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Talking about the role of tension in slitting lines

Source:Trueland     Time:2023-07-04 Hits:

The rewinding and unwinding process of slitting lines requires balance tension control, and the tension is given through the tension controller. The principle of tension controller control is to calculate the roll diameter by detecting the winding line speed, load torque = F*D/2 (F is the set tension, D is the current roll diameter), so when the tension is set , because the current roll diameter has been known through calculation, so the load torque can be calculated.

Slitting lines-tension control can output standard 0-10V analog signal, corresponding to the rated torque of asynchronous motor. So we use the analog signal to connect to the frequency converter and select the torque given. In this way, the stability of tension can be ensured during the whole dynamic process of winding.

In the form of inverter torque, limit the speed. In the tension control mode, regardless of the DC motor, AC motor or servo motor, the speed must be limited. Otherwise, when the torque generated by the motor can overcome the load torque and run, rolling acceleration will occur, and the speed will continue to increase. Accelerate to high speed.

slitting lines

The speed of rewinding and unwinding is limited by the analog output AFM of the spindle B series inverter, that is, the parameter 3-05 (analog signal output selection) on the spindle B series inverter is set to 03 (frequency command output ). The signals are respectively connected to the analog comfort port of the rewinding and unwinding frequency converter as the setting signal of the frequency given and sad frequency.

Slitting lines-zero-speed tension control requires that when the unwinding and unwinding rolls are running at 0Hz, there is a certain tension output on the output shaft of the motor, which is adjustable. This requirement is mainly to prevent parking during the rewinding and unwinding operation, and to ensure that the rewinding and unwinding head will not loosen when restarting. In this control system, the requirement can be met by adjusting the initial tension setting on the tension controller.

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