EP2568838B1 - Sprengstoffzünder - Google Patents
Sprengstoffzünder Download PDFInfo
- Publication number
- EP2568838B1 EP2568838B1 EP11728166.7A EP11728166A EP2568838B1 EP 2568838 B1 EP2568838 B1 EP 2568838B1 EP 11728166 A EP11728166 A EP 11728166A EP 2568838 B1 EP2568838 B1 EP 2568838B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- housing
- explosive
- rfid
- time delay
- initiator
- 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.)
- Not-in-force
Links
Images
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
- F42B3/10—Initiators therefor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D1/00—Blasting methods or apparatus, e.g. loading or tamping
- F42D1/04—Arrangements for ignition
- F42D1/045—Arrangements for electric ignition
- F42D1/05—Electric circuits for blasting
- F42D1/055—Electric circuits for blasting specially adapted for firing multiple charges with a time delay
Definitions
- This invention relates to an explosive initiator which lends itself for use in a system in which the initiator can be identified and tracked, as described in WO2006/128257A .
- an identifier such as a barcode is attached to a detonator. This type of marking is however easily removed or overcome.
- an electronic detonator typically includes a microprocessor or a similar component which is capable of storing an identity number for the detonator. The identity number does identify the detonator but, usually, a connection must be made to the detonator to read the identity number.
- An object of the present invention is to provide an explosive initiator which can be identified remotely with relative ease.
- the invention provides an explosive initiator according to claim 1.
- RFID denotes a radio frequency identification device. This type of device is known in the art and for this reason is not described in detail herein.
- a passive transponder which, in response to an interrogating signal of a particular kind, emits a unique signal, which may be encoded, which determines the identity of the device.
- the RFID is embedded wholly in the non-electrically conductive material.
- non-electrically conductive means that the material in question is an electrical insulator and thus does not exhibit a capability of conducting electrical current.
- the housing may be of any suitable shape and form and preferably is tubular with an open end and a blind end.
- the housing includes a portion which is made from a metallic material and the time delay component is positioned wholly inside this portion. A remainder of the housing, to which the RFID is secured in the manner described, is then made from a non-electrically conductive material.
- the explosive initiator includes a thermal insulator which forms a thermal barrier between the time delay component and at least part of the housing.
- the thermal insulator may be made from any appropriate material which is capable of withstanding high temperatures for a period of several seconds.
- a suitable material is a high alumina ceramic.
- the explosive composition can take on any appropriate form and may include a primary explosive, or a secondary explosive, or an appropriate combination of a primary explosive and a secondary explosive.
- the invention is not limited in this respect.
- the time delay component is preferably located at an open end of the tubular housing.
- An appropriate connector or seal may be attached to this end to allow the time delay component to be ignited using a suitable technique.
- the time delay component may be ignited by means of energy from a shock tube.
- the time delay component is ignited by actuating an electrical element which is exposed to the time delay component. Leads to the electrical element may extend through an appropriate seal fixed to the housing.
- FIG. 1 of the accompanying drawings illustrates from one side and in cross-section an explosive initiator 10, also referred to as a detonator, according to the invention.
- the initiator includes an elongate tubular housing 12 which has an open end 14 and a blind end 16.
- a secondary explosive 20 is packed into the tubular housing, adjacent the blind end 16. This is followed by a quantity of primary explosive 32.
- the natures of the primary explosive and of the secondary explosive, the quantities thereof placed in the housing and the manner in which such placements are effected, are aspects which are known in the art and, for this reason, are not further described herein.
- a time delay element 34 is positioned inside a holder 36 located within the housing 12 adjacent one end of the primary explosive 32.
- the time delay element is a thermal preparation which, upon ignition at an end 38, burns at a predictable rate with a burn front moving in a longitudinal direction of the element towards an interface 40 between the element and the primary explosive 32. When the burning front reaches the interface the primary explosive is ignited and this is followed by ignition of the secondary explosive.
- An RFID 44 of a kind known in the art, is embedded wholly within the material of the housing 12.
- the RFID is notionally shown only for, in practice, it can take on a plurality of different forms.
- the RFID is used to identify the detonator in a unique manner.
- the RFID should be associated with the detonator in a way which prevents the RFID from being removed from the detonator while leaving the detonator intact.
- the RFID is embedded wholly inside the material from which the housing 12 is made.
- This housing is made from a non-electrically conductive material so that radio signals to, and from, the RFID are not subjected to electromagnetic screening as would be the case if the housing were made from an electrically conductive material.
- Suitable non-electrically conductive materials for forming the housing are paper, cardboard, non-conductive carbon fibre, ceramic and a suitable plastic or polymeric material.
- the delay element 34 may for example have a lead-based composition, be formed from a "green” material or a nano-material such as porous silicon, or be polymer-based.
- a common characteristic of time delay elements is that when the elements burn, temperatures of over 1000 °C can be generated. This can be over a time period of several seconds, say up to 9 seconds.
- the materials referred to hereinbefore, from which the housing 12 is made, are not able to withstand such temperatures.
- the delay element 34 burns, it generates gases which can influence the rate of flame propagation through the delay element. For a predictable delay time it is important that the gases are contained and do not vent through a containing body.
- the holder 36 is made from a thermal insulator such as a high alumina ceramic material with a suitable wall thickness 50.
- the holder is cup-shaped with a base 54 in which is formed a relatively small, centrally positioned hole 56.
- An end 58 of the holder, opposing the base, is open. This facilitates the manufacturing process for the material which comprises the time delay element can be packed into the holder through the open end 58 and compacted as required.
- the holder 36 with its contents is placed over the primary explosive 32.
- An ignition component 60 which is notionally shown only, is engaged with the hole 56 and is sealed thereto using an appropriate sealing technique based, for example, on the use of a laser, a chemical or heat treatment process, a mechanical process, an ultrasonic or ultraviolet bonding technique, or the like.
- the ignition component 60 can include an electrical element which is heated through the application of a control voltage via electrical leads, or it could comprise an appropriate connector which facilitates connection of the device 10 to an end of a shock tube. Other techniques can be employed if necessary.
- the detonator once installed in a blast hole, is used in a substantially conventional manner in that, when required, the ignition component 60 ignites the time delay element 34 by means of thermal energy or a shock wave which is passed through the opening 56.
- the utility of the invention lies in the incorporation of the RFID in the housing.
- the RFID is engaged with the housing in such a manner that it cannot be detached from the housing without compromising the integrity of the initiator.
- the RFID is surrounded by non-electrically conductive material.
- the high temperature, time delay element is enclosed in a thermal barrier (the holder 36) so that the housing 12 is protected against melting or burning until such time as the primary and secondary explosives are initiated.
- the RFID 44 means that it is possible to determine the identity of a detonator in a wireless and contactless manner. This feature facilitates inventory control. Unauthorized use or movement of a detonator can also be detected, with relative ease, through the use of suitably positioned RFID interrogating structures.
- Figure 2 shows an initiator 10A, not forming part of the invention, wherein an RFID 44 is embedded in a secondary explosive 20. Another possibility is to place the RFID in a primary explosive, or to attach the RFID to an inner wall surface 46 of an initiator housing. Normally the RFID would not be attached to an outer surface 48 of the housing for, conceivably, it could then be detached from the housing.
- Figure 3 shows another initiator not forming part of the invention which has a number of similarities to the construction shown in Figure 1 and, for this reason, like reference numerals are used in Figure 3 to designate components which are the same as those shown in Figure 1 .
- FIG. 1 the housing 12 is integrally formed, for example, from a suitable plastics material.
- Figure 3 shows an initiating device 10B which has a housing 12A formed from a tubular, open-ended metallic sleeve 70 e.g. of copper or aluminium, and a second portion 72, with a blind end 16, which is made from a non-electrically conductive material, such as a suitable plastics material.
- An RFID 44 is embedded in a wall of the portion 72.
- a time delay element 34 is wholly enclosed in the metallic sleeve and is capped by a cover 74.
- the metallic sleeve is well able to withstand the high temperatures which are produced during burning of the element 34. Thus the thermal insulating holder 50 is not required.
- the sleeve 70 is fixed to the component 72 at a junction 76 in a manner which effectively prevents detachment of the sleeve from the plastic component which houses the primary explosive 32 and the secondary explosive 20.
- the explosive initiator 10B thus has a housing with a two-part construction.
- One part of the housing is designed to withstand the effects of heat arising upon initiation of a thermal time delay element while a remainder of the housing, which is non-electrically conductive, is adapted to accommodate the RFID.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Geophysics And Detection Of Objects (AREA)
- Air Bags (AREA)
- Fuses (AREA)
- Pressure Welding/Diffusion-Bonding (AREA)
- Constitution Of High-Frequency Heating (AREA)
Claims (2)
- Sprengstoffzünder mit einem aus nicht elektrisch leitenden Material hergestellten Gehäuse (12), einer thermischen Zeitverzögerungskomponente (34) und mindestens einer explosiven Zusammensetzung (32) innerhalb des Gehäuses (12), und einer Funkfrequenz-Identifikationseinrichtung (44) innerhalb des Gehäuses (12), dadurch gekennzeichnet, dass die Zeitverzögerungskomponente (34) von einer Wärmesperre (36) umschlossen ist, so dass das Gehäuse (12) so lange gegen Schmelzen oder Brennen geschützt ist, bis die mindestens eines explosive Zusammensetz7ung (32) gezündet wird.
- Zünder nach Anspruch 1, dadurch gekennzeichnet, dass die Funkfrequenz-Identifikationseinrichtung (44) vollständig in das nicht-elektrisch leitende Material eingebettet ist.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PL11728166T PL2568838T3 (pl) | 2010-05-14 | 2011-05-09 | Inicjator detonacji |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ZA201003400 | 2010-05-14 | ||
PCT/ZA2011/000034 WO2011143679A1 (en) | 2010-05-14 | 2011-05-09 | Explosive initiator |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2568838A1 EP2568838A1 (de) | 2013-03-20 |
EP2568838B1 true EP2568838B1 (de) | 2015-09-30 |
Family
ID=44514198
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP11728166.7A Not-in-force EP2568838B1 (de) | 2010-05-14 | 2011-05-09 | Sprengstoffzünder |
Country Status (8)
Country | Link |
---|---|
EP (1) | EP2568838B1 (de) |
AP (1) | AP3734A (de) |
AR (1) | AR081915A1 (de) |
AU (1) | AU2011252818B2 (de) |
ES (1) | ES2550830T3 (de) |
PL (1) | PL2568838T3 (de) |
WO (1) | WO2011143679A1 (de) |
ZA (1) | ZA201208551B (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2014055024A1 (en) * | 2012-10-03 | 2014-04-10 | Luossavaara-Kiirunavaara Ab | Method and arrangement for detecting an explosive detonation |
AU2014357421B2 (en) | 2013-12-02 | 2017-09-14 | Austin Star Detonator Company | Method and apparatus for wireless blasting |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA2608727A1 (en) * | 2005-05-17 | 2006-11-23 | Explo Track, Llc | System and method for detecting, monitoring, tracking and identifying explosive materials |
BRPI0611513A2 (pt) * | 2005-06-02 | 2010-09-14 | Global Tracking Solutions Pty | iniciador de explosivos, sistema e método para monitorar iniciadores identificáveis |
ES2265769B1 (es) * | 2005-07-14 | 2008-01-16 | Arquimedia Ingenieria S.L. | Sistema y procedimiento para el control de explosivos encartuchados. . |
EP2350560B1 (de) * | 2008-10-24 | 2016-02-17 | Battelle Memorial Institute | Elektronisches sprengzündersystem |
-
2011
- 2011-05-09 EP EP11728166.7A patent/EP2568838B1/de not_active Not-in-force
- 2011-05-09 AU AU2011252818A patent/AU2011252818B2/en not_active Ceased
- 2011-05-09 WO PCT/ZA2011/000034 patent/WO2011143679A1/en active Application Filing
- 2011-05-09 ES ES11728166.7T patent/ES2550830T3/es active Active
- 2011-05-09 AP AP2012006567A patent/AP3734A/en active
- 2011-05-09 PL PL11728166T patent/PL2568838T3/pl unknown
- 2011-05-13 AR ARP110101669A patent/AR081915A1/es not_active Application Discontinuation
-
2012
- 2012-11-14 ZA ZA2012/08551A patent/ZA201208551B/en unknown
Also Published As
Publication number | Publication date |
---|---|
ES2550830T3 (es) | 2015-11-12 |
AU2011252818A1 (en) | 2012-12-06 |
AU2011252818B2 (en) | 2015-07-16 |
WO2011143679A1 (en) | 2011-11-17 |
ZA201208551B (en) | 2013-09-25 |
EP2568838A1 (de) | 2013-03-20 |
AR081915A1 (es) | 2012-10-31 |
PL2568838T3 (pl) | 2016-01-29 |
AP2012006567A0 (en) | 2012-12-31 |
AP3734A (en) | 2016-06-30 |
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