WO1996016310A1 - Circuit de temporisation pour detonateur - Google Patents

Circuit de temporisation pour detonateur Download PDF

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Publication number
WO1996016310A1
WO1996016310A1 PCT/GB1995/002665 GB9502665W WO9616310A1 WO 1996016310 A1 WO1996016310 A1 WO 1996016310A1 GB 9502665 W GB9502665 W GB 9502665W WO 9616310 A1 WO9616310 A1 WO 9616310A1
Authority
WO
WIPO (PCT)
Prior art keywords
oscillator
detonator
pulse
length
switches
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/GB1995/002665
Other languages
English (en)
Inventor
Peter Christian Shann
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.)
Explosive Developments Ltd
Original Assignee
Explosive Developments 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 Explosive Developments Ltd filed Critical Explosive Developments Ltd
Priority to AU38527/95A priority Critical patent/AU3852795A/en
Publication of WO1996016310A1 publication Critical patent/WO1996016310A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • F42D1/055—Electric circuits for blasting specially adapted for firing multiple charges with a time delay

Definitions

  • This invention relates to detonating arrangements and, more specifically, to detonating arrangements in which an electrical detonator is activated to detonate, thereby to induce a detonation wave into a bulk explosives, after a predetermined time delay following receipt of a firing signal.
  • the "clock" for determining the different timings for the detonations conveniently comprises an oscillator in each detonator circuit but, unfortunately, the oscillators used to date have inherent inaccuracies and precise desired delays in the detonation of the detonators following a common fire signal have been difficult to obtain.
  • One method for overcoming this problem, and now well published, is to cause the oscillator to operate and to count the number of pulses made by the oscillator over an accurately measured time interval and to use the number of pulses counted over said interval to calculate the number of pulses to be made by the oscillator to achieve a desired timing for the delay for the detonator.
  • the present invention seeks to provide an explosive detonator arrangement capable of producing relatively accurate delay periods.
  • a method for setting a delay time for an explosive detonator in a detonator circuit comprising the steps of adjusting an oscillator for the detonator circuit to produce pulses of a predetermined length and subsequently sending a signal to a counter for the oscillator to count a predetermined number of pulses of said predetermined length before activating the detonator associated with the oscillator.
  • the method is characterised by the steps of selecting the oscillator to comprise a so-called "ring" oscillator, whereby the length of a pulse of the oscillator is determined by a plurality of switches operating successively, and calibrating the oscillator by selecting the number of switches to be operated successively to achieve the predetermined pulse length for the oscillator.
  • the method includes the steps of forming the oscillator, and the • ⁇ ring" of switches therefore, on an electronic chip.
  • the method includes the steps of setting the predetermined pulse length for the oscillator whilst its oscillator is in the detonator circuit.
  • the method is characterised by the steps of selecting the oscillator to produce square wave pulses.
  • the method is characterised by the steps of selecting the oscillator to produce saw-tooth pulses, with the leading edge of each pulse substantially vertical.
  • the method is characterised by the steps of selecting the oscillator to produce saw-tooth pulses, with the trailing edge of each pulse substantially vertical.
  • the invention also envisages apparatus for setting a delay for firing a detonator after receipt of a firing signal.
  • said apparatus including a circuit for the detonator, an oscillator in the circuit for the detonator, and means for adjusting the oscillator to produce pulses of a predetermined pulse length.
  • the apparatus is characterised in that the oscillator comprises a so-called "ring" oscillator, and where the length of each predetermined oscillator pulse is determined by the successive operation of a plurality of switches.
  • Fig 1 shows, diagrammatically, an oscillator with a sinusoidal pulse pattern.
  • Fig 2 shows, diagrammatically, a switch ring for controlling the pulse length of the oscillator illustrated in Fig 1 and
  • Fig 3 shows, diagrammatically, a detonator circuit in accordance with the invention.
  • the oscillator 11 illustrated in Fig 1 is activated by power on line 12.
  • the oscillator 11 includes a pulse counter 13, the counter 13 is arranged to count the number of pulses made by the oscillator 11 and, on a predetermined number of pulses being counted, the pulse counter 13 transmits a signal on the line 1 .
  • Fig 2 shows a switch ring for the oscillator 11 in accordance with the invention.
  • the "ring" 15 of switches 161 to 16n illustrated in Fig 2 would normally have all its switches 161 and 16n open and, on receipt of a signal on line 17, the switches 161 to 16n close successively, as each switch 16 closes it extends the signal from line 17 to cause the next switch 16 to close until all the switches 161 to 16n are closed and the signal received on line 17 is transmitted via wire 18.
  • the oscillator 11 may be calibrated by attaching the ring 15 of switches 161 to 16n to a timing arrangement, settable to accurately determine the number of switches 161 to 16Q to be closed in order to give a predetermined pulse length L to the oscillator 11 and, when the timing arrangement is actuated, the switches 16 of the ring 15 are allowed to close in succession until, after the predetermined time, the last to close switch 16 * g is noted. Thereafter all the switches after the last to close switch 16x. are disconnected from the ring circuit so that the signal from switch 16 ⁇ is applied direct to wire 18 and the length L of the pulse of the oscillator 11 is thereby set.
  • the ring 15 of switches 161 to 16 ⁇ is arranged to operate for each pulse made by the oscillator 11, so that all the pulses generated by the oscillator 11 have the same effective time length.
  • the pulse length oscillator 11 can be accurately calibrated.
  • a switch in a line extending from the last to operate switch 16x. determining a desired pulse length L, is closed and arranged to extend the signal from the last operated switch 16x. to the line 18, thus to by-pass the switches 16 between the last operated switch 16x and the line 18 in the direction of switch closure.
  • Other arrangements for terminating the closure of the switches 16 after the number of switches 16 ⁇ have closed to predetermine the length of the pulse L will be apparent to persons skilled in the art.
  • a control unit C transmits signals via lines 19 and 20 and a plurality of detonator circuits Dl, D2 — DN are connected to the lines 19 20.
  • Each of the detonator circuits Dl D2 — DN includes an oscillator 11, with its associated pulse counter 13, a condensor 21 and a detonator 22.
  • the condensers 21 are all fully charged by applying power to the lines 19 20 before the oscillators 11 are activated and the arrangement is such that, when the pulse counter 13 of each detonator circuit Dl D2 — DN has counted the required number of pulses for that circuit, the condensor 21 is discharged to activate the detonator 22.
  • each detonator circuit will include a ring 15 of switches 161 to 16Q and the oscillator may be calibrated whilst in the detonator circuit.
  • an oscillator can have its pulse length accurately calibrated in one location any number of variants acting on the oscillator, for example the atmospheric temperature, can adversely affect the oscillator and accordingly the setting of the pulse length.
  • inclusion of the oscillator in the detonator circuit with subsequent calibration of the oscillator pulse length ensures accuracy of the required time delay period.
  • the oscillator is defined as producing a pulse of the form following a point moving with simple harmonic motion it will be appreciated that other forms of pulse may be obtained.
  • the oscillator may produce saw-tooth pulse forms, with the start to each pulse being substantially vertical or the end of each pulse being substantially vertical and all such pulses must be within the scope of the present invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Pulse Circuits (AREA)

Abstract

Cette invention concerne un procédé et un appareil permettant d'étalonner avec précision un oscillateur intégré dans un circuit électrique de mise à feu de détonateur au moyen d'étapes de positionnement de l'oscillateur afin qu'il produise des impulsions d'une longueur prédéterminée. Dans une forme d'exécution présentée l'oscillateur est constitué d'un oscillateur annulaire dans lequel la longueur d'une impulsion est déterminée par une pluralité de commutateurs qui fonctionnent les uns après les autres, le procédé de cette invention permettant d'ajuster le nombre de commutateurs devant fonctionner successivement de manière à obtenir la longueur d'impulsion désirée pour l'oscillateur.
PCT/GB1995/002665 1994-11-18 1995-11-14 Circuit de temporisation pour detonateur Ceased WO1996016310A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU38527/95A AU3852795A (en) 1994-11-18 1995-11-14 Detonator delay circuit

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9423312A GB9423312D0 (en) 1994-11-18 1994-11-18 Detonating arrangements
GB9423312.9 1994-11-18

Publications (1)

Publication Number Publication Date
WO1996016310A1 true WO1996016310A1 (fr) 1996-05-30

Family

ID=10764620

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1995/002665 Ceased WO1996016310A1 (fr) 1994-11-18 1995-11-14 Circuit de temporisation pour detonateur

Country Status (4)

Country Link
AU (1) AU3852795A (fr)
GB (1) GB9423312D0 (fr)
WO (1) WO1996016310A1 (fr)
ZA (1) ZA959797B (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009143585A1 (fr) * 2008-05-29 2009-12-03 Orica Explosives Technology Pty Ltd Étalonnage de détonateurs
CN102142654A (zh) * 2011-01-13 2011-08-03 清华大学 一种单/双频输出激光头及激光输出方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4517532A (en) * 1983-07-01 1985-05-14 Motorola, Inc. Programmable ring oscillator
US4714977A (en) * 1985-02-19 1987-12-22 Square D Company Electronic delay timer
EP0440389A2 (fr) * 1990-02-02 1991-08-07 Seagate Technology International Oscillateur en anneau accordé et circuit de génération d'horloge associé
EP0443221A1 (fr) * 1990-02-14 1991-08-28 Atlas Powder Company Méthode et dispositif pour calibrer un circuit de temporisation
EP0616190A1 (fr) * 1993-03-12 1994-09-21 Asahi Kasei Kogyo Kabushiki Kaisha Circuit électronique de délai pour l'allumage d'une amorce pyrotechnique

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4517532A (en) * 1983-07-01 1985-05-14 Motorola, Inc. Programmable ring oscillator
US4714977A (en) * 1985-02-19 1987-12-22 Square D Company Electronic delay timer
EP0440389A2 (fr) * 1990-02-02 1991-08-07 Seagate Technology International Oscillateur en anneau accordé et circuit de génération d'horloge associé
EP0443221A1 (fr) * 1990-02-14 1991-08-28 Atlas Powder Company Méthode et dispositif pour calibrer un circuit de temporisation
EP0616190A1 (fr) * 1993-03-12 1994-09-21 Asahi Kasei Kogyo Kabushiki Kaisha Circuit électronique de délai pour l'allumage d'une amorce pyrotechnique

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009143585A1 (fr) * 2008-05-29 2009-12-03 Orica Explosives Technology Pty Ltd Étalonnage de détonateurs
AU2009253752B2 (en) * 2008-05-29 2013-09-19 Orica Australia Pty Ltd Calibration of detonators
US8861172B2 (en) 2008-05-29 2014-10-14 Orica Explosives Technology Pty Ltd. Calibration of detonators
CN102142654A (zh) * 2011-01-13 2011-08-03 清华大学 一种单/双频输出激光头及激光输出方法
CN102142654B (zh) * 2011-01-13 2013-04-03 清华大学 一种单/双频输出激光头及激光输出方法

Also Published As

Publication number Publication date
ZA959797B (en) 1996-05-29
GB9423312D0 (en) 1995-01-11
AU3852795A (en) 1996-06-17

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