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Hydraulic system for a construction machine

A technology of hydraulic system and hydraulic pump, applied in the field of hydraulic system, can solve problems such as low work efficiency and increased time consumption

Inactive Publication Date: 2013-06-19
VOLVO CONSTR EQUIP AB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] Causes an increase in the time it takes to perform leveling work by manipulating the first and second joysticks 4 and 7 at the same time, thus causing inefficiency in work

Method used

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  • Hydraulic system for a construction machine
  • Hydraulic system for a construction machine

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Embodiment Construction

[0048] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. The objects defined in the specific embodiments, such as detailed structures and elements, are only provided to assist those skilled in the present invention to thoroughly understand the specific details of the present invention, and the present invention is not limited to the embodiments disclosed below.

[0049] Such as figure 2 As shown, a hydraulic system for construction equipment according to an embodiment of the present invention includes:

[0050] First and second variable displacement hydraulic pumps (hereinafter referred to as "first and second hydraulic pumps") 11 and 12;

[0051] First and second joysticks (for example, using hydraulic control rods) 14 and 17, the first and second joysticks 14 and 17 are respectively configured to generate a control signal proportional to the operator's operation amount;

[0052] Operation mode selection s...

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Abstract

Disclosed is a hydraulic system for a construction machine, which makes it possible to adjust the geometric position of a working device comprising a boom and an arm by means of a single manipulation lever, thereby enabling a leveling / flattening process to be conveniently performed. The hydraulic system includes: a working mode selection switch for selecting a leveling / flattening process; a boom driving switch valve for controlling the driving of a boom cylinder in response to a control signal from a first manipulation lever; an arm driving switch valve for controlling the driving of an arm cylinder in response to a control signal from a second manipulation lever; a shuttle valve including input parts that connect to both an electronic proportional control valve and to the first manipulation lever, respectively, and an output part connecting to the boom driving switch valve; and an electronic controller. When a manipulation signal according to a selection of the leveling / flattening process is inputted from the working mode selection switch to the electronic controller, the electronic controller detects and calculates a secondary signal pressure generated according to the manipulation of the second manipulation lever so as to control a discharge flow rate of a second hydraulic pump on the basis of a calculated value of the secondary signal pressure, and uses a secondary signal pressure generated by the electronic proportional control valve on the basis of the calculated value to switch on the boom driving switch valve by means of the shuttle valve, thereby controlling a discharge flow rate of a first hydraulic pump.

Description

Technical field [0001] The invention relates to a hydraulic system for construction equipment, which is configured to perform leveling operations by using an excavator. More particularly, the present invention relates to a hydraulic system configured to conveniently perform leveling work by simultaneously manipulating working devices such as a boom and an arm using a single joystick (RCV). Background technique [0002] Such as figure 1 The traditional hydraulic system for construction equipment shown includes: [0003] First and second variable displacement hydraulic pumps (hereinafter referred to as "first and second hydraulic pumps") 1 and 2; [0004] Boom cylinder 3, which is connected to the first hydraulic pump 1; [0005] The first and second joysticks 4 and 7 (for example, using hydraulic control rods), the first and second joysticks 4 and 7 are respectively configured to generate control signals proportional to the amount of operation of the operator; [0006] The boom drive s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F15B13/044E02F9/22F15B9/08G05G1/04
CPCE02F3/436E02F9/2285E02F9/2292E02F9/2296F15B2211/20546F15B2211/20576F15B2211/6346F15B15/00
Inventor 钰在万崔震闰
Owner VOLVO CONSTR EQUIP AB