Film type execution mechanism with side type hand wheel mechanism

Abstract

A film type execution mechanism with a side type hand wheel mechanism comprises a support, a film head assembly, a hand wheel mechanism assembly and a manual and automatic switching assembly. The film head assembly is located above the hand wheel mechanism assembly and fixedly connected with the hand wheel mechanism assembly and is used for executing reciprocating motion. The hand wheel mechanism assembly is located above the support and fixedly connected with the support and is used for executing manual operation. The manual and automatic switching assembly is located in the support and fixedly connected with the hand wheel mechanism assembly and is used for quickly switching a manual mode and an automatic mode. According to the film type execution mechanism with the side type hand wheel mechanism, a hand wheel of the execution mechanism is located on the side of the mechanism, the problem that operation cannot be executed due to an execution mechanism is too high is solved, meanwhile a pressing ring type structure is adopted for switching between the manual mode and the automatic mode, the manual state and the automatic state can be switched directly, no corresponding parts need to be mounted, operation cost is lowered, the problem that site mounting is difficult is solved, meanwhile working efficiency is improved, and the cost performance of the mechanism is enhanced.

Description

technical field [0001] The invention relates to a membrane type actuator with a side-type handwheel mechanism. Background technique [0002] Due to its reasonable structural design, no friction during reciprocating motion, reliable sealing, long service life, and convenient inspection and maintenance, the thin film actuator is widely used by control valve manufacturers. With the enlargement of oil refining, ethylene, and thermal power plants at home and abroad, the diameter of valves is getting larger and larger, and the actuators required to drive valves are also getting larger. Sliding nut handwheels are widely used in small film actuators. Due to the small output force of the mechanism, it can no longer be used on the actuator with large effective area and large output force. At the same time, the traditional top-mounted handwheel actuator needs to be installed above the membrane head of the actuator, and a special operation platform needs to be set up for on-site operati...

AI Technical Summary

Problems solved by technology

With the enlargement of oil refining, ethylene, and thermal power plants at home and abroad, the diameter of valves is getting larger and larger, and the actuators required to drive valves are also getting larger. Sliding nut handwheels are widely used in small film actuators. Due to the small output force of the mechanism, it can no longer be used on the actuator with large effective area and large output force. At the same time, the traditional top-mounted handwheel actuator needs to be installed above the membrane head of the actuator, and a special operation platform needs to be set up for on-site operation. , causing great inconvenience to the site

[0003] At present, most common actuators on the market use positioning pins to install and pull out to realize manual and automatic switching. For positive-acting actuators with long strokes, the spring set needs to be compressed to confirm the position of the pin hole when the actuator is assembled. After marking, reinstall the actuator to ensure the correct position of the pin hole. Special equipment is required to compress the spring assembly to realize the installation and positioning of the positioning pin, which is very inconvenient for on-site maintenance

[0004] Due to the long stroke of the large-diameter regulating valve itself, the height of the valve body and the bonnet is relatively high, and the height of the actuator driving the large-diameter regulating valve is relatively high. If the top-mounted handwheel mechanism is still used, the distance between the operating handwheel of the handwheel mechanism The height of the operating platform is high, which makes the on-site operation inconvenient

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