This paper discusses different drive gear failures in coal mining equipment featuring high power, low speed, heavy-duty and small dimension, and proposes measures against them.

针对煤矿机械功率大、速度低、重载和相对尺寸小的特点，分析了煤矿机械传动齿轮的失效形式，提出了改进途径。

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Four Bearing Outboard Direct Drive Coupled Design? Heavy Duty Drive Coupling Assembly? Polyurethane Paint Finish? Heavy Gauge Steel Construction? Backward Curve Impellers.

四轴承外部直接驱动设计？重型，耦合驱动安装？聚氨酯漆处理？重型钢结构？反向驱动叶轮。

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Collapsible Coiler - Rotates on Large Ball Bearings? Power Drive Assembly or Hand Operated? Large Heavy Duty Casters? Floor Lock Brakes? Guide ring? Tool and Tag Tray.

可折叠，绕在大滚珠轴承上？电力驱动或手动？重型大脚轮？地面锁制动器？导向环？工具和配件存储盘。

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They thought it was wrong, but it turned out that they had been using a heavy-duty 18-wheeler to drive between loading docks all day.

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