Technological method for cleaning residual hydraulic oil in valve body after pilot valve test

Abstract

The invention relates to the technical field of hydraulic equipment cleaning, and discloses a process method for cleaning residual hydraulic oil in a valve body after a pilot valve is tested, which comprises the following steps of: positioning and clamping the pilot valve by using a clamping mechanism, and simulating the working state of the pilot valve; a plurality of oil ways of the pilot valve are communicated one by one through the oil suction mechanism to form a negative pressure environment; under the action of negative pressure, hydraulic oil in the pilot valve is sucked into an air storage tank through an oil way; and after oil suction is completed, clamping is relieved, the cleaning process is finished, and the multiple oil ways comprise the 1-T oil way, the 1-P oil way, the 2-T oil way, the 2-P oil way, the 3-T oil way, the 3-P oil way, the 4-T oil way and the 4-P oil way. Through negative pressure oil suction, one-by-one switching of oil ways and automatic control, efficient cleaning of hydraulic oil in the pilot valve is achieved, the cleaning efficiency is improved, the environmental influence is reduced, and the operation process is optimized.

Description

Technical Field

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

[0002] Hydraulic equipment is widely used in fields such as construction machinery, industrial equipment, and aerospace. As a key component in the hydraulic system, the performance of the pilot valve directly affects the working efficiency and reliability of the system. During the production process, the pilot valve needs to undergo strict hydraulic tests to verify its function and sealing performance. However, after the hydraulic test, hydraulic oil often remains inside the pilot valve. If this hydraulic oil is not thoroughly cleaned, it will flow out during the product transfer and use, polluting the environment and even affecting the operation quality at the assembly site of the host factory.

[0003] Currently, the common method for cleaning the residual hydraulic oil after the pilot valve test is high-pressure air blowing. This method uses high-pressure air flow to impact the internal oil circuit and relies on the speed and pressure of the air flow to discharge the hydraulic oil from the oil circuit. This method has certain advantages. For example, the equipment is simple, easy to use, does not require complex cleaning devices, and can quickly clean the surface hydraulic oil in the oil circuit. In mass production, this method can meet the basic cleaning requirements and is thus widely used.

[0004] However, the existing high-pressure air blowing method still has many problems. First of all, this method is not friendly to the oil circuit with complex structure. For the oil circuit blocked by a plunger or a spool, high-pressure air often cannot enter the deep area, resulting in incomplete cleaning of the residual hydraulic oil. Secondly, the operation process needs to be repeated, the cleaning efficiency is not high, and the labor intensity is large. Moreover, the high-pressure air flow will atomize the hydraulic oil, forming a large amount of oil mist, polluting the air and the ground, and even posing a potential threat to the health of the operators. In addition, the collision between the air flow and the oil circuit outlet generates extremely loud noise, which not only affects the working environment but also poses a threat to hearing health. Summary of the Invention

[0005] In view of the deficiencies of the prior art, the present invention provides a process method for cleaning the hydraulic oil remaining in the valve body after the pilot valve test, which solves the problems of incomplete cleaning, low efficiency, oil mist pollution of the environment, and high noise existing in the prior art when using high-pressure air blowing to clean the residual hydraulic oil of the pilot valve.

[0006] To achieve the above objectives, the present invention is realized through the following technical solutions: A process method for cleaning the hydraulic oil remaining in the valve body after the pilot valve test, comprising the following steps: Use a clamping mechanism to position and clamp the pilot valve, simulating the working state of the pilot valve; Connect each of the multiple oil circuits of the pilot valve through an 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 gas storage tank through the oil circuit; After the oil suction is completed, the clamping is released and the cleaning process ends.

[0007] Preferably, the plurality of 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.

[0008] Preferably, the oil suction mechanism includes: A vacuum pump, a gas storage tank and a plurality of air pipes corresponding to the oil circuit, wherein: A vacuum pump, which is connected to the gas storage tank and is used to form negative pressure; A gas storage tank, which is connected to the air pipe and is used to store the hydraulic oil sucked from the pilot valve; An air pipe, the two ends of which are respectively connected to the oil circuit of the pilot valve and the gas storage tank, and are used to transport the hydraulic oil from the pilot valve to the gas storage tank under the action of negative pressure.

[0009] Preferably, the gas storage tank includes a primary gas storage tank and a secondary gas storage tank. The primary gas storage tank is connected to the air pipe and is used to store most of the hydraulic oil sucked from the pilot valve. The secondary gas storage tank is connected to the primary gas storage tank and the vacuum pump. At the same time, a filtering component is arranged between the secondary gas storage tank and the primary gas storage tank, which is used to further filter and store a small amount of residual hydraulic oil.

[0010] Preferably, an air filter is further included in the negative pressure environment. The air filter is connected to the air pipe and is used to filter the air entering the pilot valve to ensure the cleanliness of the air entering the valve body.

[0011] Preferably, each part of the negative pressure environment is connected through a quick-disassembly interface, and the quick-disassembly interface facilitates the cleaning and maintenance of the vacuum pump, the gas storage tank and the air pipe.

[0012] Preferably, the clamping mechanism includes: A fixture body, a clamping component, a positioning component and a simulation component, wherein: The fixture body is used to support the clamping mechanism and at the same time provide a space for supporting and installing subsequent components; The clamping component is arranged on the outside of the fixture body and is used to push the positioning component to move up and down to realize the clamping and loosening of the pilot valve; The positioning component is arranged on the outside of the fixture body and is used to position the pilot valve and seal the connection between the oil port of the pilot valve and the negative pressure environment; The simulation component is arranged on the outside of the fixture body and presses and releases the plunger of the pilot valve in a squeezing form to simulate the working state of the pilot valve.

[0013] Preferably, the clamping assembly includes a first mounting plate and a first reinforcing plate. Both the first mounting plate and the first reinforcing plate are mounted on the outside of the jig body by countersunk head screws II. A first cylinder is mounted at the bottom of the first mounting plate by countersunk head screws, and the output end of the first cylinder penetrates through the first mounting plate.

[0014] Preferably, the positioning assembly includes a guide rail. The guide rail is fixedly connected to the outside of the jig body by countersunk head screws III. A positioning plate is mounted on the other side of the guide rail by threaded screws II. A passage plate is mounted at the bottom of the positioning plate by threaded screws I. Oil ports corresponding to a plurality of oil circuits are formed in the middle of the passage plate, and a sealing member is provided in each oil port. A connecting block is mounted at the bottom of the passage plate by threaded screws III, and the bottom end of the connecting block is fixedly mounted on the output end of the first cylinder.

[0015] Preferably, the simulation assembly includes a second mounting plate and a second reinforcing plate. Both the second mounting plate and the second reinforcing plate are mounted on the outside of the jig body by threaded screws VI. The second reinforcing plate is mounted on the upper side of the second mounting plate by threaded screws V. A heightening block is fixedly connected to the top of the second mounting plate. A transition plate is mounted on the upper side of the heightening block by threaded screws IV. A second cylinder is mounted in the middle of the transition plate by hexagon nuts I. The output end of the second cylinder is mounted with a pressing joint by hexagon nuts II, and the pressing joint is inserted and matched with the plunger of the pilot valve.

[0016] The present invention provides a process method for cleaning the hydraulic oil remaining in the valve body after the pilot valve test. It has the following beneficial effects: 1. The present invention uses the simulation assembly to simulate the actual working state of the pilot valve plunger, and realizes the sequential switching of the oil circuits by precisely controlling the pressing and releasing of the plunger. This method not only thoroughly cleans the hydraulic oil in all oil circuits, but also avoids the problem of oil circuit residue. Compared with the traditional high-pressure purging technology, the present invention solves the old problem of incomplete cleaning caused by the inability to fully open the oil circuit.

[0017] 2. The present invention combines the negative pressure technology and the sealing assembly, connects the vacuum pump to the passage plate, and cleans the oil circuits one by one in a negative pressure environment. The oil circuit is tightly sealed, ensuring no leakage during the oil suction process and extremely high efficiency. The problems of loose oil circuit connection and poor sealing commonly found in traditional processes no longer occur here, and both the oil suction efficiency and the cleaning effect are significantly improved.

[0018] 3. Through circuit control, the entire oil suction process is automated without manual intervention. Coupled with the hierarchical storage and filtration design, the hydraulic oil is recycled, the operation is simple and more environmentally friendly. The previous technologies were highly dependent on manual labor and were prone to generating oil mist pollution to the environment. The present invention completely avoids these troubles, and the cleaning process is efficient and healthy-friendly. Description of the Drawings

[0019] Figure 1 It is a schematic diagram of the principle of the process method of the present invention; Figure 2 It is a schematic diagram of the structure of the clamping mechanism of the present invention; Figure 3 It is a schematic diagram of the structure of cylinder 1 of the present invention; Figure 4 It is a schematic diagram of the structure of the positioning component of the present invention; Figure 5 It is a schematic diagram of the structure of the connecting block of the present invention; Figure 6 It is a schematic diagram of the structure of the simulation component of the present invention; Figure 7 It is a schematic diagram of the structure of the pressing joint of the present invention.

[0020] Among them, 1. fixture body; 2. clamping component; 2-1. cylinder 1; 2-2. reinforcing plate 1; 2-3. mounting plate 1; 2-4. countersunk head screw 1; 2-5. countersunk head screw 2; 3. positioning component; 3-1. passage plate; 3-2. seal; 3-3. positioning plate; 3-4. threaded screw 1; 3-5. threaded screw 2; 3-6. countersunk head screw 3; 3-7. guide rail; 3-8. threaded screw 3; 3-9. connecting block; 4. simulation component; 4-1. mounting plate 2; 4-2. spacer block; 4-3. transition plate; 4-4. threaded screw 4; 4-5. cylinder 2; 4-6. threaded screw 5; 4-7. reinforcing plate 2; 4-8. threaded screw 6; 4-9. hexagon nut 1; 4-10. hexagon nut 2; 4-11. pressing joint. Specific embodiments

[0021] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the specification of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0022] Please refer to the attached Figure 1 - attached Figure 7 , the embodiments of the present invention provide a process method for cleaning the hydraulic oil remaining in the valve body after the pilot valve test, including the following steps: Use the clamping mechanism to position and clamp the pilot valve, simulate the working state of the pilot valve, perform positioning, clamping and oil circuit switching on the pilot valve through the clamping mechanism, ensure the tightness and reliability of the negative pressure oil suction process, and avoid air leakage or oil circuit misalignment; 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 simultaneous opening of multiple oil circuits. Under the action of negative pressure, the hydraulic oil in the pilot valve is sucked into the gas storage tank through the oil circuit. Through the hierarchical storage and filtration of the gas storage tank, it is ensured that the hydraulic oil is completely extracted and effectively filtered. At the same time, the air in the oil circuit is kept clean, avoiding polluting the valve body or the environment. After the oil suction is completed, the clamping is released and the cleaning process ends.

[0023] Please refer to the appendix 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. Through the setting of multiple oil circuits, it is used to clarify the classification and function of the oil circuits, ensure the accurate switching of each oil circuit according to the working state, and provide a technical basis for negative pressure oil suction.

[0024] Please refer to the appendix Figure 1 In a preferred embodiment of the present invention, the oil suction mechanism includes: A vacuum pump, a gas storage tank and multiple air pipes corresponding to the oil circuits. Among them, through the setting of multiple air pipes, it is used to ensure that each air pipe matches the corresponding oil circuit, so as to ensure that the hydraulic oil can be smoothly sucked into the gas storage tank under the action of negative pressure: The vacuum pump is connected to the gas storage tank and is used to form negative pressure. Through the formation of negative pressure by the vacuum pump, the efficient suction of hydraulic oil is ensured, avoiding the problem of incomplete cleaning caused by insufficient negative pressure; The gas storage tank is connected to the air pipe and is used to store the hydraulic oil sucked from the pilot valve. Through the partition design and filtration function of the gas storage tank, the effective storage and purification of the hydraulic oil are ensured, reducing equipment loss and realizing resource recycling; The air pipe has two ends respectively connected to the oil circuit of the pilot valve and the gas storage tank, and is used to transport the hydraulic oil from the pilot valve to the gas storage tank under the action of negative pressure. Through this layout, it can ensure that the hydraulic oil can be smoothly transmitted, avoiding leakage or a decrease in oil suction efficiency.

[0025] Please refer to the appendix Figure 1, in a preferred embodiment of the present invention, the gas storage tank includes a primary gas storage tank and a secondary gas storage tank. The primary gas storage tank is connected to the air pipe and is used to store most of the hydraulic oil sucked from the pilot valve. The secondary gas storage tank is connected to the primary gas storage tank and the vacuum pump. At the same time, a filtering component is arranged between the secondary gas storage tank and the primary gas storage tank, which is used to further filter and store a small amount of residual hydraulic oil. Through the functional partition of the primary gas storage tank and the secondary gas storage tank, the storage efficiency and cleanliness of the hydraulic oil are improved, impurity pollution of the system is avoided, and at the same time, it can prevent the hydraulic oil from directly entering the vacuum pump and causing equipment loss.

[0026] Please refer to the attached Figure 1 , in a preferred embodiment of the present invention, an air filter is further included in the negative pressure environment. The air filter is connected to the air pipe and is used to filter the air entering the pilot valve to ensure the cleanliness of the air entering the valve body. Through the structural design of the air filter, the cleanliness of the air entering the pilot valve is ensured, and pollution of the internal oil circuit of the valve body or the gas storage tank is avoided. The air filter guarantees the cleanliness inside the valve body, prevents the influence of external pollution on the cleaning effect, and extends the service life of the equipment. At the same time, it is connected by tightening bolts with a connecting disc, and can be conveniently taken out and replaced from the housing. And the air filter is a prior art and will not be elaborated too much in this text.

[0027] Please refer to the attached Figure 1 , in a preferred embodiment of the present invention, each part of the negative pressure environment is connected through a quick-disassembly interface. The quick-disassembly interface is convenient for cleaning and maintaining the vacuum pump, the gas storage tank and the air pipe. The quick-disassembly interface is used to connect the vacuum pump, the gas storage tank and the air pipe in the negative pressure environment. Each interface is equipped with a sealing gasket to ensure the sealing performance of the connection under high negative pressure conditions. Through the convenient connection and separation functions of the quick-disassembly interface, the operation efficiency of the equipment is improved, and the maintenance and repair time is shortened.

[0028] Please refer to the attached Figure 1 - Attached Figure 7 , in a preferred embodiment of the present invention, the clamping mechanism includes: A clamping body 1, a clamping component 2, a positioning component 3 and a simulation component 4, where: The clamping body 1 is used to support the clamping mechanism and at the same time provide a space for supporting and installing subsequent components. The clamping body 1 provides a stable and reliable support foundation, ensuring the operation stability and installation convenience of the entire clamping mechanism; The clamping component 2 is arranged on the outside of the clamping body 1 and is used to push the positioning component 3 to move up and down to realize the clamping and loosening of the pilot valve. The clamping component 2 realizes the stable clamping and loosening of the pilot valve through the up and down movement function, ensuring the consistency of equipment operation; The positioning component 3 is arranged on the outer side of the fixture body 1 and is used to position the pilot valve and make a sealed connection between the oil ports of the pilot valve and the negative pressure environment. The design of the positioning component 3 ensures that the pilot valve can complete rapid connection with the oil circuit and the air pipe after being clamped, providing a basic guarantee for the subsequent oil suction operation. Through precise positioning and sealing design, the connection tightness and cleaning efficiency between the pilot valve and the negative pressure system are ensured. The simulation component 4 is arranged on the outer side of the fixture body 1 and presses and releases the plunger of the pilot valve in a squeezing manner to simulate the working state of the pilot valve. By simulating the plunger action, the simulation component ensures that the oil circuit can be accurately switched, providing necessary conditions for the negative pressure oil suction operation.

[0029] Please refer to the appendix Figure 2 and the appendix Figure 3 In a preferred embodiment of the present invention, the clamping component 2 includes a first mounting plate 2-3 and a first reinforcing plate 2-2. Both the first mounting plate 2-3 and the first reinforcing plate 2-2 are mounted on the outer side of the fixture body 1 by countersunk head screws two 2-5. A first cylinder 2-1 is mounted at the bottom of the first mounting plate 2-3 by countersunk head screws 2-4. The output end of the first cylinder 2-1 penetrates through the first mounting plate 2-3. The stability of the first mounting plate 2-3 is improved by the first reinforcing plate 2-2, thus ensuring the firmness of the clamping component 2 on the outer side of the fixture body 1. At the same time, it can effectively avoid deformation or loosening caused by the vibration generated by the repeated operation of the cylinder 2-1, thereby ensuring the long-term stability of the component. The first cylinder 2-1 realizes the up-and-down drive of the positioning component 3 through telescopic movement, thereby completing the clamping or loosening operation of the pilot valve for the installation and disassembly of the pilot valve.

[0030] Please refer to the appendix Figure 2 、the appendix Figure 4 and the appendix Figure 5, in a preferred embodiment of the present invention, the positioning assembly 3 includes a guide rail 3-7. The guide rail 3-7 is fixedly connected to the outside of the fixture 1 by countersunk screws III 3-6. Installing the guide rail 3-7 by countersunk screws III 3-6 can improve the stability of the guide rail 3-7, thereby avoiding problems such as deviation, inclination, and detachment of the guide rail 3-7 during the use of the positioning assembly 3, and thus improving the stability of the positioning assembly 3. On the other side of the guide rail 3-7, a positioning plate 3-3 is installed by screw II 3-5. At the bottom of the positioning plate 3-3, a passage plate 3-1 is installed by screw I 3-4. Installing the positioning plate 3-3 on the guide rail 3-7 by screw II 3-5 enables it to slide freely along the direction of the guide rail 3-7, ensuring the accurate docking position of the passage plate 3-1 with the oil circuit of the pilot valve and avoiding operation errors. In the middle of the passage plate 3-1, oil ports corresponding to multiple oil circuits are provided, and a seal 3-2 is arranged in each oil port. The multi-oil port design of the passage plate 3-1 and the sealing performance provided by the seal 3-2 ensure the connection reliability of the oil circuit and the stability of the negative pressure oil suction operation. At the bottom of the passage plate 3-1, a connecting block 3-9 is installed by screw III 3-8. The bottom end of the connecting block 3-9 is fixedly installed at the output end of the first cylinder 2-1. Under the action of screw III 3-8 and the connecting block 3-9, the first cylinder 2-1 and the positioning assembly 3 can be quickly connected, so that it can drive the positioning assembly 3 to move during operation, thereby completing the alignment and assembly of the device.

[0031] Please refer to the attached Figure 2 , the attached Figure 6 and the attached Figure 7 , in a preferred embodiment of the present invention, the simulation assembly 4 includes a second mounting plate 4-1 and a second reinforcing plate 4-7. Both the second mounting plate 4-1 and the second reinforcing plate 4-7 are installed on the outside of the fixture 1 by screw VI 4-8. The second reinforcing plate 4-7 is installed on the upper side of the second mounting plate 4-1 by screw V 4-6. The combined design of the second mounting plate 4-1 and the second reinforcing plate 4-7 enhances the rigidity of the overall structure, ensuring the stability and durability during the operation of the simulation assembly 4. At the top of the second mounting plate 4-1, a heightening block 4-2 is fixedly connected. On the upper side of the heightening block 4-2, a transition plate 4-3 is installed by screw IV 4-4. In the middle of the transition plate 4-3, a second cylinder 4-5 is installed by hexagon nut I 4-9. The setting of the heightening block 4-2 allows the transition plate 4-3 to be installed on the heightening block 4-2 by hexagon nut I 4-9, thereby ensuring the operation accuracy of the second cylinder 4-5 and the accurate pressing of the plunger. The output end of the second cylinder 4-5 is installed with a pressing joint 4-11 by hexagon nut II 4-10. The pressing joint 4-11 is inserted and matched with the plunger of the pilot valve. Allowing the pressing joint 4-11 to be installed or disassembled from the second cylinder 4-5 by hexagon nut II 4-10 enables the second cylinder 4-5 to drive the pressing joint 4-11 to extrude the plunger of the pilot valve during operation, thereby simulating the working state of the plunger of the pilot valve and providing a guarantee for the operation of negative pressure cleaning of hydraulic oil.

[0032] Working principle: First, connect multiple air pipes and oil circuits, and then push the positioning component 3 upward by starting the cylinder 1 (2-1), so that the pilot valve contacts the simulation component. At the same time, ensure that the seal 3-2 on the passage plate 3-1 fits perfectly with the oil port of the pilot valve to achieve a sealed connection. At the same time, by starting the simulation component 4, drive the pressing joint 4-11 to move up or down through the cylinder 2 (4-5), so as to control the pressing operation on the plunger of the pilot valve, simulate the working state of the pilot valve plunger, and open or close the oil circuits one by one: when the plunger is pressed by the cylinder 2 (4-5), the corresponding output oil port communicates with the P oil port; when the plunger is in the released state, the corresponding output oil port communicates with the T oil port; Among them, by starting the oil suction mechanism, a negative pressure environment is formed by connecting the vacuum pump to the gas storage tank through the air pipe. At the same time, the control circuit sequentially connects the oil ports on the passage plate 3-1, and sucks the hydraulic oil through negative pressure. Only one oil circuit is connected to the negative pressure environment each time, and the remaining oil circuits remain closed. At this time, by sequentially connecting 8 oil circuits (1-T, 1-P, 2-T, 2-P, 3-T, 3-P, 4-T, 4-P), the hydraulic oil in multiple oil circuits can be completely sucked out; In addition, while the hydraulic oil is sucked into the gas storage tank through the air pipe, most of the hydraulic oil enters the primary gas storage tank, and a small amount of hydraulic oil enters the secondary gas storage tank. After being further filtered by the filter component, it is stored, and the air entering the pilot valve can be filtered by the air filter, so as to keep the inside of the valve body clean.

[0033] Finally, after the oil suction is completed, stop the vacuum pump, and at the same time release the cylinder 2-1 to reset the positioning component 3 and the pilot valve. At the same time, by taking out the pilot valve from the clamping mechanism, the cleaning work can be completed. If the hydraulic oil in the gas storage tank has reached the discharge condition, the hydraulic oil can be discharged through the discharge port, recycled after filtration, and the above steps are repeated to clean other pilot valves. The whole process is automatically controlled by the control circuit.

[0034] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A process for cleaning hydraulic oil remaining in a valve body after a pilot valve test, characterized in that: The following steps are involved: Use the clamping mechanism to position and clamp the pilot valve to simulate the working state 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 valve body after a pilot valve test according to claim 1, characterized in that: The multiple 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.

3. A process for cleaning hydraulic oil remaining in a valve body after a pilot valve test according to claim 2, characterized in that: The oil suction mechanism comprises: Vacuum pump, gas storage tank and multiple gas pipes corresponding to the oil circuit, including: A vacuum pump, the vacuum pump is connected to the gas storage tank and is used to form a negative pressure; An air storage tank, the air storage tank is connected to the air pipe and is used to store the hydraulic oil sucked from the pilot valve; An air pipe, both ends of which are respectively 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 valve body after a pilot valve test according to claim 3, characterized in that: The air storage tank includes a primary air storage tank and a secondary air storage tank. The primary air storage tank is connected to the air pipe and is used to store most of the hydraulic oil absorbed from the pilot valve. The secondary air storage tank is connected to the primary air storage tank and the vacuum pump. At the same time, a filter assembly is arranged between the secondary air storage tank and the primary air storage tank for further filtering and storing a small amount of residual hydraulic oil.

5. A process for cleaning hydraulic oil remaining in a valve body after a pilot valve test according to claim 1, 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. A process for cleaning hydraulic oil remaining in a valve body after a pilot valve test according to claim 1, characterized in that: 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 storage tank and air pipe.

7. A process for cleaning hydraulic oil remaining in a valve body after a pilot valve test according to claim 1, characterized in that: The clamping mechanism comprises: A clamp body (1), a clamping component (2), a positioning component (3) and a simulation component (4), wherein: A clamp body (1) is used to support the clamping mechanism and provide space for supporting and installing subsequent components; A clamping assembly (2), which 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 clamping and loosening of the pilot valve; A positioning assembly (3), which is arranged on the outside of the clamp body (1) and is used to position the pilot valve and to seal the oil port of the pilot valve with the negative pressure environment; The simulation component (4) is arranged on the outside of the clamp body (1) and performs pressing and releasing operations on the plunger of the pilot valve in the form of squeezing to simulate the working state of the pilot valve.

8. A process for cleaning hydraulic oil remaining in a valve body after a pilot valve test according to claim 7, characterized in that: The clamping assembly (2) comprises a mounting plate 1 (2-3) and a reinforcing plate 1 (2-2), wherein the mounting plate 1 (2-3) and the reinforcing plate 1 (2-2) are both mounted on the outer side of the clamp body (1) via countersunk screws 2 (2-5), and a cylinder 1 (2-1) is mounted on the bottom of the mounting plate 1 (2-3) via countersunk screws (2-4), and the output end of the cylinder 1 (2-1) passes through the mounting plate 1 (2-3).

9. A process for cleaning hydraulic oil remaining in a valve body after a pilot valve test according to claim 8, characterized in that: The positioning assembly (3) comprises a guide rail (3-7), the guide rail (3-7) being fixedly connected to the outer side of the clamp body (1) by countersunk screw three (3-6), a positioning plate (3-3) being installed on the other side of the guide rail (3-7) by screw nail two (3-5), a passage plate (3-1) being installed on the bottom of the positioning plate (3-3) by screw nail one (3-4), oil ports corresponding to a plurality of oil paths being opened in the middle of the passage plate (3-1), and a sealing member (3-2) being provided in each oil port, a connecting block (3-9) being installed on the bottom of the passage plate (3-1) by screw nail three (3-8), and the bottom end of the connecting block (3-9) being fixedly installed on the output end of the cylinder one (2-1).

10. A process for cleaning hydraulic oil remaining in a valve body after a pilot valve test according to claim 7, characterized in that: The simulation component (4) comprises a second mounting plate (4-1) and a second reinforcing plate (4-7), wherein the second mounting plate (4-1) and the second reinforcing plate (4-7) are both mounted on the outer side of the clamp body (1) via a sixth threaded nail (4-8), and the second reinforcing plate (4-7) is mounted on the upper side of the second mounting plate (4-1) via a fifth threaded nail (4-6). A padding block (4-2) is fixedly connected to the top of the second mounting plate (4-1), and a ferry plate (4-3) is mounted on the upper side of the padding block (4-2) via a fourth threaded nail (4-4). A second cylinder (4-5) is mounted on the middle part of the ferry plate (4-3) via a first hexagonal nut (4-9), and a press joint (4-11) is mounted on the output end of the second cylinder (4-5) via a second hexagonal nut (4-10), and the press joint (4-11) is plug-fitted with the plunger of the pilot valve.

Images