CN217003304U - Electric actuator - Google Patents
Electric actuator Download PDFInfo
- Publication number
- CN217003304U CN217003304U CN202121977684.2U CN202121977684U CN217003304U CN 217003304 U CN217003304 U CN 217003304U CN 202121977684 U CN202121977684 U CN 202121977684U CN 217003304 U CN217003304 U CN 217003304U
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- gear
- gapless
- fixed
- potentiometer
- output shaft
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Abstract
The utility model relates to an electric actuator; comprises a reversible motor, a power transmission gear, a gapless gear and a potentiometer gear. There is no gear clearance between the gapless gear and the potentiometer chi theory, providing a high precision electric actuator.
Description
Technical Field
The utility model relates to the technical field of system control and automation instruments and meters. In particular to the technical field of electric actuating mechanisms.
Background
The electric actuator opens or closes a valve arranged on the pipeline, and controls the flow and the pressure of fluid in the pipeline through opening and closing the valve. In order to control the fluid flow and the pressure, the opening degree of the valve needs to be accurately controlled, and the opening degree of the valve is judged by the resistance value of a potentiometer inside the electric actuator.
The output shaft of the general electric actuator is fixed with a driving gear which drives a potentiometer gear fixed on the output shaft of the potentiometer to rotate.
However, the existing electric actuator has the following disadvantages; disadvantage 1: a gear clearance exists between the driving gear and the potentiometer gear, and the gear clearance generates a valve opening error when the electric actuating mechanism rotates forwards or backwards; and (2) disadvantage: in order to reduce the gear clearance and reduce the central distance between the driving gear and the potentiometer gear, the gears are meshed too tightly, the gears cannot rotate smoothly, even the gears are blocked, and meanwhile, the potentiometer shaft is subjected to radial thrust to shorten the service life; disadvantage 3: the plastic gear can reduce the center distance of the gear, and the gear gap can be shortened, but the plastic gear has poor high temperature resistance and wear resistance and short service life.
SUMMERY OF THE UTILITY MODEL
The present invention has been made to solve the above problems, and an object of the present invention is to provide a high-precision electric actuator provided with a backlash free gear.
To achieve the above object, the present invention comprises: an upper shell 2-1, a lower shell 2-2, a reversible motor 3 arranged on the upper shell and the lower shell, a reduction box 4 connected with the reversible motor 3, a motor gear 5 arranged on an output shaft of the reduction box 4, a big intermediate gear 5-1 meshed with the motor gear 5, a small intermediate gear 6-1, a main gear 6 meshed with the small intermediate gear 6-1, wherein the main gear 6 is fixed on an output shaft 7, an output shaft fixing plate 9, a cam shaft 8, a gapless gear 10 and a cam 17 fixed on the cam shaft 8, a potentiometer gear 11, a limit switch 18 and a control panel 16 arranged on an output shaft of a potentiometer 12; wherein the content of the first and second substances,
when the output shaft reaches the valve full-open or full-close position, the cam 17 presses the limit switch 18 to cut off the power supply to the reversible motor 3 in the direction, and the reversible motor 3 stops operating.
The utility model comprises the following steps; a fixed gapless gear 12-2, a movable gapless gear 12-1, a wire spring 12-3, a snap ring 12-5, an inner hexagonal fixed screw 12-4, wherein,
the fixed gapless gear 12-2 is fixed on the cam shaft 8 through the inner hexagonal fixing screw 12-4, and the movable gapless gear 12-1 is installed on the fixed gapless gear 12-2 and can rotate for a certain angle.
The utility model comprises the following steps; one end of the wire spring 12-3 of the gapless gear 10 is inserted into the fixed gapless gear 12-2, and the other end of the wire spring 12-3 is inserted into the movable gapless gear 12-1.
The utility model comprises the following steps; when the gapless gear 10 is engaged with the potentiometer gear 11, the fixed gapless gear 12-2 and the movable gapless gear 12-1 are formed by staggering the wire spring 12-3 by more than one tooth from a natural state, the teeth of the fixed gapless gear 12-2 and the movable gapless gear 12-1 clamp the teeth of the potentiometer gear 11 under the action of the spring restoring force of the wire spring 12-3, and the tooth surfaces of the gapless gear 10 and the potentiometer gear 11 are always attached to rotate when the gapless gear 10 and the potentiometer gear 11 rotate.
According to the present invention, the following effects can be achieved.
That is, the gapless gear does not have a gear gap, and a high-precision electric actuator is provided.
Drawings
FIG. 1 is a schematic view of an electric actuator according to the present invention
FIG. 2 is a schematic view of a gapless gear structure
FIG. 3 is an exploded view of a gapless gear
FIG. 4 shows a fixed gapless gear
FIG. 5 shows a movable gapless gear
FIG. 6 is a wire spring
Detailed Description
Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings.
Fig. 1 is a schematic view showing a structure of an electric actuator according to the present invention. Fig. 2 is a schematic view of a gapless gear structure. Fig. 3 is an exploded view of a gapless gear. Fig. 4 shows a fixed gapless gear. Figure 5 is a movable gapless gear. Fig. 6 is a wire spring.
In fig. 1, the present electric actuator comprises; the device comprises an upper shell 2-1, a lower shell 2-2, a reversible motor 3 arranged on the upper shell and the lower shell, and a reduction box 4 connected with the reversible motor 3, wherein a motor gear 5 is arranged on an output shaft of the reduction box 4, a large intermediate gear 5-1 and a small intermediate gear 6-1 which are meshed with the motor gear 5, a main gear 6 meshed with the small intermediate gear 6-1 is fixed on an output shaft 7, an output shaft fixing plate 9 and a cam shaft 8, a gapless gear 10 and a cam 17 are fixed on the cam shaft 8, a potentiometer gear 11, a limit switch 18 and a control panel 16 are arranged on an output shaft of a potentiometer 12.
In fig. 2, the fixed gapless gear 12-2 is fixed to the camshaft 8 with a hexagon socket set screw 12-4. The fixed gapless gear 12-2 rotates simultaneously with the camshaft 8. The movable gapless gear 12-1 is installed on the fixed gapless gear 12-2, one end of the wire spring 12-3 is inserted into the fixed gapless gear 12-2, the other end is inserted into the movable gapless gear 12-1, and the movable gapless gear 12-1 can rotate a certain angle on the fixed gapless gear 12-2. After the movable gapless gear 12-1 rotates a certain angle, the gear is released, and the movable gapless gear 12-1 rotates back to the initial position by the restoring force of the wire spring 12-3. The snap ring 12-5 is arranged on the fixed gapless gear 12-2 to prevent the movable gapless gear 12-1 from falling off.
In fig. 3, the fixed gapless gear 12-2, the movable gapless gear 12-1 and the camshaft 8 rotate together.
In fig. 4, the end face of the fixed gapless gear 12-2 is provided with a hole for inserting the linear spring 12-3, and a bolt hole for fixing the hexagon socket head cap fixing screw 12-4 is also arranged.
In fig. 5, the section of the movable gapless gear 12-1 is provided with a hole for inserting the wire spring 12-3.
In fig. 6, the two ends of the wire spring 12-3 are bent, one end is inserted into the fixed gapless gear 12-2, and the other end is inserted into the movable gapless gear 12-1.
The electric actuator of the present invention will be described in detail below.
In fig. 1, the reversible motor 3 rotates in the forward and reverse directions, the main gear 6 also rotates in the forward and reverse directions, the camshaft 8 is fixed to the output shaft 7, and the camshaft 8 and the output shaft 7 rotate simultaneously as one body. The gapless gear 10 is fixed on the cam shaft 8, and the gapless gear 10 rotates simultaneously when the cam shaft 8 rotates. The gapless gear 10 rotates, the potentiometer gear 11 rotates reversely, and the potentiometer gear 11 is installed on an output shaft of the potentiometer 12. The output shaft of the potentiometer 12 rotates and the internal resistance of the potentiometer changes, which reflects the relative position of the output shaft.
The gapless gear of the present invention will be described in detail below.
In fig. 2, the fixed slackless gear 12-2 is fixed to the cam shaft 8 by a hexagonal socket head cap 12-4, the wire spring 12-3 is in a natural state, and the initial position of the movable slackless gear 12-1 is determined by the natural state of the wire spring 12-3. When the gapless gear 10 is meshed with the potentiometer gear 11, the movable gapless gear 12-1 is rotated in one direction to enable the teeth of the movable gapless gear and the adjacent teeth of the fixed gapless gear 12-2 to be staggered by more than 1 tooth relatively, and then the gapless gear 10 is matched with the potentiometer gear 11. The movable gapless gear 12-1 is returned to the initial position by the restoring force of the wire spring 12-3, and one tooth of the fixed gapless gear 12-2 and one tooth of the movable gapless gear 12-1 sandwich the tooth of the potentiometer gear 11. As a result, there is no gear backlash between the slackless gear 10 and the potentiometer gear 11.
Claims (4)
1. An electric actuator for opening or closing a valve mounted on a pipe, comprising: the method comprises the following steps:
the device comprises an upper shell (2-1), a lower shell (2-2), reversible motors (3) arranged on the upper shell and the lower shell, a reduction box (4) connected with the reversible motors (3), a motor gear (5) arranged on an output shaft of the reduction box (4), a large intermediate gear (5-1) meshed with the motor gear (5), a small intermediate gear (6-1), a main gear (6) meshed with the small intermediate gear (6-1), a main gear (6) fixed on an output shaft (7), an output shaft fixing plate (9), a cam shaft (8), a gapless gear (10) and a cam (17) fixed on the cam shaft (8), a potentiometer gear (11) arranged on an output shaft of a potentiometer (12), a limit switch (18) and a control panel (16); wherein the content of the first and second substances,
the reversible motor (3) is electrified to enable the reversible motor (3) to rotate positively and negatively, motor power is transmitted to the output shaft (7) through the reduction gearbox (4), the motor gear (5), the intermediate gears (5-1) and (6-1) and the main gear (6), when the output shaft reaches a valve full-open or full-close position, the cam (17) presses the limit switch (18) to cut off the directional power supply of the reversible motor (3), and the reversible motor (3) stops running.
2. The electric actuator of claim 1, wherein:
the gapless gear (10) comprises: a fixed gapless gear (12-2), a movable gapless gear (12-1), a wire spring (12-3), a snap ring (12-5) and an inner hexagonal fixing screw (12-4), wherein,
the fixed gapless gear (12-2) is fixed on the cam shaft (8) through the hexagon socket head cap fixing screw (12-4), and the movable gapless gear (12-1) is installed on the fixed gapless gear (12-2).
3. The electric actuator of claim 1, wherein:
one end of the wire spring (12-3) of the gapless gear (10) is inserted into the fixed gapless gear (12-2), and the other end of the wire spring (12-3) is inserted into the movable gapless gear (12-1).
4. The electric actuator of claim 1, wherein:
when the gapless gear (10) is meshed with the potentiometer gear (11), two adjacent teeth of the fixed gapless gear (12-2) and the movable gapless gear (12-1) are staggered by more than one tooth, the teeth of the fixed gapless gear (12-2) and the movable gapless gear (12-1) clamp the teeth of the potentiometer gear (11) under the action of the spring restoring force of the wire spring (12-3), and the tooth surfaces of the gapless gear (10) and the potentiometer gear (11) rotate in a sticking way all the time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121977684.2U CN217003304U (en) | 2021-08-23 | 2021-08-23 | Electric actuator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121977684.2U CN217003304U (en) | 2021-08-23 | 2021-08-23 | Electric actuator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217003304U true CN217003304U (en) | 2022-07-19 |
Family
ID=82367465
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121977684.2U Active CN217003304U (en) | 2021-08-23 | 2021-08-23 | Electric actuator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217003304U (en) |
-
2021
- 2021-08-23 CN CN202121977684.2U patent/CN217003304U/en active Active
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