KR100849500B1 - double check valve with floating function - Google Patents

double check valve with floating function Download PDF

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Publication number
KR100849500B1
KR100849500B1 KR1020060119035A KR20060119035A KR100849500B1 KR 100849500 B1 KR100849500 B1 KR 100849500B1 KR 1020060119035 A KR1020060119035 A KR 1020060119035A KR 20060119035 A KR20060119035 A KR 20060119035A KR 100849500 B1 KR100849500 B1 KR 100849500B1
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South Korea
Prior art keywords
check valve
hydraulic cylinder
flow path
control valve
double check
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KR1020060119035A
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Korean (ko)
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KR20080048711A (en
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박성복
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볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비
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Priority to KR1020060119035A priority Critical patent/KR100849500B1/en
Priority to US11/825,637 priority patent/US20080121101A1/en
Priority to EP07014738A priority patent/EP1927759A1/en
Priority to CNA2007101371672A priority patent/CN101191506A/en
Priority to JP2007284674A priority patent/JP2008138870A/en
Publication of KR20080048711A publication Critical patent/KR20080048711A/en
Application granted granted Critical
Publication of KR100849500B1 publication Critical patent/KR100849500B1/en

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    • 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
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • F15B11/024—Systems essentially incorporating special features for controlling the speed or actuating force of an output member by means of differential connection of the servomotor lines, e.g. regenerative circuits
    • 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
    • F15B13/01—Locking-valves or other detent i.e. load-holding devices
    • 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
    • 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
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/30505—Non-return valves, i.e. check valves
    • F15B2211/3051—Cross-check valves
    • 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
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/30525—Directional control valves, e.g. 4/3-directional control valve
    • 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
    • F15B2211/30—Directional control
    • F15B2211/31—Directional control characterised by the positions of the valve element
    • F15B2211/3105—Neutral or centre positions
    • F15B2211/3111—Neutral or centre positions the pump port being closed in the centre position, e.g. so-called closed centre
    • 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
    • F15B2211/30—Directional control
    • F15B2211/31—Directional control characterised by the positions of the valve element
    • F15B2211/3122—Special positions other than the pump port being connected to working ports or the working ports being connected to the return line
    • F15B2211/3127—Floating position connecting the working ports and the return line
    • 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
    • F15B2211/30—Directional control
    • F15B2211/315—Directional control characterised by the connections of the valve or valves in the circuit
    • F15B2211/3157—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source, an output member and a return line
    • F15B2211/31576—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source, an output member and a return line having a single pressure source and a single output member
    • 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
    • F15B2211/30—Directional control
    • F15B2211/32—Directional control characterised by the type of actuation
    • F15B2211/327—Directional control characterised by the type of actuation electrically or electronically
    • 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
    • F15B2211/30—Directional control
    • F15B2211/32—Directional control characterised by the type of actuation
    • F15B2211/329—Directional control characterised by the type of actuation actuated by fluid 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
    • F15B2211/30—Directional control
    • F15B2211/35—Directional control combined with flow control

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Check Valves (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Operation Control Of Excavators (AREA)
  • Valve Device For Special Equipments (AREA)

Abstract

더블 체크밸브가 구비된 유압실린더에 의해 구동되는 작업장치(일예로서, 도자 블레이드가 사용됨)가 작업면을 평평하게 고르는 정지작업 등을 하게되는 경우 플로팅 기능을 수행할 수 있도록 한 것으로,When a work device driven by a hydraulic cylinder equipped with a double check valve (for example, a ceramic blade is used) performs a stopping operation to even the work surface, the floating function may be performed.

본 발명에 의한 플로팅 기능이 구비된 더블 체크밸브는, 유압펌프와,Double check valve with a floating function according to the present invention, the hydraulic pump,

유압펌프에 연결되고, 작업장치를 구동시키는 유압실린더와,A hydraulic cylinder connected to the hydraulic pump and driving the work device;

유압펌프와 유압실린더사이의 유로에 설치되고, 절환시 유압실린더의 기동, 정지 및 방향전환을 제어하는 콘트롤밸브와,A control valve installed in the flow path between the hydraulic pump and the hydraulic cylinder and controlling the start, stop and direction change of the hydraulic cylinder at the time of switching;

콘트롤밸브와 유압실린더사이의 유로를 개폐하도록 설치되고, 외부로부터의 신호압 공급시 서로 반대방향으로 절환되도록 분할형성되는 한쌍의 플런저와, 플런저의 절환에 의해 가압되어 체크기능이 각각 해제되는 한쌍의 체크밸브를 구비하는 더블 체크밸브를 포함하며,It is installed to open and close the flow path between the control valve and the hydraulic cylinder, a pair of plunger is formed to be switched in the opposite direction when supplying the signal pressure from the outside, and a pair of pressurized by the switching of the plunger to release the check function, respectively A double check valve having a check valve,

콘트롤밸브를 중립상태로 절환시키고 작업장치의 플로팅 기능모드를 선택하는 경우, 더블 체크밸브에 의해 유압실린더의 헤드측 챔버와 로드측 챔버를 상호 연통시킨다.When switching the control valve to the neutral state and selecting the floating function mode of the work equipment, the head side chamber and the rod side chamber of the hydraulic cylinder are mutually connected by the double check valve.

플로팅 기능, 더블 체크밸브 Floating function, double check valve

Description

플로팅 기능이 구비된 더블 체크밸브{double check valve with floating function}Double check valve with floating function

도 1은 작업장치의 플로팅 기능을 설명하기 위한 도면,1 is a view for explaining the floating function of the work device,

도 2는 종래 기술에 의해 더블 체크밸브가 적용되는 건설장비의 개략도,Figure 2 is a schematic diagram of construction equipment to which the double check valve is applied by the prior art,

도 3은 도 2에 도시된 콘트롤밸브의 중립시 더블 체크밸브의 사용상태도,3 is a state diagram of use of the double check valve when the control valve shown in FIG.

도 4는 도 2에 도시된 콘트롤밸브의 절환시 더블 체크밸브의 사용상태도,4 is a state diagram used of the double check valve at the time of switching of the control valve shown in FIG.

도 5는 도 2에 도시된 콘트롤밸브의 절환시 더블 체크밸브의 사용상태도,5 is a state of use of the double check valve at the time of switching of the control valve shown in FIG.

도 6은 본 발명의 일 실시예에 의한 플로팅 기능이 구비된 더블 체크밸브의 단면도,6 is a cross-sectional view of a double check valve with a floating function according to an embodiment of the present invention,

도 7은 도 6에 도시된 콘트롤밸브의 절환시 더블 체크밸브의 사용상태도,7 is a state of use of the double check valve at the time of switching of the control valve shown in FIG.

도 8은 도 6에 도시된 콘트롤밸브의 절환시 더블 체크밸브의 사용상태도,8 is a state of use of the double check valve at the time of switching of the control valve shown in FIG.

도 9는 도 6에 도시된 콘트롤밸의 중립시 더블 체크밸브의 사용상태도이다.9 is a state diagram of the use of the double check valve when the control valve shown in FIG.

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

a; 콘트롤밸브a; Control valve

b,c; 체크밸브b, c; Check valve

d; 유압실린더d; Hydraulic cylinder

e1; 제1탄성부재e1; First elastic member

e2; 제2탄성부재e2; Second elastic member

f1,f2; 가압편f1, f2; Pressing piece

h1,h2; 플런저h1, h2; plunger

j; 신호압 통로j; Signal pressure

k; 더블 체크밸브k; Double check valve

P; 유압펌프P; Hydraulic pump

s1,s3; 제1유로s1, s3; Euro 1

s2,s4; 제2유로s2, s4; 2nd euro

본 발명은 작업면의 정지작업 등에 사용되는 작업장치(일예로서, 도자 블레이드가 사용됨)가 플로팅 기능을 수행할 수 있는 플로팅 기능이 구비된 더블 체크밸브에 관한 것이다.The present invention relates to a double check valve with a floating function that can be performed by a work device (for example, a ceramic blade is used) used for stopping work of the working surface and the like.

전술한 "플로팅(floating)" 기능은 유압펌프로부터의 작동유가 작업장치(일예로서, 도자 블레이드를 말함)를 구동시키는 유압실린더에 공급이 일시적으로 차단된 상태에서, 무부하 상태(유압실린더의 헤드측 챔버와 로드측 챔버가 서로 연통된 상태를 말함)의 작업장치가 작업장의 작업면 또는 노면의 굴곡정도에 따라 구동되는 것을 의미한다.The above-mentioned "floating" function allows the hydraulic oil from the hydraulic pump to be temporarily cut off to supply a hydraulic cylinder for driving a work device (for example, a ceramic blade), and in a no-load state (head side of the hydraulic cylinder). It means that the working device of the chamber and the rod-side chamber is in communication with each other is driven according to the degree of bending of the working surface or road surface of the workplace.

도 1에 도시된 바와 같이, 유압실린더(d)의 헤드측 챔버(d1)와 로드측 챔버(d2)가 배관(h)에 의해 연통되도록 연결된다. 이로 인해 작업장치(f)를 장착한 장비가 요철면의 지면(g)을 따라 주행할 경우, 지면(g)이 내리막길인 구간에서는 작업장치(f)가 자중에 의해 하강되므로 유압실린더(d)는 신장구동된다. 반면에 지면(g)이 오르막길인 구간에서는 유압실린더(d)는 수축구동된다.As shown in FIG. 1, the head side chamber d1 and the rod side chamber d2 of the hydraulic cylinder d are connected to communicate with each other by a pipe h. Therefore, when the equipment equipped with the work device f travels along the surface g of the uneven surface, the hydraulic device d is lowered by the own weight in the section where the ground g is downhill. Is stretched. On the other hand, in the section where the ground surface g is uphill, the hydraulic cylinder d is contracted and driven.

즉, 작업장치(f)를 구동시키는 유압실린더(d)에 유압펌프로 부터 작동유가 공급되지않는 경우에도 작업장치(f)가 지면의 요철정도에 따라 반복하여 구동된다.That is, even when hydraulic oil is not supplied from the hydraulic pump to the hydraulic cylinder d for driving the working device f, the working device f is repeatedly driven according to the degree of irregularities of the ground.

도 2 내지 도 5에 도시된 바와 같이, 종래 기술에 의한 더블 체크밸브가 적용되는 건설장비는, 유압펌프(P)와,2 to 5, the construction equipment to which the double check valve according to the prior art is applied, the hydraulic pump (P),

유압펌프(P)에 연결되고, 도자 블레이드(f)를 구동시키는 유압실린더(d)와,A hydraulic cylinder (d) connected to the hydraulic pump (P) and driving the ceramic blade (f);

유압펌프(P)와 유압실린더(d)사이의 유로에 설치되고, 절환시 유압실린더(d)의 기동, 정지 및 방향전환을 제어하는 콘트롤밸브(a)와,A control valve (a) installed in the flow path between the hydraulic pump (P) and the hydraulic cylinder (d), for controlling the start, stop, and direction change of the hydraulic cylinder (d) during switching;

콘트롤밸브(a)와 유압실린더(d)사이의 유로를 개폐하도록 설치되고, 제1,2탄성부재(e1,e2)(압축코일스프링이 사용됨)에 의해 탄성지지된 가압편(f1,f2)에 의해 각각 지지되는 한쌍의 체크밸브(b,c)와, 체크밸브(b,c)사이에 슬라이딩이동가능하게 내설된 플런저(h)에 의해 도자 블레이드(f)의 침하되는 것을 방지하는 더블 체 크밸브(k)를 포함한다.Pressure pieces f1 and f2 which are installed to open and close the flow path between the control valve a and the hydraulic cylinder d, and are elastically supported by the first and second elastic members e1 and e2 (compression coil springs are used). Double sieves for preventing the sinking of the ceramic blade f by a pair of check valves b and c supported by the plunger h and a plunger h slidably moved between the check valves b and c, respectively. Check valve (k).

도 3에 도시된 바와 같이, 전술한 콘트롤밸브(a)가 중립상태를 유지하는 경우, 제1,2탄성부재(e1,e2) 및 가압편(f1,f2)에 의해 각각 탄성지지된 체크밸브(b,c)에 의해 더블 체크밸브(k)가 체크밸브의 기능을 수행한다.As shown in FIG. 3, when the above-described control valve a maintains a neutral state, the check valve elastically supported by the first and second elastic members e1 and e2 and the pressing pieces f1 and f2, respectively. The double check valve k performs the function of the check valve by (b, c).

즉, 체크밸브(b)에 의해 콘트롤밸브(a)와 유압실린더(d)의 로드측 챔버(d2)를 상호 연통시키는 제1유로(s1,s3)를 차단하고, 전술한 체크밸브(c)에 의해 콘트롤밸브(a)와 유압실린더(d)의 헤드측 챔버(d1)를 상호 연통시키는 제2유로(s2,s4)를 차단한다.That is, the check valve (b) blocks the first flow paths s1 and s3 communicating with the control valve a and the rod side chamber d2 of the hydraulic cylinder d, and the check valve c described above. As a result, the second flow paths s2 and s4 communicating with the control valve a and the head side chamber d1 of the hydraulic cylinder d are blocked.

이로 인해, 유압펌프(P)로부터의 작동유가 유압실린더(d)에 공급되지않는다. 또한 유압실린더(d)로부터의 작동유가 유압탱크로 귀환되지않는다.For this reason, the hydraulic oil from the hydraulic pump P is not supplied to the hydraulic cylinder d. Also, the hydraulic oil from the hydraulic cylinder d does not return to the hydraulic tank.

따라서, 도자 블레이드(f)의 침하되는 것을 방지할 수 있다.Therefore, the settlement of the ceramic blade f can be prevented.

도 4에 도시된 바와 같이, 외부로 부터 공급되는 신호압에 의해 콘트롤밸브(a)가 도면상, 우측방향으로 절환되는 경우, 유압펌프(P)로부터의 작동유는 콘트롤밸브(a)를 경유하여 더블 체크밸브(k)의 제1유로(s1)에 유입된다.As shown in FIG. 4, when the control valve a is switched to the right in the drawing by the signal pressure supplied from the outside, the hydraulic oil from the hydraulic pump P passes through the control valve a. It flows into the 1st flow path s1 of the double check valve k.

전술한 제1유로(s1)의 작동유가 수압부(n1)에 작용하여 플런저(h)를 도면상, 좌측방향으로 절환시키고, 체크밸브(b)를 도면상, 우측방향으로 가압하여 이의 체크기능을 해제시킨다(이때 제1탄성부재(e1)는 압축력을 받는다). 즉 체크밸브(k)의 제1유로(s1,s3)를 상호 연통시킨다.The hydraulic fluid of the first flow path s1 described above acts on the hydraulic pressure unit n1 to switch the plunger h to the left in the drawing, and press the check valve b to the right in the drawing to check its function. Release (the first elastic member e1 receives a compressive force). That is, the first flow paths s1 and s3 of the check valve k communicate with each other.

이때, 플런저(h)의 절환으로 인해 체크밸브(c)를 도면상, 좌측방향으로 가압하여 이의 체크기능을 해제시킨다(이때 제2탄성부재(e2)는 압축력을 받는다). 즉 체크밸브(k)의 제2유로(s2,s4)를 상호 연통시킨다.At this time, due to the switching of the plunger h, the check valve c is pressed in the left direction in the drawing to release its check function (the second elastic member e2 receives a compressive force at this time). That is, the second flow paths s2 and s4 of the check valve k communicate with each other.

이로 인해, 유압펌프(P)로부터의 작동유가 콘트롤밸브(a)와, 체크밸브(k)의 제1유로(s1,s3)를 차례로 통과하여 유압실린더(d)의 로드측 챔버(d2)에 공급된다. 이때 유압실린더(d)의 헤드측 챔버(d1)로 부터 배출되는 작동유는 체크기능이 해제된 체크밸브(c)와, 체크밸브(k)의 제2유로(s2,s4)와, 콘트롤밸브(a)를 차례로 통과하여 유압탱크로 귀환된다.Thus, the hydraulic oil from the hydraulic pump P passes through the control valve a and the first flow paths s1 and s3 of the check valve k in order to the rod side chamber d2 of the hydraulic cylinder d. Supplied. At this time, the hydraulic oil discharged from the head side chamber (d1) of the hydraulic cylinder (d) is the check valve (c), the check function is released, the second flow path (s2, s4) of the check valve (k), the control valve ( Pass a) one by one and return to the hydraulic tank.

따라서, 유압실린더(d)는 유압펌프(P)로 부터 공급되는 작동유에 의해 수축구동된다.Therefore, the hydraulic cylinder d is shrink-driven by the hydraulic oil supplied from the hydraulic pump P. FIG.

도 5에 도시된 바와 같이, 외부로 부터 공급되는 신호압에 의해 콘트롤밸브(a)가 도면상, 좌측방향으로 절환되는 경우, 유압펌프(P)로부터의 작동유는 콘트롤밸브(a)를 경유하여 더블 체크밸브(k)의 제2유로(s2)에 유입된다.As shown in FIG. 5, when the control valve a is switched to the left in the drawing due to the signal pressure supplied from the outside, the hydraulic oil from the hydraulic pump P passes through the control valve a. It flows into the 2nd flow path s2 of the double check valve k.

전술한 제2유로(s2)의 작동유가 수압부(n2)에 작용하여 플런저(h)를 도면상, 우측방향으로 절환시키고, 체크밸브(c)를 도면상, 좌측방향으로 가압하여 이의 체크기능을 해제시킨다(이때 제2탄성부재(e2)는 압축력을 받는다). 즉 체크밸브(k)의 제2유로(s2,s4)를 상호 연통시킨다.The hydraulic oil of the second flow path s2 described above acts on the hydraulic pressure unit n2 to switch the plunger h to the right in the drawing, and press the check valve c to the left in the drawing to check its function. Release (the second elastic member e2 receives a compressive force). That is, the second flow paths s2 and s4 of the check valve k communicate with each other.

이때, 플런저(h)의 절환으로 인해 체크밸브(b)를 도면상, 우측방향으로 가압하여 이의 체크기능을 해제시킨다(이때 제1탄성부재(e1)는 압축력을 받는다). 즉 체크밸브(k)의 제1유로(s1,s3)를 상호 연통시킨다.At this time, due to the switching of the plunger h, the check valve b is pushed in the right direction on the drawing to release its check function (the first elastic member e1 receives a compressive force at this time). That is, the first flow paths s1 and s3 of the check valve k communicate with each other.

이로 인해, 유압펌프(P)로부터의 작동유가 콘트롤밸브(a)와, 체크밸브(k)의 제2유로(s2,s4)을 차례로 통과하여 유압실린더(d)의 헤드측 챔버(d1)에 공급된다. 이때 유압실린더(d)의 로드측 챔버(d2)로 부터 배출되는 작동유는 체크기능이 해제된 체크밸브(b)와, 체크밸브(k)의 제1유로(s1,s3)와, 콘트롤밸브(a)를 차례로 통과하여 유압탱크로 귀환된다.Thus, the hydraulic oil from the hydraulic pump P passes through the control valve a and the second flow paths s2 and s4 of the check valve k in order to the head-side chamber d1 of the hydraulic cylinder d. Supplied. At this time, the hydraulic oil discharged from the rod-side chamber (d2) of the hydraulic cylinder (d) is the check valve (b) is the check function is released, the first flow path (s1, s3) of the check valve (k), the control valve ( Pass a) one by one and return to the hydraulic tank.

따라서, 유압실린더(d)는 유압펌프(P)로 부터 공급되는 작동유에 의해 신장구동된다.Therefore, the hydraulic cylinder d is extended and driven by the hydraulic oil supplied from the hydraulic pump P. FIG.

종래 기술의 더블 체크밸브를 갖는 건설장비에서는, 콘트롤밸브(a)가 중립상태를 유지하는 경우, 더블 체크밸브(k)에 내설된 체크밸브(b,c)의 체크기능에 의해 유압실린더(d)의 헤드측 챔버(d1)와 로드측 챔버(d2)를 연통시키지 못한다. 이로 인해 작업조건에 따라 도자 블레이드(f)에 플로팅 기능이 요구되는 경우에 플로팅 기능을 수행할 수 없는 문제점을 갖는다.In construction equipment having a double check valve of the prior art, when the control valve (a) maintains a neutral state, the hydraulic cylinder (d) by the check function of the check valve (b, c) built in the double check valve (k) ), The head side chamber d1 and the rod side chamber d2 cannot be communicated with each other. This causes a problem in that the floating function cannot be performed when the floating function is required for the ceramic blade f according to the working conditions.

본 발명의 일 실시예는, 더블 체크밸브가 구비된 유압실린더에 의해 구동되는 작업장치가 작업면을 평평하게 고르는 정지작업 등을 하게되는 경우 플로팅 기능을 수행하여 작업성을 향상시킬 수 있도록 한 플로팅 기능이 구비된 더블 체크밸브와 관련된다.One embodiment of the present invention, when the work device driven by the hydraulic cylinder provided with a double check valve is to stop the work to evenly flatten the working surface to perform a floating function to improve the workability It is associated with a double check valve equipped with a function.

본 발명의 일 실시예에 의한 플로팅 기능이 구비된 더블 체크밸브는, 유압펌프와,Double check valve with a floating function according to an embodiment of the present invention, the hydraulic pump,

유압펌프에 연결되고, 작업장치를 구동시키는 유압실린더와,A hydraulic cylinder connected to the hydraulic pump and driving the work device;

유압펌프와 유압실린더사이의 유로에 설치되고, 절환시 유압실린더의 기동, 정지 및 방향전환을 제어하는 콘트롤밸브와,A control valve installed in the flow path between the hydraulic pump and the hydraulic cylinder and controlling the start, stop and direction change of the hydraulic cylinder at the time of switching;

콘트롤밸브와 유압실린더사이의 유로를 개폐하도록 설치되고, 외부로부터의 신호압 공급시 서로 반대방향으로 절환되도록 분할형성되는 한쌍의 플런저와, 플런저의 절환에 의해 가압되어 체크기능이 각각 해제되는 한쌍의 체크밸브를 구비하는 더블 체크밸브를 포함하며,It is installed to open and close the flow path between the control valve and the hydraulic cylinder, a pair of plunger is formed to be switched in the opposite direction when supplying the signal pressure from the outside, and a pair of pressurized by the switching of the plunger to release the check function, respectively A double check valve having a check valve,

콘트롤밸브를 중립상태로 절환시키고 작업장치의 플로팅 기능모드를 선택하는 경우, 더블 체크밸브에 의해 유압실린더의 헤드측 챔버와 로드측 챔버를 상호 연통시킨다.When switching the control valve to the neutral state and selecting the floating function mode of the work equipment, the head side chamber and the rod side chamber of the hydraulic cylinder are mutually connected by the double check valve.

이때, 전술한 더블 체크밸브는,At this time, the double check valve described above,

콘트롤밸브와 유압실린더의 로드측 챔버를 상호 연통시키는 제1유로와, 콘트롤밸브와 유압실린더의 헤드측 챔버를 상호 연통시키는 제2유로가 형성되는 하우징과,A housing in which a first flow path for communicating the control valve and the rod side chamber of the hydraulic cylinder and a second flow path for communicating the control valve and the head side chamber of the hydraulic cylinder are formed;

플런저를 절환시키는 신호압력이 유입되는 신호압 통로와,A signal pressure passage through which a signal pressure for switching the plunger flows in;

제1유로를 개폐시키는 체크밸브를 가압하는 가압편과,A pressurizing piece for pressurizing a check valve for opening and closing the first flow path;

가압편을 탄성지지하여 체크밸브에 의해 제1유로를 차단하는 것을 초기상태 로 탄성바이어스하는 제1탄성부재와,A first elastic member elastically supporting the pressure piece and elastically biasing the first flow path to be blocked by the check valve in an initial state;

제2유로를 개폐시키는 체크밸브를 가압하는 가압편과,A pressurizing piece for pressurizing a check valve for opening and closing a second flow path;

가압편을 탄성지지하여 체크밸브에 의해 제2유로를 차단하는 것을 초기상태로 탄성바이어스하는 제2탄성부재를 포함한다.And a second elastic member elastically supporting the pressure piece to elastically bias the first flow path to block the second flow path by the check valve.

전술한 플런저를 절환시키는 신호압력으로서 유압펌프로 부터 신호압 통로에 공급되는 파일럿 신호압이 사용된다.As the signal pressure for switching the plunger described above, the pilot signal pressure supplied from the hydraulic pump to the signal pressure passage is used.

이하, 본 발명의 바람직한 실시예를 첨부된 도면을 참조하여 설명하되, 이는 본 발명이 속하는 기술 분야에서 통상의 지식을 가진 자가 발명을 용이하게 실시할 수 있을 정도로 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 with reference to the accompanying drawings, which are intended to describe in detail enough to enable those skilled in the art to easily practice the invention, and therefore It does not mean that the technical spirit and scope of the present invention is limited.

도 6 내지 도 9에 도시된 바와 같이, 본 발명의 일 실시예에 의한 플로팅 기능이 구비된 더블 체크밸브는, 유압펌프(P)와,6 to 9, the double check valve with a floating function according to an embodiment of the present invention, the hydraulic pump (P),

유압펌프(P)에 연결되고, 작업장치를 구동시키는 유압실린더(d)와,A hydraulic cylinder (d) connected to the hydraulic pump (P) and driving the work device;

유압펌프(P)와 유압실린더(d)사이의 유로에 설치되고, 절환시 유압실린더(d)의 기동, 정지 및 방향전환을 제어하는 콘트롤밸브(a)와,A control valve (a) installed in the flow path between the hydraulic pump (P) and the hydraulic cylinder (d), for controlling the start, stop, and direction change of the hydraulic cylinder (d) during switching;

콘트롤밸브(a)와 유압실린더(d)사이의 제1유로(s1,s3)와 제2유로(s2,s4)를 개폐하도록 설치되고, 외부로부터의 신호압이 수압부(n3,n4)에 작용시 서로 반대방향으로 절환되도록 분할형성되는 한쌍의 플런저(h1,h2)와, 플런저(h1,h2)의 절환에 의해 가압되어 체크기능이 각각 해제되는 한쌍의 체크밸브(b,c)(일예로서, 볼(ball)타입 또는 포펫(poppet)이 사용될 수 있음)를 구비하는 더블 체크밸브(k)를 포함하며,It is provided to open and close the first flow path (s1, s3) and the second flow path (s2, s4) between the control valve (a) and the hydraulic cylinder (d), the signal pressure from the outside to the hydraulic pressure section (n3, n4) A pair of plungers (h1, h2) which are dividedly formed so as to be switched in opposite directions when acting, and a pair of check valves (b, c), each of which is pressurized by switching of the plungers (h1, h2) to release the check function (example) As a double check valve (k) having a ball type or poppet),

전술한 콘트롤밸브(a)를 중립상태로 절환시키고 작업장치(일예로서, 도자 블레이드(f)를 말함)의 플로팅(floating) 기능모드를 선택하는 경우, 더블 체크밸브(k)에 의해 유압실린더(d)의 헤드측 챔버(d1)와 로드측 챔버(d2)를 상호 연통시킨다.When switching the above-described control valve a to a neutral state and selecting the floating function mode of the work device (for example, the ceramic blade f), the hydraulic cylinder (by the double check valve k) The head side chamber d1 and the rod side chamber d2 of d) are communicated with each other.

이때, 전술한 더블 체크밸브(k)는,At this time, the above-mentioned double check valve k,

콘트롤밸브(a)와 유압실린더(d)의 로드측 챔버(d2)를 상호 연통시키는 제1유로(s1,s3)와, 콘트롤밸브(a)와 유압실린더(d)의 헤드측 챔버(d1)를 상호 연통시키는 제2유로(s2,s4)가 형성되는 하우징(m)과,First flow paths s1 and s3, which communicate the control valve a and the rod side chamber d2 of the hydraulic cylinder d, and the head side chamber d1 of the control valve a and the hydraulic cylinder d. A housing m in which second flow paths s2 and s4 communicating with each other are formed;

플런저(h1,h2)를 절환시키는 신호압력이 파일럿 펌프(Pp)로 부터 유입되는 신호압 통로(j)와,A signal pressure passage j through which the signal pressure for switching the plungers h1 and h2 flows in from the pilot pump Pp,

제1유로(s1,s3)를 개폐시키는 체크밸브(b)를 가압하는 가압편(f1)과,A pressing piece f1 for pressing the check valve b for opening and closing the first flow paths s1 and s3;

가압편(f1)을 탄성지지하여 체크밸브(b)에 의해 제1유로(s1,s3)를 차단하는 것을 초기상태로 탄성바이어스하는 제1탄성부재(e1)와,A first elastic member e1 elastically supporting the pressing piece f1 to elastically bias the first flow paths s1 and s3 by the check valve b to be in an initial state;

제2유로(s2,s4)를 개폐시키는 체크밸브(c)를 가압하는 가압편(f2)과,A pressing piece f2 for pressing the check valve c for opening and closing the second flow paths s2 and s4,

가압편(f2)을 탄성지지하여 체크밸브(c)에 의해 제2유로(s2,s4)를 차단하는 것을 초기상태로 탄성바이어스하는 제2탄성부재(e2)를 포함한다.And a second elastic member e2 elastically supporting the pressing piece f2 and elastically biasing the second flow paths s2 and s4 by the check valve c in an initial state.

전술한 플런저(h1,h2)를 절환시키는 신호압력으로서 유압펌프(Pp)로 부터 신호압 통로(j)에 공급되는 파일럿 신호압이 사용된다.As the signal pressure for switching the plungers h1 and h2 described above, the pilot signal pressure supplied from the hydraulic pump Pp to the signal pressure passage j is used.

전술한 더블 체크밸브(k)는 유압펌프(P)로부터의 작동유에 의해 구동되거나, 또는 압축공기공급원(미도시됨)으로 부터 공급되는 공기압에 의해 구동될 수 있다.The above-described double check valve k may be driven by hydraulic oil from the hydraulic pump P, or may be driven by air pressure supplied from a compressed air supply source (not shown).

이하에서, 본 발명의 일 실시예에 의한 플로팅 기능이 구비된 더블 체크밸브의 사용예를 첨부된 도면을 참조하여 설명한다.Hereinafter, a use example of a double check valve with a floating function according to an embodiment of the present invention will be described with reference to the accompanying drawings.

도 6에 도시된 바와 같이, 전술한 콘트롤밸브(a)가 중립상태를 유지하는 경우, 제1,2탄성부재(e1,e2) 및 가압편(f1,f2)에 의해 각각 탄성지지된 체크밸브(b,c)에 의해 더블 체크밸브(k)가 체크밸브의 기능을 수행한다. 이때 분할형성된 한쌍의 플런저(h1,h2)는 밀착된 상태를 유지한다.As shown in FIG. 6, when the above-described control valve a maintains a neutral state, the check valve elastically supported by the first and second elastic members e1 and e2 and the pressing pieces f1 and f2, respectively. The double check valve k performs the function of the check valve by (b, c). At this time, the pair of divided plungers (h1, h2) is maintained in close contact.

즉, 체크밸브(b)에 의해 콘트롤밸브(a)와 유압실린더(d)의 로드측 챔버(d2)를 상호 연통시키는 제1유로(s1,s3)를 차단하고, 체크밸브(c)에 의해 콘트롤밸브(a)와 유압실린더(d)의 헤드측 챔버(d1)를 상호 연통시키는 제2유로(s2,s4)를 차단한다.That is, the first flow paths s1 and s3, which communicate the control valve a and the rod side chamber d2 of the hydraulic cylinder d, are blocked by the check valve b, and the check valve c The second flow paths s2 and s4, which communicate with the control valve a and the head side chamber d1 of the hydraulic cylinder d, are blocked.

이로 인해, 유압펌프(P)로부터의 작동유가 유압실린더(d)에 공급되지않는다. 또한 유압실린더(d)로부터의 작동유가 유압탱크로 귀환되지않는다.For this reason, the hydraulic oil from the hydraulic pump P is not supplied to the hydraulic cylinder d. Also, the hydraulic oil from the hydraulic cylinder d does not return to the hydraulic tank.

따라서, 장비의 도자 블레이드(f)의 침하되는 것을 방지할 수 있다.Therefore, the settlement of the ceramic blade f of the equipment can be prevented.

도 7에 도시된 바와 같이, 외부로 부터 공급되는 신호압에 의해 콘트롤밸브(a)가 도면상, 우측방향으로 절환되는 경우, 유압펌프(P)로부터의 작동유는 콘트롤밸브(a)를 경유하여 더블 체크밸브(k)의 제1유로(s1)에 유입된다. 이때 분할형성 된 한쌍의 플런저(h1,h2)는 밀착된 상태로 좌측방향으로 슬라이딩이동되어 절환된다.As shown in FIG. 7, when the control valve a is switched to the right direction in the drawing by the signal pressure supplied from the outside, the hydraulic oil from the hydraulic pump P passes through the control valve a. It flows into the 1st flow path s1 of the double check valve k. At this time, the pair of divided plungers (h1, h2) is switched by sliding the left direction in close contact.

전술한 제1유로(s1)의 작동유가 수압부(n1)에 작용하여 플런저(h1,h2)를 도면상, 좌측방향으로 절환시킴에 따라, 체크밸브(b)를 가압하여 이의 체크기능을 해제시켜 제1유로(s1,s3)를 상호 연통시킨다. 이로 인해 유압펌프(P)로부터의 작동유가 콘트롤밸브(a)와, 제1유로(s1,s3)를 차례로 통과하여 유압실린더(d)의 로드측 챔버(d2)에 공급된다.As the hydraulic oil of the first flow path s1 described above acts on the hydraulic pressure portion n1 and switches the plungers h1 and h2 to the left in the drawing, the check valve b is pressed to release its check function. First passages s1 and s3 are communicated with each other. Thus, the hydraulic oil from the hydraulic pump P passes through the control valve a and the first flow paths s1 and s3 in order and is supplied to the rod side chamber d2 of the hydraulic cylinder d.

동시에, 밀착된 플런저(h1,h2)의 절환으로 인해 체크밸브(c)를 가압하여 이의 체크기능을 해제시켜 제2유로(s2,s4)를 상호 연통시킨다. 이로 인해 유압실린더(d)의 헤드측 챔버(d1)로부터의 작동유는 제2유로(s2,s4)와, 콘트롤밸브(a)를 차례로 통과하여 유압탱크로 귀환된다.At the same time, due to the switching of the plungers h1 and h2 in close contact, the check valve c is pressed to release its check function so that the second flow paths s2 and s4 communicate with each other. Thus, the hydraulic oil from the head side chamber d1 of the hydraulic cylinder d passes through the second flow paths s2 and s4 and the control valve a in order to be returned to the hydraulic tank.

도 8에 도시된 바와 같이, 외부로 부터 공급되는 신호압에 의해 콘트롤밸브(a)가 도면상, 좌측방향으로 절환되는 경우, 유압펌프(P)로부터의 작동유는 콘트롤밸브(a)를 경유하여 더블 체크밸브(k)의 제2유로(s2)에 유입된다. 이때 분할형성된 한쌍의 플런저(h1,h2)는 밀착된 상태로 우측방향으로 슬라이딩이동되어 절환된다.As shown in FIG. 8, when the control valve a is switched to the left in the drawing by the signal pressure supplied from the outside, the hydraulic oil from the hydraulic pump P passes through the control valve a. It flows into the 2nd flow path s2 of the double check valve k. At this time, the pair of divided plungers (h1, h2) is switched by sliding in the right direction in close contact.

전술한 제2유로(s2)의 작동유가 수압부(n2)에 작용하여 플런저(h1,h2)를 도면상, 우측방향으로 절환시킴에 따라, 체크밸브(c)를 가압하여 이의 체크기능을 해제시켜 제2유로(s2,s4)를 상호 연통시킨다. 이로 인해 유압펌프(P)로부터의 작동유가 콘트롤밸브(a)와, 제2유로(s2,s4)를 차례로 통과하여 유압실린더(d)의 헤드측 챔버(d1)에 공급된다.As the hydraulic oil of the second flow path s2 described above acts on the hydraulic pressure unit n2 and switches the plungers h1 and h2 to the right in the drawing, the check valve c is pressed to release its check function. The second flow paths s2 and s4 are communicated with each other. As a result, the hydraulic oil from the hydraulic pump P passes through the control valve a and the second flow paths s2 and s4 in order and is supplied to the head side chamber d1 of the hydraulic cylinder d.

동시에, 플런저(h1,h2)의 절환으로 인해 체크밸브(b)를 가압하여 이의 체크기능을 해제시켜 제2유로(s2,s4)를 상호 연통시킨다. 이로 인해 유압실린더(d)의 로드측 챔버(d2)로부터의 작동유는 제1유로(s1,s3)와, 콘트롤밸브(a)를 차례로 통과하여 유압탱크로 귀환된다.At the same time, due to the switching of the plungers h1 and h2, the check valve b is pressed to release its check function so that the second flow paths s2 and s4 communicate with each other. Thus, the hydraulic oil from the rod side chamber d2 of the hydraulic cylinder d passes through the first flow passages s1 and s3 and the control valve a in turn and returns to the hydraulic tank.

도 9는 콘트롤밸브(a)를 중립상태로 절환시키고, 도자 블레이드(f)의 플로팅 기능을 선택하는 경우이다.9 shows a case where the control valve a is switched to a neutral state and the floating function of the ceramic blade f is selected.

전술한 체크밸브(k)에 형성된 신호압 통로(j)에 유압펌프(Pp)로부터의 파일럿 신호압이 공급되는 경우, 분할형성된 한쌍의 플런저(h1,h2)를 서로 반대방향으로 동시에 절환시킨다.When the pilot signal pressure from the hydraulic pump Pp is supplied to the signal pressure passage j formed in the aforementioned check valve k, the pair of split plungers h1 and h2 are simultaneously switched in opposite directions.

즉, 플런저(h1)의 수압부(n3)에 작용하는 파일럿 신호압에 의해 플런저(h1)를 도면상, 우측방향으로 절환시킴에 따라 체크밸브(b)를 우측방향으로 가압하여 이의 체크기능을 해제시킨다(이때 제1탄성부재(e1)는 압축력을 받는다). 즉 체크밸브(k)의 제1유로(s1,s3)를 서로 연통시킨다.That is, as the plunger h1 is switched to the right side in the drawing by the pilot signal pressure acting on the pressure receiving portion n3 of the plunger h1, the check valve b is pushed to the right to check its function. Release (the first elastic member e1 receives a compressive force). That is, the first flow paths s1 and s3 of the check valve k communicate with each other.

동시에, 플런저(h2)의 수압부(n4)에 작용하는 파일럿 신호압에 의해 플런저(h2)를 도면상, 좌측방향으로 절환시킴에 따라 체크밸브(c)를 좌측방향으로 가압하여 이의 체크기능을 해제시킨다(이때 제2탄성부재(e2)는 압축력을 받는다). 즉 체크밸브(k)의 제2유로(s2,s4)를 서로 연통시킨다.At the same time, as the plunger h2 is switched to the left in the drawing by the pilot signal pressure acting on the pressure receiving portion n4 of the plunger h2, the check valve c is pushed to the left to check its function. Release (the second elastic member e2 receives a compressive force). That is, the second flow paths s2 and s4 of the check valve k communicate with each other.

이로 인해, 전술한 제1유로(s1,s3)에 의해 콘트롤밸브(a)와 유압실린더(d)의 로드측 챔버(d2)가 서로 연통되고, 제2유로(s2,s4)에 의해 콘트롤밸브(a)와 유압실린더(d)의 헤드측 챔버(d1)가 서로 연통된다.For this reason, the control valve a and the rod side chamber d2 of the hydraulic cylinder d communicate with each other by the first passages s1 and s3 described above, and the control valves by the second passages s2 and s4. (a) and the head side chamber d1 of the hydraulic cylinder d communicate with each other.

따라서, 유압실린더(d)의 로드측 챔버(d2)와 헤드측 챔버(d1)는 서로 연통된다. 즉 무부하 상태의 유압실린더(d)의 헤드측 챔버(d1)로부터의 작동유가 제2유로(s4,s2), 콘트롤밸브(a), 제1유로(s1,s3)를 차례로 통과하여 유압실린더(d)의 로드측 챔버(d2)에 전달되는 경우(화살표로 표기됨), 유압실린더(d)는 수축구동된다.Therefore, the rod side chamber d2 and the head side chamber d1 of the hydraulic cylinder d communicate with each other. That is, the hydraulic oil from the head side chamber d1 of the hydraulic cylinder d in the no-load state passes through the second flow paths s4 and s2, the control valve a, and the first flow paths s1 and s3 in order. When delivered to the rod side chamber d2 of d) (denoted by an arrow), the hydraulic cylinder d is contracted and driven.

반대로, 무부하 상태의 유압실린더(d)의 로드측 챔버(d2)로부터의 작동유가 제1유로(s3,s1), 콘트롤밸브(a), 제2유로(s2,s4)를 차례로 통과하여 유압실린더(d)의 헤드측 챔버(d1)에 전달되는 경우(화살표로 표기됨), 유압실린더(d)는 신축구동된다.On the contrary, the hydraulic oil from the rod side chamber d2 of the hydraulic cylinder d in the no-load state passes through the first flow path s3 and s1, the control valve a, and the second flow path s2 and s4 in order. When delivered to the head side chamber d1 of (d) (marked with an arrow), the hydraulic cylinder d is telescopically driven.

이로 인해, 도자 블레이드(f)를 장착한 장비가 굴곡이 있는 지면(g)을 따라 주행하는 경우, 무부하 상태의 유압실린더(d)는 지면(g)의 형상에 따라 변위가 자동으로 조절되므로 플로팅 기능을 수행할 수 있다.For this reason, when the equipment equipped with the ceramic blade f travels along the curved ground g, the hydraulic cylinder d in the no-load state floats because the displacement is automatically adjusted according to the shape of the ground g. Function can be performed.

전술한 바와 같이, 본 발명의 일 실시예에 의한 플로팅 기능이 구비된 더블 체크밸브는 아래와 같은 이점을 갖는다.As described above, the double check valve with a floating function according to an embodiment of the present invention has the following advantages.

더블 체크밸브가 구비된 유압실린더에 의해 구동되는 작업장치가 작업면을 평평하게 고르는 정지작업 등을 하게되는 경우 플로팅 기능을 수행하여 작업성 및 장비의 신뢰성을 향상시킬 수 있다.When a work device driven by a hydraulic cylinder equipped with a double check valve is used to stop the work surface evenly, it is possible to perform a floating function to improve workability and equipment reliability.

Claims (4)

유압펌프;Hydraulic pump; 상기 유압펌프에 연결되고, 작업장치를 구동시키는 유압실린더;A hydraulic cylinder connected to the hydraulic pump and driving a work device; 상기 유압펌프와 유압실린더사이의 유로에 설치되고, 절환시 유압실린더의 기동, 정지 및 방향전환을 제어하는 콘트롤밸브; 및A control valve installed in a flow path between the hydraulic pump and the hydraulic cylinder and controlling the start, stop and direction change of the hydraulic cylinder at the time of switching; And 상기 콘트롤밸브와 유압실린더사이의 유로에 설치되고, 외부로부터의 신호압 공급시 서로 반대방향으로 절환되도록 분할형성되는 한쌍의 플런저와, 상기 플런저의 절환에 의해 가압되어 체크기능이 각각 해제되는 한쌍의 체크밸브를 구비하는 더블 체크밸브를 포함하며,A pair of plungers installed in the flow path between the control valve and the hydraulic cylinder and separately divided so as to be switched in opposite directions when a signal pressure is supplied from the outside, and a pair of pressurized portions which are pressurized by the switching of the plungers, respectively, to release the check function; A double check valve having a check valve, 상기 콘트롤밸브를 중립상태로 절환시키고 상기 작업장치의 플로팅 기능모드를 선택하는 경우, 상기 더블 체크밸브에 의해 유압실린더의 헤드측 챔버와 로드측 챔버를 상호 연통시키는 것을 특징으로 하는 플로팅 기능이 구비된 더블 체크밸브.When the control valve is switched to the neutral state and the floating function mode of the work device is selected, the floating function is characterized in that the double check valve communicates with the head side chamber and the rod side chamber of the hydraulic cylinder. Double check valve. 청구항 1에 있어서, 상기 더블 체크밸브는,The method of claim 1, wherein the double check valve, 상기 콘트롤밸브와 유압실린더의 로드측 챔버를 상호 연통시키는 제1유로와, 상기 콘트롤밸브와 유압실린더의 헤드측 챔버를 상호 연통시키는 제2유로가 형성되는 하우징;A housing having a first flow passage communicating the control valve and the rod side chamber of the hydraulic cylinder and a second flow passage communicating the control valve and the head side chamber of the hydraulic cylinder; 상기 플런저를 절환시키는 신호압력이 유입되는 신호압 통로;A signal pressure passage through which a signal pressure for switching the plunger is introduced; 상기 제1유로를 개폐시키는 체크밸브를 가압하는 가압편;A pressurizing piece for pressurizing a check valve for opening and closing the first flow path; 상기 가압편을 탄성지지하여 상기 체크밸브에 의해 제1유로를 차단하는 것을 초기상태로 탄성바이어스하는 제1탄성부재;A first elastic member elastically supporting the pressure piece to elastically bias the first flow path to block the first flow path by the check valve; 상기 제2유로를 개폐시키는 체크밸브를 가압하는 가압편; 및A pressurizing piece for pressurizing a check valve for opening and closing the second flow path; And 상기 가압편을 탄성지지하여 상기 체크밸브에 의해 제2유로를 차단하는 것을 초기상태로 탄성바이어스하는 제2탄성부재를 포함하는 것을 특징으로 하는 플로팅 기능이 구비된 더블 체크밸브.And a second elastic member elastically supporting the pressure piece so as to elastically bias an initial state of blocking the second flow path by the check valve. 청구항 2에 있어서, 상기 플런저를 절환시키는 신호압력으로서 유압펌프로 부터 상기 신호압 통로에 공급되는 파일럿 신호압이 사용되는 것을 특징으로 하는 플로팅 기능이 구비된 더블 체크밸브.The double check valve with a floating function according to claim 2, wherein the pilot signal pressure supplied from the hydraulic pump to the signal pressure passage is used as the signal pressure for switching the plunger. 청구항 1 또는 청구항 2에 있어서, 상기 체크밸브로서 볼타입 또는 포펫이 사용되는 것을 특징으로 하는 플로팅 기능이 구비된 더블 체크밸브.The double check valve with a floating function according to claim 1 or 2, wherein a ball type or a poppet is used as the check valve.
KR1020060119035A 2006-11-29 2006-11-29 double check valve with floating function KR100849500B1 (en)

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KR1020060119035A KR100849500B1 (en) 2006-11-29 2006-11-29 double check valve with floating function
US11/825,637 US20080121101A1 (en) 2006-11-29 2007-07-06 Double check valve having floating function
EP07014738A EP1927759A1 (en) 2006-11-29 2007-07-27 Double check valve having floating function
CNA2007101371672A CN101191506A (en) 2006-11-29 2007-07-30 Double check valve having floating function
JP2007284674A JP2008138870A (en) 2006-11-29 2007-11-01 Double check valve with floating function

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WO2011145759A1 (en) * 2010-05-18 2011-11-24 볼보 컨스트럭션 이큅먼트 에이비 Double check valve for construction equipment
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US20080121101A1 (en) 2008-05-29

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