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Hydraulic system of construction equipment, having float function

A technology of construction machinery and functions, applied in the field of hydraulic system, can solve the problems of increasing the manufacturing cost of hydraulic components, and achieve the effect of compact hydraulic pipeline and saving manufacturing cost.

Inactive Publication Date: 2016-06-15
VOLVO CONSTR EQUIP AB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Therefore, when a construction machine such as an excavator or a bulldozer performs a floating function, it is substantially necessary to construct a floating valve between the working device (such as a boom cylinder or a bulldozer cylinder) and a hydraulic control valve, which leads to problems related to the floating valve. The number of hydraulic components and their manufacturing costs increase

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  • Hydraulic system of construction equipment, having float function
  • Hydraulic system of construction equipment, having float function
  • Hydraulic system of construction equipment, having float function

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Embodiment Construction

[0025] The terms or words used in the specification and claims may be used to have the meanings commonly understood by those of ordinary skill in the art to which the present invention belongs. Also, terms or words that are commonly used but not defined in dictionaries should not be ideally or excessively interpreted unless they are clearly and specifically defined.

[0026] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0027] figure 1 is a schematic hydraulic circuit diagram of a hydraulic device for a construction machine with a floating function according to an embodiment of the present invention, figure 2 is a schematic hydraulic circuit diagram of a hydraulic device for construction machinery with a floating function according to another embodiment of the present invention. image 3 is a diagram of a main part of a hydraulic device for a construction machine with a floating functio...

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Abstract

The present invention relates to a hydraulic system of construction equipment, having a float function, comprising: a hydraulic pump and a pilot pump for supplying hydraulic oil for the operation of construction equipment; a remote control valve for outputting a pilot signal corresponding to the operation amount of an operation lever; a hydraulic cylinder for the construction equipment, which is connected to the hydraulic pump; a main control valve provided to the discharge path of the hydraulic pump and controlling the starting, stopping and direction conversion of the hydraulic cylinder at the time of spool conversion; a solenoid valve to be converted to an opening position at the time of on-operation of a float function switch; and a two-stage port relief valve provided to a path between the main control valve and the hydraulic cylinder for the construction equipment and converted at the time of operation of the float function switch so as to return the hydraulic oil of the large chamber of the hydraulic cylinder to the hydraulic tank, thereby lowering the construction equipment.

Description

technical field [0001] The present invention relates to a hydraulic system for a construction machine with a float function, and more particularly, the present invention relates to a hydraulic device for a construction machine with a float function in which, when the float function switch is operated, it is possible to Lowering the working device without the valve to perform leveling or leveling work on the construction site, thereby reducing the number of hydraulic components and reducing manufacturing costs. Background technique [0002] Typically, construction machinery such as excavators or bulldozers are used to perform leveling or leveling work on construction sites. The excavator can be driven to lower the boom so that the bucket touches the ground, and the bulldozer equipment can be driven to touch the ground with the dozer blade mounted on the stick or tilt arm. [0003] As one of the prior art, Korean Patent Application Publication No. 2010-0134827 discloses a hyd...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02F9/22F15B11/02F15B13/02
CPCE02F9/2203E02F9/2285F15B11/028F15B2211/3058F15B2211/7128E02F3/32E02F3/425E02F3/7609E02F3/844
Inventor 孙泳进赵俊
Owner VOLVO CONSTR EQUIP AB