An active control method for realizing stepless variable stiffness of liquid rubber composite joint

Abstract

This invention discloses an active control method for stepless variable stiffness of a liquid rubber composite joint. The liquid rubber composite joint includes a mandrel and at least one pair of liquid cavities located on both sides of the mandrel. A flow channel 1 and a flow channel 2 are arranged inside the mandrel. One end of flow channel 1 communicates with liquid cavity 1 of the pair of liquid cavities, and one end of flow channel 2 communicates with liquid cavity 2 of the pair of liquid cavities. The active control method involves installing a stepless flow channel control valve device inside the mandrel at the other end of flow channel 1 and flow channel 2, connecting the other ends of flow channel 1 and flow channel 2. By controlling the cross-sectional area of ​​the connection between flow channel 1 and flow channel 2 through the stepless flow channel control valve device, the volume of liquid flowing between flow channel 1 and flow channel 2 can be precisely controlled, thereby changing the dynamic stiffness of the liquid rubber composite joint in real time. This invention enables active control of the variable stiffness of the joint. This invention also solves the problem of liquid leakage.

Description

Technical Field

[0001] This invention relates to an active control method for achieving variable stiffness of liquid rubber composite joints, and more particularly to an active control method for achieving stepless variable stiffness of liquid rubber composite joints. Background Technology

[0002] According to the dynamic requirements, the boom joint provides greater radial stiffness to ensure operational stability and increase critical speed when running at high speed on a straight line (high frequency vibration); and provides less stiffness to ensure curve-crossing performance and reduce wear when crossing curves (low frequency large amplitude). Ordinary joints are difficult to achieve the above characteristics, especially for old lines with greater wear on the wheel, rail and track, resulting in high maintenance costs. Therefore, a new product is needed that has the above characteristics—the liquid rubber composite joint.

[0003] The working principle of the liquid rubber composite swing arm joint is as follows: Two hollow cavities are designed inside the rubber component, connected by a flow channel. One cavity is pre-filled with a sealed, incompressible (viscous) liquid. Under load, the volume of the two cavities changes, and the liquid flows between them, generating damping and consuming vibration energy, thus attenuating vibration. At low frequencies, the liquid flows up and down through the channel, providing significant damping. In high-frequency ranges, the liquid cannot flow quickly enough, resulting in lower damping and effectively isolating vibration. Furthermore, the dynamic stiffness remains relatively stable under high-frequency vibration, preventing dynamic hardening. The system's frequency ratio remains essentially constant, maintaining a good vibration reduction effect.

[0004] Due to the complex operating conditions of rail vehicles, in order to better adapt to the operating environment of rail vehicles, it is necessary to actively control the variable stiffness of the liquid rubber composite joint according to the operating environment of the rail vehicles during operation, thereby changing the dynamic stiffness of the liquid rubber composite joint.

[0005] The applicant filed the following three related patents in 2012:

[0006] 1. Chinese invention patent application publication number CN102644693A, published on August 22, 2012, discloses a method for adjusting the dynamic stiffness of a rubber joint with liquid damping. The method involves providing two or more closed cavities within the rubber joint, which are interconnected by throttling channels. An adjustment device is provided on the throttling channels to control the flow area of ​​the throttling channels. By adjusting the size of the throttling channels through the adjustment device, the damping force can be adjusted to obtain the desired dynamic stiffness of the rubber joint.

[0007] 2. Chinese utility model patent with authorization announcement number CN202756532U and authorization announcement date of February 27, 2013 discloses a rubber joint with a liquid damping stiffness adjustment device, including a rubber joint outer sleeve, a mandrel, and elastic rubber; the elastic rubber is sleeved on the mandrel; a metal outer sleeve is placed on the rubber joint outer sleeve, and the rubber joint is press-fitted into the metal outer sleeve; two or more independent liquid chambers are symmetrically arranged on the rubber joint outer sleeve with the axis as the axis of symmetry, and each independent liquid chamber is interconnected through a throttling channel set on the mandrel. The throttling channel adjustment shaft is located inside the mandrel of the rubber joint and is fixed by a set screw; the parts are sealed with O-rings to prevent leakage.

[0008] 3. Chinese utility model patent with authorization announcement number CN202531730U and authorization announcement date of November 14, 2012 discloses a rubber joint with a liquid automatic damping stiffness adjustment device, including a metal outer sleeve, a rubber body, and a mandrel; the rubber joint is sleeved on the mandrel, and the metal outer sleeve is sleeved on the rubber body to form a rubber joint, and a stiffness adjustment device is provided inside the rubber joint; the stiffness adjustment device includes two or more liquid chambers, which are connected to each other through an adjustable flow channel, and a throttling adjustment device is provided in the adjustable flow channel. The adjustment shaft is located inside the mandrel of the rubber joint, and springs are press-fitted at both ends of the adjustment shaft, and an adjustable stop is connected to the outside of one end of the spring; the adjustable stop is slidably sleeved in a guide block and can move axially along the hole in the guide block under the action of external force; the guide block is fixed by threads in the threaded hole at the end of the throttling channel on the mandrel.

[0009] The variable stiffness of the liquid rubber composite joint in the aforementioned patent documents can be actively controlled by an adjustment device, thereby changing the dynamic stiffness of the liquid rubber composite joint. However, the control methods in the aforementioned patent documents are different from the active control method in this application. Furthermore, while the aforementioned patent documents have improved the liquid rubber composite joint to achieve active control, it is also necessary to consider whether the improved liquid rubber composite joint may leak liquid.

[0010] In summary, designing an active control method for stepless variable stiffness of liquid rubber composite joints, enabling proactive control of the joint's dynamic stiffness based on the rail vehicle's operating environment during operation, is a pressing technical problem. Furthermore, addressing liquid leakage in the liquid rubber composite joint is also a crucial challenge. Summary of the Invention

[0011] The technical problem this invention aims to solve is to address the deficiencies in existing technologies by providing an active control method for stepless variable stiffness of liquid rubber composite joints. This method can actively control the variable stiffness of the liquid rubber composite joint based on the operating environment of the rail vehicle during operation, thereby changing the dynamic stiffness of the joint. Furthermore, this invention also solves the problem of actively controlling liquid leakage in liquid rubber composite joints.

[0012] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: an active control method for realizing stepless variable stiffness of a liquid rubber composite joint, wherein the liquid rubber composite joint includes a mandrel and at least a pair of liquid cavities located on both sides of the mandrel. Flow channel one and flow channel two are arranged inside the mandrel. One end of flow channel one is connected to liquid cavity one of the pair of liquid cavities, and one end of flow channel two is connected to liquid cavity two of the pair of liquid cavities. The active control method involves setting a stepless flow channel control valve device inside the mandrel at the other end of flow channel one and flow channel two, connecting the other ends of flow channel one and flow channel two through the stepless flow channel control valve device. The stepless flow channel control valve device controls the size of the connecting cross-sectional area between flow channel one and flow channel two, thereby accurately controlling the volume of liquid flowing between flow channel one and flow channel two, and changing the dynamic stiffness of the liquid rubber composite joint in real time.

[0013] Preferably, the flow channel stepless control valve device is divided into two parts: a control valve base and a servo electric cylinder. A connecting through hole is opened on the control valve base, and flow channel one and flow channel two are connected through the through hole. Inside the control valve base, a rod that can move back and forth is also provided. A valve plate is provided at one end of the rod. The valve plate passes through the connecting through hole and blocks the middle of the connecting through hole. The servo electric cylinder is connected to the rod.

[0014] The control of the cross-sectional area between flow channel one and flow channel two via the stepless flow control valve device is achieved by the servo electric cylinder driving the rod to move back and forth, thereby controlling the position of the valve plate within the connecting through hole and precisely controlling the opening of the connecting through hole, thus controlling the cross-sectional area between flow channel one and flow channel two.

[0015] Preferably, the control valve base is configured as a closed base structure, and the control valve base is made of a non-magnetic material; a magnet end is provided on the other end of the rod; a seat is provided on the output shaft of the servo electric cylinder, and the seat is made of a metal material that can be attracted by a magnet;

[0016] The phrase "using the servo electric cylinder to drive the rod to move back and forth" refers to the magnetic connection formed by the attraction between the magnet end and the base, which enables the servo electric cylinder to drive the rod to move back and forth.

[0017] Preferably, the control valve base includes a cylindrical body and a rectangular body disposed at one end of the cylindrical body. A connecting through hole extends radially through one end of the long cylindrical closed base. A rod moving cavity is disposed axially inside the cylindrical body. One end of the rod moving cavity communicates with the connecting through hole, and the other end extends all the way to the rectangular body.

[0018] The rod, valve plate, and magnet end are integrated into one unit, which is placed inside the moving cavity of the rod and can move back and forth along the moving cavity. During the back and forth movement, the magnet end always moves within the rectangular body. The seat is configured as a U-shaped seat. After installation, the rectangular body of the control valve base extends into the U-shaped opening of the U-shaped seat.

[0019] Preferably, the mandrel of the liquid rubber composite node is provided with three levels of internal holes, including primary holes, secondary holes and tertiary holes, which are distributed sequentially along the mandrel axis and are interconnected with each other. The diameter of the primary hole is less than the diameter of the secondary hole and less than the diameter of the tertiary hole. One end of the primary hole is also connected to flow channel one and flow channel two. A step section one is formed between the primary hole and the secondary hole, and a step section two is formed between the secondary hole and the tertiary hole.

[0020] A flange is provided at the contact point between the cylindrical body and the rectangular body of the control valve base. During installation, the cylindrical body is inserted into the primary hole so that the flange contacts the stepped part, and then the flange is tightened with screws, so that the cylindrical body is installed in the primary hole.

[0021] Preferably, a sealing ring is also provided between the flange and the stepped portion.

[0022] Preferably, a base plate is provided on one end of the servo electric cylinder. During installation, the servo electric cylinder is inserted into the secondary hole so that the base plate contacts the step portion. Then, the base plate is locked with screws to install the servo electric cylinder in the secondary hole. After installation, the rectangular body of the control valve base extends into the U-shaped seat of the servo electric cylinder.

[0023] Preferably, a damping sleeve is provided between the outer peripheral surface of the servo electric cylinder and the inner peripheral surface of the secondary hole.

[0024] Preferably, the cap is locked in place at the end of the three-stage hole using screw three.

[0025] Preferably, a position sensor is also provided in the secondary hole, and a sensing plate is also provided on the output shaft of the servo electric cylinder. Through the cooperation of the sensor and the sensing plate, the opening degree of the connecting through hole can be precisely controlled.

[0026] The beneficial effects of this invention are as follows: This invention controls the cross-sectional area of ​​the connection between flow channel one and flow channel two through a stepless flow channel control valve device, thereby precisely controlling the volume of liquid flowing between flow channel one and flow channel two, and changing the dynamic stiffness of the liquid rubber composite joint. Therefore, this invention can actively control the variable stiffness of the liquid rubber composite joint according to the operating environment of the rail vehicle during operation, thereby changing the dynamic stiffness of the liquid rubber composite joint. Specifically, by designing the stepless flow channel control valve device, a servo electric cylinder is used as the control power source to drive the valve plate to move precisely, thereby controlling the opening of the connecting through hole precisely, thus realizing the active control of the variable stiffness of the liquid rubber composite joint. The control valve base is set as a closed base structure, and a magnetic connection pair is formed between the rod magnet end located inside the control valve base and the metal seat on the output shaft of the servo electric cylinder located outside the control valve base, so that the servo electric cylinder can drive the rod to move back and forth. In this way, while realizing the active control of the variable stiffness of the liquid rubber composite joint, the problem of liquid leakage caused by the active control of variable stiffness is also solved. By designing the installation method for the flow channel stepless control valve device, the device can be installed conveniently and quickly, improving production efficiency. It also facilitates disassembly and maintenance. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the axial cross-sectional structure of the liquid rubber composite node in an embodiment of the present invention;

[0028] Figure 2 for Figure 1 A partial axial cross-sectional view of the structure located at the stepless control valve device in the flow channel;

[0029] Figure 3 This is a three-dimensional structural diagram of the control valve base in an embodiment of the present invention;

[0030] Figure 4 This is a schematic diagram of the axial cross-sectional structure of the control valve base in an embodiment of the present invention;

[0031] Figure 5 This is an axial cross-sectional view of the rod body, valve plate, and magnet end after they are connected as a single unit in an embodiment of the present invention.

[0032] Figure 6 This is a schematic diagram of the main structure of the servo electric cylinder in an embodiment of the present invention;

[0033] Figure 7 This is a partial three-dimensional structural diagram of the rectangular body of the control valve base and the U-shaped seat of the servo electric cylinder after they are installed in an embodiment of the present invention.

[0034] Figure 8 for Figure 2A partial axial cross-sectional view of the spindle after the flow channel stepless control valve device and cover have been removed.

[0035] In the diagram: 1. Outer sleeve, 2. Spindle, 3. Intermediate spacer, 4. Rubber, 5. Liquid cavity one, 6. Liquid cavity two, 7. Flow channel one, 8. Flow channel two, 9. Control valve base, 911. Cylinder, 912. Rectangular body, 913. Rod moving cavity, 914. Flange, 10. Servo electric cylinder, 101. Output shaft, 102. U-shaped seat, 103. Base plate, 11. Through hole, 12. Rod, 13. Valve plate, 14. Magnet end, 15. Primary hole, 16. Secondary hole, 17. Tertiary hole, 18. Step one, 19. Step two, 20. Screw one, 21. Sealing ring, 22. Screw two, 23. Vibration damping sleeve, 24. Screw three, 25. Cover, 26. Sensor, 27. Induction sensor. Detailed Implementation

[0036] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0037] Example: Figure 1 As shown, one type of liquid rubber composite joint involved in this invention includes an outer sleeve 1, a mandrel 2, and an intermediate spacer 3 added between the outer sleeve 1 and the mandrel 2. The intermediate spacer 3 and the mandrel 2 are vulcanized and bonded together by rubber 4, and then the intermediate spacer 3 and the mandrel are interference-fitted into the outer sleeve 1. The rubber 4 is provided with multiple independent liquid cavities, each containing liquid (not shown in the figure), and the multiple liquid cavities are connected by flow channels. The multiple liquid cavities include those located in... Figure 1 The liquid cavity 5 in the upper middle position and located in Figure 1 The liquid cavity 6 in the lower middle position has a flow channel located inside the mandrel 2, including a first flow channel 7 and a second flow channel 8. One end of the first flow channel 7 is connected to the first liquid cavity 5, and one end of the second flow channel 8 is connected to the second liquid cavity 6. A stepless flow channel control valve is installed inside the mandrel at the other end of the first and second flow channels 7 and 8, and the other ends of the first and second flow channels 7 and 8 are connected through the aforementioned stepless flow channel control valve. In this embodiment, during operation, the cross-sectional area of ​​the connection between the first and second flow channels 7 and 8 is controlled by the stepless flow channel control valve, thereby precisely controlling the volume of liquid flowing between the first and second flow channels 7 and 8, and changing the dynamic stiffness of the liquid rubber composite joint. Therefore, this embodiment can actively control the variable stiffness of the liquid rubber composite joint according to the operating environment of the rail vehicle during operation, thereby changing the dynamic stiffness of the liquid rubber composite joint.

[0038] like Figure 2As shown, the stepless flow control valve device in this embodiment includes a control valve base 9 and a servo cylinder 10. A connecting through-hole 11 is formed in the control valve base 9, connecting flow channel 7 and flow channel 8. Inside the control valve base 9, a movable rod 12 is also provided. A valve plate 13 is provided at one end of the rod 12, passing through the connecting through-hole 11 and blocking the middle of the connecting through-hole 11 to control its opening. The servo cylinder 10 is connected to the rod 12, and by driving the rod 12 to move back and forth, the opening of the connecting through-hole 11 can be precisely controlled.

[0039] Because liquid exists within the liquid rubber composite joint, and rod 12 needs to move back and forth for precise control, liquid leakage is easily caused. To solve this problem, such as Figure 3 and Figure 4 As shown, the applicant sets the control valve base 9 as a closed base structure. The control valve base 9 is made of non-magnetic material and is long cylindrical in this embodiment, including a cylindrical body 911 and a rectangular body 912 disposed at one end of the cylindrical body 911. The connecting through hole 11 penetrates radially through one end of the long cylindrical closed base. A rod moving cavity 913 is disposed axially inside the cylindrical body 911. One end of the rod moving cavity 913 communicates with the connecting through hole 11, and the other end extends to the rectangular body 912. Figure 5 As shown, one end of the rod 12 is connected to a valve plate 13, and the other end of the rod 12 is connected to a magnet end 14. The rod 12, valve plate 13, and magnet end 14 form a single unit, which is placed inside the rod moving cavity 913 and can move back and forth along the rod moving cavity 91. During the back and forth movement, the magnet end 14 always moves within the rectangular body 912. Figure 6 As shown, a U-shaped seat 102 is provided on the output shaft 101 of the servo electric cylinder 10. The U-shaped seat 102 can be made of a metal material that can be attracted by a magnet, such as... Figure 2 and Figure 7As shown, after installation, the rectangular body 912 of the control valve base 9 extends into the U-shaped opening of the U-shaped seat. Since a magnet end 14 is provided inside the rectangular body 912, a magnetic connection is formed through the attraction between the magnet end 14 and the U-shaped seat. This allows the servo cylinder 10 to drive the rod 12, valve plate 13, and magnet end to move back and forth together, precisely controlling the opening of the connecting through hole 11. In this embodiment, the control valve base 9 is a closed structure, thus avoiding liquid leakage from the liquid rubber composite joint. Simultaneously, the magnetic connection design enables the servo cylinder 10 to precisely control the opening of the connecting through hole 11, achieving the goal of actively controlling the variable stiffness of the liquid rubber composite joint according to the operating environment of the rail vehicle.

[0040] The installation of the flow channel stepless control valve device is described below:

[0041] Installation of the control valve base: such as Figure 8 As shown, the mandrel 2 of the liquid rubber composite node is provided with multiple levels of internal holes. In this embodiment, three levels of internal holes are provided, including a primary hole 15, a secondary hole 16, and a tertiary hole 17. These three holes are distributed sequentially along the mandrel axis and are interconnected. The diameter of the primary hole 15 is less than the diameter of the secondary hole 16, which is less than the diameter of the tertiary hole 17. One end of the primary hole 15 is also connected to flow channel 7 and flow channel 8. A step portion 18 is formed between the primary hole 15 and the secondary hole 16, and a step portion 19 is formed between the secondary hole 16 and the tertiary hole 17. Figure 2 and Figure 3 As shown, a flange 914 is also provided at the contact point between the cylindrical body 911 and the rectangular body 912 of the control valve base 9 of the flow channel stepless control valve device. During installation, the cylindrical body 911 is inserted into the primary hole 15, so that the flange 914 contacts the step portion 18. Then, the flange 914 is tightened with screw 20, thereby installing the cylindrical body 911 in the primary hole 15. After installation, the two ends of the connecting through hole 11 on the cylindrical body 911 are connected to the first flow channel 7 and the second flow channel 8, respectively. The rectangular body 912 of the control valve base 9 is located in the secondary hole 16. To further prevent liquid leakage, a sealing ring 21 can be added between the flange 914 and the step portion 18.

[0042] Installation of servo electric cylinders: such as Figure 2 and Figure 6As shown, a base plate 103 is provided on one end of the servo cylinder 10. During installation, the servo cylinder 10 is inserted into the secondary hole 16, so that the base plate 103 contacts the step portion 19. Then, the base plate 103 is locked with screws 22, thereby installing the servo cylinder 10 in the secondary hole 16. After installation, the rectangular body 912 of the control valve base 9 extends into the U-shaped seat of the servo cylinder 10. A vibration damping sleeve 23 is also provided between the outer peripheral surface of the servo cylinder 10 and the inner peripheral surface of the secondary hole 16 to protect the servo cylinder.

[0043] After the servo electric cylinder is installed, the cover 25 is finally locked onto the end of the three-stage hole 17 using screw 3 24, thus completing the installation of the flow channel stepless control valve device.

[0044] like Figure 2 As shown, in order to further actively control the flow channel stepless control valve device, a position sensor 26 is also provided in the secondary hole 16, and a sensing plate 27 is also provided on the output shaft 101 of the servo electric cylinder 10. Through the cooperation of the sensor 26 and the sensing plate 27, the opening degree of the connecting through hole 11 can be precisely controlled.

[0045] In summary, this invention controls the cross-sectional area of ​​the connection between flow channel one and flow channel two through a stepless flow control valve device, thereby precisely controlling the volume of liquid flowing between flow channel one and flow channel two and changing the dynamic stiffness of the liquid rubber composite joint. Therefore, this invention can actively control the variable stiffness of the liquid rubber composite joint according to the operating environment of the rail vehicle during operation, thus changing the dynamic stiffness of the liquid rubber composite joint. Specifically, by designing the stepless flow control valve device, a servo electric cylinder is used as the control power source to drive the valve plate to move precisely, thereby controlling the opening of the connecting through hole precisely, thus achieving active control of the variable stiffness of the liquid rubber composite joint. The control valve base is set as a closed base structure, and a magnetic connection pair is formed between the rod magnet end located inside the control valve base and the metal seat on the output shaft of the servo electric cylinder located outside the control valve base. This allows the servo electric cylinder to drive the rod to move back and forth, thus achieving active control of the variable stiffness of the liquid rubber composite joint while solving the problem of liquid leakage caused by active control of variable stiffness. By designing the installation method for the flow channel stepless control valve device, the device can be installed conveniently and quickly, improving production efficiency. It also facilitates disassembly and maintenance.

[0046] In this embodiment, "multiple" refers to "two or more". The above embodiments are for illustrative purposes only and are not intended to limit the invention. Those skilled in the art can make various changes or modifications without departing from the spirit and scope of the invention. Therefore, all equivalent technical solutions should also fall within the protection scope of this invention, which is defined by the claims.

Claims

1. A method for actively controlling the stepless variable stiffness of a liquid rubber composite joint, wherein the liquid rubber composite joint includes a mandrel and at least one pair of liquid cavities located on both sides of the mandrel, a flow channel one and a flow channel two are provided inside the mandrel, one end of flow channel one communicates with liquid cavity one of the pair of liquid cavities, and one end of flow channel two communicates with liquid cavity two of the pair of liquid cavities, characterized in that: The active control method involves installing a stepless flow channel control valve device inside the mandrel at the other end of flow channel one and flow channel two, connecting the other ends of flow channel one and flow channel two through the stepless flow channel control valve device; controlling the size of the connecting cross-sectional area between flow channel one and flow channel two through the stepless flow channel control valve device, thereby accurately controlling the volume of liquid flowing between flow channel one and flow channel two, and changing the dynamic stiffness of the liquid rubber composite node in real time. The flow channel stepless control valve device is divided into two parts: a control valve base and a servo electric cylinder. A connecting through hole is opened on the control valve base, and flow channel one and flow channel two are connected through the through hole. Inside the control valve base, there is also a rod that can move back and forth. A valve plate is provided at one end of the rod. The valve plate passes through the connecting through hole and blocks the middle of the connecting through hole. The servo electric cylinder is connected to the rod. The control of the cross-sectional area between flow channel one and flow channel two by the stepless control valve device is achieved by the servo electric cylinder driving the rod to move back and forth, thereby controlling the position of the valve plate in the connecting through hole and precisely controlling the opening of the connecting through hole, thereby controlling the cross-sectional area between flow channel one and flow channel two. The control valve base is configured as a closed base structure and is made of a non-magnetic material; a magnet is provided at the other end of the rod; a seat is provided on the output shaft of the servo electric cylinder and the seat is made of a metal material that can be attracted by a magnet. The phrase "moving the rod back and forth via the servo electric cylinder" refers to the magnetic connection formed by the attraction between the magnet end and the base, thereby enabling the servo electric cylinder to move the rod back and forth. A vibration damping sleeve is also installed between the servo electric cylinder and the spindle.

2. The active control method according to claim 1, characterized in that: The control valve base includes a cylindrical body and a rectangular body disposed at one end of the cylindrical body. A connecting through hole extends radially through one end of the long cylindrical closed base. A rod moving cavity is provided inside the cylindrical body along the axial direction of the cylindrical body. One end of the rod moving cavity is connected to the connecting through hole, and the other end extends all the way to the rectangular body. The rod, valve plate, and magnet end are integrated into one unit, which is placed inside the moving cavity of the rod and can move back and forth along the moving cavity. During the back and forth movement, the magnet end always moves within the rectangular body. The seat is configured as a U-shaped seat. After installation, the rectangular body of the control valve base extends into the U-shaped opening of the U-shaped seat.

3. The active control method according to claim 2, characterized in that: The mandrel of the liquid rubber composite node is provided with three levels of internal holes, including primary holes, secondary holes and tertiary holes. The three are distributed sequentially along the mandrel axis and are interconnected with each other. The diameter of the primary hole is less than the diameter of the secondary hole and less than the diameter of the tertiary hole. One end of the primary hole is also connected to flow channel one and flow channel two. A step section one is formed between the primary hole and the secondary hole, and a step section two is formed between the secondary hole and the tertiary hole. A flange is provided at the contact point between the cylindrical body and the rectangular body of the control valve base. During installation, the cylindrical body is inserted into the primary hole so that the flange contacts the stepped part, and then the flange is tightened with screws, so that the cylindrical body is installed in the primary hole.

4. The active control method according to claim 3, characterized in that: A sealing ring is also provided between the flange and the step portion.

5. The active control method according to claim 3 or 4, characterized in that: A base plate is provided on one end of the servo electric cylinder. During installation, the servo electric cylinder is inserted into the secondary hole so that the base plate contacts the step part. Then, the base plate is locked with screws so that the servo electric cylinder is installed in the secondary hole. After installation, the rectangular body of the control valve base extends into the U-shaped seat of the servo electric cylinder.

6. The active control method according to claim 5, characterized in that: A vibration damping sleeve is also provided between the outer circumferential surface of the servo electric cylinder and the inner circumferential surface of the secondary hole.

7. The active control method according to claim 5, characterized in that: Use screw three to lock the cap to the end of the three-stage hole.

8. The active control method according to claim 3 or 4, characterized in that: A position sensor is also installed in the secondary hole, and a sensing plate is also installed on the output shaft of the servo electric cylinder. Through the cooperation of the sensor and the sensing plate, the opening degree of the connecting through hole can be precisely controlled.

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