[go: up one dir, main page]

KR101328847B1 - Negative Flow Control System for Mini Excavator - Google Patents

Negative Flow Control System for Mini Excavator Download PDF

Info

Publication number
KR101328847B1
KR101328847B1 KR1020090065168A KR20090065168A KR101328847B1 KR 101328847 B1 KR101328847 B1 KR 101328847B1 KR 1020090065168 A KR1020090065168 A KR 1020090065168A KR 20090065168 A KR20090065168 A KR 20090065168A KR 101328847 B1 KR101328847 B1 KR 101328847B1
Authority
KR
South Korea
Prior art keywords
spool
negative
pump
main
valve
Prior art date
Legal status (The legal status 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 status listed.)
Active
Application number
KR1020090065168A
Other languages
Korean (ko)
Other versions
KR20110007639A (en
Inventor
이민희
신우현
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 KR1020090065168A priority Critical patent/KR101328847B1/en
Publication of KR20110007639A publication Critical patent/KR20110007639A/en
Application granted granted Critical
Publication of KR101328847B1 publication Critical patent/KR101328847B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • 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
    • B60Y2200/412—Excavators
    • 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
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/08—Regulating by delivery pressure
    • 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
    • F15B2211/20576—Systems with pumps with multiple pumps

Landscapes

  • 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)

Abstract

본 발명은 소형 굴삭기용 네가티브 유량제어 시스템에 관한 것으로 특히, 공지된 유량제어 시스템에 있어서, 메인 컨트롤 밸브 내 선회스풀과 옵션스풀 및 도저스풀을 제외한 각 작업장치별 스풀을 메인압력 P1, P2의 바이패스 라인을 따라 각각 배열하고, 좌주행스풀과 우주행스풀, 붐1스풀, 붐2스풀, 암1스풀, 암2스풀 및 버켓스풀의 절환 스트로크를 네거티브 압력(Pi1, Pi2)으로 전환하는 네가콘 밸브를 암2스풀과 붐2스풀의 외곽부 바이패스 라인에 각각 설치하며, 네거티브 압력 Pi1, Pi2 중 상대적으로 낮은 압력(Pi)을 선별밸브를 통해 선별하여, 상기 Pi 압력라인을 메인펌프의 레귤레이터에 연결하고, 각 작업장치의 스풀을 통과하는 바이패스 라인의 메인 유량 중 네가콘 밸브를 통과한 P1, P2 유량은 각각 탱크로 빠지도록 연결한 것을 특징으로 한다.The present invention relates to a negative flow control system for a small excavator, and in particular, in the known flow control system, the spool for each work device except the swing spool and the option spool and the doser spool in the main control valve is replaced by the main pressure P1, P2. Negons, which are arranged along the pass line and convert the switching strokes of left running spool, space hanging spool, boom 1 spool, boom 2 spool, arm 1 spool, arm 2 spool and bucket spool to negative pressure (Pi1, Pi2) Valves are installed on the bypass lines of the arm 2 spool and the boom 2 spool, respectively, and the lower pressure Pi among the negative pressures Pi1 and Pi2 is selected through the selector valve, and the Pi pressure line is regulated by the main pump regulator. And the flow rates of P1 and P2 passing through the negative cone valve of the main flow rate of the bypass line passing through the spool of each work device are connected to the tank, respectively.

이와 같이 메인컨트롤 밸브 내 각 작업장치의 스풀 절환 스트로크를 네가콘 밸브를 통해 네거티브 압력(Pi1, Pi2)으로 변환시킨 다음, 상기 Pi1, Pi2 압력 중 상대적으로 낮은 압력(Pi)을 선별밸브를 통해 선별하고, 상기 Pi 압력라인을 메인펌프의 레귤레이터에 연결하여, 하나의 실린더 블럭에 펌프1, 펌프2가 연결된 메인펌프의 사판각을 제어하여 펌프1, 펌프2의 토출 유량을 동시에 제어함으로써 기존의 작업부하에 따른 전마력 제어기능 외, 운전자의 작업장치 조작정도에 따라 메인 펌프의 적정 유량토출이 구현 가능한 네거티브 유량제어시스템을 통하여 불필요한 동력 손실을 줄일 수 있어 연료 소모 절감 효과를 가져 올 수 있는 것이다.In this way, the spool switching stroke of each work device in the main control valve is converted to negative pressure Pi1 and Pi2 through the negative cone valve, and then the relatively low pressure Pi among the pressures Pi1 and Pi2 is selected through the selection valve. The Pi pressure line is connected to the regulator of the main pump, and the swash plate angle of the main pump connected to the pump 1 and the pump 2 to one cylinder block is controlled to simultaneously control the discharge flow rates of the pump 1 and the pump 2. In addition to the total horsepower control function according to the load, the negative flow control system that can implement the proper flow rate of the main pump according to the operation of the operator's work device can reduce the unnecessary power loss can bring the fuel consumption effect.

Split Flow Pump, 네가콘 밸브, 레귤레이터, 소형 굴삭기, 네거티브 유량제어시스템, 건설장비 Split Flow Pump, Negacon Valve, Regulator, Compact Excavator, Negative Flow Control System, Construction Equipment

Description

소형 굴삭기용 네가티브 유량제어 시스템{Negative Flow Control System for Mini Excavator}Negative Flow Control System for Mini Excavator

본 발명은 소형 굴삭기용 네가티브 유량제어 시스템에 관한 것으로, 더욱 상세하게는 작업장치의 스풀 절환 스트로크에 따른 네거티브 신호를 이용, 메인펌프의 사판각을 제어하여 펌프1 및 펌프2의 토출유량을 동시에 제어하는 방식을 통해 연료의 낭비를 방지할 수 있도록 발명한 것이다.The present invention relates to a negative flow control system for a small excavator, and more particularly, by controlling the swash plate angle of the main pump by using a negative signal according to the spool switching stroke of the working device to control the discharge flow rate of the pump 1 and the pump 2 simultaneously. Invented to prevent the waste of fuel through the way.

일반적으로 종래 소형 굴삭기에서의 메인펌프는 하나의 실린더 블럭을 이용, 펌프에 별도로 마련된 2개의 포트를 통해 동일한 유량을 토출하는 가변유량형 단일 실린더블록 피스톤 펌프방식을 채택하고 있는데, 이와 같은 가변유량형 단일 실린더블록 피스톤 펌프는 경사판이 하나이므로 두 개의 펌프에서 경사각이 동일한 구성을 갖는다.In general, the main pump of the conventional compact excavator adopts a variable flow type single cylinder block piston pump method that discharges the same flow rate through two ports provided separately in a pump using a single cylinder block. Since the single cylinder block piston pump has one inclined plate, the inclination angles of the two pumps have the same configuration.

이와 같은 펌프의 경사각은 메인압력인 P1, P2를 합한 전체 압력에 따라 변하며, 엔진마력에 따른 마력제어기능을 수행한다.The inclination angle of the pump is changed according to the total pressure of the sum of the main pressures P1 and P2, and performs the horsepower control function according to the engine horsepower.

즉, 출력은 토출 압력과 유량의 곱이 일정하도록((P1+P2) X Q = 일정) 조절된다. That is, the output is adjusted so that the product of the discharge pressure and the flow rate is constant ((P1 + P2) X Q = constant).

이러한 구성을 갖는 종래 펌프 유량제어 시스템은 작업장치의 부하에 따라 메인펌프의 출력마력이 엔진의 출력마력을 넘지않게 하는 마력제어를 가능하게 한다.The conventional pump flow control system having such a configuration enables horsepower control such that the output horsepower of the main pump does not exceed the output horsepower of the engine depending on the load of the working device.

그러나 각 작업장치(붐, 암, 버켓, 주행)의 스풀 절환 스트로크에 따른 펌프로부터의 적정 유량의 토출은 가능하지 않으며, 불필요한 동력의 소모가 발생한다.However, it is not possible to discharge the proper flow rate from the pump according to the spool switching stroke of each work device (boom, arm, bucket, travel), and unnecessary power consumption occurs.

즉, 작업장치의 부하 정도에 따른 마력제어만으로는 불필요한 연료 소모라는 개선의 여지를 남길 수 있는데, 실례로 중형급 굴삭기의 유압시스템은 메인 컨트롤 밸브 내 네거티브 압력형성장치를 두어 작업장치의 스풀 절환 스트로크에 따른 적정 유량의 토출을 구현하고 있다.In other words, the horsepower control according to the load level of the work device may leave room for improvement of unnecessary fuel consumption. For example, the hydraulic system of a medium class excavator has a negative pressure generating device in the main control valve, Implement proper flow rate discharge.

본 발명은 이와 같은 종래의 제반 문제점을 해소하기 위하여 안출한 것으로, 메인컨트롤 밸브 내 각 작업장치의 스풀 절환 스트로크를 네가콘 밸브(Negacon Valve)를 통해 네거티브 압력(Pi1, Pi2)으로 변환시킨 다음, 상기 Pi1, Pi2 압력 중 상대적으로 낮은 압력(Pi)을 선별밸브를 통해 선별하고, 상기 Pi 압력라인을 메인펌프의 레귤레이터에 연결하고, 하나의 실린더 블럭에 펌프1, 펌프2가 연결된 메인펌프의 사판각을 제어하여 펌프1, 펌프2의 토출 유량을 동시에 제어할 수 있도록 함으로써 기존의 작업부하에 따른 전마력 제어기능 외, 운전자의 작업장치 조작정도에 따라 메인 펌프의 적정 유량토출이 구현 가능한 네거티브 유량제어시스템을 통하여 불필요한 동력 손실을 줄일 수 있어 연료 소모 절감 효과를 가져 올 수 있는 소형 굴삭기용 네가티브 유량제어 시스템을 제공하는데 그 목적이 있다.The present invention has been made to solve such a conventional problem, by converting the spool switching stroke of each work device in the main control valve to the negative pressure (Pi1, Pi2) through the negative valve (Negacon Valve), A relatively low pressure Pi of the Pi1 and Pi2 pressures is selected through a selector valve, the Pi pressure line is connected to a regulator of the main pump, and a swash plate of the main pump connected to the pump 1 and the pump 2 in one cylinder block. By controlling the angle and controlling the discharge flow rate of the pump 1 and the pump 2 at the same time, in addition to the horsepower control function according to the existing work load, the negative flow rate that can be discharged to the proper flow rate of the main pump according to the operation of the operator's work device Negative flow regulators for small excavators can reduce fuel consumption by reducing unnecessary power losses through the control system To provide a system which is its purpose.

상기한 목적을 달성하기 위한 본 발명은, 작동유를 공급하는 메인펌프와; 상기 메인펌프의 사판각을 제어하는 레귤레이터와; 4개의 블럭으로 나누어진 메인 컨트롤 밸브와; 상기 메인 컨트롤 밸브 내 메인펌프로부터 토출되는 P1, P2 압력을 시스템 압력 이하로 유지시켜 주는 2개의 메인 릴리프밸브와; 작업장치를 사용하면서 주행 시 좌/우 주행모터에 동일 유량을 공급하게 하는 주행 직진 스풀과; 좌/우 주행모터의 작동유 유입량 및 방향을 결정하는 좌주행모터스풀/우주행모터스풀과; 붐 실린더의 작동유 유입량 및 방향을 결정하는 붐1스풀/붐2스풀과; 버켓의 작동유 유입량 및 방향을 결정하는 버켓스풀과; 암 실린더의 작동유 유입량 및 방향을 결정하는 암1스풀/암2스풀과; 선회동작시 선회모터의 작동유 유입량 및 방향을 결정하는 선회스풀과; 우드그랩 등의 추가장치를 사용시 작동유 유입량 및 방향을 결정하는 옵션스풀과; 도저 블레이드 실린더의 작동유 유입량 및 방향을 결정하는 도저스풀과, 작업장치의 스풀 절환 스트로크를 네거티브 압력(Pi1, Pi2)으로 변환시키는 2개의 네가콘 밸브와; 상기 Pi1, Pi2 압력 중 상대적으로 낮은 압력(Pi)을 선별하는 선별밸브로 구성된 유량제어 시스템에 있어서,The present invention for achieving the above object, and the main pump for supplying hydraulic oil; A regulator for controlling the swash plate angle of the main pump; A main control valve divided into four blocks; Two main relief valves for maintaining the P1 and P2 pressures discharged from the main pump in the main control valve below the system pressure; A traveling straight spool for supplying the same flow rate to the left and right travel motors while traveling using the work device; A left driving motor spool and a right traveling motor spool to determine the flow amount and direction of the hydraulic oil of the left and right traveling motors; Boom 1 spool / Boom 2 spool to determine the hydraulic fluid flow rate and direction of the boom cylinder; Bucket spool to determine the hydraulic fluid flow rate and direction of the bucket; An arm 1 spool / arm 2 spool to determine the flow amount and direction of the working oil of the arm cylinder; A swing spool for determining the flow amount and direction of the hydraulic oil in the swing motor during the swing operation; An option spool to determine the flow rate and direction of the hydraulic oil when using an additional device such as a wood grab; A doser spool for determining the flow rate and direction of the hydraulic oil in the doser blade cylinder, and two negative cone valves for converting the spool switching stroke of the work device into negative pressures Pi and Pi2; In the flow control system consisting of a selection valve for selecting a relatively low pressure (Pi) of the Pi1, Pi2 pressure,

상기 메인 컨트롤 밸브 내 선회스풀과 옵션스풀 및 도저스풀을 제외한 각 작업장치별 스풀을 메인압력 P1, P2의 바이패스 라인을 따라 각각 배열하고, 좌주행스풀과 우주행스풀, 붐1스풀, 붐2스풀, 암1스풀, 암2스풀 및 버켓스풀의 절환 스트로크를 네거티브 압력(Pi1, Pi2)으로 변환시키는 2개의 네가콘 밸브를 암2스풀과 붐2스풀의 외곽부 바이패스 라인에 각각 설치하며, 상기 Pi1, Pi2 압력 중 상대적으로 낮은 압력(Pi)을 선별밸브를 통해 선별하고, 상기 Pi 압력라인을 메인펌프의 레귤레이터에 연결하고, 각 작업장치의 스풀을 통과하는 바이패스 라인의 메인 유량 중 네가콘 밸브를 통과한 P1, P2 유량은 각각 탱크로 빠지도록 연결한 것을 특징으로 한다.The spool for each work device except the turning spool and the option spool and the doser spool in the main control valve are arranged along the bypass lines of the main pressures P1 and P2, respectively, and the left driving spool, the space hanging spool, the boom 1 spool, and the boom 2 Two negative cone valves for converting the spool, arm 1 spool, arm 2 spool and bucket spool switching stroke to negative pressure (Pi1, Pi2) are installed on the outer bypass line of the arm 2 spool and boom 2 spool respectively. The relatively low pressure Pi of the Pi1 and Pi2 pressures is selected through a selector valve, the Pi pressure line is connected to the regulator of the main pump, and the negative of the main flow rate of the bypass line passing through the spool of each work device. P1 and P2 flow rate passing through the cone valve is characterized in that connected to the tank, respectively.

이상에서 설명한 바와 같이 본 발명에 의하면, 메인컨트롤 밸브 내 각 작업장치의 스풀 절환 스트로크를 네가콘 밸브를 통해 네거티브 압력(Pi1, Pi2)으로 변환시킨 다음, 이를 메인펌프의 레귤레이터에 전달하고, 하나의 실린더 블럭에 펌프1, 펌프2가 연결된 메인펌프의 사판각을 제어하여 펌프1, 펌프2의 토출 유량을 동시에 제어함으로써 기존의 작업부하에 따른 전마력 제어기능 외, 운전자의 작업장치 조작정도에 따라 메인 펌프의 적정 유량토출이 구현 가능한 네거티브 유량제어시스템을 통하여 불필요한 동력 손실을 줄일 수 있어 연료 소모 절감 효과를 가져 올 수 있는 등 매우 유용한 발명인 것이다.As described above, according to the present invention, the spool switching stroke of each work device in the main control valve is converted to negative pressures Pi1 and Pi2 through the negative cone valve, and then transferred to the regulator of the main pump. By controlling the swash plate angle of the main pump connected with the pump 1 and the pump 2 to the cylinder block, the discharge flow rate of the pump 1 and the pump 2 is controlled at the same time. It is a very useful invention that can reduce the unnecessary power loss through the negative flow control system that can implement the proper flow discharge of the main pump, which can reduce the fuel consumption.

이하, 첨부된 도면을 참조하여 본 발명에 따른 바람직한 실시 예를 상세히 설명하면 다음과 같다. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

도 1은 본 발명의 유압제어 시스템에 따른 유압 회로도를 나타낸 것이다.1 shows a hydraulic circuit diagram according to the hydraulic control system of the present invention.

이에 따르면 본 발명은, 작동유를 공급하는 메인 펌프(1)와; Accordingly, the present invention, the main pump (1) for supplying the hydraulic oil;

메인 펌프의 사판각을 제어하는 레귤레이터(2)와;A regulator 2 for controlling the swash plate angle of the main pump;

4개의 블럭으로 나누어진 메인 컨트롤 밸브(15)와;A main control valve 15 divided into four blocks;

메인 펌프로부터 토출된 P1, P2 압력을 시스템 압력 이하로 유지시키는 메인 릴리프밸브(3)와;A main relief valve 3 for maintaining the P1 and P2 pressures discharged from the main pump below the system pressure;

작업장치를 사용하면서 주행 시 좌/우 주행모터에 동일 유량을 공급하게 하는 주행직진스풀(4)과;A traveling straight spool (4) for supplying the same flow rate to the left and right travel motors while traveling using the work device;

좌/우 주행모터의 작동유 유입량 및 방향을 결정하는 좌주행모터스풀(5)/우주행모터스풀(6)과;A left running motor spool (5) and a right running motor spool (6) for determining the flow amount and direction of the hydraulic oil of the left and right running motors;

붐 실린더의 작동유 유입량 및 방향을 결정하는 붐1스풀(7)/붐2스풀(8)과;Boom 1 spool (7) / Boom 2 spool (8) for determining the hydraulic oil flow rate and direction of the boom cylinder;

버켓의 작동유 유입량 및 방향을 결정하는 버켓스풀(9)과;Bucket spool (9) for determining the hydraulic fluid flow rate and direction of the bucket;

암 실린더의 작동유 유입량 및 방향을 결정하는 암1스풀(10)/암2스풀(11)과;An arm 1 spool 10 / arm 2 spool 11 for determining the flow amount and direction of the hydraulic oil of the arm cylinder;

선회동작시 선회모터의 작동유 유입량 및 방향을 결정하는 선회스풀(18)과;A swing spool 18 for determining the flow amount and direction of the hydraulic oil in the swing motor during the swing operation;

우드그랩 등의 추가장치 사용시 작동유 유입량 및 방향을 결정하는 옵션스풀(12)과;An option spool (12) for determining hydraulic oil inflow and direction when using an additional device such as wood grab;

도저 블레이드 실린더의 작동유 유입량 및 방향을 결정하는 도저스풀(13)과;A doser spool 13 for determining a flow rate and a direction of operating oil of the doser blade cylinder;

작업장치의 스풀 절환 스트로크를 네거티브 압력(Pi1, Pi2)으로 변환시키는 네가콘 밸브(14)와;A negative cone valve 14 for converting the spool switching stroke of the work device into negative pressures Pi and Pi2;

상기 Pi1, Pi2 압력 중 상대적으로 낮은 압력(Pi)을 선별하는 선별밸브(17)로 구성된 유량제어 시스템에 있어서,In the flow control system consisting of a selection valve 17 for selecting a relatively low pressure (Pi) of the Pi1, Pi2 pressure,

상기 메인 컨트롤 밸브(15) 내 선회스풀(18)과 옵션스풀(12) 및 도저스풀(13)을 제외한 각 작업장치별 스풀을 메인 압력 P1, P2의 바이패스라인(16)을 따라 각각 배열하고,The spools for each working device except the turning spool 18, the option spool 12, and the doser spool 13 in the main control valve 15 are arranged along the bypass lines 16 of the main pressures P1 and P2, respectively. ,

좌주행스풀(5)과 우주행스풀(6), 붐1스풀(7), 붐2스풀(8), 암1스풀(10), 암2스풀(11) 및 버켓스풀(9)의 스트로크를 네거티브 압력(Pi1, Pi2)으로 변환시키는 네가콘 밸브(14)를 암2스풀(11)과 붐2스풀(8)의 외곽부 바이패스라인(16)에 각각 설치하며,The stroke of the left running spool (5), the space hanging spool (6), the boom 1 spool (7), the boom 2 spool (8), the arm 1 spool (10), the arm 2 spool (11), and the bucket spool (9) A negative cone valve 14 for converting negative pressures Pi1 and Pi2 is installed on the outer bypass line 16 of the arm 2 spool 11 and the boom 2 spool 8, respectively.

상기 네거티브 압력 Pi1, Pi2 중 상대적으로 낮은 압력(Pi)울 선별밸브(17)를 통해 선별하고, 상기 Pi 압력 라인을 메인 펌프(1)의 레귤레이터(2)에 연결하며,Among the negative pressures Pi1 and Pi2, a relatively low pressure Pi may be sorted through the separator valve 17, and the Pi pressure line is connected to the regulator 2 of the main pump 1,

각 작업장치의 스풀을 통과하는 바이패스라인(16)의 메인 유량 중 네가콘 밸브(14)를 통과한 P1, P2 유량은 각각 탱크로 빠지도록 연결한 것을 특징으로 한다.Among the main flow rates of the bypass line 16 passing through the spools of the respective working apparatuses, the flow rates of P1 and P2 passing through the negative cone valve 14 are connected to the tanks, respectively.

이와 같이 구성된 본 발명 소형 굴삭기용 네가티브 유량제어 시스템에 대한 작용효과를 설명하면 다음과 같다. Referring to the effects of the negative flow control system for a mini excavator of the present invention configured as described above are as follows.

먼저, 본 발명은 공지된 유량제어 시스템에 있어서, 메인 컨트롤 밸브(15) 내 선회스풀(18)과 옵션스풀(12) 및 도저스풀(13)을 제외한 각 작업장치별 스풀을 메인 압력 P1, P2의 바이패스라인(16)을 따라 각각 배열하고, 또 좌주행스풀(5)과 우주행스풀(6), 붐1스풀(7), 붐2스풀(8), 암1스풀(10), 암2스풀(11) 및 버켓스풀(9)의 절환 스트로크를 네거티브 압력(Pi1, Pi2)으로 변환시키는 네가콘 밸브(14)를 암2스풀(11)과 붐2스풀(8)의 외곽부 바이패스라인(16)에 각각 설치하며, 또한 네거티브 압력 Pi1, Pi2, 중 상대적으로 낮은 압력(Pi)울 선별밸브(17)를 통해 선별하고, 상기 Pi 압력 라인을 메인 펌프(1)의 레귤레이터(2)에 연결하고, 각 작업장치의 스풀을 통과하는 바이패스라인(16)의 메인 유량 중 네가콘 밸브(14)를 통과한 P1, P2 유량은 각각 탱크로 빠지도록 연결한 것을 주요기술 구성요소로 한다.First, the present invention, in the known flow control system, the main pressure P1, P2 spool for each work device except the swing spool 18, the option spool 12 and the doser spool 13 in the main control valve 15 Arranged along the bypass line 16 of the spool, and left running spool (5), space hang spool (6), boom 1 spool (7), boom 2 spool (8), arm 1 spool (10), arm The outer bypass of the arm 2 spool 11 and the boom 2 spool 8 is a negative cone valve 14 which converts the switching stroke of the 2 spool 11 and the bucket spool 9 into negative pressures Pi and Pi2. Respectively installed in the line 16, and the negative pressure Pi1, Pi2, among the relatively low pressure (Pi) wool screening valve 17, and the Pi pressure line of the regulator (2) of the main pump (1) P1 and P2 flow through the negative cone valve 14 of the main flow of the bypass line 16 passing through the spool of each work device are connected to the tank, respectively. And as a component.

이때, 상기 메인펌프(1)의 각 펌프로부터 토출되는 P1, P2, P3 라인에는 각각의 토출 압력을 감지하는 신호라인을 두어 레귤레이터에 연결하였는데, 이는 작업부하에 따른 메인펌프의 사판각을 제어함으로써 전마력 제어가 가능하게 된다.At this time, P1, P2, and P3 lines discharged from each pump of the main pump 1 are connected to the regulator by placing a signal line for detecting the respective discharge pressure, by controlling the swash plate angle of the main pump according to the workload Full horsepower control is possible.

상기와 같이 구성된 본 발명의 유량제어 시스템이 구비된 소형 굴삭기에 대한 각 작업장치(주행, 붐, 암, 버켓)를 사용할 시 해당 작업장치의 스풀이 중립위치에서 어느 한쪽으로 절환되고, 해당 스풀을 통과한 바이패스라인(16) 상의 펌프1 및 펌프2의 유량 P1, P2는 각각의 네가콘 밸브(14)를 통해 네거티브 압력(Pi1, Pi2)으로 변환한 다음, 상기 네거티브 압력 Pi1, Pi2 중 상대적으로 낮은 압력(Pi)울 선별밸브(17)를 통해 선별하고, 상기 Pi 압력 라인을 메인펌프(1) 내 레귤레이 터(2)로 전달하게 된다.When using each work device (driving, boom, arm, bucket) for a small excavator equipped with the flow control system of the present invention configured as described above, the spool of the work device is switched to either side in the neutral position, the spool The flow rates P1 and P2 of the pumps 1 and 2 on the bypass line 16 that have passed are converted into negative pressures Pi and Pi2 through the respective negative cone valves 14, and then the relative pressures of the negative pressures Pi and Pi2. The low pressure Pi is sorted through the separator valve 17, and the Pi pressure line is transferred to the regulator 2 in the main pump 1.

따라서, 상기 메인펌프(1) 내의 레귤레이터(2)에서는 각 작업부하에 따른 메인펌프(1) 토출압력들의 합인 P1 + P2 + P3와 네가티브 압력 Pi에 따른 유량 중 보다 적은 유량을 토출하도록 메인펌프의 사판각을 줄인 후 하나의 실린더 블럭으로 구성된 펌프1, 펌프2의 작동유토출포트로 유량제어된 작동유가 토출되어 메인펌프(1)가 기존의 작업부하에 따른 전마력 제어 기능 외, 각 작업장치의 스풀 절환 스트로크에 따른 적정 유량을 토출할 수 있게 되는 것이다.Accordingly, in the regulator 2 in the main pump 1, the main pump 1 discharges a smaller flow rate of P1 + P2 + P3 and the negative pressure Pi, which are the sum of the discharge pressures of the main pump 1 according to each workload. After reducing the swash plate angle, the flow-controlled hydraulic fluid is discharged to the hydraulic oil discharge ports of the pump 1 and the pump 2 composed of one cylinder block, so that the main pump 1 has the ability to control the horsepower according to the existing workload, It is possible to discharge a proper flow rate according to the spool switching stroke.

이와 같이 본 발명에 따르면 메인컨트롤 밸브 내 각 작업장치의 스풀 절환 스트로크를 네가콘 밸브(Negacon Valve)를 통해 네거티브 압력(Pi1, Pi2)로 변환시킨 다음, 상기 Pi1, Pi2 중 상대적으로 낮은 압력(Pi)울 선별밸브(17)를 통해 선별하고, 상기 Pi 압력 라인을 메인펌프의 레귤레이터에 전달하고, 하나의 실린더 블럭에 펌프1, 펌프2가 연결된 메인펌프의 사판각을 제어하여 펌프1, 펌프2의 토출 유량을 동시에 제어함으로써 기존의 작업부하에 따른 전마력 제어 가능 외, 네거티브 유량제어시스템을 통하여 필요한 동력 손실을 줄일 수 있어 연료 소모 절감 효과를 가져 올 수 있는 것이다.As described above, according to the present invention, the spool switching stroke of each work device in the main control valve is converted into negative pressures Pi1 and Pi2 through a negativecon valve, and then a relatively low pressure Pi among the Pi1 and Pi2. Separating through the wool sorting valve 17, the Pi pressure line is transferred to the regulator of the main pump, the pump 1, pump 2 by controlling the swash plate angle of the main pump connected to the pump 1, pump 2 to one cylinder block By controlling the discharge flow rate of the simultaneous control of the horsepower according to the existing workload, and can reduce the power loss required through the negative flow control system can reduce the fuel consumption.

상술한 실시 예는 본 발명의 가장 바람직한 예에 대하여 설명한 것이지만, 상기 실시 예에만 한정되는 것은 아니며, 본 발명의 기술사상을 벗어나지 않는 범위 내에서 다양한 변형이 가능하다는 것은 당업자에게 있어서 명백한 것이다.It should 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.

도 1은 본 발명의 유압제어 시스템에 따른 유압 회로도.1 is a hydraulic circuit diagram according to the hydraulic control system of the present invention.

* 도면의 주요 부분에 대한 부호의 설명 * Explanation of symbols on the main parts of the drawings

1 : 메인 펌프(Main Pump) 2 : 레귤레이터(Regulator)1: Main Pump 2: Regulator

3 : 메인 릴리프 밸브(Main Relief Valve)3: Main Relief Valve

4 : 주행직진스풀 5 : 좌주행모터스풀4: driving straight spool 5: left running motor spool

6 : 우주행모터스풀 7 : 붐1스풀6: Space Flight Motor Spool 7: Boom 1 Spool

8 : 붐2스풀 9 : 버켓스풀8: Boom 2 Spool 9: Bucket Spool

10 : 암1스풀 11 : 암2스풀10: female 1 spool 11: female 2 spool

12 : 옵션스풀 13 : 도저스풀12: Option Spool 13: Dozer Spool

14 : 네가콘 밸브(Negacon Valve) 14: Negacon Valve

15 : 메인 컨트롤 밸브(Main Control Valve)15: Main Control Valve

16 : 바이패스 라인 17 : 선별밸브
18 : 선회스풀16: bypass line 17: selector valve
18: Slewing Spool

Claims (1)

작동유를 공급하는 메인펌프와; 상기 메인펌프의 사판각을 제어하는 레귤레이터와; 4개의 블럭으로 나누어진 메인 컨트롤 밸브와; 상기 메인 컨트롤 밸브 내 메인펌프로부터 토출되는 P1, P2 압력을 시스템 압력 이하로 유지시켜 주는 2개의 메인 릴리프밸브와; 작업장치를 사용하면서 주행 시 좌/우 주행모터에 동일 유량을 공급하게 하는 주행 직진 스풀과; 좌/우 주행모터의 작동유 유입량 및 방향을 결정하는 좌주행모터스풀/우주행모터스풀과; 붐 실린더의 작동유 유입량 및 방향을 결정하는 붐1스풀/붐2스풀과; 버켓의 작동유 유입량 및 방향을 결정하는 버켓스풀과; 암 실린더의 작동유 유입량 및 방향을 결정하는 암1스풀/암2스풀과; 선회동작시 선회모터의 작동유 유입량 및 방향을 결정하는 선회스풀과; 우드그랩과 같은 추가장치를 사용시 작동유 유입량 및 방향을 결정하는 옵션스풀과; 도저 블레이드 실린더의 작동유 유입량 및 방향을 결정하는 도저스풀과, 작업장치의 스풀 절환 스트로크를 네거티브 압력(Pi1, Pi2)으로 변환시키는 2개의 네가콘 밸브와; 상기 Pi1, Pi2 압력 중 상대적으로 낮은 압력(Pi)을 선별하는 선별밸브;로 구성된 유량제어 시스템에 있어서,A main pump for supplying hydraulic oil; A regulator for controlling the swash plate angle of the main pump; A main control valve divided into four blocks; Two main relief valves for maintaining the P1 and P2 pressures discharged from the main pump in the main control valve below the system pressure; A traveling straight spool for supplying the same flow rate to the left and right travel motors while traveling using the work device; A left driving motor spool and a right traveling motor spool to determine the flow amount and direction of the hydraulic oil of the left and right traveling motors; Boom 1 spool / Boom 2 spool to determine the hydraulic fluid flow rate and direction of the boom cylinder; Bucket spool to determine the hydraulic fluid flow rate and direction of the bucket; An arm 1 spool / arm 2 spool to determine the flow amount and direction of the working oil of the arm cylinder; A swing spool for determining the flow amount and direction of the hydraulic oil in the swing motor during the swing operation; An optional spool to determine the flow and flow of hydraulic fluid when using an additional device such as a wood grab; A doser spool for determining the flow rate and direction of the hydraulic oil in the doser blade cylinder, and two negative cone valves for converting the spool switching stroke of the work device into negative pressures Pi and Pi2; In the flow control system consisting of; Separation valve for sorting a relatively low pressure (Pi) of the Pi1, Pi2 pressure, 상기 메인 컨트롤 밸브 내 선회스풀과 옵션스풀 및 도저스풀을 제외한 각 작업장치별 스풀을 메인압력 P1, P2의 바이패스 라인을 따라 각각 배열하고, 좌주행스풀과 우주행스풀, 붐1스풀, 붐2스풀, 암1스풀, 암2스풀 및 버켓스풀의 절환 스트로크를 네거티브 압력(Pi1, Pi2)으로 변환시키는 2개의 네가콘 밸브를 암2스풀과 붐2스풀의 외곽부 바이패스 라인에 각각 설치하며, 상기 Pi1, Pi2 압력 중 상대적으로 낮은 압력(Pi)을 선별밸브를 통해 선별하고, 상기 Pi 압력라인을 메인펌프의 레귤레이터에 연결하며, 각 작업장치의 스풀을 통과하는 바이패스 라인의 메인 유량 중 네가콘 밸브를 통과한 P1, P2 유량은 각각 탱크로 빠지도록 연결하여 단일실린더블록 내 펌프1 및 펌프2의 토출 유량을 각 작업장치의 스풀 절환 스트로크에 따라 동시에 제어하는 것을 특징으로 하는 소형 굴삭기용 네가티브 유량제어 시스템.The spool for each work device except the turning spool and the option spool and the doser spool in the main control valve are arranged along the bypass lines of the main pressures P1 and P2, respectively, and the left driving spool, the space hanging spool, the boom 1 spool, and the boom 2 Two negative cone valves for converting the spool, arm 1 spool, arm 2 spool and bucket spool switching stroke to negative pressure (Pi1, Pi2) are installed on the outer bypass line of the arm 2 spool and boom 2 spool respectively. A relatively low pressure Pi of the Pi1 and Pi2 pressures is selected through a selector valve, the Pi pressure line is connected to a regulator of the main pump, and a negative flow rate of the main flow rate of the bypass line passing through the spool of each work device is selected. The flow rate of P1 and P2 passing through the cone valve is connected to the tank so as to control the discharge flow rate of the pump 1 and the pump 2 in the single cylinder block at the same time according to the spool switching stroke of each work device. Mini excavators negative flow control system for a.
KR1020090065168A 2009-07-17 2009-07-17 Negative Flow Control System for Mini Excavator Active KR101328847B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020090065168A KR101328847B1 (en) 2009-07-17 2009-07-17 Negative Flow Control System for Mini Excavator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020090065168A KR101328847B1 (en) 2009-07-17 2009-07-17 Negative Flow Control System for Mini Excavator

Publications (2)

Publication Number Publication Date
KR20110007639A KR20110007639A (en) 2011-01-25
KR101328847B1 true KR101328847B1 (en) 2013-11-13

Family

ID=43614021

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020090065168A Active KR101328847B1 (en) 2009-07-17 2009-07-17 Negative Flow Control System for Mini Excavator

Country Status (1)

Country Link
KR (1) KR101328847B1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101486988B1 (en) * 2010-12-17 2015-01-30 현대중공업 주식회사 Negative Flow Control System of Small Size Construction Heavy Equipment
WO2015190631A1 (en) * 2014-06-12 2015-12-17 볼보 컨스트럭션 이큅먼트 에이비 Operating apparatus for construction equipment

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5711395B2 (en) * 2011-03-07 2015-04-30 ボルボ コンストラクション イクイップメント アーベー Hydraulic circuit for pipe layer
CN115233766B (en) * 2022-07-08 2023-11-28 湖南工业职业技术学院 Hydraulic control system and hydraulic negative flow control method for excavator

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR0166190B1 (en) * 1995-12-22 1999-02-18 석진철 Apparatus for controlling flowrate of variable hydraulic oil pump in heavy equipment
KR20030056347A (en) * 2001-12-28 2003-07-04 현대중공업 주식회사 Minimum flow control system of pump for excavator
KR20040059118A (en) * 2002-12-28 2004-07-05 현대중공업 주식회사 Flow control apparatus of hydraulic pump for excavators
KR20070082609A (en) * 2006-02-17 2007-08-22 현대중공업 주식회사 Flow distribution device of small excavator

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR0166190B1 (en) * 1995-12-22 1999-02-18 석진철 Apparatus for controlling flowrate of variable hydraulic oil pump in heavy equipment
KR20030056347A (en) * 2001-12-28 2003-07-04 현대중공업 주식회사 Minimum flow control system of pump for excavator
KR20040059118A (en) * 2002-12-28 2004-07-05 현대중공업 주식회사 Flow control apparatus of hydraulic pump for excavators
KR20070082609A (en) * 2006-02-17 2007-08-22 현대중공업 주식회사 Flow distribution device of small excavator

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101486988B1 (en) * 2010-12-17 2015-01-30 현대중공업 주식회사 Negative Flow Control System of Small Size Construction Heavy Equipment
WO2015190631A1 (en) * 2014-06-12 2015-12-17 볼보 컨스트럭션 이큅먼트 에이비 Operating apparatus for construction equipment

Also Published As

Publication number Publication date
KR20110007639A (en) 2011-01-25

Similar Documents

Publication Publication Date Title
US9783960B2 (en) Driving device for work machine
US10107311B2 (en) Hydraulic drive system for construction machine
JP5053689B2 (en) Straight running hydraulic circuit
EP2597211B1 (en) Hydraulic excavator
US10400426B2 (en) Hydraulic control system for construction machine
JP5669448B2 (en) Hydraulic drive system for excavator
US9963856B2 (en) Hydraulic drive system for construction machine
KR100753986B1 (en) Hydraulic circuit for driving straight
US10392780B2 (en) Work machine hydraulic drive device
JP2010013927A (en) Hydraulic drive system for excavator
JP2014502709A (en) Energy recovery system for construction machinery
US20140130488A1 (en) Hydraulic drive apparatus for work machine
JP2011220390A (en) Control device of hydraulic working machine
KR101328847B1 (en) Negative Flow Control System for Mini Excavator
GB2570611A (en) Hydraulic shovel drive system
GB2554020A (en) System for hydraulically driving construction equipment
CN105143686A (en) Construction equipment hydraulic system and control method therefor
CN102140808A (en) Device for enhancing excavating handling characteristics and levelling operation characteristics of excavator
JP6776334B2 (en) Excavator and control valve for excavator
CN106351281B (en) Hydraulic circuits for construction machinery and construction machinery
CN102628284B (en) Oil circuit control device for excavators
US10273983B2 (en) Working machine control system and lower pressure selection circuit
JP3748775B2 (en) Backhoe hydraulic system
JP2020153461A (en) Hydraulic shovel
JP4753307B2 (en) Hydraulic control system for work machines

Legal Events

Date Code Title Description
PA0109 Patent application

Patent event code: PA01091R01D

Comment text: Patent Application

Patent event date: 20090717

PG1501 Laying open of application
A201 Request for examination
PA0201 Request for examination

Patent event code: PA02012R01D

Patent event date: 20120801

Comment text: Request for Examination of Application

Patent event code: PA02011R01I

Patent event date: 20090717

Comment text: Patent Application

E701 Decision to grant or registration of patent right
PE0701 Decision of registration

Patent event code: PE07011S01D

Comment text: Decision to Grant Registration

Patent event date: 20131022

GRNT Written decision to grant
PR0701 Registration of establishment

Comment text: Registration of Establishment

Patent event date: 20131106

Patent event code: PR07011E01D

PR1002 Payment of registration fee

Payment date: 20131106

End annual number: 3

Start annual number: 1

PG1601 Publication of registration
FPAY Annual fee payment

Payment date: 20170801

Year of fee payment: 5

PR1001 Payment of annual fee

Payment date: 20170801

Start annual number: 5

End annual number: 5

FPAY Annual fee payment

Payment date: 20181030

Year of fee payment: 6

PR1001 Payment of annual fee

Payment date: 20181030

Start annual number: 6

End annual number: 6

FPAY Annual fee payment

Payment date: 20191029

Year of fee payment: 7

PR1001 Payment of annual fee

Payment date: 20191029

Start annual number: 7

End annual number: 7

PR1001 Payment of annual fee

Payment date: 20201027

Start annual number: 8

End annual number: 8

PR1001 Payment of annual fee

Payment date: 20211026

Start annual number: 9

End annual number: 9

PR1001 Payment of annual fee

Payment date: 20221024

Start annual number: 10

End annual number: 10

PR1001 Payment of annual fee

Payment date: 20231024

Start annual number: 11

End annual number: 11