Pneumatic long-stroke actuating mechanism and control method thereof

Abstract

The invention relates to a pneumatic long-stroke actuating mechanism and a control method thereof. The pneumatic long-stroke actuating mechanism comprises a rack, a cylinder, a manual device and a control device, wherein a rotatable main shaft is arranged at the top part of the rack, one end of the main shaft is fixedly connected with a swinging arm, and the middle part of the main shaft is connected with a driving swinging arm; the cylinder is arranged at the lower part of the rack, the control device controls the movement of a piston of the cylinder, and a piston rod of the cylinder is fixedly connected with the driving swinging arm; and the manual device is arranged at the top part of the rack and is connected with the main shaft in a separable-transmission manner by an eccentric wrenching wheel and a worm gear. The control method comprises the following step of carrying out signal breaking, power off and air-source cutting off for protection on the actuating mechanism. The pneumatic long-stroke actuating mechanism has the advantages of strong stability, high accuracy, compact structure, light weight and convenience in installation, can be convenient to realize manual-automatic control switching, can be widely applicable to industrial departments such as power, petrochemistry, metallurgy and the like, and is especially suitable for being installed and used in high-temperature and vibrating environments.

Description

technical field [0001] The invention relates to a valve control device, in particular to a pneumatic long-stroke actuator and a control method thereof. Background technique [0002] Most of the existing integrated pneumatic actuators are composed of pneumatic components that output work instructions to the work spindle through the transmission link mechanism to realize the movement of valves and dampers. In actual use, it is found that the above-mentioned existing pneumatic long-stroke actuators have some shortcomings, because they fail to achieve the best use effect, and their shortcomings can be summarized as follows: [0003] 1. Since the existing pneumatic actuator adopts a mechanical positioner, and its connection mechanism is prone to errors in processing, installation, connection, etc., it will affect the stability and accuracy of the actuator to a certain extent, and affect the system. Running stability and control accuracy, which do not match the increasingly high ...

AI Technical Summary

Problems solved by technology

In actual use, it is found that the above-mentioned existing pneumatic long-stroke actuators have some shortcomings, because they fail to achieve the best use effect, and their shortcomings can be summarized as follows:

[0003] 1. Since the existing pneumatic actuator adopts a mechanical positioner, and its connection mechanism is prone to errors in processing, installation, connection, etc., it will affect the stability and accuracy of the actuator to a certain extent, and affect the system. Running stability and control accuracy, which do not match the increasingly high adjustment requirements of the automation system;

[0004] 2. The transmission mode of the screw and the slider is easy to appear on the spot, which is not conducive to the environment with a lot of dust;

[0005] 3. It is large in size and heavy in weight, which is not conducive to installation, and its temperature resistance and shock resistance are poor;

[0006] 4. The existing pneumatic actuator lacks a manual-automatic switching device. The manual-automatic switching function is inflexible and prone to failure, which is often not conducive to the handling of emergencies, equipment maintenance, etc. The safety performance of the equipment needs to be further improved

[0007] It can be seen that the above-mentioned existing pneumatic long-stroke actuator obviously still has inconvenience and defects in structure and use, and needs to be further improved urgently.

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