JPH10115500A - Electric detonator closure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric detonator closure plug wherein a pair of lead pins are provided and an electrode wire is connected between tip end surfaces of these lead pins, the improvement being such that there are easily achieved high accuracy setting of electrode wire resistance between the lead pins, and stability of sealing and a heat insulation property. SOLUTION: The present closure is adapted such that a sealing base 2 is disposed on the back of a plug body 1, and a pair of lead pins 31, 32 are inserted into a pair of lead pin insertion holes in the plug body 1 through the base 2, and a sealing agent 4 is sealed in the base to seal and fix the plug body and the socket therebetween and the plug body and the lead pins, and the electrode wire 5 is connected between tip end surfaces 310, 320 of the pair of the lead pins. Herein, plug body insertion parts 131, 132 of the lead pins 31, 32 are constructed into a cross sectional configuration of a rectangle to form the tip end surfaces 310, 320 of the pair of the led pins as parallel rectangles, and further a part of the lead pins 31, 32 at least in the base 2 is constructed into a circular cross section.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric plug for an electric detonator.

[0002]

2. Description of the Related Art Electric detonators and concrete used for blasting operations
As an electric detonator for use in a crusher for an air port, an electric detonator for an airbag for an automobile, etc., an embolus in which a pair of lead pins are penetrated and an electric bridge line is connected between the end faces of the lead pins is used as an igniter. Is known which is inserted into a metal cylinder in which is stored.

[0003] In the plugging of the electric detonator, stable and strong hermeticity is required in order to prevent the deterioration of the moisture absorption of the igniting agent and to prevent the escaping by the ignition flame pressure (to prevent the explosion pressure from leaking). Therefore, the applicant of the present invention has shown FIG.
As shown in (b) of FIG. 4 (a cross-sectional view of FIG. 4 (a)), a sealing cap 2 'is arranged on the back surface of the plug 1', and a pair of lead pins of the plug 1 'is provided. A pair of lead pins 31 'and 32' are inserted through the insertion holes 131 'and 132' through the base 2 ', and the inside of the base 2' is sealed with glass 4 'to provide a space between the plug 1' and the base 2 '. The plug 1 'is sealed and fixed between the lead 1' and the lead pins 31 'and 32', and an embolus formed by connecting the electric bridge 5 'between the tip end surfaces of the pair of lead pins 31' and 32 '. It has already been proposed (Japanese Patent Application No. 3-277374). Since this embolus is sealed with glass, it is possible to guarantee a stable and heat-resistant hermeticity, and it is possible to surely prevent deterioration of the igniting agent due to moisture absorption and withdrawal due to ignition flame pressure.

[0004] In addition, in the embolization of an electric detonator, it is possible to eliminate a stray current caused by a stray current or a monitor current flowing through a bridge line connected between the lead pins, and to reliably perform an ignition operation with an operation current for ignition. Required. Therefore, the applicant has
As shown in (a) and (b) of FIG. 5 (cross-sectional view taken along the roll in (a) of FIG. 5), a pair of lead pins 31 ', 3
A rectangular cross section is used for 2 ', and these lead pins are pierced through the plug 1', and the tip end surfaces 31 of the pair of lead pins are used.
0 'and 320' are made rectangular parallel to each other, and the angle of the bridge wire 5 'is adjusted with respect to the parallel
It has already been proposed to set the bridge wire resistance between 1 'and 32' to a predetermined constant value (Utility Model Registration No. 2515211).
issue). That is, a pair of lead pin tip end surfaces 310 ',
Assuming that the distance between the parallel rectangles 320 'is L, the resistance per unit length of the bridge wire 5' is r, and the angle of the bridge wire 5 'is θ, the bridge between the lead pins 31' and 32 '. The linear resistance value R is given by R = rL / sinθ, and it has been proposed to set the resistance value R to a predetermined constant value by adjusting the angle θ. According to the mounting structure of the electric bridge wire, even if the distance L between the end faces 310 'and 320' of the lead pins deviates from the reference value, it can be corrected by adjusting the angle θ, and a highly accurate resistance value can be set. become.

[0005]

However, in the embolus shown in FIG. 4, a lead pin having a rectangular cross section is used in accordance with the mounting structure of the electric bridge line shown in FIG.
If the tip end face of the dopin is a parallel rectangular shape and the resistance value of the bridge pin is set to a predetermined constant value by adjusting the angle of the bridge wire, the lead pin having a rectangular cross section must be glass-sealed with a base. In addition, the thermal stress generated during the solidification of the sealing glass is concentrated on the corners of the rectangular section of the lead pin, and there is a concern that the glass may crack, and it is difficult to guarantee the stability and heat resistance of sealing.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an embolus in which a pair of lead pins are penetrated and a bridge wire is connected between the end faces of these lead pins. An object of the present invention is to provide an electric detonator embolus capable of easily achieving both stability and heat resistance of setting and sealing.

[0007]

In the plug for an electric detonator according to the present invention, a sealing cap is provided on the back surface of the plug, and a lead pin is inserted through a pair of lead pin insertion holes of the plug. And
A sealing agent is sealed in the base to seal and fix between the plug and the base and between the plug and the lead pin, and a bridge is connected between the tip end surfaces of the lead pins. The embolus is characterized in that the plug insertion portion of the lead pin is rectangular in cross section, the tip end faces of the lead pin are rectangular parallel to each other, and at least the inner portion of the base of both lead pins is circular in cross section. By bending the lead pin in the base, the interval between the rear ends of the lead pins outside the base can be set independently of the interval between the leading ends of the lead pins.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1A is a plan view showing an electric detonator embolus according to the present invention, and FIG.
(A) is a cross-sectional view taken along the line, and (c) of FIG. 1 is a cross-sectional view of the embolus taken along the line (b) of FIG. In FIG. 1A to FIG. 1C, reference numeral 1 denotes a plug made of ceramic, for example, alumina ceramic, having a boss 11 formed on the back side, and a pair of cross sections from the front end face 121 to the boss 11 side. Rectangular lead pin insertion hole 13
1, 132 are formed. Reference numerals 14 and 14 denote flat surfaces formed to clamp the plug in a predetermined direction by a jig and parallel to the front end surface. Reference numeral 2 denotes a base, which comprises a lead pin insertion end plate portion 21 and a cylindrical portion 22, and the lead pin insertion end plate portion 21 is attached to the back surface 122 of the plug 1. Reference numerals 31 and 32 denote a pair of lead pins. Ends 311 and 321 on the side inserted into the plug 1 are flattened by crushing, and the other portions 312 and 322 are kept circular in cross section. Each of the lead pins 31 and 32 is bent in the base 2 in order to set the interval between the rear end portions of the lead pins to a predetermined wide interval independently of the interval between the tip ends of the lead pins. Also, the flat portion 311 of one lead pin 31
Is welded with a claw 231 provided in the central opening 23 of the end plate portion 21 of the sealing base 2, and a space 141 for receiving the claw 231 is formed in the plug 1. Reference numeral 4 denotes sealing glass filled in the base 2, for example, lead glass. Reference numeral 5 denotes an electric bridge line connected between the end faces of the lead pins.

In order to manufacture the plug for an electric detonator according to the present invention, the flat tip 311 of one of the lead pins 31 is welded to the claw 231 of the base plate 21, and the flat tip 311 is connected to the plug 1. And the center opening 23 of the end plate 21 of the base 2 is inserted into the boss 11 of the plug 1.
Insert up. In this case, the end plate 21 of the base 2 is brought into contact with the back surface 122 of the plug 1, whereby one lead pin 31 is positioned, and the other lead pin 32 is placed on the shoulder 32.
The position is determined by the contact of the plug 0 with the back surface 122 of the plug. Under this positioning state, the plug 2 is filled with a glass frit, for example, lead glass powder, with the cap facing downward and the cap facing upward, and the powder is melted and solidified to form the cap 2 and the plug 1. The space between the lead pins 31 and 32 is sealed. When the molten glass is cooled and solidified in this sealing, thermal stress is generated due to a difference in thermal expansion coefficient and a difference in Young's modulus between the lead pin and the glass. As there is no corner at the interface between the lead pin and the glass,
Stress concentration can be eliminated and cracks can be sufficiently prevented.

After the glass is sealed in the base 2 in this manner, as shown in FIG. 2, an electric bridge line is formed on the rectangular end surfaces 310 and 320 of the pair of lead pins, which are parallel to each other. By adjusting θ, the resistance value between the lead pins is set to a predetermined constant value based on the above equation, and then, one welding electrode A of the resistance welding machine is connected to the electrode of one lead pin tip end face 310. It is arranged on one end 51 of the bridge 5, and the other welding electrode B is brought into direct contact with the tip end surface 310 of the
Is resistance welded between one end 51 of the lead wire and one end face 310 of the lead pin, and the other end 52 of the bridge wire 5 and the end face 320 of the other lead pin are made in the same manner as described above. Resistance welding. In this case, the leading end surfaces 310, 3 of the lead pins
Even if the distance L between the distances 20 deviates from the reference value, the resistance value can be set to a predetermined resistance value by adjusting the angle θ, and a highly accurate resistance value can be set.

To manufacture an electric detonator using the plug according to the present invention, as shown in FIG. 3, the plug is inserted into a metal outer cylinder 6 containing an igniting agent 61 and the electric bridge wire 5 is attached. Gunpowder 61
To make the space between the cylindrical portion 22 of the base 2 and the metal outer cylinder 6 airtight and electrically conductive by welding, thereby completing the production of the electric detonator. The electric bridge wire 5 can be made of a single metal such as iron, nickel, molybdenum, platinum, tungsten, and tantalum, or an alloy such as nickel-chromium or iron-chromium-aluminum. The above lead pin 31,
32 is used that can be easily connected to an electric bridge and has excellent adhesion to a sealing material such as glass or epoxy resin. For example, simple metals such as iron, nickel, and copper, and alloys such as nickel-iron are used. The base 2 and the outer cylinder 6 are made of a metal having excellent corrosion resistance and excellent adhesion to a sealant such as glass, for example, stainless steel. In the above, the standard outside diameter of the bridge wire 5 is 30 μm, and the lead pin 3
The standard outer diameter of the plugs 1 and 32 is 1.0 mm, and the standard outer diameter of the plug 1 is 7 mm.

In the above embolus, one of the lead pins 3
The reason why 1 was electrically connected to the base 2 by the claw 231 is as follows.
The tip of the lead pins 31 and 32, the electric bridge wire 5, etc. and the metal outer cylinder 6
The purpose of this is to prevent an excessive potential difference from acting on the cylinder portion 22 and reliably prevent ignition explosion of the igniting agent due to discharge between them. Can be electrically connected to one of the lead pins 31 or 32 (for example, a claw is formed at the end of the cylindrical portion, and this claw is welded to one of the lead pins). In the above embodiment, the tip 311 of the lead pin 31 (32) is used.
Since (321) is inserted into the lead pin insertion hole 131 (132) of the plug 1 as a rectangular cross section, the rotation of the lead pin can be prevented and the positioning of the lead pin can be easily performed. If the rectangular cross-sectional area of each of the lead pin tips 311 and 321 is made different and the cross-sectional area of each of the lead pin insertion holes 131 and 132 is made different accordingly, the distance between the insertion of the pair of lead pins is reduced. The difference can be reliably prevented, and the embolus can be assembled more smoothly. In the above embodiment, in order to visually distinguish between the side where the lead pin and the base are connected and the side where the lead pin is not connected, a mark for identifying the end is provided on one end surface of the plug. A king recess 15 is provided.

In the embolus according to the present invention, the interval between the rectangular end faces 310, 320 of the pair of lead pins 31, 32 is set based on the resistance value per unit length of the bridge wire and the set resistance value. You. On the other hand, regarding the interval between the rear ends of the lead pins, the lead wire is connected to the rear ends of the lead pins, and the magnetic components are mounted between the rear ends of the lead pins. Of the lead pins 31 and 32 of
The intervals are set independently of each other without being restricted by the intervals between the lead pins.

[0014]

In the embolus for an electric detonator according to the present invention, an electric bridge is inserted between the tip end surfaces of a pair of lead pins inserted through the plug body with high precision resistance value management. The lead pins are rectangular in cross section, and the tip end faces of the pair of lead pins are rectangular parallel to each other. However, the lead pins in the base are circular in cross section and the base is sealed with glass. It is possible to prevent thermal stress from concentrating at the time of melting and cooling of the glass at the glass portion in contact with the glass, and it is possible to seal the glass without generating cracks. Further, the interval between the rear end portions of the lead pins can be independently set to a predetermined interval without being restricted by the interval between the lead pins due to the bending of the lead pins in the base. Can be easily set to a desired interval for high-precision control of the resistance value, and a rear end interval of the lead pin can be easily set to a desired interval for mounting a lead wire or a magnetic component.

Therefore, according to the present invention, it is possible to set both the precision of the resistance of the bridge wire between the lead pins and the stability and heat resistance of sealing, and as a result, a malfunction due to the error in the resistance of the bridge wire is achieved. In addition, malfunction due to moisture absorption deterioration of the explosive, and malfunction of the electric detonator due to leakage of explosion pressure can be reliably eliminated.
It is possible to provide an electric detonator embolus which can easily perform connection of an electric wire.

[Brief description of the drawings]

FIG. 1A is a plan view showing an example of an electric detonator embolus according to the present invention, FIG. 1B is a cross-sectional view of FIG. 1A, and FIG. C) is the embolus of Fig. 1 (b)
FIG.

FIG. 2 is an explanatory view showing a method of joining a railway bridge with an electric detonator embolus according to the present invention.

FIG. 3 is an explanatory view showing an electric detonator using an embolus according to the present invention.

FIG. 4 is an explanatory view showing a conventional electric detonator embolus.

FIG. 5 is an explanatory diagram showing another conventional electric detonator embolus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Plug body 121 One end face of a plug body 122 The other end face of a plug body 131 Lead pin insertion hole 132 Lead pin insertion hole 2 Base 31 Lead pin 32 Lead pin 310 Tip end face of lead pin 320 Tip of lead pin End face 4 Sealant 5 Denbashi line

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Yasuhiko Tomitaka 1-11-28 Shimanouchi, Chuo-ku, Osaka-shi Uchihashi S-Tech Co., Ltd.

Claims (2)

[Claims] A plug is provided with a sealing cap on the back of the plug, a lead pin is inserted through a pair of lead pin insertion holes of the plug, and a sealing agent is sealed in the cap. In an embolus in which the body, the base and the lead pin are sealed and fixed, and a bridge is connected between the end faces of the pair of lead pins, the plug insertion portion of the lead pin is formed as a rectangular cross section. -A plug for an electric detonator, characterized in that the tip end surfaces of the dopins are rectangular parallel to each other and at least the inner portions of the caps are circular in cross section. 2. The electric detonator according to claim 1, wherein the lead pins are bent in the base and the mutual distance between the rear ends of the lead pins outside the base is set independently of the mutual distance between the leading ends of the lead pins. Emboli.