Wool warp yarn continuous tension adjusting method without displacement sensor

Abstract

The invention relates to a wool warp yarn continuous tension adjusting method without a displacement sensor. The wool warp yarn continuous tension adjusting method comprises the following steps that (1) the initial position of a pressing roller is determined through a limiting switch; (2) a servo motor is controlled in a fixed torque mode to drive the pressing roller to load pressure to the fed wool warp yarn from the position between two rolling bearings; (3) a rotation angle is determined according to a coding disc of the servo motor, and the real tension in the wool warp yarn is calculated by a controller based on the following information: the rotation angle alpha, the radius r of the pressing roller, the length l of a pressing roller connecting rod, and the spatial position coordinates (xa, ya) and (xb, yb) of a servo motor shaft O and the two rolling bearings with yarn contact points A and B; and (4) the torque output of the servo motor is adjusted by comparing the difference between the target tension and the real tension, the rotation angle of the servo motor is recorded, and continuous adjustment of the tension of the wool warp is achieved through real-time calculation. A displacement sensor does not need to be installed on the pressing roller, and continuous adjustment of the tension of the wool warp is completed only through the servo motor.

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 realization principle is as follows: whil...

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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