The main beam is the main hoist gantry crane force components, main beam directly affects the service life of machine.
主梁是葫芦门式起重机的主要受力部件，主梁的质量直接影响到整机的使用寿命。
Improving the surface properties of material is an important method that prolongs service life of machine parts and brings out latent potentialities of materials.
提高材料的表面性能是延长机器零件的使用寿命和发挥材料潜力的重要途径。
Based on the theory of fracture mechanics, the calculation of the residual life of machine parts, along with its practical implementation and precautions are stated.
叙述了以断裂力学理论为基础的对设备零部件剩余寿命进行预测的计算方法，指出了工程实际中的实施方法及应该注意之处。
Fully automatic lubricating system can assure smooth operation, as well as long life of parts and long life of machine;
全自动加油循环系统，能有效降低零件的损耗，延长机器寿命，运转时平顺无噪音；
Fully automatic lubricating system can assure smooth operation, as well as long life of parts and long life of machine;
全自动加油循环系统，能有效降低零件的损耗，延长机器寿命，运转时平顺无噪音；
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