KR20120102905A - Liquid Transfer Pump Using Gear Pump - Google Patents

Liquid Transfer Pump Using Gear Pump Download PDF

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Publication number
KR20120102905A
KR20120102905A KR1020110020792A KR20110020792A KR20120102905A KR 20120102905 A KR20120102905 A KR 20120102905A KR 1020110020792 A KR1020110020792 A KR 1020110020792A KR 20110020792 A KR20110020792 A KR 20110020792A KR 20120102905 A KR20120102905 A KR 20120102905A
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KR
South Korea
Prior art keywords
cylinder
piston
gear pump
pump
oil
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KR1020110020792A
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Korean (ko)
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이준형
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이준형
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Priority to KR1020110020792A priority Critical patent/KR20120102905A/en
Publication of KR20120102905A publication Critical patent/KR20120102905A/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
    • F04B9/08—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid
    • F04B9/10—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid
    • F04B9/103—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having only one pumping chamber
    • F04B9/105—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having only one pumping chamber reciprocating movement of the pumping member being obtained by a double-acting liquid motor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
    • F04B17/03—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B23/00—Pumping installations or systems
    • F04B23/02—Pumping installations or systems having reservoirs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/14—Pistons, piston-rods or piston-rod connections
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2210/00—Working fluid
    • F05B2210/10—Kind or type
    • F05B2210/11—Kind or type liquid, i.e. incompressible
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2260/00—Function
    • F05B2260/60—Fluid transfer
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S417/00—Pumps

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)

Abstract

PURPOSE: A liquid transfer pump using a gear pump is provided to compress liquid sucked to the inside a second cylinder with high-pressure using hydraulic pressure generated in a small gear pump. CONSTITUTION: A liquid transfer pump using a gear pump comprises a gear pump(22), a first cylinder(25), a first piston(27), a second cylinder(34), a closing pipe(36), a second piston(35), an intake check valve(32), and an exhaust check valve(33). The gear pump pumps oil(24) stored in an oil tank(23). The first cylinder is vertically installed on one side of the gear pump. The first piston ascends and descends a piston rod(26) when the pumped oil is supplied. The second cylinder compresses gas at the top of the first cylinder. The closing pipe closes the bottom of the second cylinder and discharges air from the second cylinder to the outside. The second piston is fixed to the piston rod located inside the second cylinder and compresses fluid.

Description

기어펌프를 이용한 액체 이송펌프{omitted}Liquid transfer pump using gear pump

본 발명은 물, 오일 등의 액체를 이송하는 액체 이송펌프에 관한 것으로써, 좀더 구체적으로는 소형 기어펌프에서 발생된 유압을 이용하여 액체를 고압으로 압축하여 높은 곳으로 압송하는 기어펌프를 이용한 액체 이송펌프에 관한 것이다.The present invention relates to a liquid transfer pump for transferring a liquid such as water, oil, and more specifically, a liquid using a gear pump for compressing the liquid to a high pressure by using a hydraulic pressure generated from a small gear pump and pumping it to a high place. It relates to a transfer pump.

일반적으로, 액체를 이송하기 위한 유체 이송펌프는 그 동력원을 모터에 의존하고 있는 실정이다.In general, a fluid transfer pump for delivering a liquid depends on a motor for its power source.

예를 들어, 모터의 로테이터 회전동력을 이용하여 임펠러를 회전시킴으로써 액체를 이송시킬 수 있도록 하고 있거나, 모터의 로테이터와 크랭크에 연결된 피스톤이 실린더의 내부에서 왕복운동을 할 때, 체크밸브가 교대로 열리고 닫히는 작동에 의하여 액체를 이송시킬 수 있도록 하고 있다.For example, by using the rotator rotational power of the motor to rotate the impeller to transfer the liquid, or when the piston connected to the motor's rotator and the crank reciprocates inside the cylinder, the check valve opens alternately The closing operation allows the liquid to be transported.

그러나, 이러한 유체 이송펌프들은 기본적으로 모터를 설치하여야 하는 것이어서 압송을 위한 에너지 효율이 저하될 수밖에 없어 부득이 유체를 높은 곳으로 압송하고자 할 경우에는 대용량의 유압펌프를 사용하거나, 여러 대의 유압펌프를 설치하여야 하는 문제점이 있었으며, 아울러 피스톤과 실린더를 이용하는 방식은 크랭크에 의하여 모터의 로테이터에 의한 원을 그리는 회전력이 왕복운동으로 변환되는 과정에서 소음이 발생될 뿐만 아니라 구조가 복잡하여 제작비용을 상승시키고 장치의 부피가 커지는 등의 문제점이 발생되었다.However, since these fluid transfer pumps basically require a motor to be installed, the energy efficiency for pumping is inevitably deteriorated. Therefore, in order to force the fluid to a high place, a large capacity hydraulic pump or multiple hydraulic pumps are installed. In addition, the method using the piston and the cylinder not only generates noise in the process of converting the rotational force by the crank rotator into the reciprocating motion by the crank, but also increases the manufacturing cost due to the complicated structure. Problems such as increasing the volume of the.

본 발명은 이와 같은 종래의 문제점을 해결하기 위해 안출한 것으로써, 대용량의 유압펌프 또는 유압펌프를 다단으로 설치하지 않고 소형 기어펌프에서 얻어진 고압으로 피스톤을 왕복 이동시킴에 따라 유체를 높은 곳으로 압송할 수 있도록 하는데 그 목적이 있다.The present invention has been made in order to solve such a conventional problem, and the pressure is pumped to a high place by reciprocating the piston at a high pressure obtained from a small gear pump without installing a large-capacity hydraulic pump or hydraulic pump in multiple stages The purpose is to make it possible.

상기 목적을 달성하기 위한 본 발명의 형태에 따르면, 오일탱크 내에 담겨진 오일을 모터의 구동으로 펌핑하는 기어펌프와, 상기 기어펌프의 일 측에 설치된 제1실린더와, 상기 제1실린더의 내부에 왕복 이동 가능하게 설치된 피스톤로드에 고정되어 각 포트에 연결된 연결관을 통해 솔레노이드밸브의 절환으로 기어펌프에서 펌핑된 오일이 공급됨에 따라 피스톤로드를 이동시키는 제1피스톤과, 상기 제1실린더의 일 측에 설치되는 제2실린더와, 상기 제2실린더의 개구부를 폐쇄함과 동시에 제2실린더의 내부에 있던 공기를 외부로 배출하는 공기통로를 갖는 폐쇄판과, 상기 제2실린더의 내부에 위치하는 피스톤로드에 고정되어 유체를 압축하는 제2피스톤과, 상기 제2실린더에 설치된 흡, 토출 체크밸브로 구성된 것을 특징으로 하는 기어펌프를 이용한 액체 이송펌프가 제공된다.According to an aspect of the present invention for achieving the above object, a gear pump for pumping oil contained in the oil tank by the drive of the motor, a first cylinder provided on one side of the gear pump, and reciprocating inside the first cylinder A first piston for moving the piston rod as the oil pumped from the gear pump by the switching of the solenoid valve through a connection pipe connected to each port fixed to the movable piston rod is installed, and on one side of the first cylinder A closing plate having a second cylinder to be installed, an air passage for closing the opening of the second cylinder and discharging air from the inside of the second cylinder to the outside, and a piston rod positioned inside the second cylinder. And a second piston configured to be fixed to the second piston to compress the fluid, and a suction and discharge check valve installed in the second cylinder. The material transfer pump is provided.

본 발명은 기어펌프에서 생성된 압력으로 제2실린더의 내부로 흡입된 유체를 높은 압력으로 압축하여 높은 곳까지 압송할 수 있게 됨은 물론 원하는 압송 높이에 따라 제2실린더 및 제2피스톤의 크기를 임의로 변경하여 적용할 수 있게 되므로 그 구조를 크게 변경하지 않고도 다양한 종류의 액체 이송펌프를 생산할 수 있게 되고, 이에 따라 액체 이송펌프를 저렴한 가격으로 널리 보급할 수 있는 효과를 얻게 된다.According to the present invention, the fluid sucked into the second cylinder by the pressure generated by the gear pump can be compressed at a high pressure to be pumped up to a high position, and the size of the second cylinder and the second piston can be arbitrarily selected according to the desired feeding height. Since the present invention can be changed and applied, it is possible to produce various kinds of liquid transfer pumps without greatly changing the structure thereof, thereby obtaining an effect of widely distributing the liquid transfer pumps at a low price.

도 1a 및 도 1b는 본 발명의 일 실시예를 나타낸 종단면도로써,
도 1a는 제2실린더의 내부에 유체를 흡입한 상태도
도 1b는 제2실린더에서 압축된 유체를 배출한 상태도1A and 1B are longitudinal cross-sectional views showing an embodiment of the present invention.
1A is a state in which the fluid is sucked into the second cylinder
Figure 1b is a state discharged from the compressed fluid in the second cylinder

이하, 본 발명을 일 실시예로 도시한 도 1을 참고하여 더욱 상세히 설명하면 다음과 같다.Hereinafter, described in more detail with reference to Figure 1 showing the present invention as an embodiment.

도 1a 및 도 1b는 본 발명의 일 실시예를 나타낸 종단면도로써, 본 발명은 모터(21)에 의해 기어펌프(22)가 구동함에 따라 상기 기어펌프가 오일탱크(23) 내에 담겨진 오일(24)을 펌핑하도록 되어 있고 상기 기어펌프(22)의 일 측에는 제1실린더(25)가 설치되어 있다.1A and 1B are longitudinal cross-sectional views showing an embodiment of the present invention. In the present invention, as the gear pump 22 is driven by the motor 21, the gear pump is contained in the oil tank 23. ) And a first cylinder 25 is installed at one side of the gear pump 22.

그리고 상기 제1실린더(25)의 내부에 피스톤로드(26)가 왕복 이동 가능하게 설치되어 있고 상기 피스톤로드의 일단에는 제1피스톤(27)이 고정되어 있어 제1실린더의 각 포트(28a)(28b)에 연결된 연결관(29a)(29b) 중 어느 하나의 연결관을 통해 솔레노이드밸브(30)의 절환으로 기어펌프(22)에서 펌핑된 오일(24)이 공급됨에 따라 피스톤로드(26)가 왕복 이동하게 된다.The piston rod 26 is installed inside the first cylinder 25 so as to reciprocate, and a first piston 27 is fixed to one end of the piston rod so that each port 28a of the first cylinder ( The piston rod 26 is supplied as the oil 24 pumped from the gear pump 22 is supplied to the switching of the solenoid valve 30 through one of the connecting pipes 29a and 29b connected to 28b). It will move back and forth.

또한, 상기 제1실린더(25)의 일 측에 흡, 토출 체크밸브(32)(33)를 구비하는 제2실린더(34)가 설치되어 있고 상기 제2실린더의 내부에 위치하는 피스톤로드(26)에는 제2피스톤(35)이 고정되어 있으며 상기 제2실린더(34)의 일 측 개구부는 공기통로(36a)가 형성된 폐쇄판(36)으로 폐쇄되어 있는데, 이 때 상기 폐쇄판(36)은 제2실린더(34)의 개구부는 물론 제1실린더(25)의 개구부도 함께 폐쇄하게 된다.In addition, a second cylinder (34) having suction and discharge check valves (32, 33) is provided on one side of the first cylinder (25), and a piston rod (26) located inside the second cylinder (26). The second piston 35 is fixed to the one side and the opening of one side of the second cylinder 34 is closed by a closing plate 36 formed with an air passage 36a, wherein the closing plate 36 is closed. The opening of the second cylinder 34 as well as the opening of the first cylinder 25 are also closed together.

도면 중 미설명 부호, (37)은 콘트롤 패널이고, (38)은 제1피스톤(27)의 외주면에 설치되는 오링이며, (39)는 폐쇄판(36)에 설치되는 오링이고, (40)은 제2피스톤(35)의 외주면에 고정된 피스톤 링이다.In the drawings, reference numeral 37 denotes a control panel, 38 denotes an O-ring provided on an outer circumferential surface of the first piston 27, 39 denotes an O-ring provided on a closing plate 36, and 40 Is a piston ring fixed to the outer circumferential surface of the second piston 35.

이와 같이 구성된 본 발명의 작용을 설명하면 다음과 같다.Hereinafter, the operation of the present invention will be described.

먼저, 도 1a와 같이 제1,2피스톤(27)(35)이 도면 상 우측에 위치된 상태에서는 흡입 체크밸브(32)를 통해 유체가 제2실린더(34)의 내부로 유입된 상태이다.First, in the state where the first and second pistons 27 and 35 are positioned on the right side of the drawing as shown in FIG. 1A, the fluid is introduced into the second cylinder 34 through the suction check valve 32.

이러한 상태에서 유입된 유체를 압축하기 위해 솔레노이드밸브(30)가 절환되어 기어펌프(22)의 구동으로 압축된 오일(24)이 연결관(29b) 및 포트(28b)를 통해 제1실린더(25)의 우측 내부로 유입되면 도면 상 우측에 위치되어 있던 제1피스톤(27)이 유입된 오일(24)의 압력에 의해 좌측으로 점차 이동하게 되고, 이에 따라 피스톤로드(26)에 고정되어 제2실린더(34)의 우측에 위치되어 있던 제2피스톤(35)도 도면 상 좌측으로 이동하면서 제2실린더(34)에 유입된 유체를 압축하게 된다.The solenoid valve 30 is switched to compress the fluid introduced in such a state, and the oil 24 compressed by the driving of the gear pump 22 is supplied to the first cylinder 25 through the connecting pipe 29b and the port 28b. When the first piston 27, which is located on the right side of the drawing, is gradually moved to the left side due to the pressure of the oil 24 introduced thereto, the piston is fixed to the piston rod 26 and thus the second piston 27 The second piston 35 positioned on the right side of the cylinder 34 also moves to the left side in the drawing to compress the fluid introduced into the second cylinder 34.

계속되는 피스톤로드(26)의 이동으로 제2피스톤(35)이 도 2b와 같이 도면 상 좌측으로 이동하여 제2실린더(34)의 내부에 있던 유체를 고압으로 압축시키고 나면 토출 체크밸브(33)가 개방되어 압축된 고압의 유체를 배출시키게 되므로 소정의 압력으로 압축된 고압의 유체를 높은 곳으로 압송할 수 있게 된다.Subsequent movement of the piston rod 26 causes the second piston 35 to move leftward in the drawing as shown in FIG. 2B to compress the fluid in the second cylinder 34 to a high pressure. Since the open and compressed high pressure fluid is discharged, the high pressure fluid compressed at a predetermined pressure can be pumped to a high place.

한편, 제2피스톤(35)이 도면 상 좌측으로 이동하여 제2실린더(34)에서 고압으로 압축된 유체를 배출한 다음 솔레노이드밸브(30)의 절환으로 기어펌프(22)에서 압축된 오일(24)이 또 다른 연결관(29a) 및 포트(28a)를 통해 제1실린더(25)의 좌측으로 유입되면 도면 상 좌측에 위치되어 있던 제1피스톤(27)이 최초의 위치인 도면 상 우측으로 이동하게 되므로 피스톤로드(26)에 고정되어 있던 제2피스톤(35)도 함께 우측으로 이동하게 된다.Meanwhile, the second piston 35 moves to the left in the drawing to discharge the fluid compressed at high pressure from the second cylinder 34, and then the oil 24 compressed in the gear pump 22 by switching of the solenoid valve 30. ) Flows into the left side of the first cylinder 25 through another connector 29a and port 28a, the first piston 27 located on the left side of the drawing moves to the right side of the drawing which is the first position. Therefore, the second piston 35 fixed to the piston rod 26 also moves to the right together.

이에 따라, 제2실린더(34)의 내부 압력이 떨어져 흡입 체크밸브(32)가 개방되므로 압송할 유체를 제2실린더(34)의 내부로 흡입하게 되는데, 상기 제2피스톤(35)이 도면 상 우측으로 이동 시 제2피스톤(35)의 우측에 존재하던 공기는 폐쇄판(36)에 형성된 공기통로(36a)를 통해 외부로 배출되므로 제2피스톤(35)의 원활한 이동이 가능해지게 되는 것이다.Accordingly, since the suction check valve 32 is opened due to a drop in the internal pressure of the second cylinder 34, the fluid to be pumped is sucked into the second cylinder 34, and the second piston 35 is shown in the drawing. Air existing on the right side of the second piston 35 when moved to the right is discharged to the outside through the air passage 36a formed in the closing plate 36, so that the smooth movement of the second piston 35 becomes possible.

본 발명의 기술사상은 상기한 바람직한 실시예에 따라 구체적으로 기술되었으나, 전술한 실시예들은 그 설명을 위한 것이며, 그 제한을 위한 것이 아님을 주의하여야 한다.Although the technical spirit of the present invention has been described in detail according to the above-described preferred embodiment, it should be noted that the above-described embodiments are for the purpose of description and not of limitation.

또한, 본 발명의 기술분야에서 통상의 전문가라면 본 발명의 기술사상의 범위 내에서 다양하게 변화하여 실시할 수 있음은 이해 가능한 것이다.In addition, it will be understood by those skilled in the art that various changes can be made within the scope of the technical idea of the present invention.

21 : 모터 22 : 기어펌프
23 : 오일탱크 25 : 제1실린더
26 : 피스톤로드 27 : 제1피스톤
28a, 28b : 포트 29a, 29b : 연결관
30 : 솔레노이드밸브 32 : 흡입 체크밸브
33 : 배기 체크밸브 34 : 제2실린더
35 : 제2피스톤 36 : 폐쇄판21: motor 22: gear pump
23: oil tank 25: the first cylinder
26: piston rod 27: first piston
28a, 28b: port 29a, 29b: connector
30: solenoid valve 32: suction check valve
33: exhaust check valve 34: second cylinder
35: second piston 36: closing plate

Claims (1)

오일탱크(23) 내에 담겨진 오일(24)을 모터(21)의 구동으로 펌핑하는 기어펌프(22)와, 상기 기어펌프의 일 측에 설치된 제1실린더(25)와, 상기 제1실린더의 내부에 왕복 이동 가능하게 설치된 피스톤로드(26)에 고정되어 각 포트(28a)(28b)에 연결된 연결관(29a)(29b)을 통해 솔레노이드밸브(30)의 절환으로 기어펌프(22)에서 펌핑된 오일(24)이 공급됨에 따라 피스톤로드(26)를 이동시키는 제1피스톤(27)과, 상기 제1실린더의 일 측에 설치되는 제2실린더(34)와, 상기 제2실린더의 개구부를 폐쇄함과 동시에 제2실린더의 내부에 있던 공기를 외부로 배출하는 공기통로(36a)를 갖는 폐쇄판(36)과, 상기 제2실린더의 내부에 위치하는 피스톤로드(25)에 고정되어 유체를 압축하는 제2피스톤(35)과, 상기 제2실린더에 설치된 흡, 토출 체크밸브(32)(33)로 구성된 것을 특징으로 하는 기어펌프를 이용한 액체 이송펌프.Gear pump 22 for pumping the oil 24 contained in the oil tank 23 by the drive of the motor 21, the first cylinder 25 provided on one side of the gear pump, and the interior of the first cylinder Pumped from the gear pump 22 by switching of the solenoid valve 30 through connecting pipes 29a and 29b connected to the respective ports 28a and 28b and fixed to the piston rods 26 reciprocally installed. The first piston 27 which moves the piston rod 26 as the oil 24 is supplied, the second cylinder 34 installed at one side of the first cylinder, and the opening of the second cylinder are closed. And a closing plate 36 having an air passage 36a for discharging air inside the second cylinder to the outside and a piston rod 25 located inside the second cylinder to compress the fluid. Gear comprising a second piston (35), and the suction and discharge check valves (32, 33) installed in the second cylinder Liquid transfer pump using pump.
KR1020110020792A 2011-03-09 2011-03-09 Liquid Transfer Pump Using Gear Pump KR20120102905A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101671829B1 (en) * 2015-07-06 2016-11-03 홍국선 Feeding Appatarus Having Gear Pump Unit and Combining Form Hydraulic Actuator Having the Same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101671829B1 (en) * 2015-07-06 2016-11-03 홍국선 Feeding Appatarus Having Gear Pump Unit and Combining Form Hydraulic Actuator Having the Same

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