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现代采煤机的牵引和截煤部广泛采用了■压传动和控制,液压系统的工作可靠性直接影响到回采工作面生产任务的完成。据一些矿井反映,采煤机的各种故障中液压系统故障约占30％～50％,而且处理故障的时间长,维修工作困难,费用较高。这些故障发生的原因是多方面的,其中液压油的污染是一个主要原因。根据摩擦磨损理论:凡流体润滑的运动付中,当润滑油中混有的固体颗粒接近或大于油膜厚度时,就会在接触面上造成应力集中或表面划伤,甚至发热卡死。
Modern shearer traction and intercepting unit widely used ■ pressure transmission and control, hydraulic system reliability directly affects the completion of the production task of mining face. According to some mines, the failure of the hydraulic system in various failures of shearer accounts for about 30% ~ 50%, and the time for handling faults is long, and the maintenance work is difficult and the cost is high. The causes of these failures are manifold and the contamination of hydraulic oil is a major cause. According to the theory of friction and wear: Where the lubrication of the fluid is paid, when the solid particles mixed in the lubricating oil are close to or greater than the thickness of the oil film, stress concentration or surface scratches will be caused on the contact surface, and even heat stuck.