Research On The Key Control Technique Of The New Type And High Speed Loom

The textile industry is a pillar industry in the national economy and has the advantages of participating in international division of industries in China. As one part of equipment manufacturing industries, textile machinery receives popular concern. It is crucial in the "National 11th Five-Year Plan" period that textile industry changes from the big to the strong. Textile machinery industry in the "11th Five-Year Plan" period charged with the dual task. It not only need to meet the requirements of the upgrading of advanced technology and the equipments of textile industry, but also need to make itself strong through the rejuvenation of equipment manufacturing industry. As a mechanical and electrical integration of textile machinery in the highest level of technology typical of textile machinery, loom includes many common and key technologies of textile machinery. It is important to study the loom in details which acts as the carrier to improve the technology of Chinese textile machinery and other related fields. According to the actual needs of enterprises, theory and technology of tension control and start mark compensation, technology of digit of machine and multi-motor control on cooperation and stable and reliable real-time control system are studied, which are the key common techniques and meet the requirement of the development of the new high-speed loom.Electronic let-off and electronic take-up system of loom is studied at first. Tension control technology included is one of the common technologies exclusively used in the engineering industry such as textile and printing equipment etc. The mechanism of warp tension is analysed .Some kinetic models are discussed. All these give the theory support to study technology of the tension control and start mark.The warp system is nonlinearity, time-variability and multi-variable and it is coupling between tension and velocity of the warp. Tension is control through compound control method based on input compensation. Multi-variable feedforward and feedback structure are adopted. Its structure is not only feedforward. Fuzzy auto-adaptive arithmetic is adopted. Feedforward tension is controlled according to Variational diameter of warp beam, Variational weft density, Variational target tension and Variational speed of loom. Fuzzy auto-adaptive arithmetic tunes the parameter of controller automatically to settle the difficult problem of warp tension control system. Because of the adopted compound control method based on input compensation tension has higer response and precision and smaller overshoot. The stable precision is 1%. It can meet the need of high speed and precision of warp tension control. It settles the existent problems such as unstable washcloth quality in terry let-off control system of high level terry loom. Start marks is an important factor that leading to woven defects.The reasons of start mark are discussed. On the base of former research, the cloth fell displacement is main factor to produce start mark. The relation between cloth fell displacement and influencing reason is studied in theory. Intelligent start mark compensatory system based on fuzzy logic is also studied. The compensatory system can calculate the compensatory value of start mark according to yarn variety and count. This system makes settling start mark problem easier and finds a new way to deal with the start mark. The relation of compensatory system between warp break stop and weft break stop is also studied in theory. It settles the existent problem in manufacturing.Digit and high speed is the developmental requirement. The main driving based on digital servo technology is studied at the first in china. Digital Weft–selecting and Fabric selvedges are studied. Digital main driving, weft-selecting and Fabric selvedges are studied as whole based on multi-motor cooperation. And this improves the performance of them and loom level. Working principle and the control requirement of cooperative motion are analysed. The arithmetic on the cooperative motion is studied. The multi-motor control system on cooperative motion based on step motor is developed. And it meets the requirement of good quality, low cost and digital control as well as high speed.The distributed real-time control system based on universal CANopen protocol is developed. The control core is 32-bit DSP. The Information project of loom based on CANopen protocol is presented and studied. The distributed controllers can exchange data quickly among them. They also act as a network module to exchange data from outside. All hardware and software having property right are developed. They work well in factories. A lot of softwares are universal and flexible, which scarcely depend on the adopted hardware.The control system as the related research results has been used in three corporations. It is proved to be stable and reliable, functional and highly intelligent. Relevant control guidelines are effective. The multi-motor control system on cooperative motion based on step motor is able to meet the speed to 700 r/min of the loom. The electronic let-off and electronic take-up system and main control system are able to meet the speed to 1200 r/min of the loom. Therefore theycan all meet the speed to 600/min over of the new high-speed looms. The production is now in the promotion stage.