JP3969953B2 - Toning method for multiple nozzles in coating equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a color matching method for multiple nozzles in a coating apparatus.
[0002]
[Prior art]
The fiber reinforced cement board that is widely used as an outer wall material is gray-white to gray-black in color and has a poor design, so it can be decorated with various colors to provide surface waterproofing. Is called.
[0003]
By the way, as a means for automatically coating the surface of these outer wall materials, a large number of spray nozzles are arranged in a direction orthogonal to the direction of transfer of the outer wall materials, and intermittently based on control signals from the spray nozzles along with the transfer of the plate materials. In some cases, the paint is sprayed to form a circular or elliptical colored coating on the surface of the outer wall material, and these circular to elliptical spray patterns provide a richly decorated design with colors and patterns integrated as a whole.
[0004]
[Problems to be solved by the invention]
When the circular to elliptical coating is performed by the large number of spray nozzles, the spray injection control of the spray nozzles is very important.
[0005]
As a control method, for example, in order to adjust the discharge amount of the spray nozzle, for example, a flow meter is conventionally attached to a plurality of spray nozzles (for example, JP-A-10-66193).
[0006]
However, when a flow meter is attached to each spray nozzle in this way, the volume of one spray nozzle is increased, and not only the overall volume is increased when a large number of spray nozzles are arranged. Since the other regulators are required, the volume of the spray nozzle is further increased, which makes it difficult to reduce the interval between the spray nozzles, making it difficult to draw a fine spray pattern densely. there were.
[0007]
Furthermore, the paint supply control is performed by adjusting the paint supply amount with the above flow meter, or adjusting the paint supply pressure with a regulator, and the control is performed automatically by feeding back the pressure value and flow rate value. However, when painting in a circular to elliptical shape as described above, the total number of nozzles often exceeds several hundreds, and it is considerable to provide the control circuit for each of such a large number of nozzles. There is a problem that it takes time and it takes time to complete the adjustment.
[0008]
An object of the present invention is to solve the above-mentioned problems and to adjust the discharge amount of paint and to control the change of gradation of grayscale quickly despite the large number of spray nozzles.
[0009]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the method for color-adjusting a number of nozzles in the coating apparatus according to claim 1 is such that the spray pattern sprayed on the surface of the outer wall material is a circle to an ellipse, and the spray nozzle is orthogonal to the transfer direction of the outer wall material. A number of colors are arranged in the direction, and the color pattern is controlled while controlling the spraying time so that a light color with a short spraying time and a dark circular to elliptical spray pattern with a longer spraying time are drawn according to the shade of the paint. In the color matching method of a number of nozzles in the coating device for the outer wall material to be attached ,
When toning a large number of spray nozzles, the coating device is actually driven on the prepared object according to the drawing program for evaluation, and a test pattern relating to color, brightness, and density is applied, and the surface of the object is measured with a color difference meter. To measure and evaluate at
Based on the evaluation related to the density, color adjustment of the drawing density for each spray nozzle arranged in a large number is performed by adjusting the needle stroke of each spray nozzle and changing the drawing data,
Based on the evaluation relating to the color and tone, the color adjustment of the color and tone of the entire spray nozzle is performed by adjusting and decreasing the paint supply pressure supplied to the entire spray nozzle, and the needle opening and closing operation according to the program. When the color tone drawn by the method is partially changed, the needle operating voltage is adjusted via a conversion table in which the ratio of output to input is variable.
[0010]
Therefore, according to the method of the present invention, the discharge amount of a large number of spray nozzles is dealt with by changing the opening / closing stroke of the needle and the drawing data without using a flow meter or a regulator. The speed can be reduced, the apparatus can be miniaturized, and the decorative pattern obtained can be equal to or better than the conventional one.
[0011]
The multi-nozzle toning method for the coating apparatus according to claim 2 is the multi-nozzle toning method for the coating apparatus according to claim 1, wherein the coating apparatus continues in the orthogonal direction without substantially interrupting the spray pattern. A large number of spray nozzles arranged in one group are provided, and two or more groups of such spray nozzles are provided according to the colors, and the paints of these two or more colors are applied as necessary. It uses something that has been made so that it can be mixed.
[0012]
Therefore, a multicolor shading pattern can be easily implemented.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of the present invention will be described.
FIG. 1 is a plan view of a coating apparatus for carrying out the method of the present invention, FIG. 2 is a front view of the apparatus, and FIG. 3 is an enlarged side view of an essential part of a spray nozzle.
[0014]
1 and 2, reference numerals 1... 1 denote a plurality of spray nozzles, which are supported by a base frame 20 on a conveyor 11 to which the outer wall material 10 is transferred, in a direction perpendicular to the transfer direction.
[0015]
The base frame 20 has a beam member 20a arranged orthogonally on the conveyor 11 and brackets 20b... 20b (FIG. 2) attached to the beam member 20a with fastening members 20c such as bolts. 1... 1 is supported by the beam member 20a through the brackets 20b.
[0016]
The girder member 20a has an arch member 20d, and can be adjusted and moved up and down by an electric jack (not shown) from a support base frame (not shown).
Two transport conveyors 11 are provided in parallel to speed up the coating process, and the spray nozzle 1 is supported by the base frame 20 and arranged.
[0017]
In the figure, reference numeral 14 denotes a cleaning brush for the spray nozzles 1..., Which is rotated when necessary and reciprocated along the spray nozzle 1.
In FIG. 1, the spray pattern 1a on the surface of the outer wall material 10 of each spray nozzle 1 is such that the pattern drawn by the jet flow Z from the spray nozzle 1 is circular or elliptical as shown in FIG. Is preferably 6 mm to 15 mm, and in the illustrated example, it has a circular or elliptical shape with a diameter D = 10 mm, and when the outer wall material 10 is transferred, the spray pattern 1a is sprayed intermittently to move in the transfer direction ( It is made to inject so that it may continue in a row in the arrow.
[0018]
Moreover, in order to draw the spray pattern 1a, it sprays intermittently at the space | interval P, and is intermittently sprayed over the length L of an outer wall material.
As shown in FIG. 3, the spray nozzle 1 includes a base body 1d and a cover plate 1b having a spray port 1c for spraying paint in a spray form. The base body 1d includes an atomizing air passage 2. And the paint passage 3 are formed concentrically, and an atomizing air supply port 4 and a paint supply port 5 communicating with the respective passages 2 and 3 are provided.
[0019]
Further, the spray ports 1c of the cover plate 1b are concentrically positioned and fixed to the openings of the atomizing air passage 2 and the paint passage 3 of the base body 1d of the spray nozzle 1.
An opening / closing needle 6 whose tip is sharpened conically with respect to the spraying port 1c is disposed concentrically with respect to the paint passage 3, and the opening / closing needle 6 is inserted into or exposed to the spraying port 1c. In this state, it can be moved in the direction indicated by the arrow in the axial direction.
[0020]
The open / close needle 6 has a rear end directly fixed to the plunger 8 of the solenoid 7, and the movement of the plunger 8 operated by the solenoid 7 is directly transmitted to the open / close needle 6.
[0021]
When the needle 6 is pulled in, the amount of paint spray increases in proportion to the pull-in distance, and when it protrudes, the amount of paint spray decreases, and when the tip of the paint passage 3 is closed, the spray stops. Has been.
[0022]
In the open / close needle 6, a solenoid 7 is remotely controlled by a control signal from a central control device (not shown), and a plunger 8 is moved in and out in response to the signal.
At this time, since the plunger 8 is integrally connected to the opening / closing needle 6 and there is no play between them, the opening / closing needle 6 operates according to the movement of the plunger, and there is no operation delay with respect to the command signal. .
[0023]
As a member 9 for sealing between the opening / closing needle 6 and the paint passage 3, as shown in FIG. 3, an outer peripheral edge 9a is closely attached to the base body 1c of the spray nozzle, and an inner peripheral edge 9b is an outer periphery of the opening / closing needle 6. Similarly, the surface sealing material 9 is densely attached to the surface, and the sealing surface 9c can move in a diaphragm shape as the opening / closing needle 6 moves.
[0024]
Since the diaphragm-like sealing material 9 is in contact with the solvent of the paint, it is strong enough to withstand the pressure of the paint, for example, about 0.01 to 0.1 MPa.
In FIG. 3, reference numeral 12 denotes a bracket for the solenoid 7, which is attached to a support member 11 fixed to the base body 1 d of the spray nozzle via an adjustment screw 13 whose axis is aligned in the same direction as the protruding and retracting direction of the solenoid 7. ing.
[0025]
A step motor (not shown) that rotates forward and backward in response to a signal from the control device is connected to one end of the adjusting screw 13 by a connecting member 13a, so that the target amount can be rotated forward and backward by remote control. .
[0026]
The atomizing air supply port 4 of the spray nozzle 1 is not shown, but is connected to a compressor that feeds a constant pressure of compressed air, and the paint supply port 5 is not shown. Although not shown, a pump for feeding the paint from the paint tank and a control device for adjusting the supply pressure of the pump are provided. It is controlled by a central control device that controls supply pressure and the like according to a program.
[0027]
In the coating apparatus having the above-described structure, in order to perform color adjustment of a large number of spray nozzles, first, an object to be coated is prepared, and the coating apparatus is actually driven according to an evaluation drawing program to coat the object to be coated.
[0028]
Here, the drawing program for evaluation refers to a program for causing the control device to draw a test pattern relating to color, brightness, and density.
Then, the target value of the evaluation drawing program is compared with the actual painting result to make an adjustment, and finally the adjustment is made so that the same painting result as the target painting is obtained by the evaluation drawing program.
[0029]
In this case, it is desirable to attach a white sheet or film on the surface of the object to be coated so that the color tone can be observed in more detail.
And the surface of a to-be-coated body is measured with a color difference meter etc. and evaluated.
[0030]
In the evaluation, as shown on the left side of FIG. 5, when the drawing density a1 of a specific spray nozzle 1X is significantly different from the set value and other spray nozzles, the step motor 13a connected to the corresponding spray nozzle is used. The adjustment adjustment screw 13 is rotated forward and backward to move the spray nozzle 1 up and down to adjust the stroke S of the open / close needle 6. As shown in the column after adjustment on the right side of FIG. lose.
[0031]
Next, the overall color tone is evaluated, and the actual drawing is light or dark as shown in the lower row as a whole with respect to the color and tone of the set values shown in the upper part of the left side of FIG. When the evaluation before adjustment such as “shown” is detected by the numerical value of the color difference ΔE shown in the figure, the paint supply pressure P itself for the spray nozzles 1 is adjusted instead of the adjustment of the individual spray nozzles 1 (in the example shown, the paint supply pressure is shown). The drawing is set as shown in the adjusted column on the right side of the figure.
[0032]
In this case, as shown in FIG. 7, the lengths of the acceleration voltage time L1 and the holding voltage time L2 that are applied at the initial operation of the solenoid of each spray nozzle 1 are within the ranges indicated by L10 and L20, respectively. The drawing density may be adjusted by increasing or decreasing the adjustment. In the case of the illustrated example, the time unit that can be adjusted, that is, the resolution is 0.1 milliseconds.
[0033]
Here, the acceleration voltage means a voltage higher than usual applied to the solenoid in order to quickly perform the initial opening / closing operation of the needle. The holding voltage refers to a voltage sufficiently large to hold the position of the solenoid once it has been operated, and may be much smaller than the acceleration voltage. In the case of the illustrated example, the acceleration voltage is 100V, while the holding voltage is 24V.
[0034]
Therefore, the drawing density of all the spray nozzles 1... 1 is adjusted all at once by these adjustments.
In this adjustment, when the density of a set value by a program becomes lighter in order of a1, a2, and a3 as shown in FIG. 8, for example, the actual drawing before adjustment is b1. , B2, b3 and b2 are darkened, as shown in the middle frame of FIG. 8, the setting part c2 of the corresponding program is indicated by an arrow among the setting values c1 to c3 of the program. Adjust and adjust the density. In this case, the nozzle itself is not mechanically adjusted.
[0035]
If the density difference is not sufficiently larger than the set value or vice versa, as shown in FIG. 9, the conversion of the output conversion table with respect to the command input of the solenoid control voltage for operating the open / close needle 6 of the spray nozzles 1. Adjustment is performed by making the slope of the coefficient f1 tight (solid line) or loose (dotted line).
[0036]
When such a problem occurs only in the intermediate portion, the intermediate portion of the line indicating the conversion coefficient may be curved as shown by a one-dot chain line in FIG.
The above operation is repeatedly adjusted while evaluating the color difference ΔE from the actual drawing.
[0037]
Then, when the above adjustments enable drawing as set, the adjustment is completed, and thereafter, the operation according to the program is actually performed to coat the outer wall material.
[0038]
In the above embodiment, the case where one kind of paint is sprayed from the coating apparatus has been described. However, the present invention is not limited to this, and two or more spray apparatuses are arranged along the same conveyor, and different paints are used. By spraying, the same adjustment can be made even in the case of a multicolor coating pattern.
[0039]
【The invention's effect】
Since the present invention is configured as described above, according to the first aspect of the present invention, when adjusting the drawing pattern on the surface of the outer wall material, each spray nozzle is not provided with a flow meter or a regulator. Since the volume can be reduced and the arrangement density of the spray nozzles can be reduced, drawing with a fine spray pattern is possible, and there is an advantage that precise drawing can be performed.
[0040]
Moreover, since the adjustment of the drawing pattern on the outer wall material surface is performed only by changing the numerical value of the painting data in the control device, the adjustment can be performed very easily and quickly.
According to the multi-nozzle toning method in the coating apparatus of claim 2, there is an effect that a multicolor pattern can be easily implemented.
[Brief description of the drawings]
FIG. 1 is a plan view of a coating apparatus used in the method of the present invention.
FIG. 2 is a front view of a coating apparatus used in the method of the present invention.
FIG. 3 is a cross-sectional view of a spray nozzle of a coating apparatus used in the method of the present invention.
FIG. 4 is an explanatory view illustrating a state of intermittent spraying of a spray nozzle used in the method of the present invention.
FIG. 5 is an explanatory diagram showing an adjustment method in the method of the present invention.
FIG. 6 is an explanatory view showing an adjustment method in the method of the present invention.
FIG. 7 is a graph showing a state of an operating voltage of a solenoid in the method of the present invention.
FIG. 8 is an explanatory diagram showing an adjustment method in the method of the present invention.
FIG. 9 is an explanatory view showing an adjustment method in the method of the present invention.
FIG. 10 is a graph showing a conversion table of solenoid control voltages in the method of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Spray nozzle 2 Air passage for atomization 3 Paint passage 4 Air supply port for atomization 5 Paint supply port 6 Opening / closing needle 7 Solenoid 8 Plunger 10 Outer wall material 11 Conveyor 20 Base frame

Claims (2)

The spray pattern sprayed on the surface of the outer wall material is arranged in a number of spray nozzles that are circular to oval in a direction perpendicular to the direction of the outer wall material transfer, and a lighter color with a shorter spraying time depending on the shade of the paint, longer spraying In the color matching method of a large number of nozzles in the coating apparatus for the outer wall material, in which a color pattern is attached while controlling the spraying time so that a spray pattern having a dark color to an elliptical shape is drawn with time ,
When toning a large number of spray nozzles, the coating device is actually driven on the prepared object according to the drawing program for evaluation, and a test pattern relating to color, brightness, and density is applied, and the surface of the object is measured with a color difference meter. To measure and evaluate at
Based on the evaluation related to the density, color adjustment of the drawing density for each spray nozzle arranged in a large number is performed by adjusting the needle stroke of each spray nozzle and changing the drawing data,
Based on the evaluation relating to the color and tone, the color adjustment of the color and tone of the entire spray nozzle is performed by adjusting and decreasing the paint supply pressure supplied to the entire spray nozzle, and the needle opening and closing operation according to the program. When a color tone drawn by the method is partially changed, a color adjustment method for a plurality of nozzles in a coating apparatus, wherein the operating voltage of the needle is adjusted via a conversion table in which a ratio of output to input is variable. The method for colorizing a plurality of nozzles in a coating apparatus according to claim 1, wherein the coating apparatus includes a group of a plurality of spray nozzles arranged so as to be continuous in the orthogonal direction without substantially interrupting the spray pattern. There are two or more groups of spray nozzles according to the colors, and the number of nozzles in the coating apparatus is such that these two or more colors of paint can be mixed together after painting. Color method.

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