Penetrating shaft type linear motor digital valve

Abstract

The invention discloses a penetrating shaft type linear motor digital valve, and belongs to the technical field of digital valves, the penetrating shaft type linear motor digital valve comprises a valve body, a valve core is arranged in the valve body, the valve core is transversely arranged and penetrates through the valve body, the valve core axially moves in the valve body, the right end of the valve core is connected with a motor screw rod, the valve core and the motor screw rod are coaxially arranged, and the motor screw rod is fixedly connected with the valve body. The motor screw is connected with a motor body, and the motor body is fixedly arranged at the right end of the valve body. According to the penetrating shaft type linear motor digital valve, open-loop control can be achieved, closed-loop control can also be formed in combination with different feedback modes, the rotor of the motor body is controlled to rotate, the motor screw and the valve element move in the axial direction, and therefore the opening amount of the digital valve is controlled, and the position and speed of an executing mechanism are controlled; the hydraulic control precision is improved, the control element structure is simplified, and the control element manufacturing difficulty is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of digital valves, and in particular to a through-axis linear motor digital valve. Background Art

[0002] Hydraulic transmission is a commonly used transmission method that uses hydraulic pressure to complete the process of energy transfer. Hydraulic transmission has the advantages of high power density, flexible layout, convenient operation, and high cost performance, and has been widely valued. The actuator in the hydraulic system converts the hydraulic energy of the medium into mechanical energy. Commonly used actuators include hydraulic cylinders and hydraulic motors. In order for the actuator to meet various motion requirements, a variety of control elements are required for adjustment and control.

[0003] With the development of technology, higher requirements are put forward for hydraulic control accuracy. To accurately control the direction, position or speed of the actuator, proportional valves or servo valves are often used. The full name of the proportional valve is the electro-hydraulic proportional valve. It is a hydraulic valve that converts the input electrical signal into force or displacement in proportion, thereby continuously controlling parameters such as pressure and flow. The proportional valve consists of two parts: a DC proportional solenoid and a hydraulic valve. The hydraulic valve part is not much different from the general hydraulic valve, but the DC proportional solenoid is different from the solenoid used in the general solenoid valve. The use of the proportional solenoid can obtain a displacement output and suction output proportional to the given current. The full name of the servo valve is the electro-hydraulic servo valve. It is a key component in electro-hydraulic servo control. It is a hydraulic control valve that receives analog electrical signals and outputs modulated flow and pressure accordingly. The electro-hydraulic servo valve has the advantages of fast dynamic response, high control accuracy, and long service life. It has been widely used in electro-hydraulic servo control systems in the fields of aviation, aerospace, ships, metallurgy, and chemical industry. However, the proportional valve and servo valve have complex structures, high manufacturing difficulty, high price, inconvenient debugging, poor environmental tolerance, and high failure rate.

[0004] The digital valve directly controls the displacement of the valve core through digital signals, thereby achieving flow or pressure control. It is an intelligent hydraulic control component that integrates electronic technology, computer technology and hydraulic technology. The digital valve can be directly interfaced with the computer without the need for a D / A converter. It has a simple structure and low price, and has strong anti-pollution and anti-interference capabilities. It also has higher control accuracy, and the accuracy level can be set as needed to achieve more precise control. Summary of the invention

[0005] The purpose of the present invention is to provide a through-axis linear motor digital valve, which controls the rotation of the rotor of the motor body to cause the motor screw and the valve core to produce axial movement, thereby controlling the opening amount of the digital valve, and then controlling the position and speed of the actuator, ultimately improving the accuracy of hydraulic control, simplifying the control element structure, and reducing the difficulty of manufacturing the control element.

[0006] To achieve the above-mentioned purpose, the present invention provides a through-axis linear motor digital valve, including a valve body, a valve core is arranged in the valve body, the valve core is arranged horizontally and passes through the valve body, the valve core moves axially in the valve body, the right end of the valve core is connected to a motor screw, the valve core and the motor screw are arranged coaxially, the motor screw is connected to the motor body, and the motor body is fixedly arranged at the right end of the valve body.

[0007] Preferably, a transverse valve core cavity is arranged in the middle of the valve body, an oil inlet is arranged at the top of the valve body, a first working oil port is arranged on the left side of the oil inlet, a second working oil port is arranged on the right side of the oil inlet, and an oil return port is arranged at the bottom of the valve body, and the oil inlet, the first working oil port, the second working oil port and the oil return port are all connected to the valve core cavity.

[0008] Preferably, a first valve cavity is provided at a position where the bottom end of the first working oil port communicates with the valve core cavity, and a second valve cavity is provided at a position where the bottom end of the second working oil port communicates with the valve core cavity.

[0009] Preferably, the valve core is located in the valve core cavity, a left sealing shoulder is provided at the left end of the valve core, a right sealing shoulder is provided at the right end of the valve core, a first valve core shoulder is provided at the matching position between the middle section of the valve core and the first valve cavity, and a second valve core shoulder is provided at the matching position between the middle section of the valve core and the second valve cavity.

[0010] Preferably, the left port of the oil return port is located between the left sealing shoulder and the first valve core shoulder, and the right port of the oil return port is located between the right sealing shoulder and the second valve core shoulder.

[0011] Preferably, the left port and the right port are communicated with each other inside the valve body.

[0012] Therefore, the present invention adopts the above-mentioned through-axis linear motor digital valve, and controls the rotation of the rotor of the motor body to make the motor screw and the valve core move axially, thereby controlling the opening amount of the digital valve, and then controlling the position and speed of the actuator, thereby improving the accuracy of hydraulic control, simplifying the structure of the control element, and reducing the difficulty of manufacturing the control element.

[0013] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of an embodiment of a through-axis linear motor digital valve of the present invention;

[0015] Figure 2 It is a schematic diagram of the operation of a through-axis linear motor digital valve embodiment of the present invention, in which the motor screw is right-handed and the rotor rotates clockwise;

[0016] Figure 3 It is a schematic diagram of the operation of a through-axis linear motor digital valve embodiment of the present invention, in which the motor screw is right-handed and the rotor rotates counterclockwise.

[0017] Reference numerals

[0018] 1. Valve body; 11. Valve core cavity; 12. Left port; 13. First valve cavity; 14. Second valve cavity; 15. Right port; 2. Valve core; 21. Left sealing shoulder; 22. First valve core shoulder; 23. Second valve core shoulder; 24. Right sealing shoulder; 3. Motor screw; 4. Motor body; P, oil inlet; A, first working oil port; B, second working oil port; T, oil return port. DETAILED DESCRIPTION

[0019] The technical solution of the present invention is further described below through the accompanying drawings and embodiments.

[0020] Unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0021] Embodiment 1

[0022] The present invention provides a through-axis linear motor digital valve, the structure of which is as follows: Figure 1 As shown, it includes a valve body 1, a valve core 2 is arranged inside the valve body 1, the valve core 2 is arranged horizontally and passes through the valve body 1, the valve core 2 can move axially inside the valve body 1, the right end of the valve core 2 is connected to a motor screw 3, the valve core 2 and the motor screw 3 are coaxially arranged, the motor screw 3 is connected to the motor body 4, and the motor body 4 is fixedly arranged at the right end of the valve body 1.

[0023] A transverse valve core cavity 11 is provided in the middle of the valve body 1, and the valve core cavity 11 horizontally runs through the entire valve body 1 from left to right. An oil inlet P is provided at the top of the valve body 1, a first working oil port A is provided on the left side of the oil inlet P, and a second working oil port B is provided on the right side of the oil inlet P. The oil inlet P, the first working oil port A and the second working oil port B are vertically arranged in parallel. An oil return port T is provided at the bottom of the valve body 1, and the oil inlet P, the first working oil port A, the second working oil port B and the oil return port T are all connected to the valve core cavity 11. A first valve cavity 13 is provided at the position where the bottom end of the first working oil port A is connected to the valve core cavity 11, and a second valve cavity 14 is provided at the position where the bottom end of the second working oil port B is connected to the valve core cavity 11.

[0024] The valve core 2 is located in the valve core cavity 11. The left end of the valve core 2 is provided with a left sealing shoulder 21, and the right end of the valve core 2 is provided with a right sealing shoulder 24. The left sealing shoulder 21 and the right sealing shoulder 24 can maintain pressure while preventing high-pressure oil from leaking and polluting the environment. The middle section of the valve core 2 is provided with a first valve core shoulder 22 at the position where it cooperates with the first valve cavity 13, and the middle section of the valve core 2 is provided with a second valve core shoulder 23 at the position where it cooperates with the second valve cavity 14.

[0025] The left port 12 of the oil return port T is located between the left sealing shoulder 21 and the first valve core shoulder 22, and the right port 15 of the oil return port T is located between the right sealing shoulder 24 and the second valve core shoulder 23. The left port 12 and the right port 15 are connected inside the valve body 1 and are connected to the oil return port T together.

[0026] When the through-axis linear motor digital valve described in the present invention is working, since the valve core 2 and the motor screw 3 are connected, the motor screw 3 and the valve core 2 are axially moved by controlling the rotation of the rotor of the motor body 4, thereby controlling the opening amount of the digital valve, and further controlling the position and speed of the actuator. The specific process is that when the motor screw 3 is a right-handed thread, the rotor of the motor body 4 rotates clockwise (as viewed from the stop end of the motor), which will pull the motor screw 3 and the valve core 2 to move to the left, and the valve port between the first valve core shoulder 22 and the first valve cavity 13 will open, and the valve port between the second valve core shoulder 23 and the second valve cavity 14 will close, such as Figure 2 At this time, the digital valve is in the position of P→A, B→T. The high-pressure oil reaches the first valve cavity 13 through the digital valve oil inlet P and then enters the first working oil port A. The return oil passes through the second working oil port B of the digital valve to the second valve cavity 14 and returns to the right port 15 and then enters the return oil port T. The high-pressure oil flows as shown in the figure below. Figure 2 When the rotor of the motor body 4 rotates counterclockwise (viewed from the motor stop end), the motor screw 3 and the digital valve core 2 will be pushed to the right, the valve port between the second valve core shoulder 23 and the second valve cavity 14 will be opened, and the valve port between the first valve core shoulder 22 and the first valve cavity 13 will be closed. Figure 3As shown, at this time, the digital valve is in the position of P→B, A→T, and the high-pressure oil reaches the second valve cavity 14 through the digital valve oil inlet P and then enters the second working oil port B. The return oil passes through the digital valve first working oil port A to the first valve cavity 13 and returns to the left port 12 and then enters the return oil port T. The high-pressure oil flows as shown in FIG. Figure 3 Indicated by the arrow.

[0027] Similarly, when the motor screw 3 is a left-handed thread, the rotation direction of the motor body 4 rotor is opposite to the valve port action. Specifically, when the motor screw 3 is a left-handed thread, the rotor of the motor body 4 rotates clockwise (from the motor stop end), which will push the motor screw 3 and the digital valve core 2 to move rightward, and the valve port between the second valve core shoulder 23 and the second valve cavity 14 will open, and the valve port between the first valve core shoulder 22 and the first valve cavity 13 will close. Figure 3 As shown, at this time, the digital valve is in the position of P→B, A→T, and the high-pressure oil reaches the second valve cavity 14 through the digital valve oil inlet P and then enters the second working oil port B. The return oil passes through the digital valve first working oil port A to the first valve cavity 13 and returns to the left port 12 and then enters the return oil port T. The rotor of the motor body 4 rotates counterclockwise (observed from the motor stop end), pulling the motor screw 3 and the valve core 2 to move to the left, the first valve core shoulder 22 and the valve port between the first valve cavity 13 are opened, and the second valve core shoulder 23 and the valve port between the second valve cavity 14 are closed, as shown in FIG. Figure 2 At this time, the digital valve is in the position of P→A, B→T, and the high-pressure oil reaches the first valve cavity 13 through the digital valve oil inlet P and then enters the first working oil port A. The return oil passes through the digital valve second working oil port B to the second valve cavity 14 and returns to the right port 15 and then enters the return oil port T.

[0028] In addition, the through-axis linear motor digital valve described in the present invention can be open-loop controlled without feedback links, and the overall structure of the system is simple, stable, low-cost, and reliable. It can also be combined with different feedback forms (electrical feedback, mechanical feedback, etc.) to form a closed-loop control, monitor the working conditions of the digital valve in real time, correct the operation process, and prevent the working system from deviating from the predetermined target.

[0029] Therefore, the present invention adopts the above-mentioned through-axis linear motor digital valve, and controls the rotation of the rotor of the motor body to make the motor screw and the valve core produce axial movement, thereby controlling the valve opening amount of the digital valve, and then controlling the position and speed of the actuator, thereby improving the accuracy of hydraulic control, simplifying the control element structure, and reducing the difficulty of manufacturing the control element.

[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. A through-axis linear motor digital valve, characterized in that: It includes a valve body, a valve core is arranged in the valve body, the valve core is arranged horizontally and passes through the valve body, the valve core moves axially in the valve body, the right end of the valve core is connected to a motor screw, the valve core and the motor screw are arranged coaxially, the motor screw is connected to the motor body, and the motor body is fixedly arranged at the right end of the valve body.

2. A through-axis linear motor digital valve according to claim 1, characterized in that: A transverse valve core cavity is arranged in the middle of the valve body, an oil inlet is arranged at the top of the valve body, a first working oil port is arranged on the left side of the oil inlet, a second working oil port is arranged on the right side of the oil inlet, and an oil return port is arranged at the bottom of the valve body, and the oil inlet, the first working oil port, the second working oil port and the oil return port are all connected to the valve core cavity.

3. A through-axis linear motor digital valve according to claim 2, characterized in that: A first valve cavity is disposed at a position where the bottom end of the first working oil port communicates with the valve core cavity, and a second valve cavity is disposed at a position where the bottom end of the second working oil port communicates with the valve core cavity.

4. A through-axis linear motor digital valve according to claim 3, characterized in that: The valve core is located in the valve core cavity, a left sealing shoulder is provided at the left end of the valve core, a right sealing shoulder is provided at the right end of the valve core, a first valve core shoulder is provided at the middle section of the valve core and the first valve cavity, and a second valve core shoulder is provided at the middle section of the valve core and the second valve cavity.

5. A through-axis linear motor digital valve according to claim 4, characterized in that: The left end of the oil return port is located between the left sealing shoulder and the first valve core shoulder, and the right end of the oil return port is located between the right sealing shoulder and the second valve core shoulder.

6. A through-axis linear motor digital valve according to claim 5, characterized in that: The left port and the right port are communicated with each other inside the valve body.

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