KR20150060124A - Method for Coating Pipe and Apparatus for the Same - Google Patents

Abstract

The present invention relates to a pipe coating method and a pipe coating apparatus, and more specifically, to a pipe coating method which allow surfaces of pipes with a certain length to be consecutively coated, and to an apparatus therefor. The coating apparatus comprises: an insertion module (21) enabling a plurality of pipes cut into certain lengths to be sequentially inserted; a coating module (22) including a coil (221) enabling a pipe (P) transferred from the insertion module (21) to pass, a coating unit (222) coating the surface of the pipe (P) which passes the coil (221), and drying units (223, 224) drying the pipe (P) discharged from the coating unit (222); and a discharge module (23) having an extension plate (231) enabling the pipe (P) transferred from the coating module to be transferred, and an inclined plate (223) slopingly extended in a longitudinal direction with respect to the extension plate (231). The insertion module (21) comprises: a standby unit (215) enabling the pipe (P) to wait in an inclined state; an inducing piece (213) for the movement of the pipe (P); and a rotating roller (214) moving the pipe (P) transferred to the inducing piece (213) in a predetermined direction.

Description

TECHNICAL FIELD [0001] The present invention relates to a pipe coating method,

The present invention relates to a pipe coating method and a pipe coating apparatus therefor, and more particularly, to a pipe coating method and apparatus for continuously coating a surface of a pipe having a predetermined length.

Pipes of various materials are used as industrial materials for construction materials, decorative materials or structures. Pipes must be processed to have a certain diameter and length in order to be used as an industrial material, while coatings are required to improve durability or corrosion resistance.

As a prior art related to the coating of pipes, there is a utility model registration No. 0140848 'resin coating apparatus of pipe surface'. In the prior art, the preheating pipe is supplied to the coating portion to allow the resin to be coated on the outer surface of the pipe, and the coated pipe is allowed to cool out through the coating portion. And a polyethylene resin injected into the hopper is melted to be supplied to the head space, and a guide plate having a guide hole is formed outside the through hole formed at the front and rear of the head space, And the resin is coated on the outer surface of the pipe to be coated with the resin.

Another prior art related to the coating of pipes is Patent Registration No. 0974641, " Pipe Coating Apparatus ". The prior art includes heating and supplying means for heating and discharging the pipe, a deposition tank in which a powdery coating material is accommodated in the upper portion of the porous plate, and a lower portion is connected to the air generating means for flowing the coating material; And a gripping means which is disposed between the heating and supplying means and the immersion tank and which grips the pipes individually discharged through the heating and supplying means and immerses the immersion tank in the immersion bath so that the heating, , A process for cooling is automatically performed to improve the productivity of the product, thereby reducing the production cost.

Another prior art related to the coating of pipes is Patent Registration No. 0909836, 'Coating Apparatus and Method for Coating Tubes with Powder Powder'. The prior art includes conveying means for conveying a tube; A rail fixed to both sides of the conveying means; Heating means provided on the rail and having a hollow shape having an inner diameter larger than the outer diameter of the tube to be coated, the heating means heating a predetermined portion of the tube; A boom provided on the rail and spraying the powdered powder on the inner surface of the predetermined portion of the heated tube inserted at a predetermined interval into the tube to coat the powdered powder on the inner surface of the tube heated by the heating means, Shaped inner coating boom zone; And a tubular powder powder coating apparatus provided on the rail and spraying the powder powder onto the outer surface of the predetermined part of the tube heated to coat the powder powder on the outer surface of the tube heated by the heating means Characterized in that the conveying means transports the tube so that a predetermined portion of the tube passing through the heating means is heated and temporarily powder coated on the inner surface and the outer surface of the tube portion of the temporarily heated portion. .

The prior art does not disclose a coating method or apparatus capable of continuously coating a metal pipe. Also, it is not disclosed how the surface of the metal pipe can be efficiently coated.

The present invention has been made to solve the problems of the prior art and has the following purpose.

It is an object of the present invention to provide a pipe coating method which allows the surface of a metal pipe to be continuously coated.

It is another object of the present invention to provide a pipe coating apparatus which enables a uniform coating surface to be obtained while allowing the surface of the metal pipe to be continuously coated.

According to a preferred embodiment of the present invention, the coating method comprises the steps of continuously feeding a pipe having a predetermined length and diameter by a feed roller; Subjecting the pipe to high-frequency processing in a transfer path; The surface of the high frequency treated pipe is coated; The surface of the coated pipe is subjected to hot air drying and heat drying; And the step of discharging the dried pipe into the dehumidifying space, wherein the high frequency treatment is performed by applying an alternating current while passing the pipe through the coil.

According to another preferred embodiment of the present invention, the coating apparatus includes a charging module for sequentially supplying a plurality of pipes cut into a predetermined length; A coating module for coating the surface of the pipe passing through the coil, a drying unit for drying the pipe discharged to the coating unit, and a coating module for coating the surface of the pipe, And an exhaust module formed of an inclined plate extending in a longitudinally inclined manner with respect to the extension plate; The input module includes an atmospheric unit for allowing the pipe to wait in a tilted state, an induction piece for moving the pipe, and a rotating roller for moving the pipe transferred to the induction piece in a predetermined direction.

According to another preferred embodiment of the present invention, the coating unit comprises a coating body, a discharge cylinder formed in front of the coating body and an adjustment unit formed in the interior of the coating body, the gap between the adjustment unit and the discharge cylinder being It is adjustable.

The coating method according to the present invention has the advantage that the productivity can be improved by allowing the metal pipe to be continuously coated. In addition, the coating method according to the present invention has an advantage that the quality of the product can be improved by allowing the surface of the metal pipe to be coated by the high-frequency treatment and coating unit so that a uniform coated surface can be obtained.

1 shows an embodiment of a coating method according to the present invention.
Figure 2a shows an embodiment of a supply module which can be applied to a coating apparatus according to the invention.
Figure 2b illustrates an embodiment of a coating module according to the present invention.
Figure 2c illustrates an embodiment of a discharge module that may be applied to a coating apparatus according to the present invention.
Fig. 3 shows an embodiment of a unit in which the thickness of the coating surface is controlled in the coating apparatus according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the accompanying drawings, but the present invention is not limited thereto. In the following description, components having the same reference numerals in different drawings have similar functions, so that they will not be described repeatedly unless necessary for an understanding of the invention, and the known components will be briefly described or omitted. However, It should not be understood as being excluded from the embodiment of Fig.

1 shows an embodiment of a coating method according to the present invention.

Referring to FIG. 1, a method of coating a pipe according to the present invention includes a step S12 of continuously feeding pipes having a predetermined length and diameter sequentially by a feed roller; Subjecting the pipe to high-frequency processing in a transfer path; The surface of the high frequency treated pipe is coated; The surface of the coated pipe is subjected to hot air drying and heat drying; And the step of discharging the dried pipe to the dehumidifying space, wherein the high frequency treatment may be performed by applying an alternating current while passing the pipe through the coil.

The coating method according to the present invention can be applied for coating the surface of a metal pipe. The metal pipe may have a predetermined diameter with a certain diameter. The metal pipe can be applied, for example, as a support for making a shelf for the display of the article or for storing the article. The metal pipe may be applied for various purposes if necessary, and the present invention is not limited to the embodiments shown.

For application of the coating method according to the present invention, the metal pipe needs to be cut to a predetermined length in advance. A constant length means that each pipe has a length according to the use and does not necessarily mean that the length of each pipe must be the same. The metal pipe may have a diameter of, for example, 2 to 20 cm and a length of 1 to 10 m. A plurality of metal pipes to be coated can be prepared in advance and put into a standby state (S11). The metal pipes in the waiting state for putting in can be sequentially put into operation (S12). The sequential insertion of the metal pipe can be accomplished, for example, by using a sloped moving surface and being transported along a predetermined path through the transport roller or the conveyor (S12).

The high-frequency process may first be performed on the metal pipe to be transported along a path along the conveyor or the rotating roller (S13). The high frequency treatment can be carried out in such a way that the metal pipe passes through a coil formed of a conductive material such as copper or platinum. An alternating current may be applied to the coil and an induction current may be generated on the surface of the metal. Also, due to the induction current generated on the metal surface, resistance heat is generated and the surface of the metal pipe can be heated. The level of the high frequency processing can be appropriately adjusted by the length of the coil, the magnitude of the applied current, or the frequency.

The high-frequency treated metal pipe can be coated in the coating unit (S14). The coating thickness may be predetermined and the coating may be, for example, polyethylene. A polyolefin, an ABS resin, an acrylonitrile butadiene styrene resin, or a polypropylene resin. The temperature of the coating unit can be appropriately controlled during the coating process, thereby enabling a coating having a uniform thickness. The coating can be carried out in such a manner that the coating material in powder or liquid form prepared in advance is introduced into the coating unit (S10) and the applied raw material is applied to the surface of the transferred metal.

The metal pipe coated in the coating unit can be hot-air dried (S15). The hot air drying can be performed by, for example, a method of sending a wind having a temperature of 30 to 80 DEG C to the front of the coating unit using a hot air pipe. Hot air drying can be done at the location where the coated metal pipe leaves the coating unit. Heat drying with hot air drying can be performed (S16). Thermal drying can be accomplished by, for example, irradiating a coated metal pipe with light such as infrared or ultraviolet light. Thermal drying can be carried out with hot air drying or after hot air drying. As described above, since the hot air drying and the heat drying are simultaneously performed, the coated surface of the metal pipe can be dried in the process of being removed from the coating unit and transported. The metal pipe after which the coated surface has been dried can then be discharged to an appropriate collector (S17). The periphery of the collector or the interior of the collector can be dehumidified by appropriate fan arrangement (S20). The dehumidification may be performed by, for example, a method of removing moisture and foreign matter, and a method of absorbing air around the collector using a device such as a fan. The dehumidification process is to prevent foreign matter or moisture from adhering to the coating surface.

The coating process according to the invention can be carried out in various apparatuses.

The coating apparatus according to the present invention includes: a charging module (21) for sequentially supplying a plurality of pipes cut to a predetermined length; A coating unit 222 for coating the surface of the pipe P passing through the coil 221, a coating unit 222 for coating the surface of the pipe P, a coating unit 222 for coating the surface of the pipe P, A coating module 22 comprising drying units 223 and 224 for drying the pipe P discharged from the coating module 22 and a drying unit 223 for drying the pipe P discharged from the coating module 22, And an exhaust module (23) comprising an inclined plate (233) extending in a longitudinally inclined manner with respect to the extension plate (231) and the extension plate (231); The charging module 21 is provided with an waiting unit 215 for allowing the pipe P to be tilted, an induction piece 213 for moving the pipe P, and an induction piece 213 And a rotating roller 214 for moving the pipe P in a predetermined direction.

Each module will be described in detail below.

Figure 2a shows an embodiment of a dosing module 21 which can be applied to a coating apparatus according to the invention.

2A, the charging module 21 includes a plurality of supporting members arranged in an inclined form for supporting a plurality of pipes P, an induction frame 211 formed on the opposite side of the supporting member, an induction frame 211 And a plurality of rotation rollers 214 arranged along the conveying direction. The guide rods 212 may be formed of a plurality of rollers 214 arranged in the conveying direction.

The pipe P can be kept in the standby state by the bent air unit 215 and moved to the rotary roller 214 along the guide piece 213 when the air unit 215 moves downward . A control unit (not shown) may control the operation of the standby unit 215 in accordance with a signal transmitted from a detection sensor formed at the end of the induction frame 211. A signal indicating that the transfer of the metal pipe in the process of transfer from the detection sensor is completed can be transmitted to the control unit. Accordingly, when the control unit moves the front portion of the waiting unit 215 downward, the other pipe P can be conveyed to the rotary roller 214 along the guide piece 213. The pipe P can be conveyed to the coating module 22 by the rotation roller 214 fixed to the rotation shaft 214a while one part is supported by the guide rod 212. [

Figure 2b illustrates an embodiment of a coating module 22 according to the present invention.

2B, the coating module 22 includes a coil 221 formed to allow passage of the pipe P, a coating unit 222 coating the surface of the metal pipe P passing through the coil 221, A hot air drying unit 223 and a heat drying unit 224 formed in front of the coating unit 222. [

The coil 221 may be made of a conductive material such as copper or platinum and the pipe P may be transported through the coil 221. One end and the other end of the coil 221 may be connected to different AC electrodes, respectively. A high frequency current may be applied to the coil 221 in the process of transferring the pipe P so that the surface of the pipe P may be heated while being modified. High-frequency current means alternating current and the material of the pipe (P). Depending on the thickness of the coated surface or the coating material, the intensity of the frequency or current can be appropriately adjusted.

The pipe P having passed through the coil 221 can be transferred to the coating unit 222. The coating unit 222 may be generally cylindrical and may include a coating body 222a, an induction unit 222b formed at the rear of the body 222a and a discharge cylinder 222c formed at the front of the body 222a have.

The pipe P may be guided through the induction unit 222b into the interior of the coating body 222a to be coated. Liquid or powder resin can be introduced into the interior of the coating body 222a by a suitable hopper device and the surface of the pipe P can be coated. Appropriate heating means may be provided on the coating body 222a to control the temperature of the coating body 222a. And the coated pipe P can be discharged through the discharge cylinder 222c. The discharge cylinder 222c may have a structure capable of adjusting the thickness of the coating surface and may have a structure in which the inner diameter is adjusted, for example.

The pipe P discharged through the discharge cylinder 222c can be dried by the hot air drying unit 223 and the heat drying unit 224. [ The hot air drying unit 223 may be a flexible pipe structure capable of discharging dry air at 30 to 80 ° C, for example. The heat drying unit 224 may be a lamp capable of emitting infrared rays or ultraviolet rays. The pipe P is dried by the hot air drying unit 223 and the heat drying unit 224 during the transportation process and can be transferred to the discharge module.

Figure 2c illustrates an embodiment of a discharge module that may be applied to a coating apparatus according to the present invention.

2C, the discharge module 23 includes an extension plate 231 extending in the longitudinal direction of the pipe P to be transported, a slope plate 233 extending in the lateral direction from one edge of the extension plate 231, And a blocking wall 232 formed in a direction perpendicular to the inclined plate 233 to prevent the pipe P from escaping. The extension plate 231 may have a length corresponding to the length of the pipe P and at least a part of the extension plate 231 may be inclined in the direction of the inclined plate 233. [ Therefore, when the entire pipe P is positioned on the extension plate 231, the pipe P moves in the direction of the inclined plate P by itself. On the other hand, the end of the inclined plate 233 may be formed parallel to the ground. This structure of the inclined plate 233 allows the pipe P to be stably moved along the extension plate 231 and the inclined plate 233. [

The injection module, coating module or discharge module described above is exemplary and the invention is not limited to the embodiments shown.

The process of controlling the thickness of the coating surface in the coating unit according to the present invention will be described below.

Fig. 3 shows an embodiment of a unit in which the thickness of the coating surface is controlled in the coating apparatus according to the present invention.

Referring to FIG. 3, the coating body 222a of the coating unit 222 may be connected to a supply line 31 for injecting liquid resin or powder resin into the interior of the coating body 222a. And a control unit 32 that is movably installed inside the coating body 222a may be formed. The front side of the regulating unit 32 may be inclined or horn-shaped, and the inner surface of the coating body 222a and the outer surface of the regulating unit 32 may form a ramp. The inclined path may have a structure in which the sectional area becomes narrower as it approaches the discharge cylinder 222c. The end of the ramp can be connected to the pipe P and the supply line 31 can be connected to the ramp. The coating material R introduced through the supply line 31 flows through the ramp to apply the surface of the pipe P. [ The distance between the end of the regulating unit 32 and the end of the regulating unit 32 can be made adjustable. For example, the guide unit 222b and the adjustment unit 32 can be screwed and the adjustment unit 32 can be moved forward or backward by rotation of the guide unit 222b. On the other hand, appropriate pressure may be applied to the supply line 31.

The pressure on the supply line 31 and the movement of the regulating unit 32 is intended to form a uniform coating surface. For example, if the gap between the ends of the ramp is narrower than the conveying speed, the coating surface may become thinner and the variation of the coating thickness may be small. On the other hand, when the gap is wide, the coating surface becomes thick and the variation of the coating thickness may become large. Therefore, the interval needs to be appropriately adjusted depending on the amount of the raw material P to be supplied, the pressure, and the feed rate of the pipe.

The coating unit 222 may be formed in various structures, and the present invention is not limited to the embodiments shown.

The coating method according to the present invention has the advantage that the productivity can be improved by allowing the metal pipe to be continuously coated. In addition, the coating method according to the present invention has an advantage that the quality of the product can be improved by allowing the surface of the metal pipe to be coated by the high-frequency treatment and coating unit so that a uniform coated surface can be obtained.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention . The invention is not limited by these variations and modifications, but is limited only by the claims appended hereto.

20: Coating device 21: Input module
22: Coating module 23: Discharge module
31: supply line 32: regulating unit
211: guide frame 212: guide rod
213: guide piece 214: rotating roller
215: standby unit 221; coil
222: coating unit 223: hot air drying unit
224: Thermal drying unit 231: Extension plate
232: blocking wall 233: inclined plate

Claims (3)

The pipes having a predetermined length and diameter are successively and successively conveyed by the conveying rollers;
Subjecting the pipe to high-frequency processing in a transfer path;
The surface of the high frequency treated pipe is coated;
The surface of the coated pipe is subjected to hot air drying and heat drying; And
Wherein the dried pipe is discharged to a dehumidifying space,
Wherein the high-frequency treatment is performed by applying an alternating current while passing the pipe through a coil. An input module (21) for sequentially inputting a plurality of pipes cut into a predetermined length;
A coating unit 222 for coating the surface of the pipe P passing through the coil 221, a coating unit 222 for coating the surface of the pipe P, a coating unit 222 for coating the surface of the pipe P, A coating module (22) comprising drying units (223, 224) for drying of the pipe (P)
An extension plate 231 for allowing the pipe P transferred from the coating module 22 to be transferred and an inclined plate 233 extending in the longitudinal direction inclined with respect to the extension plate 231 Module (23);
The charging module 21 is provided with an waiting unit 215 for allowing the pipe P to be tilted, an induction piece 213 for moving the pipe P, and an induction piece 213 And a rotating roller (214) for moving the pipe (P) in a predetermined direction. The coating unit according to claim 2, wherein the coating unit 222 comprises a coating body 222a, a discharge cylinder 222c formed in front of the coating body 222c and an adjustment unit 32 formed in the interior of the coating body 222c , And the distance between the regulating unit (32) and the discharge cylinder (222c) is adjustable.

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