The main hoist winch and a system of elevators lift 1,250 tons of pipes and machinery through the 72 inches wide hole at the bottom of the boat.
主起吊绞车和升降机系统可通过船底72英尺宽的洞，提升1，250吨重的管道和机械。
Derrick: the main hoist winch and a system of elevators lifts 1,250 tons of pipes and machinery through the 72.
钻塔：主起吊绞车和升降机系统可通过船底72英尺宽的开口，提升1,250吨重的管道和机械。
The improvement plan, work principles and reform result on electric control system of main shaft hoist in Linhuan Coal Mine are introduced, and the result is fine.
介绍了临涣煤矿主井提升机电控系统的改造方案、工作原理及改造效果，经过改造后的电控系统效果良好。
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