High-speed high-precision electric control valve execution device

Abstract

The utility model belongs to the technical field of aviation servo valves, and discloses a high-speed high-precision electric control valve executing device which comprises an absolute encoder, a servo motor, a position sensor, a transmission mechanism, a four-column guide basket type stabilizing mechanism and an output shaft. The absolute encoder is connected and arranged at the top of the servo motor, the bottom of the servo motor is connected with the transmission mechanism, the transmission mechanism converts rotary motion of the servo motor into linear motion and transmits the linear motion to the four-column guide basket type stabilizing mechanism, and the output shaft is arranged at the bottom of the four-column guide basket type stabilizing mechanism; the four-column guide basket type stabilizing mechanism comprises a four-column anti-rotation movement guide column and a basket arranged at the bottom of the four-column anti-rotation movement guide column; the position sensor is arranged between the servo motor and the transmission mechanism and measures the linear movement position of the transmission mechanism. The utility model has the advantages of high measurement precision, high control precision, fast speed of the output shaft, large dragging force of the output shaft and good safety performance.

Description

Technical Field

[0001] This utility model belongs to the field of aviation servo valve technology, and relates to a linear electric mechanism used in aviation servo valves, specifically a high-speed, high-precision electric regulating valve actuator. Background Technology

[0002] Electric control valves are widely used in industrial control, such as in the aerospace field. Compared with electro-hydraulic and pneumatic control valves, electric control valves do not require additional piping to supply hydraulic oil or compressed air, making installation convenient and quick.

[0003] Currently, the output shaft speed of the electric actuator in mainstream linear electric control valves is approximately 0.5mm / s-2mm / s. Taking a 30mm stroke valve as an example, it takes 20 seconds to complete one stroke, resulting in slow valve opening and closing times that cannot meet the requirements of rapid response in fluid control applications in the aerospace field. Furthermore, the position detection of the electric actuator uses traditional sliding wire resistance rulers, which are then converted into digital signals by a low-bit AD converter and transmitted to the microcontroller. The overall valve position detection error reaches 0.3%-0.5% (relative to full scale). In addition, the electric actuator uses open-loop stepper motors or open-loop variable frequency motors, which have relatively low power. After N-stage reduction to drive the load, stepper motors are prone to step loss, and variable frequency motors may experience low torque control overshoot, resulting in poor control accuracy. Based on the current limitations of electric control valves, a high-speed, high-precision electric control valve actuator is proposed. Utility Model Content

[0004] To address the aforementioned issues, this invention provides a high-speed, high-precision electric regulating valve actuator, characterized by high speed, high precision, high rigidity, and large thrust. This effectively solves the problems of slow valve opening and closing times and complex installation. Furthermore, it simplifies, standardizes, and modularizes the connection between the electric regulating valve's automated control signal interface and the DCS system, thereby saving engineering costs.

[0005] The technical solution of this utility model is as follows:

[0006] A high-speed, high-precision electric regulating valve actuator includes an absolute encoder, a servo motor, a position sensor, a transmission mechanism, a four-column guide basket-type stabilizing mechanism, and an output shaft. The absolute encoder is connected to and mounted on the top of the servo motor, and the transmission mechanism is connected to the bottom of the servo motor. The transmission mechanism converts the rotational motion of the servo motor into linear motion and transmits it to the four-column guide basket-type stabilizing mechanism. The output shaft is located at the bottom of the four-column guide basket-type stabilizing mechanism. The four-column guide basket-type stabilizing mechanism includes four-column anti-rotation guide columns and a basket located at the bottom of the four-column anti-rotation guide columns. The position sensor is located between the servo motor and the transmission mechanism and measures the linear movement position of the transmission mechanism.

[0007] Furthermore, it also includes a planetary reducer, which is located between the servo motor and the transmission mechanism.

[0008] Furthermore, the transmission mechanism includes a shaft connection, a ball screw nut, and a screw. The rotational output at the bottom of the servo motor is connected to the screw via the shaft connection. The screw is equipped with a ball screw nut, forming a screw-nut structure. The ball screw nut is equipped with a radial extension plate, which is fixedly connected to a four-column anti-rotation motion guide post. The radial position of the four-column anti-rotation motion guide post is fixed.

[0009] Furthermore, the transmission mechanism includes a base, the bottom of the lead screw is connected to the base through a lower needle roller bearing, the base is provided with four axial lower limit holes, and four-column anti-rotation motion guide columns are inserted into the lower part of the base through the four lower limit holes respectively, and the basket is located below the base.

[0010] Furthermore, the transmission mechanism also includes a housing and a top plate. The upper part of the lead screw is connected to the top plate through an upper needle roller bearing. The top plate is provided with four axial upper limit holes, and the four-column anti-rotation motion guide columns correspond to the positions of the four upper limit holes respectively. When the four-column anti-rotation motion guide columns rise to the highest position, the top of the four-column anti-rotation motion guide columns protrudes from the four upper limit holes respectively. The housing is located between the top plate and the base.

[0011] The beneficial effects of this utility model are as follows:

[0012] 1. High measurement accuracy: The control valve actuator adopts a 23-bit multi-turn absolute encoder, which greatly improves the valve position measurement accuracy.

[0013] 2. High control precision: The servo motor of the regulating valve actuator has a built-in 10-bit encoder with a pulse equivalent of 360° / 1024 = 0.3515625°, which is higher than that of a traditional stepper motor (step angle 7.5°). The actual displacement control resolution of the valve stem end reaches 0.001% (relative to a valve full scale stroke of 30mm), and the absolute dimensional error of the controlled mechanical displacement is less than 0.005mm.

[0014] 3. High output shaft speed: maximum speed is 200mm / s, average speed is (10-150)mm / s, and the speed is adjustable.

[0015] 4. High output shaft drag force: 4KN~50KN optional.

[0016] 5. Safety: Servo motors have advantages such as closed-loop motor position control mode, overshoot protection, and overload self-protection safety mode. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the direct-drive structure of the motor in the drive system.

[0018] Figure 2 This is a schematic diagram of the high-torque structure of the drive system;

[0019] Figure 3 A schematic diagram of the internal structure of the direct-drive motor structure of the drive system;

[0020] Figure 4 A schematic diagram of the appearance of a remote split-type control scheme for an automated control interface;

[0021] Figure 5 A schematic diagram of the appearance of an integrated field control solution for an automated control interface;

[0022] In the diagram: 1—Absolute encoder, 2—Servo motor, 3—Position sensor, 4—Transmission mechanism, 5—Four-column guide basket-type stabilizing mechanism, 6—Output shaft, 7—Planetary reducer, 8—Shaft connection, 9—Four-column anti-rotation motion guide column, 10—Upper needle roller bearing, 11—Ball screw nut, 12—Self-supplied pulsating oil pump circulating lubrication device, 13—Lower needle roller bearing, 14—Screw. Detailed Implementation

[0023] This section describes embodiments of the present invention, used to explain and illustrate the technical solutions of the present invention. Unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0024] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating directions or positional relationships, are based on the orientation or positional relationships in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or device referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include more than one of those features. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0025] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integrated connection; they can refer to a mechanical connection or a point connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0026] Example 1:

[0027] A high-speed, high-precision electric regulating valve actuator includes an absolute encoder 1, a servo motor 2, a position sensor 3, a transmission mechanism 4, a four-column guide basket-type stabilizing mechanism 5, and an output shaft 6. The absolute encoder 1 is connected to and mounted on the top of the servo motor 2, and the bottom of the servo motor 2 is connected to the transmission mechanism 4. The transmission mechanism 4 converts the rotational motion of the servo motor 2 into linear motion and transmits it to the four-column guide basket-type stabilizing mechanism 5. The output shaft 6 is located at the bottom of the four-column guide basket-type stabilizing mechanism 5. The four-column guide basket-type stabilizing mechanism 5 includes a four-column anti-rotation guide post 9 and a basket located at the bottom of the four-column anti-rotation guide post. The position sensor 3 is located between the servo motor 2 and the transmission mechanism 4 and measures the linear movement position of the transmission mechanism 4.

[0028] It also includes a planetary reducer 7, which is located between the servo motor 2 and the transmission mechanism 4.

[0029] The transmission mechanism 4 includes a shaft connection 8, a ball screw nut 11, and a lead screw 14. The rotation output of the servo motor 2 at the bottom is connected to the lead screw 14 through the shaft connection 8. The lead screw 14 is provided with a ball screw nut 11, forming a lead screw-nut structure. The ball screw nut 11 is provided with a radial extension plate. The radial extension plate of the ball screw nut 11 is fixedly connected to the four-column anti-rotation motion guide post 9. The radial position of the four-column anti-rotation motion guide post 9 is fixed.

[0030] The transmission mechanism 4 includes a base. The bottom of the lead screw 14 is connected to the base through a lower needle roller bearing 13. The base is provided with four axial lower limit holes. The four-column anti-rotation motion guide column 9 is inserted into the lower part of the base through the four lower limit holes. The basket is located below the base.

[0031] The transmission mechanism 4 also includes a housing and a top plate. The upper part of the lead screw 14 is connected to the top plate through an upper needle roller bearing 10. The top plate is provided with four axial upper limit holes. The four-column anti-rotation motion guide column 9 corresponds to the position of the four upper limit holes respectively. When the four-column anti-rotation motion guide column 9 rises to the uppermost position, the top of the four-column anti-rotation motion guide column 9 extends out of the four upper limit holes respectively. The housing is located between the top plate and the base.

[0032] Example 2:

[0033] The drive system of the electric control valve actuator has two structures: one is a direct-drive motor structure, such as... Figure 1 As shown, one type has the characteristic of fast valve opening and closing time; another type is a high-torque structure, such as... Figure 2 As shown, a planetary reducer has been added, which can provide higher torque output. The automation control interface scheme for the electric regulating valve actuator is divided into a remote split control scheme (such as...). Figure 4 (as shown) and integrated field control solutions (such as) Figure 5 (As shown).

[0034] The electric regulating valve actuator drive system consists of an absolute encoder 1, a servo motor 2, a position sensor 3, a transmission mechanism 4, a four-column guide basket-type stabilizing mechanism 5, and an output shaft 6. Its working principle is as follows: the driver compares the input signal and the feedback signal to obtain a difference signal. This difference signal is amplified by the driver and drives the servo motor to rotate (or is reduced in speed by a reducer), causing a change in the output shaft angle. The output shaft angle position is fed back to the driver's input via the position sensor, reducing the difference signal. When the difference signal becomes zero, the servo motor stops rotating, and the output shaft stabilizes at the position corresponding to the input signal.

[0035] During valve opening adjustment, the rotational displacement output by the motor is transmitted to the lead screw 14 via the coupling 8. The lead screw 14 converts the rotational motion into the linear motion of the ball screw nut 11 through threaded transmission, causing the ball screw nut 11 to move up and down on the four-column anti-rotation guide post 9. Under the traction of the ball screw nut 11, the four-column anti-rotation guide post 9 drives the output shaft 6 to move up and down. The output shaft 6 acts on the valve core of the valve body, achieving the purpose of valve opening control. Among them, the basket-type output shaft with built-in disc spring can ensure overload protection when the valve is closed; the double-tapered needle roller bearings 10 and 13 stabilize the lead screw, solving the problem of axial bidirectional load, and is more stable than the traditional electric cylinder structure (single bearing cantilever lead screw structure); the four-column anti-rotation guide post 9 can disperse the torque load, making it less prone to jamming and structurally stable; the self-supplying pulsating oil pump circulating lubrication device 12 can protect the reliable lubrication of the moving mechanism and ensure a long maintenance-free cycle.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should be covered within the protection scope of this utility model.

Claims

1. A high-speed, high-precision electric regulating valve actuator, characterized in that, The system includes an absolute encoder (1), a servo motor (2), a position sensor (3), a transmission mechanism (4), a four-post guide basket-type stabilizing mechanism (5), and an output shaft (6). The absolute encoder (1) is connected to and located on the top of the servo motor (2). The bottom of the servo motor (2) is connected to the transmission mechanism (4). The transmission mechanism (4) converts the rotational motion of the servo motor (2) into linear motion and transmits it to the four-post guide basket-type stabilizing mechanism (5). The output shaft (6) is located at the bottom of the four-post guide basket-type stabilizing mechanism (5). The four-post guide basket-type stabilizing mechanism (5) includes a four-post anti-rotation motion guide post (9) and a basket located at the bottom of the four-post anti-rotation motion guide post. The position sensor (3) is located between the servo motor (2) and the transmission mechanism (4) and measures the linear movement position of the transmission mechanism (4).

2. The high-speed, high-precision electric regulating valve actuator according to claim 1, characterized in that, It also includes a planetary reducer (7), which is located between the servo motor (2) and the transmission mechanism (4).

3. A high-speed, high-precision electric regulating valve actuator according to claim 1 or 2, characterized in that, The transmission mechanism (4) includes a shaft connection (8), a ball screw nut (11) and a screw (14). The rotation output of the bottom of the servo motor (2) is connected to the screw (14) through the shaft connection (8). The screw (14) is provided with a ball screw nut (11) to form a screw-nut structure. The ball screw nut (11) is provided with a radial extension plate. The radial extension plate of the ball screw nut (11) is fixedly connected to the four-column anti-rotation motion guide post (9). The radial position of the four-column anti-rotation motion guide post (9) is fixed.

4. The high-speed, high-precision electric regulating valve actuator according to claim 3, characterized in that, The transmission mechanism (4) includes a base. The bottom of the lead screw (14) is connected to the base through a lower needle roller bearing (13). The base is provided with four axial lower limit holes. The four-column anti-rotation motion guide column (9) is inserted into the lower part of the base through the four lower limit holes. The basket is located below the base.

5. The high-speed, high-precision electric regulating valve actuator according to claim 4, characterized in that, The transmission mechanism (4) also includes a housing and a top plate. The upper part of the lead screw (14) is connected to the top plate through an upper needle roller bearing (10). The top plate is provided with four axial upper limit holes. The four-column anti-rotation motion guide column (9) corresponds to the position of the four upper limit holes respectively. When the four-column anti-rotation motion guide column (9) rises to the uppermost position, the top of the four-column anti-rotation motion guide column (9) extends out of the four upper limit holes respectively. The housing is located between the top plate and the base.

6. The high-speed, high-precision electric regulating valve actuator according to claim 1, characterized in that, Four-post guide basket-type stabilizing mechanism (5) with built-in disc spring.

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