单滚筒式的热效率低生产能力小。
Single drum type of low thermal efficiency and low production capacity.
滚筒法：有双滚筒和单滚筒两面种。
1 roller method: there are two kinds of roller and single drum.
针对交流双滚筒单绳缠绕式提升机在多水平运行时，中间水平没有电气制动的问题，提出改造方案。
Directing to the problem of ac double-drum single rope winding lifter working in multiple level without electric brake in middle level, put forward the reform plan.
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