What is the meaning of the main volume and the vice roll in hoisting machine
A pair of ups is the group that has a smaller weight. The general model is: qd16/5-16.5, etc.
It is the main hook of the crane and the little hooks.I hope my answer will help you..
Generally speaking, it is aimed at the crane that has the main and the two pairs of hooks, which means the main lifting mechanism, the group that is heavier
