Since the fact that the work condition under the shaft in coal mine is comparatively odiously , electric motor block rate is particularly tall.
由于煤矿井下的工作条件比较恶劣，电动机的故障率特别高。
Said invention has good effect for preventing coal block from being broken, and its coal block breaking rate is low.
本发明防止煤块破碎效果好，破碎率低，且具有圆形立仓的防堵塞作用。
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