JP2888315B2 - Paint circulation device in painting booth - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paint circulating apparatus in a paint booth. More specifically, the present invention relates to a paint circulating device in a paint booth that circulates paint to a paint room.

[0002]

2. Description of the Related Art FIG. 3 is a cross-sectional view showing a schematic structure of a conventional painting booth, and FIG. 4 is a piping diagram of a paint circulation device applied to the painting booth.

In these figures, reference numeral 1 denotes a booth body. The booth body 1 is long (for example, 80 to 120
m), the coating zone of the main body 1 is provided with a coating chamber 2, an air supply chamber 3 (dynamic pressure chamber 4, static pressure chamber 5) and an exhaust processing chamber 8 in the vertical direction.

[0004] The coating room 2 is a room for coating a work (for example, an automobile body) W transferred in a work transfer region 49 extending in the left-right direction in FIG. The first and second side coating machines 41L and 41R, the upper coating machine 47, and the like are provided as coating means. The work transfer area 49 is provided on one side and the other side of the coating machine 41L, 4
In general, the 1R is provided at the center in the booth width direction due to the arrangement of the 1R. Each coating machine 41 in this coating room 2
The paint is circulated and supplied to L, 41R, and 47 by a paint circulation device 10A.

[0005] As shown in FIG.
The paint in a predetermined number of paint tanks 32 installed for each color in the paint mixing chamber 31 is applied to the coating chamber 2 (each of the coating machines 41L, 41R,
47) paint feed lines 11L and 11 for circulating supply
R and the paint return pipes 15L and 15R, each of the pipes 11L and 15L on one side, and a coating machine (for example, 41) in the coating chamber 2.
L, 47), the branch pipes 18L, the respective pipelines 11R, 15R on the other side, and a coating machine (for example, 41) in the coating room 2.
R) and a branch pipe 18R that connects the branch pipe 18R.

[0006] The paint mixing chamber 31 and the booth body 1 are
For safety measures, it is general that the distance is about 100 to 200 m. The paint feed pipes 11L and 11R and the paint return pipes 15L and 15R are respectively formed of a predetermined number of paint feed pipes and paint return pipes. For example, when each of the coating machines (41L, 41R, 47) is capable of switching and spraying 50 colors of paint, the paint feed pipe and the paint return pipe for the number of color switches (ie, 50 pipes) are provided. Required. Each of the coating booth-side portions 11a, 11a, of these one-side pipes (11L, 15L) and the other-side pipes (11R, 15R).
As shown in FIG. 3, 15a is generally attached to the outer wall of the coating room 2 via a bracket or the like.

[0007] The air supply chamber 3 of the painting booth is
, And includes a dynamic pressure chamber 4 and a static pressure chamber 5. In addition, between the dynamic pressure chamber 4 and the static pressure chamber 5, partition plates 6 each having a slit 6a (or a bag filter) are interposed in order to keep the wind speed constant. Also, between the static pressure chamber 5 and the coating chamber 2,
A filter mat 7 is interposed to remove dust and the like.

The air sent into the air supply chamber 3 and supplied into the coating chamber 2 is heated to a predetermined temperature (for example, 20 to 30 ° C.) by an air conditioner (not shown) in order to improve coating quality and protect the working environment. Generally, the temperature is adjusted. In FIG. 3, reference numeral 29 denotes a one-side conduit (1
This is a regulator box for connecting each coating booth-side portion 11a, 15a of each of the coating booths (41L, 47, 41R) of the other pipe line (11R, 15R) and the other side pipeline (11R, 15R). Thus, the work transfer area 49 in the coating room 2
Is supplied to the work W transported.

[0009]

In the above-described paint circulating apparatus 10A, the viscosity of the paint changes according to the temperature, and the flow rate increases and decreases.
41R, 47), an excessive supply or shortage of the paint may cause a coating failure.

Therefore, in order to prevent such inconvenience,
The temperature is controlled by using a heat exchanger or the like so that the paint temperature is constant, and each of the one-side pipes (11L, 15L) and the other-side each pipe (11R, Fifteen
The R) portion may be covered with a heat insulating material 39 such as glass wool to keep the temperature. However, the above-mentioned heat-retaining work is performed over a range of several tens of meters, which is troublesome and increases the cost. In addition, the amount of protrusion in the lateral direction of both pipes (11L and 15L, 11R and 15R) increases, and the entire painting booth becomes even larger.

Therefore, there has been a demand for the development of a paint temperature control technique that eliminates the above-mentioned disadvantages. In this development, other paint conditions (smooth air supply from the air supply chamber 3 to the paint chamber 2 and work W It is premised that the paint is prevented from being drooled, and that the paint can be uniformly sprayed from both sides to the work W using the one-side and other-side coating machines 41L and 41R.

SUMMARY OF THE INVENTION In view of the above circumstances, it is an object of the present invention to smoothly supply air to a coating chamber, prevent paint from dripping, and uniformly spray paint on both sides of a work by using one side and the other side painting means. It is an object of the present invention to provide a paint circulating apparatus in a paint booth that can maintain a constant temperature of paint circulated and supplied to a paint room while reducing the size and cost of the paint booth based on a promise.

[0013]

According to the present invention, there is provided a paint circulating apparatus in a paint booth according to the present invention, wherein a paint feed pipe for circulating and supplying paint to a paint chamber to which temperature-controlled air is supplied from an upper air supply chamber. And a paint circulating device in a paint booth having a paint return pipe, wherein each paint booth side portion of the paint feed pipe and the paint return pipe is accommodated in the air supply chamber so as to be displaced from the work transfer area in the paint chamber. Each of the paint booth side portions of the paint feed line and the paint return line is connected to one side coating means in the coating room via one side branch line, and each of the paint booth side portions is connected to the coating room. And the other side of the coating means is connected via a branch line on the other side,
The one-side branch pipe and the other-side branch pipe are configured to have a flow resistance in the pipe such that the paint of the same pressure and the same flow rate can be circulated and supplied to the one-side coating means and the other-side coating means. Features.

[0014]

According to the present invention, the paint is circulated and supplied to the one-side coating means in the coating chamber through the paint feed pipe, the one-side branch pipe, and the paint return pipe. The paint is circulated and supplied to the other coating means in the coating chamber through a paint feed pipe, a branch pipe on the other side, and a paint return pipe.

Here, the one-side branch pipe and the other-side branch pipe have a flow resistance in the pipe such that the paint at the same pressure and the same flow rate can be circulated and supplied to the one-side coating means and the other-side coating means. The work can be spray-coated evenly from both sides by using both coating means.

Further, since the temperature of the air supply chamber is controlled to be substantially the same as the temperature of the coating chamber, the paint is naturally controlled while being circulated through the coating booth side of each pipe. Therefore, there is no need to provide a special heat exchanger or the like for controlling paint temperature. In addition, it is not necessary to cover each pipe with a heat insulating material such as glass wool as in the related art, so that it is not necessary to perform time-consuming and costly heat insulation work.

Further, it is possible to circulate and supply the paint from one set of the paint feed line and the paint return line to the one side and the other side coating means in the coating chamber by utilizing the one side and the other side branch lines. It is possible to reduce the piping length by about half compared to the conventional paint circulation system which requires one set of paint feed line and paint return line for one side and the other side coating means. Is reduced. Further, since the coating booth-side portions of both pipelines are accommodated in the air supply chamber, they do not protrude from both side walls of the booth main body as in the related art.

As described above, it is possible to keep the temperature of the paint supplied to the paint chamber constant while reducing the size and cost of the paint booth.

Further, the paint booth side portions of the paint feed pipe and the paint return pipe are housed in the air supply chamber. However, since the housing position is shifted from the work transfer area in the paint chamber, the work transfer is performed. The flow of air supplied from the air supply chamber to a work (for example, an automobile body) conveyed in the area is not obstructed by the coating booth-side portion of each pipe. Also, even if paint leaks from the paint booth side of each pipeline,
No paint is applied to the work. As a result, it is possible to ensure a smooth air supply into the coating chamber and prevent the paint from dripping.

[0020]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a view for explaining a main part of an embodiment of the present invention, and FIG. 2 is a cross-sectional view of a coating booth to which the present paint circulating apparatus is applied.

The paint circulating device in the paint booth has a paint feed pipe 11 and a paint return pipe 15 for circulating and supplying paint from each paint tank of a paint mixing chamber (not shown) to the coating chamber 2 of the paint booth. The coating booth-side portions 11a and 15a of the pipes 11 and 15 are accommodated in the supply chamber 3 so as to be displaced from the work transfer area 49 in the coating chamber 2, and the coating booths of the pipes 11 and 15 are accommodated. Side parts 11a, 15
a and the one-side coating means (41L, 45L) in the coating chamber 2 are connected via one-side branch pipes (21L, 25L), and the respective coating booth side portions 11a, 15a and the inside of the coating chamber 2 are connected. And the other side coating means (41R, 45R) are connected via the other side branch pipes (21R, 25R), and the one side branch pipes (21L, 25L) and the other side branch pipe (21R) are connected.
R, 25R) and one side coating means (41L, 45L)
In addition, it has a flow resistance in the pipe such that the paint at the same pressure and the same flow rate can be circulated and supplied to the other coating means (41R, 45R).

The same reference numerals as in FIG. 3 (conventional example) denote the same parts, and a detailed description thereof will be omitted.

Specifically, the paint booth-side portions 11a and 15a of the paint feed line 11 and the paint return line 15 are mounted near the inner side wall 5R of the static pressure chamber 5 constituting the air supply chamber 3 in FIG. It is arranged via a member 19. Paint feed line 11
The paint return pipe line 15 is composed of a predetermined number of feed pipes 12 and return pipes 16 arranged in parallel. The static pressure chamber 5 of the air supply chamber 3 has a height that can be walked, and has an entrance 5
D is provided.

On the other hand, on both sides in the coating chamber 2, a predetermined number of one-side coating means (one-side coating machine 41L and hand-blown coating gun 45L) capable of spraying a coating on a workpiece (vehicle body) W and the other are provided. Side coating means (other side coating machine 41R
And a hand-blown coating gun 45R).

Here, the coating booth-side portions 11a, 15a of the paint feed line 11 and the paint return line 15 and the one-side coating means (41L, 45L) are connected via one side branch line. And the coating means (41
(L, 45L). The one-side branch line is formed by a one-way branch line 21L and a return branch line 25L. On the other hand, the feed branch pipe 21L and the return branch pipe 25L are respectively provided with a predetermined number of feed branch hoses 22L and return branch hoses 26L.
L. Each branch hose 22L, 26L
Has one end connected to the feed pipe 12 and the return pipe 16, respectively, and the other end connected to the one-side coating machine 41L and the coating gun 45L.

The coating booth-side portions 11a, 15a of the paint feed line 11 and the paint return line 15 are connected to the other side coating means (41R, 45R) via the other side branch line. , Coating means (41
(R, 45R). The other side branch line is formed by the other side branch line 21R and the return branch line 25R. On the other hand, a predetermined number of the feed branch hoses 22R and a predetermined number of the return branch hoses 26R are respectively provided for the feed branch pipe 21R and the return branch pipe 25R.
R. Each branch hose 22R, 26R
Has one end connected to the feed pipe 12 and the return pipe 16, respectively, and the other end connected to each other-side coating machine 41R and the coating gun 45R.

Each of the branch hoses 22L, 26L, 22
R and 26R are formed of flexible and stretchable blade hoses of the same diameter so that piping work can be easily performed.

Here, the paint feed pipe 11 and the paint return pipe 15 and one side coating means (41L, 4L) in the coating chamber 2 are provided.
5L) and the other side coating means (41R, 45R), as shown in FIG. 2, the other side coating means (41R, 45R) is one side coating means (41L, 4R).
5L) than the painting booth side portion 11 of both pipelines 11 and 15
a, 15a is short. Therefore, one side branch line (21L, 25L) and the other side branch line (21R,
25R) so that the length thereof is minimized.
When interposed between 1, 15 and one side coating means (41L, 45L) and the other side coating means (41R, 45R),
The one-side branch line (21L, 25L) is considerably longer than the other-side branch line (21R, 25R), and the flow resistance in the pipe increases.

Therefore, the other side branch pipe (21R, 2R)
As shown in FIG. 1, the branching hoses 22R and 26R of the branch hoses 5R) are connected to the coating booth-side portions 11a and 15a of the pipes 11 and 15 as shown in FIG.
25L), the branch hoses 22L and 26L are shifted by a predetermined distance from the connection points of the conduits 11 and 15 with the coating booth-side portions 11a and 15a.
L and 22R, and 26L and 22R) are formed to have the same length. Thereby, the one side branch pipe (21)
L, 25L) and the other branch line (21R, 25R)
Are the same. In FIG. 2, reference numeral 4D denotes an entrance of the dynamic pressure chamber 4.

Next, the operation will be described. The paint is supplied to the one-side painting machine 41L and the painting gun 45L in the painting chamber 2 by the paint feed line 11, the one-side branch line (21L, 25L).
And, it is circulated and supplied through the paint return line 15. Further, the paint is supplied to the other side coating machine 41R and the coating gun 45R to the paint feed line 11 and the other side branch line (21R, 25R).
R) and is circulated through the paint return line 15.

Here, the one-side branch pipe (21L, 25
L) and the other side branch pipes (21R, 25R) are provided so that the paint at the same pressure and the same flow rate can be circulated and supplied to the one side painting machine 41L and the painting gun 45L and the other side painting machine 41R and the painting gun 45R. Since both of the coating means (41L and 45L)
L, 41R and 45R), the work W can be spray-coated evenly from both sides. Further, since the temperature of the air supply chamber 3 is controlled to be substantially the same as the temperature of the coating chamber 2, the paint is naturally controlled while being circulated through the coating booth-side portions 11a and 15a of the pipes 11 and 15. . Therefore, there is no need to provide a special heat exchanger or the like for controlling paint temperature. In addition, it is not necessary to cover each pipe with a heat insulating material such as glass wool as in the related art, so that it is not necessary to perform time-consuming and costly heat insulation work.

The coating room 2 is also connected to the paint feed line 11 and the paint return line 15 by using one branch line (21L, 25L) and the other branch line (21R, 25R). One side and the other side coating means (41L and 45
L, 41R and 45R), and the pipe is about half as long as the conventional paint circulating apparatus which requires a paint feed line and a paint return line for each one-side and other-side coating means. Length and plumbing work is greatly reduced. The painting booth side portion 11 of both pipelines 11, 15 is also provided.
Since a and 15a are accommodated in the air supply chamber 3, they do not protrude from both side walls of the booth main body 1 as in the related art.

As described above, the temperature of the paint supplied to the coating chamber 2 can be kept constant while reducing the size and cost of the painting booth.

Each of the paint booth-side portions 11a and 15a of the paint feed pipe 11 and the paint return pipe 15 is housed in the air supply chamber 2. The housing position is the work transfer area 49 in the paint chamber 2. Therefore, the flow of the air supplied from the air supply chamber 3 to the workpiece W transported in the workpiece transport area 49 is obstructed by the coating booth-side portions 11a and 15a of the pipes 11 and 15. Absent.

Even if the paint leaks from the coating booth-side portions 11a and 15a of the conduits 11 and 15, the paint is not applied to the work W. Thereby, it is possible to ensure a smooth air supply into the coating chamber 2 and to prevent the paint from dripping.

The coating booth-side portions 11a and 15a of the conduits 11 and 15 are accommodated in a position deviated from the central position in the width direction of the coating booth, so that the air supply chamber 3 is not obstructed by the portions 11a and 15a. The work of laying the filter mat 7 and the like can be smoothly performed in the inside.

Since the paint feed pipe 11 and the paint return pipe 15 are provided in the air supply chamber 3 and are not exposed to the outside, they are not used as scaffolds as in the prior art, and are impossible. No load is applied.

Further, since the static pressure chamber 5 of the air supply chamber 3 has a walkable height, it is convenient for maintenance of the paint feed pipe 11 and the paint return pipe 15 and the like.

It is also possible to dispose each of the pipes 11 and 15 in the dynamic pressure chamber 4 of the air supply chamber 3 so as to be displaced from the work transfer path 49 in the coating chamber 2.

[0040]

According to the present invention, the paint booth side portions of the paint feed pipe and the paint return pipe are accommodated in the air supply chamber so as to be displaced from the work transfer area in the paint chamber. The coating booth side portion and one side coating means in the coating chamber are connected via one side branch pipe, and each coating booth side part and the other side coating means in the coating chamber are connected to the other side branch pipe. And has a flow resistance in the pipe such that the one side branching line and the other side branching line can circulate and supply the same pressure and the same flow rate paint to the one side coating means and the other side coating means. Because of the configuration of the form, smooth air supply into the coating room, prevention of paint dripping, and the use of one-side and other-side coating means ensure that the paint can be sprayed uniformly from both sides to the workpiece. Painting booth miniaturization and cost reduction The temperature of the paint to be circulated and supplied to the coating chamber while reducing can be maintained constant.

[Brief description of the drawings]

FIG. 1 is a diagram for explaining a main part of an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a painting booth to which the present paint circulation device is applied.

FIG. 3 is a cross-sectional view showing a schematic configuration of a conventional painting booth.

FIG. 4 is a piping diagram of a paint circulation device applied to a conventional painting booth.

[Explanation of symbols]

 Reference Signs List 2 paint room 3 air supply room 11 paint feed line 11a paint booth side portion of paint feed line 15 paint return line 15a paint booth side portion of paint return line 21L one-side branch pipe line 21R the other side branch pipe Road 25L One-side branch branch line 25R The other-side branch branch line 41L One side coating machine 41R The other side coating machine 45L One side coating gun 45R The other side coating gun 49 Work transfer area

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-6-39336 (JP, A) JP-A-60-14964 (JP, A) JP-A-2-90962 (JP, A) JP-A-5-90 247202 (JP, A) Fully open sho 60-140670 (JP, U) Fully open sho 61-111567 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) B05B 15/00-15 / 12 B05C 11/10 B05C 15/00

Claims (1)

(57) [Claims] 1. A paint circulation apparatus in a paint booth having a paint feed pipe and a paint return pipe for circulating and supplying paint to a paint chamber to which temperature-controlled air is supplied from an upper air supply chamber, The paint booth side portions of the paint feed pipe and the paint return pipe are accommodated in the air supply chamber so as to be displaced from the work transfer area in the paint chamber, and the paint booths of the paint feed pipe and the paint return pipe are accommodated. The side part and the one-side coating means in the coating chamber are connected via one-side branch pipe, and each of the coating booth side parts and the other-side coating means in the coating chamber are connected via the other branch pipe. Connected, the one-side branch pipe and the other-side branch pipe having a flow resistance in the pipe such that the same pressure and the same flow rate of paint can be circulated and supplied to the one-side coating means and the other-side coating means. Paint brush Paint circulation equipment in the market.