Tension control method, device and system of rolling and unrolling equipment

Abstract

The invention discloses a tension control method, device and system of rolling and unrolling equipment. The tension control method comprises the steps of obtaining the current linear velocity V<n> of operation of a material and the current frequency f<n> of a motor rotor; calculating out the current rolling diameter calculated value D<n> of the outer diameter of the material on a roller wheel every other time cycle T according to the obtained current linear velocity V<n> and the current frequency f<n> of the motor rotor; comparing the current rolling diameter calculated value D<n> with a predetermined limiting condition, and determining the current rolling diameter determined value; according to the current rolling diameter determined value, controlling a motor to output a corresponding force moment. According to the tension control method, device and system of the rolling and unrolling equipment, due to the fact that a tension controller calculates out the current rolling diameter calculated value by obtaining the material operation linear velocity, then conducts error judgment on the current rolling diameter calculated value obtained through calculation, conducts judgment by comparing the current rolling diameter calculated value with the limiting condition and finally controls a frequency converter to output the corresponding force moment according to the current rolling diameter determined value obtained through calculation and judgment, the material on the roller wheel can obtain constant tensile force all the time, the material can be rolled and unrolled more stably, and the rolling and unrolling effect is better.

Description

technical field [0001] The invention relates to the technical field of tension control, in particular to a tension control method, device and system for winding and unwinding equipment. Background technique [0002] In the case of tension control rewinding and unwinding where the diameter of the reel varies widely, in order to achieve constant tension control on the material surface and improve the forming effect of the material on the rewinding and unwinding side, it is necessary to know the diameter of the material on the rewinding and unwinding reel in real time. Among the existing roll diameter calculation methods, there is a method of directly measuring the roll diameter, and there is also a method of calculating the roll diameter according to the thickness of the material and the number of turns of the material on the rewinding and unwinding shaft. The cost increases, and there are errors in the measurement. However, it is difficult to accurately measure the thickness ...

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Problems solved by technology

Among the existing roll diameter calculation methods, there is a method of directly measuring the roll diameter, and there is also a method of calculating the roll diameter according to the thickness of the material and the number of turns of the material on the rewinding and unwinding shaft. The cost increases, and there are errors in the measurement. However, it is difficult to accurately measure the thickness of the material in the field application, or the thickness of the material will have a certain expansion and contraction change. Inaccurate

[0003] In order to overcome the above method of directly measuring and calculating the coil diameter, the publication number is CN103708268A discloses a coil diameter calculation method, the coil diameter is calculated by the coil diameter linear speed and the motor speed, and the other coil diameter is calculated by the compensation formula , and then compare the difference between the two roll diameters with the set value to determine whether the difference exceeds the preset set value. If it exceeds, the roll diameter calculated by the linear speed of the roll diameter and the motor speed will be compensated. If not The calculation of the coil diameter is based on the linear speed of the coil diameter and the motor speed. This method compensates the calculation error by comparing the artificially set value with the difference. However, the number of turns of the compensation formula in this method needs to be measured and needs to be Increase the measuring device, adding the measuring device will increase the possibility of error, and the set value set manually, also has errors if it is set entirely based on experience

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