Accurate control method for yarn tension

Abstract

The invention relates to an accurate control method for yarn tension. In the method, a brake is additionally arranged based on an original brake so that the yarn tension is controlled by two brakes, wherein the brake with a relatively large torque provides pre-applied tension for the yarn, and the other brake with a relatively small torque adjusts the variation of tension on yarn according to a control signal of a yarn tension detection control device so that the yarn tension can be stably kept within a relatively small variation range, the yarn breakage phenomenon is prevented during the high-speed operation of a weaving machine, and the stable operation of the weaving machine is guaranteed.

Description

technical field [0001] The invention relates to the application technical field of loom yarn tension control, in particular to a method for precisely controlling yarn tension. Background technique [0002] The on-line control of the tension on the warp thread during the weaving process of the loom is to ensure that the tension on the warp thread is maintained within a reasonable range when the warp thread swings up and down with the warp distributing rod, so as to avoid the occurrence of broken threads. [0003] At present, a brake is generally used to control the tension on the warp on the loom, and there are very few looms that use a brake to control the tension. Now, with the rapid development and perfection of electrical technology, computer technology and control theory, the rapid development of looms has been promoted. The development trend of new looms is to develop in the direction of high speed, high quality and high reliability. The motion system is electronically...

AI Technical Summary

Problems solved by technology

At this time, for those looms that use brakes to control warp tension, they cannot meet the development requirements of modern new looms, because there are two disadvantages in controlling tension by using brakes: first, it cannot achieve tension precise control, which will cause the loom to run unstable

Second, it lacks sensitivity and poor response characteristics, which cannot meet the high-speed development requirements of looms.

[0007] However, with the continuous development of new looms, the control system will gradually develop in the direction of digitalization, intelligence and networking. At this time, it is difficult for a single brake control to meet the high requirements of the system.

First, the brake first needs to provide pre-tension to the yarn, which requires the brake to provide a certain torque at the beginning. Therefore, when the tension on the yarn changes slightly, the controller cannot perform small control. At this time, the accuracy is limited. will fall

Second, because a brake cannot adjust to small tension changes in time, it can only respond when the tension changes reach a certain value, which will reduce the response characteristics of the system tension control

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