... drive hook unit up or down. Lifting height H = 6m, when Crane capacity <10t, we should use a elastic ... rope mess aroundWhen H ≥ 9m, crane ≤ 10t; H ≥ 6m, weight ≥ 12.5t, we should add an intermediate shaft and ... .When H ≥ 9m, from the weight ≤ 10t; H ≥ 6m, when equipped with a crane ≥ 12.5t, we should add ... has conical rotor, the brake part has a ring plane and smaller brake torque. It is slow in braking ...