JPH0422457A - Paint supply apparatus - Google Patents

Abstract

PURPOSE:To shorten the color change time of paint by branching paint piping into two pipings on the way thereof by a three-way valve and allowing two paint pipings to again meet with each other, and connecting qualitative extruding thinner sources to the resprctive paint pipings. CONSTITUTION:A color change valve 4 is opened to supply A-color paint to piping 31. At this time, for example, a three-way valve 12 is opened to the direction passing through pipings 32, 33 and the A-color paint reaches a painting gun 1 through pipings 36, 37. During the period from the painting start time t0 of the A-color paint to a time t1, the A-color paint is supplied to pipings 31, 32, 33, 36, 37 but, at the time t1, the color change valve 4 is changed over, and extrusion air 10 and washing thinner 9 are alternately supplied to the paint piping 31 to wash the paint pipings 31, 32 and the washing thinner 9 is discharged from disposal piping 51. By this method, a work pitch is shortened or feed speed is increased and productivity is enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a paint supply device for supplying paint to a paint gun, and in particular, to shorten the time required to change paint colors.

(Prior Art) In the top coating process of automobiles, a paint supply device is provided with a color changing device in order to apply multiple colors of paint with one paint gun.

As shown in Fig. 4, the conventional paint supply device consists of a paint gun 1 fixed to an automatic paint machine inside the paint booth, and a paint supply source (paint tank and paint tank) installed on the paint floor outside the paint booth. The paint gun 1 and the paint supply source 2 are connected by paint pipes 3a and 3b. A color change valve (CCv) 4 as a color change device, a paint regulator 5 as a discharge amount control device, and an ON-OFF valve 6 for discharging and shutting off paint are attached to the pipes 3a and 3b.

The color change valve 4 is connected with paints A, B, . Extrusion air 10 is connected. Then, the switching valve in the color change valve 4 is selected by an air signal sent from the control section of the color change device (not shown), and the desired paint,
Thinner or air is supplied to the painting gun 1 side.

Further, control air 7 for controlling the paint regulator 5 is supplied to the paint regulator 5 attached to the piping 3b on the downstream side of the color change valve 4 via an electro-pneumatic converter (not shown), etc. air 7
The respective discharge amounts of paints A, B, . . . supplied to the coating gun 1 are determined by the following.

On the other hand, the 0N-OFF valve 6 performs 0N10FF operation in response to the control signal from the air #8, and controls the supply and stop of the paint supplied from the paint regulator 5 to the painting gun 1 side.

Color changing in the conventional paint supply device configured as described above is performed as follows. That is, as shown in Figure 5,
For example, when changing the color from color A to color B, first switch the color change valve 4 to select color A, open the 0N-OFF valve 6, and spray the color A with a predetermined amount from the paint gun 1. Paint. When this A color painting is completed, the color change valve 4 is then switched to the extrusion air 10, and air is supplied into the arrangement 'i5' 3b.
i5' 3 Discard the A color paint in b from the paint gun 1 into the paint booth. Next, the color change valve 4 is switched to the cleaning thinner 9, and this cleaning thinner 9 is supplied into the pipe 3b in the same way as the extrusion air 10, and the cleaning thinner 9 is supplied into the pipe 3b.
Clean the A color paint that has adhered inside and discard it from the paint gun 1. The cycle of supplying the extrusion air 10 and the cleaning thinner 9 is repeated several times.

When this cleaning is completed, the A color paint has been cleaned and the inside of the pipe 3b is filled with only air. Then, the B color paint to be applied next is supplied and the workpiece is waited for to arrive.

(Three problems to be solved by the invention) However, the conventional paint supply device does not perform air extrusion, thinner cleaning, air extrusion, or
Since the color change process involved supplying the next color, the color change time was long, which was a major bottleneck in improving production capacity by shortening the line takt of the production line.

In particular, if the piping from the color change valve to the paint gun is long, the cleaning time will be longer. Providing a color change valve is not desirable in terms of equipment maintenance.

In order to shorten the color change time, attempts have been made to install two sets of color change valves and use them alternately, but this method suffers from problems such as high installation costs and complicated equipment maintenance. It was unrealistic.

The present invention has been made in view of the problems of the prior art, and it is an object of the present invention to provide a paint supply device that has a simple configuration and short color change time.

(Means for Solving the Three Problems) In order to achieve the above object, the paint supply device of the present invention includes a color change valve consisting of a large number of valve members disposed in the middle of a paint pipe connecting a paint supply source and a painting gun. In a paint supply device configured to select paint to be DU or J from a paint gun using this color change valve, the paint pipe connecting the color change valve and the paint gun is branched into two parts by a two-way valve. At the same time, when these two paint pipes are merged again, a metered extrusion thinner source is connected to each of these paint pipes, and a paint different from the previous color is to be discharged from the paint gun,
While paint is being supplied to one paint pipe for painting, the supply of paint from the color change valve is stopped, and the extrusion thinner from the quantitative extrusion thinner source is used to paint the downstream side of the paint pipe. The present invention is characterized in that painting is performed while pushing out the color change valve, and at the same time, the paint remaining in the paint pipe between the color change valve and the three-way valve is cleaned, and the next color paint is supplied to the other paint pipe.

(Function) The paint supply device of the present invention configured as described above stops the supply of paint from the color change valve during painting, and instead supplies a fixed amount of extrusion thinner to extrude the paint after the three-way valve. Continue painting while extruding with thinner. At the same time as this painting, the paint pipe between the color change valve and the three-way valve is cleaned, and the next color paint is supplied to the other paint pipe.

As a result, compared to the conventional color changing method in which one pipe is cleaned with cleaning thinner and extrusion air and then the next color paint is supplied, the color change time can be extremely shortened, and the production of multi-color coatings is possible. It becomes possible to improve sexual performance.

(Example) Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIG. 1 is a piping system diagram showing one embodiment of the present invention,
An example of a paint supply system for which it is not preferable to use a gear pump, such as for metallic base paints. Figure 2 is a color change time chart for the same example, and Figure 3 is a piping diagram showing another example of the present invention. It is a system diagram and is an example of a paint supply system that can use a gear pump like solid paint.

First, as shown in FIG. 1, the paint supply device of this embodiment consists of a paint gun 1 fixed to an automatic paint machine inside a paint booth, and a paint supply source 2 installed outside the paint booth in a paint storage.
The coating gun 1 and the paint supply source 2 are connected by paint piping (including a paint hose as well as metal piping).

This piping is equipped with a color change valve (CCV) 4 that is a color change device, a paint regulator 5 that is a discharge amount control device, a paint flow meter 11, and an 0N-OFF valve 6 that discharges and shuts off paint. ing.

The color change valve 4 and the paint supply source 2 are connected by a paint pipe 30, and the paints A and 2, each having a different color, are connected to each other by a paint pipe 30.
B, . . . are connected to each switching valve (valve member) of the color change valve 4. The color change valve 4 also includes paint pipes 31, 32, 34 leading from the color change valve 4 to a switching valve 13.14, which will be described later.
A cleaning thinner 9 (piping 91) and extrusion air 10 for cleaning the inside are connected. Then, the switching valve in the color change valve 4 is selected by an air signal sent from the control section of the color change device (not shown), and the desired paint, thinner, or air is applied to the paint gun 1.
Supplied on the side.

A paint regulator 5 installed downstream of the color change valve 4 is supplied with control air 7 for controlling the paint regulator via an electro-pneumatic converter (not shown), and this control air 7 controls the paint gun l. Paint A supplied to.

The discharge amount of B, . . . is determined.

On the other hand, the ON-OFF valve 6 performs ON10FF operation in response to a control signal from the air source 8, and controls the supply and stop of the paint supplied from the paint regulator 5 to the painting gun 1 side.

The paint pipe 31 according to this embodiment is configured to be branched into two parts toward the downstream side by a three-way valve 12, and to be joined again at a switching valve 15.

Another switching valve 13 is provided in one of the branched paint pipes 32, and in addition to the paint, cleaning thinner 9 (piping 92) and extrusion air 10 for cleaning the inside of the paint pipe 33 are connected. ing.

The paint and the like supplied through the paint pipe 32 can be switched between the paint pipe 33 side and the waste 51 side. In addition, the other pipe 34 has a switching valve 14.
In addition to the paint, this switching valve 14 also contains cleaning thinner 9 (piping 93
) and extrusion air 10 are connected, and the paint etc. supplied from the paint pipe 34 are transferred to the paint pipe 35 side and the waste 5.
It is configured so that it can be switched between two sides.

Furthermore, these switching valves 13.14 are connected to the paint supplied from the color change valve 4 through the piping 32.34.
The cleaning thinner, the extrusion air, the cleaning thinner supplied through the pipes 92 and 93, and the extrusion air are selectively switched.

The paint pipes 33 and 35 are each connected to a switching valve 15, and to the switching valve 15, a cleaning thinner 9 (piping 94) for cleaning the inside of the pipe 36 and extrusion air 10 are connected. And paint piping 33.
The paint etc. supplied by 35 is transferred to the paint pipe 36 side and disposed of 5
It is configured so that it can be switched to the 3rd and 54th sides.

Furthermore, this switching valve 15 controls the paint, cleaning thinner, and extrusion air supplied by the paint pipes 33 and 35.
The cleaning thinner supplied through the pipe 94 and the extrusion air are selectively switched.

The paint pipe 36 is connected to a switching valve 16, and a cleaning thinner 9 (piping 95) for cleaning the inside of the pipe 37 and extrusion air 10 are connected to the switching valve 16. The paint and the like supplied through the paint pipe 36 can be switched between the paint pipe 37 side and the waste 55 side. Furthermore, this switching valve 16
selectively switches between the paint and cleaning thinner extrusion air supplied through the paint pipe 36 and the cleaning thinner and extrusion air supplied through the piping 95.

In addition to the cleaning thinner 9 described above, the paint supply device of this embodiment has a constant extrusion thinner source 17 H, and the piping 2
2 is connected to the cleaning thinner pipe 90 described above. A regulator 18 and a gear pump 19 are provided in the piping 22 of the thinner source 17 for quantitative extrusion, and a bypass piping is further connected by a three-way valve 20 .

Note that "F21" is a flow port: t, and r26J is a check valve.

A valve 23 provided in the cleaning thinner pipe 90
When closed, the regulator 18 and gear pump 19 discharge cleaning thinner at a fixed amount to the pipes 92 to 95.
It is now possible to supply On the other hand, when this valve 23 is opened, thinner pumped from the cleaning thinner 9 side at a predetermined pressure is supplied to the pipes 92 to 95.

Next, the operation of this embodiment will be explained with reference to the color change time chart shown in FIG. Note that this color change time chart shows the operation of the paint supply device of this embodiment when changing the color from color A to color B.

First, the color change valve 4 is opened and the paint of color A is supplied to the pipe 31. At this time, the three-way valve 12 opens, for example, in the direction passing through the pipes 32 and 33, and the A color paint is applied to the pipe 3.
6.37 to the paint gun 1.

According to the conventional paint supply device, the color change valve 4 is open while the workpiece is being painted, but in this embodiment, the supply of color A paint from the color change valve 4 is stopped in the middle of painting. , instead, paint piping 33, 36
．． The A color paint at 37 is extruded by a meter 17 for quantitative extrusion.

In other words, the time t when color A coating starts. From t to t, color A paint is supplied to the paint pipes 31, 32, 33, and 36.37, but at t, the color change valve 4 is switched and the extrusion air 10 and cleaning air are supplied to the paint pipe 31. Thinner 9 is alternately supplied to clean the interior of the paint pipes 31 and 32, and the cleaning thinner 9 and the like are discarded from the waste pipe 51. On the other hand, between t and t3, the valve 23 is closed, the switching valve 13 is switched to the thinner side for constant extrusion, and the gear pump 19 supplies the thinner 17 for constant extrusion to the paint pipe 33 via the pipe 92. . As a result, the A color paint supplied from the paint pipe 33 onward is boosted by the quantitative extrusion thinner, and since the discharge amount of this quantitative extrusion thinner is controlled by the gear pump ] 9, the A color paint is The amount of paint discharged from the coating gun 1 is maintained as it is, and coating can be continued.

If you finish painting A color at “tel”=t3, valve 2
3 to supply cleaning thinner 9 to the pipes 92, 94 and 95. That is, the paint pipe 33 is cleaned by supplying the cleaning thinner 9 through the pipe 92, and at the same time, the pipe 36 is cleaned by supplying the cleaning thinner through the pipe 94. The pipe 37 is cleaned by supplying cleaning thinner. When cleaning such paint pipes, cleaning thinner and extrusion air are supplied alternately, as in the conventional cleaning cycle. Note that, as shown in the color change time chart, the paint pipes 33 and 35 are generally the longest, so sufficient cleaning time is taken.

The next color is supplied in parallel with such cleaning of the paint piping. That is, since cleaning of the paint pipe 31 is performed between t1 and t2, when this cleaning is completed, the color change valve 4 is switched and the three-way valve 12 is switched to the paint pipe 3.
Switching to the 4th side, the next color B paint is supplied into the paint pipes 31, 34, and 35 (t2 to t4). On the other hand, since the cleaning of the paint pipes 36 and 37 ends at time t4, after this cleaning is completed, color B is supplied to the paint pipes 36 and 37 (14-ts).

As described above, according to the paint supply device of this embodiment, compared to the conventional color change method in which the next color paint is supplied after cleaning one pipe with cleaning thinner and extrusion air,
The supply of paint was stopped during painting, and instead a fixed amount of extrusion thinner was supplied, and the piping after the color change valve was branched into two to be used alternately for each color change. Since the cleaning is performed one after another, the color change time can be extremely shortened. Therefore, it is possible to improve the productivity of multicolor coating.

Note that the present invention is not limited to the embodiments described above, and can be modified in various ways. For example, in the above-mentioned embodiment, a paint supply device was explained in which it is not preferable to use a gear pump for pressure pumping, such as for metallic base paints, but even if a gear pump is used for solid paints or clear paints, the paint It can also be embodied by a paint supply device which can be applied to paints that do not require any support during cleaning.

That is, as shown in FIG.
These gear pumps 24 are used to control the paint discharge amount, which was performed by the paint regulator in the first embodiment.
．． This is performed by controlling the rotation speed of 25. Therefore, in the first embodiment, an 8-concave gear pump was used to supply the thinner for quantitative extrusion that boosts the paint during painting, but in this embodiment, the gear pump 24.25 is used to supply the thinner for quantitative extrusion. The gear pump for supplying a fixed amount of extrusion thinner to the piping 22 and the piping 90 is omitted. The effects of this configuration are also similar to the first one mentioned above.
This is similar to the example.

(Effects of the Invention) As described above, the paint supply device of the present invention has a simpler configuration than the conventional paint supply device, and can shorten the color change time.

Therefore, it becomes possible to shorten the workpiece pitch or increase the conveyance speed, thereby improving productivity.

[Brief explanation of the drawing]

Fig. 1 is a piping system diagram showing one embodiment of the present invention, Fig. 2 is a color change time chart of the same embodiment, Fig. 3 is a piping system diagram showing another embodiment of the present invention, and Fig. 4 is a piping system diagram showing an embodiment of the present invention. A piping system diagram showing a conventional paint supply device, and FIG. 5 is a conventional color change time chart. 1...Painting gun, 2...Paint supply source, 3.30~3
7...Paint piping, 4...Color change valve, 9...Cleaning air 13 to 6...Switching valve, 17...Thinner source for quantitative extrusion.

Claims (1)

[Scope of Claims] A color change valve consisting of a number of valve members is provided in the middle of a paint pipe connecting a paint supply source and a paint gun, and the color change valve is configured to select the paint to be discharged from the paint gun. In the paint supply device, the paint pipe connecting the color change valve and the paint gun is branched into two parts by a three-way valve, and these two paint pipes are joined together again, and thinner for quantitative extrusion is supplied to each of these paint pipes. When dispensing a different color from the previous one from the paint gun, connect the
While paint is being supplied to one paint pipe for painting, the supply of paint from the color change valve is stopped, and the extrusion thinner from the quantitative extrusion thinner source is used to paint the downstream side of the paint pipe. A paint supply device characterized in that the paint is painted while extruding the color change valve, and at the same time, the paint remaining in the paint pipe between the color change valve and the three-way valve is cleaned, and the next color paint is supplied to the other paint pipe. .