JPS6254673A - Peeling method for lining material and thick film coating material - Google Patents

Abstract

PURPOSE:To weaken the adhesive strength of lining material and permit to peel lining material from a metal object easily and efficiently by heating the surface of the metal object with an induction heat coil. CONSTITUTION:A part of lining material 10 on the surface of a steel plate 12 coated by the lining material 10 to be peeled, is peeled roundly by a hammer etc. A air injection port 26a is directed to this peeled part and an inductive heat coil 13 is placed on it. Next, high frequency current is applied to a coil shaped coil 15 in the inductive heat coil 13 by the operation of an operation device 23 and the steel plate 12 is inductively heated. As a result, the surface of the steel plate 12 is heated and primer material 11 or lining material 10 is softened by heating, thus adhesive strength is weakened. Furthermore, compressed air is poured into the air injection port 26 so that the air may be blown into a gap between the risen lining material 10 and the steel plate 12 whereby the lining material 10 having the weakened adhesive strength can be peeled from the steel plate 12.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for peeling off a lining material and a thick film coating material applied to the surface of a metal material such as iron.

[Conventional technology]

Structures made of metal materials such as steel usually have corrosion-resistant (including chemical-resistant) or wear-resistant properties on their surfaces.
Lining material is applied.

This lining material usually uses a primer material made of resin-based paint as an undercoat, and is applied onto the primer material and adheres to the metal object.

Steel structures made of such steel materials (e.g.
Tanks, etc.) are normally inspected periodically to prevent accidents, etc., but in this case, if lining material is applied to the surface, inspections (e.g. external inspection, ultrasonic flaw detection, It was necessary to remove the lining material because it interfered with penetrant inspection, magnetic particle inspection, etc.

In some cases, a thick film coating material made of synthetic resin such as epoxy may be applied to the surface of the metal object, and if this thick film coating material is also used to inspect the metal object, It was necessary to peel it off.

[Problem that the invention seeks to solve]

However, conventional methods for stripping off the lining material or thick coating material include stripping the lining material or thick coating material by hitting it with a hammer or the like, or by sandblasting. The method of peeling off with a hammer or the like is extremely inefficient, and there is a problem in that it is difficult to uniformly peel off the lining material or thick film coating material.

In addition, the method of stripping off the lining material or thick film coating material by sandblasting is inefficient as it involves gradually stripping off the lining material or thick film coating material from the surface, and the method uses sand blasting. Therefore, there was a problem that post-processing was difficult.

The present invention was made in view of the above circumstances, and an object of the present invention is to provide a method for peeling off a lining material and a thick film coating material, which uniformly and efficiently removes the lining material or the thick film coating material.

[Means to solve problems]

A method for peeling off a lining material and a thick film coating material according to the first invention which achieves the above object includes attaching an induction heating coil to a metal object coated with a lining material or a thick film coating material to be removed. , passing an alternating current through the induction heating coil to heat at least the surface of the metal object, and weaken the adhesion strength by heating the adhesion part of the primer material or thick film coating material that reinforces the adhesion strength of the lining material. It is constructed by removing the lining material or the thick coating material.

In addition, a method for peeling off a lining material and a thick film coating material according to a second aspect of the present invention that achieves the above object includes applying an induction heating coil to a metal object coated with a lining material or a thick film coating material to be removed. At the same time, a gas injection hole is provided in the lining material or thick film coating material located inside the induction heating coil to reach the metal object, and then an alternating current is applied to the induction heating coil to at least heat the metal object. As well as heating the surface of
It is constructed by injecting gas through the gas injection hole to fill the intermediate part between the lining material or thick film coating material and the metal object, and peeling the lining material or thick film coating material from the metal object. ing.

Here, lining material refers to a material that is applied to the metal surface of a metal object such as a steel plate for chemical resistance or wear resistance (for example, Flake Guard No. manufactured by Nippon Oil & Fats Co., Ltd.).
1000 (glass flake reinforced unsaturated polyester resin), or Chemiflake EV-7OR or Chemflake EV-70H manufactured by Toyo Rubber Industries, Ltd.), and the primer material is applied to the first layer of the metal surface and The lining material that is applied after the 2N is a material that reinforces the adhesion (for example, NOF type Flake Guard Brimer or Toyo Tire &Rubber's P-05R, etc.), and the thick film coating material is a lining material that is applied for corrosion prevention, etc. A coating material made of synthetic resin such as epoxy that is applied to the surface of metal.

In addition, in the methods for peeling lining materials and thick film coating materials according to the first and second inventions, the alternating current applied to the induction heating coil may be a commercial frequency power source;
It is preferable to apply high frequency power to heat only the surface of the metal object.

[Effect]

Next, the operation of the method for peeling off the lining material and thick film coating material according to the first invention will be explained.

An induction heating coil is attached to a metal object coated with a lining material or thick film coating material to be removed, and an alternating current is passed through the induction heating coil to induction heat the surface of the metal object. As a result, the lining material, primer material, or thick film coating material adhering to the metal surface is heated and softened by heat, reducing the adhesive strength of the lining material or thick film coating material. , it will fall due to gravity, or it will be possible to scrape it off with a scraper or the like.

Furthermore, when the metal surface is further heated by an induction heating coil, a portion of the primer material or thick film coating material may vaporize, generating gas from within and promoting the peeling of the lining material or thick film coating material. become.

Next, the difference between the operation of the method for peeling off the lining material and thick film coating material according to the second invention and the method for peeling off the lining material and thick film coating material according to the first invention will be explained.

The lining material or thick film coating material located inside the induction heating coil is provided with a gas injection hole that reaches the metal object, and gas is injected through the gas injection hole to create a gap between the lining material, etc. and the metal object. Air is injected into the metal object, and the lining material or thick film coating material whose adhesive strength has decreased due to heat is actively peeled off from the metal object.

〔Example〕

Next, while referring to the attached drawings, first, the above-mentioned second
An example embodying the method for peeling off a lining material and a thick film coating material according to the invention will be explained to provide an understanding of the invention.

Here, FIG. 1 is a sectional view showing a state in which a method for peeling off a lining material according to an embodiment of the method for peeling off a lining material and a thick film coating material according to the second invention,
FIG. 2 is a plan view of an induction heating coil used in the lining material peeling method according to the above embodiment, and FIG. 3 is a sectional view taken along the line A--A in FIG. 2.

As shown in FIGS. 1 and 2, an induction heating coil 13 is placed on the surface of a steel plate 12, which is an example of a metal object, to which a lining material 10 is applied via a primer material 11. To explain this induction heating coil 13 in detail, as shown in FIG. A cooling fin 16 resting in contact with the upper part, a storage case 17 for the coil 15 and the cooling fin 16, and a winding start and end of the coil 15 arranged at the upper part of the storage case 17 are connected. The terminal 18 is configured to include a terminal 18.

The cooling fins 16 have a planar lower part and the coil 1
5, an arcuate groove 19 is formed in the upper part of the storage case 17, and the cooling fins are cooled by air entering from a ventilation hole 20 provided on the upper surface of the storage case 17 and connected to a fan (not shown). 16 is cooled, and the heat generated by passing current through the coil 15 and the heat transmitted from the heated steel plate at the bottom are released through the ventilation outlet 21.

Further, the terminal 18 to which the coil 15 is connected is connected to a high frequency power source 24, which is an example of an AC power source, via the operation section 23.
When the operation part 23 is operated, a high frequency current is passed through the coil 15, and the surface of the steel plate 12 that the coil 15 is in contact with is heated.

A compressed air injection flange 25, which is an example of a gas injection device, is fixedly disposed at the center of the induction heating coil 13, and a gas injection port is provided at the center of the compressed air injection flange 25. An air inlet 26, which is one example, is connected to an air pressure source 27 via an operating section 23, and compressed air is injected into the air inlet 26 in response to a command signal from the operating section 23.

By the way, an embodiment of the second invention using the above-mentioned induction heating coil 13 will be explained below.
A part of the lining material 10 on the surface of the lining material 10 is peeled off in a circle with a hammer or the like, and the induction heating coil 13 is placed on the peeled part so that the outlet 26a of the air inlet 26 is oriented (as shown in FIG. 1). .

In this case, if the flange surface of the compressed air injection flange 25 and the contact surface with the lining material 10 are not sealed, air will leak, so if necessary, apply a rubber-like or semi-liquid heat-resistant sealant to the gap. It is preferable to fill it up.

Thereafter, the operating section 23 is operated to cause a high frequency current to flow through the coil 15, thereby inductively heating the steel plate 12. As a result, the surface of the steel plate 12 is heated, the primer material 11 or the lining material IO is softened by the heat, and its adhesive strength is reduced. On the other hand, since the lining material 10 is not easily softened by heat, the lining material 10 applied to the surface of the steel plate 12 eventually comes to float. Therefore, when compressed air is injected into the air inlet 26 by operating the operating section 23, the air is transmitted between the lining material 10 and the steel plate 12, and the lining material is peeled off from the steel plate.

It is assumed that the coil 15 is sufficiently cooled by the above-mentioned fan (not shown).

In addition, as shown in FIG. 1, a thermocouple 28 is disposed on the surface of the steel plate 12 to measure the surface temperature of the induction-heated steel plate, and when the temperature reaches a predetermined temperature, the operation part 23 is activated. It is also possible to operate to inject compressed air into the air inlet 26, and by doing so, the lining material can be automatically peeled off. In addition, the thermocouple 2
It is also possible to feed back the output of 8 to a control device (not shown) of the high frequency power source 27, thereby allowing the steel plate 1 to
It is also possible to control the heating temperature of the surface of 2 to be constant. By controlling the surface of the steel plate to a constant heating temperature in this way, it is possible to prevent the lining material 10 and the primer material 11 from overheating, and furthermore, there is no need to consume unnecessary power. Regarding the lining material peeling method according to one embodiment of the invention, differences from the lining material peeling method according to the second embodiment of the invention will be explained.

In the lining material peeling method according to the embodiment of the first invention, only the induction heating coil 13 is used in contact with the steel plate 12 to be treated, and the compressed air injection flange 2
5 is not used. That is, depending on the type of primer or lining material, it may easily peel off from the metal surface by applying heat, so in this case, the lining material may be peeled off by gravity or by using a suitable scraper. Therefore, there is no need to inject compressed air into the lower part of the lining material to separate the lining material.

Also, depending on the type of primer material and lining material,
Some lining materials may crack and peel off from the steel plate by applying heat, and in this case, the lining material can be easily peeled off using the above-mentioned scraper.

Therefore, the lining material peeling method according to the first invention is as follows:
Since this can be obtained by omitting the step of injecting compressed air in the lining material peeling method according to the second invention, detailed explanation will be omitted.

In the lining material peeling method according to the embodiments of the first and second inventions, the induction heating coil 13 is wound in a circular shape, but it is also possible to wind the coil in a square or rectangular shape. This makes it possible to perform the stripping work efficiently when stripping a wide area of lining material.

Further, in the above embodiment, the coil is cooled using cooling fins and a fan, but it is also possible to use a hollow copper wire for the coil and cool it by flowing water inside.

Furthermore, although the above embodiment describes a method for peeling off the lining material, the lining material can be replaced with a thick film coating material and applied using the same procedure.

〔Effect of the invention〕

As is clear from the above description, the methods for peeling off lining materials and thick film coating materials according to the first and second inventions include:
Using the SA i heating coil, in order to strengthen the adhesion strength of the lining material, the adhesion strength of the primer material or thick film coating material applied on the metal object is reduced, and the lining material or Since the thick film coating material is being peeled off from the metal object, the process can be performed extremely efficiently.

In particular, in the method for peeling off the lining material and thick film coating material according to the second invention, the lining material or the thick film coating material is removed by blowing gas into the lower part of the lining material or the thick film coating material. The lining material or thick film coating material can be removed efficiently without the need for it.

In addition, this process is different from hammer work, etc. in that a fixed area can be removed at the same time, so it is possible to remove unevenly the lining material or thick film coating material applied to the surface of the metal object. Since the above-mentioned work can be performed automatically, by applying it to other automatically operated machines, it becomes possible to perform the operation automatically according to the situation of the object to be processed.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing a state in which a method for removing a lining material according to an embodiment of the method for removing a lining material and a thick film coating material according to the second invention is being carried out; A plan view of the induction heating coil used in this lining material peeling method, FIG. 3 is taken along A-A in FIG.
It is an arrow sectional view. [Explanation of symbols]

Claims (2)

[Claims] (1) Attach an induction heating coil to the metal object coated with the lining material or thick film coating material to be removed, and heat at least the surface of the metal object by flowing an alternating current through the induction heating coil. , a lining material characterized in that the lining material or thick film coating material is peeled off by heating the adhesion part of the primer material or thick film coating material that reinforces the adhesion strength of the lining material to weaken the adhesion strength; How to remove thick film coating material. (2) Attach an induction heating coil to the metal object coated with the lining material or thick film coating material to be removed, and attach the above lining material or thick film coating material located inside the induction heating coil to the After providing a gas injection hole that reaches the metal object, alternating current is passed through the induction heating coil to heat at least the surface of the metal object, and gas is injected through the gas injection hole to heat the lining material or thick film. A method for peeling lining materials and thick film coating materials, which comprises filling an intermediate portion between the coating material and the metal object with gas to separate the lining material or thick film coating material from the metal object.