Discrete limited variable-speed input multiple-freedom-degree controllable mechanism type excavator

A discrete limited variable-speed input multiple-freedom-degree controllable mechanism type excavator comprises a multiple-freedom-degree connecting rod mechanism, an internal combustion engine and a transmission device, is driven by the internal combustion engine. The internal combustion engine distributes power to driving rods of the multiple-freedom-degree connecting rod mechanism through the transmission device, and a state of constant-speed driving of the driving rods and a state that some driving rods are static and other driving rods performs driving at constant speed can be achieved through manual operation of a clutch device and a reserving device in the transmission device. Mutual matched movement of a moving arm lifting branch chain, a bucket rod swing branch chain and a bucket overturning branch chain is achieved under the matching effect of several driving rod driving states, transformable complicated movement trails of a bucket can be achieved according to the intention of a user, and various complicated excavating operations are finished. The discrete limited variable-speed input multiple-freedom-degree controllable mechanism type excavator overcomes the shortcoming that a hydraulic excavator is high in hydraulic element manufacture cost and complicated in maintenance, avoids power limitation suffered by the driving rods of the multiple-freedom-degree connecting rod mechanism driven by a control motor, and facilitates field construction.