卡杆现象是穿孔设备常见的故障之一，是影响液压凿岩钻机高效率、高质量穿孔的重要原因。

The sticking steel is one common trouble of drilling equipment and an important cause effecting the high efficiency and high quality drilling of hydraulic drill.

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文章分析了导致设备出现故障的几种液压设计缺陷，并提出了改进方案。

This paper analyzed some hydraulic pressure design defects that cause the equipment breakdown, and proposed the improvement program.

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任何工程机械式液压设备使用时出现故障是不可避免的。

At the usage of any engineering machine type hydraulic equipments, meeting some malfunction is ineluctable.

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