WO2006055991A1 - Detonateur - Google Patents

Detonateur Download PDF

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Publication number
WO2006055991A1
WO2006055991A1 PCT/ZA2005/000170 ZA2005000170W WO2006055991A1 WO 2006055991 A1 WO2006055991 A1 WO 2006055991A1 ZA 2005000170 W ZA2005000170 W ZA 2005000170W WO 2006055991 A1 WO2006055991 A1 WO 2006055991A1
Authority
WO
WIPO (PCT)
Prior art keywords
detonator
locating
signal
misfired
circuit
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.)
Ceased
Application number
PCT/ZA2005/000170
Other languages
English (en)
Inventor
Andre Louis Koekemoer
John Francis Burrows
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.)
Detnet International Ltd
Original Assignee
Detnet International 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 Detnet International Ltd filed Critical Detnet International Ltd
Publication of WO2006055991A1 publication Critical patent/WO2006055991A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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
    • F42B3/10—Initiators therefor
    • F42B3/12—Bridge initiators
    • F42B3/121—Initiators with incorporated integrated circuit

Definitions

  • This invention relates generally to a detonator and more particularly is concerned with a detonator which misfires during use.
  • a blasting system may make use of a large number of detonators which are individually activated or initiated under controlled conditions to fire explosives. Due to manufacturing, environmental or other factors a detonator may misfire. When this occurs a potentially dangerous situation arises in that the detonator may well be set off thereafter by secondary factors e.g. during mining operations. A similar consideration applies in respect of the explosive which is associated with the detonator which can be inadvertently fired by external factors. Clearly this type of situation should be avoided.
  • the blasting system may make use of hundreds or even thousands of detonators which are installed in respective blast holes over a large area and the appearance of the area may be modified substantially as the result of explosion caused by those detonators which are successfully ignited.
  • the invention provides, in the first instance, a detonator which includes a housing, at least a primary explosive in the housing, a control circuit for controlling the initiation of the primary explosive, and a locating circuit which, when activated, emits a locating signal which is associated with the detonator.
  • the locating signal may be emitted wirelessly at any suitable frequency.
  • the locating signal may be encoded in a manner which provides a unique association between the locating signal and the detonator.
  • the locating signal may for example be encoded with a unique identifier which may be in the form of a digital or other code.
  • the unique identifier may be derived from, or be the same as, an identifier which is held or stored in suitable memory of the control circuit.
  • the locating signal is at a predetermined frequency.
  • the locating signal may be emitted continuously or intermittently.
  • the locating signal may be emitted in response to an interrogating signal.
  • the locating circuit may be in the nature of a transponder which may be active or passive. In the latter case the locating circuit has no specific on-board energy circuit.
  • the invention also extends to a method of detecting a misfire in a blasting system which includes a plurality of detonators each of which is arranged, upon activation, to detonate a respective quantity of explosives, the method including the step of generating, in respect of each detonator which has not fired, a locating signal which enables the misfired detonator to be located.
  • the locating signal may be generated in accordance with any suitable set of predetermined criteria.
  • the method may include the step, after activation of the plurality of detonators, of generating at least one interrogating signal which, if received by a detonator which has misfired, causes a locating circuit which is associated with the detonator to emit a locating signal which is associated with the detonator.
  • a detonator when armed, is supplied with energy which is stored at least in two energy storage devices. Energy from a first storage device is used to initiate an explosive. If the explosive is successfully initiated then the detonator, in the resulting explosion, is destroyed. If the explosive is not initiated then the energy in the second energy storage device remains in the energy storage device and this can be used, at least for a limited time period, to power a transmitter which enables the misfired detonator to be identified or located.
  • Figure 1 is a schematic view in cross section of a detonator according to the invention.
  • Figure 2 shows a part of a typical blasting system
  • Figure 3 illustrates a part of a circuit of the detonator of the invention and the use thereof to locate a misfired detonator.
  • FIG. 1 of the accompanying drawings illustrates a detonator 10 which includes a housing 12 in which is located a primary explosive 14, an electronic detonating circuit 16 and a locating circuit 18.
  • Wires 20 are connected at least to the circuit 16 and are used to power and control the arming and firing of the detonator in a conventional manner which is not further described herein.
  • the circuit 16 includes a bridge component 22 which is directly exposed to the primary explosive 14 and which, when fired, causes the primary explosive to initiate.
  • Figure 2 illustrates a part of a typical blasting system 30.
  • a plurality of boreholes 32 are formed at respective predetermined locations in ground 34 which is to be blasted.
  • a secondary explosive 36 is placed in each borehole together with an associated detonator 10.
  • the wires 20 which extend from the detonators are connected to a blasting harness 38 which extends from blast control equipment, not shown, in a manner which is known in the art.
  • FIG. 3 illustrates a part of circuitry 42 in the detonator 10.
  • the locating circuit 18 is in the nature of a passive transponder and includes a receiver 44 which is connected to a small antenna 46, an energy circuit 48 and a transmitter 50. The transmitter may be connected to or embody an oscillator 52.
  • FIG. 3 Also shown in Figure 3 are blocks designated 54, 56, 58 and 60. These blocks, the nature and function of which are further described hereinafter, form part of a second embodiment of the invention and do not play a role in the understanding of the embodiment which is currently described.
  • a search unit 66 see Figure 3 is employed.
  • the search unit includes a battery 68 which powers a transmitter/receiver unit 70 which is connected to an antenna 72.
  • the transmitter When the transmitter is energised it emits a signal which is received by the antenna 46 of the misfired detonator, and passed to the receiver 44 which transfers the signal to the energy unit 48.
  • a circuit which normally
  • the transmitter 50 is in the form of a plurality of coils, with a rectifier, extracts energy from the received signal and converts the extracted energy to a form which is suitable for powering the transmitter 50.
  • the transmitter 50 automatically functions when power is applied to it and, in this example, the oscillator 52 which is embodied in the transmitter then generates a signal at a predetermined frequency which is emitted via the antenna 46.
  • the circuit 42 thus functions as a passive transducer in that it emits a distinct signal, which is readily identifiable, in response to an interrogating signal transmitted by the search unit 66.
  • the emitted signal is detected by the antenna 72 and applied to the receiver 70 which processes the signal and outputs a suitable indicating signal 20 to a unit 80 which may include a display 82 or a sound generator or any other appropriate indicating device 84.
  • the search unit 66 may be a relatively low power device so that it must be brought fairly close to a misfired detonator in order to activate the corresponding transmitter 50. This ensures that the location of the misfired detonator is readily ascertainable and, if there are two or more misfired detonators, it normally will be possible easily to distinguish the misfired detonators from each other.
  • the detonator control circuit 16 which corresponds in substance to the block 56 in Figure 3, includes a module 54 in which is held a code which is a unique identifier for the detonator. If the detonator misfires then the module 54 is not destroyed and the code is preserved.
  • the code can be applied to the transmitter 50 so that the same identifier which is used during the programming of the detonator is emitted in response to an interrogating signal to enable the identity of the misfired detonator and its location to be ascertained.
  • energy from the blast control equipment is normally transferred to each of the detonators during testing, programming and arming modes. Once a detonation sequence commences the on ⁇ board energy held at each detonator is used to fire the corresponding bridge circuit 22.
  • energy which is made available during the testing, programming and arming modes is effectively divided into two in that a first quantity of energy is stored in the module 58 while a second quantity of energy is stored in the module 60. The energy which is stored in the module 58 is used to power the circuit 16 and fire the bridge 22 when necessary. If the detonator is successfully fired then, clearly, the detonator is destroyed.
  • the detonator may automatically emit one or more locating signals after a predetermined period of time has elapsed from the time at which the detonator would have fired if the firing process had been successful.
  • This signal can be at the frequency of the oscillator 52 or it may contain the unique identifier held in the module 54.
  • the signal can be generated independently and automatically to alert an operator to the fact that a misfire has occurred and the operator can then, if necessary, make use of the search unit 66 to locate the misfired detonator in the manner which has already been described.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Bags (AREA)

Abstract

Détonateur comprenant un boîtier, explosif primaire logé dans ledit boîtier, un circuit de commande déclenchant l'allumage de l'explosif primaire, et un circuit de localisation qui émet , lorsqu'il est sollicité, un signal de localisation associé au détonateur.
PCT/ZA2005/000170 2004-11-22 2005-11-17 Detonateur Ceased WO2006055991A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA2004/9374 2004-11-22
ZA200409374 2004-11-22

Publications (1)

Publication Number Publication Date
WO2006055991A1 true WO2006055991A1 (fr) 2006-05-26

Family

ID=35985222

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/ZA2005/000170 Ceased WO2006055991A1 (fr) 2004-11-22 2005-11-17 Detonateur

Country Status (2)

Country Link
WO (1) WO2006055991A1 (fr)
ZA (1) ZA200701067B (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009025562A1 (fr) * 2007-08-21 2009-02-26 Viking Technology As Dispositif d'explosion
CN102435111A (zh) * 2011-11-02 2012-05-02 武汉理工大学 爆破网路控制检测方法
WO2014055024A1 (fr) * 2012-10-03 2014-04-10 Luossavaara-Kiirunavaara Ab Procédé et agencement pour détecter la détonation d'un explosif
WO2018058198A1 (fr) * 2016-09-29 2018-04-05 Bhp Billiton Innovation Pty Ltd Techniques de sautage
WO2022272315A1 (fr) * 2021-06-21 2022-12-29 Detnet South Africa (Pty) Ltd Confirmation d'explosion

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1006089B (de) * 1954-11-12 1957-04-11 Herbert Friedl Verfahren zur Feststellung nicht detonierter Sprengladungen und Sonde zur Durchfuehrung des Verfahrens
US3554299A (en) * 1968-09-19 1971-01-12 Aquatech Corp Well-perforating tool
US4063510A (en) * 1975-08-29 1977-12-20 Taisei Kensetsu Kabushiki Kaisha Process for detecting a misfired explosive
US4208966A (en) * 1978-02-21 1980-06-24 Schlumberger Technology Corporation Methods and apparatus for selectively operating multi-charge well bore guns
US4363678A (en) * 1980-12-17 1982-12-14 Tohoku Metal Industries Explosives having powdered ferrite magnet as a tracer dispersed therethrough and a method for producing the same
EP0129350A2 (fr) * 1983-06-20 1984-12-27 Geo Vann, Inc. Procédé et dispositif de détection de la mise à feu d'un canon perforateur de puits
US20030168213A1 (en) * 2002-02-01 2003-09-11 Geo-X Systems, Ltd. Extent of detonation determination method using seismic energy

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1006089B (de) * 1954-11-12 1957-04-11 Herbert Friedl Verfahren zur Feststellung nicht detonierter Sprengladungen und Sonde zur Durchfuehrung des Verfahrens
US3554299A (en) * 1968-09-19 1971-01-12 Aquatech Corp Well-perforating tool
US4063510A (en) * 1975-08-29 1977-12-20 Taisei Kensetsu Kabushiki Kaisha Process for detecting a misfired explosive
US4208966A (en) * 1978-02-21 1980-06-24 Schlumberger Technology Corporation Methods and apparatus for selectively operating multi-charge well bore guns
US4363678A (en) * 1980-12-17 1982-12-14 Tohoku Metal Industries Explosives having powdered ferrite magnet as a tracer dispersed therethrough and a method for producing the same
EP0129350A2 (fr) * 1983-06-20 1984-12-27 Geo Vann, Inc. Procédé et dispositif de détection de la mise à feu d'un canon perforateur de puits
US20030168213A1 (en) * 2002-02-01 2003-09-11 Geo-X Systems, Ltd. Extent of detonation determination method using seismic energy

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009025562A1 (fr) * 2007-08-21 2009-02-26 Viking Technology As Dispositif d'explosion
EP2195579A4 (fr) * 2007-08-21 2013-03-20 Viking Technology As Dispositif d'explosion
CN102435111A (zh) * 2011-11-02 2012-05-02 武汉理工大学 爆破网路控制检测方法
WO2014055024A1 (fr) * 2012-10-03 2014-04-10 Luossavaara-Kiirunavaara Ab Procédé et agencement pour détecter la détonation d'un explosif
WO2018058198A1 (fr) * 2016-09-29 2018-04-05 Bhp Billiton Innovation Pty Ltd Techniques de sautage
WO2022272315A1 (fr) * 2021-06-21 2022-12-29 Detnet South Africa (Pty) Ltd Confirmation d'explosion
US12510341B2 (en) 2021-06-21 2025-12-30 Detnet South Africa (Pty) Ltd Blast confirmation

Also Published As

Publication number Publication date
ZA200701067B (en) 2008-05-28

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