The Principle of Control Technology of Linear Wire Drawing Machine and the Introduction of PLC Control System

The Principle of Control Technology of Linear Wire Drawing Machine and the Introduction of PLC Control System

Wire drawing machine is a kind of mechanical equipment widely used in industry. Its main function is to process metal materials with thick wire diameters into thin wires of various specifications. The electrical transmission part of the straight line wire drawing machine is mainly realized by the wire-paying motor, the wire-drawing motor and the wire-receiving motor.


1. The Principle of the Control Process of the Straight Line Wire Drawing Machine


There are many types of wire drawing machines. Generally, the materials and specifications of tool products are different. The straight line wire drawing machine has good precision and drawing stability. It is the main processing equipment in the metal cable manufacturing industry. The work engineering of the straight line wire drawing machine can basically be divided into three parts of the process, such as unwinding, drawing, and winding. The wire-drawing of metal cables does not require too high precision for the control of the whole wire-drawing machine. Big difference. The working speed of the winding link determines the production efficiency of the entire wire drawing machine. Commonly used control technologies include synchronous control and tension control to realize the winding of metal products.


2. PLC Control System of Straight Line Wire Drawing Machine


The straight line wire drawing machine is mainly composed of a pay-off motor, a take-up motor and a wire-drawing motor to form the driving part. The operation of the pay-off motor is driven by a frequency converter, and the wire tension in the wire-drawing link is drawn and sent to the wire-drawing machine to achieve free pay-off. The wire-drawing link uses multiple motors to stretch the metal cable at the same time, which requires high synchronization of the motors. In this link, there are multiple drums equipped with tension sensors to detect the tension during the wire-drawing process, and finally sent to the Take-up motor. The winding motor is connected to the tension sensor through a photoelectric encoder, and the tension signal is fed back to the wire drawing link to further control the winding to keep the winding line speed constant.


The drawing machine system adopts advanced PLC control mode. Among them, the PLC is the core of the control system, the frequency converter and the asynchronous AC motor are the controlled objects, 6 AC motors are controlled by 6 frequency converters, and the tension sensor is used for the tension detection device of the 4 reel drawing wires. The electrical circuit of the whole machine is simplified, the system failure rate is low, and the service life is long. The frequency converter can smoothly and steplessly adjust the speed of each motor under the control of PLC, realizing various actions and functions in the working process of the wire drawing machine.


The rest of the system, such as cylinder clamping, wire drawing, running indicator light, alarm, start and stop, manual and automatic mode switching, emergency stop and other logic control functions, can write a suitable PLC control program according to the production process.

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