The invention provides a design method for hinge points of a pullshovel working device of a monobucket hydraulic
excavator and belongs to the technical field of monobucket hydraulic excavators. The design method for a
hinge point (B) of a movable arm oil cylinder and a movable arm and a
hinge point (F) of the movable arm and a bucket rod is characterized by comprising the following steps of: 1, selecting the size and the
pose of the working device of an original
excavator; 2, establishing a mechanism model; 3, enabling the movable arm oil cylinder to be equivalent to an equal-
diameter rod during full shrinkage; 4, establishing a mechanism elastokinetics model; 5, establishing a
system quality matrix and a
stiffness matrix; 6, establishing constraints; 7, performing optimum design on the
hinge point B; and 8, performing optimum design on the hinge point F. According to the method provided by the invention, the hinge points are designed through calculating the maximal hinge point position at
natural frequency of the pullshovel working device by utilizing a
particle swarm optimization intelligent
algorithm, so that the method provided by the invention has the advantages of short design period, high
programming degree, systematically improved dynamic characteristic of the pullshovel working device, and the like.