JPH06277574A - Dilute paint supply device - Google Patents

Abstract

PURPOSE:To provide a dilute paint supply device enabling to always keep fin ished appearance of coating at a high level without requiring expensive equip ment. CONSTITUTION:The device is provided with four pieces of thinner tanks 4A-4D respectively housing thinners SA-SD having mutually different properties, pumps 6A-6D respectively making the respective thinners SA-SD in the thinner tanks 4A-4D feed to a circulating piping 3, electromagnetic valves 7A-7D, a thermometer 10 in a booth measuring the temp. in a coating booth B, a paint thermometer 11 and a paint viscometer 12 measuring the temp. and viscosity of the dilute paint 8 circulating in the circulating piping 3. A control panel 13 is provided which is electrically connected to the thermometer 10 in booth, paint thermometer 11 and paint viscometer 12 and decides a compounding ratio and a replenishing quantity of the thinners SA-SD from the measuring result obtained automatically from the respective instruments and allows the pumps 6A-6D and the electromagnetic valves 7A-7D to perform feeding work in accordance to the decided values.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a diluted paint supply device for supplying diluted paint to a paint booth in a painting process of an automobile, for example.

[0002]

2. Description of the Related Art Conventionally, as the above-mentioned diluted paint supply device, there has been, for example, one shown in FIG.

The diluted paint supply device 51 shown in the figure comprises a paint circulation tank 52 and a circulation pipe 53 connected to this paint circulation tank 52 and to a nozzle N1 in a coating booth B1 via a valve V1. , Paint circulation tank 52
The raw paint is appropriately replenished with the thinner, and the thinner is replenished according to the viscosity and temperature of the diluted paint P1 circulating in the circulation pipe 53.

When diluting with this thinner, FIG.
As also shown in FIG. 6, after the diluted paint P1 circulating in the circulation pipe 53 is extracted in block 61, the viscometer (Ford cup) is extracted in blocks 62 and 63.
# 4) The paint viscosity η'of 55 and the paint temperature T'of the rod thermometer 56 are measured.

Then, in block 64, the amount of thinner to be replenished is determined from the previously measured paint viscosity η'and the paint temperature T ', based on the already known temperature-viscosity curve.

At this time, if it is determined from the value of the paint temperature T'that the evaporation speed of the thinner needs to be changed, at block 65, the winter thinner, summer thinner and autumn-spring thinner at block 66 are selected. The selection of the three types of thinners is changed and adjusted independently of the temperature T1 'in the coating booth B1.

Then, in block 67, block 65
The paint circulating tank 52 was manually replenished with the amount of thinner selected in (4) by the amount determined in block 64.

A part of the diluted paint supply device 51 is disclosed in, for example, Japanese Patent Laid-Open No. 56-45779.

[0009]

However, in the prior art, by measuring the paint viscosity η'and the paint temperature T'of the diluted paint P1 extracted from the circulation pipe 53, the amount of thinner to be replenished can be expressed as a temperature-viscosity curve. Although it can be determined based on the above, the evaporation speed of the thinner should be adjusted by following the change in the temperature T1 'in the coating booth B1 (about 20 ° to 35 ° per year) that has the greatest effect on the finished appearance of the coating. Was difficult.

For example, in the case of metallic coating, when the temperature T1 'in the coating booth B1 is low, as shown in FIG.
As shown in (b), the aluminum powder 59 of the color base 58 covered by the clear layer 57 is scattered to cause unevenness, so that the color changes depending on the viewing angle.
When the temperature T1 'in 1 is high, as shown in FIG. 5 (c), the aluminum powder 59 of the color base 58 projects into the clear layer 57, resulting in defective gloss.

Therefore, the appearance of the finished coating is shown in FIG.
As shown in (a), in order to always maintain a high level, conventionally, expensive equipment for keeping the temperature in the coating booth B1 constant is required, and it is a conventional problem to solve this problem. Met.

[0012]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and it is possible to always maintain the finished appearance of a coating at a high level without requiring expensive equipment. The purpose is to provide a supply device.

[0013]

SUMMARY OF THE INVENTION The present invention is an apparatus which is provided with a circulation pipe to which fresh paint is appropriately replenished, and which supplies diluted paint to a coating booth through the circulation pipe. A plurality of thinner tanks respectively accommodating different thinners, a feeding means capable of feeding each thinner in the plurality of thinner tanks to the circulation pipe, and a booth thermometer for measuring the temperature in the coating booth. A paint thermometer for measuring the temperature of the diluted paint circulating in the circulation pipe, and a paint viscometer for measuring the viscosity of the diluted paint circulating in the circulation pipe, and the thermometer in the booth, the paint thermometer and the paint The thinner mixing ratio and thinner replenishing amount are determined from the measurement results that are electrically connected to the viscometer and are automatically obtained from each instrument, and the thinner tank feeding means is determined accordingly. And characterized in that a structure in which a control means for feeding operation, and a means for solving the conventional problems described above the construction of such a dilution paint supply device.

[0014]

In the diluted paint supply apparatus according to the present invention, when the measurement results of the temperature and viscosity of the diluted paint circulating in the circulation pipe are automatically sent from the paint thermometer and the paint viscometer to the control means, The replenishing amount of thinner is determined by this control means.

The measurement result of the temperature in the coating booth is
When sent from the thermometer in the booth to the control means, the blending ratio of the thinner is determined by the control means.

Then, subsequently, the control means actuates the feeding means of the thinner tanks corresponding to the above result, respectively, so that the selected thinner among the thinners having different properties is circulated by the determined amount. It will be automatically fed to the pipe.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

FIG. 1 and FIG. 2 show an embodiment of the diluted paint supply device according to the present invention.

As shown in FIG. 1, this diluted paint supply device 1 is connected to a paint circulation tank 2 containing a diluted paint P, a nozzle N in a paint booth B via a valve V, and a suction end 3a and a suction end 3a. A circulation pipe 3 having a discharge end 3b connected to the paint circulation tank 2 is provided, and the diluted paint P is circulated between the paint circulation tank 2 and the coating booth B by a pump 3c provided in the circulation pipe 3. Has become.

The diluted paint supply device 1 is also connected to the paint circulation tank 2 and four thinner tanks 4A, 4B, 4C and 4D containing thinners SA, SB, SC and SD having different properties. Tanks 4A, 4B,
Pumps 6A, 6B, 6C, 6D as a feeding means provided in the thinner pipes 5a, 5b, 5c, 5d of 4C, 4D
Equipped with these pumps 6A, 6B, 6C, 6D
Is also a solenoid valve 7A, 7B, 7 as a feeding means.
When the valves C and 7D are opened, the air pipes 8a, 8b, 8c,
Operated by compressed air sent through 8d, thinners SA, SB, SC, S are applied to the paint circulating tank 2 respectively.
D is to be sent. In this case, SA is ethyl acetate as a low boiling point solvent, SB is toluene as a low cost solvent which is a main component, SC is butanol as a conductivity-imparting agent, and SD is butyl carbinol as a high boiling point solvent.

Further, the diluted paint supply device 1 is installed in the coating booth B and has a booth thermometer 10 for measuring the temperature in the coating booth B, a paint thermometer 11 for measuring the temperature of the diluted paint P, and a dilution device. The paint viscometer 12 for measuring the viscosity of the paint P is provided, and the paint thermometer 11 and the paint viscometer 12 are
Both are provided in the paint circulation tank 2.

Furthermore, the diluted paint supply device 1 is
The booth thermometer 10, the paint thermometer 11, and the paint viscometer 12 are provided with a control panel (control means) 13 which is connected via wiring 10a, 11a and 12a.
In No. 3, the blending ratio of thinners SA, SB, SC, SD and the replenishment amounts of thinners SA, SB, SC, SD are determined from the measurement results automatically obtained from the respective instruments 10, 11, 12. The control panel 13 is provided with an electromagnetic valve 7A for operating the pumps 6A, 6B, 6C, 6D.
Also for 7B, 7C and 7D, the wirings 9a, 9b, 9c,
9d, which is connected via 9d, and which corresponds to the electromagnetic valve 7 depending on the mixture ratio and the replenishment amount determined by the measurement result.
Open A, 7B, 7C, 7D as needed to pump 6A, 6B,
6C and 6D are activated respectively, and thinner tank 4A,
Thinners SA, SB, which meet the requirements from 4B, 4C, 4D
The SC and SD are supplied to the paint circulation tank 2 in the required amounts.

In this case, the thinner tanks 4A, 4B, 4
Flowmeters 14A, 14B, 14C and 14D are provided in the thinner pipes 5a, 5b, 5c and 5d of C and 4D, respectively, and these flowmeters 14A, 14B, 14C and
14D to the control panel 13 wiring 15a, 15b, 15c, 1
The control panel 13 monitors the flow rates of the thinners SA, SB, SC, SD passing through the thinner pipes 5a, 5b, 5c, 5d by connecting them via 5d.

In this embodiment, the diluted paint supply device 1 includes a raw paint tank 16 containing raw paint Pf, and a tank lower limit detector 17 and a tank upper limit detector arranged in the paint circulation tank 2. Equipped with 18,
The raw paint tank 16 includes a paint pump 19 and a paint flow meter 2
1 is connected to the paint circulation tank 2 through a raw paint pipe 16a provided on the way. The paint pump 19 is, like the pumps 6A to 6D, the air pipe 20 when the electromagnetic valve 20 connected to the control panel 13 via the wiring 20b is opened.
The raw paint Pf is supplied to the paint circulating tank 2 by being actuated by the compressed air sent through a. On the other hand, the flow meter 21 is connected to the control panel 13 via the wiring 21a, and the control panel 13 Thus, the flow rate of the raw paint Pf passing through the raw paint pipe 16a is monitored.

In the diluted paint supply device 1, the tank lower limit detector 17 and the tank upper limit detector 18 are connected to the control panel 13 via the wirings 17a and 18a, whereby the diluted paint P in the paint circulation tank 2 is connected. When the amount exceeds or exceeds the limit, the electromagnetic valve 20 is appropriately opened and closed to operate / stop the paint pump 19, and the raw paint Pf is fed from the raw paint tank 16 to the paint circulation tank 2.
It is shut off.

In this embodiment, in the diluted paint supply device 1, when the tank lower limit detector 17 detects that the diluted paint P in the paint circulation tank 2 has decreased beyond the limit, the control panel 13 is operated. Directive P
At the same time when the feeding of f is started, the electromagnetic valves 7A, 7B, 7
C and 7D are opened appropriately to operate the pumps 6A, 6B, 6C and 6D, respectively, and the raw paint Pf and the thinner tanks 4A, 4B, 4C and 4D and the required amount of thinner SA, The delivery of SB, SC, SD is started.

In this diluted paint supply device 1, the diluted paint P
Is supplied to the nozzle N in the coating booth B to start coating, and when the diluted paint P in the paint circulation tank 2 is gradually reduced, as shown in FIG. When it is detected by the lower limit detector 17 that the diluted paint P in the paint circulation tank 2 has exceeded the lower limit, the temperature T ₀ of the diluted paint P is measured by the paint thermometer 11 in the block 32, and the block 33 is measured. At the booth thermometer 10, the temperature T ₁ in the coating booth B is measured, and based on the measurement result, the block 34
Then, the thinner SA, SB, SC, S by the control panel 13
The evaporation speed of D is adjusted, that is, the mixing ratio of the thinner SA, SB, SC, SD is adjusted, and the mixing ratio of the thinner SA, SB, SC, SD is determined.

Next, the control panel 13 controls the electromagnetic valve 7
A, 7B, 7C, 7D open and pumps 6A, 6B, 6
Activate C and 6D respectively, and in block 35,
The thinner tanks 4A, 4B, 4C and 4D are supplied with thinner SA, SB, SC and SD which meet the requirements at the required mixing ratio and are supplied to the paint circulating tank 2.

At this time, the control panel 13 causes the electromagnetic valve 2
0 opens to operate the paint pump 19, and in block 36, the raw paint Pf is also fed from the raw paint tank 16.
Raw paint Pf is simultaneously supplied to the paint circulation tank 2.

Next, in block 37, raw paint Pf
Of the diluted paint P obtained from the paint viscometer 12 in block 38 after being left to be diluted uniformly.
Based on the measurement result of ₀ , in the block 39, the control board 1
The amount of replenishment of thinner SA, SB, SC, SD by 3 is determined, and in block 40, thinner SA, SB, SC, SD is replenished to paint circulation tank 2 by the previously determined blending ratio, and blocks 38 to 38 The operation of 40 is repeated in block 41 every time a predetermined time has elapsed.

Hereinafter, each time the tank lower limit detector 17 detects a decrease in the diluted paint P in the paint circulation tank 2, the above operation is repeated.

Therefore, the thinner SA, SB, SC, SD is automatically fed to the paint circulating tank 2 in a determined amount according to the compounding ratio determined according to the change of the temperature T ₁ in the coating booth B. Therefore, the finished appearance of the coating will always be maintained at a high level.

Next, when the temperature T ₁ in the booth B and the temperature T ₀ of the diluted paint P each change in the range of 18 ° C. to 30 ° C., they are supplied to the paint circulation tank 2 by the diluted paint supply device 1. Table 1 shows the compounding ratio of thinner SA, SB, SC, SD. (Thinner SA, SB, SC, SD
(Each number is% by weight)

[Table 1]

From Table 1, as the temperature T ₁ in the booth B and the temperature T ₀ of the diluted coating material P increase, the compounding ratio of the thinner SD which is a high boiling point solvent increases, and the thinner SA which is a low boiling point solvent becomes thinner. It was shown that the compounding ratio decreased.

In the above-described embodiment, the thinner SA, SB, SC, SD are obtained from the measurement results automatically obtained from the booth thermometer 10, the paint thermometer 11 and the paint viscometer 12 in the control panel 13. The compounding ratio and the supplement amounts of thinners SA, SB, SC, SD are controlled so as to be sequentially determined, but the present invention is not limited to this, and the measurement results obtained from the respective instruments 10, 11, 12 Based on the average value of the data in the past few days
Mixing ratio of A, SB, SC, SD and thinner SA, S
It is also possible to control so as to determine the replenishment amounts of B, SC and SD.

The detailed construction of the diluting paint supply device according to the present invention is not limited to the above-mentioned embodiment.

[0037]

As described above, in the diluted coating material supply device according to the present invention, the selected thinner among the thinners having different properties is determined by the compounding ratio determined according to the temperature change in the coating booth. The specified amount is automatically fed to the paint circulation tank, so it is possible to maintain the finished appearance of the paint at a high standard without the need for expensive equipment. Is brought about.

[Brief description of drawings]

FIG. 1 is an overall explanatory view showing an embodiment of a diluted paint supply device according to the present invention.

FIG. 2 is a block diagram illustrating an operation of the diluted paint supply device of FIG.

FIG. 3 is an overall explanatory view showing a conventional paint supply device.

FIG. 4 is a block diagram illustrating a paint diluting operation when the paint supply device of FIG. 4 is used.

FIG. 5 (a) is a cross-sectional explanatory view showing a finished state of coating when the temperature in the coating booth is a normal temperature. (B) It is a cross-sectional explanatory view showing a finished state of coating when the temperature in the coating booth is low. (C) It is sectional explanatory drawing which shows the finish state of the coating when the temperature in a coating booth is high.

[Explanation of symbols]

 1 Diluting paint supply device 3 Circulation pipe 4A, 4B, 4C, 4D Thinner tank 6A, 6B, 6C, 6D Pump (feeding means) 7A, 7B, 7C, 7D Electromagnetic valve (feeding means) 10 Booth thermometer 11 Paint thermometer 12 Paint viscometer 13 Control panel (control means) B Paint booth P Diluted paint Pf Raw paint SA, SB, SC, SD Thinner

Claims (1)

[Claims] 1. An apparatus comprising a circulation pipe to which fresh paint is appropriately replenished, and a device for supplying diluted paint to a coating booth through the circulation pipe, wherein the plurality of thinners each have different properties. A thinner tank, a feeding means capable of feeding each thinner in each of the plurality of thinner tanks to the circulation pipe, a booth thermometer for measuring the temperature in the coating booth, and a circulation in the circulation pipe. A paint thermometer for measuring the temperature of the diluted paint and a paint viscometer for measuring the viscosity of the diluted paint circulating in the circulation pipe are provided, and electrically connected to the booth thermometer, the paint thermometer and the paint viscometer. In addition, control means is provided to determine the blending ratio of thinner and the amount of thinner replenishment from the measurement results automatically obtained from each instrument, and to operate the feeding means of the thinner tank in accordance with this. A diluted paint supply device characterized by the above.