US2083695A - Blasting method and apparatus - Google Patents

Blasting method and apparatus Download PDF

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Publication number
US2083695A
US2083695A US67314633A US2083695A US 2083695 A US2083695 A US 2083695A US 67314633 A US67314633 A US 67314633A US 2083695 A US2083695 A US 2083695A
Authority
US
United States
Prior art keywords
cartridge
pressure
valve
blasting
piston
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.)
Expired - Lifetime
Application number
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English (en)
Inventor
Raymond W Dull
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.)
SAFETY MINING Co
Original Assignee
SAFETY MINING CO
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
Priority to NL40654D priority Critical patent/NL40654C/xx
Application filed by SAFETY MINING CO filed Critical SAFETY MINING CO
Priority to US67314633 priority patent/US2083695A/en
Priority to US676227A priority patent/US2083696A/en
Priority to GB1367534A priority patent/GB436468A/en
Priority to FR772902D priority patent/FR772902A/fr
Application granted granted Critical
Publication of US2083695A publication Critical patent/US2083695A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/7722—Line condition change responsive valves
    • Y10T137/7837—Direct response valves [i.e., check valve type]
    • Y10T137/7904—Reciprocating valves
    • Y10T137/7922—Spring biased
    • Y10T137/7929—Spring coaxial with valve
    • Y10T137/7932—Valve stem extends through fixed spring abutment

Definitions

  • the present invention aims to provide a new method for the application of high 15 pressure air or other gases to the breaking down of coal and other materials and also to provide certain advantageous improvements in the apparatus heretofore suggested for this general purpose.
  • Figure 1 is a general view illustrating the application of the apparatus to coal mining
  • Fig. 2 is a view in longitudinal section through one form of cartridge according to the present invention
  • Figure 3 is a view in longitudinal section I through a modified form of cartridge for accomplishing the purposes of the present invention.
  • the cartridge may consist of a steel body 1 having an internal charge receiving chamber which is closed at one end of the cartridge by a cap member 8.
  • the oppomte end of the cartridge may be of solid construction in which there is pro- 35 vided a plurality of radially arranged discharge ports ii.
  • a valve controlled opening ll serves to place the interior of the cartridge in communication with the discharge ports I! under appropriate conditions.
  • the opening H is in the form of a 40 conical valve seat designed for cooperation with a correspondingly formed valve it carried on one end of a rod I2.
  • the opposite end of rod I2 is provided with a piston which fits slidably within the internal bore formed in the cartridge.
  • the 45 can 8 is provided with an axial port ll designed to be placed in communication with a high pressure air supply pipe 3, which may be coupled to the cap member 8 by the elements 8 and Ill.
  • the piston may be thought of as dividing the 50 bore in which it moves into a charge receiving space (that to the left of the piston in each figure) and a control chamber or space-the space at the rightof the piston.
  • the piston is somewhat loosely fitted to the bore within the cartridge in order that the high pressure air introduced in advance of the piston may gradually pass to the opposite side thereof to build up in the main chamber a full charge of air.
  • the piston be operated to unseat the valve is, thereby permitting the escape of the entire charge through the discharge ports I! and into the surrounding material to be broken down. This is accomplished in an exceedingly simple manner, by merely reducing the pressure in the small chamber of the cartridge in advance of the piston.
  • FIG. 3 a modified form of cartridge designed to operate on precisely the same principle as described in connection with 50 Figure 2.
  • the cartridge with its discharge ports, its end. cap and supply pipe and pipe connections are exactly the same as in Figure 2 and are designated by similar reference numerals.
  • the entire difference between the two 1 devices lies in the form of the piston and its valve.
  • the shank I6 is tapered at one end to form a valve to correspond to valve l3 in the above described construction and at its opposite end is provided with a piston.
  • the piston is suitably packed by means of cup leathers 20 and retaining rings 2
  • Disposed within the piston is a supplemental valve member IT designed for sealing engagement as indicated at I8 on a ring member IS.
  • a spring 23 serves to normally maintain the valve member I! in sealing engagement with ring IS.
  • a plurality of ports 22 provide communication from one side of the piston to the other when valve member I! is in open position.
  • FIG. 1 there is illustrated a coal face 2, suitably undercut and drilled and provided with a cartridge l of the character illustrated in either Figures 2 or 3 and a supply pipe 3 extending from the cartridge to a compressor 4.
  • the compressor 4 would normally be located in a safe position entirely out of line with the coal face to be broken down.
  • a valve 5 and a pressure gauge 6, the latter in the supply pipe 3 there is provided a valve 5 and a pressure gauge 6, the latter, of course, indicating at all times the degree of pressure which has been introduced into the cartridge.
  • a suitable lateral discharge 5' may be provided for venting the pipe 3 to the atmosphere when the valve is so adjusted.
  • the present invention provides a form of cartridge which may be discharged at will at any desired pressure ranging from slightly in excess of zero up to the maximum pressure capacity which may be developed by an air compresson Moreover, it should be realized that the method herein presented provides an arrangement wherein the cartridge may be so discharged at any desired pressure by merely operating valve 5 to cut ofl the flow of air from the compressor and to vent the pipe 3 to the atmosphere when such desired pressure has been reached as indicated by the pressure gauge 6. This method provides a degree of flexibility not heretofore obtainable with any method of blasting or breaking down material in that each individual shot may be made at a pressure designed to accomplish precisely the amount of work which that shot has to do.
  • a slight leakage of the valve at the discharge end of the cartridge is, under the present method, of very little consequence, inasmuch as such leak would occur only during the time when high pressure air was being introduced in the cartridge at a relatively rapid rate and the cartridge would be discharged immediately upon the attainment of a charge of the desired pressure.
  • the supply pipe 3 will be in the form of a suitable armored flexible tubing capable of safely carrying extremely high pressures.
  • the cartridge does not involve any item of expendable supplies other than compressed air and does not involve the making and breaking of connections each time the cartridge is discharged and prepared for recharging.
  • a relatively permanent service unit capable of performing a vast amount of useful work in an accurately controlled manner and at the expense only of the necessary volume of high pressure air or other gas.
  • the apparatus described provides a further possibility not heretofore mentioned and not obtainable with many known methods of blasting.
  • the venting of a single supply pipe feeding the high pressure air to two or more cartridges would serve to discharge.
  • each of said cartridges without possibility of failure owing to an instantaneous reduction in pressure in the control chamber of each cartridge by the venting of the common supply pipe connected thereto.
  • the source of high pressure air may be other than an air compressor and the form of the discharge mechanism within the cartridge may be widely varied.
  • a material breaking apparatus comprising a source of compressed gas, a supply pipe extending therefrom to the material to be broken, a cartridge connected to said supply pipe and adapted to be positioned in or adjacent the material to. be broken, said cartridge embodying a differential valve controlling the release of compressed gasfrom said cartridge into the material to be broken, said valve being actuated into closing position by the introduction of compressed gas into said cartridge through said supply pipe and being actuated into open position when the flow of gas is reversed, and means for cutting oil the fiow of gas from said source and reversing the flow of gas in said supply pipe, thereby effecting release of the compressed gas from said cartridge into the material to be broken.
  • the method of breaking coal or other materials including the positioning therein of a receptacle for the reception of a. charge of compressed gas, introducing therein a charge of compressed gas, and efiecting release of the charge of compressed gas at the will of the operator at any desired pressure through control of the supp y- 3.
  • Means'for providing a supply of gaseous fluid under pressure, conducting means therefrom, a receiving chamber for the compressed gas having associated therewith means for releasing the gas including 'a valve, and means controlled by the pressure in said conducting means for controlling said valve, and means associated with said conducting means for permitting variation of the pressure therewithin at the will of the operator.
  • Means for providing a supply of gaseous fluid under pressure a conducting means extending therefrom, a cartridge positioned in material to be broken and connected to said conducting means to receive therethrough a charge of compressed gas, and means interposed in said conducting means between said supply and the cartridge for effecting discharge of the cartridge.
  • a method of breaking down material which comprises the following steps; introducing into the material to be broken a container for receiving a blasting charge, charging the container when so placed to any desired blasting pressure from a remote point and effecting under remote control the discharge of the blast in the material at the operators will and irrespective of the particular blasting pressure then existent.
  • a material breaking apparatus comprising a source of blasting pressure, a cartridge for receiving a blasting charge of any desired value.
  • a container for receiving a blasting charge means for charging said container to any desired blasting pressure
  • a blasting cartridge for receiving a blasting charge, a source of blasting pressure, means for conducting blasting pressure from said source to said cartridge, means under operator control for closing off said conducting means from said pressure source and for reducing the pressure in said conducting means, and means responsive to said pressure reduction for effecting discharge of the blast from the cartridge.
  • a blasting cartridge for receiving a blasting charge, a source of blasting pressure, a pipe line for conducting pressure from said source to said cartridge, valve means for cutting off flo'w'of pressure through saidpipe line and for venting "said pipe line, and means responsive to. said venting for effecting release of the blasting charge from the cartridge.
  • a cartridge having a container for receiving a blasting charge, discharge means for said container, a valve for controlling said discharge means, a differential piston for actuating said valve and for holding said valve closed, means for conducting pressure to said container to act on the larger pressure area of said piston to hold said valve closed, valve means carried within the piston for conducting pressure past said piston to the container to act on the opposed reduced area of said piston, said valve means closing automatically upon reverse in flow of the pressure, and means 11.
  • a cartridge having I a container for receiving a charge of blasting pressure, a discharge orifice therefor, a valve for closing said orifice, a difierential piston for con-.
  • trolling said valve means for introducing pressure into said container, the pressure acting on the larger pressure area of the piston to maintain said valve closed, the pressure fiowing past the piston to the container at the other side of the piston, and means for venting the container to reduce the pressure acting on the larger area of the piston so that the pressure in the container acting on the reduced piston area effects movement of the piston to open said valve.
  • a method of blasting down material which comprises the following steps: introducing into the material a means for confining blasting pressure, supplying to said means, when the latter is in position in the material to be broken down. blasting pressure from an extraneous point, and effecting upon the attainment of substantially any desired superatmospheric pressure in said the charge into the material from the confining means.
  • a material breaking device comprising a cartridge body having a charge receiving chamber therein and a discharge orifice, a valve controlling said oriflce, means associated with said cartridge and operative on supply of pressure to said cartridge to close said valve and maintain the same closed and on venting of pressure to cause valve opening to release the charge, and means for supplying from a point extraneous to the cartridge receiving hole and venting to a point extraneous to said cartridge receiving hole fluid pressure relative to said cartridge.
  • a material breaking device consisting of a cartridge provided with a chamber adapted to be charged with compressed gas from a source of supply, means embodied in the cartridge and operable at will for efiecting repeated charging and discharging thereof, and means remotely positioned relative to the cartridge for controlling said operation of the aforesaid means.
  • the method of breaking coal or other materials including the positioning therein of a receptacle for the reception of a charge of compressed gas, introducing into said positioned receptacle a charge of compressed gas, which charge is divided in the receptacle into a control fraction and a blasting fraction, and effecting release of the blasting fraction of the charge at the will of the operator by venting from the receptacle the control fraction.
  • a blasting cartridge comprising a container adapted to be charged with a compressed fluid at blasting pressure and having an orifice through which said fluid may be discharged, and a fluid pressure controlled valve for retaining the pressure in said container and for releasing the pressure consisting of a single movable part for governing said orifice.

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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)
  • General Engineering & Computer Science (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
US67314633 1933-05-27 1933-05-27 Blasting method and apparatus Expired - Lifetime US2083695A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
NL40654D NL40654C (fr) 1933-05-27
US67314633 US2083695A (en) 1933-05-27 1933-05-27 Blasting method and apparatus
US676227A US2083696A (en) 1933-05-27 1933-06-17 Blasting method and apparatus
GB1367534A GB436468A (en) 1933-05-27 1934-05-05 Improvements in and relating to method and apparatus for the blasting and breaking down of material such as coal
FR772902D FR772902A (fr) 1933-05-27 1934-05-05 Perfectionnements aux procédés et appareils pour faire sauter ou abattre certainesmatières telles que la houille

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US67314633 US2083695A (en) 1933-05-27 1933-05-27 Blasting method and apparatus

Publications (1)

Publication Number Publication Date
US2083695A true US2083695A (en) 1937-06-15

Family

ID=24701489

Family Applications (1)

Application Number Title Priority Date Filing Date
US67314633 Expired - Lifetime US2083695A (en) 1933-05-27 1933-05-27 Blasting method and apparatus

Country Status (4)

Country Link
US (1) US2083695A (fr)
FR (1) FR772902A (fr)
GB (1) GB436468A (fr)
NL (1) NL40654C (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2619985A (en) * 1952-12-02 Ujnit
US3249177A (en) * 1961-11-13 1966-05-03 Bolt Associates Inc Acoustic wave impulse generator repeater
US4136851A (en) * 1976-08-25 1979-01-30 Chemetron Corporation Valve for fire extinguishing system of gas distribution type
US4285415A (en) * 1979-06-25 1981-08-25 Paitson John L Acoustic impulse generator
US4301731A (en) * 1979-09-12 1981-11-24 Zeto Industries, Inc. Air shooting system for the mining of coal or the like
US4497440A (en) * 1982-10-07 1985-02-05 Brownline Pipe Inc. Non-drain valve for sprinkler systems
CN103953342A (zh) * 2014-04-11 2014-07-30 山东山矿测控技术有限公司 一种用于煤矿的改进二氧化碳震裂装置及组装方法
CN106593443A (zh) * 2017-02-20 2017-04-26 山东山矿测控技术有限公司 一种用于矿山、岩石或煤岩的二氧化碳爆破结构及方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106018732B (zh) * 2016-06-27 2017-12-15 河南理工大学 瓦斯动力灾害模拟试验台快速释放装置与试验方法

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2619985A (en) * 1952-12-02 Ujnit
US3249177A (en) * 1961-11-13 1966-05-03 Bolt Associates Inc Acoustic wave impulse generator repeater
US4136851A (en) * 1976-08-25 1979-01-30 Chemetron Corporation Valve for fire extinguishing system of gas distribution type
US4285415A (en) * 1979-06-25 1981-08-25 Paitson John L Acoustic impulse generator
US4301731A (en) * 1979-09-12 1981-11-24 Zeto Industries, Inc. Air shooting system for the mining of coal or the like
US4497440A (en) * 1982-10-07 1985-02-05 Brownline Pipe Inc. Non-drain valve for sprinkler systems
CN103953342A (zh) * 2014-04-11 2014-07-30 山东山矿测控技术有限公司 一种用于煤矿的改进二氧化碳震裂装置及组装方法
CN103953342B (zh) * 2014-04-11 2016-04-06 山东山矿测控技术有限公司 一种用于煤矿的改进二氧化碳震裂装置及组装方法
CN106593443A (zh) * 2017-02-20 2017-04-26 山东山矿测控技术有限公司 一种用于矿山、岩石或煤岩的二氧化碳爆破结构及方法

Also Published As

Publication number Publication date
NL40654C (fr) 1900-01-01
GB436468A (en) 1935-10-11
FR772902A (fr) 1934-11-08

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