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一、前言我厂于1989年建成了一台40吨(24.8米~2)台车式微机控制热处理炉,由于该炉在结构上采用了全纤维炉衬、高速调温烧噍、炉体全密封、烧嘴上下排布置、空气预热器等一系列先进技术,并采用了由DJK/F—1000—D多功能微型机控制装置和后备仪表组成的热工测控系统,经一年运行,生产了调质等热处理工件2000余吨,运行热效率达34.4％,为车间增加经济效益18万元。但是在该炉运行初期,炉内温度场的均匀性(由上、下、左、右8支热电偶测定),达不到设计要求的±7℃以内,而常在±10℃以上。如何攻克这一难关,进一步提高计算机自动控制系统的控温精度,笔者认真学习了控制理论并分析研究了炉子自控系统
I. Preface Our factory built a 40t (24.8m ~ 2) trolley-type microcomputer controlled heat treatment furnace in 1989. Since the furnace is equipped with full fiber lining, high temperature tempering, full sealed furnace , Burner up and down arrangement, air preheater and a series of advanced technology, and used by the DJK / F-1000-D multi-functional microcomputer control devices and backup instrumentation thermal control system consisting of a year of operation, production The quenching and tempering and other heat treatment of more than 2,000 tons of workpieces, thermal efficiency of 34.4% operation for the workshop to increase economic efficiency of 180,000 yuan. However, in the initial operation of the furnace, the uniformity of the temperature field in the furnace (measured by the upper, lower, left and right 8 thermocouples) can not meet the design requirements of ± 7 ℃, but often ± 10 ℃ above. How to overcome this difficulty and further improve the temperature control accuracy of the computer automatic control system, I carefully studied the control theory and analysis of the furnace automatic control system