JPH08155355A - Coater - Google Patents

Abstract

PURPOSE: To provide a powder coater suitable for a long-sized material coating. CONSTITUTION: A coating booth 3 and a high-frequency heating furnace 4 are arranged adjacent to each other, a roller conveyor 2 is connected to the upstream side of the booth 3, and a roller conveyor 5 is connected to the downstream side of the furnace 4. A long-sized material 1 is passed through the booth 3 and furnace 4 by the conveyors 2 and 5, and a powder paint is sprayed on the material 1 and dried. Since an eddy current is generated in the material 1 in the furnace 4 to heat the material with the resistance loss, and then the coating film is cured in a short period, the space is saved, and the working time is shortened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating apparatus using a powder coating, and is particularly suitable for coating long members such as T-type long material for ships, members for construction, members for thermal power plants and members for bridges. Regarding coating equipment.

[0002]

2. Description of the Related Art In the conventional coating of a T-type longe material, as shown in FIG.
Then, the coating material, which was appropriately diluted with an organic solvent, was atomized into a mist to be ejected from the nozzle 101 and sprayed onto the object to be coated. Figure 1
Reference numeral 103 in 1 denotes a paint tank.

On the other hand, as a non-solvent type coating method for a lightweight material such as a cabinet, a powder coating method is beginning to be used as shown in FIG. 12, but the article 100 to be coated is caught by a hanger 112 and the rail 110 is made by a hanger 111. To be coated 100 along
Since it is conveyed to the coating booth 114 and the hot air stove 115 in that order, the object to be coated 100 is limited to a lightweight product that can be caught by the hanger 112, and the coating film is hardened by the hot air stove 11 as well.
This is what you do in 5. In FIG. 12, reference numeral 113 is a coating gun, reference numeral 116 is a hot air generating furnace, and reference numeral 117 is a hot air duct.

[0004]

However, the above-mentioned prior art has the following problems. (1) The organic solvent type requires about 1 day to dry after coating, and a large amount of time is lost when proceeding to the next work. (2) Organic solvent type paints have the risk of explosion and poor working environment, which may adversely affect health. (3) The curing time in the conventional hot-air oven for powder coating is long, and due to the size and cost of the hot-air oven, it is not suitable for coating long objects (several tens of meters) and heavy objects. .

The present invention is intended to solve such problems, and an object thereof is to provide a coating device which is quick-drying, inexpensive, and safe, particularly for a long and heavy object to be coated. And

[0006]

To achieve the above object, the coating apparatus of the present invention is characterized by adopting a powder coating method as a coating method and curing the coating film by dielectric heating at high frequency. In the coating apparatus according to claim 1, a coating booth provided with a coating gun and a powder coating machine capable of discharging powder coating from the coating gun, and an object to be coated are carried into the coating booth. An upstream side transfer device, a high frequency heating furnace provided downstream of the coating booth and provided with a high frequency heating coil formed in a shape surrounding the object to be coated, and a high frequency heating furnace provided downstream of the high frequency heating furnace. It is characterized in that it comprises a downstream side transfer device for carrying out the above-mentioned object to be coated whose coating film has been cured in the high frequency heating furnace.

According to the second aspect of the present invention, a sensor for detecting the position of the object to be coated is attached to each of the upstream side conveying device and the downstream side conveying device, and the temperature of the high frequency heating furnace is detected. And a control system for controlling the operation of the powder coating machine and controlling the current of the high-frequency heating coil according to the detection signals of the sensors.

Further, in the coating apparatus according to the third aspect, a coating film sensor for detecting the coating film thickness of the coating object is provided at a downstream portion of the high frequency heating furnace, and the coating signal is detected by the coating film sensor. It is characterized in that a control system for controlling the amount of paint discharged from the coating film gun is provided.

[0009]

In the above-mentioned coating apparatus of the present invention, the spraying and drying of the powder coating material on the object to be coated are successively carried out while the object to be coated is conveyed to the coating booth and the high frequency heating furnace in this order. The operation control of the powder coating machine, the current control of the high frequency heating furnace, and the control of the coating film thickness are performed under automatic control.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A coating apparatus as an embodiment of the present invention will be described below with reference to the drawings. FIG.
2 is a side view of the upstream side transport device, and FIG. 3 is A- of FIG.
A sectional view taken along the arrow A, FIG. 4 is a sectional view taken along the line BB of FIG. 2, FIG. 5 is a schematic side sectional view of a main part of the high-frequency heating furnace, FIG. 8 is a side sectional view of the downstream side conveying device, FIG. 9 is a sectional view taken along the line CC of FIG. 8, and FIG. 10 is a sectional view taken along the line DD of FIG.

In this embodiment, a longe material 1 having a T-shaped cross section is used as an object to be coated, and the longe material 1 is mounted on an upstream side conveying device 2 and carried into a coating booth 3 before coating. Painted in paint booth 3, then paint booth 3
The coating film is cured in the high-frequency heating furnace 4 disposed adjacent to, and is delivered by the downstream side transport device 5. The longe material 1 is a strength member for ships, and its length reaches 20 m or more. Then, the above work is performed completely automatically.
The contents and functions of the device will be described below. The arrow V in FIG. 1 indicates the transport direction of the longe material 1.

The upstream side transport device 2 has basically the same structure as a roller conveyor, and as shown in FIGS.
A plurality of rollers 16 are mounted on the gantry 10 so as to be rotatable by roller shafts 17 at equal intervals in the conveyance direction of the longe material 1. Sprocket 14 on the top roller shaft
15 is mounted across the roller 16, and the sprocket
The output shaft of the electric motor 12 is connected to 14 via a chain 13. The electric motor 12 is attached to the mount 10. Reference numeral 10a indicates a leg member.

With this configuration, when the electric motor 12 rotates, the leading roller shaft also rotates. On the other hand, the sprocket 15 is attached to all the roller shafts 17 including the leading roller shaft, and when the leading roller 16 rotates, all the rollers 16 rotate in the same direction. Reference numeral 18 indicates a chain that engages with the sprocket 15. Therefore, the longe material 1 mounted on the roller 16 is indicated by the arrow V in FIG.
Will be transported in the direction. On the other hand, the longe material 1 is functionally required to be coated except for the welding surface 1b, and therefore is conveyed in an unstable posture with the wide face surface 1a facing up.

Therefore, a plurality of pairs of rollers 19 are provided to support the longe material 1 from both sides thereof and prevent the longe material 1 from tilting. Reference numeral 21 indicates each rotary shaft of each roller 19, reference numerals 20a and 20b indicate brackets for supporting each rotary shaft 21, and the brackets 20a and 20b are attached to the left and right columns 11 on the frame 10, respectively. A first sensor 22a is attached to the column 11 located on the most downstream side of the upstream side transport device 2 (see FIG. 4) so as to detect the presence or absence of the longe material 1 to be coated.

As shown in FIG. 5, the coating booth 3 is surrounded by an outer wall 3a so that the coating material does not come out.
It should be noted that slit holes 31 matching the cross-sectional shape of the longe material 1 are formed in the front and rear portions of the outer wall 3a so that the longe material 1 can pass through. Further, a discharge port 39 for collecting excess paint is provided on the ceiling of the outer wall 3a.

Reference numeral 36 indicates a powder coating machine, which is a hose.
Through 38, the paint is sprayed to both sides of the longe material 1 from the coating guns 32a and 32b arranged in the coating booth surrounded by the outer wall 3a. The coating guns 32a, 32b are attached to sliders 33a, 33b which move up and down independently by electric motors 34a, 34b. It can be attached to the surface to be painted.

The electric motors 34a and 34b are the first sensors.
22a detects that the longe material 1 has been carried in and starts driving, and a second sensor 22b described later detects that the longe material 1 has come out and stops driving.
The controller 43 is for performing the control.

On the other hand, the powder coating machine 36 is also designed to control its operation / stop depending on the presence or absence of the longe material 1. In addition, the coating film sensor 61, which will be described later, detects the thickness of the coating film, and feedback control is performed to control the amount of coating material sprayed from the coating guns 32a and 32b based on the detected value. Reference numeral 37 denotes a controller that outputs a command signal to the powder coating machine 36. Thereby, the target coating film thickness can be obtained.

A filter 41 and a vacuum pump 42 are installed in this order on the downstream side of the discharge port 39, and an extra paint in the coating booth is collected through a duct 40 opening to the discharge port 39. As shown in FIG. 7, the high-frequency heating furnace 4 includes a high-frequency heating coil 54 formed in a shape surrounding the cross section of the longe material 1, and the high-frequency heating coil 54 supports the pedestal 51 with a support A52, a support. It is attached via B53.

The high frequency heating coil 54 receives the high frequency current when the longe material 1 is carried into the coil 54 and generates an eddy current as an induced current on the surface of the longe material 1,
The resistance loss serves to raise the temperature of the longe material 1, and due to this temperature rise, the coating material attached to the surface of the longe material 1 begins to cure due to a chemical reaction. The high frequency current is generated by the high frequency power supply device 56 and supplied to the high frequency heating coil 54. Further, a controller 57 is connected to the high frequency power supply device 56 to detect the presence or absence of the longe material 1 by the first and second sensors 22a and 22b, and a temperature sensor 55 (the temperature sensor 55 indicates the internal temperature of the high frequency heating furnace 4). For detection, sensing of the surface temperature of the Longe during heating by the support A52) is used to start and stop the high frequency power supply 56 and control the magnitude of the current. This enables stable heating. If necessary, a vacuum type removing device may be provided between the coating booth 3 and the high-frequency heating furnace 4 to remove excess paint.

As shown in FIGS. 8 to 10, the downstream side transport device 5 has basically the same structure as the upstream side transport device 2, but the downstream side transport device 5 includes no upstream transport device 2. A missing coating film sensor 61 is attached to the column 11 closest to its carry-in end, allowing feedback control of the coating film as described above. Furthermore, on the pillar 11 closest to the carry-out end,
The second sensor 22b for detecting the presence / absence of the longe material 1 is attached, and as described above, in order to automatically control the start and stop of paint ejection and the operation or stop of the high-frequency heating furnace 4, the longe material is provided. The presence / absence of 1 is detected.

In the above-mentioned structure, the long lozenge material 1 is conveyed in the order of the coating booth 3 and the high frequency heating furnace 4 by the upstream side conveying device 2 and the downstream side conveying device 5, whereby the coating booth 3 and the high frequency heating furnace 4 are conveyed. In, the powder coating and the coating film curing can be performed while the longi material 1 is transported (moved). Since the longi material 1 itself is heated in the high frequency heating furnace 4, the coating film of the paint applied to the longi material 1 is cured in a short time, and the time from the spraying of the coating material to the curing of the coating film is, for example, about 1 minute. It can be shortened in a short time. Therefore, it is not necessary to set the size of the coating booth or the high-frequency heating furnace to the length of the object to be coated, even if the object to be coated is longer than 20 m, such as longe material. And, the coating time can be shortened.

Further, the powder coating machine 36 and the high frequency heating furnace 4
Since it is operated under automatic control, unmanned operation is possible, which is advantageous in terms of operating cost. Furthermore, because it is powder coating, compared to coating with organic solvent type paint,
Safe and hygienic.

[0024]

As described above in detail, according to the coating apparatus of the present invention, the following effects and advantages can be obtained. (1) Powder coating for long and heavy objects over 20 m is possible, which is safer and more hygienic than the conventional organic solvent type. (2) Since the coating material is sprayed and dried while the coating object is transferred to the coating booth and the high-frequency heating furnace in this order, set the coating booth and the superheating furnace to the length according to the dimension of the coating object. It is not necessary and is advantageous in space. (3) The time required for the coating film to harden after spraying the coating material is about 1 minute, and the work efficiency can be greatly improved as compared with the conventional method, which can significantly reduce the cost.

[Brief description of drawings]

FIG. 1 is a schematic side view of a coating apparatus as an embodiment of the present invention.

FIG. 2 is a side view of the upstream side transport device.

3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is a sectional view taken along the line BB of FIG.

FIG. 5 is a schematic cross-sectional side view of a main part of the high-frequency heating furnace.

FIG. 6 is a front sectional view showing a main part of the high-frequency heating furnace.

FIG. 7 is a side sectional view of a high frequency heating coil of the same high frequency heating furnace.

FIG. 8 is a side view of the downstream side transport device.

9 is a cross-sectional view taken along the line CC of FIG.

10 is a cross-sectional view taken along the line DD of FIG.

FIG. 11 is a schematic diagram of a conventional solvent type coating device.

FIG. 12 is a schematic view of the powder coating device.

[Explanation of symbols]

 1 Longy material as an object to be coated 2 Upstream transfer device 3 Coating booth 4 High frequency heating furnace 5 Downstream transfer device 10 Frame 11 Column 12 Electric motor 13, 18 Chain 14, 15 Sprocket 16 Roller 17 Roller shaft 19 Roller 20a, 20b Bracket 22a 1st sensor for detecting the presence or absence of longe material 22b 2nd sensor 31 Slit holes 32a, 32b Coating guns 33a, 33b Sliders 34a, 34b Electric motor 36 Powder coating machine 37 Controller 39 Discharge port 42 Vacuum pump 43 Controller 51 Frame 54 High frequency heating coil 55 Temperature sensor 56 High frequency power supply 57 Controller 61 Coating film sensor

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kenichiro Matsuda No. 1-1 Atsunoura-machi, Nagasaki-shi Nagasaki Shipyard Ltd. (72) Inventor Nobuaki Sooo 3-5 Otanicho, Nagasaki-shi Hishiken Co., Ltd. Inside the tech

Claims (3)

[Claims] 1. A coating booth provided with a coating gun and a powder coating machine capable of discharging powder coating from the coating gun, an upstream side transporting device for loading an object to be coated into the coating booth, and the above coating. A high-frequency heating furnace provided downstream of the booth and provided with a high-frequency heating coil formed in a shape surrounding the object to be coated, and a high-frequency heating furnace provided downstream of the high-frequency heating furnace to cure the coating film in the high-frequency heating furnace. And a downstream side conveying device for carrying out the above-mentioned coated object. 2. The coating apparatus according to claim 1, wherein a sensor for detecting the position of the object to be coated is attached to each of the upstream side transport device and the downstream side transport device, and the temperature of the high frequency heating furnace is controlled. A coating apparatus provided with a sensor for detecting, and a control system for controlling the operation of the powder coating machine and controlling the current of the high-frequency heating coil according to the detection signals of the sensors. 3. The coating apparatus according to claim 1, wherein a coating film sensor for detecting the coating film thickness of the coating object is provided at a downstream portion of the high-frequency heating furnace, and the coating film sensor detects the coating film sensor. A coating apparatus, which is provided with a control system for controlling the amount of paint discharged from the coating film gun by a signal.