KR100521411B1 - Locking device for boom seating of concrete pump truck - Google Patents

Locking device for boom seating of concrete pump truck Download PDF

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Publication number
KR100521411B1
KR100521411B1 KR10-1998-0042184A KR19980042184A KR100521411B1 KR 100521411 B1 KR100521411 B1 KR 100521411B1 KR 19980042184 A KR19980042184 A KR 19980042184A KR 100521411 B1 KR100521411 B1 KR 100521411B1
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KR
South Korea
Prior art keywords
boom
rubber cushion
seating
solenoid valve
limit switch
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Application number
KR10-1998-0042184A
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Korean (ko)
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KR20000025202A (en
Inventor
한준현
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두산인프라코어 주식회사
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Priority to KR10-1998-0042184A priority Critical patent/KR100521411B1/en
Publication of KR20000025202A publication Critical patent/KR20000025202A/en
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Publication of KR100521411B1 publication Critical patent/KR100521411B1/en

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    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04GSCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G21/00Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
    • E04G21/02Conveying or working-up concrete or similar masses able to be heaped or cast
    • E04G21/04Devices for both conveying and distributing
    • E04G21/0418Devices for both conveying and distributing with distribution hose
    • E04G21/0445Devices for both conveying and distributing with distribution hose with booms
    • E04G21/0454Devices for both conveying and distributing with distribution hose with booms with boom vibration damper mechanisms
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04GSCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G21/00Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
    • E04G21/02Conveying or working-up concrete or similar masses able to be heaped or cast
    • E04G21/04Devices for both conveying and distributing
    • E04G21/0418Devices for both conveying and distributing with distribution hose
    • E04G21/0436Devices for both conveying and distributing with distribution hose on a mobile support, e.g. truck

Abstract

본 발명은 콘크리트펌프트럭의 붐 안착용 잠금장치에 관한 것으로, 붐을 지탱하는 기저부와, 이 기저부 위에 설치되어 붐의 하부면과 접촉하면서 진동시 붐의 충격을 흡수하기 위한 고무쿠션 및, 상기 기저부와 수직하게 설치되어 이 고무쿠션의 양측에서 붐의 좌우이동을 방지하도록 된 측면지지대들로 이루어진 붐 안착장치에 있어서, 상기 고무쿠션 내부에는 외압에 의해 작동되도록 된 리미트스위치가 장착되어 붐 안착장치에 붐이 안착되면 자동으로 전기적 신호를 송출하게 되고, 이에 따라 붐의 양측면에 설치된 공압실린더의 로드가 붐의 돌출단에 형성된 삽입구멍에 삽입됨으로써 붐을 고정할 수 있도록 된 것이다.The present invention relates to a boom seating locking device for a concrete pump truck, and a base for supporting the boom, and a rubber cushion for absorbing the impact of the boom during vibration while being installed on the base and in contact with the bottom surface of the boom, and the base In the boom seating device consisting of side supports installed vertically to prevent the left and right movement of the boom on both sides of the rubber cushion, the rubber cushion inside is equipped with a limit switch to be activated by external pressure to the boom seating device When the boom is seated, the electric signal is automatically sent out. Accordingly, the rods of the pneumatic cylinders installed on both sides of the boom are inserted into the insertion holes formed in the protruding end of the boom to fix the boom.

Description

콘크리트펌프트럭의 붐 안착용 잠금장치Locking device for boom seating of concrete pump truck

본 발명은 콘크리트 펌프트럭의 붐 안착장치에 붐을 고정시키기 위한 분 안착용 잠금장치에 관한 것으로, 특히 붐 안착장치 양쪽에 붐을 고정시키기 위한 공압실린더를 장착함으로써 차량의 진동에 의해 붐 안착장치로부터 붐이 이탈하여 진동하는 것을 방지하도록 된 콘크리트펌프트럭의 붐 안착용 잠금장치에 관한 것이다.The present invention relates to a minute seat lock for fixing a boom to a boom seat of a concrete pump truck, and in particular, by mounting a pneumatic cylinder for fixing the boom on both sides of the boom seat, It relates to a boom seating lock of the concrete pump truck to prevent the boom from vibrating away.

일반적으로, 건축현장에서는 각종 중장비가 사용되어지는데, 고층 또는 레미콘트럭 등의 믹서가 도달하지 못하는 장소에 콘크리트를 이송하기 위해서 콘크리트 펌프트럭이 사용되어지는바, 이 콘크리트 펌프 트럭은 통상 레미콘트럭으로부터 콘크리트를 공급받아 교반하는 호퍼와, 이 호퍼에서 교반되어 토출된 콘크리트를 요구되는 장소로 이송하여 타설하기 위해 다수개의 파이프가 접이식으로 연결되어 차량 위에 수납되는 붐(boom) 등으로 이루어져 있다.In general, various heavy equipments are used in construction sites, and concrete pump trucks are used to transport concrete to a place where a mixer such as a high-rise or ready-mixed concrete truck cannot reach. It is composed of a hopper for receiving and agitating, and a boom or the like, which is connected to a plurality of pipes to be folded and stored on the vehicle for transporting and placing concrete agitated and discharged from the hopper to a required place.

또한, 상기 붐은 유압에 의해 작동되고 콘크리트를 이송하는 압송파이프를 구비하고 있으며, 한 쪽 끝단이 콘크리트 펌프트럭의 전방부에 위치한 붐 선회장치에 설치되어, 콘크리트를 타설할 때는 접혀있던 붐이 유압에 의해 펴지고 스윙운동을 하면서 붐의 다른 쪽 끝단에 위치한 선단호스가 타설위치에 위치될 수 있도록 되어 있고, 차량이 이동할 때는 이 붐이 접혀진 상태로 이동하게 되는데, 이 때 접혀진 붐의 고정되지 않은 후방 부분은 차량 후방 선단 부근에 설치된 붐 안착장치에 안착되게 된다. In addition, the boom is operated by hydraulic pressure and has a pressure feeding pipe for transporting concrete, one end is installed in the boom turning device located in the front of the concrete pump truck, the boom folded when placing concrete is hydraulic The front end hose at the other end of the boom can be placed in the placing position while being unscrewed and swinged, and when the vehicle moves, the boom moves in a folded state. The part will rest on the boom seating device installed near the rear end of the vehicle.

한편, 이 붐 안착장치는 도 5에 도시된 바와 같이 붐 안착장치에 안착되는 붐(1)을 지지하는 기저부(2)와, 이 기저부(2) 위에 설치되어 붐(1)의 하부면(1a)과 접촉하면서 진동시 붐(1)의 충격을 흡수하기 위한 고무쿠션(3) 및, 상기 기저부(2)에 설치되어 이 고무쿠션(3)의 양측에서 붐(1)의 좌우이동을 방지하는 측면지지대(4, 4')로 이루어져 있다.Meanwhile, as shown in FIG. 5, the boom seating device includes a base 2 supporting the boom 1 seated on the boom seating device, and a lower surface 1a of the boom 1 installed on the base 2. Rubber cushion (3) for absorbing the impact of the boom (1) during vibration and in contact with the c), and is installed on the base (2) to prevent the left and right movement of the boom (1) on both sides of the rubber cushion (3) It consists of side supports (4, 4 ').

따라서, 차량 이동시에 접혀진 붐(1)의 하부면(1a)이 기저부(2) 상의 고무쿠션(3) 위에 안착된 상태에서 측면지지대(4, 4')에 의해 좌우요동이 방지되면서 안정된 주행이 가능하게 된다. Accordingly, stable running is prevented while the lower surface 1a of the boom 1, which is folded during vehicle movement, is prevented from lateral fluctuation by the side supports 4 and 4 'while the lower surface 1a of the boom 1 is seated on the rubber cushion 3 on the base 2. It becomes possible.

그러나, 상기와 같은 붐 안착장치에서는 붐이 상하운동을 하지 않도록 고정시켜주는 장치가 없으므로, 주행중 요철지형이나 비포장도로 등을 통과하면서 차량이 진동할 때 붐이 안착장치로부터 이격된 후 다시 안착되는 상하운동이 필연적으로 발생하여 붐 및 차량전체에 충격하중이 전달되게 되고, 이를 고무쿠션이 흡수한다하더라도 완전하지는 못하기 때문에 진동에 의한 피로가 누적되게 되어 붐과 차량의 내구성이 저하되는 문제점이 있었다.However, in the boom seating device as described above, there is no device to prevent the boom from moving up and down, so that when the vehicle vibrates while passing through the uneven terrain or the unpaved road, the boom is spaced from the seating device and then rested up and down again. Since the movement inevitably occurs, the shock load is transmitted to the boom and the entire vehicle, and even if the rubber cushion is absorbed, it is not perfect, and fatigue due to vibration accumulates, thereby deteriorating durability of the boom and the vehicle.

이에 본 발명은 상기와 같은 문제점을 해결하기 위한 것으로, 붐 안착장치에 붐이 안착되었을 때 이것을 자동으로 감지하여 붐을 고정시켜주게 됨으로써 붐이 안착장치로부터 이격되는 상하운동이 방지되고, 이에 따라 붐의 진동에 의한 충격하중을 최소화함으로써 차량 부품의 내구성 및 안전성이 향상되도록 된 콘크리트펌프트럭의 붐 안착용 잠금장치를 제공하는데 그 목적이 있다.Accordingly, the present invention is to solve the above problems, by automatically detecting this when the boom is seated on the boom seating device is fixed to the boom to prevent the vertical movement of the boom is separated from the seating device, accordingly It is an object of the present invention to provide a boom seating lock of a concrete pump truck to minimize the impact load caused by the vibration of the vehicle to improve the durability and safety of the vehicle parts.

상기와 같은 목적을 달성하기 위하여 본 발명은, 붐을 지탱하는 기저부와, 이 기저부 위에 설치되어 붐의 하부면과 접촉하면서 진동시 붐의 충격을 흡수하기 위한 고무쿠션 및, 상기 기저부와 수직하게 설치되어 이 고무쿠션의 양측에서 붐의 좌우이동을 방지하도록 된 측면지지대들로 이루어진 붐 안착장치에 있어서, 상기 고무쿠션 내부에는 외부압력에 의해 작동되도록 된 리미트스위치가 장착되고, 붐 안착장치 외부에 이 리미트스위치와 연결되어 리미트스위치로부터 전기적신호를 전달받아 작동되도록 된 솔레노이드밸브가 구비되며, 상기 측면지지대 각각의 내부에는 상기 공기탱크로부터 공기를 공급받아 피스톤 방식으로 왕복운동하는 로드가 갖춰진 공압실린더가 설치되는 한편, 상기 붐의 양측면에는 상기 공압실린더의 로드들을 수용하도록 상기 로드보다 약간 큰 직경을 갖는 구멍이 형성된 돌출단이 형성되게 된다.In order to achieve the above object, the present invention, the base for supporting the boom, the rubber cushion for absorbing the impact of the boom during the vibration while being installed on the base and in contact with the bottom surface of the boom, and installed perpendicular to the base In the boom seating device consisting of side supports to prevent the left and right movement of the boom on both sides of the rubber cushion, the rubber cushion is equipped with a limit switch to be operated by the external pressure, the outside of the boom seating device A solenoid valve is connected to the limit switch to receive an electrical signal from the limit switch and is operated. A pneumatic cylinder having a rod that reciprocates in a piston manner by receiving air from the air tank is installed inside each of the side supports. On the other hand, both sides of the boom to accommodate the rod of the pneumatic cylinder The protrusion is formed with a hole having a diameter slightly larger than that of the rod.

따라서, 상기 고무쿠션에 붐이 안착되면 이를 리미트스위치가 감지하여 공압솔레노이드밸브에 전기적신호를 전달하고, 이에 따라 공기탱크로부터 공압실린더에 공기가 공급되어 수축되어 있던 로드가 전진하여 붐의 구멍내에 삽입됨으로써 붐이 붐 안착장치에 고정되게 된다.Therefore, when the boom is seated on the rubber cushion, the limit switch senses the signal and transmits an electrical signal to the pneumatic solenoid valve. Accordingly, air is supplied from the air tank to the pneumatic cylinder and the rod that has been contracted is advanced to be inserted into the hole of the boom. This allows the boom to be fixed to the boom seat.

이하 첨부된 도면에 의거하여 상세히 설명한다.Hereinafter will be described in detail with reference to the accompanying drawings.

도 1은 본 발명에 따른 붐 안착용 잠금장치가 개략적으로 도시된 붐 안착장치의 단면도이며, 도 2a 내지 도 2c는 도 1의 붐 안착장치의 주요부를 분리하여 상세히 나타낸 도면들이고, 도 3은 도 1의 공압실린더를 작동시키기 위한 공압회로도, 도 4는 도 1의 잠금장치를 작동시키기 위한 전기회로도인바, 먼저 도 1과 도 2a 내지 도 2c에 도시된 바와 같이 본 발명에 따른 붐안착용 잠금장치는, 붐(1)을 지탱하는 기저부(2)와, 이 기저부(2) 위에 설치되어 붐(1)의 하부면(1a)과 접촉하면서 진동시 붐(1)의 충격을 흡수하기 위한 고무쿠션(3) 및, 상기 기저부(2)와 수직하게 설치되어 이 고무쿠션(3)의 양측에서 붐(1)의 좌우이동을 방지하도록 된 측면지지대(4, 4')들로 이루어진 붐 안착장치에 있어서, 상기 고무쿠션(3) 내부에는 외부압력에 의해 작동되도록 된 리미트스위치(5)가 장착되고, 붐 안착장치 외부에 이 리미트스위치(5)와 연결되어 리미트스위치(5)로부터 전기적신호를 전달받아 작동되는 솔레노이드밸브(8; 도 3) 및, 이 솔레노이드밸브(8)와 연결되어 솔레노이드밸브(8)의 작동에 따라 공기를 공급하도록 된 공기탱크(9)가 구비되며, 상기 측면지지대(4, 4') 각각의 내부에는 상기 공기탱크(9)로부터 공기를 공급받아 피스톤 방식으로 왕복운동하는 로드(6a, 6a')가 갖춰진 공압실린더(6, 6')가 설치되는 한편, 상기 붐(1)의 양측면에는 상기 공압실린더(6, 6')의 로드(6a, 6a')들을 수용하도록 상기 로드(6a, 6a')보다 약간 큰 직경을 갖는 구멍(7a, 7a')이 형성된 돌출단(7, 7')이 형성되어 이루어진다.1 is a cross-sectional view of a boom seating device schematically showing a boom seating lock according to the present invention, Figures 2a to 2c is a view showing in detail separated from the main part of the boom seating device of Figure 1, Figure 3 Figure 1 is a pneumatic circuit diagram for operating the pneumatic cylinder, Figure 4 is an electrical circuit diagram for operating the locking device of Figure 1, first shown in Figure 1 and 2a to 2c lock device for boom mounting according to the present invention And a rubber cushion for absorbing the impact of the boom 1 during vibration while being installed on the base 2 supporting the boom 1 and the bottom 2 a of the boom 1. 3) And, in the boom mounting device consisting of the side support (4, 4 ') is installed perpendicular to the base (2) to prevent the left and right movement of the boom (1) on both sides of the rubber cushion (3) In the rubber cushion (3), the limit switch is operated by an external pressure And a solenoid valve (8; FIG. 3) and a solenoid valve (8) mounted to the outside of the boom mounting device and connected to the limit switch (5) and operated by receiving an electrical signal from the limit switch (5). And an air tank 9 connected to the solenoid valve 8 to supply air according to the operation of the solenoid valve 8, and supplying air from the air tank 9 to each of the side supports 4 and 4 ′. Pneumatic cylinders 6 and 6 'equipped with rods 6a and 6a' which receive and reciprocate in a piston manner are installed, while rods 6a of the pneumatic cylinders 6 and 6 'are provided on both sides of the boom 1. And projections 7 and 7 'formed with holes 7a and 7a' having a diameter slightly larger than the rods 6a and 6a 'to accommodate 6a'.

또한 도 3의 공압회로도에 도시된 바와 같이, 상기 공기탱크(9)는 솔레노이드밸브(8)를 매개로 양측면의 측면지지대(4, 4')에 설치된 공압실린더(6, 6')와 연결되어 있으며, 상기 솔레노이드밸브(8)는 도 4에 도시된 바와 같이 붐이 안착되지 않은 상태에서 ON되어 있는 붐작동스위치(10)와, OFF되어 있는 리미트스위치(5)를 매개로 직렬로 연결되어 있는 바, 붐(1)이 고무쿠션(3)에 안착되면 리미트스위치(5)가 ON상태로 되고 전기가 흐르게 되어 솔레노이드밸브(8)가 작동되어 연결라인이 변환되게 되고, 이에 따라 공기탱크(9)로부터 공급라인을 따라 양측의 공압실린더(6, 6')내로 공기가 유입되어 로드(6a, 6a')를 밀어내게 되는 한편, 반대로 콘크리트를 타설하기 위해 붐을 움직이고자 하는 경우 붐작동스위치(10)를 OFF되게 하면 솔레노이드밸브(8)가 작동되지 않게 되어 연결라인이 원상태로 되고 공압실린더(6, 6')의 로드(6a, 6a')가 원상태로 후퇴하게 된다.In addition, as shown in the pneumatic circuit diagram of Figure 3, the air tank (9) is connected to the pneumatic cylinder (6, 6 ') installed on the side support (4, 4') on both sides via the solenoid valve (8) The solenoid valve 8 is connected in series via a boom operation switch 10 that is turned on in a state where the boom is not seated and a limit switch 5 that is turned off, as shown in FIG. 4. When the bar and the boom 1 are seated on the rubber cushion 3, the limit switch 5 is turned on and the electricity flows, so that the solenoid valve 8 is operated to convert the connection line. Accordingly, the air tank 9 Air flows into the pneumatic cylinders 6 and 6 'on both sides along the supply line to push out the rods 6a and 6a', while on the contrary, to move the boom to pour concrete, the boom operation switch ( If 10) is off, solenoid valve (8) will not operate. The air connection line is returned to its original state, and the rods 6a and 6a 'of the pneumatic cylinders 6 and 6' are retracted to their original state.

즉, 붐안착장치의 고무쿠션(3)에 붐이 안착되면 솔레노이드밸브(8)가 작동하여 공기탱크(9)로부터 양 측면지지대(4, 4')의 공압실린더(6, 6')에 공기를 유입시켜 로드(6a, 6a')를 밀어내게 되고, 이 로드(6a, 6a')의 끝단이 붐(1) 양측면의 돌출단(7, 7')에 형성된 구멍(7a, 7a') 내로 삽입되면서 붐(1)을 고정시키게 되며, 반대로 붐(1)을 붐안착장치로부터 해제하고자할 경우, 붐작동스위치(10)에 신호를 보내면 솔레노이드밸브(8)의 작동이 중지되고 공압실린더(6, 6')의 로드(6a, 6a')가 수축되면서 붐이 자유로운 상태로 놓여지게 된다.That is, when the boom is seated on the rubber cushion (3) of the boom seating device, the solenoid valve (8) is operated to provide air from the air tank (9) to the pneumatic cylinders (6, 6 ') of both side supports (4, 4'). The rods 6a and 6a 'are pushed out, and the ends of the rods 6a and 6a' are inserted into the holes 7a and 7a 'formed in the protruding ends 7 and 7' on both sides of the boom 1. The boom 1 is fixed while being inserted. On the contrary, when the boom 1 is to be released from the boom mounting device, a signal is sent to the boom operation switch 10 so that the solenoid valve 8 is stopped and the pneumatic cylinder 6 , 6 '), the boom is placed in a free state as the rods 6a and 6a' are contracted.

이상에서 설명한 바와 같이 본 발명에 따르면 콘크리트펌프트럭이 주행할 때 붐이 붐안착장치로부터 이격되는 것이 방지되어 진동에 의한 피로하중이 감소되므로, 차량 및 붐의 내구성과 안전성이 향상되는 효과가 있다.As described above, according to the present invention, since the boom is prevented from being spaced apart from the boom seating device when the concrete pump truck runs, fatigue load due to vibration is reduced, thereby improving durability and safety of the vehicle and the boom.

도 1은 본 발명에 따른 붐 안착용 잠금장치가 개략적으로 도시된 붐 안착장치의 단면도,1 is a cross-sectional view of the boom seating device schematically showing a boom seating lock according to the invention,

도 2a는 도 1의 공압실린더 부분의 확대 상세도,2A is an enlarged detail view of the pneumatic cylinder part of FIG. 1;

도 2b는 도 1의 붐 부분만을 분리하여 도시한 확대도,Figure 2b is an enlarged view showing only the boom portion of Figure 1 separated;

도 2c는 도 4b의 B부분에서 바라본 도 4b의 측면도,FIG. 2C is a side view of FIG. 4B seen from part B of FIG. 4B;

도 3은 도 1의 공압실린더를 작동시키기 위한 공압회로도,3 is a pneumatic circuit diagram for operating the pneumatic cylinder of FIG.

도 4는 도 1의 잠금장치를 작동시키기 위한 전기회로도,4 is an electric circuit diagram for operating the locking device of FIG.

도 5는 도 1의 대응도로서 종래의 붐 안착장치의 개략적인 단면도이다.FIG. 5 is a schematic cross-sectional view of a conventional boom mounting apparatus as a corresponding diagram of FIG. 1.

Claims (2)

붐(1)을 지탱하는 기저부(2)와, 이 기저부(2) 위에 설치되어 붐(1)의 하부면(1a)과 접촉하면서 진동시 붐(1)의 충격을 흡수하기 위한 고무쿠션(3) 및, 상기 기저부(2)와 수직하게 설치되어 이 고무쿠션(3)의 양측에서 붐(1)의 좌우이동을 방지하도록 된 측면지지대(4, 4')들로 이루어진 붐 안착장치에 있어서, A rubber cushion (3) for supporting the boom (1) and a rubber cushion (3) installed on the base (2) to absorb the impact of the boom (1) during vibration while in contact with the lower surface (1a) of the boom (1) And, in the boom mounting device consisting of side supports (4, 4 ') installed perpendicular to the base (2) to prevent the left and right movement of the boom (1) on both sides of the rubber cushion (3), 상기 고무쿠션(3) 내부에 장착되어 외부압력에 의해 작동되도록 된 리미트스위치(5)와, 이 리미트스위치(5)와 연결되어 리미트스위치(5)로부터 전기적신호를 전달받아 작동되는 솔레노이드밸브(8), 이 솔레노이드밸브(8)와 연결되어 솔레노이드밸브(8)의 작동에 따라 공기를 공급하도록 된 공기탱크(9), 상기 측면지지대(4, 4') 각각의 내부에 설치되어 상기 공기탱크(9)로부터 공기를 공급받아 피스톤 방식으로 왕복운동하는 로드(6a, 6a')가 갖춰진 공압실린더(6, 6') 및, 상기 붐(1)의 양측면에서 상기 공압실린더(6, 6')의 로드(6a, 6a') 끝단들이 삽입되는 구멍(7a, 7a')이 형성된 돌출단(7, 7')으로 이루어진 것을 특징으로 하는 콘크리트펌프트럭의 붐 안착용 잠금장치.A limit switch 5 mounted inside the rubber cushion 3 and operated by an external pressure, and a solenoid valve 8 connected to the limit switch 5 to receive an electrical signal from the limit switch 5 to operate. ), Which is connected to the solenoid valve 8 to supply air according to the operation of the solenoid valve 8, and is installed in each of the side supports 4 and 4 'and installed in the air tank ( 9) pneumatic cylinders 6, 6 'equipped with rods 6a, 6a' for receiving air from the piston and reciprocating in a piston manner, and the pneumatic cylinders 6, 6 'on both sides of the boom 1; Locking device for boom seating of a concrete pump truck, characterized in that consisting of protrusions (7, 7 ') formed with holes (7a, 7a') is inserted into the ends of the rod (6a, 6a '). 제 1항에 있어서, 상기 솔레노이드밸브(8)는 상기 리미트스위치(5)와 붐의 운동을 일으키는 붐작동스위치(10)와 전기적으로 직렬연결된 것을 특징으로 하는 콘크리트펌프트럭의 붐 안착용 잠금장치.The lock device for boom seating of a concrete pump truck according to claim 1, wherein the solenoid valve (8) is electrically connected in series with the limit switch (5) and the boom operation switch (10) causing the movement of the boom.
KR10-1998-0042184A 1998-10-09 1998-10-09 Locking device for boom seating of concrete pump truck KR100521411B1 (en)

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Publication number Priority date Publication date Assignee Title
CN109110698A (en) * 2018-09-11 2019-01-01 廖鑫 A kind of constructing tunnel crane of wire-tiing

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US7139064B2 (en) 2003-06-23 2006-11-21 Samsung Electronics Co., Ltd. Optical system for providing a hexapole illumination and method of forming a photoresist pattern on a substrate using the same

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KR0138443B1 (en) * 1995-10-24 1998-06-01 석진철 Device for separating a boom of a crane
KR19980074236A (en) * 1997-03-22 1998-11-05 토니헬샴 Attachment detachment device of heavy equipment
KR19990013812U (en) * 1997-09-30 1999-04-26 김형벽 2nd stage position control device of construction heavy equipment boom
KR19990033084A (en) * 1997-10-23 1999-05-15 추호석 Boom seating safety device for concrete pump truck

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Publication number Priority date Publication date Assignee Title
KR0138443B1 (en) * 1995-10-24 1998-06-01 석진철 Device for separating a boom of a crane
KR19980074236A (en) * 1997-03-22 1998-11-05 토니헬샴 Attachment detachment device of heavy equipment
KR19990013812U (en) * 1997-09-30 1999-04-26 김형벽 2nd stage position control device of construction heavy equipment boom
KR19990033084A (en) * 1997-10-23 1999-05-15 추호석 Boom seating safety device for concrete pump truck

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109110698A (en) * 2018-09-11 2019-01-01 廖鑫 A kind of constructing tunnel crane of wire-tiing

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