US3172361A - Gas operated blasting cartridge - Google Patents

Gas operated blasting cartridge Download PDF

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Publication number
US3172361A
US3172361A US83705A US8370561A US3172361A US 3172361 A US3172361 A US 3172361A US 83705 A US83705 A US 83705A US 8370561 A US8370561 A US 8370561A US 3172361 A US3172361 A US 3172361A
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US
United States
Prior art keywords
container
tube
length
orifices
gas
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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
Application number
US83705A
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English (en)
Inventor
Thouzeau Georges
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.)
Charbonnages de France CDF
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Charbonnages de France CDF
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Application filed by Charbonnages de France CDF filed Critical Charbonnages de France CDF
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Publication of US3172361A publication Critical patent/US3172361A/en
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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21C—MINING OR QUARRYING
    • E21C37/00—Other methods or devices for dislodging with or without loading
    • E21C37/06—Other methods or devices for dislodging with or without loading by making use of hydraulic or pneumatic pressure in a borehole
    • E21C37/14—Other methods or devices for dislodging with or without loading by making use of hydraulic or pneumatic pressure in a borehole by compressed air; by gas blast; by gasifying liquids

Definitions

  • the present invention relates to improvements in or relating to air blasting devices of the type wherein a gas compressed to a very high pressure enclosed in a container is abruptly expanded by the rupture of a plate or actuation of a piston under the effect of the gas pressure, and injected through vents into the rock mass to be blasted or shattered.
  • the invention provides improvements in devices for introducing compressed gas into the said container.
  • the invention applies to the method of introducing highpressure gas, which is generally compressed air, into the container which is closed by the device adapted to yield and be displaced under the action of the pressure.
  • the compressed-air supply tube can be provided with apertures for discharging a portion of the air at other points where it is desired to produce a cooling effect. But tests by the applicant have shown that the number, the position and the cross-sectional area of the apertures are far from being unimportant if any risk of oil ignition is to be obviated.
  • the invention is characterised in that, in an air-blasting device wherein the blast is effected by a sudden expansion due to the provision of means yieldable and/ or movable under pressure, the tube for the introduction of the compressed gas having a length equal to or greater than twothirds of the length of the container, has a minimum of four lateral apertures.
  • the cross-section and the position of these apertures are so corelated that the mass of fluid introduced per unit volume of the container is substantially constant at any given moment over the entire length of the container.
  • the length of the compressed gas supply tube is at least equal to fourfifths of the length of the container.
  • the lateral apertures are of increasing cross-sectional area commencing with those nearest to the tube inlet until those nearest to the extremity of the tube in the case of a cylindrical container.
  • the spacing of the lateral apertures decreases from the inlet to the extremity of the tube.
  • the orifices are arranged in one or more helices.
  • the compressed gas supply tube comprises a minimum of eight lateral openings.
  • FIGURE 1 shows diagrammatically the tube test arrangement
  • FIGURE 2 shows diagrammatically a firing container provided with a gas input tube having four orifices formed therein;
  • FIGURES 3A-3B and 4 show, diagrammatically, modified embodiments of compressed gas input tubes in accordance with the invention.
  • An oil reservoir 1 having a capacity of a few hundred cubic centimeters immediately follows the firing valve 2 (compressed air inlet valve).
  • a pipe 3 of as small a length as possible (10 m.) connects the unit comprised by the firing valve 2 and the oil reservoir 1 with the con tainer 4 provided with a plate 7.
  • the firing containers under test are cylindrical and have an internal diameter of 63.5 mm.
  • the compressed air supply tubes 5 are made of copper, have an internal diameter of 4.5 mm. and an external diameter of 9.5 mm. They penetrate into the container 4 provided with a coupling 6.
  • the tube diagrammtaically illustrated in FIGURE 2 is a firing container 4 provided or not with a compressed gas supply tube 5 penetrating into the tube 4 from a coupling 6.
  • a plate (not shown) closes the firing container; this plate yields under a given pressure and releases the gas into the rock mass to be blasted or shattered through vents 8 (FIGURE 1).
  • This tube has two holes 9, which are preferably diametrically opposed, have a diameter of 1.3 mm., are located in the coupling, and, if desired, have two further holes 9 (which are also preferably diametrically opposed) located at a distance d from this coupling.
  • Dilferent types of tubes have been tested having the following characteristics (the references used in the following table as well as in those further on are as given in general in FIG- URE l).
  • firing containers in accordance with the invention whose compressed air input tubes are provided with orifices 9, the first two of which are located adjacent the inlet coupling or in this coupling (FIGURES 3A and 3B) and the others as shown in i Comparison between tests Nos. 1, 2, 3 and 10 on the the, one hand, and tests Nos. 4, 5, 6, 7, 8, 9, 11 and 16 on the other hand, shows that the danger of oil-air explosion is greatiy reduced by the use of an inlet tube in accordance with
  • Table H have also been tested. Moreover, tests Nos. 12, 13, 14 and 15 show that Table 11 Overall Length of Distances Successive length Length of the combetween 2 diameters of Type of of the container, pressed Total orifices orifices from tube firing mm. air supply number (other than the first two (figures tube, mm. tube, mm. of the first to the ex- 311 and 3B) orifices two), mm. tremrty, mm.
  • the orifices are thus arranged in the following manner:
  • the first two orifices are of identical diameter, are disposed either in the coupling 6 or a few centimeters from this coupling and are diametrically opposed in the tube. Those following are at distances and have diameters as shown in Table II. They are arranged helically so that two successive orifices are located on generatrices of the tube at 90 to each other.
  • the orifice 9 have the same diameter (1.5 mm.), the distance between two successive orifices decreasing from the first two which are adjacent the coupling 6 up to the extremity of the tube.
  • the above disclosure relates to tests carried out with containers of the type provided with a plate.
  • the results may be applied to all kinds of firing containers operated by the expansion of a compressed gas.
  • An air blasting device comprising an elongate container adapted to receive gas under pressure and having vents therein, a vent plugging means in said container adapted to yield to uncover said vents, and a tube for introducing compressed gas into said container, said tube extending longitudinally and into one end of said container and having the end thereof in the container open, said tube having a length in the container equal to at least two-thirds of the length of the container and at least four orifice means in the Wall of said tube communicating the interior of the tube with the container, said orifice means being along substantially the entire length of said tube for introducing into said container along the length thereof masses of compressed gas which are substantially equal to each other, whereby to eflFect equal increase of pressure throughout the length of said container during the filling thereof.
  • An air blasting device comprising an elongate container adapted to receive gas under pressure and having vents therein, a vent plugging means in said container adapted to yield to uncover said vents, and a tube for introducing compressed gas into said container, said tube extending longitudinally and into one end of said container and having the end thereof in the container open, said tube having a length in the container equal to at least four-fifths of the length of the container and having at least seven orifices in the Wall of said tube communicating the interior of said tube with the container, said orifices each being of a diameter equal to one-third of the internaldiameter of said tube, each orifice being further from the adjacent orifice closer the said one end of the container than from the adjacent orifice closer the free end of the tube, the ratios of the spacings between said orifices being 15:10:7:5:3:2.

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
US83705A 1960-01-30 1961-01-19 Gas operated blasting cartridge Expired - Lifetime US3172361A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR817165A FR1257666A (fr) 1960-01-30 1960-01-30 Perfectionnements aux dispositifs d'abattage par soufflage

Publications (1)

Publication Number Publication Date
US3172361A true US3172361A (en) 1965-03-09

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ID=8724559

Family Applications (1)

Application Number Title Priority Date Filing Date
US83705A Expired - Lifetime US3172361A (en) 1960-01-30 1961-01-19 Gas operated blasting cartridge

Country Status (3)

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US (1) US3172361A (fr)
FR (1) FR1257666A (fr)
GB (1) GB922202A (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5231245A (en) * 1988-01-12 1993-07-27 Explosive Developments Limited Explosives
WO1998010169A1 (fr) * 1996-09-06 1998-03-12 Alan Colin Mcgowan Dispositif d'abattage a l'explosif
US6187096B1 (en) 1999-03-02 2001-02-13 Bruno H. Thut Spray assembly for molten metal

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB339983A (en) * 1929-09-14 1930-12-15 David Hodge Improvements in and relating to blasting cartridges
US1803501A (en) * 1928-06-23 1931-05-05 Safety Mining Co Blasting mechanism
US1805541A (en) * 1927-02-19 1931-05-19 Safety Mining Co Blasting cartridge
US1882365A (en) * 1927-02-19 1932-10-11 Safety Mining Co Heating cartridge
GB387068A (en) * 1931-11-20 1933-02-02 David Hodge Improvements in and relating to blasting cartridges
US2161041A (en) * 1934-04-05 1939-06-06 Cardox Corp Material-breaking device
US2750886A (en) * 1951-03-16 1956-06-19 Armstrong Coalbreak Company Gas pressure blasting device
US2778309A (en) * 1952-08-14 1957-01-22 Armstrong Coalbreak Company Gas pressure blasting device

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1805541A (en) * 1927-02-19 1931-05-19 Safety Mining Co Blasting cartridge
US1882365A (en) * 1927-02-19 1932-10-11 Safety Mining Co Heating cartridge
US1803501A (en) * 1928-06-23 1931-05-05 Safety Mining Co Blasting mechanism
GB339983A (en) * 1929-09-14 1930-12-15 David Hodge Improvements in and relating to blasting cartridges
GB387068A (en) * 1931-11-20 1933-02-02 David Hodge Improvements in and relating to blasting cartridges
US2161041A (en) * 1934-04-05 1939-06-06 Cardox Corp Material-breaking device
US2750886A (en) * 1951-03-16 1956-06-19 Armstrong Coalbreak Company Gas pressure blasting device
US2778309A (en) * 1952-08-14 1957-01-22 Armstrong Coalbreak Company Gas pressure blasting device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5231245A (en) * 1988-01-12 1993-07-27 Explosive Developments Limited Explosives
WO1998010169A1 (fr) * 1996-09-06 1998-03-12 Alan Colin Mcgowan Dispositif d'abattage a l'explosif
US6305752B1 (en) 1996-09-06 2001-10-23 Mcgowan Alan Colin Pneumatic blasting device
US6187096B1 (en) 1999-03-02 2001-02-13 Bruno H. Thut Spray assembly for molten metal

Also Published As

Publication number Publication date
FR1257666A (fr) 1961-04-07
GB922202A (en) 1963-03-27

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