PLC servo control device and method of shaking/rotating arc welding system

Abstract

The invention discloses a PLC servo control device and method for a shaking / rotating electric arc welding system. The device comprises a touch shaking / rotating electric arc welding parameter setting and displaying device, a programmable logic controller, a welding time sequence control circuit, a servo motor driver and a serial programming interface. The programmable logic controller is connected with a welding time sequence control circuit and a programmable touch welding parameter setting and display, and is connected with a programmable servo motor driver through a level conversion circuit; and the servo motor driver is connected with a servo motor in the arc shaking / rotating mechanism. Through a touch screen operation mode, an electric arc motion mode (shaking or rotating) is selected, shaking / rotating electric arc welding parameters are set, an electric arc shaking midpoint is automatically positioned according to rotating position information of a servo motor, electric arc shaking / rotating frequency is detected and displayed, and accurate digital control over shaking or rotating electric arc welding is achieved. The control precision is high, the programmability is good, the operation is convenient, and the practicability is strong.

Description

technical field [0001] The invention relates to the technical field of arc welding, and relates to a PLC servo control device and method for an oscillating / rotating arc welding system. Background technique [0002] Gas metal arc welding (GMAW) is a high-efficiency arc welding method that uses gas or gas / slag as the protective medium. When applied, it is often necessary to improve the weld shape by swinging, rocking or rotating the arc. In particular, in narrow gap welding, it is necessary to adjust the heat input of the welding arc through the shaking or rotating motion of the arc to solve the problem of poor fusion of the two side walls of the narrow gap groove. At present, in the oscillating / rotating arc GMAW welding system, there are still problems such as low integration of control devices, inconvenient setting of arc oscillating / rotating parameters, low positioning accuracy of arc oscillating midpoint, arc oscillating midpoint positioning and arc shaking / rotating frequ...

AI Technical Summary

Problems solved by technology

Its disadvantages are: ①The structure of the control device is scattered, requiring two single-chip microcomputers to participate in the control, and the control circuit is relatively complicated; ②The positioning of the midpoint of the arc shaking and the detection of the shaking frequency are realized by additional devices such as photoelectric switches, and the positioning and detection accuracy is not high; ③ The welding parameters are set through the mutual cooperation of the rotary encoder and the hardware button, which is inconvenient to operate; ④Using assembly language to write the control program, the program writing is more complicated, the programmability is not good enough, and it is not easy to control function expansion and later maintenance; ⑤Applicable Narrow range, only usable for shaking arc welding

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