JP2002192031A - Method of coloring with many nozzles in coating apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To control rapidly the adjustment of the discharge quantity of a coating material and the change of the gradation of density in spite of decreasing the size of each spray nozzle as small as possible in the case of coating with many spray nozzles arrayed. SOLUTION: This coloring method with many nozzles in a coating apparatus for an external wall material is performed to apply color pattern by controlling the spraying time of the spray nozzles 1,...1 each having a circular or elliptic spray pattern 1a to draw the dot like spray pattern having a tint color with a short spray time and a dark color with a long spray time corresponding to the density of the coating, where the color adjustment of each spray nozzle in the arrayed many nozzles is performed by the control of a stroke S of a needle 6 of each spray nozzle and the change of drawing data, the color adjustment of the whole spray nozzles 1 is performed by the increase and the decrease of the supply pressure of the coating material to be supplied to the whole spray nozzles 1 and the opening and closing operation of the needle according to the program, and the partial change of the color drawn by the method is controlled through a conversion table capable of changing the ratio of the output to the input of the operation voltage of the needle.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for toning multiple nozzles in a coating apparatus.

[0002]

2. Description of the Related Art A fiber-reinforced cement board, which is widely used as an outer wall material, has a surface color of gray-white if left as it is.
Since it is gray-black and poor in design, decoration with various colors is performed to also impart surface waterproofness.

As means for automatically coating the surface of the outer wall material, a large number of spray nozzles are arranged in a direction orthogonal to the direction of transport of the outer wall material, and together with the transfer of the plate material, based on a control signal from the spray nozzle. When paint is intermittently sprayed to form a circular or elliptical colored coating on the surface of the outer wall material, and these circular or elliptical spray patterns are used to provide a highly decorative decoration with integrated colors and patterns. There is.

[0004]

In the case of performing coating in a circular or elliptical shape by using a large number of spray nozzles, it is very important to control the spray injection of the spray nozzles.

As a control method, for example, in order to adjust the discharge amount of the spray nozzles, conventionally, a flow meter is attached to a large number of spray nozzles (for example, Japanese Patent Application Laid-Open No. 10-66193). .

However, when a flow meter is attached to each spray nozzle, the volume of one spray nozzle increases, and when a large number of spray nozzles are arranged, not only does the overall volume increase, but also each spray nozzle has a larger volume. Requires a regulator in addition to a flow meter, which further increases the volume of the spray nozzles, making it difficult to reduce the interval between the ejection ports of each spray nozzle, making it difficult to draw fine spray patterns densely. There was a problem.

Further, the control of the paint supply is performed by adjusting the paint supply amount by the above-mentioned flow meter or by adjusting the paint supply pressure by the regulator, and the control is automatically performed by feeding back the pressure value and the flow value. Control is performed, but when painting in a circular to elliptical shape as described above, the total number of nozzles often exceeds several hundred, and the control circuit is provided for each of such a large number of nozzles. However, there is a problem that it takes considerable time and takes much time to complete the adjustment.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has been made to solve the above problems and to quickly control the discharge amount of paint and the change in gradation of light and shade, despite the large number of spray nozzles. is there.

[0009]

In order to solve the above-mentioned problem, a method of toning a multi-nozzle in a coating apparatus according to the first aspect of the present invention provides a method for toning a multi-nozzle, which comprises:
A large number of spray nozzles having a circular to elliptical shape are arranged in a direction perpendicular to the direction of transport of the outer wall material. A method of toning a number of nozzles in a coating apparatus for an outer wall material in which a color pattern is applied while controlling these injection times so that a spray pattern is drawn, wherein each of a number of spray nozzles arranged in a row is provided. The color adjustment is performed by adjusting the stroke of the needle of each spray nozzle and changing the drawing data. The color adjustment of the entire spray nozzle is performed by adjusting the paint supply pressure supplied to the entire spray nozzle, and by opening and closing the needle according to the program. In the case where the color tone drawn by the above method is partially changed, the operating voltage of the needle is changed to a conversion ratio in which the ratio of the output to the input is variable. And adjusts via a cable.

[0010] Therefore, according to the method of the present invention, the discharge amount of the spray nozzles arranged in a large number can be controlled by the opening / closing stroke of the needle without using a flow meter or a regulator.
Since the adjustment is made by changing the drawing data, the adjustment is simple and quick, and the apparatus can be downsized. Further, the obtained decorative pattern is equivalent to or more than the conventional decorative pattern.

According to a second aspect of the present invention, there is provided a method for toning a multi-nozzle in a coating apparatus according to the first aspect. As a group of a large number of spray nozzles arranged so as to be continuous, two or more groups of such spray nozzles are provided according to the color, and after paint of these two or more colors is applied,
The one that can be mixed as needed is used.

Therefore, a multicolor shading pattern can be easily implemented.

[0013]

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 a main part of a spray nozzle.

In FIG. 1 and FIG. 2, reference numerals 1 ... 1 denote spray nozzles arranged in a large number, and 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. ing.

The base frame 20 is placed on the conveyor 11
A beam member 20a arranged orthogonally and brackets 20b attached to the beam member 20a with fastening members 20c such as bolts.
0b (FIG. 2), and a number of spray nozzles 1... 1 are supported on the beam 20a via the brackets 20b.

The beam member 20a has an arch member 20d, and can be moved up and down by an electric jack (not shown) from a support base frame (not shown). In addition, two conveyors 11 are provided in parallel to speed up the coating process.
The spray nozzles 1 are respectively supported and arranged on the base frame 20.

In the drawing, reference numeral 14 denotes a cleaning brush for the spray nozzles 1..., Which is driven to rotate when necessary and reciprocated along one row of the spray nozzles 1. In FIG. 1, the spray pattern 1a of each spray nozzle 1 on the surface of the outer wall material 10 is such that the pattern drawn by the jet flow Z from the spray nozzle 1 has a circular or elliptical shape as shown in FIG. Is preferably 6 mm to 15 m
m, a circular or elliptical shape having a diameter D = 10 mm in the case of the illustrated example. When the outer wall material 10 is transferred, the spray pattern 1a is intermittently sprayed to be lined up in the transfer direction (arrow). It is made to inject so that it may be connected.

Further, in order to draw the spray pattern 1a, the spray is intermittently jetted at intervals P, and is jetted intermittently over the length L of the 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 has an air passage 2 for atomization. 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.

A cover plate 1 is provided at the opening of the atomizing air passage 2 and the paint passage 3 of the base body 1d of the spray nozzle 1.
The spray port 1c of b is concentrically positioned and fixed.
An opening / closing needle 6 whose tip is conically pointed to the spray port 1c is disposed concentrically with the paint passage 3;
The opening / closing needle 6 is movable in the axial direction indicated by an arrow in a state where the tip 6a is inserted or faced into the spray port 1c.

The open / close needle 6 has a solenoid 7 at the rear end.
The movement of the plunger 8 operated by the solenoid 7 is directly transmitted to the opening / closing needle 6.

When the needle 6 is retracted, the amount of paint ejected increases in proportion to the retracted distance, and when ejected, the amount of paint ejected decreases conversely. When the tip of the paint passage 3 is closed, the ejected paint is ejected. It is made to stop.

The open / close needle 6 is remotely operated by a solenoid 7 according to a control signal from a central control unit (not shown).
The plunger 8 is moved in and out in response to the signal. At this time, the plunger 8 is integrally connected to the opening / closing needle 6, and there is no play therebetween, so that 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. .

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 1c of the spray nozzle.
The inner peripheral edge 9b is a planar sealing material 9 similarly densely attached to the outer peripheral surface of the opening / closing needle 6, so that the sealing surface 9c can move like a diaphragm in accordance with the movement of the opening / closing needle 6. .

Since the diaphragm-shaped sealing material 9 comes into contact with the solvent of the paint, the pressure for feeding the paint, for example, 0.01 to
The strength is set to withstand a pressure of about 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 1d of the spray nozzle via an adjustment screw 13 whose axis is aligned in the same direction as the direction in which the solenoid 7 protrudes and retracts. ing.

A stepping motor (not shown) is connected to one end of the adjusting screw 13 by a connecting member 13a, which rotates forward and backward by a signal from a control device, so that a desired amount of forward and reverse rotation can be performed by remote control. Have been.

Although not shown, the atomizing air supply port 4 of the spray nozzle 1 is connected to a compressor for supplying compressed air at a constant pressure. 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. The time and the paint supply pressure are controlled by a central control device which controls according to a program.

In the coating apparatus having the above structure, in order to perform toning of a large number of spray nozzles, first, an object to be coated is prepared.
The coating device is actually driven according to the drawing program for evaluation to paint the object to be coated.

Here, the drawing program for evaluation is
This is a program for causing the control device to draw test patterns related to color, brightness, and density. Then, the target value of the evaluation drawing program is compared with the actual painting result, and adjustment is performed, so that finally the same painting result as the target painting by the evaluation drawing program is obtained.

In this case, it is desirable to attach a white sheet or a film to the surface of the object to be coated so that the color tone can be observed in more detail. Then, the surface of the object to be coated is measured with a color difference meter or the like and evaluated.

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 spray nozzle 1X is connected to the corresponding spray nozzle. A drive command is issued to the stepping motor 13a, and the stroke of the opening / closing needle 6 is adjusted S by rotating the adjusting screw 13 forward and reverse to move the spray nozzle 1 up and down. As shown in the adjusted column on the right side of FIG. To eliminate the difference.

Next, the tone of the whole color is evaluated, and the actual drawing is generally lighter or darker as shown in the lower part of the drawing, as shown in the lower part of FIG. When the evaluation before adjustment such as darkness is detected by the numerical value of the color difference ΔE shown in the figure, the paint supply pressure P itself to the spray nozzle 1 is adjusted instead of adjusting the individual spray nozzles 1 (in the illustrated example, The paint supply pressure is reduced), and the drawing is performed as set as shown in the column after adjustment on the right side of FIG.

In this case, as shown in FIG. 7, L10 and L20 denote the lengths of the acceleration voltage time L1 and the hold voltage time L2 after the operation of each of the spray nozzles 1 at the initial stage of the solenoid operation, respectively. The drawing density may be adjusted by increasing or decreasing within the range. In the illustrated example, the time unit that can be adjusted, that is, the resolution is 0.1 milliseconds.

Here, the accelerating voltage is a voltage higher than usual applied to a solenoid to quickly perform the initial movement of the opening and closing operation of the needle. Further, the holding voltage refers to a voltage that is large enough to hold the position after the solenoid has been operated once, and can be considerably smaller than the acceleration voltage.
In the illustrated example, the holding voltage is 24 V while the acceleration voltage is 100 V.

Accordingly, the drawing density of all the spray nozzles 1... 1 is simultaneously adjusted by these adjustments. In this adjustment, the density of the set value by the program is set to a1, a2, a3 as shown in FIG.
In the case where the actual drawing before adjustment becomes dark in only the b1, b2, b3 and b2 portions, the program setting values are set as shown in the middle frame of FIG. Setting section c of the corresponding program among c1 to c3
2 is adjusted as indicated by the arrow, and the density is adjusted. In this case, no mechanical adjustment of the nozzle itself is performed.

If the density difference is not sufficiently higher than the set value or vice versa, as shown in FIG. 9, the output of the solenoid for operating the opening / closing needle 6 of the spray nozzles 1... Table conversion factor f1
Adjust by making the slope (solid line) or gently (dotted line) inclined.

When such an adverse effect occurs only in the intermediate portion, the intermediate portion of the line indicating the conversion coefficient may be curved as shown by the dashed line in FIG. The above operation is repeatedly adjusted while evaluating the color difference ΔE from the actual drawing.

When the above-mentioned adjustment enables drawing as set, the adjustment is completed. Thereafter, the operation according to the program is actually performed to paint the outer wall material.

In the above-described embodiment, the case where one type of paint is sprayed from the coating device has been described. However, the present invention is not limited to this, and two or more spray devices are arranged along the same conveyor, and are different from each other. The same adjustment can be made even when a multicolor paint pattern is formed by spraying the paint.

[0039]

According to the first aspect of the present invention, in adjusting the drawing pattern on the surface of the outer wall material, a flow meter or a regulator is provided for each spray nozzle. Since there is no spray nozzle, the volume of the spray nozzle can be reduced, and the arrangement density of the spray nozzles can be reduced.

Further, since the adjustment of the drawing pattern on the surface of the outer wall material is performed only by changing the numerical value of the coating data in the control device, the adjustment can be performed very easily and quickly. According to the toning method of the multi-nozzle in the coating apparatus of the second aspect, 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 sectional view of a spray nozzle of a coating apparatus used in the method of the present invention.

FIG. 4 is an explanatory diagram illustrating a state of intermittent injection 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 diagram 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 diagram showing an adjustment method in the method of the present invention.

FIG. 10 is a graph showing a conversion table of a control voltage of a solenoid 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 Exterior wall material 11 Conveyor 20 Base frame

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B05D 3/00 B05D 3/00 D 5/06 101 5/06 101Z // B05B 7/06 B05B 7/06 F term (reference) 4D075 AA04 AA39 AA83 AA84 AA87 CB11 DA06 DB12 DC02 4F033 AA01 CA01 CA02 EA05 GA02 GA10 QB02Y QB03X QB12Y QB18 QD04 QD21 QE16 QE22 4F035 AA03 BA02 BA05 CC02 A04A04 BA06

Claims (2)

[Claims] A spray pattern having a circular to elliptical spray pattern sprayed on the surface of an outer wall material is arranged in a plurality of directions in a direction orthogonal to the transport direction of the outer wall material, and a thin color is obtained in a short spray time according to the density of the coating. In order to draw a dark color circular to elliptical spray pattern with the longer spraying time, a method of toning many nozzles in a coating apparatus for an outer wall material in which a color pattern is applied while controlling these spraying times. There is a color adjustment for each spray nozzle
Adjusting the stroke of the needle of each spray nozzle and changing the drawing data, the color adjustment of the entire spray nozzle is
The operation of increasing or decreasing the supply pressure of the paint supplied to the entire spray nozzle, opening and closing the needle according to a program, and further, when partially changing the color tone drawn by the above method, the operating voltage of the needle is changed with respect to the input. A method for adjusting the number of nozzles in a coating apparatus in which the output ratio is adjusted via a variable conversion table. 2. A method for toning a multi-nozzle in a coating apparatus according to claim 1, wherein the coating apparatus includes a plurality of spray nozzles arranged in the orthogonal direction so that the spray pattern is substantially continuous. As a group,
A group of such spray nozzles is provided in two or more groups according to the colors, and after the paints of these two or more colors are painted, they can be mixed with each other. Toning method.