KR20030052716A - hydraulic apparatus for construction heavy equipment - Google Patents

hydraulic apparatus for construction heavy equipment Download PDF

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Publication number
KR20030052716A
KR20030052716A KR1020010082744A KR20010082744A KR20030052716A KR 20030052716 A KR20030052716 A KR 20030052716A KR 1020010082744 A KR1020010082744 A KR 1020010082744A KR 20010082744 A KR20010082744 A KR 20010082744A KR 20030052716 A KR20030052716 A KR 20030052716A
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South Korea
Prior art keywords
pressure
flow
valve
passage
flow path
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KR1020010082744A
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Korean (ko)
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KR100631064B1 (en
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정해균
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볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비
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Application filed by 볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비 filed Critical 볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비
Priority to KR1020010082744A priority Critical patent/KR100631064B1/en
Priority to US10/247,556 priority patent/US6675904B2/en
Priority to JP2002280457A priority patent/JP3822156B2/en
Priority to GB0222644A priority patent/GB2383383B/en
Priority to CNB021468559A priority patent/CN1285837C/en
Priority to ITMI20022311 priority patent/ITMI20022311A1/en
Priority to DE10250466A priority patent/DE10250466B4/en
Priority to FR0214244A priority patent/FR2834018B1/en
Publication of KR20030052716A publication Critical patent/KR20030052716A/en
Application granted granted Critical
Publication of KR100631064B1 publication Critical patent/KR100631064B1/en

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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02FDREDGING; SOIL-SHIFTING
    • E02F9/00Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20Drives; Control devices
    • E02F9/22Hydraulic or pneumatic drives
    • E02F9/2264Arrangements or adaptations of elements for hydraulic drives
    • E02F9/2267Valves or distributors
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02FDREDGING; SOIL-SHIFTING
    • E02F9/00Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20Drives; Control devices
    • E02F9/22Hydraulic or pneumatic drives
    • E02F9/2221Control of flow rate; Load sensing arrangements
    • E02F9/2225Control of flow rate; Load sensing arrangements using pressure-compensating valves
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02FDREDGING; SOIL-SHIFTING
    • E02F9/00Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20Drives; Control devices
    • E02F9/22Hydraulic or pneumatic drives
    • E02F9/2278Hydraulic circuits
    • E02F9/2285Pilot-operated systems
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/04Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
    • F15B13/0416Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor with means or adapted for load sensing
    • F15B13/0417Load sensing elements; Internal fluid connections therefor; Anti-saturation or pressure-compensation valves

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  • 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)
  • Fluid-Pressure Circuits (AREA)
  • Operation Control Of Excavators (AREA)

Abstract

PURPOSE: A variable flow control device for heavy construction equipment is provided to stabilize the hydraulic system by restricting drastic fluctuation of flow and pressure supplied to the equipment with preventing counter flow and compensating pressure in changing load pressure of the actuator and pressure of the hydraulic pump. CONSTITUTION: A variable flow control device comprises a logic check valve(8) opening and closing between a parallel passage(6) and supply passages(7A,7B) and having a variable throttle varying the opening area from a hydraulic pump(2) to the supply passages according to movement; a logic control valve(13) opening a passage(17) connected to the parallel passage and a passage(18) connected to a pressure chamber(12) of the logic check valve, and having a control spool switching according to pressure difference between an outlet passage(15) of the logic check valve and an outlet passage(16) of a control valve(4); a piston(21) having an orifice(9) forming pressure with flowing fluid to the pressure chamber; and a valve spring(11) elastically biasing the parallel passage and the supply passages shut off by the predetermined elastic force.

Description

건설중장비용 유량 가변제어장치{hydraulic apparatus for construction heavy equipment}Variable apparatus for construction heavy equipment

본 발명은 굴삭기 등의 유압실린더와 같은 액츄에이터의 부하 및 유압펌프의 부하압력에 관계없이 설정된 유량을 액츄에이터에 일정하게 공급할 수 있도록 한 건설중장비용 유량제어장치에 관한 것이다.The present invention relates to a flow control apparatus for heavy construction equipment that can supply a predetermined flow rate to the actuator irrespective of the load of the actuator such as an hydraulic cylinder such as an excavator and the load pressure of the hydraulic pump.

더욱 상세하게는, 액츄에이터의 부하압력 및 유압펌프의 압력변동이 발생하는 경우에도 역류방지용 체크기능과 압력보상형 유량조절밸브에 의해 액츄에이터에 공급되는 유량 및 압력이 급격하게 변화되는 것을 방지하여 유압시스템의 안정성을 확보할 수 있도록 한 유량제어장치에 관한 것이다.More specifically, even when the load pressure of the actuator and the pressure change of the hydraulic pump occur, the hydraulic system prevents the flow rate and pressure supplied to the actuator from being changed rapidly by the check function for preventing the backflow and the pressure compensation flow control valve. It relates to a flow control device to ensure the stability of the.

도 1 내지 도 3에 도시된 바와 같이, 종래 기술에 의한 유량 가변제어장치는, 펌프통로(5)로 부터 피더통로(7)를 통하여 한쌍의 주가변 스로틀(16A,16B)에 공급되는 작동압의 유량을 제어하고, 한쌍의 부하통로(6A,6B)에 유입되는 작동압의 유량을 보조적으로 제어하는 방향절환밸브(100A,101A)는,1 to 3, the variable flow control apparatus according to the prior art, the operating pressure supplied from the pump passage (5) to the pair of main variable throttles (16A, 16B) through the feeder passage (7) Directional control valves 100A and 101A for controlling the flow rate of the valve and assisting the flow rate of the operating pressure flowing into the pair of load passages 6A and 6B,

하우징(1)내에 이동할 수 있도록 설치되며 피더통로(7)에 보조가변스로틀(28)을 형성하는 시트밸브(300,301)와, 시트밸브(300,301)의 이동량에 따라 개구면적을 변화시키는 제어가변스로틀(28)을 갖는 시트밸브체(20)와,Seat valves 300 and 301 which are installed to move in the housing 1 and form an auxiliary variable throttle 28 in the feeder passage 7, and control variable throttles which change the opening area according to the movement amount of the seat valves 300 and 301 ( A seat valve body 20 having 28),

피더통로(7)의 보조가변스로틀(28)보다 상류측(7C)을 제어가변스로틀(33)을 통하여 피더통로(7)의 하류측(7A,7B)에 연결하고 작동압의 유량에 의해시트밸브체(20)의 이동량을 결정하는 파일럿 라인(24,29∼31,35∼37)과,The upstream side 7C from the auxiliary variable throttle 28 of the feeder passage 7 is connected to the downstream side 7A, 7B of the feeder passage 7 via the control variable throttle 33, and Pilot lines 24, 29 to 31, 35 to 37 for determining the movement amount of the valve body 20,

파일럿 라인(35,36)에 설치된 파일럿 가변스로틀(45) 및 유량제어신호(802,803)에 의해 파일럿 가변스로틀(45)의 개구면적을 변화시켜서 파일럿 라인(35,36)을 흐르는 파일럿 신호압을 제어하는 파일럿 유량제어밸브(400)를 구비하여 구성된다.The pilot variable throttle 45 and the flow control signals 802 and 803 provided in the pilot lines 35 and 36 change the opening area of the pilot variable throttle 45 to control the pilot signal pressure flowing through the pilot lines 35 and 36. It is configured to include a pilot flow control valve 400.

따라서, 파일럿 신호압(P2a,P2b)의 인가에 따라 유량제어밸브(200B)가 도 2의 도면상, 좌측 또는 우측방향으로 절환됨에 따라, 유압펌프(200)로 부터 토출되어 절환된 유량제어밸브(200B)를 경유하여 공급되는 작동압에 의해 액츄에이터(701)를 구동시킬 때, 파일럿 신호압(P1a,P1b)의 인가에 따라 절환되는 유량제어밸브(200A)를 경유하여 액츄에이터(702)에 공급되는 작동압의 유량을 비례적으로 제어할 수 있게 된다.Accordingly, as the flow control valve 200B is switched to the left or right direction in the drawing of FIG. 2 according to the application of the pilot signal pressures P2a and P2b, the flow control valve is discharged from the hydraulic pump 200 and switched. When driving the actuator 701 by the operating pressure supplied via the 200B, the actuator 701 is supplied to the actuator 702 via the flow control valve 200A switched according to the application of the pilot signal pressures P1a and P1b. The flow rate of the working pressure can be controlled proportionally.

그러나, 전술한 파일럿 유량제어밸브(400)가 항시 개방된 초기상태를 유지하게되므로 유압펌프(700)의 토출압력보다 액츄에이터(702)의 유로(6A,6B)측 부하압력이 더 높게 발생하는 경우, 시트밸브(300)의 역류에 의해 액츄에이터(702)에 설정된 작동압이 공급되지않게되어 제어불능으로 사고위험성을 갖게되며, 이를 감안하여 도 4에 도시된 바와 같이, 시트밸브(301)내부에 역류방지 체크밸브(122)를 별도로 설치하였으나, 이또한 역류방지시 응답성이 떨어져 장비의 신뢰도가 떨어지고, 해당 부품수의 증가로 제작이 곤란하여 제작비용이 상승되는 문제점을 갖게 된다.However, when the pilot flow control valve 400 described above maintains the initial state which is always open, the load pressure of the flow paths 6A and 6B of the actuator 702 occurs higher than the discharge pressure of the hydraulic pump 700. By the reverse flow of the seat valve 300, the operating pressure set to the actuator 702 is not supplied, and thus, an accident may occur due to uncontrollability. In view of this, as shown in FIG. 4, the seat valve 301 may be Although the backflow prevention check valve 122 is separately installed, it also has a problem in that the responsiveness during the backflow prevention decreases the reliability of the equipment and the manufacturing cost is increased due to the increase in the number of parts.

또한, 액츄에이터의 부하압력 또는 유압펌프의 토출압력에 따라 액츄에이터에 공급되는 유량이 상이하여 안전상 위험이 발생될 수 있는 문제점을 갖게 된다.In addition, the flow rate supplied to the actuator is different depending on the load pressure of the actuator or the discharge pressure of the hydraulic pump has a problem that may cause a safety risk.

따라서, 본 발명의 목적은, 유압실린더의 구동속도를 제어하는 유량제어밸브를 작동유 흐름방향을 제어하는 컨트롤밸브의 블록내부에 설치하여 부품수를 줄여 원가비용을 절감하고, 컴팩트한 구조로 인해 설계시 레이아웃상의 간섭을 방지하며 협소한 공간에서도 사용할 수 있도록 한 건설중장비용 유량제어장치를 제공하는 것이다.Accordingly, an object of the present invention is to install a flow rate control valve for controlling the driving speed of the hydraulic cylinder inside the block of the control valve for controlling the flow direction of the hydraulic fluid to reduce the number of parts to reduce the cost cost, design due to the compact structure It is to provide a flow control device for heavy construction equipment that prevents interference in city layout and can be used in a narrow space.

본 발명의 다른 목적은, 유압펌프의 토출압력보다 액츄에이터의 부하압력이 높게되어 역류방지 체크기능을 수행할 때 응답성이 뛰어나 신뢰도를 향상시킬 수 있도록 한 건설중장비용 유량제어장치를 제공하는 것이다.It is another object of the present invention to provide a flow control device for heavy construction equipment that has a higher load pressure of an actuator than a discharge pressure of a hydraulic pump, so that the response can be improved and reliability is improved when performing a check flow prevention function.

본 발명의 다른 목적은, 구조를 간단화시켜 제작이 용이하여 제작비용을 낮추며, 유압시스템의 안정성을 확보할 수 있도록 한 가변제어장치를 제공하는 것이다.Another object of the present invention is to provide a variable control device which can simplify the structure to reduce the manufacturing cost and ensure the stability of the hydraulic system.

도 1은 종래 기술에 의한 유량 가변제어장치의 유압회로도,1 is a hydraulic circuit diagram of a variable flow control apparatus according to the prior art,

도 2는 종래 기술에 의한 가변제어장치의 단면도,2 is a cross-sectional view of a variable control apparatus according to the prior art,

도 3은 종래 기술에 의한 시트밸브의 요부발췌도,3 is an excerpt of the main portion of the seat valve according to the prior art,

도 4는 종래 기술에 의한 시트밸브의 다른 변형예시도,Figure 4 is another modified example of the seat valve according to the prior art,

도 5는 본 발명의 일실시예에 의한 유량 가변제어장치의 유압회로도,5 is a hydraulic circuit diagram of a variable flow control apparatus according to an embodiment of the present invention;

도 6은 본 발명의 일실시예에 의한 유량 가변제어장치의 단면도,6 is a cross-sectional view of a variable flow control apparatus according to an embodiment of the present invention,

도 7은 본 발명의 파일럿 압력과 스플개구면적의 관계를 나타내는 그래프 이다.7 is a graph showing the relationship between the pilot pressure and the spool opening area of the present invention.

* 도면중 주요 부분에 사용된 부호의 설명 *Explanation of symbols used in the main part of the drawing

1; 하우징2; 유압펌프One; A housing 2; Hydraulic pump

4; 제어밸브5; 스플4; Control valve 5; Spool

6; 병렬통로7A,7B; 공급통로6; Parallel passages 7A, 7B; Supply passage

8; 로직체크밸브9; 오리피스8; Logic check valve 9; Orifice

12; 압력실13; 로직제어밸브12; Pressure chamber 13; Logic Control Valve

21; 피스톤22; 유량조절밸브체21; Piston 22; Flow control valve body

26; 제어스플26; Control splice

전술한 본 발명의 목적은, 유압펌프와, 유압펌프에 연결되어 작동유 공급시 구동하는 유압실린더와, 유압펌프와 유압실린더사이의 유로에 병렬로 설치되어 유압실린더에 공급되는 작동유의 흐름방향을 제어하는 제어밸브와, 제어밸브의 공급유로와 병렬유로사이의 유로에 설치되는 유량조절밸브체를 구비하는 건설중장비용 유량제어장치에 있어서, 전술한 유량조절밸브체(22)는,The object of the present invention described above is to control the flow direction of the hydraulic pump, the hydraulic cylinder connected to the hydraulic pump and driven when the hydraulic oil is supplied, and the hydraulic oil installed in parallel in the flow path between the hydraulic pump and the hydraulic cylinder and supplied to the hydraulic cylinder. In the flow control apparatus for construction equipment comprising a control valve to be provided, and a flow control valve body provided in a flow path between a supply flow path and a parallel flow path of the control valve, the above-described flow control valve body 22,

병렬유로(6)와 공급유로(7A,7B)사이의 유로에 개폐가능하게 설치되어 이동량에 따라 유압펌프(2)로 부터 공급유로(7A,7B)로의 개구면적을 가변적으로 제어하는 제어가변스로틀(8a)을 갖는 로직체크밸브(8)와,Control variable throttle which is installed to open and close in the flow path between the parallel flow path 6 and the supply flow paths 7A and 7B and variably controls the opening area from the hydraulic pump 2 to the supply flow paths 7A and 7B according to the moving amount. Logic check valve (8) having (8a),

병렬유로(6)와 연결된 유로(17)와 로직체크밸브(8)의 압력실(12)에 연결된 유로(18)를 개폐시키도록 설치되며, 로직체크밸브(8)출구측 유로(15)의 압력에 대한 상기 제어밸브(4)출구측 유로(16)의 압력차에 의해 절환되는 제어스플(26)을 갖는 로직제어밸브(13)와,The flow path 17 connected to the parallel flow path 6 and the flow path 18 connected to the pressure chamber 12 of the logic check valve 8 are opened and closed. A logic control valve 13 having a control spool 26 which is switched by the pressure difference between the control valve 4 and the outlet-side flow path 16 with respect to pressure;

로직체크밸브(8)상단의 압력실(12)에 유입되는 유량으로 압력을 형성하기 위한 오리피스(9)가 형성된 피스톤(21) 및 미리 설정된 탄성력에 의해 병렬유로(6)와 공급유로(7A,7B)를 차단한 것을 초기상태로서 탄성바이어스하는 밸브스프링(11)을 구비하는 것을 특징으로 하는 건설중장비용 유량제어장치를 제공함에 의해 달성된다.The parallel flow path 6 and the supply flow path 7A are formed by a piston 21 having an orifice 9 for forming pressure at a flow rate flowing into the pressure chamber 12 above the logic check valve 8 and a predetermined elastic force. It is achieved by providing a flow control device for heavy construction equipment, characterized in that it comprises a valve spring 11 which elastically biases the blocked state 7B) as an initial state.

이하, 본 발명의 바람직한 실시예를 첨부도면에 따라 상세하게 설명하되, 이는 본 발명이 속하는 기술분야에서 통상의 지식을 가진 자가 용이하게 실시할 수 있도록 상세하게 설명하기 위한 것이지, 이로 인해 본 발명의 기술적인 사상 및 범주가 한정되는 것을 의미하지는 않는 것이다.Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, which are intended to be described in detail so that those skilled in the art to which the present invention pertains can easily carry out the present invention. It does not mean that the technical spirit and scope are limited.

도 5 및 도 6에 도시된 바와 같이, 유압펌프(2)와, 유압펌프(2)에 연결되어 작동유 공급으로 구동하는 유압실린더(3)와, 유압펌프(2)와 유압실린더(3)사이의 유로에 설치되어 유압실린더(3)에 공급되는 작동유의 흐름방향을 제어하는 제어밸브(4)와, 제어밸브(4)의 공급유로(7)와 병렬유로(6)사이의 유로에 설치되는 유량조절밸브체(22)를 구비하는 건설중장비용 유량제어장치에 적용된다.5 and 6, between the hydraulic pump 2, the hydraulic cylinder 3 connected to the hydraulic pump 2 and driven by the hydraulic oil supply, between the hydraulic pump 2 and the hydraulic cylinder 3. The control valve 4 is installed in the flow path of the control valve 4 for controlling the flow direction of the hydraulic oil supplied to the hydraulic cylinder (3), and the flow path between the supply flow path 7 and the parallel flow path 6 of the control valve (4) It is applied to the flow control apparatus for heavy construction equipment provided with the flow control valve body 22.

따라서, 본 발명의 바람직한 실시예에 의하면, 역류방지 체크기능과 압력보상형 유량조절밸브체(22)는, 병렬유로(6)와 공급유로(7A,7B)사이의 유로를 개폐가능하게 설치되어 이동량에 따라 유압펌프(2)로 부터 공급유로(7A,7B)로의 개구면적을 가변적으로 제어하는 제어가변스로틀(8a)과, 하우징(1)내를 이동하는 이동량에 따라 로직체크밸브(8)의 이동량을 제어하고 압력실(12)에 유입되는 유량에 따라 압력을 발생하기위한 오리피스(9)가 형성된 피스톤(21)과, 미리 설정된 탄성력에 의해 병렬유로(6)와 공급유로(7)를 차단한 것을 초기상태로서 탄성바이어스하는 밸브스프링(11)을 포함하는 로직체크밸브(8)와,Therefore, according to a preferred embodiment of the present invention, the non-return check function and the pressure compensation type flow regulating valve body 22 are provided to open and close the flow path between the parallel flow passage 6 and the supply flow passages 7A and 7B. The control variable throttle 8a for variably controlling the opening area from the hydraulic pump 2 to the supply passages 7A and 7B according to the movement amount, and the logic check valve 8 according to the movement amount moving in the housing 1. The piston 21 having an orifice 9 for controlling the amount of movement of the gas and generating pressure according to the flow rate flowing into the pressure chamber 12, and the parallel flow path 6 and the supply flow path 7 by a predetermined elastic force. A logic check valve 8 including a valve spring 11 which elastically biases the blocked one as an initial state,

병렬유로(6)와 연결된 유로(17)와 로직체크밸브(8)의 압력실(12)에 연결된 유로(18)를 개폐시키도록 설치되며, 압력실(13a)에 연결되며 공급유로(7A,7B)내의 압력을 감지하는 로직체크밸브(8)출구측 유로(15)의 압력과, 밸브스프링(14)의 설정된 탄성력 및 압력실(13b)에 연결되며 유압실린더(3)의 부하압력을 감지하는 제어밸브(4)출구측 유로(16)의 압력차에 따라 제어스플(26)이 절환되는 로직제어밸브(13)를 구비한다.It is installed to open and close the flow path 17 connected to the parallel flow path 6 and the flow path 18 connected to the pressure chamber 12 of the logic check valve 8, and is connected to the pressure chamber 13a and the supply flow path 7A, 7B) is connected to the pressure of the outlet side flow path 15 of the logic check valve 8 which senses the pressure in the valve, the set elastic force of the valve spring 14 and the pressure chamber 13b and senses the load pressure of the hydraulic cylinder 3 The control valve 4 is provided with a logic control valve 13 in which the control spurs 26 are switched in accordance with the pressure difference between the outlet side flow path 16.

이때, 공급통로(7A,7B)의 압력을 감지하는 신호압력라인(15)은 로직제어밸브(13)의 압력실(13a)에 연결되고, 유압실린더(3)의 부하압력을 감지하는 부하신호라인(16)은 로직제어밸브(13)의 압력실(13b)에 연결되며, 부하신호압력은 제어밸브(4)의 스플(5)이 중립위치에서는 유로(16A,16B)를 통하여 탱크로 연결되며, 파일럿 압력에 의해 스플(5)이 좌측 또는 우측방향으로 절환되면, 부하통로(24A,24B)의 압력이 유로(16A,16B)를 통하여 부하압력신호라인(16)에 연결되어 부하압력을 감지할 수 있게 된다.At this time, the signal pressure line 15 for sensing the pressure in the supply passages 7A, 7B is connected to the pressure chamber 13a of the logic control valve 13, and the load signal for sensing the load pressure of the hydraulic cylinder 3 The line 16 is connected to the pressure chamber 13b of the logic control valve 13, and the load signal pressure is connected to the tank through the flow paths 16A and 16B at the neutral position of the spool 5 of the control valve 4. When the spool 5 is switched to the left or the right direction by the pilot pressure, the pressure in the load passages 24A and 24B is connected to the load pressure signal line 16 through the flow passages 16A and 16B, thereby reducing the load pressure. It can be detected.

전술한 유로(16)는 제어밸브(4)의 중립위치에서는 탱크(T)로 연결되며, 파일럿 압력의 인가에 따라 제어밸브(4)의 스플(5)이 좌측 또는 우측방향으로 절환되면 오리피스(19;19a,19b)후측에서 부하압력을 감지하도록 형성된다.The aforementioned flow path 16 is connected to the tank T in the neutral position of the control valve 4, and when the spool 5 of the control valve 4 is switched to the left or the right direction according to the application of the pilot pressure, the orifice ( 19; 19a, 19b) are formed to sense the load pressure at the rear side.

전술한 밸브스프링(14)의 탄성력은 신호라인(15,16)의 전후 압력차에 의해 발생하는 힘에 의해 미리 설정값으로 셋팅된 것이다.The elastic force of the valve spring 14 described above is set to a preset value by the force generated by the pressure difference between the front and rear of the signal lines 15 and 16.

이하에서, 본 발명에 의한 건설중장비용 유량제어장치의 작동을 첨부도면을 참조하여 상세하게 설명한다.Hereinafter, the operation of the flow control device for construction equipment according to the present invention will be described in detail with reference to the accompanying drawings.

도 5 및 도 6에 도시된 바와 같이, 파일럿 조작레버(23)를 조작하여 파일럿 신호압 인가에 따라 제어밸브(4)의 스플(5)을 좌측 또는 우측방향으로 설정된 압력으로 절환시키는 경우, 스플(5) 개구부 면적선도의 "A" 파일럿 압력으로 절환하면 절환밸브의 개구 면적은 " A' "로 설정된다.5 and 6, when the pilot operating lever 23 is operated to switch the spool 5 of the control valve 4 to the pressure set in the left or right direction according to the pilot signal pressure application, the spool (5) When switching to the "A" pilot pressure in the opening area diagram, the opening area of the switching valve is set to "A '".

이때, 센터바이패스통로(20)가 차단됨에 따라 유압펌프(P)로 부터 토출되는 작동유는 병렬유로(6) - 로직체크밸브(8) - 공급유로(7A,7B) - 스플(5)의 가변오리피스(19A,19B)를 차례로 통과하여 유압실린더(3)에 공급되어 이를 구동시킬 수 있게 된다.At this time, the operating oil discharged from the hydraulic pump (P) as the center bypass passage (20) is blocked, the parallel passage (6)-logic check valve (8)-supply passage (7A, 7B)-of the spool (5) Passed through the variable orifices (19A, 19B) in order to be supplied to the hydraulic cylinder (3) it can be driven.

이때, 작업조건에 따라 유압실린더(3)에 공급되는 유량을 제한하여 이의 구동속도를 제어하고자하는 경우, 절환밸브를 파일럿 압력 "A"로 절환하여 유량이 통과되는 면적을 " A' "로 설정하면, 통과하는 유량(Q)은, Q = Cd × A × √ΔPAt this time, in order to control the driving speed by limiting the flow rate supplied to the hydraulic cylinder 3 according to the working conditions, the switching valve is switched to the pilot pressure "A" to set the area where the flow rate passes to "A" " When the flow rate Q passes through, Q = Cd × A × √ΔP

(여기서, Cd; 유량계수, A; 오리피스 면적, ΔP; 오리피스 전후 압력차 이다)(Where Cd; flow coefficient, A; orifice area, ΔP; pressure difference before and after orifice)

즉, 통과하는 유량은 오리피스(19A,19B)전후 압력차를 동일하게 유지하면 오리피스 면적에 비례하게 된다.That is, the flow rate passing through is proportional to the orifice area if the pressure difference before and after the orifices 19A and 19B are kept the same.

이때, 스플(5)의 개구면적을 " A' "로 설정하였을때, 즉 스플(5)의 오리피스(19A,19B)를 통과하는 유량이 오리피스(19A,19B) 전후 압력차[제어밸브(4) 입구의 압력 - 유압실린더(3)의 부하압력]가 설정값이하일 경우에는 로직제어밸브(13)는 제어되지않고 중립상태를 유지하게되므로 유량이 제어되지않고 유입된다.At this time, when the opening area of the spool 5 is set to "A", that is, the flow rate passing through the orifices 19A, 19B of the spool 5 before and after the orifices 19A, 19B (control valve 4 When the inlet pressure-the load pressure of the hydraulic cylinder (3) is lower than the set value, the logic control valve 13 is not controlled and is maintained in a neutral state, so the flow rate is not controlled.

한편, 유량이 점진적으로 증가하여 오리피스(19A,19B)전후 압력차가 설정값을 초과하는 경우, 로직제어밸브(13)의 밸브스프링(14)의 탄성력보다 크게되므로 로직제어밸브(13)에 의해 제어압력 입구라인(17)과 제어압력 출구라인(18)이 연결되며, 제어된 작동유가 로직제어밸브 압력실(12)에 도달하게 된다.On the other hand, when the flow rate gradually increases and the pressure difference before and after the orifices 19A and 19B exceeds the set value, it is larger than the elastic force of the valve spring 14 of the logic control valve 13 and controlled by the logic control valve 13. The pressure inlet line 17 and the control pressure outlet line 18 are connected, and the controlled hydraulic oil reaches the logic control valve pressure chamber 12.

로직제어밸브 압력실(12)에 도달한 제어된 작동유는 로직체크밸브(8)의 오리피스(9)를 경유하여 작동유가 공급유로(7A,7B)로 유출된다.The controlled hydraulic fluid reaching the logic control valve pressure chamber 12 flows out into the supply passages 7A and 7B via the orifice 9 of the logic check valve 8.

로직체크밸브(8)의 오리피스(9)에 의해 로직체크밸브(8)의 압력실(12)은 로직제어밸브(13)의 이동량에 따라 유량이 증감되고, 유량의 증감에 따라 로직밸브압력실(12)의 압력은 제어된다.The orifice 9 of the logic check valve 8 causes the pressure chamber 12 of the logic check valve 8 to increase or decrease the flow rate in accordance with the movement amount of the logic control valve 13, and according to the increase or decrease of the flow rate. The pressure at 12 is controlled.

또한, 로직체크밸브(8)는 로직밸브압력실(12)과 시이트부의 면적차이에 의해 로직밸브압력실(12)의 압력에 의해 로직체크밸브(8)는 시이트방향으로 이동하므로 로직체크밸브(8)의 통과면적이 작아지므로 유량이 감소하게 된다.In addition, the logic check valve 8 is moved by the pressure of the logic valve pressure chamber 12 due to the area difference between the logic valve pressure chamber 12 and the sheet portion. Since the passage area of 8) becomes small, the flow rate decreases.

따라서, 스플(5)의 오리피스 면적(" A' ")을 통과하는 유량은 유압실린더(3)의 부하압력 및 유압펌프(2) 압력에 관계없이 항시 일정한 압력차로 통과함에 따라 일정한 유량을 유지할 수 있고, 유압실린더(3)의 부하압력 변동 또는 유압펌프(2)압력이 순간적으로 변동하는 경우에도 유량제어밸브(22)의 이송에 따른 로직체크밸브(8)의 압력실(12)의 압력이 2차로 제어됨에 따라 헌팅 및 유압시스템의 안정을 확보할 수 있게 된다.Therefore, the flow rate passing through the orifice area ("A '") of the spool 5 can maintain a constant flow rate as it passes at a constant pressure difference at all times regardless of the load pressure of the hydraulic cylinder 3 and the pressure of the hydraulic pump 2. In addition, even when the load pressure fluctuation of the hydraulic cylinder 3 or the pressure of the hydraulic pump 2 momentarily fluctuates, the pressure in the pressure chamber 12 of the logic check valve 8 according to the transfer of the flow rate control valve 22 is maintained. The secondary control ensures stability of the hunting and hydraulic systems.

한편, 유압펌프(P) 압력보다 유압실린더(3) 부하압력이 높은 경우에는 로직제어밸브(13)는 차단된 상태이므로 체크밸브의 기능을 수행할 수 있게 된다.On the other hand, when the hydraulic cylinder (3) load pressure is higher than the hydraulic pump (P) pressure, the logic control valve 13 is blocked, it is possible to perform the function of the check valve.

이상에서와 같이, 바람직한 실시예에 의하면 아래와 같은 이점을 갖는다.As mentioned above, according to a preferable embodiment, it has the following advantages.

역류방지용 체크기능과 압력보상형 유량을 조절하는 기능을 동시에 수행하게되어 컴팩트한 구조로 인해 부품수를 줄여 원가비용을 절감하고, 유압회로를 설계시 레이아웃상의 간섭을 방지하며 협소한 공간에서도 사용할 수 있게 된다.The backflow prevention check function and the pressure compensation flow rate control function are performed at the same time, so the cost is reduced by reducing the number of parts due to the compact structure, and the layout of the hydraulic circuit can be prevented and it can be used even in a narrow space. Will be.

작업장치의 부하압력 및 유압펌프의 압력변동에 따른 헌팅 및 쇼크를 감소시켜 해당 부품의 내구성을 향상시킬 수 있다.The durability of the parts can be improved by reducing the hunting and shock caused by the load pressure of the work device and the pressure change of the hydraulic pump.

또한, 유압펌프의 토출압력보다 작업장치의 부하압력이 높게되어 역류방지 체크기능을 수행할 때 응답성이 뛰어나 장비의 신뢰도 및 경쟁력을 높일 수 있다.In addition, the load pressure of the working device is higher than the discharge pressure of the hydraulic pump to improve the reliability and competitiveness of the equipment is excellent in response when performing the check flow prevention check.

Claims (1)

유압펌프와, 유압펌프에 연결되어 작동유 공급시 구동하는 유압실린더와, 유압펌프와 유압실린더사이의 유로에 병렬로 설치되어 유압실린더에 공급되는 작동유의 흐름방향을 제어하는 제어밸브와, 제어밸브의 공급유로와 병렬유로사이의 유로에 설치되는 유량조절밸브체를 구비하는 건설중장비용 유량제어장치에 있어서:A hydraulic valve, a hydraulic cylinder connected to the hydraulic pump and driven when supplying the hydraulic oil, a control valve installed in parallel in the flow path between the hydraulic pump and the hydraulic cylinder to control the flow direction of the hydraulic oil supplied to the hydraulic cylinder, In a flow control apparatus for heavy construction equipment, having a flow control valve body installed in a flow path between a supply flow passage and a parallel flow passage 상기 유량조절밸브체(22)는;The flow control valve body 22; 상기 병렬유로(6)와 공급유로(7A,7B)사이의 유로에 개폐가능하게 설치되어 이동량에 따라 유압펌프(2)로 부터 공급유로(7A,7B)로의 개구면적을 가변적으로 제어하는 제어가변스로틀(8a)을 갖는 로직체크밸브(8);The control variable is installed to open and close in the flow path between the parallel flow path 6 and the supply flow passages 7A and 7B to variably control the opening area from the hydraulic pump 2 to the supply flow passages 7A and 7B according to the movement amount. A logic check valve 8 having a throttle 8a; 상기 병렬유로(6)와 연결된 유로(17)와 로직체크밸브(8)의 압력실(12)에 연결된 유로(18)를 개폐시키도록 설치되며, 로직체크밸브(8)출구측 유로(15)의 압력에 대한 상기 제어밸브(4)출구측 유로(16)의 압력차에 의해 절환되는 제어스플(26)을 갖는 로직제어밸브(13); 및The flow path 17 connected to the parallel flow path 6 and the flow path 18 connected to the pressure chamber 12 of the logic check valve 8 are installed to open and close, and the flow path 15 of the logic check valve 8 exits. A logic control valve (13) having a control spline (26) switched by the pressure difference of the control valve (4) outlet side flow passage (16) with respect to the pressure of the control valve (4); And 상기 로직체크밸브(8)상단의 압력실(12)에 유입되는 유량으로 압력을 형성하기위한 오리피스(9)가 형성된 피스톤(21) 및 미리 설정된 탄성력에 의해 병렬유로(6)와 공급유로(7A,7B)를 차단한 것을 초기상태로서 탄성바이어스하는 밸브스프링(11)을 구비하는 것을 특징으로 하는 건설중장비용 유량제어장치.The parallel passage 6 and the supply passage 7A are formed by a piston 21 having an orifice 9 for forming pressure at a flow rate flowing into the pressure chamber 12 above the logic check valve 8 and a predetermined elastic force. And a valve spring (11) which elastically biases as an initial state to block 7B).
KR1020010082744A 2001-12-20 2001-12-21 hydraulic apparatus for construction heavy equipment KR100631064B1 (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
KR1020010082744A KR100631064B1 (en) 2001-12-21 2001-12-21 hydraulic apparatus for construction heavy equipment
US10/247,556 US6675904B2 (en) 2001-12-20 2002-09-19 Apparatus for controlling an amount of fluid for heavy construction equipment
JP2002280457A JP3822156B2 (en) 2001-12-20 2002-09-26 Oil quantity control device for heavy construction equipment
GB0222644A GB2383383B (en) 2001-12-20 2002-09-30 Apparatus for controlling an amount of fluid for heavy construction equipment
CNB021468559A CN1285837C (en) 2001-12-20 2002-10-15 Device for controlling flow in heavy construction equipment
ITMI20022311 ITMI20022311A1 (en) 2001-12-20 2002-10-30 DEVICE TO CHECK THE QUANTITY OF FLUID FOR
DE10250466A DE10250466B4 (en) 2001-12-20 2002-10-30 Hydraulic control valve device for use on construction machinery
FR0214244A FR2834018B1 (en) 2001-12-20 2002-11-14 DEVICE FOR MONITORING A QUANTITY OF FLUID INTENDED FOR HEAVY CONSTRUCTION MACHINERY

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KR1020010082744A KR100631064B1 (en) 2001-12-21 2001-12-21 hydraulic apparatus for construction heavy equipment

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KR20030052716A true KR20030052716A (en) 2003-06-27
KR100631064B1 KR100631064B1 (en) 2006-10-02

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Cited By (5)

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KR100814500B1 (en) * 2007-04-02 2008-03-18 주식회사 파카한일유압 Parallel line improvement direct connection variable control valve of composition operation
KR20120072519A (en) * 2010-12-24 2012-07-04 두산인프라코어 주식회사 Flow variable controller apparatus
KR101421727B1 (en) * 2007-11-01 2014-07-24 두산인프라코어 주식회사 Bucket sudden drop prevention apparatus for construction machinery
WO2015023010A1 (en) * 2013-08-13 2015-02-19 볼보 컨스트럭션 이큅먼트 에이비 Flow control valve for construction equipment
KR20150111861A (en) * 2014-03-26 2015-10-06 가부시키가이샤 고베 세이코쇼 Steel bar transmission apparatus

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US5213534A (en) * 1992-07-31 1993-05-25 Molex Incorporated Electrical connector assembly for flat flexible cable
KR950002378A (en) * 1993-06-17 1995-01-04 이헌조 Two-way scanning TV transmission system
KR100559233B1 (en) * 1998-09-30 2006-08-10 볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비 Pressure compensation flow control valve

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100814500B1 (en) * 2007-04-02 2008-03-18 주식회사 파카한일유압 Parallel line improvement direct connection variable control valve of composition operation
KR101421727B1 (en) * 2007-11-01 2014-07-24 두산인프라코어 주식회사 Bucket sudden drop prevention apparatus for construction machinery
KR20120072519A (en) * 2010-12-24 2012-07-04 두산인프라코어 주식회사 Flow variable controller apparatus
WO2015023010A1 (en) * 2013-08-13 2015-02-19 볼보 컨스트럭션 이큅먼트 에이비 Flow control valve for construction equipment
KR20150111861A (en) * 2014-03-26 2015-10-06 가부시키가이샤 고베 세이코쇼 Steel bar transmission apparatus

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