EP2244050B1 - Zündvorrichtung für Sprengladung - Google Patents

Zündvorrichtung für Sprengladung Download PDF

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Publication number
EP2244050B1
EP2244050B1 EP20100290214 EP10290214A EP2244050B1 EP 2244050 B1 EP2244050 B1 EP 2244050B1 EP 20100290214 EP20100290214 EP 20100290214 EP 10290214 A EP10290214 A EP 10290214A EP 2244050 B1 EP2244050 B1 EP 2244050B1
Authority
EP
European Patent Office
Prior art keywords
relay
priming
initiation
wall
explosive
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP20100290214
Other languages
English (en)
French (fr)
Other versions
EP2244050A1 (de
Inventor
Rémi Boulanger
Frédéric Nozeres
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nexter Munitions SA
Original Assignee
Nexter Munitions SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nexter Munitions SA filed Critical Nexter Munitions SA
Publication of EP2244050A1 publication Critical patent/EP2244050A1/de
Application granted granted Critical
Publication of EP2244050B1 publication Critical patent/EP2244050B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B3/00—Blasting cartridges, i.e. case and explosive
    • F42B3/22—Elements for controlling or guiding the detonation wave, e.g. tubes

Definitions

  • the technical field of the invention is that of priming devices for explosive charging and in particular for an explosive charge with reduced sensitivity.
  • a priming relay which is arranged in contact or remote loading.
  • this relay priming not at one end of the explosive charge, but at very heart of the load.
  • the explosive charge is then provided with a blind cylindrical bore which is arranged axially.
  • the relay is introduced into this bore and is applied against the bottom of the bore.
  • FIG. 1 shows the establishment of such a relay 1 known within an explosive charge 2.
  • the explosive charge 2 is contained in a casing 4 of a munition 3.
  • a cylindrical bore 5 is arranged axially in the load 2. This bore is one-eyed, ie it does not cross all the explosive charge but is interrupted by a bottom 6.
  • the relay 1 comprises a cylindrical case 7 inside which is placed an explosive relay detonation 8, for example hexogen or Octogen or an explosive reduced vulnerability, for example associating hexogen or octogen and ONTA (Oxynitrotriazole) or TATB (1,3,5 triamino 2,4,6 trinitrobenzene).
  • an explosive relay detonation 8 for example hexogen or Octogen or an explosive reduced vulnerability, for example associating hexogen or octogen and ONTA (Oxynitrotriazole) or TATB (1,3,5 triamino 2,4,6 trinitrobenzene).
  • This composition 8 is itself initiated by an initiation means 9, for example a detonator, which is connected to a control means (not shown) by a wire connection 10. It can be seen in the figure that the case 7 is closed at a front end 8a of the composition 8 by a flat front wall 11 which is spaced from the bottom 6 of the bore 5.
  • the relay 1 When firing the detonator 9, the relay 1 is initiated. It will cause the projection of the front wall 11 against the bottom 6 of the bore 5. The resulting impact on the explosive charge 2 will cause the initiation of it.
  • the detonation waves will propagate in the explosive charge 2, not only in the preferred priming direction D (thus to the downstream end (AV) of the load 2) but also to the upstream end (AM) of the load.
  • the energy that is developed causes the detonation of the explosive charge 2 gradually following the upstream and downstream directions bypassing the case 7.
  • the relay 1 then practically a one-off priming of the load 2 from 1 inside of the latter. This results in a regular distribution in the space of the fragments of the envelope 4, distribution having a cylindrical symmetry having the same axis 12 as the ammunition 3.
  • Such a device works perfectly for conventional explosive loads. However it is not the same when one implements explosives with reduced sensitivity.
  • These explosives are formed by a mixture of materials which incorporates at least one reduced-vulnerability solid explosive material such as Oxinitrotriazole (or ONTA), triaminotrinitrobenzene (TATB) or Nitroguanidine (NGu).
  • the explosives with reduced vulnerability have a sensitivity to the impact and to the temperature rise which are reduced which makes it possible to secure their implementation and their use in a munition. This results in a critical critical diameter (of the order of five to ten times greater than the critical diameter of conventional explosives) which makes their initiation more difficult to achieve.
  • the object of the invention is to propose a priming device making it possible to overcome such disadvantages.
  • the device according to the invention makes it possible, without increasing the overall dimensions of the relay, to increase the effective starting area thereof.
  • Such a type of relay is also usable with conventional explosives.
  • the architecture proposed by the invention then makes it possible to reduce the size of the relay without impairing the priming performance.
  • the subject of the invention is a device for priming an explosive charge and in particular an explosive charge with reduced sensitivity, the device comprising at least one ignition relay composition arranged in a blind cylindrical bore arranged axially in the explosive charge, a relay composition which is detonated by an initiation means and acts on the explosive charge at a front end of the relay composition and in a first direction of axial action, characterized in that the The ignition relay composition has a frustoconical shape and is arranged in a case having a frustoconical side wall, the top of the cone being on the side of the initiation means and the dimensions of the relay composition and its case being chosen from so that the initiation of the ignition relay composition thus simultaneously triggers the initiation of the charging at the level of the front end and the impact of the frustoconical side wall on the inner cylindrical surface of the bore.
  • the thickness of the side wall of the case is increasing between the initiation means and the front end of the relay composition.
  • the lateral wall of the case may comprise break initiators along generatrices regularly distributed angularly so as to ensure that this wall is cut into several petals during the initiation of the relay, each petal impacting the surface cylindrical internal bore.
  • the device comprises a flat front wall perpendicular to the axis of the explosive charge, the initiation of the latter at the front end of the relay composition and in the first direction of axial action being ensured by the impact of the front wall against the bottom of the bore.
  • the relay composition comprises at its front end a flat front face directly in contact with the load. explosive at the bottom of the bore, the initiation of this loading in the first direction of axial action being provided by the arrival of the detonation wave against the bottom of the bore.
  • the initiation means may be a plane wave generator.
  • This plane wave generator may for example consist of a cylindrical block of a priming explosive disposed in a confinement and having a face in contact with a rear face of the ignition relay.
  • Relay 1 comprises an explosive detonation relay composition 8, for example hexogen or octogen or an explosive with reduced vulnerability which is initiated. by initiation means 9 connected to a control means (not shown) by a wire link 10.
  • initiation means 9 connected to a control means (not shown) by a wire link 10.
  • Relay 1 is visible more precisely to Figures 3 to 5 . It comprises a particular holster comprising a front ring 16 and a rear ring 13 as well as a front wall 11 and a conical (or rather frustoconical) side wall 17.
  • the front 16 and rear 13 rings have the same diameter as the bore 5 and they ensure the positioning of the device 1 in this bore 5.
  • the rear ring 13 carries a containment cup 14 which encloses the initiation means 9.
  • the latter consists of a cylindrical block of a priming explosive such as hexogen or octogen or a vulnerable explosive. scaled down.
  • the block 9 comprises a face 15 which is in contact with a rear face of the ignition relay composition 8.
  • the diameter and the height of the block 9 are chosen such that this initiation means 9 constitutes almost a generator of plane wave, that is to say that the detonation wave coming from the block 9 arrives at the rear face of the relay composition 8 being substantially flat. It is generally accepted and considered that such a result is obtained when the ratio H / D (height / diameter) of the block 9 is greater than one.
  • the front ring 16 carries the flat front wall 11 which is perpendicular to the axis 12 of the explosive charge 2.
  • the ring comprises an axial bore 18 which allows to provide a free space 21 between the front wall 11 and the bottom 6 of the bore 5 of the explosive charge 2.
  • the frustoconical side wall 17 extends axially between the front ring 16 and the rear ring 13. It is fixed to these two rings by a recess or any other type of mechanical assembly preventing premature leakage of the detonation gases, for example by screwing the ring 16 and the cup 14 (or the ring 13) on the frustoconical wall 17.
  • the ignition relay composition 8 therefore also has a frustoconical shape.
  • the geometric apex of the cones of the wall 17 and the relay composition 8 are located on the side of the initiation means 9.
  • the diameter of the composition relay 8 is regularly increasing between the initiation means 9 and the front end 8a of the relay composition 8 (at the front wall 11).
  • This annular space 19 is therefore decreasing between the rear ring 13 and the front ring 16.
  • the travel time of the wall 17 is longer in the vicinity of the rear ring 13 (maximum width for the annular space 19) than it is in the vicinity of the front ring 16 ( minimum width for the annular space 19).
  • the detonation wave will cause the projection of it on the bottom 6 of the bore 5.
  • the thickness of the side wall 17 of the case is increasing between the initiation means 9 and the front wall 11 (or between the rear ring 13 and the front ring 16).
  • the embodiment shown in the figures comprises four incipient fractures 20 in the form of notches which reduce the thickness of the side wall 17. This number is given as an indication and can be adjusted according to the relay composition torque 8 / projected wall 17, the imperatives of reproducibility of the projection phenomenon and all other observations made by the skilled person. It would be possible, of course, to provide a higher number of primers.
  • the side wall 17 is cut in a preferred manner along these rupture primers 20.
  • the frustoconical side wall 17 is thus cut into several petals 22 (or sectors) which each impact the surface cylindrical internal bore 5. It is thus ensured reliability of the mode of rupture of the side wall 17, so the performance of the device. This will be all the more necessary as the width of the annular space 19 will be important. Failure primers may therefore be omitted if the width of the space 19 (and the thickness of the wall 17) are reduced.
  • the figure 6 shows a simulation of the initiation of the relay 1.
  • the drawing is very schematic since the detonation of the relay will of course cause deformation of the front rings 16 and rear 13.
  • the figure 7 shows another embodiment of a relay 1 according to the invention.
  • This relay differs from the previous one in that it has no projective front wall 11.
  • the relay composition 8 then comprises at its front end 8a a flat front face 23 which is in contact with the explosive charge 2 at the bottom 6 of the bore. In this case the initiation of the explosive charge 2 according to the first direction of axial action D is ensured simply by the arrival of the detonation wave from the relay composition 8 against the bottom 6 of the bore.
  • the frustoconical side wall 17 will be dimensioned so that the initiation of the relay composition 8 simultaneously causes the initiation of the explosive charge in the axial direction D and the impact of the side wall 17 on the surface. internal cylindrical bore 5.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Portable Nailing Machines And Staplers (AREA)
  • Drilling And Exploitation, And Mining Machines And Methods (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)

Claims (7)

  1. Vorrichtung (1) zum Zünden einer Sprengladung (2) und insbesondere einer Sprengladung mit verminderter Empfindlichkeit, wobei die Vorrichtung wenigstens eine Zündrelais-Zusammensetzung (8) umfasst, welche in einer zylindrischen Sacklochbohrung (5) angeordnet ist, die in der Sprengladung (2) axial anordenbar ist, wobei die Relaiszusammensetzung (8) durch ein Initiierungsmittel (9) zur Detonation gebracht wird und im Bereich eines vorderen Endes (8a) der Relaiszusammensetzung (8) und gemäß einer ersten axialen Einwirkungsrichtung (D) auf die Sprengladung (2) einwirkt, wobei die Vorrichtung dadurch gekennzeichnet ist, dass die Zündrelais-Zusammensetzung (8) eine kegelstumpfartige Form besitzt und sich in einer Hülle befindet, welche eine kegelstumpfartige, seitliche Wand (17) umfasst, wobei sich der Scheitel des Kegels auf der Seite des Initiierungsmittels (9) befindet und die Abmessungen der Relaiszusammensetzung (8) und ihrer Hülle derartig gewählt werden, dass die Initiierung der Zündrelais-Zusammensetzung (8) in der Lage ist, in gleichzeitiger Weise so die Initiierung der Ladung (2) im Bereich des vorderen Endes (8a) und den Einschlag der kegelstumpfartigen, seitlichen Wand (17) auf der inneren, zylindrischen Fläche der Bohrung (5) zu bewirken.
  2. Zündvorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die Dicke der seitlichen Wand (17) der Hülle zwischen dem Initiierungsmittel (9) und dem vorderen Ende (8a) der Relaiszusammensetzung (8) zunehmend ist.
  3. Zündvorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die seitliche Wand (17) der Hülle Sollbruchstellen (20) umfasst, die derartig entlang von gleichmäßig über den Umfang verteilte Mantellinien verteilt sind, dass ein Einschnitt dieser Wand (17) in mehrere Lappen (22) bei der Initiierung des Relais (1) gewährleistet wird, wobei jeder Lappen (22) auf die innere, zylindrische Fläche der Bohrung (5) einschlägt.
  4. Zündvorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass sie eine vordere ebene Wand (11) umfasst, die senkrecht zur Achse (12) der Sprengladung (2) steht, wobei die Initiierung dieser Letzteren im Bereich des vorderen Endes (8a) der Relaiszusammensetzung (8) und gemäß der ersten axialen Einwirkungsrichtung (D) durch den Einschlag der vorderen Wand (11) gegen den Boden der Bohrung (6) gewährleistet wird.
  5. Zündvorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Relaiszusammensetzung (8) im Bereich ihres vorderen Endes (8a) eine ebene, vordere Fläche (23) umfasst, welche mit der Sprengladung (2) im Bereich des Bodens (6) der Bohrung (5) direkt in Kontakt steht, wobei die Initiierung dieser Ladung gemäß der ersten axialen Einwirkungsrichtung (D) dadurch gewährleistet wird, dass die Detonationswelle am Boden (6) der Bohrung eintrifft.
  6. Zündvorrichtung nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass das Initiierungsmittel (9) ein Erzeuger ebener Wellen ist.
  7. Zündvorrichtung nach Anspruch 6, dadurch gekennzeichnet, dass der Erzeuger ebener Wellen (9) durch einen zylindrischen Block eines Zündsprengstoffs gebildet wird, welcher in einem Einschluss (14) angeordnet ist und eine Fläche (15) umfasst, welche mit einer hinteren Fläche des Zündrelais (8) in Kontakt ist.
EP20100290214 2009-04-22 2010-04-21 Zündvorrichtung für Sprengladung Active EP2244050B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0901952A FR2944864B1 (fr) 2009-04-22 2009-04-22 Dispositif d'amorcage d'un chargement explosif

Publications (2)

Publication Number Publication Date
EP2244050A1 EP2244050A1 (de) 2010-10-27
EP2244050B1 true EP2244050B1 (de) 2013-03-06

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP20100290214 Active EP2244050B1 (de) 2009-04-22 2010-04-21 Zündvorrichtung für Sprengladung

Country Status (3)

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EP (1) EP2244050B1 (de)
ES (1) ES2404343T3 (de)
FR (1) FR2944864B1 (de)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2748102B1 (fr) * 1996-04-30 1998-07-17 Tda Armements Sas Munition a fragmentation de symetrie equatoriale d'expulsion
MX2009009804A (es) * 2007-03-16 2009-11-09 Orica Explosives Tech Pty Ltd Iniciacion de materiales explosivos.

Also Published As

Publication number Publication date
FR2944864B1 (fr) 2011-04-01
ES2404343T3 (es) 2013-05-27
EP2244050A1 (de) 2010-10-27
FR2944864A1 (fr) 2010-10-29

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