Hybrid power hydraulic excavator system adopting movable arm closed control

Abstract

The invention discloses a hybrid power hydraulic excavator system adopting movable arm closed control, comprising an internal combustion engine, a multitandem valve bank, a variable displacement hydraulic pump, a generator, an electric energy storage unit, a movable arm control system, a rotation control system, a bucket hydraulic cylinder and a bucket rod hydraulic cylinder, wherein a motor with variable rotation speed is used for driving the hydraulic pump with three oil ports to directly control a movable arm hydraulic cylinder, so that the vertical movement of a movable arm of a hydraulic excavator is realized; the rotation of the upper rotation main body of the hydraulic excavator relative to the lower rotation main body is realized through controlling a rotation motor / generator by the rotation control system; a hybrid power drive mode is adopted, the potential energy of the movable arm and the kinetic energy of rotation can be directly converted into electric energy to be stored in the electric energy storage unit. According to the hybrid power hydraulic excavator system adopting movable arm closed control, the recycle and release of the potential energy of the movable arm are conveniently controlled, and the system has the advantages that the energy efficiency is high, the structure is simplified, the fuel consumption of a whole machine is low, the work efficiency and the energy utilization are high, and the like.

Description

technical field [0001] The invention relates to a hybrid power hydraulic excavator, in particular to a hybrid power hydraulic excavator system in which the boom adopts a closed control mode. Background technique [0002] During the working process of the hydraulic excavator, due to the up and down swing of the boom, stick and bucket and the rotary motion of the rotary mechanism are very frequent. And a lot of energy is wasted when the boom is lowered. In order to reduce the waste of this part of energy and protect the hydraulic components, it is necessary to recycle the kinetic energy of the hydraulic excavator's slewing braking and the potential energy of the lowering of the boom. The hybrid driving method proposed in recent years provides convenient conditions for the storage and reuse of hydraulic excavator potential energy. The invention patent authorized on 2012.11.07, the control device for hybrid construction machinery (CN200980110700.3) discloses such a The system ...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a hybrid hydraulic excavator drive system based on the closed control of the boom to realize the hydraulic Efficient recovery and reuse of the potential energy of the excavator arm. The electric motor / generator is used to convert the rotary braking kinetic energy and the potential energy of the boom lowering into electric energy, which is stored in the additional electric energy storage unit. Utilize, in order to minimize the energy consumption of hydraulic excavator operation process

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