JPH09253871A - Ignitor for welding to ignite thermite mixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ignitor for welding to ignite the thermite mixture capable of suppressing jumping of a covering plug. SOLUTION: An ignitor 20 for welding to ignite the thermite mixture is provided with a bottomed cylindrical body 21 in which the firing agent and the igniting agent are charged, a covering plug to be caulked on an opening side of the cylindrical body, a bridging wire 31 which is fitted to the covering plug and embedded in the igniting agents 23, 24, and a terminal cable to be communicated with the bridge wire 31 through the covering plug. In the cylindrical body 21, a small hole 25 for gas relief is cut in a part to which the igniting agents 23, 24 are charged, and the small hole 25 for gas relief is covered by a closing member which is fractured when the pressure in the beginning of the ignition reaches the specified value below the mechanical bonding between a caulked part 28 and the covering plug of the cylindrical body 21. The small hole for gas relief is cut closer to the firing agent 22 to the bridging wire 31, two kinds of igniting agents 23, 24 are charged therein, and the small hole for gas relief is cut at the position of the igniting agent close to the bridging wire 31. The covering member is a tape.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a welding ignition for igniting a thermite agent used for welding a rod-shaped, plate-shaped, pipe-shaped or linear-shaped piece of non-ferrous metal such as aluminum, aluminum alloy or copper. It is about ingredients.

[0002]

2. Description of the Related Art Conventionally, a heating agent for welding rods, plates, pipes, linear fragments of non-ferrous metals such as aluminum, aluminum alloys, copper, etc., or single or stranded wires of electric conductors of non-ferrous metals with thermite reaction heat. For example, Japanese Patent Laid-Open No.
What is disclosed in Japanese Unexamined Patent Publication No. 8-34049 is known.

In these welding methods, a redox agent (thermite agent) capable of producing a high temperature metal melt by a thermite reaction is ignited by a welding igniter. FIG. 2 shows an example of the welding igniter 10. This welding igniter 10 includes an igniting agent 2 and igniting agents 3, 4
And a bottomed tubular body 1 filled with and an opening 1a of the tubular body 1.
It is composed of an embolus 5 attached to the side, an electric bridge wire 6 attached to the embolus 5 and embedded in the ignition agent 4, and a leg wire 7 that penetrates the embolus 5 and communicates with the electric bridge wire 6. .

A caulking portion 1b is formed in the opening 1a of the cylindrical body 1 to mechanically connect the cylindrical body 1 and the embolus 5.
The welding igniter 10 is, as shown in FIG.
The welding device 8 is inserted into the insertion port 8a provided on the side surface. At this time, the welding igniter 10 is not fixed by a special fixing tool. In the figure, 9 represents a thermite agent.

[0005]

By the way, in the conventional welding igniter 10, when the igniting agent 4 is ignited by the bridge wire 6, gas is generated and the pressure in the cylindrical body 1 rapidly rises. Since the mechanical coupling force between the caulked portion 1b of the tubular body 1 and the embolus 5 is more than the mechanical coupling force, the embolus 5 may pop out, which may delay the transfer of the ignition agent 2 or cause poor ignition. Here, at the initial stage of ignition, the internal pressure rises and the embolus flies at a static load value of about 60 kgf.

On the other hand, if the mechanical coupling force between the caulking portion 1b of the tubular body 1 and the embolus 5 is strong, the welding igniter 10 may fly out of the insertion opening 8a instead of the embolism 5 due to the internal pressure of the tubular body 1. The present invention has been made to solve such conventional problems, and an object thereof is to provide a welding igniter for igniting a thermite agent capable of suppressing the protrusion of an embolus.

[0007]

According to a first aspect of the present invention, a bottomed cylindrical body filled with an igniting agent and an igniting agent, an embolus crimped on an opening side of the cylindrical body, and an embolus attached to the embolus are attached. In a welding igniter for igniting a thermite agent having an electric bridge wire embedded in an igniting agent and a leg wire inserted through an embolus and communicating with the electric bridge wire, a tubular body is provided at a portion filled with the igniting agent. A small hole for degassing is bored, and the small hole for degassing is closed by a sealing member that breaks when the pressure at the initial stage of ignition becomes a predetermined value below the mechanical connection between the caulking portion of the cylinder and the embolus. It is characterized by being peeled off.

According to a second aspect of the present invention, in the welding igniter for igniting the thermite agent according to the first aspect, the degassing small hole is formed closer to the ignition agent than the bridge line. It is a feature. The invention of claim 3 is claim 1
In a welding igniter for igniting the thermite agent described,
It is characterized in that it is filled with two kinds of igniting agents, and that a small hole for degassing is formed at a position of the igniting agent near the bridge line.

According to a fourth aspect of the present invention, in the welding igniter for igniting the thermite agent according to the first aspect, the blocking member comprises:
It is characterized by being a tape.

(Operation) In the inventions of claims 1 to 4, when the ignition wire is ignited by the bridge wire, gas (including heat particles) is generated, and the pressure in the cylinder rapidly rises.
When the pressure reached a predetermined value (a static load value of about 60 kgf or less, a static load value of about 15 kgf) below the mechanical coupling force between the caulked portion of the cylinder and the embolus, gas was perforated into the cylinder. The sealing member that closes the small hole for degassing is broken to reduce the internal pressure. As a result, it is possible to prevent the emboli from popping out at the beginning of ignition.

On the other hand, the igniting agent continues to burn and transfers the igniting agent, and the combustion of the igniting agent causes the flame to break the cylinder and ignite the thermite agent of the welding apparatus. Further, the gas that breaks the sealing member scatters into the heating agent to assist ignition.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to the embodiments shown in the drawings.

FIG. 1 shows an embodiment of a welding igniter for igniting the thermite agent according to any one of claims 1 to 4. In the figure, 21 is an igniting agent 22 and an igniting agent 23, 24.
It is a bottomed cylinder made of aluminum filled with and.
The cylindrical body 21 is provided with two small holes 25 for degassing at a portion filled with the ignition agent 24.

The small hole 25 for degassing is closed by attaching a tape 26 as a blocking member from the outside of the cylindrical body 21. This tape 26 is igniter 2
It is softened by the gas generated by the combustion of 3, 24,
As the pressure inside the tubular body 21 rapidly increases, when the pressure reaches a predetermined value below the mechanical coupling force between the caulking portion 28 provided on the opening 27 side of the tubular body 21 and the embolus 30, the one that breaks is used. Has been done.

Here, polytetrafluoroethylene (registered trademark Teflon) is used as the tape 26. In the igniter used in the present embodiment, the pressure when the internal pressure rises and the embolus 30 flies at the beginning of ignition is similar to that of the conventional igniter.
It is about 60 kgf under static pressure. On the other hand, the predetermined value at which the tape 26 that closes the small holes 25 for degassing is broken is about 15 kgf under static load.

The ignition agent 22 is made of Al (AB-170).
0) 40 wt%, Fe ₃ O ₄ 29 wt%, BaCrO ₄ 3
1 wt% and 1 wt% of rubber (Bind A) in the outer ratio. Further, the igniting agent 23 is B10 wt%, BaCr
90% by weight of O ₄ and 1 w of rubber (Viton A)
It consists of t%.

Further, the igniting agent 24 is B10 wt%, Ba
Rubber (Viton A) 1 with CrO ₄ 90 wt% and outer ratio
It consists of wt%. On the other hand, the embolus 10 is mechanically coupled by a caulking portion 28 formed on the opening 27 side of the tubular body 21. An electric bridge wire 31 embedded in the ignition agent 24 is attached to the plug 30.

A leg wire 32 is inserted through the embolus 30, and the curve 32 communicates with the bridge line 31. The leg wire 32 communicates with the power source via a switch (not shown). Next, the operation of the present embodiment will be described. The welding igniter 20 for igniting the thermite agent according to the present embodiment is
Like the conventional device shown in FIG. 3, it is inserted into the insertion opening of the welding device.

During welding, when a worker turns on the switch, the bridge wire 31 generates heat, and the heat ignites the igniter 24 covering the bridge wire 31. As a result, gas is generated and the pressure inside the cylinder 21 rises sharply. When the pressure reaches a predetermined value (about 15 kgf by static load in this embodiment) below the mechanical coupling force between the caulked portion 28 of the opening 27 of the cylinder 21 and the embolus 30, the gas penetrates into the cylinder 21. The tape 26 adhered to the outside of the provided small hole 25 for degassing is torn and then to the outside, and the internal pressure of the tubular body 21 is reduced. As a result, the embolus 3 at the beginning of ignition
It is possible to prevent the jumping out of zero. That is, the gas pressure at the initial stage of ignition increases within a short period of time to blow the embolus 30 (about 60 kgf under static load). Predetermined value (mechanical load of approximately 15 k
gf), the tape 2 covering the small hole 25 for degassing
Since 6 breaks and the rapid increase of the internal pressure is suppressed, it is not necessary to blow the embolus 30 by the internal pressure as in the conventional case.

Therefore, since the electric bridge wire 31 does not separate from the igniting agent 24, the igniting agent 24 continues to burn and can be transmitted to the next igniting agent 23 and the igniting agent 22. As described above, in the present embodiment, the tubular body 21 is the ignition agent 24.
Since a small hole 25 for degassing is formed in the portion filled with, and the small hole 25 for degassing is closed with the tape 26, the embolus 30 does not pop out at the initial stage of ignition. It can be surely prevented.

Particularly, the small hole 25 for degassing is formed by the bridge line 3
Since it is provided closer to the ignition agent 22 than No. 1, it is possible to delay a slight time without directly receiving an increase in gas pressure. That is, when the small hole 25 for venting gas is provided in a portion near the embolus 30 where the ignition agent 24 is not filled, the generated gas pressure is directly received, so that the strength of the tape 26 is increased.
When the predetermined value is lower than the mechanical coupling force between the caulked portion 28 of the opening 27 and the embolus 30, the breakage of the tape 26 occurs faster than that of FIG. 1, and the transfer of the ignition agent 24 to the ignition agent 23 is prevented. It will be.

Further, the small hole 25 for degassing has the igniter 2
If it is provided in a portion filled with 3, the gas cannot be vented at the initial stage of ignition, so that the embolic plug 30 cannot be prevented from jumping out as in the conventional case. In the above embodiment, the case where two small holes 25 for venting gas are provided has been described, but it is possible to increase the number, but in that case, it is necessary to consider the cross-sectional area of the embolus. There is.

In the above embodiment, the tape 26 of the sealing member is made of polytetrafluoroethylene (Teflon).
Although it was attached to the outside of the tubular body 21 by using, it may be attached to the inside of the tubular body 21. As a blocking member, a resin may be filled in the small hole 25 for degassing instead of the tape 26.

[0024]

As described above, according to the invention described in claims 1 to 4, it is possible to suppress a rapid pressure increase at the initial stage of ignition of the igniting agent by the bridge wire, so that the embolus can be removed. It can be reliably prevented, the ignition performance can be improved, and the gas scattered from the small holes can play an auxiliary role of the heating agent ignition.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a welding igniter for igniting a thermite agent according to any one of claims 1 to 4.

FIG. 2 is a cross section showing a welding igniter for igniting a conventional thermite agent.

FIG. 3 is a cross-sectional view showing a state in which a welding igniter for igniting a conventional thermite agent is attached to a thermite agent welding device.

[Explanation of Codes] 20 Welding igniter for igniting thermite agent 21 Cylindrical body 22 Ignition agent 23, 24 Ignition agent 25 Small hole for degassing 26 Tape as a sealing member 27 Opening portion of the cylindrical body 28 Caulking portion 30 Embolus 31 Denbashi Line 32 Leg

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshimitsu Sato Fukushima Nishishirakawa-gun Saigo-mura Osamu Nagasaka character 2 No. 1 NIPPON KOKI CO., LTD.

Claims (4)

[Claims] 1. A bottomed cylinder filled with an igniting agent and an igniting agent, an embolus crimped on the opening side of the cylinder, and an electric bridge wire attached to the embolic and embedded in the igniting agent. In a igniter for igniting a thermite agent having a leg connecting with an electric bridge line through an embolus, a tubular body is provided with a small hole for venting gas at a portion filled with the igniting agent. In the small hole for extraction, a thermite agent characterized by being blocked with a blocking member that breaks when the pressure at the initial stage of ignition becomes a predetermined value below the mechanical coupling force of the caulking portion of the cylinder and the embolus. Welding igniter for ignition. 2. A welding igniter for igniting a thermite agent according to claim 1, wherein the gas venting small hole is formed closer to the ignition agent than the bridge line. Ignition tool for welding. 3. The welding igniter for igniting the thermite agent according to claim 1, wherein two kinds of igniting agents are filled, and the small hole for degassing is located at the position of the igniting agent near the bridge line. A welding igniter for igniting a thermite agent characterized by being drilled. 4. The welding igniter for igniting the thermite agent according to claim 1, wherein the sealing member is a tape.