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• Time of issue:2020-01-03
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(Summary description)What is the tension of the slitter
Slitting machine tension control refers to the ability to permanently and stably control the tension of raw materials when they are conveyed on the equipment. The tension control of the slitter is basically manual tension control and automatic tension control. Manual tension control means that when the roll diameter changes to a certain stage during the winding or unwinding process, the operator adjusts the manual power supply device to achieve the purpose of tension control.



Factors affecting the stability of tension
The factors that produce fluctuations and changes in tension are often complex, and the main influencing factors are roughly as follows:

1. The change of the machine's speed will inevitably cause the change of the tension of the whole machine:

2. During the winding and unwinding process of the slitting machine, the winding and unwinding diameters are constantly changing, and the change of the diameter will inevitably cause the change of the tension of the raw material. Under the condition that the braking torque remains unchanged, the diameter of unwinding will decrease and the tension will increase accordingly. The opposite is true for rewinding. If the rewinding torque is constant, as the rewinding diameter increases, the tension will decrease. This is the main factor that causes the tension of the raw material to change during operation;

3. Changes in the tightness of the raw material coil will also cause changes in the tension of the whole machine;

4. The non-uniformity of the material of the cutting raw material. Such as the fluctuation of material elasticity, the change of material thickness along the width and length, the eccentricity of roll quality, and the change of production environment temperature and humidity will also affect the tension fluctuation of the whole machine;

5. There are factors such as unbalance and unstable air pressure in the transmission mechanism of the slitting machine (such as guide roller, floating roller, flattening roller, etc.).

6. The change of speed during slitting affects the change of tension: When the speed is increased or decelerated, the speed of the main motor changes. First, it causes an instantaneous change in the tension of the material from the unwinding traction to the winding section, and the material must vibrate slightly after a period of time to gradually stabilize the tension. The instability of this stretch of tension is manifested in the uneven winding of the finished roll and the unevenness on the end surface, which affects the quality of the product.



How to adjust the tension of the slitting machine
The tension control system usually includes a tension detection mechanism, a tension controller, and a tension adjustment mechanism. According to the different tension detection methods and applications, the tension control system can have a variety of specific applications. The application performance analysis is as follows: when the tension sensor is used for direct detection, the tension sensor directly measures the actual tension value of the raw material, and then the tension value It is converted into a tension signal and fed back to the tension controller. By comparing this signal with the tension value preset by the controller, the control signal is calculated, and the execution unit is automatically controlled to adjust the actual tension value to be equal to the preset tension value to achieve the purpose of tension stabilization. It is currently a more advanced tension control method. When the coil diameter calculation type detection method is adopted, the current diameter of the winding or unwinding drum is obtained through cumulative calculation, and the control signal is output according to the change of the winding diameter to control the winding torque or the unwinding braking torque, thereby adjusting the adjustment. Car tension. This kind of tension control is not susceptible to external influences and can implement relatively stable tension control. However, due to the influence of factors such as the torque change, linear change and mechanical loss of the transmission device, the absolute accuracy of this tension control is poor. When the floating roller tension detection method is adopted, the floating roller potentiometer accurately detects the change signal of the floating roller position and feeds it back to the tension controller. The tension controller calculates and outputs the control signal to control the servo drive system to adjust, and then the floating roller Return to the original balance position. Since the floating roller tension detection device itself is an energy storage structure, it uses its own sinking effect to have a good absorption and buffering effect on a wide range of tension jumps, and it can also reduce the eccentricity of the raw material and the effect of speed changes on the tension. Influence. This system requires the cylinder friction coef