A method for continuously adjusting wool warp tension without displacement sensor

Abstract

The invention relates to a method for adjusting the continuous tension of wool warp yarns without a displacement sensor, comprising the following steps: 1) using a limit switch to determine the initial position of the pressure roller; Load pressure between the rolling bearings to the fed wool warp yarn; 3), determine the rotation angle according to the encoder disc of the servo motor, and the controller is based on the following information: rotation angle α, pressure roller radius r, pressure roller connecting rod length l, servo motor shaft O and two rolling bearings and yarn contact points A and B space position coordinates (x a ,y a ) and (x b ,y b ), calculate the real tension in the wool warp; 4), adjust the torque output of the servo motor by comparing the gap between the target tension and the real tension, record the rotation angle of the servo motor, and realize the wool warp tension through real-time calculation continuous adjustment. The invention does not need to install a displacement sensor on the pressure roller, and only uses a servo motor to complete the continuous adjustment of the wool warp yarn tension.

Description

【Technical field】 [0001] The invention relates to a method for adjusting yarn tension, in particular to a method for continuously adjusting wool warp tension without a displacement sensor, and belongs to the technical field of textile machinery. 【Background technique】 [0002] The warp system of the towel loom is divided into the wool warp and the ground warp. The core requirements of the raising action are: 1) At the proposed raising position, by changing the position of the weaving fell, a section of floating yarn with warp / weft yarns not interlaced is formed, and then changing the weaving fell Next, weave several wefts according to the normal process to form a temporary weaving section; 2) Then by restoring the weaving fell, the fabric is fluffed, that is, the ground warp yarn is drawn out, and the wool warp yarn is kept in the temporary weaving section, and the weaving section is pushed to the The intended fluffing position. The principle of its realization is as follow...

AI Technical Summary

Problems solved by technology

In this solution, since the servo motor works in the torque control mode, it can only adjust the yarn tension, so the current position of the pressure roller cannot be fed back. Therefore, it is necessary to cooperate with the pressure roller position sensor to perform the warp let-off action

There are two main problems in this design: 1) the use of a displacement sensor with analog output is expensive; 2) during the weaving process, the yarn tension is disturbed by the high-frequency disturbance of structures such as openings. The impact is particularly obvious, affecting the controllability of the pile height, thereby significantly reducing the quality of the towel fabric

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