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How is the frequency converter used in the wire drawing machine
Apr 28, 2018

Wire drawing machine is one of the main processing equipments in the wire and cable industry. It mainly processes copper wires into various specifications of thin wires. It is generally composed of pay-off, water cooling, take-up, and cable arranging, among which the electric drive is mainly composed of pay-off wires. The motor and the take-up motor and the wire motor are realized. With the constant promotion of frequency conversion technology, frequency converters are increasingly being used in wire drawing machine equipment.

Frequency conversion control principle:

The main electrical components of the wire drawing machine The wire drawing machine is mainly composed of a pay-off motor, a take-up motor and a wire drive motor. As the wire diameter does not increase, the speed of the wire take-up motor should be reduced accordingly to ensure the wire speed. Constant, tension feedback device is often used in the control to adjust the speed of the take-up motor. As the function of the frequency converter is continuously enhanced and the performance is constantly stable, the frequency converter is also used in a drawing machine, in which an inverter is used to control the take-up motor and the take-off motor, and the line motor is directly controlled by the grid voltage because the power is small.

Basic control principle:

The take-off motor and the take-up motor are controlled by two inverters respectively. The take-off frequency converter passes the external potentiometer speed, the take-up frequency converter is output from the analog output signal of the line-up frequency converter, and the tension balance feedback signal is passed by the PID regulator. After the control of the line converter. As the winding diameter of the take-up spool changes, the feedback signal of the tension balance lever also changes. The feedback signal of the tension rod (consisting of a precision rheostat) is converted into 0 to 10V by the signal conversion circuit board. This signal is analog to the AM of the payoff converter. , AM-output signal constitutes PID two-way input signal, after the PID adjustment control take-up line inverter, so that the wire to maintain a certain linear speed.

After the inverter is started, the OC output control signal from the line-up frequency converter starts the line motor. The smaller line motor power directly controls the forward and reverse operation through two contactors, so that the copper wire is evenly wound on the take-up spool.