KR100674430B1 - Apparatus for supplying lubrication to the hydraulic breaker - Google Patents

Apparatus for supplying lubrication to the hydraulic breaker Download PDF

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Publication number
KR100674430B1
KR100674430B1 KR1020050102132A KR20050102132A KR100674430B1 KR 100674430 B1 KR100674430 B1 KR 100674430B1 KR 1020050102132 A KR1020050102132 A KR 1020050102132A KR 20050102132 A KR20050102132 A KR 20050102132A KR 100674430 B1 KR100674430 B1 KR 100674430B1
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South Korea
Prior art keywords
hydraulic
pumping
lubricating oil
passage
pumping piston
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KR1020050102132A
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Korean (ko)
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김병철
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금강테크 주식회사
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16N—LUBRICATING
    • F16N13/00—Lubricating-pumps
    • F16N13/02—Lubricating-pumps with reciprocating piston
    • F16N13/06—Actuation of lubricating-pumps
    • F16N13/16—Actuation of lubricating-pumps with fluid drive
    • 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
    • E02F3/96—Dredgers; Soil-shifting machines mechanically-driven with arrangements for alternate or simultaneous use of different digging elements
    • E02F3/966—Dredgers; Soil-shifting machines mechanically-driven with arrangements for alternate or simultaneous use of different digging elements of hammer-type tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D17/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D17/26—Lubricating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D17/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D17/26—Lubricating
    • B25D17/265—Lubricating the lubricant being entrained to the machine parts by the driving fluid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2222/00—Materials of the tool or the workpiece
    • B25D2222/72—Stone, rock or concrete

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)

Abstract

A lubricant supply device for a hydraulic breaker is provided to supply lubricant into a lubricant supply unit of a chisel periodically by hydraulic pressure in operating the hydraulic breaker, and to prevent malfunction by simply moving a pumping piston back and forth in a body block. A cavity(110) is formed in a body block(100), and a pumping piston is moved back and forth in the cavity. A pumping rod(210) is fitted to a lubricant pumping passage(120), and a lubricant supply passage(130) is formed in the body block and communicated with the lubricant pumping passage. A hydraulic supply passage(140) is connected to the cavity, and lubricant is discharged from the lubricant pumping passage by moving the pumping piston forward with hydraulic pressure from the hydraulic supply passage. A hydraulic discharge passage(150) is formed in the body block and communicated with the cavity. A spring(300) is mounted between an assembling part(230) of the pumping piston and an installation part(121) of the lubricant pumping passage, and the pumping piston is moved backward with restoring force of the spring in offsetting hydraulic pressure applied to the pumping piston by a switching spool(250). A stopper unit is formed between the cavity and the hydraulic supply passage.

Description

유압 브레이커용 윤활유공급장치{Apparatus for supplying lubrication to the hydraulic breaker}Lubricating oil supply device for hydraulic breaker {Apparatus for supplying lubrication to the hydraulic breaker}

도 1은 본 발명에 따른 유압 브레이커용 윤활유공급장치를 도시한 단면도1 is a cross-sectional view showing a lubricating oil supply device for a hydraulic breaker according to the present invention.

도 2는 도 1의 바디블록을 도시한 단면도2 is a cross-sectional view of the body block of FIG.

도 3은 도 1의 펌핑 피스톤과 절환 스풀을 도시한 분해 단면도3 is an exploded cross-sectional view showing the pumping piston and the switching spool of FIG.

도 4는 도 3의 펌핑 피스톤에 절환 스풀이 장착된 상태를 도시한 단면도4 is a cross-sectional view showing a state in which the switching spool is mounted on the pumping piston of FIG.

도 5는 유압 브레이커에 장착된 본 발명에 따른 윤활유공급장치의 유압 회로도5 is a hydraulic circuit diagram of a lubricating oil supply device according to the present invention mounted on a hydraulic breaker;

도 6 내지 도 9는 본 발명에 따른 유압 브레이커용 윤활유공급장치의 작동 상태도6 to 9 is an operating state of the hydraulic breaker supply device for a hydraulic breaker according to the present invention

대한민국 특허 제460985호(2004년 12월 1일 등록), 발명의 명칭 : 유압 브레이커를 위한 윤활유 자동공급장치Republic of Korea Patent No. 460985 (registered Dec. 1, 2004), Title of the invention: Automatic supply of lubricant for hydraulic breakers

본 발명은 유압 브레이커의 치즐부위로 그리스 등의 윤활유를 공급하는 유압 브레이커용 윤활유공급장치에 관한 것으로서, 보다 상세하게는 바디블록의 내부에 펌핑 피스톤이 전후진 가능하게 내장되고, 유압공급통로를 통해 공급되는 유압에 의해 펌핑 피스톤이 공간부에서 전진되므로서, 윤활유 펌핑통로에 채워진 윤활유가 펌핑 피스톤의 펌핑 로드부에 의해 가압되어 상기 윤활유 펌핑통로에서 토출되고, 상기 펌핑 피스톤에 장착된 절환스풀의 작용에 의해 펌핑 피스톤에 가해지는 유압이 상쇄되면, 펌핑 피스톤이 전진할 때 압축되었던 스프링의 복원력에 의해 펌핑 피스톤이 원위치로 후진되는 유압 브레이커용 윤활유공급장치에 관한 것이다.The present invention relates to a lubricating oil supply device for a hydraulic breaker for supplying lubricating oil, such as grease, to the chisel portion of the hydraulic breaker, and more particularly, the pumping piston is built in the body block to be able to move forward and backward, and through the hydraulic supply passage As the pumping piston is advanced in the space by the supplied hydraulic pressure, the lubricating oil filled in the lubricating oil pumping passage is pressurized by the pumping rod portion of the pumping piston to be discharged from the lubricating oil pumping passage, and the action of the switching spool mounted on the pumping piston When the hydraulic pressure applied to the pumping piston is canceled by, the lubricating oil supply device for the hydraulic breaker that the pumping piston is retracted to its original position by the restoring force of the spring that was compressed when the pumping piston is advanced.

대한민국 특허 제460985호(2004년 12월 1일 등록)에 "유압 브레이커를 위한 윤활유 자동공급장치"가 소개되어 있다.Republic of Korea Patent No. 460985 (registered December 1, 2004) is introduced "lubricating oil automatic supply device for hydraulic breakers".

상기 유압 브레이커를 위한 윤활유 자동공급장치는 유압브레이커에 부착되어 브레이커의 작동횟수에 따라 윤활유를 자동으로 공급하기 위하여 윤활유 펌프와 윤활유 충진통을 포함하여 이루어지는 것에 있어서, 상기 윤활유 펌프는 브레이커의 매회 타격 때마다 발생되는 진동에 의해 상하왕복운동을 하도록 브레이커의 진동에 따라 상하 왕복운동을 하는 진동볼과 이 진동볼의 상,하부에 배치되는 진동스프링1과 진동스프링2를 포함하여 이루어지는 입력수단과; 상기 입력수단의 상하 왕복운동을 회전운동으로 전환하고 이 회전운동을 다시 직선왕복운동으로 전환하여 윤활유를 펌핑하도록 상기 진동볼의 상하왕복운동을 소정각도의 왕복회전운동으로 전환하고 힘을 증폭하는 토션바와, 이 토션바의 회전력을 한쪽방향으로만 전달하기 위한 클러치베어링1 및 클러치베어링2와, 상기 클러치베어링1,2에 의해 일방향으로 회전하는 펌핑샤프트와, 이 펌핑샤프트의 회전력으로 왕복운동하면서 주기적으로 윤활유를 펌핑하는 펌핑피스톤과, 윤활유의 일방향 흐름만 조성하는 체크밸브와, 토출된 윤활유를 필요개소와 호스로 연결하는 니쁠과, 이들을 수용하는 펌핑블록을 포함하는 펌핑수단으로 이루어지는 것을 특징으로 한다.The automatic lubricant supply device for the hydraulic breaker is attached to the hydraulic breaker and comprises a lubricant pump and a lubricant filling cylinder to automatically supply the lubricant in accordance with the frequency of operation of the breaker, the lubricant pump when each breaker of the breaker An input means including a vibrating ball for up and down reciprocating motion according to the vibration of the breaker and a vibrating spring 1 and a vibrating spring 2 disposed above and below the vibrating ball so as to perform up and down reciprocation by the vibration generated every time; Torsion for converting the vertical reciprocating motion of the input means into a rotary motion and converting the rotary motion back to a linear reciprocating motion to convert the vertical reciprocating motion of the vibrating ball into a reciprocating rotational motion of a predetermined angle and amplifying the force to pump the lubricant. The clutch bearing 1 and the clutch bearing 2 for transmitting the rotational force of the torsion bar only in one direction, the pumping shaft rotated in one direction by the clutch bearings 1 and 2, and reciprocating by the rotational force of the pumping shaft periodically A pumping piston for pumping lubricating oil, a check valve for forming only one-way flow of lubricating oil, a nipple for connecting the discharged lubricating oil to a necessary place and a hose, and pumping means including a pumping block for accommodating them. .

그러나, 상기와 같이 구성된 종래의 유압 브레이커를 위한 윤활유 자동공급장치는 입력수단의 상하 왕복운동을 회전운동으로 전환시키고, 다시 회전운동을 직선왕복운동으로 전환시켜 펌핑 피스톤을 작동시키기 때문에, 이에 필요한 진동볼, 토션바, 클러치 베어링 등 구성요소가 많이 요구되고, 구성이 복잡하여 고장의 위험이 높으며, 제품생산비용이 많이 소요되는 단점이 있다.However, since the automatic supply of lubricating oil for the conventional hydraulic breaker configured as described above converts the up and down reciprocating motion of the input means into the rotational motion, and converts the rotational motion into the linear reciprocating motion again to operate the pumping piston, thus requiring vibration. Components such as balls, torsion bars, clutch bearings are required a lot, the complexity of the configuration is high, there is a high risk of failure, the production cost is high.

따라서, 본 발명의 목적은 바디블록의 내부에 펌핑 피스톤이 전후진 가능하게 내장되고, 유압공급통로를 통해 공급되는 유압에 의해 펌핑 피스톤이 공간부에서 전진되므로서, 윤활유 펌핑통로에 채워진 윤활유가 펌핑 피스톤의 펌핑 로드부에 의해 가압되어 상기 윤활유 펌핑통로에서 토출되고, 상기 펌핑 피스톤에 장착된 절환스풀의 작용에 의해 펌핑 피스톤에 가해지는 유압이 상쇄되면, 펌핑 피스톤이 전진할 때 압축되었던 스프링의 복원력에 의해 펌핑 피스톤이 원위치로 후진되므로서, 유압 브레이커의 유압을 이용하여 유압 브레이커가 작동할 때 자동으로 윤활유를 유압 브레이커로 지속적으로 공급할 수 있고, 윤활유의 주입주기가 일정한 유압 브레이커용 윤활유공급장치를 제공하는 것이다.Accordingly, an object of the present invention is that the pumping piston is embedded in the body block so as to move forward and backward, the pumping piston is advanced in the space by the hydraulic pressure supplied through the hydraulic supply passage, so that the lubricating oil filled in the lubricating oil pumping passage is pumped When the pressure applied by the pumping rod of the piston is discharged from the lubricating oil pumping passage and the hydraulic pressure applied to the pumping piston is canceled by the action of the switching spool mounted on the pumping piston, the restoring force of the spring that was compressed when the pumping piston was advanced Since the pumping piston is retracted to its original position, it is possible to continuously supply lubricating oil to the hydraulic breaker automatically when the hydraulic breaker is operated by using the hydraulic pressure of the hydraulic breaker, and to supply a hydraulic breaker for the hydraulic breaker having a constant lubricating oil injection cycle. To provide.

상기와 같은 목적을 달성하기 위한 본 발명의 바람직한 실시예를 도면을 참조하여 상세하게 설명하기로 한다.Preferred embodiments of the present invention for achieving the above object will be described in detail with reference to the drawings.

도 1을 참조하면, 본 발명에 따른 유압 브레이커용 윤활유공급장치(1)는 바디블록(100)의 내부에 공간부(110)가 형성되고, 상기 공간부(110)에 펌핑 피스톤(200)이 전후진 가능하게 배치되고, 상기 펌핑 피스톤(200)의 핌핑 로드부(210)가 윤활유 펌핑통로(120)에 끼워지고, 상기 윤활유 펌핑통로(120)와 소통되도록 윤활유 공급통로(130)가 바디블록(100)에 형성되고, 바디블록(100)에 형성되는 유압공급통로(140)가 공간부(110)에 연결되어, 상기 유압공급통로(140)를 통해 공급되는 유압에 의해 펌핑 피스톤(200)이 공간부(110)에서 화살표(310) 방향으로 전진되므로서, 윤활유 펌핑통로(120)에 채워진 윤활유가 펌핑 피스톤(200)의 펌핑 로드부(210)에 의해 가압되어 상기 윤활유 펌핑통로(120)에서 토출되고, 상기 공간부(110)와 연결되는 유압토출통로(150)가 바디블록(100)에 형성되고, 상기 펌핑 피스톤(210)의 견착부(230)와 윤활유 펌핑통로(120)의 선단 둘레에 형성되는 장착부(121) 사이에 스프링(300)이 배치되어, 상기 펌핑 피스톤(200)에 장착된 절환스풀(250)의 작용에 의해 펌핑 피스톤(200)에 가해지는 유압이 상쇄되면, 펌핑 피스톤(200)이 화살표(310) 방향으로 전진할 때 압축되었던 스프링(300)의 복원력에 의해 펌핑 피스톤(200)이 화살표(310) 반대방향으로 후진된다.Referring to FIG. 1, the hydraulic breaker lubricating oil supply device 1 according to the present invention has a space 110 formed in the body block 100, and a pumping piston 200 is formed in the space 110. Is disposed so as to move forward and backward, the pimping rod portion 210 of the pumping piston 200 is fitted into the lubricating oil pumping passage 120, the lubricating oil supply passage 130 is in communication with the lubricating oil pumping passage 120 The hydraulic supply passage 140 is formed in the 100, the body block 100 is connected to the space 110, the pumping piston 200 by the hydraulic pressure supplied through the hydraulic supply passage 140 The lubricant oil filled in the lubricating oil pumping passage 120 is pressurized by the pumping rod portion 210 of the pumping piston 200 by being advanced in the direction of the arrow 310 in the space 110 and the lubricating oil pumping passage 120. Is discharged from, and the hydraulic discharge passage 150 is connected to the space 110 is formed in the body block 100 A spring 300 is disposed between the attachment portion 230 of the pumping piston 210 and the mounting portion 121 formed around the front end of the lubricating oil pumping passage 120 to switch mounted on the pumping piston 200. When the hydraulic pressure applied to the pumping piston 200 is canceled by the action of the spool 250, the pumping piston 200 is driven by the restoring force of the spring 300 that was compressed when the pumping piston 200 advanced in the direction of the arrow 310. ) Is reversed in the opposite direction to arrow 310.

도 2를 참조하면, 상기 바디블록(100)은 공간부(110)와 유압공급통로(140) 사이에 스톱퍼부(150)가 형성되어, 스프링(300)에 의해 도 1의 화살표(310) 반대방향으로 후진되는 펌핑 피스톤(200 ; 도 1 참조)이 상기 스톱퍼부(150)에 의해 정지 된다. Referring to FIG. 2, the body block 100 has a stopper portion 150 formed between the space portion 110 and the hydraulic supply passage 140, and is opposite to the arrow 310 of FIG. 1 by the spring 300. The pumping piston 200 (refer to FIG. 1) which is retracted in the direction is stopped by the stopper part 150.

또한, 상기 바디블록(100)은 윤활유 펌핑통로(120)의 출구에 제 1 체크밸브(CV1)가 장착되고, 윤활유 공급통로(130)의 입구에 제 2 체크밸브(CV2)가 장착되고, 유압공급통로(140)의 입구에 유량조절장치(320)가 장착되고, 유압토출통로(150)의 출구에 제 3 체크밸브(CV3)가 장착된다.In addition, the body block 100 is equipped with a first check valve CV1 at the outlet of the lubricating oil pumping passage 120, a second check valve CV2 at the inlet of the lubricating oil supply passage 130, and hydraulic pressure. The flow rate controller 320 is mounted at the inlet of the supply passage 140, and the third check valve CV3 is mounted at the outlet of the hydraulic discharge passage 150.

상기 바디블록(100)의 공간부(110)는 전방 슬라이딩 공간부(111), 확장부(112) 및 후방 슬라이딩 공간부(113)로 구성되며, 전방 슬라이딩 공간부(111)와 후방 슬라이딩 공간부(113) 사이에 확장부(112)가 형성되어, 유압공급통로(140)를 통해 공간부(110)의 후방 슬라이딩 공간부(113)로 유입되는 유압이 펌핑 피스톤(200 ; 도 1 참조)을 전진시키고, 상기 펌핑 피스톤(200)이 전진되면, 상기 유압이 후방 슬라이딩 공간부(113)에서 확장부(112)로 공급된다.The space part 110 of the body block 100 includes a front sliding space 111, an expansion part 112, and a rear sliding space 113, and a front sliding space 111 and a rear sliding space. Expansion portion 112 is formed between the 113, the hydraulic pressure flowing into the rear sliding space 113 of the space portion 110 through the hydraulic supply passage 140 to pump the piston (200; see FIG. 1). When the pumping piston 200 is advanced, the hydraulic pressure is supplied from the rear sliding space 113 to the expansion part 112.

상기 후방 슬라이딩부(113)에는 실링패킹(114)이 장착되어 펌핑 피스톤(200 ; 도 1 참조)이 후진되어 상기 후방 슬라이딩 공간부(113)에 위치되었을 때, 상기 실링패킹(114)은 유압이 후방 슬라이딩 공간부(113)에서 확장부(112)로 누출되는 것을 방지한다.When the sealing piston 114 is mounted to the rear sliding part 113 and the pumping piston 200 is backward and positioned in the rear sliding space 113, the sealing packing 114 is hydraulically inclined. Leakage from the rear sliding space 113 to the expansion part 112 is prevented.

도 3을 참조하면, 상기 펌핑 피스톤(200)은 바디블록(100 ; 도 1 참조)의 공간부(110 ; 도 1 참조)에서 전후진 운동을 하는 바디부(220)와, 상기 바디부(220)에 일체로 형성되어 바디블록(100)의 윤활유 펌핑통로(120 ; 도 1 참조)에 끼워지는 펌핑 로드부(210)로 구성되고, 상기 바디부(220)에 형성된 중공부(221)에 절환스풀(250)이 장착되어, 상기 절환스풀(250)이 상기 중공부(221)에서 화살표(330) 방향으로 전후진될 수 있으며, 상기 바디부(220)에서 절환스풀(250)을 후진시키기 위한 유압이 공급되는 유압공급구멍(222)이 바디부(200)의 외주면에서 중공부(221)까지 형성되고, 상기 바디부(220)에 유압배출구멍(225)이 형성된다.Referring to FIG. 3, the pumping piston 200 may include a body part 220 that moves forward and backward in the space part 110 (see FIG. 1) of the body block 100 (see FIG. 1), and the body part 220. ) Is formed integrally with the pumping rod portion 210 is inserted into the lubricating oil pumping passage (120; see FIG. 1) of the body block 100, switching to the hollow portion 221 formed in the body portion 220 Spool 250 is mounted, the switching spool 250 may be advanced back and forth in the direction of the arrow 330 in the hollow portion 221, to reverse the switching spool 250 in the body portion 220 A hydraulic pressure supply hole 222 through which hydraulic pressure is supplied is formed from the outer circumferential surface of the body portion 200 to the hollow portion 221, and a hydraulic discharge hole 225 is formed in the body portion 220.

또한, 상기 펌핑 피스톤(200)은 견착부(230) 후방의 바디부(220)에 실링 패킹(240)이 장착되어, 펌핑 피스톤(200)이 전진되어 바디블록(100)의 공간부(110)의 전방 슬라이딩 공간부(111)에 위치되었을 때, 상기 확장부(112)의 유압이 전방 슬라이딩 공간부(111)를 통해 바디블록(100)의 유압토출통로(150)로 누출되는 것을 방지한다.In addition, the pumping piston 200 is a sealing packing 240 is mounted on the body portion 220 behind the shoulder portion 230, the pumping piston 200 is advanced to the space portion 110 of the body block 100 When positioned in the front sliding space 111 of the, the hydraulic pressure of the expansion portion 112 is prevented from leaking into the hydraulic discharge passage 150 of the body block 100 through the front sliding space 111.

도 3 및 도 4를 참조하면, 상기 절환스풀(250)은 전진 가압부(251), 목부(252) 및 후진 가압부(253)가 일체로 형성되고, 상기 목부(252)가 전진 가압부(251)와 후진 가압부(253) 사이에 배치되고, 유압을 받는 상기 후진 가압부(253)의 가압면적이 전진 가압부(251)의 가압면적 보다 크게 형성되므로서, 펌핑 피스톤(200)의 유압공급구멍(222)을 통해 유압이 펌핑 피스톤(200)의 중공부(221)로 공급되면, 전진 가압부(251)에 걸리는 전압력 보다 후진 가압부(253)에 걸리는 전압력이 크게 되어, 절환스풀(250)이 화살표(340) 방향으로 후진하게 되어, 목부(252)가 펌핑 피스톤(200)의 중공부(221)의 스로틀부(223)에 배치된다.3 and 4, the switching spool 250 includes a forward presser 251, a neck 252, and a reverse presser 253 integrally formed, and the neck 252 is a forward presser ( 251 is disposed between the reverse pressurizing unit 253 and the pressure area of the reverse pressurizing unit 253 subjected to the hydraulic pressure is larger than the pressing area of the forward pressurizing unit 251, so that the hydraulic pressure of the pumping piston 200 is increased. When the hydraulic pressure is supplied to the hollow portion 221 of the pumping piston 200 through the supply hole 222, the voltage force applied to the reverse pressurization portion 253 becomes greater than the voltage force applied to the forward pressurization portion 251, and the switching spool ( 250 is reversed in the direction of the arrow 340, so that the neck 252 is disposed in the throttle portion 223 of the hollow portion 221 of the pumping piston 200.

상기 후진 가압부(251)의 가압면적과 후진 가압부(253)의 가압면적은 2:3의 비율을 갖는 것이 바람직하다.Preferably, the pressing area of the reverse pressing unit 251 and the pressing area of the reverse pressing unit 253 have a ratio of 2: 3.

또한, 상기 중공부(221)의 스로틀부(223)의 직경(d)은 절환스풀(250)의 목부(252)의 직경(D1) 보다 크고, 절환스풀(250)의 전진 가압부(251)의 직경(D2)의 직 경과 일치되어, 절환스풀(250)의 목부(252)가, 도 4에 도시된 바와같이, 상기 스로틀부(223)에 배치되었을 때, 상기 목부(252)와 스로틀부(223) 사이에 간극(227)이 형성되므로서, 바디블록(100 ; 도 1 참조)의 공간부(110)의 후방 슬라이딩 공간부(113)로 공급된 유압이 상기 간극(227)을 통해 펌핑 피스톤(200)의 유압배출구멍(225)으로 배출될 수 있다. In addition, the diameter (d) of the throttle portion 223 of the hollow portion 221 is larger than the diameter (D1) of the neck portion 252 of the switching spool 250, the forward pressing portion 251 of the switching spool 250 The neck portion 252 and the throttle portion when the neck portion 252 of the switching spool 250 is disposed on the throttle portion 223 as shown in FIG. Since the gap 227 is formed between the 223, the hydraulic pressure supplied to the rear sliding space 113 of the space 110 of the body block 100 (see FIG. 1) is pumped through the gap 227. It may be discharged to the hydraulic discharge hole 225 of the piston (200).

이것에 의해, 도 1 및 도 4에 도시된 바와같이, 절환스풀(250)의 목부(252)가 상기 스로틀부(223)에 배치되었을 때, 상기 목부(252)와 스로틀부(223) 사이에 간극(227)이 형성되므로서, 바디블록(100)의 공간부(110)의 후방 슬라이딩 공간부(113)로 공급된 유압이 상기 간극(227)을 통해 펌핑 피스톤(200)의 유압배출구멍(225)으로 배출되어, 바디블록(100)의 공간부(110)의 후방 슬라이딩 공간부(113)의 압력과 바디블록(100)의 공간부(110)의 전방 슬라이딩 공간부(111)의 압력이 같아짐으로서, 펌핑 피스톤(200)에 가해지는 유압이 상쇄되어, 압축되었던 스프링(300)의 복원력에 의해 펌핑 피스톤(200)이 후진된다.Thus, as shown in FIGS. 1 and 4, when the neck 252 of the switching spool 250 is disposed in the throttle portion 223, between the neck 252 and the throttle portion 223. Since the gap 227 is formed, the hydraulic pressure supplied to the rear sliding space 113 of the space 110 of the body block 100 passes through the hydraulic outlet hole of the pumping piston 200 through the gap 227. 225, the pressure of the rear sliding space 113 of the space 110 of the body block 100 and the pressure of the front sliding space 111 of the space 110 of the body block 100 By being equal, the hydraulic pressure applied to the pumping piston 200 is canceled so that the pumping piston 200 is reversed by the restoring force of the spring 300 which has been compressed.

도 5를 참조하면, 상기와 같이 구성된 본 발명에 따른 유압 브레이커용 윤활유공급장치(1)는 치즐(410)을 타격하는 피스톤(430)의 실린더(420)를 포함하는 유압 브레이커(400)에 장착되고, 유압공급통로(140)가 제 1 연결라인(L1)에 의해 상기 유압 브레이커(400)의 실린더(420)와 연결되고, 유압배출통로(150)가 제 2 연결라인(L2)에 의해 유압 브레이커(400)의 유압공급원(440)과 연결되고, 윤활유 펌핑통로(120)가 제 3 연결라인(L3)에 의해 치즐(410)의 윤활유 공급부(411)와 연결되고, 상기 윤활유 공급통로(130)가 제 4 연결라인(L4)에 의해 윤활유 저장용기(450) 와 연결된다.Referring to Figure 5, the hydraulic breaker lubricating oil supply device 1 according to the present invention configured as described above is mounted on a hydraulic breaker 400 including a cylinder 420 of the piston 430 striking the chisel 410. The hydraulic supply passage 140 is connected to the cylinder 420 of the hydraulic breaker 400 by the first connection line L1, and the hydraulic discharge passage 150 is hydraulically connected by the second connection line L2. It is connected to the hydraulic supply source 440 of the breaker 400, the lubricating oil pumping passage 120 is connected to the lubricating oil supply portion 411 of the chisel 410 by a third connection line (L3), the lubricating oil supply passage 130 ) Is connected to the lubricant storage container 450 by the fourth connection line (L4).

이것에 의해, 도 5 및 도 6에 도시된 바와같이, 제 1 연결라인(L1)을 통해 유압 브레이커(400)의 실린더(420)에서 바디블록(100)의 유압공급통로(140)로 유압이 공급되면, 상기 유압이 바디블록(100)의 공간부(110)에 배치되어 스프링(300)에 의해 탄성적으로 지지된 펌핑 피스톤(200)을 화살표(350) 방향으로 밀게 된다. 이때, 윤활유 펌핑통로(120)에 채워져 있는 윤활유가 펌핑 피스톤(200)의 펌핑 로드부(210)로 부터 가압되기 시작한다.As a result, as shown in FIGS. 5 and 6, the hydraulic pressure is transferred from the cylinder 420 of the hydraulic breaker 400 to the hydraulic supply passage 140 of the body block 100 through the first connection line L1. When supplied, the hydraulic pressure is disposed in the space 110 of the body block 100 to push the pumping piston 200 elastically supported by the spring 300 in the direction of the arrow 350. At this time, the lubricating oil filled in the lubricating oil pumping passage 120 starts to be pressurized from the pumping rod part 210 of the pumping piston 200.

이후, 도 7에 도시된 바와같이, 상기 유압에 의해 펌핑 피스톤(200)이 화살표(350) 방향으로 전진하면서, 상기 펌핑 피스톤(200)의 펌핑 로드부(210)가 윤활유 펌핑통로(120)에 채워진 윤활유를 밀어냄으로서, 윤활유가 제 3 연결라인(L3)를 통해 치즐(410)의 윤활유 공급부(411)로 공급된다. 이때, 스프링(300)이 압축되고, 펌핑 피스톤(200)이 바디블록(100)의 장착부(121)에 걸려 전진운동이 정지되고, 상기 바디블록(100)의 후방 슬라이딩 공간부(111)로 공급되는 유압이 확장부(112)로 공급되므로서, 상기 유압이 펌핑 피스톤(200)의 유압공급구멍(222)으로 유입되어, 상기 절환스풀(250)의 후진 가압부(253)를 가압하게 된다. Subsequently, as shown in FIG. 7, while the pumping piston 200 is advanced in the direction of the arrow 350 by the hydraulic pressure, the pumping rod 210 of the pumping piston 200 enters the lubricating oil pumping passage 120. By pushing the filled lubricant, the lubricant is supplied to the lubricant supply part 411 of the chisel 410 through the third connection line (L3). At this time, the spring 300 is compressed, the pumping piston 200 is caught by the mounting portion 121 of the body block 100, the forward movement is stopped, and supplied to the rear sliding space 111 of the body block 100. As the hydraulic pressure is supplied to the expansion part 112, the hydraulic pressure flows into the hydraulic pressure supply hole 222 of the pumping piston 200 to pressurize the reverse pressing part 253 of the switching spool 250.

이후, 도 8에 도시된 바와같이, 절환스풀(250)의 후진 가압부(253)의 가압 면적이 전진 가압부(251)의 가압면적 보다 크게 형성되어 있어, 전진 가압부(251)에 걸리는 전압력 보다 후진 가압부(253)에 걸리는 전압력이 크기 때문에, 절환스풀(250)이 화살표(340) 방향으로 후진되어, 목부(252)가 펌핑 피스톤(200)의 중공부(221)의 스로틀부(223)에 배치된다. 이것에 의해, 유압이 상기 목부(252)와 스로 틀부(223) 사이에 간극(227)을 통해 펌핑 피스톤(200)의 유압배출구멍(222)으로 배출되므로서, 바디블록(100)의 후방 슬라이딩 공간부(113)의 압력과 바디블록(100)의 공간부(110)의 전방 슬라이딩 공간부(111)의 압력이 같아지게 되어, 펌핑 피스톤(200)에 가해지는 유압력이 상쇄된다.Subsequently, as shown in FIG. 8, the pressing area of the reverse pressing unit 253 of the switching spool 250 is formed larger than the pressing area of the forward pressing unit 251, and thus the voltage force applied to the forward pressing unit 251. Since the voltage force applied to the reverse pressing portion 253 is greater, the switching spool 250 is reversed in the direction of the arrow 340, so that the neck portion 252 is the throttle portion 223 of the hollow portion 221 of the pumping piston 200. ) Is placed. As a result, the hydraulic pressure is discharged to the hydraulic discharge hole 222 of the pumping piston 200 through the gap 227 between the neck portion 252 and the throttle portion 223, thereby sliding the rear of the body block 100. The pressure of the space 113 and the pressure of the front sliding space 111 of the space 110 of the body block 100 are equal, so that the hydraulic force applied to the pumping piston 200 is canceled.

도 9를 참조하면, 상기와 같이 펌핑 피스톤(200)에 가해지는 유압력이 상쇄되면, 압축되었던 스프링(300)의 복원력에 의해 펌핑 피스톤(200)이 도 6의 원위치로 후진되어 1사이클의 작동이 완료된다. 그리고, 바디블록(100)의 스톱퍼부(150)에 절환스풀(250)이 먼저 접하게 되므로서, 절환스풀(250)이 스톱퍼부(150)의 반발력에 의해 후진하는 펌핑 피스톤(250)의 중공부(221)로 삽입된다. 이때, 상기 펌핑 피스톤(200)의 중공부(221)에 채워진 유체가 펌핑 피스톤(200)의 유압배출구멍(222)을 통해 바디블록(100)의 전진 슬라이딩 공간부(111)로 배출되고, 다시 바디블록(100)의 유압토출통로(150)를 통해 유압 브레이커(400)의 유압 공급원(440)으로 배출된다. 또한, 펌핑 피스톤(200)의 펌핑 로드부(210)가 후진되면, 제 1 체크밸브(CV1)가 윤활유 펌핑통로(120)를 막고 있어, 제 3 라인(L3)을 통해 윤활유가 역류되지 않아, 윤활유 펌핑통로(120)가 진공상태가 되고, 이를 채우기 위해 제 2 체크밸브(CV2)가 개방되면서 윤활유 저장용기(450)의 윤활유가 상기 윤활유 펌핑통로(120)로 공급된다.Referring to FIG. 9, when the hydraulic force applied to the pumping piston 200 is canceled as described above, the pumping piston 200 is retracted to the original position of FIG. 6 by the restoring force of the spring 300 that has been compressed to operate one cycle. Is complete. And, since the switching spool 250 is first in contact with the stopper portion 150 of the body block 100, the hollow portion of the pumping piston 250, the switching spool 250 is reversed by the repulsive force of the stopper portion 150 221 is inserted. At this time, the fluid filled in the hollow portion 221 of the pumping piston 200 is discharged to the forward sliding space 111 of the body block 100 through the hydraulic discharge hole 222 of the pumping piston 200, again It is discharged to the hydraulic supply source 440 of the hydraulic breaker 400 through the hydraulic discharge passage 150 of the body block 100. In addition, when the pumping rod part 210 of the pumping piston 200 is reversed, the first check valve CV1 blocks the lubricating oil pumping passage 120, so that the lubricating oil does not flow back through the third line L3, The lubricating oil pumping passage 120 is in a vacuum state, and the second check valve CV2 is opened to fill the lubricating oil of the lubricating oil storage container 450, and is supplied to the lubricating oil pumping passage 120.

위에서 설명한 바와같이, 본 발명에 따른 유압 브레이커용 윤활유 공급장치는 유압 브레이커를 구동하는 유압에 의해 작동되므로서, 유압 브레이커가 작동할 때 동시에 작동되며, 유압 브레이커의 작동과정에서 윤활유를 치즐의 윤활유 공급부로 주기적으로 공급할 수 있고, 펌핑 피스톤 및 절환스풀에 의해 윤활유의 주입시간이 조절되고, 유압과 스프링의 작용에 의해 펌핑 피스톤이 바디블록에서 전후진하는 단순한 구조로 되어 있어, 고장이 적고 저렴한 효과가 있다.As described above, the lubricating oil supply device for the hydraulic breaker according to the present invention is operated by the hydraulic pressure driving the hydraulic breaker, so that it is operated simultaneously when the hydraulic breaker is operating, the lubricating oil supply portion of the chisel in the operation of the hydraulic breaker The pumping piston and the switching spool adjust the injection time of the lubricating oil, and the pumping piston moves forward and backward in the body block by the action of hydraulic pressure and spring. have.

Claims (9)

바디블록(100)의 내부에 공간부(110)가 형성되고, 상기 공간부(110)에 펌핑 피스톤(200)이 전후진 가능하게 배치되고, 상기 펌핑 피스톤(200)의 핌핑 로드부(210)가 윤활유 펌핑통로(120)에 끼워지고, 상기 윤활유 펌핑통로(120)와 소통되도록 윤활유 공급통로(130)가 바디블록(100)에 형성되고, 바디블록(100)에 형성되는 유압공급통로(140)가 공간부(110)에 연결되어, 상기 유압공급통로(140)를 통해 공급되는 유압에 의해 펌핑 피스톤(200)이 공간부(110)에서 전진되므로서, 윤활유 펌핑통로(120)에 채워진 윤활유가 펌핑 피스톤(200)의 펌핑 로드부(210)에 의해 가압되어 상기 윤활유 펌핑통로(120)에서 토출되고, 상기 공간부(110)와 연결되는 유압토출통로(150)가 바디블록(100)에 형성되고, 상기 펌핑 피스톤(210)의 견착부(230)와 윤활유 펌핑통로(120)의 선단 둘레에 형성되는 장착부(121) 사이에 스프링(300)이 배치되어, 상기 펌핑 피스톤(200)에 장착된 절환스풀(250)의 작용에 의해 펌핑 피스톤(200)에 가해지는 유압이 상쇄되면, 펌핑 피스톤(200)이 전진할 때 압축되었던 스프링(300)의 복원력에 의해 펌핑 피스톤(200)이 후진되는 것을 특징으로 하는 유압 브레이커용 윤활유공급장치.The space 110 is formed inside the body block 100, and the pumping piston 200 is disposed in the space 110 so as to be able to move forward and backward, and the pumping rod 210 of the pumping piston 200 is provided. Is inserted into the lubricating oil pumping passage 120, the lubricating oil supply passage 130 is formed in the body block 100 so as to communicate with the lubricating oil pumping passage 120, and the hydraulic supply passage 140 formed in the body block 100. ) Is connected to the space 110, the pumping piston 200 is advanced in the space 110 by the hydraulic pressure supplied through the hydraulic supply passage 140, the lubricating oil filled in the lubricating oil pumping passage 120 Is pressurized by the pumping rod portion 210 of the pumping piston 200 is discharged from the lubricating oil pumping passage 120, the hydraulic discharge passage 150 is connected to the space portion 110 to the body block 100 Is formed, the mounting is formed around the front end of the adherent portion 230 and the lubricating oil pumping passage 120 of the pumping piston 210 When the spring 300 is disposed between the 121 and the hydraulic pressure applied to the pumping piston 200 by the action of the switching spool 250 mounted on the pumping piston 200 is canceled, the pumping piston 200 is Lubricating oil supply device for a hydraulic breaker, characterized in that the pumping piston 200 is reversed by the restoring force of the spring 300, which was compressed when moving forward. 제 1 항에 있어서,The method of claim 1, 상기 바디블록(100)은 공간부(110)와 유압공급통로(140) 사이에 스톱퍼부 (150)가 형성되는 것을 특징으로 하는 유압 브레이커용 윤활유공급장치. The body block 100 is a hydraulic breaker lubricating oil supply device, characterized in that the stopper portion 150 is formed between the space 110 and the hydraulic supply passage 140. 제 1 항에 있어서,The method of claim 1, 상기 바디블록(100)은 윤활유 펌핑통로(120)의 출구에 제 1 체크밸브(CV1)가 장착되고, 윤활유 공급통로(130)의 입구에 제 2 체크밸브(CV2)가 장착되고, 유압공급통로(140)의 입구에 유량조절장치(320)가 장착되고, 유압토출통로(150)의 출구에 제 3 체크밸브(CV3)가 장착되는 것을 특징으로 하는 유압 브레이커용 윤활유공급장치.The body block 100 is equipped with a first check valve CV1 at the outlet of the lubricating oil pumping passage 120, a second check valve CV2 at the inlet of the lubricating oil supply passage 130, and a hydraulic supply passage. A flow rate control device (320) is installed at the inlet of the 140, and a third check valve (CV3) is mounted to the outlet of the hydraulic discharge passage 150, characterized in that the hydraulic breaker supply device for a hydraulic breaker. 제 1 항에 있어서,The method of claim 1, 상기 바디블록(100)의 공간부(110)는 전방 슬라이딩 공간부(111), 확장부(112) 및 후방 슬라이딩 공간부(113)로 구성되고, 상기 후방 슬라이딩부(113)에 실링패킹(114)이 장착되는 것을 특징으로 하는 유압 브레이커용 윤활유공급장치.The space part 110 of the body block 100 includes a front sliding space 111, an expansion part 112, and a rear sliding space 113, and a sealing packing 114 on the rear sliding part 113. ) Is a lubricant supply device for a hydraulic breaker, characterized in that the mounting. 제 1 항에 있어서,The method of claim 1, 상기 펌핑 피스톤(200)은 바디블록(100)의 공간부(110)에서 전후진 운동을 하는 바디부(220)와, 상기 바디부(220)에 일체로 형성되어 바디블록(100)의 윤활유 펌핑통로(120)에 끼워지는 펌핑 로드부(210)로 구성되고, 상기 바디부(220)에 형성된 중공부(221)에 절환스풀(250)이 장착되어, 상기 절환스풀(250)이 상기 중공부(221)에서 전후진될 수 있으며, 상기 바디부(220)에서 절환스풀(250)을 후진시키기 위한 유압이 공급되는 유압공급구멍(222)이 바디부(200)의 외주면에서 중공부(221)까지 형성되고, 상기 바디부(220)에 유압배출구멍(225)이 형성되는 것을 특징으로 하는 유압 브레이커용 윤활유공급장치.The pumping piston 200 is formed integrally with the body 220 and the body 220 to move forward and backward in the space 110 of the body block 100, the pumping lubricant of the body block 100 Consists of a pumping rod portion 210 fitted to the passage 120, the switching spool 250 is mounted to the hollow portion 221 formed in the body portion 220, the switching spool 250 is the hollow portion 221 may be moved back and forth, the hydraulic supply hole 222 is supplied with the hydraulic pressure for the reverse to the switching spool 250 in the body portion 220 hollow portion 221 on the outer peripheral surface of the body portion 200 Is formed to, the hydraulic breaker lubricating oil supply device, characterized in that the hydraulic discharge hole 225 is formed in the body portion 220. 제 5 항에 있어서,The method of claim 5, 상기 펌핑 피스톤(200)은 견착부(230) 후방의 바디부(220)에 실링 패킹(240)이 장착되는 것을 특징으로 하는 유압 브레이커용 윤활유공급장치.The pumping piston 200 is a hydraulic breaker lubricating oil supply device, characterized in that the sealing packing 240 is mounted on the body portion 220 of the rear attachment portion 230. 제 1 항 또는 제 5 항에 있어서,The method according to claim 1 or 5, 상기 절환스풀(250)은 전진 가압부(251), 목부(252) 및 후진 가압부(253)가 일체로 형성되고, 상기 목부(252)가 전진 가압부(251)와 후진 가압부(253) 사이에 배치되고, 유압을 받는 상기 후진 가압부(253)의 가압면적이 전진 가압부(251)의 가압면적 보다 크게 형성되므로서, 펌핑 피스톤(200)의 유압공급구멍(222)을 통해 유압이 펌핑 피스톤(200)의 중공부(221)로 공급되면, 전진 가압부(251)에 걸리는 전압력 보다 후진 가압부(253)에 걸리는 전압력이 크게 되어, 절환스풀(250)이 화 살표(340) 방향으로 후진하게 되어, 목부(252)가 펌핑 피스톤(200)의 중공부(221)의 스로틀부(223)에 배치되는 것을 특징으로 하는 유압 브레이커용 윤활유공급장치.The switching spool 250 has a forward pressing portion 251, a neck 252 and a reverse pressing portion 253 integrally formed, and the neck 252 has a forward pressing portion 251 and a backward pressing portion 253. The pressure area of the reverse pressurizing unit 253 disposed between and receiving hydraulic pressure is larger than that of the forward pressurizing unit 251, so that the hydraulic pressure is supplied through the hydraulic supply hole 222 of the pumping piston 200. When supplied to the hollow portion 221 of the pumping piston 200, the voltage force applied to the reverse pressurization portion 253 is greater than the voltage force applied to the forward pressurization portion 251, so that the switching spool 250 moves in the direction of the arrow 340. It is to be reversed, the neck portion 252 is a hydraulic breaker lubricant supply device, characterized in that disposed in the throttle portion 223 of the hollow portion 221 of the pumping piston (200). 제 7 항에 있어서,The method of claim 7, wherein 상기 중공부(221)의 스로틀부(223)의 직경(d)은 절환스풀(250)의 목부(252)의 직경(D1) 보다 크고, 절환스풀(250)의 전진 가압부(251)의 직경(D2)의 직경과 일치되어, 절환스풀(250)의 목부(252)가, 도 4에 도시된 바와같이, 상기 스로틀부(223)에 배치되었을 때, 상기 목부(252)와 스로틀부(223) 사이에 간극(227)이 형성되므로서, 바디블록(100)의 공간부(110)의 후방 슬라이딩 공간부(113)로 공급된 유압이 상기 간극(227)을 통해 펌핑 피스톤(200)의 유압배출구멍(225)으로 배출되는 것을 특징으로 하는 유압 브레이커용 윤활유공급장치.The diameter d of the throttle portion 223 of the hollow portion 221 is larger than the diameter D1 of the neck portion 252 of the switching spool 250, and the diameter of the forward pressing portion 251 of the switching spool 250. The neck 252 and the throttle part 223 when the neck part 252 of the switching spool 250 is arrange | positioned to the throttle part 223 as shown in FIG. 4 in accordance with the diameter of (D2). Since the gap 227 is formed between the two, the hydraulic pressure supplied to the rear sliding space 113 of the space 110 of the body block 100 is the hydraulic pressure of the pumping piston 200 through the gap 227. Lubricating oil supply device for a hydraulic breaker, characterized in that discharged to the discharge hole (225). 제 1 항에 있어서,The method of claim 1, 상기 유압공급통로(140)가 제 1 연결라인(L1)에 의해 유압 브레이커(400)의 실린더(420)와 연결되고, 유압배출통로(150)가 제 2 연결라인(L2)에 의해 유압 브레이커(400)의 유압공급원(440)과 연결되고, 윤활유 펌핑통로(120)가 제 3 연결라인(L3)에 의해 치즐(410)의 윤활유 공급부(411)와 연결되고, 상기 윤활유 공급통로 (130)가 제 4 연결라인(L4)에 의해 윤활유 저장용기(450)와 연결되는 것을 특징으로 하는 유압 브레이커용 윤활유공급장치.The hydraulic supply passage 140 is connected to the cylinder 420 of the hydraulic breaker 400 by the first connection line (L1), the hydraulic discharge passage 150 is the hydraulic breaker (2) by the second connection line (L2) It is connected to the hydraulic supply source 440 of 400, the lubricating oil pumping passage 120 is connected to the lubricating oil supply portion 411 of the chisel 410 by a third connecting line (L3), the lubricating oil supply passage 130 Lubricating oil supply device for a hydraulic breaker, characterized in that connected to the lubricating oil storage container 450 by the fourth connecting line (L4).
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KR100908218B1 (en) * 2009-02-27 2009-07-20 (주)아벡스 Automatic lubricant supply hydraulic breaker
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EP3795752A4 (en) * 2018-05-18 2022-02-23 Soosan Heavy Industries Co., Ltd. Hydraulic breaker provided with automatic lubricant supply structure
KR102539482B1 (en) * 2022-01-07 2023-06-02 주식회사 이지지오텍 Under reaming apparatus and under reamed pile construction method using the same
KR102541013B1 (en) * 2022-01-18 2023-06-13 주식회사 이지지오텍 Under reaming apparatus and under reamed pile construction method using the same
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WO2010098557A2 (en) * 2009-02-27 2010-09-02 (주)아벡스 Hydraulic breaker with automatic grease supply
WO2010098557A3 (en) * 2009-02-27 2010-11-18 (주)아벡스 Hydraulic breaker with automatic grease supply
KR101797659B1 (en) * 2016-06-20 2017-11-15 윤여송 Equipment and control method for auto supplying lubrication oil, and hydraulic breaker having equipment for auto supplying lubrication oil
KR101903357B1 (en) 2017-05-12 2018-11-13 주식회사수산중공업 A hydraulic breaker with a auto lubrication structure
WO2018207963A1 (en) * 2017-05-12 2018-11-15 주식회사수산중공업 Hydraulic breaker having embedded automatic lubricating oil supply structure
EP3795752A4 (en) * 2018-05-18 2022-02-23 Soosan Heavy Industries Co., Ltd. Hydraulic breaker provided with automatic lubricant supply structure
EP4234172A3 (en) * 2018-05-18 2023-10-25 Soosan Heavy Industries Co., Ltd. Hydraulic breaker provided with automatic lubricant supply structure
KR102356585B1 (en) * 2021-03-16 2022-02-08 주식회사 이지지오텍 Under reaming apparatus and under reamed pile construction method using the same
KR102539482B1 (en) * 2022-01-07 2023-06-02 주식회사 이지지오텍 Under reaming apparatus and under reamed pile construction method using the same
KR102541013B1 (en) * 2022-01-18 2023-06-13 주식회사 이지지오텍 Under reaming apparatus and under reamed pile construction method using the same
WO2024085329A1 (en) * 2022-10-20 2024-04-25 주식회사수산중공업 Hydraulic breaker provided with directly connected lubricating oil automatic supply block

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