对0.3—2.5米~3各种挖掘机(如Э—302,Э—652,Э—2501)正鏟动臂应力进行研究与测量的結果表明,动臂損坏的主要原因之一是强度不夠馐且蛴嬎愣凼辈唤雒挥锌悸枪ぷ髯爸每赡艹d,而且也沒有考虑挖掘时的某些危险位置。如所周知,作用在动臂上的力,其大小决定于土壤的挖掘阻力和工作装置各构件的相互位置。如果切層的尺寸对該种机器是标准的,那么,挖掘工序将以原动机所发出的計算挖掘力进行。当鏟斗过分压入土壤时, The results of research and measurement on the shovel arm stress for various excavators ranging from 0.3 to 2.5 m~3 (eg Э-302, Э—652, Э—2501) indicate that one of the main causes of boom damage is insufficient strength. He also called for his father to use a zinc gun and dad for every d, and he did not consider certain dangerous positions during excavation. As is well known, the force acting on the boom is determined by the resistance of the soil to excavation and the mutual position of the components of the working device. If the size of the cut layer is standard for this type of machine, then the excavation process will be performed with the computational digging force of the prime mover. When the bucket is pushed into the soil too much,