WO1995019539A1 - Dispositif de protection pour detonateur - Google Patents

Dispositif de protection pour detonateur Download PDF

Info

Publication number
WO1995019539A1
WO1995019539A1 PCT/AU1995/000008 AU9500008W WO9519539A1 WO 1995019539 A1 WO1995019539 A1 WO 1995019539A1 AU 9500008 W AU9500008 W AU 9500008W WO 9519539 A1 WO9519539 A1 WO 9519539A1
Authority
WO
WIPO (PCT)
Prior art keywords
detonator
protector
detonators
holder
protectors
Prior art date
Application number
PCT/AU1995/000008
Other languages
English (en)
Inventor
John Thomas Hedger
Original Assignee
Ici Australia Operations Proprietary Limited
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 Ici Australia Operations Proprietary Limited filed Critical Ici Australia Operations Proprietary Limited
Priority to AU14088/95A priority Critical patent/AU1408895A/en
Publication of WO1995019539A1 publication Critical patent/WO1995019539A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B39/00—Packaging or storage of ammunition or explosive charges; Safety features thereof; Cartridge belts or bags
    • F42B39/30—Containers for detonators or fuzes

Definitions

  • the present invention relates to a protector for detonators and a method of packaging detonators for transport and storage.
  • Detonators may be broadly divided into two types, either electric or non- electric, depending on the manner in which they are initiated. When detonators are attached to an initiation means such as electric leg-wires or signal tubing, the assembled unit is commonly termed a detonator assembly.
  • Electric detonators generally have a fusehead within the detonator shell, the fusehead being initiated by electric current transmitted along the legwires.
  • Non-electric detonators are commonly attached to a length of signal tubing, which comprises plastic tubing, lightly coated on the inside with a reactive powder which is capable of transmitting a shock wave to the detonator and thus initiating it.
  • detonators While many different types of detonators exist, those used for civilian purposes generally comprise only a delay element (which is optional), a priming charge and a base charge which are enclosed within a metal shell. When an initiating shock wave or electric current is transmitted to the detonator, the delay element burns, then the priming charge is initiated and finally the base charge in the closed end of the detonator shell explodes.
  • Detonators are often transported from one site to another in specially marked and fitted trucks which are exclusively dedicated to the transportation of explosives. Depending on local law, these trucks may be limited in the quantities of detonators carried, the times of travel on public roads and the number of escort vehicles required.
  • Legislation in most countries includes such specific requirements for the transportation of explosives to try and minimise the likelihood of initiation of a detonator in transit. Such events can have many causes including mishandling, lightning strike or road accident. Most countries base their legislative requirements for storage and transportation of explosives on the "Recommendations on the Transport of Dangerous Goods" issued by the United Nations plus the United Nations' prescribed testing codes for establishing the acceptability of various packaging and transportation methods for dangerous goods.
  • the packaging must necessarily prevent a detonator from initiating either the base charge or the initiation tubing of a significant number of other detonators in the bonfire test.
  • initiation tube which is generally made of plastic
  • initiation tube will melt and become non-functional before the temperature of the fire is high enough within the detonator to cause thermal initiation.
  • direct initiation of detonators by shrapnel and shock is the major incident to consider.
  • shrapnel When an unprotected detonator is initiated, the majority of shrapnel occurs in two distinct areas. The first is in a ring that flows out from near the top of the detonator base charge and the second is in the form of a slug emitted axially from the bottom of the detonator.
  • radial shrapnel can cause initiation of an adjacent detonator at 120 mm separation and the axial shrapnel can cause initiation at least up to 300 mm separation.
  • initiation of a receptor detonator appears to be of the order of 50 mm.
  • No.8 detonators with no initiation tubing attached have been stored in packages or blocks constructed of compressed paper. These packages are approximately 290 x 50 x 20 mm and holes 11 mm in diameter are drilled through the block in a pattern on 30 mm centres. The bottom of the block has a cardboard sheet stapled on and the top is covered with a cardboard sheet into which crosses are cut to line up with each hole. This allows the detonators to be pushed into the holes and be retained in place.
  • US Patent No. 5,133,258 discloses the use of a holder having an internal cavity and surrounded by concentric, cylindrical elastomeric walls which are spaced radially from one another by concentric cylindrical spaces or air gaps. In use, the detonator shell is flush with the walls of the cavity and this snug fit is sufficient to prevent the holder falling off the detonator.
  • detonators may be packaged in such a manner as to reduce the likelihood of detonator to detonator propagation of an explosion. This is primarily achieved by providing a free volume around the base charge of the detonator to allow for initial expansion of the products of a detonation .
  • the current invention therefore provides a protector for use in the transportation and storage of detonators comprising,
  • detonator holder which is open at one end for insertion of a detonator and closed at the other end, and which radially encloses the base charge of said detonator, at least one detonator retaining means integral with the detonator holder, and a first wall which is radially spaced around the holder, and wherein the holder and wall define a space,
  • the detonator retaining means holds the detonator within the holder such that a free volume is provided around the base charge of the detonator.
  • a method of packaging detonator assemblies by inserting detonators in the protector of the current invention and placing the protected detonators on either side of an insert in a packing case such that the detonators point away from the detonator initiation means. Using this packaging method the shrapnel and shock waves from an exploding base charge is unlikely to impinge upon the initiation means of the detonator assemblies.
  • the initiation means is signal tubing it is important that the detonators are positioned such that if one detonator explodes it will not cause a shock front to pass along the signal tubing of neighbouring assemblies and initiate their attached detonators. While this packing arrangement can also be used for electric detonators, the packing arrangement is clearly not critical because no matter how close a detonator explodes to leg-wires, the detonation will not cause any flow of electric current in the leg-wires.
  • the protector of the current invention provides for a free volume around the base charge of the detonator and this free volume may optionally extend along the entire length of the detonator shell.
  • the protector may optionally comprise at least one outer wall which is radially spaced about the first wall, each pair of adjacent walls defining a space.
  • the protector of the current invention comprises one outer wall and the protector is constructed of high density polyethylene (HDPE).
  • HDPE high density polyethylene
  • number 8* detonators (which comprise 780 milligrams of pentrerythritol tetranitrate, PETN) may be packed with an inter-detonator spacing of as little as 2 centimetres before a shock front from one detonator will initiate neighbouring detonators. Where no outer wall is provided the minimum inter-detonator spacing is 3.5 centimetres.
  • the detonator retaining means may comprise any conveniently configured projections on the interior of the holder. Fins extending the length of the interior of the holder are particularly preferred.
  • the protector of the current invention may be used as an independent unit or two or more may be joined together or manufactured together to form a set.
  • the protectors may be joined together by any convenient means such as sticking, heat welding or solvent welding protectors. Alternatively a single moulding or similar process may be used to form a set. Where the material of construction is an elastomeric substance the individual protectors may be joined by a web of the elastomer. Using sets of several protectors joined together may be advantageous where improved packing density is required.
  • the individual protectors or sets be located in alternate packing rows.
  • alternate packing rows refers to the packing in which no protector is located directly in alignment with other protectors in the rows above or below.
  • the protectors are packed in storage containers such as cardboard boxes or the like, by arranging a base layer of units in a close packed or square packed array, then placing a second layer of inverted units such that they fill or point towards the interstitial spaces of the base layer. A third layer of units repeats the arrangement of the base layer and a forth layer repeats the arrangement of the second layer.
  • This method of packaging is particularly useful for detonators without attached initiation means.
  • Various packing densities can be obtained depending on various parameters including the size of the detonator, the configuration of the protector, the dimensions of the packing case and the method of packaging of the current invention.
  • Figure 1 shows sectional views of one embodiment of the protector
  • Figure 2 depicts a plan view of an array of protectors
  • Figure 3 shows a sectional view along BB' of Figure 2
  • Figure 4 is a perspective view of detonator assemblies in a packaging case.
  • Figure 1(a) clearly shows a cylindrical detonator holder (1) having an open end (la) and a closed end (lb) within which is located a detonator retaining means comprising several fins (2) which are integral with the interior of the detonator holder.
  • a wall (3) is radially spaced around the holder and the holder and wall define a space (4). The top of the wall and the holder form a junction (5).
  • Figure 1(b) is a cross sectional view along AA' of Figure 1(a) and shows the wall (3), the holder (1) and the fins (2).
  • a detonator would be pushed into the holder and held in place by the fins, the space between the detonator shell and the holder forming a free volume.
  • Figure 2 depicts a set of individual protectors (6) held together by a web of material (7) to form an array.
  • the protectors are constructed of plastic, the entire array could be formed by a single injection moulding process with a web of the plastic joining individual protectors.
  • detonator shells would be placed in the holders (1), the tops of the detonator shells projecting above the tops of the protectors.
  • the tops of the detonator shells would be located in the interstitial space (8).
  • Figure 3 is a cross sectional view along BB' of Figure 2 with detonators inserted in the protectors.
  • the detonators are depicted in cross section to show each base charge (9a), priming charge (9b) and delay element (9c) located within each detonator shell (9d).
  • Figure 4 depicts detonator assemblies packed in a box (10) using a preferred packaging method.
  • the box includes an insert (11) about which the detonator assemblies (12) are packed.
  • the initiation means (12b) of each assembly is formed into a loop and each detonator (12a) is located in a protector (13).
  • Bundles of detonator assemblies are held together by a rubber band (12c) located around their looped initiation means. As shown in the diagram, bundles of detonator assemblies are packed with their detonators on alternate sides of the insert, the detonators pointing away from the loops of initiation means.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Buffer Packaging (AREA)

Abstract

Ce dispositif de protection, destiné à être utilisé dans le transport et le stockage de détonateurs, comprend un logement porteur (1) ouvert sur une de ses extrémités (1a) afin de permettre l'insertion d'un détonateur, et fermé sur l'autre extrémité (1b), et qui enferme radialement la charge de base (9a) du détonateur, au moins un élément de retenue d'un détonateur, monobloc avec le logement porteur, ainsi qu'une première paroi (3) espacée radialement autour du logement porteur (1) et qui détermine avec le logement porteur (1) un espace (4) dans lequel, lors de l'utilisation du dispositif, les moyens de retenue du détonateur maintiennent le détonateur dans le logement porteur (1), de telle manière qu'un volume libre est constitué autour de la charge de base (9a) du détonateur.
PCT/AU1995/000008 1994-01-14 1995-01-10 Dispositif de protection pour detonateur WO1995019539A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU14088/95A AU1408895A (en) 1994-01-14 1995-01-10 Detonator protector

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AUPM3378 1994-01-14
AUPM3378A AUPM337894A0 (en) 1994-01-14 1994-01-14 Detonator protector

Publications (1)

Publication Number Publication Date
WO1995019539A1 true WO1995019539A1 (fr) 1995-07-20

Family

ID=3778001

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU1995/000008 WO1995019539A1 (fr) 1994-01-14 1995-01-10 Dispositif de protection pour detonateur

Country Status (4)

Country Link
AU (1) AUPM337894A0 (fr)
CA (1) CA2139799A1 (fr)
WO (1) WO1995019539A1 (fr)
ZA (1) ZA95184B (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008116430A2 (fr) 2007-03-27 2008-10-02 Austin Detonator S.R.O. Emballage de produits explosifs avec une résistance améliorée à la transmission de la détonation, élément protecteur individuel et élément protecteur collectif pour cet emballage
US8006622B2 (en) 2006-11-07 2011-08-30 Orica Explosives Technology Pty Ltd Protector for detonator, and method of use
RU2674163C1 (ru) * 2017-08-28 2018-12-05 Акционерное общество "Новосибирский механический завод "Искра" Защитная сборка для детонаторов
CN113587747A (zh) * 2021-08-24 2021-11-02 六盘水华安爆破工程有限公司 一种适用于自动化装填的电子雷管仓储装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5052549A (en) * 1991-02-27 1991-10-01 Scharch Daniel J Tray for ammunition cartridges
US5133258A (en) * 1991-02-28 1992-07-28 The United States Of America As Represented By The Secretary Of The Navy Nonpropagating holder and package for explosive devices

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5052549A (en) * 1991-02-27 1991-10-01 Scharch Daniel J Tray for ammunition cartridges
US5133258A (en) * 1991-02-28 1992-07-28 The United States Of America As Represented By The Secretary Of The Navy Nonpropagating holder and package for explosive devices

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8006622B2 (en) 2006-11-07 2011-08-30 Orica Explosives Technology Pty Ltd Protector for detonator, and method of use
WO2008116430A2 (fr) 2007-03-27 2008-10-02 Austin Detonator S.R.O. Emballage de produits explosifs avec une résistance améliorée à la transmission de la détonation, élément protecteur individuel et élément protecteur collectif pour cet emballage
WO2008116430A3 (fr) * 2007-03-27 2009-01-08 Austin Detonator Sro Emballage de produits explosifs avec une résistance améliorée à la transmission de la détonation, élément protecteur individuel et élément protecteur collectif pour cet emballage
RU2674163C1 (ru) * 2017-08-28 2018-12-05 Акционерное общество "Новосибирский механический завод "Искра" Защитная сборка для детонаторов
CN113587747A (zh) * 2021-08-24 2021-11-02 六盘水华安爆破工程有限公司 一种适用于自动化装填的电子雷管仓储装置

Also Published As

Publication number Publication date
CA2139799A1 (fr) 1995-07-15
AUPM337894A0 (en) 1994-02-10
ZA95184B (en) 1995-10-17

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