JPH063472U - Paint circulation equipment - Google Patents

Abstract

(57) [Summary] [Structure] Main tank 1, blending tank 2, paint is supplied from main tank 1 to coating machine 5 ... From branch pipe 6 to main tank 1
In the paint circulating device having the recovery pipeline 4 for recovery, the main tank 1 and the mixing tank 2 are connected in parallel to the circulation pipeline 3 in the preceding stage of the pump. [Effect] The paint in the compounding tank 2 can be introduced into the circulation pipe line 3 without using the conventionally used transfer pump, and the paint replenishing mechanism becomes very simple. Therefore, the operating energy and cost can be remarkably reduced because the paint can be replenished without using special pump power. It is particularly useful when multiple colors of paint are used in circulation at the same time.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a paint circulating device which is installed in a car or a part of a paint factory for parts thereof, and supplies paint from a tank to each paint machine in a paint booth and then collects the paint in the same tank.

[0002]

[Prior art]

 Generally, in an automobile painting booth, in order to stably supply the paint of each color to each painter in the booth, a pump circulating device constantly circulates the paint between the tank and each painter. Be prepared for.

[0003] This paint circulating device is usually used to prevent paint from settling in a branch pipe to a coating machine, in addition to a circulation pipe in which the paint is fed from a tank to each coating machine in the booth and then returned to the same tank again. Therefore, it is equipped with a so-called third line, which is another route for collecting paint from the branch pipe to the tank (Actual No. 57-82973, No. 60-140670, No. 60-140671). See Japanese Patent Application Laid-Open No. 2-149369 and Japanese Patent Application Laid-Open No. 2-180667).

In addition, the tank of the above-mentioned device is usually composed of two types, a main tank for circulating paint and a mixing tank for supplying paint (see Japanese Patent Laid-Open No. 3-169369).

FIG. 2 shows a general-purpose example of a tank system of a conventional paint circulating device, 1 is a main tank and 2 is a mixing tank. These tanks 1 and 2 are propeller agitation type tanks, and are usually arranged side by side outside the coating booth. Further, the main tank 1 is equipped with a liquid level gauge 12 for monitoring the liquid level of the paint.

By operating the circulation pump 13 together with these tanks 1 and 2, the paint is fed from the main tank 1 to each coating machine in the coating booth, and after making a circuit in the booth, it returns to the main tank 1 again. And a collection pipe 4 (third line) for connecting the branch pipe (not shown) branched from the circulation pipe 3 to each coating machine to collect the paint and collect it in the main tank 1. Further, it is provided with a replenishing pipeline 20 which is discharged from the bottom of the mixing tank 2 and introduced into the main tank 1 from above via a transfer pump 21.

When the amount of paint in the main tank 1 decreases and the remaining amount is below a certain liquid level while the apparatus is operating, the liquid level gauge 12 detects this and the transfer pump. 21 operates, whereby the pre-prepared paint in the preparation tank 2 is transferred to the main tank 1 through the pipe 20 to replenish the paint.

That is, the paint is transferred from the mixing tank 2 to the main tank 1 by operating a pump different from the circulation pump. Although not shown in FIG. 2, a control device for automatically performing the linking operation between the liquid level gauge 12 and the transfer pump 21 is also provided (see Japanese Patent Laid-Open No. 3-169369). The above-mentioned paint replenishment is performed under the control of the device.

Further, the valve 22 is provided in the replenishing pipe 20, the connection port of the valve 22 is switched, and the paint is directly supplied from the commercially available paint can 13 to the main tank 1, whereby the paint is supplied. In some cases. Of course, the transfer pump 21 and the like were also used to supply the paint from the paint can 13 to the mixing tank 2.

[0010]

[Problems to be solved by the device]

 However, in the above-mentioned paint circulating device, it is necessary to install the transfer pump 21 in a place different from the mixing tank 2 and to arrange the pipe line 20 passing therethrough. There is a disadvantage that a considerably large space is required to install the paint replenishing mechanism in the tank 1, and in addition to the energy for paint circulation such as the power consumption of the circulation pump 10, the operation of the transfer pump 21 is performed. There is also the drawback that energy for paint transfer for such purposes is required, and operating costs increase accordingly.

It is necessary to separately arrange such paint supply mechanisms as many as the number of paint colors used. Therefore, when the color of the paint used for the actual painting is a single color or a few colors, the above-mentioned drawbacks do not become a big problem, but dozens of colors like the recent automobile painting boots. Or, in a paint booth in which paint of about 100 colors is circulated at the same time, a very large area or space is required to install the paint replenishment mechanism, and the operating cost is unacceptably large due to the reduction of paint cost. Therefore, the above drawbacks were serious problems.

Further, even if the paint replenishing mechanism is improved, the quality of the paint circulating between the main tank and each coating machine in the coating booth may fluctuate or the quality of the paint may be changed. It is necessary to avoid situations that have an adverse effect.

The present invention has been made in consideration of this point and has been made to solve such a conventional problem. The purpose of the present invention is to replenish paint from a blending tank to a paint circulation system without using a transfer pump. And the paint replenishment mechanism is very simple, so that the installation space can be significantly reduced, and the paint replenishment operating energy and cost can be significantly reduced. The purpose is to provide a paint circulation device that can be used.

[0014]

[Means for Solving the Problems]

 In the past, it was generally believed that once the paint prepared in the preparation tank was put into the main tank and then supplied to the circulation line, it was necessary to maintain the paint quality. The present inventor questioned this point, and repeated this experiment, yielding unexpected results different from the empirical rule. That is, the present inventor has found that even if the paint prepared in the preparation tank is not supplied to the main tank but is directly supplied to the circulation pipeline, no inconvenience will occur in the final coating quality. It is The present invention has been completed based on these findings.

Therefore, the paint circulating device according to the present invention is a main tank for circulating the paint, a mixing tank for replenishing the paint, and a coating machine in which the paint is supplied from the main tank by the operation of the pump. In a paint circulation system comprising a circulation line that is fed to the main tank and returned to the main tank, and optionally a recovery line in which the paint is collected in the main tank from a branch pipe connected to a coating machine, The main tank and the mixing tank are connected in parallel to the circulation pipe in the front stage of the pump.

The main tank, the mixing tank, the circulation pump, the circulation pipeline (including the branch pipe connected to each coating machine), the recovery pipeline, and the like can be used by all those actually used in the past. it can.

In the device of the present invention, the main tank and the mixing tank are arranged in parallel in the feed line of the paint circulation line, particularly in the line before the pump (on the side where the paint flows into the pump). The main tank supplies the circulating paint and the mixing tank supplies the prepared paint to the circulation line.

Therefore, in the device of the present invention, normally, outside the coating booth, a replenishment pipeline that connects the mixing tank (ordinary tank bottom) with the pipeline before the pump in the circulation pipeline (feed pipeline). Is provided. This supply line may be connected with a cock or a flow meter, if necessary. The interposition of the cock makes it possible to temporarily suspend the supply of paint.

However, unlike the prior art, the paint circulating device of the present invention does not need to include the transfer pump conventionally used for supplying the paint from the compounding tank to the main tank.

[0020]

[Action]

 In the present invention, since the mixing tank is connected to the circulation pipe line (feeding pipe line) in the preceding stage of the pump as well as the main tank, the paint in the mixing tank can be transferred into the circulation pipe line without using the pump power. You can This transfer of paint is always stable unless a pipe connecting the mixing tank and the circulation pipe is closed by a cock or the like.

Therefore, the present invention does not require a transfer pump for replenishing the paint. Therefore, the space required for the entire replenishment facility is remarkably large even if the space required for the replenishment facility is very small and even if it is necessary to circulate several tens to about a hundred colors at the same time in actual painting. It occupies a small space and poses no problem in practice.

[0022]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, the paint circulating apparatus of the embodiment is installed in a painting booth of an automobile, and includes a main tank 1, a mixing tank 2, a circulation pump 10 and the like installed around the booth, and a booth. A circulation pipeline 3 and a recovery pipeline (third line) 4 are provided along the wall of the.

The juxtaposed main tank 1 and the juxtaposed tank 2 are both provided with a propeller stirrer 11, and the main tank 1 is further provided with a liquid level gauge 12.

The circulation pipe 3 exits from the bottom of the main tank 1, enters the coating booth through the circulation pump 10 and the filter 14, and is a branch pipe connected to the coating machine 5 at each coating site in the booth. 6 is provided in a branched manner, and goes around the side wall of the booth to go out of the booth, and then returns to the main tank 1 again.

Therefore, by the operation of the circulation pump 10, the paint is supplied from the main tank 1 through the filter 14 to each of the coating machines 5 ... It is then sent through the return line 19 and out of the booth and back into the main tank 1 to circulate in the circulation line 3. A regulator 16 is provided in each branch pipe 6 for adjusting the amount of paint discharged.

Further, the recovery pipe 4 communicates with each branch pipe 6 through the throttle valve 17, and with the help of the circulation pump 10, the paint is collected from each branch pipe 6 as shown by the arrow q and the main tank 1 It is supposed to be collected at.

In the apparatus of the embodiment, in order to maintain the pressure of the paint in the circulation pipe 3 at a certain value or more, the back pressure valve 15 is provided in the feed pipe 7 immediately before entering the coating booth. The return line 19 and the recovery line 4 at the exit from the booth are respectively interposed. Although not shown, other necessary elements are also incorporated in the feed pipe line 7, the return pipe line 19, the recovery pipe line 4, and the like.

In the present embodiment, of the circulation pipeline 3 (feed pipeline 7), which is before the circulation pump 10, the mixing tank 2 is connected to the main tank 1 by the supply pipeline 8. Connected in parallel.

Therefore, the prepared paint in the preparation tank 2 can be introduced into the circulation line 3 through the supply line 8. Further, the supply pipe 8 is provided with a cock 9 so that the pipe 8 can be opened and closed as required.

During operation, the operation of the circulation pump 10 causes the paint to flow between the main tank 1 and the coating machine 5 of the coating booth along the circulation line 3 as shown by an arrow p in FIG. The paint that circulates between the pipes and flows into the branch pipes 6 ... Is collected in the main tank 1 through the collection line 4 as indicated by an arrow q.

When the amount of paint in the main tank 1 decreases during operation, and the remaining amount is below a certain liquid level, the liquid level gauge 12 detects this, and based on this detection, Release KU 9. Then, as shown by the arrow r, the prepared paint in the preparation tank 2 is introduced directly into the circulation pipe 3 through the supply pipe 8, whereby the paint is supplied. Then, when the paint supply is completed, the cock 9 is closed.

Even if such paint replenishment was performed, the final coating quality did not deteriorate at all.

When the paint in the mixing tank 2 is insufficient, the hose 18 is used to replenish the paint from a commercially available paint can 13.

[0035]

[Effect of device]

 As described above, according to the present invention, the paint can be replenished from the blending tank to the circulation pipeline without using the conventionally used transfer pump or the like.

Moreover, in the present invention, since the transfer pump is not used, the paint replenishing mechanism becomes very simple, and therefore the installation space required for the mechanism can be significantly reduced. Therefore, even when several tens or more colors of paint are circulated at the same time, such as automobile painting, the space for the entire paint replenishment facility is extremely small and the conventional equipment space increases. Lost.

More significantly, according to the present invention, since the transfer pump is not used, the electric power can be saved accordingly, and thus the operating energy and cost required for paint replenishment can be remarkably reduced as compared with the conventional one. It is possible.

[Brief description of drawings]

FIG. 1 is a diagram showing a paint circulating apparatus according to an embodiment of the present invention.

FIG. 2 is a diagram showing the vicinity of a tank system of a conventional paint circulating device.

[Explanation of symbols]

 1 Main Tank 2 Mixing Tank 3 Circulation Pipeline 4 Collection Pipeline 5 Coating Machine 6 Branch Pipe 7 Feeding Pipeline 8 Supply Pipeline 9 Cock 10 Circulation Pump 13 Paint Can p, q, r, Flow of Paint

Claims (1)

[Scope of utility model registration request] 1. A main tank for circulating paint, a mixing tank for replenishing paint, and a pump for supplying paint from the main tank to a coating machine in a paint booth and then returning to the main tank again. In a paint circulation device comprising a circulation line and, optionally, a recovery line in which the paint is collected in the main tank from a branch pipe connected to a coating machine, the above-mentioned circulation line in front of the pump is used. A paint circulating device comprising a main tank and the mixing tank connected in parallel.