Manual engagement and disengagement mechanism of electric actuator

Abstract

The invention discloses a manual engagement and disengagement mechanism of an electric actuator. The manual engagement and disengagement mechanism comprises a box body, a motor, a worm wheel and a worm, wherein the motor, the worm wheel and the worm are arranged in the box body, and the worm wheel and the worm mesh with each other; a hand wheel end cover is detachably arranged on one side of the box body through bolts; one end of the worm is connected with a rotating shaft of the motor; and the motor is connected with a power supply. The manual engagement and disengagement mechanism is characterized in that an ejector rod movably penetrates through the hand wheel end cover, the inner side of the ejector rod can drive the worm to rotate through a linkage device, a pull pin capable of beinginserted into the linkage device movably penetrates through the box body, and the pull pin is provided with a resetting device. The linkage device of the manual engagement and disengagement mechanismof the electric actuator comprises a direct driving mode and a speed increasing mode, so that the stock and die input of part production are greatly reduced, and the requirements of different customers on multiple turns of the actuator and easy shaking of a hand wheel can be met; two manual engagement and disengagement modes are set in the box body and share a microswitch, an inner spline sleeve or a central wheel is pushed by pressing the ejector rod by hand, the inner spline sleeve or the central wheel can also abut against the microswitch to cut off the power supply of the motor firstly soas to stop the motor, and thus a valve can be opened or closed safely even under the condition of misoperation of the hand wheel.

Description

technical field

[0001] The invention relates to a manual clutch mechanism of an electric actuator. Background technique

[0002] Electric actuators are mainly used in the automatic control of on-off valves, through which the valves can be automatically controlled locally or remotely, and are widely used in hydropower, petroleum, chemical and other fields. A kind of manual clutch of the current electric actuator is that the handwheel is not connected to the worm, but directly drives the output by the handwheel. The problem is that it will be particularly difficult to perform manual switching in places with large torque output. In the case of a stuck valve, the worm gear Self-locking, the output force is always maintained, so that the clutch switching does not move. Another manual clutch of the electric actuator is that the handwheel is connected to the worm, but it is necessary to shake the handwheel while pushing the handwheel, that is, the handwheel needs force in two dire...

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