In the process of metal processing, the straight line wire drawing machine is a very common type of equipment. The progress of its technology and the popularization of frequency converters have begun to be used in large-scale straight line wire drawing machine in use. The functions of drawing type setting, operation automation, production process control, real-time closed-loop control, automatic meter counting, etc. can be realized by PLC.
The straight line wire drawing machine adopts the advanced technology and remarkable energy saving of the variable frequency speed control system. The speed regulation range is 30:1 during normal operation, and can provide more than 1.5 times of rated torque at 5% rated speed. The system logic control of the straight line wire drawing machine is more complicated, and there are various linkage relationships, which are realized by PLC. Synchronization control is all implemented inside the Insulator inverter and does not depend on external control.
The straight line wire drawing machine operator determines the speed of the operation in the panel setting. The analog signal of the speed enters the PLC. The PLC outputs the analog signal according to a certain slope after considering the time of acceleration and deceleration. The purpose of this is mainly to meet the needs of some operations such as jogging and threading. The analog voltage signal output by the PLC is simultaneously connected to the AI2 (AI1 ok) input of all the inverters as the main reference signal of the speed. The signals of the swing arm displacement sensors are connected to the corresponding drum drive inverters as feedback signals of the PID control. According to the position of the swing arm in the middle, set a PID default value. This system is a very typical PID control system with feedforward. The first level is one level and the PID is used as the fine adjustment amount.www.chinawiredrawingmachine.com