Linear stroke transmission device of electric valve actuator

Abstract

The invention relates to a linear stroke transmission device of an electric valve actuator, which comprises a thrust base, a bracket, a driving shaft housing and a thrust rod. One end of the thrust rod is provided with a screw rod, and the other end thereof is fixedly connected with a valve rod of a controlled valve by a plywood; the two sides of the plywood are embedded in the vertical groove ofthe bracket; as the screw rod of the thrust rod is provided with arc groove threads, the driving shaft housing is evenly provided with ball bearing holes along the spiral direction corresponding to the arc groove threads of the thrust rod, and ball bearings and needle rollers are arranged in the ball bearing holes; the ball bearings are provided with spherical circular arcs matched with the thrustrod arc groove threads; and the driving shaft housing outside the needle rollers is provided with a fixed housing. External threads of the thrust rod are matched the ball bearings in the driving shaft housing in a rolling way for transmission so as to reduce the friction and improve the fitting accuracy thereof; in addition, the transmission device has the advantages of stable and reliable accuracy control, and long product service life and the like, thus being applied to adjustment of the valve actuator.

Description

Linear drive for electric valve actuators technical field The invention relates to an actuator transmission device, in particular to a linear stroke transmission device of an electric valve actuator. The invention is applicable to the transmission device of the regulating valve actuator. Background technique The linear transmission device of the existing electric valve actuator generally includes a thrust base, a bracket, a drive bushing, and a push rod. Installed in the thrust base, the screw with external thread at one end of the push rod is connected with the internal thread nut of the drive bushing, the other end of the push rod is fixedly connected with the valve stem of the adjusted valve through the clamping plate, and the two sides of the clamping plate Embedded in the vertical groove of the bracket. When the thrust base and the drive bushing are rotated by the turntable of the motor output shaft of the electric valve actuator, due to the restriction of the plywo...

AI Technical Summary

Problems solved by technology

The disadvantage is that the screw of the push rod and the inner threaded nut of the drive bushing cooperate with each other for transmission during use, and the hardness and wear resistance of the screw can be improved through the quenching process, while the copper nut of the drive bush is not easy to harden Therefore, in the process of cooperation between the two, the internal thread nut of the drive bushing is very easy to wear. After long-term use, the cooperation gap between the two increases, reducing the adjustment accuracy and shortening the service life of the product.

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