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仪征化纤公司涤纶一厂80年代从德国吉玛公司引进了3条聚脂生产线,每条生产线的最终缩聚反应器的真空系统中都有3组换热器。每组换热器的封头共有M24六角头螺栓120只。换热器必须定期进行人工清洗,清洗工作量很大,一般每组换热器拆装封头螺栓并清洗一次需3个熟练工人工作6小时。为缩短清洗时间和减轻工人劳动强度,我们从1995年起就使用M24快速拆装螺栓,见图1。
Yizheng Chemical Fiber Company, a polyester plant in the 1980s from Germany’s Gemma company introduced three polyester production line, each line of the final polycondensation reactor vacuum system has three heat exchangers. The head of each group of heat exchangers a total of M24 hex head bolts 120. Heat exchangers must be regularly carried out manual cleaning, cleaning a lot of work, the general removal of head bolts and heat exchanger for each group takes 3 skilled workers for 6 hours. To reduce cleaning time and labor intensity, we have been using M24 quick-disconnect bolts since 1995, see Figure 1.