JP2968880B2 - Method of welding connection between lead pin penetration plug and electric bridge element - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for welding a lead pin penetration plug and a bridge element by welding, and is useful when a bridge element is bridged between the tip of a lead pin of an embolus of an electric detonator ignition part. It is something.

[0002]

2. Description of the Related Art An electric detonator uses, as an ignition member, an electric plug element in which an electric bridge element is bridged by welding between the tip of a lead pin of an embolus having a pair of lead pins penetrating an insulating plug. The charging agent, the priming agent, and the igniting agent are sequentially loaded from the back into the metal cylinder body having one end opening, and the plug with the electric bridge element is attached to one end opening of the cylindrical body, and the electric bridge element is connected with the igniting agent. , And an end of the cylinder is sealed with the plug to form an electric detonator.

In the above electric detonator, if the hermetic fixation between the embolus and the lead pin is poor, the ignitability of the igniter is reduced by moisture absorption, or the lead pin is moved by the movement of the lead pin. Unexpected ignition of the priming due to friction between the priming and the priming leads to explosion, or at the time of ignition ignition, the lead pin comes off and the blast pressure leaks, and the bottom of the cylinder cannot be destroyed. Serious obstacles, such as the inability to carry out the blasting.

In order to join the above-mentioned bridge element to a lead pin, conventionally, as shown in FIG. 3, a bridge element 5 'is positioned on a tip end face 20' of a lead pin 2 ', and the tip of the lead pin is formed. Electric bridge element part 5 at end face location 20 '
The electrodes 61 'and 62' of the resistance welding machine are brought into contact with 0 'and the rear end face 20 "of the lead pin, and these electrodes 61' and 62 '.
The welding current is passed through.

[0005]

However, in the above joining method, a welding current flows through the entire lead pin, and the entire lead pin becomes considerably high due to the heat generated by the joule. Thermal stress is generated at the interface due to the difference in thermal expansion coefficient between the two, and the interface is peeled off, making it difficult to secure sufficient airtight fixing of the lead pin to the plug.

It is an object of the present invention to provide an airtight fixation between a lead pin and a plug when an electric bridge element is joined by a resistance welding method between tips of the lead pins of the plug having the lead pin passed therethrough. It is an object of the present invention to provide a method for welding and joining a lead pin penetration plug and an electric bridge element, which makes it possible to carry out this joining while holding the wire well.

[0007]

SUMMARY OF THE INVENTION According to the present invention, there is provided a method for welding a lead pin penetrating plug to an electric bridge element by welding the electric bridge element to an outer surface of a lead pin penetrating plug body. With the end positioned, one electrode of the resistance welding machine is brought into contact with the bridge element location in contact with the outer surface of the lead pin tip, and the other electrode is connected to a lead other than the bridge element location.
The structure is characterized in that the lead pin and the bridge element are directly contacted with the outer surface of the tip of the doping pin, and a welding current is applied through these two electrodes to weld the lead pin and the bridge element.

[0008]

The path of the welding current at the lead pin is between the lead pin tip where it contacts the electric bridge element and a lead pin tip that is different from this point, and contacts the plug. Since the welding current does not flow through the lead pin portion, the occurrence of thermal stress at the interface between the lead pin and the plug during welding can be eliminated well, and the separation at the interface can be prevented well.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an embolus used as an ignition member of an electric detonator, and an insulating plug 1, for example, a hole 1 of a ceramic plug.
The lead pins 2 and 2 are inserted into the plugs 1 and 11, and the front end surface of the lead pin 2 and the front surface of the plug 1 are substantially flush with each other.
A metal inner cylinder 3 is fitted into the inner cylinder 3, and a sealing glass 4
Is loaded. Reference numeral 5 denotes an electric bridge element joined to the end faces of the lead pins 2 and 2 by welding.

[0010] As shown in FIG.
The width a of the cross section of the doping 2 is slightly larger than the diameter b of the bridge element 5, and the length c of the cross section of the lead pin 2 is 2 to 4 times the width a.

The radius of the plug 1 is usually 4.0 mm to 6.0 mm.
0 mm, and the lead pin 2 has a width of 1.0 mm to 1.4 mm.
For example, a nickel-iron heating wire having a radius of 25 μm can be used for the bridge element 5.

According to the present invention, the embolic lead pin 2,
In order to join the electric bridge element 5 between the tips of the lead wires 2 by welding, the electric bridge element 5 is disposed so as to straddle between the end faces of the lead pins 2 and 2, and FIGS. As shown in FIG. 2 (a), one spot welding electrode 61 of the resistance welding machine is brought into contact with the bridge element portion 50 in contact with the lead pin tip surface, and the other electrode 62.
Is brought into direct contact with the lead pin tip end face 20, and a welding current is supplied through these electrodes 61 and 62.

In the above description, the path of the welding current is as shown by the arrow in FIG. 2 (A), and the electric bridge element material and the lead pin material in this current path are melted and the lead pin at the electric bridge element location 50 is melted. Welding to the tip 20 is performed.

The lead pin heated by the welding current is limited to the very tip of the lead pin 2. Most of the lead pin 2 is not heated, and the lead pin 2 and the plug are not heated. Since it is not necessary to expose the entire interface between the lead pin 2 and the sealing glass 4 to the welding heat, the generation of thermal stress at the interface between the lead pin 2 and the plug 1 and the sealing glass 4 is reduced. By excluding it, the fixed airtightness of this interface can be stably maintained.

In the above, the welding connection between the tip end face of the other lead pin and the electric bridge element is performed in the same manner as described above.

[0016]

According to the method of welding the lead pin penetration plug and the electric bridge element of the present invention by welding, as described above,
Without applying thermal stress to the interface between the dopin and the plug, the bridge element can be welded to the tip of the leadpin by resistance welding, and the hermetic fixation between the lead pin and the plug can be improved. Can be kept well as originally.

Therefore, the ignition characteristics of the igniter decrease due to moisture absorption from between the lead pin and the plug, and the igniter is unexpectedly ignited due to friction between the lead pin and the igniter due to the movement of the lead pin. An electric detonator with a safe operation can be manufactured by reliably eliminating blasting failure or the like caused by a blast pressure leak due to a lead pin withdrawal during explosion or ignition.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an ignition member of an electric detonator.

FIG. 2A is a cross-sectional explanatory view showing an embodiment of the present invention, and FIG. 2B is a plan explanatory view of the same.

FIG. 3 is an explanatory sectional view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Plug body 2 Lead pin 20 Lead pin end outer surface 5 Electric bridge element 50 Electric bridge element part on the outer surface of lead pin end 61 Electrode 62 Electrode

──────────────────────────────────────────────────続 き Continuing on the front page (72) Nobuo Yoshida, Inventor 3353-15 Oinaka, Tomimachi, Himeji City, Hyogo Prefecture (72) Ayumu Kimura, 690-1 Okain, Tomimachi, Himeji City, Hyogo Prefecture (58) .Cl. ⁶ , DB name) F42B 3/12

Claims (1)

(57) [Claims] An end of an electric bridge element is located on the outer surface of the leading end of a plug body through which a lead pin is inserted, and one electrode of a resistance welding machine is brought into contact with the outer surface of the leading end of the lead pin. Abuts the bridge element location, and directly contacts the other electrode to the outer surface of the lead pin tip other than the electric bridge element location,
A method for welding a lead pin penetration plug and an electric bridge element, characterized in that a welding current is passed through these two electrodes to weld the lead pin and the electric bridge element.