Effect of drum structure of mine hoist on multilayer winding and multipoint lifting ropes’ discordance

The ultra-deep mine hoist is used in deep mining. To ensure ropes’ synchronization under multipoint lifting and multilayer winding conditions,the causes of ropes’ discordance were studied and the effective scheme was pro- posed for reducing the discordant value perspective from the hoist drum’s structure. The coupling deformation model of ropes and drum during winding between cycles and layers was built,then the load condition on the drum during lifting process was obtained. Finite element method was utilized to compute the drum’s deformation,and obtained the varia- tion curve of ropes discordant value. The results show that the drum’s structure has a great influence on ropes’ syn- chronization,and the coupling deformation on drum and ropes will cause ropes’ discordance. If under an improper control,the tension difference between ropes will exceed,which causes ropes unsafe. Through optimizing the support structure,the drum’s stiffness was improved and the ropes discordant value was decreased significantly. The study has theoretical and applied values for the design of drum’s structure for ensuring ropes’ synchronization under multipoint lifting and multilayer winding conditions.