JP2538647Y2 - Paint color changer for painting machine - 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 color changing device for a paint machine, and more particularly, to easily and reliably change paint colors when painting with a plurality of colors using one paint machine. The present invention relates to a paint color changing device for a coating machine which can be used in a paint machine.

[0002]

2. Description of the Related Art As shown in FIG.
A plurality of paint supply pipes 111 for supplying paints of different colors, and a cleaning liquid supply pipe 131 for supplying a cleaning liquid.
And Each paint supply pipe 111 is connected to a pressure regulator 104 for adjusting the paint injection pressure via a guide pipe 141 and an intermediate opening / closing valve 112, respectively. It is connected to a pressure regulator 105 for adjusting the injection pressure of the cleaning liquid via a valve. Then, the user presses the pressure regulator 1 connected to the paint supply pipe of the color to be painted.
The end 144b of the hose 144a of the injector 144 is connected to the connecting portion 143 of the injector 144 each time to perform coating.

According to such a conventional apparatus, when a worker changes from one color paint to another color paint, the paint of the previous color remains in the injector 144 and its hose 144a. Therefore, it was necessary to first clean the inside of the injector 144 and the hose 144a. That is,
In the cleaning process, the intermediate opening / closing valve 112 of the guide pipe 141 connected to the paint supply pipe 111 before replacement is closed to remove the pressure in the hose 144a of the injector 144, and the end of the hose 144a of the injector 144 is removed. 144b to pressure regulator 1
Then, the end 144b of the hose 144a of the injector 144 is connected to the connection 105a of the pressure regulator 105 of the cleaning liquid supply pipe 131, and the intermediate opening / closing valve of the cleaning liquid supply pipe 131 is opened. Washing liquid with injector 1
44 and hose 144a. Thereafter, the end portion 144b of the hose 144a of the injector 144 was connected to the connection portion 143 of the pressure regulator 104 which was connected to the paint supply pipe 111 of the next color, thereby performing the painting operation.

[0004] However, such a conventional coating apparatus has a complicated structure, requires a large and large installation area, is expensive, and has a problem in terms of maintenance and management.

Further, according to the conventional apparatus, since the hose of the injector must be disconnected from the pressure regulator at the time of color changing work, the paint or washing liquid remaining in the hose flows out and the worker loses his / her paint. There was a problem of contaminating clothing and surrounding equipment.

[0006] Further, it is difficult to completely clean the paint remaining in the hose due to the weak flow force of the cleaning liquid.

Further, as a prior art, US Pat.
No. 684 (issued on Apr. 9, 1985) discloses a paint color changing device. This U.S. Patent discloses a manual spray gun which is applied to change the color of a paint for painting with an effective and rapid composite element spray fluid, wherein the device comprises a primary and secondary color changer. Means, each of which has a manifold with a through-hole passage, wherein the color elements to be used are injected with predetermined color equipment into the primary color exchange manifold, passing said manifold through a metering pump and a flow sensor. Into the secondary manifold, where it is sprayed by a spray gun through a paint discharge line of a predetermined color, which effectively flushes and converts color sequentially with fill and discharge valves and flushes. And through a dump valve to provide effective rapid cleaning of the line and continuous filling by a color discharge line.

[0008] However, the apparatus described in this US patent is designed to apply a predetermined amount of paint by mixing two or more kinds of paints. A primary color conversion means having a paint inlet, and a secondary color conversion means having one or more paint outlets for color outflow, and a meter for measuring and detecting the amount of paint flowing in between these means; Must have ring pump and sensor. In addition, during cleaning of these devices, not only must the pump valve be opened, but also the valve on each paint supply line must be closed, or a valve on a given paint supply line must be opened. There is no hassle.

Further, Japanese Utility Model Laid-Open Publication No. 63-77661 discloses a cleaning device for changing colors of a coating device. The apparatus described in this publication is a coating apparatus for supplying a plurality of paints to a spray gun via a color exchange valve. In order to wash the spray gun when changing colors, a paint solvent is supplied via a color exchange valve. A color exchange cleaning mechanism capable of alternately supplying air and air to the spray gun, the color exchange cleaning mechanism comprising a first electromagnetic valve interposed in a paint solvent supply passage connected to the color exchange valve, and a color exchange valve. And a control means for alternately supplying a pulse group signal composed of a plurality of pulses to the first and second electromagnetic valves.

However, according to the apparatus described in this publication, the first electromagnetic valve provided in the paint solvent supply path connected to the color exchange valve and the second electromagnetic valve provided in the air supply path connected to the color exchange valve. The configuration is complicated because it has electromagnetic valves and is controlled by a plurality of pulse group signals generated by these electromagnetic valves. Although a washing mechanism is provided at the upper part of the manifold to wash the paint, since a plurality of passages from the paint supply source of each color are arranged perpendicular to the passage of the manifold, the paint in that part is not washed. And also
It was difficult to perform complete cleaning by forming a cavity of the pressure of the cleaning mechanism.

[0011]

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a paint color changing device for a paint machine which can completely wash a paint of a color before the change when changing the color of the paint. .

Another object of the present invention is to provide a paint color changing device for a paint machine which can change the paint color with a simple structure.

[0013]

In order to achieve the above object, a color changing device for a paint of a coating machine according to the present invention is provided.
A paint supply unit having a plurality of paint supply tubes for supplying paint of a predetermined color, and a guide connected to the paint supply tube of the paint supply unit and forming a paint passage supplied from the paint supply tube. A cleaning liquid supply pipe connected to an inlet side of the guide section and supplying a cleaning liquid for cleaning a paint passage of the guide section and a compressed air supply pipe supplying compressed air. A paint sprayer connected to the outlet side of the guide section and having an injector for spraying paint; and a washing waste liquid connected to the outlet side of the guide section and cleaning the paint passage of the guide section. From the paint supply pipe, an opening / closing valve for supplying the washing liquid and compressed air from the washing liquid supply section to the guide section simultaneously or selectively, and An opening and closing valve for selectively supplying to the leading portion of the paint color, and having a closing valve for selectively supplying the said discharge portion cleaning waste from the induction unit.

The guide portion includes a hollow body and a guide member inserted and fixed to the body. The guide member extends in a longitudinal direction of the body, defines a central passage, and has an inner diameter of the body. A guide tube having an outer diameter smaller than that of the body and defining a space between the guide tube and the inner surface of the body, and a cleaning liquid and compressed air supplied from the cleaning liquid supply unit are supplied to a side wall surface of the guide tube. It is preferable that a plurality of injection holes for jetting from the central passage into the space are formed. Thus, the paint remaining in the central passage and the space as the paint passage of the guide tube can be completely washed.

Further, it is preferable that a plurality of spiral guide grooves are formed on the outer peripheral surface of the guide tube. As a result, the cleaning liquid pressurized by the compressed air swirls in the space as the paint passage of the guide tube, so that the paint cleaning effect is enhanced.

Further, a plurality of outer cylinder pipe mounting holes are formed in a side wall surface of the guide pipe, and the outer cylinder pipe mounting hole has a central axis coinciding with the central axis of the paint supply pipe and has a distal end. It is preferable to attach an external tube projecting into the end of the paint supply tube. Thus, the paint remaining in the end of the paint supply pipe can be completely washed.

Further, the discharge unit includes a discharge pipe having a plurality of discharge holes, a discharge guide unit provided apart from the discharge holes for weakening and dispersing the pressure of the washing waste liquid discharged from the discharge holes, and It is preferable to include a squirt part.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a paint color changing apparatus for a coating machine according to the present invention will be described in detail with reference to the drawings.

FIG. 1 is a schematic front view of a paint color changing device of a coating machine according to the present invention. In FIG. 1, reference numeral 1 denotes a paint supply unit, reference numeral 2 denotes a guide unit, reference numeral 3 denotes a cleaning liquid supply unit, reference numeral 4 denotes a paint spray unit, and reference numeral 5 denotes a discharge unit. It is.

As shown in FIG. 1, the paint supply unit 1 includes a plurality of paint supply pipes 11 and each paint supply pipe 11
Is connected to a paint storage tank (not shown) to supply paint of a predetermined color. Near the end of each paint supply pipe 11, a backflow prevention valve 13 and an opening / closing valve 12 are installed. As shown in FIG. 1, the plurality of paint supply pipes 11 are arranged in multiple stages facing each other, and
Is connected to the predetermined site.

The cleaning liquid supply section 3 includes a cleaning liquid supply pipe 31, and the cleaning liquid supply pipe 31 is a cleaning liquid storage tank (not shown).
To supply a washing liquid. Near the end of the cleaning liquid supply pipe 31, a backflow prevention valve 13 and an opening / closing valve 12 are installed. The cleaning liquid supply unit 3 is provided with a compressed air supply pipe 32.
The compressed air supply pipe 32 is connected to a compressed air tank (not shown) to supply compressed air. Near the end of the compressed air supply pipe 32, a backflow prevention valve 13 and an opening / closing valve 12 are installed. An end of the cleaning liquid supply pipe 31 and an end of the compressed air supply pipe 32 are connected to the guide section 2 via first and second ends of a T-shaped upper connection pipe 33, respectively.

The guiding portion 2 includes a guiding member 22 having a hollow inside, and the guiding member 22 is connected to the third end of the T-shaped upper connecting pipe 33 via the opening / closing valve 12. In addition, guidance unit 2
Is connected to the first end of the T-shaped lower connecting pipe 41.

The second end of the T-shaped lower connecting pipe 41 is connected to a discharge section 5 for discharging the washing waste liquid via a discharge pipe 51 having an open / close valve 12. Also, T-shaped lower connecting pipe 4
One third end is connected to the paint jetting section 4. The paint injection unit 4 includes a guide pipe 41a, a pressure adjuster 42,
It includes a connecting hose 44a and a paint injector 44.

Next, the guiding section 2 which is a main part of the present invention will be described in detail with reference to FIGS. 2, 3 and 4. FIG.

The guiding section 2 includes a hollow cylindrical body 21. A plurality of holes for receiving a plurality of paint supply pipes 11 arranged in multiple stages of the paint supply unit 1 are formed on the side wall surface of the body 21. The arrangement of these holes is
Various changes can be made depending on the arrangement of the paint supply pipes 11.

The body 21 of the guiding portion 2 has a hollow guiding member 2
2 is inserted and fixed. A flange portion 22a is formed at an upper portion of the guide member 22, and an insertion portion 22b having the same outer diameter as the inner diameter of the body 21 and being closely inserted into the body 21 is formed at a lower portion of the flange portion 22a for a predetermined distance. You. Further, a guide tube 22c for washing liquid or the like is integrally formed below the insertion portion 22b, and the guide tube 22c extends to near the bottom of the body 21. The outer diameter of the guide tube 22c is slightly smaller than the inner diameter of the body 21, and a space is formed between them. The inner diameter of the guide tube 22c is the same as that of the insertion portion 22b and the flange portion 2.
It is formed the same as the inner diameter of 2a.

A plurality of outer tube mounting holes are formed in the side wall surface of the guide tube 22c.
The outer tube 22d is fixed in a direction orthogonal to the longitudinal direction of 2c. The center axis of the outer tube 22 d is arranged so as to coincide with the center axis of the paint supply tube 11, and the tip of the outer tube 22 d projects into the end of the paint supply tube 11. In addition, a plurality of injection holes 22e having a predetermined diameter capable of injecting the cleaning liquid to the inner surface of the body 21 are formed in the side wall surface and the bottom surface of the guide tube 22c. Further, a plurality of spiral guide grooves 22f are formed on the outer peripheral surface of the guide tube 22c, and the cleaning liquid or paint whirls while the body 21
So that it is discharged to the outside.

As shown in FIG. 5, a plurality of discharge holes 51a for discharging the washing waste liquid are formed at the lower end of the discharge pipe 51 provided with the open / close valve 12. A discharge guiding section 52 is provided at a position away from the discharge hole 51a by a predetermined distance, and guides the discharge of the washing waste liquid from the discharge hole 51a downward. Also,
On the lower surface of the discharge pipe 51, an inverted dish-shaped squirt part 51b is formed, which spreads outward integrally with the discharge pipe 51, and diffuses the jetted washing waste liquid. That is, the cleaning waste liquid which is pressurized by the compressed air and vigorously squirts from the discharge hole 51a of the discharge pipe 51 is primarily a cap-shaped discharge guiding portion 52.
The pressure is reduced by colliding with the jetting portion 51b, and the pressure is secondarily reduced by colliding with the effusion portion 51b.

In the thus configured paint color changing apparatus of the present invention, in order to supply paint of a certain color, the opening / closing valve 12 of one predetermined paint supply pipe 11 is opened (at this time, All the open / close valves of the paint supply pipes other than the predetermined one paint supply pipe are closed), and the paint flows from the predetermined paint supply pipe 11 through the outer pipe 22d of the guide section 2 into the central passage in the guide pipe 22c. At the same time, it flows into the space formed between the guide tube 22c and the body 21 through the hole of the body 21 of the guide portion 2. Therefore, the center passage of the guide member 22 and the space between the guide tube 22c and the body 21 define the paint passage of the guide portion 2. Further, the paint that has flowed into the paint passage of the guide portion 2 in this manner is supplied to the opening / closing valve 12 of the discharge portion 5.
Is closed, it is supplied to the pressure regulator 43 via the T-shaped lower connecting pipe 41 and the guide pipe 41a, and the painting operation is performed by the paint injector 44.

In the final stage of the painting operation using such a predetermined one color paint, the opening and closing valve 12 of the predetermined one paint supply pipe previously opened is closed, and the opening and closing valve upstream of the guide portion 2 is opened. When the valve 12 is opened and the open / close valve 12 of the compressed air supply pipe 32 is opened, high-pressure air flows to the injector 44 via the paint passage of the guide 2 and the pressure regulator 43. Accordingly, the painting operation can be completed by using the paint remaining in the guide portion 2, the guide tube 41a, the connection hose 44a, and the injector 44. In other words, by doing so, all the paint remaining in the paint passage, the guide pipe 41a, the connecting hose 44a, and the injector 44 of the guide portion 2 before changing the color of the paint can be used up.

When the opening / closing valve 12 of the cleaning liquid supply pipe 31 is opened when the one color coating operation is completed, the cleaning liquid supplied through the cleaning liquid supply pipe 31 as shown in FIG. Together with the compressed air supplied through the compressed air supply pipe 32 flows into the central passage in the guide pipe 22c of the guide member 22. The cleaning liquid and the compressed air flowing into the guide pipe 22c are supplied to the paint supply pipe 1 via the outer pipe 22d.
The sprayed liquid is sprayed into the end of the paint supply pipe 11, and the inside of the paint supply pipe 11 is washed, and the space between the body 21 and the guide pipe 22c is quickly washed through the injection hole 22e of the guide pipe 22c.

When the open / close valve 12 of the discharge pipe 51 of the discharge section 5 is opened, the washing waste liquid that has washed the paint passage of the guide section 2 is discharged through the discharge hole 51a of the discharge pipe 51 as shown in FIG. You. At this time, the discharged cleaning liquid is jetted vigorously because it is pressurized by the compressed air. However, the pressure is weakened by the discharge guide section 52 and further jetted by the jetting section 51b.

After the paint adhered in the paint passage of the guiding section 2 is completely washed in this way, when the opening / closing valve 12 of the discharging section 5 is closed and the discharge port of the injector 44 is opened, the connecting pipe 41a is connected. The paint adhering to the hose 44a and the injector 44 is completely washed by the washing liquid. Thereafter, the opening / closing valves 12 of the cleaning liquid supply pipe 31 and the compressed air supply pipe 32 of the cleaning liquid supply unit 3 are closed, and the cleaning step is completed.

Next, the opening / closing valve 12 of the new color paint supply pipe 11 is opened, and the painting operation is performed with the new color paint.

[0035]

According to the paint color changing device of the coating machine of the present invention configured as described above, the guide portion forming the paint passage has a double pipe structure of the hollow body and the guide tube defining the central passage. The cleaning liquid and the compressed air supplied from the cleaning liquid supply unit are ejected from the central passage into the space between the inner surface of the body and the outer surface of the guide tube through a plurality of injection holes formed in the side wall surface of the guide tube. Therefore, the paint remaining in the central passage and the space as the paint passage of the guide portion can be completely washed, and the color of the paint can be easily exchanged.

Further, since the paint remaining in the guide portion and the paint jetting portion before the washing can be used up,
Paint consumption can be reduced.

[Brief description of the drawings]

FIG. 1 is a schematic front view of a paint color changing device of a coating machine according to the present invention.

FIG. 2 is a perspective view of a guide member of the paint color changing device of the coating machine according to the present invention.

FIG. 3 is a sectional view showing an assembly structure of a guide part of the paint color changing device of the coating machine according to the present invention;

FIG. 4 is an enlarged sectional view of a main part showing a flow of a cleaning liquid in a guide portion of a paint color changing device of a coating machine according to the present invention.

FIG. 5 is an enlarged sectional view of a main part showing a flow of a cleaning liquid in a discharge part of a paint color changing device of a coating machine according to the present invention.

FIG. 6 is a front view of a coating machine having a conventional paint color changing device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 paint supply section 2 guide section 3 cleaning liquid supply section 4 paint injection section 5 discharge section 11 paint supply pipe 12 open / close valve 13 backflow prevention valve 31 cleaning liquid supply pipe 32 compressed air supply pipe 33 T-type upper connection pipe 22 guide member 22a Flange portion 22b Insertion portion 22c Guide tube 22d Outer tube tube 22e Injection hole 22f Guide groove 41 T-type lower connecting tube 51 Discharge tube

Claims (4)

(57) [Scope of request for utility model registration] An apparatus for exchanging paint colors in a painting machine, comprising: a paint supply section (1) having a plurality of paint supply pipes (11) for supplying paint of a predetermined color, respectively.
A guide unit (2) connected to the paint supply pipe (11) of the paint supply unit (1) to form a passage for paint supplied from the paint supply pipe (11); and the guide unit (2). A cleaning liquid supply pipe (31) for supplying a cleaning liquid for cleaning the paint passage of the guide section (2) and a compressed air supply pipe (32) for supplying compressed air. A washing liquid supply unit (3), a paint spray unit (4) connected to an outlet side of the guide unit (2), and having a sprayer (44) for spraying paint; and the guide unit (2). And a discharge unit (5) connected to an outlet side of the cleaning unit (2) for discharging a washing waste liquid that has washed the paint passage of the guide unit (2) to the outside; Opening and closing to selectively supply to the guiding part (2) A valve (12) for selectively supplying paint of a predetermined color from the paint supply pipe (11) to the guide section (2); and a washing waste liquid from the guide section (2). And an opening / closing valve (12) for selectively supplying the body to the discharge part (5). The guide part (2) is a hollow body (21) and a guide inserted and fixed to the body (21). A member (22), wherein the guide member (22) extends in a longitudinal direction of the body (21) to define a central passage and the body (21).
A guide tube (22c) having an outer diameter smaller than the inner diameter of the body and defining a space between the inner surface of the body and the side surface of the guide tube (22c). A plurality of injection holes (2) for jetting the washing liquid and compressed air supplied from the central passage from the central passage into the space.
A paint color changing device, wherein 2e) is formed. 2. The apparatus according to claim 1, wherein a plurality of spiral guide grooves (22f) are formed on an outer peripheral surface of the guide tube (22c). 3. A plurality of outer cylinder pipe mounting holes are further formed on a side wall surface of the guide pipe (22c), and the outer cylinder pipe mounting holes coincide with a central axis of the paint supply pipe (11). The paint supply pipe (1
Device according to claim 1 or 2, characterized in that a projecting outer tube (22d) is mounted in the end of (1). 4. The discharge unit (5) includes a plurality of discharge holes (5).
1a), the discharge pipe (51), and the discharge hole (51).
A discharge guiding part (52) and a squirting part (51b) provided apart from the discharge hole (51a) for weakening and dispersing the pressure of the washing waste liquid discharged from a). An apparatus according to any one of claims 1 to 3.