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。
Safety brakes have been used at low speed shaft of ladle cranes, especially of those with planet gear boxes. Safety brakes protect the main hoist effectively.
铸造起重机(特别是采用行星减速机者)在卷筒端低速轴上安装安全制动器，对起升机构起到有效的安全保护作用。
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