EP0250737A1 - Fusée à retardement pour sautage - Google Patents

Fusée à retardement pour sautage Download PDF

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Publication number
EP0250737A1
EP0250737A1 EP87105426A EP87105426A EP0250737A1 EP 0250737 A1 EP0250737 A1 EP 0250737A1 EP 87105426 A EP87105426 A EP 87105426A EP 87105426 A EP87105426 A EP 87105426A EP 0250737 A1 EP0250737 A1 EP 0250737A1
Authority
EP
European Patent Office
Prior art keywords
hose
delay device
check valve
detonator
delay
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
EP87105426A
Other languages
German (de)
English (en)
Other versions
EP0250737B1 (fr
Inventor
Hans Dr. Florin
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.)
Dynamit Nobel AG
Original Assignee
Dynamit Nobel AG
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6299614&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0250737(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Priority to IN72/MAS/87A priority Critical patent/IN169203B/en
Application filed by Dynamit Nobel AG filed Critical Dynamit Nobel AG
Priority to AT87105426T priority patent/ATE53655T1/de
Publication of EP0250737A1 publication Critical patent/EP0250737A1/fr
Application granted granted Critical
Publication of EP0250737B1 publication Critical patent/EP0250737B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42C—AMMUNITION FUZES; ARMING OR SAFETY MEANS THEREFOR
    • F42C15/00—Arming-means in fuzes; Safety means for preventing premature detonation of fuzes or charges
    • F42C15/34—Arming-means in fuzes; Safety means for preventing premature detonation of fuzes or charges wherein the safety or arming action is effected by a blocking-member in the pyrotechnic or explosive train between primer and main charge
    • 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
    • F42B3/16—Pyrotechnic delay initiators

Definitions

  • the invention relates to a detonator according to the preamble of patent claim 1.
  • Detonators are used to detonate various charges in a specific order when blasting rocks or mining. Each detonator contains a delay device that delays the ignition of the charge by a precisely defined delay time. Electrical detonators are initiated by electrically igniting a squib. An electrical detonator detonator forms a "closed system" in which all pyrotechnic components are surrounded by a metallic sleeve.
  • non-electrical detonators which are connected to an ignition transmission hose. Threads made of a reactive material run in the tube. Will these threads be on one Ignited hose end, then a self-sustaining pilot flame is created in the hose, combined with a shock wave, whereby flame-sensitive substances can be ignited at the other end of the hose.
  • the hose transmits the ignition flame to the detonator and first causes a pyrotechnic delay set to burn, which determines the individual delay time of the detonator. Since the hose extends into the sleeve of the detonator, the detonator forms an "open system".
  • Such an open system has the disadvantage that the pressure building up in the sleeve can discharge indefinitely through the hose, so that the desired defined delay time cannot be achieved. Detonators according to the open system therefore have a wide range of delays.
  • the invention has for its object to provide a non-electrical detonator according to the preamble of claim 1, which causes a defined ignition delay with a small spread and is equivalent to the electrical detonator.
  • a check valve is arranged between the inside of the hose and the delay device, which only opens when the pressure in the hose is greater than the pressure in the sleeve. If the pilot flame has entered the sleeve, so that the ignition has continued into the sleeve, then an overpressure arises due to gas formation in the sleeve, which causes the check valve to close. From this point on, the detonator works with a "closed system", ie there is a defined pressure build-up and a defined propagation of the ignition through the delay device, without pressure being able to escape into the hose.
  • the advantage of the non-electrical detonator according to the invention lies in the fact that very small spreads in the delay times are achieved.
  • the uniformity achieved with this, with which the detonator detonators of each time step ignite, is of crucial importance for a good detonation result.
  • the delay set burns in a closed room, whereby no pressure and gas relief can take place via the hollow open hose. As a result, a defined delay time is strictly observed.
  • the invention is based on the idea that the part of the detonator igniter containing the delay device is closed off by the check valve with respect to the cavity of the hose as soon as the pilot flame has been transmitted.
  • the check valve opens only in the short time of the ignition phase (a few milliseconds) and then closes again, so that the delay device burns off under the defined and constant conditions of a closed volume.
  • the detonator shown in FIGS. 1 and 2 has a cylindrical sleeve 10 closed at the lower end, into the other end of which the hose 11 leads.
  • the hose 11 is an ignition transmission hose (e.g. "signal tube” manufactured by ATLAS Powder Company).
  • the end part of the hose 10 is surrounded in the interior of the sleeve 10 by a plug 12 which is attached to the sleeve by crimping and causes a seal between the hose and the sleeve.
  • the lower part of the sleeve 10 contains the underload 13 (secondary explosive).
  • the delay device 14 is located above the undercharge.
  • This has a tube 15 which contains in its upper part the delay set 16 which determines the delay time and in its lower part an initial charge 7 (initial explosive) for igniting the underload 13.
  • the sealing plug 12 which is made of elastomer material, encloses the end of the hose 11 in the interior of the sleeve 10.
  • the front end of the sealing plug 12 forms a check valve 18 in the form of the slotted valve shown in detail in FIG.
  • the end wall of the sealing plug 12 is hemispherical, that is to say it is curved toward the inside of the sleeve.
  • the channel 19 for receiving the hose 11 ends according to FIG. 2a on the front bottom wall 20.
  • a slot 21 extends axially from the bottom wall 20 through the front wall of the sealing plug 12.
  • FIG. 2b shows an end view of the sealing plug with the slot 21 closed.
  • the slot 21 Due to the elasticity of the sealing plug, the slot 21 is closed held as long as there is no excess pressure inside the sealing plug or the hose 11. In the event of overpressure in the sealing plug 12, the slot edges are spread apart as shown in FIG. 2c, so that the slot 21 opens.
  • the detonator according to Figures 1 and 2 has the following function:
  • the reaction which continues in the hose 11 causes an increase in gas pressure, by means of which the check valve 18 is opened, so that the pilot flame from the hose 11 hits the ignition surface of the delay set 16 through the opened slot 21 and the empty space 22. This ignites the ignition charge 16. After a predetermined delay time, the length of which is determined by the delay device 14, the undercharging 13 is detonated.
  • the tube 11 Since the tube 11 is open to the outside through its cavity, the pressure increase caused by the reaction in the tube is short-lived.
  • the overpressure in the hose drops back to normal pressure after about 5 ms, so that the slot 21 closes again after this time.
  • a gas overpressure remains in the intermediate space 22. Due to the hemispherical shape of the front end of the sealing plug 12 and the excess pressure in the intermediate space 22, the check valve 18 closes, so that the delay set 16 burns in a closed space.
  • FIG. 3 shows another embodiment of the sealing plug 12 which forms the check valve 18
  • the end wall of the sealing plug here consists of a frustoconical region 23 adjoining the side wall and an adjoining cylindrical region 24.
  • the slot 21 runs through the regions 23 and 24. Again, slot 21 is normally kept closed due to the elasticity of the plug material; the slot 21 opens according to FIG. 3c only if there is excess pressure inside the sealing plug 12.
  • FIG. 4 corresponds to that of FIGS. 1 and 2, with the exception of the fact that a pyrotechnic reactive substance 25 is arranged in a loose filling in the space 22 between the front end of the sealing plug 12 and the delay device 14.
  • This substance 25 has the task of transferring the ignition from the open slot of the check valve 18 to the delay set 16.
  • a mixture which generates a lot of heat but little gas is preferably considered as the pyrotechnic substance, so that the heat produced melts the surface of the check valve 18 and the valve slot is sealed even better by fusing.
  • the check valve 18 has an essentially rigid valve body 26 which projects with a tubular region 27 into the end of the hose 12 and is supported with its end wall 28 on the end of the hose 11 which is open at the end.
  • the plug 12 ends flush with the hose 11 inside the sleeve 10.
  • radial outflow openings 29 are provided in the vicinity of the end wall 28.
  • the holes 29 are located in the interior of the hose 11, through which they are closed.
  • the valve body 26 moves axially into the intermediate space 22, the rear end still being guided within the hose 11, while the end wall 28 abuts against the transfer charge 30 resting on the delay device 14 (FIG. 6).
  • the transfer charge 30 is ignited with the check valve open through the openings 29 from the inside of the hose 11.
  • the transfer charge 30 is designed such that on the one hand it ignites the delay set 16 and on the other hand suddenly generates so much gas that the check valve 18 is thereby closed again by pushing back the valve body 26 into the hose 11.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Bags (AREA)
  • Check Valves (AREA)
  • Surgical Instruments (AREA)
  • Compositions Of Oxide Ceramics (AREA)
  • Fishing Rods (AREA)
EP87105426A 1986-04-26 1987-04-11 Fusée à retardement pour sautage Expired - Lifetime EP0250737B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
IN72/MAS/87A IN169203B (fr) 1986-04-26 1987-02-04
AT87105426T ATE53655T1 (de) 1986-04-26 1987-04-11 Sprengzeitzuender.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3614204 1986-04-26
DE19863614204 DE3614204A1 (de) 1986-04-26 1986-04-26 Sprengzeitzuender

Publications (2)

Publication Number Publication Date
EP0250737A1 true EP0250737A1 (fr) 1988-01-07
EP0250737B1 EP0250737B1 (fr) 1990-06-13

Family

ID=6299614

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87105426A Expired - Lifetime EP0250737B1 (fr) 1986-04-26 1987-04-11 Fusée à retardement pour sautage

Country Status (9)

Country Link
US (1) US4809610A (fr)
EP (1) EP0250737B1 (fr)
JP (1) JPS62258999A (fr)
BR (1) BR8701963A (fr)
CA (1) CA1282639C (fr)
DE (2) DE3614204A1 (fr)
ES (1) ES2015912B3 (fr)
GR (1) GR3000767T3 (fr)
ZA (1) ZA872932B (fr)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4957027A (en) * 1989-10-02 1990-09-18 The United States Of America As Represented By The Secretary Of The Navy Versatile nonelectric dearmer
US5036588A (en) * 1989-10-02 1991-08-06 The United States Of America As Represented By The Secretary Of The Navy Nonvolatile, fast response wire cutter
NO905331L (no) * 1990-01-30 1991-07-31 Ireco Inc Forsinkelsesdetonator.
US5031538A (en) * 1990-02-07 1991-07-16 The Ensign-Bickford Company Delay train ignition buffer
US5086702A (en) * 1990-04-12 1992-02-11 Atlas Powder Company Modular blasting system
AT396302B (de) * 1991-06-13 1993-08-25 Schaffler & Co Nichtelektrischer sprengzuender
US5594196A (en) * 1995-04-20 1997-01-14 Ireco, Inc. Shock tube surface connector
US5927312A (en) * 1998-02-27 1999-07-27 Dryden; Paul E. Method and apparatus for extinguishing combustion within combustible tubing
FR2797947B1 (fr) * 1999-08-24 2001-11-16 Francesco Ambrico Dispositif pyrotechnique de connexion et de retard
SE516812C2 (sv) * 1999-09-06 2002-03-05 Dyno Nobel Sweden Ab Sprängkapsel, förfarande för tändning av basladdning samt initieringselement för sprängkapsel
JP4791645B2 (ja) * 2001-04-05 2011-10-12 カヤク・ジャパン株式会社 雷管用延時装置

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1516031A (en) * 1977-02-02 1978-06-28 Ici Ltd Delay ignition transmission assembly

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA749682A (en) * 1967-01-03 Prior Josef Detonation interrupter with valve action
US704465A (en) * 1901-10-22 1902-07-08 Wassily Kirsanov Blasting-cartridge.
FR563121A (fr) * 1922-05-02 1923-11-27 Air Liquide Dispositif pour fixer aux cartouches l'organe de transmission de l'allumage
US3368485A (en) * 1966-04-08 1968-02-13 Robert L. Klotz Nonexplosive detonating fuse directional interrupter
DE2452080C3 (de) * 1974-11-02 1979-12-06 Pyrotechnische Fabriken Hans Moog-H. Nicolaus, 5630 Remscheid-Luettringhausen Feuerwerkskörper
DE3123250A1 (de) * 1981-06-11 1983-01-05 Friedrich Wilhelm Dipl.-Kfm. 4600 Dortmund Sobbe Sprengschnurverschluss
US4664033A (en) * 1985-03-22 1987-05-12 Explosive Technology, Inc. Pyrotechnic/explosive initiator

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1516031A (en) * 1977-02-02 1978-06-28 Ici Ltd Delay ignition transmission assembly

Also Published As

Publication number Publication date
ES2015912B3 (es) 1990-09-16
BR8701963A (pt) 1988-02-02
ZA872932B (en) 1987-10-19
EP0250737B1 (fr) 1990-06-13
DE3763249D1 (de) 1990-07-19
DE3614204A1 (de) 1987-10-29
GR3000767T3 (en) 1991-10-10
CA1282639C (fr) 1991-04-09
JPS62258999A (ja) 1987-11-11
US4809610A (en) 1989-03-07

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