in complex scenarios such as multi-actuator collaborative operation (such as synchronous extension and retraction of dual cylinders) and asymmetrical loads (such as positive load on one side and negative load on the other side). It also lacks the ability to simulate such actual mechanical loads (especially negative loads and dynamic inertial loads), and the test scenarios have a low degree of consistency with the actual installation environment. Utility Model Content

[0005] This invention primarily addresses the limitations of existing test benches, which can only simulate static or simple dynamic conditions (such as fixed pressure loading) and struggle to reproduce complex scenarios in actual operation, such as high-frequency impacts and multi-actuator coordinated loads. Some test benches can only test pressure loss or flow rate, failing to simultaneously collect key indicators such as leakage, response time, and hysteresis, thus affecting comprehensive performance evaluation. Furthermore, existing hydraulic valve test benches cannot perform various performance tests, such as output accuracy testing, dynamic response testing, static output testing, and dual-cylinder synchronization testing. Therefore, this invention proposes a multi-load condition digital multi-way valve simulation installation performance test bench.

[0006] A multi-load condition digital multi-way valve simulation test bench includes a load mechanism, a balance valve, a digital valve under test (DVT), a hydraulic station, and a support. The DVT is connected to the hydraulic station and the load mechanism via pipelines and is mounted on the support for support. The load mechanism includes a load frame, a hydraulic cylinder, a limit frame, a rotating shaft, and a base. The load frame is rotatably connected to the base via the rotating shaft and can rotate around the rotating shaft. The balance valve is located on the base near the hydraulic cylinder. The output end of the DVT is connected to the balance valve, and the output end of the balance valve is connected to the hydraulic cylinder of the load mechanism. The load mechanism, balance valve, DVT, and hydraulic station form a closed hydraulic circuit through pipelines.

[0007] Furthermore, the hydraulic cylinder has a built-in displacement sensor for real-time detection of the displacement accuracy of the hydraulic cylinder.

[0008] Furthermore, the rotating shaft is fixedly mounted on the base, the cylinder body of the hydraulic cylinder is hinged to the base, and the piston rod of the hydraulic cylinder is hinged to the load frame, for driving the load frame to rotate around the rotating shaft.

[0009] Furthermore, the limiting frame is fixedly connected to the base and vertically installed on both sides of the load frame to limit the maximum rotation angle of the load frame. The load frame rotates around the rotation axis in the range of -30° to 30°. The range of 0° to 30° represents the load frame swinging to the left, and -30° to 0° represents the load frame swinging to the right. Swinging to the left indicates a positive load, while swinging to the right indicates an overload (i.e., a negative load), thus achieving four loading conditions: extended positive loading, extended negative loading, retracted positive loading, and retracted negative loading.

[0010] Furthermore, a maximum counterweight of 5 tons can be added to the load frame to simulate multi-level load conditions.

[0011] Furthermore, the hydraulic station includes a hydraulic oil tank, a motor pump unit, a louvered door, and a hydraulic output interface. The hydraulic station adopts an upper and lower structure arrangement. The hydraulic oil tank is located at the upper end of the motor pump unit, and the hydraulic oil tank and the motor pump unit are connected by pipelines. A liquid level sensor is installed on the top of the hydraulic oil tank.

[0012] Furthermore, the hydraulic output interface is located on the side of the hydraulic station and includes an oil inlet, an oil return port, and a load feedback port, which are respectively connected to the corresponding interface of the digital valve under test through pipelines.

[0013] Furthermore, the louvered door incorporates a radiator, a filter, and an overflow valve assembly.

[0014] Furthermore, the base of the hydraulic station is a flat plate structure with a buffer pad, which can be placed directly on a flat ground.

[0015] Furthermore, the bracket is a height-adjustable steel structure frame used to fix the load mechanism and adapt to hydraulic valves of different sizes.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] 1. This utility model includes a load mechanism, a balance valve, a digital valve under test (DVT), a hydraulic station, and a support. The DVT is installed between the hydraulic station and the load mechanism via a pipeline and is mounted on the support. The load mechanism includes a load frame, a hydraulic cylinder, a limit frame, a rotating shaft, and a base. The load frame is rotatably connected to the base via the rotating shaft and can rotate around the rotating shaft. The balance valve is located on the base near the hydraulic cylinder. This utility model can perform multi-load condition tests, including four conditions: positive loading with the hydraulic cylinder extended, negative loading with the cylinder extended, positive loading with the cylinder retracted, and negative loading with the cylinder retracted. It simulates the complex loads of actual engineering machinery operation (such as overload caused by gravity and inertia) in the test bench, making the test data closer to the performance of the installed machine.

[0018] 2. The output end of the tested digital valve of this invention is connected to a balance valve, and the output end of the balance valve is connected to the hydraulic cylinder of the load mechanism; the load mechanism, balance valve, tested digital valve, and hydraulic station form a closed hydraulic circuit through pipelines. This reduces pipeline length and lowers pressure fluctuations and response delays.

[0019] 3. This utility model can perform various performance tests, such as output accuracy test, dynamic response test, static output test, and dual-cylinder synchronization test. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0021] Figure 2 This is a schematic diagram of the load structure of this utility model;

[0022] Figure 3 This is a schematic diagram of the hydraulic station structure of this utility model.

[0023] In the above figure, 1. Load frame; 2. Hydraulic cylinder; 3. Limiting frame; 4. Rotating shaft; 5. Base; 6. Balance valve; 7. Test digital valve; 8. Bracket; 9. Hydraulic oil tank; 10. Motor pump set; 11. Louvered door; 12. Hydraulic output interface; 13. Liquid level sensor; 14. Hydraulic station. Detailed Implementation

[0024] To clearly illustrate the technical features of this utility model, the following detailed description is provided through specific embodiments and in conjunction with the accompanying drawings.

[0025] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0026] Furthermore, in the description of this utility model, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0027] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0028] In this utility model, unless otherwise expressly specified and limited, the first feature "on" or "below" the second feature may be in direct contact with the first and second features, or indirect contact through an intermediate medium. In the description of this specification, references to terms such as "an embodiment," "some embodiments," "example," "specific example," or "some examples" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this utility model. 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.

[0029] Example 1

[0030] like Figure 1As shown, a multi-load condition digital multi-way valve simulation installation performance test bench includes a load mechanism, a balance valve 6, a digital valve under test 7, a hydraulic station 14, and a support 8. The digital valve under test 7 is installed between the hydraulic station 14 and the load mechanism via pipelines and is mounted on the support 8 for support. The load mechanism includes a load frame 1, a hydraulic cylinder 2, a limit frame 3, a rotating shaft 4, and a base 5. The load frame 1 is rotatably connected to the base 5 via the rotating shaft 4 and can rotate around the rotating shaft 4. The balance valve 6 is located on the base 5 near the hydraulic cylinder 2. The output end of the digital valve under test 7 is connected to the balance valve 6, and the output end of the balance valve 6 is connected to the hydraulic cylinder 2 of the load mechanism. The load mechanism, balance valve 6, digital valve under test 7, and hydraulic station 14 form a closed hydraulic circuit through pipelines.

[0031] In this embodiment, the overall structural layout of the present invention is as follows: Figure 1 As shown, the system includes a load mechanism, a balance valve 6, a digital multi-way valve under test (DMP), a support 8, and a hydraulic station 14, all connected sequentially via pipelines. The balance valve 6 prevents the load mechanism from stalling during movement. It is directly mounted on the crossbeam of the load mechanism and positioned near the hydraulic cylinder 2 for easy pipeline connection. The inlet, return, and load feedback pipes of the hydraulic station 14 are directly connected to the DMP 7. The output of the DMP 7 is connected to the balance valve 6. The DMP 7, balance valve 6, hydraulic station 14, and hydraulic cylinder 2 are connected to form a complete hydraulic circuit.

[0032] like Figure 2 As shown, the load mechanism consists of a load frame 1, a hydraulic cylinder 2, a limiting frame 3, a rotating shaft 4, and a base 5. A load can be added to the load frame 1 via hydraulic cylinder loading, with a maximum load capacity of 5 tons. In this embodiment, the load frame 1 is hinged to the steel base 5 via the rotating shaft 4. The cylinder body of the hydraulic cylinder 2 is hinged to the base 5, and the piston rod of the hydraulic cylinder 2 is hinged to the load frame 1, driving the load frame to rotate around the rotating shaft. The limiting frame 3 is fixedly connected to the base 5 and vertically installed on both sides of the load frame 1, limiting the maximum rotation angle of the load frame 1. The rotation angle range of the load frame 1 around the rotating shaft is -30° to 30°. Here, 0° to 30° represents the load frame swinging to the left, and -30° to 0° represents the load frame swinging to the right. Swinging to the left indicates a positive load, and swinging to the right indicates an overload (i.e., a negative load), enabling four loading conditions: extended positive loading, extended negative loading, retracted positive loading, and retracted negative loading. The limit bracket 3 is used to limit the load frame 1, making the equipment swing more safely and stably. The base 5 is installed on the ground with anchor bolts, which is safe and reliable. The hydraulic cylinder 2 has a built-in displacement sensor, which can detect the displacement accuracy of the cylinder in real time, providing data support for judging the performance of the tested digital multi-way valve.

[0033] like Figure 2As shown, the balance valve 6 is directly fixed to the crossbeam of the load mechanism base with bolts, ≤200mm from the oil port of the hydraulic cylinder 2. The balance valve 6 is connected to the rodless chamber of the hydraulic cylinder 2 through a high-pressure hose to suppress the pressure impact when the load frame 1 swings. In this embodiment, the tested digital valve 7 is mounted on the bracket 8, and its oil inlet, oil return, and load feedback port are respectively connected to the corresponding interfaces of the hydraulic station 14 through pipelines.

[0034] like Figure 3 As shown, the hydraulic station 14 adopts an integrated design with an upper and lower structure. The hydraulic oil tank 9 is located above the motor pump unit 10 to ensure smoother oil suction. A level sensor 13 is installed on the hydraulic oil tank 9. Other hydraulic components, such as the radiator, filter, and overflow valve assembly, are arranged inside the louvered door 2. The overall structure is compact and easy to transport. The hydraulic output interface 12 includes an inlet, a return port, and a load feedback port, which are directly connected to the tested digital valve 7 via pipelines, offering convenience and simplicity. The base of the hydraulic station 14 adopts a buffered flat plate structure, allowing it to be placed directly on a flat surface without the need for fixing, making installation convenient.

[0035] The working principle is as follows: During the extension positive load test, the load frame 1 is controlled to rotate around the rotation axis from 0 to 30° (left swing). At this time, the gravity of the load frame 1 forms a positive resistance to the oil cylinder (which needs to be overcome by the output thrust of the oil cylinder); the hydraulic station 14 is started, and the oil pump outputs high-pressure oil through the tested digital valve 7 into the rodless chamber of the hydraulic cylinder 2. The displacement sensor collects the extension displacement of the hydraulic cylinder 2 in real time, and the pressure sensor records the pressure change at the oil inlet. The flow control accuracy of the digital valve under positive load is tested.

[0036] Extended negative load test: Control the load frame 1 to rotate from -30° to 0 (right swing), the load frame 1 forms an overload of "pulling" the oil cylinder due to gravity; the tested digital valve 7 adjusts the return oil flow, and the balance valve 6 controls the extension speed of the oil cylinder in real time to test the anti-stall capability of the digital valve under negative load.

[0037] Retraction positive / negative load: Similarly, by swinging the load box 1 left / right, the positive resistance and overload when the hydraulic cylinder 2 retracts are simulated, and the response delay time and pressure change of the digital valve are recorded.

[0038] This embodiment can reproduce four typical load conditions of digital multi-way valves. The control accuracy of digital multi-way valves is significantly improved compared with traditional type test benches, and the deviation between dynamic response data and actual installation test is reduced.

[0039] Example 2

[0040] like Figure 1As shown, a multi-load condition digital multi-way valve simulation installation performance test bench includes a load mechanism, a balance valve 6, a digital valve under test 7, a hydraulic station 14, and a support 8. The digital valve under test 7 is installed between the hydraulic station 14 and the load mechanism via pipelines and is mounted on the support 8 for support. The load mechanism includes a load frame 1, a hydraulic cylinder 2, a limit frame 3, a rotating shaft 4, and a base 5. The load frame 1 is rotatably connected to the base 5 via the rotating shaft 4 and can rotate around the rotating shaft 4. The balance valve 6 is located on the base 5 near the hydraulic cylinder 2. The output end of the digital valve under test 7 is connected to the balance valve 6, and the output end of the balance valve 6 is connected to the hydraulic cylinder 2 of the load mechanism. The load mechanism, balance valve 6, digital valve under test 7, and hydraulic station 14 form a closed hydraulic circuit through pipelines.

[0041] In this embodiment, the accuracy of a digital multi-way valve (dual working link) for a certain type of crane telescopic boom in controlling the synchronous extension and retraction of two hydraulic cylinders was tested, simulating the synchronous performance of the telescopic boom under horizontal / tilted working conditions.

[0042] In this embodiment, two sets of load mechanisms are symmetrically arranged, with a two-ton counterweight added to each load frame 1. The rotating shaft 4 is connected by a coupling for synchronous linkage, ensuring the consistency of the load on both cylinders. The two hydraulic cylinders 2 are of the same model and have built-in grating displacement sensors with an accuracy of ±0.05mm. The two hydraulic cylinders 2 are respectively connected to the tested digital valve 7 through a balance valve 6, and the cylinder extension and retraction signals are connected to the same data acquisition system.

[0043] The hydraulic station 14 uses a large-displacement variable pump to meet the flow requirements of simultaneous operation of the two cylinders; the radiator power is increased to 8kW to avoid oil temperature rise caused by continuous synchronous testing.

[0044] The test process is as follows: both load frames 1 are in the horizontal (0°) position. The tested digital valve 7 outputs a synchronous control signal to drive both cylinders to extend simultaneously. The maximum synchronous error within a 500mm stroke is recorded. The left load frame 1 is controlled to swing to 10° (positive load) and the right load frame 1 is controlled to swing to -10° (negative load) to simulate the tilting condition of the telescopic boom and test the synchronous compensation capability of the two cylinders under asymmetrical load.

[0045] The test bench in this embodiment can effectively simulate the dual-cylinder composite load condition, improve the consistency between the synchronization accuracy test data of the digital multi-way valve and the actual hoisting test, and provide key parameters for the design of the telescopic boom structure.

[0046] Example 3

[0047] like Figure 1As shown, a multi-load condition digital multi-way valve simulation installation performance test bench includes a load mechanism, a balance valve 6, a digital valve under test 7, a hydraulic station 14, and a support 8. The digital valve under test 7 is installed between the hydraulic station 14 and the load mechanism via pipelines and is mounted on the support 8 for support. The load mechanism includes a load frame 1, a hydraulic cylinder 2, a limit frame 3, a rotating shaft 4, and a base 5. The load frame 1 is rotatably connected to the base 5 via the rotating shaft 4 and can rotate around the rotating shaft 4. The balance valve 6 is located on the base 5 near the hydraulic cylinder 2. The output end of the digital valve under test 7 is connected to the balance valve 6, and the output end of the balance valve 6 is connected to the hydraulic cylinder 2 of the load mechanism. The load mechanism, balance valve 6, digital valve under test 7, and hydraulic station 14 form a closed hydraulic circuit through pipelines.

[0048] This embodiment tests the performance of a high-precision proportional valve. A 2-ton counterweight is added to load frame 1, and the rotation angle of load frame 1 around rotation axis 4 is limited to ±20°. Hydraulic cylinder 2 has a built-in displacement sensor. The tested proportional multi-way valve is connected to the corresponding interface of hydraulic station 14 via a conversion connector. Its load feedback port is connected to the feedback pipeline of hydraulic station 14 via a solenoid valve (response time ≤10ms) to achieve on / off control of the load feedback.

[0049] The motor pump set is configured as follows: a metering pump (displacement 25mL / r) driven by an 11kW motor, an overflow valve set with an LS feedback pressure range of 5~20MPa, and a filter accuracy of 20μm to meet the low contamination sensitivity requirements of the proportional valve.

[0050] The test procedure is as follows: Load box 1 is swung 15° to the left (positive load), the proportional valve receives an electrical signal to control the extension of the lifting arm, and the pressure sensor synchronously collects the inlet pressure and the load feedback port pressure, calculates the load feedback pressure difference, and verifies the pressure difference stability of the proportional valve when the load changes. Load box 1 is swung 10° to the right (negative load), the solenoid valve disconnects the LS feedback, and the flow rate attenuation rate of the proportional valve is tested when there is no load feedback.

[0051] The test bench can accurately simulate load feedback conditions, and the LS characteristic test data of the proportional valve has a small deviation from that of the dedicated test bench, while the test efficiency is significantly improved.

[0052] Obviously, the above-described embodiments are merely examples for clearly illustrating the present invention and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A multi-load condition digital multi-way valve simulation installation performance test bench, characterized in that, The system includes a load mechanism, a balance valve, a digital valve under test (DVT), a hydraulic power unit, and a support. The DVT is connected to the hydraulic power unit and the load mechanism via a pipeline and is mounted on the support. The load mechanism includes a load frame, a hydraulic cylinder, a limit frame, a rotating shaft, and a base. The load frame is rotatably connected to the base via the rotating shaft and can rotate around the rotating shaft. The balance valve is located on the base near the hydraulic cylinder. The output end of the DVT is connected to the balance valve, and the output end of the balance valve is connected to the hydraulic cylinder of the load mechanism. The load mechanism, balance valve, DVT, and hydraulic power unit form a closed hydraulic circuit through pipelines.

2. The multi-load condition digital multi-way valve simulation installation performance test bench according to claim 1, characterized in that, The hydraulic cylinder has a built-in displacement sensor for real-time detection of the displacement accuracy of the hydraulic cylinder.

3. The multi-load condition digital multi-way valve simulation installation performance test bench according to claim 1, characterized in that, The rotating shaft is fixedly mounted on the base, the cylinder body of the hydraulic cylinder is hinged to the base, and the piston rod of the hydraulic cylinder is hinged to the load frame, which is used to drive the load frame to rotate around the rotating shaft.

4. The multi-load condition digital multi-way valve simulation installation performance test bench according to claim 1, characterized in that, The limiting frame is fixedly connected to the base and is vertically installed on both sides of the load frame to limit the maximum flip angle of the load frame. The load frame rotates around the rotation axis in the range of -30° to 30°.

5. The multi-load condition digital multi-way valve simulation installation performance test bench according to claim 1, characterized in that, A maximum of 5 tons of counterweight can be added to the load frame to simulate multi-level load conditions.

6. The multi-load condition digital multi-way valve simulation installation performance test bench according to claim 1, characterized in that, The hydraulic station includes a hydraulic oil tank, a motor pump unit, a louvered door, and a hydraulic output interface. The hydraulic station adopts an upper and lower structure. The hydraulic oil tank is located at the upper end of the motor pump unit, and the hydraulic oil tank and the motor pump unit are connected by pipelines. A liquid level sensor is installed on the top of the hydraulic oil tank.

7. The multi-load condition digital multi-way valve simulation installation performance test bench according to claim 6, characterized in that, The hydraulic output interface is located on the side of the hydraulic station and includes an oil inlet, an oil return port, and a load feedback port, which are respectively connected to the corresponding interface of the digital valve under test through pipelines.

8. The multi-load condition digital multi-way valve simulation installation performance test bench according to claim 6, characterized in that, The louvered door has a built-in radiator, filter, and overflow valve assembly.

9. The multi-load condition digital multi-way valve simulation installation performance test bench according to claim 1, characterized in that, The base of the hydraulic station is a flat plate structure with a buffer pad, which can be placed directly on a flat ground.

10. The multi-load condition digital multi-way valve simulation installation performance test bench according to claim 1, characterized in that, The bracket is a height-adjustable steel frame used to fix the load mechanism and adapt to hydraulic valves of different sizes.

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