US3834310A - Remote control circuit and apparatus for exploding explosives - Google Patents

Remote control circuit and apparatus for exploding explosives Download PDF

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Publication number
US3834310A
US3834310A US00370617A US37061773A US3834310A US 3834310 A US3834310 A US 3834310A US 00370617 A US00370617 A US 00370617A US 37061773 A US37061773 A US 37061773A US 3834310 A US3834310 A US 3834310A
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US
United States
Prior art keywords
circuit
electromagnetic field
control circuit
ignition
remote control
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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.)
Expired - Lifetime
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US00370617A
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English (en)
Inventor
T Ueda
Y Ohsumi
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.)
NOF Corp
Fats Co Ltd Japan
Original Assignee
Nippon Oil and Fats Co Ltd
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Publication date
Application filed by Nippon Oil and Fats Co Ltd filed Critical Nippon Oil and Fats Co Ltd
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Publication of US3834310A publication Critical patent/US3834310A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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

  • ABSTRACT A remote control circuit and apparatus for exploding explosives. Electric power generated at a resonance circuit when it is tuned to a control electromagnetic field is used to charge an ignition condenser. Provision is made for a control circuit including a controlled rectifier called a triac. The control circuit is adapted to generate a starting pulse at an instant when the control electromagnetic field is extinguished. The starting pulse serves to make the controlled rectifier conductive and hence discharge the ignition condenser through a detonator, thereby initiating it and exploding blasting explosives used to break rock and other solid material.
  • All of the apparatuses for exploding explosives which have heretofore been used in general consist of a wired apparatus comprising an ignition circuit and an electric detonator, both being interconnected through electric wires.
  • the remote control apparatus shown in FIG. 1 comprises a control device for radiating supersonic waves and areceiving device consisting of an ignition circuit having an electric detonator 1, a relay 2 and a battery 3 for supplying a current to the electric detonator 1 and a control circuit 4 for receiving the supersonic waves 5 and coupled to the relay 2 of the ignition circuit.
  • the control device arranged distant from the receiving device serves to radiate the supersonic wave-s 5 which upon being received by the control circuit 4 causes it to open or close the relay 2.
  • the relay 2 If the relay 2 is closed, a current flows from the battery 3 through the electric detonator 1 to ignite it and to explode the blasting explosive, thereby completing the blasting operation. Even though provision is made of a safety device for preventing erroneous operation, the presence of the battery 3 could cause an accidental supply of current from the battery 3 to the electric detonator 1, thereby causing an accidental explosion of the explosives. Thus, the apparatus shown in FIG. 1 is not safe in handling and installing thereof. In addition, the above mentioned receiving device including the ignition circuit is complex in construction and hence considerably expensive, and as a result, such receiving device is not suitable as one which is completely exhausted after one shot of the explosive has been effected.
  • the battery used as the power source is always in the ignition circuit during a period of time from its installation to the explosion of the explosive and hence becomes considerably consumed so that it is impossible to reliably explode the explosive in a stable manner, and that the use of a battery results in a limitation in time.
  • FIG. 2 is a schematic circuit diagram- 0f a remote control circuit and apparatus for exploding explosives according to the invention
  • FIG. 3 is a simplified schematic circuit diagram of the remote control circuit shown in FIG. 2;
  • FIGS. 4A to 4D are pulse shape diagrams illustrating a manner by which the remote control circuit and apparatus for exploding explosives according to the invention shown in FIG. 2 may be operated.
  • FIG. 2 and FIG. 3 is shown one embodiment of the invention in which reference numeral 6 designates a loop antenna for radiating an electromagnetic field to a control circuit 8.
  • a control oscillator 7 is connected with the loop antenna 6. From the oscillator 7 an alternating current power having a frequency of several KHz is supplied to the loop antenna 6 which then radiates the strong electromagnetic field.
  • the control circuit. 8 ishermetically sealed in a plastic container and comprises a resonance circuit consistingof' an antenna coil 9 and a condenser 10 connected in: parallel with each other.
  • the resonance circuit comprising, the an tenna coil 9 andcondenser 10 are adapted to be tuned to the electromagnetic field radiated from the loop antenna 6 so as to induce an alternating current voltage in the antenna coil 9.
  • Across the condenser 10 are'connected a diode 11 and a large capacity ignition condenser 1-2 connected in series with each other.
  • An ignition switch circuit Ig and a heating bridge 21 of anelectric detonator 19 are connected in series across the large capacity ignition condenser 12'.
  • Across the condenser 10 is also connected a series circuit including a switch starting circuit St, the ignition switch circuit Ig and the heating bridge 21 of the electric detonator 19.
  • the switch starting circuit St may preferably be composed of a diode 13, a small capacity condenser 14, a field effect transistor 15 and a resistor 18.
  • the ignition switch circuit lg may preferably be composed of a controlled rectifier 16 called a triac.
  • the diodes 11 and I3 are connected in opposite polarity, that is the diode 11 becomes conductive when a positive potential is applied to its anode from the resonance circuit 9, 1 0 and the diode 13 becomes conductive when a negative potential is applied to its cathode from the resonance circuit 9, 10.
  • the small capacity condenser 14 and the resistor 18 of the switch start circuit St are connected in parallel and this parallel circuit is connected between the common connection point between the anode of the diode 13 and the gate electrode of the field effect transistor 15 on the one hand, and the cathode of the controlled rectifier 16 on the other hand.
  • the gate electrode 17 of the controlled rectifier 16 is connected with the drain of the field effect transistor 15.
  • the source electrode of the field effect transistor 15 is connected to a common connection point between the cathode of the diode 11 and the anode-of the controlled rectifier l6.
  • the alternating current power having a frequency of several KI-Iz is supplied from the oscillator 7 to the loop antenna 6 which generates a strong electromagnetic field.
  • the resonance circuit consisting of the antenna coil 9 and the condenser 10 is tuned to the frequency of the electromagnetic field to induce an alternating current voltage shown in FIG. 4A in the antenna coil 9.
  • This alternating current voltage is supplied through the diode 1 l to the large capacity ignition condenser 12 so as to positively charge it as shown in FIG. 48.
  • the alternating current voltage generated at the antenna coil 9 and of which the pulse shape is shown in FIG. 4A is supplied through the diode 13 to the small capacity condenser 14 so as to negatively charge it in a rapid manner.
  • the gate of the field effect transistor 15 is kept at a negative potential, and as a result, no current flows through the field effect transistor 15.
  • the potential of the gate 17 of the controlled rectifier 16 becomes zero so that no current flows through the controlled rectifier 16.
  • the use of the measures describe ensures explosion in a safe manner and provides a number of advantages.
  • very weak electric power is used for a sufficiently long time to charge the large capacity ignition condenser 12 contrary to the case in which the detonator is directly ignited with the aid of radio waves.
  • the control circuit is not required to incorporate batteries therein and by making the oscillator 7 inoperative it may be ensured that the detonator 19 can instantaneously be ignited in a stable and safe manner.
  • a number of control circuits arranged in the electromagnetic field emitted from the sending antenna 6 may simultaneously be ignited to explode a corresponding number of explosives at the same time and hence the invention provides significant utility in the explosive blasting industry.
  • the invention makes use of the electromagnetic field whose frequency is several KHz which is not used in common radio communications and electric supply sources. As a result, at places where the remote control circuit and apparatus according to the invention are arranged, there is no strong electric fields which are sufficient to operate the control circuit thereof. In addition, the electromagnetic field is received by the tuned antenna coil so that there is no risk of the ingition circuit being erroneously operated by the presence of electromagnetic waves whose frequencies are different from several KHz.
  • the control circuit of the remote control circuit and apparatus according to the invention may be embedded in the ground and may be remotely controlled from the loop antenna 6 of the control device arranged distant therefrom.
  • a remote control circuit for exploding explosives comprising a control circuit comprising a. a circuit including a resonance circuit adapted to be tuned to a control electromagnetic field and an ignition condenser adapted to be charged by an electric power generated at said resonance circuit when tuned to said control electromagnetic field, and
  • a remote control apparatus for exploding explosives comprising a control circuit comprising a. a circuit including a resonance circuit adapted to be tuned to a control electromagnetic field and an ignition condenser adapted to be charged by electric power generated at said resonance circuit when tuned to said control electromagnetic field, and
  • an ignition circuit including a controlled rectifier for generating a starting pulse at an instant when said control electromagnetic field is extinguished and discharging the electric power of said ignition condenser through a detonator, and
  • a control device including an oscillator and a loop antenna and adapted to remotely control said circuit for exploding explosives.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Selective Calling Equipment (AREA)
  • Generation Of Surge Voltage And Current (AREA)
  • Air Bags (AREA)
US00370617A 1972-06-23 1973-06-18 Remote control circuit and apparatus for exploding explosives Expired - Lifetime US3834310A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP47062981A JPS5028621B2 (enrdf_load_stackoverflow) 1972-06-23 1972-06-23

Publications (1)

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US3834310A true US3834310A (en) 1974-09-10

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Application Number Title Priority Date Filing Date
US00370617A Expired - Lifetime US3834310A (en) 1972-06-23 1973-06-18 Remote control circuit and apparatus for exploding explosives

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US (1) US3834310A (enrdf_load_stackoverflow)
JP (1) JPS5028621B2 (enrdf_load_stackoverflow)
DE (1) DE2331968C3 (enrdf_load_stackoverflow)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4145970A (en) * 1976-03-30 1979-03-27 Tri Electronics Ab Electric detonator cap
US4311096A (en) * 1980-05-05 1982-01-19 Atlas Powder Company Electronic blasting cap
US4445435A (en) * 1980-05-05 1984-05-01 Atlas Powder Company Electronic delay blasting circuit
DE3442390A1 (de) * 1983-11-22 1985-06-13 Nippon Oil And Fats Co., Ltd., Tokio/Tokyo Ferngesteuerte zuendung zum aufeinanderfolgenden zuenden mehrerer zuender
US4576093A (en) * 1984-04-12 1986-03-18 Snyder Richard N Remote radio blasting
GB2164730A (en) * 1984-09-04 1986-03-26 Ici Plc Remotely controlled firing of ignition elements
US4825765A (en) * 1986-09-25 1989-05-02 Nippon Oil And Fats Co., Ltd. Delay circuit for electric blasting, detonating primer having delay circuit and system for electrically blasting detonating primers
US4960183A (en) * 1985-08-16 1990-10-02 Exxon Production Research Company Seismic source firing control system
US5038682A (en) * 1988-07-26 1991-08-13 Plessey South Africa Limited Electronic device
US5159149A (en) * 1988-07-26 1992-10-27 Plessey South Africa Limited Electronic device
US6260483B1 (en) * 1998-04-24 2001-07-17 Richard N. Snyder Remote radio controlled plasma firing system
AU2013390825B2 (en) * 2013-05-31 2017-03-30 Halliburton Energy Services, Inc. Method and apparatus for generating seismic pulses to map subterranean fractures
US12313391B2 (en) 2015-09-16 2025-05-27 Orica International Pte Ltd Wireless initiation device

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5741600A (en) * 1980-08-26 1982-03-08 Nippon Oils & Fats Co Ltd Method of and apparatus for triggering percussion cap by microwave
AUPP021697A0 (en) * 1997-11-06 1997-11-27 Rocktek Limited Radio detonation system
JP5746517B2 (ja) 2011-02-23 2015-07-08 住友電気工業株式会社 電力線通信システム

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1757288A (en) * 1926-09-07 1930-05-06 Warren F Bleecker System for shooting wells by radio
US3170399A (en) * 1951-05-18 1965-02-23 Jr Wilbur S Hinman Radio remote control mine circuit with no current drain
US3780654A (en) * 1971-10-15 1973-12-25 Oki Electric Ind Co Ltd Remote detonation system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1757288A (en) * 1926-09-07 1930-05-06 Warren F Bleecker System for shooting wells by radio
US3170399A (en) * 1951-05-18 1965-02-23 Jr Wilbur S Hinman Radio remote control mine circuit with no current drain
US3780654A (en) * 1971-10-15 1973-12-25 Oki Electric Ind Co Ltd Remote detonation system

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4145970A (en) * 1976-03-30 1979-03-27 Tri Electronics Ab Electric detonator cap
US4311096A (en) * 1980-05-05 1982-01-19 Atlas Powder Company Electronic blasting cap
US4445435A (en) * 1980-05-05 1984-05-01 Atlas Powder Company Electronic delay blasting circuit
US4615268A (en) * 1983-11-22 1986-10-07 Nippon Oil And Fats Company Limited Remote blasting system for effecting multiple-step explosion and switching unit for use in this system
DE3442390A1 (de) * 1983-11-22 1985-06-13 Nippon Oil And Fats Co., Ltd., Tokio/Tokyo Ferngesteuerte zuendung zum aufeinanderfolgenden zuenden mehrerer zuender
US4576093A (en) * 1984-04-12 1986-03-18 Snyder Richard N Remote radio blasting
AU568226B2 (en) * 1984-09-04 1987-12-17 Imperial Chemical Industries Plc Remotely controlled firing of ignition elements
US4685396A (en) * 1984-09-04 1987-08-11 Imperial Chemical Industries Plc Method and apparatus for safer remotely controlled firing of ignition elements
GB2164730A (en) * 1984-09-04 1986-03-26 Ici Plc Remotely controlled firing of ignition elements
US4960183A (en) * 1985-08-16 1990-10-02 Exxon Production Research Company Seismic source firing control system
US4825765A (en) * 1986-09-25 1989-05-02 Nippon Oil And Fats Co., Ltd. Delay circuit for electric blasting, detonating primer having delay circuit and system for electrically blasting detonating primers
US5038682A (en) * 1988-07-26 1991-08-13 Plessey South Africa Limited Electronic device
US5159149A (en) * 1988-07-26 1992-10-27 Plessey South Africa Limited Electronic device
US6260483B1 (en) * 1998-04-24 2001-07-17 Richard N. Snyder Remote radio controlled plasma firing system
AU2013390825B2 (en) * 2013-05-31 2017-03-30 Halliburton Energy Services, Inc. Method and apparatus for generating seismic pulses to map subterranean fractures
US12313391B2 (en) 2015-09-16 2025-05-27 Orica International Pte Ltd Wireless initiation device

Also Published As

Publication number Publication date
DE2331968C3 (de) 1981-01-29
JPS4921627A (enrdf_load_stackoverflow) 1974-02-26
DE2331968B2 (de) 1979-03-29
JPS5028621B2 (enrdf_load_stackoverflow) 1975-09-17
DE2331968A1 (de) 1974-01-17

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