KR100563623B1 - Double transfer line for concrete pump car having superiority abrasion resistance - Google Patents

Double transfer line for concrete pump car having superiority abrasion resistance Download PDF

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KR100563623B1
KR100563623B1 KR1020040002519A KR20040002519A KR100563623B1 KR 100563623 B1 KR100563623 B1 KR 100563623B1 KR 1020040002519 A KR1020040002519 A KR 1020040002519A KR 20040002519 A KR20040002519 A KR 20040002519A KR 100563623 B1 KR100563623 B1 KR 100563623B1
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steel pipe
inner steel
pipe
concrete pump
wear resistance
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KR20050074677A (en
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정진현
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정진현
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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
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L9/00—Rigid pipes
    • F16L9/18—Double-walled pipes; Multi-channel pipes or pipe assemblies
    • 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
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
    • F16L55/02—Energy absorbers; Noise absorbers
    • 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
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
    • F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
    • F16L58/04—Coatings characterised by the materials used
    • F16L58/08—Coatings characterised by the materials used by metal

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Reciprocating Pumps (AREA)

Abstract

충격마모, 연삭마모에 강할 뿐만 아니라 내구성이 우수하여 소비자의 욕구를 충족시킬 수 있을 뿐만 아니라 사용수명을 연장할 수 있는 내마모성이 우수한 콘크리트 펌프카용 이중 이송관이 개시되어 있다. 본 발명에 따른 이송관은 통상적인 침탄분위기에서 침탄열처리하여 제작된 내측강관과; 내경측으로 내측강관이 강제 압입되는 외측강관과; 및 내측강관과 외측강관 사이에 도포되어 압입 하중을 감소시킴과 아울러 내측강관에 발생하는 충격을 전달 및 흡수하는 충진제로 이루어진다. Disclosed is a double feed pipe for a concrete pump car, which is not only resistant to impact and grinding wear, but also has excellent durability, which can satisfy consumer demands, as well as excellent wear resistance, which can extend service life. The transfer pipe according to the present invention includes an inner steel pipe manufactured by carburizing heat treatment in a conventional carburizing atmosphere; An outer steel pipe into which the inner steel pipe is forcibly pressed into the inner diameter side; And a filler that is applied between the inner steel pipe and the outer steel pipe to reduce the indentation load and to transmit and absorb the shock generated in the inner steel pipe.

Description

내마모성이 우수한 콘크리트 펌프카용 이중 이송관{Double transfer line for concrete pump car having superiority abrasion resistance}Double transfer line for concrete pump car having superiority abrasion resistance}

도 1은 본 발명에 따른 콘크리트 펌프카용 이중 이송관을 나타낸 단면도이고,1 is a cross-sectional view showing a double feed pipe for a concrete pump car according to the present invention,

도 2는 내측강관에 충진제가 도포된 상태에서 외측강관의 압입하중을 나타낸 표이며,2 is a table showing the indentation load of the outer steel pipe in the state that the filler is applied to the inner steel pipe,

도 3은 도 1에 도시된 이송관에 연결링이 조립된 상태를 나타낸 단면도이고, 3 is a cross-sectional view showing a state in which the connection ring is assembled to the transfer pipe shown in FIG.

도 4는 내측강관의 경도에 따른 토사마모시험결과를 나타낸 결과표이며, 그리고 4 is a result table showing the results of the soil wear test according to the hardness of the inner steel pipe, and

도 5는 토사마모시험장치의 개략도이다. 5 is a schematic diagram of the soil wear test apparatus.

＜도면의 주요부분에대한부호의설명＞<Description of the symbols for the main parts of the drawings>

100 : 이송관 110 : 내측강관100: transfer pipe 110: inner steel pipe

120 : 외측강관 130 : 충진제120: outer steel pipe 130: filler

140 : 연결링140: connection ring

본 발명은 내마모성이 우수한 콘크리트 펌프카용 이중 이송관에 관한 것으로서, 더욱 상세하게는 열처리된 내측강관, 내측강관을 감싸는 외측강관 및 내측강관과 외측강관으로 이루어진 이송파이프부 및 내측강관과 외측강관 사이에 충진되는 충진부를 구비함으로써, 충격마모, 연삭마모에 강할 뿐만 아니라 내구성이 우수하여 소비자의 욕구를 충족시킬 수 있을 뿐만 아니라 사용수명을 연장할 수 있는 내마모성이 우수한 콘크리트 펌프카용 이중 이송관 및 이의 제조방법에 관한 것이다.The present invention relates to a double conveying pipe for a concrete pump car excellent in wear resistance, and more particularly, a heat-treated inner steel pipe, an outer steel pipe surrounding the inner steel pipe, and a feed pipe part consisting of the inner steel pipe and the outer steel pipe and between the inner steel pipe and the outer steel pipe. By providing a filling part to be filled, it is not only resistant to impact and grinding wear, but also excellent in durability, which satisfies the needs of consumers, and has excellent wear resistance to extend the service life of the pump pump and its manufacturing method. It is about.

일반적으로, 콘크리트 펌프 트럭은 건설현장에서 콘크리트를 펌핑하여 고층의 건물까지 이송하는 장비이다. 콘크리트 펌프 트럭은 콘크리트를 밀어주는 실린더부와 압력을 가지는 슬러리 상태의 콘크리트를 이송하는 이송관으로 구성된다. 이들 부품들은 모래와 돌과 같은 고경도 재질이 혼합된 콘크리트 슬러리를 이송함으로서 항상 마모가 발생되며, 고압으로 콘크리트를 밀어줌으로서 높은 충격이 작용한다. 또한 고압에 의한 슬러리의 흐름에 의하여 이송관이 파손시 인명의 손상을 줄 수 있는 매우 중요한 기능성 부품이다. In general, a concrete pump truck is a equipment for pumping concrete to a high-rise building at the construction site. The concrete pump truck is composed of a cylinder for pushing concrete and a conveying pipe for transporting concrete in a slurry state with pressure. These parts are always worn out by transporting concrete slurry mixed with hard materials such as sand and stone, and high impact is achieved by pushing concrete at high pressure. In addition, it is a very important functional part that can damage the life of the transfer pipe due to the flow of the slurry by high pressure.

전술한 이송관의 파손을 막기 위하여 이송관의 재료로는 연성이 높은 열처리되지 않은 저탄소 강관을 사용하고 있고, 이러한 저탄소 강관은 열처리가 되지 않은 상태로 매우 경도(HV 250)가 낮아 고경도의 모래 등에 의하여 연삭마모(abrasive wear)가 발생되며, 또한 고압으로 이송되는 콘크리트에 의하여 충격마모(impact wear)가 이송관의 내측에서 발생되어 이송관의 수명이 감소하는 문제점이 발생하였고, 또한 염기성인 콘크리트에 의한 부식이 발생하는 문제점이 있었다. In order to prevent the damage of the above-mentioned conveying pipe, as the material of the conveying pipe, a low ductile low carbon steel pipe having high ductility is used, and the low carbon steel pipe has a high hardness (HV 250) due to its very low hardness (HV 250) without heat treatment. Abrasive wear is generated, and impact wear is generated inside the transfer pipe due to the concrete being transported at high pressure, thereby reducing the service life of the transfer pipe. There was a problem that corrosion occurs by.

이와 같은 문제점을 해결하기 위해서 열처리된 이송관이 개발되고 있는 실정이다. 그러나, 다수의 이송관들을 연결하여 사용함으로 이송관을 열처리하기 곤란하고 열처리 변형에 의한 치수관리가 어렵고, 내측과 외측을 조립하기 어려운 문제점이 있었다. 특히 내측강관을 열처리시 내측강관의 길이가 길어서 열처리에 따른 변형이 발생되어 외측강관 압입조립시에는 두 강관의 압입공차를 설정하기 곤란하다. 즉, 내측강관과 외측강관이 조립된 상태에서 이탈이 발생하지 않아야 함으로 압입 후 이탈력이 입계값이상을 유지해야 한다. 그리고 내측강관을 외측강관의 내부에 강제압입시 압입하중이 커서 압입장비의 대형화가 필수적이다. In order to solve this problem, a heat-treated transfer pipe is being developed. However, it is difficult to heat-treat the transfer pipe by using a plurality of transfer pipes, and it is difficult to manage the dimensions by the heat treatment deformation, and it is difficult to assemble the inside and the outside. In particular, when the inner steel pipe is heat-treated, the length of the inner steel pipe is long, so deformation due to the heat treatment occurs, so it is difficult to set the press-fitting tolerances of the two steel pipes when the outer steel pipe is press-assembled. That is, the separation should not occur in the state in which the inner steel pipe and the outer steel pipe are assembled, so that the leaving force after the press-fit should be kept above the grain boundary value. In addition, when the inner steel pipe is forcedly pressed into the inside of the outer steel pipe, the indentation load is large, and thus the size of the indentation equipment is essential.

본 발명은 상기와 같은 종래의 문제점을 해결하기 위해 안출된 것으로, 본 발명의 목적은, 열처리된 내측강관, 내측강관을 감싸는 외측강관 및 내측강관과 외측강관으로 이루어지 이송파이프부 및 내측강관과 외측강관 사이에 충진되는 충진부를 구비함으로써, 충격마모, 연삭마모에 강할 뿐만 아니라 내구성이 우수하여 소비자의 욕구를 충족시킬 수 있을 뿐만 아니라 사용수명을 연장할 수 있는 내마모성이 우수한 콘크리트 펌프카용 이중 이송관을 제공하는데 있다.The present invention has been made to solve the conventional problems as described above, the object of the present invention, the heat treatment of the inner steel pipe, the outer steel pipe surrounding the inner steel pipe and the inner steel pipe and the inner steel pipe consisting of a conveying pipe part and the inner steel pipe By providing filling parts filled between the outer steel pipes, it is not only resistant to impact and grinding wear, but also excellent in durability, which satisfies the needs of consumers, and has excellent wear resistance for extending the service life. To provide.

상기와 같은 본 발명의 목적을 달성하기 위해서 본 발명은,In order to achieve the object of the present invention as described above, the present invention,

콘크리트 펌프카용 이중 이송관에 있어서, In the double feed pipe for concrete pump cars,

통상적인 침탄분위기에서 침탄열처리하여 제작된 내측강관과;An inner steel pipe manufactured by carburizing heat treatment in a general carburizing atmosphere;

내경측으로 상기 내측강관이 강제 압입되는 외측강관과;An outer steel pipe into which the inner steel pipe is forcibly pressed into the inner diameter side;

상기 내측강관과 상기 외측강관 사이에 도포되어 압입 하중을 감소시킴과 아울러 상기 내측강관에 발생하는 충격을 전달 및 흡수하는 충진제로 이루어진 내마모성이 우수한 콘크리트 펌프카용 이중 이송관을 제공한다.It is applied between the inner steel pipe and the outer steel pipe to reduce the indentation load, and provides a double transfer pipe for a concrete pump car excellent in wear resistance consisting of a filler for transmitting and absorbing the shock generated in the inner steel pipe.

바람직하게는, 내측강관은 탄소농도가 중량비로 0.30～0.65％를 가지는 탄소강을 탄소농도가 1.0％이상인 통상적인 침탄분위기에서 침탄열처리되면서 HV 600이상의 경도를 가지도록 제작된다. Preferably, the inner steel pipe is manufactured to have a hardness of HV 600 or more while carburizing heat treatment of a carbon steel having a carbon concentration of 0.30 to 0.65% by weight in a carburizing atmosphere having a carbon concentration of 1.0% or more.

더욱 바람직하게는, 부식성이 강한 바닷물이나 고온의 부식성 성분으로 이루어진 매질을 이송할 수 있도록 내식성이 강한 크롬(Cr)성분이 포함된 탄소 크롬강을 통상의 침탄열처리한 후 표면에 크롬가바이드가 형성될 수 있다. More preferably, the chromium carbide may be formed on the surface after the usual carburizing heat treatment of the carbon chromium steel containing the highly corrosion-resistant chromium (Cr) component to transport the medium consisting of highly corrosive sea water or high temperature corrosive components have.

이상에서 설명한 바와 같이, 본 발명에 따르면, 충격마모, 연삭마모에 강할 뿐만 아니라 내구성이 우수하여 소비자의 욕구를 충족시킬 수 있을 뿐만 아니라 사용수명을 연장할 수 있다.As described above, according to the present invention, it is not only resistant to impact abrasion and grinding wear, but also excellent in durability, thereby satisfying the needs of consumers and extending the service life.

이하, 첨부된 도면들을 참조하여 본 발명의 바람직한 실시예에 따른 내마모성이 우수한 콘크리트 펌프카용 이중 이송관에 대해 설명한다.Hereinafter, with reference to the accompanying drawings will be described for a double transport pipe for a concrete pump car excellent in wear resistance according to an embodiment of the present invention.

도 1은 본 발명에 따른 콘크리트 펌프카용 이중 이송관을 나타낸 단면도이다. 1 is a cross-sectional view showing a double feed pipe for a concrete pump car according to the present invention.

도 1을 참조하면, 본 발명에 따른 콘크리트 펌프카용 이중 이송관(100)은 내측강관(110), 내측강관(110)이 압입 장착되는 외측강관(120) 및 내측강관(110)과 외측강관(120) 사이에 도포되는 충진제(130)를 구비한다. Referring to FIG. 1, a double feed pipe 100 for a concrete pump car according to the present invention includes an inner steel pipe 110, an inner steel pipe 110, and an inner steel pipe 110 press-fitted with an inner steel pipe 110 and an outer steel pipe 110. Filler 130 is applied between the 120.

먼저, 내측강관(110)은 탄소농도가 중량비로 0.30～0.65％를 가지는 탄소강을 탄소농도가 1.0％이상인 통상적인 침탄분위기에서 침탄열처리하여 제작된다. 또한 내측강관(110)은 HV 600이상의 경도를 가지도록 제작된다. 바람직하게는, 내측강관(110)은 내식성이 강한 크롬(Cr)성분이 포함된 탄소 크롬강을 통상의 침탄열처리를 수행한 후 크롬가바이드를 표면에 대량으로 형성시켜 부식성이 강한 바닷물이나 고온의 부식성 성분으로 이루어진 매질을 이송할 수 있다. 이와 같이 제작된 내측강관(110)에는 외측강관(120) 및 충진제(130)가 배치된다. First, the inner steel pipe 110 is produced by carburizing heat treatment of a carbon steel having a carbon concentration of 0.30 to 0.65% by weight in a conventional carburizing atmosphere having a carbon concentration of 1.0% or more. In addition, the inner steel pipe 110 is manufactured to have a hardness of HV 600 or more. Preferably, the inner steel pipe 110 is formed of a large amount of chromium carbide on the surface of the carbon chromium steel containing a high corrosion resistance chromium (Cr) component after the usual carburizing heat treatment to form a highly corrosive sea water or high temperature corrosive components The medium consisting of can be transferred. An inner steel pipe 120 and the filler 130 is disposed in the inner steel pipe 110 manufactured as described above.

외측강관(120)은 HV 250 정도의 경도를 가지는 통상의 강관으로 제작된다. 이러한 외측강관(120)의 내경은 내측강관(110)의 외경에 원활하게 끼워질 수 있도록 내측강관(110)의 외경보다 크게 형성된다. 바람직하게는 내측강관(110)의 외경과 외측강관(120)의 내경은 통상적인 헐거운 끼워맞춤 또는 억기끼움 공차범위이다. The outer steel pipe 120 is made of a conventional steel pipe having a hardness of about 250 HV. The inner diameter of the outer steel pipe 120 is formed larger than the outer diameter of the inner steel pipe 110 so that it can be fitted smoothly to the outer diameter of the inner steel pipe (110). Preferably, the outer diameter of the inner steel pipe 110 and the inner diameter of the outer steel pipe 120 is a conventional loose fit or suppression tolerance range.

한편, 충진제(130)는 외측강관(120)이 내측강관(110)에 압입 장착될 때 마찰력을 감소시킬 수 있도록 내측강관(110)의 외경부에 도포된다. 충진제(130)로는 그리이스 또는 경화성수지를 마련한다. 이러한 충진제(130)는 내측강관(110)에서 발생되는 충격하중을 외측강관에 전달하거나 흡수할 수 있을 뿐만 아니라 외측강관(120)의 압입하중을 줄일 수 있다. On the other hand, the filler 130 is applied to the outer diameter portion of the inner steel pipe 110 to reduce the friction when the outer steel pipe 120 is press-fitted to the inner steel pipe 110. Filler 130 is provided with a grease or curable resin. The filler 130 may not only transfer or absorb the impact load generated from the inner steel pipe 110 to the outer steel pipe, but also reduce the indentation load of the outer steel pipe 120.

도 2는 내측강관에 충전제가 도포된 상태에서 외측강관의 압입하중을 나타낸 표이다. Figure 2 is a table showing the indentation load of the outer steel pipe in the state that the filler is applied to the inner steel pipe.

도 2를 참조하면, 내측강관(110)과 외측강관(120)의 압입하중을 측정한 결과 충진제(130)를 도포하지 않은 것에 비하여 충진제(130)를 도포한 것이 도포하지 않 은 것에 비하여 압입하중이 약 3배 정도 작게 나타났다. 그러나 충진제(130) 중 그리이스는 점도가 40℃에서 460cst이하인 경우에는 충분한 표면장력이 부족하여 내측강관(110)과 외측강관(120) 사이에 충진되지 않고, 상온에서 방출됨으로서 충분한 충진제(130)로서의 역할을 수행하지 못하고 단지 압입시 압입하중을 감소시키는 역할만을 수행한다. 따라서 내측강관(110)을 압입시 내측강관의 외주면에 도포되는 그리이스의 점도는 최소한 460cst 이상을 만족해야 한다. 또한 그리이스는 기유에 상관없이 모두 사용이 가능하다. 이러한 그리이스는 충격흡수뿐만 아니라, 콘크리트나 해수 등의 부식성 환경에서 내식성을 확보하여 내측강관(110) 및 외측강관(120) 접촉부에 발생하는 발청을 막아준다. Referring to FIG. 2, the indentation load of the inner steel pipe 110 and the outer steel pipe 120 was measured, and the indentation load of the filler 130 coated with the filler 130 was not applied. This is about three times smaller. However, when the viscosity of the filler 130 is 460 cst or less at 40 ° C., the grease is not filled between the inner steel pipe 110 and the outer steel pipe 120 due to lack of sufficient surface tension, and is discharged at room temperature, thereby being sufficient as the filler 130. It does not play a role and only plays a role of reducing the indentation load during indentation. Therefore, when the inner steel pipe 110 is press-fitted, the viscosity of the grease applied to the outer circumferential surface of the inner steel pipe should satisfy at least 460 cst or more. Grease can be used regardless of the base oil. This grease not only absorbs shock, but also secures corrosion resistance in a corrosive environment such as concrete or seawater, thereby preventing rust occurring in the contact portion of the inner steel pipe 110 and the outer steel pipe 120.

한편, 충진제(130)인 경화성수지는 염기성 경화수지로서, 외측강관(120)의 내측에 압입한 경우에는 압입 후 경화성수지가 경화될 수 있도록 150～200℃ 정도에서 압입된 상태로 화염 또는 퍼니스 가열하여 경화성수지가 내측강관(110)과 외측강관(120)의 틈새에서 경화된다. 이러한 경화성수지는 내측강관(110)의 압입시 윤활제 역할을 수행하여 압입하중을 줄여주는 역할뿐만 아니라 내측강관(110)과 외측강관(120)의 틈새에서 고착되어 내측강관(110)에서 발생되는 충격을 전달 및 흡수하고 내,외측강관의 압입 틈새로 이물질이 유입되는 것을 방지한다. On the other hand, the curable resin 130 is a basic curable resin, when pressed into the inner side of the outer steel pipe 120, the flame or furnace heated in a press-fitted state at about 150 ~ 200 ℃ to cure the curable resin after indentation The curable resin is cured in the gap between the inner steel pipe 110 and the outer steel pipe 120. Such a curable resin serves as a lubricant during the indentation of the inner steel pipe 110 to reduce the indentation load, as well as the impact generated from the inner steel pipe 110 is fixed in the gap between the inner steel pipe 110 and the outer steel pipe 120. It transmits and absorbs and prevents foreign substances from entering into the indentation gap of inner and outer steel pipes.

도 3은 도 1에 도시된 이송관에 연결링이 조립된 상태를 나타낸 단면도이다. 3 is a cross-sectional view showing a state in which the connection ring is assembled to the transfer pipe shown in FIG.

도 3을 참조하면, 연결링(140)은 다수의 이송관(100)들을 연결하기 위한 통상의 플랜지 형상을 가진다. 이러한 연결링(140)은 내측강관(110)의 양단 외경에 억지로 끼워진 상태 하에서 외측강관(120)에 맞대기 용접된다. 이와 같이 결합된 연결링(140)은 내측강관(110)의 외경에 압입조립됨으로 외측강관(120)과의 용접부가 파손되거나 크랙이 발생하여도 내측강관(110)이 이를 보상하여 이송중인 콘크리트의 누출을 막을 수 있다. Referring to FIG. 3, the connection ring 140 has a conventional flange shape for connecting a plurality of transfer pipes 100. The connection ring 140 is butt welded to the outer steel pipe 120 in a state that is forcibly fitted to the outer diameter of both ends of the inner steel pipe 110. The coupling ring 140 coupled as described above is press-assembled to the outer diameter of the inner steel pipe 110 so that even if a welding part with the outer steel pipe 120 is broken or cracks are generated, the inner steel pipe 110 compensates for this and thus transfers concrete. Leakage can be prevented.

도 4는 내측강관의 경도에 따른 토사마모시험결과를 나타낸 결과표이며, 그리고 도 5는 토사마모시험장치의 개략도이다. Figure 4 is a result table showing the results of the soil wear test according to the hardness of the inner steel pipe, and Figure 5 is a schematic diagram of the soil wear tester.

도 4 및 5를 참조하면, 토사마모시험은 규사(Si02, HV 2000)에 대한 상대재의 내마모성을 평가하는 ASTM규격에 의거하여 시험한 결과이다. 4 and 5, the tosa wear test is a test result based on the ASTM standard for evaluating the wear resistance of the counterpart against the silica sand (Si02, HV 2000).

모래가 노즐을 통하여 시편과 고무휠사이로 분사되면 래버에 장착된 무게가 시편에 하중을 가하면서 내측강관(110)의 마모량을 평가하는 시험장치(10)이다. 이때 마모량은 내측강관(110)의 마모부피를 내측강관(110)의 비중으로 나누어서 두께감소량을 마모두께로 표현한다. 여기서 내측강관(110)의 경도에 따른 토사마모시험결과에서와 같이 내측강관(110)의 재질의 탄소농도가 0.15로 작은 경우에는 침탄열처리 유,무에 따른 경도차이로 토사에 의한 마모량이 2배 가량 차이가 발생되며, 그리고 동일한 침탄열처리 조건에서도 재질의 탄소농도가 상대적으로 높은 실시예2이 실시예2보다 유사한 경도에서 마모량이 적게 나타났다. 또한 실시예4에서 재질의 탄소농도가 0.45％이고 침탄시 탄소분위기를 1.0～1.2로 높인 경우에는 경도 대비 토사마모량이 급격히 감소하여 열처리하지 않은 실시예 대비 10배이상의 토사마모량이 적게 나타났다. 실시예 3, 4, 5에서 침탄시 탄소농도 분위기를 1.0～1.2로 높인 경우가 경도도 높아지고 토사마모량도 상대적으로 감소하였다. When sand is injected between the specimen and the rubber wheel through the nozzle is a test device 10 to evaluate the amount of wear of the inner steel pipe 110 while the weight mounted on the lever is applied to the specimen. At this time, the wear amount is divided by the wear volume of the inner steel pipe 110 by the specific gravity of the inner steel pipe 110 to express the amount of reduced thickness as the wear thickness. Here, when the carbon concentration of the material of the inner steel pipe 110 is as small as 0.15 as shown in the soil-to-wear test results according to the hardness of the inner steel pipe 110, the amount of wear due to soiling is doubled due to the hardness difference according to the presence or absence of carburizing heat treatment. There is a slight difference, and even in the same carburizing heat treatment condition, Example 2 having a relatively high carbon concentration of the material showed less wear at similar hardness than Example 2. In addition, in Example 4, when the carbon concentration of the material was 0.45% and the carbon atmosphere during carburization was increased to 1.0 to 1.2, the amount of sediment wear decreased rapidly compared to the hardness, resulting in less than 10 times the amount of sediment wear compared to the non-heat treated example. In Examples 3, 4, and 5, when the carbon concentration atmosphere was increased to 1.0 to 1.2, the hardness was increased and the amount of tosa was relatively decreased.

전술한 바와 같이, 본 발명에 따른 이송관(100)은 침탄열처리된 내측강관(110)을 외측강관(120)의 내측에 압입시, 내측강관(110)과 외측강관(120) 사이에 도포되는 충진제(130)를 구비함으로써, 압입시 마찰력을 감소시켜서 압입하중을 감소시켜 압입장비의 용량을 작게 설계할 수 있는 장점이 있으며, 충진제(130)를 도포함으로서, 내측강관(110)에 발생하는 충격하중을 흡수하여 이송관(100)에 작용하는 충격을 완화시킬 수 있는 잇점이 있다.As described above, the transfer pipe 100 according to the present invention is applied between the inner steel pipe 110 and the outer steel pipe 120 when the carburized heat-treated inner steel pipe 110 is pressed in the inner side of the outer steel pipe 120. By providing the filler 130, there is an advantage that the capacity of the indentation equipment can be reduced by reducing the indentation load by reducing the friction force during the indentation, by including the filler 130, the impact generated on the inner steel pipe 110 There is an advantage that can absorb the load to mitigate the impact acting on the transfer pipe (100).

상기에서는 본 발명의 바람직한 실시예를 참조하여 설명하였지만, 해당기술 분야의 숙련된 당업자는 특허청구범위에 기재된 본 발명의 사상 및 영역으로부터 벗어나지 않는 범위내에서 본 발명을 다양하게 수정 및 변경시킬 수 있음을 이해할 수 있을 것이다.Although described above with reference to a preferred embodiment of the present invention, those skilled in the art can be variously modified and changed within the scope of the invention without departing from the spirit and scope of the invention described in the claims You will understand.

Claims (7)

콘크리트 펌프카용 이중 이송관에 있어서, In the double feed pipe for concrete pump cars, 탄소농도가 중량비로 0.30～0.65％를 가지는 탄소강을 탄소농도가 1.0％이상인 통상적인 침탄분위기에서 침탄열처리하여 HV 600이상의 경도를 가지도록 제작된 내측강관;An inner steel pipe manufactured to have a hardness of HV 600 or more by carburizing heat treatment of carbon steel having a carbon concentration of 0.30 to 0.65% by weight in a carburizing atmosphere having a carbon concentration of 1.0% or more; 내경측으로 상기 내측강관이 강제 압입되는 외측강관과;An outer steel pipe into which the inner steel pipe is forcibly pressed into the inner diameter side; 상기 내측강관과 상기 외측강관 사이에 도포되어 압입 하중을 감소시킴과 아울러 상기 내측강관에 발생하는 충격을 흡수하는 충진제로 이루어진 것을 특징으로 하는 내마모성이 우수한 콘크리트 펌프카용 이중 이송관.It is applied between the inner steel pipe and the outer steel pipe to reduce the indentation load, and a double transfer pipe for a wear resistance concrete pump car, characterized in that made of a filler for absorbing the shock generated in the inner steel pipe. 삭제delete 제 1 항에 있어서, 상기 내측강관은 부식성이 강한 바닷물이나 고온의 부식성 성분으로 이루어진 매질을 이송할 수 있도록 내식성이 강한 크롬(Cr)성분이 포함된 탄소 크롬강을 통상의 침탄열처리한 후 표면에 크롬가바이드가 형성될 수 있는 것을 특징으로 하는 내마모성이 우수한 콘크리트 펌프카용 이중 이송관.The method of claim 1, wherein the inner steel pipe is chromium is added to the surface after the usual carburizing heat treatment of carbon chromium steel containing a highly corrosion-resistant chromium (Cr) component to transport the medium consisting of highly corrosive sea water or high temperature corrosive components Double transport pipe for a concrete pump car with excellent wear resistance, characterized in that the vice can be formed. 제 1 항에 있어서, 상기 충전제는 그리이스 또는 경화성수지 중 어느 하나인 것을 특징으로 하는 내마모성이 우수한 콘크리트 펌프카용 이중 이송관.The double feed pipe for a concrete pump car having excellent wear resistance according to claim 1, wherein the filler is one of a grease or a curable resin. 제 4 항에 있어서, 상기 그리이스는 점도가 최소한 460cst 이상을 만족하는 것을 특징으로 하는 내마모성이 우수한 콘크리트 펌프카용 이중 이송관.5. The double feed pipe for concrete pump cars as claimed in claim 4, wherein the grease satisfies at least 460 cst of viscosity. 제 4 항에 있어서, 상기 경화성수지는 150～250℃에서 열경화되어 상기 내측강관과 상기 내측강관의 틈새에 경화되는 염기성 경화수지인 것을 특징으로 하는 내마모성이 우수한 콘크리트 펌프카용 이중 이송관.According to claim 4, wherein the curable resin is heat-cured at 150 ~ 250 ℃ the dual transfer pipe for wear resistance concrete pump car, characterized in that the basic curing resin which is cured in the gap between the inner steel pipe and the inner steel pipe. 제 1 항에 있어서, 다수의 상기 이송관을 연결하기 위한 상기 내측강관의 양단 외경에는 통상의 플랜지 형상을 가지는 연결링이 억지로 끼워진 상태에서 상기 외측강관에 맞대기 용접되는 것을 특징으로 하는 내마모성이 우수한 콘크리트 펌프카용 이중 이송관.The concrete having excellent wear resistance according to claim 1, wherein the outer diameters of both ends of the inner steel pipe for connecting the plurality of the conveying pipes are welded to the outer steel pipe in a state in which a connection ring having a normal flange shape is forcibly fitted. Double feed pipe for pump cars.
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JPS58106687U (en) 1982-01-14 1983-07-20 デンカエンジニアリング株式会社 Wear-resistant bent pipe
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KR100723209B1 (en) 2005-12-23 2007-05-29 주식회사 포스코 Filled double steel tube for mechanical structure
KR100875635B1 (en) * 2007-12-28 2008-12-26 한국생산기술연구원 Double layer pipe
KR100889289B1 (en) 2008-07-23 2009-03-17 이해식 Pipe using a bonded steel plate
KR100874502B1 (en) * 2008-07-31 2008-12-18 한국생산기술연구원 Bow-type double layer pipe
JP2020521085A (en) * 2017-05-22 2020-07-16 周朝▲輝▼ＺＨＯＵ， Ｚｈａｏｈｕｉ Method of manufacturing split type high wear resistant double layer straight pipe and corresponding wear resistant straight pipe
JP7266303B2 (en) 2017-05-22 2023-04-28 周朝▲輝▼ Manufacturing method of split-type highly wear-resistant double-layer straight pipe and corresponding wear-resistant straight pipe
KR20210157777A (en) 2020-06-22 2021-12-29 오케이퓨쳐 주식회사 Lifting apparatus for pipe of pump car

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