KR100448014B1 - Painting method for inside of pipe and painting apparatus - Google Patents

Abstract

PURPOSE: A painting method for an inside of a pipe and an apparatus therefor are provided to reduce energy loss and to secure a painting quality by introducing a centering process for aligning an arrangement of the pipe upon an intrusion painting of a nozzle into the pipe. CONSTITUTION: The painting method comprises a steps of: a pipe centering process for centering a pipe to be painted corresponding to a moving path of a nozzle inserted into the pipe to paint an inside thereof; and a painting process for painting the inside of the pipe with the nozzle inserted therein. The painting apparatus comprises a cleaning section(300), a dryer section(400), a painter section(500) for outside of the pipe, a painter section(600) for inside of the pipe, a transfer section for connecting the sections with each other, a centering device(C) and a controller for controlling painting process. The painter section includes a paint tank, a compressor, a nozzle supply, a nozzle and a connector pipe connecting the former elements.

Description

Coating method for inner surface of pipe and coating device for same {PAINTING METHOD FOR INSIDE OF PIPE AND PAINTING APPARATUS}

The present invention relates to a coating method of the inner surface of the pipe and an automated coating apparatus for the same. More particularly, when the nozzle is put into the pipe to coat the inner surface, the arrangement of the pipes is aligned to match the path of the nozzle. The present invention relates to a pipe inner coating method incorporating a centering process and a painting device having a centering device. In addition, the coating method according to the present invention includes an optimized washing process, a drying process, an outer coating process, and an inner coating process to ensure the coating quality of the painted pipe while reducing energy loss. The coating device according to the invention includes a washing part, a drying part, an outer coating part, an inner coating part, and a transfer part connecting each component.

Looking at the conventional pipe inner coating device for painting the inner surface of the pipe to prevent corrosion of the metal pipe as follows.

First, there is a Korean Patent Publication No. 1985-0004408 `` Synthetic resin coating method of the inner diameter of the metal pipe '' related to coating the inner surface of the pipe by inserting the nozzle retracted by the hydraulic cylinder into the pipe.

There is also the Korean Utility Model Publication No.1993-0002263, `` Pipe Inside Automatic Painting Device, '' which involves painting the inside of a pipe using a spray gun installed on a carriage moving a road while rotating the pipe with a turning roller.

And Korean Patent Laid-Open Publication No. 2002-0025111, `` Pipe Automatic Painting Device '', which is related to a device consisting of means related to washing, drying, cooling, outer painting, inner painting, and the like.

However, such conventional pipe inner coating devices and coating methods using these devices do not present a pipe centering process and a centering means, which are essential for automation, in order to realize a process requiring no manual work. That is, the centering means must be provided to position the nozzle inside the pipe can be automated to paint the inner surface, the conventional coating devices do not present this.

Because of this, manual work is required, so conventional painting devices are inadequate for mass production of internally painted pipes. Consequently, conventionally painted pipes have a higher cost than ordinary pipes, resulting in increased purchasing power compared to unpainted internal pipes. I had to fall.

In addition, there is no transfer means that links each means related to washing, drying, external coating, and internal coating, so that a continuous process is impossible.

In addition, in the conventional pipe coating apparatus, including the published patents and the utility model, the pipe is dried after the outer coating, or even when the outer coating after drying, the coating on the outer surface of the pipe is generally not completely dried in time, so that the pipe during transportation Since friction occurs with each part of the device, the paint peeled off, which caused the coating quality to deteriorate.

On the other hand, in various conventional coating processes and coating apparatuses, the drying processes that occupy the largest part in terms of energy loss overlap unnecessarily, resulting in many energy losses.

The present invention is proposed to solve the problems posed by the conventional pipe inner coating device and coating method as described above.

First of all, an object of the present invention is to provide a coating method having a centering process for aligning pipes so as to coincide with the advancing direction of nozzles introduced into the pipe inner surface for painting the inner surface of the pipe, and a painting apparatus having a centering means.

It is another object of the present invention to provide a process arrangement and a device arrangement sequence which can minimize energy loss without damaging the state of the paint painted on the pipe surface when the washing, exterior coating, internal coating and drying processes are linked. It is done.

In addition, an object of the present invention is to provide a conveying means of the pipe that can supply the pipe in a continuous, automated manner by connecting each component.

1 is a block diagram showing an example of the arrangement of each component constituting the pipe inner surface coating apparatus according to the present invention,

2a and 2b are schematic front views associated with a loading portion for loading a pipe to the conveying portion,

Figure 3 is a schematic front view of the outer coating,

4a and 4b is a schematic front view showing an example of a turning means for switching the conveying direction of the pipe from the omni-directional conveying means to the lateral conveying means of the pipe conveying portion,

5a to 5d is a schematic front view showing the operation relationship between the centering means and the in-position transfer means and the flipping means associated with the inner surface coating;

6a and 6b is a schematic front view and side view of the nozzle moving means of the inner coating;

7a and 7b is a schematic side view and a plan view showing the omni-directional conveying means after the inner and outer surface of the pipe is completed, before being transferred to the packaging;

8 is a schematic front view showing the pipe packaging.

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

100: transfer unit 110: omni-directional transfer means

111: drive motor 113: rotating roller

115: belt 120: lateral transfer means

121,123: Sprocket 125: Chain

131: linked transport means 133: lifting means

140: exact position transfer means

141: tables 143a and 143b: lifting members

145: rail 150: flipping means

151: motors 151a, 151b, 151c, 151d: sprockets

153: rotating body 155a, 155b: electromagnet

200: loading unit 210: supply means

211: lifting frame 213: lifting member

215: movable belt 220: unloading means

221: moving frame 223: driving member

225a: wheel 225b: rail

227; Electromagnet 300: cleaning unit

400: drying part 500: outer coating part

501: paint storage tank 503: compressor

505: nozzle 507: connector

509: chamber wall 600: inner coating portion

610: nozzle 620: nozzle moving means

621: carriage 623a, 623b: guide rail

625: moving member C: centering means

700: packaging portion 710: main body

720: elevating member 730: electromagnet

740: bracing 800: control unit

In order to achieve the above object, the coating method of the inner surface of the pipe according to the present invention includes a centering process of arranging the pipes so as to match the advance path of the nozzles introduced into the pipes for painting the pipes; And an inner surface painting process for coating the inner surface of the pipe by inserting a nozzle into the inside of the pipe.

In addition, the pipe surface coating apparatus according to the present invention is a paint storage tank, a compressor for providing a spray pressure, a nozzle moving means, a nozzle introduced into the pipe by the nozzle moving means and the paint storage tank and the compressor is connected to the nozzle An inner coating portion including a connection pipe and arranged in front or rear of the outer coating portion; Centering means for aligning the pipe to coincide with the trajectory of the nozzle; And a control unit for controlling each component.

Hereinafter, with reference to the accompanying drawings will be described in detail the coating method and the inner coating device of the inner surface of the pipe according to the present invention. Like reference numerals in the drawings denote members having the same function.

First, the inner surface coating method of the pipe according to the present invention will be described. The biggest feature of the coating method of the present invention is that it has a centering process of aligning the pipes so as to match the advance path of the nozzles introduced into the pipes for painting the pipes.

Various processes can be combined based on the centering process and the inner surface painting process.

The combination of the first coating process is to introduce an outer coating process, the outer coating process may be made before or after the inner coating process. The outer coating process requires a drying process to prevent the painting state from being damaged during the pipe movement after painting. In addition, the drying process may be carried out before or after the outer coating process.

If the drying process is carried out after the outer coating process, the coating strength can be made larger than that of the drying process first. If the drying process is made before the outer coating process, the paint is applied as compared with the case where the drying process is carried out after the outer coating. The faster the drying time, the shorter the overall process time and less damage due to the friction has the advantage. The drying step is preferably a heat drying step of setting the temperature of the pipe to about 70 ° C or higher.

Looking at the painting process arrangements that can be considered in the first combination, it is shown in <Table 1>.

[Table 1] Pipe inner coating methods further including outer coating and drying process

① Centering → Inner Painting → Drying → Outer Painting ② Centering → Inner Painting → Outer Painting → Drying ③ Exterior Painting → Drying → Centering → Interior Painting ④ Drying → Exterior Coating → Centering → Internal Coating ⑤ Drying → Centering → Inner Painting → Outer Painting

The combination of the second coating process is to introduce a washing process, the washing process is made by spraying a cleaning liquid such as degreasing liquid in order to remove various contaminants such as cooling oil on the outer surface of the pipe during manufacture of the pipe. Cleaning is generally focused on keeping the outside of the pipe clean. Because the painting on the outer surface of the pipe should be considered not only to prevent corrosion but also to the beauty of the painted surface, however, the painting on the inner surface of the pipe has a large purpose to prevent corrosion of metal materials. This is because the purpose of prevention can be sufficiently achieved.

If a cleaning process is introduced, it is necessary to dry the cleaning solution before painting, especially external coating. The drying process for drying the washing liquid may be an air spray drying process for drying only the washing liquid. Another washing liquid drying process may be a drying process by heating for both washing liquid drying and the paint drying.

Looking at the coating process arrangements conceivable in the second combination as shown in Table 2 below.

[Table 2] Pipe inner coating methods further comprising a washing process

㉮ Cleaning → First drying by air spraying → Any one of ① to ③ in <Table 1> (However, the drying process in ① to ③ is the second drying by heating) ㉯ Cleaning → In <Table 1>, ④ or ⑤ (However, drying process in ④ or ⑤ is drying by heating)

The combination of the third coating process is divided into two stages of the external coating process of the pipe, and consists of a first external coating process for painting the initial exposed surface and a second external painting process for painting the initial non-exposed surface. The reason for separating the outer coating process into two processes is that the paint coated on the outer surface of the pipe is not yet completely dried even after the drying process, so the paint coated on the outer surface of the pipe, especially the bottom surface, may be damaged by friction, resulting in high paint quality. It is to solve the problem of falling.

Therefore, it is preferable that the said 1st outer surface coating process is carried out at the beginning of a whole painting process if possible, and it is preferable that the said 2nd outer surface coating process is performed at the end of a whole coating process. This ensures the longest period of time that the paint, which is located on the bottom after the flipping process to expose the initial unexposed surface, can dry the painted material on the initial exposed surface of the pipe to which friction will occur.

The coating process arrangements conceivable in this third combination are illustrated in Table 3 as follows.

[Table 3] Pipe inner coating methods further comprising the first outer coating and the second outer coating process

㉠ Centering → Internal Coating → Heat Drying → First Exterior Coating → Flipping → Second Exterior Coating ㉡ Centering → Internal Coating → First Exterior Coating → Heat Drying → Flipping → Second Exterior Coating ㉢ 1st external coating → heat drying → centering → internal coating → flip → 2nd external coating ㉣ 1st external coating → heat drying → flip → 2nd external coating → centering → internal coating ㉤ Heat drying → Centering → Inner coating → 1st external coating → Flipping → 2nd external coating ㉥ Heat drying → 1st external coating → centering → internal coating → flip → 2nd external coating ㉦ Heat drying → 1st external coating → Flipping → Centering → Internal coating → 2nd external coating ㉧ Heat drying → 1st external coating → Flipping → 2nd external coating → Centering → Internal coating ㉨ Washing → First drying by air spraying → Any of the above-mentioned ㉠ to ((wherein the drying process from ㉠ to 은 is second drying by heating) ㉩ Washing → Any of the above-mentioned ㉤ to ((wherein the drying process from ㉤ to 은 is dried by heating)

The attached block diagram of FIG. 1 is for a painting apparatus, but this may also be applied to a painting method having a specific process sequence.

That is, washing → first drying by air spraying → first external coating → second drying by heating → centering → internal coating → flipping → second external coating. This process arrangement is in the form of a combination of ㉨ and 의 of <Table 3> in order to guarantee the coating quality on the outer surface of the pipe, minimize the number of processes, minimize energy consumption, and maximize the drying effect. It is related.

Next, a coating apparatus for realizing the coating method of the inner surface of the pipe as described above will be described.

The painting apparatus of the inner surface of the pipe according to the present invention may be composed of an inner coating portion for applying the nozzle to the inner surface of the pipe and painting, a centering means for aligning the pipe so as to coincide with the trajectory of the nozzle, and a control unit thereof.

However, as shown in Figure 1, in consideration of the optimum arrangement of the device for painting both the outer surface and the inner surface of the pipe in a continuous process will be described a coating device including all of the packing portion 700 starting from the loading unit 200 Do it. However, the present invention is not limited by the specific arrangement order of these components.

First, in FIG. 1, FIG. 2A and FIG. 2B, the loading part 200 is a device which locates the pipes P one by one in the conveyance part 100, especially the omnidirectional conveyance part 110. FIG. The loading unit 200 is composed of a supply means 210 and the loading and unloading means 220.

Although the illustrated pipe P is a rectangular tube having a rectangular cross section, a pipe having various shapes and sizes may be painted, such as a circular cross section or a triangular cross section.

The supply means 210 is a moving belt made of a drive motor 215a, a chain 215e moving between the drive sprocket 215c and the driven sprocket 215d connected to the drive motor 215a and the chain 215b. Has 215. In addition to the moving belt 215, the supply frame 210 lifting frame 211 is provided with a lifting member 213 that can adjust the height of the lifting frame 211.

In addition, the unloading means 220 is a moving frame 221 having a wheel 225a moving on the rail 225b by the drive member 223 in the form of a hydraulic cylinder, and forward feed from the supply means 210 The means 110 consists of an electromagnet 227 to which the pipes P are attached one by one.

The omnidirectional conveying means 110 of the conveying means 100 is composed of a plurality of rotating rollers 113 connected to the pulley and the belt 115 of the drive motor 111. The omni-directional conveying means 110 is a plurality of rotating rollers 113 that are rotated by a motor for each predetermined section forms a set, it is preferable that a plurality of such sets of units are set. This is because it is easy to operate each set of units to turn on / off the rotational speed and the motor 111 by the controller 800 (see FIG. 1). The predetermined section in which the unit sets are arranged may be, for example, for each component shown in FIG. 1, such as a washing unit, a first drying unit, a first outer coating unit, and one or more forward transfer means sets in each section. Two or more may be provided.

2A and 2B, when the pipe P is placed on the chain 215e of the supply means 210 by a forklift or a separate crane, the first pipe in the first left column is first unloaded by the unloading means 220. First, it is mounted on the rotation roller 113 of the omni-directional feeder 110. That is, when power is supplied to the electromagnet 227 of the loading and unloading means 220 by the controller 800, a pipe is attached to the electromagnet 227, and the moving frame 221 is reversed by the driving member 223, and the pipe is moved forward. When located in the rotating roller 113 of the conveying means 110, the power is cut off and the pipe is separated from the electromagnet 227 is placed on a plurality of rollers 113. At this time, between the supply means 210 and the unloading means 220 is provided with a linking means 230 is provided with a plurality of small rollers on the top can be moved stably the pipe attached to the electromagnet 227. Next, since the roller 113 is rotated by the motor 111, the pipe is transported forward by the roller 113.

Subsequently, the elevating frame 211 of the supply means 210 has the same horizontal line as that of the electromagnet 227 of the unloading means 220 due to the elevation of the elevating member 213 which is a hydraulic cylinder. It is located in the phase. By the operation of the driving member 223 and the on / off of the power supply, the second pipe is mounted on the roller 113 of the conveying means 110 and conveyed.

When all the pipes in the first left row are moved, the drive motor 215a of the supply means 210 is operated, and thus the supply belt 215 is operated so that the pipe located on the chain 214e is moved to the left by a single pipe width. .

The operation of the driving motor 215a and the elevating member 213 of the supply means 210 may be precisely controlled by the numerical control means when the dimensions of the pipe to be painted are input to the controller 800 in advance.

When the pipes are transported one by one from the left as described above, as shown in FIG. 2B, the pipes are gradually transferred.

In FIG. 1, a detailed view of the cleaning unit 300 arranged after the loading unit 200 is omitted. The washing unit 300 includes a washing liquid storage tank such as degreasing liquid, a compressor for providing injection pressure, an injection nozzle, and a connection pipe connected to the tank, the compressor, and the injection nozzle. The nozzles are arranged radially on the outside of the pipe to remove contaminants adhering to the outside of the pipe.

The cleaning part is to ensure the coating quality of the pipe. As described in the above coating method, since the painting on the inner surface of the pipe is intended to prevent corrosion of the metal material rather than to make the appearance of the pipe beautiful, the corrosion prevention is prevented even if the inner surface of the pipe is simply cleaned without cleaning the inner surface of the pipe. The purpose can be fully achieved. Therefore, the cleaning unit is to clean only the outer surface of the pipe simplifies the coating device, it is possible to shorten the coating time, and to prevent the pipe unit price rise. However, depending on the purpose of the pipe, it is also possible to clean the inner surface of the pipe.

Next, in FIG. 1, the first drying unit 410 removes the cleaning liquid from the outer surface of the pipe. The first drying unit 410 may be a drying means for heating the pipe in order to dry the paint coated on the pipe as described above in the coating method, the first drying unit 410 in the arrangement shown in FIG. Is preferably in the form of spraying air to remove the cleaning liquid on the outer surface of the pipe.

The washing unit 300 and the first drying unit 410 may be implemented to be washed and dried while the pipe is transported in the omnidirectional transfer means 110 described above.

1 and 3, the first outer coating 510 is pipe (P) by a plurality of rotating rollers 113 of the forward transfer means 110 in the chamber somewhat closed by the wall (509) The outer coating of the pipe is to be made during the transfer.

The first outer coating unit 510 is a paint storage tank 501 for storing the paint, a compressor 503 for providing a spray pressure so that the paint from the paint storage tank can be injected through the nozzle, by the compressor It comprises a nozzle 505 for spraying the paint provided, and a connecting pipe 507 connected to the tank, the compressor and the nozzle. The arrangement of the nozzles 505 is such that the three sides of the square tube P having a rectangular cross section are painted. The arrangement form and number of the nozzles 505 may be variously modified according to the shape of the pipe. Painting of the bottom portion, which is the initial unexposed surface of the pipe P, is later performed by the second outer surface coating portion 520. This is because, as described above, if the bottom surface of the pipe which is in continuous contact with the roller 113 of the conveying unit 110 is pre-painted, the initial contact surface of the finally produced pipe will be much damaged.

Subsequently, the pipe passing through the first outer coating unit 510 in FIG. 1 is transferred to the second drying unit 420 to undergo a drying process of the paint. In particular, unlike the first drying unit 410, it is now necessary to heat the temperature of the pipe to about 70 ℃ or more, it is necessary to move the pipe to a somewhat closed space to heat and dry.

In Figures 4a and 4b, it is necessary to switch the conveying direction of the pipe from the forward conveying means 110 to the lateral conveying means 120 in order to move to the second drying unit.

The lateral transfer means 120 is a drive motor (not shown), a rotating sprocket (not shown) connected to the drive motor, driven sprocket 123, and the chain is rotated along the rotating sprocket and the driven sprocket 125 is made.

In order to stably move the pipe from the omni-directional conveying means 110 to the lateral conveying means 120 so as not to overturn, the interlocking conveying means 131 is provided between the two conveying means 110 and 120 as a direction switching means. have. The associated transport means 131 is provided with a plurality of rollers (131b) are arranged inclined on the upper portion of the main body (131a), the main body (131a) is raised and lowered by the lifting member (131c) of the hydraulic cylinder type Adjusted.

When the pipe P arrives at the position where the second drying unit is located along the omni-directional conveying means 110, the presence of the pipe P is sensed so that a limit switch (not shown) is turned off, thereby Power to the drive motor is cut off. Accordingly, the plurality of rollers 113 constituting the unit set of the conveying means turned on / off by the switch is stopped, the forward conveyance of the pipe is stopped. The main body 131a is raised by the elevating member 131c of the associated transport means 131 by the signal of the controller, and as shown in FIG. 4B, the pipe P is mounted on the roller 131b which is inclined. It is moved smoothly from the direction transfer unit 110 to the lateral transfer unit 120. The pipe is moved along the lateral conveyance 120 to the second drying section.

The associated transfer means 131 may also serve to transfer a pipe from the lateral transfer means 120 to the omnidirectional transfer means 110. In this case, unlike in FIG. 4A, the lateral conveying means is positioned higher than the omnidirectional conveying means, and the rollers of the associated conveying means are arranged to gradually lower toward the omnidirectional conveying means in the lateral conveying means.

In FIG. 1, the pipe passing through the second drying unit 420 is painted on the inner surface of the pipe in the inner coating part 600 while being heated to about 70 ° C. or more.

First, referring to FIGS. 5A to 5D, a pipe transfer process to the inner coating unit 600 and a process of moving the pipe to the omnidirectional transfer unit 110 after the inner coating is made will be described.

It moves along the lateral transfer part 120 from the 2nd drying part to the vicinity of an internal coating position. In FIG. 5A, reference numeral 121 denotes a rotation sprocket connected to the motor.

The pipe located at the far left of the chain 125 of the lateral transfer unit 120 is transferred to the centering means C, which forms the core of the present invention, by the in-situ transfer means 140.

The position transfer means 140 is a lifting member consisting of a table 141 on which a pipe is mounted, a cam 143a for adjusting the height of the table 141, and a cylinder 143b for supporting the table 141, It includes a left and right moving member (not shown) for moving the table 141 left and right along the rail 145.

The table 141 is provided with a 'V'-shaped or' U'-shaped settling groove, as necessary, so that the mounted pipe does not leave the position. This groove will be necessary, especially if the cross section of the pipe is circular.

5A and 5B, the table 141 of the in-position conveying means 140 is initially located on the same horizontal line as the lateral conveying means 120. As the cam 143a of the elevating member rotates, the table 141 is raised in contact with the protrusion 141a of the table 141, and the pipe P2 transferred from the lateral transfer means 120 is lifted.

At this time, the centering means C, which has bitten the pipe P1 already painted by the inner surface coating part 600, is opened. When the table 141 is raised, the pipe P1 is also lifted together.

5C and 5D, the table of the position transfer means 140 is moved to the left along the rail 145 by the left and right moving members in a lifted state, and the table 141 is rotated by the cam 143a again. The pipe (P2) is placed on the settled portion (C1) of the centering device (C) while the descending), the centering device (C) is fixed by biting the pipe (P2). The settlement portion C1 may also be provided with a settling groove as necessary. The centering means may be in the form of a simple jig or groove recessed in the settling portion C1.

The pipe P1, which has already been painted on the inside, is turned upside down by the flipping means 150 for the exterior painting of the initial unexposed surface Pb, which is the lower surface portion.

The reason for inverting the pipe P1 is to prevent damage to the outer painted state. That is, even if the initial exposure surface (Pa), which is the upper surface portion which is already made of paint and contacts the forward transfer means (110) downward, the coating state will not be damaged, and the pipe (the second drying unit 420) Since P1) is heated to some extent during the movement and thus the temperature is not as high as the initial heating, the initial non-exposed surface Pb to be newly painted in the second outer coating part 520 (see FIG. 1) needs some drying time after painting. Shall be. Therefore, it is preferable to invert the pipe because the initial unexposed surface Pb needs to be kept in contact with each part of the painting apparatus as much as possible.

The flipping means 150 has a driving motor 151 and a rotating body 153 connected through a plurality of sprockets 151a, 151b, 151c, and 151d. The protrusions 153a and 153b of the rotating body 153 are provided with electromagnets 155a and 155b.

In FIG. 5C, the rotor 153 rotates while power is supplied to the electromagnets 155a and 155b of the flipping means 150, and the pipe P1 is connected to the electromagnet 155a attached to the protrusion 153a. The initial non-exposed surface Pb is attached, and the rotating body 153 rotates one turn so that the initial exposed surface Pa of the pipe P1 comes into contact with the rotation roller 113 of the omni-directional conveying means 110. In FIG. 5D, when the power supplied to the electromagnet 155a is cut off, the pipe P1 falls from the electromagnet 155a, and the pipe P1 is transferred along the omni-directional conveying means 110.

In FIG. 5D, the exact position conveying means 140 is moved to the right by the left and right moving member, and the pipe P3 located in the lateral conveying means 120 is placed on the table 141 of the exact position conveying means 140. In position, the next cycle is achieved.

6A and 6B, the inner coating for the pipe P fixed and moved from the lateral transfer means 120 to the centering means C by the in-position transfer means 140 will be described.

The inner coating unit 600 is a paint storage tank (not shown), a compressor (not shown) for providing a spray pressure, a nozzle moving means 620, the nozzle moving means to the inside of the pipe (P) It comprises a nozzle 610 is injected, and a connecting pipe (not shown) connected to the tank, the compressor and the nozzle.

The nozzle moving means 620 is a device for injecting the nozzle unit 611 with the nozzle inside the pipe (P) aligned by the centering device (C) to match the advancing direction of the nozzle 610. The carriage 621 having the fixing part 621 to which the nozzle unit 611 having a length corresponding to the length of the pipe P is fixed is moved along the guide rails 623a and 623b by the moving member 625. It is advanced and retracted into the pipe P of the nozzle and pulled out.

The moving member 625 for the carriage 621 is a motor 625a as a driving means, the chain 625b moving between the two sprockets 625c operated by the motor 625a, the chain 625b of the It consists of a fastening means (625d) for connecting both ends and the carriage 621.

In addition, the mounting member 605 for the carriage 621 is opposite the guide rails 623a and 623b for the rollers 621a, 621b and 621c of the carriage 621 and opposite ends of the fixing portion 621 of the nozzle block. It is composed of guide rollers (611c) (611a, 611b) as guide means for supporting and smoothly moving the nozzle. The guide rail not only guides the carriage 621 but also prevents the carriage 621 from moving up, down, left, and right due to the coupling relationship with the rollers 13a, 13b, and 13c.

Mounting member moving member 607 for adjusting the distance between the carriage mounting member 605 is a drive means installed in the apparatus main body 601, a motor 607a, a drive sprocket 607c connected to the motor and a driven sprocket (not shown) And a chain 607b moving between them. As in the carriage moving member 625, both ends of the chain of the mounting member moving member are connected by the carriage moving means and the fastening means (not shown).

The mounting member 605 may be moved along the transfer rail 603 formed in the main body 601 by the operation of the motor 607a of the mounting member moving member 607 to adjust the distance between the two mounting members. Although not shown, it is preferable that a roller is provided between the transfer rail 603 and the mounting member 605.

As described above, the set of nozzle moving means 620 consisting of the nozzle 610, the carriage 621, the carriage moving member 625, the carriage mounting member 605, and the mounting member moving member 607 is one inner coating device ( Two sets (S1) and (S2) are provided in the 600, and the carriage 621 advances and retreats by the moving member 625 according to the operation of the control unit, and the nozzle stand 611 is introduced into and out of the pipe. The distance between the carriage mounting member 605 is adjusted by the means 607.

The configuration of the carriage moving means 625 and the mounting member moving member 607 described above is a hydraulic type instead of a motor, and the carriage 621 or the mounting member 605 itself is provided with driving means, each The motor 625a, 607 and the carriage 621 and the mounting member 605 may be modified in various ways, such as the configuration of the gear, not a chain, these modifications should also be construed as falling within the scope of the present invention. do

The nozzle 610 is preferably completely injected into the pipe by the nozzle moving means 620, and then spraying the paint while gradually removing the nozzle again to paint the inner surface of the pipe (P). This is to prevent the possibility of damaging the coating state of the inner surface of the pipe by the nozzle when the nozzle is removed while painting the inner surface of the pipe by injecting paint into the pipe.

The paint applied to the inner surface of the pipe is dried at about the same time as it is applied since the pipe is not yet cooled after being heated in the second drying unit 420.

As described above with reference to FIGS. 5A to 5D, the pipe that has passed through the inner coating part 600 is flipped by the flipping means 150 and then transferred along the omnidirectional transfer means 110 to paint the initial non-exposed surface Pb. To pass through the second outer coating 520 (see FIG. 1). The configuration of the second outer coating unit is different from that of the first outer coating unit 510 described above with reference to FIG. That is, the nozzles are arranged so that the sprayed paint is concentrated on the initial unexposed surface of the pipe.

As shown in FIGS. 7A, 7B and 8, the pipe P, which is coated on both inner and outer surfaces, is moved to the packing part 700. It is also necessary to change the direction from the omni-directional conveying means 10 to the lateral conveying means 20 for the conveyance of the packing part 700, and the direction converting means is the associated conveying means 131 as shown in FIG. 7a, a hydraulic cylinder type lifting means 33 for adjusting the height of the omnidirectional transfer means 10 itself is introduced.

7A and 7B, when the pipe P reaches the end of the omni-directional conveying means 10, a limit switch composed of the receiving unit 35a and the transmitting unit 35b detects this and the control unit detects the conveying means by this signal. Stop the drive motor of 10). Next, the height of the omnidirectional conveying means 10 is lowered by the elevating means 33 so that the pipe P is placed on the chain of the lateral conveying means 20.

Next, in FIG. 8, the pipe P located on the chain of the lateral conveying means 20 is conveyed to the left end according to the movement of the chain. Subsequently, the pipe P is gathered along the roller 31 which is inclinedly arranged on the associated transfer means 31 connected to the transfer means 20, and is integrated by the packing part 700.

The packing part 700 includes a main body 710 moved left and right by a left and right moving member (not shown), and a lifting member 720 for adjusting the height of the electromagnet 730 provided on the bottom surface. .

When the electromagnet is lowered by the elevating member 720, and power is supplied to the electromagnet 730, pipes P are attached to the electromagnet. The electromagnet is lifted by the elevating member 720 again, and the body 710 is moved to the left side where the arthropod 740 is positioned by the left and right moving members, and then the elevating member 720 is lowered to the electromagnet 730. Pipes accumulate when the supplied power is interrupted.

Next, when the pipes accumulate to a certain degree, the pipes are bundled by using an automatic fastening machine or by hand.

The pipe inner surface coating apparatus described above with reference to the drawings including FIG. 1 is described according to a specific arrangement order, but those skilled in the art can modify the order and shape of each component in various ways based on the inner coating portion, the centering means, and the controller. The inner surface of the pipe can be painted. However, such modifications and combinations should also be construed as falling within the scope of the present invention.

As described above, the pipe inner coating method and the coating apparatus according to the present invention include a pipe inner coating process through a centering process and a centering means for aligning the pipes so as to coincide with the advancing direction of the nozzles introduced into the pipe inner surface for painting the pipe inner surface. Automation is possible.

In addition, the present invention continuously connects the cleaning, external coating, internal coating and drying process through various transfer parts such as an omnidirectional transfer means, a lateral transfer means, a direction change means, an in-position transfer means and a flipping means. The order of arrangement ensures the highest quality of the painted state on the outside of the pipe while minimizing energy loss.

As a result, it is possible to prevent the corrosion of the metal pipes through the automation of the inner surface coating process of the present invention and to provide a pipe having a good coating quality.

In addition, it is possible to significantly lower the internal coating pipe manufacturing cost by such an automated process, it is excellent in marketability.

Claims (18)

The nozzle is provided inside the pipe by means of a nozzle moving means for moving forward and backward along a rail for painting the inner surface of the pipe and a centering means for adjusting the position of the pipe from the outside so that the pipe can be aligned on the path of the nozzle. A centering process to allow the movement forward and backward; And And coating an inner surface of the pipe by injecting a nozzle into a center of the pipe aligned by the centering process. The method of claim 1, An outer coating process for painting the outer surface of the pipe using a nozzle through which paint is sprayed; And a drying step made before or after the outer coating step. The method of claim 1, An outer coating process for painting the outer surface of the pipe using a nozzle through which paint is sprayed; And a drying step made before or after the inner surface painting process. The method of claim 2 or 3, The drying step is a coating method of the inner surface of the pipe, characterized in that the drying step by heating. The method of claim 4, wherein The coating method of the inner surface of the pipe further comprises a washing step of washing the pipe by using a nozzle in which the cleaning liquid is injected before the drying step. The method of claim 2 or 3, The outer coating process includes a first outer coating process for painting an initial exposed surface of a pipe and a second outer coating process for painting an initial non-exposed surface, And a flipping step of inverting the pipe such that the initial non-exposed surface faces upward after the first outer surface coating process. The method of claim 6, Further comprising a washing process for cleaning the pipe by using a nozzle in which the cleaning liquid is injected, In this case, the process sequence of each process is a washing process, a first drying process by air spraying, a first outer coating process, a second drying process by heating, a centering process, an inner painting process, a flipping process and a second outer painting process Painting method of the inner surface of the pipe, characterized in that order. A paint storage tank for storing the paint, a compressor for providing a spray pressure so that the paint from the paint storage tank can be injected through the nozzle, a nozzle for injecting the paint provided by the compressor, and a nozzle for injecting the paint are defined. An inner coating portion consisting of a nozzle moving means for moving forward and backward along a predetermined path, And a centering means for adjusting the position of the pipe from outside so that the pipe can be aligned on the advance path of the nozzle so that the nozzle can move forward and backward in the center of the pipe. The method of claim 8, A transfer part for moving the pipe; A paint storage tank for storing paint and a compressor for providing a spray pressure so that the paint from the paint storage tank can be injected through the nozzle; a nozzle for spraying the paint provided by the compressor; and a nozzle from the paint storage tank and the compressor to the nozzle. Including a connecting pipe, and the coating device for the inner surface of the pipe further comprises an outer coating for painting the outer surface of the pipe conveyed by the transfer unit. The method of claim 9, The coating device of the inner surface of the pipe further comprises a drying unit for drying the surface painted in the outer coating and the inner coating. The method of claim 9, wherein the transfer unit A driving motor, a pulley and a belt for transmitting power of the driving motor, and a rotating roller connected to the pulley and driven by a motor rotating together with the pulley; A plurality of rotation rollers, each of which is connected to a rotation roller driven by the motor, in which a plurality of rotation rollers, which are continuously arranged at a predetermined interval, are connected together in a unit set with the rotation roller driven by the motor. ; And A drive motor, a rotating sprocket connected to the drive motor, a driven sprocket not connected to the drive motor, and a chain rotated along the rotating sprocket and the driven sprocket, and the pipe received from the omnidirectional transfer means Painting apparatus on the inner surface of the pipe comprising a lateral transfer means for feeding in the direction. The nozzle moving means of claim 8 or 9, wherein A carriage to which the nozzle is fixed; A guide rail for guiding the carriage to prevent the carriage from being separated from side to side; Guide means for supporting an end portion of the nozzle by a roller to allow the nozzle to move back and forth smoothly; Painting device of the inner surface of the pipe comprising a moving means for moving the carriage along the guide rail and the guide means. The method of claim 10, The outer coating part is divided into a first outer coating part for painting the initial exposed surface of the pipe, and a second outer coating part for painting the initial unexposed surface after the pipe is dried by the drying part, Painting apparatus for the inner surface of the pipe further comprises a flipping means for inverting the pipe so that the initial non-exposure surface is directed to the upper for painting in the second outer surface coating. The method of claim 13, wherein the flip means Drive motor; A rotating body connected to the rotating shaft of the drive motor; And It is provided to protrude radially to the rotating body, the coating device of the inner surface of the pipe, characterized in that it comprises an electromagnet is turned on / off by the control unit. The method according to any one of claims 13 and 14, Is provided in front of the first outer coating and the inner coating portion A storage tank storing the washing liquid, a compressor providing an injection pressure for spraying the washing liquid stored in the storage tank, an injection nozzle for spraying the washing liquid provided from the compressor, and a connection from the washing liquid storage tank to the spray nozzle It further comprises a washing unit including a tube, The drying unit is divided into a first drying unit for drying the washing liquid after the washing unit and a second drying unit for drying the paint painted on the outer coating unit and the inner coating unit. The method of claim 15, The arrangement order of each component Washing unit, first drying unit, first outer coating unit, second drying unit, inner coating unit, flipping means and second outer coating unit, Painting device on the inner surface of the pipe, characterized in that the conveying portion for distributing the pipe is disposed between each component. The method of claim 9, A supply means comprising a moving belt and a lifting member for moving the pipe stacked on the upper side to the transfer part; Unloading means comprising a driving member, a moving frame moving left and right by the driving member, and an electromagnet arranged in the moving frame toward a pipe located in the supply means; And a loading unit for positioning the pipes one by one to the transfer unit. The method of claim 9, It comprises a main body 710, the elevating member for the main body, the left and right moving member for the main body, an electromagnet arranged on the bottom of the main body and turned on / off by the control unit, And a packing part for packing the inner and outer surfaces of the pipe by drying and packaging the pipe collected at the last conveying part to allow packaging.