(1)原下动臂结构的不足某型挖掘机在最初设计时为了确保高速行驶的技术指标,采用了由下动臂、上动臂和斗杆3节臂组合的工作装置。把传统的整体式动臂改为由下动臂和上动臂铰接而成的折叠式动臂,上动臂和下动臂通过伸缩液压缸进行折叠和打开。行驶时将下动臂和上动臂折叠起来放在机架上,降低了重心,能够保证高速稳定行驶且驾驶 (1) Inadequacies in the structure of the original lower boom In the first design of an excavator to ensure high-speed running technical indicators, the use of the lower boom, boom and arm 3-arm combination of working equipment. The traditional one-booms to the lower boom and the upper boom articulated the folding boom, the upper boom and lower boom through the telescopic cylinder to fold and open. Driving the lower boom and upper boom folded on the rack, reducing the center of gravity, to ensure stable driving at high speed and driving