The working principle of the wire drawing machine equipment is: based on the operator setting the speed of the operation on the panel, the analog signal of this speed enters the PLC, and the PLC outputs the analog signal according to a certain slope after considering the time for increasing or decreasing the speed. The main purpose of doing this is to meet the needs of some tasks such as jogging and threading. The analog voltage signals output by the PLC are connected together to the AI2 (AI1 can also) input terminals of all frequency converters as the main given signal for speed. The signals of each swing arm displacement sensor are connected to the corresponding drum drive frequency converter as response signals for PID control. Set a given PID value based on the orientation of the swing arm at the center. This system is a very typical PID control system with feedforward, cascaded one level at a time, with PID as the fine-tuning variable.
Due to the fact that the stability of the system largely depends on the PID function, it is necessary to consider the tuning of its parameters comprehensively, taking into account situations such as low speed, high speed, acceleration, and deceleration. In addition, it is necessary to participate in differential limiting in this system. After optimizing the parameter values, this system achieved a very stable speed of 600 meters/min during equipment testing, completely solving the problem of instability under the high speed of the original synchronous board (which could only be driven to 300 meters/min). The wire drawing machine equipment has undergone comparative tests under various working conditions, and its performance is the same as that of the wire drawing machine using imported DC drivers. The equipment efficiency is between 90% and 95%, and the power saving rate is about 40%. Moreover, the electrical device configuration of this system is concise, with clear logic, and there is a significant cost reduction compared to the original, which is indeed a cost-effective solution.
In metal processing, wire drawing machine equipment is a common type. In the past, DC generator electric motor sets (F-D system) were generally used to complete it. Now, with the advancement of process technology and the widespread use of frequency converters, variable frequency control has been widely used in wire drawing machine equipment, and PLC can be used to complete functions such as drawing type setting, active operation, production process control, real-time closed-loop control, and active meter counting.
