I. Overview
Slitting machine is a kind of wide paper or film slitting into a number of narrow material mechanical equipment, often used in papermaking machinery and printing and packaging machinery.
The transmission system is mainly composed of one main inverter, one unwinding inverter and two winding inverter.
The host inverter works in the open loop vector mode to control the system speed.
The unwinding frequency converter and two winding frequency converters work in the open-loop torque mode to control the system discharging and the up and down receiving after cutting.
Slitter tension control system scheme description:
The host inverter uses the Huichuan universal inverter MD500 to control the running speed of the scutter. It works in the open loop vector mode, and the main speed is generally adjusted by the potentiometer. The AO1 port is used as the output of the running frequency and is given as the line speed of the unwinding converter and the upper and lower winding converter.
The unwinding frequency converter and the winding frequency converter use the Huichuan MD330 tension special frequency converter, all of which work in the open-loop torque mode. Huichuan MD330 inverter is a frequency converter that can realize constant tension control. The real-time coil diameter can be obtained through the calculation of the internal frequency converter, and the constant tension control can be obtained by controlling the output torque of the frequency converter.
Advantages of the scheme:
Cutting machine tension control system is simple, simple debugging, and the constant tension control is basically not affected by the speed, can achieve high speed cutting;
By setting reasonable parameters of system inertia compensation, friction compensation and material inertia compensation, the tension control system of slitting machine can compensate the uneven speed caused by system inertia, friction resistance and material inertia in the process of starting or accelerating, and obtain very stable tension control effect.
Moreover, the winding frequency converter can realize taper control, achieve the effect of winding tightly, overcome the inherent weakness of magnetic powder, make high speed cutting control become a reality, and greatly improve the reliability of the equipment.