Hydraulic control valve assembly for hydraulic system

Abstract

The invention discloses a hydraulic control valve assembly for a hydraulic system, and relates to the technical field of hydraulic systems, the hydraulic control valve assembly comprises a control valve shell, the outer side of the control valve shell is oppositely provided with a valve body butt joint pipe, and the outer side of the control valve shell is provided with a sealing base plate for improving the sealing performance of a valve body. According to the hydraulic control valve assembly for the hydraulic system, the magnetic plate can move in the direction away from the center of the sealing base plate under the attraction force of the valve body to the connecting pipe, then the air supply plate is driven by the connecting rod to slide in the air supply cavity, air in the air supply cavity can be drawn through sliding of the air supply plate, and the air supply cavity sucks the air in the communicating cavity through the ventilation channel; and the negative pressure in the communicating cavity can further enhance the adsorption force of the positioning suction cup to the control valve shell, so that the sealing base plate is more tightly attached to the outer side of the control valve shell, the overall sealing performance and stability of installation of the sealing base plate are remarkably improved, and hydraulic oil is effectively prevented from leaking from the connecting position.

Description

Technical Field

[0001] This invention relates to the field of hydraulic system technology, specifically to a hydraulic control valve assembly for a hydraulic system. Background Technology

[0002] The hydraulic control valve assembly in a hydraulic system is the core control component. By adjusting the flow direction, pressure, and flow rate of the hydraulic fluid, it ensures that the actuators (such as hydraulic cylinders and hydraulic motors) move according to predetermined requirements, thereby achieving stable operation of the system. The hydraulic control valve assembly is mainly divided into three types: pressure control valve, flow control valve, and directional control valve.

[0003] Existing technology 1 (Chinese patent with announcement number CN112503045B and announcement date of 2023-03-21) discloses a hydraulic valve assembly, which includes a main valve body, a first alternating valve core, a first one-way valve core, and a second one-way valve core. The main valve body has a hydraulic flow channel, a mounting through hole, a first mounting blind hole, a second mounting blind hole, a first outlet, and a second outlet. The mounting through hole, the first mounting blind hole, and the second mounting blind hole are all connected to the hydraulic flow channel. The first outlet is connected to the first mounting blind hole, and the second outlet is connected to the second mounting blind hole. The first alternating valve core is inserted into the mounting through hole, and the first one-way valve core and the second one-way valve core are respectively inserted into the first mounting blind hole and the second mounting blind hole. This avoids the problem of large flow resistance loss caused by many bends and long paths in the hydraulic flow channel, and also avoids the problem of inconvenient disassembly of the first alternating valve core, the first one-way valve core, and the second one-way valve core.

[0004] There is also a prior art (Chinese patent CN121296527A, published on 2026-01-09) of a hydraulic valve assembly, which aims to solve or alleviate the pressure difference problem between the inlet and outlet chambers of hydraulic valves in some working conditions in the prior art. It includes a main valve body, a main valve core assembly, a control cylinder, a control piston, and a guide assembly. The main valve body includes a main oil port and a main valve core port; the main valve core assembly is inserted into the main valve core port and forms a valve-line sealing structure with the main valve core port; the control cylinder is located above the main valve body; the control piston is installed in the main valve core assembly and extends into the control cylinder together with it; the guide assembly is located above the control cylinder and is used to control the movement direction of the main valve core assembly to form different working states; the various components cooperate with each other to utilize external high-pressure oil to push the control piston to open the main valve core assembly.

[0005] While existing technologies have optimized the structure and performance of hydraulic valves to some extent, traditional hydraulic valves rely on the elastic deformation of the gasket itself and the pre-tightening force of fasteners such as bolts to achieve sealing. Under conditions of long-term vibration, temperature changes, or hydraulic shock, this method is prone to problems such as uneven stress on the gasket, increased local wear, or loosening of the pre-tightening force, which can lead to oil leakage, affect the normal operation of the hydraulic system, and even cause safety hazards.

[0006] Therefore, we propose a hydraulic control valve assembly for hydraulic systems to address the problems mentioned above. Summary of the Invention

[0007] The purpose of this invention is to provide a hydraulic control valve assembly for a hydraulic system, in order to solve the problems mentioned in the background art. The traditional sealing methods currently on the market mostly rely on the elastic deformation of the gasket itself and the pre-tightening force of fasteners such as bolts to achieve sealing. Under long-term vibration, temperature changes or hydraulic shock conditions, this method is prone to problems such as uneven stress on the gasket, increased local wear or loosening of the pre-tightening force, which in turn leads to oil leakage, affects the normal operation of the hydraulic system, and may even cause safety hazards.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a hydraulic control valve assembly for a hydraulic system, comprising a control valve housing, an outer ear of which is provided for a valve body connecting pipe, an outer ear of which is provided for a sealing gasket to improve the sealing performance of the valve body, an auxiliary connecting rod fixedly connected to the control valve housing, a stabilizing mechanism provided on the sealing gasket, the stabilizing mechanism being positioned corresponding to the auxiliary connecting rod, and the stabilizing mechanism initially improving the stability of the sealing gasket installation through the connecting and installation action of the valve body connecting pipe, and a sealing mechanism provided inside the sealing gasket, the sealing mechanism further improving the stability of the sealing gasket installation through the connecting and installation action of the valve body connecting pipe.

[0009] Preferably, the stabilizing mechanism includes a docking groove, which is formed on the side of the sealing gasket near the outer shell of the control valve housing. During the initial assembly of the sealing gasket, the auxiliary docking rod is docked and set inside the docking groove.

[0010] Preferably, two sets of limiting blocks are fixedly connected to the outer side of the auxiliary docking rod, and the limiting blocks are arranged in a fan-shaped structure. A stabilizing groove is fixedly connected inside the sealing gasket, and the stabilizing groove is opened in an arc shape. The stabilizing groove is connected to the docking groove, and the limiting block can slide along the arc-shaped trajectory in the stabilizing groove.

[0011] Preferably, the sealing gasket has a groove for the valve body connecting pipe to be connected, and a second spring is fixedly connected to the sealing gasket. The other end of the second spring is fixedly connected to a positioning plate. When the valve body connecting pipe is connected to the control valve housing, the outer side of the valve body connecting pipe and the positioning plate are in contact with each other, and two sets of the second spring are symmetrically arranged about the center point of the positioning plate.

[0012] Preferably, an air supply bladder is fixedly connected between the positioning plate and the sealing gasket, and a connecting pipe is connected through one side of the air supply bladder. An expansion bladder is fixedly connected inside the stabilizing groove, and the expansion bladder is connected through the other end of the connecting pipe. The expansion bladder is arranged in an arc shape. In the uninflated state, the side of the expansion bladder does not contact the side of the limiting block. In the inflated state, the expansion bladder abuts against the limiting block and drives the limiting block to rotate along the stabilizing groove. After rotation, the limiting block cannot disengage from the docking groove. The positioning plate squeezes the expansion bladder through the abutment action of the valve body connecting pipe.

[0013] Preferably, the sealing mechanism includes a communicating cavity, which is opened inside the sealing gasket. A positioning suction cup is fixedly connected to the side of the sealing gasket near the outer shell of the control valve housing, and the inner end of the positioning suction cup is inserted through the communicating cavity. The positioning suction cup has a hole that communicates with the communicating cavity. After the sealing gasket is initially assembled, the positioning suction cup is adsorbed on the outside of the control valve housing.

[0014] Preferably, the sealing gasket has an air supply chamber inside, and an air supply plate is slidably connected inside the air supply chamber, with the side of the air supply plate fitting against the inner wall of the air supply chamber, and a connecting rod is fixedly connected to the air supply plate.

[0015] Preferably, a magnetic plate is fixedly connected to the other end of the connecting rod. When the valve body connecting pipe is connected to the control valve housing, the outer side of the valve body connecting pipe and the magnetic plate attract each other. A first spring is fixedly connected between the magnetic plate and the sealing gasket.

[0016] Preferably, a ventilation channel is provided between the connecting cavity and the air supply cavity, and the two sets of connecting rods are kept away from each other when the valve body connecting pipe is docked.

[0017] Compared with the prior art, the beneficial effects of the present invention are: A sealing gasket is provided to improve the sealing performance at the connection between the control valve housing and the valve body connecting pipe, preventing hydraulic oil leakage during transmission. During the initial assembly of the sealing gasket, the auxiliary connecting rod on the control valve housing is inserted into the connecting groove opened on the sealing gasket to initially define the position of the sealing gasket.

[0018] When the valve body connecting pipe is connected, the valve body connecting pipe can abut against the positioning plate. Under the elastic force of the second spring, the positioning plate is tightly fitted with the valve body connecting pipe. Multiple sets of positioning plates can limit the valve body connecting pipe, ensuring the stability of the valve body connecting pipe connection.

[0019] As the valve body connecting pipe continues to be installed, the positioning plate is squeezed, which compresses the gas in the air supply bladder and causes the expansion bladder to expand. The expanded bladder exerts a thrust on the limiting block, causing it to rotate. When the limiting block rotates to a certain angle, its fan-shaped side will engage with the inner wall of the stabilizing groove, thereby effectively preventing the auxiliary connecting rod from disengaging from the connecting groove. This further improves the stability of the sealing gasket installed on the control valve body and prevents the sealing gasket from shifting due to vibration and other factors during the operation of the hydraulic system.

[0020] A positioning suction cup is provided on the side of the sealing gasket near the control valve housing. During the initial assembly, the sealing gasket can be initially adsorbed and fixed between the sealing gasket and the control valve housing by the positioning suction cup, which enhances the initial stability of the connection between the two.

[0021] During the docking process of the valve body connecting pipe, the magnetic plate is attracted by the valve body connecting pipe and moves away from the center of the sealing gasket. This, in turn, drives the air supply plate to slide in the air supply chamber via the connecting rod. The sliding of the air supply plate draws gas from the air supply chamber. The air supply chamber draws gas from the connecting chamber through the ventilation channel, creating a negative pressure state inside the connecting chamber. Since the inner end of the positioning suction cup is connected to the connecting chamber, the negative pressure in the connecting chamber further enhances the adsorption force of the positioning suction cup on the control valve housing, making the sealing gasket fit more tightly against the outside of the control valve housing. This significantly improves the overall sealing and stability of the sealing gasket installation and effectively prevents hydraulic oil from leaking from the connection. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a three-dimensional structural diagram of the assembled state of the present invention; Figure 3 This is a three-dimensional structural diagram of the valve body connecting pipe of the present invention; Figure 4 This is a schematic diagram of the sealing gasket structure of the present invention; Figure 5 This is a three-dimensional rear view schematic diagram of the sealing gasket structure of the present invention; Figure 6 This is a schematic diagram of the three-dimensional structure of the air supply chamber of the present invention; Figure 7 This is a schematic diagram of the three-dimensional structure of the inflatable airbag of the present invention; Figure 8 This is a schematic diagram of the three-dimensional structure of the communicating cavity of the present invention; Figure 9 This is a schematic diagram of the three-dimensional structure of the stabilizing groove of the present invention. In the diagram: 1. Control valve housing; 2. Sealing gasket; 3. Valve body connecting pipe; 4. Auxiliary connecting rod; 5. Connecting groove; 6. Stabilizing groove; 7. Positioning suction cup; 8. Magnetic plate; 9. Positioning plate; 10. First spring; 11. Second spring; 12. Air supply chamber; 13. Ventilation passage; 14. Limiting block; 15. Air supply bladder; 16. Connecting pipe; 17. Inflatable bladder; 18. Air supply plate; 19. Connecting rod; 20. Connecting cavity. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] Example 1: As Figures 1-5 The present invention provides the following technical solution: a hydraulic control valve assembly for a hydraulic system, wherein a valve body connecting pipe 3 is provided on the outer side of the control valve housing 1, and a sealing gasket 2 for improving the sealing performance of the valve body is provided on the outer side of the control valve housing 1. The sealing gasket 2 has a groove for the valve body connecting pipe 3 to be connected, and a second spring 11 is fixedly connected to the sealing gasket 2. The other end of the second spring 11 is fixedly connected to a positioning plate 9. When the valve body connecting pipe 3 is connected to the control valve housing 1, the outer side of the valve body connecting pipe 3 and the positioning plate 9 are in close contact. Two sets of the second spring 11 are symmetrically arranged about the center point of the positioning plate 9. A positioning suction cup 7 is fixedly connected to the side of the sealing gasket 2 near the outer shell of the control valve housing 1.

[0025] During assembly, the auxiliary docking rod 4 on the control valve housing 1 is precisely inserted into the docking groove 5 on the sealing gasket 2. At this time, the two sets of limiting blocks 14 with a fan-shaped structure on the outside of the auxiliary docking rod 4 are exactly located in the arc-shaped stabilizing groove 6 connected to the docking groove 5, thereby initially limiting the position of the sealing gasket 2 and preventing it from shifting significantly during subsequent installation. At the same time, the positioning suction cup 7 fixedly connected to the side of the sealing gasket 2 closest to the outer shell of the control valve housing 1 will contact the outer surface of the control valve housing 1. By pressing or other means, some air in the positioning suction cup 7 can be expelled, allowing it to rely on atmospheric pressure to initially adsorb and fix the sealing gasket 2 and the control valve housing 1, further enhancing the initial stability of the connection between the two and laying a good foundation for the subsequent docking and installation of the valve body connecting pipe 3.

[0026] Example 2: Figures 5-7 and Figure 9 The present invention provides the following technical solution: a hydraulic control valve assembly for a hydraulic system, wherein an auxiliary docking rod 4 is fixedly connected to the control valve housing 1, and a stabilizing mechanism is provided on the sealing gasket 2. The stabilizing mechanism corresponds to the auxiliary docking rod 4, and the stabilizing mechanism initially improves the stability of the sealing gasket 2 installation through the docking installation of the valve body connecting pipe 3. The stabilizing mechanism includes a docking groove 5, which is opened on the side of the sealing gasket 2 near the outer shell of the control valve housing 1. When the sealing gasket 2 is initially assembled, the auxiliary docking rod 4 is docked and installed inside the docking groove 5. Two sets of limiting blocks 14 are fixedly connected to the outer side of the auxiliary docking rod 4, and the limiting blocks 14 are arranged in a fan shape. A stabilizing groove 6 is fixedly connected inside the sealing gasket 2, and the stabilizing groove 6 is arc-shaped. The structure is designed so that the stabilizing groove 6 is connected to the docking groove 5. The limiting block 14 can slide along an arc-shaped trajectory within the stabilizing groove 6. An air supply bladder 15 is fixedly connected between one of the positioning plates 9 and the sealing gasket 2. A connecting pipe 16 is connected through one side of the air supply bladder 15. An expansion bladder 17 is fixedly connected inside the stabilizing groove 6. The expansion bladder 17 is connected through the other end of the connecting pipe 16. The expansion bladder 17 is arranged in an arc shape. In the uninflated state, the side of the expansion bladder 17 does not contact the side of the limiting block 14. In the inflated state, the expansion bladder 17 abuts against the limiting block 14 and drives the limiting block 14 to rotate along the stabilizing groove 6. After rotation, the limiting block 14 cannot disengage from the docking groove 5. The positioning plate 9 squeezes the expansion bladder 17 through the abutment action of the valve body connecting pipe 3.

[0027] When the valve body connecting pipe 3 begins to dock with the control valve housing 1, the outer side of the valve body connecting pipe 3 will first contact the positioning plate 9 on the sealing gasket 2. As the valve body connecting pipe 3 continues to advance, the positioning plate 9 will be squeezed by the outer side of the valve body connecting pipe 3 and will move away from the center of the valve body connecting pipe 3, compressing the second spring 11 connected to it. Since there are two sets of second springs 11 symmetrically arranged about the center point of the positioning plate 9, the positioning plate 9 will always be tightly fitted with the outer side of the valve body connecting pipe 3 under the action of the elastic restoring force of the second spring 11. Through multiple sets of such positioning plates 9, the valve body connecting pipe 3 can be clamped and limited from multiple directions to ensure that the valve body connecting pipe 3 will not be radially offset during docking, thereby ensuring the accuracy and stability of docking.

[0028] During the process of the positioning plate 9 being squeezed and moved by the valve body connecting pipe 3, the positioning plate 9 will simultaneously squeeze the air supply bladder 15. The compressed gas inside the air supply bladder 15 is forced into the expansion bladder 17 through the connecting pipe 16, causing the expansion bladder 17, which was originally in an uninflated state, to gradually inflate. Because the expansion bladder 17 has an arc-shaped structure and its position corresponds to the limiting block 14 on the outside of the auxiliary connecting rod 4, its side does not contact the limiting block 14 when it is not inflated. When it inflates to a certain extent, the side of the expansion bladder 17 will abut against the side of the limiting block 14 and apply a thrust to the limiting block 14. Because the limiting block 14 has a fan-shaped structure and the stabilizing groove 6 has an arc-shaped structure, the limiting block 14 can move along the inside of the stabilizing groove 6. The sliding along the arc-shaped trajectory means that under the thrust of the inflatable airbag 17, the limiting block 14 will drive the auxiliary docking rod 4 to rotate along the arc-shaped trajectory of the stabilizing groove 6. After the limiting block 14 rotates to a specific angle, the side of its fan-shaped structure will form a locking relationship with the inner wall of the stabilizing groove 6. At this time, the auxiliary docking rod 4 can no longer be disengaged from the docking groove 5. Triggered by the docking action of the valve body docking pipe 3, the installation force of the valve body docking pipe 3 is converted into the locking force of the stabilizing mechanism, which further improves the stability of the sealing gasket 2 installed on the control valve housing 1. This effectively prevents the sealing gasket 2 from being displaced or loosened due to equipment vibration or fluid impact during the operation of the hydraulic system, thereby ensuring the reliability of the seal.

[0029] Example 3: Figure 5 , Figure 6 , Figure 8 and Figure 9 The technical solution shown in the invention provides the following technical solution: a hydraulic control valve assembly for a hydraulic system, wherein a sealing mechanism is provided inside the sealing gasket 2, and the sealing mechanism further improves the installation stability of the sealing gasket 2 through the docking and installation action of the valve body connecting pipe 3. The sealing mechanism includes a communicating cavity 20, which is opened inside the sealing gasket 2. The inner end of the positioning suction cup 7 is disposed through the communicating cavity 20, and the positioning suction cup 7 has a hole communicating with the communicating cavity 20. After the sealing gasket 2 is initially assembled, the positioning suction cup 7 is adsorbed on the outside of the control valve housing 1, and the sealing gasket... The plate 2 has an air supply chamber 12 inside, and an air supply plate 18 is slidably connected inside the air supply chamber 12. The side of the air supply plate 18 is in contact with the inner wall of the air supply chamber 12. A connecting rod 19 is fixedly connected to the air supply plate 18. A magnetic plate 8 is fixedly connected to the other end of the connecting rod 19. When the valve body connecting pipe 3 is docked with the control valve housing 1, the outer side of the valve body connecting pipe 3 and the magnetic plate 8 are attracted to each other. A first spring 10 is fixedly connected between the magnetic plate 8 and the sealing gasket 2. A ventilation channel 13 is connected through the connecting cavity 20 and the air supply chamber 12. When the valve body connecting pipe 3 is docked, the two sets of connecting rods 19 move away from each other.

[0030] When the valve body connecting pipe 3 begins to connect with the control valve housing 1, since the valve body connecting pipe 3 is usually made of a magnetic metal material, and the magnetic plate 8 itself is magnetic, the outer side of the valve body connecting pipe 3 will generate a magnetic force that attracts each other to the magnetic plate 8. As the valve body connecting pipe 3 continues to connect and install, the attraction of the valve body connecting pipe 3 to the magnetic plate 8 gradually increases, causing the magnetic plate 8 to overcome the tension of the first spring 10 and move away from the center of the sealing gasket 2. The movement of the magnetic plate 8 drives the air supply plate 18, which is fixedly connected to it, to slide synchronously in the air supply chamber 12 via the connecting rod 19. Since the side of the air supply plate 18 is tightly fitted with the inner wall of the air supply chamber 12, forming a good seal, the sliding of the air supply plate 18 away from the center of the sealing gasket 2 will generate a negative pressure inside the air supply chamber 12, which will then draw the gas inside the connecting chamber 20 through the ventilation channel 13. Since the inner end of the positioning suction cup 7 is connected to the connecting chamber 20 through the hole, the negative pressure formed in the connecting chamber 20 will further draw out the air in the positioning suction cup 7, making the air pressure inside the positioning suction cup 7 much lower than the external atmospheric pressure, thereby significantly enhancing the adsorption force of the positioning suction cup 7 on the outer surface of the control valve housing 1. This enhanced adsorption force allows the sealing gasket 2 to fit more tightly and firmly against the outside of the control valve housing 1, effectively filling any tiny gaps that may exist between the sealing gasket 2 and the control valve housing 1. This significantly improves the overall sealing and stability of the connection between the two, thereby effectively preventing high-pressure hydraulic oil from leaking from the connection point during the operation of the hydraulic system. When the sealing gasket 2 needs to be disassembled for maintenance, as the valve body connecting pipe 3 is removed from the control valve housing 1, the adsorption force of the valve body connecting pipe 3 on the magnetic plate 8 disappears. At this time, the first spring 10, which is in a stretched state, will release its stored elastic potential energy, generating a restoring force, which will drive the magnetic plate 8 to move towards the center of the sealing gasket 2. The magnetic plate 8 drives the air supply plate 18 to slide in the opposite direction in the air supply chamber 12 through the connecting rod 19. The air supply chamber 12 stops sucking the connecting chamber 20, and the negative pressure state in the connecting chamber 20 is released. The adsorption force of the positioning suction cup 7 on the control valve housing 1 weakens accordingly, making it easy for the operator to remove the sealing gasket 2 from the control valve housing 1 for cleaning, replacement, and other maintenance work.

[0031] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A hydraulic control valve assembly for a hydraulic system, comprising a control valve housing (1), wherein a valve body connecting pipe (3) is provided on the outer side of the control valve housing (1), and a sealing gasket (2) for improving the sealing performance of the valve body is provided on the outer side of the control valve housing (1), characterized in that, An auxiliary docking rod (4) is fixedly connected to the control valve housing (1). A stabilizing mechanism is provided on the sealing gasket (2). The stabilizing mechanism is positioned corresponding to the auxiliary docking rod (4). The stabilizing mechanism initially improves the stability of the sealing gasket (2) installation through the docking installation of the valve body connecting pipe (3). A sealing mechanism is provided inside the sealing gasket (2). The sealing mechanism further improves the stability of the sealing gasket (2) installation through the docking installation of the valve body connecting pipe (3).

2. The hydraulic control valve assembly for a hydraulic system according to claim 1, characterized in that: The stabilizing mechanism includes a docking groove (5), which is located on the side of the sealing gasket (2) near the outer shell of the control valve housing (1). When the sealing gasket (2) is initially assembled, the auxiliary docking rod (4) is docked inside the docking groove (5).

3. A hydraulic control valve assembly for a hydraulic system according to claim 2, characterized in that: Two sets of limiting blocks (14) are fixedly connected to the outside of the auxiliary docking rod (4), and the limiting blocks (14) are arranged in a fan-shaped structure. The sealing gasket (2) is fixedly connected to a stabilizing groove (6), and the stabilizing groove (6) is opened in an arc-shaped structure. The stabilizing groove (6) is connected to the docking groove (5). The limiting block (14) can slide along an arc-shaped trajectory in the stabilizing groove (6).

4. A hydraulic control valve assembly for a hydraulic system according to claim 3, characterized in that: The sealing gasket (2) has a groove for the valve body connecting pipe (3) to connect, and a second spring (11) is fixedly connected to the sealing gasket (2), and a positioning plate (9) is fixedly connected to the other end of the second spring (11). When the valve body connecting pipe (3) connects to the control valve housing (1), the outer side of the valve body connecting pipe (3) and the positioning plate (9) fit together, and two sets of the second spring (11) are symmetrically arranged about the center point of the positioning plate (9).

5. A hydraulic control valve assembly for a hydraulic system according to claim 4, characterized in that: One of the positioning plates (9) is fixedly connected to the sealing gasket plate (2) with an air supply bag (15), and a connecting pipe (16) is connected through one side of the air supply bag (15). An expansion bag (17) is fixedly connected inside the stabilizing groove (6), and the other end of the expansion bag (17) is connected through the connecting pipe (16). The expansion bag (17) is set in an arc shape. In the uninflated state, the side of the expansion bag (17) does not contact the side of the limiting block (14). In the inflated state, the expansion bag (17) abuts against the limiting block (14) and drives the limiting block (14) to rotate along the stabilizing groove (6). After rotation, the limiting block (14) cannot disengage from the docking groove (5). The positioning plate (9) squeezes the expansion bag (17) through the abutment action of the valve body connecting pipe (3).

6. A hydraulic control valve assembly for a hydraulic system according to claim 5, characterized in that: The sealing mechanism includes a connecting cavity (20), which is located inside the sealing gasket (2). A positioning suction cup (7) is fixedly connected to the side of the sealing gasket (2) near the outer shell of the control valve housing (1). The inner end of the positioning suction cup (7) is inserted through the connecting cavity (20), and the positioning suction cup (7) has a hole that communicates with the connecting cavity (20). After the sealing gasket (2) is initially assembled, the positioning suction cup (7) is adsorbed on the outside of the control valve housing (1).

7. A hydraulic control valve assembly for a hydraulic system according to claim 6, characterized in that: The sealing gasket (2) has an air supply chamber (12) inside, and an air supply plate (18) is slidably connected inside the air supply chamber (12). The side of the air supply plate (18) is in contact with the inner wall of the air supply chamber (12), and a connecting rod (19) is fixedly connected to the air supply plate (18).

8. A hydraulic control valve assembly for a hydraulic system according to claim 7, characterized in that: The other end of the connecting rod (19) is fixedly connected to a magnetic plate (8). When the valve body connecting pipe (3) is connected to the control valve housing (1), the outer side of the valve body connecting pipe (3) and the magnetic plate (8) are attracted to each other. The magnetic plate (8) and the sealing gasket (2) are fixedly connected to a first spring (10).

9. A hydraulic control valve assembly for a hydraulic system according to claim 8, characterized in that: A ventilation channel (13) is provided between the connecting cavity (20) and the air supply cavity (12), and the two sets of connecting rods (19) of the valve body connecting pipe (3) are far apart from each other when they are connected.

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