JP4377015B2 - Color change painting method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a color change coating method that enables continuous coating while sequentially switching to different coating colors depending on an object to be coated in a coating line.
[0002]
[Prior art and its problems]
Conventionally, painting with a colored paint measures the base paint and the color paint at a certain ratio so as to achieve the target color, mixes them well in a mixing tank, adjusts the color, and then performs this color adjustment. This was done by spraying the used paint from a paint gun. For example, in ship-holding, when performing anticorrosion coating of shipbuilding steel (shop primer coating), the base paint was gray and the color paint was red or green, depending on the type of steel and painting .
[0003]
However, the above method requires a device for automatically weighing and uniformly mixing the base paint and the color paint, which not only increases the equipment cost, but also requires a large mixing tank and requires a large installation space. In addition, there is a problem in that a large amount of remaining paint in the mixing tank is discarded and the inside of the tank is cleaned with a large amount of organic solvent when changing the color of the coating.
[0004]
Especially in the ship hold, the paint tank is large due to the size of the steel material, and the man-hours for disposal and tank cleaning of the paint are enormous.Furthermore, the various steel materials to be transported are washed and drained after each lot of paint tank. In order to perform color-coded coating, it is necessary to sort various steel materials by type, and there is also a problem that a crane apparatus for sorting work, a large space (yard), and a large number of man-hours are required.
[0005]
SUMMARY OF THE INVENTION An object of the present invention is to provide a color changing coating method that can be changed to a different coating color instantaneously in a coating line, and that can be continuously applied while sequentially switching even different coating colors depending on the object to be coated.
[0006]
[Means for Solving the Problems]
In the present invention, markings for designating coating colors are preliminarily applied to various objects to be conveyed by a conveyor, or the markings are detected, and the markings are detected by a sensor. A painting device that operates in accordance with a command for each designated coating color to be sent, mixes two or more paints of different colors, and paints each designated coating color. The painting device sprays a base paint. And a second coating part having an injection hole for injecting a color paint having a color different from that of the base paint, the first paint part being an airless gun, and a second paint part. The part is a two-fluid nozzle, and the first paint part and the second paint part are arranged so that the spraying directions intersect each other, and the base paint spray amount is sprayed to be larger than the color paint spray amount. Base paint and The present invention provides a color-changing coating method characterized by being a color-mixing coating apparatus configured to collide with a color paint and enter a mixed state.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
In the present invention, first, if the markings for designating the coating color are not previously provided on the various objects to be conveyed by the conveyor, the markings are respectively performed. The marking portion is detected by a sensor such as a CCD camera. The detection signal is sent to the control panel, and the type of marking is recognized. As a result, a command for painting the designated paint color is sent from the control panel to the painting apparatus. Along with the command, in the coating line, for example, the shape sensor detects the shape and size of the object to be coated, and the control panel sends a coating discharge ON / OFF command to the coating apparatus. The coating apparatus operates in accordance with the command, and each designated coating color is applied.
[0008]
The coating apparatus used in the present invention is an apparatus for coating by mixing two or more paints having different colors, and includes a first paint part having an injection hole for injecting the base paint, and a color having a color different from that of the base paint. And a second paint part having an injection hole for injecting paint, the first paint part and the second paint part being arranged so that the spray directions intersect, and the injected base paint and color paint collide with each other. Thus, the color mixing coating apparatus is configured to be in a mixed state.
[0009]
Hereinafter, an example of the coating apparatus will be described with reference to FIGS. FIG. 1 is a perspective view showing an example of the coating apparatus, and FIG. 2 is a plan view thereof.
[0010]
The coating apparatus 1 includes a first coating unit 10 that sprays a base paint and two second coating units 20 that spray a color paint having a color different from that of the base paint. Various materials can be used for the base paint and the color paint. The viscosity of the base paint and the color paint is 10 to 5000 mPa · s, preferably 100 to 1000 mPa · s. The colors of the base paint and the color paint can be selected arbitrarily in consideration of the harmony between the two. For example, in a rust preventive coating of a steel plate in a ship hold, the base paint is often white or gray and the color paint is red rust or green, but is not limited thereto.
[0011]
The first coating part 10 is a known airless gun in which a nozzle 14 is provided at the center of the tip of the main body part 12, and a needle valve (not shown) is provided inside the nozzle 14. And when this needle valve opens by the action | operation of the air electromagnetic valve 32, the supplied base coating material B is comprised by the hydraulic pressure. A nozzle tip 16 having an ejection groove 18 is attached to the tip of the nozzle 14. As shown in the cross-sectional view of FIG. 3, the spray groove 18 is formed so that the spray hole 17 of the paint is opened in the bottom portion 18a and is orthogonal to the axial direction of the spray hole 17, and has a substantially V-shaped longitudinal section. It has a surface shape. The base paint discharged from the spray hole 17 is sprayed while spreading along the side surface 18b of the spray groove 18.
[0012]
The second coating unit 20 can be a known two-fluid nozzle, and the air A supplied to the air inlet 22 and the color paint C supplied to the liquid inlet 24 are mixed inside the nozzle. Then, like the 1st coating part 10, it is comprised so that it may inject from the injection groove 28 via the injection hole (not shown) formed in the nozzle chip 26. FIG. The color paint injection is turned on / off by the operation or stop of the valve 34 provided in the air pipe and the pump 36 provided in the paint pipe. It is controlled by a controller (not shown) that adjusts the discharge amount of the pump 36. It is preferable that the spray angle of the 2nd coating part 20 is 20-40 degrees.
[0013]
The second coating portion 20 is provided on both sides of the nozzle 14 of the first coating portion 10 via a plate-like bracket 40, and one end side of the bracket 40 is attached to the first coating portion 10 by a screw 42. It is swingably attached. Thereby, the inclination angle θ of the spraying direction of the second coating part 20 with respect to the spraying direction of the first coating part 10 can be adjusted to an arbitrary angle, and the color paint can collide with the sprayed base paint. It is preferable that the axis of each injection hole in the first coating part 10 and the second coating part 20 be in the same plane so that the collision area between the base paint and the color paint is increased. It is preferable that the direction (direction in the direction perpendicular to the axis of each corresponding injection hole) be substantially parallel.
[0014]
In the coating apparatus having such a configuration, first, the spraying direction of the second coating unit 20 is inclined with respect to the spraying direction of the first coating unit 10, and the base paint and the color paint collide with each other before being sprayed on the object to be coated. Let Since the spray amount of the base paint is generally much larger than the spray amount of the color paint, the color paint particles colliding with the base paint particles get mixed with the base paint and ride on the base paint flow to reach the substrate. To do. In this way, the base paint and the color paint are mixed to form a coating film having a desired color.
[0015]
Further, when the shape of the ejection grooves 18 and 28 is changed by the replacement of the nozzle tips 16 and 26, or the viscosity of the base paint or the color paint changes, the inclination angle θ of the second coating part 20 is appropriately adjusted. The base paint and the color paint can collide with each other at a desired position. This collision position is preferably a distance of 10 to 50 cm from the surface to be coated. The collision position of the color paint on the base paint does not necessarily need to be matched between the two second paint portions 20, and can be different positions.
[0016]
The coating film formed in this way is slightly inferior in terms of aesthetics compared to a coating film that has been sufficiently mixed in advance in the tank or the like, but if so high toning accuracy is not required, the color mixture state Is sufficient. For example, in the case of shop primer coating, this coating method can be used to identify the type of steel sheet by the color of the shop primer, while a plurality of coating films are formed on the surface of the shop primer. The color does not affect the appearance of the finished product.
[0017]
As described above, the coating apparatus used in the method of the present invention has been described in detail. However, instead of using an airless gun, the first coating unit 10 may use a known air spray gun that sprays paint by a compressed air flow. . In general, an air spray gun is used at an injection amount of 50 to 500 cc per minute, and an airless gun is used at an injection amount of 1000 to 2500 cc per minute. For the second coating part 20, an airless gun can be used instead of the two-fluid nozzle.
[0018]
In the above description, the second coating portion 20 is fixedly attached to the bracket 40. However, as shown in FIG. 4, a long hole 44 is formed in the bracket 40 so that it can move along the long hole 44. The second painting part 20 may be attached. Accordingly, not only the inclination angle θ of the second coating portion 20 but also the position thereof can be adjusted, so that the collision position between the base paint and the color paint can be adjusted more easily and accurately.
[0019]
Further, it is not always necessary to provide two second coating portions 20 as described above, and it is possible to use only one or two or more. By providing a plurality of second coating portions 20 in this manner, the collision positions of the jet flow of the base paint and the jet flow of the color paint can be dispersed, and better color mixing can be obtained.
[0020]
In the method of the present invention, it is easy and quick to change the color of the paint by selecting one or more paints that are actually sprayed, in particular so that paints of different colors are jetted from the second paint section 20 respectively. In addition, it is possible to greatly expand the paint color variations by combining multiple colors. When three or more second coating portions 20 are provided, for example, the nozzles 14 in the first coating portion 10 may be swingably attached to the left and right and upper and lower sides of the nozzle 14 via brackets, or the bracket shown in FIG. Two or more long holes 44 may be provided.
[0021]
The above-mentioned painting apparatus is usually installed by being supported by a painting arm or the like in an exhaust duct serving as a painting space and subjected to reciprocating motion.
[0022]
As described above, in the method of the present invention, the coating apparatus controls the discharge amount of each paint from the first coating unit and the second coating unit so as to achieve the coating color specified by the object to be coated. It is possible to paint continuously while switching colors. The above-described coating apparatus does not exclude the case where only the base paint is applied with the discharge amount of the second coating portion set to zero.
[0023]
It is possible to constantly monitor whether the object coated by the above-mentioned coating apparatus is coated in an appropriate color by a coating color confirmation sensor provided in the coating line. If the paint color is not appropriate, it is detected by the sensor, the conveyor is stopped by the control panel, and the paint line can be restarted by taking measures according to the cause.
[0024]
【Example】
Example 1
FIG. 5 is a schematic explanatory view of a shop primer coating line based on an embodiment of the method of the present invention.
[0025]
In FIG. 5, the steel material 50 mounted on the conveyor 52 directly from the ship (not shown) is first subjected to the marking 51 for designating the coating color depending on the type after the water washing / draining process (area 53). 54). For example, one line for gray, two lines for red rust, and three lines for green are marked on the steel plate 50 with magic.
The marking 51 is detected by a sensor 55 (CCD camera), and the detection signal is sent to the control panel 56 to recognize the type of marking. Thus, a command for painting the designated paint color is sent from the control panel 56 to the painting apparatus 1. On the other hand, the steel material 50 is subjected to a shot blasting process (area 57) before painting.
[0026]
Subsequently, the shape sensor 58 detects the shape and size of the steel material 50, and the control panel 56 sends a paint discharge ON / OFF command to the coating apparatus 1. The coating apparatus 1 operates in accordance with the command, and each designated coating color is applied.
[0027]
The painting apparatus 1 is installed and supported by a painting arm (not shown) in an exhaust duct 59 serving as a painting space, and is subjected to reciprocating motion. The coating apparatus 1 includes a first coating unit 10 that sprays the base paint B, and a second coating unit 20 that sprays color paints C1 and C2 that are different in color from the base paint B. It is a color mixing coating apparatus shown in FIG. An airless gun is used for the first coating unit 10, and a two-fluid nozzle is used for the second coating unit 20. The base coating B is sent from the tank 60 to the first coating unit 10 through the coating pipe having the airless pump 61, and the coating having the diaphragm pumps 64, 65 from the tanks 62, 63 to the second coating unit 20. The color paints C1 and C2 are respectively switched by the color change valve 66 by the pipe and are sent together with the air A from the air supply device (not shown). At the time of color switching, a cleaning thinner 67 is sent to the color change valve 66 and the second coating unit 20. The steel plate coated by the coating apparatus 1 is constantly monitored by a coating color confirmation sensor 68 to monitor whether it is coated in an appropriate color.
[0028]
Here, an airless automatic gun “AG gun” manufactured by Asahi Sunac Co. is used for the first coating unit 10, and an “airless chip 821” manufactured by Nippon Gray Co., Ltd. is used for the nozzle tip 16 of the first coating unit 10. A “mini mist”, which is a two-fluid nozzle made of Everloy, was used for the two coating portion 20, and the distance between the two nozzle tips 26 was adjusted to 3 cm, and the inclination angle θ of the second coating portion 20 was adjusted to 30 degrees. As the base paint B, “SD Zinc 1000HA (S) Gray”, which is a gray paint manufactured by Kansai Paint, is used, and “SD Zinc 1000HA (S), which is a red rust color paint, manufactured by Kansai Paint, Ltd., is used as the color paint C1. “Red rust paste” was used, and “SD zinc 1000HA (S) green paste”, which is a green paint manufactured by Kansai Paint Co., Ltd., was used as the color paint C2. Furthermore, “color discrimination sensor PI-C” manufactured by KEYENCE Corp. was used as a sensor for confirming the coating color.
[0029]
The first paint part 10 has a hydraulic pressure of 6-8 MPa, the base paint spray amount 1400-1700 g / min, the second paint part 20 atomizing air pressure 0.3-0.4 MPa, and the color paint spray amount Was 40 to 60 g per minute per nozzle, and the distance to the steel plate was 20 to 40 cm.
[0030]
When the coating line was operated as described above, the color was instantly changed for each steel plate to be conveyed, and the color mixing property of each coating color was good.
[0031]
【The invention's effect】
According to the method of the present invention, it is possible to instantaneously change to a different paint color in the painting line without preparing paint in a mixing tank or the like as in the past, and even sequentially switch between different paint colors depending on the object to be coated. Color change paint that can be painted continuously is possible. In particular, in the case of ship hold, sorting for each paint color is not necessary, and significant equipment and man-hours can be saved.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an example of a coating apparatus used in the present invention.
FIG. 2 is a plan view of the coating apparatus shown in FIG.
FIG. 3 is a cross-sectional view of a main part of the coating apparatus shown in FIG.
FIG. 4 is an assembled perspective view showing a part of another coating apparatus used in the present invention.
FIG. 5 is a schematic explanatory diagram of a coating line based on an embodiment of the method of the present invention. (Top view)
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Coating apparatus 10 1st coating part 16 Nozzle tip 17 Injection hole 18 Injection groove 20 2nd coating part 22 Air inlet 24 Fluid inlet 26 Nozzle tip 28 Injection groove 40 Bracket 42 Screw 44 Long hole (theta) Inclination angle A Air B Base Paint C Color paint 50 Steel plate 51 Marking 52 Conveyor 53 Drainage area 54 Marking area 55 Sensor 56 Control panel 57 Shot blast area 58 Shape sensor 59 Exhaust duct 60 Base paint tank 61 Airless pump 62 (Red rust color) Color paint tank 63 (Green) Color paint tanks 64, 65 Diaphragm pump 66 Color change valve 67 Thinner for cleaning 68 Paint color confirmation sensor

Claims (3)

Marks that specify the coating color are pre-marked on the various objects to be transported by the conveyor, or the markings are performed, and the markings are detected by sensors and sent from the control panel in response to the detection signals. A coating device is operated in accordance with a coating color command, and two or more paints having different colors are mixed to apply each designated coating color. The coating device has an injection hole for injecting a base coating material. And a second coating part having an injection hole for injecting a color paint having a color different from that of the base paint . The first paint part is an airless gun, and the second paint part has two fluids. A base paint sprayed such that the first paint part and the second paint part intersect with each other in the spray direction, and the spray amount of the base paint is larger than the spray amount of the color paint; Color paint Color changing coating method which is a mixed color coating apparatus which is configured to be mixed state collide. The color change coating method according to claim 1, wherein the coating apparatus includes a plurality of second coating portions. The color change coating method according to claim 1 or 2 , wherein a coating color confirmation sensor is provided after coating.

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