The device can realize the automatic and continuous telescopic motion of the suspension arm of the crane only by flipping one switch.
本实用新型只需扳动一个开关，起重机吊臂的 伸缩动作可自动连续完成。
Aiming at the shortage of conventional overhead travelling crane control system, the application of a novel control and protective switch in innovation for overhead travelling crane was introduced.
针对传统天车控制系统的不足，介绍了一种新型控制与保护开关在天车改造中的应用。
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