KR100999537B1 - Internal coating device of steel pipe or ductile cast iron pipe - Google Patents

Abstract

The present invention relates to a powder coating device for the inner surface of a steel pipe or cast iron pipe, and more particularly, to a powder pipe that is inserted into the steel pipe or cast iron pipe and supplies powder coating from the outside; In the apparatus for coating the inner surface of the steel pipe or cast iron pipe, comprising: a nozzle for injecting the first water cooling pipe and the first water cooling pipe to accommodate the supply pipe inside and the cooling water supplied from the outside; It is further provided with a second water cooling pipe which is discharged to the outside while the cooling water flowing from the first water cooling pipe flows, the second water cooling pipe has a shape in which a plurality of pipes having different cross-sections are connected in stages to prevent sagging. The cross-sectional area is reduced toward the nozzle direction, it is characterized by a high temperature of 200 ℃ or more Since the water pipe is inserted into the steel pipe or the cast iron pipe for a long time, the water-cooling effect is doubled, so powder powder coating does not melt or clump, and the nozzle is well sprayed and the long supply pipe is formed in multiple stages. The deflection can be minimized and a roller can be used to prevent the nozzle from directly colliding inside the steel pipe or cast iron pipe.

Steel pipe, cast iron pipe, powder, coating, water cooling, cooling, nozzle, roller, ring, center

Description

Internal coating device of steel pipe or ductile cast iron pipe}

The present invention relates to a powder coating device for the inner surface of a steel pipe or cast iron pipe, and more particularly to a powder coating device for the inner surface of a steel pipe or cast iron pipe coating the inner surface by heating the steel pipe or cast iron pipe and spraying powder powder in the inner surface thereof. will be.

Cast iron pipes are mainly used for the transportation of water and sewage pipes and other liquids, and most of them are mass produced by centrifugal casting.

And because the cast iron pipe manufactured by the centrifugal casting method is embedded underground, the inner and outer peripheral surfaces are coated to withstand various external environments.

The coating used for the coating is made of a liquid or powder, and conventionally, a liquid bitumen or a BPA (bisphenol A) type or a BPF type powder (powder) paint is generally used.

At this time, the method of coating the powder-type epoxy resin powder coating on the inner surface of the cast iron pipe first pre-treat the surface of the cast iron pipe so that the paint is attached well, and preheat the cast iron pipe to a high frequency method using a gas oven or an induction coil to about 200 ℃ ~ 230 ℃.

Next, when the preheated cast iron pipe is rotated at a constant speed and the injection nozzle is inserted therein to spray the powder coating to form a certain thickness and adhered to the surface of the cast iron pipe, the powder coating is coated by melting to form a coating film, After it hardens.

In this process, conventionally, when painting the inner surface of the steel pipe or cast iron pipe was inserted into the elongated feed pipe equipped with a nozzle into the cast iron pipe was performed powder coating spray operation.

At this time, the powder powder (epoxy resin) in the form of powder supplied from the outside through the supply pipe is the temperature rises when the feed pipe is inserted into a heated steel pipe or cast iron pipe, thereby melting before the powder coating is sprayed through the nozzle Or high viscosity, it is difficult to obtain a good film quality because the nozzle is clogged or difficult to uniformly spray.

In addition, when the long steel pipe or cast iron pipe inner surface is painted, the length of the supply pipe should also be long, in this case, the longer the supply pipe, there is a risk that the deflection occurs and collide with the inner surface of the pipe.

The present invention has been made to solve the above problems and an object of the present invention is to provide a powder coating device for the inner surface of the steel pipe or cast iron pipe to cool the supply pipe for spraying powder coating on the inner surface of the steel pipe or cast iron pipe.

Another object is to provide a powder coating device for the inner surface of the steel pipe or cast iron pipe to prevent the sagging of the supply pipe when painting the long steel pipe or cast iron pipe inner surface.

The present invention for achieving the above object is composed of a supply pipe inserted into the steel pipe or cast iron pipe and supplies the powder coating from the outside, and a nozzle for spraying the powder coating on the inner surface of the heated steel pipe or cast iron pipe provided at the end of the supply pipe In the apparatus for painting the inner surface of the steel pipe or cast iron pipe, the outside of the supply pipe accommodates the supply pipe inside and the first water cooling pipe flowing the cooling water supplied from the outside, and the first water cooling pipe inside the first water cooling pipe A second water cooling tube is further provided to the outside while flowing the cooling water flowing from the second water cooling tube, the second water cooling tube has a shape in which a plurality of pipes having different cross sectional areas are connected to each other so as to prevent sag, and the cross-sectional area toward the nozzle direction is increased. It is characterized by shrinking.

Preferably, the first water cooling pipe is provided with a cooling water inlet through which coolant is introduced from the outside on one side, and a water flow hole through which the cooling water introduced is introduced to the second water cooling tube is formed on the other side, and the second water cooling The pipe is characterized in that the cooling water outlet for discharging the cooling water introduced through the water supply hole on one side.

Preferably, one side of the second water cooling pipe is characterized in that the height adjusting means for adjusting the height by moving the second water cooling pipe up and down is provided.

Preferably, the height adjustment means is coupled to the lifting body coupled to the outer peripheral surface of the second water cooling pipe, the support ring inserted between the second water cooling pipe and the lifting body, and the servo motor for driving the lifting body up and down Characterized in that consists of.

Preferably, the outer side of the height adjusting means is coupled to the height adjusting means and the support body is accommodated therein, the center control ring is coupled to the outer peripheral surface of the second water cooling tube accommodated in the support, and the support Threaded through and coupled to the central adjusting means consisting of a plurality of central adjusting bolts coupled to the central adjusting ring is characterized in that it is further provided.

The effect of the present invention by the configuration as described above is that the powder is powder-like powder is melted or agglomerated because there is an effect that the water is double-cooled even after a long time work by inserting the supply pipe inside the high-temperature steel pipe or cast iron pipe that is 200 ℃ or more And spray through the nozzle.

In addition, it is possible to minimize the deflection by forming a long supply pipe in multiple stages, it is possible to prevent the nozzle from directly impacting the inner surface of the steel pipe or cast iron pipe by having a roller.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention. The following description and the accompanying drawings are presented for the overall understanding of the present invention, and thus the technical scope of the present invention is not limited thereto. And a detailed description of known configurations and functions that may unnecessarily obscure the subject matter of the present invention will be omitted.

1 is a cross-sectional view of a powder coating device of the inner surface of a steel pipe or cast iron pipe according to an embodiment of the present invention.

According to the present invention, a pipe-shaped first water cooling pipe (30) and a first water cooling pipe (30) are disposed while surrounding the outer circumferential surface of the supply pipe (10) in a coating device comprising a nozzle (20) and a supply pipe (10). It consists of a second water cooling tube (40) surrounding.

In the present invention, the supply pipe 10 has a tube (type) for supplying a powder coating (epoxy resin, etc.) in the form of powder from the outside and the nozzle 20 that can spray the powder coating to the end of the supply pipe (10) It is provided.

First, the first water cooling pipe 30 will be described.

The first water cooling pipe 30 is formed in a pipe shape and the supply pipe 10 is accommodated and disposed therein, that is, one side, that is, the cooling water inlet 32 to which the cooling water is supplied from the outside to the side opposite to the nozzle 20. Is formed, the coolant flowing through the coolant inlet 32 flows into the first water cooling tube (30).

The other side of the first water cooling pipe 30, that is, the nozzle 20 has a water supply hole 34 formed on an outer circumferential surface thereof through which cooling water can flow out, and the water supply hole 34 has the first water cooling. It is preferable that a plurality of tubes 30 are formed at regular intervals in the circumferential direction.

Next, the second water cooling pipe 40 will be described.

The second water cooling pipe 40 also has a pipe shape and is disposed to accommodate the first water cooling pipe 30 therein, and the coolant passing through the first water cooling pipe 30 passes through the water supply hole 34. It exits through and flows inside the second water cooling tube 40. In other words, one side of the second water cooling pipe 40, that is, a cooling water outlet 42 is formed on the opposite side to the nozzle 20 to discharge the cooling water flowing therein.

For reference, the cooling water discharged through the cooling water outlet 42 is cooled again while being circulated and re-introduced into the cooling water inlet 32.

On the other hand, the second water cooling pipe 40 has a shape in which a plurality of pipes having different cross-sectional areas are connected to each other, which is the length of the first water cooling pipe 30 and the second water cooling pipe 40 when the steel pipe or cast iron pipe is lengthened Since the supply pipe 10 and the nozzle 20 sag down because the weight is also increased because of this is to prevent this.

A plurality of pipes having different cross-sectional areas are connected by the connector 44 to form a stepped shape, and the cross-sectional area thereof becomes smaller toward the nozzle 20.

It is preferable to connect the pipes having two or three different cross-sectional areas with the connector 44.

Here, both sides of the first water cooling pipe 30 and the second water cooling pipe 40 are sealed using a cap 80 to prevent the cooling water from leaking.

In the present invention, one side of the second water cooling pipe 40 may be further provided with a height adjusting means 50 for elevating the supply pipe 10, the first water cooling pipe, the second water cooling pipe 40 up and down.

The height adjusting means 50 is driven by the servo motor 56 to move up and down, the lifting body 52, the second water cooling pipe 40 is coupled through, and the lifting body 52 and the second Inserted and coupled between the water cooling pipe 40 may be composed of a support ring 54 for supporting the second water cooling pipe 40 in the lifting body 52, the support ring 54 is slightly Rubbers having elastic force are suitable.

At one side of the height adjusting means 50, the supply pipe 10, the first water cooling pipe 30, the second water cooling pipe 40 can be adjusted in the center of the inner surface of the steel pipe or cast iron pipe means for adjusting the top, bottom, left and right ( 60 is provided, the center adjusting means 60 is coupled to one side of the lifting body 52 and the support 62 is inserted and coupled to the second water cooling tube 40 therein, and the support 62 A ring-shaped center control ring 64 coupled to the outer circumferential surface of the second water cooling tube 40 inserted therein, is screwed through the support 62, the end is coupled to the center control ring 64 It is composed of a plurality of central adjustment bolt (66).

Four center adjusting bolts 66 are respectively installed on the upper, lower, left, and right sides of the support 62 to separately tighten or loosen each of the second water cooling pipes 40 to adjust a predetermined distance up, down, left, and right.

Preferably, the nozzle 20 may be further provided with a roller 70 rotatably coupled to prevent the nozzle 20 from colliding with the inner wall of the steel pipe or cast iron pipe by the deflection of the supply pipe 10. will be.

Hereinafter, the operation of the present invention will be briefly described with reference to FIG. 2.

2 shows a state diagram of use of the present invention shown in FIG.

In order to insert the nozzle 20 of the present invention into the inner surface of the steel pipe or cast iron pipe heated to 200 ~ 230 ℃, first, by driving the servo motor 56 of the height adjusting means 50 the lifting body 52 Move the up and down to adjust the height.

Then, the nozzle 20 is inserted into the steel pipe or the cast iron pipe by advancing the trolley (not shown) loaded with the present invention. At this time, after adjusting the height more appropriately using the height adjusting means 50 to adjust the center adjusting bolt 66 of the center adjusting means 60 to fit the nozzle 20 to be in the center of the steel pipe or cast iron pipe. If the nozzle 20 is drooping down with respect to the center, tightening the upper part of the centering bolt 66 while the support ring 54 is the support point, The second water cooling pipe 40 is lowered and at the same time the second water cooling pipe 40 on the nozzle 20 side can be lifted so that it can be centered. It works like a lever.

In addition, even when the nozzle 20 is biased to the left or right, it can be adjusted so that the nozzle 20 is located in the center of the steel pipe or cast iron pipe by adjusting the position on the left or right of the center adjustment bolt 66.

Next, by operating a rotary driving roller to rotate the steel pipe or cast iron pipe to rotate the steel pipe or cast iron pipe at a constant speed and to supply the powder coating to the supply pipe 10 to be sprayed through the nozzle (20).

At the same time, when cooling water is injected through the cooling water inlet 32, the cooling water flows while cooling the powder coating inside the supply pipe 10 through the first water cooling pipe 30, and is discharged through the water hole 34. It flows into and flows into the second water cooling pipe 40 and is discharged to the outside through the cooling water outlet 42 to be cooled again and then re-introduced.

Through this process, the powder coating inside the supply pipe is cooled through a double water cooling tube so that it does not melt or agglomerate with each other, and the second water cooling tube is formed in multiple stages, thereby minimizing sag even if the length is increased.

1 is a cross-sectional view showing a powder coating device of the inner surface of a steel pipe or cast iron pipe according to an embodiment of the present invention.

2 is a use state diagram of the present invention shown in FIG.

<< Explanation of main parts of drawing >>

10: supply pipe 20: nozzle

30: first water cooling pipe 32: cooling water inlet

34: water hole 40: second water cooling pipe

42: cooling water outlet 44: connector

50: height adjustment means 52: lifting body

54: support ring 56: servo motor

60: center control means 62: support

64: center adjustment ring 66: center adjustment bolt

70: roller 80: cap

Claims (5)

It is composed of a supply pipe 10 is inserted into the steel pipe or cast iron pipe and supplies the powder coating from the outside, and the nozzle 20 is provided at the end of the supply pipe 10 to spray the powder coating on the inner surface of the heated steel or cast iron pipe In the device for painting the inner surface of the cast iron pipe, Outside the supply pipe 10 accommodates the supply pipe 10 therein and flows the first water cooling pipe 30 and the first water cooling pipe 30 through which the cooling water supplied from the outside flows, and the first water cooling. The second water cooling pipe 40 is further provided to the outside while the cooling water flowing from the pipe 30 flows, the second water cooling pipe 40 is connected to a plurality of pipes of different cross-sectional area so as to prevent sagging. Steel powder or cast iron pipe inner surface powder coating apparatus, characterized in that the cross-sectional area is reduced toward the nozzle (20) direction. The method of claim 1, The first water cooling pipe 30 is provided with a cooling water inlet 32 through which the coolant is introduced from the outside on one side, and the water supply hole 34 through which the coolant introduced is discharged to the second water cooling pipe 40. ) Is formed, The second water cooling pipe 40 is a powder coating device for the inner surface of the steel pipe or cast iron pipe, characterized in that the cooling water outlet 42 for discharging the cooling water introduced through the through-hole is formed on one side. The method of claim 1, On one side of the second water cooling pipe 40, Steel powder or cast iron pipe inner powder coating device, characterized in that the height adjustment means 50 is provided to move the second water cooling pipe 40 up and down to adjust the height. The method of claim 3, wherein The height adjusting means 50, A lifting body 52 coupled to the second circumferential surface of the second water cooling pipe 40 to move up and down, a support ring 54 inserted between the second water cooling pipe 40 and the lifting body 52, and the lifting body ( 52) Powder coating device for the inner surface of the steel pipe or cast iron pipe, characterized in that consisting of a servo motor (56) for driving up and down. The method of claim 3, wherein Outside the height adjusting means 50, A center adjustment coupled to the height adjusting means 50 and coupled to the support 62, the second water cooling pipe 40 is received therein, and the outer peripheral surface of the second water cooling pipe 40 accommodated in the support 62 A central adjusting means 60 is further provided with a ring 64 and a plurality of central adjusting bolts 66 screwed through the support 62 and coupled to the central adjusting ring 64. Powder coating equipment for inner surface of steel pipe or cast iron pipe.

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