JP2022177720A - Igniter for oxygen fusion cutting lance pipe - Google Patents

Abstract

To provide an igniter for an oxygen fusion cutting lance pipe including a substrate that is less likely to be broken even when the number of ignition works is repeated, suppressing thermal conduction and having excellent safety.SOLUTION: An igniter 1 includes: a substrate 10 made of a wooden material; a base material 20 installed at a bottom surface of a cylindrical body fitting hole 12 bored in the substrate; a cylindrical body 30 installed on the base material; and a combustion material 43 inserted into the cylindrical body. The base material 20 and the cylindrical body 30 are made of a material having fire-retardant property that is higher than that of a wooden material. The base material 20 holds and fixes a lower end part of the cylindrical body 30 so as to cause a space W to be generated between an outer peripheral surface of the cylindrical body 30 and an inner peripheral surface of the cylindrical body fitting hole 12.SELECTED DRAWING: Figure 2

Description

The present invention relates to an igniter for an oxygen-fused lance pipe. In this specification, the "oxygen-fused lance pipe" is also simply referred to as the "lance pipe".

Conventionally, when cutting or drilling a target material (thick steel material, etc.) that is difficult to cut by gas cutting or mechanical cutting, oxygen cutting equipment is used for cutting.
In the oxygen fusing device, a heat source above a certain level is applied from the outside to the tip of a metal lance pipe having an oxygen channel inside to melt and ignite the lance pipe, and the lance pipe is fed into the oxygen channel. This is a fusing device that continuously causes an oxidation reaction with oxygen and a lance pipe to cause self-combustion, and cuts or perforates a target material (object to be fused) by the oxidation reaction heat at the tip of the lance pipe.

As a technique for igniting the tip of the lance pipe in such an oxygen fusion cutting apparatus, Patent Document 1 discloses that the tip of the lance pipe is attached to an appropriate igniting material base mainly made of wood, compressed paper, or the like. An insertion hole for ignition is provided, and a combustion material for ignition made by solidifying metal powder mainly composed of iron with a binder such as lining or resin is inserted for ignition so that the lance pipe insertion space remains near the opening. An ignition material for an oxygen lance pipe characterized by being embedded in a hole", and "Oxygen from an oxygen cylinder is supplied into the lance pipe through a hose and is ejected from the tip of the lance pipe, and the lance The tip of the pipe is inserted into the insertion hole for ignition of the ignition material substrate mainly made of wood or compressed paper, and the ignition source is appropriately put into the insertion hole for ignition. The returning oxygen moving through the gap between the outer surface of the pipe and the inner wall surface of the insertion hole for ignition toward the opening of the insertion hole for ignition burns the inner wall portion of the insertion hole for ignition of the ignition material substrate, thereby burning the inner wall portion of the insertion hole for ignition. In the primary combustion by combustion, an ignition combustion material made by solidifying metal powder mainly composed of iron preliminarily embedded in the ignition insertion hole with a binder such as lining or resin is burned, and this ignition combustion material is burned. A method of igniting an oxygen lance pipe characterized in that the tip portion of the lance pipe in the ignition insertion hole is caused to burn by secondary combustion with a large amount of heat generated by combustion.

However, since the ignition material of Patent Document 1 is based on the assumption that the ignition material substrate is primarily burned, the shape of the ignition material substrate collapses every time the ignition operation is repeated, which not only interferes with the ignition operation, In some cases, the flames may flare up violently, and for the safety of the surroundings, it is necessary to extinguish the fire (spray water, cut off oxygen, etc.) each time. In addition, after the ignition work is completed, the shape of the ignition material substrate may be damaged, and it may be difficult to carry.

On the other hand, in Patent Document 2, the inventors of the present invention have proposed an igniter that does not presuppose primary combustion of the substrate. According to this igniter, damage and combustion of the substrate can be greatly suppressed as compared with the above-mentioned Patent Document 1. However, even in this igniter, when a large number of igniting materials inserted into the base are used, the base is carbonized by the heat of the igniting material, and reacts with the oxygen blown from the tip of the lance pipe and the flame at the time of ignition. , the substrate may be damaged or a flame may be raised.

Japanese Patent No. 3541393 Japanese Patent No. 6744682

The problem to be solved by the present invention is to provide an igniter for an oxygen-fused lance pipe that is resistant to damage to the base even if the number of times of ignition work is repeated, and that suppresses heat conduction and is excellent in safety.

According to one aspect of the present invention, the following igniter for an oxygen-fused lance pipe is provided.
A substrate made of wood, a base material installed on the bottom surface of a cylinder mounting hole provided in the substrate, a cylinder installed on the base material, and a combustion material inserted into the cylinder. An igniter for an oxygen-fused lance pipe, comprising:
The base material and the cylindrical body are made of a material that is more incombustible than wood,
The base material holds or fixes the lower end of the cylindrical body so that a gap is formed between the outer peripheral surface of the cylindrical body and the inner peripheral surface of the cylindrical body mounting hole. igniter.

According to the present invention, there is a gap between the outer peripheral surface of the cylindrical body into which the combustible material is inserted and the inner peripheral surface of the cylindrical body mounting hole in which the cylindrical body is mounted. Since the base material made of a non-combustible material is installed, the heat generated by burning the combustible material is less likely to be transmitted to the base during the ignition work. Therefore, even if the number of ignition operations is repeated, the substrate is less likely to be damaged. Furthermore, since the substrate is made of wood, heat conduction can be suppressed and safety is excellent.

1 is a perspective view of an igniter for an oxygen-fused lance pipe according to an embodiment of the present invention; FIG. AA sectional view of FIG. Photographs showing the results of repeated ignition tests (appearance of the igniter after the test) using the igniter of FIG. 1 and the igniter disclosed in Patent Document 2 (the left side is the igniter of FIG. vessel.).

FIG. 1 is a perspective view of an oxygen-fused lance pipe igniter (hereinafter simply referred to as "igniter") 1, which is an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along line AA of FIG.
The igniter 1 of this embodiment includes a base 10 , a base material 20 , a tubular body 30 and an ignition material 40 .
The base 10 is made of wood, and has a heptahedral shape with a side of about 100 mm. A cylinder mounting hole 12 having a diameter of about 60 mm and a depth of about 60 mm is provided in the inclined surface 11 . The depth direction of the cylinder mounting hole 12 is perpendicular to the inclined surface 11 . Further, the base 10 is provided with a notch 13 that continues to the lower portion of the cylindrical body mounting hole 12 .

The base material 20 is made of a material that is more incombustible than wood, and is installed on the bottom surface of the cylinder mounting hole 12 as shown in FIG. In this embodiment, the base material 20 is made of mortar, and the lower end of the cylinder 30 is fixed so that a gap W of a predetermined width is formed between the outer peripheral surface of the cylinder 30 and the inner peripheral surface of the cylinder mounting hole 12 . is doing.

The cylindrical body 30 is made of a material that is more incombustible than wood and is mounted in the cylindrical body mounting hole 12 . In this embodiment, the cylindrical body 30 is made of brass, and by fixing the lower end of the cylindrical body 30 with the base member 20 as described above, a gap between the outer peripheral surface of the cylindrical body 30 and the inner peripheral surface of the cylindrical body mounting hole 12 is formed. It is mounted in the cylindrical body mounting hole 12 so that a gap W of a predetermined width is created between the two. The cylindrical body 30 has a diameter (outer diameter) of about 55 mm and a height of about 70 mm. On the other hand, as described above, the cylindrical body mounting hole 12 has a diameter (inner diameter) of about 60 mm and a depth of about 60 mm. Therefore, in this embodiment, the width of the gap W between the outer peripheral surface of the tubular body 30 and the inner peripheral surface of the tubular body mounting hole 12 is about 2.5 mm, and the upper end of the tubular body 30 is the inclined surface 11 ( It protrudes about 10 mm from the surface of the substrate 10).

The ignition material 40 has substantially the same configuration as the ignition material disclosed in Patent Document 2, and includes an outer peripheral material 41 , a bottom material 42 and a combustion material 43 .
The outer peripheral member 41 is formed of coal briquette in a cylindrical shape and has a through hole 41a into which the tip portion of the lance pipe can be inserted. In this embodiment, the diameter of the through hole 41a (the inner diameter of the cylindrical outer member 41) is about 20 mm, but depending on the outer diameter of the lance pipe to be used (generally about 10 to 20 mm), the lance pipe The size should be such that the tip of the device can be inserted. The outer diameter of the outer peripheral member 41 is slightly smaller than the inner diameter of the cylindrical body 30, and the height of the outer peripheral member 41 is lower than the height of the cylindrical body 30 by about 10 mm. The height position of the upper end surface of the outer peripheral member 41 is the same as or slightly lower than the height position of the upper end of the cylindrical body 30 .

The bottom material 42 is made of a material that is more incombustible than the coal briquette and closes the lower end of the through hole 41a. In the present embodiment, the bottom material 42 is iron powder hardened with an inorganic binder (sodium silicate aqueous solution), and is inserted into the lower end of the through hole 41a to block the lower end of the through hole 41a. Alternatively, the bottom member 42 may be made to have approximately the same size as the outer diameter of the outer peripheral member 41, and the bottom member 42 may be adhered (joined) to the lower end surface of the outer peripheral member 41 to close the lower end of the through hole 41a. Examples of materials that are more incombustible than molded charcoal include iron plates, stainless steel plates, brass plates, iron powder or stainless steel powder hardened with an inorganic binder, and the like.

The combustion material 43 is mainly composed of pulverized coal and is inserted into the through hole 41a. The combustible material 43 may contain metal powder such as iron powder in addition to pulverized coal, which is the main component. The content of pulverized coal, which is the main component, is preferably 80% by mass or more. In this embodiment, the combustible material 43 is inserted into the through-hole 41a so that a space into which the tip of the lance pipe can be inserted remains near the upper end opening of the through-hole 41a. , oiled paper, oiled cloth or the like is inserted.

Next, a method of igniting the lance pipe with the igniter 1 of this embodiment will be described. The method of igniting the lance pipe with this igniter 1 is the same as the method of igniting the lance pipe with the igniter disclosed in Patent Document 2. Therefore, reference is made to Patent Document 2 for details, and only the outline thereof will be described below.
At the first ignition, the igniting material 44 is ignited and used as an ignition source. Subsequently, the tip of the lance pipe is brought close to the upper end opening of the through hole 41a. Then, an oxidation reaction occurs between the oxygen supplied from the tip of the lance pipe and the spark. When the tip of the lance pipe is inserted into the through hole 41a while supplying oxygen from the tip of the lance pipe, intense combustion occurs between the combustible material 43 mainly composed of pulverized coal and the tip of the lance pipe. The tip of the pipe melts and ignites. In the second and subsequent ignitions, the slag that has settled on the bottom of the outer peripheral member 41 is remelted, and the heat of melting ignites the lance pipe.

According to the igniter 1 of the present embodiment, even if the number of ignition operations is repeated in this way, the outer peripheral surface of the cylinder 30 into which the ignition material 40 (combustion material) is inserted and the cylinder mounting hole 12 into which the cylinder 30 is mounted are maintained. The base material 20 made of mortar, which is more difficult to burn than wood, is placed on the bottom surface of the cylindrical body mounting hole 12. Heat generated by combustion of the material 40 (combustion material) is less likely to be transmitted to the base 10 . Therefore, the substrate 10 is less likely to be damaged even if the number of ignition operations is repeated. Furthermore, since the substrate 10 is made of wood, heat conduction can be suppressed and safety is excellent. Although the width of the gap W is about 2.5 mm in the present embodiment, the width is not limited to this, and can be, for example, 2 mm or more and 5 mm or less. That is, from the viewpoint of making it difficult for heat to be conducted to the base 10, the width of the gap W is preferably large. The width of the gap W should not be too large, because problems may occur.

In addition, in the present embodiment, since the upper end of the cylindrical body 30 protrudes from the inclined surface 11 (surface of the base 10), heat generated by combustion of the ignition material 40 (combustion material) is less likely to be transmitted to the base 10 during ignition work. In this embodiment, the projection length of the upper end of the cylindrical body 30 is about 10 mm, but it is not limited to this, and can be, for example, 5 mm or more and 15 mm or less. That is, from the viewpoint of making it difficult for the heat generated by the combustion of the ignition material 40 (combustion material) to be transmitted to the base 10 during the ignition work, the projection length of the upper end of the cylindrical body 30 is preferably longer. If the length is increased, the cylindrical body 30, which becomes hot during the ignition work, is exposed to a large extent. Therefore, considering safety and portability, it is preferable that the projection length of the upper end of the cylindrical body 30 is not too long.

Furthermore, in the present embodiment, the base 10 is provided with the notch 13 that is continuous with the lower portion of the cylinder mounting hole 12, so that the heat generated by burning the ignition material 40 (combustion material) is less likely to be transmitted to the base 10 during ignition work. Become. That is, since the notch 13 expands the gap W (space) below the cylindrical member mounting hole 12 , heat is less likely to be conducted to the base 10 below the cylindrical member mounting hole 12 .

Although the base material 20 is mortar in this embodiment, it is not limited to this, and any material that is more incombustible than wood may be used. Examples of materials that are more incombustible than wood and that can be used as the base material 20 include mortar, iron plates, stainless steel plates, brass plates, ceramic plates, and other plate materials. A holding portion may be provided to hold the lower end portion of the cylindrical body 30 by the holding portion. However, from the viewpoint of securely and easily holding and fixing the cylindrical body 30, it is preferable to fix the lower end portion of the cylindrical body 30 with mortar as in the present embodiment. In addition, since mortar is excellent in heat resistance and heat insulation, it is also preferable from the viewpoint of making it difficult for heat to be conducted to the bottom surface of the cylindrical body mounting hole 12 .

Also, in the present embodiment, the material of the cylindrical body 30 is brass, but it is not limited to this, and any material that is more flame-retardant than wood may be used. Materials that are less combustible than wood and can be used for the cylindrical body 30 include brass, metals such as iron and stainless steel, and ceramics. However, considering the heat dissipation from the gap W (space) around the cylindrical body 30, it is preferable to use metal such as brass as in the present embodiment. In addition, since metal is easy to process into a cylindrical body and is inexpensive, it is also preferable from the point of view of economy.

Furthermore, in this embodiment, the combustion material 43 is inserted into the cylinder 30 as part of the ignition material 40 , but the combustion material 43 may be directly inserted into the cylinder 30 . Also, the combustible material 43 is not limited to one mainly composed of powdered coal, and various combustible materials such as metal powder solidified with a binder as disclosed in Patent Document 1 can be used. When the combustible material is directly inserted into the cylindrical body 30, the combustible material may be inserted into the cylindrical body 30 each time the ignition work is performed.

As an example of the present invention, ignition work was repeatedly carried out using the igniter 1 shown in FIG. Further, as a comparative example, the ignition work was repeatedly carried out using the igniter disclosed in Patent Document 2. The material of the substrate was wood in both the examples and the comparative examples.

In the example, 25 ignition materials were used, and the ignition operation was repeated nine times with each ignition material. Specifically, the ignition operation is repeated nine times with the first ignition material, then the first ignition material is removed from the base, the second ignition material is inserted into the base, and the ignition operation is repeated nine times. repeated. This was repeated up to the 25th ignition material.

On the other hand, in the comparative example, five ignition materials were used, and the ignition operation was repeated nine times with each ignition material. Specifically, the ignition operation is repeated nine times with the first ignition material, then the first ignition material is removed from the base, the second ignition material is inserted into the base, and the ignition operation is repeated nine times. repeated. This was repeated up to the fifth ignition material.

FIG. 3 shows the appearance of the igniter after the test (example on the left, comparative example on the right). As shown in FIG. 3, 25 ignition materials were used in the igniter of the example, and no damage or combustion was observed in the substrate 10 even after the test in which the ignition operation was repeated nine times with each ignition material. On the other hand, in the igniter of the comparative example, charring was observed in the substrate 10 after the test, and immediately after the ignition operation using the fifth ignition material, although it was slight, a phenomenon in which flames rose from the substrate 10 was observed. rice field.

REFERENCE SIGNS LIST 1 igniter 10 substrate 11 inclined surface 12 cylindrical body insertion hole 13 notch 20 base material 30 cylindrical body 40 ignition material 41 outer peripheral material 41a through hole 42 bottom material 43 combustion material 44 igniter material

Claims (4)

A substrate made of wood, a base member installed on the bottom surface of a cylinder mounting hole provided in the substrate, a cylinder installed on the base member, and a combustion material inserted into the cylinder. An igniter for an oxygen-fused lance pipe, comprising:
The base material and the cylindrical body are made of a material that is more incombustible than wood,
The base material holds or fixes the lower end of the cylindrical body so that a gap is formed between the outer peripheral surface of the cylindrical body and the inner peripheral surface of the cylindrical body mounting hole. igniter. 2. The igniter for an oxygen-fused lance pipe according to claim 1, wherein the upper end of said cylindrical body protrudes from the surface of said base. The base has a sloped surface that slopes downward, the cylinder mounting hole is provided in the slope, and the base is provided with a notch that continues to the lower part of the cylinder mounting hole. An igniter for an oxygen-fused lance pipe according to claim 1 or 2. The igniter for an oxygen-fused lance pipe according to any one of claims 1 to 3, wherein the base material is made of mortar, and the cylinder is made of metal.

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