Hydraulic excavator energy-conservation control system

Abstract

The invention discloses a hydraulic excavator energy-conservation control system. A three-position four-way hydraulic control reversing valve is connected to a working oil path of a rotary motor, wherein a pilot-operated oil path of the three-position four-way hydraulic control reversing valve is connected with a pilot-operated oil path of a rotary motor main control valve; a two-position three-way hydraulic control main reversing valve is connected to a working oil path of a boom cylinder rodless cavity, wherein a one-way valve is connected between the two-position three-way hydraulic control main reversing valve and the three-position four-way hydraulic control reversing valve, a two-position three-way hydraulic control pilot-operated reversing valve is connected between an oil outlet of a shuttle valve and the two-position three-way hydraulic control main reversing valve and connected with a boom main control valve which is used for controlling a boom to drop the pilot-operated oil paths, and the shuttle valve is connected to the pilot-operated oil paths at the two ends of the rotary motor main control valve. According to the hydraulic excavator energy-conservation control system, when a hydraulic excavator carries out composite operation of boom descending and rotation, the gravitational potential energy produced in the boom descending process can be transferred and supplied to the rotary motor in the form of hydraulic energy which can be used as an auxiliary power source of the rotary motor, so that space is saved, and cost is reduced.

Description

technical field [0001] The invention relates to an energy-saving control system for a hydraulic excavator, which belongs to the technical field of energy-saving control for hydraulic excavators. Background technique [0002] With the development of industrial technology around the world, as an efficient earthwork construction machine, the role of hydraulic excavators in engineering construction is becoming more and more obvious; the working devices of hydraulic excavators have large mass and large inertia. Generally, a throttle valve is installed in the oil return direction of the rodless cavity of the boom cylinder to limit the lowering speed of the boom. However, with this structure, most of the gravitational potential energy of the working device will It will be converted into heat energy at the throttle port, resulting in waste of energy and rise in system temperature, which in turn affects the reliability of system equipment and the working life of hydraulic components....

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Problems solved by technology

[0002] With the development of industrial technology around the world, as an efficient earthwork construction machine, the role of hydraulic excavators in engineering construction is becoming more and more obvious; the working devices of hydraulic excavators have large mass and large inertia. Generally, a throttle valve is installed in the oil return direction of the rodless cavity of the boom cylinder to limit the lowering speed of the boom. However, with this structure, most of the gravitational potential energy of the working device will It will be converted into heat energy at the throttle port, resulting in waste of energy and rise in system temperature, thereby affecting the reli

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