High-precision anti-seismic explosion-proof electric actuating mechanism

Abstract

The utility model discloses a high-precision anti-seismic explosion-proof electric actuating mechanism which comprises a reduction gearbox body, and a motor control transmission mechanism is installed in the reduction gearbox body. The mounting flange is mounted at the output end of the motor control transmission mechanism, the valve is mounted on the mounting flange, and the opening and closing of the valve are controlled through the motor control transmission mechanism; wherein the control module is composed of a control panel and a module box, the control panel is installed in the module box, and the electric appliance part controls the motor control transmission mechanism; and the hand wheel transmission mechanism is mounted on the reduction gearbox body and is in meshing transmission with the motor control transmission mechanism, and when the motor or the electric control system breaks down, the valve is controlled to be opened and closed in a manual operation mode. Through reasonable internal layout, the electric control transmission mechanism can still operate stably under the influence of severe environments such as external vibration, high temperature and the like, and the anti-vibration performance and the durability of the electric control transmission mechanism are remarkably improved.

Description

Technical Field

[0001] The utility model relates to an actuator, in particular to a high-precision earthquake-resistant explosion-proof electric actuator. Background Art

[0002] Electric actuators are widely used in industrial automation, nuclear power conditions, petrochemical and other fields. Their main function is to drive the actuator to complete the opening and closing operations of valves through an electric control system. However, existing electric actuators have certain deficiencies in seismic resistance and control accuracy, and it is difficult to meet the working condition requirements of high precision and high reliability. For the in-island ventilation system of nuclear power plants, imported electric actuators are mostly used at present. In the prior art, electric actuators usually adopt the following two control schemes:

[0003] Integrated circuit control:

[0004] An actuator using an integrated circuit can achieve relatively high control accuracy and is suitable for application scenarios that require fine adjustment and high-precision control.

[0005] However, the seismic performance of integrated circuits is poor. In a frequently vibrating or high-temperature environment, the circuit board is easily damaged, resulting in equipment failures and increased maintenance costs.

[0006] Contactor or relay control:

[0007] An electric actuator using a contactor or relay control has certain seismic performance and is suitable for relatively harsh working conditions.

[0008] However, since contactors and relays cannot form a closed-loop control circuit, their control accuracy is poor and it is difficult to meet the requirements of high-precision adjustment. Once the circuit part is damaged, it is very difficult to control the valve opening and closing electrically. At this time, the operation is inconvenient, and the current structure design of the electric control valve opening and closing method is unreasonable, the internal structure is complex, and problems are more likely to occur, requiring frequent maintenance. Summary of the Invention

[0009] In order to solve the above problems, the utility model provides a high-precision earthquake-resistant explosion-proof electric actuator, which can effectively solve the deficiencies in the prior art.

[0010] The utility model is realized by the following technical solutions: a high-precision earthquake-resistant explosion-proof electric actuator, comprising:

[0011] A reduction gearbox housing, in which a motor control transmission mechanism is installed;

[0012] An installation flange, installed at the output end of the motor control transmission mechanism, and a valve is installed on the installation flange, and the opening and closing of the valve is controlled by the motor control transmission mechanism;

[0013] The electrical part includes a control module, a junction board and a touch panel. Among them, the control module consists of a control board and a module box. The control board is installed inside the module box, and the motor control transmission mechanism is controlled through the electrical part.

[0014] The handwheel transmission mechanism is installed on the reduction gearbox body and meshes with the motor control transmission mechanism to control the opening and closing of the valve manually when the motor or the electric control system fails.

[0015] As a preferred technical solution, an electrical box cover is installed on the reduction gearbox body, and the handwheel transmission mechanism is installed on the electrical box cover.

[0016] As a preferred technical solution, the touch panel is installed on the reduction gearbox body, a junction box cover is installed on the vertical plane of the reduction gearbox body opposite to the touch panel, and the junction board is installed inside the junction box cover.

[0017] As a preferred technical solution, the motor control transmission mechanism includes a DC brushless motor, a reduction gearbox, a coupling, a lead screw, a transmission nut, a piston tube and a support column. The reduction gearbox is installed at the output end of the DC brushless motor. The output end of the reduction gearbox is connected to the lead screw through a coupling. The transmission nut is installed on the lead screw, and a drive shaft sleeve is installed at the outer end of the transmission nut.

[0018] The piston tube is fixedly installed at the output end of the reduction gearbox body. The lead screw, the transmission nut and the drive shaft sleeve are all installed inside the piston tube. A part of the drive shaft sleeve extends out of the piston tube, and sliding shaft sleeves are respectively arranged on both sides of the extended end of the drive shaft sleeve.

[0019] It further includes two support columns. One ends of the two support columns are respectively fixedly installed on the reduction gearbox body, the mounting flange is installed at the other ends of the two support columns, and the sliding shaft sleeves are slidably installed on the two support columns.

[0020] As a preferred technical solution, double row angular contact bearings are installed outside the lead screw.

[0021] As a preferred technical solution, an anti-wear sleeve is installed outside the coupling.

[0022] As a preferred technical solution, the handwheel transmission mechanism includes a rotating handwheel. A manual large gear is installed at one end of the rotating handwheel located inside the reduction gearbox body, and the manual large gear meshes with the transmission gear on the output shaft of one side of the DC brushless motor.

[0023] The beneficial effects of the present utility model are as follows: Through a reasonable internal layout, the electric control transmission mechanism of the present utility model can still operate stably under the influence of harsh environments such as external vibrations and high temperatures, significantly improving its seismic resistance and durability. At the same time, an emergency control method with manual control is set. When the electric control transmission mechanism fails, it can quickly switch to manual operation to ensure the normal opening and closing of the valve, enhancing the reliability and service life of the equipment, and greatly improving the operation safety and flexibility of the equipment under critical working conditions.

[0024] Regarding the machine precision, the improvement of precision is achieved from two aspects: mechanical precision and electrical control precision. Mechanically, since there is only a two-stage gear transmission in the whole machine, and the two-stage gear transmission is itself integrated in a reduction box and serves as a component as part of the machine, the precision of the whole machine is controllable and adjustable, and the mechanical clearance of the whole machine can be measured in microns.

[0025] For the electrical part, integrated circuit control technology is adopted. The motor uses a DC brushless motor with a built-in position sensor. The real-time position of the motor is transmitted to the CPU of the integrated circuit, and after being processed by the CPU into various signals, it controls the mechanical movement of the whole machine, greatly improving the control precision compared with using contactors.

[0026] Due to the fact that the mechanical part of the whole machine adopts a component-based assembly concept, the mechanical seismic resistance of the whole machine can easily meet the nuclear power K3 level. For the electrical part, a micro-power consumption design concept is adopted. Therefore, the circuit device of the whole machine can be integrated in a control box, and the control box is sealed with epoxy resin. Thus, the electrical part can also easily meet the seismic requirements of nuclear power K3. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0028] Figure 1 Schematic diagram of the overall structure of the present utility model Figure 1 ;

[0029] Figure 2 Schematic diagram of the overall structure of the present utility model Figure 2 ;

[0030] Figure 3 Internal cross-sectional view of the present utility model;

[0031] 1. Electric appliance box cover; 2. Rotating handwheel; 3. Junction box cover; 4. Reducing gearbox body; 5. Driving shaft sleeve; 6. Touch panel; 7. Piston tube; 8. Support pillar; 9. Sliding shaft sleeve; 10. Mounting flange; 11. Manual large gear; 12. DC brushless motor; 13. Reducing gearbox; 14. Transmission gear; 15. Wear-resistant sleeve; 16. Coupling; 17. Double-row angular contact bearing; 18. Lead screw; 19. Transmission nut. Detailed implementation mode

[0032] All features disclosed in this specification, or all steps in the disclosed methods or processes, except for mutually exclusive features and / or steps, can be combined in any way.

[0033] Any feature disclosed in this specification (including any additional claims, abstract, and drawings), unless specifically stated, can be replaced by other equivalent or similar-purpose alternative features. That is, unless specifically stated, each feature is only an example of a series of equivalent or similar features.

[0034] As Figures 1 - 3 shown, a high-precision earthquake-resistant and explosion-proof electric actuator of the present utility model includes a reducing gearbox body 4, and a motor control transmission mechanism is installed inside the reducing gearbox body 4;

[0035] It further includes a mounting flange 10, which is installed at the output end of the motor control transmission mechanism, and a valve is installed on the mounting flange 10, and the opening and closing of the valve are controlled by the motor control transmission mechanism;

[0036] It further includes an electrical part, including a control module, a wiring board, and a touch panel 6. Among them, the control module is composed of a control board and a module box. The control board is installed inside the module box, and the motor control transmission mechanism is controlled by the electrical part;

[0037] It further includes a handwheel transmission mechanism, which is installed on the reducing gearbox body 4 and meshes with the motor control transmission mechanism to drive. When the motor or the electric control system fails, the opening and closing of the valve are controlled by manual operation.

[0038] An electric appliance box cover 1 is installed on the reducing gearbox body 4, the handwheel transmission mechanism is installed on the electric appliance box cover 1, the touch panel 6 is installed on the reducing gearbox body 4, a junction box cover 3 is installed on the vertical plane of the reducing gearbox body 4 opposite to the touch panel 6, the wiring board is installed inside the junction box cover 3, and the touch panel 6 can perform some touch controls, display data, and be capable of touch button control. It is the control end of the present utility model for manual operation.

[0039] Among them, as Figure 3As shown in the figure, the motor control transmission mechanism includes a DC brushless motor 12, a reduction gearbox 13, a coupling 16, a lead screw 18, a transmission nut 19, a piston tube 7, and a support column 8. The reduction gearbox 13 is installed at the output end of the DC brushless motor 12. The output end of the reduction gearbox 13 is connected to the lead screw 18 through the coupling 16. The transmission nut 19 is installed on the lead screw 18. A drive shaft sleeve 5 is installed at the outer end of the transmission nut 19. A position sensor is installed at the DC brushless motor. The real-time position of the motor is transmitted to the CPU of the integrated circuit and processed into various signals by the CPU to control the mechanical movement of the whole machine, greatly improving the control accuracy of using a contactor.

[0040] The piston tube 7 is fixedly installed at the output end of the reduction gearbox body 4. The lead screw 18, the transmission nut 19, and the drive shaft sleeve 5 are all installed inside the piston tube 7. A part of the drive shaft sleeve 5 extends out of the piston tube 7. A sliding shaft sleeve 9 is respectively arranged on both sides of the extending end of the drive shaft sleeve 5.

[0041] There are also two support columns 8. One ends of the two support columns 8 are respectively fixedly installed on the reduction gearbox body 4. The mounting flange 10 is installed at the other ends of the two support columns 8. The sliding shaft sleeve 9 is slidably installed on the two support columns 8. The sliding shaft sleeve 9 can reciprocate along the length direction of the support column 8. In this way, the lead screw 18 can be used to drive the drive shaft sleeve 5 to operate the opening and closing end of the valve, achieving the purpose of electrically controlling the opening and closing of the valve.

[0042] In order to increase the stability of the lead screw 18 transmission, improve the transmission accuracy, and reduce the shaking, in this embodiment, a double-row angular contact bearing 17 is installed outside the lead screw 18.

[0043] Among them, an anti-wear sleeve 15 is installed outside the coupling 16. The friction between the coupling 16 and the outside during rotation is reduced through the anti-wear sleeve 15, increasing the service life of the coupling 16.

[0044] As Figure 3 shown in the figure, the handwheel transmission mechanism includes a rotating handwheel 2. A manual large gear 11 is installed at one end of the rotating handwheel 2 inside the reduction gearbox body 4. The manual large gear 11 meshes with a transmission gear 14 on the output shaft on one side of the DC brushless motor 12. An operator rotates the rotating handwheel 2. The rotation of the rotating handwheel 2 drives the rotation of the manual large gear 11. The rotation of the manual large gear 11 drives the rotation of the transmission gear 14, and then drives the rotation of the motor shaft of the DC brushless motor 12, achieving the purpose of manually controlling the rotation of the lead screw 18.

[0045] Electric control process:

[0046] The operator inputs control instructions through the touch panel 6. The touch panel 6 displays the current system status and relevant data and operates through touch buttons.

[0047] The control module receives the input signal from the touch panel 6 and transmits the signal to the DC brushless motor 12 through the terminal block.

[0048] After receiving the control signal, the DC brushless motor 12 starts to operate, and the rotational motion of the motor is transmitted to the reduction gearbox 13 through its output shaft.

[0049] The reduction gearbox 13 decelerates the rotational motion of the motor and transmits the decelerated rotational motion to the lead screw 18 through the coupling 16.

[0050] The lead screw 18 rotates driven by the reduction gearbox 13, driving the transmission nut 19 mounted on it to move axially along the lead screw 18.

[0051] The movement of the transmission nut 19 is transmitted through the drive shaft sleeve 5 mounted on its outer end, and the drive shaft sleeve 5 partially extends outside the piston tube 7.

[0052] The extended end of the drive shaft sleeve 5 is provided with a sliding shaft sleeve 9, which is mounted on two struts 8 and reciprocates along the length direction of the struts 8.

[0053] As the sliding shaft sleeve 9 moves, the valve on the mounting flange 10 is driven through the drive shaft sleeve 5 to achieve the opening and closing action.

[0054] Manual control process:

[0055] When a failure occurs in the motor or the electric control system, the operator can perform emergency operations through the manual control method.

[0056] The operator manually rotates the handwheel 2, and the rotation of the handwheel is transmitted through the meshing manual large gear 11.

[0057] The manual large gear 11 meshes with the transmission gear 14 on the output shaft of the DC brushless motor 12, and the rotational motion of the handwheel is transmitted to the motor shaft through the transmission gear 14.

[0058] The rotation of the motor shaft is also transmitted to the lead screw 18 through the reduction gearbox 13 and the coupling 16, driving the lead screw 18 to rotate.

[0059] The rotation of the lead screw 18 drives the transmission nut 19 to move axially along the lead screw 18, and then through the drive shaft sleeve 5 and the sliding shaft sleeve 9 for transmission to control the opening and closing operation of the valve.

[0060] Manual control provides a reliable emergency operation method to ensure that the opening and closing action of the valve can still be manually completed in case of a failure in the electric control system, guaranteeing the safe and stable operation of the system.

[0061] The above are only specific embodiments of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be thought of without creative efforts should be covered within the protection scope of the present utility model. Therefore, the protection scope of the present utility model should be subject to the protection scope defined by the claims.

Claims

1. A high-precision, shock-resistant and explosion-proof electric actuator, characterized in that: include: A reduction box (4), wherein a motor control transmission mechanism is installed in the reduction box (4); A mounting flange (10) is mounted on the output end of the motor-controlled transmission mechanism, a valve is mounted on the mounting flange (10), and the opening and closing of the valve is controlled by the motor-controlled transmission mechanism; The electrical part comprises a control module, a wiring board and a touch panel (6), wherein the control module is composed of a control board and a module box, the control board is installed in the module box, and the motor control transmission mechanism is controlled by the electrical part; A hand wheel transmission mechanism is mounted on the reduction box (4) and meshes with the motor control transmission mechanism for transmission. When the motor or the electric control system fails, the opening and closing of the valve is controlled by manual operation. The motor control transmission mechanism comprises a brushless DC motor (12), a reduction box (13), a coupling (16), a screw (18), a transmission nut (19), a piston tube (7) and a support (8), wherein the reduction box (13) is mounted on the output end of the brushless DC motor (12), the output end of the reduction box (13) is connected to the screw (18) via the coupling (16), the transmission nut (19) is mounted on the screw (18), and the outer end of the transmission nut (19) is mounted with a drive sleeve (5); The piston tube (7) is fixedly mounted on the output end of the reduction box (4); the screw rod (18), the transmission nut (19) and the drive sleeve (5) are all mounted in the piston tube (7); a portion of the drive sleeve (5) extends out of the piston tube (7); and a sliding sleeve (9) is respectively arranged on both sides of the extended end of the drive sleeve (5); It also includes two pillars (8), one end of each of the two pillars (8) is fixedly mounted on the reduction box body (4), the mounting flange (10) is mounted on the other end of the two pillars (8), and the sliding sleeve (9) is slidably mounted on the two pillars (8).

2. The high-precision shock-proof and explosion-proof electric actuator according to claim 1 is characterized in that: An electrical box cover (1) is installed on the reduction box body (4), and the hand wheel transmission mechanism is installed on the electrical box cover (1).

3. The high-precision shock-proof and explosion-proof electric actuator according to claim 1 is characterized in that: The touch panel (6) is mounted on the reduction box body (4); a junction box cover (3) is mounted on a vertical surface of the reduction box body (4) relative to the touch panel (6); and a junction board is mounted inside the junction box cover (3).

4. The high-precision shock-proof and explosion-proof electric actuator according to claim 1 is characterized in that: A double-row angular contact bearing (17) is installed outside the screw rod (18).

5. The high-precision shock-proof and explosion-proof electric actuator according to claim 1 is characterized in that: An anti-wear sleeve (15) is installed outside the coupling (16).

6. The high-precision shock-proof and explosion-proof electric actuator according to claim 1 is characterized in that: The hand wheel transmission mechanism comprises a rotating hand wheel (2), wherein the rotating hand wheel (2) is located inside the reduction box (4) and has a manual gear wheel (11) installed at one end thereof, and the manual gear wheel (11) is meshed with a transmission gear (14) on an output shaft at one side of a brushless DC motor (12).

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