DE2922351A1 - Ignition system for explosive charges - has ignition loops, with each alternate loop housing charge with plug inside, for subsequent charge firing - Google Patents

Abstract

The system of firing explosive charges in sequence, as in 2825742, uses a connecting wire bent into a figure of eight shape, arranged adjacent to a set of wires similarly bent. Each figure of eight has wire turns wound round the crossing point, and has a charge connected inside one loop. The loops in a line are alternatively empty and filled by a charge. Each charge has a cylindrical casing (7) divided into two by a steel plug (1), with the secondary charge (8) below it. Inside the plug is a cavity (2) with the primary charge (5) inside, and a layer (6) dividing the two charges. A hole (4) through the plug, connects the primary charge with the chamber above, containing the igniter charge (11).

Description

Explosive detonator

The invention is concerned with an explosive detonator in the preamble of claim 1 specified Art.

Electric explosive detonators have a closed one at one end Detonator sleeve made of metal or plastic, in which an under or secondary charge made of compressed secondary explosive and a charge or primary charge made of initial explosive are introduced. The primary charge is either compressed mlr or additionally covered with a perforated disc or a so-called inner cap and so on secured against leakage.

Investigations with these electric momentum detonators have shown that they can be assigned to objects with a mass explosion hazard. Mass explosive means that in the event of an explosion a single detonator in a packaging unit with several detonators a chain of the remaining detonators is to be maintained.

The main patent (German patent application P 28 25 742.3) concerns an explosive detonator with a detonator sleeve and a primary and secondary charge, wherein a tubular insert body is disposed in the detonator sleeve is, the continuous axial recess has a cross-sectional constriction and on one side of the constriction as containing the primary charge, the secondary charge facing cargo space and on the other side of the constriction as cargo-free Empty space is formed, the insert body at least in its the cargo space laterally surrounding part is made thick-walled.

This makes it possible to create an electric momentum detonator, which no longer explodes en masse.

In an expedient further development of the invention, it is now proposed that according to the characteristics of claim 1 an insert body without additional to use uncharged empty space. As has been found, it is the same with one of these thick-walled insert body possible to create explosive detonators that are not in Class explode. The insert body is preferably made of metal such as steel or aluminum or brass, but can e.g.

can also be made of plastic. At least its the cargo space in which the initial explosive is contained, laterally surrounding wall is thick in relation to the wall of the detonator sleeve and thus also in relation to the known inner cap, the wall thickness of which corresponds to that of the detonator sleeve. The wall thickness is preferably so great that by an adjacent explosive detonator of the same design, as is usually the case in packaging units, none Initiation of the primary charge located in the insert takes place. However, it can geri @@ he is @, if a special one is explained in more detail below @ according to the invention Packaging arrangement is chosen. The wall thickness of the insert body is greater, the lower its strength. In the case of metallic insert bodies, their Wall thickness generally about 5 to 10 times the wall thickness of the metallic Detonator sleeves.

The insert body is: with its containing the initial explosive Charge space facing the secondary charge located in the lower part of the cylinder case inserted into the detonator sleeve so that the charge-free cross-sectional constriction de arranged above the insert body at a distance therefrom in the detonator sleeve Is facing the ignition element of the explosive detonator. This narrowing of the cross-section the continuous axial recess of the insert body is on the one hand so large that that the ignition jet emanating from the ignition element still correctly ignites the Primary charge causes. On the other hand, it is so small that no pressure ignition is possible the primary charge through the one located above the insert in the detonator case Air occurs when it is caused by a detonation acting on the detonator sleeve from outside The cross-sectional constriction is preferably as a central bore trained. The bore diameter will generally not be less than about 1 am and no larger than about 3 mm. The smaller values are preferred. the axial length of the cross-sectional constriction is preferably at least equal to theirs Diameter.

The primary charge is preferably introduced so that the area the cross-sectional constriction is free of initial explosives. If necessary, the Cross-sectional constriction, however, also on part of its axial extent, a corresponding one Provided that it is long, it must still be filled with internal explosives.

With the insert body according to the invention in a cargo space greater wall thickness accommodated primary charge and a cross-sectional constriction one obtains in an advantageous manner an electrical one which is protected against mass explosions Explosive detonator. This security can be further increased by the following measure will.

The two igniter wires of the igniter element, which are led out of the igniter sleeve can be up to several meters long. They are preferred in appropriate Devices folded into eight-shaped loops and approximated in their Wrapped in the middle to avoid the loops opening. The change takes place d.this preferably by means of the detonator wires themselves. With explosive detonators with these so-called wire puppets are provided according to a further proposal of the invention, this according to claim 2 in particular in the packaging units, z, .B.

a shipping box. Due to the alternating arrangement of wire doll parts with detonator sleeves and those without detonator sleeves becomes a tight one Avoided and side by side a large number of explosive detonators. in order to an additional increase in safety against mass explosions is achieved.

The invention is shown in the drawing in exemplary embodiments and is based on this below. explained in more detail. 1 shows a Explosive detonator in longitudinal section and FIG. 2 shows the arrangement of several detonators in a schematic representation.

The insert body shown installed in the detonator in FIG. 1 1 made of steel, for example, has the cargo space 2 and the cross-sectional constriction 4. In The primary charge 5 made of initial explosive is introduced into the cargo space 2 and with a thin layer 6 of a secondary explosive, for example nitropenta, covered. The insert body 1 is both in the area of the cargo space 2 and the constriction 4 - viewed here in the axial direction - in comparison to the walls the usual. Detonator sleeves and inner caps are thick-walled.

With an outer diameter of the insert body between approximately 5 and 7 mm, the inside diameter of the cargo space 2 is generally between 2 and 4 mm, preferably about 2.5 to 3.5 mm, and the bore diameter between about 1 and 3 mm. The wall thickness of the metallic detonator sleeves is usually between about 0.2 and 0.4 mm.

The axial length of the hold 2 depends on the required Amount of primary charge. It is generally between about 4 and 6 mm.

The explosive detonator shown in Fig. 1 has the at the lower end closed detonator sleeve 7 made of e.g. aluminum, into which the secondary charge 8 i is introduced, secondary charges are used for mass explosion-proof detonators preferably those secondary explosives used against detonation shock and / or mechanical effects are the same or less sensitive than tetryl.

@@@ er tetryl are for example also trinitrotoluene @@ er trinitroxylene usable. Applied to the secondary charge 8 is the insert body 1 with the Primary charge 5 and cover 6 made of nitro penta. The known common initial explosives such as lead azide or mixtures of lead azide with lead typhnate used At the upper end, the igniter sleeve 7 is closed with the plug 9, by which the two detonator wires 10 are passed, which at its inner end the have electric igniter 11.

Fig. 2 shows the preferred arrangement for packaging the detonators with wire puppets 12, which are only shown schematically as eight-shaped loops with a central Wrapping 13 are indicated. Di.e detonator sleeves 7 are each in the interior of a Half of the loop folded over, but could also protrude beyond the respective end of the doll. The dolls 12 are arranged in a position next to one another and one behind the other.

that in each case a loop part 14 with detonator sleeve 7 and a loop part 15 are adjacent without a detonator sleeve.

13 in the next - not shown - to be packaged layer of Wire puppets are then oriented in an analogous manner to the puppets 12 on the one shown Srhlcht laid that in each case a loop part 1 with detonator sleeve on a loop part 15 comes to rest without a detonator sleeve and vice versa.

L e r s e i t e

Claims (2)

Claims: 1. Explosive moment detonator with a detonator sleeve and in this arranged primary and secondary charge, according to claim 1 of the main patent (German patent application P 28 25 742.3), d a d u r c h g e k e n n -z e i c h n e t that instead of an insert body with additional charge-free empty space in the detonator sleeve (7) a tubular, annular disk-shaped or the like. Insert body (1) is disordered, the axial recess passing through it has a cross-sectional constriction (4) at one end and adjoins the constriction in it (4) Adjacent area as the primary charge (5) containing the secondary charge (8) facing cargo space (2) is formed, wherein the insert body (1) at least is made thick-walled in its part laterally surrounding the cargo space (2). 2. Explosive detonator according to claim 1, wherein the outside of the detonator sleeve located detonator wires are folded to eight-shaped wire puppets, characterized in that that the detonator sleeves (7) are arranged near one end of the wire puppets (12) and in the case of wire puppets (12) arranged next to, behind and / or one above the other, this is the case are aligned so that alternately a doll part (14) with detonator sleeve (7) one Doll part (15) is adjacent without detonator sleeve.