KR970009530B1 - System for controlling an excavator by oil pressure - Google Patents

System for controlling an excavator by oil pressure Download PDF

Info

Publication number
KR970009530B1
KR970009530B1 KR1019930029570A KR930029570A KR970009530B1 KR 970009530 B1 KR970009530 B1 KR 970009530B1 KR 1019930029570 A KR1019930029570 A KR 1019930029570A KR 930029570 A KR930029570 A KR 930029570A KR 970009530 B1 KR970009530 B1 KR 970009530B1
Authority
KR
South Korea
Prior art keywords
control valve
valve
pilot
supplied
bucket
Prior art date
Application number
KR1019930029570A
Other languages
Korean (ko)
Other versions
KR950018973A (en
Inventor
유윤상
Original Assignee
현대중장비산업 주식회사
김형벽
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 현대중장비산업 주식회사, 김형벽 filed Critical 현대중장비산업 주식회사
Priority to KR1019930029570A priority Critical patent/KR970009530B1/en
Publication of KR950018973A publication Critical patent/KR950018973A/en
Application granted granted Critical
Publication of KR970009530B1 publication Critical patent/KR970009530B1/en

Links

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
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2264—Arrangements or adaptations of elements for hydraulic drives
    • E02F9/2267—Valves or distributors
    • 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
    • E02F9/2278—Hydraulic circuits
    • E02F9/2285—Pilot-operated systems
    • 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
    • E02F9/2278—Hydraulic circuits
    • E02F9/2292—Systems with two or more pumps

Landscapes

  • 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)

Abstract

In the two main pumps and a pilot pump, the multi connected control valves(4,5), a remote control valve, the control valves are each bonded, wherein one block of the multi connected valve provides the turning control valve supply port(P1) in the nearest part of the first main pump and in the last past, the driving control valve(4 OR 5) is introduced, in the middle, control valve(4 or 5) in which an option control valve(9) where the boom up bucket control valve and the arm control valve(3), and the other end are possessed of the driving control valve(5 OR 4) in the supply port(P2) nearest part.

Description

굴삭기 유압제어 시스템Excavator Hydraulic Control System

제1도는 본 발명에 의한 굴삭기 유압제어 시스템에 관련한 메인방향제어 밸브의 유압회로도.1 is a hydraulic circuit diagram of a main direction control valve related to an excavator hydraulic control system according to the present invention.

제2도는 본 발명에 의한 굴삭기 유압제어 시스템이 관련한 파일롯트 제어 유압회로도.2 is a pilot control hydraulic circuit diagram related to the excavator hydraulic control system according to the present invention.

제3도는 본 발명에 의한 굴삭기 유압제어 시스템에 관련한 파일롯트 제어의 또 다른 적용예를 나타낸 유압회로도.3 is a hydraulic circuit diagram showing still another example of application of the pilot control related to the excavator hydraulic control system according to the present invention.

* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings

1 : 선회제어밸브 2 : 붐업버켓합류제어밸브1: Swing control valve 2: Boom up bucket confluence control valve

3 : 암제어밸브 4 : 좌 주행제어밸브3: arm control valve 4: left travel control valve

5 : 우 주행제어밸브 6 : 암합류제어밸브5: Right driving control valve 6: Female confluence control valve

7 : 붐제어밸브 8 : 버켓제어밸브7: Boom Control Valve 8: Bucket Control Valve

9 : 옵션제어밸브 13 : 선회우선밸브9: Option Control Valve 13: Swirl Priority Valve

19 : 좌측파레렐통로 14 : 암우선밸브19: left farrell passage 14: female priority valve

15 : 주행독립밸브 21 : 우측파레렐통로15: independent driving valve 21: right farrell passage

23 : 셔틀밸브 24 : 파일롯트 밸브23: shuttle valve 24: pilot valve

25 : 셔틀밸브 26 : 셔틀밸브25: shuttle valve 26: shuttle valve

본 발명은 산업 건설 중장비인 굴삭기에 있어서, 펌프로 부터 압유를 공급받아 작업장치의 유량 및 압력, 방향을 제어하는 메인 방향제어밸브의 유압제어 시스템에 관한 것이다.The present invention relates to a hydraulic control system of a main directional control valve for controlling the flow rate, pressure, and direction of the work device in the excavator, which is an industrial construction heavy equipment.

종래 굴삭기 메인방향제어 밸브의 유압제어 시스템은 각 작업장치의 복합작동시 부하가 적은쪽의 압력으로 많은 압유가 공급되므로 선회우선, 붐우선, 암우선, 주행직진등의 각 작업장치의 독립성 보장이 난이하고, 붐, 암, 버킷 작업장치의 P1, P2압유 합류시 합류 밸브의 미세제어 구간이 짧아 합류 미터링 특성이 좋지 않은 결점이 있다.In the conventional hydraulic control system of the main direction control valve of the excavator, a large amount of hydraulic oil is supplied at the pressure of the less load when the combined operation of each working device ensures the independence of each working device such as the turning priority, the boom priority, the dark priority, and the driving straight. It is difficult and has a disadvantage in that the confluence metering characteristics are not good because the fine control section of the confluence valve is short when the boom, arm, and bucket work equipments merge P1 and P2 pressure oils.

본 발명은 상기한 종래 메인방향 제어밸브의 유압시스템제어의 문제점에서 지적된 선회 및 붐, 암, 버켓, 주행작업 등의 복합 작동시 주행작업이 타작업과의 관계없이 압력과 압유가 독립적으로 공급되며 선회작업장치가 붐, 암, 버켓 합류시 메인방향제어밸브의 스푸울에 의한 합류로 미터링특성을 좋게한 것이다.The present invention provides the independent supply of pressure and pressure oil regardless of the other operation of the operation of the turning and boom, arm, bucket, traveling operation, etc. pointed out in the above problems of the hydraulic system control of the conventional main direction control valve When the swivel working device joins the boom, arm and bucket, the metering characteristics are improved by the joining by the sprue of the main directional control valve.

상기 목적을 달성하기 위한 본 발명은 제1도 및 2도에 도시된 바와 같이 메인방향 제어밸브의 좌측 전방부에 P1포트를 설치하여 압유공급을 유도하고, P1포트의 가장 근접위치에 선회제어밸브 1를 설치하며, 다음에 붐업버켓합류제어밸브 2 및 암제어밸브 3, 좌 주행제어밸브 4를 설치하고, 메인방향제어밸브의 우측 후방부에 P2포트를 설치하여 압유공급을 유도하고, P2포트의 가장 근접위치에 우 주행제어밸브 5를 설치하며, 다음에 암합류제어밸브 6 및 붐제어밸브 7, 버켓제어밸브 8, 옴션제어밸브 9를 설치하고 선회제어밸브 1에서 다음 제어밸브로 연결되는 좌측파레럴통로 19에 선회제어 밸브 13를 설치하며 좌 주행제어밸브 4로 연결되는 좌측파레럴통로 19와 우 주행제어밸브 5에서 다음 제어밸브로 연결되는 우측파레럴통로 21를 주행독립 밸브 15설치 상호연결폐쇄하고, 버켓제어밸브 8로 연결되는 우측파레럴 통로 21에 암우선밸브 14를 설치하며, 리모트 콘트롤 밸브의 BK의 PbkL파일롯트 신호암과 Pbks파일롯트 신호암을 받는 셔틀밸브 23를 설치하고 파일롯트 신호압을 PbmL신호압에 의해 제어하는 파일롯트밸브 24를 설치, Pbkz파일롯트 포트로 연결 폐쇄하게 하며, AM의 Pams파일롯트 통로와 PamL파일롯트 통로 연결부에 셔틀밸브 25를 설치하여, 선회 작업시는 SW의 셔틀밸브 26에 의해 PSW로 파일롯트 신호압이 유도되어 선회우선밸브 13는 좌측 파레럴 통로 19의 유로를 제어하여 붐, 버켓, 암 등의 연동 작업시 붐압 버켓함류 제어밸브 2 및 암제어밸브 3로 가는 유량이 선회제어밸브 1로 공급되는 유량보다 상대적으로 적게하여 스윙우선이 되게한 것이다.The present invention for achieving the above object is to install the P1 port in the left front of the main directional control valve as shown in Figs. 1 and 2 to induce pressure supply, and to turn the control valve to the nearest position of the P1 port 1, then boom up bucket confluence control valve 2, arm control valve 3, left travel control valve 4 is installed, P2 port is installed on the right rear side of the main directional control valve to induce pressure supply, and P2 port The driving control valve 5 is installed at the closest position of the next, and then the female confluence control valve 6 and the boom control valve 7, the bucket control valve 8, and the osmosis control valve 9 are installed and connected from the turning control valve 1 to the next control valve. Install the turning control valve 13 on the left parallel passage 19 and install the independent driving valve 15 on the left parallel passage 19 connected to the left driving control valve 4 and the right parallel passage 21 connecting to the next control valve from the right traveling control valve 5.Close the interconnection, install the female priority valve 14 in the right parallel passage 21 to the bucket control valve 8, and install the shuttle valve 23 receiving the PbkL pilot signal arm and Pbks pilot signal arm of the BK of the remote control valve. Install pilot valve 24 to control the lot signal pressure by PbmL signal pressure and connect to Pbkz pilot port. The pilot signal pressure is guided to the PSW by the shuttle valve 26 of the SW, and the turning priority valve 13 controls the flow path of the left parallel passage 19 to control the boom pressure bucket holding control valve 2 and The flow rate to the arm control valve 3 is relatively lower than the flow rate supplied to the swing control valve 1 to become the swing priority.

이와 같이 된 본 발명의 주행독립기능은 주행단독작업시에는 P1포트로 공급된 압유는 좌 주행제어밸브 4로 공급되고 P2포트로 공급된 압유는 우 주행제어밸브 5로 공급되어 각각의 펌프로 부터 압유가 공급되지만 타 작업장치와의 연동작업시는 타 작업장치가 제어밸브 작동됨과 동시에 주행독립밸브 파일롯트 통로 20를 차단함으로서 PT파일롯트 통로의 신호압은 상승되어 주행독립밸브 15를 제어하여 좌 주행밸브 4와 우 주행제어밸브 5로 압유공급은 P2포트의 제2펌프로만 공급되고, 타 작업장치의 압유공급은 P1포트의 제1펌프로만 공급되므로 주행작업장치와 타 작업장치는 각각 독립되게 작동되므로 주행독립기능이 가능하다.In the independent driving function of the present invention, the oil pressure supplied to the P1 port is supplied to the left travel control valve 4 and the oil pressure supplied to the P2 port is supplied to the right travel control valve 5 at the time of driving alone. While the hydraulic oil is supplied, when the other work device is interlocked, the other work device operates the control valve and blocks the driving independent valve pilot passage 20 so that the signal pressure of the PT pilot passage increases, controlling the driving independent valve 15 to the left. The oil pressure supply is supplied only to the second pump of P2 port and the oil pressure supply of the other work device is supplied only to the first pump of P1 port by the traveling valve 4 and the right driving control valve 5. Independent operation is possible because of the operation.

암 및 붐업, 버켓 단독작업시는 각각의 독립된 제어밸브에 의해서 제1펌프 및 제2펌프의 압유가 공급되므로 미터링제어 및 각 작업장치에서 요구되는 충분한 유량의 공급이 가능하다.When the arm, boom up, and bucket work alone, the oil pressure of the first pump and the second pump is supplied by the independent control valves, so that the metering control and the sufficient flow rate required for each work device can be provided.

암 및 버켓 연동작업시는 BK 및 AM리모트 콘트롤 밸브의 작동에 의해 P1포트의 제1펌프공급압유는 붐업버켓 합류제어밸브 2 및 압제어밸브 3로 공급되고, P2포트의 제2펌프공급 압유는 압합류제어밸브 6 및 버켓제어밸브 8로 공급되고, 붐업버켓합류제어밸브 2로 공급된 압유는 버켓합류통로 22를 통해 버켓제어밸브 8로 공급된다.During arm and bucket interlocking operation, the first pump supply pressure oil of the P1 port is supplied to the boom-up bucket confluence control valve 2 and the pressure control valve 3 by the operation of the BK and AM remote control valves, and the second pump supply pressure oil of the P2 port is The pressure oil supplied to the pressure confluence control valve 6 and the bucket control valve 8 and the boom-up bucket confluence control valve 2 is supplied to the bucket control valve 8 through the bucket confluence passage 22.

AM의 셔틀밸트 25를 통해 Pam파일롯트포트로 유도된 파일롯트압에 의해 암우선밸브 14는 우측 파레럴 통로 21로 통해 버켓제어밸브 8로 공급되는 유량을 제어하여 상대적으로 암합류제어밸브 6로 공급되는 유량이 충분하도록 하여 암우선 기능이 가능하다.Due to the pilot pressure induced in the Pam pilot port through the shuttle belt 25 of the AM, the female priority valve 14 controls the flow rate to the bucket control valve 8 through the right parallel passage 21 to the relatively A dark priority function is possible by supplying sufficient flow rate.

붐다운, 버켓 연동작업시는 붐작업장치에 많은 유량이 필요치 않으므로 P1포트의 제1펌프공급 압유는 붐업버켓합류제어밸브 2를 통해 버켓제어밸브 8로 공급되고, P2포트의 제2펌프공급 압유는 붐제어밸브 7 및 버켓제어밸브 8로 유량이 분배되므로 버켓유량 합류 및 붐다운유량제어의 기능이 가능하다. 붐업, 버켓연동 작업시는 붐작업장치에 많은 유량이 필요하므로 BK의 PbmL파일롯트 신호압은 파일롯트밸브 24를 제어하여 Pbkz파일롯트 포트로 통하는 파일롯트 압을 폐쇄, P1포트의 제1펌프공급압유는 붐업버켓합류제어밸브 2를 통해 붐작업장치 실린더의 리치챔버포트(BMLZ)로 공급되고, P2포트의 제2펌프공급압유는 붐제어밸브 7 및 버켓제어밸브 8로 유량이 분배되므로 붐우선 유량제어기능이 가능하다.Since the boom work device does not require much flow during boom down and bucket interlocking operation, the first pump supply pressure oil of P1 port is supplied to bucket control valve 8 through boom-up bucket confluence control valve 2 and the second pump supply pressure oil of P2 port Since the flow is distributed to the boom control valve 7 and the bucket control valve 8, the bucket flow confluence and the boom down flow control is possible. Boom PBmL pilot signal pressure controls pilot valve 24 to close the pilot pressure to Pbkz pilot port by supplying the first pump of P1 port. The hydraulic oil is supplied to the rich chamber port (BMLZ) of the boom working cylinder through the boom-up bucket confluence control valve 2, and the second pump supply pressure oil of the P2 port is distributed to the boom control valve 7 and the bucket control valve 8, Flow control function is possible.

상기 구성과 작용에 의한 본 발명의 효과는 선회우선기능에 의해 굴삭기 덤프 상차 작업시, 암 또는 버켓 붐 작업시 선회속도의 저하없이 복합작업이 가능하며, 붐 버켓 압합류가 각 제어밸브의 스프울 작동에 의한 미세제어 작동이 가능하므로 합류시의 쇼크현상이 없이 각 작업장치의 작업속도 향상이 가능하며, 주행작업과 타작업장치의 연동작업을 하는 크레인 작업 등을 할 때 주행작업과 타작업장치가 독립적으로 작동하므로 상호간섭없이 안정되게 작업을 할 수 있어 작업성 및 안정성, 조직성이 향상되어 굴삭기 전체 기기의 품질과 기능이 향상되는 것이다.The effect of the present invention by the above configuration and action is possible to combine the operation of the excavator dump loading operation, the arm or the bucket boom operation without deterioration of the rotational speed by the turning priority function, the boom bucket confluence flow spring of each control valve It is possible to fine control operation by operation, so that the working speed of each work device can be improved without shock phenomenon when joining, and the work work and other work device when carrying out work work and crane work that interlocks other work devices. It works independently, so that it can work stably without mutual interference, which improves workability, stability and organization, thereby improving the quality and function of the entire equipment of the excavator.

Claims (5)

건설 기계중장비인 굴삭기의 유압작업장치를 제어하는 유압시스템 제어부에서 2개의 메인펌프와 1개의 파일롯트 펌프에 각각 다연 제어밸브 4연, 5연 및 리모트 콘트롤 밸브, 제어밸브를 연결하여, 다연 제어밸브의 한쪽블록은 제1메인펌프 공급 포트 P1최근접부에 선회제어밸브 1를 설치하고 최종부에 주행제어밸브(4 OR 5)를 설치하며 중간에 붐업버켓합류제어밸브 2 및 암제어밸브 3를 설치한 4연 및 옵션제어밸브 9가 설치된 5연 제어밸브로 구성되고, 다른한쪽 블록은 제2메인펌프 공급포트 P2최근접부에 주행제어밸브(5 OR 4)를 설치하며 암합류제어밸브 6 및 붐제어밸브 7 다음에 버켓제어밸브 8를 설치한 4연 또는 옵션제어밸브 9가 설치된 5연 제어밸브로 구성되며, 선회제어밸브 1와 다음제어밸브와의 중간 좌측파레럴 통로 19에 선회우선밸브 13를 설치 유량을 가변제어하고, 최종부의 좌 주행제어밸브 4로 연결되는 좌측파레럴통로 19와, 우 주행제어밸브 5와 다음 제어밸브와의 중간 우측 파레럴통로 21를 주행독립밸브 15를 설치 상호연결 폐쇄하여, 버켓제어밸브 8로 연결되는 우측파레럴통로 21에 암우선밸브 15설치 유량을 가변제어하는 것을 특징으로 하는 굴삭기 유압제어 시스템In the hydraulic system control unit that controls the hydraulic work device of the construction machinery heavy equipment, the multiple control valves are connected to two main pumps and one pilot pump by connecting four, five and remote control valves and control valves, respectively. Of the main block supply port P1, turn control valve 1 is installed in the closest part, travel control valve (4 OR 5) is installed in the last part, and boom up bucket confluence control valve 2 and arm control valve 3 are installed in the middle. It consists of a four-stage and five-stage control valve with an optional control valve 9, and the other block installs a travel control valve (5 OR 4) in the closest part of the second main pump supply port P2. Control valve 7 consists of a four-stage control valve with a bucket control valve 8 or a five-stage control valve with an optional control valve 9, and the pivot priority valve 13 in the middle left parallel passage 19 between the swing control valve 1 and the next control valve. Install Variable flow rate control, left independent parallel passage 19 connected to the left traveling control valve 4 at the end, and the right independent parallel passage 21 between the right traveling control valve 5 and the next control valve. Excavator hydraulic control system, characterized in that for controlling the flow rate of the installation of the female priority valve 15 in the right parallel passage 21 connected to the bucket control valve 8 제1항에 있어서, 붐업버켓합류제어밸브 2는 붐업단독작업 또는 버켓작업 이외의 타 작업장치와의 복합 작업시 리모트 콘트롤밸브의 파일롯트 포트(PbmL)의 파일롯트압에 의해 P1포트의 제1펌프압유가 붐업버켓 합류제어밸브 2를 통해 붐작업장치로 공급되고, 붐업작업이와의 버켓단독작업 또는 타작업장치와의 복합 작업시 파일롯트 포트(Pbk2)의 파일롯트 압에 의해 P1포트의 제1펌프암유가 붐업버켓합류제어밸브 2를 통해 버켓제어밸브 8로 공급되며, 붐업작업 및 버켓동시작업시 파일롯트 밸브 24를 제어하여 파일롯트 포트(Pbk2)의 파일롯트 압을 폐쇄하여 붐업버켓합류제어 밸브 2로 공급된 압유는 붐작업장치로 공급되는 것을 특징으로 하는 굴삭기 유압제어 시스템The boom-up bucket confluence control valve 2 according to claim 1, wherein the boom-up bucket confluence control valve 2 is operated by the pilot pressure of the pilot port (PbmL) of the remote control valve when the boom-up operation alone or in combination with another work device other than the bucket operation. The pump pressure oil is supplied to the boom work device through the boom-up bucket confluence control valve 2, and the pilot pressure of the pilot port (Pbk2) 1 Pump oil is supplied to the bucket control valve 8 through the boom-up bucket confluence control valve 2, and the pilot pressure of the pilot port (Pbk2) is closed by controlling the pilot valve 24 during the boom-up and bucket simultaneous operation. Hydraulic pressure control system for excavators, characterized in that the hydraulic pressure supplied to the control valve 2 is supplied to the boom working device 제1항에 있어서, 주행독립밸브 15는 좌 주행제어밸브 4 및 우 주행제어밸브 5의 단독작동 및 복합작동시 P1포트로 공급된 제1펌프 압유는 좌측파레럴 통로 19 및 주행독립밸브 15를 통해 좌 주행제어밸브 4로 공급되고 P2포트로 공급된 제2펌프 압유는 우측파레럴 통로 21 및 주행독립 밸브 15를 통해 우 주행제어밸브 5로 공급되며, 좌 주행제어밸브 4 또는 우 주행제어밸브 5와 기타 타작업장치와의 복합동작시는 파일롯트 포트(Pt)의 파일롯트 압에 의해 주행독립밸브 15는 P1포트의 제1펌프압유는 기타 타작업장치로 공급되고, P2포트의 제2펌프압유는 좌 주행제어밸브 4 및 우 주행제어밸브 5로 공급되게 하는 것을 특징으로 하는 굴삭기 유압제어 시스템The driving independent valve 15 of claim 1, wherein the first pump pressure oil supplied to the P1 port in the single operation and the combined operation of the left driving control valve 4 and the right driving control valve 5 is connected to the left parallel passage 19 and the driving independent valve 15. The second pump pressure oil supplied to the left driving control valve 4 through the P2 port is supplied to the right driving control valve 5 through the right parallel passage 21 and the driving independent valve 15, and the left traveling control valve 4 or the right traveling control valve In the combined operation of 5 and other work tools, the pilot independent pressure of the pilot port (Pt) is used to drive the independent valve 15, and the first pump pressure oil of the P1 port is supplied to the other work equipment, and the second of the P2 port. Excavator hydraulic control system, characterized in that the pump pressure oil is supplied to the left driving control valve 4 and the right driving control valve 5 제1항에 있어서, 암우선밸브 14는 암작업장치 작동이외는 우측파레럴 통로 21로 공급된 압유가 버켓제어밸브 8로 전부공급되고, 암작업장치 작동시는 셔틀밸브 25를 통해 파일롯트 포트(Pam)에 파일롯트 압이 공급되어 우측파레럴통로 21로 공급된 압유가 버켓제어밸브 8로 공급되는 유량을 제어하는 것을 특징으로 하는 굴삭기 유압제어 시스템According to claim 1, wherein the female priority valve 14 is supplied to the bucket control valve 8 all the hydraulic oil supplied to the right parallel passage 21 except for the operation of the arm work device, the pilot port through the shuttle valve 25 during operation of the female work device Excavator hydraulic control system characterized in that the pilot pressure is supplied to (Pam) to control the flow rate of the pressure oil supplied to the right parallel passage 21 to the bucket control valve 8 제1항에 있어서, 암우선밸브 14는 암작업장치 작동을 붐업작동을 하지않고 작동할시는 셔틀밸브 25를 통해 파일롯트 포트(Pam)에 파일롯트압이 공급되어 우측파레럴통로 21로 공급된 압유가 버켓제어밸브 8로 공급되는 유량을 제어하고, 붐업작동과 암작업장치 작동을 복합작동시에는 파일롯트 밸브 27에 리모트 콘트롤 BM의 PbmL파일롯트 압이 작용하여 파일롯트 포트(Pam)에 공급되는 파일롯트 압이 차단된 것을 특징으로 하는 굴삭기 유압제어 시스템The pilot valve 14 of claim 1, wherein the pilot valve 14 is supplied with a pilot pressure to the pilot port Pam through the shuttle valve 25 when the arm work device is operated without the boom-up operation. When the pressurized oil is supplied to the bucket control valve 8 to control the flow rate, and the boom up operation and the arm work operation are combined, the pilot pressure of the PbmL pilot of the remote control BM acts on the pilot valve 27 to the pilot port (Pam). Excavator hydraulic control system, characterized in that the pilot pressure supplied is cut off
KR1019930029570A 1993-12-24 1993-12-24 System for controlling an excavator by oil pressure KR970009530B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019930029570A KR970009530B1 (en) 1993-12-24 1993-12-24 System for controlling an excavator by oil pressure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019930029570A KR970009530B1 (en) 1993-12-24 1993-12-24 System for controlling an excavator by oil pressure

Publications (2)

Publication Number Publication Date
KR950018973A KR950018973A (en) 1995-07-22
KR970009530B1 true KR970009530B1 (en) 1997-06-14

Family

ID=66853892

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1019930029570A KR970009530B1 (en) 1993-12-24 1993-12-24 System for controlling an excavator by oil pressure

Country Status (1)

Country Link
KR (1) KR970009530B1 (en)

Also Published As

Publication number Publication date
KR950018973A (en) 1995-07-22

Similar Documents

Publication Publication Date Title
US6164069A (en) Hydraulic drive system for construction machine
KR101155717B1 (en) Apparatus for controlling the boom-swing combined motion of an excavator
KR101754290B1 (en) Hydraulic drive system for construction machine
JP5669448B2 (en) Hydraulic drive system for excavator
KR100665113B1 (en) Haydraulic circuit for heavy equipment
CN109563695B (en) Control valve for excavator and excavator
KR20030008069A (en) Hydraulic apparatus for controlling complex work mode of travel and front works
KR970009530B1 (en) System for controlling an excavator by oil pressure
KR20070069876A (en) Hydraulic control system for combined operation of en excavator
KR20200071124A (en) Fluid pressure control device
KR20080051212A (en) Hydraulic system for small-sized excavator to improve bucket speed
JP2001040713A (en) Construction machine with crane function
KR102500484B1 (en) directional seated valve
KR20070069849A (en) Hydraulic control system for a travel-combined-operation of en excavator
KR200257578Y1 (en) A flow rate controlling apparatus for operating boom of an excavator
KR100307327B1 (en) Confluent device of hydraulic construction equipment with hydraulic pumps
KR20040045635A (en) Apparatus for controlling arm speed in a miniature excavator
KR100198158B1 (en) Actuator working hydraulic system of heavy equipment
EP0279362B1 (en) Hydraulic system
JP3119293B2 (en) Hydraulic circuit of work machine
JPH09165791A (en) Hydraulic circuit for working machine
KR100565542B1 (en) Hydraulic circuit of wheel type excavator with independent driving function
KR100188885B1 (en) Straight driving apparatus for heavy equipment
EP3686440A1 (en) Fluid pressure control device
JP2001039672A (en) Construction machinery with crane function

Legal Events

Date Code Title Description
A201 Request for examination
G160 Decision to publish patent application
E701 Decision to grant or registration of patent right
GRNT Written decision to grant
FPAY Annual fee payment

Payment date: 20041210

Year of fee payment: 9

LAPS Lapse due to unpaid annual fee