The role of metal slitting line tension

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

Metal slitting wire tension control can output standard 0-10V analog signal, corresponding to the rated torque of the asynchronous motor. So we use the analog signal to connect to the inverter and select the torque given. This ensures constant tension throughout the dynamic process of winding.

In inverter torque mode, the speed is limited. In the tension control mode, the speed of the DC motor, AC motor or servo motor must be limited. Otherwise, when the torque generated by the motor can overcome the load torque and run, it will generate rotational acceleration, and the speed will continue to increase. Accelerating to high speed is the so-called flying car. The speed of rewinding and unwinding is limited by the analog output AFM of the spindle B series inverter, and the parameter 3-05 (analog signal output selection) on the frequency conversion of the spindle B series is also set to 03 (frequency command output). The signal is respectively connected to the analog comfortable port of the rewinding and unwinding inverter, as the setting signal of frequency given and sad frequency.

Metal slitting line - zero-speed tension control requirements, when the rewinding and unwinding is 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 when the rewinding and unwinding is running, and it can ensure that the rewinding and unwinding pan head will not loosen. In this control system, the requirements can be achieved by adjusting the initial tension setting on the tension controller. Structure of slitting machine: Slitting main machine: The frame is all welded with steel plates and normalized after annealing; the upper knife shaft is lifted and lowered synchronously, the motor is a 0.75KW cycloid motor, the size of the knife shaft is Φ160X1050mm, and the material is 42CrMu quenched and tempered. Handling HRC38°-40°, one fixed arch is 480mm thick, and one movable arch is 200 mm thick, driven by hydraulic cylinder, the cutter shaft is driven by the universal joint of the synchronous box, side guide: four-column manual side guide, both sides can be Independent control, the adjustment range is 200-1000mm. Pinch rollers: two pinch bags are finely ground with Nitrile rubber, the diameter of the rollers is 130X1000mm, and the hydraulic pressure rises and falls synchronously.