产品丧失设计规定的功能、通常称为失效。对可维修的矿山机械产品可以说发生了故障。产品的失效、不仅指致命性的破坏或完全丧失功能,也包括它的功能、特性降低到不满足规定的要求。因此判断产品的失效 Product loss of design features, often referred to as failure. It can be said that a breakdown has occurred in repairable mine machinery products. Product failure, not only refers to the fatal destruction or complete loss of function, but also its function, characteristics reduced to not meet the required requirements. So judge the product’s failure