Servo system of linear welding unit of mini-car body

MO Yi-min， LIANG Wei， WANG Jin-tao， ZHANG Jie
（School of Mechanical and Electronic Engineering， Wuhan University of Technology， Wuhan 430070， China）

Abstract： Aiming at the problems of low welding quality，large welding workload on manual welding and high cost on welding robot when welding the skirt of a mini-car body，according to the actual demand and the distribution characteristics of the skirt's welding spots of car body，a kind of servo system of linear welding unit of car body was designed. In the servo system of linear welding unit，the linear motion of the stage and the welding motion of the electrode holder were controlled by PLC. To make system structure compact and save conductive material，the electrode holder and the transformer were fixed on the stage by conducting module，which uses the design method of integrated structure. The position switch and the anti-collision screw were used as security module to prevent the stage running over range. The results indicate that the design on the servo system of linear welding unit improves welding quality and efficiency，reduces the production cost，simplifies the product line，ameliorates ergonomics and realizes simple automation easily. This system replaces manual welding，which has specific engineering application prospects and plays a referenced and enlightening role on implementing the design and renovation of low-cost automatic production line for related-companies and researchers.
Key words：linear welding； servo system； conducting module； security module