Setting method of deceleration point of integrated backup protection device of hoist

The paper gave rough formula of distance between deceleration point of integrated backup protection device of hoist and stop point, and calculation formulas of safe braking distance between a section or a point and stop point, safe braking distance of continual over speed judgment between a section or a point and stop point, and safe braking distance of continual over speed judgment between deceleration point and stop point successively. The point which is away pithead with the safe braking distance of continual over speed judgment between deceleration point and stop point is set as deceleration point. The setting method of deceleration point is fit for setting deceleration point of backup protection when deceleration point of electrical control system of hoist adjusts automatically according to loads. The application shows that deceleration point set by the method can ensure hoisting container stop under pithead safely when deceleration point of electrical control system of hoist loses efficacy with high reliability.