The slewing hydraulic system of hydraulic excavator is mainly used to realize the slewing movement of hydraulic excavator. The slewing system of hydraulic excavator can be divided into quantitative pump drive, single power adjustable variable pump drive and full power adjustable double variable pump drive. When the hydraulic excavator works, the slewing angle of the slewing platform is generally 70 °~ 180 ° between. When the turning angle is large, the turning process of the platform can be divided into three stages: acceleration, uniform speed and deceleration.
The rotary motion characteristics of hydraulic excavator can be divided into three stages: acceleration stage when the bucket is full, uniform rotation stage when the bucket is full, deceleration stage when the bucket is full, return stage when the bucket is empty and rotary cycle stage.
The main reason of energy loss in the rotary process of hydraulic excavator is the overflow loss caused by the output flow of hydraulic pump and the required flow of rotary hydraulic motor. During the braking process, the kinetic energy of the turntable is converted into heat energy loss.
