Wippwerk (Neutrum)

Description: Luffing gear is used to change the angle of incline of a jib (e.g. of a crane) and thus its reach. Compared to derricking gear, luffing Gear is faster, although the primary source of loading for both - as in the case of Lifting gear - is weight, i.e. the combined weight of the object being lifted and the dead weight of the jib. Cable, rack-and-pinion, hydraulic and spindle drives are used in luffing gear to raise and lower the jib. The guidance systems for the jib and lifting cable are designed so that the trajectory of the load stays as horizontal as possible as the reach of the jib changes (vertical travel compensation). The mass of the jib is largely offset by counterweights on the jib, cable or rocker arm or parallelogram connecting rods. Cable pulleys, block and tackle systems, cable rigging, double link designs and horse-head jibs are used to compensate for vertical travel.

Description: 变幅机构 通过改变吊臂倾斜角度（比如起重机的）从而达到变幅目的。尽管对于提升机构而言，最主要的负载其实是自重，比如起吊物体和吊臂的重量，但是相比于别的变幅机构 (Derricking Gear)，此变幅机构速度更快。 变幅机构通过缆索、齿轮齿条、液压部件和主轴驱动来升降吊臂。经过特殊设计的吊臂导引系统和升降索，通过不断改变吊臂作业范围（ 垂直行程补偿），确保负载可以在尽可能水平的轨迹上运行。吊臂的质量很大程度上被吊臂的配置，缆索，摇臂和平行四边形连杆的质量抵消了。 缆索滑轮，滑轮系统，缆索传动装置，双连杆设计和马头型吊臂综合作用，补偿垂直行程。 变幅回转起重机 近义词 变幅机构 垂直行程补偿