This paper introduces an optimal method for designing the weight-balance system of the four-link luffing mechanism.

本文介绍了一种四连杆变幅机构平衡重系统的优化设计方法。

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Portal crane sub frame and four-link arm two types, from the crane hoisting, luffing, slewing and walking four agencies ac frequency control, the machine USES PLC control, superior performance.

门座式起重机分单臂架和四连杆两种类型，起重机的起升、变幅、回转和行走四大机构均采用交流变频调速，整机采用PLC控制，使用性能优越。

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