1引言随着现代科技的高速发展,升降机是各厂矿、企业、医院、航空、航海等不可缺少的货物运载工具。现将本人设计的一套简易控制电路作一简要介绍。仅供工程技术人员作参考。2系统设计2.1设计要求SJ1、SJ2为上限常闭触点开关;SJ3、SJ4为下限常闭触点开关;AN1、AN3为常开点动按 1 Introduction With the rapid development of modern science and technology, lifts are indispensable means of delivery of goods by factories, mines, enterprises, hospitals, aviation and navigation. Now I designed a simple control circuit for a brief introduction. For engineering and technical personnel for reference only. 2 System Design 2.1 Design Requirements SJ1, SJ2 for the upper limit normally closed contact switch; SJ3, SJ4 for the lower limit normally closed contact switch; AN1, AN3 for the normally open point press