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Hydraulic system for recovering descending energy of movable arm and excavator

A technology of energy recovery and hydraulic system, applied in the field of hydraulic system, can solve problems such as energy loss of excavator arm descending, and achieve the effect of reducing energy consumption

Active Publication Date: 2020-10-30
LIUZHOU LIUGONG EXCAVATORS +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a boom lowering energy recovery hydraulic system and an excavator aiming at the problem of energy loss in the lowering of the boom of the existing excavator, so as to recover the potential energy of the boom when the boom of the excavator is lowered and reduce the machine energy consumption

Method used

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  • Hydraulic system for recovering descending energy of movable arm and excavator
  • Hydraulic system for recovering descending energy of movable arm and excavator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] figure 1 A boom lowering energy recovery hydraulic system is shown, the hydraulic system includes a hydraulic oil tank 12, a hydraulic pump 10 whose pump port is connected to the hydraulic oil tank 12, a boom cylinder control valve 111 connected to the hydraulic pump 10, and a boom cylinder The control valve 111 is connected to the boom cylinder 1. The hydraulic pump 10 is a variable displacement pump driven by the engine, and the hydraulic pump 10 draws hydraulic oil from the hydraulic oil tank 12 . When the boom is lifted, the boom cylinder control valve 111 is in the left position, the hydraulic oil output by the hydraulic pump 10 enters the large chamber of the boom cylinder 1 through the boom cylinder control valve 111, and the piston rod of the boom cylinder extends . When the boom is lowered, the boom cylinder control valve 111 is in the right position, and the oil return circuit from the large chamber of the boom cylinder 1 to the hydraulic oil tank 12 through...

Embodiment 2

[0033] figure 2 A hydraulic system of an excavator is shown. Such as figure 2As shown, the excavator also has the boom lowering energy recovery function. In the hydraulic system, the hydraulic pump 10 includes the left pump, the right pump, and the pilot pump 9. The arm cylinder control valve 111 also includes the arm cylinder control valve for controlling the arm cylinder 115, the bucket cylinder control valve for controlling the bucket cylinder 114, the travel motor control valve for controlling the travel motor 113, and the swing control valve for controlling the swing motor 112 . Compared with the energy recovery component of the first embodiment, the energy recovery component differs mainly in the energy recovery control valve 3 . In this embodiment, the energy recovery control valve 3 is a two-position two-way valve, which is an on-off valve. When the boom is lowered to recover the potential energy of the boom, the energy recovery control valve 3 is in a conduction ...

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Abstract

The invention relates to a hydraulic system for recovering descending energy of a movable arm and an excavator. The hydraulic system for recovering descending energy of the movable arm and the excavator aim at solving the problem of descending energy loss of the movable arm of the excavator in the prior art. The hydraulic system comprises a controller, an energy recovery control valve, an energy output control valve, a variable motor and a flywheel, wherein the energy recovery control valve is connected between a first oil port of the variable motor and a large cavity of a movable arm oil cylinder, a second oil port of the variable motor is in conduction connection with a hydraulic oil tank or a high-pressure receiving oil path through the energy output control valve, and when the movablearm oil cylinder retracts, the large cavity of the movable arm oil cylinder communicates with the first oil port of the variable motor through the energy recovery control valve, otherwise, interception is carried out; and when the movable arm oil cylinder retracts, an oil path from the large cavity of the movable arm oil cylinder to a movable arm oil cylinder control valve is intercepted. The variable motor and the fly wheel are combined to recover the potential energy reduced by the descending of the movable arm, the variable motor can output hydraulic energy to be used by the hydraulic system, and the machine energy consumption is reduced.

Description

technical field [0001] The invention relates to a hydraulic system, and more specifically, to a hydraulic system for recovering energy in lowering a boom and an excavator. Background technique [0002] As a commonly used construction machine, the excavator is powerful and practical in various workshops. The working device of the excavator usually includes a boom, a stick, attachments, etc. The lifting of the boom drives the stick, the attachment, and the goods loaded by the attachment up and down. [0003] Due to the huge weight of the working device of the excavator, it has huge gravitational potential energy after being lifted up. These gravitational potential energy are usually converted into heat energy through the hydraulic system and consumed during the lowering process of the boom. [0004] The gravitational potential energy consumed by the lowering of the boom not only makes the excavator at a higher energy consumption level, but also increases the heat dissipation ...

Claims

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Application Information

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IPC IPC(8): E02F3/36E02F9/22
CPCE02F3/3663E02F9/2217
Inventor 程昭荣韦磊姜旭东宾旭洲刘剑
Owner LIUZHOU LIUGONG EXCAVATORS
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