KR100863012B1 - Infrared ray heating apparatus for electrostatic spray coating of power paint - Google Patents

Abstract

An infrared ray heating system for electrostatic spray coating is provided to enable efficient heating and melt curing of a spray coated film formed on an article to be coated, thereby improving the production efficiency and product quality. An infrared ray heating system for electrostatic spray coating comprises: an electrostatic spray coating unit(100) for carrying out spray coating of a powder coating agent on the surface of an article(10) to be coated; an IR heating unit(200) that includes a body(210) to which the article coated in the electrostatic spray coating unit is fed continuously, wherein the body has a chamber-like shape and an inlet(211) through which the article is fed, and the region adjacent to the inlet is inclined downwardly, IR heaters having a flat panel shape and surface irregularities, disposed on the inner wall of the body and emitting infrared rays to the article, thereby heating, melting and curing the powder coating agent on the surface of the article, and an IR reflection plate formed on the inner wall of the body between the IR heaters for reflecting the IR rays emitted from the IR heaters; and a conveying unit(300) for continuously conveying the article into the electrostatic spray coating unit and IR heating unit.

Description

Infrared Ray Heating Apparatus for Electrostatic Spray Coating of Power Paint}

1-a perspective view of the main part of the infrared heating device for powder electrostatic coating according to the present invention.

Figure 2-front view of the body of the infrared heating unit for powder electrostatic coating according to the present invention.

Figure 3 is a front view of another embodiment of the body of the infrared heating unit for powder electrostatic coating according to the present invention.

<Description of Major Symbols Used in Drawings>

10: coating 100: powder electrostatic coating

110: main body 111: transfer path

120: doorway 130: intake and exhaust

200: infrared heater 210: body

211: supply port 220: infrared heater

230: infrared reflector 240: vertical bulkhead

250: high power heating unit 260: cooling unit

270: double-sided radiation infrared heater 300: transfer unit

310: Balance

The present invention relates to an infrared heating device for powder electrostatic coating, and in particular, the powder electrostatic coating and the infrared heating are continuously formed to perform efficient heat melt curing of the powder coating film formed on the object to improve production efficiency and quality. An object of the present invention is to provide an infrared heating device for powder electrostatic coating.

In general, infrared ray (IR) is electromagnetic wave, so it has straightness, reflectivity, transmissivity, absorbency, etc. Unlike conventional conduction or heat transfer methods such as convection, it is transmitted to the object to be heated as a light beam and absorbed directly without any intermediate medium. Since it is converted into heat, it has a feature of heating the heated object rapidly and uniformly.

Therefore, when infrared is used as a heating source, the energy efficiency is high, and the heated object can be uniformly heated rather than conduction or convection heating, thereby enabling mass production of high quality products. In particular, the importance of the heating technology in the powder coating process is expanding, most of the powder coatings to be coated on the coating are synthetic polymers are not good thermal conductivity, so it is confirmed that the excellent infrared ray irradiation shows excellent heating characteristics.

However, ceramics or carbon black bodies are mainly used as a radiator material for using infrared rays as a heating source, and it is difficult to mass-produce far infrared rays with a high energy density of 4.5-15 μm wavelength band having excellent absorption efficiency to synthetic polymers. There is a point.

In addition, halogen lamps, sheath heaters coated with infrared radiation materials, ceramic sintered tubes, and ceramic sintered radiators with resistance heating wires are commercially available as infrared heating sources. It is difficult to control the direction of the radiation wave because it has a high near-infrared radiation fraction and the surface of the radiator is round pipe type because it is high temperature above ℃. Therefore, it is difficult to apply the heat insulator. Was not possible.

As a conventional technique for solving such a problem, a number of patents have been applied for a thermal panel for bioactivity and heating of a large area far infrared radiator. Korean Patent Application Publication No. 1998-062687 discloses an ondol panel that emits far-infrared rays, and a plurality of panels made of ceramics for far-infrared radiation are used on top of a metal plate such as aluminum, iron plate, or copper plate. And a far-infrared radiation ceramic temperature panel that can be used as a mattress or the like of a stone bed bottom by forming a ceramic ondol plywood.

In addition, Korean Utility Model Registration No. 0152249 relates to a far-infrared dryer for coating and heating a predetermined radiating material on a planar heating element, and mixing polycrystalline tin, ceramic, quartz glass and tempered glass to solidify it into a plate to make a planar body. It is difficult to manufacture with high power large area infrared heater because the surface heating element is heavy and weak against thermal shock.

In particular, the powder electrostatic coating is an environmentally friendly coating process and excellent coating strength, but its application is expanding, but the powder coating film forming the surface of the coating material is made of a synthetic polymer, which is difficult to melt and harden due to poor thermal conductivity.

In addition, the hot air convection method is mainly used for the heat-melting and curing of the powder coating film, which is poor in heat transfer characteristics, so that the equipment scale and energy consumption are large, the productivity is low, and the uniform heating is difficult. It has a disadvantage of poor heating quality due to poor smoothness and adhesion.

The present invention has been made to solve the above problems, the powder electrostatic coating and the infrared heating unit is continuously formed to perform efficient heat melt curing of the powder coating film formed on the coating powder electrostatic power to improve the production efficiency and quality An object of the present invention is to provide an infrared heating device for painting.

The present invention for achieving the object as described above, the powder electrostatic coating for electrostatic coating the powder coating on the surface of the workpiece; An infrared heating unit for continuously coating and transferring the coated object from the powder electrostatic coating unit, and forming a flat plate infrared heater on the inner wall to heat-melt and dry the powder coating on the surface of the coated object; Technical object of the present invention is to provide an infrared heating device for powder electrostatic painting, comprising: a transfer unit for continuously transferring the object inside the powder electrostatic coating unit and the infrared heating unit.

In addition, the powder electrostatic coating, the main body is formed on the lower side of the transfer portion, the transfer passage is formed on the upper surface; An entrance and exit formed on both sides of the main body and in communication with the transfer passage of the main body to allow the object to enter and exit; It is preferable to include a; the intake and exhaust mechanism formed on the upper body.

The infrared heating unit may include: a body formed in a chamber shape and having a supply port for supplying a workpiece to one side; An infrared heater formed in a flat plate shape and installed on the inner wall of the body to emit infrared rays; And an infrared reflector formed on the inner wall of the body between the infrared heaters and reflecting infrared rays emitted from the infrared heaters.

In addition, the infrared heating unit, it is preferable that the supply port adjacent portion of the body is inclined downward, it is preferable that the vertical partition wall separating the inside of the body into a high output heating portion and the cooling portion is formed adjacent to the supply port of the body. .

In addition, the infrared heating unit, a double-sided radiation infrared heater is installed in the inner center of the body, the object is passed through the high-power heating unit of the body is returned to the U-shaped in the interior of the body is preferably transferred to the cooling unit of the last stage. .

Here, the transfer unit for transferring the object to the inside of the infrared heating portion, it is possible to seat a plurality of the object on the upper surface, it is preferable to be formed as a bogie to reciprocate in the infrared heating portion.

Accordingly, it is possible to continuously carry out the heat-melt curing and cooling of the powder coating film formed on the object by far-infrared radiation heating, so that the heat transfer characteristic to the powder coating film made of synthetic polymer is excellent, and the equipment scale and energy efficiency are high. Productivity is high and there is an advantage of improving the quality of the product through uniform heating.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in detail. 1 is a perspective view of a main part of an infrared heating device for powder electrostatic coating according to the present invention, Figure 2 is a front view of the body of the infrared heating unit for powder electrostatic coating according to the present invention, Figure 3 is a powder electrostatic according to the present invention Front view of another embodiment of the body of the infrared heating for painting.

As shown, the present invention is largely composed of the powder electrostatic coating unit 100, the infrared heating unit 200 and the transfer unit 300, the coating material introduced into the powder electrostatic coating unit 100 by the transfer unit 300 (10) ) Is coated on the surface of the powder electrostatic coating to form a powder coating film, the coating film formed with the powder coating 10 is introduced into the infrared heating unit 200 by the transfer unit 300, the powder coating film is heated by infrared light By melting and completing the coating 10 having the powder coating film excellent in the smoothness and adhesion of the coating film, all the processes are performed continuously and quickly.

First, the powder electrostatic coating unit 100 will be described.

The powder electrostatic coating unit 100 is operated similar to the principle of the conventional powder electrostatic coating apparatus, and when spraying compressed air while applying a high voltage power to the object 10, the powder coating is opposite to the object 10. It becomes floating while having a charge of, and the coating material 10 having a polarity opposite to the particles of the powder coating attracts the powder coating with a strong suction force, so that the powder coating is painted thick and evenly on the surface of the object to form a powder coating film. .

The powder electrostatic coating unit 100 according to the present invention operates similarly to the principle of the above general powder electrostatic coating apparatus, and the powder electrostatic coating unit 100 has a main body 110 having a conveying passage 111 formed on an upper surface thereof. Is formed on both sides of the main body 110 and communicates with the conveying passage 111 of the main body 110 is formed in the entrance 120 is formed so that the object 10 is entered and the intake and exhaust mechanism 130 formed on the upper body 110 Is done.

As a result, the coating 10 is introduced into the entrance 120 of the powder electrostatic coating unit 100 by the transfer unit 300 to be described later, and transferred to the interior of the powder electrostatic coating unit 100. It is coated on (10), which is again to be withdrawn through the entrance 120 of the powder electrostatic coating unit 100 through the transfer unit 300. Here, the workpiece 10 carried by the transfer unit 300 is drawn out through the entrance 120 while being moved along the transfer passage 111 formed on the upper surface of the main body 110 of the powder electrostatic coating unit 100. Will be.

Next, the infrared heating unit 200 is supplied with the coating object 10 coated on the powder electrostatic coating unit 100 is continuously transported, the inner wall surface is formed with a plate-shaped infrared heater 220 to be coated (10) The powder coating on the surface is heated to melt and harden. As a result, the coating 10 having the powder coating film is transported into the infrared heating unit 200 by the transfer unit 300, and heats, melts, and hardens the powder coating by far infrared rays emitted by the infrared heater 220. Thus, a product having a uniform coating film is completed.

The infrared heater 220 is easy to control the infrared radiation direction, it is easy to apply a heat insulating material and the like, it is preferable to be formed in a flat plate having excellent infrared radiation efficiency, and also the characteristics of the coating material (10) and powder coating In consideration of the above, the infrared heating part 200 may be formed on the lower side and both sides or selectively.

One or both surfaces of the infrared heater 220 is coated with an infrared radiation material to further increase the far infrared radiation efficiency. As the infrared radiation material, surface treatment of iodine, cerite, cordierite, germanium, iron oxide, mica, manganese dioxide, silicon carbide, macsumite, carbon-based inorganic spinning material, and colloidal silica dispersed in water with organic silane It is composed of a hybrid binder material. It can be used to select any one or a mixture thereof in consideration of the characteristics of the coating material 10 and the powder coating, and in general, since the powder coating is composed of synthetic polymers, an organic-inorganic hybrid spinning material having excellent far-infrared radiation efficiency is used. It is desirable to.

In addition, the infrared heating unit 200 is generally formed in a long chamber shape in the longitudinal direction, the body 210 is formed with a supply port 211 is supplied to the workpiece 10 on one side, and in the body 210 The wall is composed of an infrared heater 220 for emitting infrared rays, and an infrared reflector 230 for emitting infrared rays emitted from the infrared heater 220.

That is, the coating object 10 supplies and transports the coating material 10 on which the powder coating film is formed through the transfer part 300 to the body 210 supply port 211 of the infrared heating part 200, and the infrared heater 220. By heating the coating (10) by the operation of) to melt and sequentially harden the powder coating film formed on the coating (10) to be uniformly and firmly fixed. In addition, the infrared heater 220 is basically formed on one side of the body 210, the exhaust device for exhausting the exhaust gas 212 and the circulation duct 213 for circulating the heat therein is formed.

Here, the body 210 of the infrared heating unit 200 is formed so that the adjacent portion of the supply port 211 is inclined downward, to minimize the energy loss due to natural convection. In addition, it is preferable to form a vertical partition wall 240 that separates the inside of the body 210 into the high power heating unit 250 and the cooling unit 260 in the vicinity of the supply port 211 of the body 210.

The high power heating unit 250 separated by the vertical partition wall 240 is a place where the coated object 10 having the powder coating film is transported from the powder electrostatic coating unit 100 and drawn therein is an inlet of the body 210. In the supply port 211 is a place for increasing the speed of heating and melting of powder coating by spinning with high power. In addition, the cooling unit 260 is the body 210 before the object 10 is passed through the interior of the body 210 and heated and melted by the infrared heater 220 before being drawn out of the body 210. In a position adjacent to the supply port 211, the low-power or zero-output is a place where the heated workpiece 10 is naturally cooled. The high power heating unit 250 and the cooling unit 260 to control the output by adjusting the output of the infrared heater 220 formed on the inner wall surface of the body (210).

In addition, the infrared heater 220 is formed on the inner wall surface of the body 210 in consideration of the characteristics of the coating material 10 and the powder coating, the capacity of the infrared heater 220, the heating temperature of the heating space, the unit price, etc. It can be formed by adjusting.

The infrared heater 220 is a high temperature (50 ~ 500 ℃) as a plate heater (heating source: metal resistance wire or coated conductive heating paint insulated with a mica sheet) or panel heater (heating source: sheath heater) using a metal material as a base material Heat cycle up to is required to maintain the shape of the heater structure and maintain electrical insulation, high-efficiency infrared radiator with excellent adhesion and thermal shock is to coat the surface of the infrared heater 220 by the spray method.

In addition, in order to further increase the radiation efficiency, the base material surface may be coated with the spinning material after forming a fine concave-convex structure. The heating heater for infrared radiation is an electric resistance heating method, and heat transfer is possible only in one direction even under high temperature conditions, and the opposite side may be formed by heat insulation or surface treatment of the back surface having low infrared emissivity. However, if necessary, it is also possible to implement a double-sided radiation infrared heater 270, which is located in the center of the body 210 so that the object 10 is exposed to the second infrared ray, heating, melting and curing of the powder coating film It can be made more uniform and solid.

Herein, the infrared rays emitted by the infrared heater 220 are effectively absorbed by the presence or absence of machine materials or water to generate heat through vibration excitation of the constituent molecules. In particular, the far infrared rays penetrate deeply into the material and are absorbed. (10) has the advantage of rapid and uniform heating. In particular, according to the present invention, the distribution of the far infrared wavelength (4.5 ~ 15㎛) band by the plate-shaped wide infrared heater 220 is high as 75% or more, high output radiation (radiator surface temperature 500 ℃ or more) is possible and the radiation wave It is easy to control the direction, thereby effectively heat-melting and curing the polymer powder coating film having poor thermal conductivity.

The infrared heating unit 200 has the double-sided radiation infrared heater 270 is installed in the inner center of the body 210, the object 10 passes through the high power heating unit 250 of the body 210 to the body The inside of the 210 is returned to the U-shape and is transferred to the cooling unit 260 of the last stage so that the time for which the object 10 is exposed to the infrared heater 220 is longer than necessary to extend the length of the body 210. It is not to be long.

Next, the transfer part 300 is installed above the powder electrostatic coating part 100 so that the workpiece 10 is transported into the powder electrostatic coating part 100 through the transfer passage 111 to be electrostatically coated with powder. After that, it is to be continuously transported into the body 210 of the infrared heating unit 200.

In this case, the transfer part 300 is to be transferred to the object 10 automatically along the rail by a hoist through the powder electrostatic coating unit 100, the body 110 inside the infrared ray as shown in Figure 2 Continuously formed so as to pass through the inside of the body 210 of the heating unit 200, or as shown in Figure 3 the electrostatic coating portion 100, as needed, the workpiece 10 along the rail by a hoist To be transported, the body 210 may be carried on the workpiece 10 by the trolley 310 to be transported. When the workpiece 10 is transported by the cart 310, the plurality of workpieces 10 may be seated and transported at the same time according to the size of the workpiece 10.

 Accordingly, the powder electrostatic coating unit 100 electrostatically induces the polymer powder coating to form a powder coating film on the coating object 10, and subsequently transports the coating material 10 to the infrared heating unit 200 to polymer powder By heating and melting the paint, the polymer powder paint is adhered to the surface of the coating 10, and at the same time, the film formation between the polymer powder paints and the homogenization of the coating film surface occur. This is because the electromagnetic wave absorption heating method by the infrared irradiation, the coating 10 has a uniform uniform heating, melting, curing, etc., has advantages in productivity, energy saving, heating quality and the like. In particular, the thermal sensitivity is excellent, it is easy to control and the device efficiency is greatly improved.

According to the present invention by the above configuration, it is possible to continuously carry out the heating, melting, curing and cooling of the powder coating film formed on the object by far-infrared radiation heating, polymer powder coating having a poor thermal conductivity absorbs far infrared rays, self-heating It has rapid uniform heating, melting, and hardening, so it has advantages in productivity, energy saving, heating quality, etc., adhesion to the base material surface, coating film formation between polymer powder coatings, and homogeneous coating surface It has the effect of causing it to happen. In particular, the thermal sensitivity is excellent, so the temperature control is easy and the device efficiency is greatly improved.

In addition, the infrared heating unit is formed in a chamber shape as a whole, and a plate-type infrared heater is formed on the inner wall surface, so that it is possible to fix the coated object having various sizes and shapes therein or to continuously transfer it, thereby having excellent applicability.

Claims (7)

A powder electrostatic coating unit 100 for electrostatically coating powder coating on the surface of the workpiece 10; The coated object 10 coated by the powder electrostatic coating part 100 is continuously transferred and supplied, and is formed in a chamber shape so that a supply port 211 is formed to supply the coated object 10 to one side, and the supply port 211 is provided. Body 210 and the adjacent portion formed to be inclined downward, is formed in a flat plate shape, has a concave-convex structure on the surface, is installed on the inner wall surface of the body 210 to emit infrared radiation to heat the powder coating on the surface of the workpiece 10 An infrared heater 220 for melting and curing, and an infrared reflector 230 formed between the infrared heater 220 on the inner wall surface of the body 210, reflecting the infrared radiation emitted from the infrared heater 220 An infrared heating unit 200; Infrared heating device for powder electrostatic coating, characterized in that it comprises a; the powder electrostatic coating unit 100 and the infrared heating unit 200, the transfer unit 300 for continuously transferring the object (10) inside. According to claim 1, wherein the powder electrostatic coating portion 100, A main body 110 formed below the transfer part 300 and having a transfer path 111 formed on an upper surface thereof; An entrance (120) formed at both sides of the main body (110) and in communication with the transfer passage (111) of the main body (110) to allow the object (10) to enter and exit; Infrared heating device for powder electrostatic coating, characterized in that comprises ;; delete delete The method of claim 2, wherein the infrared heating unit 200, Powder electrostatic coating, characterized in that the vertical partition wall 240 for separating the inside of the body 210 into the high output heating unit 250 and the cooling unit 260 adjacent to the supply port 211 of the body 210 is formed. Infrared heater. The method of claim 5, wherein the infrared heating unit 200, Double-sided radiation infrared heater 270 is installed in the inner center of the body 210, the workpiece 10 passes through the high power heating unit 250 of the body 210 in a U-shape in the interior of the body 210 Infrared heating device for powder electrostatic coating, characterized in that returned to the cooling unit 260 is returned. According to any one of claims 1 and 2 and 5 to 6, The transfer unit 300 for transferring the object 10 into the infrared heating unit 200, An infrared heating device for powder electrostatic coating, which can be mounted on a plurality of workpieces (10) on the upper surface, and formed of a trolley (310) reciprocating in the infrared heating unit (200).

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