Clutch type safe switchover hand wheel mechanism of pneumatic actuator

Abstract

The invention discloses a clutch type safety switchover hand wheel mechanism of a pneumatic actuator. The clutch type safety switchover hand wheel mechanism mainly comprises a hand wheel, a switchover handle, a box body, a box cover and a worm and gear transmission device which is arranged in an inner cavity formed by the box body and the box cover, the hand wheel is moved and turned, worms located in two eccentric half shafts are swirled, so that an output shaft located on a worm wheel can be driven to rotate, and a manual driving of a valve device can be achieved by the hand wheel mechanism. The switchover handle is swirled to a manual position, and an integrated safety protective device, namely a gas source pipeline which can automatically shut down pneumatic control, is located on the eccentric half shafts so as to prevent mechanism damages caused by the fact that the gas source is suddenly switched on due to operation faults. Compared with traditional safety devices, the clutch type safety switchover hand wheel mechanism has the advantages that the integration and the safety are high, and the operation is reliable.

Description

technical field [0001] The invention relates to the field of pneumatic control valves, in particular to a clutch-type safety switching handwheel mechanism added between the pneumatic actuator and the valve when the pneumatic actuator fails to work and the pipeline is in danger. Background technique [0002] The handwheel mechanism in the prior art is mainly composed of a box body, a worm wheel arranged inside the box body, a worm screw, and an eccentric half shaft fixedly connected to the two ends of the worm screw in a cylindrical shape and non-coaxially connected with the worm screw. A hand wheel fixedly connected to an eccentric half shaft, and a switching handle fixed on the eccentric half shaft. When the switching handle is at the lower position, the worm is separated from the worm wheel; when the switching handle is moved to the upper position, the worm is combined with the worm gear, and The handwheel then drives the worm to rotate, and the worm then drives the worm w...

AI Technical Summary

Problems solved by technology

As a safety component, this structure is relatively easy to reduce its reliability due to the influence of external complex working conditions

[0004] So in general, the traditional handwheel mechanism used for pneumatic manual switching has no safety protection device. Once in the manual position, the air source is suddenly connected for some reason, which is very easy to damage the handwheel mechanism, and even cause more serious joint accidents. ACCIDENT

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