新型后摇杆驱动四连杆变幅机构的传力特性与变幅力矩分析

摘要

在门座武起重机和浮式起重机中广泛采用四连杆机构,用来实现带载变幅,即工作性变幅.而一种新型四连杆变幅机构:后摇杆驱动、臂架活动范围大、外观和几何形态特别,重心高度低.这种新型四连杆变幅机构的浮式起重机已经在国外投入使用.运用机构学知识来分析该新型四连杆变幅机构的传力特性和变幅力矩,以一起重量为160 kN的实例计算,证明了该新型四连杆变幅机构具有优良的传力特性.%The double-link luff mechanism is in general use for portal slewing cranes and floating cranes. But, a new double-link luff mechanism with back-rocker driving come to light. There are great differences in outward appearance , geometric shape, luff performance between jib type crane with back-driving and normal double-link type crane. Based on theory of mechanism, transmission characteristic and luff moment of luff mechanism of jib type crane with back-rocker driving is studied. By sample (lifting capacity is 160 kN) analysis, the double-link luff mechanism with back-rocker driving has good transmission characteristic.