Method for automatically adjusting length of screw of low-voltage circuit breaker bimetallic strip

Abstract

The invention discloses a method for automatically adjusting the length of a screw of a low-voltage circuit breaker bimetallic strip. The method comprises the steps of capturing the image information of a screw and a nut of the low-voltage circuit breaker bimetallic strip by use of a CCD (Charge Coupled Device) camera in real time, and then inputting the image information which is subjected to A / D conversion by using an image acquisition card previously to a computer system, processing the image information by the computer system to obtain the central coordinate information of the screw and the nut and sending the central coordinate information to a PLC (Programmable Logic Control) unit in the form of pulses, and then driving an axial moving platform and a motor to displace so as to adjust the length of the screw. The method is capable of realizing automatic adjustment of the length of the screw by automatically detecting the moving state of the screw by use of the visual positioning technology and calculating the central coordinates of the screw according to the Hough algorithm, and therefore, the traditional manual positioning adjustment manner is changed, the detection efficiency and the accuracy and stability of the system are improved, and the reliability of overload protection of the low-voltage circuit breaker is improved; the method has practical value.

Description

technical field [0001] The invention relates to a method for automatically adjusting the length of a low-voltage circuit breaker bimetal screw, specifically, a method for automatically adjusting the length of a low-voltage circuit breaker bimetal screw by using visual positioning technology, and belongs to the technical field of low-voltage circuit breaker overload protection . Background technique [0002] Overload protection is one of the important functions of low-voltage circuit breakers. Its working principle is: when the circuit breaker’s loop current exceeds the rated value, the bimetal strip is deformed by heat and shifts to one side of the release until the bimetal strip on the The tripping screw pushes against the tripping device, so that the tripping action of the tripping device occurs and the circuit current is cut off. For the detection of circuit breaker overload protection, most of the current market adopts the method of manually adjusting the bimetal screw,...

AI Technical Summary

Problems solved by technology

For the detection of circuit breaker overload protection, most of the current market adopts the method of manually adjusting the bimetal screw, that is, if the circuit breaker does not operate within the specified time, manually adjust the position of the screw nut on the metal plate, and the screw can be adjusted after adjustment. Top jump tripping device, this manual adjustment method is not only inefficient, but also causes certain errors due to manual detection

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