JPH0283064A - painting equipment - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field 1 Is the present invention a coating device? In particular, the present invention relates to a coating device that can continuously and satisfactorily coat an object to a desired thickness regardless of its surface properties.

[Prior art and problems to be solved by the invention] Conventionally,
Various types of equipment have been proposed for continuous painting of objects to be coated while conveying them on a conveyor in electronic manufacturing facilities.

For example, when painting a flat plate, conventionally the paint is
An air spray type or airless spray type apparatus, which atomizes fine particles with a diameter of 80 μm for coating, or a roll coater or a carpet flow coater is used.

However, since the air spray painting equipment and airless spray painting equipment mentioned above atomize the paint, the painting efficiency is poor, and the paint mist scatters to a large extent, causing contamination of equipment and safety. Hygiene - May cause harm to humans and pollution. Further, when the surface of the object to be coated is uneven, the roll coater cannot coat the concave portions well. In addition, the flow coater has the disadvantage that it can only coat 41 coats, and especially cannot coat the sides.

Furthermore, since the coating film thickness of the spray coating apparatus ff and the flow coater changes depending on the conveyance speed of the object to be coated, it is necessary to accurately control the conveyance speed. Also, ■−
Conventional coating equipment supplies paint uniformly over the entire surface of the object to be coated, regardless of its surface condition. There is a problem that the thickness becomes non-uniform. Therefore, even under the same coating conditions, the coating film thickness changes depending on the difference in the surface properties of the object to be coated, and there is a possibility that the desired film thickness accuracy cannot be maintained.

Therefore, the present invention does not have one or more of the problems of the prior art, and in particular, it can be easily coated to a desired thickness regardless of the surface properties of the object to be coated, and furthermore, it is possible to coat both upper and lower surfaces and both sides simultaneously. The purpose is to provide a coating device that can.

[Means for Solving the Problems] According to the present invention, the above object is achieved by disposing means 6 for transporting the object to be coated through the painting chamber, and transporting the object to be coated through the painting chamber by the transport means. A coater head is provided to supply paint to the object being transported, and at the outlet of the object to be coated in the coating room F, there is a 1. A coating device, characterized in that the coating device is provided with means for blowing gas toward the direction of the coating device, and further provided with means for reducing the pressure inside the coating chamber.

This is achieved by

In the coating apparatus of the present invention, the opening of the outlet of the object to be coated in the coating chamber may be formed to include a shutter for the opening, and the shutter may include a part of the gas spraying means.

In the coating apparatus of the present invention, means can be provided for recovering the paint supplied from the coater head in the coating chamber and not contributing to the formation of the paint film.

Furthermore, in the coating apparatus of the present invention, a paint mist collecting means can be disposed at the connection between the coating chamber and the means for reducing the pressure inside the coating chamber.

[Embodiments] Specific embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic diagram showing an embodiment of a coating apparatus according to the present invention.

In these figures, reference numeral 2 denotes a coating room, in which means for transporting the object 4 to be coated horizontally is arranged. The conveying means includes a conveyor 6 that supplies the workpiece 4 from outside the painting room 2 into the painting room, a roller 8 disposed inside the painting room 2, and a workpiece that is discharged from the inside of the painting room 2 to the outside of the painting room. 4 and a conveyor 10 for picking up the receiver. still,
As the conveyor 10, a belt conveyor, a roller conveyor, etc. can be used and there is no particular restriction, but a roller conveyor is preferable when painting the lower surface of the object.
, 8a are presser rollers that are biased toward the conveyor 6 and roller 8, respectively.

In the painting room 2, there are objects to be coated 4 by means of conveying the objects to be coated.
An outlet 14 is provided through which the object to be coated 4 is discharged by means of conveying the objects I2 and 1-2. Also, in the painting room 2, there is an opening [
] A 1-upwardly movable shutter 16, which can be of limited shape and block off the population, is mounted above the entrance, and by its lower edge [- the exit 1
A vertically movable shutter 18 that can limit the shape of the opening 4 and close the exit 1 is mounted above the exit. Note that the shutter 18 also serves as an air blow head, and 19 is a blower for sending compressed air to the head. The air blow head 18 is installed in the painting room 2 at an angle of, for example, 20 to 60 degrees with respect to the horizontal direction.
Air can be blown diagonally downward toward the inside. In addition, 16a and +8a each have their own shutter 1 on top.
6.18 is an actuator for upward movement.

In the coating chamber 2, a downward-facing coater head 20 for supplying paint to the object to be coated 4 is disposed above the movement path of the object to be coated 4 transported by the object conveying means.

The coating chamber 2 is provided with a paint storage section 22 for collecting paint discharged from the coater head 20 but not contributing to the formation of a coating film on the surface of the object 4 to be coated. Further, a blower 24 is connected to the painting chamber 2 as a means for reducing the pressure inside the painting chamber, and at the connection point there is a blower 24 in the painting chamber 2 that blocks the gas flow path when the blower 24 exhausts air. A paint mist collection filter 26 is arranged as shown in FIG. Further, in the painting chamber 2, there are provided baffles 28, 30, and 32 to block the paint mist generated during exhaust by the blower 24 described in -1-.

A new paint tank 34 is arranged outside the painting room 2 described in 1, and the tank 34, the paint storage section 22 in the painting room 2 described in -1, and the coater head 20 in the painting room 2 are connected to the pump 3.
6 and a piping system including valves. As a result, new paint can be supplied to the coater head 20 from the paint tank 34 in a desired flow n1, and recovered paint can be supplied from the paint storage section 22.

Incidentally, a pressure reduction degree adjusting valve 37 is connected to the painting chamber 2 in order to suppress the degree of pressure reduction caused by exhaust gas from the blower 24 from becoming excessive.

Further, 39 is a sensor for detecting the object to be coated 4 conveyed on the Juki conveyor 6F.

FIG. 2 is a cross-sectional front view of the part 11 in the painting chamber 2 for objects to be coated in the present embodiment.

In the figure, reference numeral 38 denotes an opening setting member whose position can be set in the lateral direction to limit the right side of the opening [ ] of the outlet 14 of the painting room 2. 1 Although not shown, there is also a similar opening setting member on the left side. 6 When the object 4 to be coated is a plate-shaped object and the - side of the plate-shaped object is to be uniformly coated, the object 4 to be coated is placed at the outlet 1.
4, the outlet opening is located exactly in the center of the outlet opening so that the gaps 40 between the opening and both sides and both left and right end surfaces of the object 4 are, for example, 1 to 5 mm. , the lateral position of the opening setting member 38 and the vertical position of the shutter (air blow head>18) are set. However, the above-mentioned gap can be changed as appropriate depending on the degree of vacuum in the painting chamber 2 during painting, etc. .

Hereinafter, the vicinity of the exit 14 has been described, but the vicinity of the 5 population 12 is also the same as the vicinity of the exit.

Next, the operation of the coating apparatus of this embodiment will be explained.

While reducing the pressure inside the painting chamber 2 with the blower 24, the pump 3
6 is operated to supply new paint from the paint tank 34 to the coater head 20. At this time, 1 person I'l + 2
and output [114] respectively move the shutters 16 and 18 to the talker in 1 minute and keep them closed.

The object to be coated 4 is conveyed in the direction by the object conveying means, and when the leading edge of the object to be coated is detected by the sensor 39, the shutter 16 is moved upward to form a predetermined human 111HII shape. , the object to be coated 4 is supplied into the coating chamber 2 through the opening.

In the coating chamber 2, the coater head 2
Paint is supplied from 0. This supply of paint is set so that the amount of time required for one supply of paint is 11 minutes in excess of that required to form a coating film of a desired thickness. Therefore, a coating film that is sufficiently thicker than the desired thickness is formed on the first side of the object 4 in the coating chamber 2. It should be noted that since the pressure inside the painting room 2 is reduced, outside air flows into the painting room from outside the painting room 2 through the opening 1, so that the paint does not scatter to the outside from the inlet opening.

FIG. 3 is a sectional view showing the state in which the object 4 to be coated leaves the coating chamber 2. As shown in FIG.

After a predetermined time after the sensor 39 detects the beginning of the object to be coated, the shutter 18 is moved upward to form a predetermined exit opening shape, and the object to be coated 4 is discharged from the opening to the outside of the coating room 2. 1. Simultaneously with the upward movement of the shutter (air blow head) 18, the operation of the blower 19 is started and compressed air is discharged obliquely downward from the air blow head 18 toward the painting chamber 2. As a result, compressed air is blown onto the upper surface of the object to be coated 4 passing through the outlet opening.

When the object 4 to be coated passes through the opening of the eye 14, the coating chamber 2
Since the interior is reduced in JE, outside air flows from outside the painting room 2 into the inside of the painting room 2, and at the same time, the air blow head 18
Since compressed air is blown onto the surface of the object,
Due to the air flow flowing into the coating chamber 2, a predetermined slight gap 44 is formed between the air blow head 18 and the paint 42 on the surface of the object 4 to be coated, and thus a desired 11-degree separation is achieved within the coating chamber 2! The coating film, which had been formed thickly in the gap 4
A portion exceeding a predetermined thickness is removed by the airflow flowing through the coating material 4, and when the coating material 4 is discharged outside the coating chamber 2, a coating film of a constant desired thickness has been formed.

In this case, no matter what the surface quality of the object 4 is, the coater head 20 starts from the paint supply position 1-
The paint is applied to the object 4 as appropriate depending on the surface properties before reaching the first part.
Since the coating film is absorbed into the interior, the coating film thickness when exiting the outlet section becomes a predetermined thickness.

Since the pressure inside the painting chamber 2 is reduced, outside air flows into the painting chamber from outside the painting chamber 2 through the outlet opening, and the compressed air discharged from the air blow head 18 is directed toward the painting chamber 2. Therefore, the paint will not scatter to the outside from the opening [1].

In this embodiment, since air blowing is performed, even if there is an uneven pattern on the -L surface of the object 4, a coating film of a constant thickness can be faithfully formed in accordance with the uneven pattern. Can be done.

The shutters 16, 18 are each moved downward after a predetermined time after the sensor 39 detects the last end of the object 4 to be coated, and the inlet and outlet openings are closed. , the timing of the movement of these shutters 16.degree. 18 is appropriately set according to the conveyance speed of the object 4 to be coated.

Note that when the object 4 to be coated passes through the opening 12 and/or the opening [-1 of the exit 14, the cross-sectional area of the communicating portion between the coating chamber 2 and the outside becomes smaller than at other times. ,
By appropriately setting the exhaust force of the blower 24 and the pressure reduction degree adjustment valve 37, air can be appropriately introduced into the coating chamber 2 from the valve 37 when the object to be coated passes, and the degree of pressure reduction in the coating chamber 2 can be kept almost constant. can be maintained.

As painting continues, the paint dropped from the coating position iZt is collected in the paint storage section 22, so the collected paint can be filtered as needed and supplied to the coater head 20 at the appropriate time for painting. .

Furthermore, when the blower 24 exhausts air, the filter 26 collects the soot mist.

In addition, in the apparatus of this embodiment, by arranging an appropriate jig in the coating chamber 2, the paint is not partially supplied to the object 4 to be coated, so that a coating film is not formed partially. be able to.

Furthermore, by arranging the coater head below and to the side of the conveyance path of the object to be coated in the coating chamber 2, it is possible to coat the top and side surfaces of the object to be coated5. In this case,
Air blow heads can also be placed above and to the sides of the conveyance path of the object to be coated to perform AL air blow.

FIG. 4 and FIG. 5 are both schematic perspective views showing the vicinity of the projecting portion of another embodiment of the coating apparatus according to the present invention.

In the embodiment shown in FIG. 4, a triangular hood 50 is attached to the outlet of the bag chamber 2, and the object 4 to be coated is discharged from an opening formed in the end face of the hood.

Incidentally, although not shown in the drawings, there is a
An air blow head as described in the embodiment shown in FIGS. The illustrated angle θ (the angle between the hood end face and the hood end face perpendicular to the forward direction) is, for example, 20 to 60 degrees.

According to this embodiment, since the length of the outlet is increased, the effect of suctioning outside air into the bag chamber and air blowing is enhanced, resulting in better coating performance.

The embodiment shown in FIG. 5 is similar to the embodiment shown in FIG. 4 except for the shape of the hood 52. The illustrated angle θ is, for example, 2
It is 0 to 60 degrees. This embodiment is suitable for painting relatively wide objects.

[Effects of the Invention] As explained in detail above, according to the coating apparatus of the present invention,
It can be easily painted to the desired thickness regardless of the surface properties of the object being covered.
In particular, even when the surface of the object to be coated has an uneven pattern, it is possible to faithfully form a coating pattern of a constant thickness in accordance with the uneven pattern, and it is also possible to coat both the upper and lower surfaces and both sides simultaneously. Can do 6

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing a coating apparatus according to the present invention. FIG. 2 is a partially sectional front view of the vicinity of the outlet of the object to be coated in the coating chamber of the coating apparatus according to the present invention. FIG. 3 is a small sectional view of the state in which the object to be coated leaves the coating room. 4 and 5 are schematic perspective views showing the vicinity of the exit part of the coating apparatus according to the present invention. 2. Painting room; 4. Object to be coated. 6.10: Conveyor; 12: Person 1- ", 14: Outlet, 1 (3: Shutter, 18: Shutter (air blow head) 19. 24, Blower, 20: Coater head. 22, Paint storage section, 26, Filter, !34 = New paint tank. 36.Pump, Komi 9-Sensor for detecting the position of the object to be coated. Figure Figure Procedure Number 1F Book Method % Formula % Name of the invention Person who supplements the coating device / Relationship with the 1v matter

Claims (4)

[Claims] (1) A means for transporting the object to be coated via the painting chamber is arranged, and a coater head is provided in the painting chamber for supplying paint to the object to be coated that is transported by the transport means. , the outlet of the object to be coated in the painting chamber is provided with means for blowing gas toward the inside of the coating chamber when the object passes through; A coating device, characterized in that it is provided with means for reducing pressure. (2) The coating apparatus according to claim 1, wherein the opening of the outlet of the object to be coated in the coating chamber is formed to include a shutter of the opening, and the shutter includes a part of the gas blowing means. (3) The coating apparatus according to claim 1 or 2, further comprising means for recovering paint supplied from the coater head in the coating chamber and not contributing to coating film formation. (4) Claim 1, wherein a paint mist collecting means is disposed at a connection between a painting chamber and a means for reducing the pressure inside the painting chamber.
3. The coating device according to any one of 3 to 3.