The Study Of PLC Control System In 400 Continuous Extrusion Machine

Continuous extrusion technology was invented by the English Springfield's lab in 1971. Because of the technology; it is main used to produce aluminium production at first. In the late 1990's, the technology of copper continuous extrusion has a breakthrough. The British BWE cable company took the lead in accomplishing the research of the copper continuous extrusion device. The Continuous Extrusion Engineering Research Center (CEERC) of Dalian Railway Institute has being track in this advanced technique continuously, and in domestic took the lead in 2004 successfully to develop the TLJ400 Continuous Extrusion Machine which was the first TLJ400 Extrusion/Cladding production in China.Programmable Logic Controller (PLC) only has 30 years from produces to the present, but because it appears some excellences in the industrial control domain with high-density, small volume, large capacity, high velocity, usability and high performance, which receives widespread attention and research. Now the technology about PLC industrial control has been widespread applied.As the development of the continuous extrusion machine's technique, the TLJ400 continuous extruder has been sold to many foreign places now. Machines in the overseas use the industry control computer or the long-distance monitoring in controlling and surveillance, in order to complete control and parameter surveillance, Besides, in data acquisition and memory aspect, Because we collect and memorize data with monitoring software at present: King View software, which cannot browse without King View software of computer,thus,wo cannot long range monitor and derive data.In paper, data acquisition and memory is based on Access Database and ODBC Data Source technology, successfully realizes connecting Access Database and ADO Data Source in VB, and compile computer program which realized communication and data acquisition between PLC and computer with VB. compile PLC program which realized communication and data acquisition between PLC and computer with STEP7-Micro/WIN 4.0.Result shows chear: it has high speed and real-time nature, and can browse ,edit and memory in computer without King View software.In the control of the principal axis rotate speed, we increasing PLC program include input quantity fuzzification,establish and polling Fuzzy Rule List, output quantity distinction, parameter adjustable PID. Finally make use of MatlabSimulink toolbox to simulate the Fuzzy-PID control system. The result of the simulation indicated that the system has fast response speed, high adjustment precision, well steady-state behaviour,less overshoot and oscillation than PID control, less short adjustment time than Fuzzy control, better robust.