A process for cleaning hydraulic oil remaining in a valve body after testing of a pilot valve

Abstract

The present application relates to the technical field of hydraulic equipment cleaning, and discloses a process method for cleaning residual hydraulic oil in a valve body after pilot valve testing, comprising the following steps: positioning and clamping the pilot valve using a clamping mechanism to simulate the working state of the pilot valve; connecting multiple oil paths of the pilot valve one by one through an oil suction mechanism to form a negative pressure environment; under the action of the negative pressure, the hydraulic oil in the pilot valve is sucked to a gas storage tank through the oil paths; the clamping is released after the oil suction is completed, and the cleaning process is ended, wherein the multiple oil paths include 1-T oil path, 1-P oil path, 2-T oil path, 2-P oil path, 3-T oil path, 3-P oil path, 4-T oil path and 4-P oil path. Through negative pressure oil suction, oil path sequential switching and automatic control, the present application realizes efficient cleaning of the hydraulic oil in the pilot valve, improves the cleaning efficiency, reduces the environmental impact and optimizes the operation process.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic equipment cleaning, in particular to a process method for cleaning hydraulic oil remaining in a valve body after a pilot valve is tested. Background Art

[0002] Hydraulic equipment is widely used in engineering machinery, industrial equipment, aerospace, and other fields. Pilot valves, as key components in hydraulic systems, have a direct impact on system efficiency and reliability. During production, pilot valves undergo rigorous hydraulic testing to verify their functionality and sealing. However, after hydraulic testing, residual hydraulic oil often remains inside the pilot valves. If this hydraulic oil is not thoroughly cleaned, it can leak out during product circulation and use, contaminating the environment and even affecting operational quality at the OEM assembly site.

[0003] Currently, high-pressure air purging is a common method for cleaning residual hydraulic oil after pilot valve testing. This method uses high-pressure airflow to impact the internal oil circuit, relying on the speed and pressure of the airflow to expel the hydraulic oil from the circuit. This method has certain advantages, such as simple equipment and ease of use, no need for complex cleaning equipment, and the ability to quickly remove surface hydraulic oil from the oil circuit. In mass production, this method meets basic cleaning needs and is therefore widely used.

[0004] However, the existing high-pressure air blowing method still has many problems. First, this method is not friendly to oil circuits with complex structures. For oil circuits blocked by plungers or valve cores, high-pressure air often cannot enter deep areas, resulting in the inability to completely clean up the hydraulic oil residue. Second, the operation process needs to be repeated, the cleaning efficiency is low, and the labor intensity is high. Third, the high-pressure airflow will atomize the hydraulic oil, forming a large amount of oil mist, polluting the air and the ground, and even posing a hidden danger to the health of the operator. In addition, the collision of the airflow and the oil circuit outlet generates a lot of noise, which not only affects the working environment, but also poses a threat to hearing health. Summary of the Invention

[0005] In response to the shortcomings of the existing technology, the present invention provides a process method for cleaning the hydraulic oil remaining in the valve body after the pilot valve is tested, which solves the problems of incomplete cleaning, low efficiency, oil mist pollution to the environment and high noise in the existing high-pressure air blowing to clean the residual hydraulic oil in the pilot valve.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: A process for cleaning hydraulic oil remaining in a valve body after a pilot valve test, comprising the following steps:

[0007] Use the clamping mechanism to position and clamp the pilot valve to simulate the working state of the pilot valve;

[0008] Multiple oil circuits of the pilot valve are connected one by one through the oil suction mechanism to form a negative pressure environment;

[0009] Under the action of negative pressure, the hydraulic oil in the pilot valve is sucked into the air storage tank through the oil circuit;

[0010] After the oil is sucked out, the clamp is released and the cleaning process is finished.

[0011] Preferably, the plurality of oil circuits include a 1-T oil circuit, a 1-P oil circuit, a 2-T oil circuit, a 2-P oil circuit, a 3-T oil circuit, a 3-P oil circuit, a 4-T oil circuit and a 4-P oil circuit.

[0012] Preferably, the oil suction mechanism comprises:

[0013] Vacuum pump, air storage tank and multiple air pipes corresponding to the oil circuit, including:

[0014] A vacuum pump connected to the gas storage tank to form a negative pressure;

[0015] An air storage tank connected to the air pipe and used to store the hydraulic oil drawn from the pilot valve;

[0016] The air pipe has two ends connected to the oil circuit of the pilot valve and the air storage tank, and is used to transport the hydraulic oil from the pilot valve to the air storage tank under the action of negative pressure.

[0017] Preferably, the air storage tank includes a first-level air storage tank and a second-level air storage tank. The first-level air storage tank is connected to the air pipe and is used to store most of the hydraulic oil drawn from the pilot valve. The second-level air storage tank is connected to the first-level air storage tank and the vacuum pump. At the same time, a filter assembly is provided between the second-level air storage tank and the first-level air storage tank for further filtering and storing a small amount of residual hydraulic oil.

[0018] Preferably, the negative pressure environment further includes an air filter, which is connected to the air pipe and is used to filter the air entering the pilot valve to ensure that the air entering the valve body is clean.

[0019] Preferably, the various parts of the negative pressure environment are connected via a quick-release interface, which facilitates cleaning and maintenance of the vacuum pump, gas tank and air pipe.

[0020] Preferably, the clamping mechanism includes:

[0021] Clamping body, clamping assembly, positioning assembly and simulation assembly, wherein:

[0022] The clamping body is used to support the clamping mechanism and provide space for supporting and installing subsequent components;

[0023] A clamping assembly, which is arranged on the outside of the clamp body and is used to push the positioning assembly to move up and down to achieve clamping and loosening of the pilot valve;

[0024] A positioning assembly is provided on the outside of the clamp body and is used to position the pilot valve and to seal the oil port of the pilot valve with the negative pressure environment;

[0025] The simulation component is arranged on the outside of the clamp body and presses and releases the plunger of the pilot valve in the form of extrusion to simulate the working state of the pilot valve.

[0026] Preferably, the clamping assembly includes a mounting plate 1 and a reinforcing plate 1, both of which are mounted on the outside of the clamp body through countersunk screws 2, and a cylinder 1 is mounted on the bottom of the mounting plate 1 through countersunk screws, and the output end of the cylinder 1 passes through the mounting plate 1.

[0027] Preferably, the positioning assembly includes a guide rail, which is fixedly connected to the outer side of the clamping body by a third countersunk screw, and a positioning plate is installed on the other side of the guide rail by a second threaded nail, and a passage plate is installed on the bottom of the positioning plate by a first threaded nail, and oil ports corresponding to multiple oil circuits are opened in the middle of the passage plate, and a seal is provided in each oil port, and a connecting block is installed on the bottom of the passage plate by a third threaded nail, and the bottom end of the connecting block is fixedly installed on the output end of the cylinder one.

[0028] Preferably, the simulation component includes a mounting plate 2 and a reinforcement plate 2, and the mounting plate 2 and the reinforcement plate 2 are both mounted on the outer side of the clamp body through a threaded nail 6, and the reinforcement plate 2 is mounted on the upper side of the mounting plate 2 through a threaded nail 5. The top of the mounting plate 2 is fixedly connected with a pad block, and the upper side of the pad block is mounted with a ferry plate through a threaded nail 4. The middle part of the ferry plate is mounted with a cylinder 2 through a hexagonal nut 1, and the output end of the cylinder 2 is mounted with a press joint through a hexagonal nut 2, and the press joint is plug-fitted with the plunger of the pilot valve.

[0029] The present invention provides a process for cleaning hydraulic oil remaining in a pilot valve body after testing. It has the following beneficial effects:

[0030] 1. This invention utilizes a simulation component to simulate the actual operating state of the pilot valve plunger. By precisely controlling the compression and release of the plunger, it achieves the individual switching of oil circuits. This approach not only thoroughly clears the hydraulic oil in all oil circuits but also avoids residual oil in the circuits. Compared to traditional high-pressure purge technology, this invention solves the long-standing problem of incomplete cleaning due to the inability to fully open the oil circuit.

[0031] 2、The present application combines negative pressure technology and sealing assembly, adopts vacuum pump connected with passage plate, and cleans oil way one by one under negative pressure environment. The oil way is sealed and connected tightly, ensures no leakage in oil absorption process, and has very high efficiency. The problems of loose oil way connection and poor sealing in traditional process do not occur here, and oil absorption efficiency and cleaning effect are significantly improved.

[0032] 3、Through circuit control, full automation of oil absorption process is realized, without manual intervention. In addition to hierarchical storage and filtration design, hydraulic oil is recycled, operation is simple and more environmentally friendly. The previous technology is highly dependent on manual operation and is prone to oil mist pollution of the environment. The present application completely avoids these troubles, and the cleaning process is efficient and healthy and friendly. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 The schematic diagram of the principle of the process method of the present application is shown in the figure;

[0034] Figure 2 The structure schematic diagram of the clamping mechanism of the present application is shown in the figure;

[0035] Figure 3 The structure schematic diagram of the cylinder one of the present application is shown in the figure;

[0036] Figure 4 The structure schematic diagram of the positioning assembly of the present application is shown in the figure;

[0037] Figure 5 The structure schematic diagram of the connecting block of the present application is shown in the figure;

[0038] Figure 6 The structure schematic diagram of the simulation assembly of the present application is shown in the figure;

[0039] Figure 7 The structure schematic diagram of the pressing joint of the present application is shown in the figure.

[0040] 1, clamp body; 2, clamping assembly; 2-1, cylinder one; 2-2, reinforcing plate one; 2-3, mounting plate one; 2-4, countersunk screw one; 2-5, countersunk screw two; 3, positioning assembly; 3-1, passage plate; 3-2, sealing element; 3-3, positioning plate; 3-4, threaded pin one; 3-5, threaded pin two; 3-6, countersunk screw three; 3-7, guide rail; 3-8, threaded pin three; 3-9, connecting block; 4, simulation assembly; 4-1, mounting plate two; 4-2, heightening block; 4-3, bridge plate; 4-4, threaded pin four; 4-5, cylinder two; 4-6, threaded pin five; 4-7, reinforcing plate two; 4-8, threaded pin six; 4-9, hexagonal nut one; 4-10, hexagonal nut two; 4-11, pressing joint. DETAILED DESCRIPTION

[0041] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the specification of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0042] Please see the attached Figure 1 -Attached Figure 7 The embodiment of the present invention provides a process for cleaning hydraulic oil remaining in a pilot valve body after testing, comprising the following steps:

[0043] Use the clamping mechanism to position and clamp the pilot valve to simulate the working state of the pilot valve. The clamping mechanism can be used to position, clamp, and switch the oil circuit of the pilot valve to ensure the sealing and reliability of the negative pressure oil suction process and avoid air leakage or oil circuit dislocation.

[0044] The oil suction mechanism connects multiple oil circuits of the pilot valve one by one to form a negative pressure environment. By connecting the oil circuits one by one and simulating switching, the hydraulic oil in each oil circuit is accurately cleaned under the action of negative pressure, avoiding the problem of incomplete cleaning caused by insufficient suction or opening multiple oil circuits at the same time.

[0045] Under the action of negative pressure, the hydraulic oil in the pilot valve is sucked into the air tank through the oil circuit. The graded storage and filtration of the air tank ensure that the hydraulic oil is completely extracted and effectively filtered. At the same time, the air in the oil circuit is kept clean to avoid contamination of the valve body or the environment.

[0046] After the oil is sucked out, the clamp is released and the cleaning process is finished.

[0047] Please see the attached Figure 1 In a preferred embodiment of the present invention, the multiple oil circuits include 1-T oil circuit, 1-P oil circuit, 2-T oil circuit, 2-P oil circuit, 3-T oil circuit, 3-P oil circuit, 4-T oil circuit and 4-P oil circuit. The setting of multiple oil circuits is used to clarify the classification and function of the oil circuits, ensure that each oil circuit is accurately switched according to the working status, and provide a technical basis for negative pressure oil suction.

[0048] Please see the attached Figure 1 In a preferred embodiment of the present invention, the oil suction mechanism comprises:

[0049] A vacuum pump, an air storage tank, and multiple air pipes corresponding to the oil circuits. The multiple air pipes are provided to ensure that each air pipe matches the corresponding oil circuit, thereby ensuring that the hydraulic oil can be smoothly sucked into the air storage tank through the negative pressure:

[0050] The vacuum pump is connected with the air tank to form negative pressure, and the negative pressure formed by the vacuum pump ensures efficient suction of the hydraulic oil and avoids incomplete cleaning caused by insufficient negative pressure.

[0051] The air tank is connected with the air pipe to store the hydraulic oil sucked from the pilot valve, and the partition design and filtering function of the air tank ensure effective storage and purification of the hydraulic oil, reduce equipment wear and tear, and realize resource recycling.

[0052] The air pipe is connected with the oil path of the pilot valve and the air tank at both ends to transport the hydraulic oil from the pilot valve to the air tank under the action of negative pressure, and through such arrangement, the hydraulic oil can be smoothly transmitted to avoid leakage or reduced oil suction efficiency.

[0053] Please refer to the accompanying drawings Figure 1 In a preferred embodiment of the present application, the air tank includes a primary air tank and a secondary air tank, the primary air tank is connected with the air pipe to store most of the hydraulic oil sucked from the pilot valve, the secondary air tank is connected with the primary air tank and the vacuum pump, and a filter assembly is arranged between the primary air tank and the secondary air tank to further filter and store a small amount of residual hydraulic oil. Through the functional partition of the primary air tank and the secondary air tank, the storage efficiency and cleanliness of the hydraulic oil are improved, impurities are prevented from polluting the system, and the hydraulic oil is prevented from directly entering the vacuum pump to cause equipment wear and tear.

[0054] Please refer to the accompanying drawings Figure 1 In a preferred embodiment of the present application, the negative pressure environment further includes an air filter connected with the air pipe to filter the air entering the pilot valve, so as to ensure that the air entering the valve body is clean. Through the structural design of the air filter, the air entering the pilot valve is ensured to be clean, the internal oil path or air tank of the valve body is prevented from being polluted, the cleanliness of the valve body is ensured, the influence of external pollution on the cleaning effect is prevented, the service life of the equipment is prolonged, the air filter is connected through a connecting disc and a tightening bolt, can be easily taken out from the shell and replaced, and the air filter is a prior art which will not be described in detail.

[0055] Please refer to the accompanying drawings Figure 1 In a preferred embodiment of the present application, the parts of the negative pressure environment are connected through quick disassembly interfaces, the quick disassembly interfaces facilitate cleaning and maintenance of the vacuum pump, the air tank and the air pipe, the quick disassembly interfaces are used to connect the vacuum pump, the air tank and the air pipe of the negative pressure environment, each interface is provided with a sealing gasket to ensure the sealing property of the connection under high negative pressure, the convenient connection and separation function of the quick disassembly interfaces improves the operation efficiency of the equipment and shortens the maintenance and repair time.

[0056] Please refer to the accompanying drawings Figure 1 - Figure 7 In a preferred embodiment of the present invention, the clamping mechanism comprises:

[0057] Clamp body 1, clamping component 2, positioning component 3 and simulation component 4, wherein:

[0058] Clamp body 1 is used to support the clamping mechanism and provide space for supporting and installing subsequent components. Clamp body 1 provides a solid and reliable support foundation to ensure the operational stability and installation convenience of the entire clamping mechanism;

[0059] The clamping assembly 2 is arranged on the outside of the clamp body 1 and is used to push the positioning assembly 3 to move up and down to achieve the clamping and loosening of the pilot valve. The clamping assembly 2 achieves a stable clamping and loosening of the pilot valve through the up and down movement function, ensuring the consistency of equipment operation;

[0060] The positioning component 3 is arranged on the outside of the clamp body 1 and is used to position the pilot valve and seal the oil port of the pilot valve with the negative pressure environment. The design of the positioning component 3 ensures that the pilot valve can be quickly connected to the oil circuit and air pipe after clamping, providing a basic guarantee for subsequent oil suction operations. The precise positioning and sealing design ensure the sealing and cleaning efficiency of the connection between the pilot valve and the negative pressure system.

[0061] The simulation component 4 is arranged on the outside of the clamp body 1, and presses and releases the plunger of the pilot valve by squeezing to simulate the working state of the pilot valve. The simulation component ensures that the oil circuit can be switched accurately by simulating the plunger action, providing the necessary conditions for the negative pressure oil suction operation.

[0062] Please see the attached Figure 2 and attached Figure 3 In a preferred embodiment of the present invention, the clamping assembly 2 includes a mounting plate 2-3 and a reinforcement plate 2-2. The mounting plate 2-3 and the reinforcement plate 2-2 are both mounted on the outside of the clamping body 1 by countersunk screws 2-5. A cylinder 2-1 is mounted on the bottom of the mounting plate 2-3 by countersunk screws 2-4. The output end of the cylinder 2-1 passes through the mounting plate 2-3. The stability of the mounting plate 2-3 is improved by the reinforcement plate 2-2, thereby ensuring the stability of the clamping assembly 2 on the outside of the clamping body 1. At the same time, it can effectively avoid deformation or loosening caused by vibration generated by the repeated operation of the cylinder 2-1, thereby ensuring the long-term stability of the assembly. The cylinder 2-1 realizes the up and down driving of the positioning assembly 3 through the telescopic action, thereby completing the clamping or loosening operation of the pilot valve for installation and disassembly of the pilot valve.

[0063] Please see the attached Figure 2 , Attachment Figure 4 and attached Figure 5In a preferred embodiment of the present invention, the positioning assembly 3 includes a guide rail 3-7, and the guide rail 3-7 is fixedly connected to the outer side of the clamp body 1 by a countersunk screw 3-6. The guide rail 3-7 is installed by the countersunk screw 3-6, which can improve the stability of the guide rail 3-7, thereby avoiding the problem of the guide rail 3-7 being offset, tilted and falling off when the positioning assembly 3 is in use, thereby improving the stability of the positioning assembly 3. A positioning plate 3-3 is installed on the other side of the guide rail 3-7 by a threaded nail 2-5, and a passage plate 3-1 is installed on the bottom of the positioning plate 3-3 by a threaded nail 1-4. The positioning plate 3-3 is installed on the guide rail 3-7 by the threaded nail 2-5, and can slide freely along the direction of the guide rail 3-7, ensuring that the passage plate The oil circuit docking position of 3-1 and the pilot valve is accurate to avoid operational errors. The middle part of the passage plate 3-1 is provided with oil ports corresponding to multiple oil circuits, and each oil port is provided with a seal 3-2. The multi-oil port design of the passage plate 3-1 and the sealing provided by the seal 3-2 ensure the connection reliability of the oil circuit and the stability of the negative pressure oil suction operation. The bottom of the passage plate 3-1 is installed with a connecting block 3-9 through a threaded nail 3-8. The bottom end of the connecting block 3-9 is fixedly installed at the output end of the cylinder 2-1. The cylinder 2-1 and the positioning component 3 can be quickly connected under the action of the threaded nail 3-8 and the connecting block 3-9, so that it drives the positioning component 3 to move during operation, thereby completing the alignment assembly of the device.

[0064] Please see the attached Figure 2 , Attachment Figure 6 and attached Figure 7 In a preferred embodiment of the present invention, the simulation component 4 includes a mounting plate 2 4-1 and a reinforcement plate 2 4-7. The mounting plate 2 4-1 and the reinforcement plate 2 4-7 are both mounted on the outside of the clamp body 1 through six screw nails 4-8. The reinforcement plate 2 4-7 is mounted on the upper side of the mounting plate 2 4-1 through five screw nails 4-6. The combined design of the mounting plate 2 4-1 and the reinforcement plate 2 4-7 enhances the rigidity of the overall structure and ensures the stability and durability of the simulation component 4 during operation. The top of the mounting plate 2 4-1 is fixedly connected with a pad block 4-2. The upper side of the pad block 4-2 is mounted with a ferry plate 4-3 through four screw nails 4-4. The middle part of the ferry plate 4-3 is mounted with a hexagonal nut 4-9. Cylinder 2 4-5, the setting of the spacer block 4-2 allows the ferry plate 4-3 to be installed on the spacer block 4-2 through the hexagonal nut 1 4-9, thereby ensuring the operating accuracy of cylinder 2 4-5 and the accurate pressing of the plunger. The output end of cylinder 2 4-5 is installed with a press joint 4-11 through the hexagonal nut 2 4-10. The press joint 4-11 and the plunger of the pilot valve are plug-fitted together. The hexagonal nut 2 4-10 allows the press joint 4-11 to be installed or removed from cylinder 2 4-5, so that when cylinder 2 4-5 is working, it can drive the press joint 4-11 to squeeze the plunger of the pilot valve, thereby simulating the working state of the pilot valve plunger and providing a guarantee for the operation of negative pressure cleaning of hydraulic oil.

[0065] Working principle: First, multiple air pipes and oil circuits are connected, and then the positioning component 3 is pushed upward by starting the cylinder 1 2-1, so that the pilot valve and the simulation component are in contact, and at the same time, it is ensured that the seal 3-2 on the passage plate 3-1 is completely fitted with the pilot valve oil port to achieve a sealed connection. At the same time, by starting the simulation component 4, the pressing joint 4-11 is driven to move upward or downward by the cylinder 2 4-5, thereby controlling the pressing operation of the pilot valve plunger, simulating the working state of the pilot valve plunger, and opening or closing the oil circuits one by one: when the plunger is pressed by the cylinder 2 4-5, the corresponding output oil port is connected to the P oil port; when the plunger is in the released state, the corresponding output oil port is connected to the T oil port;

[0066] By activating the oil suction mechanism, a vacuum pump is connected to the air tank through an air pipe to create a negative pressure environment. At the same time, the control circuit connects the oil ports on the passage plate 3-1 one by one, and the hydraulic oil is sucked out through negative pressure. Only one oil circuit is connected to the negative pressure environment at a time, and the other oil circuits remain closed. At this time, by connecting the eight oil circuits (1-T, 1-P, 2-T, 2-P, 3-T, 3-P, 4-T, 4-P) in sequence, the hydraulic oil in multiple oil circuits can be completely sucked out.

[0067] In addition, when the hydraulic oil is sucked into the air tank through the air pipe, most of the hydraulic oil enters the first-level air tank, and a small amount of hydraulic oil enters the second-level air tank. It is further filtered through the filter assembly and then stored. The air entering the pilot valve can be filtered through the air filter, thereby keeping the valve body clean.

[0068] Finally, after the oil suction is completed, stop the vacuum pump and release the cylinder 2-1 at the same time to reset the positioning component 3 and the pilot valve. At the same time, the cleaning work can be completed by removing the pilot valve from the clamping mechanism. If the hydraulic oil in the air tank has reached the discharge condition, the hydraulic oil can be released through the discharge port and recycled after filtration. Repeat the above steps to clean other pilot valves. The entire process is automatically controlled by the control circuit.

[0069] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A process for cleaning hydraulic oil remaining in a pilot valve body after testing, characterized in that: The following steps are involved: The pilot valve is positioned and clamped using a clamping mechanism to simulate the working state of the pilot valve. The clamping mechanism includes: A clamping body (1), a clamping assembly (2), a positioning assembly (3) and a simulation assembly (4), wherein: A clamping body (1) is used to support the clamping mechanism and provide space for supporting and installing subsequent components; A clamping assembly (2) is arranged on the outside of the clamping body (1) and is used to push the positioning assembly (3) to move up and down to achieve clamping and loosening of the pilot valve. The clamping assembly (2) includes a mounting plate (2-3) and a reinforcing plate (2-2). The mounting plate (2-3) and the reinforcing plate (2-2) are both mounted on the outside of the clamping body (1) by countersunk screws (2-5). A cylinder (2-1) is mounted on the bottom of the mounting plate (2-3) by countersunk screws (2-4). The output end of the cylinder (2-1) passes through the mounting plate (2-3). A positioning assembly (3) is arranged on the outside of the clamp body (1) and is used to position the pilot valve and seal the oil port of the pilot valve with the negative pressure environment. The positioning assembly (3) includes a guide rail (3-7), the guide rail (3-7) is fixedly connected to the outside of the clamp body (1) by countersunk screw three (3-6), a positioning plate (3-3) is installed on the other side of the guide rail (3-7) by screw nail two (3-5), a passage plate (3-1) is installed on the bottom of the positioning plate (3-3) by screw nail one (3-4), the middle of the passage plate (3-1) is provided with oil ports corresponding to multiple oil circuits, and each oil port is provided with a sealing member (3-2), the bottom of the passage plate (3-1) is installed with a connecting block (3-9) by screw nail three (3-8), and the bottom end of the connecting block (3-9) is fixedly installed on the output end of the cylinder one (2-1); The simulation component (4) is arranged on the outside of the clamp body (1), and presses and releases the plunger of the pilot valve in the form of extrusion to simulate the working state of the pilot valve. The simulation component (4) includes a second mounting plate (4-1) and a second reinforcing plate (4-7). The second mounting plate (4-1) and the second reinforcing plate (4-7) are both mounted on the outside of the clamp body (1) through a sixth screw (4-8). The second reinforcing plate (4-7) is mounted on the second mounting plate (4-1) through a fifth screw (4-6). -1), the top of the second mounting plate (4-1) is fixedly connected with a padding block (4-2), the upper side of the padding block (4-2) is mounted with a ferry plate (4-3) via a fourth screw (4-4), the middle of the ferry plate (4-3) is mounted with a second cylinder (4-5) via a first hexagonal nut (4-9), the output end of the second cylinder (4-5) is mounted with a press joint (4-11) via a second hexagonal nut (4-10), and the press joint (4-11) is plug-fitted with the plunger of the pilot valve; Multiple oil circuits of the pilot valve are connected one by one through the oil suction mechanism to form a negative pressure environment; Under the action of negative pressure, the hydraulic oil in the pilot valve is sucked into the air storage tank through the oil circuit; After the oil is sucked out, the clamp is released and the cleaning process is finished.

2. A process for cleaning hydraulic oil remaining in a pilot valve body after testing according to claim 1, characterized in that: The plurality of oil passages include a 1-T oil passage, a 1-P oil passage, a 2-T oil passage, a 2-P oil passage, a 3-T oil passage, a 3-P oil passage, a 4-T oil passage, and a 4-P oil passage.

3. A process for cleaning hydraulic oil remaining in a pilot valve body after testing according to claim 2, characterized in that: The oil suction mechanism comprises: Vacuum pump, air storage tank and multiple air pipes corresponding to the oil circuit, including: A vacuum pump connected to the gas storage tank to form a negative pressure; An air storage tank connected to the air pipe and used to store the hydraulic oil drawn from the pilot valve; The air pipe has two ends connected to the oil circuit of the pilot valve and the air storage tank, and is used to transport the hydraulic oil from the pilot valve to the air storage tank under the action of negative pressure.

4. A process for cleaning hydraulic oil remaining in a pilot valve body after testing according to claim 3, characterized in that: The air storage tank includes a first-level air storage tank and a second-level air storage tank. The first-level air storage tank is connected to the air pipe and is used to store most of the hydraulic oil sucked from the pilot valve. The second-level air storage tank is connected to the first-level air storage tank and the vacuum pump. At the same time, a filter assembly is provided between the second-level air storage tank and the first-level air storage tank for further filtering and storing a small amount of residual hydraulic oil.

5. The process for cleaning the hydraulic oil remaining in the valve body after the pilot valve test according to claim 1 is characterized in that: The negative pressure environment also includes an air filter, which is connected to the air pipe and is used to filter the air entering the pilot valve to ensure that the air entering the valve body is clean.

6. The process for cleaning the hydraulic oil remaining in the valve body after the pilot valve test according to claim 1 is characterized in that: The various parts of the negative pressure environment are connected by a quick-release interface, which facilitates cleaning and maintenance of the vacuum pump, gas tank and air pipe.

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