RU7908U1 - DEVICE FOR APPLICATION OF POLYMERIC POWDER COATINGS - Google Patents

Description

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Device for applying polymer powder coatings

The utility model relates to techniques for applying polymer powder coatings and can be used in devices (fillers) for applying protective, anticorrosive, decorative and other coatings in various fields of the national economy.

When using tribostatic sprayers with a high degree of electrostatic charging of powder paint particles, the use of feeders with an ejected supply of powder paint to the electricizer is not feasible due to the high aerodynamic drag of the electricizer. For such sprayers, feeders are used with forced feeding of the air-powder mixture to the electrifier.

A device for coating is known (a.s. No. 1808394 from 07/19/90r, B05B 5/08). This device is equipped with a pipe for supplying atomizing air to the atomizer, made in the form of a prismatic container truncated to the outlet, while the ejector is vertically placed in the fluidization chamber, and the inlets to the atomizer of the powder-air mixture and atomizing air pipelines are mutually perpendicular. The inclined face of the truncated prismatic tank is made adjustable.

The disadvantages of the known device are:

- low degree of powder charging due to the design features of the device,

- Does not provide coloring of products of complex configuration. Closest to the proposed utility model is

electrostatic spray device for powder coating upon receipt of a friction charge (DE Patent No.

MKI B05B 5/03

3924425 from 07.24.89g, B05B 5/047). It consists of a device that supplies powder from the feeder, and a spray device, as well as an attachable rod of absorbing or electron-donating material. This rod (electricizer) has annular channels coaxial with respect to each other, which are interconnected from the side of the ends so that the powder particles pass through the annular channels in a zigzag fashion.

The disadvantages of the known device are:

- low degree of charging of particles of polymer powder and, as a consequence, not high enough quality of the applied powder coating;

-low performance of powder coating.

The technical objectives of this utility model are to improve the quality of the applied coating and increase productivity, i.e. increasing the efficiency of polymer powder coating.

These problems are solved in that in the device for applying polymer powder coatings containing a feeder connected to an electricizer, in which channels for passing the air-powder mixture are filled, a curved perforated membrane is additionally installed in the feeder, dividing it into a lower cavity with an inlet fitting and an upper a cavity connected through an outlet nipple to an electrizator, which is made in the form of a disk, on the round ends of which there are spiral grooves, so that the beginning of each groove is connected to the electric inlet ktrizatora, the output of each slot is connected to an outlet nozzle elektrizatora, wherein each side end of the round plate are arranged dielectric and conductive zazaemlennye screens, and dielectric plates provided with holes arranged in spirals, spiral grooves coaxial circular ends of the disc.

The utility model meets the criterion of novelty / since there are no known devices for applying powder coatings from publicly available information sources described by the above set of essential features.

The utility model is illustrated by drawings.

In Fig, 1 shows a General view of the device for applying powder coatings, in Fig.2 is a sectional view of the electrizator.

The device comprises a feeder made in the form of a sealed container 1, with a curved membrane 2 installed in it, which has a system of holes. On the membrane is a polymer powder loaded into the feeder. Compressed air is supplied to the feeder under pressure through the inlet fitting 3. Through the outlet nozzle 4 of the feeder through the channel 5, the air-powder mixture is supplied to the electricizer 6. The electricizer 6 consists of a solid disk 7 (figure 2) with spiral grooves 8 located on the round ends of the latter. On each side of the disk 7, dielectric plates 9 are adjacent to it, holes 10 are made in each plate in a spiral, which is coaxial with the spiral groove 8 of the disk 7. Conducting grounded electrodes II are located on top of the dielectric plates. The beginning of the spiral grooves of the disk 7 is connected to the inlet 12 of the electrizator b, and the output of the spiral grooves of the disk 7 is connected via a channel 13 to the nozzle 14 of the electrizator b.

The device operates as follows.

In the feeder 1 (figure 1) polymer powder through the opening cover. Through the inlet fitting 3, air is supplied to the feeder under pressure, which through the system of openings of the membrane 2 enters the part of the feeder in which the powder is located. Under the influence of air currents, fluidization of the powder occurs. Due to excess air pressure, the resulting air-powder mixture through the outlet nozzle 4 and the hose 5 is fed to the input 12 of the electricizer (figure 2). Entrance 12

located in the center of the dielectric disk 7 and connected to the beginnings of the spiral grooves 8. When the air-powder mixture passes through the grooves 8, as a result of centrifugal forces, the particles of the polymer powder repeatedly come into contact with the walls of the grooves and are electrified with a certain sign of electric charge. At the same time, charges of the opposite sign are created on the walls of the grooves 8 formed by the disk 7 and the dielectric plates 9, compared with the charge sign of the polymer powder particles, which reduce the degree of electrification of the polymer powder particles. To neutralize these charges in the plates 9 holes 10 are made, on the surface of which the charges from the surface of the grooves 8 pass to the screens II and then to the ground 15.

The air-powder mixture with the charged particles of the polymer powder, leaving the channels 8, is connected in the outlet nozzle of the electricizer 14. The air-powder torch is directed to the painted part. Under the action of electrostatic forces, the powder particles are attracted to the painted part. Then thermal coating polymerization is performed.

The proposed design of the utility model can be manufactured using known technology and does not require the use of special materials. It will find application in those areas of the national economy where it is required to obtain protective, corrosion-resistant and decorative coatings using polymer powders.

Claims (1)

A device for applying polymer powder coatings containing a feeder connected to an electrifier, in which channels for passing the air-powder mixture are made, characterized in that the feeder additionally has a curved perforated membrane dividing it into a lower cavity with an inlet fitting and an upper cavity connected through the outlet fitting with an electrizator, which is made in the form of a disk, on the round ends of which are located spiral grooves so that the beginning of each groove is connected to the input of the electrizato and, the output of each slot is connected to the outlet nozzle elektrizatora, wherein each side end of the round plate are arranged dielectric and conductive ground plane, and a dielectric plate provided with openings disposed along spirals coaxial helical grooves located on the circular ends of the disc.