KR20090060868A

KR20090060868A - Powdered paint spraying system for vehicle body painting process

Info

Publication number: KR20090060868A
Application number: KR1020070127830A
Authority: KR
Inventors: 김민수
Original assignee: 현대자동차주식회사
Priority date: 2007-12-10
Filing date: 2007-12-10
Publication date: 2009-06-15

Abstract

An apparatus for applying powder paint on a vehicle coating line is provided to control the injection amount of the powder paint by controlling supply quantity of the air delivering the powder paint automatically according to thickness of a film. An apparatus(100) for applying powder paint on a vehicle coating line comprises the followings: a painting portion(10); a plurality of spray units(20) spraying the powder paint, and installed at the painting portion; an air supplying unit(30) supplying the air into the spray units; a powder paint supply unit(40) supplying the powder paint with air; a film measuring unit(50) outputting measured data with a controller; and air control unit(60) controlling amount of the air supplied from the powder paint supply unit.

Description

Powder coating system for automobile coating line {POWDERED PAINT SPRAYING SYSTEM FOR VEHICLE BODY PAINTING PROCESS}

Exemplary embodiments of the present invention relate to a powder coating apparatus for an automobile coating line, and more particularly, to a powder coating apparatus for an automobile coating line to automatically adjust the injection amount of the powder coating.

In general, in the production line of automobiles, the painting process is to prevent corrosion of the vehicle body after completion of the vehicle body, and to enhance the merchandise by making the beauty of the sound with sound insulation.

In the coating line to which the coating process is applied, the electrodeposition (subsurface) process, which is a factor of rust prevention and surface gloss of the car body passing through the drying furnace of the pretreatment process, and after applying the sealer, the chipping resistance, smoothness, weather resistance, etc. of the paint are applied. The coating film is formed on the vehicle body through the intermediate process, the top coat process, the clear process, and the like, which provide the glossiness.

In such a painting line, in particular, in a medium-sized process, a vehicle body coating system is provided for applying a coating to a vehicle body. The vehicle body coating system, for example, sprays a liquid coating onto a vehicle body, and a liquid coating material not attached to the vehicle body. Mist is rinsed as circulating water, and it consists of a structure which sludge-processes the wash water which mixed liquid paint mist and circulating water.

On the other hand, unlike the above-mentioned coating system which applies liquid paint recently, the vehicle body coating is applied by applying powder paint which does not contain volatile organic compound (VOC) as environmental problem for liquid paint is regulated by global regulations. There is a need for continuous development and application of coating systems.

The powder coating device according to an example of the prior art basically sprays the powder coating to the coating (B) as the pressure of the air inside the coating portion 101 for coating the coating (B), as shown in FIG. A plurality of spray units 102 are provided.

The plurality of spray units 102 are connected to the air supply unit 103 and the powder coating material supply unit 104, in which case the air supply unit 103 is connected to the paint portion 101.

The powder paint supply unit 104 stores the powder paint storage tank 105 for storing the powder paint, and the powder paint provided from the powder paint storage tank 105, and paints the powder paint through air. And a circulation tank 106 for storing the powder coating material returned from the coating unit 101 at the same time.

Here, the circulation tank 106 is installed to be connected to the powder coating tank 105 and the air supply unit 103. At this time, the circulation tank 106 is connected to the air supply unit 103 through the air supply line 107, which is provided with a throttle valve 108 for selectively adjusting the opening degree of the flow path. It is.

In addition, under the coating unit 101 to recover the powder coating mist (mist) flying as powder particles without being attached to the coating (B) of the powder coating sprayed from the spray units 102 powder coating unit ( 109 is configured.

The powder coating material recovery unit 109 recovers the powder coating mist falling in the gravity direction by the air supplied from the air supply unit 103 to the coating unit 101 as a stream of air, and the powder coating material supply unit ( Supply to the circulation tank 106 of 104.

Therefore, according to the powder coating device according to the prior art, when the air is supplied to the circulation tank 106 through the air supply unit 103, the powder paint stored in the powder coating tank 105 is circulated tank by the pressure of air And the powder coating material is supplied to the spray units 102 and sprayed onto the surface of the workpiece B through the spray units 102.

In this process, among the powder coatings sprayed onto the coating B, the powder coating mist, which is not attached to the coating B and is blown as powder particles, is lowered in the direction of gravity by the air supplied to the coating unit 101. Collected by the paint recovery unit 109 is recovered to the circulation tank 106 of the powder paint supply unit (104).

The powder coating device according to the related art is a hose or spray units 102 for supplying powder paint during the painting operation is blocked by the powder paint, the injection amount of the powder paint sprayed to the spray units 102 It is reduced to form a low coating film on the workpiece (B).

As described above, when a low coating film is formed on the coating B, the coating B may be discarded or reused. Therefore, the worker checks the coating failure of the coating B, and the powder coating hose Alternatively, the spray unit 102 may be dismantled and cleaned, or by manually operating a powder paint spray amount control switch (not shown) to increase the opening degree of the throttle valve 108 to increase the spray paint volume.

By the way, in the prior art, the injection amount of the powder coating on the spray units 102 is made as a manual operation, so the amount of air is fixed in one setting, so the injection amount of the powder coating is also fixed, so that the powder coating hose or spray is passed over time. Since the powder coating material is loaded in the units 102, the spraying amount of the powder coating is reduced, thereby causing a problem of forming a low coating film on the object B.

Therefore, in the related art, a low coating film is formed on the coating B as described above, resulting in an increase in the production cost due to the disposal or reuse of the coating B.

Exemplary embodiments of the present invention have been created to solve the problems as described above, by measuring the coating film of the powder coating material attached to the coating material and automatically controlling the supply amount of air to convey the powder coating material according to the coating film thickness An object of the present invention is to provide a powder coating device for an automobile paint line, by controlling the spraying amount of powder coating material on a coating material so that a powder coating film having a uniform thickness can be formed on the surface of the coating material.

Powder coating device of the automotive coating line according to an exemplary embodiment of the present invention for achieving the above object is, i) a coating unit for coating the coating, ii) the coating unit is installed in the air A plurality of spray units for spraying the powder coating material onto the workpiece as pressure; i) an air supply unit for supplying the air to the spray units; and v) a connection with the air supply unit. Powder coating unit for supplying the spray unit to the spray units, i) a coating film measuring unit for measuring the thickness of the powder coating film attached to the workpiece and outputting the measurement data to the controller, and i) measuring data of the coating film measuring unit. According to the controller to adjust the amount of air supplied from the air supply unit to the powder coating unit Comprising one unit.

In the powder coating apparatus of the automobile coating line, the air supply unit is configured to be connected to the powder coating unit through an air supply line, the air supply line has a throttle valve for selectively adjusting the opening degree of the flow path Can be installed.

In the powder coating apparatus of the automotive coating line, the powder coating unit supplies the powder coating while storing the powder coating, the powder coating storage tank storing the powder coating, and the powder coating provided from the powder coating storage tank. It may include a circulation tank for storing the powder paint returned from the coating portion at the same time as supplying to the coating portion.

In the powder coating apparatus of the automobile paint line, the air supply unit may be configured to be connected to the circulation tank through the air supply line.

In the powder coating apparatus of the automobile coating line, the circulation tank is installed to be connected to the powder coating tank through the first powder coating supply line, and to be connected to the spray units through a second powder coating supply line. Can be installed.

In the powder coating apparatus of the automobile paint line, the air amount control unit is installed to be connected to each of the drive motors corresponding to the spray units, and each of the drive motors are installed according to the rotation angle by the drive motor. It may include a dial gauge for applying a predetermined valve opening signal to the throttle valve.

According to the powder coating device of the automotive coating line according to the exemplary embodiment of the present invention as described above, the coating film of the powder coating attached to the coating object is measured through the coating film measuring unit and the powder coating material is conveyed according to the coating film thickness. It is possible to form a powder coating film having a uniform thickness on the surface of the workpiece by controlling the injection amount of the powder paint on the coating object by automatically controlling the supply amount of the air through the air amount adjusting unit.

Therefore, the powder coating apparatus of the automobile coating line according to the present embodiment can greatly contribute to the reduction of production cost due to the disposal or reuse of the coating by forming a low coating film on the coating.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

1 is a block diagram schematically showing the configuration of a powder coating apparatus for a vehicle paint line according to an exemplary embodiment of the present invention.

Referring to the drawings, the powder coating device 100 of the automotive coating line according to an exemplary embodiment of the present invention measures the coating film of the powder coating attached to the coating material, such as a car body or part parts, and powder coating according to the coating film thickness It is made as a structure that can form a powder coating film having a uniform thickness on the surface of the coating material by automatically adjusting the supply amount of the air to be pumped by controlling the injection amount of the powder coating material to the coating material.

The powder coating apparatus 100 of the automobile coating line basically includes a coating unit 10, a plurality of spray units 20, an air supply unit 30, a powder coating unit 40, and a coating film measurement. The unit 50 and the air quantity adjusting unit 60 are comprised.

In the present embodiment, the painting portion 10 forms a booth space for painting the workpiece B transferred through the conveyor (not shown).

A plurality of air spray nozzles (not shown) for supplying air provided from the air supply unit 30 to the gravity direction, that is, to the object B is provided on the upper portion of the coating part 10.

In this embodiment, the spray units 20 are for spraying the powder coating to the coating (B) to be transferred to the coating unit 10, respectively.

These spray units 20 are powder coating powder having a conventional structure capable of spraying the powder coating material supplied from the powder coating material supply unit 40 to the coating object B as the pressure of the air supplied from the air supply unit 30. It is done as an event.

Here, the powder coating recovery unit 70 to recover the powder coating mist (mist) blowing as powder particles without being attached to the coating (B) of the powder coating sprayed from the spray units 20 at the lower side of the coating unit 10 ) Is configured.

The powder coating material recovery unit 70 recovers the powder coating mist which descends in the gravity direction by the air supplied from the air injection nozzles (not shown) of the coating unit 10 as a stream of air and collects the powder coating powder. It is made of a structure that can be supplied to the supply unit (40).

In this case, the air injected through the air injection nozzles (not shown) from the coating unit 10 may be discharged to the outside through a separate exhaust unit (not shown).

In the present embodiment, the air supply unit 30 is composed of a burner, a filter, a spray nozzle, a heating coil, a cooling coil and a humidification nozzle, and is supplied with outside air to remove various foreign matters such as dust and to remove the temperature and humidity of the outside air. It is made as an air supply source which can supply air to the coating part 10 and the powder coating material supply unit 40 by adding and subtracting.

The air supply unit 30 is connected to the coating unit 10 through the first air supply line 31, it is configured to be connected to the powder coating material supply unit 40 through the second air supply line (32).

In this case, the second air supply line 32 is provided with a throttle valve 35 having a conventional structure for selectively adjusting the opening degree of the flow path.

The throttle valve 35 receives an electric valve opening signal and operates according to the signal to adjust the opening degree of the second air supply line 32. The throttle valve 35 is a throttle valve having a conventional structure widely used in the art. As such, detailed description thereof will be omitted herein.

In the present embodiment, the powder paint supply unit 40 stores the powder paint storage tank 41 for storing the powder paint and the powder paint provided from the powder paint storage tank 41 while the powder paint is supplied through air. And a circulation tank 45 for storing the powder coating material returned from the coating part 10 while being supplied to the coating part 10.

Here, the circulation tank 45 is installed to be connected to the air supply unit 30 through the second air supply line 32, and is connected to the powder paint storage tank 41 through the first powder paint supply line 42. It is installed so as to be connected to the spray units 20 through the second powder paint supply line 43.

In the present embodiment, the coating film measuring unit 50 measures the thickness of the powder coating film attached to the surface of the coating film B while the coating film B is dried, and outputs the measured data to the controller 90. It is provided as a plurality corresponding to the upper and lower sides and the left and right sides of the workpiece (B).

Since the coating film measuring unit 50 is made of a non-contact coating film measuring sensor having a conventional structure widely used in the art, a description of more detailed configuration will be omitted herein.

In the present embodiment, the air amount adjusting unit 60 is controlled by the controller 90 according to the measurement data of the coating film measuring unit 50 to circulate the tank 45 of the powder coating material supply unit 40 from the air supply unit 30. To adjust the amount of air supplied to the

The air amount adjusting unit 60 is provided in correspondence with the spray units 20 and installed to be connected to a plurality of driving motors 61 and their drivings controlled by the controller 90, respectively. And a dial gauge 65 for applying a predetermined valve opening signal to the throttle valve 35 of the second air supply line 32 according to the rotational angle by the drive motor 61.

According to the action of the powder coating device 100 of the automotive coating line according to an exemplary embodiment of the present invention configured as described above, first, when painting the powder coating for the coating (B), the coating (B) is painting The air supplied to the booth space of the part 10 and supplied from the air supply unit 30 is supplied to the gravity direction, that is, the workpiece B from the booth space of the coating part 10 through the first air supply line 31. Is in a state of becoming.

In addition, the air provided from the air supply unit 30 is in a state of being supplied to the circulation tank 45 of the powder coating material supply unit 40 through the second air supply line 32.

In this state, the powder paint stored in the powder paint storage tank 41 of the powder paint supply unit 40 is first powdered by air supplied into the circulation tank 45 through the second air supply line 32. It is supplied to the interior of the circulation tank 45 along the paint supply line 42, and is supplied to the spray units 20 along the second powder paint supply line 43 in the circulation tank 45, Through the spray units 20 are sprayed to the surface of the workpiece (B).

In this process, among the powder coating sprayed onto the coating B, the powder coating mist which is not attached to the coating B and blown as powder particles is applied to the air injected from the air spray nozzles (not shown) of the coating unit 10. It descends in the direction of gravity.

Thereafter, the powder coating mist is collected by the powder coating unit 70, and is recovered to the circulation tank 45 by the pumping pressure acting separately.

After the process as described above, the coating film measuring unit 50 measures the thickness of the powder coating film attached to the coating (B) in the state that the coating (B) is completely dried and the controller 90 Will output

Then, the controller 90 compares the measurement data provided from the coating film measuring unit 50 with preset reference data, and if the actual coating film thickness of the object B is smaller than the reference coating film thickness corresponding to the reference data, The first control signal is applied to the drive motor 61 of the adjustment unit 60 to rotate the drive motor 61 clockwise by a predetermined value corresponding to the difference between the actual film thickness and the reference film thickness.

Accordingly, the dial gauge 65 of the air amount adjusting unit 60 rotates clockwise as much as the rotation angle of the drive motor 61, and the valve opening signal corresponding to the rotation angle is transmitted to the second air supply line 32. ) Is applied to the throttle valve 35. Then, the throttle valve 35 increases the opening amount of the second air supply line 32 to increase the amount of air supplied from the air supply unit 30.

As a result, as the amount of air supplied to the circulation tank 45 through the second air supply line 32 increases as described above, the powder coating material supplied to the spray units 20 from the circulation tank 45 is increased. The supply amount is also increased, thereby increasing the injection amount of the powder coating of the spray units 20.

On the other hand, the controller 90 compares the measurement data provided from the coating film measuring unit 50 with preset reference data, and if the actual coating film thickness of the coating object B is larger than the reference coating film thickness corresponding to the reference data, the air amount is adjusted. The second control signal is applied to the drive motor 61 of the unit 60 to rotate the drive motor 61 counterclockwise by a predetermined value corresponding to the difference between the actual film thickness and the reference film thickness.

Accordingly, the dial gauge 65 of the air amount adjusting unit 60 rotates counterclockwise by the rotation angle of the drive motor 61, and the valve opening signal corresponding to the rotation angle is transmitted to the second air supply line ( 32 to the throttle valve 35. Then, the throttle valve 35 reduces the opening amount of the second air supply line 32 to reduce the amount of air supplied from the air supply unit 30.

As a result, as the amount of air supplied to the circulation tank 45 through the second air supply line 32 decreases as described above, the powder coating material supplied to the spray units 20 from the circulation tank 45 is reduced. The supply amount is also reduced, thereby reducing the powder coating amount of the spray units 20.

Therefore, in the present embodiment, the coating film of the powder coating material attached to the coating object (B) is measured through the coating film measuring unit 50, and the supply amount of air for conveying the powder coating material according to the coating film thickness is automatically adjusted through the air amount adjusting unit 60. As a result, it is possible to form a powder coating film having a uniform thickness on the surface of the coating material (B) by controlling the injection amount of the powder coating material on the coating material (B).

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications and changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. Naturally, it belongs to the scope of the invention.

Since these drawings are for reference in describing exemplary embodiments of the present invention, the technical idea of the present invention should not be construed as being limited to the accompanying drawings.

Figure 2 is a block diagram schematically showing the configuration of a powder coating apparatus for a vehicle paint line according to the prior art.

Claims

A coating unit for coating the workpiece;

A plurality of spray units which are installed in the coating part and spray the powder coating material onto the coating object as air pressure;

An air supply unit supplying the air to the spray units;

A powder paint supply unit configured to be connected to the air supply unit to supply the powder paint to the spray units through the air;

A coating film measuring unit measuring the thickness of the powder coating film attached to the workpiece and outputting the measured data to a controller; And

An air amount adjusting unit controlled by the controller according to the measurement data of the coating film measuring unit to adjust the amount of air supplied from the air supply unit to the powder coating unit

Powder coating device for automobile coating line comprising a.

According to claim 1,

The air supply unit is configured to be connected to the powder coating unit through the air supply line, the powder coating device of the automotive coating line is provided with a throttle valve for selectively adjusting the opening degree of the flow path in the air supply line.

The method of claim 2,

The powder paint supply unit,

A powder paint storage tank for storing the powder paint and the powder paint supplied from the powder paint storage tank, while supplying the powder paint to the paint part through the air and at the same time, the powder paint returned from the paint part Powder coating device for an automobile paint line comprising a circulation tank to make.

The method of claim 3, wherein

The air supply unit is configured to be connected to the circulation tank through the air supply line,

The circulation tank is powder paint coating apparatus of the automobile coating line is installed to be connected to the powder coating tank through the first powder coating supply line, and connected to the spray units through a second powder coating supply line.

The method of claim 2,

The air amount adjusting unit,

And a dial gauge installed in connection with each of the spray units and connected to each of the driving motors to apply a predetermined valve opening signal to the throttle valve according to a rotation angle of the driving motor. Powder coating equipment for automobile coating line.