KR101155600B1 - The pipeless hydraulic drive mechanism for high voltage gis - Google Patents

The pipeless hydraulic drive mechanism for high voltage gis Download PDF

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KR101155600B1
KR101155600B1 KR1020070106000A KR20070106000A KR101155600B1 KR 101155600 B1 KR101155600 B1 KR 101155600B1 KR 1020070106000 A KR1020070106000 A KR 1020070106000A KR 20070106000 A KR20070106000 A KR 20070106000A KR 101155600 B1 KR101155600 B1 KR 101155600B1
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South Korea
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oil
cylinder
oil tank
accumulator
hydraulic drive
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KR1020070106000A
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Korean (ko)
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KR20090040576A (en
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이진섭
김경민
허규대
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현대중공업 주식회사
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1423—Component parts; Constructional details
    • F15B15/1428—Cylinders
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/149—Fluid interconnections, e.g. fluid connectors, passages
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
  • Supply Devices, Intensifiers, Converters, And Telemotors (AREA)

Abstract

본 발명의 초고압 차단기용 파이프레스 유압 구동장치는 오일탱크에서 축압장치로 오일을 공급하는 펌프와, 축압장치에서 공급된 오일을 실린더를 거처 오일탱크로 드레인 되도록 한 유압구동장치에 있어서, 상기 실린더는 오일탱크와 직접 체결하여 실린더의 오일을 오일탱크에 직접 드레인 시킬 수 있도록 드레인 유로를 갖는 실린더블록을 포함한다. In the ultra-high pressure circuit breaker for the ultra-high pressure circuit breaker of the present invention, the pump for supplying oil from the oil tank to the accumulator, and the hydraulic drive device to drain the oil supplied from the accumulator to the oil tank via the cylinder, the cylinder is It includes a cylinder block having a drain flow path to be directly coupled to the oil tank to drain the oil of the cylinder directly to the oil tank.

차단기, 구동장치, 직접, 실린더, 블록, 누유방지 Breaker, Drive, Direct, Cylinder, Block, Leakage Prevention

Description

초고압 차단기용 파이프레스 유압 구동장치{THE PIPELESS HYDRAULIC DRIVE MECHANISM FOR HIGH VOLTAGE GIS}Pipeless Hydraulic Drive for Ultra High Voltage Breakers {THE PIPELESS HYDRAULIC DRIVE MECHANISM FOR HIGH VOLTAGE GIS}

본 발명은 초고압 차단기용 파이프레스 유압 구동장치에 관한 것으로서, 더 상세하게는 초고압 차단기에 설치되어 구동하는 유압구동장치의 오일 공급 및 드레인 파이프를 제거하여 구조를 간단하게 하고, 누유를 줄인 초고압 차단기용 파이프레스 유압 구동장치에 관한 것이다.The present invention relates to a pipeless hydraulic drive device for an ultra-high pressure circuit breaker, and more particularly, to remove the oil supply and drain pipe of the hydraulic drive device installed and driven in the ultra-high pressure circuit breaker to simplify the structure, reducing the leakage of the ultra-high pressure circuit breaker It relates to a pipeless hydraulic drive.

일반적으로 초고압 차단기는 고전압을 개폐시키는 것으로 주로 6불화황 가스를 이용하여 개폐시 발생되는 아크를 소호시켜 절연될 수 있도록 하는 가스절연개폐장치(GIS : Gas Insulated Switchgear)가 많이 적용되고 있다.In general, ultra-high voltage circuit breakers open and close high voltages, and gas insulated switchgear (GIS) has been widely applied to insulate arcs generated during opening and closing by using sulfur hexafluoride gas.

도 1은 종래의 초고압 차단기용 유압 구동장치를 보인 구성도이다. 1 is a configuration diagram showing a conventional hydraulic drive device for a high voltage circuit breaker.

이러한 초고압 차단기는 차단기를 개폐시키기 위해서 유압구동장치가 설치되고, 상기 유압구동장치는 도 1에 도시한 바와 같이 일정한 양의 오일을 수용하여 저장하는 오일탱크(1)와, 오일을 축압시키는 축압장치(3)와, 오일탱크(1)에서 축압장치(3)로 오일을 공급하는 펌프모듈(2)과, 오일탱크(1)에서 축압장치(3)로 오일을 공급할 수 있게 유로를 형성하는 공급파이프(6)와, 축압장치(3)에서 축압 된 오일 에 의해 차단기를 개폐 동작하는 실린더(4)와, 실린더(4)에서 오일탱크(1)로 드레인 시킬 수 있도록 하는 드레인 파이프(5)로 구성된다. The ultra-high pressure breaker is provided with a hydraulic drive device for opening and closing the breaker, the hydraulic drive device is an oil tank (1) for receiving and storing a certain amount of oil as shown in Figure 1, and a pressure accumulator to accumulate oil (3), a pump module (2) for supplying oil from the oil tank (1) to the accumulator (3), and a supply for forming a flow path for supplying oil from the oil tank (1) to the accumulator (3). With a pipe 6, a cylinder 4 for opening and closing the breaker by oil accumulated in the accumulator 3, and a drain pipe 5 for draining the cylinder 4 from the oil tank 1 It is composed.

그런데 종래의 유압구동장치는 고압의 오일이 오일탱크(1)에서 공급파이프(6)와, 드레인 파이프(5), 펌프모듈(2) 및 실린더(4) 그리고 축압장치를 순환하기 때문에 유압구동장치에 설치되어 있는 파이프(5,6)는 누유(Leak)에 노출된다. 즉, 차단기의 개폐동작 과정에서 진동과, 오일의 고압 그리고 패킹의 마모 및 손상에 의해 쉽게 누유에 노출되어 있다. However, in the conventional hydraulic drive system, since the high pressure oil circulates the supply pipe 6, the drain pipe 5, the pump module 2 and the cylinder 4, and the accumulator in the oil tank 1, the hydraulic drive device The pipes 5 and 6 installed in the are exposed to leaks. In other words, during the opening and closing operation of the breaker, it is easily exposed to leakage due to vibration, high pressure of oil and wear and damage of packing.

따라서 오일 누유가 발생되면, 유압구동장치 고유의 기능을 상실하게 되는 문제가 있다. Therefore, when oil leakage occurs, there is a problem in that the hydraulic drive loses its unique function.

본 발명은 상기의 필요성을 감안하여 창출된 것으로서, 유압구동장치를 연결하는 연결부위를 최대한 줄여 구조를 간단하게 하면서 누유를 줄일 수 있도록 하는 초고압 차단기용 파이프레스 유압 구동장치를 제공함에 그 목적이 있다. The present invention has been made in view of the above necessity, and an object thereof is to provide a pipeless hydraulic drive device for an ultra-high pressure circuit breaker that can reduce the leakage while simplifying the structure by reducing the connection part connecting the hydraulic drive device as much as possible. .

상기의 목적을 달성하기 위한 본 발명의 초고압 차단기용 파이프레스 유압 구동장치는 오일탱크에서 축압장치로 오일을 공급하는 펌프모듈과, 축압장치에서 공급된 오일을 실린더를 거처 오일탱크로 드레인 되도록 한 유압구동장치에 있어서, 상기 실린더는 오일탱크와 직접 체결하여 실린더의 오일을 오일탱크에 직접 드레인 시킬 수 있도록 드레인 유로를 갖는 실린더블록을 포함한다. The ultra-high pressure breaker pipeless hydraulic drive device of the present invention for achieving the above object is a pump module for supplying oil from the oil tank to the accumulator, and the hydraulic oil to drain the oil supplied from the accumulator to the oil tank via the cylinder In the drive device, the cylinder includes a cylinder block having a drain flow path so as to be directly coupled to the oil tank to drain the oil of the cylinder directly to the oil tank.

여기서 상기 실린더블록의 내부에는 상기 오일탱크에서 축압장치로 오일이 공급될 수 있게 공급유로를 포함하며, 상기 오일공급유로 상에는 축압장치로 오일을 공급하는 펌프블록을 포함하는 것이 바람직하다. Here, the cylinder block may include a supply passage so that oil may be supplied to the accumulator from the oil tank, and the oil block may include a pump block for supplying oil to the accumulator.

또한, 상기 실린더블록에는 상기 축압장치가 직접 체결되며, 상기 축압장치는 상기 공급유로와 연결되는 것이 바람직하다. In addition, the accumulator is directly coupled to the cylinder block, the accumulator is preferably connected to the supply passage.

그리고 상기 펌프는 상기 오일탱크를 일체화 시키는 펌프블록을 포함하며, 상기 펌프블록은 상기 실린더블록에 직접체결 되어 드레인 유로와 오일탱크가 연결되는 것이 바람직하다. And the pump includes a pump block for integrating the oil tank, the pump block is preferably directly connected to the cylinder block is connected to the drain flow path and the oil tank.

상술한 바와 같이 공급유로와 드레인유로를 형성한 실린더블록을 포함하는 본 발명의 초고압 차단기용 파이프레스 유압 구동장치는 오일 순환에 따른 연결부위를 줄여 누유를 줄일 수 있는 효과가 있다. As described above, the pipeless hydraulic drive device for an ultra-high pressure circuit breaker of the present invention including a cylinder block having a supply flow path and a drain flow path has an effect of reducing leakage by reducing a connection part due to oil circulation.

또한, 실린더블록에 오일탱크 및 펌프모듈 그리고 축압장치를 직접체결하므로서 구성이 간단해지는 효과가 있다. In addition, by directly connecting the oil tank, the pump module and the accumulator to the cylinder block there is an effect of simplifying the configuration.

이하 첨부된 도면을 참조하면서 본 발명에 따른 바람직한 실시예를 상세히 설명하기로 한다. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

본 발명을 설명함에 있어서, 정의되는 용어들은 본 발명에서의 기능을 고려하여 정의 내려진 것으로, 본 발명의 기술적 구성요소를 한정하는 의미로 이해되어서는 아니 될 것이다.In describing the present invention, the defined terms are defined in consideration of the function of the present invention, and should not be understood in a limiting sense of the technical elements of the present invention.

도 2는 본 발명의 일실시예에 따른 초고압 차단기용 파이프레스 유압 구동장치를 보인 구성도이다. Figure 2 is a block diagram showing a pipeless hydraulic drive device for an ultra-high pressure breaker according to an embodiment of the present invention.

도 2에 도시한 바와 같이 본 발명의 초고압 차단기용 파이프레스 유압 구동장치(100)는 일정량의 오일을 수용하는 오일탱크(10)와, 펌프(21)가 구비된 펌프블록(20)과, 펌프블록(20)에서 공급되는 오일을 축압시키는 축압장치(30)와, 축압장치(30)에서 축압된 오일이 공급되는 실린더(41) 및 실린더(41)를 오일탱크(10)에 직접 체결시키는 실린더블록(40)을 포함한다. 여기서 오일탱크(10)와, 펌프블록(20)과 축압장치(30) 및 실린더(41)는 공지된 기술이므로 상세한 설명은 생략한다. As shown in FIG. 2, the ultra-high pressure circuit breaker hydraulic driving device 100 according to the present invention includes an oil tank 10 accommodating a predetermined amount of oil, a pump block 20 provided with a pump 21, and a pump. A accumulator 30 for accumulating the oil supplied from the block 20, and a cylinder 41 for fastening the cylinder 41 and the cylinder 41 to which the oil accumulated from the accumulator 30 is directly supplied to the oil tank 10. Block 40. Here, the oil tank 10, the pump block 20, the accumulator 30, and the cylinder 41 are well known technologies, and thus detailed descriptions thereof will be omitted.

실린더블록(40)은 실린더(41)가 설치되거나 포함하는 블록이며, 오일탱크(10)와 실린더(41)가 직접 체결될 수 있도록 하여 종래의 드레인 파이프를 제거할 수 있도록 한다. Cylinder block 40 is a block in which the cylinder 41 is installed or included, so that the oil tank 10 and the cylinder 41 can be directly coupled to remove the conventional drain pipe.

즉, 실린더블록(40)에는 오일탱크(10)와 직접체결 할 경우 실린더(41)에서 오일탱크(10)로 이어지는 드레인 유로(43)가 형성되며, 상기 드레인 유로(43)의 단부에 직접체결 된 오일탱크(10)가 연결된다. That is, when the cylinder block 40 is directly fastened with the oil tank 10, a drain flow path 43 is formed from the cylinder 41 to the oil tank 10, and is directly fastened to an end of the drain flow path 43. The oil tank 10 is connected.

따라서 실린더(41)에서 차단기의 개폐작업을 수행한 오일은 드레인 유로(43)를 통해 오일탱크(10)로 드레인 된다. Therefore, the oil in which the opening and closing operation of the circuit breaker in the cylinder 41 is drained to the oil tank 10 through the drain flow passage 43.

그리고 실린더블록(40)에는 펌프(21)가 구비된 펌프블록(20)이 내부에 설치되며, 펌프블록(20)이 오일탱크(10)에서 축압장치(30)로 펌핑 할 수 있도록 공급유로(42)를 형성한다. In addition, the cylinder block 40 has a pump block 20 having a pump 21 installed therein, and a supply flow path for allowing the pump block 20 to pump from the oil tank 10 to the accumulator 30. 42).

이때 펌프블록(20)은 오일탱크(10)와 일체화 되게 구성하여 펌프블록(20)을 실린더블록(40)에 직접 체결되게 마련될 수 있으며, 이때 오일탱크(10)와 펌프블록(20)이 각각 드레인 유로(43)와 공급유로(42)에 직접 연결된다. In this case, the pump block 20 may be configured to be integrated with the oil tank 10 so that the pump block 20 may be directly connected to the cylinder block 40. In this case, the oil tank 10 and the pump block 20 may be provided. Each is directly connected to the drain flow path 43 and the supply flow path 42.

또한, 축압장치(30)가 실린더블록(40)의 일측에 결합하여 펌핑된 오일이 축압장치(30)를 거쳐 축압된 오일이 실린더(41)로 공급될 수 있도록 마련된다. In addition, the accumulator 30 is coupled to one side of the cylinder block 40 so that the pumped oil may be supplied to the cylinder 41 through the accumulator 30.

따라서 종래의 드레인파이프 및 공급파이프를 제거할 수 있음으로 상기 파이프 양측 단부에 의한 2개의 연결부위를 직접연결로 하나의 연결부위로 줄일 수 있음으로 누유의 위험을 줄일 수 있다. Therefore, the conventional drain pipe and the supply pipe can be removed, thereby reducing the risk of leakage by reducing the two connection parts by the direct connection to one connection part by both ends of the pipe.

이때 축압장치(30)와 실린더블록(40) 사이 또는 실린더블록(40)과 오일탱 크(10) 사이에는 누유를 방지할 수 있게 미도시한 패킹들이 포함될 수 있다. In this case, packings not shown may be included between the accumulator 30 and the cylinder block 40 or between the cylinder block 40 and the oil tank 10 to prevent leakage.

이하 본 발명의 일실시예에 따른 초고압 차단기용 파이프레스 유압 구동장치(100)의 작용을 도 2를 참조하여 설명한다. Hereinafter, the operation of the ultra-high pressure breaker pipeless hydraulic drive device 100 according to an embodiment of the present invention will be described with reference to FIG. 2.

먼저 오일탱크(10)의 오일을 펌프(21)를 구비한 펌프블록(20)에 구동하여 오일을 축압장치(30)로 이동시킨다. 이때 축압장치(30)로의 이송은 공급유로(42)를 통해 축압장치(30)로 이송되며, 이송된 오일은 충분히 축압되어 실린더(41)를 구동한다. First, the oil in the oil tank 10 is driven to the pump block 20 having the pump 21 to move the oil to the accumulator 30. At this time, the transfer to the accumulator 30 is transferred to the accumulator 30 through the supply flow path 42, the conveyed oil is sufficiently accumulate to drive the cylinder 41.

그리고 축압된 오일에 의해 실린더(41)가 구동함으로서 고전압 차단기를 개폐시킨다. 이때 개폐시 발생되는 오일은 드레인 유로(43)를 통해 직접 오일탱크(10)로 드레인 된다.The cylinder 41 is driven by the accumulated oil to open and close the high voltage breaker. At this time, the oil generated during opening and closing is directly drained to the oil tank 10 through the drain passage 43.

이상에서 본 발명의 초고압 차단기용 파이프레스 유압 구동장치에 대한 기술사상을 첨부도면과 함께 서술하였지만, 이는 본 발명의 가장 양호한 실시 예를 예시적으로 설명한 것이지 본 발명을 한정하는 것은 아니다. Although the technical idea of the pipeless hydraulic drive device for an ultra-high pressure circuit breaker of the present invention has been described with the accompanying drawings, this is by way of example and not by way of limitation of the present invention.

따라서 이 기술분야의 통상의 지식을 가진 자이면 누구나 본 발명의 기술사상의 범위를 이탈하지 않는 범위 내에서 치수 및 모양 그리고 구조 등의 다양한 변형 및 모방할 수 있음은 명백한 사실이며 이러한 변형 및 모방은 본 발명의 기술 사상의 범위에 포함된다. Accordingly, it is a matter of course that various modifications and variations of the present invention are possible without departing from the scope of the present invention. And are included in the technical scope of the present invention.

도 1은 종래의 초고압 차단기용 유압 구동장치를 보인 구성도.1 is a block diagram showing a conventional hydraulic drive device for a high voltage circuit breaker.

도 2는 본 발명의 일실시예에 따른 초고압 차단기용 파이프레스 유압 구동장치를 보인 구성도.Figure 2 is a block diagram showing a pipeless hydraulic drive device for an ultra-high pressure breaker according to an embodiment of the present invention.

< 도면의 주요부분에 대한 부호의 설명 >Description of the Related Art

100: 구동장치 10: 오일탱크100: drive device 10: oil tank

20: 펌프블록 21: 펌프20: pump block 21: pump

30: 축압장치 40: 실린더블록30: accumulator 40: cylinder block

41: 실린더 42: 공급유로41: cylinder 42: supply flow path

43: 드레인 유로43: drain flow path

Claims (4)

오일탱크에서 축압장치로 오일을 공급하는 펌프모듈과, 축압장치에서 공급된 오일을 실린더를 거쳐 오일탱크로 드레인되도록 한 유압구동장치에 있어서,In the pump module for supplying oil from the oil tank to the accumulator, and the hydraulic drive device to drain the oil supplied from the accumulator to the oil tank through the cylinder, 상기 실린더는 오일탱크와 직접 체결하여 실린더의 오일을 오일탱크에 직접 드레인시킬 수 있도록 드레인 유로를 갖는 실린더블록을 포함하고,The cylinder includes a cylinder block having a drain flow path to be directly coupled to the oil tank to drain the oil of the cylinder directly to the oil tank, 상기 실린더블록의 내부에는 상기 오일탱크에서 축압장치로 오일이 공급될 수 있게 공급유로를 포함하며, 상기 실린더블록에는 상기 축압장치가 직접 체결되고, 상기 축압장치는 상기 공급유로와 연결되는 것을 특징으로 하는 초고압 차단기용 파이프레스 유압 구동장치.The cylinder block includes a supply passage so that oil can be supplied from the oil tank to the accumulator, wherein the accumulator is directly coupled to the cylinder block, and the accumulator is connected to the supply passage. Pipeless hydraulic drive for ultra high voltage breakers. 제1항에 있어서, 상기 공급유로상에는 축압장치로 오일을 공급하는 펌프블록을 포함하는 것을 특징으로 하는 초고압 차단기용 파이프레스 유압 구동장치.The pipeless hydraulic drive device according to claim 1, further comprising a pump block for supplying oil to the accumulator on the supply passage. 삭제delete 제1항에 있어서, The method of claim 1, 상기 펌프모듈은 상기 오일탱크를 일체화 시키는 펌프블록을 포함하며, The pump module includes a pump block for integrating the oil tank, 상기 펌프블록은 상기 실린더블록에 직접체결 되어 드레인 유로와 오일탱크가 연결되는 것을 특징으로 하는 초고압 차단기용 파이프레스 유압 구동장치. The pump block is directly connected to the cylinder block is a high pressure circuit breaker hydraulic drive device, characterized in that the drain flow path and the oil tank is connected.
KR1020070106000A 2007-10-22 2007-10-22 The pipeless hydraulic drive mechanism for high voltage gis KR101155600B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101322220B1 (en) 2013-08-26 2013-10-28 우남전력 ㈜ High voltage line breaking system based on an dual electronic valve for prevention delay

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH044501U (en) * 1990-04-27 1992-01-16
JPH10299645A (en) 1997-04-28 1998-11-10 Shimadzu Corp Hydraulic unit
JPH11188555A (en) * 1997-10-20 1999-07-13 Kayaba Ind Co Ltd Tool changing device for machine tool
JP2007057053A (en) * 2005-08-26 2007-03-08 Toyooki Kogyo Co Ltd Hydraulic device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH044501U (en) * 1990-04-27 1992-01-16
JPH10299645A (en) 1997-04-28 1998-11-10 Shimadzu Corp Hydraulic unit
JPH11188555A (en) * 1997-10-20 1999-07-13 Kayaba Ind Co Ltd Tool changing device for machine tool
JP2007057053A (en) * 2005-08-26 2007-03-08 Toyooki Kogyo Co Ltd Hydraulic device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101322220B1 (en) 2013-08-26 2013-10-28 우남전력 ㈜ High voltage line breaking system based on an dual electronic valve for prevention delay

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