Gravitational potential energy recovery device during descending of engineering machinery movable arm

Abstract

The invention relates to a gravitational potential energy recovery device during descending of an engineering machinery movable arm, comprising three parts, i.e. a hydraulic device for driving the movable arm to work, an accumulator device and a hydraulic system safety protection device, wherein the hydraulic device adopts two bidirectional quantitative hydraulic pumps-motors, an oil port thereof is respectively connected with a rod cavity of a movable arm cylinder (10) and an accumulator (9) by a connecting pipeline, and another oil port thereof is connected with a rodless cavity of the movable arm cylinder (10) by a connecting pipeline; the two bidirectional quantitative hydraulic pumps-motors are driven by mechanical transmission or driven coaxially; the flow ratio of the two bidirectional quantitative hydraulic pumps-motors is 1:(K-1), wherein K is the area ratio of the rodless cavity and the rod cavity of the movable arm cylinder; and the hydraulic system safety protection device mainly comprises three groups of overflowing valves and three groups of check valves which are respectively arranged on connecting pipelines.

Description

technical field [0001] The invention provides a gravitational potential energy recovery device for the lowering of an engineering machinery boom, in particular to a closed hydraulic circuit boom potential energy recovery system using an accumulator. Background technique [0002] Due to the characteristics of large consumption, high fuel consumption and poor emission, construction machinery has become one of the goals pursued by domestic and foreign construction machinery researchers for its high efficiency and energy saving. The energy saving research of construction machinery system is mainly carried out from two aspects: energy saving research based on system control strategy and control method and energy saving research based on system structure. Energy-saving research based on system structure includes energy-saving research based on valve control system improvement, power source system improvement, and energy recovery. Energy-saving research on construction machinery b...

AI Technical Summary

Problems solved by technology

Due to the high cost of electric energy storage components and generators, the practical application of this recycling scheme is limited

Because the lowering process of the boom is basically completed within 2 seconds, during the process of large changes in speed, the power generation of the generator and the charging efficiency of the battery or capacitor are low. At the same time, the repeated conversion of mechanical energy, pressure energy, and electrical energy also greatly reduces energy recovery. Utilization of

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