JPH091000A - Paint supply method and supply device - Google Patents

Abstract

PURPOSE: To conduct good-quality coating by eliminating the trouble tending to cause at the time of providing a back-pressure valve to increase the pressure of paint flowing in a paint circulating pipe. CONSTITUTION: A paint 2 is circulated through a paint circulating pipe 4 and supplied to a coating machine 12 from the pipe 4 through a branch pipe 8. In this case, a paint booster pump 6 is provided to the branch pipe 8, and the paint 2 sent by the pump 6 under pressure is supplied to the coating machine 12 through the branch pipe 8. When the pressure of the paint 2 supplied by the pump 6 is increased above a set pressure, the paint 2 is returned to the circulating pipe 4 through a relief valve 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paint supply method and a supply device used for coating an object such as an automobile body.

[0002]

2. Description of the Related Art An automobile body is coated with a paint selected from a plurality of types of paints prepared depending on the difference in color, the presence or absence of aluminum flakes, and the inclusion of mica.

FIG. 2 shows a conventional paint supply device used for coating with a paint selected from such a plurality of kinds of paints. The paint supply device 51 is for each color or numerous paint circulation system divided in accordance with aluminum flake and mica each presence of containing such S _1, S _{2, ····,} and includes a S _n.

Then, each paint circulation system S ₁ , S ₂ , ...
- for each S _n, a paint tank 53 containing the coating material 52, a paint circulation pipe 54 for circulating the coating material 52, a paint circulation pump 55, together with and includes a back pressure valve 56, paint circulating pipe 54 Paint regulator 5 on the way
7 is connected to one end of the paint branch pipe 58, the other end of each paint branch pipe 58 is connected to the input side of the paint switching valve 59, and the paint hose 61 is connected to the output side of the paint switching valve 59. A coating machine 62 such as a spray (electrostatic) coating machine (air or airless) or a rotary (electrostatic) coating machine is connected via the.

Further, a coating controller 63 is provided which outputs a control signal corresponding to the coating material to be coated and switches the coating material switching valve 59 to supply a desired coating material to the coating machine 62. Coating machine 6
2 is supplied with air A so that atomizing air is ejected not only at the initial stage of coating but also throughout the coating, and electrostatic coating can be performed by connecting a high-voltage power supply 64. ing.

A large number of such coating machines 62 (only two sets are shown in FIG. 2) are provided.

When the desired paint is supplied to the coater 62 by the paint supply device 51 having such a structure, the paint circulation pump 55 is used in each paint circulation system S ₁ , S ₂ , ..., S _n. each paint circulation system _{S 1,} S 2 by actuating, ..., the circulating paint 52 through the paint circulation pipe 54 in the _{S n,} the back pressure valve 5
A required pressure is applied to the paint 52 in the paint circulation pipe 54 by means of 6.

In this state, the coating controller 63
When a coating signal of a desired paint (for example, paint flowing through the paint circulating system S ₁ ) is output by the paint circulating system S ₁
The paint switching valve 59 (S ₁ ) connected to the paint branch pipe 58 (S ₁ ) connected to the back pressure valve 56 is opened.
Desired paint 5 raised to the required pressure by (S ₁ ).
2 (S ₁ ) flows through the paint regulator 57 (S ₁ ), the paint branch pipe 58 (S ₁ ), the paint switching valve 59 (S ₁ ) and the paint hose 61, so that the paint flowing in the paint circulation system S ₁ 52 (S ₁ ) is supplied to the coating machine 62, and atomizing air is ejected from the coating machine 62 for a very short period of time in the electrostatic field formed by the high-voltage power supply 64, and then the coating material 52 (S ₁ ) is sprayed. Spew out.

Next, when the coating controller 63 outputs a coating signal with another desired paint (for example, paint flowing through the paint circulating system S ₂ ), the paint branch pipe 58 (S connected to the paint circulating system S _{1). 1} ) is connected to the paint switching valve 59 (S ₁ ), and the paint switching valve 59 (S ₂ ) connected to the paint branch pipe 58 (S ₂ ) connected to the paint circulating system S ₂ is opened to open The paint 52 (S ₂ ) increased to a required pressure by the pressure valve 56 (S ₂ ) is a paint regulator 57 (S ₂ ), a paint branch pipe 58 (S ₂ ), a paint switching valve 59 (S ₂ ) and a paint hose. The paint 5 flowing through the paint circulation system S ₂ by flowing through 61
2 (S ₂ ) is supplied to the coating machine 62, and atomizing air is ejected from the coating machine 62 for an extremely short period of time in the electrostatic field formed by the high-voltage power supply 64, and then the coating material 52 (S ₂ ).
Spews atomized.

In this way, the paint switching valve 59 is operated by the paint signal from the paint controller 63 for the desired paint, whereby the paint circulating system S ₁ ,
The paints selected from the paints flowing through S ₂ , ..., S _n are supplied to the plurality of coating machines 62.

[0011]

As described above, the paint switching valve 59 is operated by the paint signal of the desired paint from the paint controller 63, whereby the paint circulating systems S ₁ , S ₂ , ..., The paint selected from the paints flowing through S _n will be supplied to the plurality of coating machines 62. When the paint 52 pumped by the paint circulating pump 55 opens the paint switching valve 59. A back pressure valve 56 is provided so that it can flow into the paint branch pipe 58 corresponding to the paint circulation pipe 54.
It is necessary to ensure that the required pressure is generated in the paint 52 flowing through the inside of the paint. Therefore, by providing the back pressure valve 56 in each paint circulation system, the back pressure valve 56 having this orifice structure is made of aluminum. There is a problem that flakes, mica, etc. may be crushed or color separation may occur, which may deteriorate the coating quality. It is possible that the back pressure valve 56 is provided. There was a problem to solve the problem that has a certain property.

[0012]

SUMMARY OF THE INVENTION The present invention has been made in view of such conventional problems, and may be caused by providing a back pressure valve for increasing the pressure of the paint flowing in the paint circulation pipe. It is an object of the present invention to provide a paint supply method and a supply device capable of performing a high quality coating by solving a certain problem and preventing aluminum flakes or mica from being crushed or causing color separation. Has an aim.

[0013]

According to a first aspect of the present invention, there is provided a paint supply method in which a paint is circulated through a paint circulation pipe, and the paint is branched from the paint circulation pipe through a paint branch pipe. When supplying it to the coating machine,
It is characterized in that a paint pressure pump is provided in the paint branch pipe, and the paint pressure-fed by the paint pressure pump is supplied to the coating machine through the paint branch pipe.

In the embodiment of the coating material supply method according to the present invention, as described in claim 2, the coating material pumped by the coating material pump can be returned to the coating material circulation pipe through the relief valve. You can do it like this.

The paint supply apparatus according to the present invention has a paint tank, a paint circulation pipe, and a paint circulation pump as described in claim 3, and a paint for branching the paint flowing through the paint circulation pipe. It is characterized in that it is provided with a branch pipe, and the paint branch pipe is provided with a paint pump for pumping the paint that branches and flows to the coating machine.

Further, in an embodiment of the coating material supply device according to the present invention, as described in claim 4, the coating material for returning the coating material pumped by the coating material pump to the coating material branch pipe to the coating material circulation pipe. It is possible to provide a return pipe and a relief valve for setting the pressure of the paint returned to the paint circulation pipe in the paint return pipe.

[0017]

According to the paint supply method of the present invention, as described in claim 1, the paint is circulated through the paint circulation pipe, and the paint is branched from the paint circulation pipe through the paint branch pipe to the coating machine. When supplying the paint, a paint pump was installed in the paint branch pipe, and the paint pumped by the paint pump was supplied to the painting machine through the paint branch pipe. Since a back pressure valve for increasing the pressure to a required pressure is not necessary, a problem that may occur due to the provision of the back pressure valve is solved, and coating with higher quality can be performed.

And, as described in claim 2,
By making it possible to return the paint pumped by the paint pump to the paint circulation pipe through a relief valve,
Even if the paint pump is operating when the paint is not used, if the paint pressure rises above the set value, the paint will be returned to the paint circulation pipe through the relief valve, so the paint switching valve will be oversized. Therefore, there will be no trouble such as applying a large paint pressure or damaging the paint pressure pump.

Further, in the paint supply device according to the present invention,
As described in claim 3, a paint tank, a paint circulation pipe, and a paint circulation pump are provided, and a paint branch pipe for branching the paint flowing through the paint circulation pipe is provided. Since a paint pump for pumping paint to the coating machine is provided, the back pressure valve for increasing the pressure of the paint flowing in the paint circulation pipe to the required pressure is no longer required as in the past. The problem that may occur due to the provision of is eliminated, and it is possible to perform coating with even better quality.

And, as described in claim 4,
The paint branch pipe is provided with a paint return pipe for returning the paint pumped by the paint pump to the paint circulation pipe, and the paint return pipe is provided with a relief valve for setting the pressure of the paint returned to the paint circulation pipe. By doing so, even if the paint pressure pump is operating when the paint is not consumed, the paint will be returned to the paint circulation pipe through the relief valve when the paint pressure rises above the set value. There will be no trouble such as applying excessive paint pressure to the switching valve or damaging the paint pressure pump.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of a paint supply device used for carrying out the paint supply method according to the present invention. This paint supply device 1 contains each color or aluminum flake or mica. numerous paint circulation system divided in accordance with whether each such _{S 1, S 2, ····,} and includes a _{S n.}

Then, each paint circulation system S ₁ , S ₂ , ...
_.. Each of Sn, a paint tank 3 containing the paint 2, a paint circulation pipe 4 for circulating the paint 2, and a paint circulation pump 5 are provided, and the paint circulation pipe 4 is fed with the paint in the middle thereof. One end of the paint branch pipe 8 provided with the pump 6 is connected, and the other end of each paint branch pipe 8 is connected to the paint switching valve 9
Is connected to the input part 9a side of the paint switching valve 9 and is connected to the output part 9b side of the paint switching valve 9 via a paint hose 11 such as a spray (electrostatic) coater (air, airless) or a rotary (electrostatic) coater. A coating machine 12 is connected.

A paint return pipe 13 is provided between the paint branch pipe 8 and the paint circulation pipe 4 at a position downstream of the paint pressure pump 6 and the paint pressure exceeds a predetermined value. A relief valve 14 is provided which is set to open when raised.

Further, a coating controller 15 is provided for supplying a desired coating material to the coating machine 12 by outputting a control signal corresponding to the coating material used for coating and switching the coating material switching valve 9. At the same time, the air A is supplied to the coating machine 12 so that the atomizing air is jetted only at the initial stage of the coating or throughout the coating, and the high-voltage power supply 16 is connected to perform electrostatic coating. You can do it.

A large number of such coating machines 12 (only two sets are shown in FIG. 1) are provided.

When the desired paint is supplied to the coater 12 by the paint supply device 1 having such a structure, the paint circulation pump 5 is used in each paint circulation system S ₁ , S ₂ , ..., S _n. each paint circulation by actuating system _{S 1, S 2, ····,} circulating paint 2 through paint circulation pipe 4 in _{S n.}

In this state, the desired paint (for example,
When coating with the coating material 2 (S ₁ ) flowing through the coating material circulation system S ₁ is started, the coating material pressure pump 6 (S ₁ ) starts operating in response to a command from the coating controller 15 and the coating material 2 (S ₁ ).
When the pressure feed of (S ₁ ) is started and the portion of the paint switching valve 9 between the input portion 9a (S ₁ ) and the output portion 9b is switched to the open state, the paint is fed by the paint pressure feed pump 6 (S ₁ ). The paint 2 (S ₁ ) is supplied from the paint hose 11 to the coating machine 12.

The paint pressure pump 6 (S ₁ , S ₂ ,
···· S _n ) is continuously operating, the paint pressure in the paint branch pipe 8 (S ₁ , S ₂ , ····, S _n ) rises above a set value, resulting in relief. The circulation returned to each paint circulation pipe 4 via the valve 14 is continued,
By the command from the coating controller 15, the switching valve 9 between the input portion 9a (S ₁ ) and the output portion 9b is switched to open so that the coating material pressure in the coating material branch pipe 8 (S ₁ ) decreases. The paint 2 (S ₁ ) does not pass through the relief valve 14 (S ₁ ) so that the paint 2 (S ₁ )
₁ ) will be supplied to the coating machine 12.

Next, when the coating controller 15 outputs a coating signal with another desired paint (for example, paint flowing through the paint circulating system S ₂ ), the paint pressure pump 6 (S).
₂ ) starts operating to start pressure feeding of the paint 2 (S ₂ ), and at the same time, the input portion 9 a (S ₂ ) of the paint switching valve 9 is started.
And the output portion 9b are switched to open, so that the paint ₂ (S ₂ ) that is pressure-fed by the paint pressure-feeding pump 6 (S ₂ ).
₂ ) is supplied to the coating machine 12 from the coating hose 11.

At this time, the paint switching pump 9 (S ₁ ) and the output unit 9b of the paint switching valve 9 are closed so that the paint pump 6 (S ₁ ) is still operating. Sometimes the paint pressure in the paint branch pipe 8 (S ₁ ) rises, but when the paint pressure exceeds the set value, the relief valve 14 (S ₁ ) opens and the paint 2
(S ₁ ) will be returned to the paint circulation pipe 4 (S ₁ ).

As described above, since the paint pressure-feeding pump 6 is provided in the paint branch pipe 8, the desired paint 2 can be changed to the paint switching valve 9 without providing a back pressure valve in the paint circulation pipe 4 as in the conventional case. Can be supplied to the coating machine 12 via the paint circulation system S ₁ , S ₂ , ...
..., the operation of the coating pressure feed pump 6 is in a system that does not use the paint 2 of S _n may be previously stopped, but the paint pressure is greater than a predetermined value even continued to operate the coating pressure feed pump 6 When this happens, the paint returns to the paint circulation pipe 4 via the relief valve 14, so that an excessive paint pressure is applied to the paint switching valve 9 or the paint pump 6 is pressed.
There is no problem such as damage.

[0032]

According to the paint supply method of the present invention, as described in claim 1, the paint is circulated through the paint circulation pipe, and the paint is branched from the paint circulation pipe through the paint branch pipe to the coating machine. At the time of supply, a paint pump was installed in the paint branch pipe, and the paint pumped by the paint pump was supplied to the painting machine through the paint branch pipe. A back pressure valve for increasing the pressure to the required pressure is not required, and the problems that may occur due to the provision of the back pressure valve can be solved, and it is possible to perform even better quality painting. The extremely excellent effect of

Then, as described in claim 2,
By making it possible to return the paint pumped by the paint pump to the paint circulation pipe through a relief valve,
Even if the paint pressure pump is operating when the paint is not used, it is possible to return the paint to the paint circulation pipe through the relief valve when the paint pressure rises above the set value. It is possible to prevent the occurrence of problems such as an excessive application of paint pressure or damage to the paint pressure pump, which is remarkably excellent.

Further, in the paint supply device according to the present invention,
As described in claim 3, a paint tank, a paint circulation pipe, and a paint circulation pump are provided, and a paint branch pipe for branching the paint flowing through the paint circulation pipe is provided. Since a paint pump for pumping paint to the painting machine is provided, it is possible to eliminate the need for a back pressure valve for increasing the pressure of the paint flowing in the paint circulation pipe to the required pressure as in the past. As a result, it is possible to solve the problems that may occur due to the provision of the back pressure valve, and it is possible to achieve a remarkably excellent effect that it becomes possible to perform coating with even better quality.

And, as described in claim 4,
The paint branch pipe is provided with a paint return pipe for returning the paint pumped by the paint pump to the paint circulation pipe, and the paint return pipe is provided with a relief valve for setting the pressure of the paint returned to the paint circulation pipe. By doing so, even if the paint pressure pump is operating when the paint is not consumed, it is possible to return the paint to the paint circulation pipe through the relief valve when the paint pressure rises above the set value. It is possible to prevent the occurrence of troubles such as applying an excessive paint pressure to the paint switching valve and damaging the paint pump for pumping the paint.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing an example of a paint supply device used for carrying out a paint supply method according to the present invention.

FIG. 2 is an explanatory view showing a paint supply device according to a conventional example.

[Explanation of symbols]

1 Paint Supply Device 2 Paint 3 Paint Tank 4 Paint Circulation Pipe 5 Paint Circulation Pump 6 Paint Pressure Pump 8 Paint Branch Pipe 9 Paint Change Valve 11 Paint Hose 12 Coating Machine 13 Paint Return Pipe 14 Relief Valve 15 Coating Controller S ₁ , S ₂ , ..., _Sn Paint circulation system

Claims (4)

[Claims] 1. When a paint is circulated through a paint circulation pipe and the paint is branched from the paint circulation pipe through a paint branch pipe to be supplied to a coating machine, a paint pressure pump is provided in the paint branch pipe, and a paint pressure pump is used. A paint supply method characterized in that the paint that is pumped is supplied to a coating machine through a paint branch pipe. 2. The paint supply method according to claim 1, wherein the paint pressure-fed by the paint pressure-feeding pump can be returned to the paint circulation pipe through a relief valve. 3. A paint tank, a paint circulation pipe, and a paint circulation pump are provided, and a paint branch pipe for branching the paint flowing through the paint circulation pipe is provided. The paint branch pipe is pressure-fed to the coating machine. A paint supply device characterized by being provided with a pump for pumping paint. 4. The paint branch pipe is provided with a paint return pipe for returning the paint pumped by the paint pump to the paint circulation pipe, and the paint return pipe is provided with a relief valve for setting the pressure of the paint returned to the paint circulation pipe. The paint supply device according to claim 3, wherein the paint supply device is provided.