CN210531731U - Electric actuator - Google Patents
Electric actuator Download PDFInfo
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- CN210531731U CN210531731U CN201921549799.4U CN201921549799U CN210531731U CN 210531731 U CN210531731 U CN 210531731U CN 201921549799 U CN201921549799 U CN 201921549799U CN 210531731 U CN210531731 U CN 210531731U
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- gear
- power supply
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- screw
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Abstract
The utility model discloses an electric actuator, which comprises a frame, a motor, a speed reducer and a control device, wherein the motor adopts a servo motor; the linear travel valve is characterized in that the speed reducer adopts a gear screw device, the gear screw device comprises a driving gear, a driven gear and a screw, the rotation torque of the motor is converted into the travel torque of the screw through the speed reducer, the opening and closing or the adjustment control of the linear travel valve is directly pushed, the valve structure is simplified, and the adjustment precision is improved. The straight-stroke valve actuator is suitable for valve rods such as stop valves and the like to move up and down.
Description
Technical Field
The utility model relates to an electric actuator especially relates to a valve actuator. The utility model is suitable for a straight stroke valve actuator of valve rod elevating movement such as stop valve.
Background
The electric valve actuator generally comprises a motor and a speed reducer, wherein the rotating speed of the motor is reduced by the speed reducer to output torque, and an output shaft of the speed reducer transmits the output torque to a valve rod. The output torque of the reducer of the existing electric actuator is generally a rotating torque, and when the reducer is used for opening adjustment or opening and closing control of straight-stroke valves such as stop valves, gate valves and the like, the rotating torque of the output shaft of the reducer needs to be converted into lifting torque of a valve rod of the valve by the valve, so that the complexity of the valve structure is increased, and the adjustment precision of the electric actuator on the valve is reduced.
Disclosure of Invention
The utility model discloses to the shortcoming that prior art exists, provide an electric actuator that simple structure, regulation precision are high.
The technical scheme of the utility model comprises a frame, a motor, a speed reducer and a control device, wherein the motor adopts a servo motor; the speed reducer is characterized in that a gear screw device is adopted, the gear screw device comprises a driving gear, a driven gear and a screw, the driving gear is fixedly arranged on a motor shaft, the driven gear comprises a first gear and a second gear, the first gear is arranged on a lower mounting plate and an upper mounting plate on a rack through a rotating shaft, the gear of the first gear is meshed with the driving gear, a third gear is arranged on the rotating shaft, the second gear is arranged on the lower mounting plate through a bearing, and the gear of the second gear is meshed with the third gear; the bearing adopts a cylindrical bearing, the outer ring of the cylindrical bearing is fixedly arranged on the lower mounting plate, the upper end face of the inner ring is fixedly connected with the lower end face of the second gear, the second gear is provided with a central hole, the central hole is provided with an internal thread, the thread at the upper end of the screw rod is matched with the internal thread of the central hole of the second gear, and the middle part of the screw rod is matched with a guide hole in a guide plate on the rack.
In the technical scheme, the lower end of the screw rod is connected with the valve rod through the connecting nut, the lower end of the rack is fixedly installed on the heat dissipation support, and the stroke indicator is arranged between the connecting nut and the heat dissipation support.
In the above technical solution, the control device has an automatic power-off reset device, which comprises a controller, an alternating current power circuit, a direct current power circuit, the alternating current power failure detection circuit comprises an alternating current power failure detection circuit, a charging management circuit and an inverter circuit, wherein the voltage output end of the alternating current power supply circuit is respectively connected with a motor working power supply and an alternating current power failure detection circuit working power supply, the output signal end of the alternating current power failure detection circuit is connected with the working power supply end of a controller, one output signal end of the controller is connected with the input signal control end of the charging management circuit, the other output signal end of the controller is connected with the input signal control end of the inverter circuit, the output signal end of the charging management circuit is connected with the charging control end of the direct current power supply circuit, the output voltage of the direct current power supply circuit is connected with the input end of the inverter circuit and the working power supply of the alternating current power.
The beneficial effects of the utility model are that the rotary torque of motor turns into the stroke moment of screw rod through the speed reducer, directly promotes opening and close or the regulation control of straight stroke valve, has simplified the valve structure, improves the regulation precision.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic block diagram of the control device of fig. 1 according to the present invention.
Detailed Description
The electric actuator shown in fig. 1 comprises a frame 1, a motor 10, a speed reducer and a control device 9, wherein the motor 10 adopts a servo motor; the speed reducer is characterized in that a gear screw device is adopted, the gear screw device comprises a driving gear, a driven gear and a screw 3, the driving gear is fixedly arranged on a motor shaft, the driven gear comprises a first gear 8 and a second gear 7, the first gear is arranged between a lower mounting plate 4 and an upper mounting plate 11 on a rack 1 through a rotating shaft 6, the gear of the first gear is meshed with the driving gear, the rotating shaft 6 is provided with a third gear, the second gear 7 is arranged on the lower mounting plate 4 through a bearing 5, and the gear of the second gear is meshed with the third gear; the bearing 5 adopts a cylindrical bearing, the outer ring of the cylindrical bearing is fixedly arranged on the lower mounting plate 4, the upper end face of the inner ring is fixedly connected with the lower end face of the second gear 7, the second gear 7 is provided with a central hole, an internal thread is manufactured in the central hole, a thread is manufactured at the upper end of the screw rod 3 and is matched with the internal thread of the central hole of the second gear 7, the middle part of the screw rod 3 is matched with a guide hole in the guide plate 2 on the frame 1, and the second gear 7 rotates to drive the screw rod 3 to move.
The lower end of the screw rod 3 is connected with the valve rod through a connecting nut, the lower end of the rack 1 is fixedly arranged on the heat dissipation support 12, and a stroke indicator is arranged between the connecting nut and the heat dissipation support 12.
The control device 9 is provided with an automatic power-off reset device, which consists of a controller, an alternating current power supply circuit, a direct current power supply circuit, an alternating current power-off detection circuit, a charging management circuit and an inverter circuit, wherein the voltage output end of the alternating current power supply circuit is respectively connected with a motor working power supply and an alternating current power-off detection circuit working power supply, the output signal end of the alternating current power-off detection circuit is connected with the working power supply end of the controller, one output signal end of the controller is connected with the input signal control end of the charging management circuit, the other output signal end of the controller is connected with the input signal control end of the inverter circuit, the output signal end of the charging management circuit is connected with the charging control end of the direct current power supply circuit, the output voltage of the direct current power supply circuit is connected with the input end of the inverter circuit and the working power supply of the alternating, as shown in fig. 2. The controller detects the electric quantity of the direct current power supply in real time, the alternating current power supply supplies power, when the electric quantity of the direct current power supply is insufficient, the charging management circuit is started to charge the direct current power supply, the charging circuit is closed after the direct current power supply is fully charged, when the alternating current power supply is powered off and the direct current power supply supplies power, the inverter circuit is started to invert the direct current power supply into the alternating current power supply, and the motor 10 is controlled to reset according to the setting of the reset direction. The dc power supply is an internal dc battery DC3.7V; the alternating current power source is an external power source AC 24V. When the alternating current power failure detection circuit realizes alternating current power supply on the hardware circuit, the PCB main board adopts an external alternating current power supply for power supply; when the alternating current power supply is powered off, the internal direct current power supply is switched to supply power to the controller, and a switching signal is output to the controller.
Claims (3)
1. An electric actuator comprises a frame (1), a motor (10), a speed reducer and a control device (9), wherein the motor (10) adopts a servo motor; the speed reducer is characterized in that a gear screw device is adopted, the gear screw device comprises a driving gear, a driven gear and a screw (3), the driving gear is fixedly installed on a motor shaft, the driven gear comprises a first gear (8) and a second gear (7), the first gear (8) is installed between a lower installation plate (4) and an upper installation plate (11) on a rack (1) through a rotating shaft (6), the gears of the first gear are meshed with the driving gear, the rotating shaft (6) is provided with a third gear, the second gear (7) is installed on the lower installation plate (4) through a bearing (5), and the gears of the second gear are meshed with the third gear; the bearing (5) adopts a cylindrical bearing, the outer ring of the cylindrical bearing is fixedly arranged on the lower mounting plate (4), the upper end face of the inner ring is fixedly connected with the lower end face of the second gear (7), the second gear (7) is provided with a central hole, an internal thread is arranged in the central hole, a thread is arranged at the upper end of the screw rod (3) and is matched with the internal thread in the central hole of the second gear (7), and the middle part of the screw rod (3) and a guide hole in the guide plate (2) on the rack (1) are matched with each other.
2. The electric actuator according to claim 1, wherein the lower end of the screw (3) is connected with the valve stem by a connecting nut, the lower end of the frame (1) is fixedly mounted on the heat dissipating support (12), and a stroke indicator is arranged between the connecting nut and the heat dissipating support (12).
3. The electric actuator according to claim 1 or 2, wherein the control device (9) has an automatic power-off reset device, the automatic power-off reset device is composed of a controller, an AC power supply circuit, a DC power supply circuit, an AC power-off detection circuit, a charge management circuit, and an inverter circuit, the voltage output terminal of the AC power supply circuit is connected to the motor working power supply and the AC power-off detection circuit working power supply, respectively, the output signal terminal of the AC power-off detection circuit is connected to the controller working power supply terminal, one output signal terminal of the controller is connected to the input signal control terminal of the charge management circuit, the other output signal terminal is connected to the input signal control terminal of the inverter circuit, the output signal terminal of the charge management circuit is connected to the charge control terminal of the DC power supply circuit, the output voltage of the DC power supply circuit is connected to the input terminal of the inverter circuit and the AC power-off, the output end of the inverter circuit is connected with a working power supply of the motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921549799.4U CN210531731U (en) | 2019-09-18 | 2019-09-18 | Electric actuator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921549799.4U CN210531731U (en) | 2019-09-18 | 2019-09-18 | Electric actuator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210531731U true CN210531731U (en) | 2020-05-15 |
Family
ID=70605765
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921549799.4U Active CN210531731U (en) | 2019-09-18 | 2019-09-18 | Electric actuator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210531731U (en) |
-
2019
- 2019-09-18 CN CN201921549799.4U patent/CN210531731U/en active Active
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