JP2002028845A - Heat-removing device for paint film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a removing method for a paint film and a device for the removing method that remove an old paint film and coating before the application of a repair paint to a steel structure and the like. SOLUTION: The heat-removing device 1 has a high-frequency heating unit 5, a belt grinder 7 and a drive 6 integrally mounted on a carriage 35. The belt grinder 7 comprises a belt 8 provided with abrasive grains glued to the surface and entrained between a front-rear pair of wide belt pulleys 10, and a transmission belt 14 entrained about vertically disposed transmission pulleys 13 and 15. When energized via a cable 4b, the drive 6 of the belt grinder 7 actuates an electric motor to transmit torque from one transmission pulley 15 to the other transmission pulley 13 and to turn the belt 8 via the belt pulley 10. The heat-removing device 1 can provide heating and removal of a paint film while the carriage 35 is moved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for removing a coating film applied to a steel structure or the like by heating.

[0002]

2. Description of the Related Art A coating film applied on the surface of a steel structure deteriorates during long-term use, and causes peeling and cracking. Therefore, in the repair coating, the undercoat treatment is performed by removing the old coating layer. 2. Description of the Related Art Conventionally, as a method of removing a coating film or a coating film on the surface of a steel structure, a blast method in which a grinding material such as sand (sand) or shot (a billet) is sprayed is generally performed. As an alternative to this, an ice blasting method has been developed in which dry ice particles are sprayed at high speed onto the coating film surface through compressed air to wash the coating film and peel off the coating film.

[0003]

However, in the blasting method, the sprayed abrasive is scattered to the surroundings, thereby deteriorating the working environment, and a lot of time and cost are required for measures to prevent the scattering of the abrasive and to collect the abrasive. There was such a problem. In addition, the ice blasting method has the advantage that the dry ice particles as a spray material sublimate after use, so that they do not deteriorate the environment even if they scatter around, and that post-processing is not required, On the other hand, since the hardness of the dry ice particles is low, there is a disadvantage that the processing ability is remarkably low as compared with the sand blasting method.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and provides a method and an apparatus for removing an old paint film or a paint film for removing a paint film before performing repair painting of a steel structure or the like. With the goal.

[0005]

In order to achieve the above object, the present invention provides a high-frequency heating unit for heating a coating layer,
A belt grinder for removing the heated coating layer and a removing device including a driving device for the belt layer are provided.A belt grinder is installed at the same position as the high-frequency heating unit, and the position and timing of heating and removing the coating layer are determined. They are implemented together. In the above invention, the high-frequency heating unit includes a heating coil, a cooling fin, a high-frequency power supply circuit, and a control unit, and can be built in and installed in a case. Further, in the above invention, the heat removing device can be installed on a movable trolley that can be manually transported and move on the coating layer, and the coating layer can be removed while moving the movable trolley.

[0006] In the above invention, the belt grinder may be a belt having abrasive grains adhered to a surface thereof, wound around a pair of belt wheels, and passing below the high-frequency heating unit.
It can be constituted by a pressing mechanism for pressing the belt surface against the coating film layer and a driving device for rotating the belt. In the above invention, the main body of the belt is formed of a non-conductive material. A wire brush wheel in which a number of wire pieces are implanted around the axis is installed close to the rotation locus of the belt of the belt grinder to remove coating film debris adhered to the belt surface. Further, in the above invention, the belt grinder has a plurality of fine protrusions formed on a surface in a width direction at intervals, and a belt wound between a pair of sprockets, and the belt surface is pressed against a coating layer. It can be composed of a pressing mechanism and a driving device that rotates the belt.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of a first embodiment of a coating film heating and removing apparatus according to the present invention will be described with reference to the drawings. As shown in the overall schematic diagram of FIG. 1, the heat removal apparatus 1 for a paint film of the present invention is installed movably in the front-rear direction along the paint surface to be removed. The heating and removing apparatus 1 is installed at the same position as the high-frequency heating unit 5 and a high-frequency heating unit 5 connected to a power supply (three-phase 200 V, not shown) via a cable 4a, and connects the belt grinder 7 and the cable 4b. The removing device 3 includes a driving device 6 connected to a power source (three-phase 200 V, not shown) via a power source. The operation is performed while simultaneously moving the high-frequency heating unit 5 and the belt grinder 7.
The coating layer is heated, and at the same time, the softened coating layer is removed by the belt grinder 7 in synchronization with the timing, and the removed coating dust is collected through the collection hose 20.

FIG. 2 to FIG. 3 show an apparatus 1 for heat removal of a paint film.
The specific configuration of is shown. As shown in FIG.
Is mounted on a moving carriage 35 by integrating the high-frequency heating unit 5, the belt grinder 7 and the driving device 6, and can perform heating and removal of the paint film while moving the moving carriage 35. The high-frequency heating unit 5
As shown in FIG. 4A, a compact configuration including a heating coil 24, cooling fins 25, a high-frequency power supply circuit 26, and a control unit 27 is provided, and these devices are built in a case 29. In addition, on the upper part of the high frequency heating unit 5,
Cooling fins 2 for protecting the high-frequency power supply circuit 26 from temperature rise
5 is provided at the center of the main body 11 of the carriage 35 via a case 29 (FIG. 2). FIG. 4B shows a configuration example of the high-frequency power supply circuit 26.

Further, the heating coil 24 is shown in FIG.
As shown in (b), a litz wire (meshed copper wire) 2 is placed around a ferrite core 32a (two pieces in the figure) having a cross section of a co-shape.
4a is wound a plurality of times. Power is supplied to the litz wire 24a via the cable 4a, and the litz wire 24a is converted into a high frequency by the control unit 27 and the high frequency power supply circuit 26 and energized.
When a high-frequency current is applied to the litz wire 24a, the litz wire 24a
Magnetic flux is generated around the. This magnetic flux is transferred to the ferrite core 3
When the light is efficiently focused and guided to the steel sheet surface via 2a, current flows only on the very surface of the steel sheet opposite to the ferrite core 32a (skin effect), and this portion is partially heated. Therefore, the coating film adhering to the surface of the steel sheet is softened by this heat.

The belt grinder 7 has a surface on which abrasive grains are adhered, and a conveyer-shaped belt (a belt body is a non-conductive material) wound between a pair of front and rear wide belt wheels 10, 8.
And a conduction belt 14 wound around conduction wheels 13 and 15 disposed in the vertical direction. When energized via the cable 4b, the driving device 6 of the belt grinder 7 operates an electric motor (not shown) to convert and reduce the rotation of the motor (a bevel gear device is shown in the drawing). It is configured. Then, the decelerated torque is transmitted to one of the transmission wheels 1
5 to the other transmission wheel 13 to rotate the belt 8 via the belt wheel 10. Further, the belt grinder 7 includes a pressing mechanism (described later) that presses the surface of the belt 8 to the coating layer via the pressing plate 23. In addition, although the electric motor was shown as an example here, the drive device 6 may be an air motor or the like.

FIG. 5C shows a change in temperature at a heating point a (see FIG. 5B) when the heating coil 24 is moved to the left. It has been confirmed that the temperature rises greatly at the portion c and decreases rapidly after leaving this point. This indicates that it is most effective to complete the operation of removing the heating position by the belt 8 while the entire heating coil 24 passes (immediately before). Therefore, as described above, the belt 8 is arranged so as to surround the outer periphery of the high-frequency heating unit 5 so that the pair of front and rear belt wheels 10,
Winding between 10 (see FIG. 2), heating and removal at the same position,
That is, the lower part of the high-frequency heating unit 5 is configured to perform the timing so that the paint film can be removed. In addition, the belt wheel 10 is connected via a bearing 16 to
The transmission wheel 13 is fitted on the main shaft 18 of the moving roller 12 of the moving carriage 35 via the bearing 17, and the transmission wheel 13 is integrated with the belt wheel 10. Therefore, the belt wheel 10 and the belt 8 can rotate independently and independently of the moving operation of the movable cart 35 (see FIG. 3).

As shown in FIG. 6, the pressing mechanism comprises a spring 30 mounted between the pressing plate 23 placed on the belt 8 and a flange formed on the case 29 of the heating unit 5. By urging the plate 23 downward, the belt 8 passing below the heating unit 5 is moved at a predetermined pressure.
Pressing on 1 The moving carriage 35 is provided with the moving roller 12 and the handle 22 (also used as a handle of the belt grinder 7 in the figure) as described above, and is arbitrarily moved manually on the painted surface via the handle 22. The removal target position can be moved or carried. In addition, the hood 9 is installed on the movable carriage 35 so as to cover the heating / removal processing range, so that the removed coating film debris is prevented from being scattered, and is collected via the collection hose 20. .

The operation and effect of the heat removal apparatus according to this embodiment will be described below. After the worker places the movable cart 35 on the surface to be removed using the handle 22 and then energizes the high-frequency heating unit 5 via the cable 4a, the control unit 27 and the high-frequency power circuit 26 Is converted to When a high-frequency current is applied to the litz wire 24a, the very surface layer of the steel structure (conductive material) 50 is heated (due to the skin effect), and the coating layer 51 is softened by receiving the heat. At this time, air is supplied from the cooling air intake 28 to cool the inside of the high-frequency heating unit 5.

On the other hand, when power is supplied to the driving device 6 via the cable 4b and the driving device 6 is driven, the transmission wheels 15,
The belt wheel 10 rotates via the conduction belt 14 and the conduction wheel 13, whereby the abrasive-coated belt 8 rotates and the softened coating layer 51 a is removed by being scraped off.
At this time, the pressing plate 23 presses the contact surface of the belt 8 with the coating layer 51 toward the coating layer 51, so that the coating layer 5
1 can be efficiently removed. The removed coating film debris is collected in the hood 9 and is sequentially collected through a collection hose 20. The above-described heating and removing operations are performed continuously over the entire target range while the operator moves the movable cart 35 at a predetermined speed. As described above, the heating and removing apparatus of the present embodiment heats and coats the coating film layer 51 while moving the moving carriage 35.
Since it can be removed, the apparatus configuration is simplified and downsized, work efficiency is improved, and the total work time including preparation work is reduced. Further, in this example, since the belt 8 with abrasive grains is rotated below the high-frequency heating unit 5, the removal operation is performed when the processing surface is heated to a predetermined temperature and the coating film layer is softened most. Thus, there is an effect that a high-quality treated surface free of residue can be efficiently obtained.

Next, a second embodiment of the present invention will be described with reference to the drawings. The present embodiment relates to a heating and removing apparatus provided with an apparatus for removing coating film debris attached to a belt. As described in the first embodiment, the belt grinder 7 wound between the pair of belt wheels 10, 10 is used.
The belt 8 with abrasive grains rotates below the heating unit 5, but in the present embodiment, as shown in FIG. A wire brush wheel 31 for removing dust is installed. The wire brush wheel 31 is disposed over the entire width of the wide belt 8 with abrasive grains, and is disposed on the outer periphery of the rotating shaft 31b and near the belt wheel 10 located on the rear side. This wire brush wheel 31 has a wire brush 31a on which a large number of wire pieces are implanted, and the wire brush 31a.
Is placed in contact with the surface of the belt 8 and rotates following the flow of the belt 8.

The operation of this embodiment is as follows.
With the start of the removal operation, the softened coating layer is scraped off by the belt 8 with abrasive grains. At this time, a part of the scraped coating debris adheres to the surface of the belt 8 and rotates.
The performance of removing the belt 8 gradually decreases. However, in the present embodiment, since the coating film debris adhered to the surface of the belt 8 is sequentially scraped off by the action of the wire brush wheel 31, the belt 8 can maintain a predetermined removal performance for a long period of time. There is.

A third embodiment of the present invention will be described with reference to the drawings. In the present embodiment, the belt of the belt grinder is modified. 8 (a), 8 (b),
As shown in (c), the belt 41 of the present embodiment has a rib-shaped minute projection 4 on the surface of the belt body (non-conductive material).
2 are extended in the width direction of the belt 41, are arranged in a large number at predetermined intervals in the rotation direction of the belt 41, and have a large number of engagement grooves 41a formed on both side ends of the back surface. Further, a sprocket 40 is provided in place of the belt wheel 10 of the first embodiment. On the outer periphery of the sprocket 40, a pair of sprockets 40 each having a plurality of meshing teeth 40a which are engaged with meshing grooves 41a formed on the inner circumferential surface of the belt 41 are provided. The belt 41 has a meshing groove 41a which engages with the meshing tooth 40a.
, And is wound around the sprocket 40 by the drive device 6 as in the first embodiment. The belt 41 is, similarly to the first embodiment, provided with the holding plate 2.
3 and pressed against the coating layer 51 by the spring 30.

The operation of this embodiment is as follows. When the removing operation is started and the driving device 6 is driven, the belt 41 rotates via the sprocket 40, and the softened coating film layer is scraped off by the minute projections 42 and removed. At this time, the rotation of the driving device 6 is reliably transmitted from the sprocket 40 to the belt 41, and the slip does not occur.
The coating layer is reliably and efficiently removed by the minute projections 42 without being left behind. At that time, the removed coating debris,
As in the first embodiment, the belt 41 is separated without adhering to the surface of the belt 41, so that the belt 41 can maintain a predetermined removal performance for a long period of time.

Although the embodiments of the present invention have been described above, the present invention is, of course, not limited thereto, and various modifications can be made based on the technical concept of the present invention. For example, in the above embodiment, the pair of belt wheels 10
However, the number of the belt wheel 10 may be three or more, and the diameter of the belt wheel 10 may be different.

[0020]

As described above, in the apparatus for heating and removing a coating film according to the present invention, the belt below the high-frequency heating unit is set so that the belt with the abrasive grains rotates. When the coating is heated and the coating layer is softened most, the removing operation can be performed, and there is an effect that a high-quality treated surface free of any residue can be efficiently obtained. Since the coating layer can be heated and removed while moving the movable cart, the apparatus configuration is simplified and downsized, the working efficiency is improved, and the total working time including the preparation work is reduced.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram related to an apparatus for removing a coating film by heating according to a first embodiment of the present invention.

FIG. 2 is a side view of the heating and removing apparatus according to the first embodiment of the present invention.

FIG. 3 is a view as viewed in the direction of arrows AA in FIG. 2;

FIG. 4A is a configuration diagram of a high-frequency heating unit of the heat removal apparatus of FIG. 2; (B) It is a figure which shows the example of a power supply circuit structure of a heat removal apparatus.

FIG. 5A is a plan view illustrating a configuration of a heating coil of the heating and removing apparatus. (B) is a view on arrow BB in FIG. 5 (a). (C) is a figure which shows the temperature change of the heating coating surface of a heat removal apparatus.

FIG. 6 is a detailed view of a main part near a heating coil of the heating and removing apparatus of FIG. 2;

FIG. 7 is a configuration diagram of a heating and removing apparatus according to a second embodiment of the present invention.

FIG. 8A is a diagram illustrating a main part of a heating and removing apparatus according to a third embodiment of the present invention. FIG. 8 (b)
FIG. FIG. 9C is a perspective view of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heat removal device of coating film 3 Removal device 4a, 4b Cable 5 High frequency heating unit 6 Drive device 7 Belt grinder 8 Belt 9 Hood 10 Belt wheel 11 Main body 12 Roller for movement 13, 15 Conduction wheel 14 Conduction belt 16, 17 Bearing Reference Signs List 18 main shaft 20 collection hose 22 handle 23 holding plate 24 heating coil 24a litz wire 25 cooling fin 26 high frequency power supply circuit 27 control unit 28 cooling air intake 29 case 30 spring 31 wire brush wheel 31a wire brush 31b rotating shaft 32a ferrite core 35 movement Dolly 40 Sprocket 40a Meshing teeth 41 Belt 41a Meshing groove 42 Micro projection 50 Steel structure 51, 51a Coating layer

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroshi Kondo 4-6-22 Kannon Shinmachi, Nishi-ku, Hiroshima-shi, Hiroshima Mitsubishi Heavy Industries, Ltd. Hiroshima Works (72) Inventor Motoyoshi Ishii Kannon-Shimmachi 4, Nishi-ku, Hiroshima-shi, Hiroshima No. 6-22, Mitsubishi Heavy Industries, Ltd. Hiroshima Works (72) Inventor Junyuki Hasegawa 4-62, Kannon Shinmachi, Nishi-ku, Hiroshima-shi, Hiroshima F-term in Hiroshima Works, Mitsubishi Heavy Industries, Ltd. 3B116 AA46 AB54 BA01 BA22 BB71 BB82 CD23 3C047 KK08 3C058 AA06 AA12 AA19 AC01 BA05 BA08 CA01 CB03 4D075 BB03Z BB20Z BB35Z DA23 DB02 DC05

Claims (7)

[Claims] 1. A high-frequency heating unit for heating a coating layer and a belt grinder for removing the coating layer heated by a rotatable belt are provided, and the belt is arranged close to the high-frequency heating unit. A coating film heating and removing apparatus, characterized in that: 2. The high-frequency heating unit according to claim 1, wherein the high-frequency heating unit includes a high-frequency heating coil, a cooling fin, and a high-frequency power supply circuit, and is disposed in a case of the high-frequency heating unit. Heat removal device for film. 3. The coating according to claim 1, wherein the high-frequency heating unit and the belt grinder are installed on a movable trolley, and the coating layer is removed while moving the movable trolley. Heat removal device for coating film. 4. The apparatus according to claim 1, wherein the belt is made of a non-conductive material. 5. The belt of the belt grinder is wound between a pair of belt wheels, and abrasive grains are adhered to a surface of the belt. The high-frequency heating unit is disposed on an inner peripheral side of the belt. 5. The apparatus according to claim 1, further comprising a pressing mechanism for pressing a contact surface of the coating layer toward the coating layer. 6. A wire brush wheel on which a number of wire pieces are implanted around an axis is installed in proximity to the rotation locus of the belt of the belt grinder, and paint scraps adhered to the belt surface by the wire pieces. The apparatus for removing a coating film by heating according to any one of claims 1 to 5, wherein the apparatus is configured to remove the paint. 7. A plurality of fine projections are provided on the surface of the belt of the belt grinder at intervals in the circumferential direction of the belt, and the belt is wound between a pair of sprockets. The apparatus for heating and removing a coating film according to any one of claims 1 to 4, further comprising a pressing mechanism for pressing a contact surface of the coating layer of the belt toward the coating layer.