A high-frequency-response cartridge valve using a digital rotary valve

Abstract

The present invention relates to a high-frequency response cartridge valve using a digital rotary valve. The digital rotary valve assembly is connected to the digital rotary valve spool through a servo drive mechanism, and is connected to the valve position feedback lead screw in the cartridge valve mechanical feedback main valve assembly through the digital rotary valve sleeve. The valve position feedback lead screw is connected to the cartridge valve spool. The servo drive mechanism drives the digital valve spool to rotate, the digital rotary valve port opens, high-pressure oil enters the A1 and A2 control chambers in the main valve assembly of the digital cartridge valve, pushes the cartridge valve spool to move, and the valve position feedback lead screw makes the digital rotary valve sleeve rotate in the same direction, completing the action of opening or closing the cartridge valve port, thereby accurately controlling the spool opening of the high-frequency response cartridge valve. Through the high-precision mechanical feedback structure of the valve position feedback lead screw, the present invention converts the angular displacement generated when the servo motor rotates into the axial linear displacement of the cartridge valve spool. The rotation angle of the servo motor and the axial movement distance of the spool are in a linear relationship, and the control accuracy and fast response of the main valve position of the high-frequency response cartridge valve can be achieved.

Description

Technical Field

[0001] The present invention relates to a hydraulic transmission cover type cartridge valve, and particularly to a high-frequency response cartridge valve using a digital rotary valve. Background Art

[0002] High-frequency response cartridge valves were introduced abroad in the 1970s and are applied in various industries of industrial production. After decades of development and improvement of theory, technology and products, they cover 9 types of products with nominal diameters from DN16 to DN160, 2 to 3 types of valve port forms, and the mounting holes of the valves meet the relevant requirements of GB / T 2877 (ISO7368.2) standard. The frequency response has been greatly improved compared with early products. The pilot valve can be controlled by a servo valve or a proportional valve. For high-frequency response cartridge valves with higher frequency response requirements, a servo valve is used for the pilot valve; for high-frequency response cartridge valves with lower frequency response requirements, a proportional valve can be used for the pilot valve. In addition, most of the current high-frequency response cartridge valves integrate electronic controllers in two forms: analog control and digital control, and some manufacturers also introduce controllers with bus control functions.

[0003] However, whether a servo valve or a proportional valve is used as the pilot control valve, it has high requirements for the machining accuracy of the valve and the cleanliness of the oil, which also reduces the overall reliability of the high-frequency response cartridge valve.

[0004] In addition, an LVDT displacement sensor needs to be connected to the main spool of the high-frequency response cartridge valve, and the signal is fed back to the controller of the pilot valve to form an electrical closed loop. It is necessary to prevent internal and external electromagnetic interference. Therefore, the structure and control of this type of high-frequency response cartridge valve are relatively complex. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the above-mentioned defects of the prior art and provide a high-frequency cartridge valve driven by a digital rotary valve to achieve high-precision position and fast response control of the main valve of the cartridge valve.

[0006] To solve the above technical problem, the technical solution of the present invention is: a high-frequency response cartridge valve using a digital rotary valve, which is composed of a digital rotary valve assembly and a cartridge valve mechanical feedback main valve assembly. The digital rotary valve assembly connects the digital rotary valve spool and the digital rotary valve sleeve through a servo drive mechanism, and connects the valve position feedback lead screw in the cartridge valve mechanical feedback main valve assembly through the digital rotary valve sleeve. The valve position feedback lead screw is connected to the cartridge valve spool. The servo drive mechanism drives the digital valve spool to rotate, the digital rotary valve port opens, high-pressure oil enters the A1 control chamber and the A2 control chamber in the digital cartridge valve main valve assembly, pushes the cartridge valve spool to move, and the valve position feedback lead screw makes the digital rotary valve sleeve rotate in the same direction, completing the action of opening or closing the cartridge valve port, and converting the angular displacement generated when the servo motor rotates into the axial linear displacement of the cartridge valve spool, so as to accurately control the opening of the spool of the high-frequency response cartridge valve.

[0007] Furthermore, the servo drive mechanism uses a servo motor, a stepper motor, or a rotary driving torque motor.

[0008] Furthermore, a digital rotary valve spool is installed in the digital rotary valve body of the digital rotary valve assembly. The upper end of the digital rotary valve spool is connected to the servo motor through a cross slider coupling I. A digital rotary valve sleeve is sleeved outside the digital rotary valve spool. The lower end of the digital rotary valve sleeve is connected to the valve position feedback lead screw in the cartridge valve mechanical feedback main valve assembly through a cross slider coupling II.

[0009] Furthermore, when the servo motor drives the digital rotary valve spool to rotate and the valve port opens, the high-pressure oil pushes the cartridge valve spool to axially move, driving the valve position feedback lead screw and the digital rotary valve sleeve to rotate in the same direction, and performing the actions of opening or closing the main valve ports CA and CB of the cartridge valve.

[0010] Furthermore, the upper end of the cover body in the cartridge valve mechanical feedback main valve assembly is fixedly connected to the digital rotary valve assembly, and the lower end is connected to the cartridge valve sleeve. A cartridge valve spool is installed in the cover body and the cartridge valve sleeve. The upper end of the cartridge valve spool is connected to the valve position feedback lead screw through a ball pressing sleeve and a lead screw ball.

[0011] Furthermore, an A1 control chamber and an A2 control chamber are formed between the cartridge valve spool and the cover body, forming an active control piston configuration of the cartridge valve spool.

[0012] Furthermore, high-precision steel balls are installed between the cartridge valve spool and the cartridge valve sleeve, and anti-rotation pins are installed between the cover body and the cartridge valve sleeve to prevent the relative rotation of the cartridge valve spool, the cartridge valve sleeve, and the cover body.

[0013] Furthermore, the digital rotary valve assembly includes four oil ports, P, T, A, and B, and realizes the supply of pressure oil to the A1 control chamber and the A2 control chamber through the relative rotational movement of the digital rotary valve spool and the digital rotary valve sleeve.

[0014] Furthermore, the valve position feedback lead screw and the lead screw ball constitute the mechanical feedback of the cartridge valve spool, converting the axial movement of the cartridge valve spool into the rotational movement of the digital rotary valve sleeve.

[0015] Furthermore, the main valve port of the high-frequency response cartridge valve is in the structural form of a two-way, three-way, or four-way valve port.

[0016] Advantages of the present invention:

[0017] 1. The servo motor has a fast response and high angular control accuracy. The response and control accuracy of the valve are improved compared with traditional high-frequency response cartridge valves.

[0018] 2. The digital rotary valve adopts a mechanical feedback configuration, without the interference often existing in the electrical feedback loop, and has higher reliability.

[0019] 3. The form of high-precision ball screw mechanical feedback features high position accuracy and higher reliability;

[0020] 4. Compared with the traditional structural form that uses servo valves or proportional valves as pilot control valves, it has less throttling loss and is more green and energy-saving;

[0021] 5. The structure is simpler, operation and maintenance are more convenient, and the maintenance cost is lower. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a sectional view of the high-frequency response cartridge valve with a digital rotary valve of the present invention;

[0023] Figure 2 It is a schematic diagram of the high-frequency response cartridge valve with a digital rotary valve of the present invention;

[0024] Figure 3 It is an external view of the high-frequency response cartridge valve with a digital rotary valve of the present invention;

[0025] Reference numerals: 101. Digital rotary valve assembly, 102. Cartridge valve mechanical feedback main valve assembly, 1. Servo motor, 2. Cross slider coupling one, 3. Digital rotary valve spool, 4. Digital rotary valve body, 5. Digital rotary valve sleeve, 6. Cross slider coupling two, 7. Cover body, 8. Compression sealing seat, 9. Angular contact ball bearing, 10. Valve position feedback lead screw, 11. Ball compression sleeve, 12. Lead screw balls, 13. Cartridge valve spool, 14. Anti-rotation pin, 15. High-precision steel balls, 16. Cartridge valve sleeve, CA. Oil port of the bottom cavity of the main valve of the cartridge valve, CB. Oil port of the side cavity of the main valve of the cartridge valve, X. External control oil port of the cartridge valve, Y. Oil return port of the cartridge valve, P. Oil inlet of the digital rotary valve, A. Control cavity one of the digital rotary valve, B. Control cavity two of the digital rotary valve, T. Oil return port of the digital rotary valve. DETAILED DESCRIPTION OF THE INVENTION

[0026] For the convenience of understanding the present invention, the present invention will be described in more detail and comprehensively below. The drawings show an embodiment of the present invention. The present invention can be implemented in different forms and is not limited to this embodiment.

[0027] As Figures 1 to 3As shown in the figure, the high-frequency response cartridge valve of the digital cylinder using a digital valve in the present invention mainly consists of two parts: a digital rotary valve assembly 101 and a cartridge valve mechanical feedback main valve assembly 102. The digital rotary valve assembly 101 mainly includes a servo motor 1, a cross-slider coupling one 2, a digital rotary valve spool 3, a digital rotary valve body 4, a digital rotary valve sleeve 5, a cross-slider coupling two 6, etc. The digital rotary valve body 4 is equipped with a digital rotary valve spool 3. The upper end of the digital rotary valve spool 3 is connected to the servo motor 1 through the cross-slider coupling one 2. The digital rotary valve spool 3 is externally sleeved with a digital rotary valve sleeve 5. The lower end of the digital rotary valve sleeve 5 is connected to the valve position feedback lead screw 10 in the cartridge valve mechanical feedback main valve assembly 102 through the cross-slider coupling two 6.

[0028] The cartridge valve mechanical feedback main valve assembly 102 mainly consists of a cover body 7, a pressing and sealing seat 8, an angular contact ball bearing 9, a valve position feedback lead screw 10, a ball pressing sleeve 11, a lead screw ball 12, a cartridge valve spool 13, an anti-rotation pin 14, a high-precision steel ball 15, a cartridge valve sleeve 16, etc. The upper end of the cover body 7 is fixedly connected to the digital rotary valve assembly 101, and the lower end is connected to the cartridge valve sleeve 16. The cover body 7 and the cartridge valve sleeve 16 are equipped with a cartridge valve spool 13. The upper end of the cartridge valve spool 13 is connected to the valve position feedback lead screw 10 through the ball pressing sleeve 11 and the lead screw ball 12.

[0029] In addition, both ends of the cross-slider coupling one 2 are respectively connected to the servo motor 1 and the digital rotary valve spool 3. Both ends of the cross-slider coupling two 6 are respectively connected to the digital rotary valve sleeve 5 and the valve position feedback lead screw 10.

[0030] In addition, when the servo motor 1 drives the digital rotary valve spool 3 to rotate and open the valve port, the high-pressure oil pushes the cartridge valve spool 13 to move axially, and drives the digital rotary valve sleeve 5 and the valve position feedback lead screw 10 to rotate in the same direction, closing the digital rotary valve port, and thus realizing the action of opening or closing the main valve ports CA and CB of the cartridge valve.

[0031] In addition, the cartridge valve spool 13 and the cover body 7 form an A1 control chamber and an A2 control chamber, forming an active control piston configuration of the cartridge valve spool 13.

[0032] In addition, the digital rotary valve assembly 101 includes four oil ports: P, T, A, and B. Among them, P is a high-pressure port externally connected to the pump station for oil supply, the T port is connected to the oil tank for oil return, the A port is connected to the A1 control chamber, and the B port is connected to the A2 control chamber. The pressure oil supply to the A1 and A2 control chambers is realized through the relative rotational movement of the digital rotary valve spool 3 and the digital rotary valve sleeve 5.

[0033] In addition, when the servo motor 1 rotates forward to drive the digital rotary valve spool 3 to rotate and open the valve port, the P port and the B port are connected to the A1 control chamber, and at the same time, the A2 control chamber is connected to the A port and the T port for oil return. At this time, the high-pressure oil at the P port enters the A1 control chamber to push the cartridge valve spool 13 to move in the direction of closing the valve, and through the valve position feedback lead screw 10 and the valve sleeve 6 rotating in the same direction integrally, the digital rotary valve port is closed and the cartridge valve spool 13 stops moving.

[0034] In addition, when the servo motor 1 rotates reversely to drive the digital rotary valve spool 3 to rotate and open the valve port, the P port and the A port are connected to the A2 control chamber, and at the same time, the A1 control chamber is connected to the B port and the T port for oil return. At this time, the high-pressure oil at the P port enters the A2 control chamber to push the cartridge valve spool 13 to move in the direction of opening the valve, and through the valve position feedback lead screw 10 and the valve sleeve 6 rotating in the same direction integrally, the digital rotary valve port is closed and the cartridge valve spool 13 stops moving.

[0035] In addition, when the servo motor 1 rotates continuously, the cartridge valve spool 13 can be made to move continuously to open or close the main valve ports CA and CB of the cartridge valve. The rotation angle of the servo motor determines the position of the cartridge valve spool; the rotation direction of the servo motor 1 determines the movement direction of the cartridge valve spool 13; the rotation speed of the servo motor 1 determines the movement speed of the cartridge valve spool 13; the stroke of the cartridge valve spool 13 depends on the angular rotation increment of the servo motor, and the response time of the cartridge valve spool 13 depends on the control signal input by the servo motor.

[0036] In addition, the valve position feedback lead screw 10 and the lead screw ball 12 form a mechanical feedback of the position of the cartridge valve spool 13. Through the high-precision mechanical feedback structure of the valve position feedback lead screw, the angular displacement generated when the servo motor rotates is converted into the axial linear displacement of the cartridge valve spool 13. There is a linear relationship between the rotation angle of the servo motor and the axial movement distance of the valve spool, and the control accuracy and fast response of the main valve position of the high-frequency response cartridge valve can be achieved.

[0037] In a preferred embodiment of the present invention, high-precision steel balls are installed between the cartridge valve spool 13 and the cartridge valve sleeve 16, and anti-rotation pins are installed between the cover body 7 and the cartridge valve sleeve 16 to prevent the relative rotation of the cartridge valve spool 13, the cartridge valve sleeve 16 and the cover body 7.

[0038] The above embodiments only illustrate one of several cases of the present invention and should not be construed as a limitation on the patent of the present invention. On the basis of this embodiment, certain improvements can still be made to the high-frequency response cartridge valve of the present invention. Therefore, the patent protection scope of the present invention should be subject to the appended claims.

Claims

1. A high-frequency response cartridge valve using a digital rotary valve, characterized in that: It consists of two parts: a digital rotary valve assembly and a cartridge valve mechanical feedback main valve assembly. The digital rotary valve assembly connects the digital rotary valve spool and the digital rotary valve sleeve through a servo drive mechanism, and connects the valve position feedback lead screw in the cartridge valve mechanical feedback main valve assembly through the digital rotary valve sleeve. The valve position feedback lead screw is connected to the cartridge valve spool. The servo drive mechanism drives the digital valve spool to rotate, the digital rotary valve port opens, and high-pressure oil enters the A1 control chamber and the A2 control chamber in the cartridge valve main valve assembly, pushing the cartridge valve spool to move. The valve position feedback lead screw causes the digital rotary valve sleeve to rotate in the same direction, completing the action of opening or closing the cartridge valve port, converting the angular displacement generated when the servo motor rotates into the axial linear displacement of the cartridge valve spool, so as to accurately control the opening of the high-frequency response cartridge valve spool; Inside the digital rotary valve body in the digital rotary valve assembly, there is a digital rotary valve spool. The upper end of the digital rotary valve spool is connected to the servo motor through a cross-slider coupling I. The outer sleeve of the digital rotary valve spool is connected to the digital rotary valve sleeve. The lower end of the digital rotary valve sleeve is connected to the valve position feedback lead screw in the cartridge valve mechanical feedback main valve assembly through a cross-slider coupling II; When the servo motor drives the digital rotary valve spool to rotate and the valve port opens, the high-pressure oil pushes the cartridge valve spool to move axially, driving the valve position feedback lead screw and the digital rotary valve sleeve to rotate in the same direction, performing the action of opening or closing the main valve ports CA and CB of the cartridge valve; The upper end of the cover body in the cartridge valve mechanical feedback main valve assembly is fixedly connected to the digital rotary valve assembly, and the lower end is connected to the cartridge valve sleeve. The cover body and the cartridge valve sleeve are equipped with a cartridge valve spool. The upper end of the cartridge valve spool is connected to the valve position feedback lead screw through a ball pressing sleeve and a lead screw ball.

2. The high-frequency response cartridge valve using a digital rotary valve according to claim 1, characterized in that: The servo drive mechanism adopts a servo motor or a stepping motor or a rotary driving torque motor.

3. The high-frequency response cartridge valve using a digital rotary valve according to claim 1, characterized in that: An A1 control chamber and an A2 control chamber are formed between the cartridge valve spool and the cover body, forming an active control piston configuration of the cartridge valve spool.

4. The high-frequency response cartridge valve using a digital rotary valve according to claim 1, characterized in that: High-precision steel balls are installed between the cartridge valve spool and the cartridge valve sleeve, and anti-rotation pins are installed between the cover body and the cartridge valve sleeve to prevent the relative rotation of the cartridge valve spool, the cartridge valve sleeve and the cover body.

5. The high-frequency response cartridge valve using a digital rotary valve according to claim 1, characterized in that: The digital rotary valve assembly includes four oil ports: P, T, A, and B, and realizes the supply of pressure oil to the A1 control chamber and the A2 control chamber through the relative rotational movement of the digital rotary valve spool and the digital rotary valve sleeve.

6. The high-frequency response cartridge valve using a digital rotary valve according to claim 1, characterized in that: The valve position feedback lead screw and the lead screw ball constitute the mechanical feedback of the cartridge valve spool, converting the axial movement of the cartridge valve spool into the rotational movement of the digital rotary valve sleeve.

7. The high-frequency response cartridge valve using a digital rotary valve according to claim 1, characterized in that: The main valve port of the high-frequency response cartridge valve is in the structural form of a two-way or three-way or four-way valve port.

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