KR101250083B1 - Hydraulic control apparatus for a log loader excavator - Google Patents

Hydraulic control apparatus for a log loader excavator Download PDF

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KR101250083B1
KR101250083B1 KR1020050132829A KR20050132829A KR101250083B1 KR 101250083 B1 KR101250083 B1 KR 101250083B1 KR 1020050132829 A KR1020050132829 A KR 1020050132829A KR 20050132829 A KR20050132829 A KR 20050132829A KR 101250083 B1 KR101250083 B1 KR 101250083B1
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South Korea
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heel
pressure
control
hydraulic
pilot
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KR1020050132829A
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Korean (ko)
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KR20070070352A (en
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주기준
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두산인프라코어 주식회사
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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2264—Arrangements or adaptations of elements for hydraulic drives
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2221—Control of flow rate; Load sensing arrangements
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2264—Arrangements or adaptations of elements for hydraulic drives
    • E02F9/2267—Valves or distributors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2200/00—Type of vehicle
    • B60Y2200/40—Special vehicles
    • B60Y2200/41—Construction vehicles, e.g. graders, excavators
    • B60Y2200/412—Excavators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • 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
    • F15B2211/40—Flow control
    • F15B2211/405—Flow control characterised by the type of flow control means or valve

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

Abstract

본 발명은 로그 로더 굴삭기의 유압제어장치에 관한 것으로, 특히 암실린더에 2속작동압유를 공급하는 암2속 제어스풀은 제1컨트롤밸브그룹에 구비되고, 힐실린더에 압유를 공급하는 힐제어스풀은 상기 제2컨트롤밸브그룹에 구비되며,

메인유압펌프중 제1컨트롤밸브그룹에 접속된 제2메인유압펌프의 압유를 상기 힐제어스풀에 압유를 공급하는 제1메인유압펌프의 압유에 합류시키는 펌프합류라인과, 힐제어스풀을 절환시키는 힐파이롯압력을 검출하는 힐파이롯압력 검출수단과,

상기 힐파이롯압력 검출수단에서 검출한 힐파이롯압력이 소정 압력 이상인 경우에 상기 펌프합류라인을 개방하고, 힐파이롯압력이 소정압력 이하인 경우에는 상기 펌프합류라인을 차단하는 스톱밸브를 구비한다.

Figure R1020050132829

굴삭기, 옵션장치, 유압제어

The present invention relates to a hydraulic control device of a log loader excavator, and in particular, a second speed control spool for supplying a second speed working pressure oil to an arm cylinder is provided in the first control valve group, and a heel control spool for supplying pressure oil to the heel cylinder. Is provided in the second control valve group,

A pump confluence line for joining the pressure oil of the second main hydraulic pump connected to the first control valve group among the main hydraulic pumps to the pressure oil of the first main hydraulic pump for supplying the pressure to the heel control spool, and the heel control spool. Hill pilot pressure detecting means for detecting the hill pilot pressure,

A stop valve is provided to open the pump confluence line when the heel pilot pressure detected by the heel pilot pressure detection means is equal to or greater than a predetermined pressure, and to shut off the pump confluence line when the heel pilot pressure is equal to or less than the predetermined pressure. .

Figure R1020050132829

Excavator, Option, Hydraulic Control

Description

로그로더 굴삭기의 유압제어장치{ HYDRAULIC CONTROL APPARATUS FOR A LOG LOADER EXCAVATOR}HYDRAULIC CONTROL APPARATUS FOR A LOG LOADER EXCAVATOR}

도 1은 본 발명에 따른 로그로더 굴삭기의 유압제어장치에 대한 유압회로도이다. 1 is a hydraulic circuit diagram of a hydraulic control device of a log loader excavator according to the present invention.

※ 도면의 주요부분에 대한 부호의 설명 ※※ Explanation of code about main part of drawing ※

E: 엔진 9: 힐실린더E: Engine 9: Hill Cylinder

30A: 제1컨트롤밸브그룹 30B: 제2컨트롤밸브그룹30A: 1st control valve group 30B: 2nd control valve group

36: 힐제어스풀 31~39: 제어스풀 36: Hill control spool 31 ~ 39: Control spool

40: 보조펌프 41: 펌프합류라인40: auxiliary pump 41: pump confluence line

42: 스톱밸브 42A: 수압부42: stop valve 42A: hydraulic

45: 파이롯라인 50: 조이스틱밸브45: pilot line 50: joystick valve

53: 힐조이스틱밸브 54: 암조이스틱밸브53: heel joystick valve 54: female joystick valve

55: 힐파이롯압력 검출수단 56: 압력스위치55: Hill pilot pressure detecting means 56: Pressure switch

X,Y: 암2속 파이롯신호압 61: 암2속신호 차단밸브X, Y: Arm 2 speed pilot signal pressure 61: Arm 2 speed signal shutoff valve

Pa,Pb: 힐파일롯압력 62: 펌프합류제어밸브Pa, Pb: Hill pilot pressure 62: Pump confluence control valve

본 발명은 로그로더 굴삭기의 유압제어장치로서, 특히 로그로더의 힐의 2속동작을 제어하기 위한 유압제어장치에 관한 것이다. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic control apparatus for a log loader excavator, and more particularly, to a hydraulic control apparatus for controlling the second speed operation of the heel of a log loader.

로그 로더 굴삭기는 붐선단에 설치되는 통상의 버켓을 힐실린더에 의해 작동하는 힐로 교체한 장비로서, 통나무등을 집어서 운반하는 등 처리하는 용도로 사용된다. 그런데 통상의 유압회로로써는 힐실린더를 2속(고속)으로 작동시키기 어려워 작업을 원활하게 수행할 수 없는 단점이 있었다. The log loader excavator is a device in which a conventional bucket installed at a boom tip is replaced with a heel operated by a heel cylinder, and is used for handling, for example, collecting and transporting logs and the like. However, it is difficult to operate the heel cylinder at two speeds (high speeds) as a normal hydraulic circuit, and thus there is a disadvantage in that the work cannot be performed smoothly.

이에 본 발명은 상기 종래의 굴삭기의 유압제어장치가 가진 단점을 개선하기 위하여, 힐실린더에 충분한 유량을 공급하여 2속작동을 가능하게 함으로써 원활한 작업을 수행할 수 있는 로그로더 굴삭기의 유압제어장치를 제공함에 목적이 있다. 옵션장치를 제어하기 위한 서비스스풀을 컨트롤밸브 블록안에 설치하지 않음으로써 컨트롤밸브 구조를 간단하게 하고, 옵션장치와 다른 작업을 동시에 진행하는 복합작업시 유압펌프의 압유를 작업특성에 맞게 효율적으로 분배하여 작업성을 향상시킨 옵션장치 유압제어장치를 제공함에 목적이 있다.Accordingly, the present invention provides a hydraulic control device of a log loader excavator that can perform a smooth operation by supplying a sufficient flow rate to the heel cylinder to enable a two-speed operation in order to improve the disadvantages of the conventional hydraulic control device of the excavator. The purpose is to provide. By not installing a service spool to control the optional device in the control valve block, the control valve structure is simplified, and the hydraulic oil pressure of the hydraulic pump can be efficiently distributed to suit the characteristics of the work in the case of the complex work that simultaneously performs the optional device and other operations. An object of the present invention is to provide an optional device hydraulic control device with improved workability.

또 본 발명에서 상기 옵션장치 선택수단은 옵션장치 선택스위치와, 상기 옵션신호라인상에 설치되어 작동스풀의 수압부를 상기 보조펌프 또는 드레인탱크와 선택적으로 연결시키는 내부유로를 구비한 옵션장치 선택밸브로 이루어지고, 상기 옵션장치 선택밸브는 옵션장치 선택스위치와 연결되게 구성할 수도 있다. In the present invention, the option device selection means is an option device selection valve having an option device selection switch and an internal flow path installed on the option signal line to selectively connect the hydraulic pressure portion of the operation spool to the auxiliary pump or the drain tank. The option device selection valve may be configured to be connected to the option device selection switch.

또 본 발명은 옵션신호라인에 상기 옵션장치 선택수단의 선택시에 옵션신호라인를 통하여 압유를 공급받아 상기 옵션장치를 제어하는 옵션장치 제어수단을 더 구비한다. 그리고 상기 옵션장치 제어수단은 상기 옵션신호라인으로부터 압유를 공급받아 옵션장치의 제어밸브를 제어하는 옵션장치 작동밸브로 구성된다. The present invention further includes an option device control means for controlling the option device by receiving pressure oil through the option signal line when the option device selection means is selected. The option device control means is configured with an option device operation valve for controlling the control valve of the option device by receiving pressure oil from the option signal line.

그리고 본 발명은 2속파이롯라인상에 상기 옵션장치 선택수단의 선택시 상기 2속파이롯라인을 차단함과 동시에 2속스풀의 수압부를 드레인탱크와 연결시키는 2속신호차단수단을 더 포함할 수도 있다.And the present invention further comprises a second speed signal blocking means for connecting the water pressure portion of the second speed spool to the drain tank and at the same time blocking the second speed pilot line when selecting the option device selection means on the second speed pilot line; It may be.

상기한 구성으로 된 본 발명의 유압제어장치는 옵션장치 제어스풀을 별도로 컨트롤밸브그룹에 설치하지 않고 2속제어스풀을 사용하므로 컨트롤밸브의 구조가 간단해져 원가를 절감할 수 있고, 2속작업을 할 때에는 옵션장치쪽으로는 유압이 자동으로 차단되고 옵션장치를 작동시킬 때에는 2속용 압유가 차단되므로 메인유압펌프의 압유분배가 효율적으로 이루어져 작업성을 향상시킬 수 있게 된다. The hydraulic control device of the present invention having the above-described configuration uses a two-speed control spool without installing an optional device control spool separately to the control valve group, thereby simplifying the structure of the control valve, thereby reducing the cost and performing the two-speed operation. In this case, the hydraulic pressure is automatically cut off to the option device, and the oil pressure for the second speed is cut off when the option device is operated. Thus, the oil pressure distribution of the main hydraulic pump can be efficiently performed to improve workability.

상기 목적을 달성하기 위한 본 발명은, 엔진에 의해 작동하는 보조펌프와, 적어도 2개의 메인유압펌프와, 상기 메인유압펌프의 압유에 의해 작동하는 힐실린더를 포함한 복수개의 액츄에이터와, 상기 각각의 메인유압펌프로부터 압유를 공급받아 복수개의 액츄에이터로의 압유의 흐름을 제어하는 복수개의 제어스풀로 이루어진 제1,2컨트롤밸브그룹과, 상기 보조펌프의 압유를 감압시켜 상기 복수개의 제 어스풀을 제어하는 다수개의 조이스틱밸브를 구비한 로그로더 굴삭기의 유압제어장치에 있어서, The present invention for achieving the above object, a plurality of actuators including an auxiliary pump operated by the engine, at least two main hydraulic pump, a heel cylinder operated by the pressure oil of the main hydraulic pump, and each of the main The first and second control valve group consisting of a plurality of control spools for receiving the pressure oil from the hydraulic pump to control the flow of the pressure oil to the plurality of actuators, and the pressure of the auxiliary pump to reduce the pressure to control the plurality of gear pools In the hydraulic control device of a log loader excavator having a plurality of joystick valves,

암실린더에 2속작동압유를 공급하는 암2속 제어스풀은 상기 제1컨트롤밸브그룹에 구비되고, 힐실린더에 압유를 공급하는 힐제어스풀은 상기 제2컨트롤밸브그룹에 구비되며, An arm 2-speed control spool for supplying 2-speed operating pressure oil to a dark cylinder is provided in the first control valve group, and a heel control spool for supplying pressure oil to a heel cylinder is provided in the second control valve group.

상기 메인유압펌프중 제1컨트롤밸브그룹에 접속된 제2메인유압펌프의 압유를, 상기 힐제어스풀에 압유를 공급하는 제1메인유압펌프의 압유에 합류시키는 펌프합류라인과, A pump confluence line for joining the pressurized oil of the second main hydraulic pump connected to the first control valve group among the main hydraulic pumps to the pressurized oil of the first main hydraulic pump for supplying the pressurized oil to the heel control spool;

상기 힐제어스풀을 절환시키는 힐파이롯압력을 검출하는 힐파이롯압력 검출수단과, Heel pilot pressure detecting means for detecting a heel pilot pressure for switching the heel control spool;

상기 힐파이롯압력 검출수단에서 검출한 힐파이롯압력이 소정 압력 이상인 경우에 상기 펌프합류라인을 개방하고, 힐파이롯압력이 소정압력 이하인 경우에는 상기 펌프합류라인을 차단하는 스톱밸브를 포함한다.And a stop valve which opens the pump confluence line when the heel pilot pressure detected by the heel pilot pressure detection means is equal to or greater than a predetermined pressure, and shuts off the pump confluence line when the heel pilot pressure is equal to or less than a predetermined pressure. .

또 본 발명은 상기 힐파이롯압력 검출수단에서 검출한 힐파이롯압력이 소정압력 이상인 경우에 암조이스틱밸브에서 상기 암2속 제어스풀에 전달되는 암2속파이롯신호압을 차단하는 암2속신호 차단밸브를 더 구비한다.The present invention further provides an arm second speed for cutting the arm second speed pilot signal transmitted from the joystick valve to the arm second speed control spool when the heel pilot pressure detected by the heel pilot pressure detecting means is equal to or greater than a predetermined pressure. A signal isolation valve is further provided.

그리고, 상기 힐파이롯압력 검출수단은 힐조이스틱밸브에서 생성되는 힐파일롯압력이 소정압력 이상인 경우에 전기신호를 출력하는 압력스위치이고, 상기 스톱밸브는 일측 수압부에 상기 보조펌프로부터 제공되는 파이롯라인이 연결되며, 상기 파이롯라인에는 상기 압력스위치의 전기신호에 의해 유로를 개방하는 펌프합류제어밸브가 구비된다.The heel pilot pressure detecting means is a pressure switch that outputs an electric signal when the heel pilot pressure generated by the heel joystick valve is equal to or greater than a predetermined pressure, and the stop valve is a pilot provided from the auxiliary pump in one hydraulic part. The line is connected, and the pilot line is provided with a pump confluence control valve for opening the flow path by the electrical signal of the pressure switch.

이하, 본 발명에 따른 로그 로더 굴삭기의 유압제어장치의 실시예를 첨부도면에 따라 상세히 설명한다. Hereinafter, an embodiment of a hydraulic control device of a log loader excavator according to the present invention will be described in detail according to the accompanying drawings.

도 1에는 본 발명에 따른 로그 로더 굴삭기의 유압제어장치가 도시된다. 도 1에 도시된 바와 같이, 엔진(E)에 의해 작동하는 제1,2메인유압펌프(10,20) 및 보조펌프(40)와, 상기 제1,2메인유압펌프(10)에서 각각 토출되는 압유를 흐름제어하여 힐실린더(9)나 그외 복수개의 액츄에이터에 선택적으로 공급함으로써 이들 힐실린더(9)이외에 복수개의 액츄에이터를 작동제어하는 복수개의 제어스풀(31~39)를 포함한 제어스풀그룹(30A,30B)과, 상기 보조펌프(40)의 압유를 감압시켜 상기 복수개의 제어스풀(31~39)를 제어하기 위한 파이롯신호압력을 발생시키는 다수개의 조이스틱밸브(50)를 포함하고 있다. 1 shows a hydraulic control apparatus of a log loader excavator according to the present invention. As shown in FIG. 1, the first and second main hydraulic pumps 10 and 20 and the auxiliary pump 40 operated by the engine E are discharged from the first and second main hydraulic pumps 10, respectively. A control spool group including a plurality of control spools 31 to 39 for operating and controlling a plurality of actuators in addition to the heel cylinders 9 by selectively supplying the pressure oil to be supplied to the heel cylinder 9 or a plurality of actuators. 30A, 30B and a plurality of joystick valves 50 for generating pilot signal pressures for controlling the plurality of control spools 31 to 39 by reducing the pressure of the auxiliary pump 40.

그리고 본 발명은 암실린더에 2속작동압유를 공급하는 암2속 제어스풀(34)은 상기 제1컨트롤밸브그룹(30A)에 구비되고, 힐실린더(9)에 압유를 공급하는 힐제어스풀(36)은 상기 제2컨트롤밸브그룹(30B)에 구비되며, And the present invention is provided with a second speed control spool (34) for supplying the second-speed operating pressure oil to the dark cylinder is provided in the first control valve group (30A), the heel control spool for supplying pressure oil to the heel cylinder (9) 36 is provided in the second control valve group 30B,

상기 메인유압펌프중 제1컨트롤밸브그룹(30A)에 접속된 제2메인유압펌프(20)의 압유를 상기 힐제어스풀(36)에 압유를 공급하는 제1메인유압펌프(10)의 압유에 합류시키는 펌프합류라인(41)과, The hydraulic pressure of the second main hydraulic pump 20 connected to the first control valve group 30A of the main hydraulic pump is supplied to the hydraulic oil of the first main hydraulic pump 10 for supplying the hydraulic oil to the heel control spool 36. A pump confluence line 41 for joining,

상기 힐제어스풀(36)을 절환시키는 힐파이롯압력을 검출하는 힐파이롯압력 검출수단(55)과, Heel pilot pressure detecting means (55) for detecting heel pilot pressure for switching the heel control spool (36);

상기 힐파이롯압력 검출수단(55)에서 검출한 힐파이롯압력이 소정 압력 이상인 경우에 상기 펌프합류라인(41)을 개방하고, 힐파이롯압력이 소정압력 이하인 경우에는 상기 펌프합류라인(41)을 차단하는 스톱밸브(42)와, 상기 힐파이롯압력 검출수단(55)에서 검출한 힐파이롯압력이 소정압력 이상인 경우에 암조이스틱밸브(54)에서 상기 암2속 제어스풀(34)에 전달되는 암2속 파이롯신호압(X,Y)을 차단하는 암2속신호 차단밸브(61)를 더 구비한다. The pump confluence line 41 is opened when the heel pilot pressure detected by the heel pilot pressure detecting means 55 is equal to or greater than a predetermined pressure, and the pump confluence line 41 when the heel pilot pressure is equal to or less than a predetermined pressure. Arm stop speed control spool (34) at the stop joystick valve (54) and the heel pilot pressure detected by the heel pilot pressure detecting means (55) is greater than or equal to a predetermined pressure. It is further provided with a dark second speed signal shutoff valve 61 for blocking the dark second speed pilot signal pressure (X, Y) transmitted to.

또, 상기 힐파이롯압력 검출수단(55)은 힐조이스틱밸브(53)에서 생성되는 힐파일롯압력(Pa,Pb)이 소정압력 이상인 경우에 전기신호를 출력하는 압력스위치(56)이고, 상기 스톱밸브(42)는 일측 수압부(42A)에 상기 보조펌프(40)로부터 제공되는 파이롯라인(45)이 연결되며, 상기 파이롯라인(45)에는 상기 압력스위치(56)의 전기신호에 의해 유로를 개방하는 펌프합류제어밸브(62)가 구비된다. The heel pilot pressure detecting means 55 is a pressure switch 56 for outputting an electric signal when the heel pilot pressures Pa and Pb generated by the heel joystick valve 53 are equal to or greater than a predetermined pressure. The valve 42 is connected to the pilot line 45 provided from the auxiliary pump 40 to one side hydraulic part 42A, and to the pilot line 45 by an electrical signal of the pressure switch 56. A pump confluence control valve 62 for opening the flow path is provided.

상기한 바와 같이 본 발명에 따른 굴삭기의 유압제어회로는 제어스풀그룹에 옵션장치 제어를 위하여 기존에 설치된 붐제어스풀을 사용하므로 힐실린더 제어용으로 별도의 스풀을 설치할 필요가 없어 유압회로가 간단해진다. As described above, the hydraulic control circuit of the excavator according to the present invention uses an existing boom control spool for controlling the optional device in the control spool group, so that the hydraulic circuit is simplified because there is no need to install a separate spool for the hill cylinder control.

그리고 힐실린더를 작동시키는 경우 암2속 파이롯신호는 자동으로 차단되어 암실린더가 1속으로만 제어되므로 힐실린더는 2개의 유압펌프로부터 합류된 유량을 제공받아서 2속으로 작동하게 되어 작업성능이 양호하게 된다. And when the hill cylinder is operated, the dark 2-speed pilot signal is automatically cut off, so the dark cylinder is controlled only at 1 speed, so the hill cylinder is operated at 2 speeds by receiving the flow rate from the two hydraulic pumps. It becomes good.

Claims (3)

엔진(E)에 의해 작동하는 보조펌프(40)와, 적어도 2개의 메인유압펌프(10,20)와, 상기 메인유압펌프(10,20)의 압유에 의해 작동하는 힐실린더(9)를 포함한 복수개의 액츄에이터와, 상기 각각의 메인유압펌프(10,20)로부터 압유를 공급받아 복수개의 액츄에이터로의 압유의 흐름을 제어하는 복수개의 제어스풀로 이루어진 제1,2컨트롤밸브그룹(30A,30B)과, 상기 보조펌프(40)의 압유를 감압시켜 상기 복수개의 제어스풀을 제어하는 다수개의 조이스틱밸브(50)를 구비한 로그 로더 굴삭기의 유압제어장치에 있어서, An auxiliary pump 40 operated by the engine E, at least two main hydraulic pumps 10 and 20, and a hill cylinder 9 operated by the hydraulic oil of the main hydraulic pumps 10 and 20 are included. First and second control valve groups 30A and 30B comprising a plurality of actuators and a plurality of control spools receiving pressure oil from each of the main hydraulic pumps 10 and 20 to control the flow of pressure oil to the plurality of actuators. In the hydraulic control device of a log loader excavator having a plurality of joystick valves 50 for controlling the plurality of control spools by reducing the pressure oil of the auxiliary pump 40, 암실린더에 2속작동압유를 공급하는 암2속 제어스풀(34)은 상기 제1컨트롤밸브그룹(30A)에 구비되고, 힐실린더(9)에 압유를 공급하는 힐제어스풀(36)은 상기 제2컨트롤밸브그룹(30B)에 구비되며, The arm second speed control spool 34 for supplying the second speed working pressure oil to the dark cylinder is provided in the first control valve group 30A, and the heel control spool 36 for supplying the pressure oil to the hill cylinder 9 is It is provided in the second control valve group 30B, 상기 메인유압펌프중 제1컨트롤밸브그룹(30A)에 접속된 제2메인유압펌프(20)의 압유를 상기 힐제어스풀(36)에 압유를 공급하는 제1메인유압펌프(10)의 압유에 합류시키는 펌프합류라인(41)과, The hydraulic pressure of the second main hydraulic pump 20 connected to the first control valve group 30A of the main hydraulic pump is supplied to the hydraulic oil of the first main hydraulic pump 10 for supplying the hydraulic oil to the heel control spool 36. A pump confluence line 41 for joining, 상기 힐제어스풀(36)을 절환시키는 힐파이롯압력을 검출하는 힐파이롯압력 검출수단(55)과, Heel pilot pressure detecting means (55) for detecting heel pilot pressure for switching the heel control spool (36); 상기 힐파이롯압력 검출수단(55)에서 검출한 힐파이롯압력이 소정 압력 이상인 경우에 상기 펌프합류라인(41)을 개방하고, 힐파이롯압력이 소정압력 이하인 경우에는 상기 펌프합류라인(41)을 차단하는 스톱밸브(42)를 더 구비한 것을 특징으 로 하는 로그 로더 굴삭기의 유압제어장치.The pump confluence line 41 is opened when the heel pilot pressure detected by the heel pilot pressure detecting means 55 is equal to or greater than a predetermined pressure, and the pump confluence line 41 when the heel pilot pressure is equal to or less than a predetermined pressure. Hydraulic control device for a log loader excavator, characterized in that it further comprises a stop valve (42) for blocking. 제1항에 있어서, The method of claim 1, 상기 힐파이롯압력 검출수단(55)에서 검출한 힐파이롯압력이 소정압력 이상인 경우에 암조이스틱밸브(54)에서 상기 암2속 제어스풀(34)에 전달되는 암2속파이롯신호압을 차단하는 암2속신호 차단밸브(61)를 더 구비한 것을 특징으로 하는 로그 로더 굴삭기의 유압제어장치. When the heel pilot pressure detected by the heel pilot pressure detecting means 55 is equal to or greater than a predetermined pressure, the arm second speed pilot signal pressure transmitted from the arm joystick valve 54 to the arm second speed control spool 34 is determined. Hydraulic control device for a log loader excavator, characterized in that it further comprises an arm 2 speed signal blocking valve (61) for blocking. 제1항 또는 제2항에 있어서, The method according to claim 1 or 2, 상기 힐파이롯압력 검출수단(55)은 힐조이스틱밸브(53)에서 생성되는 힐파일롯압력이 소정압력 이상인 경우에 전기신호를 출력하는 압력스위치(56)이고, 상기 스톱밸브(42)는 일측 수압부(42A)에 상기 보조펌프(40)로부터 제공되는 파이롯라인(45)이 연결되며, 상기 파이롯라인(45)에는 상기 압력스위치(56)의 전기신호에 의해 유로를 개방하는 펌프합류제어밸브(62)가 구비된 것을 특징으로 하는 로그 로더 굴삭기의 유압제어장치. The heel pilot pressure detecting means 55 is a pressure switch 56 for outputting an electric signal when the heel pilot pressure generated by the heel joystick valve 53 is greater than or equal to a predetermined pressure, and the stop valve 42 has one side hydraulic pressure. A pilot line 45 provided from the auxiliary pump 40 is connected to the unit 42A, and a pump confluence control for opening a flow path by an electrical signal of the pressure switch 56 to the pilot line 45. Hydraulic control device for a log loader excavator, characterized in that the valve 62 is provided.
KR1020050132829A 2005-12-29 2005-12-29 Hydraulic control apparatus for a log loader excavator KR101250083B1 (en)

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KR960004184Y1 (en) * 1992-05-27 1996-05-22 김연수 Oil-pressure control circuit of backhoe
KR20010064381A (en) * 1999-12-29 2001-07-09 양재신 Boom and arm multi controling hydraulic circuit for an excavator
KR20010092781A (en) * 1999-01-19 2001-10-26 세구치 류이치 Hydraulic driving device of civil engineering and construction machinery
KR20040045635A (en) * 2002-11-25 2004-06-02 대우종합기계 주식회사 Apparatus for controlling arm speed in a miniature excavator

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR960004184Y1 (en) * 1992-05-27 1996-05-22 김연수 Oil-pressure control circuit of backhoe
KR20010092781A (en) * 1999-01-19 2001-10-26 세구치 류이치 Hydraulic driving device of civil engineering and construction machinery
KR20010064381A (en) * 1999-12-29 2001-07-09 양재신 Boom and arm multi controling hydraulic circuit for an excavator
KR20040045635A (en) * 2002-11-25 2004-06-02 대우종합기계 주식회사 Apparatus for controlling arm speed in a miniature excavator

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