在工程机械中,如轮胎式起重机和轮胎式挖掘机,为了提高其工作性能,增加稳定性,均设有支腿油缸,挖掘机设有两个或四个支腿,而汽车起重机一般设有四个支腿,当起重机作业时,载荷及全车重量完全由四个支腿支撑,因此,要求支腿油缸坚固可靠,否则,会发生“软腿”,引起起重机倾翻。在维修中我们发现 QY8A 型蛙式支腿因活塞挡板弯曲变形发生“软腿”现象较多,如图1所示。日本多田野10吨液压汽车起重机也曾出现过。 In construction machinery, such as tire cranes and wheel excavators, in order to improve their work performance, increase stability, are equipped with outriggers, excavators have two or four legs, and truck cranes are generally equipped with The four outriggers, which are fully supported by four outriggers when the crane is in service, require that the outriggers be sturdy, otherwise “soft legs” may occur, causing the crane to tip over. In the repair we found that QY8A type frog leg due to piston baffle bending deformation occurs more “soft legs” phenomenon, as shown in Figure 1. Japan Teda 10 tons of hydraulic truck crane has appeared.