[go: up one dir, main page]

WO2016208780A1 - Hydraulic circuit for construction equipment - Google Patents

Hydraulic circuit for construction equipment Download PDF

Info

Publication number
WO2016208780A1
WO2016208780A1 PCT/KR2015/006319 KR2015006319W WO2016208780A1 WO 2016208780 A1 WO2016208780 A1 WO 2016208780A1 KR 2015006319 W KR2015006319 W KR 2015006319W WO 2016208780 A1 WO2016208780 A1 WO 2016208780A1
Authority
WO
WIPO (PCT)
Prior art keywords
boom
hydraulic pump
bucket
cylinder
control 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.)
Ceased
Application number
PCT/KR2015/006319
Other languages
French (fr)
Korean (ko)
Inventor
강민혁
김진욱
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Volvo Construction Equipment AB
Original Assignee
Volvo Construction Equipment AB
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 Volvo Construction Equipment AB filed Critical Volvo Construction Equipment AB
Priority to PCT/KR2015/006319 priority Critical patent/WO2016208780A1/en
Publication of WO2016208780A1 publication Critical patent/WO2016208780A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors

Definitions

  • the present invention relates to a hydraulic circuit, and more specifically, to a hydraulic circuit for construction machinery for controlling the combined flow rate supplied from the hydraulic pump to the working device when a plurality of working devices are operated simultaneously and combined work.
  • FIG. 1 is a hydraulic circuit diagram for a construction machine in a boom up and bucket in state according to the prior art.
  • a variable displacement first hydraulic pump 1 (hereinafter referred to as a first hydraulic pump) and a variable displacement second hydraulic pump 2 (hereinafter referred to as a second hydraulic pump) include an engine ( Not shown).
  • An arm cylinder 3 driven by the hydraulic oil of the first hydraulic pump 1 is connected to the first hydraulic pump 1 through the supply passage 4.
  • An arm control valve 5 for controlling the hydraulic oil flow direction supplied to the arm cylinder 3 at the time of switching by the application of a pilot pressure is provided on the downstream side of the supply passage 4 of the first hydraulic pump 1. Is installed.
  • the arm control valve (CBP) of the supply flow path 4 of the first hydraulic pump 1 has a CBP (center by pass) valve 6 which forms a pressure in the supply flow path 4 at the time of switching by application of a pilot pressure. 5) is installed on the downstream side.
  • CBP center by pass valve
  • the boom cylinder 7 and the bucket cylinder 8 driven by the working oil of the second hydraulic pump 2 are connected to the second hydraulic pump 2 through the supply passages 9 and 9a.
  • a bucket control valve 10 for controlling the hydraulic oil flow direction supplied to the bucket cylinder 8 at the time of switching by the application of pilot pressure is provided on the downstream side of the supply passage 9 of the second hydraulic pump 2. Is installed.
  • a boom first control valve 11 for controlling the flow direction of the hydraulic oil supplied to the boom cylinder 7 at the time of switching by the application of a pilot pressure is upstream of the supply flow path 9 of the second hydraulic pump 2. Is installed on the side.
  • Boom second control valve 13 for supplying the hydraulic oil of the first hydraulic pump 1 to the bucket cylinder 8 or the boom cylinder 7 through the confluence passage 12 at the time of switching by application of pilot pressure. MCV) is provided upstream of the supply passage 4 of the first hydraulic pump 1.
  • a part of the hydraulic oil of the second hydraulic pump 2 is supplied to the large chamber of the boom cylinder 7 through the supply passage 9 and the boom first control valve 11 and at the same time, the second hydraulic pump.
  • a part of the working oil of (2) passes through the flow path 9a and the bucket control valve 10 and is supplied to the large chamber of the bucket cylinder 8, respectively.
  • the pilot pressure by the operation of the operation lever is simultaneously applied to the boom second control valve 13 and the CBP valve 6 to switch the spool. Accordingly, a part of the hydraulic oil of the first hydraulic pump 1 passes through the second boom control valve 13, the arm control valve 5, the confluence flow passage 12, and the bucket control valve 10 to pass through the bucket cylinder 8. Is supplied to the large chamber. At the same time, a part of the hydraulic oil of the first hydraulic pump 1 passes through the boom second control valve 13, the arm control valve 5, the joining flow passage 12, the flow path 9a and the boom first control valve 11. It is supplied to the large chamber of the boom cylinder 7 so that it is joined with the hydraulic oil supplied from the second hydraulic pump (2).
  • the load generated in the boom cylinder 7 is greater than the load generated in the bucket cylinder 8 when performing a complex operation by boom up and bucket in operation.
  • the hydraulic fluid supplied to join the boom cylinder 7 and the bucket cylinder 8 from the first hydraulic pump 1 in the combined operation is preferentially supplied to the bucket cylinder 8 rather than the boom cylinder 7. And join.
  • the bucket in is unbalanced due to the difference in flow rate supplied from the first hydraulic pump 1 to the boom cylinder 7 and the bucket cylinder 8 and joined. And an imbalance between the boom up operation.
  • the present invention is to solve the above-mentioned problems, the construction to control the combined flow rate supplied from the hydraulic pump to the working device when operating a plurality of working devices at the same time to balance the operation between the working devices It is an object to provide a hydraulic circuit for a machine.
  • the first hydraulic pump and the second hydraulic pump are configured to achieve the above and other objects of the present invention.
  • a CBP valve installed at a downstream side of a supply flow path of the first hydraulic pump
  • a bucket control valve installed downstream of the supply flow path of the second hydraulic pump and controlling a flow direction of the hydraulic oil supplied to the bucket cylinder during switching;
  • a boom first control valve installed at an upstream side of a supply flow path of the second hydraulic pump and configured to control a flow direction of the hydraulic oil supplied to the boom cylinder during switching;
  • a second boom control valve installed at an upstream side of a supply flow path of the first hydraulic pump and configured to supply hydraulic oil of the first hydraulic pump to the bucket cylinder or the boom cylinder through a confluence flow path at the time of switching;
  • the bucket joining shutoff valve installed in the joining flow path and the bucket joining shutoff valve are switched by a pilot pressure applied during a complex operation by driving the boom cylinder and the bucket cylinder, and the switching is performed by closing the joining flow path. It provides a hydraulic circuit for a construction machine, characterized in that for blocking the flow rate of the confluence supplied to the bucket cylinder from the hydraulic pump and supplying the flow rate of confluence to the boom cylinder through the second boom control valve.
  • FIG. 1 is a hydraulic circuit diagram for a construction machine in a boom up and bucket in state according to the prior art
  • FIG. 2 is a hydraulic circuit diagram for a construction machine in a boom up and bucket in state according to an embodiment of the present invention
  • FIG. 3 is a view for explaining a boom up alone driving state in the hydraulic circuit for construction machinery according to an embodiment of the present invention
  • FIG. 4 is a view for explaining the bucket-in alone driving state in the hydraulic circuit for construction machinery according to an embodiment of the present invention.
  • FIG. 2 is a hydraulic circuit diagram for a construction machine in a boom up and a bucket-in state according to an embodiment of the present invention
  • Figure 3 is a circuit for driving the boom up alone in the hydraulic circuit for construction machinery according to an embodiment of the present invention
  • 4 is a circuit for driving a bucket alone in a hydraulic circuit for a construction machine according to an embodiment of the present invention.
  • the hydraulic circuit for a construction machine according to an embodiment of the present invention, the variable displacement first hydraulic pump (hereinafter referred to as the first hydraulic pump) (1) and the variable displacement second hydraulic pressure A pump (hereinafter referred to as a second hydraulic pump) 2 is connected to the engine (not shown) or the like.
  • the first hydraulic pump the variable displacement first hydraulic pump
  • the variable displacement second hydraulic pressure A pump hereinafter referred to as a second hydraulic pump
  • An arm cylinder 3 driven by the hydraulic oil of the first hydraulic pump 1 is connected to the first hydraulic pump 1 through a supply passage 4.
  • An arm control valve 5 for controlling the hydraulic oil flow direction supplied to the arm cylinder 3 at the time of switching by the application of a pilot pressure is provided on the downstream side of the supply passage 4 of the first hydraulic pump 1. Is installed.
  • a CBP valve for forming a pressure in the supply passage 4 at the time of switching by the application of a pilot pressure is installed downstream of the arm control valve 5 in the supply passage 4 of the first hydraulic pump 1. .
  • the boom cylinder 7 and the bucket cylinder 8 driven by the working oil of the second hydraulic pump 2 are connected to the second hydraulic pump 2 through the supply passages 9 and 9a.
  • a bucket control valve 10 for controlling the hydraulic oil flow direction supplied to the bucket cylinder 8 at the time of switching by the application of pilot pressure is provided on the downstream side of the supply passage 9 of the second hydraulic pump 2. Is installed.
  • a boom first control valve 11 for controlling the flow direction of the hydraulic oil supplied to the boom cylinder 7 at the time of switching by the application of a pilot pressure is upstream of the supply flow path 9 of the second hydraulic pump 2. Is installed on the side.
  • Boom second control valve 13 for supplying the hydraulic oil of the first hydraulic pump 1 to the bucket cylinder 8 or the boom cylinder 7 through the confluence passage 12 at the time of switching by application of pilot pressure. MCV) is provided upstream of the supply passage 4 of the first hydraulic pump 1.
  • the boom cylinder 7 and the bucket cylinder 8 is switched by the pilot pressure applied during the compounding operation, and the switching from the first hydraulic pump 1 due to the closing of the confluence passage 12
  • the bucket flow rate blocking valve 14 is connected to the flow path. It is installed at (12).
  • the bucket confluence shutoff valve 14 and the CBP valve 6 are switched by simultaneously applying the pilot pressure applied to the second boom control valve 13 to drive the boom up during the combined operation.
  • Orifice 16 provided in parallel passage 15 branched to supply passage 4 of first hydraulic pump 1 at the inlet side of arm control valve 5 and boom second control valve 13. It may be provided.
  • the spool of the boom first control valve 11 is switched by the pilot pressure applied by the operation of the operation lever (not shown). Therefore, the hydraulic oil of the second hydraulic pump 2 passes through the supply passage 9 and the boom first control valve 11 and is supplied to the large chamber of the boom cylinder 7.
  • pilot pressure by the operation of the operation lever is applied to the boom second control valve 13 to switch the spool. Since the pilot pressure applied to the second boom control valve 13 is simultaneously applied to the CBP valve 6 to switch the spool to close the opening, pressure is formed in the supply passage 4.
  • the hydraulic oil of the first hydraulic pump 1 is connected to the boom second control valve 13, the arm control valve 5, the bucket joining shutoff valve 14, the joining flow passage 12, the flow path 9a and the boom. Since it is supplied to the large chamber of the boom cylinder 7 through the 1st control valve 11, it joins with the hydraulic oil supplied from the said 2nd hydraulic pump 2. As shown in FIG. At this time, the hydraulic oil discharged from the small chamber of the boom cylinder 7 which is extended and driven passes through the boom first control valve 11 and is returned to the hydraulic oil tank.
  • the boom cylinder 7 may be driven by the hydraulic oil supplied from the first and second hydraulic pumps 1 and 2, thereby driving the boom up.
  • the spool of the bucket control valve 10 is switched by the pilot pressure applied by the operation of the operation lever (not shown).
  • the hydraulic oil of the second hydraulic pump 2 passes through the flow path 9a and the bucket control valve 10 and is supplied to the large chamber of the bucket cylinder 8.
  • the hydraulic oil of the first hydraulic pump 1 passes through the second boom control valve 13, the arm control valve 5, and the bucket joining shutoff valve 14 to be supplied to the joining flow path 12.
  • the hydraulic oil supplied from the second hydraulic pump (2) through the flow path (9a) through the bucket control valve 10 is supplied to the large chamber of the bucket cylinder (8).
  • the bucket cylinder 8 may be driven by the hydraulic oil supplied from the first and second hydraulic pumps 1 and 2 to drive the bucket in.
  • the spool of the boom first control valve 11 and the bucket control valve 10 is switched by the pilot pressure applied by the operation of the operation lever. Therefore, a part of the hydraulic oil of the second hydraulic pump 2 passes through the supply passage 9 and the boom first control valve 11 and is supplied to the large chamber of the boom cylinder 7, and at the same time the second hydraulic pump ( A part of the hydraulic oil of 2) passes through the flow path 9a and the bucket control valve 10 and is supplied to the large chamber of the bucket cylinder 8.
  • the pilot pressure by the operation of the operation lever is applied to the boom second control valve 13 to switch the spool.
  • the supply passage 4 of the first hydraulic pump 1 passing through the boom second control valve 13 is always open. Therefore, the hydraulic oil of the first hydraulic pump 1 is supplied to the arm control valve 5 through the supply passage 4 rather than being supplied to the arm control valve 5 through the parallel passage 15 provided with the orifice 16.
  • a pilot pressure applied to switch the boom second control valve 13 is simultaneously applied to the CBP valve 6 and the bucket confluence shutoff valve 14 to switch the spool (shown in FIG. 2).

Landscapes

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

Abstract

Disclosed is a hydraulic circuit for construction equipment, the hydraulic circuit controlling a confluence flow rate supplied from a hydraulic pump to a plurality of working apparatuses when a composite work is carried out by simultaneously operating the working apparatuses. The hydraulic circuit, according to the present invention, comprises: a CBP valve provided at the furthest downstream side of a supply flow path for a first hydraulic pump; a boom cylinder and a bucket cylinder that are driven by a hydraulic oil of a second hydraulic pump; a bucket control valve that controls the flow direction of the hydraulic oil supplied from the second hydraulic pump to the bucket cylinder when being switched; a first boom control valve that controls the flow direction of the hydraulic oil supplied from the second hydraulic pump to the boom cylinder when being switched; a second boom control valve that supplies hydraulic oil of the first hydraulic pump to the bucket cylinder or the boom cylinder through a joint flow path when being switched; and a bucket joint shut-off valve provided on the joint flow path, wherein the bucket joint shut-off valve is switched by driving the boom cylinder or the bucket cylinder when a composite work is carried out, and shuts off the confluence flow rate supplied from the first hydraulic pump to the bucket cylinder due to the closure of the joint flow path when being switched and supplies the confluence flow rate to the boom cylinder through the second boom control valve.

Description

건설기계용 유압회로Hydraulic Circuit for Construction Machinery

본 발명은 유압회로에 관한 것으로, 보다 구체적으로 설명하면, 복수의 작업장치를 동시에 조작하여 복합작업할 경우 유압펌프로부터 작업장치에 공급되는 합류 유량을 제어하기 위한 건설기계용 유압회로에 관한 것이다.The present invention relates to a hydraulic circuit, and more specifically, to a hydraulic circuit for construction machinery for controlling the combined flow rate supplied from the hydraulic pump to the working device when a plurality of working devices are operated simultaneously and combined work.

도 1은 종래 기술에 의한 붐 업 및 버킷 인 상태의 건설기계용 유압회로도이다.1 is a hydraulic circuit diagram for a construction machine in a boom up and bucket in state according to the prior art.

도 1에 도시한 바와 같이, 가변용량형 제1유압펌프(1)(이하 제1유압펌프 라고 함) 및 가변용량형 제2유압펌프(2)(이하 제2유압펌프 라고 함)가 엔진(미도시됨) 등에 연결된다.As shown in FIG. 1, a variable displacement first hydraulic pump 1 (hereinafter referred to as a first hydraulic pump) and a variable displacement second hydraulic pump 2 (hereinafter referred to as a second hydraulic pump) include an engine ( Not shown).

상기 제1유압펌프(1)의 작동유에 의해 구동되는 아암실린더(3)가 공급유로(4)를 통해 제1유압펌프(1)에 연결된다.An arm cylinder 3 driven by the hydraulic oil of the first hydraulic pump 1 is connected to the first hydraulic pump 1 through the supply passage 4.

파일럿압력의 인가에 의해 절환시 상기 아암실린더(3)에 공급되는 작동유 흐름방향을 제어하는 아암 제어밸브(5)(MCV)가 상기 제1유압펌프(1)의 공급유로(4) 하류측에 설치된다.An arm control valve 5 (MCV) for controlling the hydraulic oil flow direction supplied to the arm cylinder 3 at the time of switching by the application of a pilot pressure is provided on the downstream side of the supply passage 4 of the first hydraulic pump 1. Is installed.

파일럿압력의 인가에 의해 절환시 상기 공급유로(4)에 압력을 형성하는 CBP(center by pass)밸브(6)가 상기 제1유압펌프(1)의 공급유로(4)중 상기 아암 제어밸브(5)보다 하류측에 설치된다.The arm control valve (CBP) of the supply flow path 4 of the first hydraulic pump 1 has a CBP (center by pass) valve 6 which forms a pressure in the supply flow path 4 at the time of switching by application of a pilot pressure. 5) is installed on the downstream side.

상기 제2유압펌프(2)의 작동유에 의해 구동되는 붐실린더(7) 및 버킷실린더(8)가 공급유로(9,9a)를 통해 상기 제2유압펌프(2)에 연결된다.The boom cylinder 7 and the bucket cylinder 8 driven by the working oil of the second hydraulic pump 2 are connected to the second hydraulic pump 2 through the supply passages 9 and 9a.

파일럿압력의 인가에 의해 절환시 상기 버킷실린더(8)에 공급되는 작동유 흐름방향을 제어하는 버킷 제어밸브(10)(MCV)가 상기 제2유압펌프(2)의 공급유로(9) 하류측에 설치된다.A bucket control valve 10 (MCV) for controlling the hydraulic oil flow direction supplied to the bucket cylinder 8 at the time of switching by the application of pilot pressure is provided on the downstream side of the supply passage 9 of the second hydraulic pump 2. Is installed.

파일럿압력의 인가에 의해 절환시 상기 붐실린더(7)에 공급되는 작동유 흐름방향을 제어하는 붐 제1제어밸브(11)(MCV)가 상기 제2유압펌프(2)의 공급유로(9) 상류측에 설치된다.A boom first control valve 11 (MCV) for controlling the flow direction of the hydraulic oil supplied to the boom cylinder 7 at the time of switching by the application of a pilot pressure is upstream of the supply flow path 9 of the second hydraulic pump 2. Is installed on the side.

파일럿압력의 인가에 의해 절환시 상기 제1유압펌프(1)의 작동유를 합류유로(12)를 통해 상기 버킷실린더(8) 또는 붐실린더(7)에 공급하는 붐 제2제어밸브(13)(MCV)가 상기 제1유압펌프(1)의 공급유로(4) 상류측에 설치된다.Boom second control valve 13 for supplying the hydraulic oil of the first hydraulic pump 1 to the bucket cylinder 8 or the boom cylinder 7 through the confluence passage 12 at the time of switching by application of pilot pressure. MCV) is provided upstream of the supply passage 4 of the first hydraulic pump 1.

전술한 구성에 의하면, 상기 붐실린더(7) 및 버킷실린더(8)를 동시에 구동시켜 복합작업하기 위해 조작레버(RCV)(미도시됨)를 조작하는 경우 파일럿압력의 인가에 의해 상기 붐 제1제어밸브(11) 및 버킷 제어밸브(10)가 절환된다.According to the above-described configuration, when operating the operation lever (RCV) (not shown) to drive the boom cylinder 7 and the bucket cylinder 8 at the same time for the composite work, the boom first by the application of a pilot pressure The control valve 11 and the bucket control valve 10 are switched.

따라서, 상기 제2유압펌프(2)의 작동유 일부는 상기 공급유로(9), 상기 붐 제1제어밸브(11)를 통과하여 붐실린더(7)의 라지챔버에 공급되고, 동시에 제2유압펌프(2)의 작동유 일부는 유로(9a), 상기 버킷 제어밸브(10)를 통과하여 상기 버킷실린더(8)의 라지챔버에 각각 공급된다.Therefore, a part of the hydraulic oil of the second hydraulic pump 2 is supplied to the large chamber of the boom cylinder 7 through the supply passage 9 and the boom first control valve 11 and at the same time, the second hydraulic pump. A part of the working oil of (2) passes through the flow path 9a and the bucket control valve 10 and is supplied to the large chamber of the bucket cylinder 8, respectively.

또한, 상기 조작레버의 조작에 의한 파일럿압력이 상기 붐 제2제어밸브(13)및 CBP밸브(6)에 동시에 인가되어 스풀을 절환시킨다. 따라서 상기 제1유압펌프(1)의 작동유 일부는 상기 붐 제2제어밸브(13), 아암 제어밸브(5), 합류유로(12) 및 버킷 제어밸브(10)를 통과하여 상기 버킷실린더(8)의 라지챔버에 공급된다. 동시에 제1유압펌프(1)의 작동유 일부는 상기 붐 제2제어밸브(13), 아암 제어밸브(5), 합류유로(12), 유로(9a) 및 붐 제1제어밸브(11)를 통과하여 붐실린더(7)의 라지챔버에 공급되므로 상기 제2유압펌프(2)로부터 공급되는 작동유와 합류된다.Further, the pilot pressure by the operation of the operation lever is simultaneously applied to the boom second control valve 13 and the CBP valve 6 to switch the spool. Accordingly, a part of the hydraulic oil of the first hydraulic pump 1 passes through the second boom control valve 13, the arm control valve 5, the confluence flow passage 12, and the bucket control valve 10 to pass through the bucket cylinder 8. Is supplied to the large chamber. At the same time, a part of the hydraulic oil of the first hydraulic pump 1 passes through the boom second control valve 13, the arm control valve 5, the joining flow passage 12, the flow path 9a and the boom first control valve 11. It is supplied to the large chamber of the boom cylinder 7 so that it is joined with the hydraulic oil supplied from the second hydraulic pump (2).

이때, 붐 업(boom up) 및 버킷 인(bucket in) 동작에 의해 복합작업할 경우 상기 붐실린더(7)에 발생되는 부하는 상기 버킷실린더(8)에 발생되는 부하보다 크게 된다. 이로 인해 복합작업시 상기 제1유압펌프(1)로부터 상기 붐실린더(7) 및 버킷실린더(8)에 합류되도록 공급되는 작동유는 상기 붐실린더(7)보다 상기 버킷실린더(8)에 우선적으로 공급되어 합류된다.At this time, the load generated in the boom cylinder 7 is greater than the load generated in the bucket cylinder 8 when performing a complex operation by boom up and bucket in operation. As a result, the hydraulic fluid supplied to join the boom cylinder 7 and the bucket cylinder 8 from the first hydraulic pump 1 in the combined operation is preferentially supplied to the bucket cylinder 8 rather than the boom cylinder 7. And join.

전술한 바와 같이 붐 업 및 버킷 인 동작에 의해 복합작업시, 상기 제1유압펌프(1)로부터 상기 붐실린더(7) 및 버킷실린더(8)에 공급되어 합류되는 유량 차이로 인한 불균형으로 버킷 인 및 붐 업 동작 간에 불균형을 초래하게 된다.As described above, during the composite operation by the boom up and the bucket in operation, the bucket in is unbalanced due to the difference in flow rate supplied from the first hydraulic pump 1 to the boom cylinder 7 and the bucket cylinder 8 and joined. And an imbalance between the boom up operation.

즉, 상기 붐실린더(7) 및 버킷실린더(8)를 동시에 구동시켜 복합작업시, 버킷 인 동작이 먼저 완전하게 이루어진 후, 붐 업 동작이 뒤따라 빠르게 이루어지게 되므로 작업능률이 떨어지는 문제점을 갖는다.That is, when the boom cylinder (7) and the bucket cylinder (8) is driven simultaneously at the time of the composite work, the bucket-in operation is first made completely, then the boom up operation is made quickly followed by the problem that the work efficiency is lowered.

따라서, 본 발명은 전술한 문제점을 해결하고자 하는 것으로, 복수의 작업장치를 동시에 조작하여 복합작업할 경우 유압펌프로부터 작업장치에 공급되는 합류 유량을 제어하여 작업장치 간의 동작 균형을 맞출 수 있도록 한 건설기계용 유압회로를 제공하는 것을 목적으로 한다.Therefore, the present invention is to solve the above-mentioned problems, the construction to control the combined flow rate supplied from the hydraulic pump to the working device when operating a plurality of working devices at the same time to balance the operation between the working devices It is an object to provide a hydraulic circuit for a machine.

상기 및 기타 본 발명의 목적을 달성하기 위하여 본 발명의 일 실시예에 따르면, 제1유압펌프 및 제2유압펌프;According to an embodiment of the present invention to achieve the above and other objects of the present invention, the first hydraulic pump and the second hydraulic pump;

상기 제1유압펌프의 공급유로 최하류측에 설치되는 CBP밸브;A CBP valve installed at a downstream side of a supply flow path of the first hydraulic pump;

상기 제2유압펌프의 작동유에 의해 구동되는 붐실린더 및 버킷실린더;A boom cylinder and a bucket cylinder driven by the operating oil of the second hydraulic pump;

상기 제2유압펌프의 공급유로 하류측에 설치되고, 절환시 상기 버킷실린더에 공급되는 작동유 흐름방향을 제어하는 버킷 제어밸브;A bucket control valve installed downstream of the supply flow path of the second hydraulic pump and controlling a flow direction of the hydraulic oil supplied to the bucket cylinder during switching;

상기 제2유압펌프의 공급유로 상류측에 설치되고, 절환시 상기 붐실린더에 공급되는 작동유 흐름방향을 제어하는 붐 제1제어밸브;A boom first control valve installed at an upstream side of a supply flow path of the second hydraulic pump and configured to control a flow direction of the hydraulic oil supplied to the boom cylinder during switching;

상기 제1유압펌프의 공급유로 상류측에 설치되고, 절환시 상기 제1유압펌프의 작동유를 합류유로를 통해 상기 버킷실린더 또는 붐실린더에 공급하는 붐 제2제어밸브;A second boom control valve installed at an upstream side of a supply flow path of the first hydraulic pump and configured to supply hydraulic oil of the first hydraulic pump to the bucket cylinder or the boom cylinder through a confluence flow path at the time of switching;

상기 합류유로에 설치되는 버킷 합류 차단밸브, 상기 버킷 합류 차단밸브는 상기 붐실린더 및 버킷실린더의 구동에 의해 복합작업시 인가되는 파일럿압력에 의해 절환되고, 절환시 상기 합류유로의 닫힘으로 인해 상기 제1유압펌프로부터 상기 버킷실린더에 공급되는 합류 유량을 차단하고 상기 붐 제2제어밸브를 통해 상기 붐실린더에 합류 유량을 공급하게 됨;을 특징으로 하는 건설기계용 유압회로를 제공한다.The bucket joining shutoff valve installed in the joining flow path and the bucket joining shutoff valve are switched by a pilot pressure applied during a complex operation by driving the boom cylinder and the bucket cylinder, and the switching is performed by closing the joining flow path. It provides a hydraulic circuit for a construction machine, characterized in that for blocking the flow rate of the confluence supplied to the bucket cylinder from the hydraulic pump and supplying the flow rate of confluence to the boom cylinder through the second boom control valve.

전술한 구성을 갖는 본 발명에 따르면, 붐-업 및 버킷-인 동작에 의해 복합작업할 경우 유압펌프로부터 작업장치에 공급되는 합류 유량을 제어함에 따라 작업장치 간의 동작 균형을 맞출 수 있어 작업능률을 높일 수 있는 효과가 있다.According to the present invention having the above-described configuration, when combined work by the boom-up and bucket-in operation, it is possible to balance the operation between the working devices by controlling the combined flow rate supplied from the hydraulic pump to the working device to improve the work efficiency. It can increase the effect.

도 1은 종래 기술에 의한 붐 업 및 버킷 인 상태의 건설기계용 유압회로도,1 is a hydraulic circuit diagram for a construction machine in a boom up and bucket in state according to the prior art,

도 2는 본 발명의 일 실시예에 의한 붐 업 및 버킷 인 상태의 건설기계용 유압회로도,2 is a hydraulic circuit diagram for a construction machine in a boom up and bucket in state according to an embodiment of the present invention;

도 3은 본 발명의 일 실시예에 의한 건설기계용 유압회로에서, 붐 업 단독 구동상태를 설명하기 위한 도면,3 is a view for explaining a boom up alone driving state in the hydraulic circuit for construction machinery according to an embodiment of the present invention,

도 4는 본 발명의 일 실시예에 의한 건설기계용 유압회로에서, 버킷 인 단독구동상태를 설명하기 위한 도면이다.4 is a view for explaining the bucket-in alone driving state in the hydraulic circuit for construction machinery according to an embodiment of the present invention.

〈도면의 주요 부분에 대한 참조 부호의 설명〉<Explanation of reference numerals for the main parts of the drawings>

1; 제1유압펌프One; 1st hydraulic pump

2; 제2유압펌프2; 2nd hydraulic pump

3; 아암실린더3; Arm cylinder

4,9; 공급유로4,9; Supply Euro

5; 아암 제어밸브5; Arm Control Valve

6; CBP밸브6; CBP Valve

7; 붐실린더7; Boom cylinder

8; 버킷실린더8; Bucket cylinder

10; 버킷 제어밸브10; Bucket Control Valve

11; 붐 제1제어밸브11; Boom 1st Control Valve

12; 합류유로12; Euro

13; 붐 제2제어밸브13; Boom 2nd Control Valve

14; 버킷 합류 차단밸브14; Bucket confluence shutoff valve

15; 병렬유로15; Parallel euros

16; 오리피스16; Orifice

이하, 첨부도면을 참조하여 본 발명의 바람직한 실시예에 따른 건설기계용 유압회로를 상세히 설명하기로 한다.Hereinafter, a hydraulic circuit for a construction machine according to a preferred embodiment of the present invention with reference to the accompanying drawings will be described in detail.

도 2는 본 발명의 일 실시예에 의한 붐 업 및 버킷 인 상태의 건설기계용 유압회로도이고, 도 3은 본 발명의 일 실시예에 의한 건설기계용 유압회로에서, 붐 업 단독 구동시의 회로이며, 도 4는 본 발명의 일 실시예에 의한 건설기계용 유압회로에서, 버킷 인 단독 구동시의 회로이다.2 is a hydraulic circuit diagram for a construction machine in a boom up and a bucket-in state according to an embodiment of the present invention, Figure 3 is a circuit for driving the boom up alone in the hydraulic circuit for construction machinery according to an embodiment of the present invention 4 is a circuit for driving a bucket alone in a hydraulic circuit for a construction machine according to an embodiment of the present invention.

도 2 내지 도 4를 참조하면, 본 발명의 일 실시예에 따른 건설기계용 유압회로는, 가변용량형 제1유압펌프(이하 제1유압펌프 라고 함)(1) 및 가변용량형 제2유압펌프(이하 제2유압펌프 라고 함)(2)가 엔진(미도시됨) 등에 연결된다.2 to 4, the hydraulic circuit for a construction machine according to an embodiment of the present invention, the variable displacement first hydraulic pump (hereinafter referred to as the first hydraulic pump) (1) and the variable displacement second hydraulic pressure A pump (hereinafter referred to as a second hydraulic pump) 2 is connected to the engine (not shown) or the like.

상기 제1유압펌프(1)의 작동유에 의해 구동되는 아암실린더(3)가 공급유로(4)를 통해 상기 제1유압펌프(1)에 연결된다.An arm cylinder 3 driven by the hydraulic oil of the first hydraulic pump 1 is connected to the first hydraulic pump 1 through a supply passage 4.

파일럿압력의 인가에 의해 절환시 상기 아암실린더(3)에 공급되는 작동유 흐름방향을 제어하는 아암 제어밸브(5)(MCV)가 상기 제1유압펌프(1)의 공급유로(4) 하류측에 설치된다.An arm control valve 5 (MCV) for controlling the hydraulic oil flow direction supplied to the arm cylinder 3 at the time of switching by the application of a pilot pressure is provided on the downstream side of the supply passage 4 of the first hydraulic pump 1. Is installed.

파일럿압력의 인가에 의해 절환시 상기 공급유로(4)에 압력을 형성하는 CBP밸브가 상기 제1유압펌프(1)의 공급유로(4)중 상기 아암 제어밸브(5)보다 하류측에 설치된다.A CBP valve for forming a pressure in the supply passage 4 at the time of switching by the application of a pilot pressure is installed downstream of the arm control valve 5 in the supply passage 4 of the first hydraulic pump 1. .

상기 제2유압펌프(2)의 작동유에 의해 구동되는 붐실린더(7) 및 버킷실린더(8)가 공급유로(9,9a)를 통해 상기 제2유압펌프(2)에 연결된다.The boom cylinder 7 and the bucket cylinder 8 driven by the working oil of the second hydraulic pump 2 are connected to the second hydraulic pump 2 through the supply passages 9 and 9a.

파일럿압력의 인가에 의해 절환시 상기 버킷실린더(8)에 공급되는 작동유 흐름방향을 제어하는 버킷 제어밸브(10)(MCV)가 상기 제2유압펌프(2)의 공급유로(9) 하류측에 설치된다.A bucket control valve 10 (MCV) for controlling the hydraulic oil flow direction supplied to the bucket cylinder 8 at the time of switching by the application of pilot pressure is provided on the downstream side of the supply passage 9 of the second hydraulic pump 2. Is installed.

파일럿압력의 인가에 의해 절환시 상기 붐실린더(7)에 공급되는 작동유 흐름방향을 제어하는 붐 제1제어밸브(11)(MCV)가 상기 제2유압펌프(2)의 공급유로(9) 상류측에 설치된다.A boom first control valve 11 (MCV) for controlling the flow direction of the hydraulic oil supplied to the boom cylinder 7 at the time of switching by the application of a pilot pressure is upstream of the supply flow path 9 of the second hydraulic pump 2. Is installed on the side.

파일럿압력의 인가에 의해 절환시 상기 제1유압펌프(1)의 작동유를 합류유로(12)를 통해 상기 버킷실린더(8) 또는 붐실린더(7)에 공급하는 붐 제2제어밸브(13)(MCV)가 상기 제1유압펌프(1)의 공급유로(4) 상류측에 설치된다.Boom second control valve 13 for supplying the hydraulic oil of the first hydraulic pump 1 to the bucket cylinder 8 or the boom cylinder 7 through the confluence passage 12 at the time of switching by application of pilot pressure. MCV) is provided upstream of the supply passage 4 of the first hydraulic pump 1.

상기 붐실린더(7) 및 버킷실린더(8)의 구동에 의해 복합작업시 인가되는 파일럿압력에 의해 절환되고, 절환시 상기 합류유로(12)의 닫힘으로 인해 상기 제1유압펌프(1)로부터 상기 버킷실린더(8)에 공급되는 합류 유량을 차단하고, 상기 붐 제2제어밸브(13)를 통과시켜 상기 붐실린더(7)에 합류 유량을 공급하기 위해 버킷 합류 차단밸브(14)가 상기 합류유로(12)에 설치된다.The boom cylinder 7 and the bucket cylinder 8 is switched by the pilot pressure applied during the compounding operation, and the switching from the first hydraulic pump 1 due to the closing of the confluence passage 12 In order to block the flow rate of confluence supplied to the bucket cylinder 8 and to pass the flow rate to the boom cylinder 7 through the boom second control valve 13, the bucket flow rate blocking valve 14 is connected to the flow path. It is installed at (12).

상기 버킷 합류 차단밸브(14) 및 CBP밸브(6)는 복합작업시 붐 업(boom up) 구동시키기 위해 상기 붐 제2제어밸브(13)에 인가되는 파일럿압력이 동시에 인가되어 절환된다.The bucket confluence shutoff valve 14 and the CBP valve 6 are switched by simultaneously applying the pilot pressure applied to the second boom control valve 13 to drive the boom up during the combined operation.

상기 아암 제어밸브(5) 및 붐 제2제어밸브(13)의 입구측에서 상기 제1유압펌프(1)의 공급유로(4)에 분기 접속되는 병렬유로(15)에 설치되는 오리피스(16)를 구비할 수 있다.Orifice 16 provided in parallel passage 15 branched to supply passage 4 of first hydraulic pump 1 at the inlet side of arm control valve 5 and boom second control valve 13. It may be provided.

전술한 구성에 따르면, 가) 붐 업 단독 구동을 첨부도면을 따라 설명한다.According to the above-described configuration, a) Boom-up single drive will be described according to the accompanying drawings.

도 3에서와 같이, 상기 조작레버(미도시됨)의 조작에 의해 인가되는 파일럿압력에 의해 상기 붐 제1제어밸브(11)의 스풀을 절환시킨다. 이로 인해 상기 제2유압펌프(2)의 작동유는 상기 공급유로(9) 및 붐 제1제어밸브(11)를 통과하여 상기 붐실린더(7)의 라지챔버에 공급된다.As shown in FIG. 3, the spool of the boom first control valve 11 is switched by the pilot pressure applied by the operation of the operation lever (not shown). Therefore, the hydraulic oil of the second hydraulic pump 2 passes through the supply passage 9 and the boom first control valve 11 and is supplied to the large chamber of the boom cylinder 7.

또한, 상기 조작레버의 조작에 의한 파일럿압력이 상기 붐 제2제어밸브(13)에 인가되어 스풀을 절환시킨다. 상기 붐 제2제어밸브(13)에 인가되는 파일럿압력이 상기 CBP밸브(6)에 동시에 인가되어 스풀을 절환시켜 개구부를 닫게 되므로 상기 공급유로(4)에 압력이 형성된다.In addition, the pilot pressure by the operation of the operation lever is applied to the boom second control valve 13 to switch the spool. Since the pilot pressure applied to the second boom control valve 13 is simultaneously applied to the CBP valve 6 to switch the spool to close the opening, pressure is formed in the supply passage 4.

이로 인해 상기 제1유압펌프(1)의 작동유는 상기 붐 제2제어밸브(13), 아암 제어밸브(5), 버킷 합류 차단밸브(14), 합류유로(12), 유로(9a) 및 붐 제1제어밸브(11)를 통과하여 붐실린더(7)의 라지챔버에 공급되므로, 상기 제2유압펌프(2)로부터 공급되는 작동유와 합류된다. 이때 신장구동되는 상기 붐실린더(7)의 스몰챔버로부터 배출되는 작동유는 상기 붐 제1제어밸브(11)를 통과하여 작동유탱크로 리턴된다.Therefore, the hydraulic oil of the first hydraulic pump 1 is connected to the boom second control valve 13, the arm control valve 5, the bucket joining shutoff valve 14, the joining flow passage 12, the flow path 9a and the boom. Since it is supplied to the large chamber of the boom cylinder 7 through the 1st control valve 11, it joins with the hydraulic oil supplied from the said 2nd hydraulic pump 2. As shown in FIG. At this time, the hydraulic oil discharged from the small chamber of the boom cylinder 7 which is extended and driven passes through the boom first control valve 11 and is returned to the hydraulic oil tank.

따라서, 상기 제1,2유압펌프(1,2)로부터 공급되는 작동유에 의해 상기 붐실린더(7)를 구동시켜 붐 업 구동시킬 수 있게 된다.Therefore, the boom cylinder 7 may be driven by the hydraulic oil supplied from the first and second hydraulic pumps 1 and 2, thereby driving the boom up.

나) 버킷 인 단독 구동을 첨부도면을 따라 설명한다.B) The independent operation of the bucket will be described according to the accompanying drawings.

도 4에서와 같이, 상기 조작레버(미도시됨)의 조작에 의해 인가되는 파일럿압력에 의해 상기 버킷 제어밸브(10)의 스풀을 절환시킨다. 이로 인해 상기 제2유압펌프(2)의 작동유는 상기 유로(9a) 및 버킷 제어밸브(10)를 통과하여 상기 버킷실린더(8)의 라지챔버에 공급된다.As shown in Figure 4, the spool of the bucket control valve 10 is switched by the pilot pressure applied by the operation of the operation lever (not shown). As a result, the hydraulic oil of the second hydraulic pump 2 passes through the flow path 9a and the bucket control valve 10 and is supplied to the large chamber of the bucket cylinder 8.

또한, 상기 조작레버의 조작에 의한 파일럿압력이 상기 CBP밸브(6)에 인가되어 스풀을 절환시켜 개구부를 닫게 되므로 상기 공급유로(4)에 압력이 형성된다.In addition, since the pilot pressure by the operation of the operation lever is applied to the CBP valve 6 to switch the spool to close the opening, pressure is formed in the supply passage 4.

이로 인해 상기 제1유압펌프(1)의 작동유가 상기 붐 제2제어밸브(13), 아암 제어밸브(5), 버킷 합류 차단밸브(14)를 통과하여 합류유로(12)에 공급되므로, 상기 제2유압펌프(2)로부터 유로(9a)를 통해 공급되는 작동유와 합류된 후 상기 버킷 제어밸브(10)를 통과하여 버킷실린더(8)의 라지챔버에 공급된다.As a result, the hydraulic oil of the first hydraulic pump 1 passes through the second boom control valve 13, the arm control valve 5, and the bucket joining shutoff valve 14 to be supplied to the joining flow path 12. After joining the hydraulic oil supplied from the second hydraulic pump (2) through the flow path (9a) through the bucket control valve 10 is supplied to the large chamber of the bucket cylinder (8).

따라서, 상기 제1,2유압펌프(1,2)로부터 공급되는 작동유에 의해 상기 버킷실린더(8)를 구동시켜 버킷 인 구동시킬 수 있게 된다.Accordingly, the bucket cylinder 8 may be driven by the hydraulic oil supplied from the first and second hydraulic pumps 1 and 2 to drive the bucket in.

다) 붐 업 및 버킷 인 복합 구동을 첨부도면을 따라 설명한다.C) Combined drive of boom up and bucket will be explained according to attached drawings.

도 2에서와 같이, 상기 조작레버의 조작에 의해 인가되는 파일럿압력에 의해 상기 붐 제1제어밸브(11) 및 버킷 제어밸브(10)의 스풀을 절환시킨다. 이로 인해 상기 제2유압펌프(2)의 작동유 일부는 공급유로(9) 및 붐 제1제어밸브(11)를 통과하여 붐실린더(7)의 라지챔버에 공급되고, 동시에 상기 제2유압펌프(2)의 작동유 일부는 유로(9a) 및 버킷 제어밸브(10)를 통과하여 버킷실린더(8)의 라지챔버에 공급된다.As shown in FIG. 2, the spool of the boom first control valve 11 and the bucket control valve 10 is switched by the pilot pressure applied by the operation of the operation lever. Therefore, a part of the hydraulic oil of the second hydraulic pump 2 passes through the supply passage 9 and the boom first control valve 11 and is supplied to the large chamber of the boom cylinder 7, and at the same time the second hydraulic pump ( A part of the hydraulic oil of 2) passes through the flow path 9a and the bucket control valve 10 and is supplied to the large chamber of the bucket cylinder 8.

한편, 상기 조작레버의 조작에 의한 파일럿압력이 상기 붐 제2제어밸브(13)에 인가되어 스풀을 절환시킨다. 이때 상기 붐 제2제어밸브(13)의 스풀이 절환되는 경우에도 상기 붐 제2제어밸브(13)를 통과하는 제1유압펌프(1)의 공급유로(4)는 항시 개방되어 있다. 따라서 상기 제1유압펌프(1)의 작동유를 오리피스(16)가 설치된 병렬유로(15)를 통해 아암 제어밸브(5)쪽으로 공급되는 것보다 공급유로(4)를 통해 아암 제어밸브(5)쪽으로 공급하는 경우가 압력 손실을 방지할 수 있게 된다.On the other hand, the pilot pressure by the operation of the operation lever is applied to the boom second control valve 13 to switch the spool. At this time, even when the spool of the boom second control valve 13 is switched, the supply passage 4 of the first hydraulic pump 1 passing through the boom second control valve 13 is always open. Therefore, the hydraulic oil of the first hydraulic pump 1 is supplied to the arm control valve 5 through the supply passage 4 rather than being supplied to the arm control valve 5 through the parallel passage 15 provided with the orifice 16. When supplying, it becomes possible to prevent a pressure loss.

상기 붐 제2제어밸브(13)를 절환시키기 위해 인가되는 파일럿압력이 상기 CBP밸브(6) 및 버킷 합류 차단밸브(14)에 동시에 인가되어 스플을 절환시킨다(도 2의 도시된 상태). A pilot pressure applied to switch the boom second control valve 13 is simultaneously applied to the CBP valve 6 and the bucket confluence shutoff valve 14 to switch the spool (shown in FIG. 2).

따라서, 상기 버킷 합류 차단밸브(14)의 절환시 상기 합류유로(12)의 닫힘으로 인해 상기 제1유압펌프(1)의 작동유가 상기 합류유로(12)를 따라 상기 버킷실린더(8)에 공급되는 것을 차단하게 된다.Accordingly, when the bucket confluence shutoff valve 14 is switched, the operating oil of the first hydraulic pump 1 is supplied to the bucket cylinder 8 along the confluence passage 12 due to the closing of the confluence passage 12. Will be blocked.

반면에, 상기 제1유압펌프(1)의 작동유는 상기 붐 제2제어밸브(13)를 통과하여 상기 붐실린더(7)의 라지챔버에 공급되므로, 상기 제2유압펌프(2)로부터 붐 제2제어밸브(13)를 통과하여 공급되는 작동유와 합류되어진다.On the other hand, since the hydraulic oil of the first hydraulic pump 1 passes through the second boom control valve 13 and is supplied to the large chamber of the boom cylinder 7, the boom is removed from the second hydraulic pump 2. The hydraulic fluid supplied through the two control valves 13 is joined.

전술한 바와 같이 붐 업 및 버킷 인 구동에 의해 복합작업할 경우, 상기 제1유압펌프(1)로부터 상기 버킷실린더(8)의 라지챔버에 합류되도록 작동유 공급되는 것을 차단하게 된다.As described above, when the composite work is performed by the boom-up and the bucket-in driving, the hydraulic oil is blocked from being supplied to the large chamber of the bucket cylinder 8 from the first hydraulic pump 1.

따라서 붐 업 및 버킷 인 동시구동에 의한 복합작업시 제1유압펌프(1)의 작동유를 상기 붐실린더(7)에 공급하여 합류시키므로 붐 업 및 버킷 인 동작이 균형을 이루게 되므로 작업능률을 높일 수 있다.Therefore, when the boom-up and bucket-in simultaneous operation, the hydraulic fluid of the first hydraulic pump (1) is supplied to the boom cylinder (7) to join the boom-up and bucket-in operation is balanced, thereby improving work efficiency have.

여기에서, 상술한 본 발명에서는 바람직한 실시예를 참조하여 설명하였지만, 해당 기술분야에서 숙련된 당업자는 하기의 특허청구범위에 기재된 본 발명의 사상 및 영역으로부터 벗어나지 않는 범위 내에서 본 발명을 다양하게 수정 및 변경할 수 있음을 이해할 수 있을 것이다.Herein, although the present invention has been described with reference to the preferred embodiments, those skilled in the art will variously modify the present invention without departing from the spirit and scope of the invention as set forth in the claims below. And can be changed.

전술한 구성을 갖는 본 발명에 따르면, 굴삭기와 같은 건설기계의 복수의 작업장치를 동시에 조작하여 복합작업할 경우 유압펌프로부터 작업장치에 공급되는 합류 유량을 제어하여 작업성을 향상시킬 수 있는 효과가 있다.According to the present invention having the above-described configuration, when operating a plurality of work devices of a construction machine such as an excavator at the same time combined work to control the combined flow rate supplied from the hydraulic pump to the work device has the effect of improving workability have.

Claims (3)

제1유압펌프 및 제2유압펌프;A first hydraulic pump and a second hydraulic pump; 상기 제1유압펌프의 공급유로 최하류측에 설치되는 CBP밸브;A CBP valve installed at a downstream side of a supply flow path of the first hydraulic pump; 상기 제2유압펌프의 작동유에 의해 구동되는 붐실린더 및 버킷실린더;A boom cylinder and a bucket cylinder driven by the operating oil of the second hydraulic pump; 상기 제2유압펌프의 공급유로 하류측에 설치되고, 절환시 상기 버킷실린더에 공급되는 작동유 흐름방향을 제어하는 버킷 제어밸브;A bucket control valve installed downstream of the supply flow path of the second hydraulic pump and controlling a flow direction of the hydraulic oil supplied to the bucket cylinder during switching; 상기 제2유압펌프의 공급유로 상류측에 설치되고, 절환시 상기 붐실린더에 공급되는 작동유 흐름방향을 제어하는 붐 제1제어밸브;A boom first control valve installed at an upstream side of a supply flow path of the second hydraulic pump and configured to control a flow direction of the hydraulic oil supplied to the boom cylinder during switching; 상기 제1유압펌프의 공급유로 상류측에 설치되고, 절환시 상기 제1유압펌프의 작동유를 합류유로를 통해 상기 버킷실린더 또는 붐실린더에 공급하는 붐 제2제어밸브;A second boom control valve installed at an upstream side of a supply flow path of the first hydraulic pump and configured to supply hydraulic oil of the first hydraulic pump to the bucket cylinder or the boom cylinder through a confluence flow path at the time of switching; 상기 합류유로에 설치되는 버킷 합류 차단밸브, 상기 버킷 합류 차단밸브는 상기 붐실린더 및 버킷실린더의 구동에 의해 복합작업시 인가되는 파일럿압력에 의해 절환되고, 절환시 상기 합류유로의 닫힘으로 인해 상기 제1유압펌프로부터 상기 버킷실린더에 공급되는 합류 유량을 차단하고 상기 붐 제2제어밸브를 통해 상기 붐실린더에 합류 유량을 공급하게 됨;을 특징으로 하는 건설기계용 유압회로.The bucket joining shutoff valve installed in the joining flow path and the bucket joining shutoff valve are switched by a pilot pressure applied during a complex operation by driving the boom cylinder and the bucket cylinder, and the switching is performed by closing the joining flow path. 1 to block the confluence flow rate supplied from the hydraulic pump to the bucket cylinder and supply the confluence flow rate to the boom cylinder through the boom second control valve. 제1항에 있어서, 상기 버킷 합류 차단밸브 및 CBP밸브는The method of claim 1, wherein the bucket confluence shutoff valve and the CBP valve 복합작업시 붐 업 구동시키기 위해 상기 붐 제2제어밸브에 인가되는 파일럿압력이 동시에 인가되어 절환되는 것을 특징으로 하는 건설기계용 유압회로.The hydraulic circuit for a construction machine, characterized in that the pilot pressure applied to the second boom control valve is applied at the same time in order to drive the boom up during the combined operation is switched. 제1항에 있어서,The method of claim 1, 상기 붐 제2제어밸브의 입구 또는 출구 측에서 상기 제1유압펌프의 공급유로에 분기 접속되는 병렬유로에 설치되는 오리피스를 구비하는 것을 특징으로 하는 건설기계용 유압회로.And an orifice installed in a parallel flow path branched to a supply flow path of the first hydraulic pump at an inlet or an outlet of the second control valve of the boom.
PCT/KR2015/006319 2015-06-22 2015-06-22 Hydraulic circuit for construction equipment Ceased WO2016208780A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/KR2015/006319 WO2016208780A1 (en) 2015-06-22 2015-06-22 Hydraulic circuit for construction equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/KR2015/006319 WO2016208780A1 (en) 2015-06-22 2015-06-22 Hydraulic circuit for construction equipment

Publications (1)

Publication Number Publication Date
WO2016208780A1 true WO2016208780A1 (en) 2016-12-29

Family

ID=57585922

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2015/006319 Ceased WO2016208780A1 (en) 2015-06-22 2015-06-22 Hydraulic circuit for construction equipment

Country Status (1)

Country Link
WO (1) WO2016208780A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111945803A (en) * 2020-08-25 2020-11-17 中国铁建重工集团股份有限公司 Shovel loader

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20100023332A (en) * 2008-08-21 2010-03-04 볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비 Hydraulic system of construction equipment
KR20110072587A (en) * 2009-12-23 2011-06-29 볼보 컨스트럭션 이큅먼트 에이비 Hydraulic System for Construction Equipment
KR20120086288A (en) * 2009-10-15 2012-08-02 히다찌 겐끼 가부시키가이샤 Hydraulic system for operating machine
KR20140074306A (en) * 2011-10-07 2014-06-17 볼보 컨스트럭션 이큅먼트 에이비 Control system for operating work device for construction machine
WO2014092222A1 (en) * 2012-12-14 2014-06-19 볼보 컨스트럭션 이큅먼트 에이비 Hydraulic circuit for construction machines

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20100023332A (en) * 2008-08-21 2010-03-04 볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비 Hydraulic system of construction equipment
KR20120086288A (en) * 2009-10-15 2012-08-02 히다찌 겐끼 가부시키가이샤 Hydraulic system for operating machine
KR20110072587A (en) * 2009-12-23 2011-06-29 볼보 컨스트럭션 이큅먼트 에이비 Hydraulic System for Construction Equipment
KR20140074306A (en) * 2011-10-07 2014-06-17 볼보 컨스트럭션 이큅먼트 에이비 Control system for operating work device for construction machine
WO2014092222A1 (en) * 2012-12-14 2014-06-19 볼보 컨스트럭션 이큅먼트 에이비 Hydraulic circuit for construction machines

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111945803A (en) * 2020-08-25 2020-11-17 中国铁建重工集团股份有限公司 Shovel loader

Similar Documents

Publication Publication Date Title
WO2012091184A1 (en) Energy recycling system for a construction apparatus
WO2012121427A1 (en) Hydraulic circuit for pipe layer
WO2013051740A1 (en) Control system for operating work device for construction machine
WO2013022131A1 (en) Hydraulic control system for construction machinery
WO2013176298A1 (en) Hydraulic system for construction machinery
WO2012091182A1 (en) Hydraulic pump for construction machinery
WO2014208795A1 (en) Hydraulic circuit for construction machinery having floating function and method for controlling floating function
WO2013062156A1 (en) Hybrid excavator having a system for reducing actuator shock
WO2016111391A1 (en) Flow control valve for construction machine
WO2012091187A1 (en) Boom-swivel compound drive hydraulic control system of construction machine
WO2013008964A1 (en) Hydraulic actuator damping control system for construction machinery
WO2015012423A1 (en) Hydraulic circuit for construction machine
WO2014017685A1 (en) Hydraulic system for construction machine
WO2015064785A1 (en) Flow control valve for construction equipment, having floating function
WO2016195134A1 (en) Hydraulic circuit for construction machine
WO2013111950A1 (en) Hydraulic pressure control device for swing motor for construction machinery
WO2012026633A1 (en) Device for controlling construction equipment
WO2013089295A1 (en) Travel control system for construction machinery
WO2016208780A1 (en) Hydraulic circuit for construction equipment
WO2013183795A1 (en) Driving control method for construction machine
WO2014034969A1 (en) Hydraulic system for construction machinery
WO2016093378A1 (en) Flow rate control device for construction machine
WO2016108300A1 (en) Control valve for construction equipment
WO2014092222A1 (en) Hydraulic circuit for construction machines
WO2014014131A1 (en) Method for controlling hydraulic system for construction machine

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 15896414

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 15896414

Country of ref document: EP

Kind code of ref document: A1