Top mounted hand wheel mechanism

Abstract

The invention relates to a valve auxiliary manual mechanism, and particularly relates to a top mounted manual wheel mechanism applicable to a pneumatic diaphragm actuating mechanism. The top mounted hand wheel mechanism provided by the invention is applicable to the pneumatic diaphragm actuating mechanism, and at least comprises a hand wheel, a transmission shaft, a screw nut component and a connecting piece, wherein the transmission shaft is fixedly connected with the hand wheel, and is provided with an external thread; the screw nut component is sleeved on the transmission shaft, is in threaded connected with the external thread, and is provided with a first containing unit allowing the movement of the connecting piece; the connecting piece is provided with a connection rod, and can move in the first containing unit; the upper end of the connecting piece is limited to the first containing unit; and the connection rod can be connected with a pushing rod in the pneumatic diaphragm actuating mechanism. Compared with the prior art, the top mounted hand wheel mechanism provided by the invention can be universally applied to a positive acting-type pneumatic diaphragm actuating mechanism and a reverse acting-type pneumatic diaphragm actuating mechanism.

Description

technical field [0001] The invention relates to a valve auxiliary manual mechanism, in particular to a top-mounted handwheel mechanism applicable to positive-acting and reverse-acting pneumatic film actuators. Background technique [0002] Pneumatic film regulating valve is a kind of control device in the combination instrument of pneumatic unit. It is one of the important devices in the automatic adjustment system of the production process. It can be widely used in automatic adjustment and remote control of chemical industry, petroleum, metallurgy, electric power, light textile industry. At present, the commonly used pneumatic film regulating valve is mainly composed of a valve mechanism and an actuator, and the two are connected by a push rod connected in the middle. However, due to the limitations of the structure of the pneumatic actuator itself, there is always the possibility of failure of the actuator or the control air source, such as power failure, gas failure, or ...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a top-mounted handwheel mechanism to solve the problem that the existing handwheel mechanism in the prior art can only be used for positive-action pneumatic film actuators, or can only be used for reverse-action pneumatic film actuators. Technical issues that cannot be applied universally to positive-acting pneumatic film actuators and reverse-acting pneumatic film actuators

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