JP3791191B2 - Method and apparatus for painting metal pipe outer surface - Google Patents

Description

【００２２】
【発明の効果】
以上のように本発明によれば、長楕円形の吐出パターンを有するノズルチップを、その長径方向が金属管の管長方向と同方向になるように該金属管の上部管長方向に複数個配置し、該金属管を静止した状態でこれらのノズルチップを必要に応じて該金属管の管長方向と垂直の方向に移動させながら塗布することで、該金属管に対しては螺旋状の塗布とならず平面状の塗布となり、該金属管管長方向および円周方向の塗料塗布量分布を均一にすることができる。
また、該金属管の回転速度の正確な管理を必要とせず、さらに、各塗布ステージにおいてノズルチップを該金属管の管長方向と直交する方向に移動する移動範囲内で、該金属管を複数本同時に処理することで、処理能率を飛躍的に向上させることができ、工業上有用な効果がもたらされる。
【図面の簡単な説明】
【図１】本発明の実施の形態を示す金属管を管長方向に分割塗布する状態の概略図である。
【図２】本発明の実施の形態を示す金属管を円周方向に分割塗布する段階の説明図である。
【図３】本発明の実施の形態を示すノズルチップの長楕円形の吐出パターンの説明図である。
【図４】本発明の実施の形態を示す管長方向と塗料塗布量との関係のグラフ図である。
【図５】本発明の実施の形態を示す装置全体の概略構成の側面図である。
【図６】本発明の実施の形態を示すノズルチップの上下位置変更と金属管サイズとの関係の説明図である。
【図７】本発明の実施の形態を示す供給・回収・循環装置の説明図である。
【図８】従来の実施の形態を示す鋼管外面の塗装方法の概略説明図である。
【図９】従来の実施の形態を示す管長方向と塗料塗布量との関係のグラフ図である。
【符号の説明】
１ 金属管
２ ノズルチップ
３ レシプロ装置
４ 回転装置
５ 中間搬送装置
６ 前後搬送装置
７ 供給・回収・循環装置
８ 受け皿
９ 循環供給装置
１０ 局所排気装置
１１ａ 管長方向分割塗布範囲（１）
１１ｂ 管長方向分割塗布範囲（２）
１１ｃ 管長方向分割塗布範囲（３）
１１ｄ 管長方向分割塗布範囲（４）
１１ｅ 管長方向分割塗布範囲（５）
１１ｆ 管長方向分割塗布範囲（６）
１２ａ 円周方向分割塗布範囲（１）
１２ｂ 円周方向分割塗布範囲（２）
１２ｃ 円周方向分割塗布範囲（３）
１３ 第１の塗布ステージ
１４ 第２の塗布ステージ
１５ 吐出パターン[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a coating method and a coating apparatus for coating an outer surface of a metal pipe such as a steel pipe or a stainless pipe.
[0002]
[Prior art]
For example, in Japanese Laid-Open Patent Publication No. 4-66164, a metal for coating the outer surface of a steel pipe by coating and drying and curing a part of the pipe length direction of the steel pipe and then coating and drying and curing the remaining unpainted part. A method for painting the outer surface of a tube is disclosed. FIG. 8 is a schematic explanatory view of a method for painting an outer surface of a steel pipe showing the above-described conventional embodiment. In the figure, a metal tube 1 is rotatably supported by a rotating device 4, and a plurality of nozzle tips 2 are provided above the metal tube 1 so as to be movable along a tube length direction indicated by an arrow by a reciprocating device 3. Two systems of the first stage 13 and the second stage 14 are arranged in parallel.
[0003]
The metal tube 1 is supported by the rotating device 4 and is provided with the required rotation, and the reciprocating device 3 moves the plurality of nozzle tips 2 in the tube length direction indicated by the arrow while rotating the portions 11a to 11c in the tube length direction (rotation). A portion not supported by the apparatus 4 is applied by the first application stage 13. After the metal tube 1 has undergone a drying and curing process, a plurality of nozzle tips 2 are moved in the tube length direction indicated by an arrow by a reciprocating device 3 while a coating completion portion is supported by a rotating device 4 and given rotation is applied. Then, the entire length of the metal tube 1 is painted by applying the unpainted portions 11d to 11f in the tube length direction on the second coating stage 14 and drying and curing them.
[0004]
[Problems to be solved by the invention]
In the conventional method for coating the outer surface of the metal tube as described above, the coating of the coating from the nozzle tip 2 is performed while moving the reciprocating device 3 in the tube length direction indicated by the arrow while applying the required rotation to the metal tube 1. As shown in FIG. 9, the pipe 1 is spirally coated, and the distribution of the coating amount in the tube length direction in each of the divided coating ranges 11a to 11f becomes nonuniform as shown in FIG.
[0005]
Moreover, if the rotational speed of the metal tube 1 and the moving speed of the reciprocating device 3 are not kept relatively constant, the amount of coating in the tube length direction and the circumferential direction within the respective coating ranges of the divided coating ranges 11a to 11f. Since the distribution becomes non-uniform, it is necessary to accurately manage the rotational speed of the metal tube 1 and the moving speed of the reciprocating device 3.
Furthermore, since the processing of the metal tube 1 at each coating stage 13 and 14 is performed in units of one, there is a problem that the processing efficiency is very poor.
[0006]
The present invention has been made in order to solve such problems. The distribution of coating amount in the pipe length direction and the circumferential direction of the metal pipe, accurate metal pipe rotation speed and reciprocating device movement speed management, etc. An object of the present invention is to provide a coating method and a coating apparatus for the outer surface of a metal pipe that can be applied uniformly without being required and can ensure high processing efficiency.
[0007]
[Means for Solving the Problems]
The method for coating the outer surface of a metal tube according to the present invention includes a plurality of nozzle tips having an elliptical discharge pattern in the upper tube length direction of the metal tube so that the major axis direction of the discharge pattern is the same as the tube length direction of the metal tube. One or a plurality of coatings in divided units in which the nozzle tip is moved in a direction perpendicular to the tube length direction of the metal tube to divide the tube length direction into a plurality of ranges and the circumferential direction is divided into a plurality of ranges. After the metal tube is stationary and repeated in the circumferential direction repeatedly after completion of the coating, drying and curing of the entire circumference of the metal tube, the metal tube is supported at the completed portion, and the remaining divided range in the tube length direction is coated, dried and cured.
[0008]
The metal tube coating apparatus according to the present invention includes a nozzle tip in which a major axis direction of an oblong discharge pattern coincides with a tube length direction of the metal tube, and a plurality of nozzle tips arranged in the upper tube length direction of the metal tube; The reciprocating device having a lifting function that reciprocates in the direction perpendicular to the tube length direction of the metal tube and makes the relative distance to the metal tube constant according to the outer shape of the metal tube, and one or more metal tubes simultaneously Two systems of equipment provided with a rotating device that is rotatably supported are arranged side by side, a front-rear conveying device that supplies or discharges metal pipes continuously or discontinuously between the two systems and before and after the two systems, A supply / recovery / circulation device and a local exhaust device surrounding each of the two systems are provided.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a schematic view of a state in which a metal tube showing an embodiment of the present invention is divided and applied in the tube length direction, and FIG. 2 is a stage of dividing and applying a metal tube showing the embodiment of the present invention in the circumferential direction. FIG. 3 is an explanatory diagram of an oblong discharge pattern of a nozzle tip showing an embodiment of the present invention, and FIG. 4 is a graph of the relationship between the tube length direction and the coating amount of the coating according to the embodiment of the present invention. is there. In the drawing, a metal tube 1 is supported by a rotating device 4 so that the nozzle tip 2 is supported by a reciprocating device 3 and is parallel to the lower side arranged in a row. The nozzle tip 2 includes a tube length direction divided application range (1) 11a, a tube length direction divided application range (3) 11c, and a tube central portion of the range in which the metal tube 1 is divided into five in the tube length direction. Tube length direction division coating range (2) 11b, the first coating stage 13, the tube length direction division coating range (1) 11a, the tube length direction division coating range (3) 11c, and the tube length direction at the center of the tube From the two-stage process of the second coating stage 14 in which the tube length direction divided coating range (4) 11d and the tube length direction divided coating range (5) 11e are coated between the divided coating range (2) 11b. It has become.
[0010]
In both the first coating stage 13 and the second coating stage 14, a portion of the stage where the metal tube 1 is not coated is rotatably supported by the rotating device 4.
That is, in the 1st application | coating stage 13, the position which avoided the pipe length direction division | segmentation application range (1) 11a-pipe length direction division | segmentation application | coating range (3) 11c of the metal pipe 1 is rotatably supported by the rotation apparatus 4, and 2nd In the coating stage 14, a position avoiding the tube length direction divided coating range (4) 11d and the tube length direction divided coating range (5) 11e, that is, a position where the division coating has already been performed in the first coating stage 13 and the drying and curing are completed ( The tube length direction divided application range (1) 11a to the tube length direction divided application range (3) 11c) are supported by the rotating device 4.
[0011]
In any of the steps of the first coating stage 13 and the second coating stage 14, the circumferential direction is divided into three parts here with respect to the painted surface of the metal tube 1 to be coated as shown in FIG. First, after coating the circumferentially divided coating range (1) 12a by moving the nozzle tip 2 in a direction perpendicular to the tube length direction of the metal tube 1 while the metal tube 1 is stationary, the metal tube 1 is subsequently applied. After rotating by managing the amount of rotation in the circumferential direction in divided units, the circumferentially divided coating area 12b is similarly applied in a stationary state, and then the metal tube 1 is rotated in the circumferential direction in divided units. Only the amount is controlled and rotated, and the circumferentially divided application range 12c is similarly applied in a stationary state. The entire circumference of the metal tube 1 is applied by alternately repeating the circumferential rotation of the metal tube 1 and the moving application of the nozzle tip 2.
[0012]
The nozzle tip 2 coats the tube length direction divided application range (1) 11a, the tube length direction divided application range (3) 11c, and the tube length direction divided application range (2) 11b at the center of the tube. 1 stage 13, the tube length direction divided coating range (1) 11a, the tube length direction divided coating range (3) 11c, and the tube length direction divided coating range (2) 11b at the center of the tube. In any process of the second stage 14 for coating the divided coating range (4) 11d and the pipe length direction divided coating range (5) 11e, the oblong shape shown in FIG. The discharge pattern is arranged so that the major axis direction of the discharge pattern is the same as the tube length direction of the metal tube 1. FIG. 4 shows the distribution of the coating amount in the tube length direction by the oblong discharge pattern, and the coating amount distribution is extremely good.
[0013]
In the above embodiment, a plurality of nozzle chips 2 having an elliptical discharge pattern are arranged in the upper tube length direction of the metal tube 1 so that the major axis direction is the same as the tube length direction of the metal tube 1. By applying the nozzle tip 2 while moving the nozzle tip 2 in a direction perpendicular to the tube length direction of the metal tube 1 without rotating the metal tube 1, the metal tube 1 is spirally applied. Therefore, the distribution in the pipe length direction in each of the divided application ranges can be made uniform, and the single metal tube 1 can be applied to the painted surface in a stationary state. After painting one division unit that divides the circumferential direction into at least three divisions, the metal tube is rotated in the circumferential direction by the division unit, and the nozzle tip 2 is again set in a direction orthogonal to the tube length direction of the metal tube 1. Move and apply, the circumference of the metal tube 1 By applying the entire circumference of the metal tube 1 by alternately repeating the direction-division rotation and the movement application of the nozzle tip 2 in the tube length direction, accurate management of the rotation speed of the metal tube 1 is not required, The coating amount distribution in the tube length direction and the circumferential direction of the metal tube 1 can be made uniform.
Furthermore, by simultaneously processing a plurality of metal tubes 1 within a moving range in which the nozzle tip 2 is moved in a direction perpendicular to the tube length direction of the metal tube 1 in each coating stage 13 and 14, the processing efficiency is dramatically improved. Can be improved.
[0014]
In the first coating stage 13 and the second coating stage 14, the reciprocating device 3 moves the nozzle tip 2 relative to the metal tube 1 in a direction orthogonal to the tube length direction of the metal tube 1 as shown in FIG. 5. Is provided. Within the range of movement of the reciprocating device 3, a plurality of metal tubes 1, here three, can be processed simultaneously. Between the first coating stage 13 and the second coating stage 14, for example, an intermediate transport device 5 configured by a carriage mechanism is connected to the transport line by the front and rear transport device 6 before and after that, and these are connected to each other. The smooth process related to the outer surface coating of the metal tube 1 is performed. In each of the first coating stage 13 and the second coating stage 14, a local exhaust device 10 is provided to prevent the paint mist, solvent, and the like from diffusing around and contaminating the atmosphere.
[0015]
Furthermore, as shown in FIG. 6, the reciprocating device 3 is provided so that the nozzle tip 2 can be raised and lowered in order to make the relative distance from the metal tube 1 constant. With this function, the coating condition of the paint can be made the same with respect to the change in the outer diameter of the metal tube 1.
[0016]
Further, as shown in FIG. 7, a coating material supply / collection / circulation device 7 is provided, and the coating material discharged from the nozzle tip 2 that has not been applied to the metal tube 1 is collected by the tray 8 and circulated and supplied. The apparatus 9 is configured to be circulated.
[0017]
In the embodiment described above, the pipe length direction division of the coating surface of the metal tube 1 is set to five. However, the division may be at least three or more, and the pipe length direction division coating of each of the coating stages 13 and 14 may be performed. The number of nozzle tips 2 is one for each range, but a plurality of nozzle tips 2 may be used. The number of nozzle tips 2 is determined in consideration of the tube length of the metal tube 1 and the length of the long elliptical discharge pattern of the nozzle tip 2. Also good.
[0018]
Further, although the number of simultaneous processing of the metal pipes 1 is set to three within the moving range of the reciprocating device 3, it can be adjusted to the required number of simultaneous processing by adjusting the moving range of the reciprocating device 3.
[0019]
Furthermore, although the circumferential division range of the painted surface of the metal tube 1 is three, the division may be at least three or more, and may be appropriately selected according to the application size of the metal tube 1 and the like.
[0020]
【Example】
Example 1.
Table 1 shows the results of external coating according to the present invention and the prior art. As can be seen from Table 1, in the prior art, the distribution of the coating film thickness is large due to the poor distribution of the coating amount in the tube length direction, and the accurate rotation speed and the distribution of the coating film thickness in the circumferential direction are Only when reciprocating movement speed management is performed is a situation where a level equivalent to that of the present invention can be obtained, and the processing efficiency is very low.
On the other hand, in the present invention, the distribution of the coating film thickness is good both in the tube length direction and the circumferential direction, and the processing efficiency is dramatically improved.
[0021]
[Table 1]

[0022]
【The invention's effect】
As described above, according to the present invention, a plurality of nozzle chips having an elliptical discharge pattern are arranged in the upper tube length direction of the metal tube so that the major axis direction is the same as the tube length direction of the metal tube. By applying the nozzle tip while moving the nozzle tip in a direction perpendicular to the tube length direction of the metal tube as necessary, the metal tube is kept in a spiral shape. Thus, the coating is flat and the coating amount distribution in the metal tube length direction and the circumferential direction can be made uniform.
In addition, accurate management of the rotation speed of the metal tube is not required, and a plurality of metal tubes are provided within a moving range in which the nozzle tip is moved in a direction perpendicular to the tube length direction of the metal tube in each coating stage. By processing at the same time, the processing efficiency can be drastically improved, and an industrially useful effect is brought about.
[Brief description of the drawings]
FIG. 1 is a schematic view showing a state in which a metal tube according to an embodiment of the present invention is divided and applied in the tube length direction.
FIG. 2 is an explanatory diagram of a stage in which a metal tube according to an embodiment of the present invention is divided and applied in the circumferential direction.
FIG. 3 is an explanatory diagram of an ellipse-shaped ejection pattern of a nozzle chip showing an embodiment of the present invention.
FIG. 4 is a graph showing the relationship between the pipe length direction and the amount of paint applied, showing an embodiment of the present invention.
FIG. 5 is a side view of a schematic configuration of the entire apparatus showing an embodiment of the present invention.
FIG. 6 is an explanatory diagram of the relationship between the change in the vertical position of the nozzle tip and the metal tube size according to the embodiment of the present invention.
FIG. 7 is an explanatory view of a supply / recovery / circulation device showing an embodiment of the present invention.
FIG. 8 is a schematic explanatory diagram of a method of painting an outer surface of a steel pipe showing a conventional embodiment.
FIG. 9 is a graph showing the relationship between the pipe length direction and the coating amount, showing a conventional embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Metal pipe 2 Nozzle tip 3 Reciprocating device 4 Rotating device 5 Intermediate conveyance device 6 Front / rear conveyance device 7 Supply / collection / circulation device 8 Sauce tray 9 Circulation supply device 10 Local exhaust device 11a Pipe length direction division coating range (1)
11b Pipe length direction division coating range (2)
11c Pipe length direction division coating range (3)
11d Pipe length direction division coating range (4)
11e Pipe length direction division coating range (5)
11f Pipe length direction division coating range (6)
12a Circumferential direction division coating range (1)
12b Circumferential direction division coating range (2)
12c Circumferential direction division coating range (3)
13 First coating stage 14 Second coating stage 15 Discharge pattern

Claims (2)

A plurality of nozzle tips having an elliptical discharge pattern are arranged in the upper tube length direction of the metal tube so that the major axis direction of the discharge pattern is the same as the tube length direction of the metal tube. The pipe length direction is divided into a plurality of ranges by moving in a direction perpendicular to the direction, and the coating in divided units in which the circumferential direction is divided into a plurality of ranges is applied in the circumferential direction with one or more metal tubes stationary. A coating method for an outer surface of a metal tube, characterized in that after the completion of coating and drying of the entire circumference of the metal tube, the metal tube is supported at the completed portion and the remaining divided range in the tube length direction is coated and dried and cured. A nozzle tip in which the major axis direction of the elliptical discharge pattern coincides with the tube length direction of the metal tube and a plurality of nozzle tips are arranged in the upper tube length direction of the metal tube, and the nozzle tip reciprocates in a direction perpendicular to the tube length direction of the metal tube. And a reciprocating device having a lifting and lowering function that makes the relative distance from the metal tube constant according to the outer shape of the metal tube, and a rotating device that rotatably supports one or more metal tubes simultaneously. Two systems are juxtaposed, a front / rear transport device that supplies or discharges metal pipes continuously or discontinuously between the two systems and before and after the two systems, a paint supply / recovery / circulation device, and each of the two systems An apparatus for painting an outer surface of a metal pipe, comprising a local exhaust device surrounding the device.

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