Fuzzy Control of Welding Trolley Speed Based on PLC

摘要

In the course of modern steel rolling production, laser welding machine positioning system with welding trolley as the core device of is automated, which provides the possibility of continuous and efficient production of steel rolling. The quality of welding seam has been an obstacle of automatic and efficient production. Among them, speed of the welding trolley is an important factor affecting the quality of welding. In this paper, the fuzzy control of the welding trolley is adopted to make the driving of the trolley more stable and reduce the interference caused by the startup and stop of the motor, frictional force change of the ball screw, change of resistance in the walking process and the like. Speed change can be traced and its effect on the welding quality tends to be minimized, enabling the automation of the mill's production to be further improved. Since this project is based on the modification of the old B & R positioning system for the laser welding machine in pickling section of the cold rolling mill, Siemens S7-300 PLC program is used instead of the original B & R positioning system for position control in this project. Fuzzy control of welding trolley speed is applied to Siemens PLC program in order to realize its function and carry out corresponding research in this paper.