Methods for adjusting the braking force of winders with a traction sheave to prevent the risk of wire rope slippage

Abstract

In Koeppe winders, the emergency braking deceleration values must be higher than the values required by mining regulations and lower than the critical deceleration values due to the risk of hoisting rope slippage. Slippage of suspension ropes can lead to damage to the traction sheave lining and, in extreme conditions, serious damage to the shaft hoist. In order to limit the braking force to a safe value, the air or hydraulic oil pressure in the braking systems of winders is regulated during braking. This paper presents methods for adjusting pressure in braking systems during braking and their influence on: the risk of slippage of the suspension ropes, the dynamics of the driving system and the dynamics of the skips themselves. Particular attention was paid to the solution in which the braking force varies during the braking process which can cause large changes in the value of the force acting on the winder.