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The stable operation of heavy duty mining truck is beneficial to safe production of mines. The failure rate of heavy duty mining truck in a mine is high and it is even higher in winter. It is found through analysis that the main causes are structural designs of accumulator and steering pump themselves for hydraulic system are not reasonable as well as control of mixture ratio of fuel to oil for engine is not accurate. The seal wear is reduced through changing single-point support to oriented multi-point support for piston of accumulator and adding unload groove; such problems as high pressure and temperature rise are solved as well as loss of parts is reduced through adding unloading valve on steering pump; temperatures of solidification point for different mixing ratios of 0^# and -35^# diesel are determined through experiments as well as auxiliary fuel tank is installed to choose different mixture ratios of fuel to oil and oil supply modes based on weather conditions. The failure rate of heavy duty mining truck is reduced through implementing the above measures.

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矿用重型汽车的稳定运行有益于矿山安全生产。某矿山的矿用重型汽车故障高发,且在冬季的时候更严重。分析发现,液压系统的储能器和转向泵自身结构设计不合理,以及发动机燃油混合比例控制不精确是主要原因。将储能器活塞单点式支撑改为导向式多点支撑,同时增加卸荷槽,减少密封磨损;转向泵增加卸荷阀,解决了高压与温升问题,减少部件损耗;通过试验确定了0^#和-35^#柴油不同混合比例的凝点温度,加装副油箱,根据天气状况选择不同混合比例的燃油和供油模式。以上措施的实施,降低了矿用重型汽车的故障率。

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慕园园(1986-),男,陕西省榆林市人,硕士,高级工程师,现从事安全技术管理工作。

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慕园园(1986-),男,陕西省榆林市人,硕士,高级工程师,现从事安全技术管理工作。

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