KR200211589Y1 - coil for corrugated steel pipe of coating double PE sheet and apparatus thereof - Google Patents

Abstract

It has high external pressure strength, durability, oxidation resistance, and workability, so that high density polyethylene is double coated on the inner and outer sides of the galvanized steel coil to form spiral corrugated steel pipes that are used for various purposes such as wastewater pipes and road drainage. It is to be handled.

The present invention provides a double coating sheet layer comprising a first coating layer imparting a polar group to a high density polyethylene and a second coating layer of polished high density polyethylene bonded to the outside of the first coating layer by fusion welding on the inner and outer surfaces of the galvanized steel coil. It is coated.

As a result, double coating of high-density polyethylene on the inner and outer surfaces of the galvanized steel coils formed into spiral corrugated steel pipes increases strength, corrosion resistance, and oxidation resistance, thereby greatly extending the service life of the spiral corrugated steel pipes. . By minimizing the friction coefficient of the inner circumference of the spiral corrugated steel pipe, the resistance factor of the fluid can be removed to prevent the deterioration of the hydraulic characteristics compared to the P.E pipe. The process of coating the double coated sheet on the inner and outer sides of the galvanized steel coil and the process of forming the coated galvanized steel coil into spiral corrugated steel pipe are completely separated. It has the advantage that the adhesiveness of the coated sheet can be increased to improve its reliability.

Description

Coil for corrugated steel pipe of coating double PE sheet and apparatus

The present invention relates to a coil for corrugated steel pipe coated with a double sheet and a device for coating the same.

More specifically, it is excellent in high external pressure strength, durability, oxidation resistance, and workability, so that the galvanized steel coil can be formed to form a spiral corrugated steel pipe that is used for various purposes such as wastewater, wastewater pipe, and road drainage. The present invention relates to a coil for corrugated steel pipe coated with a double sheet of double density coated with high density polyethylene on the inner and outer sides thereof, and an apparatus for coating the same.

In general, the fume pipe of the concrete material used in roads, harbors, sewage treatment plants, etc. is inconvenient to transport and handle due to its weight and volume increase. In addition, heavy equipment input is required during construction, and workability due to the installation and dismantling of the formwork is remarkably difficult to meet the construction period, and construction is limited in winter due to freezing of foundation cement and joints. The longer the period has a problem that the overall construction cost increases.

In addition, while the fume pipe of the concrete material is excellent in strength, there is a problem that is easily cracked or destroyed by the impact applied from the outside during transportation and construction.

Therefore, as shown in Figure 1, excellent external pressure strength, durability, workability, etc., the waveform of forming a spiral bent portion on the surface by using a galvanized steel coil as a general drain pipe, heavily polluted living sewer pipe, factory drain pipe, etc. Steel pipes are used.

However, when the corrugated steel pipe of the above galvanized steel sheet is used as a wastewater, wastewater pipe, domestic sewage pipe, etc., the corrugated steel pipe is corroded and oxidized due to the toxicity of sewage, wastewater, and living sewage. As a result, the service life is greatly shortened.

In view of the above problems, by coating a predetermined powder on the surface of the corrugated steel pipe to be spiral formed by heat fusion, the corrugated steel pipe has corrosion resistance and oxidation resistance.

However, in the coating method using powder, the thickness of the coating layer laminated on the corrugated steel pipe and the acid is different, so the reliability of the product is lowered and the cost of the powder is increased when the thickness of the coating layer is increased. You have a problem.

Therefore, an object of the present invention, by coating a high-density polyethylene on the inner and outer sides of the galvanized steel coil formed into a spiral corrugated steel pipe in duplicate, the strength, corrosion resistance, oxidation resistance is enhanced to extend the service life of the spiral corrugated steel pipe The present invention provides a coil for corrugated steel pipe in which a single sheet is coated so as to extend significantly, and an apparatus for covering the same.

Another object of the present invention is to eliminate the resistance factor of the fluid by minimizing the friction coefficient of the inner circumference of the spiral corrugated steel pipe to prevent the deterioration of the hydraulic characteristics compared to the PE pipe. The present invention provides a coil for corrugated steel pipe in which a sheet is double coated and a device for covering the same.

Another object of the present invention is to completely separate the work process of coating the double coated sheet on the inner and outer sides of the galvanized steel coil and the work process of forming the coated galvanized steel coil into spiral corrugated steel pipe. Accordingly, to provide a coil for a corrugated steel pipe which is coated with a double sheet to be able to improve the adhesion of the coated sheet to the galvanized steel coil to improve its reliability, and a device for coating the same.

1 is a schematic diagram of a corrugated steel pipe formed of a galvanized steel sheet according to the prior art,

Figure 2 is a schematic internal cross-sectional view of a corrugated steel pipe is coated with a double sheet formed by the present invention,

Figure 3 is a schematic diagram of a device for forming a coil for corrugated steel pipe is covered with a double sheet in accordance with the present invention,

4 is a plan view of FIG.

FIG. 5 is a flowchart showing a work procedure for forming a coil for a corrugated steel pipe in which a sheet is double coated by the present invention.

* Explanation of symbols used in the main part of the drawing

One; Rotater

2; Galvanized steel coil

3; Uncoiler

4; syringe

5,6,7,8,10,11,22; roller

9; High frequency induction heater

12,13; Film uncoiler

14; Cover Molding Machine

15; Chiller

16; Recoiler

17; Corrugated Steel Pipe

20; Cover sheet material

The object of the present invention described above is that the inner and outer sides of the galvanized steel coil have a double covering sheet layer composed of a first coating layer imparting a polar group to the high density polyethylene and a second coating layer of polished high density polyethylene bonded to the outside of the first coating layer. It is achieved by providing a coil for a corrugated steel pipe coated with a double sheet, characterized in that the sheet is coated by fusion welding.

An object of the present invention described above, the adhesiveness of the uncoiler coiled galvanized steel coil is retractably wound during its rotation, and the coated sheet material coated on the inner and outer sides of the galvanized steel coil conveyed from the uncoiler A washing machine for removing impurities from the surface of the galvanized steel coil by rolling the brush to increase the pressure, a high frequency induction heating device for heating the galvanized steel coil passing through the washing machine to a predetermined temperature, and the high frequency induction heating device. The double-compressed coated sheet material of the high density polyethylene material drawn from the film uncoiler formed on the upper and lower sides of the galvanized steel coil, which is heated and conveyed to a predetermined temperature by fusion by rolling on the inner and outer sides of the galvanized steel coil. In and out of the galvanized steel coil by the coating molding machine and the coating molding machine It provides a device for forming a coil for a corrugated steel pipe is coated with a double sheet, characterized in that it comprises a recoil to transfer and winding the coil for the corrugated steel pipe coated with a double coated surface as a coating sheet material. Is achieved by.

According to a preferred embodiment, the thickness of the first coating layer is in the range of 0.1 mm to 0.4 mm, and the thickness of the second coating layer is in the range of 0.1 mm to 0.6 mm.

According to a preferred embodiment, the double coated sheet layer coated on the galvanized steel coil is coated by any one of the inner and outer surfaces of the spiral corrugated steel pipe coil by fusion welding.

According to a preferred embodiment, there is provided a separate cooling device provided between the coating molding machine and the recoiler to cool the coil for corrugated steel pipe, wherein the coating sheet material is double coated on the inner and outer sides.

According to a preferred embodiment, the double covering sheet layer composed of the first covering layer and the second covering layer is coated on the inner and outer sides of the steel sheet coil by fusion welding.

Hereinafter, preferred embodiments according to the present invention will be described with reference to the accompanying drawings, which are intended to be described in detail to be easily carried out by those skilled in the art in order to facilitate the understanding of the present disclosure. This does not mean that the technical scope herein is limited.

As shown in FIGS. 2 to 5, an uncoiler 3 and an uncoiler 3 in which a galvanized steel coil 2 is retractably wound when the rotator rotates thereof. It is deposited on the surface of the galvanized steel coil 2 so as to increase the adhesiveness of the double-compression coated sheet material 20 of the high-density polyethylene material coated on the inner and outer sides of the galvanized steel coil 2 conveyed from The washing machine 4 removes impurities such as sludge and scale by rolling the brushes formed on the outer circumference of the pair of rollers 5 and 6, and the impurities are removed through the washing machine 4. It is provided with a high frequency induction heating system (9) for heating the galvanized steel sheet coil (2) in a range of about 120 ℃ to 150 ℃ by a pair of rollers 7, 8 friction drive .

In addition, the rotator is rotatably mounted on the upper and lower sides of the galvanized steel coil 2 heated to a predetermined temperature through the above-described high frequency induction heating apparatus 9 so that the coated sheet material 20 having a film shape is provided. A pair of film uncoilers (12, 13) and a coated sheet material (20) withdrawn from the film uncoilers (12, 13) are wound on the inner and outer sides of the galvanized steel coil (2). The coating sheet 14 and the coating sheet 14 which are coated by fusion by continuous friction driving of several rollers 10 and 11, and the inner and outer surfaces of the galvanized steel coil 2 are coated sheet materials. Rico winding the cooling device 15 (coolant tank) for cooling the corrugated steel pipe coil 17 coated with a double coating 20, and the coil 17 for corrugated steel pipe passing through the cooling device 15. And a reel 16 is provided.

At this time, the coated sheet material 20 coated on the inner and outer sides of the above-described galvanized steel sheet coil 2 is composed of a first coating layer 18 (modified HDPE; high density polyethylene) having a polar group added thereto. It consists of a second coating layer 19 (general HDPE) of gloss (UV) treated high density polyethylene bonded to the outside of the first coating layer 18.

Further, preferably, the thickness of the first coating layer 18 described above is in the range of 0.1 mm to 0.4 mm, more preferably in the range of 0.1 mm to 0.2 mm.

Preferably, the thickness of the above-mentioned second coating layer 19 is in the range of 0.1 mm to 0.6 mm, more preferably in the range of 0.1 mm to 0.4 mm.

Reference numeral 21 denotes a roller conveyor during transfer of the corrugated steel pipe coil 17 coated with the double coated sheet material 20 on the inner and outer sides of the galvanized steel coil 2, and 22 is the galvanized steel coil 2 It is a guide roller which prevents the transfer out of a fixed position during the transfer from the uncoiler (3) to the washing machine (4).

Hereinafter, with reference to the accompanying drawings, a method of forming a coil for corrugated steel pipe is covered with a double sheet of the present invention in detail as follows.

As shown in FIGS. 2 to 5, the galvanized steel coil 2 wound on the above-described uncoiler 3 is released due to the rotation of the rotator 1 and is caused by the friction driving of the pair of rollers 22. It is conveyed to the washer 4 side according to the guidance.

In the above-described washing machine (4), the rolling of the brush mounted on the outer periphery of the roller (5, 6) so as to increase the adhesiveness of the coated sheet material 20 coated on the inner and outer sides of the above-described galvanized steel coil (2) As a result, impurities such as sludge and scale deposited on the surface of the galvanized steel coil 2 are removed by washing (see S10).

The galvanized steel coil 2 passing through the above-described washing machine 4 is subjected to friction driving of the pair of rollers 7, 8 of the high frequency induction heating apparatus 9 for a predetermined time in the range of about 120 to 150 ° C. It is heated and preheated (refer to S20).

In the above-mentioned coating molding machine 14, the coating sheet material 20 of high density polyethylene is double coated on the inner and outer sides of the galvanized steel coil 2 which is heated after being heated to a predetermined temperature.

That is, the first coating layer 18 and the second coating layer 19 released from the film uncoilers 12 and 13 rotatably provided with their rotators on the upper and lower sides of the galvanized steel coil 2 transported in the horizontal direction. The double coated sheet material 20 bonded together is welded to the inner and outer sides of the galvanized steel sheet coil 2 by pressurization due to continuous friction driving of several rollers 10 and 11 installed to coaxially compress the predetermined thickness. Can be coated (see S30).

In this case, preferably, the thickness of the first coating layer 18 is in the range of 0.1 mm to 0.2 mm, and the thickness of the second coating layer 19 is in the range of 0.1 mm to 0.4 mm.

In the above-described cooling device 15, the corrugated steel pipe coil 17, in which the high-density polyethylene coated sheet material 20 is double-coated on the inner and outer surfaces of the galvanized steel coil 2, is cooled while passing through the cooling water ( See S40).

At this time, the corrugated steel pipe coil 17 having the double coated sheet material 20 coated on its inner and outer sides by the above-described coating molding machine 14 may be cooled while passing through the roller conveyor 21.

The coil 17 for corrugated steel pipe cooled by the above-mentioned cooling device 15 is wound on the recoiler 16 so that the spiral corrugated steel pipe can be easily formed in a subsequent process (see S50).

On the other hand, although not shown in the drawings, the coating sheet material 20 to be coated on the inner and outer sides of the steel sheet coil or the above-described galvanized steel coil 2 is triple, quadruple or more to bond the coating treatment Of course, it can be determined that the technical spirit and spirit of the present invention are easily modified in the field.

As described above, according to a preferred embodiment, by coating the high-density polyethylene on the inner and outer sides of the galvanized steel coil formed into a spiral corrugated steel pipe in duplicate, the strength, corrosion resistance, oxidation resistance is enhanced to The service life can be extended significantly.

On the other hand, by minimizing the friction coefficient of the inner circumference of the spiral corrugated steel pipe to remove the resistance factor of the fluid to prevent degradation of the hydraulic characteristics compared to the P.E pipe.

On the other hand, galvanized steel sheet by completely separating the work process of coating the double coated sheet on the inner and outer sides of the galvanized steel coil and the work process of forming the coated galvanized steel coil into spiral corrugated steel pipe It has the advantage that the adhesion of the coated sheet to the coil can be increased to improve its reliability.

Claims (4)

A double coating sheet layer comprising a first coating layer imparting a polar group to the high density polyethylene and a second coating layer of polished high density polyethylene bonded to the outside of the first coating layer is coated on the inner and outer surfaces of the galvanized steel coil by fusion welding. A coil for corrugated steel pipe coated with a double sheet. The corrugated steel pipe coil of claim 1, wherein the thickness of the first coating layer is in the range of 0.1 mm to 0.4 mm, and the thickness of the second coating layer is in the range of 0.1 mm to 0.6 mm. . The corrugated steel pipe coil of claim 1, wherein the double coated sheet layer coated on the galvanized steel coil is coated on the inner and outer surfaces of the spiral corrugated steel pipe by fusion welding. . 2. The corrugated steel pipe coil of claim 1, wherein the double cover sheet layer formed of the first cover layer and the second cover layer is coated on the inner and outer surfaces of the steel sheet coil by fusion welding. .