US2794396A - Blasting devices - Google Patents

Blasting devices Download PDF

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Publication number
US2794396A
US2794396A US443023A US44302354A US2794396A US 2794396 A US2794396 A US 2794396A US 443023 A US443023 A US 443023A US 44302354 A US44302354 A US 44302354A US 2794396 A US2794396 A US 2794396A
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United States
Prior art keywords
gas
charge
container
pressure
heating element
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Expired - Lifetime
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US443023A
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English (en)
Inventor
Smith Kenneth Ashbrooke
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.)
Imperial Chemical Industries Ltd
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Imperial Chemical Industries Ltd
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Publication date
Application filed by Imperial Chemical Industries Ltd filed Critical Imperial Chemical Industries Ltd
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Publication of US2794396A publication Critical patent/US2794396A/en
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    • 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
    • F42B3/04—Blasting cartridges, i.e. case and explosive for producing gas under pressure
    • F42B3/06—Blasting cartridges, i.e. case and explosive for producing gas under pressure with re-utilisable case

Definitions

  • the present invention relates to blasting devices of the kind in which a charge of a non-.detonating gas-producing composition, together with a suitable initiating means, is enclosed in a rigid cylindrical container provided with a closure member adapted to release the gases produced on reaction of said charge from the container at a predetermined pressure so that a blasting effect is produced in a borehole, the body of the container being sufliciently strong to withstand the pressure developed and being capable of rte-utilisation.
  • the gas release member takes the form of a rupturable disc sealing ed the container from a venting head, which is screwed 'to the container and thereby holds the rupturable disc in position, the seal being made gas-tight by the provision of a resilient gasket on one or both sides of the disc.
  • a resilient gasket on one or both sides of the disc.
  • the improved blasting device of the kind in which a charge of a non-detonatgas producing composition capable of self-sustained and selfepropagating gas. producing reaction when merely locally heated under super-atmospheric pressure together with a local heating element is enclosed in a rigid cylindrical container closed or fitted with a gas-tight closure at one end and fitted at the other end with a venting head separated from the container by a rupturable disc is characterised in that the local heating element has actuating means responsive to fiuid'pressure and in that the container at. the endwhich-is closed or fitted with a gas-tight closure permits said actuating means to be connected to an external source of fluid pressure.
  • said actuating means permits the introduction and nonvreturn of gas into the container.
  • said actuating means excludes the introduction of liquid into the container.
  • the local heating element should preferably then be one which generates the necessary gas pressure to enable said charge to undergo a self sustained and self-propagating gas-producing reaction.
  • the embodiment of the invention in which an external source of gas supply is used to cause the required superatmospheric pressure in the container has the advantage that said super-atmospheric pressure is maintained in the container notwithstanding leakages and ensures that the sudden gas evolution from the self-propagating decomposition of the charge will cause the bursting disc to rupture quickly.
  • the invention also consists in a local heating element for blasting devices of the aforesaid kind comprising a heating charge and means for the actuation thereof responsive to the application of fluid pressure.
  • a preferred form of local heating element comprises, in a sealed container, a heating charge, a percussion cap positioned to initiate the reaction of said heating charge and a projectile positioned so that on the application of fluid pressure the projectile fires said percussion cap.
  • the heating charge in these local heating elements may be of a gasproducing type or may be of a kind which reacts exothermically with the evolution of substantially no gas. Suitable compositions include mixtures of antimony and potassium permanganate and mixtures of silicon with an oxidising agent such as red lead. The amount of heating charge is sufficient to evolve about -100 calories.
  • the rupturable disc and venting cap in the blasting devices of the invention may be conventional, for example, the rupturable disc may be of mild steel or of a filled or unfilled synthetic resin such as Tufnol (registered trademark), a synthetic resin bonded paper product, adapted to burst at a pressure of the order of 10 tons/sq. in.
  • Tufnol registered trademark
  • a synthetic resin bonded paper product adapted to burst at a pressure of the order of 10 tons/sq. in.
  • the non-detonating gas-producing charge capable of a self-propagating gas-producing reaction when locally heated under super-atmospheric pressure may be for example the ammonium nitrate compositions claimed in co-pending applications Nos. 388,841, now Patent No. 2,769,701., issued November 6, 1956, and 408,102, filed February 4, 1954. It is preferred that the charge should be in a pre-packaged form and it is also preferred that the local heating element be embedded in a suitably shaped cavity at one end thereof. If desired furthermore the charge in pre-packed form can be a cylinder having a diameter to form a close fit in the rigid cylindrical container.
  • water under pressure may be used to actuate the actuating means responsive to fluid pressure of the local heating element in the blasting device of the invention it is preferred to use a gas as for example compressed air. It is further preferred to use an inert gas, as for example carbon dioxide or nitrogen gas. If air is used it is usually necessary to adjust the composition of the gas-producing charge.
  • the gas pressure required to actuate the actuating means of the local heating element should preferably be of the order of the super-atmospheric pressure required in the container. To permit the charge to undergo self-propagating decomposition quickly at a useful rate this gas pressure may range from to 1 8001bs./sq. in. i
  • the following table gives the time interval between the application of local heating to 570 gramsof a gas-pro ducing charge consisting of 49 by weight ammonium nitrate, 34% by weight magnesium "and 17% by weight woodflour in a cardboard container nitrate hexahydrate and the bursting of the rupturable disc for different gas pressures in the container of 3 litres capacity of a blasting device .at the moment of application of the local heating.
  • 1 is a high tensile steel container
  • 2 is a venting 2 head
  • 3 is a mild steel disc adapted to yield at a predetermined pressure of the order of 15 tons/sq. in.
  • 4 and .5 are gaskets
  • 6 is a firing head to which a flexible pressure tube 7 is attached by means of the nipple 8.
  • 9 is a conduit lea-ding from the nipple 8 to the 30 interior of the firing head 6, 10 is a ball valve heldv in position by the sleeve 11 in such a way that it acts as a non-return pressure valve, 12 is a gasket, 13 is a fireproofed cardboard container for the main charge 14 and 15 is a local heating element in accordance with. the invention.
  • Fig. 9 is a conduit lea-ding from the nipple 8 to the 30 interior of the firing head 6
  • 10 is a ball valve heldv in position by the sleeve 11 in such a way that it acts as a non-return pressure valve
  • 12 is a gasket
  • 13 is a fireproofed cardboard container for the main charge 14
  • 15 is a local heating element in accordance with. the invention.
  • 16 is a metal casing
  • 17 is a heating charge capable of evolving about 70 calories on reaction
  • 18 are supports for a percussion cap 19
  • 20 is a metal projectile held in position by the rubber tube 9 21 and the metal band 22 which is crimped round the; rubber tube 21 so that .an appreciable pressure is re-i quired to dislodge the projectile 20 and cause it to strike the percussion cap 19.
  • gas pressure for ex'ample compressed air, within the range 100-1800 lbs./ sq. in. is applied through the tube 7 and valve 10 whereupon the projectile 20 fires the percussion cap 19 causing the reaction of heating charge 17 to take place.
  • the heat thus formed ind-uces the reaction of the main charge 14 and thus the 60 bursting of the disc 3.
  • Example 1 A charge of 20 oz. of a non-detonating gas-producing composition consisting of 49% by weight ammonium nitrate, 34% by weight magnesium nitrate hexahydrate and 17% by Weight woodflour in a cardboard container into one end of which is inserted a safety igniter of the kind illustrated in Fig. 2 containing a heating charge consisting of 0.25 g. of a composition containing by weight antimony and by weight potassium permanganate is inserted into the pressure resistance steel container 1.'
  • Carbon dioxide is introduced through tube valve 10 at a pressure of 650 lbs/sq. in. by the sudden opening of a valve (not shown) in tube 7 and this causes the projectile 20 to strike the percussion cap 19 and thus to initiate the reaction'of the heating charge 17 e and at the same time to produce a pressure of about 650 lbs./sq. in. within thesteel container '1 thereby to permit the charge 14 to undergo quickly self-propagating decompositio'n'due to the heat evolved from'the reaction of the heating charge 17.
  • the time interval between theiconnectingof the steel container 1 to the supply of 7 and carbon dioxide by the sudden opening of the valve (not shown) in tube 7 and the rupturing of the bursting disc 3 is 4 seconds.
  • Example 2 If instead of carbon dioxide, nitrogen at 1,000 lbs/sq. in. is used in the same manner as in Example 1 to cause the projectile 20 to strike the percussion cap 19 and to produce a pressure of about 1000 lbs/sq. in.
  • the time interval between the connecting of the steel container 1 to the supply of nitrogen by the sudden opening of the valve (not shown) in tube 7 and the rupturing of the bursting disc 3 is 2 seconds.
  • a blasting device comprising a rigid hollow container, a charge of non-detonating, gas-producing composition capable of' self-sustained and self-propagating gas-producing reaction only when locally heated under a super-atmospheric pressure disposed within said rigid container, a local heating element contained within said rigid container, pressure-responsive means for actuating said heating element, and gas-tight closures sealing both ends of said container, one of said closures being provided with means providing gas under pressure to operate the actuating means of the local heating element and to subject the charge to said super-atmospheric pressure.
  • a blasting device as defined in claim 1 wherein the other of said end closures comprises a rupturable member and a venting head separated from the interior of the container by said rupturable member.
  • said gas-providing means comprises 'a one-way valve which is interposed between said container and an' external source of gas under pressure.
  • said charge of gas-producing composition comprises at least one of the hydrated nitrates of metals of low atomic weight of the group magnesium nitrate' hexahydrate and aluminum nitrate nonahydrate, and anon-explosive organic fuel consisting substantially of a dried vegetable carbohydrate material, wherein the number of moles of combined water in the metal nitrate per mole of ammonium nitrate lies between 1 and 3 and wherein the proportion of the organic fuel in the pulverulent mixture is such that the gases from the charge and said heating 7 element consist at the bursting pressure of said blasting device substantially of steam, carbon dioxide and nitrogen.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Disintegrating Or Milling (AREA)
  • Drilling And Exploitation, And Mining Machines And Methods (AREA)
  • Air Bags (AREA)
US443023A 1953-11-02 1954-07-13 Blasting devices Expired - Lifetime US2794396A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB30193/53A GB748848A (en) 1953-11-02 1953-11-02 Blasting devices

Publications (1)

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US2794396A true US2794396A (en) 1957-06-04

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US443023A Expired - Lifetime US2794396A (en) 1953-11-02 1954-07-13 Blasting devices

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US (1) US2794396A (is")
BE (1) BE532949A (is")
DE (1) DE1047092B (is")
FR (1) FR1110144A (is")
GB (1) GB748848A (is")

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2857845A (en) * 1954-09-29 1958-10-28 Olin Mathieson Explosive device
US2926638A (en) * 1957-06-26 1960-03-01 Herbert A Magnus Thruster with by-pass
US3011441A (en) * 1958-09-11 1961-12-05 Ici Ltd Igniter device
US4038900A (en) * 1976-07-19 1977-08-02 The United States Of America As Represented By The Secretary Of The Navy Explosive closure valve
CN104776766A (zh) * 2015-05-05 2015-07-15 山东名世矿业机械有限公司 二氧化碳致裂器装置及使用该装置的发热配方
CN104792235A (zh) * 2015-03-12 2015-07-22 韩立艳 一种管式环保型矿石爆破装置
US10088285B1 (en) * 2016-12-15 2018-10-02 The United States Of America As Represented By The Secretary Of The Navy Cook-off mitigation systems using an uncanistered outgassing pad
US10101139B1 (en) * 2016-12-15 2018-10-16 The United States Of America As Represented By The Secretary Of The Navy Cook-off mitigation systems
CN113566655A (zh) * 2020-04-28 2021-10-29 广东中人岩土工程有限公司 一种矿用二氧化碳爆破装置
CN116147439A (zh) * 2022-09-09 2023-05-23 石家庄铁道大学 一种二氧化碳爆破装置及方法
CN116463581A (zh) * 2023-03-01 2023-07-21 杭州电子科技大学 一种防强力撞击材料制备方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1189902B (de) * 1964-04-03 1965-03-25 Dr Georg Groetsch Gasdrucksprengpatrone mit mechanisch betaetigter Zuendung und druckgaserzeugender Ladung
CN113107484B (zh) * 2021-04-06 2022-10-18 湖北楚道凿岩工程有限公司 露天矿山开采的二氧化碳致裂爆破管及爆破施工方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1705248A (en) * 1927-10-01 1929-03-12 Harry S Hart Blasting cartridge
US1856849A (en) * 1929-10-07 1932-05-03 Safety Mining Co Blasting cartridge and method and means for operating the same
US2046194A (en) * 1933-12-15 1936-06-30 Ici Ltd Blasting charge
US2583802A (en) * 1948-03-01 1952-01-29 Ici Ltd Explosive booster
US2652775A (en) * 1951-06-06 1953-09-22 Du Pont Percussion initiated detonator

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1705248A (en) * 1927-10-01 1929-03-12 Harry S Hart Blasting cartridge
US1856849A (en) * 1929-10-07 1932-05-03 Safety Mining Co Blasting cartridge and method and means for operating the same
US2046194A (en) * 1933-12-15 1936-06-30 Ici Ltd Blasting charge
US2583802A (en) * 1948-03-01 1952-01-29 Ici Ltd Explosive booster
US2652775A (en) * 1951-06-06 1953-09-22 Du Pont Percussion initiated detonator

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2857845A (en) * 1954-09-29 1958-10-28 Olin Mathieson Explosive device
US2926638A (en) * 1957-06-26 1960-03-01 Herbert A Magnus Thruster with by-pass
US3011441A (en) * 1958-09-11 1961-12-05 Ici Ltd Igniter device
US4038900A (en) * 1976-07-19 1977-08-02 The United States Of America As Represented By The Secretary Of The Navy Explosive closure valve
CN104792235A (zh) * 2015-03-12 2015-07-22 韩立艳 一种管式环保型矿石爆破装置
CN104776766A (zh) * 2015-05-05 2015-07-15 山东名世矿业机械有限公司 二氧化碳致裂器装置及使用该装置的发热配方
US10088285B1 (en) * 2016-12-15 2018-10-02 The United States Of America As Represented By The Secretary Of The Navy Cook-off mitigation systems using an uncanistered outgassing pad
US10101139B1 (en) * 2016-12-15 2018-10-16 The United States Of America As Represented By The Secretary Of The Navy Cook-off mitigation systems
CN113566655A (zh) * 2020-04-28 2021-10-29 广东中人岩土工程有限公司 一种矿用二氧化碳爆破装置
CN116147439A (zh) * 2022-09-09 2023-05-23 石家庄铁道大学 一种二氧化碳爆破装置及方法
CN116147439B (zh) * 2022-09-09 2024-05-10 石家庄铁道大学 一种二氧化碳爆破装置及方法
CN116463581A (zh) * 2023-03-01 2023-07-21 杭州电子科技大学 一种防强力撞击材料制备方法

Also Published As

Publication number Publication date
DE1047092B (de) 1958-12-18
FR1110144A (fr) 1956-02-06
GB748848A (en) 1956-05-09
BE532949A (is")

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