KR100976924B1 - Arm locking apparatus with air ventilation in an excavator - Google Patents

Arm locking apparatus with air ventilation in an excavator Download PDF

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KR100976924B1
KR100976924B1 KR1020030079397A KR20030079397A KR100976924B1 KR 100976924 B1 KR100976924 B1 KR 100976924B1 KR 1020030079397 A KR1020030079397 A KR 1020030079397A KR 20030079397 A KR20030079397 A KR 20030079397A KR 100976924 B1 KR100976924 B1 KR 100976924B1
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South Korea
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pilot signal
hydraulic
arm
signal line
dark
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KR1020030079397A
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Korean (ko)
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KR20050045351A (en
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권성준
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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
    • 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
    • E02F9/226—Safety arrangements, e.g. hydraulic driven fans, preventing cavitation, leakage, overheating
    • 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)
  • Fluid-Pressure Circuits (AREA)
  • Operation Control Of Excavators (AREA)

Abstract

본 발명은 굴삭기의 암록킹장치에 관한 것으로, 특히 유압펌프(21)의 압유가 상기 암실린더(24)의 피스톤로드측 체임버(24b)로 유입하는 것은 자유롭게 허용하지만, 암실린더(24)의 로드측 체임버(24b)에서 압유가 배출되는 것은 파이롯제어밸브(27)에서 암크라우드 파이롯신호압이 인가될 때에만 허용하는 락밸브(28)를 포함하고, 상기 락밸브(28)를 연결할 때 암크라우드 파이롯신호라인(26a)에 유입된 공기를 그 암크라우드 파이롯신호라인(26a)의 압유와 함께 탱크(T)로 배출하여 공기를 제거하는 벤틸레이션밸브(30)를 포함한 것이다. The present invention relates to a female locking device of an excavator, in particular, the hydraulic pressure of the hydraulic pump 21 is freely allowed to flow into the piston rod side chamber 24b of the female cylinder 24, but the rod of the female cylinder 24 The discharge of the pressurized oil from the side chamber 24b includes a lock valve 28 allowing only when the dark crowd pilot signal is applied from the pilot control valve 27, and when the lock valve 28 is connected. The air flows into the dark crowd pilot signal line 26a together with the pressure oil of the dark crowd pilot signal line 26a to the tank T, and includes a ventilation valve 30 for removing the air.

굴삭기, 유압, 암록킹, 락밸브, 벤틸레이션Excavator, Hydraulic, Amlocking, Lock Valve, Ventilation

Description

유압라인의 공기제거장치를 구비한 굴삭기의 암 록킹장치{ Arm locking apparatus with air ventilation in an excavator}Arm locking apparatus with air ventilation in hydraulic excavator

도 1은 종래 굴삭기의 암록킹장치의 개략적인 유압회로도,1 is a schematic hydraulic circuit diagram of a female locking device of a conventional excavator;

도 2는 본 발명에 따른 굴삭기 암록킹장치의 개략적인 유압회로도이다.
2 is a schematic hydraulic circuit diagram of an excavator arm locking apparatus according to the present invention.

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

21: 유압펌프 22: 암크라우드 유압라인21: hydraulic pump 22: arm cloud hydraulic line

23: 암덤프 유압라인 24: 암실린더23: Arm dump hydraulic line 24: Arm cylinder

24a: 헤드측 체임버 24b: 로드측 체임버24a: head side chamber 24b: rod side chamber

25: 암제어스풀 25a,25b: 수압부25: arm control spool 25a, 25b: hydraulic part

P: 파이롯펌프P: pilot pump

26a: 암크라우드 파이롯신호라인 26b: 암덤프 파이롯신호라인26a: dark cloud pilot signal line 26b: dark dump pilot signal line

26c: 분기라인 26d: 체크밸브26c: branch line 26d: check valve

27: 파이롯제어밸브 28: 락밸브27: pilot control valve 28: lock valve

28a: 체크밸브 28b: 오리피스28a: check valve 28b: orifice

28c: 수압부 29: 스프링28c: hydraulic part 29: spring

30: 벤틸레이션밸브 31: 배출유로 30: Ventilation valve 31: Outlet flow path                 

32: 오리피스 33: 연결유로32: Orifice 33: Euro connection

34: 조작레버
34: control lever

본 발명은 굴삭기의 암록킹장치에 관한 것으로, 특히 암이 정지한 경우나 암실린더로 유압이 공급되지 않을 경우 암이 자중에 의해 낙하하는 것을 방지하기 위한 암록킹장치에 관한 것이다. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rocking device for an excavator, and more particularly to a rocking device for preventing the arm from falling by its own weight when the arm is stopped or when hydraulic pressure is not supplied to the arm cylinder.

굴삭기는 암이 정지한 경우 암실린더가 암 자체하중 때문에 침하하거나 암실린더의 피스톤헤드측 체임버에 연결된 유압라인이 파손되는 경우 암이 하강하는 경우가 발생한다. 이와 같이 암이 의도하지 않게 하강하는 것을 방지하지 위하여 굴삭기는 암록킹장치를 구비하고 있다. Excavators may cause the arm to descend when the arm cylinder is settled because of the arm's own load or the hydraulic line connected to the piston head chamber of the arm cylinder is damaged when the arm is stopped. In order to prevent the arm from inadvertently lowering as described above, the excavator is equipped with an arm locking device.

이러한 암록킹장치는 종래 도 1에 도시된 바와 같이, 일반적으로 굴삭기에서 운전하지 않을 때 암의 자중에 의한 하강을 억제하여 의도하지 않은 암크라우드에 따른 안전사고를 예방하고 장비의 손상을 방지하도록 하는 암록킹장치가 제안되어 있다 Such a rocking device, as shown in FIG. 1, generally suppresses the fall by the weight of the arm when not operating in an excavator, thereby preventing a safety accident due to an unintended arm cloud and preventing damage to equipment. A female locking device has been proposed.

이러한 암록킹장치는 도 1에 도시된 바와 같이, 유압펌프(1)의 압유를 방향제어하여 암크라우드 유압라인(2)과 암덤프 유압라인(3)을 통하여 암실린더(4)의 헤드측 체임버(4a)나 로드측 체임버(4b)에 선택적으로 공급하는 암제어스풀(5)와, 파이롯펌프(P)의 압유를 감압하여 상기 암제어스풀(5)의 양쪽 각 수압부(5a,5b)에 암크라우드 및 암덤프 파이롯신호를 제공하는 파이롯제어밸브(7)를 포함하고, 상기 유압펌프(1)의 압유가 상기 암실린더(4)의 피스톤로드측 체임버(4b)로 유입될 때에는 자유로이 유입되게 하지만, 배출은 파이롯제어밸브(7)의 암크라우드 파이롯신호가 인가될 때에만 허용하는 락밸브(8)로 구성되어 있다. As shown in FIG. 1, the female locking device directionally controls the hydraulic pressure of the hydraulic pump 1 so that the head-side chamber of the female cylinder 4 is provided through the female crowd hydraulic line 2 and the female dump hydraulic line 3. Arm control spool 5 to selectively supply to 4a or the rod side chamber 4b, and the hydraulic pressure of the pilot pump P to decompress | reduce the pressure receiving parts 5a and 5b of both arm control spools 5, respectively. ) And a pilot control valve (7) for providing a dark crowd and a female dump pilot signal, the pressure oil of the hydraulic pump (1) to be introduced into the piston rod side chamber (4b) of the arm cylinder (4) Although freely flowed in at the time, the discharge is composed of a lock valve 8 which allows only when the dark crowd pilot signal of the pilot control valve 7 is applied.

그런데 상기한 바와 같은 락밸브(8)를 장착할 때 암크라우드 파이롯라인(6a)에 공기가 유입되어 잔류하게 되고, 이 공기는 암제어스풀(5)에 파이롯신호가 작용할 때 제어하는데 장애가 되므로 배출시켜야 한다. 상기 파이롯라인에 유입된 공기를 제거할 때 종래에는 한사람은 파이롯신호라인의 유압호스를 풀고 다른 사람은 장비를 운전시켜 공기가 들어 있는 유압라인으로 압유를 공급함으로써 공기가 압유에 밀려서 배출되게 하였다. 이와 같은 작업은 고압의 유압을 작동시켜야 하므로 안전사고의 위험이 있고, 공기를 배출할 때 작업유도 배출되면서 장비를 더럽히는 문제점이 있었다. However, when the lock valve 8 is mounted as described above, air flows into the dark crowd pilot line 6a and remains, and this air is difficult to control when a pilot signal is applied to the arm control spool 5. Should be discharged. When removing air introduced into the pilot line, one person loosens the hydraulic hose of the pilot signal line and the other operates the equipment to supply the pressurized oil to the hydraulic line containing the air so that the air is pushed out by the pressurized oil. It was. This operation has a risk of a safety accident because it has to operate a high-pressure hydraulic pressure, there is a problem that dirty the equipment while the working oil is also discharged when the air is discharged.

이에 본 발명은 굴삭기의 암록킹장치의 유압라인에 유입된 공기를 유압호스나 유압라인의 해체없이 간단히 제거할 수 있는 공기제거장치를 구비한 암록킹장치를 제공함에 목적이 있다. Accordingly, an object of the present invention is to provide a female locking device having an air removing device that can easily remove the air flowing into the hydraulic line of the female locking device of the excavator without disassembly of the hydraulic hose or the hydraulic line.

상기 목적을 달성하기 위한 본 발명은 유압펌프의 압유를 방향제어하여 암크라우드 유압라인과 암덤프 유압라인을 통하여 암실린더의 헤드측 체임버나 로드측 체임버에 선택적으로 공급하는 암제어밸브와, 상기 암제어밸브의 양쪽 각 수압부에 암덤프 및 암크라우드 파이롯신호를 제공하는 파이롯제어밸브와, 상기 암크라우드 파이롯신호라인과 수압부가 연결되어, 상기 유압펌프의 압유를 상기 암실린더의 로드측 체임버로 유입시는 자유로이 유입되게 하지만, 배출은 상기 파이롯제어밸브의 암크라우드 파이롯신호압이 인가될 때에만 허용하는 락밸브를 포함한 굴삭기의 암록킹장치에 있어서, In order to achieve the above object, the present invention provides an arm control valve for selectively supplying a head chamber or a rod side chamber of an arm cylinder through an arm cloud hydraulic line and an arm dump hydraulic line by controlling the pressure of the hydraulic pump. A pilot control valve for providing a female dump and a dark crowd pilot signal to both hydraulic sections of the control valve, and the dark crowd pilot signal line and the hydraulic section are connected to supply the hydraulic pressure of the hydraulic pump to the rod side of the female cylinder. In the rocking device of an excavator including a lock valve that allows free flow when the chamber is introduced into the chamber, but the discharge is allowed only when the dark crowd pilot signal pressure of the pilot control valve is applied.

상기 파이롯제어밸브의 암크라우드 파이롯신호라인에 연결되어 상기 암크라우드 파이롯신호라인상에 설치되며, 상기 암크라우드 파이롯신호라인을 상기 락밸브의 수압부와 연통시키는 연결유로와, 탱크로 연통시키는 배출유로를 구비한 벤틸레이션밸브를 더 구비한 구성에 특징이 있다. 상기 배출유로에는 오리피스가 구비된다.
A connection flow path connected to the female crowd pilot signal line of the pilot control valve and installed on the female crowd pilot signal line, the connection flow passage communicating the female crowd pilot signal line with the hydraulic part of the lock valve; A feature is further provided of a ventilation valve having a discharge passage for communicating therewith. The discharge passage is provided with an orifice.

이하, 본 발명에 따른 굴삭기의 암록킹장치의 실시예를 첨부도면에 따라 상세히 설명한다. Hereinafter, the embodiment of the rocking device of the excavator according to the present invention will be described in detail according to the accompanying drawings.

본 발명에 따른 굴삭기의 암록킹장치는, 도 2에 도시된 바와 같이, 유압펌프(21)의 압유를 방향제어하여 암크라우드 유압라인(22)과 암덤프 유압라인(23)을 통하여 각각 암실린더(24)의 헤드측 체임버(24a)나 로드측 체임버(24b)에 선택적으로 공급하는 암제어스풀(25)와, 파이롯펌프(P)의 압유를 감압하여 상기 암제어스풀(25)의 양쪽 각 수압부(25a,25b)에 암크라우드 및 암덤프 파이롯신호를 각각의 파이롯신호라인(26a,26b)을 통하여 제공하는 파이롯제어밸브(27)와, 상기 암크라우드 파이롯신호라인(26a)과 상기 락밸브(28)의 수압부(28c)가 연결되어, 상기 유압펌프(21)의 압유가 상기 암실린더(24)의 피스톤로드측 체임버(24b)로 유입하는 것은 자유롭게 허용하지만, 암실린더(24)의 로드측 체임버(24b)에서 압유가 배출되는 것은 상기 파이롯제어밸브(27)에서 암크라우드 파이롯신호압이 인가될 때에만 허용하는 락밸브(28)를 포함한다. The rocking device of the excavator according to the present invention, as shown in Figure 2, by controlling the direction of the hydraulic pressure of the hydraulic pump 21 through the arm cloud hydraulic line 22 and the arm dump hydraulic line 23 respectively cylinders Both the arm control spool 25 and the arm control spool 25 for supplying selectively to the head side chamber 24a and the rod side chamber 24b of the 24 and the pressure oil of the pilot pump P are reduced. A pilot control valve 27 for providing the female crowd and female dump pilot signals to the hydraulic units 25a and 25b through respective pilot signal lines 26a and 26b, and the female crowd pilot signal line ( 26a) and the hydraulic pressure portion 28c of the lock valve 28 are connected to allow the hydraulic oil of the hydraulic pump 21 to flow into the piston rod side chamber 24b of the female cylinder 24 freely. The discharge of the pressurized oil from the rod side chamber 24b of the arm cylinder 24 is caused by the dark crowd at the pilot control valve 27. It includes a lock valve 28 to allow only when the pilot signal pressure is applied.

상기 락밸브(28)는 상기 유압펌프(21)에서 암실린더(24)의 피스톤로드측 체임버(24b)로는 압유를 통과시키지만, 암실린더(24)의 피스톤로드측 체임버(24b)에서 탱크(T)로 배출되는 압유의 흐름은 저지하는 체크밸브(28a)와, 상기 암실린더(24)의 피스톤로드측 체임버(24b)에서 탱크(T)로 배출되는 압유를 지연시키는 오리피스(28b)을 포함하고, 한쪽은 스프링(29)으로 지지되어 탱크(T)에 연결되고 다른 쪽에는 수압부(28c)가 구비되어 암크라우드 파이롯신호가 작용하도록 암크라우드 파이롯신호라인(26a)에서 분기된 분기라인(26c)이 체크밸브(26d)를 게재하여 연결되어 있다. The lock valve 28 passes the hydraulic oil from the hydraulic pump 21 to the piston rod side chamber 24b of the arm cylinder 24, but the tank T in the piston rod side chamber 24b of the arm cylinder 24. The flow of the pressurized oil discharged to) includes a check valve 28a for blocking and an orifice 28b for delaying the pressurized oil discharged from the piston rod side chamber 24b of the arm cylinder 24 to the tank T. One side is supported by a spring 29 is connected to the tank (T) and the other side is provided with a hydraulic pressure portion 28c branch line branched from the dark crowd pilot signal line 26a to act the dark crowd pilot signal 26c is connected by placing the check valve 26d.

그리고 상기 암크라우드 파이롯신호라인(26a)안에 유입된 공기를 배출하기 위한 벤틸레이션밸브(30)가 상기 파이롯제어밸브(27)와 락밸브(28)의 수압부(28c)를 연결하는 암크라우드 파이롯신호라인(26a)상에 연결되어 설치되어 있다. And the ventilating valve 30 for discharging the air introduced into the female crowd pilot signal line 26a, the female connecting the pilot control valve 27 and the hydraulic pressure portion 28c of the lock valve 28 It is connected to and installed on the crowd pilot signal line 26a.

상기 벤틸레이션 밸브(30)는 오리피스(32)를 게재하여 상기 암크라우드 파이롯신호라인(26a)을 탱크(T)로 연결하는 배출유로(31)와, 상기 암크라우드 파이롯신호라인(26a)과 탱크(T)를 연결하는 배출유로(31)를 차단하고, 파이롯신호라인(26a)을 연결하는 연결유로(33)을 구비하고, 상기 배출유로(31)와 연결유로(33)사이의 위치절환은 조작레버(34)에 의해 이루어지게 되어 있다. 그러나 상기 벤틸레이션밸브(30)는 솔레노이드밸브로 구성하여 상기 위치절환은 솔레노이드에 의해 이루어지게 할 수도 있다. The ventilation valve 30 has an orifice 32 for discharging the flow passage 31 connecting the dark crowd pilot signal line 26a to the tank T, and the dark crowd pilot signal line 26a. And a discharge flow path 31 for connecting the tank T to the tank T, and a connection flow path 33 for connecting the pilot signal line 26a, between the discharge flow path 31 and the connection flow path 33. The position switching is made by the operation lever 34. However, the ventilation valve 30 may be configured as a solenoid valve so that the position switching may be performed by the solenoid.

상기한 바와 같은 본 발명은 락밸브를 연결설치할 때 암크라우드 파이롯신호라인(26a)안으로 공기가 유입된 경우, 상기 벤틸레이션 밸브(30)를 조작레버(34)로 조작하여 암크라우드 파이롯신호라인(26a)를 배출유로(31)를 통하여 탱크(T)에 연통시켜 그 파이롯신호라인(26a)에 들어 있던 공기를 파이롯압유와 함께 탱크로 배출함으로써 제거할 수 있다. According to the present invention as described above, when air is introduced into the female crowd pilot signal line 26a when the lock valve is connected and installed, the female crowd pilot signal is operated by operating the ventilation valve 30 with the operation lever 34. The line 26a is communicated with the tank T via the discharge flow path 31, and the air contained in the pilot signal line 26a can be removed together with the pilot pressure oil to the tank.

본 발명은 필요한 경우 파이롯유압라인에 들어 있는 공기를 간단히 제거하여 장비의 제어성능을 유지할 수 있고, 유압라인의 공기를 제거하는데 장비의 가동을 중지할 필요가 없으므로 보수작업이 편리한 장점이 있다. The present invention can easily maintain the control performance of the equipment by simply removing the air in the pilot hydraulic line if necessary, there is no need to stop the operation of the equipment to remove the air in the hydraulic line has the advantage of convenient maintenance work.

Claims (3)

유압펌프(21)의 압유를 방향제어하여 암크라우드 유압라인(22)과 암덤프 유압라인(23)을 통하여 각각 암실린더(24)의 헤드측 체임버(24a)나 로드측 체임버(24b)에 선택적으로 공급하는 암제어스풀(25)와, 파이롯펌프(P)의 압유를 감압하여 상기 암제어스풀(25)의 양쪽 각 수압부(25a,25b)에 암크라우드 및 암덤프 파이롯신호를 각각의 파이롯신호라인(26a,26b)을 통하여 제공하는 파이롯제어밸브(27)와, 상기 암크라우드 파이롯신호라인(26a)과 수압부(28c)가 연결되어, 상기 유압펌프(21)의 압유가 상기 암실린더(24)의 피스톤로드측 체임버(24b)로 유입하는 것은 자유롭게 허용하지만, 암실린더(24)의 로드측 체임버(24b)에서 압유가 배출되는 것은 상기 파이롯제어밸브(27)에서 암크라우드 파이롯신호압이 인가될 때에만 허용하는 락밸브(28)를 포함한 굴삭기의 암록킹장치에 있어서, The pressure control of the hydraulic pump 21 is directionally controlled to selectively the head side chamber 24a or the rod side chamber 24b of the arm cylinder 24 through the arm cloud hydraulic line 22 and the arm dump hydraulic line 23, respectively. The pressure control of the arm control spool 25 and the pilot pump P are supplied to the pressure control unit 25a and 25b of the arm control spool 25 to respectively provide the dark crowd and the dark dump pilot signals, respectively. The pilot control valve 27 provided through the pilot signal line 26a, 26b of the, and the female crowd pilot signal line 26a and the hydraulic pressure unit 28c is connected, While it is free to allow the hydraulic oil to flow into the piston rod side chamber 24b of the dark cylinder 24, it is possible that the pressure oil is discharged from the rod side chamber 24b of the dark cylinder 24. To the rock-locking device of the excavator, including the lock valve 28, which allows only when the female crowd pilot signal pressure is applied. In 상기 암크라우드 파이롯신호라인(26a) 상에 설치되어 암크라우드 파이롯신호라인(26a) 안으로 공기가 유입되면, 파이롯압유와 함께 탱크(T)로 배출시키는 벤틸레이션 밸브(30)를 더 포함하고, Further installed on the dark crowd pilot signal line 26a, when the air flows into the dark crowd pilot signal line 26a, further includes a ventilation valve 30 to discharge to the tank (T) with the pilot pressure oil and, 상기 벤틸레이션 밸브(30)는 상기 암크라우드 파이롯신호라인(26a)을 상기 락밸브(28)의 수압부(28c)에 연통시키는 연결유로(33)와, 상기 암크라우드 파이롯신호라인(26a)을 탱크(T)에 연통시키는 배출유로(31)와, 상기 연결유로(33)와 배출유로 (31) 중 어느 하나를 암크라우드 파이롯신호라인(26a)에 선택적으로 연결되도록 상기 벤틸레이션 밸브(30)를 조작하는 조작레버(34)를 포함하는 유압라인의 공기제거장치를 구비한 굴삭기의 암 록킹장치. The ventilation valve 30 has a connection flow path 33 for communicating the female crowd pilot signal line 26a to the hydraulic unit 28c of the lock valve 28, and the female crowd pilot signal line 26a. Ventilation valve to selectively connect any one of the discharge passage 31 and the connection passage 33 and the discharge passage 31 to the dark crowd pilot signal line 26a to communicate with the tank (T) An arm locking device for an excavator provided with an air removing device of a hydraulic line including an operating lever 34 for operating the 30. 제1항에 있어서, 상기 벤틸레이션 밸브(30)의 배출유로(31)에는 오리피스(32)를 구비한 것을 특징으로 하는 유압라인의 공기제거장치를 구비한 굴삭기의 암록킹장치. The rocking device of the excavator according to claim 1, wherein an orifice (32) is provided in the discharge passage (31) of the ventilation valve (30). 삭제delete
KR1020030079397A 2003-11-11 2003-11-11 Arm locking apparatus with air ventilation in an excavator KR100976924B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023195578A1 (en) * 2022-04-04 2023-10-12 주식회사 대진에이치에스 Safety lock valve including logic valve capable of pilot pressure supply control

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5570670U (en) * 1978-11-08 1980-05-15
JPH02186108A (en) * 1989-01-11 1990-07-20 Hitachi Ltd Hydraulic cylinder
JP2001355605A (en) 2000-06-12 2001-12-26 Meiki Co Ltd Hydraulic fluid filling method and venting method for hydraulic close circuit device, and hydraulic closed circuit device capable of venting
KR20030058384A (en) * 2001-12-31 2003-07-07 대우종합기계 주식회사 boom control device in an excavator

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5570670U (en) * 1978-11-08 1980-05-15
JPH02186108A (en) * 1989-01-11 1990-07-20 Hitachi Ltd Hydraulic cylinder
JP2001355605A (en) 2000-06-12 2001-12-26 Meiki Co Ltd Hydraulic fluid filling method and venting method for hydraulic close circuit device, and hydraulic closed circuit device capable of venting
KR20030058384A (en) * 2001-12-31 2003-07-07 대우종합기계 주식회사 boom control device in an excavator

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023195578A1 (en) * 2022-04-04 2023-10-12 주식회사 대진에이치에스 Safety lock valve including logic valve capable of pilot pressure supply control

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