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

An autoleveling and automatic detection technology, which is applied in the direction of textiles and papermaking, can solve the problems of low autoleveling accuracy, achieve the effects of avoiding errors, improving work efficiency, and realizing precise control

Active Publication Date: 2016-04-06
LUOYANG INST OF ELECTRO OPTICAL EQUIP OF AVIC
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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 c

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

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[0012] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0013] Automatic detection method of dead zone length in autoleveling control of draw frame. The invention adopts a fixed-length method to determine the length of the dead zone: the control module in the draw frame takes the number of teeth of the transmission teeth as the unit of measurement, and the control cycle is delayed by N teeth relative to the feeding cycle, and the delayed N teeth are used as the dead zone. length.

[0014] On the basis of ensuring the stability of the dead zone length, in order to ensure the accuracy of the autoleveling, the drawing frame can automatically determine the optimal dead zone length. The specific method is as follows:

[0015] Different types of draw frames have their own fixed mechanical distance, which is the recommended dead zone length of the draw frame. Increase or decrease a certain length before a...

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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...

Claims

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Application Information

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IPC IPC(8): D01H13/32
CPCD01H13/32
Inventor 张云珠张新宇黄巍华李宇雷
Owner LUOYANG INST OF ELECTRO OPTICAL EQUIP OF AVIC
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