JP2000061364A - Rotary spray coating apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress scattering loss of a coating material. SOLUTION: A plurality of spray nozzles C1, C2 are arranged respectively in a plurality of circumference tracks B1, B2 around a rotor rotation center D and this rotary spray type coating apparatus carries out coating of an article put on a conveyer by spraying a coating material out of the spray nozzles C1, C2 whose rotation track planes are parallel to the conveyer A face. The coating material supply systems to the spray nozzles C1, C2 on the respective circumference tracks B1, B2 are made to be different systems and separately controlled by hydraulic pressure control.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The invention of this application relates to a rotary spray coating apparatus. More specifically, the invention of this application makes it possible to reduce the scattering loss of paint and to suppress the occurrence of coating unevenness when continuously coating articles such as building materials that are placed on a conveyor and move. The present invention relates to an improved new rotary spray coating device.

[0002]

2. Description of the Related Art Conventionally, a rotor (rotating body) having a plurality of spray nozzles has been rotated as one of means for continuously coating articles such as building accessories placed on a conveyor. There is known a rotary spray coating device that sprays and paints from a rotating spray nozzle.

Regarding the coating by this rotary spray coating apparatus, for example, as shown in the plan view of FIG.
In the state where the article to be coated is placed on the conveyor (A) within the range of the effective inner width (W ₂ ) as the inner width excluding the chain cover guide etc. of the entire width (W ₁ ), normally,
The effective inner width (W ₂ ) of the rotor, which has a diameter (L) larger than the total width (W ₁ ) of the rotor, is equally spaced on the same circumference (B),
For example, a plurality of spray nozzles (C) are arranged at a pitch of 45 ° for coating. Such arrangement of the spray nozzles (C) is a method that has been empirically adopted from the viewpoint that the articles that move as uniformly as possible by the conveyor (A) are continuously applied. .

As for that, as for the conventional method,
It was considered to arrange the spray nozzle (C) so that the diameter (L) of the rotor was within the range of the overall width (W ₁ ) and effective inner width (W ₂ ) of the conveyor (A). In this case, The reason is that the coating unevenness occurred and it was not possible to apply a predetermined coating amount uniformly. Further, in the conventional coating method shown in FIG. 4, it has been considered necessary to rotate the rotor at a considerably high speed.

[0005]

However, in the coating by the conventional rotary spray coating device as described above, the effective inner width (W ₂ ) of the conveyor (A), and further the diameter of the rotor rather than the overall width (W ₁ ). Since (L) is large,
There is a problem that paint scattering loss is unavoidable unless the blowing out from the spray nozzle (C) outside the conveyor width is stopped. However, it is not always easy to equip a rotating rotary spray coating device with a mechanism for this stop.

Further, the fast rotation of the rotor itself in the conventional apparatus has been a cause of scattering loss of the paint.
This is because, with the arrangement of the spray nozzles as shown in FIG. 1, the entire width (W ₁ ) of the conveyor (A) is 1500 m.
m, effective inner width (W ₂ ): 1200 mm, rotor diameter (L): 2000 mm, the standard coating amount is 6 to 10 g
Assuming that the rotation speed of the spray nozzle (C) is set to 200 m / min in order to obtain / R ² , for example, if a water-based acrylic emulsion-based paint is used, scattering loss increases at speeds above 80 m / min. Because there was a problem. However, lowering the rotation speed in order to suppress such scattering loss is a contradiction that the conventional spray nozzle arrangement method as shown in FIG. 1 does not provide a required coating amount and causes coating unevenness. I had.

As described above, in the case of the conventional rotary spray coating apparatus, it is difficult to realize the required coating amount while suppressing the coating unevenness and reducing the scattering loss of the coating. . Therefore, the invention of this application solves the problems of the prior art as described above, can significantly reduce the scattering loss of the paint, and can also suppress the occurrence of coating unevenness. An object is to provide a spray coating device.

[0008]

SUMMARY OF THE INVENTION The invention of this application is to solve the above-mentioned problems. First, a plurality of sprays are provided on each of a plurality of circumferential orbits with respect to a center of rotation of a rotor. A rotary spray coating device for coating articles placed on a conveyor by spraying paint from a spray nozzle in which a nozzle is arranged and a rotation track surface is parallel to the conveyor surface. Provided is a rotary spray coating device characterized in that the paint supply system to the system is a separate system and the hydraulic pressure is controlled separately.

The invention of this application is, secondly, the rotary spray coating apparatus in which the paint supply system is divided and the hydraulic pressure is separately controlled after the paint passes through the filter. The total amount of paint sprayed from the spray nozzles on the circular orbit of is controlled to be smaller than the total amount of paint sprayed from the spray nozzles on the outer circumferential orbit. The number of spray nozzles arranged is the same, and the arrangement is such that a rotary spray coating device in which the angle between adjacent spray nozzles with respect to the center of rotation of the rotor is equal in each circumferential orbit, and fifth, the spray nozzles are cruciform rotors. To provide four rotary spray coating devices, one for each circumferential track.

Furthermore, the invention of this application is, in the sixth aspect, any one of the above-mentioned coating apparatuses, wherein the diameter of the outermost circumferential track in which the spray nozzles are arranged is contained within the width of the conveyor. Provided is a rotary spray coating device, characterized in that an article placed within the width of a conveyor is coated by spraying from a spray nozzle.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The invention of this application has the characteristics as described above, and the embodiments thereof will be described below. FIG. 1 is a schematic plan view illustrating the features of the present invention. For example, as illustrated in FIG. 1, in the rotary spray coating apparatus of the present invention, each orbit (B) on a plurality of circumferential orbits with respect to the rotor rotation center (D).
₁ ) (B ₂ ) with a plurality of spray nozzles (C ₁ ) (C ₂ )
Is arranged, and the article placed on the conveyor (A) is coated by spraying paint from spray nozzles (C ₁ ) (C ₂ ) whose rotational orbit surfaces are parallel to the surface of the conveyor (A).

In the embodiment shown in FIG. 1, four spray nozzles (C ₁ ) (C ₂ ) are arranged on each of two circumferential orbits (B ₁ ) (B ₂ ). Further, in the coating apparatus of the present invention, the supply of the coating material to the spray nozzles (C ₁ ) (C ₂ ) on each of the circumferential orbits (B ₁ ) (B ₂ ) is a separate system, and this supply system is The hydraulic pressure can be controlled separately.

With such a configuration, for example,
As shown in 1, the outermost circumferential orbit (B₁) Diameter
(L₁) Is the full width of the conveyor (A) (W₁), And more
Effective width (W ₂), The device shown in FIG.
The spray nozzle (C) is the width of the conveyor (A)
The problem of paint scattering loss that goes out of the room and dissipates the paint
It is possible to improve the problem.

The paint is effectively used for coating the articles placed in the effective inner width (W ₂ ) of the conveyor (A). Then, the occurrence of coating unevenness due to the paint is suppressed and the required coating amount is made uniform. That is, the reduction of paint scattering loss and the suppression of coating unevenness are facilitated by the rotary spray coating apparatus of the present invention.

From the prior art, as in the present invention, <I> arranging a plurality of spray nozzles on each of a plurality of circumferential orbits <II> coating material for spray nozzles on each of the circumferential orbits It was quite unexpected that the above-described excellent action and effect could be obtained by providing a separate system for the supply system and separately controlling the hydraulic pressure of the paint for each system.

The relationship of controlling the hydraulic pressure for each circumferential orbit depends on the number of circumferential orbits, the number and arrangement pitch of spray nozzles arranged on the same circumferential orbit, and the ejection of nozzles. The caliber, the distance between the plurality of circumferential orbits, the rotational movement speed of the spray nozzle by the rotor, and the like can be determined in consideration of the size and surface shape of the surface to be coated of the article, the type and properties of the coating material.

For example, as shown in FIG. 1, the coated surface of the article is
Effective inner width of conveyor (A) (W₂)
Then, the outermost circumferential orbit (B₁) Diameter (L₁) Is this valid
Inner width (W₂).
The width of the conveyor (A) outside
Controls the loss of charges. And the inner circumferential orbit
(B ₂) Diameter (L₂) Is set to suppress uneven application.
To do. Usually L₂Is 1 / 2L₁As a guideline
Can be adjusted.

The rotational orbital surface of the spray nozzle is assumed to be parallel to the conveyor surface. Being parallel here does not mean in a strict sense, but also includes being in a mutually parallel relationship. To separate the paint supply system for each different circumferential orbit, and to control the hydraulic pressure for each system,
It is more effective to control the hydraulic pressure separately by dividing the system after the paint is filtered. Foreign matter removal is the main purpose of the filter passing process, and pressure loss occurs.Therefore, if a different system is used at this stage, the degree of pressure loss will differ and the control of the supply hydraulic pressure will be performed while comparing the hydraulic pressure of each supply system. Is troublesome. Therefore, it is more practically effective to collectively perform the filter processing and then control the hydraulic pressure by dividing the system.

For example, FIG. 2 shows an example based on the above. The paint is sent from the paint reservoir (1) to the heater (3) by the plunger pump (2) and processed by the filter (4). After that, the paint is divided into two supply routes (a) and (b), and the regulator (51) is used.
(52) by by hydraulic control, for example, a spray nozzle (C ₁₎ on the outer circular path (B ₁₎ shown in FIG. 1 and the inner circular path (B ₂₎ spray nozzles on the (C ₂₎ The hydraulic pressure is separately controlled by different systems.

Regarding the control of hydraulic pressure, in general,
For example, the inner circumferential orbit (B₂) Spray
Nozzle (C₂The total amount of paint sprayed from
Orbit (B₁) Consideration to be less than the total blowing amount
To be done. Then, spray nozzles on the same circumference orbit
The outlet diameter is the same, and as shown in Figure 1, the circumference of each
Orbit (B₁) (B₂) Spray nozzle (C
₁) (C₂) Are equal, and the arrangement is
Circular orbit (B₁) (B₂) At the center of rotation of the rotor
If the angle between adjacent spray nozzles with respect to (D) is
For example, if it is the same as 90 ° in Fig. 1,
From the viewpoint of suppressing scattering loss and suppressing uneven coating
Is more appropriate in.

Of course, the present invention is not limited to the above depending on the size and surface shape of the surface to be coated. Also,
The number of circumferential orbits is not limited to two as shown in FIG. The pitch angle between the spray nozzles may be various such as 45 °. FIG. 1 shows a representative example that is actually suitable. And Fig. 1 shows two circular orbits (B ₁ )
Four spray nozzles (C ₁ ) on each (B ₂ )
An example in which (C ₂ ) is arranged in a cross shape at a pitch of 90 ° is shown. Such an arrangement is one preferable example, and more specifically, as illustrated in FIG. 3, the rotor (E) is in the shape of a cross bar having a cross shape, and a spray nozzle (C ₁ ) (C ₂ ) can be placed. The rotor (E) has a spray nozzle (C ₁ ) on a circular orbit (B ₁ ) (B ₂ ).
A supply pipe line is provided which serves as a separate system for supplying the paint to (C ₂ ). The arrangement as shown in FIGS. 1 and 3 on the cross-shaped rotor effectively suppresses the occurrence of coating unevenness.

Of course, although not shown, a rotary drive mechanism for the rotor (E) and a control mechanism therefor are also provided, although not shown. Actually, when the conventional apparatus shown in FIG. 4 is compared with the apparatus illustrated in FIGS. 1, 2, and 3, the results shown in Table 1 below are obtained. In either case, the spray nozzle has the same discharge port diameter, and the number of spray nozzles is the same in both the conventional example and the embodiment of the present invention.

It is possible to reduce the paint loss scattered outside the width of the conveyor, that is, outside the width of the surface of the article to be coated, and keep the maximum circumference of the spray nozzle within the width of the conveyor. The circumferential orbit diameter of the spray nozzle can be reduced by the rotor,
Since the peripheral speed can be suppressed, the paint loss that becomes a mist and scatters can be reduced. This is extremely effective when using a water-based emulsion paint or the like that is easily scattered.

It is an unexpected and remarkable effect that the effective utilization rate of the paint is improved by 20% or more as compared with the conventional case. As described above, according to the present invention, the productivity of the coating line is improved, and the installation space of the rotary spray coating device can be made compact. Moreover, in the embodiment of the present invention, the occurrence of coating unevenness is suppressed, and there is no problem in practical use.

[0025]

[Table 1]

[0026]

As described in detail above, according to the invention of the present application, a rotary spray coating apparatus that significantly suppresses the scattering loss of the paint as compared with the conventional one, aims at the effective use of the paint, and suppresses the occurrence of coating unevenness is provided. Provided.

[Brief description of drawings]

FIG. 1 is a plan view illustrating the arrangement of spray nozzles of the device of the present invention in relation to a conveyor.

FIG. 2 is a supply system diagram exemplifying supply of paint in different systems and separate hydraulic pressure control.

FIG. 3 is a perspective view illustrating an arrangement configuration of spray nozzles corresponding to FIG.

FIG. 4 is a plan view showing the arrangement of spray nozzles in a conventional device.

[Explanation of symbols]

A Conveyor B Spray Nozzle Circular Orbit B ₁ , B ₂ Spray Nozzle Circular Orbit C Spray Nozzle C ₁ , C ₂ Spray Nozzle D Rotor Rotation Center E Rotor 1 Paint Reservoir 2 Plunger Pump 3 Heater 4 Filter 51, 52 Regulator

Claims (6)

[Claims] 1. A plurality of spray nozzles are arranged on each of a plurality of circumferential orbits with respect to the center of rotation of a rotor, and the orbital surface is placed on a conveyor by spraying paint from a spray nozzle whose surface is parallel to the conveyor surface. Rotary spray coating device for coating various articles, characterized in that the paint supply system to the spray nozzles on each circumferential track is a separate system and the hydraulic pressure is controlled separately. apparatus. 2. The rotary spray coating apparatus according to claim 1 or 2, wherein the paint supply system is divided and the hydraulic pressure is controlled separately after the paint is passed through the filter. 3. The total amount of paint sprayed from the spray nozzles of the inner circumferential track is controlled to be smaller than the total amount of paint sprayed from the spray nozzles of the outer circumferential track.
A rotary spray coating device according to any one of 1 to 3. 4. The number of spray nozzles arranged in each circumferential orbit is equal, and the arrangement is such that the angle between adjacent spray nozzles with respect to the center of rotation of the rotor is equal in each circumferential orbit. Kano rotary spray painting equipment. 5. The rotary spray coating apparatus according to claim 1, wherein four spray nozzles are arranged on the cross-shaped rotor for each circumferential orbit. 6. The coating apparatus according to claim 1, wherein the diameter of the outermost circumferential track in which the spray nozzle is arranged is contained within the width of the conveyor, and the spray from the spray nozzle is used. The rotary spray coating device is characterized in that an article placed within the width of the conveyor is coated by the above.