KR20180022479A - Powder coating system using zinc primer and powder coating method thereof - Google Patents

Abstract

The present invention relates to a zinc primer powder coating system and a powder coating method using the same. The system of the present invention comprises: a loading/unloading device (100) for loading or unloading an object to be coated; a transfer device (10) continuously operating to move along a constant track and transferring the loaded object to be coated; a short blast device (150) disposed on the pathway of the transfer device (10) to wash the surface of several objects to be coated; a zinc primer device (200) disposed after the short blast on the pathway of the transfer device (10) to apply zinc paint to the object to be coated and coat the surface; and a heating device (420) disposed after the zinc primer device (200) on the pathway of the transfer device (10) to heat zinc-coated object. According to the present invention, a zinc material is coated on the surface of an object to be coated, thereby providing corrosion resistance similar to that of a melting galvanized steel sheet, and a zinc primer is used for coating without a separate plating process to enhance working speed.

Description

[0001] The present invention relates to a zinc primer powder coating system and a powder coating method using the zinc primer powder coating system,

The present invention relates to a powder coating system, and more particularly, to a system for coating a powder using a zinc primer having excellent corrosion resistance through a zinc primer system and a method for powder coating using the system.

Generally, in the production lines of metal industrial products such as guard rails, the painting process is carried out to prevent corrosion and enhance the appearance after the product is completed. Recently, unlike the above-mentioned coating system in which the liquid coating material is applied, since the environmental problem of the liquid coating material is regulated by the global regulations, it is possible to apply the powder coating material containing no volatile organic compound (VOC) There is a demand for continuous development and application of coating systems.

The powder coating operation using such a powder coating material is performed by applying a paint to the outer surface of the material to be coated and then drying it. In general, the electrostatic powder coating is a method of obtaining a coating film by using a powder coating material, which is a solvent-free coating material, unlike a liquid coating, and arriving at the object to be heated and melting it.

In addition to such a powder coating method, a hot dip galvanized steel sheet (HGI, HOT DIPPED GALVANZED-IRON) may be used to further enhance the corrosion resistance of the product. Such a hot-dip galvanized steel sheet is coated with zinc on the steel plate to increase the corrosion resistance and is used in various fields such as automobiles.

However, the galvanizing operation for obtaining the hot-rolled hot-dip galvanized steel sheet can not be performed together with the conventional powder coating facility, and a separate operation must be performed outside the plating facility. Therefore, when the hot-dip galvanizing method is applied to a conventional powder coating facility, the overall operation speed is lowered and the manufacturing cost is increased.

Korean Patent Publication No. 10-2014-0003202 Korean Patent Publication No. 10-2003-0004018

SUMMARY OF THE INVENTION The present invention has been made to solve the problems of the prior art as described above, and it is an object of the present invention to improve the corrosion resistance of a product by applying a zinc primer to the surface of a workpiece using a conventional powder coating facility.

According to an aspect of the present invention for achieving the above-mentioned object, the present invention provides a transfer apparatus for transferring a workpiece to be loaded while being continuously moved to move along a predetermined orbit, A zinc primer device positioned in the following sequence of the shot blast on the path of the transfer device and applying a zinc paint to the workpiece to coat the surface thereof; And a heating device located in the next order of the zinc primer device on the path of the device and for heating the zinc-coated workpiece.

The zinc primer apparatus is formed by spraying a zinc paint containing an adhesive component onto the surface of the workpiece.

The shot blast apparatus, the zinc primer apparatus, and the heating apparatus are installed on a circulation path continuously extending along the conveying apparatus.

And a drying device for drying the workpiece placed in the following sequence of the heating device on the path of the transfer device and passed through the heating device.

The heating device comprises an oven for heating the workpiece.

A drying unit is provided in a work space between a pair of air curtains forming an inlet and an outlet, respectively, and the drying unit is provided with a dust collecting device and a secondary heating device continuously.

The transfer device is provided with a plurality of path switching devices, and the path switching device changes the transfer direction of the workpiece to reduce the entire installation area of the transfer device.

According to another aspect of the present invention, there is provided a method of manufacturing a workpiece comprising a loading step in which a plurality of workpieces are juxtaposed in one hanger, a washing step in which the surfaces of the plurality of workpieces are cleaned by a shot blast apparatus, A zinc primer step of applying a zinc primer to the surface of the zinc primer coating the surface of the zinc primer coating the surface of the zinc primer, Wherein the loading and unloading steps are consecutively performed along a transfer device forming a circulation path.

Wherein the zinc primer device is formed by spraying a zinc paint containing an adhesive component onto the surface of the workpiece to coat the workpiece and drying the workpiece by a drying device positioned in the following sequence on the path of the transfer device Drying step is further included.

The zinc primer powder coating system and the powder coating method using the zinc primer powder coating system according to the present invention as described above have the following effects.

In the present invention, since the zinc material is coated on the surface of the workpiece to obtain a corrosion resistance similar to that of the hot-dip galvanized steel sheet, and the coating operation is performed using zinc primer without a separate plating process, There is an effect to be improved.

Particularly, in the present invention, the zinc primer coating process can use the conventional powder coating equipment as it is, so that the productivity can be improved and the manufacturing cost can be reduced, so that the economical effect can be obtained.

Further, in the present invention, all the operations including the application of the zinc primer are continuously performed along the conveying device installed on the circulation path, so that the operation speed can be further increased. Since the circulation path is arranged to be changed in direction through the path switching device Reducing the footprint can increase space utilization.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view showing a schematic configuration of an embodiment of a zinc primer powder coating system according to the present invention. FIG.
BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a zinc primer device, and more particularly to a zinc primer device.
3 is a flowchart showing an embodiment of a powder coating method according to the present invention.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference symbols as possible even if they are shown in different drawings. In the following description of the embodiments of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the understanding why the present invention is not intended to be interpreted.

In describing the components of the embodiment of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected or connected to the other component, Quot; may be "connected," "coupled," or "connected. &Quot;

The present invention relates to a zinc primer powder coating system for coating a surface of a workpiece and a powder coating method using the zinc primer powder coating system, and various objects to be painted (hereinafter, referred to as "workpiece") are available Do. Hereinafter, the workpiece will be described as an example of a guard rail made of metal which is formed in a long direction in one direction.

As shown in FIG. 1, the workpiece moves along the transfer device 10 forming the circulation path. As shown schematically, the workpiece is loaded, surface-treated, applied, dried, . The loading means that the workpiece is fixed to the transfer device 10 so that the workpiece can be moved by the transfer device 10. Unloading means that the workpiece is transferred from the transfer device 10 Means to separate and load.

First, the transfer device 10 forms a circulation path in which a kind of process is not disconnected so that the workpiece can be continuously moved. The conveying unit 10 is provided with a conveying chain (not shown) that moves along the guide rail, and the conveying chain is rotated along the path of the conveying unit 10 by the driving force of the conveying driving source 110.

The transport chain is spaced a predetermined height from the ground, so that the workpiece is also transported away from the ground. The conveyance chain can be continuously rotated along the circulation path of the conveying device 10. [ The transfer device 10 includes a transfer chain and a hanger (not shown) connected to the transfer chain for hitting and fixing the workpiece. An unloading operation for loading or unloading the workpiece to / from the hanger Unloading apparatus 100 will be described below.

At this time, a plurality of workpieces may be connected to each other in the gravity direction. That is, since the work is performed while the plurality of workpieces are moved together along the transfer device 10 while being connected to each other, the overall operation speed can be improved. The number of the workpieces to be connected to each other need not be limited.

The workpiece can be loaded on the transfer device 10 by the loading / unloading device 100 or conversely can be separated from the transfer device 10. The loading / unloading apparatus 100 includes a loading / unloading apparatus 100, a loading / unloading apparatus 100, and a loading / unloading apparatus 100. The loading / unloading apparatus 100 includes a loading / unloading apparatus 100, An automatic lifting device may be applied or manual loading may be performed by an operator.

In contrast, the unloading device 160 'is disposed behind the loading device 160, and the operation of separating the workpiece having completed the series of surface treatment-coating-drying operations from the transfer device 10 . To this end, the unloading device 160 'is also provided with lifting means (not shown) so that the workpiece can be automatically lifted and lowered. Of course, the unloading operation can also be done manually by the operator.

At this time, the loading device 160 and the unloading device 160 'allow unloading of the workpiece while reciprocating along a predetermined section on the transfer device 10. That is, the loading device 160 and the unloading device 160 'reciprocate at a speed synchronized with the conveying speed of the conveying device 10. So that the loading and unloading of the workpiece can be performed in a process of continuously operating the transfer device 10 without stopping. Of course, the loading device 160 and the unloading device 160 'may be composed of a single unit, and may be loaded and unloaded using one moving unit (moving truck). In this case, lifting means to be described later may be installed on one moving truck, respectively.

The loading / unloading apparatus 100 is installed on the outermost side in the path of the transferring apparatus 10. This is to make it easier for the work to be carried out of the loading / unloading apparatus 100 to be taken out or taken in from the outside during the work of the loading / unloading apparatus 100.

Of course, as described above, the loading device 160 and the unloading device 160 'do not move, and the loading / unloading operation of the workpiece is performed by the operator in a fixed state, The loading and unloading may be manually performed in a certain area without using the unloading device 160 or the unloading device 160 '.

A shot blast device 150 is installed at a location adjacent to the loading / unloading device 100. The shot blast device 150 is located on the path of the transfer device 10 and serves to clean the surfaces of the plurality of workpieces. The shot blast device 150 is a device that automatically rotates the surface of a workpiece by centrifugal force by rotating fine metal or non-metal particles at a high speed to project it on a casting (workpiece) By using such a shot blast device 150, the surface cleaning operation can be completed in a time that is one-tenth of that of the existing sand blast.

When the surface of the workpiece is processed by the shot blasting device 150, the quality of the coating operation of the zinc paint in the next process can be improved, and even if the plated workpieces are already processed by the shot blast device 150 When the surface treatment is carried out, the re-coating (coating) work can be easily performed. In addition, in the present invention, since the surface treatment is performed by the shot blast device 150, environmental pollution due to wastewater or the like generated when using a flushing medicine can be reduced.

In this embodiment, a first path switching device 300A is provided between the loading / unloading device 100 and the shot blasting device 150. [ The first path switching device 300A serves to reduce the entire installation area of the conveying device 10 by changing the conveying direction of the work. In this embodiment, the first to fifth path switching devices 300A to 300E are provided so that the moving direction of the workpiece is changed five times in total. By using such a path switching device, the conveyance path of the workpiece can be optimized, and as a result, the installation area for installing the zinc primer powder coating system according to the present invention can be efficiently managed.

The second path switching device 300B is installed adjacent to the shot blast device 150 and the path of the transfer device 10 whose moving direction is changed through the second path switching device 300B is connected to the zinc primer device 200 Is installed. The zinc primer device 200 is positioned in the following sequence of the shot blasting device 150 on the path of the transfer device 10 and serves to coat the surface of the workpiece with a zinc coating material. The zinc primer device 200 performs a coating operation by spraying a zinc paint containing an adhesive component onto the surface of the workpiece. Such an operation may be performed by applying electrostatic attraction to the surface of the workpiece and applying the paint thereto.

The paint sprayed by the zinc primer device 200 has a zinc component, and an adhesive component is contained therein, thereby forming a zinc coating layer having a predetermined thickness or more on the surface of the workpiece. The zinc coating layer having a zinc component forms a large amount of heat-resistant zinc-plated coating on the coating portion of the workpiece, thereby providing anti-rust and anti-corrosion effects. Particularly, it has an excellent sound-proofing ability even in a severe environment where salinity is high or is likely to be corroded, and is capable of uniform spraying with high-purity fine-particle zinc powder, and is excellent in anti-rusting and adhesive properties.

For reference, the workpiece in this embodiment is a hot-rolled steel plate (HR). The hot-rolled steel sheet will be rolled to a high temperature of about 800 ° C or higher. Of course, the workpiece is not necessarily limited to the hot-rolled steel sheet.

A heating device 420 is installed on the path of the transfer device 10 following the zinc primer device 200. The heating device 420 is for heating the zinc-coated workpiece, and the heating device 420 heats the zinc-coated workpiece to cure the zinc coating layer on the surface to form a coating film . The heating device 420 may be an oven or a thermosetting furnace. In this embodiment, the heating device 420 is an oven. The heating device 420 heats the surface of the workpiece to a high temperature of 140 ° C within about 3 minutes to cure the zinc coating layer.

When the workpiece passed through the heating device 420 passes through the third path switching device 300C and changes its direction, drying is performed through the drying unit. Here, the drying unit is installed on the path of the transfer device 10, and reheats and dries the outer surface of the workpiece. The drying unit may again include the dust collecting device 430 and the secondary heating device 450 . As described below, in the present embodiment, the dust collecting apparatus 430 is described as a part of the drying unit. However, the dust collecting apparatus 430 may be configured separately from the drying unit. For example, the dust collecting device 430 may be provided between the zinc primer device 200 and the drying device 420, or may be a part of the zinc primer device 200.

The dust collecting device 430 sucks and discharges dust generated during the application work of the zinc primer device 200 and includes a plurality of filters and a duct collecting the paint sucked through the filter. The filter serves to filter out impurities while sucking the paint in a state where a large number of air vents corresponding to the particle size of the paint are formed on raw materials such as fabrics, nonwoven fabrics, synthetic resins, etc., and the duct is provided with an external suction fan Can be connected.

The secondary heater 450 provided at one side of the dust collecting apparatus 430 is provided with a plurality of heaters to heat and dissolve the coating material applied to the workpiece to form a coated film. The heater is a type of electric heater that emits light, heat, and far-infrared rays through a carbon coil. The workpiece primarily dried in the heating device 420 can be completely dried through the secondary heating device 450.

Air curtain devices 480 and 480 'are installed at the entrance and exit of the drying unit, respectively. The air curtain devices 480 and 480 'eject compressed air to the inlet and the outlet of the drying unit to prevent the paint from being discharged to the outside of the drying unit and to maintain the temperature inside the drying unit. That is, the air curtain device forms an air film to maintain the temperature and humidity inside the drying unit.

Hereinafter, a powder coating method according to the present invention will be described.

First, a loading step in which a plurality of workpieces are juxtaposed to one hanger is precedently performed by the loading device 160 (S100). This results in multiple workpieces hanging side by side on the hanger. Since the loading device 160 can be moved synchronously with the transfer device 10, loading of the workpiece can be performed without stopping the transfer device 10. The loading device 160 is provided with lifting means, so that the worker can easily hang the workpiece on the hanger of the transfer device 10. The loading step may be performed while the loading device 160 moves in the direction of arrow 1 in FIG.

When a plurality of workpieces are loaded, the workpieces are cleaned by the shot blast device 150 while moving along the transfer device 10 (S110). When the surface of the workpiece is processed, the quality of the coating operation of the zinc paint in the subsequent process can be improved. Even if the coated workpiece is subjected to the surface treatment by the shot blast device 150, (Coating) work can be easily performed. In addition, in the present invention, since the surface treatment is performed by the shot blast device 150, environmental pollution due to wastewater or the like generated when using a flushing medicine can be reduced. This step can be seen in the direction of arrow 2 in Fig.

After the workpiece is subjected to the surface treatment by the shot blast device 150, the workpiece moves along the transfer device 10 and the zinc primer is applied to the surface by the zinc primer device 200 (S120). The paint sprayed by the zinc primer device 200 has a zinc component, and an adhesive component is contained therein, thereby forming a zinc coating layer having a predetermined thickness or more on the surface of the workpiece. The zinc coating layer having a zinc component forms a large amount of heat-resistant zinc-plated coating on the coating portion of the workpiece, thereby providing anti-rust and anti-corrosion effects. This step can be seen in the direction of arrow ③ in Fig.

The workpiece is dried to some extent in the process of moving along the transfer device 10 (S130), and the heating process is continued by the heater 420 (S140). The heating step is performed while the workpiece is passed through the heating device 420. The heating device 420 is composed of an oven so that high temperature is applied to the surface of the workpiece for curing. As a result, the zinc coating layer applied on the surface of the workpiece is cured to form a coating film.

Then, the workpiece continues to move along the transfer device 10 and passes through the drying unit. When the workpiece passes through the drying unit, the dust generated during the coating operation is sucked and discharged by the dust collector 430. At this time, the paint sucked through the filter provided in the dust collector 430 is collected in the duct. The duct may be connected to an external suction fan for suction of the paint. This step can be seen in the direction of arrow ④ in FIG.

In the secondary heating unit 450 included in the drying unit, a plurality of heaters are installed inside, and the paint applied to the work is dried and completely cured. Of course, the secondary heating may be omitted. This step can be seen in the direction of arrow 5 in Fig.

Finally, an unloading step is performed in which a plurality of workpieces are separated from the hanger by the unloading device 160 'of the loading / unloading device 100 (S150). The workpiece is separated from the transfer device 10 by the unloading device 160 ', and is taken out to the outside because the work is formed with the zinc coating layer formed on the surface through the previous process. This step can be seen in the direction of the arrow ⑥ in FIG.

In the present invention, the loading step and the unloading step are continuously performed along the conveying device 10 forming the circulation path, thereby enabling a fast operation speed. Further, by installing the zinc primer device 200, have.

In addition, by applying the zinc material to the surface of the workpiece through the above process, it is possible to obtain effects such as corrosion resistance similar to that of the hot-dip galvanized steel sheet, and the coating operation can be performed using a zinc primer without a separate plating process have. That is, it is not necessary to take the workpiece out of the plating facility for carrying out the zinc plating and carry it in again, so that the zinc primer powder coating system according to the present invention can perform all operations in a batch and continuous manner .

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiments, it is to be understood that the invention is not limited to the disclosed embodiments. That is, within the scope of the present invention, all of the components may be selectively coupled to one or more of them. Furthermore, the terms "comprises", "comprising", or "having" described above mean that a component can be implanted unless otherwise specifically stated, But should be construed as including other elements. All terms, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined. Commonly used terms, such as predefined terms, should be interpreted to be consistent with the contextual meanings of the related art, and are not to be construed as ideal or overly formal, unless expressly defined to the contrary.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the scope of the present invention but to limit the scope of the technical idea of the present invention. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

For example, in the above embodiment, either the dust collecting device 420 or the secondary heating device 450 may be omitted.

10: Feeding device 100: Loading / unloading device
150: shot blast device 160: loading device
160 ': unloading device 200: zinc primer device
420: Heating device 430: Dust collector
450: Secondary heating device

Claims (9)

A transfer device for transferring the loaded workpiece while continuously operating to move along a predetermined trajectory;
A shot blast device positioned on a path of the transfer device for cleaning the surfaces of the plurality of workpieces;
A zinc primer device positioned in the following sequence of the shot blast on the path of the transfer device and applying a zinc paint to the workpiece to coat the surface thereof;
And a heating device for heating the zinc-coated workpiece in the following sequence of the zinc primer device on the path of the transfer device.
The zinc primer powder coating system according to claim 1, wherein the zinc primer device is a zinc primer powder coating system for spraying a zinc coating containing an adhesive component onto the surface of the workpiece for coating.
The zinc primer powder coating system according to claim 1, wherein the shot blasting device, the zinc primer device, and the heating device are installed on a circulation path continuously extending along the conveying device.
The zinc primer powder coating system according to claim 1, further comprising a drying device positioned in the following sequence of the heating device on the path of the transfer device and drying the workpiece passed through the heating device.
The zinc primer powder coating system according to claim 1, wherein the heating device comprises an oven for heating the workpiece.
6. The powder coating system according to claim 5, wherein a drying unit is provided in a working space between a pair of air curtains forming an inlet and an outlet, respectively, and the drying unit is provided with a dust collecting device and a secondary heating device continuously .
The apparatus according to any one of claims 1 to 6, wherein the conveying device is provided with a plurality of path switching devices, and the path switching device is configured to change the conveying direction of the workpiece to reduce the total installation area of the conveying device, Primer powder coating system.
A loading step in which a plurality of workpieces are juxtaposed in one hanger,
A cleaning step in which the surfaces of the plurality of workpieces are cleaned by a shot blast apparatus,
A zinc primer step in which a surface of the workpiece is coated with a zinc coating material by a zinc primer apparatus,
A heating step in which the surface of the workpiece is cured while passing through the heating device following the zinc primer step,
Comprising a unloading step in which a plurality of workpieces are separated from the hangers,
Wherein the loading step and the unloading step are continuously performed along a transfer device forming a circulation path.
The zinc primer apparatus according to claim 8, wherein the zinc primer apparatus is a zinc primer apparatus for spraying a zinc paint containing an adhesive component onto a surface of the workpiece to coat the zinc coating material on the surface of the workpiece, Wherein the drying step further comprises drying the workpiece.

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