KR100208398B1 - Actuator controlling outlet pressure of concrete - Google Patents

Actuator controlling outlet pressure of concrete Download PDF

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Publication number
KR100208398B1
KR100208398B1 KR1019970005327A KR19970005327A KR100208398B1 KR 100208398 B1 KR100208398 B1 KR 100208398B1 KR 1019970005327 A KR1019970005327 A KR 1019970005327A KR 19970005327 A KR19970005327 A KR 19970005327A KR 100208398 B1 KR100208398 B1 KR 100208398B1
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South Korea
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hydraulic
concrete
cylinders
oil
cylinder
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KR1019970005327A
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Korean (ko)
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KR19980068629A (en
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우근혁
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강순보
삼우중공업주식회사
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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
    • F04B15/00—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts
    • F04B15/02—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts the fluids being viscous or non-homogeneous
    • F04B15/023—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts the fluids being viscous or non-homogeneous supply of fluid to the pump by gravity through a hopper, e.g. without intake valve
    • 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
    • F04B53/141—Intermediate liquid piston between the driving piston and the pumped liquid
    • 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
    • F04B53/144—Adaptation of piston-rods
    • 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
    • F04B53/148—Pistons, piston-rods or piston-rod connections the piston being provided with channels which are coacting with the cylinder and are used as a distribution member for another piston-cylinder unit
    • 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
    • F04B53/162—Adaptations of cylinders
    • 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
    • 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
    • Y10S417/90—Slurry pumps, e.g. concrete

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)

Abstract

본 발명은 콘크리트 토출압 제어용 유압장치에 관한 것으로서, 제1 및 제2유압실린더에 오일탱크의 작동유를 토출시키는 가변형 유압펌프가 연결되고, 가변형유압펌프에 제1 및 제2유압실린더에 걸리는 과부하를 방지시킬 수 있도록 제3 및 제4유압실린더가 관로로 연결되며, 제3 및 제4유압실린더에서 토출되는 작동유의 방향을 변환시키는 방향제어밸브와, 제4유압실린더에 저장된 작동유를 오일탱크로 복귀시키는 과부하 감지밸브를 관로로 연결시킴으로써, 제1 및 제2콘크리트 실린더 입구부에 비교적 입자가 큰 자갈등이 끼워있거나 또는 기계적인 고장 발생시 제1 및 제2유압실린더 측으로 적은 압력의 유압을 토출시켜 펌프의 수명을 연장시킬 수 있고, 특히 피스톤의 펌핑작용을 지속적으로 수행시킴에 따라 제1 및 제2콘크리트 실린더내에 유입된 콘크리트의 응고를 방지할 수 있다.The present invention relates to a hydraulic device for controlling the concrete discharge pressure, the variable hydraulic pump for discharging the hydraulic oil of the oil tank is connected to the first and second hydraulic cylinder, the variable hydraulic pump to the overload applied to the first and second hydraulic cylinder The third and fourth hydraulic cylinders are connected to the pipeline so as to prevent them, and the direction control valve for changing the direction of the hydraulic oil discharged from the third and fourth hydraulic cylinders, and the hydraulic oil stored in the fourth hydraulic cylinder to return to the oil tank. By connecting the overload detection valve to the pipeline, the large particle gravel is inserted in the inlet of the first and second concrete cylinders or when there is a mechanical failure, the hydraulic pressure is discharged to the first and second hydraulic cylinders. Of the first and second concrete cylinders as a result of the continuous pumping action of the piston It can prevent the concrete from solidifying.

Description

콘크리트 토출압 제어용 유압장치Hydraulic device for concrete discharge pressure control

본 발명은 콘크리트 토출압 제어용 유압장치에 관한 것으로서, 더욱 상세하게는 콘크리트 실린더에 유입된 자갈 등의 이물질 또는 일시적인 기계고장 발생시 유압실린더로 공급되는 과부하를 방지시킴으로써, 작업의 지속성을 유지시킴은 물론 콘크리트 펌프의 수명을 연장시킬 수 있도록 한 콘크리트 토출압 제어용 유압장치에 관한 것이다.The present invention relates to a hydraulic device for controlling the concrete discharge pressure, and more particularly, by preventing foreign matter such as gravel introduced into the concrete cylinder or overload supplied to the hydraulic cylinder when a temporary mechanical failure occurs, thereby maintaining the durability of the work as well as concrete It relates to a hydraulic device for controlling the concrete discharge pressure to extend the life of the pump.

일반적으로, 모래 및 자갈 등과 함께 레미콘 차량(ready mixed concrete car)에서 믹싱(mixing)된 콘크리트를 수용하여 지상 또는 지하등 비교적 거리가 먼 장소로 콘크리트를 운반시키기 위한 교반장치는 제1도에 나타낸 바와같이, 대용량의 콘크리트를 수용하는 호퍼(10)가 구비되고, 호퍼(10) 일면에는 제1 및 제2토출홀(12a)(12b)을 갖는 토출판(12)이 부착되어 있으며, 제1 및 제2토출홀(12a)(12b) 사이에는 샤프트(도시되지 않음)가 회전 가능하게 관통되도록 관통홀이 형성된다.In general, an agitation device for accommodating concrete mixed in a ready mixed concrete car with sand and gravel and transporting the concrete to a relatively distant place such as the ground or the underground is shown in FIG. Similarly, a hopper 10 for accommodating a large amount of concrete is provided, and a discharge plate 12 having first and second discharge holes 12a and 12b is attached to one surface of the hopper 10. A through hole is formed between the second discharge holes 12a and 12b so that a shaft (not shown) is rotatably penetrated.

상기 샤프트 일단부에는 유압에 의해 이동하면서 제1 및 제2토출홀(12a)(12b)을 교대로 개폐시킬 수 있도록 교반실린더(14)의 로드(load) 일끝단이 결합되어 있고, 토출판(12) 후면에는 콘크리트를 수용한 후 외부로 토출시키기 위한 제1 및 제2콘트리트 실린더(16)(18)가 결합된다.One end of the rod of the stirring cylinder 14 is coupled to one end of the shaft to alternately open and close the first and second discharge holes 12a and 12b while moving by hydraulic pressure. 12) The first and second concrete cylinders 16 and 18 are coupled to the rear surface for accommodating the concrete and discharging them to the outside.

또한, 제1 및 제2콘트리트 실린더(16)(18)에는 상호 연결호스(20)로 연결된 제1 및 제2유압실린더(22)(24)가 결합되어 있으며, 제1 및 제2유압실린더(22)(24)내부에는 유압에 의해 직석왕복이동 가능한 가변형(variable type) 피스톤(26)이 내설되고, 피스톤(26)에는 제1 및 제2콘트리트 실린더(16)(18)내에 일부분을 각각 내설시킨 피스톤로드(28)가 고정된다. 그리고, 피스톤로드(28) 일끝에는 믹싱된 콘크리트를 흡입할 수 있도록 고무재질로 된 흡입부재(30)가 부착된다.In addition, the first and second concrete cylinders 16 and 18 are coupled to the first and second hydraulic cylinders 22 and 24 connected by an interconnecting hose 20, and the first and second hydraulic cylinders ( 22) (24) is provided with a variable type piston 26 which is capable of traveling reciprocally by hydraulic pressure, and a part of the piston 26 is installed inside the first and second concrete cylinders 16 and 18, respectively. Piston rod 28 is fixed. At one end of the piston rod 28, a suction member 30 made of rubber material is attached to suck the mixed concrete.

한편, 호퍼(10)의 다른 일면에는 제1콘크리트 실린더(16) 또는 제2콘크리트 실린더(18)에 수용된 콘크리트를 선택적으로 배출시킬 수 있도록 배출관(32)이 결합되며, 배출관(32) 일단부는 S자 형상의 트랜스퍼 튜브(34)가 연결되어 있고, 트랜스퍼 튜브(34)에는 샤프트의 회전운동에 따라 좌,우 방향으로 회전 가능한 지지대가 장착된다.On the other hand, the other side of the hopper 10 is coupled to the discharge pipe 32 to selectively discharge the concrete contained in the first concrete cylinder 16 or the second concrete cylinder 18, one end of the discharge pipe 32 The magnet-shaped transfer tube 34 is connected, the support tube is mounted to the transfer tube 34 is rotatable in the left and right directions according to the rotational movement of the shaft.

상기 제1 및 제2실린더에는 제2도에서와 같이 유압펌프(36)와 연결되어 오일탱크(38)에 저장된 작동유를 공급받기 위한 관로(40)가 연결되고, 제1유압실린더(22)에는 작동유의 방향을 변환시켜 제2유압실린더(24)측으로 공급할 수 있도록 일방향 체크밸브(42)가 연결되어 있으며, 오일탱크(36)에 연결된 관로에는 작동유의 역류를 방지하는 셔틀밸브(44)가 연결된다.The first and second cylinders are connected to the hydraulic pump 36 as shown in FIG. 2, and a conduit 40 for receiving hydraulic oil stored in the oil tank 38 is connected to the first hydraulic cylinder 22. One-way check valve 42 is connected to change the direction of the hydraulic oil to be supplied to the second hydraulic cylinder 24 side, the shuttle valve 44 is connected to the pipeline connected to the oil tank 36 to prevent the back flow of the hydraulic oil. do.

또한, 셔틀밸브(44)의 관로에는 최고 압력을 제한할 수 있도록 파일럿 작동형 릴리브 밸브(46)가 연결되며, 이 릴리브 밸브(46)에 유량을 제어하는 교축밸브(48)가 연결되어 있고, 교축밸브(48)에 작동유를 냉각시켜 오일탱크(36)로 저장시키는 냉각기(50)가 연결된다.In addition, a pilot operated relief valve 46 is connected to the pipeline of the shuttle valve 44 so as to limit the maximum pressure, and an throttling valve 48 for controlling the flow rate is connected to the relief valve 46. The cooler 50 is connected to the throttling valve 48 to cool the working oil and store the oil in the oil tank 36.

이와같이 구성된 교반장치에 장착된 피스톤을 펌핑시키기 위한 종래의 유압장치는, 레미콘에서 믹싱된 콘크리트를 호퍼(10) 내부에 수용시킨 상태에서 유압펌프(36)가 작동되면, 오일탱크(38)내에 저장된 작동유가 냉각기(50)를 거쳐 관로(40)를 따라 유량이 제어되면서 교축밸브(48)로 토출되고, 토출된 작동유는 셔틀밸브(44)를 따라 제1유압실린더(22) 또는 제2유압실린더(24) 중에서 어느 하나의 유압실린더에 유압을 제공한다.The conventional hydraulic device for pumping the piston mounted in the stirring device configured as described above is stored in the oil tank 38 when the hydraulic pump 36 is operated while the concrete mixed in the ready mixed concrete is accommodated in the hopper 10. The hydraulic oil is discharged to the throttle valve 48 while the flow rate is controlled along the conduit 40 through the cooler 50, and the discharged hydraulic oil is discharged from the first hydraulic cylinder 22 or the second hydraulic cylinder along the shuttle valve 44. Hydraulic pressure is provided to any one of the hydraulic cylinders (24).

즉, 제1유압실린더(22)측으로 유압이 제공되면 유압력에 의해 제1유압실린더(22)내에 내설된 피스톤(26)이 후방으로 이동한다.That is, when the hydraulic pressure is provided to the first hydraulic cylinder 22 side, the piston 26 built in the first hydraulic cylinder 22 is moved backward by the hydraulic pressure.

그후, 피스톤로드(28) 일끝에 부착된 흡입부재(30)가 피스톤(26)과 동일방향으로 이동하면서 진공상태를 유지시켜 제1유압실린더(22)와 결합된 제1콘크리트 실린더(16) 내부로 믹싱된 콘크리트 수용시킨다. 이때, 제1유압실린더(22)에 저장된 작동유는 일방향 체크밸브(42)를 따라 제2유압실린더(24)측으로 토출되어 제2유압실린더(24)의 피스톤(26)을 전진 이동시키면서 제2콘크리트 실린더(18) 내부로 콘크리트 유입을 방지시킨다.Subsequently, the suction member 30 attached to one end of the piston rod 28 moves in the same direction as the piston 26 to maintain a vacuum state, so that the inside of the first concrete cylinder 16 coupled with the first hydraulic cylinder 22 is maintained. Accept the mixed concrete. At this time, the hydraulic oil stored in the first hydraulic cylinder 22 is discharged to the second hydraulic cylinder 24 side along the one-way check valve 42 to move the piston 26 of the second hydraulic cylinder 24 forward while the second concrete Prevents concrete from entering the cylinder 18.

그리고, 제1유압실린더(22)내에 내설된 피스톤(26)의 이동이 완료되면 교반실린더(14)에 유압이 제공되어 트랜스퍼 튜브(34)와 제1토출홀(12a)이 연통되도록 한 상태에서 제2유압실린더(24)에 유압을 제공시킴에 따라 제1콘크리트 실린더(16)에 유입된 콘크리트는 제1유압실린더(16)에 내설된 피스톤(26)의 전진이동에 의해서 배출관(32)으로 토출된다.Then, when the movement of the piston 26 in the first hydraulic cylinder 22 is completed, the hydraulic pressure is provided to the stirring cylinder 14 so that the transfer tube 34 and the first discharge hole 12a communicate with each other. As the hydraulic pressure is supplied to the second hydraulic cylinder 24, the concrete introduced into the first concrete cylinder 16 is transferred to the discharge pipe 32 by the forward movement of the piston 26 installed in the first hydraulic cylinder 16. Discharged.

그러나, 이와같이 유압펌프에서 작동유를 제1 및 제2유압실린더 측으로 일정하게 토출시켰기 때문에 제1 및 제2콘크리트 실린더 입구부에 비교적 큰 입자의 자갈 등이 끼워 있거나 또는 일시적인 기계고장시 제1 및 제2유압실린더에 과부하가 걸려 펌프의 수명을 단축시킴을 물론 피스톤의 펌핑작용을 정지시킴에 따라서 작업시간이 지연될 뿐만 아니라, 제1 및 제2콘크리트 실린더내에 유입된 콘크리트가 응고되어 이를 분쇄시키기 위한 별도의 작업이 요구되는 문제점이 있었다.However, since the hydraulic oil is constantly discharged from the hydraulic pump to the first and second hydraulic cylinders, relatively large particles of gravel or the like are inserted into the first and second concrete cylinder inlets, or the first and second in case of temporary mechanical failure. The hydraulic cylinder is overloaded, which shortens the life of the pump and stops the pumping action of the piston, which delays the working time and separates the concrete introduced into the first and second concrete cylinders to solidify and grind it. There was a problem that requires the work of.

본 발명은 상기와 같은 문제점들을 해결하기 위한 것으로서, 본 발명은 오일탱크내에 저장된 작동유를 제1 및 제2유압실린더 측으로 토출시키는 가변형 유압펌프와, 상기 가변형 유압펌프에 관로로 연결되어 제1 및 제2유압실린더에 걸리는 과부하를 방지시키기 위해 가변형 유압펌프의 압력을 제어하는 제3 및 제4유압실린더와, 상기 제3 및 제4유압실린더에서 토출되는 작동유의 방향을 변환시키기 위한 방향제어밸브와, 상기 방향제어밸브에 관로로 연결되어 제4유압실린더에 저장된 작동유를 오일탱크로 복귀시키는 과부하 감지밸브를 포함하여 구성된 것에 의해 달성된다.The present invention is to solve the above problems, the present invention is a variable hydraulic pump for discharging the hydraulic fluid stored in the oil tank to the first and second hydraulic cylinder side, and the first and second connected to the variable hydraulic pump in the pipeline A third and fourth hydraulic cylinders for controlling the pressure of the variable hydraulic pump to prevent an overload on the hydraulic cylinder, a direction control valve for changing the direction of the hydraulic oil discharged from the third and fourth hydraulic cylinders, It is achieved by including an overload detection valve connected to the directional control valve in a pipeline to return the hydraulic oil stored in the fourth hydraulic cylinder to the oil tank.

제1도는 선행기술에 따라 콘크리트를 배출관으로 토출시키기 위한 교반장치를 나타낸 사시도.1 is a perspective view showing a stirring device for discharging concrete to the discharge pipe according to the prior art.

제2도는 제1도의 교반장치에 장착된 피스톤을 펌핑시키는 종래의 유압회로도.2 is a conventional hydraulic circuit diagram for pumping a piston mounted to the stirring apparatus of FIG.

제3도는 본 발명에 따른 콘크리트 토출압 제어용 유압장치를 나타낸 유압회로도이다.3 is a hydraulic circuit diagram showing a hydraulic apparatus for controlling concrete discharge pressure according to the present invention.

* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings

10 : 호퍼 12 : 토출판10: hopper 12: discharge plate

12a,12b : 제1 및 제2토출홀 14 : 교반실린더12a, 12b: first and second discharge hole 14: stirring cylinder

16,18 : 제1 및 제2콘크리트 실린더 20 : 연결호스16,18: 1st and 2nd concrete cylinder 20: connection hose

22,24 : 제1 및 제2유압실린더 26 : 피스톤22, 24: first and second hydraulic cylinder 26: piston

28 : 피스톤로드 30 : 흡입부재28: piston rod 30: suction member

32 : 배출관 34 : 트랜스퍼 튜브32: discharge pipe 34: transfer tube

36 : 유압펌프 38 : 오일탱크36: hydraulic pump 38: oil tank

40 : 관로 42 : 체크밸브40: pipeline 42: check valve

44 : 셔틀밸브 46 : 릴리프 밸브44: shuttle valve 46: relief valve

48 : 교축밸브 50 : 냉각기48: throttling valve 50: cooler

100 : 가변형 유압펌프 102 : 스프링100: variable hydraulic pump 102: spring

104,106 : 제3 및 제4유압실린더 108 : 방향제어밸브104,106: third and fourth hydraulic cylinders 108: directional control valves

110 : 과부하 감지밸브110: overload detection valve

이하, 본 발명에 따른 콘크리트 토출압 제어용 유압장치의 바람직한 일실시예를 첨부도면에 의거하여 상세하게 설명한다.Hereinafter, a preferred embodiment of the hydraulic device for controlling the concrete discharge pressure according to the present invention will be described in detail with reference to the accompanying drawings.

제3도는 본 발명에 따른 유압장치를 나타낸 회로도로서, 제1 및 제2유압실린더(16)(18)에 연결된 관로(40)에는 오일탱크(38)내에 저장된 작동유를 토출시킬 수 있도록 가변형 유압펌프(100)가 연결되며, 오일탱크(38)에 연결된 관로(40)에는 작동유의 역류를 방지시키기 위한 셔틀밸브(44)가 연결되어 있고, 셔틀밸브(44)에는 관로(40)를 따라 토출된 최고 압력을 제한할 수 있도록 릴리브 밸브(46)가 연결된다.3 is a circuit diagram showing a hydraulic apparatus according to the present invention, a variable hydraulic pump so as to discharge the hydraulic oil stored in the oil tank 38 in the pipeline 40 connected to the first and second hydraulic cylinders 16 and 18. 100 is connected, the shuttle 40 is connected to the pipeline 40 connected to the oil tank 38 to prevent the back flow of the working oil, the shuttle valve 44 is discharged along the pipeline 40 A relief valve 46 is connected to limit the maximum pressure.

또한, 릴리브 밸브(44)에 유량을 제어하는 교축밸브(48)가 연결되어 있으며, 가변형 유압펌프(100)에는 제1 및 제2유압실린더(16)(18)에 걸리는 과부하를 방지할 수 있도록 스프링(102)이 내설된 제3 및 제4유압실린더(104)(106)가 연결되어 있다. 그리고, 제3 및 제4유압실린더(104)(106)에는 스풀(spool)의 이동에 따라 제4유압실린더(106)에 토출된 작동유를 오일탱크(38)로 배출시키기 위한 방향제어밸브(108)가 연결되며, 방향제어밸브(108)에는 관로(40)에 의해 과부하 감지밸브(110)가 연결된다.In addition, a throttling valve 48 for controlling the flow rate is connected to the relief valve 44, and the variable hydraulic pump 100 can prevent the overload applied to the first and second hydraulic cylinders 16 and 18. The third and fourth hydraulic cylinders 104 and 106 having springs 102 installed therein are connected to each other. In addition, the third and fourth hydraulic cylinders 104 and 106 include a direction control valve 108 for discharging the hydraulic oil discharged to the fourth hydraulic cylinder 106 to the oil tank 38 according to the movement of the spool. ) Is connected, and the overload detection valve 110 is connected to the direction control valve 108 by the conduit 40.

상기와 같이 구성된 본 발명에 따른 콘크리트 토출압 제어용 유압장치의 작용을 상세하게 설명하면 다음과 같다.Referring to the operation of the hydraulic pressure control device for concrete discharge pressure according to the present invention configured as described above in detail.

콘크리트 차량에서 믹싱된 대용량의 콘크리트를 호프(10)에 수용시킨 다음 가변형 유압펌프(100)를 작동시키면, 오일탱크(38)에 저장된 작동유가 냉각기(50)를 거쳐 관로(40)를 따라 교축밸브(48)에 의해 유량이 제어되면서 토출됨과 동시에 셔틀밸브(44)를 따라 제1유압실린더(16) 또는 제2유압실린더(18) 중에서 어느 하나의 유압실린더 측으로 유압이 제공되어 피스톤(26)을 후방으로 이동시킨다.When a large amount of concrete mixed in a concrete vehicle is accommodated in the hop 10 and then the variable hydraulic pump 100 is operated, the hydraulic oil stored in the oil tank 38 passes through the cooler 50 along the conduit 40 through the throttle valve. At the same time as the flow rate is controlled by the pump 48, the hydraulic pressure is provided to the hydraulic cylinder side of the first hydraulic cylinder 16 or the second hydraulic cylinder 18 along the shuttle valve 44 to supply the piston 26. Move backward

그 후, 콘크리트 실린더에 흡입된 콘크리트는 배출관(32)을 통해 토출되고, 작동유는 일방향 체크밸브(42)를 따라 다른 유압실린더 측으로 토출되어 유압실린더에 내설된 피스톤(26)을 전진이동시키면서 콘크리트 실린더 내부로 콘크리트의 유입을 방지시킨다.Thereafter, the concrete sucked into the concrete cylinder is discharged through the discharge pipe 32, the working oil is discharged to the other hydraulic cylinder side along the one-way check valve 42, while moving the piston 26 built in the hydraulic cylinder to advance the concrete cylinder Prevents concrete from entering

이때, 제1 또는 제2콘크리트 실린더(22)(24) 입구부에 입도가 큰 자갈이나 또는 이물질이 걸려 피스톤(26)의 펌핑(pumping) 작용을 방해함에 따라 제1 및 제2유압실린더(16)(18)에 과부하가 발생되면, 방향제어밸브(108)의 스풀이 이동되면서 제4유압실린더(106)에 저장된 작동유가 과부하 감지밸브(110)를 거쳐 오일탱크(28)로 복귀됨에 따라서 제3유압실린더(104)측으로 작동유가 토출되어 제1 또는 제2유압실린더(16)(18)로 유압을 제공하는 가변형 유압펌프(100)의 압력이 제어되므로 제1 또는 제2유압실린더(16)(18)에 걸리는 과부하가 방지되는 것이다. 즉, 피스톤(26)의 펌핑작용을 계속적으로 수행시킬 수 있는 것이다.At this time, the first and second hydraulic cylinders (16) in the first or second concrete cylinders (22, 24) inlet portion is caught in the gravel or foreign matter of large particle size to interfere with the pumping (pumping) action of the piston 26 When 18) overload occurs, the spool of the direction control valve 108 is moved and the hydraulic oil stored in the fourth hydraulic cylinder 106 is returned to the oil tank 28 via the overload detection valve 110. Since the hydraulic oil is discharged to the hydraulic cylinder 104 side and the pressure of the variable hydraulic pump 100 providing hydraulic pressure to the first or second hydraulic cylinders 16 and 18 is controlled, the first or second hydraulic cylinders 16 are controlled. The overload on (18) is prevented. That is, the pumping action of the piston 26 can be continuously performed.

이상에서와 같이 본 발명에 따른 콘크리트 토출압 제어용 유압장치에 의하면, 제1 및 제2유압실린더에 오일탱크의 작동유를 토출시키는 가변형 유압펌프가 연결되고, 가변형 유압펌프에 제1 및 제2유압실린더에 걸리는 과부하를 방지시킬 수 있도록 제3 및 제4유압실린더가 관로로 연결되며, 제3 및 제4유압실린더에서 토출되는 작동유의 방향을 변환시키는 방향제어밸브와, 제4유압실린더에 저장된 작동유를 오일탱크로 복귀시키는 과부하 감지밸브를 관로로 연결시킴으로써, 제1 및 제2콘크리트 실린더 입구부에 비교적 큰 입자의 자갈 등이 끼워 있거나 또는 기계적인 고장 발생시 제1 및 제2유압실린더 측으로 적은 압력을 토출시켜 펌프의 수명을 연장시킬 있고, 특히 피스톤의 펌핑작용을 지속적으로 수행시킴에 따라 제1 및 제2콘크리트 실린더내에 유입된 콘크리트의 응고를 방지할 수 있다.As described above, according to the hydraulic apparatus for concrete discharge pressure control according to the present invention, a variable hydraulic pump for discharging hydraulic oil of an oil tank is connected to the first and second hydraulic cylinders, and the first and second hydraulic cylinders are connected to the variable hydraulic pump. The third and fourth hydraulic cylinders are connected to the pipeline so as to prevent overloading, and a direction control valve for changing the direction of the hydraulic oil discharged from the third and fourth hydraulic cylinders, and the hydraulic oil stored in the fourth hydraulic cylinder. By connecting the overload detection valve returning to the oil tank through the pipeline, when the large particle gravel or the like is inserted in the inlet of the first and second concrete cylinders or a mechanical failure occurs, a small pressure is discharged to the first and second hydraulic cylinders. In order to extend the service life of the pump, especially in the first and second concrete cylinders as the pumping It is possible to prevent solidification of the introduced concrete.

본 발명은 오일탱크의 작동유를 토출시키는 가변형 유압펌프에 제1 및 제2유압실린더가 관로에 의해 연결되고, 가변형 유압펌프에는 압력을 저하시키기 위한 제3 및 제4유압실린더가 관로로 연결되며, 제3 및 제4유압실린더에는 방향제어밸브와 과부하 감지밸브를 관로로 연결시킴으로써, 제1 및 제2콘크리트 실린더 입구부에 비교적 큰 입자의 자갈이 끼워 있거나 또는 일시적인 기계고장 발생시 제1 및 제2유압실린더 측으로 적은 압력을 토출시켜 펌프의 수명을 연장시킬 있고, 특히 피스톤의 펌핑작용을 지속적으로 수행시킴에 따라 제1 및 제2콘크리트 실린더내에 유입된 콘크리트의 응고를 방지할 수 있는 효과가 있다.In the present invention, the first and second hydraulic cylinders are connected to the variable hydraulic pump for discharging the hydraulic oil of the oil tank by a conduit, and the third and fourth hydraulic cylinders for reducing the pressure are connected to the variable hydraulic pump. By connecting the directional control valve and the overload detection valve to the third and fourth hydraulic cylinders in a pipeline, the first and second hydraulic cylinders have relatively large particles of gravel in the inlet of the first and second concrete cylinders or when a temporary mechanical failure occurs. By discharging a small pressure to the cylinder side to extend the life of the pump, in particular, by continuously performing the pumping action of the piston there is an effect that can prevent the solidification of the concrete introduced into the first and second concrete cylinder.

Claims (1)

믹싱된 콘크리트를 수용하는 교반장치에 제1 및 제2유압실린더가 결합되고, 상기 제1 및 제2실린더에는 유압펌프의 작동에 따라 오일탱크에 저장된 작동유를 공급받기 위한 관로가 연결되고, 상기 관로에는 작동유의 역류를 방지하는 셔틀밸브가 연결되어 있으며, 셔틀밸브의 관로에는 최고 압력을 제한할 수 있도록 릴리브 밸브가 연결되어 제1 및 제2유압실린더내에 설치된 피스톤을 펌핑시키는 유압장치에 있어서, 오일탱크내에 저장된 작동유를 제1 및 제2유압실린더 측으로 토출시키는 가변형 유압펌프와; 상기 가변형 유압펌프에 관로로 연결되어 제1 및 제2유압실린더에 걸리는 과부하를 방지시키기 위해 가변형 유압펌프의 압력을 제어하는 제3 및 제4유압실린더와; 상기 제3 및 제4유압실린더에서 토출되는 작동유의 방향을 변환시키기 위한 방향제어밸브와; 상기 방향제어밸브에 관로로 연결되어 제4유압실린더에 저장된 작동유를 오일탱크로 복귀시키는 과부하 감지밸브를 포함하여 구성됨을 특징으로 하는 콘크리트 토출압 제어용 유압장치.First and second hydraulic cylinders are coupled to a stirring device for accommodating mixed concrete, and the first and second cylinders are connected to a pipe for receiving hydraulic oil stored in an oil tank according to the operation of the hydraulic pump. In the hydraulic device for pumping the pistons installed in the first and second hydraulic cylinders are connected to the shuttle valve to prevent the back flow of the working oil, the relief valve is connected to limit the maximum pressure in the pipeline of the shuttle valve, A variable hydraulic pump for discharging hydraulic oil stored in the oil tank to the first and second hydraulic cylinders; Third and fourth hydraulic cylinders connected to the variable hydraulic pump by a pipe to control pressure of the variable hydraulic pump to prevent an overload on the first and second hydraulic cylinders; A direction control valve for changing a direction of hydraulic oil discharged from the third and fourth hydraulic cylinders; And an overload detection valve connected to the directional control valve by a pipe to return the working oil stored in the fourth hydraulic cylinder to the oil tank.
KR1019970005327A 1997-02-21 1997-02-21 Actuator controlling outlet pressure of concrete KR100208398B1 (en)

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