Tension control method and tension control system

Abstract

The invention belongs to the technical field of industrial control and particularly relates to a tension control method and a tension control system. The method comprises the following steps that theinitial rolling diameter ratio of an electronic gear module is set, and a main shaft and an auxiliary shaft are started to operate; an encoder of the main shaft counts feedback pulses in the operationprocess, and sends the counting number to the auxiliary shaft, and the auxiliary shaft does following operation according to the received number of pulses; when the auxiliary shaft rotates by a circle, the rolling diameter ratio is calculated again; a position closed loop module calculates a control speed value and sends the control speed value to a speed closed loop module; the speed closed loopmodule adjusts the control speed value and then sends the control speed value to a torque closed loop module; the torque closed loop module calculates the torque value and sends the torque value to the auxiliary shaft, and a motor carries out tension control; and the above steps are repeated, and continuous control over tension is achieved. The method has the characteristics of being small in tension fluctuation, high in response speed, high in precision, good in small-tension effect and the like, and stability and precision of tension control are effectively improved.

Description

technical field [0001] The invention belongs to the technical field of industrial control, and in particular relates to a tension control method and a tension control system. Background technique [0002] Tension control refers to the technology of automatically controlling the tension of the processed material that is continuously moving or stationary between two processing equipment. This technology requires that the stretching degree of the raw material can be controlled within a certain range during the process of being conveyed on the equipment, that is, the equipment must remain effective at any operating speed, including the acceleration, deceleration and constant speed state of the equipment; even in the running state In the event of an emergency stop during the process, it should also be able to ensure that the transported materials are not damaged. Therefore, the stability of tension control has a direct relationship with the quality of the product. If the tensio...

AI Technical Summary

Problems solved by technology

If the tension is insufficient, the raw material will easily drift during the conveying process, and the finished paper after slitting and rewinding will be wrinkled; if the tension is too high, the raw material will be easily broken and damaged, which will reduce the qualified rate of the finished product. Increase the loss of raw materials and production input

[0003] At present, there are roughly three tension control schemes on the market: the first is magnetic powder clutch + tension controller, which has the advantages of simple, convenient, relatively stable and mature control methods, but the disadvantages of this technology are high price, short lifespan, and The object is single, and the expandability and development are poor. In addition, the magnetic powder of the equipment needs to be replaced every once in a while, and the production cycle is short; the second type is the inverter + asynchronous motor, which has the advantages of simple maintenance and short development cycle. The disadvantage of the technology is that the response speed of the motor is slow. When the spindle is accelerating and decelerating, the tension fluctuation of the system is particularly large and the stability is poor; the third is the torque open-loop control mode composed of a servo drive + servo motor. The reason is that the response speed of the open-loop control is slow, and it is easy to loose / pull the material during acceleration and deceleration, and the tension fluctuates greatly; the effects of these three solutions on the market are not very ideal.

Images