KR100806942B1 - Polyethylenes and ceramic coating device for steel tube and coating method - Google Patents

Polyethylenes and ceramic coating device for steel tube and coating method

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Publication number
KR100806942B1
KR100806942B1 KR1020070096030A KR20070096030A KR100806942B1 KR 100806942 B1 KR100806942 B1 KR 100806942B1 KR 1020070096030 A KR1020070096030 A KR 1020070096030A KR 20070096030 A KR20070096030 A KR 20070096030A KR 100806942 B1 KR100806942 B1 KR 100806942B1
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South Korea
Prior art keywords
steel pipe
coating
ceramic
polyethylene
ceramic paint
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KR1020070096030A
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Korean (ko)
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김준성
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(주) 케이 앤 지 스틸
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Priority to KR1020070096030A priority Critical patent/KR100806942B1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B13/00—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00
    • B05B13/06—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00 specially designed for treating the inside of hollow bodies
    • B05B13/0645—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00 specially designed for treating the inside of hollow bodies the hollow bodies being rotated during treatment operation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/08—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by flames
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
    • B05D7/146—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies to metallic pipes or tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/22—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to internal surfaces, e.g. of tubes
    • B05D7/222—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to internal surfaces, e.g. of tubes of pipes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/50—Multilayers
    • B05D7/56—Three layers or more
    • B05D7/58—No clear coat specified
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C3/00—Abrasive blasting machines or devices; Plants
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D1/00—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2504/00—Epoxy polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2507/00—Polyolefins
    • B05D2507/01—Polyethylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2507/00—Polyolefins
    • B05D2507/01—Polyethylene
    • B05D2507/015—Polyethylene modified

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

A device and a method for coating a steel pipe with polyethylene and ceramic in three layers are provided to prevent a coating of the steel pipe from being separated by the soot, by making a heating chamber in an opening and closing type. In a device for coating a steel pipe(20) with polyethylene and ceramic in three layers, a rotating unit(30) is disposed in a heating chamber(10) of which the lateral sides are opened and closed. The rotating unit horizontally turns the steel pipe while placing the steel pipe. A heating unit(40) is disposed in the heating chamber and arranged at the lower side of the rotating unit to heat the steel pipe. An outer surface coating unit successively coats the surface of the steel pipe heated by the heating unit, with epoxy, modified polyethylene, and polyethylene. A cooling unit cools down the steel pipe coated by the outer surface coating unit. An inner surface coating unit coats the inner surface of the steel pipe cooled by the cooling unit, with ceramic.

Description

3층 폴리에틸렌과 세라믹을 강관에 코팅하는 장치 및 방법{Polyethylenes and ceramic coating device for steel tube and coating method}Polyethylenes and ceramic coating device for steel tube and coating method

본 발명은 3층 폴리에틸렌과 세라믹을 강관에 코팅하는 장치 및 방법에 관한 것으로서, 특히 강관을 전체적으로 균일하게 가열하여 강관 외면에 코팅되는 에폭시와 개질 폴리에틸렌 및 폴리에틸렌의 코팅두께를 일정하게 할 수 있을 뿐만 아니라 강관 내면에 세라믹 코팅을 신속하고 균일하게 할 수 있는 3층 폴리에틸렌과 세라믹을 강관에 코팅하는 장치 및 방법에 관한 것이다.The present invention relates to an apparatus and method for coating three-layer polyethylene and ceramics on a steel pipe, and in particular, it is possible to uniformly heat the steel pipe as a whole so as to make the coating thickness of the epoxy and the modified polyethylene and polyethylene coated on the outer surface of the steel pipe constant. The present invention relates to an apparatus and a method for coating a steel pipe with three-layer polyethylene and a ceramic capable of quickly and uniformly coating a ceramic on an inner surface of a steel pipe.

일반적으로, 관 또는 파이프는 유체를 이송시키기 위하여 사용되는 안내부재를 말한다. 이러한 관들은 재질에 따라 강관, 동관, 주철관, 수지관 등으로 분류할 수 있고, 이러한 관들을 상수도와 하수도에 사용하거나 유류, 가스 등의 유체를 이송하기 위하여 사용할 때에는 방청, 방식 등의 성능을 갖추도록 하여야만 관의 내구성을 증대할 수 있을 뿐만 아니라 이송대상 유체의 물성을 보존할 수 있다.In general, a pipe or pipe refers to a guide member used for transporting a fluid. These pipes can be classified into steel pipes, copper pipes, cast iron pipes, resin pipes, etc., depending on the material.These pipes have anti-corrosion and anticorrosive properties when used for water and sewage, or for transporting fluids such as oil and gas. It is possible to increase the durability of the pipe as well as to preserve the physical properties of the fluid to be transferred.

따라서, 상기한 관의 종류 중에서 특히 많이 사용되는 강관은 방청, 방식의 기능들을 갖도록 하기 위하여 외면에 폴리에틸렌 코팅층을 형성시키고 내면에 세라믹층을 형성시킨다.Therefore, steel pipes, which are particularly used among the above types of pipes, form a polyethylene coating layer on the outer surface and a ceramic layer on the inner surface in order to have the functions of rust prevention and anticorrosion.

강관의 외면에 폴리에틸렌 3층 코팅층을 형성시키기 위한 종래의 일반적인 방법을 개략적으로 설명하면 다음과 같다.A general general method for forming a polyethylene three-layer coating layer on the outer surface of a steel pipe is as follows.

먼저, 강관의 외면을 깨끗하게 하기 위하여 표면의 이물질을 제거하고, 그런 다음 상기 강관을 폴리에틸렌 코팅에 적합한 온도로 예열하며, 분말식 코팅방법 또는 압출식 코팅방법을 이용하여 강관의 외면에 분말 에폭시와 접착제를 도포한 후, 그 위에 폴리에틸렌 코팅층을 형성시킨다. 이어서 폴리에틸렌 코팅층을 형성한 강관을 냉각시킴으로써 코팅을 마치게 된다.First, remove foreign substances on the surface to clean the outer surface of the steel pipe, and then preheat the steel pipe to a temperature suitable for polyethylene coating, and powder epoxy and adhesive on the outer surface of the steel pipe by using a powder coating method or an extrusion coating method. After the coating, a polyethylene coating layer is formed thereon. The coating is then finished by cooling the steel pipe on which the polyethylene coating layer is formed.

분말식 폴리에틸렌 3층코팅 강관을 제조하기 위하여 예열하는 방법은 도 1에 도시된 바와 같이 가열실(1) 내에 레일(2)을 설치하고 상기 레일(2) 위에 코팅하고자 하는 강관(3)을 배치한 다음 상기 레일(2)의 하측에 가스토치(4)를 설치하여 가열실(1) 내부의 분위기를 300℃까지 상승시켜 가열실(1) 내부의 분위기에 의하여 강관을 예열하는 방식을 취하고 있다.The preheating method for manufacturing a powdered polyethylene three-layer coated steel pipe includes installing a rail (2) in a heating chamber (1) and arranging a steel pipe (3) to be coated on the rail (2) as shown in FIG. Then, a gas torch 4 is installed below the rail 2 to raise the atmosphere inside the heating chamber 1 to 300 ° C. and preheat the steel pipe by the atmosphere inside the heating chamber 1. .

그러나, 상기와 같은 방법은 가열실의 분위기를 300℃까지 끌어올리기 위하여 2시간 이상 가열해야 하므로 연료의 소비가 많아질 뿐만 아니라 생산성이 저하되고 가스토치의 화염에 가까운 강관 부분은 온도가 높고 반대쪽은 온도가 낮아서 온도편차가 크게 되므로 이로 인하여 온도가 높은 강관부분은 두껍게 코팅이 되고 온도가 낮은 부분은 얇게 코팅이 코팅이 되는 코팅두께의 편차가 발생된다.However, the above method requires heating for more than 2 hours in order to raise the atmosphere of the heating chamber to 300 ° C., which increases fuel consumption, reduces productivity, and increases the temperature of the steel pipe near the flame of the gas stove. Due to the low temperature, the temperature deviation is large, which causes the high temperature steel pipe part to be thickly coated and the low temperature part to be thinly coated.

또한, 가열실이라는 밀폐된 공간에서 가스토치로 강관을 가열하기 때문에 가 스가 불완전 연소되었을 때 그을음이 발생하여 이 그을음이 강관의 표면에 부착됨으로써 코팅박리의 원인이 되는 문제점이 있다.In addition, since the steel pipe is heated with a gas torch in an enclosed space called a heating chamber, soot is generated when the gas is incompletely burned, so that the soot adheres to the surface of the steel pipe, thereby causing coating peeling.

그리고, 일반적으로 사용되고 있는 내면코팅수단은 도 2에 도시된 바와 같이 1개의 노즐(5)로 세라믹을 강관의 내면에 분사하는 방식을 취하고 있으므로, 세라믹 도료의 점도가 낮은 경우에는 분사량을 조절하기가 어려워 원하는 두께로 코팅하기가 어려울 뿐만 아니라 균일한 도장을 수행하기가 힘들어서 여러 번 반복코팅을 하여야만 하는 문제점이 있다. 이로 인하여 작업능률이 저하되고 생산성이 저하된다. 또한 이러한 내면코팅수단은 1개가 설치되는 노즐의 방향이 어느 특정한 방향을 향하고 있고 강관의 회전방향이 시계방향 또는 반시계방향 중 어느 일 방향으로 정해져 있으므로, 도 3에 도시된 바와 같이 강관의 내면에 형성되어 있는 용접비드 부분에는 코팅불량이 발생하여 핀홀발생 및 녹발생의 원인이 되고 있다.In addition, since generally used inner coating means has a method of spraying ceramic on the inner surface of the steel pipe with one nozzle 5 as shown in FIG. 2, it is difficult to control the spray amount when the viscosity of the ceramic paint is low. It is difficult to coat to the desired thickness and difficult to perform uniform coating, there is a problem that must be repeatedly coated several times. This lowers work efficiency and lowers productivity. In addition, such an inner coating means is a direction in which the nozzle is installed one is directed to any particular direction and the direction of rotation of the steel pipe is determined in any one of the clockwise or counterclockwise direction, as shown in Figure 3 on the inner surface of the steel pipe Coating defects are formed in the formed weld bead portion, which causes pinholes and rusts.

본 발명은 상기한 종래 기술의 문제점을 해결하기 위하여 안출된 것으로서, 가스토치의 화염이 강관에 직접 접촉되도록 하여 강관을 회전상태로 가열함으로써 가열시간을 줄이고 생산성을 향상시킬 수 있을 뿐만 아니라 강관의 표면에 균일한 두께의 코팅을 할 수 있는 3층 폴리에틸렌과 세라믹을 강관에 코팅하는 장치 및 방법을 제공하는데 그 목적이 있다.The present invention has been made to solve the above-mentioned problems of the prior art, by heating the steel pipe in a rotary state by allowing the flame of the gas to be in direct contact with the steel pipe can reduce the heating time and improve productivity as well as the surface of the steel pipe It is an object of the present invention to provide an apparatus and method for coating three-layer polyethylene and ceramics on a steel pipe capable of coating a uniform thickness.

또한, 강관의 내면을 코팅하기 위한 내면코팅수단에 복수개의 노즐이 구비되 도록 함으로써 단 1회의 작업만으로도 원하는 두께의 코팅을 할 수 있는 3층 폴리에틸렌과 세라믹을 강관에 코팅하는 장치 및 방법을 제공하는데 그 목적이 있다.In addition, by providing a plurality of nozzles to the inner surface coating means for coating the inner surface of the steel pipe to provide a device and method for coating a three-layer polyethylene and ceramic on the steel pipe that can be coated in a desired thickness in only one operation. The purpose is.

또한, 강관의 내면을 코팅하기 위한 복수개의 노즐을 각각 다른 방향으로 향하도록 하고 강관의 회전방향에 변경을 줌으로써 강관의 내면에 형성되어 있는 용접비드 부분의 코팅을 균일하게 할 수 있는 3층 폴리에틸렌과 세라믹을 강관에 코팅하는 장치 및 방법을 제공하는데 그 목적이 있다.In addition, the three-layer polyethylene for directing the coating of the weld bead formed on the inner surface of the steel pipe by directing a plurality of nozzles for coating the inner surface of the steel pipe in different directions and by changing the rotation direction of the steel pipe; It is an object of the present invention to provide an apparatus and method for coating ceramics on steel pipes.

또한, 강관을 가열하기 위한 가스토치의 불완전 연소로 인한 그을음의 영향을 최소화하여 코팅박리의 발생을 방지할 수 있는 3층 폴리에틸렌과 세라믹을 강관에 코팅하는 장치 및 방법을 제공하는데 그 목적이 있다.It is also an object of the present invention to provide an apparatus and method for coating three-layer polyethylene and ceramics on a steel pipe, which can prevent the occurrence of coating peeling by minimizing the effects of soot caused by incomplete combustion of the gas stove for heating the steel pipe.

상기한 과제를 해결하기 위한 본 발명에 의한 3층 폴리에틸렌과 세라믹을 강관에 코팅하는 장치는 측면이 개폐가능하게 구성된 가열실 내부에 배치되고 강관이 안착된 상태에서 상기 강관을 수평하게 회전시키는 구성되는 회전수단과, 상기 가열실 내부에 배치됨과 아울러 상기 회전수단의 하측에 배치되고 상기 강관에 화염이 직접 접촉되어 상기 강관을 가열하는 가열수단과, 상기 가열수단에 의하여 가열된 강관의 표면에 분말 에폭시와 개질 폴리에틸렌 및 폴리에틸렌을 순차적으로 코팅하는 외면코팅수단과, 상기 외면코팅수단에 의하여 표면이 코팅된 강관을 냉각시키는 냉각수단과, 상기 냉각수단에 의하여 냉각된 강관의 내면에 세라믹을 코팅하기 위하여 복수개의 분사노즐이 각각 다른 방향을 향하여 세라믹을 분사하는 내면 코팅수단으로 구성된다.Apparatus for coating the three-layer polyethylene and ceramics according to the present invention for solving the above problems to the steel pipe is arranged inside the heating chamber configured to open and close the side and configured to rotate the steel pipe horizontally in the state that the steel pipe is seated A rotating means, a heating means arranged inside the heating chamber and disposed below the rotating means, the flame directly contacting the steel pipe to heat the steel pipe, and powder epoxy on the surface of the steel pipe heated by the heating means. And outer coating means for sequentially coating the modified polyethylene and polyethylene, cooling means for cooling the steel pipe coated with the surface by the outer coating means, and a plurality of coatings for coating ceramic on the inner surface of the steel pipe cooled by the cooling means. Spray nozzles are inner coating means for spraying ceramics in different directions It is sex.

또한 본 발명에 의한 3층 폴리에틸렌과 세라믹을 강관에 코팅하는 방법은 쇼트 블라스팅으로 강관의 내외면에 산재된 이물질을 제거하는 표면처리단계와, 상기 표면처리단계에서 처리된 강관을 상기 회전수단에 안착시키고 상기 가열수단으로 가열하는 예열단계와, 상기 예열된 강관의 외면에 에폭시와 개질 폴리에틸렌 및 폴리에틸렌을 순차적으로 코팅하는 외면코팅단계와, 상기 외면코팅된 강관을 냉각하는 냉각단계와, 상기 냉각된 강관의 내면에 상기 내면코팅수단으로 세라믹을 코팅하는 내면코팅단계로 구성되되, 상기 내면코팅단계는 상기 내면코팅수단의 세라믹도료 이송관이 강관의 내부로 인입될 때는 강관이 정회전되고, 상기 세라믹도료 이송관이 강관의 외부로 인출될 때는 강관이 역회전되는 것을 특징으로 한다.In addition, the method of coating the three-layer polyethylene and ceramic according to the present invention on the steel pipe is a surface treatment step of removing the foreign matter scattered on the inner and outer surfaces of the steel pipe by shot blasting, and the steel pipe treated in the surface treatment step is seated on the rotating means And a preheating step of heating the heating means, an outer coating step of sequentially coating epoxy and modified polyethylene and polyethylene on the outer surface of the preheated steel pipe, a cooling step of cooling the outer coated steel pipe, and the cooled steel pipe. It consists of an inner coating step of coating the ceramic with the inner coating means on the inner surface of the inner coating step, when the ceramic paint transfer pipe of the inner coating means is drawn into the inside of the steel pipe is the steel pipe is rotated forward, the ceramic paint When the transfer pipe is drawn out of the steel pipe is characterized in that the steel pipe is reversed.

상기와 같이 구성되는 본 발명의 3층 폴리에틸렌과 세라믹을 강관에 코팅하는 장치 및 방법은 가열수단의 화염이 강관에 직접 접촉되어 강관을 가열하므로 코팅을 하기 위하여 강관을 예열하는 시간이 단축되고 생산성을 향상시킬 수 있는 이점이 있다.The apparatus and method for coating a three-layer polyethylene and ceramics of the present invention configured as described above in a steel pipe is heated in direct contact with the flame of the heating means to heat the steel pipe is shortened the time to preheat the steel pipe for coating and productivity There is an advantage that can be improved.

또한, 가열실을 개폐가능하게 구성하므로 그을음에 의하여 강관의 코팅박리 현상을 방지할 수 있는 이점이 있다.In addition, since the heating chamber is configured to be openable and closed, there is an advantage of preventing coating peeling of the steel pipe by soot.

또한, 강관의 내면에 복수개의 분사노즐을 구비하고 상기 분사노즐의 분사방향을 각각 다르게 구성하므로, 최소한의 공정수만으로 원하는 두께만큼 코팅을 할 수 있을 뿐만 있다.In addition, since a plurality of injection nozzles are provided on the inner surface of the steel pipe and the injection directions of the injection nozzles are different from each other, the coating can be applied to a desired thickness with only a minimum number of processes.

또한, 강관의 내면을 코팅하기 위하여 강관의 회전방향을 상황에 따라 정역회전시키므로 강관의 내면에 형성된 용접비드의 주변을 완전하게 코팅할 수 있는 이점이 있다.In addition, since the direction of rotation of the steel pipe is reversed and reversed depending on the situation in order to coat the inner surface of the steel pipe, there is an advantage that can completely coat the periphery of the weld bead formed on the inner surface of the steel pipe.

이하, 본 발명에 의한 3층 폴리에틸렌과 세라믹을 강관에 코팅하는 장치 및 방법의 실시 예를 첨부된 도면을 참조하여 상세히 설명한다.Hereinafter, with reference to the accompanying drawings an embodiment of the apparatus and method for coating a three-layer polyethylene and a ceramic in a steel pipe according to the present invention will be described in detail.

도 4는 본 발명에 의한 3층 폴리에틸렌과 세라믹을 강관에 코팅하는 장치를 개략적으로 보인 평면계통도이고, 도 5는 본 발명에 의한 회전수단과 가열수단을 보인 도이다.Figure 4 is a schematic plan view showing a device for coating a three-layer polyethylene and ceramics according to the present invention on a steel pipe, Figure 5 is a view showing a rotating means and a heating means according to the present invention.

또한, 도 6은 본 발명에 의한 내면코팅방법을 개략적으로 보인 도이고, 도 7은 본 발명에 의한 강관의 내면코팅장치를 보인 도이며, 도 8은 본 발명에 의한 강관의 코팅방법을 설명하기 위한 공정도이다.In addition, Figure 6 is a schematic view showing the inner surface coating method according to the present invention, Figure 7 is a view showing the inner surface coating apparatus of the steel pipe according to the present invention, Figure 8 is to explain the coating method of the steel pipe according to the present invention. It is a process chart for.

본 발명에 의한 강관의 내외면 코팅장치는 측면이 개폐가능하게 구성된 가열실(10) 내부에 배치되고 강관(20)이 안착된 상태에서 상기 강관(20)을 수평하게 회전시키는 회전수단(30)과, 상기 가열실(10) 내부에 배치됨과 아울러 상기 회전수단(30)의 하측에 배치되어 상기 강관(20)을 가열하는 가열수단(40)과, 상기 가열수단(40)에 의하여 가열된 강관의 표면에 분말 에폭시와 개질 폴리에틸렌 및 폴리에 틸렌을 순차적으로 코팅하는 외면코팅수단(50)과, 상기 외면코팅수단(50)에 의하여 표면이 코팅된 강관을 공기나 물을 이용하여 냉각시키는 냉각수단(60)과, 상기 냉각수단(60)에 의하여 냉각된 강관의 내면에 세라믹을 코팅하는 내면코팅수단(70)으로 구성된다.The inner and outer surface coating apparatus of the steel pipe according to the present invention is disposed in the heating chamber 10 configured to open and close the side and the rotating means 30 for horizontally rotating the steel pipe 20 in a state in which the steel pipe 20 is seated. And a heating means 40 disposed inside the heating chamber 10 and disposed below the rotating means 30 to heat the steel pipe 20, and a steel pipe heated by the heating means 40. Exterior coating means 50 for sequentially coating the powder epoxy and modified polyethylene and polyethylene on the surface of the cooling means, and cooling means for cooling the steel pipe coated with the surface coating means 50 using air or water 60, and the inner surface coating means 70 for coating a ceramic on the inner surface of the steel pipe cooled by the cooling means (60).

상기 가열실(10)은 측면을 개폐가능하게 구성하여 상기 가열수단(40)에 의하여 발생된 그을음에 의하여 코팅품질이 저하되는 것을 방지할 수 있도록 한다. 상기 가열수단(40)은 후술하겠지만 가스토치로 구성되는데, 가스토치의 화염배출구(40a)로부터 나오는 화염이 불완전 연소되면 이로 인하여 그을음이 발생되는데, 이 그을음은 강관(20)의 표면에 부착되어 뒤이어 행해질 표면코팅재가 제대로 강관에 코팅되는 것을 방해하여 나중에 표면코팅재가 박리되도록 한다. 따라서 가열실(10)의 측면을 개폐가능하게 구성하면 개방된 곳으로 그을음이 빠져나가서 코팅박리 현상을 예방할 수 있다.The heating chamber 10 is configured to open and close the side to prevent the coating quality from being degraded by the soot generated by the heating means 40. The heating means 40 will be described later, but is composed of a gas torch, when the flame coming from the flame discharge port 40a of the gas torch is incompletely burned, thereby causing soot, which is attached to the surface of the steel pipe 20 to be subsequently It prevents the surface coating material from being properly coated on the steel pipe so that the surface coating material is peeled off later. Therefore, when the side of the heating chamber 10 is configured to be openable and closed, soot may escape to an open place to prevent a coating peeling phenomenon.

상기 회전수단(30)은 상기 강관(20)의 양 끝단 표면에 밀착되게 설치되는 회전롤러로 구성된다. 이러한 회전롤러는 가열실(10) 외부에 배치된 모터(M)와 연결된다.The rotating means 30 is composed of a rotating roller which is installed in close contact with both end surfaces of the steel pipe (20). This rotary roller is connected to the motor (M) disposed outside the heating chamber (10).

상기 가열수단(40)은 복수개의 화염배출구(40a)가 형성되어 상기 화염배출구(40a)로부터 화염이 분사되는 가스토치로 이루어진다. 상기 가스토치는 회전롤러에 거치된 강관의 하측에 화염배출구(40a)가 위치되도록 설치된다. 이렇게 배치된 화염배출구(40a)로부터 분사되는 화염은 회전롤러의 상측에서 회전되는 강관(20)의 저면에 직접 접촉되어 강관을 가열한다. 따라서 강관(20)을 코팅하기에 적절한 온도로 가열하기 위한 시간이 단축되고 연료소비가 줄어들어 생산성을 향상시킬 수 있을 뿐만 아니라 비용을 절감할 수 있다.The heating means 40 is formed of a plurality of flame discharge port (40a) is formed of a gas torch flame is injected from the flame discharge port (40a). The gas torch is installed so that the flame outlet (40a) is located on the lower side of the steel pipe mounted on the rotary roller. The flame sprayed from the flame discharge port 40a disposed as described above is in direct contact with the bottom surface of the steel pipe 20 that is rotated on the upper side of the rotary roller to heat the steel pipe. Therefore, the time for heating the steel pipe 20 to an appropriate temperature for coating is shortened and fuel consumption can be reduced, thereby improving productivity as well as reducing costs.

상기 외면코팅수단(50)은 종래의 분말식 코팅방법이나 압출식 코팅방법에 사용되는 수단을 사용하는 것으로, 이것은 당업자에게 널리 공지되어 있으므로 이 부분에 대해서는 설명을 생략하도록 한다.The outer coating means 50 is to use the means used in the conventional powder coating method or extrusion coating method, which is well known to those skilled in the art will be omitted for the description.

상기 내면코팅수단(70)은 세라믹도료가 저장된 세라믹 분사기(72)와, 일단이 상기 세라믹 분사기(72)에 연결되고 타단이 상기 강관(20)의 내면쪽에 인입되어 세라믹을 강관(20)의 내면쪽으로 안내하는 복수개의 세라믹도료 이송관(74)과, 상기 세라믹도료 이송관(74)의 타단에 설치되어 세라믹을 강관(20)의 내면에 분사하는 분사노즐(76)로 구성된다.The inner coating means 70 is a ceramic injector 72 in which ceramic paint is stored, and one end is connected to the ceramic injector 72 and the other end is introduced into an inner surface of the steel pipe 20 so that the ceramic is coated on the inner surface of the steel pipe 20. It consists of a plurality of ceramic paint transfer pipe (74) for guiding toward, and an injection nozzle (76) installed at the other end of the ceramic paint transfer pipe (74) for injecting ceramic on the inner surface of the steel pipe (20).

상기 세라믹 분사기(72)는 하측에 바퀴가 설치되어 이동가능하도록 구성되어 상기 세라믹도료 이송관(74)이 상기 강관(20)의 내외부로 출입될 수 있도록 하였다.The ceramic injector 72 has a wheel installed on the lower side and is configured to be movable so that the ceramic paint transfer pipe 74 may enter and exit the inside and outside of the steel pipe 20.

상기 복수개의 세라믹도료 이송관(74)은 상기 강관(20)의 내부로 인입된 각각의 타단측이 서로 다른 방향을 향하도록 절곡된다. 이렇게 절곡된 세라믹도료 이송관(74)의 타단에는 분사노즐(76)이 설치된다. 따라서, 강관(20)의 내면에 빈틈없이 세라믹도료를 분사시킬 수 있고 두꺼운 두께의 코팅층을 원하더라도 적은 공정수만으로 작업을 완료시킬 수가 있다.The plurality of ceramic paint transfer pipes 74 are bent such that the other end sides introduced into the steel pipe 20 face different directions. The spray nozzle 76 is installed at the other end of the bent ceramic coating pipe 74. Therefore, it is possible to spray ceramic paint on the inner surface of the steel pipe 20 seamlessly, and even if a thick coating layer is desired, the operation can be completed with only a small number of processes.

본 발명에 의한 강관의 코팅방법은 쇼트 블라스팅으로 강관(20)의 내외면에 산재된 이물질을 제거하는 표면처리단계(S100)와, 상기 표면처리단계(S100)에서 처리된 강관을 본 발명에 의한 회전수단(30)인 2개의 회전롤러에 안착시키고 본 발명에 의한 가열수단(40)인 가스토치로 가열하는 예열단계(S110)와, 상기 예열된 강관의 외면에 에폭시와 개질 폴리에틸렌 및 폴리에틸렌을 순차적으로 코팅하는 외면코팅단계(S120)와, 상기 외면코팅된 강관을 물이나 공기를 사용하여 냉각하는 냉각단계(S130)와, 상기 냉각된 강관의 내면에 본 발명에 의한 내면코팅수단(70)으로 세라믹을 코팅하는 내면코팅단계(S140)로 구성된다.The coating method of the steel pipe according to the present invention is a surface treatment step (S100) to remove the foreign matter scattered on the inner and outer surfaces of the steel pipe 20 by shot blasting, and the steel pipe treated in the surface treatment step (S100) according to the present invention The preheating step (S110) of seating on the two rotating rollers of the rotating means 30 and the heating means 40 according to the present invention, and the epoxy and the modified polyethylene and polyethylene on the outer surface of the preheated steel pipe sequentially Coating outer surface coating step (S120), and cooling step (S130) for cooling the outer coated steel pipe using water or air, and the inner surface coating means 70 according to the present invention on the inner surface of the cooled steel pipe ceramic Consists of the inner coating step of coating (S140).

상기 표면처리단계(S100)는 쇼트 블라스팅에 의하여 강관의 내외면에서 녹 또는 기름성분 등을 제거하여 나중에 코팅되는 코팅재가 박리되는 것을 방지할 수 있도록 하는 공정이다.The surface treatment step (S100) is a process for removing rust or oil from the inner and outer surfaces of the steel pipe by shot blasting to prevent peeling of the coating material coated later.

상기 예열단계(S110)는 깨끗하게 표면처리가 된 강관에 에폭시와 개질 폴리에틸렌 및 폴리에틸렌이 표면온도에 의하여 견고하게 코팅될 수 있도록 강관을 원하는 온도만큼 끌어올리는 공정이다. 이러한 공정을 수행하기 위해서 본 발명에 의한 가스토치를 사용하는데, 가스토치의 화염배출구(40a)에서 나오는 화염이 강관의 표면에 직접 접촉된다.The preheating step (S110) is a process of raising the steel pipe to a desired temperature so that the epoxy and the modified polyethylene and polyethylene on the clean surface treated steel pipe can be firmly coated by the surface temperature. In order to perform this process, the gas torch according to the present invention is used, and the flame from the flame outlet 40a of the gas torch is in direct contact with the surface of the steel pipe.

상기 외면코팅단계(S120)는 강관(20)의 표면에 1차적으로 분말 에폭시를 코팅하고, 그 에폭시 위에 개질 폴리에틸렌을 코팅하며, 그 개질 폴리에틸렌 위에 폴리에틸렌을 코팅하는 공정이다. 이때, 상기 개질 폴리에틸렌은 폴리에틸렌층의 접착제로서의 역할을 수행한다.The outer coating step (S120) is a process of first coating a powder epoxy on the surface of the steel pipe 20, coating the modified polyethylene on the epoxy, and coating the polyethylene on the modified polyethylene. At this time, the modified polyethylene serves as an adhesive of the polyethylene layer.

상기 내면코팅단계(S140)는 상기 내면코팅수단(70)의 세라믹도료 이송관(74)이 강관의 내부로 인입될 때는 강관(20)의 하측에 배치된 회전롤러가 정회전되어 회전롤러의 상측에 배치된 강관(20)이 정회전되고, 상기 세라믹도료 이송관(74)이 강관(20)의 외부로 인출될 때는 강관(20)의 하측에 배치된 회전롤러가 역회전되어 회전롤러의 상측에 배치된 강관(20)이 역회전된다. 따라서, 강관(20)의 내부에 용접비드(20a)가 형성되어 있을 때도 도 7에 도시된 바와 같이 용접비드(20a)의 주변에 균일하게 세라믹도료를 코팅할 수 있다.In the inner coating step (S140), when the ceramic paint transfer pipe 74 of the inner coating means 70 is drawn into the inside of the steel pipe, the rotating roller disposed below the steel pipe 20 is rotated forward to the upper side of the rotating roller. Steel pipe 20 disposed in the forward rotation, and when the ceramic paint transfer pipe 74 is drawn out of the steel pipe 20, the rotary roller disposed below the steel pipe 20 is rotated in reverse to the upper side of the rotary roller Steel pipe 20 disposed in the reverse rotation. Therefore, even when the welding bead 20a is formed inside the steel pipe 20, the ceramic coating may be uniformly coated around the welding bead 20a as shown in FIG. 7.

도 1은 종래기술에 따른 강관의 가열과정을 단순하게 보인 개략도.1 is a schematic view showing a simple heating process of the steel pipe according to the prior art.

도 2는 종래기술에 따른 강관의 내면코팅수단을 단순하게 보인 도.Figure 2 shows simply the inner coating means of the steel pipe according to the prior art.

도 3은 종래기술에 따른 강관의 내면코팅모습을 보인 도.Figure 3 is a view showing the inner coating appearance of the steel pipe according to the prior art.

도 4는 본 발명에 의한 3층 폴리에틸렌과 세라믹을 강관에 코팅하는 장치를 개략적으로 보인 평면계통도.Figure 4 is a schematic plan view showing a device for coating a three-layer polyethylene and ceramics steel pipe according to the present invention.

도 5는 본 발명에 의한 회전수단과 가열수단을 보인 도.5 is a view showing a rotating means and a heating means according to the present invention.

도 6은 본 발명에 의한 내면코팅방법을 개략적으로 보인 도.Figure 6 schematically shows an inner coating method according to the present invention.

도 7은 본 발명에 의한 강관의 내면코팅장치를 보인 도.7 is a view showing an inner surface coating apparatus of the steel pipe according to the present invention.

도 8은 본 발명에 의한 강관의 코팅방법을 설명하기 위한 공정도.8 is a process chart for explaining the coating method of the steel pipe according to the present invention.

<도면의 주요 부분에 관한 부호의 설명><Explanation of symbols on main parts of the drawings>

10: 가열실 20: 강관10: heating chamber 20: steel pipe

20a: 용접비드 30: 회전수단20a: welding bead 30: rotating means

40: 가열수단 40a: 화염배출구40: heating means 40a: flame outlet

50: 외면코팅수단 60: 냉각수단50: outer coating means 60: cooling means

70: 내면코팅수단 72: 세라믹 분사기70: inner coating means 72: ceramic injector

74: 세라믹도료 이송관 76: 분사노즐74: ceramic paint transfer pipe 76: spray nozzle

Claims (4)

측면이 개폐가능하게 구성된 가열실(10) 내부에 배치되고, 강관(20)이 안착된 상태에서 상기 강관(20)을 수평하게 회전시키는 회전수단(30)과;A rotation means (30) disposed in a heating chamber (10) configured to open and close at a side thereof, and horizontally rotating the steel pipe (20) in a state in which the steel pipe (20) is seated; 상기 가열실(10) 내부에 배치됨과 아울러 상기 회전수단(30)의 하측에 배치되어 상기 강관(20)을 가열하는 가열수단(40)과;A heating means (40) disposed inside the heating chamber (10) and disposed below the rotating means (30) to heat the steel pipe (20); 상기 가열수단(40)에 의하여 가열된 강관의 표면에 에폭시와 개질 폴리에틸렌 및 폴리에틸렌을 순차적으로 코팅하는 외면코팅수단(50)과; An outer coating means 50 for sequentially coating epoxy, modified polyethylene and polyethylene on the surface of the steel pipe heated by the heating means 40; 상기 외면코팅수단(50)에 의하여 표면이 코팅된 강관을 냉각시키는 냉각수단(60)과; Cooling means (60) for cooling the steel pipe coated with the surface by the outer coating means (50); 상기 냉각수단(60)에 의하여 냉각된 강관의 내면에 세라믹을 코팅하는 내면코팅수단(70);으로 구성된 것을 특징으로 하는 3층 폴리에틸렌과 세라믹을 강관에 코팅하는 장치.Apparatus for coating three-layer polyethylene and ceramics on the steel pipe, characterized in that consisting of; inner surface coating means for coating a ceramic on the inner surface of the steel pipe cooled by the cooling means (60). 청구항 1에 있어서,The method according to claim 1, 상기 가열수단(40)은 상기 회전수단(30)에 의하여 회전하는 강관(30)의 하단부에 복수개의 화염배출구가 형성되어 상기 화염배출구(40a)로부터 분사된 화염의 접촉에 의하여 강관(20)을 가열시키는 가스토치로 이루어지는 것을 특징으로 하는 3층 폴리에틸렌과 세라믹을 강관에 코팅하는 장치.The heating means 40 has a plurality of flame outlets are formed at the lower end of the steel pipe 30 to be rotated by the rotating means 30 to contact the steel pipe 20 by the contact of the flame sprayed from the flame outlet (40a) Apparatus for coating three-layer polyethylene and ceramics on a steel pipe, characterized in that the gas torch to be heated. 청구항 1에 있어서,The method according to claim 1, 상기 내면코팅수단(70)은 세라믹도료가 저장된 세라믹 분사기와(72)와;The inner coating means 70 includes a ceramic injector 72 in which ceramic paint is stored; 일단이 상기 세라믹 분사기(72)에 연결되고 타단이 상기 강관(20)의 내면쪽에 인입되어 세라믹도료를 강관(20)의 내면쪽으로 안내하는 복수개의 세라믹도료 이송관(74)과;A plurality of ceramic paint transfer pipes (74) having one end connected to the ceramic injector (72) and the other end introduced into the inner surface of the steel pipe (20) to guide the ceramic paint toward the inner surface of the steel pipe (20); 상기 복수개의 세라믹도료 이송관(74) 타단에 각각 설치되어 세라믹도료를 강관(20)의 내면에 분사하는 분사노즐(76);로 구성된 것을 특징으로 하는 3층 폴리에틸렌과 세라믹을 강관에 코팅하는 장치.And a spray nozzle (76) installed at the other ends of the plurality of ceramic paint transfer pipes (74) to spray ceramic paint on the inner surface of the steel pipe (20). . 쇼트 블라스팅으로 강관(20)의 내외면에 산재된 이물질을 제거하는 표면처리단계(S100)와;A surface treatment step (S100) of removing foreign matters scattered on the inner and outer surfaces of the steel pipe 20 by shot blasting; 상기 표면처리단계(S100)에서 처리된 강관을 측면이 개폐가능하게 구성되는 가열실(10) 내부에 배치된 회전수단(30)에 안착시키고, 복수개의 화염배출구(40a)가 형성되어 상기 화염배출구(40a)로부터 분사된 화염의 접촉에 의하여 강관(20)을 가열시키는 가스토치(20)로 상기 회전수단(30)에 의하여 회전하는 강관(20)을 가열하는 예열단계(S110)와;The steel pipe treated in the surface treatment step (S100) is seated on the rotating means 30 disposed inside the heating chamber 10 configured to open and close the side, and a plurality of flame outlets 40a are formed to form the flame outlet. A preheating step (S110) of heating the steel pipe (20) rotated by the rotating means (30) with a gas torch (20) for heating the steel pipe (20) by the contact of the flame sprayed from (40a); 상기 예열된 강관의 외면에 분말 에폭시와 개질 폴리에틸렌 및 폴리에틸렌을 순차적으로 코팅하는 외면코팅단계(S120)와;An outer surface coating step (S120) of sequentially coating powder epoxy, modified polyethylene, and polyethylene on the outer surface of the preheated steel pipe; 상기 외면코팅된 강관을 냉각하는 냉각단계(S130)와;Cooling step (S130) for cooling the outer coated steel pipe; 세라믹도료가 저장된 세라믹 분사기(72)와, 일단이 상기 세라믹 분사기(72)에 연결되고 타단이 상기 강관(20)의 내면쪽에 인입되어 세라믹도료를 강관(20)의 내면쪽으로 안내하는 복수개의 세라믹도료 이송관(74)과, 상기 복수개의 세라믹도료 이송관(74) 타단에 각각 설치되어 세라믹도료를 강관(20)의 내면에 분사하는 분사노즐(76)로 구성된 내면코팅수단(70)을 사용하여 상기 냉각된 강관의 내면에 세라믹도료를 코팅하는 내면코팅단계(S140);으로 구성되되,The ceramic injector 72, the ceramic paint is stored and one end is connected to the ceramic injector 72, the other end is introduced into the inner surface of the steel pipe 20, a plurality of ceramic paints to guide the ceramic paint toward the inner surface of the steel pipe 20 By using the inner coating means 70 consisting of a transfer pipe 74 and the injection nozzles 76 which are respectively provided at the other ends of the plurality of ceramic paint transfer pipes 74 and spray the ceramic paint on the inner surface of the steel pipe 20. Consisting of the inner surface coating step (S140) for coating a ceramic paint on the inner surface of the cooled steel pipe, 상기 내면코팅단계(S140)는 상기 내면코팅수단(70)의 세라믹도료 이송관(74)이 강관(20)의 내부로 인입될 때는 강관이 정회전되고, 상기 세라믹도료 이송관(74)이 강관(20)의 외부로 인출될 때는 강관(20)이 역회전되는 것을 특징으로 하는 3층 폴리에틸렌과 세라믹을 강관에 코팅하는 방법.The inner coating step (S140) is the steel pipe is rotated forward when the ceramic paint transfer pipe 74 of the inner coating means 70 is introduced into the steel pipe 20, the ceramic paint transfer pipe 74 is a steel pipe When drawn to the outside of the 20, the steel pipe 20 is a method of coating the steel pipe with a three-layer polyethylene and ceramics, characterized in that the reverse rotation.
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