JPS6139110B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a metal conveyor 1 that is horizontally conveyed in the upper opening of a painting booth 5, and a locking tool 2 that inserts and locks one end of a cement tile 3 into the conveyor 1. A large number of cement tiles 3 are arranged at equal intervals, and one end of the cement tile 3 is locked to the U-shaped locking tool 2, and the other end of the cement tile 3 is placed next to the adjacent locking tool 2 so that the other end of the cement tile 3 is overlapped with the adjacent locking tool 2. The distance between the matching locking tools 2 is made equal to the length of the exposed part of the cement tile 3 in the front and back direction, and the painting booth 5 is installed.
A powder electrostatic coating machine 4 is located below the conveyor 1 and is used to apply a high voltage between it and the conveyor 1 for electrical painting, and a coating booth 5 is equipped with a powder coating machine 4 for collecting powder coating. A cement tile painting device characterized in that it is connected to a powder paint collection device 6 and is provided with a low-temperature heating device 21 for melting and integrating the low-melting point powder paint adhered to the cement tile 3. An object of the present invention is to provide a cement tile coating device that can efficiently, accurately and firmly coat cement tiles, and can easily recover the paint and use it again.

The present invention will be explained in detail below with reference to Examples.

In the figure, reference numeral 5 denotes a painting booth made of an insulator. A powder electrostatic coating machine 4 is installed inside the painting booth 5, and an opening in the upper part of the painting booth 5 has a mechanism for transporting the powder in the horizontal direction. A metal conveyor 1 such as a chain or a caterpillar is disposed, and a large number of U-shaped locking tools 2 are spaced at equal intervals on this metal conveyor 1. This locking tool 2 is a cement tile 3
They are attached at intervals equal to the length of the exposed part in the front and back direction. An air vent 7 is provided at the bottom of the coating booth 5, and the air vent 7 is connected to a powder paint collecting device 6 via a duct. 8 in the figure is a fan. In FIG. 1, 9 is a powder supply pipe, and 10 is an air supply pipe. The tip of the powder supply pipe 9 and the air supply pipe 10 communicate with the rear end of the mixing pipe 11. A plurality of nozzles 12 are provided protrudingly. The mixing tube is made of metal and serves to charge the powder paint. The nozzle 12 has a shape that becomes narrower toward the tip, and the tip has a narrow elongated hole shape. In the figure, reference numeral 15 denotes an outside gas supply pipe, from which a plurality of jet ports 16 are protruded, and each jet port 16 is connected to the nozzle 1.
It is located between 2. The spout 16 becomes wider toward the tip, and both edges of the tip are connected to the upper ends of the adjacent nozzles 12, and from this spout 16, the nozzle 1
Air-like gas is ejected at a slower ejection speed than the ejection speed from No. 2, and serves to fly the powder upward. In the figure, 18 is a high voltage generator. A low-temperature heating device 21 is arranged in front of the conveyor 1, and after electrostatically coating the cement tile 3 with powder paint, the cement tile 3 is turned upside down and placed on a drying conveyor 22, and the low-temperature heating device 21 is placed in front of the conveyor 1. The low-melting point powder coating adhered to the cement tiles 3 is melted and integrated by a low-temperature heating device 21, and the surface is smoothed.

Next, the operation of the cement tile coating apparatus configured as described above will be explained. First, one end of the cement tile 3 is inserted and locked into the U-shaped locking tool 2 of the conveyor 1, and the other end of the cement tile 3 is overlapped with the adjacent locking tool 2, so that the cement tile 3 is placed in a roofing state. The cement tiles 3 are arranged side by side and transported in a suspended state.
On the other hand, the powder coating supplied from the powder supply pipe 9 is mixed with the air supplied from the air supply pipe 10 and is charged when moving into the mixing pipe 11, and the charged powder coating is transferred upward from the nozzle 12. However, since there is a high potential difference between the electrostatic powder coating machine 4 and the metal conveyor 1, the powder coating becomes charged due to the action of the electric field generated between them. accelerated,
It flies to the metal conveyor 1 side and is painted on the exposed parts of the cement tiles 3. Here, a gas ejection port 16 is located between each nozzle 12, and gas such as air is ejected from the ejection port 16, causing the powder paint to fly up to the cement tile 3 side. In addition to improving adhesion to the cement tiles 3, the powder paint is designed to not fall onto the nozzle 12 and spout 16 side, and the excess powder paint that does not adhere to the cement tile 3 flies up and floats to the air. The air is blown in from the air vent 6 by a fan 8 provided at the vent 6, sent to the powder paint collection device 6, and collected by the powder paint collection device 6. . Here, the powder paint collection device 6 may be connected to a powder supply box 17 connected to the powder supply pipe 9, and the collected powder paint may be reused as is. For example, a cyclone is used as the powder paint collecting device 6. On the other hand, the cement tiles 3 electrostatically coated with powder paint are placed upside down after being coated on the drying conveyor 22, and then placed on the drying conveyor 22.
At step 1, they are heated at a low temperature to be integrated and have a flat surface. Here, cement tile 3 is
Since heating at 150°C or higher for a long period of time causes aging, the heating temperature is preferably 150°C or lower, for example, heating at 130°C for 20 minutes. Of course, the heating temperature and heating time will vary depending on the type of powder coating used, but as mentioned above, the powder coating used in the present invention will age if the cement tile 3 exceeds 150°C.
A so-called low melting point powder coating that melts at 150°C or lower is used. Examples of low melting point powder coatings include those consisting of 40 to 80% by weight of polyvinyl chloride resin, 25 to 5% by weight of thermoplastic polyester resin, and 35 to 15% by weight of polyethylene resin, and having a particle size of 30 mesh or more. Polyvinyl chloride resin improves impact resistance, polyester resin improves abrasion resistance and toughness, and polyethylene resin improves toughness, cold resistance, and flowability. By adding polyethylene resin, the melting point of the entire product is made to be as low as 120°C to 140°C. Furthermore, cement tiles 3
Preheating device 2 when electrostatically applying powder paint to
In Step 3, the cement tiles 3 may be preheated at a relatively low temperature that does not cause aging. FIG. 4 shows another embodiment of the powder electrostatic coating machine 4, in which the mixing tube 1
A baffle plate 13 is provided at the tip of the nozzle 12 at the tip of the nozzle 1, and an outer cylinder 14 is screwed into the nozzle 12 so as to be freely forward and backward. Note that the inner surface of the outer cylinder 14 may be provided with a spiral to impart helical rotation to the annular air flow. Here, the powder paint and air are ejected from the nozzle 12, and the powder paint is charged by charging the nozzle 12 or the baffle plate 13. Also, high pressure gas is ejected along the inner surface of the outer cylinder 14. When using this type of electrostatic coating machine 4, one or a plurality of them are arranged in rows and columns depending on the size and shape of the cement tiles 3 and the state of coating. In addition, 19 in FIG. 2 is an arm for supporting the U-shaped locking tool 2 on the conveyor 1.
In the embodiment shown in FIG. 2, the chain elements 20 are attached to the pivot portions of each other.

In the present invention, a metal conveyor for conveying horizontally is arranged in the upper opening of the painting booth, and a large number of locking tools for inserting and locking one end of the cement tiles into the conveyor are arranged at equal intervals. While one end of the cement tile is locked to the U-shaped locking device, the distance between adjacent locking devices is adjusted so that the other end of the cement tile can be overlapped with the adjacent locking device. The length in the front and back direction is equal, and the powder electrostatic coating machine located below the conveyor is installed inside the painting booth, so the cement tiles are held and transported side by side in the same condition as when covering the roof. It can be applied to cement roof tiles by spraying powder paint from a powder electrostatic coating machine located below. This prevents paint from adhering (powder paint will adhere to the conveyor if the spacing between the locking tools is wider than the length of the exposed part of the cement tile), and prevents powder paint from adhering to the excess area. It has the advantage of saving on body paint, and since the powder electrostatic coating machine is located below the conveyor, only the required amount of powder paint is applied to the cement tiles, and the excess powder paint is applied to the cement tiles. This makes it possible to paint more accurately by falling down, and it also makes it easier to collect the powder paint because the excess powder paint falls off the cement tiles.In addition, there is a powder paint collection system that collects the powder paint in the painting booth. Since the equipment is connected, the powder paint that falls into the painting booth can be efficiently collected by the powder paint collection equipment, and the collected powder paint can be reused. Since the conveyor is placed in the upper opening, it has the advantage that the powder paint does not scatter above the conveyor, and it also melts and integrates the powder paint with a low melting point that has adhered to the surface of the cement tile. Since it is equipped with a low-temperature heating device, it is possible to spread and integrate the powder coating and adhere it firmly and evenly.
Since the powder coating has a low melting point and is heated using a low-temperature heating device, it has the advantage that the cement tiles do not age.

[Brief explanation of the drawing]

Fig. 1 is a schematic sectional view of the apparatus of the present invention, Fig. 2 is an enlarged perspective view, partially cut away, of the same powder electrostatic coating machine;
Figure 3 is a partially enlarged sectional view of the same conveyor as above;
The figure is a sectional view of another embodiment of the powder electrostatic coating machine, in which 1 is a conveyor, 2 is a locking device, 3 is a cement tile, 4 is a powder electrostatic coating machine, and 5 is a coating booth. It is.

Claims (1)

[Claims] 1. A metal conveyor is placed in the upper opening of the painting booth to transport the tiles in a horizontal direction, and a large number of locking tools for inserting and locking one end of the cement tiles into the conveyor are installed at equal intervals, and a U-shaped locking device is installed. With one end of the cement tile locked in the fixture, the other end of the cement tile can be stacked on the adjacent locking device, so the distance between adjacent locking devices is adjusted to the length of the exposed part of the cement tile in the front and back direction. The paint booth is equipped with a powder electrostatic coating machine that is located below the conveyor and applies high voltage between it and the conveyor to perform electrostatic coating, and the powder paint is collected in the coating booth. Connect the powder coating collection device of
A cement tile coating device characterized by being equipped with a low temperature heating device for melting and integrating low melting point powder coatings adhering to cement tiles.