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1.故障现象1台由履带起重机改装的强夯机,由于长期承受冲击载荷,其回转平台主梁发生断裂。该强夯机回转平台主梁为工字型断面,断裂部位发生在回转支撑后方与变幅机构支撑座之间,裂纹由回转平台主梁上表面向下延伸,如图1所示。2.原因分析从强夯机回转平台受力分析可以看出,夯锤提升时,变幅机构对回转平台中部产生向上的弯矩;夯锤释放时,回
1. Symptom 1 by the crawler crane modified tamping machine, due to long-term impact load, the slewing platform main girder rupture. The boom of the tamper rotary platform is a cross section of the I-shaped section, the fracture site occurs between the back of the slewing support and the support of the luffing mechanism, and the crack extends downwards from the upper surface of the main beam of the slewing platform as shown in FIG. 1. 2. Analysis of the reasons From the dynamic analysis of the dynamic platform of the tamping machine, it can be seen that when the rammer is raised, the luffing mechanism generates an upward bending moment on the middle of the rotating platform; when the rammer is released,