KR20030008070A - Boom down control apparatus for a hydraulic heavy equipments - Google Patents

Boom down control apparatus for a hydraulic heavy equipments Download PDF

Info

Publication number
KR20030008070A
KR20030008070A KR1020010042825A KR20010042825A KR20030008070A KR 20030008070 A KR20030008070 A KR 20030008070A KR 1020010042825 A KR1020010042825 A KR 1020010042825A KR 20010042825 A KR20010042825 A KR 20010042825A KR 20030008070 A KR20030008070 A KR 20030008070A
Authority
KR
South Korea
Prior art keywords
boom
valve
hydraulic
maximum
control
Prior art date
Application number
KR1020010042825A
Other languages
Korean (ko)
Other versions
KR100795612B1 (en
Inventor
김성일
Original Assignee
대우종합기계 주식회사
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 대우종합기계 주식회사 filed Critical 대우종합기계 주식회사
Priority to KR1020010042825A priority Critical patent/KR100795612B1/en
Publication of KR20030008070A publication Critical patent/KR20030008070A/en
Application granted granted Critical
Publication of KR100795612B1 publication Critical patent/KR100795612B1/en

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
    • E02F3/36—Component parts
    • E02F3/42—Drives for dippers, buckets, dipper-arms or bucket-arms
    • E02F3/43—Control of dipper or bucket position; Control of sequence of drive operations
    • E02F3/435—Control of dipper or bucket position; Control of sequence of drive operations for dipper-arms, backhoes or the like
    • 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
    • E02F9/2278—Hydraulic circuits
    • E02F9/2285—Pilot-operated systems

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Operation Control Of Excavators (AREA)

Abstract

PURPOSE: Provided is a boom declination control apparatus useable in a hydraulic heavy equipment to inhibit the boom from declining below a determined level when the boom with heavy load is rapidly operated, thereby to prevent the equipment from being overturned and/or breakdown of attachments on front end of the equipment. CONSTITUTION: The control apparatus comprises in general a main pump(1), a boom control spool(3) and a joystick valve(5) to change directions of the boom control spool(3). The control apparatus further includes a detection component to sense maximum declination of the boom; both hydraulic portions(3a,3b) of the spool(3); and a cutoff valve(11) mounted on a pilot line(10) to pass/block the pilot signal pressure for controlling the declination of the boom by means of detected signals from the detection component.

Description

유압중장비의 붐하강제어장치{ Boom down control apparatus for a hydraulic heavy equipments}Boom down control apparatus for a hydraulic heavy equipments}

본 발명은 굴삭기와 같은 유압중장비의 붐하강 제어장치에 관한 것으로, 특히 무거운 하중을 지지한 붐을 급속조작할 때 붐이 설정치 이하로 하강하지 않도록 하여 차량전복을 방지하거나 또는 선단에 부착된 어태치먼트의 파손을 방지하기 위한 붐하강 제어장치에 관한 것이다.The present invention relates to a boom lowering control device of a hydraulic heavy equipment such as an excavator, in particular, when the boom supporting a heavy load is rapidly operated to prevent the boom from lowering below the set value to prevent vehicle overturning or attachment of the attachment attached to the tip It relates to a boom lowering control device for preventing damage.

굴삭기와 같은 통상의 유압중장비는 붐의 최대하강위치를 규제하는 장치를 구비하고 있지 않다. 이러한 유압중장비에서 무거운 하중체를 운반하는 등 붐에 큰 부하가 걸리는 작업의 경우에 붐을 급격하게 하강시키게 되면 그 붐을 포함한 프론트부분의 관성에 의해 차량, 특히 경사진 언덕에서 작업하는 차량은 전복되거나 붐 선단에 설치된 어태치먼트가 지면에 닿아 파손되는 경우가 종종 있었다.Conventional hydraulic heavy equipment such as excavators do not have a device for regulating the maximum lowered position of the boom. In the case of a heavy load such as carrying heavy loads in such hydraulic heavy equipment, when the boom is lowered sharply, the vehicle, especially a vehicle working on an inclined hill, is rolled over by the inertia of the front part including the boom. Attachments attached to the boom tip are often damaged by touching the ground.

이에 본 발명은 상기 종래의 유압중장비가 가진 문제점을 해결하기 위하여 고안된 것으로, 붐을 급격히 하강조작하더라도 붐이 설정치 이하로는 하강하지 않도록 제어하여 차량의 전복 또는 어태치먼트의 파손등을 방지하는 붐하강 제어장치를 제공함에 목적이 있다.Accordingly, the present invention is designed to solve the problems of the conventional hydraulic heavy equipment, boom lowering control to control the boom does not lower below the set value even if the boom is lowered operation to prevent the vehicle overturn or damage of attachments, etc. It is an object to provide a device.

도 1은 본 발명의 구성을 개략적으로 도시한 회로도이다.1 is a circuit diagram schematically showing the configuration of the present invention.

도 2는 센터프레임과 붐의 연결부위에 설치된 근접스위치를 도시하기 위하여 도 1의 'A-A'방향에서 부분확대도시한 개략도이다.FIG. 2 is a schematic diagram partially enlarged in the direction 'A-A' of FIG. 1 to show a proximity switch installed at a connection portion between a center frame and a boom.

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

1: 메인펌프 2: 붐실린더1: main pump 2: boom cylinder

3: 붐제어스풀 3a,3b: 수압부3: boom control spool 3a, 3b: hydraulic part

4: 보조펌프 5: 조이스틱밸브4: auxiliary pump 5: joystick valve

10: 붐하강 파이롯라인 11: 컷오프밸브10: Boom Lower Pilot Line 11: Cut-Off Valve

11a: 수압부 12: 붐11a: hydraulic part 12: boom

13: 센터프레임 14: 근접스위치13: center frame 14: proximity switch

14a: 제2근접스위치 15: 릴레이스위치14a: second proximity switch 15: relay switch

16: 선택스위치16: selector switch

상기 목적을 달성하기 위한 본 발명은 메인펌프와, 메인펌프에서 토출되는 압유의 방향을 제어하여 붐실린더로 압유를 공급 또는 차단하는 콘트롤밸브의 붐제어스풀과, 보조펌프에서 토출되는 압유를 감압하여 파이롯신호압을 생성하고, 이 파이롯신호압을 상기 붐제어스풀의 좌우양측 수압부에 선택적으로 작용시켜 상기붐제어스풀을 작동위치로 방향절환시키는 조이스틱밸브를 포함한 유압중장비의 붐하강 제어장치에 있어서,The present invention for achieving the above object is to reduce the pressure of the main pump, the boom control spool of the control valve for supplying or blocking the pressure oil to the boom cylinder by controlling the direction of the pressure oil discharged from the main pump, the pressure oil discharged from the auxiliary pump Boom lowering control device for hydraulic heavy equipment including a joystick valve for generating a pilot signal pressure and selectively operating the pilot signal pressure on the left and right hydraulic parts of the boom control spool to redirect the boom control spool to an operating position. To

상기 조이스틱밸브의 붐제어용 파이롯신호압을 콘트롤밸브의 붐제어스풀에 전달하는 붐하강 파이롯라인상에 설치되고, 상기 붐제어용 파이롯신호압을 붐제어스풀에 전달하여 붐제어스풀을 작동위치로 절환시키거나 상기 붐제어용 파이롯신호압을 탱크로 드레인시키는 컷오프밸브와, 붐이 최대하강위치까지 하강하였을 때 이를 감지하여 신호를 송출하는 붐 최대하강 감지수단을 포함하고, 상기 컷오프밸브는 상기 붐 최대하강 감지수단의 감지신호에 의하여 붐제어용 파이롯신호압을 탱크로 드레인시켜 붐하강을 정지시키도록 구성된 것에 특징이 있다.It is installed on the boom descending pilot line for transmitting the boom control pilot signal pressure of the joystick valve to the boom control spool of the control valve, and transfers the boom control pilot signal pressure to the boom control spool to operate the boom control spool. And a cutoff valve for switching to or draining the pilot signal pressure for boom control to a tank, and a boom maximum fall detection means for detecting a signal when the boom is lowered to a maximum lowered position and transmitting a signal. The boom control pilot signal pressure is drained into the tank by the detection signal of the boom maximum downward detection means, characterized in that configured to stop the boom lowering.

한편, 상기 붐 최대하강 감지수단은 붐이 최대하강 위치로 하강하였을 때 이를 감지하여 전기적 신호를 송출하는 근접스위치로 구성되고, 상기 컷오프밸브는 솔레노이드밸브로 구성되어 상기 근접스위치에서의 붐 최대하강 감지신호가 상기 컷오프밸브의 솔레노이드부에 인가되게 구성되게 한 것에 특징이 있다.On the other hand, the boom maximum downward detection means is configured as a proximity switch for transmitting an electrical signal by detecting this when the boom is lowered to the maximum downward position, the cut-off valve is composed of a solenoid valve to detect the maximum boom in the proximity switch Characterized in that the signal is configured to be applied to the solenoid portion of the cutoff valve.

이하, 본 발명에 따른 유압중장비의 붐 하강제어장치의 실시예를 첨부도면에 따라 상세히 설명한다.Hereinafter, an embodiment of the boom lowering control apparatus of the hydraulic heavy equipment according to the present invention will be described in detail according to the accompanying drawings.

도 1에 도시된 바와 같이, 본 발명에 따른 유압중장비의 붐 하강제어장치는 메인펌프(1)와, 메인펌프(1)에서 토출되는 압유의 방향을 제어하여 붐실린더(2)로 압유를 공급 또는 차단하는 콘트롤밸브의 붐제어스풀(3)과, 보조펌프(4)에서 토출되는 압유를 감압하여 파이롯신호압을 생성하고, 이 파이롯신호압을 상기 붐제어스풀(3)의 좌우양측 수압부(3a,3b)에 선택적으로 작용시켜 상기 붐제어스풀(3)을 방향절환시키는 조이스틱밸브(5)를 포함한다.As shown in FIG. 1, the boom lowering control apparatus of the hydraulic heavy equipment according to the present invention controls the direction of the main pump 1 and the pressure oil discharged from the main pump 1 to supply the pressure oil to the boom cylinder 2. Alternatively, the pilot signal pressure is generated by reducing the boom control spool 3 of the control valve and the pressure oil discharged from the auxiliary pump 4, and the pilot signal pressure is generated by the left and right sides of the boom control spool 3; And a joystick valve 5 which selectively acts on the hydraulic pressure parts 3a and 3b to redirect the boom control spool 3.

또한 본 발명의 붐 하강제어장치는 붐(12)이 최대하강위치까지 하강하였을 때 이를 감지하여 신호를 발생시키는 붐 최대하강 감지수단을 포함한다. 붐 최대하강 감지수단은 붐(12)을 회동가능하게 지지한 센터프레임(13)상에 설치되어 최대하강위치까지 회동한 붐을 감지하는 근접스위치(14)로 구성된다.In addition, the boom lowering control apparatus of the present invention includes a boom maximum falling detection means for generating a signal by detecting when the boom 12 is lowered to the maximum lowered position. The boom maximum downward detection means is constituted by a proximity switch 14 installed on the center frame 13 rotatably supporting the boom 12 so as to sense the boom rotated up to the maximum downward position.

그리고 본 발명에 따른 유압중장비의 붐 하강제어장치는 상기 조이스틱밸브(5)의 붐하강제어용 파이롯신호압을 콘트롤밸브의 붐제어스풀(3)의 수압부(3a)에 전달하는 붐하강 파이롯라인(10)상에 설치되어 상기 붐최대하강 감지수단의 감지신호에 의해 붐하강제어용 파이롯신호압을 통과시키거나 차단시키는 컷오프밸브(11)를 포함한다.And the boom lowering control device of the hydraulic heavy equipment according to the present invention is a boom lowering pilot for transmitting the pilot signal pressure for the boom lowering control of the joystick valve (5) to the hydraulic pressure section (3a) of the boom control spool (3) of the control valve It is provided on the line 10 includes a cutoff valve 11 for passing or blocking the pilot signal pressure for boom lowering control by the detection signal of the boom maximum downward detection means.

상기 컷오프밸브(11)는 솔레노이드밸브로 구성되고, 컷오프밸브(11)의 솔레노이드부(11a)에는 상기 붐최대하강을 감지하는 근접스위치(14)가 릴레이스위치(15)를 통하여 전기적으로 연결된다. 그리고 상기 릴레이스위치(15)와 컷오프밸브(11)사이에는 선택스위치(16)가 개재되어 상기 컷오프밸브(11)의 작동을 선택할 수 있게 되어 있다.The cutoff valve 11 is composed of a solenoid valve, and the proximity switch 14 for detecting the maximum boom drop is electrically connected to the solenoid portion 11a of the cutoff valve 11 through the relay switch 15. A selection switch 16 is interposed between the relay switch 15 and the cutoff valve 11 to select an operation of the cutoff valve 11.

한편, 본 발명에 따른 붐하강 제어장치의 다른 실시예는 도 2에 도시된 바와 같이, 붐(12)이 최대하강위치에 도달하기 전에 붐(12)의 위치를 감지하는 제2근접스위치(14a)를 센터프레임(13)상에 추가로 설치하고, 상기 제2근접스위치(14a)에 의해 신호가 검출될 때 상기 컷오프밸브(11)를 일부만 차단되게 구성한 것이다.On the other hand, another embodiment of the boom lowering control device according to the present invention, as shown in Figure 2, the second proximity switch 14a for detecting the position of the boom 12 before the boom 12 reaches the maximum lowered position ) Is additionally installed on the center frame 13, and the cutoff valve 11 is partially cut off when a signal is detected by the second proximity switch 14a.

이하, 상기한 바와 같이 구성된 본 발명의 작동을 단계별로 설명한다.Hereinafter, the operation of the present invention configured as described above will be described step by step.

붐이 최대하강위치 이내에서 작동할 때When the boom is operating within the maximum lowered position

이 경우 붐 최대하강위치 감지수단인 근접스위치(14)는 작동하지 않으므로 상기 컷오프밸브(11)의 솔레노이드부(11a)에는 전기가 인가되지 않아 항상 유로를 붐제어스풀(3)쪽으로 개방한다. 여기서 붐을 하강시키기 위하여 조이스틱밸브(5)를 조작하여 붐하강제어용 파이롯신호압을 발생시키면 이 붐하강제어용 파이롯신호압력은 컷오프밸브(11)를 거쳐 붐제어스풀의 한쪽 수압부에 작용한다. 이에 따라 붐제어스풀은 메인유압펌프의 압유를 붐실린더의 하강측 챔버로 공급하여 붐은 하강하게 된다.In this case, since the proximity switch 14, which is the boom maximum lowering position sensing means, does not operate, electricity is not applied to the solenoid portion 11a of the cutoff valve 11, so that the flow path is always opened toward the boom control spool 3. When the pilot signal pressure for boom lowering control is generated by operating the joystick valve 5 to lower the boom, the pilot signal pressure for boom lowering control acts on one hydraulic part of the boom control spool via the cutoff valve 11. . Accordingly, the boom control spool supplies the pressure oil of the main hydraulic pump to the lower chamber of the boom cylinder, and the boom is lowered.

붐을 급격히 최대하강위치 이하로 하강시킬 때When lowering the boom rapidly below the maximum lowered position

이 경우 근접스위치(14)는 최대하강위치로 하강하는 붐을 감지하여 감지신호를 내보낸다. 이 근접스위치(14)의 감지신호는 릴레이스위치(15)의 전자코일에 인가되어 스위치를 통전위치로 절환시킴으로써 근접스위치(14)의 감지신호는 컷오프밸브(11)의 솔레노이드부(11a)에 인가된다. 이로써 상기 컷오프밸브(11)는 여자되어 입구를 탱크측으로 연결하도록 절환된다. 이 상태에서 작업자가 조이스틱밸브(5)를 조작하여 붐하강제어용 파이롯신호압을 발생시키더라도 그 파이롯신호압은 탱크로 드레인되어 붐 제어스풀은 중립상태를 유지하게 된다. 따라서 붐은 최대하강 위치 이하로 내려가지 않으므로 장비의 전복이나 어태치먼트의 손상을 막을 수 있는 것이다.In this case, the proximity switch 14 detects the boom descending to the maximum lowered position and emits a detection signal. The detection signal of the proximity switch 14 is applied to the electromagnetic coil of the relay switch 15 and the switch is switched to the energized position so that the detection signal of the proximity switch 14 is applied to the solenoid portion 11a of the cutoff valve 11. do. In this way, the cutoff valve 11 is excited and switched to connect the inlet to the tank side. In this state, even if the operator operates the joystick valve 5 to generate the pilot signal pressure for boom lowering control, the pilot signal pressure is drained to the tank so that the boom control spool is maintained in a neutral state. Therefore, the boom does not go below the maximum lowered position, thereby preventing the equipment from rolling over or damaging the attachment.

또한 상기 선택스위치(16)를 오프시켜 놓으면 컷오프밸브(11)의 솔레노이드부(11a)쪽으로는 근접스위치(14)의 감지신호가 차단되므로 붐은 아무런 제한없이하강동작을 하게 된다. 반대로 상기 선택스위치(16)를 온시켜 놓으면 상기 근접스위치(14)의 감지신호 유무에 따라 붐하강이 제한되게 된다.In addition, when the selection switch 16 is turned off, the detection signal of the proximity switch 14 is blocked toward the solenoid portion 11a of the cutoff valve 11, so that the boom is lowered without any limitation. On the contrary, when the selection switch 16 is turned on, the boom lowering is limited depending on the presence or absence of a detection signal of the proximity switch 14.

한편 본 발명의 붐하강 제어장치는 붐 최대하강위치를 감지하는 제1근접스위치(14)와, 붐 최대상승위치를 감지하는 제2근접스위치와, 상기 제1근접스위치의 작동시간과 제2근접스위치의 작동시간 차이에 의해 붐 하강속도를 측정하여 이 시간차가 미리 설정된 속도 이상일 경우에 상기 컷오프밸브의 솔레노이드부에 통전시키는 제어부를 포함한 구성으로 될 수 있다.On the other hand, the boom lowering control device of the present invention, the first proximity switch 14 for detecting the maximum boom lower position, the second proximity switch for sensing the maximum boom rising position, the operating time and the second proximity of the first proximity switch By measuring the boom lowering speed by the operation time difference of the switch can be configured to include a control unit for energizing the solenoid portion of the cut-off valve when the time difference is more than a predetermined speed.

상기한 바와 같이 구성된 본 발명의 붐하강 제어장치에 따르면 작업자가 미숙하거나 부주의로 붐을 급작스럽게 하강시키는 경우에도 붐이 일정한 위치 이하로는 하강하지 않게 되므로 급격한 붐하강에 의한 차량 전복사고나 어태치먼트의 파손을 방지할 수 있다.According to the boom lowering control apparatus of the present invention configured as described above, even if the operator is immature or inadvertently lowers the boom suddenly, the boom does not lower below a certain position, so the vehicle rollover accident or attachment due to the sudden boom lowering Breakage can be prevented.

Claims (4)

메인펌프(1)와, 메인펌프(1)에서 토출되는 압유의 방향을 제어하여 붐실린더로 압유를 공급 또는 차단하는 콘트롤밸브의 붐제어스풀(3)과, 보조펌프(4)에서 토출되는 압유를 감압하여 파이롯신호압을 생성하고, 이 파이롯신호압을 상기 붐제어스풀(3)의 좌우양측 수압부(3a,3b)에 선택적으로 작용시켜 상기 붐제어스풀(3)을 하강위치로 방향절환시키는 조이스틱밸브(5)를 포함한 유압중장비의 붐하강 제어장치에 있어서,The boom control spool 3 of the control valve which controls the direction of the main pump 1, the pressure oil discharged from the main pump 1, and supplies or shuts off the pressure oil to the boom cylinder, and the pressure oil discharged from the auxiliary pump 4 To generate a pilot signal pressure and selectively apply the pilot signal pressure to the left and right hydraulic pressure parts 3a and 3b of the boom control spool 3 to move the boom control spool 3 to the lowered position. In the boom lowering control device of the hydraulic heavy equipment including the joystick valve (5) to change direction, 붐(12)이 최대하강위치까지 하강하였을 때 이를 감지하여 신호를 발생시키는 붐 최대하강 감지수단과, 상기 조이스틱밸브(5)의 붐하강제어용 파이롯신호압을 콘트롤밸브의 붐제어스풀(3)의 수압부(3a)에 전달하는 붐하강 파이롯라인(10)상에 설치되어 상기 붐최대하강 감지수단의 감지신호에 의해 붐하강제어용 파이롯신호압을 통과시키거나 차단시키는 컷오프밸브(11)로 구성된 것을 특징으로 하는 유압중장비의 붐하강 제어장치.Boom maximum detection means for detecting the boom 12 when the boom 12 is lowered to the maximum lowered position to generate a signal, and the pilot signal pressure for boom lowering control of the joystick valve (5) of the boom control spool (3) Cut-off valve 11 is installed on the boom lowering pilot line 10 to be delivered to the hydraulic pressure section (3a) to pass or block the pilot signal pressure for boom lowering control by the detection signal of the boom maximum downward detection means Boom lowering control device of the hydraulic heavy equipment, characterized in that consisting of. 제1항에 있어서, 상기 컷오프밸브(11)는 솔레노이드밸브로 구성되고, 상기 붐 최대하강 감지수단은 붐(12)을 회동가능하게 지지한 센터프레임(13)상에 설치되어 최대하강위치로 회동한 붐을 감지하는 근접스위치(14)로 구성된 것을 특징으로 하는 유압중장비의 붐하강 제어장치.The method of claim 1, wherein the cut-off valve 11 is composed of a solenoid valve, the boom maximum downward detection means is installed on the center frame 13 to support the boom 12 to be rotated to the maximum downward position Boom lowering control device of the hydraulic heavy equipment, characterized in that consisting of a proximity switch for sensing a boom (14). 제2항에 있어서, 상기 센터프레임(13)상에는 붐(12)이 최대하강위치에 도달하기 전에 붐(12)의 위치를 감지하는 제2근접스위치(14a)를 더 설치하고, 상기 제2근접스위치(14a)에 의해 신호가 검출될 때 상기 컷오프밸브(11)를 일부만 차단되게 구성된 것을 특징으로 하는 유압중장비의 붐하강 제어장치.According to claim 2, On the center frame 13 is further provided with a second proximity switch 14a for detecting the position of the boom 12 before the boom 12 reaches the maximum lowered position, the second proximity When the signal is detected by the switch (14a) boom lowering control apparatus of the hydraulic heavy equipment, characterized in that configured to block only part of the cutoff valve (11). 제1항에 있어서, 상기 붐최대하강 감지수단과 컷오프밸브(11)는 선택스위치(16)를 개제하여 전기적으로 연결된 것을 특징으로 하는 중장비의 붐하강 제어장치.The boom lowering control apparatus according to claim 1, wherein the boom maximum downward detection means and the cutoff valve (11) are electrically connected to each other by a selection switch (16).
KR1020010042825A 2001-07-16 2001-07-16 Boom down control apparatus for a hydraulic heavy equipments KR100795612B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020010042825A KR100795612B1 (en) 2001-07-16 2001-07-16 Boom down control apparatus for a hydraulic heavy equipments

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020010042825A KR100795612B1 (en) 2001-07-16 2001-07-16 Boom down control apparatus for a hydraulic heavy equipments

Publications (2)

Publication Number Publication Date
KR20030008070A true KR20030008070A (en) 2003-01-24
KR100795612B1 KR100795612B1 (en) 2008-01-17

Family

ID=27715311

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020010042825A KR100795612B1 (en) 2001-07-16 2001-07-16 Boom down control apparatus for a hydraulic heavy equipments

Country Status (1)

Country Link
KR (1) KR100795612B1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20030058379A (en) * 2001-12-31 2003-07-07 대우종합기계 주식회사 Hydraulical control apparatus for a wheel loaded
KR100714182B1 (en) * 2006-02-16 2007-05-04 주식회사 자동기 Oil pressure device of snowplow
CN102102370A (en) * 2010-12-08 2011-06-22 太原重工股份有限公司 Lowing control system for movable arm of hydraulic excavator for mines
KR101324917B1 (en) * 2006-11-30 2013-11-01 두산인프라코어 주식회사 Device for controlling Boom of Excavator
KR20200115926A (en) 2019-03-29 2020-10-08 에이치앤피엔지니어링 (주) Control devices and methods of boom vibration for construction heavy equipment using sliding mode technique

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015068869A1 (en) * 2013-11-07 2015-05-14 볼보 컨스트럭션 이큅먼트 에이비 Hydraulic device for construction machine
KR102169314B1 (en) * 2014-04-14 2020-10-23 두산인프라코어 주식회사 Method of controlling a boom lock valve of an excavator, a unit for performing the method, and a safety apparatus for a boom of an excavator including the unit
KR101980909B1 (en) 2018-02-13 2019-05-21 강남국 Incoming auxiliary apparatus for high place working vehicle

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01167437U (en) * 1988-05-17 1989-11-24
JPH04202920A (en) * 1990-11-29 1992-07-23 Kubota Corp Boom height limiting device
JPH0885976A (en) * 1994-09-19 1996-04-02 Toyo Umpanki Co Ltd Boom speed control device of civil-engineering work vehicle
JPH08326091A (en) * 1995-05-30 1996-12-10 Toyo Umpanki Co Ltd Position control device of loading and unloading device
KR200155594Y1 (en) * 1997-09-30 1999-09-01 김형벽 Two level position control device of boom for construction heavy equipment

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20030058379A (en) * 2001-12-31 2003-07-07 대우종합기계 주식회사 Hydraulical control apparatus for a wheel loaded
KR100714182B1 (en) * 2006-02-16 2007-05-04 주식회사 자동기 Oil pressure device of snowplow
KR101324917B1 (en) * 2006-11-30 2013-11-01 두산인프라코어 주식회사 Device for controlling Boom of Excavator
CN102102370A (en) * 2010-12-08 2011-06-22 太原重工股份有限公司 Lowing control system for movable arm of hydraulic excavator for mines
KR20200115926A (en) 2019-03-29 2020-10-08 에이치앤피엔지니어링 (주) Control devices and methods of boom vibration for construction heavy equipment using sliding mode technique

Also Published As

Publication number Publication date
KR100795612B1 (en) 2008-01-17

Similar Documents

Publication Publication Date Title
KR101005060B1 (en) heavy equipment hydraulic circuit of having variable control device
EP2940315B1 (en) Hydraulic control device and construction machine with same
KR100621985B1 (en) System for driving
CN108966665B (en) Hydraulic control system for working machine
KR20080061164A (en) Impact easing apparatus of boom of excavator and control method thereof
KR100795612B1 (en) Boom down control apparatus for a hydraulic heavy equipments
JP2014206245A (en) Load holding device of hydraulic actuator circuit
CN107917114B (en) Method for detecting non-commanded spool positioning and preventing fluid flow to a hydraulic actuator
CN109996924B (en) Construction machine
JPWO2017164371A1 (en) Hydraulic system
JP4073074B2 (en) Mobile crane and supporting method thereof
KR200389671Y1 (en) Apparatus for reducing shock on the bucket of wheel typed loader in float down mode
KR101334469B1 (en) Hydraulic circuit device for excavator to relief shock of boom cylinder
JP2017125353A (en) Loading apparatus for wheel loader
KR101164669B1 (en) Method of and apparatus for controlling swing operation of an excavator
KR100813782B1 (en) Apparatus for preventing shock by quick operation
JP7469963B2 (en) Pile driver
JP3681548B2 (en) Hydraulic circuit for boom cylinder of hydraulic excavator
JP3707935B2 (en) Hydraulic circuit for boom cylinder of hydraulic excavator
JP4436241B2 (en) Construction vehicle
JP4069029B2 (en) Operating device for work equipment
KR20000015023U (en) Dozer automatic lifting control device of wheel type excavator
KR940000180Y1 (en) Oil-pressure control circuit for out-trigger cylinder in wheel type excavator
JP2002294760A (en) Backhoe
JP2726364B2 (en) Backhoe

Legal Events

Date Code Title Description
A201 Request for examination
E902 Notification of reason for refusal
E701 Decision to grant or registration of patent right
GRNT Written decision to grant
G170 Publication of correction
FPAY Annual fee payment

Payment date: 20101110

Year of fee payment: 6

FPAY Annual fee payment

Payment date: 20131113

Year of fee payment: 7

FPAY Annual fee payment

Payment date: 20141230

Year of fee payment: 8

FPAY Annual fee payment

Payment date: 20151201

Year of fee payment: 9

LAPS Lapse due to unpaid annual fee