Carbon cloth tension automatic control device in low temperature carbonization furnace system

Abstract

The invention relates to an automatic carbon cloth tension controlling device in a carbon cloth low-temperature carbide furnace system used by a fuel battery in the automatic control field. The device comprises a potentiometer, an inlet frequency variation controller, an inlet driving roller, a tension controller, a tension roller, an outlet frequency variation controller and an outlet driving roller. The inlet driving roller is positioned in front of a low-temperature carbide furnace; the inlet frequency variation controller, the potentiometer and the inlet driving roller form a closed loop feedback chain; the tension roller and the outlet driving roller are sequentially positioned behind the low-temperature carbide furnace; the tension controller is respectively connected with the tension roller and the outlet frequency variation controller; and the outlet frequency variation controller is connected with the outlet driving roller to output the carbon cloth. A tension sensor in the invention measures and obtains an instant tension value of the carbon cloth and is controlled by a feedback closed loop so that the carbon cloth tension control achieves high accuracy, satisfactory stability and fast response. Manual adjustment of the potentiometer can stabilize the invention in a new and balanced feedback loop so as to perform fine adjustment to the carbon cloth of different materials and to facilitate technical operations.

Description

technical field [0001] The invention relates to an electromechanical automatic control device in the field of automatic control, in particular to a carbon cloth tension automatic control device in a fuel cell carbon cloth low-temperature carbonization furnace system. Background technique [0002] The tension of carbon cloth is a very important parameter in the low-temperature carbonization process of carbon cloth for fuel cells, which directly affects the strength of carbon cloth. The commonly used carbon fiber production process in the world is to pre-oxidize polyacrylonitrile fibers and then carbonize them at 1000-1500 ° C. If treated at a higher temperature, graphite fibers or graphitized carbon fibers can be obtained. At present, graphitized carbon fiber products are mainly imported from abroad. One of the keys to the production of graphitized carbon fiber is whether the special production equipment can meet the production process requirements. The existing improved pro...

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Problems solved by technology

[0005] After searching, it was found that the Chinese patent application of Mitsubishi Rayon Co., Ltd., titled: Acrylonitrile-based precursor fiber for carbon fiber and its preparation method, CN200410006862.1, application date 1999.07.22, publication date 2004.10.13, This technology discloses a method for preparing an acrylonitrile-based precursor fiber of carbon fiber. The disadvantage of this technology is that it must be heated and stretched through a roller for many times to increase the draw ratio of carbon fiber.

The above factors have seriously limited the development and application of graphitized fibers in my country.

[0007] There are obvious problems and deficiencies in the above-mentioned existing technologies. Since the carbon cloth will shrink with the escape of volatile matter in the low-temperature carbonization furnace, even if the above-mentioned three existing technologies are combined, the problem based on the no-overshoot PID algorithm cannot be solved. Technical Difficulties of Feedback Control Strategies

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