EP0241151A1 - Sprengvorrichtung - Google Patents

Sprengvorrichtung Download PDF

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Publication number
EP0241151A1
EP0241151A1 EP87302126A EP87302126A EP0241151A1 EP 0241151 A1 EP0241151 A1 EP 0241151A1 EP 87302126 A EP87302126 A EP 87302126A EP 87302126 A EP87302126 A EP 87302126A EP 0241151 A1 EP0241151 A1 EP 0241151A1
Authority
EP
European Patent Office
Prior art keywords
delay
explosive
delay element
blasting
programmable
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.)
Granted
Application number
EP87302126A
Other languages
English (en)
French (fr)
Other versions
EP0241151B1 (de
Inventor
Timothy Andrew Beattie
Stewart Grant Hamilton
Mark Andrew Irving
Barry Keith Miskin
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.)
Orica Ltd
Original Assignee
ICI Australia 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
Priority claimed from AU69653/87A external-priority patent/AU585701B2/en
Application filed by ICI Australia Ltd filed Critical ICI Australia Ltd
Priority to AT87302126T priority Critical patent/ATE58236T1/de
Publication of EP0241151A1 publication Critical patent/EP0241151A1/de
Application granted granted Critical
Publication of EP0241151B1 publication Critical patent/EP0241151B1/de
Expired legal-status Critical Current

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Classifications

    • 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

Definitions

  • This invention relates to a method of blasting.
  • each detonator with an electronic programmable delay which can be programmed prior to detonation by signals sent from a central command point via electrical wiring or by a "wireless" means such as radio or electromagnetic induction.
  • a major handicap is the fact that such a detonator must have a power source (generally a battery) - the presence of such a source in a charge of explosive is limiting because of its definite lifetime and the inability to replace it; it may also constitute a potential hazard.
  • detonator which seeks to overcome these problems is to be found in PCT published Application WO 87/00264, wherein is described a detonator which has a delay which is electronically programmable.
  • the detonators described in this document are preferably modular, one of the possible modules being a power source such as a capacitor. This power source can be charged up immediately prior to firing and provides the power for operating the delay and firing the detonator.
  • a power source such as a capacitor.
  • This power source can be charged up immediately prior to firing and provides the power for operating the delay and firing the detonator.
  • One basic problem with such a detonator is that they are relatively expensive, and expense is a big factor when blasts involving hundreds or even thousands of charges are being contemplated.
  • a method of blasting wherein an explosive is detonated by detonation means responsive to a firing signal from a remote command source, the detonation means comprising (a) within the explosive a detonator, a first delay element associated therewith and capable of actuating the detonator at a prescribed time after receiving the firing signal and a passive power storage device; (b) at the surface of the explosive a power source, a means for receiving signals, and a second delay element associated therewith and capable of delaying the time between receipt of the firing signal at (b) and detonation, and (c) means for communicating signals from (b) to (a).
  • a blasting apparatus for use in the firing of an explosive charge, the apparatus comprising (a) within the explosive a detonator, a first delay element associated therewith capable of actuating the detonator at a prescribed time after receiving the firing signal, and a passive power storage device, (b) at the surface of the explosive a power source, a means for receiving signals, and a delay element associated therewith and capable of delaying the time between receipt of the firing signal at (b) and detonation, and (c) means for communicating signals from (b) to (a).
  • the method of the present invention permits considerable versatility in all aspects of blasting.
  • the detonators and charges can be laid and left for a considerable time before firing, without there being any danger of premature accidental detonation or deterioration with age of any buried detonation component.
  • the method of this invention involves the use with each explosive charge of two sets of components, the components (a) within the explosive and the components (b) at the surface of the explosive.
  • the components (b) are at the ground surface or rock face and in close proximity to the charge with which they are associated. They may be physically on top of the explosive of the charge or they may be on the ground near the charge. The important thing is that the components (b) be readily accessible for the purposes of communication, or for maintenance or replacement of components.
  • the detonators for use in this invention can be any of those known to the art, for example, conventional bridgewire detonators, exploding bridgewire detonators and flying plate (“slapper”) detonators.
  • the first delay element associated with the detonator may be one of the many types of delay known to the art, for example, the simple pyrotechnic delay which is often integral with its associated detonator. It may also be electronic; it may be, for example, a sophisticated actuator such as that described in PCT Published Applications WO 87/00264 and WO 87/00265. However, one of the strengths of this invention is that relatively unsophisticated (and therefore inexpensive) components can be used in its performance.
  • the first delay element may be an electronic type whose delay is fixed; such delays are cheaper than programmable ones, and their use in large numbers is more financially acceptable.
  • passive power source we mean a power source which is capable of delivering power only when it itself is acted upon by an external stimulus.
  • a conventional battery with a remotely activatable on-off switch is not a passive power source as the battery is always capable of deliv­ering power. Indeed, such an arrangement negates one of the advantages of our invention.
  • Our preferred power source is a capacitor, but other possible power sources are rechargeable batteries and batteries which are passive until activated.
  • the power source for the passive power storage device is at the surface where it can be easily removed or replaced, and where any malfunction on its part can readily be made good. It may be, for example, a permanent power source such as a battery or an array of solar cells. On the other hand it itself may be a temporary power source or merely a receiving point for power transmitted from elsewhere, for example, through wiring or optical fibres, or via radio waves, electromagnetic induction or light, including laser light.
  • the means for communicating signals between the components of the system on the surface of the explosive and those within the explosive can be any convenient means available to the art. It may be, for example, a direct connection such as electrical wiring or optical fibre, or it may be via a form of radiation such as radio waves or electromagnetic induction. We prefer the direct connection because it is cheaper and it is easier (and again cheaper) to verify the status of the detonator.
  • the second delay element associated with the surface components capable of delaying the time between receipt of the firing signal at (b) and detonation may be selected from any suitable apparatus known to the art. It may, for example, have a fixed or a variable delay.
  • the second delay element has a variable delay and the first delay element has a fixed delay.
  • the second delay element is present at the surface, it is relatively easy to alter the delay time by simply changing the second delay element itself.
  • it be programmable, and more preferably remotely programmable.
  • the second delay element is remotely programmable and the first delay element is fixed. The embodiment confers considerable versatility on a blasting system; delays can be set at will and/or changed right up to the time of blasting, yet the fixed delay detonators are relatively inexpensive.
  • the signals for programming and firing may be communicated to the detonation means by any convenient method. It may be done, for example, by direct connection to a remote command source by wiring or optical fibres, or it may be done by "wireless" means, for example by radio or laser, or by a combination of these methods.
  • components 1-5 are underground and are linked to the components on the surface by connecting wires 6.
  • a fusehead 1, adapted to fire a detonator, is activated by an electronic power switch 2.
  • This power switch is controlled by a logic unit 4 whose function is to decode valid signals which are received from the surface via the interface 5.
  • This interface both conditions the signals from the surface for the logic unit 4 and extracts power to operate the underground components and fire the fusehead, this being stored in a temporary energy storage unit 3.
  • the unit 3 Prior to use, the unit 3 contains no energy.
  • the logic unit 4 comprises a fixed delay such that the unit will, on receiving a firing signal, retard firing by a fixed time.
  • the surface components which are directly connected to the underground components via the connecting wires 6 comprise an energy source 14 which is enabled by a switch 15 and which powers a line driver 7, a logic unit 8, a radio receiver 9 and a radio transmitter 10.
  • the transmitter 10 and receiver 9 are connected to an antenna 11 which receives signals from and transmits confirmatory signals to a blast controller 13 which transmits and receives via an antenna 12.
  • the logic unit 8 receives information from the receiver 9, decodes it and send it to the underground components via the line driver 7; it also confirms the receipt of the signal via the transmitter 10.
  • the logic unit comprises a programmable delay which can be set to any suitable delay time by means of instructions transmitted from blast controller 13.
  • the blast controller would first transmit programming instructions to the surface components. These would be received by the logic unit 8 whose programmable delay is set by them. The logic unit 8 then acknowledges via the transmitter that programming has been completed. When the firing signal is sent, the logic unit 8 will delay its onward communication to the underground components the delay time previously programmed before sending it. On receipt of the firing signal from the surface components, the interface 5 will charge the temporary power source 3 and forward the signal to the logic unit 4. The delay within this unit will prevent the fusehead 1 from being fired until the fixed delay elapsed.
  • the underground logic unit 4 may comprise safety devices which disable the detonator safely prior to firing, should anything go wrong.
  • a possible variation in the preferred embodiment hereinabove described is the omission of the transmitter which transmits confirmatory signals to the blast controller 13. This removes some of the versatility from the system, but makes it cheaper and simpler.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Drilling And Exploitation, And Mining Machines And Methods (AREA)
EP19870302126 1986-04-10 1987-03-12 Sprengvorrichtung Expired EP0241151B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87302126T ATE58236T1 (de) 1986-04-10 1987-03-12 Sprengvorrichtung.

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
AUPH540586 1986-04-10
AU5405/86 1986-04-10
AU69653/87A AU585701B2 (en) 1986-04-10 1987-03-03 Blasting method

Publications (2)

Publication Number Publication Date
EP0241151A1 true EP0241151A1 (de) 1987-10-14
EP0241151B1 EP0241151B1 (de) 1990-11-07

Family

ID=25636004

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19870302126 Expired EP0241151B1 (de) 1986-04-10 1987-03-12 Sprengvorrichtung

Country Status (2)

Country Link
EP (1) EP0241151B1 (de)
ES (1) ES2018823B3 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4240132A1 (de) * 1992-11-28 1994-06-01 Goetze Ag Flachdichtung, insbesondere Zylinderkopfdichtung
DE10032139A1 (de) * 2000-05-05 2001-11-08 Dynamit Nobel Ag Verfahren zur Installation eines Zündsystems und Zündsystem

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3102476A (en) * 1961-04-24 1963-09-03 Manley H Naeseth Electric circuit for firing detonators consecutively
US3757697A (en) * 1972-02-02 1973-09-11 Bendix Corp Remotely controlled blasting machine
US4031826A (en) * 1974-10-07 1977-06-28 Motorola, Inc. Detonation system and method
EP0003412A2 (de) * 1978-02-01 1979-08-08 Imperial Chemical Industries Plc Elektrisches Verzögerungsgerät
DE3114234A1 (de) * 1981-04-08 1982-11-04 Wasagchemie Sythen GmbH, 4358 Haltern Zuendeinrichtung
EP0147688A2 (de) * 1983-12-22 1985-07-10 Dynamit Nobel Aktiengesellschaft Verfahren zum zeitlich gestaffelten Auslösen elektronischer Sprengzeitzünder
US4576093A (en) * 1984-04-12 1986-03-18 Snyder Richard N Remote radio blasting

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3102476A (en) * 1961-04-24 1963-09-03 Manley H Naeseth Electric circuit for firing detonators consecutively
US3757697A (en) * 1972-02-02 1973-09-11 Bendix Corp Remotely controlled blasting machine
US4031826A (en) * 1974-10-07 1977-06-28 Motorola, Inc. Detonation system and method
EP0003412A2 (de) * 1978-02-01 1979-08-08 Imperial Chemical Industries Plc Elektrisches Verzögerungsgerät
DE3114234A1 (de) * 1981-04-08 1982-11-04 Wasagchemie Sythen GmbH, 4358 Haltern Zuendeinrichtung
EP0147688A2 (de) * 1983-12-22 1985-07-10 Dynamit Nobel Aktiengesellschaft Verfahren zum zeitlich gestaffelten Auslösen elektronischer Sprengzeitzünder
US4576093A (en) * 1984-04-12 1986-03-18 Snyder Richard N Remote radio blasting

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4240132A1 (de) * 1992-11-28 1994-06-01 Goetze Ag Flachdichtung, insbesondere Zylinderkopfdichtung
DE10032139A1 (de) * 2000-05-05 2001-11-08 Dynamit Nobel Ag Verfahren zur Installation eines Zündsystems und Zündsystem

Also Published As

Publication number Publication date
ES2018823B3 (es) 1991-05-16
EP0241151B1 (de) 1990-11-07

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