Apparatus And Method For Recovering Potential Energy Of Boom In A Construction Machinery

摘要

The present invention relates to a boom potential energy regeneration device and method of construction machinery. According to one aspect of the invention, the electric motor driven in the forward, reverse direction in accordance with the control signal input; A bidirectional hydraulic pump driven in both directions by an electric motor; A large chamber line formed between the two-way hydraulic pump and the large chamber of the boom hydraulic cylinder and through which hydraulic fluid flows; A small chamber line formed between the two-way hydraulic pump and the small chamber of the boom hydraulic cylinder and through which hydraulic fluid flows; A boom hydraulic cylinder including a large chamber and a small chamber and being telescopically driven by hydraulic oil in the large chamber and the small chamber; Forming flow paths and inlet ports branched from the large chamber line and the small chamber line, respectively, and forming a return line and an outlet port connected to the tank, block the return line to the tank when the boom is raised, and the small chamber line and the return when the boom is lowered. A direction control valve unit forming a flow path between lines; A return line through which hydraulic oil is returned to the tank from the outlet port of the directional control valve; A generator that is generated by driving a hydraulic pump reversely driven by hydraulic oil flowing from the high pressure large chamber line to the low pressure small chamber line when the boom is lowered; A battery storing electrical energy generated by a generator; And a main controller for outputting a control signal to drive the electric motor, the generator, and the direction control valve unit according to a user's operation signal. It is made, including, here it proposes a boom potential energy regeneration device for a construction machine, characterized in that to use the electrical energy stored in the battery when the boom rises.;Construction machinery, boom, potential energy, regeneration, two-way hydraulic pump, electric motor, directional control valve, excavation