JP2558178B2 - Paint supply equipment - Google Patents

Description

TECHNICAL FIELD The present invention relates to a paint supply device for adjusting the color, viscosity and properties of a paint to be supplied to a coating gun, and particularly to a paint supply device immediately before supplying to the coating gun. The present invention relates to a paint supply device capable of adjusting color, viscosity and properties.

(Prior Art) A paint supply device that mixes a paint reducing liquid and a solvent for dilution (thinner) and supplies a paint whose viscosity is adjusted to a paint gun has been already widely used in a painting line such as an automobile body. .

Japanese Utility Model Publication No. 2-25495, "Paint Supply Device" discloses a method in which each coating gun is provided with a viscosity adjusting device to supply a paint having a different viscosity according to each coating gun.

Japanese Unexamined Patent Publication No. 63-12363 “Painting device” discloses a method in which a temperature sensor is provided in a coating booth to control the supply amount of a solvent.

With a general paint supply device that does not use a temperature sensor, the temperature in the paint booth is set to about 35 ° C in summer and 20 ° C in winter, for example.
It was necessary to manually set the compounding amount of the solvent so that the viscosity was set to about 0 ° C. and the temperature was adjusted to that temperature.

On the other hand, when the temperature sensor is provided to control the solvent supply amount as described in JP-A-63-12363,
Although the viscosity of paint mixed with a solvent can be adjusted to a predetermined value, the viscosity changes, so the amount of paint discharged from the coating gun is not constant, and the paint that adheres to the car body is uneven. was there.

Japanese Unexamined Patent Publication (Kokai) No. 2-56281 "Method for coating anti-chipping paint for automobiles" discloses a method in which two kinds of anti-chipping paints having greatly different brightness are mixed in proper amounts and then applied. In this method, only the lightness is adjusted and the color is not adjusted.

Regarding the adjustment of the color of the paint, it is common to store the paint adjusted to the desired color in the paint tank in advance and supply it to the coating gun with a pump when using it. However, when the color is adjusted to match the color of the object to be coated, it may be necessary to adjust the color immediately before the coating, and the conventional method cannot cope with such a situation. In addition, the number of paint colors is increasing due to the diversification of user tastes, and the production efficiency of paints is decreasing due to the small quantity and variety of products. Furthermore, in the painting equipment, tanks and piping are required for each type, and the equipment is becoming complicated.

(Problems to be Solved by the Invention) An object of the present invention is to provide a coating gun immediately before supply.
An object of the present invention is to provide a paint supply device capable of adjusting color, adjusting viscosity, and adjusting properties.

Another object of the present invention is to provide a paint supply device that enables fine color adjustment, viscosity adjustment, and property adjustment.

(Means for Solving Problems and Actions Thereof) The above-mentioned object of the present invention is to provide a mixing means for mixing the paint from the paint tank and the solvent from the solvent tank, and a coating gun installed in the coating booth. In a paint supply device comprising a plurality of paint tanks and a plurality of solvent tanks, a temperature sensor for detecting the temperature in the coating booth, a paint installed in the middle of the pipe from each paint tank to the mixing means The capacity is 0.5 to 3 times the capacity of the coating material, and the coating material cushion tank that is open to the atmosphere and the solvent discharging quantity that is installed in the middle of the pipe from each solvent tank to the mixing means. Cushion tank for solvent having a capacity of 0.5 to 3 times the capacity and open to the atmosphere, and for supplying paint or solvent from each cushion tank to the mixing means A self-priming gear pump or screw pump, and a discharge ratio of each pump, a predetermined mixing ratio and solvent mixing ratio, and a mixing ratio comprehensive adjusting means for controlling according to a signal from the temperature sensor are arranged. Is achieved by a paint supply system.

Based on such a configuration, according to the paint supply device of the present invention, it is possible to mix paints from a plurality of primary color tanks, for example, tanks containing paints of three primary colors and solvents from a plurality of solvent tanks just before coating. The color adjustment and the viscosity adjustment can be achieved at the same time. Therefore, it is not necessary to mix the paint in the tank with the desired color in advance, and the designated color to be applied to the object to be coated such as the car body sent on the line is adjusted on the spot. Then you can immediately spray with a painting gun.

In addition, since the paint to be sent to the coating gun enters the cushion tank open to the atmosphere and is depressurized to the atmospheric pressure while being pressure-fed, the paint does not blow out at the moment when the valve is opened unlike the conventional case. From the cushion tank,
Since it is sucked up by the self-priming pump, an arbitrary discharge amount can be stably obtained.

Further, since the cushion tank is used, the conventional closed surge tank is not required. It is known that self-priming gear pumps and screw pumps have small pulsation.

The sliding surface of these pumps with the paint is
For example, it is desirable to use a plastic material such as silicon or a fluorine resin so as not to damage a brightening agent such as aluminum, mica, and graphite.

Since the screw pump has a relatively small diameter, it is possible to further stabilize the fixed amount feeding by installing a plurality of screw pumps in parallel.

It is desirable that a structure in which a contact type or non-contact type level meter is attached and linked with a gear pump so that the paint is supplied to the cushion tank at a constant level at all times.

Furthermore, it is desirable to attach, for example, an impeller with a motor to each cushion tank as a stirring means for mixing the liquid in the tank.

Further, it is desirable to polish the inner surface of the cushion tank so that the paint does not adhere to it.

As the mixing ratio comprehensive adjusting means, a motor drive mechanism for controlling the ratio of the discharge amount of the paint and the discharge amount of the solvent by controlling the rotation speed of the pump is used, and a computer equipped with a dilution ratio calculation program or It is desirable to connect a controller etc.

Furthermore, it is desirable to have a paint tank with a tank for containing at least one additive.

Furthermore, a coating object information sensor is provided in the coating booth, and signals relating to the coating color and gloss of the coating material to be coated on the surface of the coating object and the roughness of the coating object are transmitted to the mixing ratio comprehensive control means. By doing so, it becomes possible to perform more precise control.

Other features and advantages of the present invention will be apparent from the following description with reference to the embodiments of the accompanying drawings.

(Embodiment) FIG. 1 shows a preferred embodiment of the paint supply device according to the present invention, in which the paint stock solution from the three paint tanks 11, 12, 13 is supplied from the two thinner tanks 14, 15. The solvent and the retarder from the retarder tank 16 are mixed and supplied to the coating gun 70. An additive tank 17 is installed side by side with the paint tank, and if necessary, the color change valve (CCV) 60, which is a mixing means, mixes the paint stock solution with additives such as clear, curing agent, catalyst and matting agent. It has become. Although FIG. 1 of the embodiment illustrates the case where there is one additive tank, a plurality of additive tanks may be arranged in parallel depending on the purpose.

Each tank needs a feed pump 21-27, but if each tank is left as a drum and configured with a drum pump unit that integrally incorporates a pump, a drum cover, an agitator, a back pressure regulator, etc., It is convenient to use as it is. The liquids from the tanks 11 to 17 are sent to the corresponding cushion tanks 41 to 47 via the pressure supply pipe lines 31 to 37, respectively.

Each cushion tank has a structure as shown in FIG. 2. For example, the first coating stock solution introduced from the pressure feeding pipe line 31 is contained in the cushion tank 41 and is rotated by the motor 37 by the stirring blade 38. Stirred to keep viscosity constant. An air vent pipe 39 is attached above the cushion tank to communicate with the atmosphere. Therefore, the paint that has been pumped is depressurized to atmospheric pressure. A level meter 40 is inserted in the cushion tank to keep the liquid level constant. The paint is sent out by a gear pump 51 attached to the bottom surface and sent to a color change valve (CCV) 60. Similarly, the second and third paint stock solutions, thinner,
The liquid delivered by the gear pumps 52-57 from the cushion tanks 42-47 containing the retarder and the additives is delivered to the color change valve 60. Gear pump for additives
57 is preferably a rotary pump, a tube pump, a diaphragm-type metering pump or the like having a high metering accuracy.

The mixing ratio of each coating stock solution, the mixing ratio of the solvent, the mixing ratio of the additive, etc. are set to predetermined values by controlling the discharge amount of each gear pump 51 to 57 by a signal from the mixing ratio comprehensive adjusting device 62. Adjusted.

The signal from the sensor 63 for detecting the temperature in the coating booth, and the signal from the coated object information sensor 64 are sent to the mixing ratio comprehensive adjusting device 62, and the booth temperature information by these signals and Using a program that determines the mixing ratio of each stock solution, the thinner dilution rate, the additive mixing rate, etc. from the coating material information, the coating stock solution mixing information, and the paint temperature / viscosity information that has been input in advance. , The required amount of each liquid is determined.

The rotation speed of each pump is determined so that predetermined values of the determined amount of stock solution, solvent, and additive are obtained, and the rotation speed of each pump is controlled by an electrical or electronic control method. Thus, control is performed so that the optimum mixing ratio and discharge amount can be obtained.

The paint mixed by the color change valve 60 is sent to a static mixer (static type in-tube mixer) 68 to be mixed. The paint mixed and diluted at a predetermined ratio is sent to the coating gun 70 and sprayed toward the object to be coated. Since the mixing ratio and discharge amount of each liquid are controlled to be optimal, unevenness does not occur on the object to be coated, and the coating quality is maintained.

Color change valve 60 has a static mixer
In order to clean the line leading to the painting gun 70 through 68,
If the cleaning thinner pipe 72 and the air pipe 73 are additionally provided, it is possible to remove the influence of the residual color when the color is changed.

The following are some examples of actual coating work performed using the coating material supply device according to the present invention.

(Experimental Example 1) An application of an intermediate paint having an arbitrary N value (brightness) was tested. The following table shows the lightness of the paint obtained by charging the paint raw material tanks 11 and 12 with primary colors (white and black) having extremely different lightness and adjusting the mixing ratio. However, the composition of each primary color was as follows.

White Black Titanium White 31.7 Carbon black 3.9 Extender pigment 3.7 Extender pigment 7.9 Resin 34.7 Resin 46.1 Solvent etc. 29.9 Solvent etc. 42.1 Total 100 parts Total 100 parts As a result of the above, it has been found that the apparatus of the present invention can be used for coating with various lightnesses.

(Experimental Example 2) An experiment was performed in which the thinner ratio was changed depending on the booth temperature. The results are shown in the table below. However, the brightness N = 6
And Thinner composition: A (tank 14) is 10% cellose, 20% butyro, BDG1
The composition of 0%, MSS 40%, S-150 20%, B (tank 15) 50% ethyl acetate, MSS 50%, and retarder was EDGAC 100%.

(BDG: Butyldiglycol EDGAC: Ethyldiglycol Acetate) From the above table, it was found that even if the booth temperature changes, it is possible to paint without problems by controlling the thinner ratio.

(Experimental Example 3) An experiment was performed in the case of mixing of three primary colors.

The following table shows the results of charging each primary color into tanks 11, 12, and 13 and changing the mixing ratio of red, blue, yellow, and primary colors. The temperature sensed by the temperature sensor was 20 ° C.

The L value, the a value, and the b value were measured by SM color computer SM-4 manufactured by Suga Test Instruments.

 The blending amount of each primary color is as follows.

Red Blue Rubicron Huastogen 400RG 12.5 Blue 6016 6.0 Resin 39.6 Resin 44.7 Solvent, etc. 47.9 Solvent, etc. 49.3 Total 100.0 Total 100.0 Yellow Paliotor Yellow L-0962HD 11.2 Resin 40.1 Solvent, etc. 48.7 Total 100.0 As a result, it has been found that a desired color can be obtained by arbitrarily changing the mixing ratio of red, blue and yellow.

In this way, instead of pigments, luster (aluminum paste,
It is also possible to use mica).

(Experimental Example 4) An experiment was carried out in the case where an additive containing a vehicle component was added to the intermediate coating material. Intermediate paint in tank 11, tank
17 was charged with clearing agent. The appearance of the coating film was evaluated when the mixing ratio of the intermediate coating material and the addition clear containing the vehicle component was changed.

The relation between the roughness of the base and the roughness of the coating film is as shown in the following table. The value is Ra (center line average roughness), the clear amount is the addition amount with respect to 100 parts of the intermediate coating, and the P / V ratio (ratio of pigment and resin) of each is 0% P / V = 1/1 20% P / V = 1 / 1.25.

The composition of the clear for addition: The resin used in the intermediate coating
70%, solvent and other 30%.

As shown in the table above, when the surface roughness of the base is poor, the pigment-rich finishes better, but when the surface roughness of the base is good, the resin-rich finishes better. Therefore, it has been found that the use of the present invention makes it possible to adjust the P / V ratio in accordance with the roughness of the base, so that a good finished appearance can always be maintained.

(Experimental example 5) An experiment was carried out in the case where a matting agent paste was mixed with the paint. The tank 11 was charged with paint, and the tank 17 was charged with matting paste. Matte paste formulation is resin 30
%, Matting agent (mizukasil NP-8) 10%, and solvent 60%. The 60 ° gloss value (gloss when the incident angle and the reflection angle are 60 °) when the ratio of the matting agent to the paint 100 was changed is as shown in the following table.

(Experimental Example 6) Although a catalyst is often used to increase the reactivity of the paint, the storage stability of the paint may be deteriorated due to the influence of the catalyst, which may cause a practical problem. The change with time when left at room temperature added to the paint sent from the tank 11 was tested. Viscosity KU using a stoma viscometer
When the values of (Krebs Unit) were measured, the results are shown in the table below. The catalyst is PTSA (paratoluene sulfonic acid)
1% was added to the resin solid content.

As shown in the above table, in a system in which a catalyst has been added to the coating material in advance, the reaction proceeds over time, so the initial quality cannot be maintained. However, according to the present invention, since the catalyst can be added immediately before coating, there is no change with time and deterioration of quality does not occur. Moreover, since many additives such as catalysts have a high acidity, there is a possibility that problems such as corrosion may occur in a normal gear pump. In addition, the additive amount of the additive is often extremely small. From the above, as the pump used in the additive line, it is preferable to use a rotary pump, a tube pump, a diaphragm-type metering pump or the like, which has excellent acid resistance, chemical resistance, and quantitativeness.

(Experimental Example 7) An experiment was carried out on the case of mixing the main component / curing agent of a two-component paint. The following table shows the results obtained by charging the base material into the paint tank and the curing agent into the additive tank and mixing.

In addition, the mixing ratio of the main agent / curing agent is 1/1 as a standard product.

From the above table, due to the deviation of the ratio of main agent / curing agent,
It can be seen that the base material / hardening agent ratio must always be maintained at the standard state because the quality of the coating film cannot be maintained.

According to the present invention, the quantitative property of the pump used in the additive line is superior to that of the conventional gear pump.
It was found that the accuracy of the mixing ratio of the curing agent can be improved.

(Effects of the Invention) As described in detail above, according to the apparatus of the present invention, it is possible to perform color adjustment, viscosity adjustment, and paint property adjustment immediately before supplying to a coating gun, and to obtain a more delicate color. It is also possible to adjust the viscosity, viscosity, and paint properties. Further, the apparatus according to the present invention can be applied to improve the accuracy of the mixing ratio of a two-liquid mixing type paint, and further, to the technical effects such as simplification of the coating equipment and improvement of the paint production efficiency. There are some very prominent.

[Brief description of drawings]

FIG. 1 is a schematic circuit diagram showing the entire paint supply device according to the present invention, and FIG. 2 is a schematic vertical sectional view showing a cushion tank. 11 to 13 …… Paint tank 14,15 …… Solvent tank 16 …… Retarder tank 17 …… Additive tank 21 to 27 …… Feed pump 31 to 37 …… Pressurized pipeline 41 to 47 …… Cushion tank 51 to 57 …… Gear pump 60 …… Color change valve 62 …… Mixing ratio comprehensive adjustment device 63 …… Temperature sensor 64 …… Coated object information sensor 68 …… Mixer 70 …… Painting gun

Claims (2)

(57) [Claims] 1. A paint supply device comprising a mixing means for mixing paint from a paint tank and a solvent from a solvent tank, and a paint gun installed in a paint booth, wherein a plurality of paint tanks and a plurality of paint tanks are provided. A solvent tank, a temperature sensor for detecting the temperature in the coating booth, and a capacity of 0.5 to 3 times the capacity of the discharge amount of the paint, which is installed in the middle of the pipe from the paint tanks to the mixing means. A cushion tank for paint that is open to the atmosphere, and a capacity of 0.5 to 3 times the capacity of the discharge amount of the solvent that is installed in the middle of the piping from each of the solvent tanks to the mixing means and that is open to the atmosphere And a self-priming gear pump or screw pump for supplying paint or solvent from each cushion tank to the mixing means, A paint supply device characterized in that a mixing ratio comprehensive adjusting means for controlling the discharge amount of each pump in accordance with a predetermined paint mixing ratio and a solvent mixing ratio and a signal from the temperature sensor is arranged. 2. An object-to-be-coated information sensor is provided in the coating booth, and a signal from the object-to-be-coated object information sensor is transmitted to the total mixing ratio adjusting means.
The described device.