The application discloses a
servo drive hydraulic grab bucket
system and grab bucket for a large crane and belongs to the technical field of cranes. The
servo drive hydraulic grab bucket
system for the large crane comprises an
oil tank for storing hydraulic oil and a
hydraulic control system, the
oil tank is communicated with the
hydraulic control system through a hydraulic pipeline and forms a closed circulating oil path, and the
hydraulic control system comprises: a
hydraulic cylinder body connected with the grab bucket; a
hydraulic pump group composed of a constant-power variable pump driven by a
servo motor, an oil inlet of the
hydraulic pump group being connected with the
oil tank through the hydraulic pipeline and an oil outlet of the
hydraulic pump group being connected with a hydraulic
pump head valve group; and the hydraulic
pump head valve group comprising an electromagnetic
ball valve, an input end of the electromagnetic
ball valve being connected with an output end of the hydraulic pump group and an output end of the electromagnetic
ball valve being connected with an oil inlet of a control valve group. The
servo drive hydraulic system is utilized to realize linear and continuous change of the working speed of the super-large grab bucket through double-variable control, and the stability,
working life and working efficiency of the working system are effectively improved.