KR20010010461A - Direction converter valve integrated with anti-drop valve - Google Patents

Direction converter valve integrated with anti-drop valve Download PDF

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Publication number
KR20010010461A
KR20010010461A KR1019990029351A KR19990029351A KR20010010461A KR 20010010461 A KR20010010461 A KR 20010010461A KR 1019990029351 A KR1019990029351 A KR 1019990029351A KR 19990029351 A KR19990029351 A KR 19990029351A KR 20010010461 A KR20010010461 A KR 20010010461A
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South Korea
Prior art keywords
valve
logic
drop
cylinder
oil
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KR1019990029351A
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Korean (ko)
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KR100348129B1 (en
Inventor
송영복
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토니헬샴
볼보건설기계코리아 주식회사
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Priority to KR1019990029351A priority Critical patent/KR100348129B1/en
Publication of KR20010010461A publication Critical patent/KR20010010461A/en
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Publication of KR100348129B1 publication Critical patent/KR100348129B1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B39/00—Evaporators; Condensers
    • F25B39/04—Condensers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2339/00—Details of evaporators; Details of condensers
    • F25B2339/04—Details of condensers
    • F25B2339/044—Condensers with an integrated receiver
    • F25B2339/0441—Condensers with an integrated receiver containing a drier or a filter
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2339/00—Details of evaporators; Details of condensers
    • F25B2339/04—Details of condensers
    • F25B2339/044—Condensers with an integrated receiver
    • F25B2339/0446—Condensers with an integrated receiver characterised by the refrigerant tubes connecting the header of the condenser to the receiver; Inlet or outlet connections to receiver

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

PURPOSE: A direction converting valve is provided to save space while reducing the number of components by integrating an anti-drop valve to the direction converting valve. CONSTITUTION: Oil from a pump(P) is inputted to a direction converting valve unit(3) through a check valve(15). If a pilot pressure is applied through a port(a), oil is inputted into a small chamber of a cylinder(5) through a left line. If not so, oil is inputted into a logic valve() through a right line and the logic valve is opened for inputting the oil to the small chamber. An upper Part of the logic valve is connected with a control valve(7). If the pilot pressure is applied to the control valve, the control valve is moved for closing the logic valve. Herein, an anti-drop valve unit composed of the logic/control valves is integrated with the direction converting valve unit.

Description

안티 드롭 밸브가 일체된 방향 전환 밸브{Direction converter valve integrated with anti-drop valve}Direction converter valve with integrated anti drop valve

본 발명은 굴삭기의 작업 장치의 작동 방향을 제어하기 위하여 사용하는 방향 전환 밸브에 관한 것으로, 구체적으로는 작업 장치의 실린더를 팽창시키거나 수축시키기 위하여 사용하는 방향 전환 밸브에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a directional valve for use in controlling an operating direction of an excavator's working device, and more particularly, to a directional valve for expanding or contracting a cylinder of a working device.

일반적으로, 굴삭기 등의 작업 장치는 복수의 링크 사이에 실린더가 설치되어 있어, 이 실린더의 수축 또는 팽창에 의하여 움직이면서 소정의 작업을 행한다. 이와 같은 작업 장치는 통상 매우 무거우며, 유압 회로의 이상이나 연결 호스의 파열 등이 발생할 경우 갑자기 낙하하여 인명 사고 또는 작업 환경을 손상시킨다. 따라서, 작업 장치의 갑작스런 낙하를 방지하기 위하여 도 1 과 같이 실린더(5)에 안티 드롭 밸브(1)를 직접 연결시키고 있으며, 이와는 별도로 방향 전환 밸브(3)가 제공되어, 안트 드롭 밸브(1)에 오일을 공급한다.In general, a working device such as an excavator is provided with a cylinder between a plurality of links, and performs a predetermined work while moving by contraction or expansion of the cylinder. Such a working device is usually very heavy, and suddenly falls in case of an abnormality in the hydraulic circuit or a rupture of the connecting hose, thereby damaging a human accident or a work environment. Therefore, in order to prevent the sudden drop of the work device, the anti-drop valve 1 is directly connected to the cylinder 5 as shown in FIG. 1, and a directional valve 3 is provided separately from the ant drop valve 1. Supply oil.

그러나, 이와 같이 안티 드롭 밸브를 별도로 설치하면, 공간을 많이 차지할 뿐만 아니라, 부품 수의 증가에 따라 생산 단가가 상승하고, 정비가 복잡해지는 단점이 있다.However, if the anti-drop valve is separately installed in this way, not only does it take up a lot of space, but also the production cost increases as the number of parts increases, and maintenance has a disadvantage.

따라서, 본 발명에서는 방향 전환 밸므에 안티 드롭 밸브를 일체시켜, 공간을 절약하고, 부품 수를 감소시키는 것을 목적으로 한다.Therefore, an object of the present invention is to integrate an anti-drop valve in the direction change valve to save space and reduce the number of parts.

도 1 은 안티 드롭 밸브와 방향 전환 밸브가 분리된 종래의 유압 회로를 개략적으로 나타내는 도면이다.1 is a view schematically showing a conventional hydraulic circuit in which an anti-drop valve and a directional valve are separated.

도 2 는 본 발명의 일 실시예에 따른 방향 전환 밸브의 일 실시예를 나타내는 도면이다.2 is a view showing an embodiment of a directional valve according to an embodiment of the present invention.

본 발명의 이러한 목적은, 실린더를 팽창시키거나 수축시키기 위하여 유압의 방향을 제어하는 방향 전환 밸브에 있어서, 유압 회로에 파열되었을 때 작업 장치가 급강하되는 현상을 방지하기 위한 안티 드롭 밸브가 일체된 방향 전환 밸브에 의하여 달성된다.It is an object of the present invention to provide a direction switching valve for controlling the direction of hydraulic pressure to inflate or deflate a cylinder, in which the anti-drop valve is integrated to prevent the work device from falling when the hydraulic circuit is ruptured. Achieved by a switching valve.

바람직하게, 상기 방향 전환 밸브의 안티 드롭 밸브는 상기 실린더에 직결되어 실린더와 연결된 호스 사이에 누수가 발생할 가능성을 제거한다.Preferably, the anti drop valve of the diverter valve is directly connected to the cylinder, eliminating the possibility of leaks between the cylinder and the connected hose.

바람직하게, 상기 안트 드롭 밸브는 실린더에 연결된 유로에 접속된 로직 밸브, 상기 로직 밸브의 개방 압력을 조절하기 위한 제어 밸브를 구비한다.Preferably, the ant drop valve has a logic valve connected to a flow path connected to a cylinder, and a control valve for regulating the opening pressure of the logic valve.

이하에서는 본 발명의 일 실시예를 도면과 관련하여 설명하도록 하지만, 본 발명의 기술적 범위가 이 실시예로 한정되는 것으로 해석해서는 안된다.Hereinafter, one embodiment of the present invention will be described with reference to the drawings, but the technical scope of the present invention should not be construed as being limited to this embodiment.

도 2에서는 본 발명에 따른 방향 전환 밸브의 일 실시예를 도시하고 있다. 본 실시예에서, 펌프(P)로부터의 오일은 체크 밸브(15)를 통과하여 방향 전환 밸브부(3)로 들어간다. 만약 파일롯 압력이 포트(a)를 통하여 가해졌다면, 오일은 왼쪽 라인을 타고 실린더(5)의 스몰 쳄버로 들어가게 되며, 파일롯 압력이 포트(b)를 통해 가해졌다면, 오일은 오른쪽 라인을 타고 로직 밸브(9)로 들어가게 된다. 포트(b)로 압력이 파일롯 압력이 가해졌을 때에는 오일이 로직 밸브(9)의 하부에 압력을 가하여 로직 밸브(9)를 개방시키면서 실린더(5)의 스몰 챔버로 들어간다.Figure 2 shows an embodiment of a directional valve according to the present invention. In this embodiment, the oil from the pump P passes through the check valve 15 and enters the directional valve section 3. If pilot pressure is applied through port (a), oil will enter the small chamber of cylinder (5) in the left line, and if pilot pressure is applied through port (b), oil will flow in the right line and the logic valve You will enter (9). When a pilot pressure is applied to the port b, oil enters the small chamber of the cylinder 5 while pressing the lower portion of the logic valve 9 to open the logic valve 9.

로직 밸브(9)의 상부는 제어 밸브(7)에 접속되어 있다. 제어 밸브(7)에 파일롯 압력(Pi)이 가해지지 않을 때에는 도면과 같은 상태를 유지하면서 로직 밸브(9)에 압력을 가하지 않지만, 파일롯 압력(Pi)이 제어 밸브(7)에 가해지면 제어 밸브(7)가 오른쪽으로 이동하면서 Pg2의 오일이 체크 밸브(17)을 통과한 뒤 로직 밸브(9)의 상부에 압력을 가하여 로직 밸브(9)를 폐쇄시킨다.The upper portion of the logic valve 9 is connected to the control valve 7. When the pilot pressure Pi is not applied to the control valve 7, the pressure is not applied to the logic valve 9 while maintaining the state as shown in the drawing, but when the pilot pressure Pi is applied to the control valve 7, the control valve As (7) moves to the right, the oil of Pg2 passes through the check valve 17 and pressurizes the top of the logic valve 9 to close the logic valve 9.

전술한 바와 같이, 압력이 포트(a)로 가해졌을 때에는 실린더(5)의 라지 챔버의 오일이 유로를 타고 로직 밸브(9)로 흘러간다. 이때 파일럿 압력(Pi)이 제어 밸브(7)에 가해져 있으면, 로직 밸브(9)의 상부에 Pg2로부터의 오일에 의한 압력이 가해져서 로직 밸브(9)가 소통되지 않지만, 파일럿 압력(Pi)가 가해지지 않으면, 오일의 압력이 로직 밸브(9)의 하부에 압력을 가하면서 로직 밸브(9)를 개방시키고 탱크(T)로 흘러가게 된다.As described above, when pressure is applied to the port a, the oil in the large chamber of the cylinder 5 flows through the flow path to the logic valve 9. At this time, if the pilot pressure Pi is applied to the control valve 7, the pressure from the oil from Pg2 is applied to the upper portion of the logic valve 9 so that the logic valve 9 does not communicate, but the pilot pressure Pi is If not applied, the oil pressure opens the logic valve 9 and flows to the tank T while applying pressure to the bottom of the logic valve 9.

한편, 방향 전환부(3)와 실린더 사이에는 과부하시 압력을 배출하기 위한 릴리프 밸브(11)(13)와 체크 밸브(12,14)가 설치되어 있다.On the other hand, relief valves 11 and 13 and check valves 12 and 14 for discharging pressure during overload are provided between the direction change section 3 and the cylinder.

본 실시예에서는 로직 밸브(9)와 제어 밸브(7)로 구성되는 안티 드롭 밸브부가 방향 전환 밸브부(3)와 일체되어 있다.In the present embodiment, the anti-drop valve portion composed of the logic valve 9 and the control valve 7 is integrated with the direction switching valve portion 3.

기타의 작동 관계는 통상의 안티 드롭 밸브와 동일하므로 구체적인 설명을 생략하도록 한다.Other operation relations are the same as the conventional anti-drop valve, so detailed description thereof will be omitted.

본 발명에 따른 방향 전환 밸브는 종래의 방향 전환 밸브와 달리 안티 밸브부가 일체되어 있어, 부품의 수를 감소시켜 생산 단가를 낮출뿐만 아니라, 정비가 용이하다는 효과가 있다.Unlike the conventional directional valve, the directional valve according to the present invention has an anti-valve unit integrated, thereby reducing the number of parts and lowering the production cost, and has an effect of easy maintenance.

Claims (3)

실린더를 팽창시키거나 수축시키기 위하여 유압의 방향을 제어하는 방향 전 환 밸브에 있어서,In the direction switching valve for controlling the direction of the hydraulic pressure to expand or contract the cylinder, 유압 회로에 파열되었을 때 작업 장치가 급강하되는 현상을 방지하기 위한 안티 드롭 밸브가 일체된 것을 특징으로 하는 방향 전환 밸브Directional switching valve, characterized in that the anti-drop valve is integrated to prevent the work device from falling when the hydraulic circuit ruptures 제 1 항에 있어서, 상기 방향 전환 밸브의 안티 드롭 밸브는 상기 실린더에 직결되는 것을 특징으로 하는 방향 전환 밸브.2. The directional valve according to claim 1, wherein the anti-drop valve of the directional valve is directly connected to the cylinder. 제 2 항에 있어서, 상기 안트 드롭 밸브는 실린더에 연결된 유로에 접속된 로직 밸브, 상기 로직 밸브의 개방 압력을 조절하기 위한 제어 밸브를 구비하는 것을 특징으로 하는 방향 전환 밸브.3. The directional valve according to claim 2, wherein the ant drop valve includes a logic valve connected to a flow path connected to a cylinder, and a control valve for adjusting an opening pressure of the logic valve.
KR1019990029351A 1999-07-20 1999-07-20 direction converter valve integrated KR100348129B1 (en)

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KR1019990029351A KR100348129B1 (en) 1999-07-20 1999-07-20 direction converter valve integrated

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KR1019990029351A KR100348129B1 (en) 1999-07-20 1999-07-20 direction converter valve integrated

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KR100348129B1 KR100348129B1 (en) 2002-08-09

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101867525B1 (en) * 2017-11-20 2018-07-17 황종원 Anti drop valve

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101867525B1 (en) * 2017-11-20 2018-07-17 황종원 Anti drop valve

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Publication number Publication date
KR100348129B1 (en) 2002-08-09

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