Compared with the traditional mine hoisting equipment introduced in the previous section, the ultra deep mine hoisting equipment has some unique characteristics. The ultra deep mine hoisting equipment needs to face the challenges of well depth of more than 15oom, hoisting load of more than 140t and hoisting speed much higher than the existing hoist. In order to realize the effective development and utilization of deep resources, it is necessary to carry out in-depth research on ultra deep well hoisting equipment in order to master its design and manufacturing method and safe operation theory.<br>As described in the previous section, single rope winding hoisting equipment is difficult to meet the needs of ultra deep well hoisting due to its wire rope diameter and huge hoisting equipment; The multi rope friction hoisting equipment can not meet the needs of ultra deep well hoisting because of the excessive fluctuation of the internal stress amplitude of the steel rope. Therefore, it is necessary to propose new and effective lifting forms to meet the needs of ultra deep well lifting. Scholars at home and abroad have done some research on this. The research results show that the multi-point lifting combination topology of multi-layer winding of multi wire rope is an effective form to realize the lifting of ultra deep wells. Ma chongxiang proposed that multi rope lifting equipment is the solution based on the in-depth study of multi rope friction hoist<br>An important way to solve the problem of 2500 to 3000m deep wells. Qu Dongting, Liang Lijuan, Liu Jinjun and others believe that the lifting depth can not be increased by increasing the diameter of the steel wire rope, and the limit lifting depth can be increased by appropriately reducing the safety factor of the steel wire rope, which provides an important reference for the realization of the lifting system of ultra deep wells.<br>
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