CN218516959U

CN218516959U - Spraying device

Info

Publication number: CN218516959U
Application number: CN202222282224.9U
Authority: CN
Inventors: 郭亦之; 郭黎晓; 杨连收; 王允忠; 常小龙; 吴建
Original assignee: Jiangsu Bianselong Micro Powder Technology Co ltd
Current assignee: Jiangsu Bianselong Micro Powder Technology Co ltd
Priority date: 2022-08-29
Filing date: 2022-08-29
Publication date: 2023-02-24
Anticipated expiration: 2032-08-29

Abstract

The utility model relates to a spraying device, which comprises a powder spraying cover, wherein the bottom of a cover cavity of the powder spraying cover is provided with spray holes; and the at least two high-voltage electric needles are arranged at the cover opening of the powder spraying cover, and after being electrified, the high-voltage electric needles are suitable for discharging at the cover opening to form a charged area. The powder coating rate of the spraying is greatly improved and even is close to complete powder coating.

Description

Spraying device

Technical Field

The utility model relates to a powder coating field, concretely relates to spraying device.

Background

Compared with liquid coating, powder coating has the advantages of economy, high efficiency, environmental protection, energy Saving and the like (commonly called as 4E. The powder coating is applied by electrostatic spraying, and the powder of the powder coating in a fluidized state is injected into a spray gun from a pipeline by an air pump and sprayed out. As shown in fig. 1, the high voltage needle 2 is installed in the spray gun, the powder charges in the high voltage electric field formed between the high voltage electrostatic needle 2 at the nozzle of the spray gun and the grounded connection plate, and the charged powder drifts towards the substrate 1 under the dual action of the air flow and the electric field force and is adsorbed on the substrate 1 by the electrostatic force. And (3) crosslinking and curing the sprayed part at high temperature.

In the powder spraying process, a large amount of compressed air is inevitably used in the process of conveying the powder from the fluidization barrel to the spray gun and spraying the powder, when the powder is blown out of the spray gun and is close to a workpiece, the gas can also blow part of the powder away from the substrate, particularly the high-voltage electrostatic needle is arranged at the center of the nozzle of the spray gun, the electrostatic force action on the blown-out powder is weaker along with the farther the powder is separated from the central line, and more powder can not be sprayed on the workpiece particularly when the spray gun moves rapidly. In fact, the powder coating application rate is typically between 60% and 80% depending on the equipment and coating parameters, and on the workpiece. The fallen powder can be reused by a recycling device, but there are some negative effects and risks due to recycling of the powder. Firstly, the operation of the recovery facilities for recovering the powder, the maintenance thereof and the cleaning of the recovery equipment are very laborious, and secondly, the particle size of the recovered powder differs from that of the raw powder, which in turn increases the risk of quality problems. These conditions can become very serious problems in metal powder coatings and in small volume production. If a large amount of spray falls, the production quality and efficiency can be greatly improved. In the past, how to improve the powdering rate of powder has been a very important research topic. People do a lot of work in various aspects such as powder coating formula technology, high-voltage static application technology, coating process parameters and the like, and strive to improve the powder applying rate of powder spraying. In summary, increasing the application rate of powder coating is a very valuable task.

The reason that the powder falls off when powder is sprayed is analyzed, and the high-voltage electrostatic needle which is the main reason is arranged in the middle of a spray gun nozzle, so that the charging capacity and the electric field force of the scattered powder are not uniform. The two reasons are caused, one is the air flow which drives the powder to be sprayed out and close to the workpiece, and the powder is taken away while the air flow blows to the periphery; the other is a point in the center of the high voltage electrostatic needle that does not uniformly cover the enlarged area over which the powder is spread.

In order to solve the problem of low powdering rate, the problems of airflow dispersion and non-uniform high-voltage static electricity of customers are needed.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is: the defects of the prior art are overcome, and the spraying device is provided to solve the problem of low powder feeding rate in the past powder spraying process.

The utility model provides a technical scheme that its technical problem adopted is:

in a first aspect:

the powder is sprayed out along with high-pressure airflow, the powder is uniformly blown forwards, and the uniformly blown powder enters a charging area, so that the powder is uniformly charged and is adsorbed by a substrate under the action of uniform electric field force.

In a second aspect:

there is provided a spray coating device comprising

The powder spraying cover is characterized in that a spraying hole is formed in the bottom of a cover cavity of the powder spraying cover;

the high-voltage electric needles are arranged at the cover opening of the powder spraying cover, and after being electrified, the high-voltage electric needles are suitable for discharging at the cover opening to form a charged area;

the high-pressure airflow carries powder to be sprayed out of the spraying hole, the powder moves from the bottom of the cover cavity to the cover opening and is uniformly dispersed, and the powder is charged after entering the charging area so as to be adsorbed on the substrate in the charging area to finish powdering.

Furthermore, the powder spraying cover is of an arc semicircular structure.

Furthermore, the number of the high-voltage electric needles is two, three, four, five, six, seven or eight;

the high-voltage electric needles are uniformly arranged in the circumferential direction of the cover opening.

Furthermore, a plurality of airflow guide holes are formed in a cover opening of the powder spraying cover, and gas is sprayed out of the airflow guide holes to guide the flow direction of powder.

Further, the high-voltage electric needle penetrates out of the air flow guide hole.

Further, the cover body of the powder spraying cover is of a double-layer structure, and a clamping cavity is formed in the cover body;

each airflow guide hole is communicated with the clamping cavity, and compressed air is introduced into the clamping cavity and flows out of each airflow guide hole.

In a third aspect:

in the working method of the spraying device, each high-voltage electric needle is electrified to work so as to form a charged area at the cover opening of the powder spraying cover;

the powder is sprayed out from the spray hole at the bottom of the cover cavity along with the high-pressure airflow and enters the cover cavity, and the powder is uniformly blown to a charging area of the cover opening in the cover cavity, so that the powder is uniformly charged and is adsorbed by the substrate under the action of uniform electric field force.

The beneficial effects of the utility model are that:

the utility model provides a spraying method, spraying device and working method thereof can let spun powder locate in a great lotus electric scene, both let spun powder can carry on an electric charge uniformly and adsorbed by the base plate under even electric field force effect, can let almost all powder all carry on an electric charge and go up whitewashed again to realize the very big improvement of powder rate in the spraying, be close to the powder completely even.

The spraying device has high powder spraying rate and high powder spraying uniformity. The powder feeding rate close to 100 percent can be achieved at most.

The spraying device is used for coating metal powder and has high coating value. The high powdering rate has good repeatability, and stable and reliable production effect on the coating of the metal powder with unstable powdering rate.

Drawings

The present invention will be further explained with reference to the accompanying drawings.

FIG. 1 is a schematic view of the spray application of a conventional powder spray gun;

FIG. 2 is a schematic view of the spraying device of the present invention;

FIG. 3 is a schematic view of the powder spray cap orifice in elevation;

FIG. 4 is a schematic view of a powder spray cap with a cavity structure;

wherein the content of the first and second substances,

1. a substrate 2, a high-voltage electric needle;

3. a powder spraying cover 31, spray holes 32, airflow guide holes 33 and a clamping cavity.

Detailed Description

The invention will now be further described with reference to specific embodiments. The drawings are simplified schematic diagrams only illustrating the basic structure of the present invention in a schematic manner, and thus show only the components related to the present invention.

Example one

A spray method features that the powder is sprayed out with high-pressure airflow, and the uniformly blown powder is charged uniformly and adsorbed by substrate under the action of uniform electric field force.

The spraying method of the embodiment is essentially different from the traditional spraying method, the powder floats to the substrate under the dual action of the airflow and the high-voltage electrostatic field in the traditional spraying method and is adsorbed on the substrate by the electrostatic force, the charged powder can be blown away in the traditional spraying method, the dispersion of the powder is weaker as the powder is separated from the central line, and more powder can not be sprayed on a workpiece particularly when a spray gun moves rapidly; in the existing spraying method, the powder is not electrified when being sprayed, the powder enters a charging area after being uniformly dispersed to be electrified, and the electrified powder is directly adsorbed by a substrate in the charging area, so that the spraying powdering rate is greatly improved, and even is close to complete powdering.

Example two

As shown in fig. 2 to 4, a spraying device includes a powder spraying cover 3, and a spraying hole 31 is formed at the bottom of a cover cavity of the powder spraying cover 3;

the high-voltage electric needles 2 are arranged at the cover opening of the powder spraying cover 3, and after being electrified, the high-voltage electric needles 2 are suitable for discharging at the cover opening to form a charged area;

the high-pressure airflow carries powder to be sprayed out from the spray hole 31, the powder moves from the bottom of the cover cavity to the cover opening and is uniformly dispersed, and the powder is charged after entering the charging area so as to be adsorbed on the substrate in the charging area, so that the powdering is completed.

Specifically, as an optional implementation manner in this embodiment, as shown in fig. 2, the powder spraying cover 3 has an arc-shaped semicircular structure.

Specifically, as an optional implementation manner in this embodiment, as shown in fig. 3, the number of the high-voltage electric needles 2 is two, three, four, five, six, seven, or eight;

the high-voltage electric needles 2 are uniformly arranged in the circumferential direction of the cover opening.

In this embodiment, four high-voltage electric needles 2 are selected.

The more the electric needles, the more uniform the electric field, but the strength will decrease. Preferably three or four, which can achieve the purpose of uniform and wide range of electric field and has enough area.

Each high-voltage electric needle 2 is connected with high-voltage static generating device respectively to make each high-voltage electric needle 2 can discharge, high-voltage electric needle 2's theory of operation is the same with high-voltage electric needle 2's mounting means in traditional spraying equipment, in this embodiment, has only increased high-voltage electric needle 2's quantity and has changed high-voltage electric needle 2's mounted position.

Specifically, as an alternative embodiment in this embodiment, as shown in fig. 2 and fig. 3, a plurality of airflow guide holes 32 are opened at the cover opening of the powder spraying cover 3, and the gas is sprayed from the airflow guide holes 32 to guide the flow direction of the powder.

The air flow guide holes 32 are uniformly distributed at the cover opening, and the air flow sprayed out of the air flow guide holes 32 can form a circular air column, so that the powder is prevented from diffusing to the periphery, and the powder is always limited in a circular area formed by the air column.

Specifically, as an alternative embodiment in this embodiment, as shown in fig. 2 and fig. 3, the high-voltage electric needle 2 protrudes out of the air flow guide hole 32.

Since the high voltage electric needles 2 pass through the air flow guide holes 32, the compressed air passing through the air flow guide holes 32 can prevent the electric needles from being dusted.

Specifically, as an optional implementation manner in this embodiment, as shown in fig. 4, a cover body of the powder spraying cover 3 is of a double-layer structure, and a clamping cavity 33 is formed in the cover body;

each of the airflow directing holes 32 communicates with the nip chamber 33, and compressed air introduced into the nip chamber 33 is adapted to flow out through the airflow directing holes.

In operation, compressed air is discharged from each air flow guide hole after entering the clamping chamber 33, thereby preventing powder from being deposited on the electric needle.

In this embodiment, the powder spraying cover 3 is made of insulating plastic, such as polypropylene plastic, preferably polytetrafluoroethylene plastic.

The other facilities of the spraying apparatus are almost the same as those of the conventional apparatus, as are the electrostatic generating apparatus, the fluidization and supply of the powder, and the powder supply and gas supply facilities of the spraying apparatus.

EXAMPLE III

Providing a working method of the spraying device in the second embodiment, electrifying each high-voltage electric needle 2 to work so as to form a charged area at the cover opening of the powder spraying cover 3;

the powder is sprayed out from the spray hole 31 at the bottom of the cover cavity along with the high-pressure airflow and enters the cover cavity, and the powder is uniformly blown to a charging area of the cover opening in the cover cavity, so that the powder is uniformly charged and is adsorbed by the substrate under the action of uniform electric field force.

The utility model provides a spraying method, spraying device and working method thereof can let spun powder locate in a great lotus electric scene, has both let spun powder can be the lotus electric uniformly and adsorbed by the base plate under even electric field force effect, can let almost all powder all be lotus electric and go up whitewashed again to realize the very big improvement of powder rate in the spraying, be close to the complete powdering even.

In light of the foregoing, it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims

1. A spraying device is characterized by comprising

the high-pressure airflow carries powder to be sprayed out of the spray hole, the powder moves from the bottom of the cover cavity to the cover opening and is uniformly dispersed, and the powder enters the charged area and then is charged so as to be adsorbed on the substrate in the charged area, so that the powdering is completed.

2. The spray coating device of claim 1 wherein,

the powder spraying cover is of an arc-shaped semicircular structure.

3. The spray coating device of claim 1 wherein,

the number of the high-voltage electric needles is two, three, four, five, six, seven or eight;

4. The coating device of claim 1 wherein,

and a plurality of airflow guide holes are formed in the cover opening of the powder spraying cover, and gas is sprayed out of the airflow guide holes to guide the flow direction of powder.

5. The coating device of claim 1 wherein,

the high-voltage electric needle penetrates out of the air flow guide hole.

6. The spray coating device of claim 4 wherein,

the cover body of the powder spraying cover is of a double-layer structure, and a clamping cavity is formed in the cover body;