JP2007050337A - Multi-color coater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To immediately switch a size of a coating pattern with good responsiveness. <P>SOLUTION: In the multi-color coater (1), a color-changing unit (5) which keeps a required number of color-changing valves (CV...) arranged along a longitudinal direction of a coat flow passage (7) is built-in and the coating selected by the color-changing unit (5) is sprayed by an atomization mechanism (4). A throttle valve (DV) for varying a cross section area of the coat flow passage (7) to two stages is provided in the most downstream side of the coat flow passage (7) formed on the color-changing unit (5). <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a multicolor coating machine having a built-in color change unit that feeds an arbitrary paint selected from a plurality of paints to an atomization mechanism formed at the tip of a body.

A multi-color coating machine is equipped with a color changing unit that selectively supplies a paint of an arbitrary color from each color paint.
In the color change unit 32 incorporated in the conventional multicolor coating machine 31 shown in FIGS. 5 and 6, for example, the color change valves CV _{10 to} CV ₁₇ are arranged along the annular flow path 34 formed in the valve block 33. In addition, the cleaning fluid is supplied through the color change valve CV ₁₀ at the upstream end, and the color paints are supplied through the other color change valves CV _{11 to} CV ₁₇ .
The downstream end of the annular flow path 34 is connected to a feed nozzle 38 inserted through a tubular rotary shaft 37 of an air motor 36 that drives the rotary atomizing head 35 of the coating machine 31.
JP 07-213957 A

Each of the color change valves CV _{10 to} CV ₁₇ is formed of an air operated type needle valve. By pulling the needle 39 with an air cylinder, the valve opening 40 communicating with the annular flow path 34 is opened to supply each color paint. It is supposed to be.
When the color change coating from the previous color paint to the next color paint is performed, the cleaning liquid / cleaning air is alternately supplied from the cleaning valve disposed on the uppermost stream side of the annular flow path 34 and remains in the flow path 34. After the paint is wiped and washed, the next color paint is supplied.

  By the way, when painting a car body or other work, if there are wide and narrow parts, if the paint pattern, discharge amount and distance to the work are kept constant, overspray will increase in the narrow part. Therefore, when trying to paint continuously, the over-mist is reduced by narrowing down the paint pattern on the work surface at the narrow part of the paint width, the use efficiency of the paint is improved, and the energy required for exhaust treatment There is a merit that the waste of waste can be reduced.

There are methods for narrowing the coating pattern, such as bringing the coating machine closer to the workpiece or narrowing the distance with the shaping air while leaving the distance unchanged, but it is possible to discharge the paint so that an appropriate coating film is formed with the normal coating pattern. If the coating pattern is narrowed when the amount is set, the coating amount per unit area increases, so that not only the coating film becomes too thick, but also a coating defect called sagging occurs particularly on vertical surfaces.
Conversely, when the paint discharge rate is set so that an appropriate coating film is formed with the paint pattern narrowed down, increasing the paint pattern reduces the amount of application per unit area. Not only does the coating film become too thin, it also causes a coating failure called skein.

  For this reason, the paint pattern is switched by changing the flow rate of the pump that supplies the paint to the coating machine from the paint supply source. However, the paint pump is located away from the paint machine, and the motor that drives the pump. Even if the number of revolutions is changed, it takes time until the number of revolutions stabilizes, and there is a problem that the response is poor.

  Therefore, the present invention is technically capable of forming a uniform coating film without causing poor coating by changing the flow rate of the paint with good responsiveness when the paint pattern is changed. It is an issue.

  In order to solve this problem, the present invention has a built-in color change unit in which a required number of color change valves are arranged along the longitudinal direction of the paint flow path, and the paint selected by the color change unit is fogged. In a multi-color coating machine that sprays with a conversion mechanism, a remote control type throttle valve that changes the cross-sectional area of the paint channel is provided on the most downstream side of the paint channel formed in the color changing unit. It is said.

According to the present invention, if each color paint is supplied to each color change valve at a predetermined pressure, the desired paint is supplied to the atomizing mechanism by opening any color change valve, and a predetermined size is obtained. The paint pattern can be painted.
At this time, a throttle valve that changes the cross-sectional area of the paint flow path is provided on the most downstream side of the paint flow path formed in the color change unit. By operating the throttle valve, the flow rate of the paint supplied from the color change unit to the atomization mechanism is increased and decreased, and it can be applied with an appropriate discharge amount according to the coating pattern, and it is uniform without causing sagging or scaling. A coating film is obtained.
In addition, since the throttle valve is arranged in a color change unit built in the coating machine, when the throttle valve is operated, the flow rate of the paint supplied to the atomizing mechanism changes immediately, and the time lag is ignored. It can be shortened to the extent obtained.
As the throttle valve, an arbitrary one such as a two-position throttle valve that changes the flow passage cross-sectional area in only two steps, a multi-stage throttle valve that changes stepwise, a continuously variable throttle valve that changes steplessly, and the like can be adopted. .
The throttle valve is remotely operated, for example, by the air pressure of the operating air, and the opening degree can be arbitrarily adjusted by remote operation by adjusting the air pressure of the operating air in two stages, multi-stages, and continuously.

  In this example, in order to achieve the purpose of forming a uniform coating film without causing poor coating by changing the flow rate of the paint with good responsiveness when changing the coating pattern, A remote control type throttle valve for changing the cross-sectional area of the paint channel was provided on the most downstream side of the paint channel formed in the color change unit.

  FIG. 1 is a cross-sectional view showing an example of a multicolor coating machine according to the present invention, and FIG. 2 is a cross-sectional view showing an example of a throttle valve.

In the multicolor coating machine 1 shown in FIG. 1, a rotary atomizing head (atomizing mechanism) 4 attached to a tubular rotary shaft 3 a of an air motor 3 is disposed on the distal end side of a substantially cylindrical body 2.
The body 2 has a built-in color changing unit 5 that selectively supplies paint of any color from a plurality of colors of paint, and feeds the paint selected by the color changing unit 5 through the tubular rotary shaft 3a of the air motor 3. A rotary atomizing head 4 is supplied through a nozzle 6.
Further, although not shown in the drawings, a shaping air blowout port for blowing shaping air for expanding and contracting the coating pattern is provided at the tip of the body 2.

The color change unit 5 is formed by arranging a required number of color change valves CV... Along the longitudinal direction of the paint flow path 7, and the outlet 7 out of the paint flow path 7 is communicated with the feed nozzle 6.
A remote control type throttle valve DV for changing the cross-sectional area of the paint flow path 7 is provided on the most downstream side of the paint flow path 7 so as to be located downstream of the color change valves CV.
In this example, an air operated type two-position throttle valve DV that changes the cross-sectional area of the paint flow path 7 in two stages is used. When no operating air is supplied, as shown in FIG. When the valve body 9 attached to is retracted from the paint flow path 7 by the elastic force of the spring 10 and the cross-sectional area of the paint flow path 7 is 100% and high-pressure operating air is supplied, FIG. ), The valve body 9 attached to the piston 8 advances into the paint flow path 7 against the elastic force of the spring 10 so that the cross-sectional area of the paint flow path is reduced to 50%. .

The above is one configuration example of the present invention, and the operation thereof will be described next.
As shown in FIG. 3, when the wide portions W ₁ and W ₃ are coated on both sides of the narrow portion W ₂ , the wide portions W ₁ and W ₃ have a large coating. in the pattern P _1, it is desirable that the coating with a small coating pattern P ₂ for narrow portion W _2.

First, when painting the wide portion W ₁ is in a state of opening the throttle valve DV maintaining the cross-sectional area of the paint passage 7 to 100%, opening the any color change valve CV in accordance with the paint color, The paint of that color is supplied to the rotary atomizing head 4 through the paint flow path 7-the feed nozzle 6, atomized by the rotary atomizing head 4, and sprayed. In this case, without paint passage 7 is squeezed, because the cross-sectional area is 100%, can be painted with a large coating pattern P ₁ in response to the supply flow rate of the paint.

Then, the width when moving to the narrow section W _2, while painting supplies paint at the same time by increasing the supply pressure of the shaping air Filter painting pattern P _2, supplies Operetoea the throttle valve DV.
As a result, the valve body 9 advances into the paint flow path 7 and the cross-sectional area of the paint flow path 7 is reduced to 50%. Therefore, a pressure loss is caused in that portion, the paint supply amount is reduced, and the small paint pattern P When painted with ₂ , thick coating does not occur.

Then, when moving to the wide portion W ₃ being while painting to supply paint to lower the supply pressure of the shaping air, return to the normal coating pattern P ₁ when simultaneously, Operetoea to throttle valve DV Stop supplying.
Thus, retracted valve member 9 from the paint passage 7, the cross-sectional area of the paint passage 7 is returned to 100%, the paint flow also returns to the original, it can be coated with conventional coating pattern P _1.

  In this way, the throttle valve DV can instantly increase or decrease the paint discharge rate with good responsiveness, so that even when the coating pattern is enlarged or reduced, the coating thickness does not change, and the coating such as sagging or scales can be applied. There is an effect that a uniform coating film can be formed without causing defects.

Further, the throttle valve DV is not limited to the case where the valve body 9 is moved forward and backward in the paint flow path 7, but is a case where the flow path area is reduced by crushing the paint flow path 7 from the outside as shown in FIG. Also good.
That is, in this example, the throttle valve DV reduces the flow path cross-sectional area by crushing the flexible resin pipe 11 constituting at least a part of the paint flow path 7 and the controllable resin pipe 11 from the outside. It consists of a cylinder 13 that drives the presser 12.

As a result, when the operating air is not supplied to the cylinder 13, the presser 12 attached to the piston 14 is retracted by the elastic force of the spring 15, so that the flexible resin pipe 11 constituting the paint flow path 7 is crushed. Therefore, the flow path cross-sectional area is maintained at 100%.
When the operating air is supplied to the cylinder 13, the presser 12 attached to the piston 14 advances against the elastic force of the spring 15, and the flexible resin pipe 11 constituting the paint flow path 7 is moved. By being crushed, the flow path cross-sectional area becomes 50%.

  If the flow passage cross-sectional area is changed by deforming the flexible resin pipe 11 as described above, the unevenness that becomes the paint reservoir is not formed in the paint flow path 7, and there is a merit that the cleaning property is excellent. .

The throttle valve DV is not limited to the case where the cross-sectional area of the paint flow path 7 is changed in two stages of 100% to 50%, but may be changed in multiple stages or in a non-stage manner. The cross-sectional change rate is also arbitrary.
In addition, the throttle valve DV that is changed in multiple steps or steplessly may be adjusted in valve opening, for example, by adjusting the supply pressure of the operating air.

  As described above, the present invention can be applied to a multicolor coating machine that selects and supplies an arbitrary paint from a plurality of paints.

Sectional drawing which shows the multi-color coating machine which concerns on this invention. Sectional drawing seen from the side. Explanatory drawing which shows a decomposition | disassembly state. The figure which shows the principal part of other embodiment. Sectional drawing which shows a conventional apparatus. The rear view.

Explanation of symbols

1 Multicolor coating machine 2 Body 5 Color change unit 7 Paint flow path CV Color change valve DV Throttle valve

Claims (5)

In a multi-color coating machine that incorporates a color change unit in which a required number of color change valves are arranged along the longitudinal direction of the paint flow path, and sprays the paint selected by the color change unit with an atomization mechanism,
A multi-color coating machine, wherein a remote control type throttle valve for changing a cross-sectional area of the paint channel is provided on the most downstream side of the paint channel formed in the color change unit.   In a color change unit for a painting machine in which a required number of color change valves are arranged along the longitudinal direction of the paint flow path, a remote for changing the cross-sectional area of the paint flow path to the most downstream side of the paint flow path A color change unit for built-in coating machines, which is equipped with an operation-type throttle valve.   The color changing unit for a painting machine according to claim 2, wherein the throttle valve is a throttle valve that is remotely operated by fluid pressure.   The color change unit for a painting machine according to claim 2 or 3, wherein a two-position throttle valve that changes the cross-sectional area of the paint channel in two stages is provided as the throttle valve. Of the paint flow path, at least a portion where the throttle valve is disposed is formed of a flexible resin pipe, and the throttle valve crushes the flexible resin pipe from the outside to reduce the flow path cross-sectional area. The color change unit for a painting machine according to claim 2, comprising:

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