KR100795612B1 - Boom down control apparatus for a hydraulic heavy equipments - Google Patents

Boom down control apparatus for a hydraulic heavy equipments Download PDF

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Publication number
KR100795612B1
KR100795612B1 KR1020010042825A KR20010042825A KR100795612B1 KR 100795612 B1 KR100795612 B1 KR 100795612B1 KR 1020010042825 A KR1020010042825 A KR 1020010042825A KR 20010042825 A KR20010042825 A KR 20010042825A KR 100795612 B1 KR100795612 B1 KR 100795612B1
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South Korea
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boom
control
valve
maximum
pilot signal
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KR1020010042825A
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Korean (ko)
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KR20030008070A (en
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김성일
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두산인프라코어 주식회사
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    • 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

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  • 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

본 발명은 굴삭기와 같은 유압중장비의 붐이 최대하강위치 아래로 하강하지 않도록 제어하는 붐하강제어장치에 관한 것이다. 본 발명은 조이스틱밸브(5)의 붐제어용 파이롯신호압을 콘트롤밸브의 붐제어스풀(3)에 전달하는 붐하강 파이롯라인(10)상에 설치된 컷오프밸브(11)가 붐이 최대하강위치까지 하강하였을 때 이를 감지하여 신호를 송출하는 근접스위치(14)의 감지신호에 의해 조이스틱밸브(5)의 붐제어용 파이롯신호압을 탱크로 드레인시켜 붐하강을 정지시키도록 구성된다. The present invention relates to a boom lowering control device for controlling the boom of the hydraulic heavy equipment such as an excavator does not lower below the maximum lowered position. According to the present invention, the cut-off valve 11 installed on the boom lowering pilot line 10 which transmits the pilot signal pressure for boom control of the joystick valve 5 to the boom control spool 3 of the control valve has a maximum boom lowering position. It is configured to stop the boom lowering by draining the pilot signal pressure for the boom control of the joystick valve (5) to the tank by the detection signal of the proximity switch 14, which detects this when it descends to the end.

상기한 본 발명은 붐에 무거운 하중이 걸려진 상태에서 운전자가 붐을 급격이 하강시키더라도 일정한 위치 이하로 하강하게 되면 상기 붐제어스풀(3)에 공급되는 붐 하강용 파이롯신호를 차단하여 붐의 하강을 정지시키게 되므로 무거운 하중체의 관성에 의해 차량이 전복되는 사고를 방지하고, 붐 선단에 부착된 어태치먼트가 급격한 하강에 의해 지면과 충돌하여 파손되는 것을 방지할 수 있다.The present invention described above blocks the boom lowering pilot signal supplied to the boom control spool (3) when the driver descends below a certain position even when the driver suddenly lowers the boom in a state where heavy load is applied to the boom. Because it stops the fall of the vehicle is prevented the accident of overturning the vehicle by the inertia of the heavy load body, it is possible to prevent the attachment attached to the tip of the boom from colliding with the ground by the sudden fall and breakage.

유압중장비, 붐급속하강, 제어Hydraulic heavy equipment, boom lowering, control

Description

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

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: 릴레이스위치 14a: second proximity switch 15: relay switch

16: 선택스위치
16: selector switch

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.

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 상기 붐제어스풀을 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 actuating 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 방 향절환시키는 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; It comprises a joystick valve (5) for selectively acting on the hydraulic pressure section (3a, 3b) to change the direction of 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 so that 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 제한없이 하강동작을 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)

삭제delete 삭제delete 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 발생시키고, 상기 붐(12)을 회동가능하게 지지한 센터프레임(13)상에 설치되어 최대하강위치로 회동한 붐(12)을 감지하는 근접스위치(14)로 구성된 붐 최대하강 감지수단과,When the boom 12 is lowered to the maximum lowered position, it detects this, generates a signal, and is installed on the center frame 13 supporting the boom 12 to be rotatable, and the boom 12 rotated to the maximum lowered position. Boom maximum detection means consisting of a proximity switch 14 for detecting the; 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 솔레노이드 밸브로 구성된 컷오프밸브(11)를 포함하고,Installed on the boom lowering pilot line 10 for transmitting the pilot signal pressure for boom lowering control of the joystick valve (5) to the hydraulic pressure section (3a) of the boom control spool (3) of the control valve to detect the maximum boom falling A cutoff valve (11) composed of a solenoid valve for passing or blocking a pilot signal pressure for boom lowering control by means of a detection signal of the means, 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.On the center frame 13, a second proximity switch 14a for detecting the position of the boom 12 is further installed before the boom 12 reaches the maximum lowered position, and by the second proximity switch 14a. When the signal is detected, the boom lowering control device of the hydraulic heavy equipment, characterized in that configured to block only part of the cutoff valve (11). 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,A boom maximum downward detection means for detecting a signal when the boom 12 is lowered to a maximum downward position and generating a signal; 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 포함하고,Installed on the boom lowering pilot line 10 for transmitting the pilot signal pressure for boom lowering control of the joystick valve (5) to the hydraulic pressure section (3a) of the boom control spool (3) of the control valve to detect the maximum boom falling And a cutoff valve 11 for passing or blocking the pilot signal pressure for boom lowering control by a detection signal of the means, 상기 붐최대하강 감지수단과 컷오프밸브(11)는 선택스위치(16)를 개제하여 전기적으로 연결된 것을 특징으로 하는 유압중장비의 붐하강 제어장치.The boom lowering detection means and the cut-off valve 11 is the boom lowering control apparatus of the hydraulic heavy equipment, characterized in that electrically connected by opening the selection switch (16).
KR1020010042825A 2001-07-16 2001-07-16 Boom down control apparatus for a hydraulic heavy equipments KR100795612B1 (en)

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