Adapter block and test device for pressure resistance test of hydraulic valve

Abstract

The utility model discloses an adapter block and a test device for a pressure test of a hydraulic valve, and belongs to the technical field of valve test tools, a first end face of the adapter block is inwards provided with a plurality of branch holes, the plurality of branch holes are respectively used for butting and communicating with an inlet and an outlet of liquid in the hydraulic valve, and at least one branch hole is used for blocking a channel during the pressure test; a butt joint opening is formed in the second end face of the switching block, the butt joint opening is used for being in butt joint and communicating with a liquid supercharging device, and in the switching block, the butt joint opening communicates with the multiple branch holes, so that liquid can flow between the butt joint opening and the inlet and outlet through the branch holes. The test device comprises the switching block, a connecting pipe and a protection box. According to the invention, the method does not depend on customized hydraulic equipment with high cost any more, connection and disconnection of an inlet and an outlet of the hydraulic valve during the test are realized by plugging the branch holes, and the pressure test can be carried out by using the switching block for connection, so that the pressure test process is simplified, the test is rapidly carried out, the design iteration process is accelerated, and rapid quality inspection of large-batch hydraulic valves is facilitated.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of valve testing tools, and particularly relates to an adapter block for hydraulic valve pressure resistance test and a test device. BACKGROUND

[0002] In order to verify the reliability of the hydraulic valve in the long-term use, the pressure resistance test is an essential test item in the type test and the factory inspection of the hydraulic valve. The pressure resistance test is to test the sealing performance, structural integrity and safety performance of the hydraulic valve under a certain pressure, so as to ensure that the hydraulic valve can meet the design requirements and use conditions in actual application. The pressure resistance test can fully verify the structural design reliability, manufacturing process reliability and performance reliability of the hydraulic valve itself.

[0003] At present, the pressure resistance test device of the hydraulic valve is complex, a large number of sensors, signal generating and adjusting devices, stop valves, overflow valves and the like are needed in the test circuit, the design is complex, the cost is high, and the operation of testing a single hydraulic valve is complex and long, which is difficult to quickly realize the verification in the product research and development stage, and also prolongs the overall time length of the factory inspection of a large number of products. Although the pressure resistance test device can simplify the test process to a certain extent, the test process is not convenient, and the standard pressure resistance test of the hydraulic valve cannot be completed by only one device, and different devices or parts need to be replaced to complete the test. Therefore, in order to improve the production efficiency, an effective solution is urgently needed. CONTENT OF THE INVENTION

[0004] The application aims to at least solve the technical problem of facilitating the pressure resistance test to a certain extent. To this end, the application provides an adapter block for hydraulic valve pressure resistance test and a test device, which can simplify the pressure resistance test process of the hydraulic valve, quickly test and speed up the design iteration process, and is beneficial to realize the rapid quality inspection of a large number of hydraulic valves.

[0005] In the first aspect, the application provides an adapter block for hydraulic valve pressure resistance test. A plurality of branch holes are formed in the first end surface of the adapter block, and the plurality of branch holes are respectively used for connecting and communicating with the inlet and outlet of the liquid in the hydraulic valve. At least one branch hole is used for plugging itself during the pressure resistance test. An adapter port is formed in the second end surface of the adapter block, and the adapter port is used for connecting and communicating with the liquid pressure increasing device. In the adapter block, the adapter port and the plurality of branch holes are communicated, so that the liquid can flow between the adapter port and the inlet and outlet through the branch holes.

[0006] In some embodiments, the adapter block is provided with at least one plugging piece, and the plugging piece is used for connecting and plugging one branch hole during the pressure resistance test.

[0007] In some embodiments, the branch hole connected with the plugging piece is a variable-diameter hole, the hole diameter of the variable-diameter hole near the first end surface is greater than the hole diameter in the adapter block, and the plugging piece is matched with the variable-diameter hole.

[0008] In some embodiments, the plugging member is threadedly matched with the variable-diameter hole, and the plugging member is further provided with an operating port for clamping a screwing tool.

[0009] In some embodiments, the length of the plugging member threadedly matched with the variable-diameter hole is greater than or equal to 8 mm.

[0010] In some embodiments, the plugging member is provided with a sealing ring arranged in a gap between the plugging member and the variable-diameter hole.

[0011] In some embodiments, the roughness of the first end surface is less than or equal to 0.8 um.

[0012] In some embodiments, the flatness of the first end surface is less than or equal to 0.01 mm.

[0013] In some embodiments, the diameter of the branch hole on the first end surface is less than or equal to the diameter of the corresponding inlet / outlet port.

[0014] In some embodiments, the inside of the adapter block is provided with a grid cavity, and the grid cavity is independent of the branch holes and the docking port.

[0015] In some embodiments, the adapter block is further provided with a transition channel, one end of the transition channel being in communication with the plurality of branch holes, and the other end being in communication with the docking port.

[0016] In some embodiments, the adapter block is further provided with a mounting hole penetrating through the first end surface and / or the second end surface, and the mounting hole is used for docking and fixing with the hydraulic valve.

[0017] In some embodiments, the hydraulic valve is provided with four inlet / outlet ports: an oil inlet port, an oil return port, and two control oil ports, and the adapter block is provided with four branch holes, three of which are used for docking with the two control oil ports and the oil inlet port, and one of which is used for docking with the oil return port.

[0018] In a second aspect, the embodiments of the present application provide a test device, which comprises the adapter block for hydraulic valve pressure test, a connecting pipe, and a protective box, one end of the connecting pipe being connected to the docking port, and the protective box being arranged around the adapter block and the hydraulic valve.

[0019] According to the above technical solution, the present application has the following beneficial effects:

[0020] 1. The adapter block of the application is connected between the hydraulic valve and the liquid pressure boosting device through the branch holes in the first end face and the connecting holes in the second end face, so that the flow channels in the hydraulic valve connected with the inlet and outlet are communicated through the branch holes, a standard pressure test path is formed, when another working condition of the standard pressure test is needed, one of the branch holes is plugged, another pressure test path is formed, so that only one adapter block can complete two tests of the standard pressure test, the pressure test process of the hydraulic valve is simplified, the test is quickly performed, the design iteration process is accelerated, and rapid quality inspection of a large number of hydraulic valves is facilitated.

[0021] 2. The test device of the application can form a connection between the hydraulic valve and the liquid pressure boosting device through the adapter block, the pressure test process is simplified by using the adapter block, the hydraulic valve and the adapter block are protected outside the protection box, leakage and spatter in the test process are prevented, external environment interference on the test is also reduced, data accuracy is ensured, and rapid and stable pressure test is facilitated. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the application, the drawings needed in the embodiment description will be simply introduced one by one below, and obviously, the drawings in the following description are some embodiments of the application, and other embodiments and drawings can also be obtained by those skilled in the art without creative labor on the basis of the drawings. In the drawings, various schematic diagrams according to the embodiments of the application are shown, which are not necessarily drawn to scale, some details are exaggerated for the purpose of clear expression, and some details can be omitted.

[0023] Figure 1 An embodiment use state schematic diagram of the adapter block for hydraulic valve pressure test of the utility model is shown;

[0024] Figure 2 An embodiment cross-sectional principle schematic diagram of the adapter block for hydraulic valve pressure test of the utility model is shown;

[0025] Figure 3 An embodiment top view schematic diagram of the adapter block for hydraulic valve pressure test of the utility model is shown;

[0026] Figure 4 An embodiment A-A cross-sectional schematic diagram of the adapter block for hydraulic valve pressure test of the utility model is shown;

[0027] Figure 5 An embodiment two A-A cross-sectional schematic diagram of the adapter block for hydraulic valve pressure test of the utility model is shown;

[0028] Figure 6 Embodiment three of the adapter block for hydraulic valve pressure test of the utility model is shown in the A-A cross-sectional view schematic diagram;

[0029] Figure 7 Embodiment of the utility model test device is shown in the use schematic diagram;

[0030] Reference signs: 100, adapter block; 101, first end face; 102, second end face; 103, branch hole; 104, butt joint; 105, transition channel; 106, mounting hole; 107, grid cavity; 110, plugging element; 111, operation port; 112, sealing ring; 200, hydraulic valve; 201, inlet and outlet; 300, connecting pipe; 400, protective box. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings corresponding to the specific embodiments of the present application, and the detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the present application claimed, and the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, various different configurations can be arranged and designed, and all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0032] The present application will be described below in combination with the drawings and with reference to specific embodiments:

[0033] Please refer to Figure 1 and Figure 2The first aspect of the present application provides a switching block 100 for hydraulic valve pressure test. A plurality of branch holes 103 are formed in the first end surface 101 of the switching block 100, i.e. the branch holes 103 are formed in the interior of the switching block 100 from the first end surface 101. The plurality of branch holes 103 are respectively used for connecting and communicating with the inlet and outlet 201 of the liquid in the hydraulic valve 200. At least one branch hole 103 is used for plugging the channel in the hole itself during the pressure test. The plugging can be achieved in different ways, such as using a plugging piece 110, sealing glue or a sealing plug to plug the branch hole 103, close the channel of the branch hole 103. When the plugging piece 110 is used, the plugging piece 110 can be locked and fixed with the branch hole 103, such as threaded matching connection, or locking screws are installed between the plugging piece 110 and the switching block 100. The second end surface 102 of the switching block 100 is provided with a connecting port 104, i.e. the connecting port 104 is formed in the interior of the switching block 100 from the second end surface 102. The first end surface 101 and the second end surface 102 are two opposite end surfaces of the switching block 100. The connecting port 104 is used for connecting and communicating with the liquid pressure boosting device. If the liquid pressure boosting device is an oil pump, the connecting port 104 serves as the oil inlet of the pump. The connecting port 104 is connected with the oil supply port of the oil pump through the joint of the oil inlet connecting pipe 300. The oil pump is a conventional hand pump. In the switching block 100, the connecting port 104 communicates with the plurality of branch holes 103. For example, the plurality of branch holes 103 can be connected and collected at one end and then communicated with the connecting port 104, so that the liquid can flow between the connecting port 104 and the inlet and outlet 201 through the branch holes 103. In this way, after being pressurized by the liquid pressure boosting device, the oil can enter the branch holes 103 from the connecting port 104 and then enter the inlet and outlet 201 of the hydraulic valve 200.

[0034] The prior art pressure test device can simplify the test process to a certain extent compared with the traditional test circuit device, but the test process is not convenient. This is because the pressure test of the hydraulic valve 200 needs to be tested according to the standard. Specifically, it is tested according to the two-step pressure test specified in the GB / T 15623.1, SAE ARP4493A or SAE ARP490G standard. In fact, it is a pressure test of the hydraulic valve 200 in two different paths. The hydraulic valve 200 generally has four inlets and outlets 201. Taking an electro-hydraulic servo valve as an example, the inlets and outlets 201 include an oil inlet, an oil return port and two control oil ports. During testing, oil pressure needs to be applied to the oil inlet, the oil return port and the two control oil ports for testing. Then, the oil return port is closed, and the pressure of the other oil ports is tested. The order of different standards is different. The existing device still cannot complete the standard pressure test of the hydraulic valve 200 by only one device, and different devices or parts need to be replaced to complete the test. The test process needs to be further simplified. The first end surface 101 of the present application is connected to the inlets and outlets 201 of the hydraulic valve 200 through the branch holes 103, and the second end surface 102 is connected to the liquid pressure boosting device through the connecting port 104. In this way, a connection is formed between the hydraulic valve 200 and the liquid pressure boosting device. The multiple branch holes 103 can communicate with the flow channels in the hydraulic valve 200 connected to the inlets and outlets 201, and a standard pressure test path is formed. When another working condition of the standard pressure test is needed, one of the branch holes 103 is plugged, and another pressure test path is formed. In this way, only one adapter block 100 is needed to complete the two tests of the standard pressure test, which can simplify the pressure test process of the hydraulic valve 200, quickly test, speed up the design iteration process, and is beneficial to realize the rapid quality inspection of a large number of hydraulic valves 200.

[0035] Please refer to Figure 2In some embodiments, the adapter block 100 is provided with at least one blocking piece 110, which corresponds to each branch hole 103 to be blocked. For example, if one branch hole 103 is to be blocked, one blocking piece 110 is used. The blocking piece 110 is used to connect and block the branch hole 103 during pressure test. The blocking piece 110 is a part that can block the branch hole 103 to close the internal passage. For example, the blocking piece 110 is a screw. The screw can be of M4, M5 or M6 specification. In some embodiments, the length of the blocking piece 110 that matches the thread of the variable-diameter hole is greater than or equal to 8 mm. For example, the length of the threaded section of the blocking piece 110 is 8 mm, 9 mm or 10 mm. The thickness of the first end surface 101 to the second end surface 102 of the corresponding adapter block 100 is at least 30 mm. This ensures that the blocking piece 110 does not fail after blocking the branch hole 103. The blocking piece 110 needs to be embedded in the branch hole 103 to avoid affecting the connection and communication of the branch hole 103 and the inlet and outlet 201 of the hydraulic valve 200. For example, the blocking piece 110 is a headless screw, and the branch hole 103 is provided with a matching internal thread. When testing is required, the headless screw can be screwed into the branch hole 103, thereby quickly realizing the on-off of the branch hole 103 and conducting pressure test of the blocked oil return port.

[0036] Please refer to Figure 3 and Figure 4 In some embodiments, the branch hole 103 connected to the blocking piece 110 is a variable-diameter hole. The diameter of the variable-diameter hole near the first end surface 101 is greater than the diameter of the variable-diameter hole inside the adapter block 100. The blocking piece 110 matches the variable-diameter hole, i.e., the opening end of the variable-diameter hole is larger than other parts, which is designed to accommodate the blocking piece 110. In some embodiments, the blocking piece 110 matches the thread of the variable-diameter hole. The blocking piece 110 is also provided with an operating port 111 for clamping into a tool for screwing. For example, the blocking piece 110 is a screw with an internal hexagonal hole, which is the operating port 111, facilitating the tool to screw. The head of the screw is relatively large. The rod part of the screw is matched with the inside of the variable-diameter hole, and the head of the screw is matched with the relatively large part of the variable-diameter hole. The length of the relatively large part of the variable-diameter hole is greater than the thickness of the head of the screw. In this way, the screw can be placed in the variable-diameter hole, avoiding affecting the connection of the hydraulic valve 200 and the adapter block 100. In some embodiments, the branch hole 103 can be designed in a curved shape, such as an arc shape. The design of the branch hole 103 only needs to ensure that it can function as a communication hole. In some embodiments, the blocking piece 110 is provided with a sealing ring 112, which seals the gap between the blocking piece 110 and the variable-diameter hole. The sealing ring 112 can be made of rubber or other materials. The sealing ring 112 is placed at the step between the head of the screw and the variable-diameter hole, ensuring that oil cannot pass through the branch hole 103 of the blocking piece 110.

[0037] In some embodiments, the roughness of the first end surface 101 is less than or equal to 0.8um, such as 0.8um, 0.6um, 0.5um, etc., and the roughness meets the requirements to ensure that the first end surface 101 is in close contact with the end surface of the hydraulic valve 200, and there is no oil leakage between the two; in some embodiments, the flatness of the first end surface 101 is less than or equal to 0.01mm, such as 0.01mm, 0.008mm or 0.005mm, and the hydraulic valve 200 also needs to have the above flatness requirement, so that the adapter block 100 and the hydraulic valve 200 can be in close contact after being connected, and each branch hole 103 corresponds to each inlet and outlet 201, avoiding oil leakage. The roughness and flatness of the first end surface 101 are designed according to the standard installation surface specifications in GB / T 2514, GB / T 8100, ISO 4401 and ISO 10372.

[0038] Please refer to Figure 5 In some embodiments, the aperture of the branch hole 103 located at the first end surface 101 is less than or equal to the aperture of the corresponding inlet and outlet 201, the opening of the branch hole 103 corresponds to the inlet and outlet 201 one by one, and the center position of the opening of the branch hole 103 coincides with the center position of the corresponding inlet and outlet 201, so that the oil coming out of the branch hole 103 can flow smoothly into the hydraulic valve 200, avoiding pressure build-up. In some embodiments, the adapter block 100 further comprises a transition channel 105, and a plurality of branch holes 103 are gathered at one end, which forms the transition channel 105, one end of the transition channel 105 communicates with the plurality of branch holes 103, and the other end communicates with the docking port 104. In some embodiments, the plurality of branch holes 103 can also be connected to the docking port 104 and communicate with each other, so that each branch hole 103 is connected to the docking port 104 separately, but the liquid pressure in the docking port 104 is equal when the liquid booster is working, and can enter the plurality of branch holes 103 at the same time.

[0039] Please refer to Figure 6In some embodiments, the inside of the adapter block 100 is provided with a grid cavity 107, which is independent of the branch holes 103 and the butt joint cavity 104. The grid cavity 107 is a hollow space inside the adapter block 100. In order to ensure the structural strength of the adapter block 100, a grid such as a bifurcated topological structure can be arranged inside the adapter block 100. The adapter block 100 can be formed by 3D printing. In this way, the structural strength of the adapter block 100 can be ensured, and the weight of the adapter block 100 can be reduced as much as possible. In some embodiments, the adapter block 100 is also provided with mounting holes 106 penetrating through the first end surface 101 and / or the second end surface 102. The mounting holes 106 are used for butt joint fixing with the hydraulic valve 200. For example, the mounting holes 106 are provided with four mounting holes, which are respectively located at the four corners of the adapter block 100. The mounting holes 106 are threaded holes. The mounting holes 106 penetrate through the first end surface 101 and the second end surface 102 at opposite positions. The bottom of the hydraulic valve 200 is also provided with four threaded holes at corresponding positions. In this way, four screws are inserted into the mounting holes 106 and the threaded holes of the hydraulic valve 200, so that the adapter block 100 can be fixed on the bottom of the hydraulic valve 200. The first end surface 101 of the adapter block 100 is tightly attached to the end surface of the inlet and outlet 201 of the hydraulic valve 200 after butt joint fixing.

[0040] In some embodiments, the hydraulic valve 200 is provided with four inlets and outlets 201, i.e., A, B, P and T. The adapter block 100 is provided with four branch holes 103. Three branch holes 103 are used for butt joint of the inlets and outlets 201 of A, B and P. One branch hole 103 is used for butt joint of the inlet and outlet 201 of T. For example, the hydraulic valve 200 has an oil inlet P, an oil return port T and two control oil ports A and B. At a certain position, P is in communication with A, and T is in communication with B. At this time, the actuator performs corresponding extension or retraction action. When the valve core moves to another position, P is in communication with B, and T is in communication with A. The action direction of the actuator also changes. After the adapter block 100 is installed with the hydraulic valve 200, the three branch holes 103 are respectively in butt joint and communication with the inlets and outlets 201 of A, B and P. The one branch hole 103 is a variable diameter hole and is in butt joint and communication with the inlet and outlet 201 of T. The variable diameter hole is blocked or opened by the above-mentioned blocking piece 110, so that the standard pressure test can be completed.

[0041] The pressure test steps of the present application include:

[0042] S1, the hydraulic valve 200 to be tested and adapter block 100 are fastened together by screws, oil is injected from the interface 104 using a syringe, the air inside the branch hole 103 of the hydraulic valve 200 and the adapter block 100 is removed, the interface 104 is connected to the pipe joint of the hand pump, the hydraulic valve 200 and the adapter block 100 are placed in the protective box 400, and oil is pumped at a rate limit value specified by the standard until the oil pressure gauge shows 1-1.3 times the operating pressure of the hydraulic valve 200, which is maintained for 30-120 seconds, and then the pressure is released and the adapter block 100 is disassembled.

[0043] S2, the sealing ring 112 is placed in the stepped position of the variable diameter hole, the screw of the T port plugging member 110 is screwed into the threaded section of the variable diameter hole, and is tightened until the sealing ring 112 is extruded and the torque reaches a specified value, the hydraulic valve 200 and the adapter block 100 are fastened together by screws, oil is injected from the interface 104 using a syringe, the air inside the branch hole 103 of the hydraulic valve 200 and the adapter block 100 is removed, the interface 104 is connected to the pipe joint of the hand pump, the hydraulic valve 200 and the adapter block 100 are placed in the protective box 400, and oil is pumped at a rate limit value specified by the standard until the oil pressure gauge shows 1.3-1.5 times the operating pressure of the hydraulic valve 200, which is maintained for 30-120 seconds, and then the pressure is released.

[0044] S3, whether there is external leakage during the pressure test is observed, and the hydraulic valve 200 is disassembled after the test to observe whether there is permanent deformation of the hydraulic valve 200.

[0045] In the test in the S1 stage, the spool of the hydraulic valve 200 is in the middle position, and in the test in the S2 stage, the spool of the hydraulic valve 200 is in the middle position or the position of the spool is controlled by an input signal to be in one end position of the valve for half the time and in the other end position for the other half of the time.

[0046] Please refer to Figure 7 The second aspect of the present application provides a test device, which comprises the adapter block 100 for the pressure test of the hydraulic valve 200, and the pipe 300 and the protective box 400, one end of the pipe 300 is connected to the interface 104, the joint at the end of the pipe 300 is provided with external threads, and the interface 104 is provided with internal threads, so that the pipe 300 is connected to the interface 104 in a rotating manner, the protective box 400 is arranged around the outer periphery of the adapter block 100 and the hydraulic valve 200, the protective box 400 can be made of iron sheet, plastic shell or other shell-shaped structure, a through hole is formed on one side of the protective box 400, the pipe 300 passes through the through hole to be connected to the interface 104, and the protective box 400 can prevent high-pressure oil from being sprayed. In an optional embodiment, the adapter block 100 is a block-shaped structure made of stainless steel, die steel or titanium alloy, and the adapter block 100 is formed by subtractive manufacturing including milling and drilling, or additive manufacturing including laser powder bed fusion.

[0047] The test device of the application can form a connection between the hydraulic valve 200 and the liquid pressure boosting device through the adapter block 100, and the pressure test process is simplified by using the adapter block 100. The hydraulic valve 200 and the outside of the adapter block 100 can be protected by the protective box 400 to prevent leakage and splashing during the test process, and the interference of the external environment on the test can also be reduced to ensure the accuracy of the data and help to perform the pressure test quickly and stably.

[0048] In the description of the application, the description of the terms "some embodiments", "optional embodiments", "examples", "specific examples", "optional examples" or "optional embodiments" means that the specific features, structures, materials or characteristics described in combination with the embodiments or examples are contained in at least one embodiment or example of the application, but do not mean that all possible forms of the application are described and described by these embodiments. In the specification, the illustrative description of the above terms is not necessarily directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in the specification.

[0049] In addition, the technical solutions of each embodiment can be combined with each other, but must be based on the realization of ordinary skilled in the art. Although the embodiments of the application have been shown and described, various changes, modifications, replacements and variations of these embodiments can be made without departing from the principles and purposes of the application. Those skilled in the art can understand that various other specific changes and combination embodiments can be made according to the technical inspiration disclosed in the application without departing from the essence of the application, and still within the protection scope of the claims of the application and equivalent technical solutions.

[0050] At the same time, the technical solutions of each embodiment can be combined with each other, but must be based on the realization of ordinary skilled in the art. When the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor is it within the protection scope required by the application.

Claims

1. An adapter block for hydraulic valve pressure testing, characterized by: The first end surface (101) of the adapter block (100) is internally provided with a plurality of branch holes (103), and the plurality of branch holes (103) are respectively used for connecting and communicating with the inlet and outlet (201) of the hydraulic valve (200) for liquid, and at least one branch hole (103) is used for plugging itself during pressure test. The second end surface (102) of the adapter block (100) is provided with a connecting port (104) for connecting and communicating with a liquid pressure boosting device. The connecting port (104) is in communication with the plurality of branch holes (103) in the adapter block (100), so that the liquid can flow between the connecting port (104) and the inlet and outlet (201) through the branch holes (103).

2. The adapter block for hydraulic valve pressure testing of claim 1, wherein, The adapter block (100) is provided with at least one plugging member (110) for connecting and plugging one branch hole (103) during pressure test.

3. The adapter block for hydraulic valve pressure testing of claim 2, wherein, The branch hole (103) connected with the plugging member (110) is a variable-diameter hole, and the hole diameter near the first end surface (101) is larger than the hole diameter inside the adapter block (100). The plugging member (110) is matched with the variable-diameter hole.

4. The adapter block for hydraulic valve pressure testing of claim 3, wherein, The plugging member (110) is threadedly matched with the variable-diameter hole, and the length of the thread matching between the plugging member (110) and the variable-diameter hole is greater than or equal to 8 mm.

5. The adapter block for hydraulic valve pressure testing of claim 4, wherein, The plugging member (110) is provided with a sealing ring (112) arranged between the plugging member (110) and the variable-diameter hole.

6. The hydraulic valve pressure test adapter of claim 1, wherein, The roughness of the first end surface (101) is less than or equal to 0.8 um, and the flatness of the first end surface (101) is less than or equal to 0.01 mm.

7. The hydraulic valve pressure test adapter of claim 1, wherein, The hole diameter of the branch hole (103) located on the first end surface (101) is less than or equal to the diameter of the corresponding inlet and outlet (201).

8. The hydraulic valve pressure test adapter of claim 1, wherein, The inside of the adapter block (100) is provided with a grid cavity (107), and the grid cavity (107) is independent of the branch holes (103) and the connecting port (104).

9. The adapter block for hydraulic valve pressure testing of any of claims 1-8, wherein: The hydraulic valve (200) is provided with four inlet and outlet ports (201), namely an oil inlet port, an oil return port and two control oil ports. The adapter block (100) is provided with four branch holes (103), three of which are used for connecting the two control oil ports and the oil inlet port, and one is used for connecting the oil return port.

10. A test device characterized by: The hydraulic valve pressure test adapter block of any one of claims 1-9, and a connecting pipe (300) and a protective box (400), one end of the connecting pipe (300) is connected to the connecting port (104), and the protective box (400) is arranged on the outer periphery of the adapter block (100) and the hydraulic valve (200).

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