一、机械设备载荷的计算任务 采煤机械设备承载过程,既决定着机械设备的极限破坏参数、速度,最终又决定着机械设备的生产率。因此,在设计阶段,为了保证采煤机械设备具有必要的可靠性指标,正确地选择计算载荷,正确地计算机械零件强度和寿命具有很重要的意义,这可以客观地评价所采用的设计方案与工艺措施的必要性与合理性,因为计算结果决定着下述指标:装备功率,金属耗用量、成本等。所有这一切在设计阶段同样也需要在能引起故障的不同极限状态范围内保证采煤机械设备零件具有必要的耐久性。因此,按照塑性积脆性破坏、低周期和高周期疲劳破坏,特别重要的是正确评价极限状态。但是,由于在使用载荷作用下(在一次过载、磨损等丧 First, the calculation of mechanical equipment load Coal mining machinery bearing process, not only determines the ultimate destruction of mechanical equipment parameters, speed, and ultimately determine the productivity of machinery and equipment. Therefore, in the design stage, in order to ensure that coal mining machinery and equipment with the necessary reliability indicators, the correct choice of load calculation, the correct calculation of mechanical strength and life of parts of great significance, which can objectively evaluate the design used and The necessity and rationality of technological measures, because the calculation results determine the following indicators: equipment power, metal consumption, cost and so on. All this at the design stage also requires the necessary durability of the coal mining equipment components within the limits of the different fault conditions that can cause the failure. Therefore, in the light of brittle fracture of plasticity, low-cycle and high-cycle fatigue damage, it is particularly important to correctly evaluate the limit state. However, due to the use of load (in an overload, wear and tear funeral