合理布置连杆机构铰点位置是单斗液压挖掘机工作装置设计的一个主要内容。鉴于中小型液压挖掘机多采用定量液压系统,而反铲又是其主要工作装置,本文将专门研究定量系统反铲装置连杆机构的设计问题。由图1可见,反铲装置由动臂、斗杆和铲斗三大机构(均属平面连杆机构)组成。其作用是根据机构传力比随运动位置变化的特点,使主动件(工作油缸)发出的恒定推力适应从动件上随运动位置变化的外载荷的要求。因此,这类平面机构的尺度综合是一个典型的机构动力学问题。由于连杆机构的传力比非线性 Reasonably arranging the hinge position of the linkage mechanism is a main content of the design of the working device of the single bucket hydraulic excavator. In view of the large number of hydraulic systems used in small and medium-sized hydraulic excavators, and the backhoe is the main working device, this article will specifically study the design problems of the link mechanism of the quantitative system backhoe device. As can be seen from FIG. 1 , the backhoe device is composed of three mechanisms of a boom, an arm, and a bucket (all of which are plane link mechanisms). Its function is to make the constant thrust generated by the active part (working cylinder) adapt to the external load requirement of the follower on the basis of the characteristics of the transmission force ratio of the mechanism changing with the movement position. Therefore, the scale synthesis of such planar mechanisms is a typical mechanism dynamics problem. Due to the non-linear transmission force of the linkage