某厂供水装置滤池上采用往复桥式起重机将滤池底部的淤泥吸走,共有16台这样的桥式起重机。每台桥式起重机上安装有2台驱动桥式起重机运动的行走电动机,1台潜水泵,1块电接点真空压力表,1只控制空气管道通断电磁阀,4个检测桥式起重机运动到头的行程开关。这些设备必须按照一定的顺序依次或同时工作,才能使整个桥式起重机完成预定的任务。 A plant water supply device on the filter with a reciprocating overhead crane suction filter sludge at the bottom, a total of 16 such overhead cranes. Each overhead traveling crane is equipped with two traveling motors driving a traveling crane crane, a submersible pump, a vacuum pressure gauge for the electric contact, a solenoid valve for controlling the air pipe, and four detecting overhead traveling cranes The travel switch. These devices must be in a certain order or at the same time work in order to make the entire crane to complete the scheduled task.