US20130206027A1 - Rock cracker cartridge and ignition capsule - Google Patents

Rock cracker cartridge and ignition capsule Download PDF

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Publication number
US20130206027A1
US20130206027A1 US13/521,702 US201113521702A US2013206027A1 US 20130206027 A1 US20130206027 A1 US 20130206027A1 US 201113521702 A US201113521702 A US 201113521702A US 2013206027 A1 US2013206027 A1 US 2013206027A1
Authority
US
United States
Prior art keywords
ignition
sleeve
powder charge
unit sleeve
ignition unit
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.)
Abandoned
Application number
US13/521,702
Other languages
English (en)
Inventor
Jan-Åke Bengtsson
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of US20130206027A1 publication Critical patent/US20130206027A1/en
Abandoned legal-status Critical Current

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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
    • 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
    • F42B3/02—Blasting cartridges, i.e. case and explosive adapted to be united into assemblies
    • 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
    • F42B3/11—Initiators therefor characterised by the material used, e.g. for initiator case or electric leads
    • 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
    • F42B3/26—Arrangements for mounting initiators; Accessories therefor, e.g. tools
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42D—BLASTING
    • F42D3/00—Particular applications of blasting techniques
    • F42D3/04—Particular applications of blasting techniques for rock blasting

Definitions

  • FIG. 2 shows an end view of the ignition unit sleeve according to FIG. 1 ,
  • FIG. 4 shows the ignition unit sleeve in a transversal cross-section along the line IV-IV in FIG. 2 ,
  • FIG. 6 shows an insert of mainly known design
  • FIG. 7 shows the insert according to FIG. 6 in a longitidunal, axial cross-section
  • FIG. 8 shows the rock cracker cartridge of the invention before priming as viewed obliquely from above
  • FIG. 9 shows the rock cracker cartridge of the invention primed in a bore in a piece of rock that shall be cracked
  • the unprimed cracker cartridge 1 comprises a first, outer plastic sleeve 2 and an insert unit 25 , FIG. 6 and FIG. 7 , which in turn consists of a plug 4 and a second, inner sleeve 7 .
  • the plug 4 and the inner sleeve 7 consist, according to the embodiment, of a hard plastic material, more specifically an acetal plastic material, and still more specifially of an acetal (POM)-copolymer and are mould jointly to form an integrated unit.
  • the outer sleeve 2 is, according to the embodiment, made of a so called ABS-plastic, which also is a hard plastic material, and has the shape of an elongated circular-cylindrical tube with a flat end wall.
  • the interior of the outer sleeve 2 forms a main chamber 5 which is filled with a cracking powder charge 6 , preferably a nitro powder charge (NC-powder), FIG. 9 .
  • the outer surface as well as the main portion of the inner surface are quite smooth, which nevertheless affords the ignition assembly sleeve 7 a an adequate stiffness but at the same time not a greater rupture resistance than what it maximally may have in order certainly to be broken up when that ignition capsule which shall be described in the following, is ignited, and which in the primed cracking cartridge 1 is accommodated in the space 9 of the ignition assembly sleeve 7 a which is denominated priming chamber.
  • the pointed nose portion or tip 12 is conical, forming an acute angle. Close to the nose portion 12 , the sleeve 7 a has an internal constriction 26 , which is about 0.2 mm thick in the radial direction and about 5 mm long in the axial direction.
  • the plug 4 is pressed with some force into the mouth section of the outer sleeve 2 so far that the flange 22 abuts the upper edge of the outer sleeve 2 and the flat end wall 20 will be pressed against the cracking powder charge 6 .
  • the inner sleeve, 7 , 7 a will be pressed into the cracking powder charge 6 , which is facilitated by its pointed edge portion or tip 12 .
  • the ignition capsule 30 consists of an ignition unit sleeve 31 , FIG. 1-FIG . 4 , and, in said sleeve 31 an ignition unit 32 consisting of an igniter 33 a which can be activated electrically, an ignition powder charge 29 consisting of the same type of NC-powder as the cracking powder charge 6 , and an igniter socket 34 , to which ignition cables 37 are connected.
  • the igniter is of the type which has its normal use in the pyrotechnical field for firing pyrotechnical articles. Igniters of that type are manufactured e.g. by the Czech company META-PYRO, s.r.o., Brno.
  • the depth of the grooves 35 exceeds half the wall thickness of the ignition unit sleeve 31 , more specifically, the depth is 0.7 mm.
  • the mean width of the grooves which widen in the outwards direction, approximately equals the wall thickness of the ignition unit sleeve.
  • the outer diameter of the ignition unit sleeve 31 is slightly—about 0.2 mm—smaller than the inner diameter of the ignition assembly sleeve 7 a. Its cylindrical length equals the cylindrical length of the ignition assembly sleeve 7 a, i.e. it extends all the way to the conical nose portion 12 of the ignition assembly sleeve 7 a.
  • the ignition capsule 30 can be entered into the ignition assembly sleeve 7 a with close fit against the inside surface of the ignition assembly sleeve but without jamming.
  • the gap 39 between the two sleeves 31 and 7 a amounts to about 0.1 mm according to the embodiment but it may also be slightly smaller or larger. Preferably, however, the width of the gap should be within the range 0.05-0.2 mm.
  • the ignition assembly sleeve 7 a has a constriction 26 quite close to the conical nose portion 12 , which constriction has an extension in the radial direction which is greater than the width of the gap 39 .
  • the radial extension is about twice as large as the width of the gap or 0.2 mm.
  • the ignition unit sleeve 31 has a mouth section 41 , FIG. 3 , with an inner diameter which is slightly larger than the main portion of the sleeve 31 and a length adapted to the diameter and length of the socket 34 of the igniter 33 a, so that the igniter 33 a is secured in the charged ignition capsule 30 through press-fit between the socket 34 and the ignition unit sleeve 31 in the region of the mouth section 41 .
  • the igniter 33 a extends in the ignition capsule 30 from its socket 34 into the ignition powder charge 29 all the way to where the grooves 35 have their rear ends on the outer side of the ignition capsule/ignition unit sleeve.
  • the igniter 33 a thus is surrounded by and is in intense contact with ignition powder, which, lightly compressed, occupies essentially all available space between the cupped bottom portion 36 of the ignition unit sleeve 31 and the igniter socket 34 . Therefore, the contact between the igniter 33 a and the ignition powder charge 29 is very good, which promotes a safe ignition of the ignition powder charge when the ignition unit 32 is ignited electrically by means of the igniter 33 a.
  • the ignition capsule 30 is not an explosive product “in free state”, such as for example during transportation and storage, but that it shall be able to explode in a space which is closed by walls, such as in the ignition assembly sleeve 7 a in the primed rock cracker cartridge 1 .
  • the combustion of the ignition powder charge 29 and of the cracking powder charge 6 take place through that form of explosion which is called deflagration, in which the reaction zone proceeds during the process of combustion of the powder at a velocity which is lower than the velocity of sound in the powder charge, in contrast to detonation in detonative explosives.
  • the desired effect can be achieved, namely, according to the invention, to crack the boulder or rock portion in which the cracker cartridge has been primed in a boring, but not to fragment it into a lot of pieces which would run the risk to be thrown widely around.
  • rock cracker cartridge 1 If the rock cracker cartridge 1 is oriented in that way it can be hauled up again by means of the ignition cables 37 , if one would wish to break off the cracking operation. If the rock cracker cartridge 1 instead were oriented with the protruding spacer members 19 a directed upwards, and if one in that case would haul up the ignition cables 37 , there would be a risk that the socket 34 with the igniter 33 a or the entire ignition capsule 30 comes loose.
  • the igniter 33 a When the igniter 33 a is electrically ignited, it ignites the ignition powder charge 29 causing the ignition powder charge to explode through deflagration type of combustion.
  • the ignition unit sleeve 31 is widened by the pressure developed by the explosion so far as is possible due to the narrow gap 39 and ruptures in the regions of the strength reducing grooves 35 . Which will take place first; the widening or the rupture is difficult or impossible to say but has on the other hand no significant importance. Probably, the widening and the rupture occur as good as simultaneously.
  • delay ignition of ignition capsules and of rock cracker cartridges set at intervals may be applied according to the principles which have been disclosed in said WO 2009 / 120139 . These principles therefore shall not be repeated in this text but are instead incorporated by reference to the said WO-document.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Portable Nailing Machines And Staplers (AREA)
  • Spark Plugs (AREA)
  • Lighters Containing Fuel (AREA)
  • Drilling And Exploitation, And Mining Machines And Methods (AREA)
  • Disintegrating Or Milling (AREA)
  • Air Bags (AREA)
US13/521,702 2010-02-03 2011-01-18 Rock cracker cartridge and ignition capsule Abandoned US20130206027A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE1050103-9 2010-02-03
SE1050103A SE534577C2 (sv) 2010-02-03 2010-02-03 Stenspräckpatron och tändkapsel
PCT/SE2011/050051 WO2011096872A1 (en) 2010-02-03 2011-01-18 Rock cracker cartridge and ignition capsule

Publications (1)

Publication Number Publication Date
US20130206027A1 true US20130206027A1 (en) 2013-08-15

Family

ID=44355662

Family Applications (1)

Application Number Title Priority Date Filing Date
US13/521,702 Abandoned US20130206027A1 (en) 2010-02-03 2011-01-18 Rock cracker cartridge and ignition capsule

Country Status (10)

Country Link
US (1) US20130206027A1 (zh)
EP (1) EP2531808B1 (zh)
CN (1) CN102893119A (zh)
AU (1) AU2011213319B2 (zh)
CA (1) CA2786814C (zh)
ES (1) ES2583303T3 (zh)
PL (1) PL2531808T3 (zh)
RU (1) RU2540677C2 (zh)
SE (1) SE534577C2 (zh)
WO (1) WO2011096872A1 (zh)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105224742A (zh) * 2015-09-29 2016-01-06 鞍钢集团矿业公司 一种分析爆破作用下台阶边坡稳定性的方法
US10365077B2 (en) * 2015-10-05 2019-07-30 Life Time Engineering Ab Detonator provided with a securement device
WO2020232506A1 (en) * 2019-05-21 2020-11-26 Newcrest Mining Limited Triggering explosives in holes
WO2021167886A1 (en) 2020-02-19 2021-08-26 Dyno Nobel Inc. Canister assembly with protected cap well and booster explosive comprising the same

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8925461B2 (en) 2011-09-22 2015-01-06 Eaglepicher Technologies, Llc Low profile igniter
SE536821C2 (sv) 2011-12-23 2014-09-23 Power Tools Spräckutrustning I Herrljunga Ab Ett stenspräckningsaggregat, en apterad stenspräckpatron ochen icke-apterad stenspräckpatron samt en tändkapsel vilka ingår i aggregatet
CN103292642A (zh) * 2013-06-19 2013-09-11 中北大学 一种用于辅助清理井下巷道松软岩体的破岩弹
CN103983144A (zh) * 2014-05-19 2014-08-13 辽宁庆阳民爆器材有限公司 防脱落起爆具
WO2017145064A1 (en) * 2016-02-24 2017-08-31 Fowlds 3 Limited Cartridge with a displaceable initiator
CN107884815B (zh) * 2017-12-13 2023-09-15 山东大学 适用于隧道地震波法超前地质预报的雷管防脱落装置及方法
ES2982483T3 (es) 2019-07-22 2024-10-16 Conservator Tyche Beheer B V Dispositivo para y método de limpieza de instalaciones
EP3885686A1 (en) 2020-03-26 2021-09-29 Conservator Tyche Beheer B.V. Method of and charge for cleaning incinerator heat exchangers
CN113008091B (zh) * 2021-03-05 2022-03-08 南京工业大学 一种用于提高隧道光面爆破效果的聚能缓冲装置及其方法
CN114838627B (zh) * 2022-04-08 2023-03-21 中国科学技术大学 一种基于笑气自分解反应的爆破筒

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1856431A (en) * 1930-05-29 1932-05-03 Atlas Powder Co Electric ignition device
US3420173A (en) * 1967-03-31 1969-01-07 Atlas Chem Ind Axially expandable and contractable container
US3517616A (en) * 1967-12-19 1970-06-30 Atlas Chem Ind Axially expandable and contractable container
US5841063A (en) * 1994-03-10 1998-11-24 Bofors Ab Cased ammunition
US6679175B2 (en) * 2001-07-19 2004-01-20 Rocktek Limited Cartridge and method for small charge breaking
US7565930B2 (en) * 2005-02-23 2009-07-28 Seekford Dale B Method and apparatus for stimulating wells with propellants
US20120090491A1 (en) * 2009-04-01 2012-04-19 Chemring Energetics Uk Limited Explosive charge
US8201500B2 (en) * 2008-03-26 2012-06-19 Bengtsson Jan-Aake Powder charged rock cracker cartridge

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3451341A (en) * 1967-09-22 1969-06-24 Hercules Inc Booster structure
US3971320A (en) * 1974-04-05 1976-07-27 Ici United States Inc. Electric initiator
US5661256A (en) * 1996-01-16 1997-08-26 The Ensign-Bickford Company Slider member for booster explosive charges
US5763816A (en) * 1996-07-26 1998-06-09 Slurry Explosive Corporation Explosive primer
RU2251653C2 (ru) * 2002-10-30 2005-05-10 Федеральное государственное унитарное предприятие Новосибирский завод искусственного волокна Блок для промышленных вв

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1856431A (en) * 1930-05-29 1932-05-03 Atlas Powder Co Electric ignition device
USRE18837E (en) * 1930-05-29 1933-05-23 rolland
US3420173A (en) * 1967-03-31 1969-01-07 Atlas Chem Ind Axially expandable and contractable container
US3517616A (en) * 1967-12-19 1970-06-30 Atlas Chem Ind Axially expandable and contractable container
US5841063A (en) * 1994-03-10 1998-11-24 Bofors Ab Cased ammunition
US6679175B2 (en) * 2001-07-19 2004-01-20 Rocktek Limited Cartridge and method for small charge breaking
US7565930B2 (en) * 2005-02-23 2009-07-28 Seekford Dale B Method and apparatus for stimulating wells with propellants
US8201500B2 (en) * 2008-03-26 2012-06-19 Bengtsson Jan-Aake Powder charged rock cracker cartridge
US20120090491A1 (en) * 2009-04-01 2012-04-19 Chemring Energetics Uk Limited Explosive charge

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105224742A (zh) * 2015-09-29 2016-01-06 鞍钢集团矿业公司 一种分析爆破作用下台阶边坡稳定性的方法
US10365077B2 (en) * 2015-10-05 2019-07-30 Life Time Engineering Ab Detonator provided with a securement device
WO2020232506A1 (en) * 2019-05-21 2020-11-26 Newcrest Mining Limited Triggering explosives in holes
US12066278B2 (en) 2019-05-21 2024-08-20 Newcrest Mining Limited Triggering explosives in holes
WO2021167886A1 (en) 2020-02-19 2021-08-26 Dyno Nobel Inc. Canister assembly with protected cap well and booster explosive comprising the same
EP4107472A4 (en) * 2020-02-19 2024-03-06 Dyno Nobel Inc. CANISTER ARRANGEMENT WITH PROTECTED CAP AND BOOSTER EXPLOSIVE PROVIDED WITH IT

Also Published As

Publication number Publication date
RU2012136140A (ru) 2014-03-10
PL2531808T3 (pl) 2016-11-30
ES2583303T3 (es) 2016-09-20
AU2011213319A1 (en) 2012-08-16
EP2531808B1 (en) 2016-04-20
SE534577C2 (sv) 2011-10-11
CA2786814A1 (en) 2011-08-11
EP2531808A1 (en) 2012-12-12
AU2011213319B2 (en) 2015-04-30
RU2540677C2 (ru) 2015-02-10
CN102893119A (zh) 2013-01-23
SE1050103A1 (sv) 2011-08-04
WO2011096872A1 (en) 2011-08-11
CA2786814C (en) 2018-09-11
EP2531808A4 (en) 2015-05-06

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STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION