KR20140002296A - Flow control device for excavator operated by electrical signal - Google Patents

Flow control device for excavator operated by electrical signal Download PDF

Info

Publication number
KR20140002296A
KR20140002296A KR1020120070429A KR20120070429A KR20140002296A KR 20140002296 A KR20140002296 A KR 20140002296A KR 1020120070429 A KR1020120070429 A KR 1020120070429A KR 20120070429 A KR20120070429 A KR 20120070429A KR 20140002296 A KR20140002296 A KR 20140002296A
Authority
KR
South Korea
Prior art keywords
excavator
control
piston
control valve
control device
Prior art date
Application number
KR1020120070429A
Other languages
Korean (ko)
Inventor
조준연
이기용
Original Assignee
현대중공업 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 현대중공업 주식회사 filed Critical 현대중공업 주식회사
Priority to KR1020120070429A priority Critical patent/KR20140002296A/en
Publication of KR20140002296A publication Critical patent/KR20140002296A/en

Links

Images

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
    • E02F9/2267—Valves or distributors
    • 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
    • E02F9/2278—Hydraulic circuits
    • E02F9/2285—Pilot-operated systems
    • 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
    • E02F9/2278—Hydraulic circuits
    • E02F9/2292—Systems with two or more pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B27/00—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders
    • F04B27/08—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders coaxial with, or parallel or inclined to, main shaft axis
    • 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
    • F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
    • F15B13/042—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure
    • F15B13/043—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure with electrically-controlled pilot valves
    • 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
    • B60Y2200/412—Excavators

Landscapes

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

Abstract

The present invention relates to a flow control device for an excavator operating with an electric signal, the purpose of which is to control the discharge flow rate of the main pump based on the signal pressure from the actuators and the manipulator provided in the excavator to enable more accurate flow control In addition, the present invention provides an excavator flow control device that operates with an electric signal to reduce unnecessary fuel consumption. Excavator flow control device for operating the electric signal of the present invention for this purpose is connected to the swash plate of the variable displacement main pump provided in the excavator to control the tilt angle of the swash plate; A control valve connected to the piston to control the piston to adjust the tilt angle of the swash plate; And a pilot pressure control valve for adjusting the pilot pressure provided to the control valve according to the current value provided from the main control unit of the excavator, and configured to control the discharge flow rate of the main pump by the main control unit.

Description

Flow Control Device for Excavator Operated by Electrical Signal

The present invention relates to a flow control device for an excavator that operates with an electric signal, and in particular, receives a signal pressure generated from an actuator and an actuator provided in the excavator, calculates a flow rate required for driving the actuator, and based on the calculated flow rate information. The present invention relates to an excavator flow control device that operates with an electric signal to control the discharge flow rate of the main pump.

In general, an excavator is equipped with a hydraulic system for providing power for driving various equipment, the hydraulic system is a hydraulic pump for discharging the hydraulic oil, a hydraulic control valve for controlling the flow direction and flow of the hydraulic oil and various mechanical work Actuator and so on. The hydraulic pump is composed of a variable flow type hydraulic pump to prevent unnecessary fuel consumption.

1 is a hydraulic circuit diagram showing the structure of a conventional excavator main pump regulator.

The regulator 20 controls the discharge flow rates of the main pumps 11 and 12 according to the working conditions of the actuator, the piston 21 connected to the swash plates of the main pumps 11 and 12, and the two pumps provided in the excavator ( Pilot piston driven by control signal 23 or negative signal pressure or positive signal pressure driven by pilot pressure Pf set according to the pressures P1 and P2 discharged from 11 and 12 and the current value supplied from MCU. It consists of the control valve 22 which controls the said piston 21, moving the spool by 24. As shown in FIG.

The conventional regulator configured as described above controls the discharge flow rate of the main pump by switching the flow path while the spool of the control valve is moved by a piston having a relatively large movement between the control piston and the pilot piston.

However, the conventional regulator as described above, the accuracy is reduced by controlling the flow rate of the main pump based on the load applied to the main pump or the main control valve instantaneously without considering the state of the entire equipment, thereby consuming unnecessary fuel There is a problem that occurs.

The present invention has been made in consideration of the above problems, and an object of the present invention is to control the discharge flow rate of the main pump based on the signal pressure from the actuators and the manipulator provided in the excavator, it is possible to control the flow rate more precisely, This provides an excavator flow control device that operates with an electrical signal to reduce unnecessary fuel consumption.

The flow control device for an excavator operated by the electric signal of the present invention, which achieves the object as described above and performs a problem for eliminating the drawbacks of the related art, is connected to the swash plate of the variable displacement main pump provided in the excavator and has a tilt angle of the swash plate. Piston to adjust the; A control valve connected to the piston to control the piston to adjust the tilt angle of the swash plate; And a pilot pressure control valve that adjusts the pilot pressure provided to the control valve according to the current value provided from the main control unit of the excavator, characterized in that the discharge flow rate of the main pump is controlled by the main control unit.

On the other hand, the main control unit is configured to receive the signal pressure from the actuator and the manipulator provided in the excavator is configured to calculate the current value provided to the pilot pressure control valve.

According to the present invention having the above characteristics, by controlling the maximum discharge flow rate of the main pump based on the signal pressure from the actuator and the actuator such as the boom cylinder, arm cylinder, bucket cylinder, swing motor provided in the excavator, It is possible to control the precise flow rate reflecting the state of, through which there is an effect that can prevent unnecessary consumption of fuel.

1 is a hydraulic circuit diagram showing a structure of a conventional excavator main pump regulator;
Figure 2 is a hydraulic circuit diagram showing the structure of the flow control device for excavators in accordance with a preferred embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the embodiments of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

Figure 2 shows a hydraulic circuit diagram showing the structure of the flow control device for excavators according to the preferred embodiment of the present invention.

Excavator flow control device 120 operating with an electrical signal according to the present invention by controlling the discharge flow rate of the main pump (111, 112) based on the overall state information of the equipment provided from the main control unit (MCU), It has the characteristic that flow control is possible, and is comprised from the piston 121, the control valve 122, and the pilot pressure control valve 123.

The piston 121 is connected to the swash plate of the main pump (111, 112) to provide a function to adjust the tilt angle of the swash plate.

The control valve 122 is to control the hydraulic pressure transmitted to the piston 121, the spool is moved by the control piston 124 which is operated by the pilot pressure transmitted through the pilot pressure control valve 123, As the flow path is switched by the movement of the spool, the oil pressure transmitted to the piston 121 is controlled.

The piston 121 and the control valve 122 has the same configuration and function as the piston and the control valve provided in the conventional regulator, more detailed description thereof will be omitted.

However, in the case of a control valve provided in a conventional regulator, the spool is moved by a control piston operated by a pilot pressure determined according to a load applied to the main pump or the main control valve instantaneously. The valve 122 has a difference in that it is configured to receive and drive the pilot pressure regulated by the pilot pressure control valve 123 controlled by the main control unit of the excavator.

More specifically, the pilot pressure control valve 123 transmits the pilot pressure corresponding to the current value transmitted from the main control unit to the control piston 124.

Meanwhile, the main control unit is provided with a signal pressure generated when an actuator such as a boom cylinder, an arm cylinder, a bucket cylinder, and a swing motor provided in an excavator, and a signal pressure generated by an actuator of an actuator for operating the actuator. The current value to be applied to the control valve 123 is calculated, through which the correct flow rate required for driving the actual actuator is discharged using the main pumps 111 and 112.

On the other hand, preferably, the optimum flow rate required according to the type and operation state of the operation performed in each actuator is set in advance, and when the type and operation state of the operation are recognized by the signal pressure transmitted from the actuator and the manipulator, It is configured to apply a current value to the pilot pressure control valve 123 so that a predetermined optimum flow rate can be discharged from the main pumps 111 and 112.

Excavator flow control device operating by the electric signal of the present invention configured as described above when the work is performed by the actuator provided in the excavator, the main control unit is provided with the signal pressure generated from each actuator and the manipulator to the required flow rate The corresponding current value is calculated, and the current value derived through the calculation is transmitted to the pilot pressure control valve 123.

Meanwhile, the pilot pressure delivered to the control piston 124 is controlled by the pilot pressure control valve 123 received the current value from the main control unit, and the control piston 124 is driven by the adjusted pilot pressure to control the valve. The spool of 122 is moved, and the piston 121 operates as the direction of the flow path is changed by the movement of the spool, thereby adjusting the tilt angle of the swash plate to the required flow rate.

Such a flow control device for an excavator operating with an electric signal according to the present invention controls the maximum discharge flow rate of the main pump (111, 112) based on the actual flow rate required by each actuator, more precise flow control than conventional regulators It is possible, through which there is an advantage to prevent unnecessary fuel consumption.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined in the appended claims and their equivalents. Of course, such modifications are within the scope of the claims.

Description of the Related Art
(111), (112): main pump
120: flow control device
(121): Piston
(122): control valve
(123): pilot pressure control valve
124: Control Piston

Claims (2)

A piston 121 connected to the swash plates of the variable displacement main pumps 111 and 112 provided in the excavator to adjust the tilt angle of the swash plate;
A control valve 122 connected to the piston 121 to control the piston 121 to adjust the tilt angle of the swash plate; And
The discharge flow rate of the main pumps 111 and 112 is controlled by the main control unit, including a pilot pressure control valve 123 for adjusting the pilot pressure provided to the control valve 122 according to the current value provided from the main control unit of the excavator. A flow control device for an excavator operating with an electrical signal, characterized in that said. The method of claim 1,
The main control unit is provided with an actuator provided in the excavator and a signal pressure from the manipulator to calculate the current value provided to the pilot pressure control valve 123, the flow control device for an excavator operating with an electric signal.
KR1020120070429A 2012-06-29 2012-06-29 Flow control device for excavator operated by electrical signal KR20140002296A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020120070429A KR20140002296A (en) 2012-06-29 2012-06-29 Flow control device for excavator operated by electrical signal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020120070429A KR20140002296A (en) 2012-06-29 2012-06-29 Flow control device for excavator operated by electrical signal

Publications (1)

Publication Number Publication Date
KR20140002296A true KR20140002296A (en) 2014-01-08

Family

ID=50139391

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020120070429A KR20140002296A (en) 2012-06-29 2012-06-29 Flow control device for excavator operated by electrical signal

Country Status (1)

Country Link
KR (1) KR20140002296A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107587546A (en) * 2017-09-07 2018-01-16 徐州徐工挖掘机械有限公司 A kind of control method for improving hydraulic crawler excavator revolution energy saving
US10767667B2 (en) 2016-11-16 2020-09-08 Danfoss Power Solutions (Zhejiang) Co. Ltd. Electronically controlled valve, hydraulic pump, and hydraulic pump system
WO2022119257A1 (en) * 2020-12-03 2022-06-09 현대두산인프라코어 주식회사 Hydraulic system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10767667B2 (en) 2016-11-16 2020-09-08 Danfoss Power Solutions (Zhejiang) Co. Ltd. Electronically controlled valve, hydraulic pump, and hydraulic pump system
CN107587546A (en) * 2017-09-07 2018-01-16 徐州徐工挖掘机械有限公司 A kind of control method for improving hydraulic crawler excavator revolution energy saving
WO2022119257A1 (en) * 2020-12-03 2022-06-09 현대두산인프라코어 주식회사 Hydraulic system

Similar Documents

Publication Publication Date Title
US9181684B2 (en) Pump control unit for hydraulic system
US8006491B2 (en) Pump control apparatus for construction machine
EP2833003B1 (en) Boom drive device
KR101218018B1 (en) Control device for hybrid construction machine
US10364550B2 (en) Hydraulic drive system of work machine
US9920780B2 (en) Slewing drive apparatus for construction machine
US20140227104A1 (en) Hydraulic drive system for electrically-operated hydraulic work machine
KR102391357B1 (en) Hydraulic drive of electric hydraulic working machine
US20180238025A1 (en) Work Machine
US10760246B2 (en) Work machine
WO2013111705A1 (en) Circuit pressure control apparatus, hydraulic pressure control circuit using this circuit pressure control apparatus, and hydraulic pressure control circuit of construction equipment
KR20140050031A (en) Hydraulic control system for construction machinery
JP2016211249A (en) Hydraulic driving system of construction machine
WO2016088573A1 (en) Control system for hybrid construction machine
JP6474702B2 (en) Drive device for work machine
JP6757238B2 (en) Hydraulic drive system
KR20140002296A (en) Flow control device for excavator operated by electrical signal
US10670050B2 (en) Apparatus and method for controlling spool displacement of construction machine
US10655740B2 (en) Work machine
KR101328780B1 (en) Hybrid regulator for main pump of excavator
KR20100075300A (en) Hydraulic pump control apparatus for construction machinery
US20220127823A1 (en) Work Machine
JP5946184B2 (en) Hydraulic drive device for work machine
JP7210451B2 (en) Excavator
KR20100137745A (en) Hydraulic system of nagative control

Legal Events

Date Code Title Description
WITN Withdrawal due to no request for examination