Dead zone length automatic detection method in auto-levelling control for drawing frame

Abstract

The invention relates to a dead zone length automatic detection method in auto-levelling control for a drawing frame. The dead length for the drawing fame is determined according to the delayed tooth number of a control period relative to a feeding period. A recommended dead zone length for the drawing frame having the corresponding model is set as the reference, and a measurement interval is obtained by adding a set length to the reference or reducing the set length from the reference. During an operation process of the drawing frame, values within the measurement interval are input to a control module, CV% values corresponding to the values within the measurement interval are calculated through the control module in the drawing frame, and the value within the measurement interval and corresponding to the minimum CV% value is employed as the optimum dead zone length. According to the invention, the optimum dead zone length for the drawing frame can be automatically found, so that control errors due to speed fluctuation can be avoided, the auto-levelling control can be more accurate, and therefore the working efficiency is improved.

Description

technical field [0001] The invention relates to a method for automatically detecting the length of a dead zone in the autoleveling control of a draw frame, and belongs to the technical field of draw frame control. Background technique [0002] The draw frame is mainly used in the processing technology of cotton and chemical fiber textiles. Through the processes of merging, drafting, mixing and slivering, a uniform slivers can be made, and several fibers can be processed into slivers with certain quality requirements. fiber strips. In order to improve the level of textile processing technology, the existing draw frame adopts autoleveling technology for control. The autoleveling technology belongs to the open-loop control system, which realizes the automatic and effective online detection of the unevenness of the fed sliver, and can adjust the draft ratio in time to control the quality of the sliver. During the operation of the draw frame, there will be a dead zone length be...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art, and propose an automatic detection method for the length of the dead zone in the autoleveling control of the draw frame, which solves the problem in the prior art that the accuracy of the autoleveling is not high due to the influence of the fluctuation of the vehicle speed. question

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