Automatic limiting mechanism of electric executer

Abstract

The invention relates to the field of electric executers applied in the industry, in particular to an automatic limiting mechanism of an electric executer. The automatic limiting mechanism comprises ashell, an input shaft, a drive gear, a rack, a transmission gear, an output shaft, a sliding way groove, springs, fixing seats, forced limiting blocks, a force arm and limiting switches. The transmission gear is fixed to the output shaft, and the output shaft is fixed to the shell through a bearing and a bearing seat. The fixing seats communicate with the output shaft and are fixed to the outer side of the shell. Grooves in which bolts can move by 360 degrees are formed in the fixing seats, and the forced limiting blocks are fixed to the fixing seats. The force arm is arranged on the outer sides of the forced limiting blocks and is fixed to the tail end of the output shaft. The limiting switches are fixed to the forced limiting blocks, the number of the forced limiting blocks is two, thenumber of the limiting switches is two, and the two limiting switches are arranged at two limiting positions in rotation of the force arm correspondingly, make contact with the force arm and cut off apower source. The automatic limiting mechanism of the electric executer is suitable for customization at any angle between 0 degree and 360 degrees, and the electric executer is started and stopped accurately.

Description

technical field [0001] The invention relates to the field of electric actuators used in industry, in particular to an automatic position-limiting mechanism of the electric actuator. Background technique [0002] Electric actuators are mainly used in mechatronic equipment in the field of industrial automatic control. They are often used for valve opening and closing. , the mechanical limit is mandatory limit protection, the existing mandatory limit mechanism will cause excessive damage to the motor and deceleration mechanism, the same is the electrical protection is also prone to failure phenomenon, or in the state of direct failure of the electrical protection will cause the motor and The deceleration mechanism is damaged or even the motor is burned. After the force arm of the electric actuator reaches the limit position, there is no safe, effective and reliable mechanical automatic limit mechanism. [0003] To this end, people have also proposed some solutions. For example...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the above-mentioned existing problems, and according to the part of the scheme [0004] in "A Mechanical Limiting Device for the Output Shaft of an Electric Actuator" disclosed in the Chinese patent literature with the utility model patent number ZL201621248656.6, it provides an electric The automatic limit mechanism of the actuator solves some technical defects of the current electric actuator;

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