WO2000031495A1 - Dispositif pyrotechnique et son contenant - Google Patents

Dispositif pyrotechnique et son contenant Download PDF

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Publication number
WO2000031495A1
WO2000031495A1 PCT/GB1998/003538 GB9803538W WO0031495A1 WO 2000031495 A1 WO2000031495 A1 WO 2000031495A1 GB 9803538 W GB9803538 W GB 9803538W WO 0031495 A1 WO0031495 A1 WO 0031495A1
Authority
WO
WIPO (PCT)
Prior art keywords
container
open end
pyrotechnic
cavity
initiator
Prior art date
Application number
PCT/GB1998/003538
Other languages
English (en)
Inventor
Michael Anthony Landrail Oldham
Raymond Townley-Malyon
Michael John Lessey
Robert Wallace Dabner
Original Assignee
Altex Technologies Ltd.
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 Altex Technologies Ltd. filed Critical Altex Technologies Ltd.
Priority to AU12516/99A priority Critical patent/AU1251699A/en
Priority to PCT/GB1998/003538 priority patent/WO2000031495A1/fr
Publication of WO2000031495A1 publication Critical patent/WO2000031495A1/fr

Links

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
    • F42B3/26—Arrangements for mounting initiators; Accessories therefor, e.g. tools
    • 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
    • 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
    • F42B3/02—Blasting cartridges, i.e. case and explosive adapted to be united into assemblies

Definitions

  • This invention relates to a pyrotechnics device and a container therefor, and to a method of making the container.
  • Pyrotechnics comprise granular powder mix which when ignited produces large volumes of gas which has to be contained in a hole in rock, stone, masonry and the like, to produce any heaving action. Pyrotechnics are typically used in quarrying, tunnelling, demolition, mining or civil engineering. The granular powder mix is typically placed in tubular containers formed of rolled paper, cardboard or an extruded plastics tube and the ends of the tubes sealed by a plug or closure pushed into each end of the tube. The closure is punctured to permit the insertion of an initiator through the plug for contact with the explosive for the purposes of detonation.
  • the prior art containers are not particularly suitable for underwater work since the plugs may leak and the integrity of the container has to be breached for insertion of the initiator.
  • a container for a pyrotechnic device comprising an elongate hollow plastics body having an integral end wall at one end thereof with an axially inwardly extending blind cavity therein for receipt of an initiator.
  • the end wall having the integral initiator cavity may be formed separately and welded in place, or is moulded integrally with the elongate body.
  • the container is closed at its open end by a stemming plug having a base portion, preferably hollow, which is an interference fit in said open end and an outer portion which is in the form of a funnel opening outwards in the direction away from the open end.
  • the open end may additionally or alternately be closed by a resilient disc-like seal.
  • a cap may be pushed into the mouth of the hollow base portion of the stemming plug.
  • the stemming plug and seal are made of an elastomeric material such as a melt processable rubber e.g a polyurethane elastomer, or a fluoroelastomer .
  • a melt processable rubber e.g a polyurethane elastomer, or a fluoroelastomer .
  • the end portion of the container adjacent the end wall has a smaller cross-section such that said end portion is a sliding or interference fit into the open end of a second container. Portions of the end wall surrounding the cavity may be thinned to allow flash over from one container to the other .
  • the invention also includes a pyrotechnic device having a container of the type described above.
  • a method of varying a pyrotechnic charge in which method containers, according to the above invention, are filled with a known charge, and one container having a known charge therein is connected to a second container having a second known charge therein by fitting the one end portion of the first container into the open end of the second container.
  • the first and second known charges are not necssarily of the same weight.
  • Fig.l is a longitudinal cross-section through a container according to the present invention
  • Fig.2 is a view in the direction of arrow A of the container shown in Fig. 1
  • Fig.3 is a view in the direction of arrow B of the open end of the container shown in Fig.2,
  • Fig.4 is a cross-section through a stemming plug
  • Fig.5 is a view of the end wall of the plug in the direction of arrow C
  • Fig.6 is a section through a second container according to the present invention
  • Fig.7 is a view of the end wall of the second container taken in the direction of arrow D
  • Fig.8 is a sectional view through a second container after assembly
  • Fig. 9 is a plan view of a seal used the containers
  • Fig. 10 is a section on the line X-X of Fig. 9
  • Fig. 11 is a sectional view through two second containers assembled together
  • Fig. 12 is a view through a modified stemming plug
  • Fig. 13 is a schematic drawing showing the moulding process
  • Fig. 14 is also a schematic drawing of the moulding process .
  • a pyrotechnic container body 11 with is in the form of an elongated cylindrical tube but could have other cross-sections if desired.
  • the tubular body has an open upper end 12 and its lower end is closed by an end wall 13.
  • the end wall 13 has an axially extending cavity 14 whose side walls 15 are integrally formed with the end wall 13 and extend inwardly of the container.
  • the cavity 14 is open to receive an initiator 130 and the cavity wall 15 may be formed with internal raised ribs 16 for gripping an initiator located therein (see Fig 11).
  • the body 11 with its endwall 13 is preferably injection moulded as a single componenet since this allows the body side walls to be formed with a substantially constant all-over thickness which is important for the use of pyrotechnic devices underwater.
  • the behaviour of the tubular body 11 must be predicable down to 200 ft of water pressure.
  • the body 11 may be extruded, and the endwall with the integral initiator cavity 14 may be welded into the end of the tube.
  • the body 11 is preferably moulded from a low static or anti-static polyolefin, more preferably a polypropylene compound.
  • the body may be formed of different diameters as is required, for example 25 mm, 48 mm and 75 mm.
  • the open end 12 of the container body 11 is closed by a stemming plug 20 as shown in Fig.4 and Fig. 8.
  • the stemming plug 20 is hollow and has an inner base portion 21 which is cylindrical and an outer upper portion 22 having a frustoconical funnel shape.
  • the base portion 21 is reinforced by three, or four, radial ribs 23.
  • the stemming plug 20 is injection moulded from a resilient elastomeric material having a Shore A hardness of 65-80. Suitable materials may be a polyurethane rubber, a silicone rubber, a fluoroelastomer or a PVC plastisol.
  • the stemming plug is preferably moulded from a melt processable rubber e.g. Alcryn 2070 available from Dupont .
  • the first end portion 21 is of such a size that it is a push fit into the open end 12 of the body 11.
  • the external surface 23 of the first portion may have a raised peripheral rib 24 or step formed thereon to improve its seal against the internal surface of the body 11.
  • the stemming plug may include a cap which locates in the base of the funnel-shaped portion 22 and extends into the hollow base portion 21, as is shown in Fig.12.
  • the open end of the body may be closed by an inflatable membrane plug.
  • the open end 12 of the container body 11 may alternatively or additionally be closed by a disc-like seal 90 shown in Figs. 9 & 10.
  • the seal 90 has thinned down membraneous areas 92 within a thickened peripheral and central portions 91 and 93. Radial reinforcing ribs 94 connect the outer and central portions.
  • the seal 90 is made from the same sort of material as the stemming plug and is an interference fit in the open mouth 12 of the tube.
  • a second type of container body 111 having an open end 112 as before.
  • the other end of the container is closed by an end wall 113 which is on the end of a reduced diameter end portion 121 of the body 111.
  • the end portion 121 is an interference fit into the open end of another container as will be described.
  • the shoulder 126 between the body 111 and the lower end portion 121 limits the insertion of one tube into another.
  • the cavity 114 is formed in the end wall 113 which is formed with thinned down areas 122.
  • the cavity wall 115 is connected to the body 111 by radial ribs 123, preferably four.
  • a fully assembled container 81 In Fig.8 there is shown a fully assembled container 81 .
  • This container 81 is shown with a container body from Fig. 6 but could equally use a container body from Fig. 1. Pyrotechnic powder is put into the container body 111 upto the required weight. A seal 90 may be pushed into the container 111 to retain the powder and more thoroughly seal the container. A stemming plug 20 is then pushed into the open end of the container body 111. An initiator 130, see fig 11, is then inserted into the cavity.
  • a pyrotechnic device may be inserted in a drilled hole in, say, rock.
  • the flexible funnel portion 22 helps seal the drilled hole when clay or other sealing medium is used to plug the drilled hole, and is received in the funnel portion.
  • the above container and pyrotechnic device has a waterproof body with an integral initiator holder. The initiator has not pierced the container body and is not in direct contact with the pyrotechnic material .
  • FIG 11 there are shown two containers 81A and 81B assembled to form a second selected required charge.
  • the stemming plug from the lower container 81B is removed leaving the seal 90 in place.
  • the upper container 81A, without an initiator present in the cavity 114 has its lower end 121 pushed into the open end 112 of the lower container. This may be repeated for a third container and possibly for up to five containers in assembly together.
  • An initiator 130 is pushed into the cavity 114 of the lower container.
  • the lower container should be of the type shown in Fig. 1.
  • variable charges can be made up on site without breaching the integrity of the previously charged containers.
  • the initiator reaction flashes through the cavity wall into the lower container, and flashes through the thinned portions of seals 90 and end walls 113 to detonate all the assembled containers.
  • the container bodies may be made in a variety of different standard lengths for different charge weights, and could be different coloured for different applications.
  • a modified stemming plug 120 which includes a rigid plastics cap 130 inserted into the hollow cylindrical portion of the plug to squeeze the softer material of the cylindrical portion of the stemming plug against the wall of the body.
  • a seal 90 may also be inserted.
  • the container bodies 11 are formed by injection moulding techniques in which plastics material, preferably polypropylene, is injected into a longitudinally split mould 200 which is clamped under a clamp load of 20-25 tonnes.
  • the bodies 11 are moulded around a cylindrical concentric parallel sided core 201 using hot runner systems. Since the length of cavity to be filled relative to its thickness is at least 60:1, the material is injected slowly, typically over about 2 seconds, and preferably the material is injected in two batches with a 0.25-0.5 second time delay between the two injection processes .
  • the material is cooled, the mould is relieved so that there is still a 1-2 tonne load on the mould and the core is withdrawn whilst the body 11 is still under some load.
  • the mould 200 is the opened by and the body can be removed.
  • the core 201 may be hollow and have a cooling medium passed therethrough.
  • the mould core may be clamped by core supports at its end adjacent the body end wall. The upper portion of the body is moulded first, the core supports are withdrawn, and the lower portion is injected thereafter.
  • the body 11 is preferably formed from extruded tube, and the end wall 13 and initiator cavity 14 are moulded as a separate unit which is welded into the end of the extruded tube.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Closures For Containers (AREA)

Abstract

Ce contenant pour dispositif pyrotechnique comporte un corps creux de forme allongée, en matière plastique (11) ayant, sur l'une de ses extrémités, une paroi terminale d'une seule pièce (13) définissant une cavité aveugle (14) s'étendant axialement vers l'intérieur et destinée à loger un initiateur (130). L'extrémité ouverte (12) du contenant peut être obturée par un bouchon de bourrage élastique (20) dont une première partie y est ajustée serrée. Un joint d'étanchéité du type disque (90) se trouve à l'intérieur de ce bouchon de bourrage. L'initiateur (130) met à feu le matériau pyrotechnique au moyen d'un éclair à travers la paroi de la cavité (14).
PCT/GB1998/003538 1998-11-26 1998-11-26 Dispositif pyrotechnique et son contenant WO2000031495A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU12516/99A AU1251699A (en) 1998-11-26 1998-11-26 A pyrotechnic device and container therefor
PCT/GB1998/003538 WO2000031495A1 (fr) 1998-11-26 1998-11-26 Dispositif pyrotechnique et son contenant

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/GB1998/003538 WO2000031495A1 (fr) 1998-11-26 1998-11-26 Dispositif pyrotechnique et son contenant

Publications (1)

Publication Number Publication Date
WO2000031495A1 true WO2000031495A1 (fr) 2000-06-02

Family

ID=10827272

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1998/003538 WO2000031495A1 (fr) 1998-11-26 1998-11-26 Dispositif pyrotechnique et son contenant

Country Status (2)

Country Link
AU (1) AU1251699A (fr)
WO (1) WO2000031495A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008092282A1 (fr) * 2007-02-02 2008-08-07 Mattson Inter Tool Gmbh Cartouche de tir des mines et procédé de tir
WO2012095779A1 (fr) * 2011-01-11 2012-07-19 Green Break Technology Limited Abattage non explosif

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2723254C1 (ru) * 2019-10-31 2020-06-09 Сайдаш Асылович Кабиров Заряд сейсмический малогабаритный зсм-2

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1143841A (fr) * 1900-01-01
DE725103C (de) * 1941-03-16 1942-09-14 Otto Bonkowski Dipl Ing Handgranatentopf
GB1205378A (en) * 1969-02-10 1970-09-16 Asahi Chemical Ind Method of cracking concrete
FR2068166A5 (fr) * 1969-11-28 1971-08-20 Davey Bickford Smith Cie
US4000696A (en) * 1975-09-05 1977-01-04 Excoa, Inc. Cartridge for two component field mixed explosive
DE3143899A1 (de) * 1981-11-05 1983-06-23 Dynamit Nobel Ag, 5210 Troisdorf Verstaerkungsladung
WO1996026411A1 (fr) * 1995-02-24 1996-08-29 Clipmate Corp. Ensemble detonateur electrique et connecteur pour les conducteurs

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1143841A (fr) * 1900-01-01
DE725103C (de) * 1941-03-16 1942-09-14 Otto Bonkowski Dipl Ing Handgranatentopf
GB1205378A (en) * 1969-02-10 1970-09-16 Asahi Chemical Ind Method of cracking concrete
FR2068166A5 (fr) * 1969-11-28 1971-08-20 Davey Bickford Smith Cie
US4000696A (en) * 1975-09-05 1977-01-04 Excoa, Inc. Cartridge for two component field mixed explosive
DE3143899A1 (de) * 1981-11-05 1983-06-23 Dynamit Nobel Ag, 5210 Troisdorf Verstaerkungsladung
WO1996026411A1 (fr) * 1995-02-24 1996-08-29 Clipmate Corp. Ensemble detonateur electrique et connecteur pour les conducteurs

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008092282A1 (fr) * 2007-02-02 2008-08-07 Mattson Inter Tool Gmbh Cartouche de tir des mines et procédé de tir
US8028624B2 (en) 2007-02-02 2011-10-04 Mattson Inter Tool Gmbh Rock-blasting cartridge and blasting method
WO2012095779A1 (fr) * 2011-01-11 2012-07-19 Green Break Technology Limited Abattage non explosif
US8899154B2 (en) 2011-01-11 2014-12-02 Green Break Technology Limited Rock breaking
EP2474806A3 (fr) * 2011-01-11 2015-08-19 Green Break Technology Limited Cartouche pour casser de la roche

Also Published As

Publication number Publication date
AU1251699A (en) 2000-06-13

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