KR20140052130A - Control system of independant tool valve controlled by pilot signal - Google Patents

Control system of independant tool valve controlled by pilot signal Download PDF

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Publication number
KR20140052130A
KR20140052130A KR1020120116444A KR20120116444A KR20140052130A KR 20140052130 A KR20140052130 A KR 20140052130A KR 1020120116444 A KR1020120116444 A KR 1020120116444A KR 20120116444 A KR20120116444 A KR 20120116444A KR 20140052130 A KR20140052130 A KR 20140052130A
Authority
KR
South Korea
Prior art keywords
tool
valve
cylinder
pilot
flow rate
Prior art date
Application number
KR1020120116444A
Other languages
Korean (ko)
Inventor
곽홍섭
Original Assignee
두산인프라코어 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 두산인프라코어 주식회사 filed Critical 두산인프라코어 주식회사
Priority to KR1020120116444A priority Critical patent/KR20140052130A/en
Publication of KR20140052130A publication Critical patent/KR20140052130A/en

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2221—Control of flow rate; Load sensing arrangements
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2264—Arrangements or adaptations of elements for hydraulic drives
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2264—Arrangements or adaptations of elements for hydraulic drives
    • E02F9/2267—Valves or distributors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2200/00—Type of vehicle
    • B60Y2200/40—Special vehicles
    • B60Y2200/41—Construction vehicles, e.g. graders, excavators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/405—Flow control characterised by the type of flow control means or valve

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Operation Control Of Excavators (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

According to the present invention, a tool cylinder which operates the working tool of a construction machine, and a tool valve for controlling the flux supplied to the tool cylinder can be independently controlled. Therefore, the tool valve can be individually controlled regardless of the load applied to the working tool, thereby preventing a hunting phenomenon wherein the opening and closing of the tool valve repeats according to the work load and stably controlling the system.

Description

[0001] The present invention relates to a pilot operated valve control system,

The present invention relates to a stand-alone tool valve control system of a pilot operated type, and more particularly, to a system and method for independently controlling a tool cylinder for operating a working tool of a construction machine and a tool valve for controlling a flow rate supplied to the tool cylinder, And more particularly to a pilot operated independent tool valve control system capable of stably controlling the tool valve regardless of the load applied to the tool.

Generally, a construction machine uses a hydraulic cylinder to operate a work tool such as a dozer or a bucket. At this time, a tool valve installed on a hydraulic cylinder is opened and closed by an operation lever such as a joystick valve, And work with the work tool accordingly.

For example, as shown in Fig. 1, the operating system of the excavator doser D includes a pair of dozer cylinders C, a double check valve CV provided in the dozer cylinder C, And a control valve SV and a control lever J for controlling the flow rate of the main pump PM.

Therefore, when the operating lever J is operated, the doser cylinder control valve SV is opened and closed to adjust the flow rate supplied from the main pump PM, and the double check valve CV is controlled to the hydraulic pressure supplied from the main pump PM The dozer cylinder C is operated at the same time as opening and closing, and the work using the doser D is performed.

However, if both the double check valve (CV) and dozer cylinder (C) are operated by the operating pressure of the main pump (PM), the double check valve (CV) The double check valve CV is opened again when the external load is reduced and the operating pressure of the main pump PM is increased. Therefore, there is a problem that hunting phenomenon occurs due to repetition of such operation.

SUMMARY OF THE INVENTION The present invention has been proposed in order to solve the above-mentioned problems, and it is an object of the present invention to provide a method and apparatus for controlling a tool cylinder for operating a work tool of a construction machine and a tool valve for controlling a flow rate of the tool cylinder, And to provide a pilot-operated independent tool valve control system capable of stably controlling the tool valve regardless of a load.

To this end, a pilot-operated independent tool-valve control system according to the present invention comprises a tool cylinder for operating a work tool of a construction machine; A tool valve for adjusting a flow rate supplied to the tool cylinder; A main pump for supplying operating hydraulic pressure to the tool cylinder through the tool valve to independently control the tool cylinder; A cylinder control valve for regulating a flow rate supplied from the main pump; A pilot pump for supplying working oil pressure to the tool valve to independently control the tool valve; A pilot valve for regulating a flow rate supplied from the pilot pump; And a shuttle valve whose flow rate is adjusted by an operation lever for operating the working tool and whose output is connected to the control input of the cylinder control valve and the pilot valve to control the cylinder control valve and the pilot valve at the same time .

In this case, the tool cylinders are each formed as a pair at both ends of the working tool, and the tool valve is preferably a double check valve provided in each of the pair of tool cylinders.

Preferably, the tool cylinder and the cylinder control valve are supplied with a flow rate through a main pipe, and the tool valve and the pilot valve are independently supplied with a flow rate through a valve pipe separated from the main pipe.

According to the present invention, a tool cylinder for operating a working tool of a construction machine and a tool valve for controlling a flow rate to be supplied to the tool cylinder can be independently controlled.

Accordingly, the tool valve can be independently controlled regardless of the load applied to the work tool, thereby preventing the hunting phenomenon in which the tool valve is repeatedly opened and closed according to the work load, and the system can be stably controlled.

1 is a view showing a tool valve control system of a construction machine working tool according to the prior art.
2 is a diagram illustrating a pilot operated independent tool valve control system in accordance with the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a pilot-operated independent tool valve control system according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Hereinafter, an excavator dozer is described as an example of a working tool, but it is obvious that the present invention can be applied to various work tools mounted on a construction machine in addition to a dozer.

As shown in FIG. 2, the pilot operated tool control system of the pilot operated type according to the present invention includes a tool cylinder C, a tool valve CV, a main pump PM, a cylinder control valve SV, a pilot pump 10, a pilot vlave 20, and a shuttle valve 30.

The pilot valve 10, the pilot valve 20 and the shuttle valve 30 are specifically added to the present invention in a manner different from the prior art. Further, the tool valve CV is different from the conventional art by the main pump PM Are independently controlled so as to be controlled only by the pilot pump 10 without being controlled.

For this purpose, the flow rate of the tool cylinder (C) and the cylinder control valve (SV) is supplied through the main pipe, and the tool valve CV and the pilot valve (20) do.

More specifically, the tool cylinder C is a hydraulic cylinder that operates the work tool D of the construction machine by the supplied hydraulic pressure. For example, when the working tool D is a dozer of an excavator, the tool cylinder C is a dozer cylinder for raising or lowering the doser of the excavator.

The tool valve CV regulates the flow rate supplied to the tool cylinder C. When the working tool D is a doser, the tool valve CV is a double check valve provided in each of the tool cylinders C connected to both ends of the doser.

The main pump PM supplies the working hydraulic pressure to the tool cylinder C via the tool valve CV so as to control the tool cylinder C independently. This main pump PM supplies operating pressure to the tool cylinder C by supplying the oil stored in the oil tank at a high pressure.

The cylinder control valve SV controls the flow rate supplied from the main pump PM so that the tool cylinder C and the cylinder control valve SV are supplied through the main pipe, And the hydraulic pressure is applied separately.

The pilot pump 10 supplies an operating hydraulic pressure to the tool valve CV so as to independently control the tool valve CV so that the hydraulic pressure supplied from the pilot pump 10 is used only by controlling the tool valve CV do.

The pilot pump 10 uses the same oil tank as the oil pump for the main pump PM or supplies the oil stored in the separate oil tank to the oil pressure for opening and closing the tool valve CV.

The pilot valve (20) regulates the flow rate supplied from the pilot pump (10).

Since the flow rate passing through the pilot valve 20 is independently supplied to the tool valve CV via the valve pipe, the tool valve CV is independently opened and closed by the oil pressure of the pilot pump 10. [

Therefore, it is possible to perform stable control irrespective of the size of the external load applied to the doser, which is the working tool (D).

The shuttle valve 30 is regulated in flow rate by an operation lever J (for example, a dozer joystick valve) that operates the work tool D. And its output end is connected to the control input of the cylinder control valve SV and the pilot valve 20, respectively.

Therefore, the cylinder control valve SV and the pilot valve 20 are simultaneously controlled by the flow rate supplied through the shuttle valve 30.

It is necessary to open and close the tool valve CV while supplying the hydraulic pressure to the tool cylinder C in synchronization with the operation of the operation lever J in order to operate the working tool D, Lt; / RTI >

According to the present invention constructed as described above, the operating pressure of the working tool D supplied to the tool cylinder C through the main pump PM as indicated by the solid line in Fig. 2, Similarly, the opening and closing hydraulic pressure supplied to the tool valve CV through the pilot pump 10 is separately supplied.

Therefore, the tool valve CV is independently controlled regardless of the load applied to the work tool D when the work tool D is lifted or lowered, so that the opening and closing of the tool valve CV is repeated according to the work load It prevents the hunting phenomenon and enables stable control of the system.

That is, conventionally, since the hydraulic pressure supplied through the main pump PM is simultaneously supplied to the working tool D and the tool valve CV as indicated by the solid line and the dotted line in Fig. 1, The tool valve CV is closed by the pressure caused by the external load at the time of lowering, and the moving speed of the working tool D is lowered, the present invention solves this problem.

If the external load is reduced and the operating pressure of the main pump PM is increased, the tool valve CV is opened again. In this case, the hunting phenomenon occurs in which the tool valve CV is repeatedly opened and closed .

The specific embodiments of the present invention have been described above. It is to be understood, however, that the scope and spirit of the present invention is not limited to these specific embodiments, and that various modifications and changes may be made without departing from the spirit of the present invention. If you have, you will understand.

Therefore, it should be understood that the above-described embodiments are provided so that those skilled in the art can fully understand the scope of the present invention. Therefore, it should be understood that the embodiments are to be considered in all respects as illustrative and not restrictive, The invention is only defined by the scope of the claims.

D: Work Tool C: Tool Cylinder
CV: Tool valve PM: Main pump
SV: Cylinder control valve 10: Pilot pump
20: pilot valve 30: shuttle valve

Claims (3)

A tool cylinder (C) for operating a working tool (D) of the construction machine;
A tool valve CV for regulating a flow rate of the fluid supplied to the tool cylinder C;
A main pump (PM) for supplying operating hydraulic pressure to the tool cylinder (C) through the tool valve (CV) so as to independently control the tool cylinder (C);
A cylinder control valve SV for regulating a flow rate supplied from the main pump PM;
A pilot pump (10) for supplying working oil pressure to the tool valve (CV) so as to independently control the tool valve (CV);
A pilot valve (20) for regulating a flow rate supplied from the pilot pump (10); And
The flow rate is controlled by an operation lever J for operating the working tool D and an output end is connected to the control input of the cylinder control valve SV and the pilot valve 20, And a shuttle valve (30) for simultaneously controlling the pilot valve (20) and the pilot valve (20). The method according to claim 1,
The tool cylinder CV is a double check valve provided in each of the pair of tool cylinders C. Each of the tool cylinders C is a double check valve provided at both ends of the working tool D, A pilot operated independent tool valve control system. The method according to claim 1,
The tool cylinder CV and the pilot valve 20 are connected to each other through a valve pipe separated from the main pipe so that the flow rate is independently Wherein the pilot valve control system is a pilot valve control system.
KR1020120116444A 2012-10-19 2012-10-19 Control system of independant tool valve controlled by pilot signal KR20140052130A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020120116444A KR20140052130A (en) 2012-10-19 2012-10-19 Control system of independant tool valve controlled by pilot signal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020120116444A KR20140052130A (en) 2012-10-19 2012-10-19 Control system of independant tool valve controlled by pilot signal

Publications (1)

Publication Number Publication Date
KR20140052130A true KR20140052130A (en) 2014-05-07

Family

ID=50885418

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020120116444A KR20140052130A (en) 2012-10-19 2012-10-19 Control system of independant tool valve controlled by pilot signal

Country Status (1)

Country Link
KR (1) KR20140052130A (en)

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