EP0204243A2 - Perforatrices de roche à percussion - Google Patents

Perforatrices de roche à percussion Download PDF

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Publication number
EP0204243A2
EP0204243A2 EP86107126A EP86107126A EP0204243A2 EP 0204243 A2 EP0204243 A2 EP 0204243A2 EP 86107126 A EP86107126 A EP 86107126A EP 86107126 A EP86107126 A EP 86107126A EP 0204243 A2 EP0204243 A2 EP 0204243A2
Authority
EP
European Patent Office
Prior art keywords
drill bit
drill
tube
hole
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.)
Withdrawn
Application number
EP86107126A
Other languages
German (de)
English (en)
Other versions
EP0204243A3 (fr
Inventor
John Arthur Hurt
John Callam Allan Templeton Brown
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.)
WEAVER AND HURT Ltd
Original Assignee
WEAVER AND HURT Ltd
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 WEAVER AND HURT Ltd filed Critical WEAVER AND HURT Ltd
Publication of EP0204243A2 publication Critical patent/EP0204243A2/fr
Publication of EP0204243A3 publication Critical patent/EP0204243A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
    • E21B21/12—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor using drilling pipes with plural fluid passages, e.g. closed circulation systems
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B4/00—Drives for drilling, used in the borehole
    • E21B4/06—Down-hole impacting means, e.g. hammers
    • E21B4/14—Fluid operated hammers

Definitions

  • This invention relates to rock drills, and is particularly concerned with rock drills for producing a bore and as are frequently referred to as down-the-hole drills.
  • Down-the-hole drills are known and in which a compressed air supply is supplied to the drill and which, via an air diverter and suitable porting, causes a piston within the drill to reciprocate at high frequency and on its down-stroke to strike the end of a drill bit.
  • chippings and other debris collect in the bottom of the hole and can impede the drilling operation. Consequently, it is important that such chippings and debris is removed efficiently.
  • it is frequently so that the nature of the rock or the like through which the bore is being produced needs to be analysed and when again there is a need for a means of bringing such chippings and debris as are created during drilling to the surface for analysis.
  • the object of the present invention is to provide a rock drill generally of the type referred to above and where clearing of chippings and debris from the bottom of a hole can be substantially guaranteed.
  • a rock drill comprises an outer wear tube, an inner centre tube, a drill bit mounted on the end of the centre tube, a reciprocal piston slidably mounted on the centre tube, an air diverter located within the drill at a position between a compressed air inlet to the drill and the piston, and porting means for the selective direction of compressed air to one side or the other of the piston to cause its reciprocation at high frequency, the arrangement being such that the piston, at the end of its down-stroke, strikes the inner end of the drill bit, and there being porting means closed by the piston during its down-stroke and opened on commencement of its return stroke to direct exhaust air to an annular passageway between the end of the wear tube and the drill bit and whereby air is exhausted in its entirety around the periphery of the drill bit to the bottom of the hole, from where it enters a central bore through the drill bit and is exhausted through the centre tube carrying with it all chippings and debris gathered in the bottom of the hole. Whilst the annular passageway can be formed between the end of the wear
  • the longitudinal bore through the drill bit towards its cutting face is set at an acute angle to the longitudinal axis of the drill bit, this offsetting of the end of the longitudinal bore ensuring that a core of material is not produced, irrespective as to the nature of the material through which the drill is passing.
  • the invention therefore provides a means of cleaning the bottom of a hole and bringing chippings and other debris to the surface for subsequent analysis that can substantially be guaranteed to function efficiently nc trailer what drilling conditions are encountered.
  • a down-the hole rock drill as an outer wear sleeve 1 secured at one end to a back head 2 and at the opposite end to a chuck 3.
  • a check valve 4 Located within the wear tube at the end towards the back head is a check valve 4 in sealing engagement with an air diverter 5, an inner cylinder 6 being mounted on the air diverter, and extending to a bearing 7 located within the wear tube at the end towards the chuck 3, the outer diameter of the inner cylinder and the inner diameter of the wear tube being such as to provide an annular gap 8.
  • the air diverter 5 has a through bore in which is fitted a centre tube 9, a drill bit 10 being mounted on the opposite end of the centre tube through an interposed bearing 11.
  • the outer surface of the drill bit and the inner surface of the chuck are correspondingly splined as indicated at 12, the splines being so dimensioned as to provide a nurrber of gas passageways 13 around the drill bit 10. Lying within the wear seeve 1 between the chuck 3 and the tearing 7 is a split spacer 14 on which is provided a bit retainer 15.
  • a piston 16 Within the cylinder 6 and surrounding the centre tube 9 is a piston 16 having an enlarged bore 17 at one end for sliding engagement over a stem 18 on the air diverter 5 and there being an annular gap 19 between the through bore of the piston and the centre tube 9.
  • the piston 16 has two inlet ports 20, 21 from which, respectively, extend gas passage-ways 22, 23, the inlet ports 20, 21 respectively selectively co-operating with ports 24, 25 through the wall of the cylinder 6.
  • a dual pipe joint 26 is provided, locating a centre tube 27 co-axially with a bore through the check valve 4 leading to the centre tube 9, and an outer tube 28 to provide an annular gas passageway 29 for incoming pressure air.
  • the drill bit 10 has a centre bore 30 in contiuation of the centre tube 9, and at its front end, the drill bit is provided with an angled gas passageway 31.
  • the piston extends through the bearing 7 and is in contact with the end of the drill bit.
  • the piston, the bearing 7 and the cylinder 6 define a chamber 32 into which the passageway 22 in the piston emerges, and the port 20 in the piston is in register with the port 2ij through the cylinder wall.
  • the chamber 33 is communicated with the passageways 13 around the drill bit to exhaust any pressure air, and as the piston clears the bearing 7, pressure air in the chamber 32 is also exhausted through the passageways 13.
  • the port 21 in the piston is in register with the port 25 in the cylinder, to direct pressure air to the chamber 33, to apply a downward force on the piston to drive it into contact with the end of the drill bit.
  • the piston is caused to reciprocate at high speed, with pressure air in the chambers 32 and 33 being alternately exhausted through the passageways 13 around the exterior of the drill bit. Consequently, all of the exhausted air passes around the exterior of the drill bit and into the bottom of the hole being drilled from where it escapes through the angled passageway 31 in the bit and up through the centre of the drill, carrying with it dirt and debris congregating in the bottom of the hole.
  • the angled disposition of the gas passageway through the drill bit has the effect of avoiding that passageway becoming blocked as drilling of a hole progresses.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)
  • Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
EP86107126A 1985-06-07 1986-05-26 Perforatrices de roche à percussion Withdrawn EP0204243A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8514505 1985-06-07
GB858514505A GB8514505D0 (en) 1985-06-07 1985-06-07 Rock drills

Publications (2)

Publication Number Publication Date
EP0204243A2 true EP0204243A2 (fr) 1986-12-10
EP0204243A3 EP0204243A3 (fr) 1988-07-27

Family

ID=10580386

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86107126A Withdrawn EP0204243A3 (fr) 1985-06-07 1986-05-26 Perforatrices de roche à percussion

Country Status (3)

Country Link
EP (1) EP0204243A3 (fr)
AU (1) AU5805286A (fr)
GB (2) GB8514505D0 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1988003220A1 (fr) * 1986-10-24 1988-05-05 William Lister Marteau piqueur pneumatique
EP0288180A2 (fr) * 1987-04-23 1988-10-26 Supply International Pty Ltd Seismic Marteau de forage pour fond de trou
WO2023198568A1 (fr) * 2022-04-13 2023-10-19 Sandvik Mining And Construction Oy Manchon de protection pour ensemble de forage à percussion

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU623434B2 (en) * 1988-09-22 1992-05-14 William Lister Improvements in pneumatic percussion hammers
US5139096A (en) * 1988-09-22 1992-08-18 William Lister Pneumatic percussion hammers
AU631220B2 (en) * 1989-06-19 1992-11-19 John Kitching Reverse circulation drilling apparatus
WO1991016521A1 (fr) * 1990-04-19 1991-10-31 Werner Giehl Agencement de forage a percussion
US5685380A (en) * 1995-01-06 1997-11-11 Minroc Technical Promotions Limited Reverse circulation down-the-hole drill
IE80718B1 (en) * 1995-01-06 1998-12-30 Minroc Techn Promotions Ltd A reverse circulation down-the-hole drill

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3934662A (en) * 1973-08-29 1976-01-27 Bakerdrill, Inc. Core bit
US3991834A (en) * 1975-07-07 1976-11-16 Curington Alfred R Sampling airhammer apparatus
US4321974A (en) * 1978-12-16 1982-03-30 Hydroc Gesteinsbohrtechnik Gmbh Annular drilling hammer
US4509606A (en) * 1980-10-29 1985-04-09 Walker-Neer Manufacturing Co., Inc. Axial return hammer

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1558974A1 (de) * 1967-09-26 1970-04-02 Grossbohrloch Und Spreng Unter Ringtieflochhammer

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3934662A (en) * 1973-08-29 1976-01-27 Bakerdrill, Inc. Core bit
US3991834A (en) * 1975-07-07 1976-11-16 Curington Alfred R Sampling airhammer apparatus
US4321974A (en) * 1978-12-16 1982-03-30 Hydroc Gesteinsbohrtechnik Gmbh Annular drilling hammer
US4509606A (en) * 1980-10-29 1985-04-09 Walker-Neer Manufacturing Co., Inc. Axial return hammer

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1988003220A1 (fr) * 1986-10-24 1988-05-05 William Lister Marteau piqueur pneumatique
GB2215757A (en) * 1986-10-24 1989-09-27 William Lister A pneumatic percussion hammer
US4911250A (en) * 1986-10-24 1990-03-27 William Lister Pneumatic percussion hammer
GB2215757B (en) * 1986-10-24 1990-05-30 William Lister A pneumatic percussion hammer
EP0288180A2 (fr) * 1987-04-23 1988-10-26 Supply International Pty Ltd Seismic Marteau de forage pour fond de trou
EP0288180A3 (fr) * 1987-04-23 1989-11-23 Supply International Pty Ltd Seismic Marteau de forage pour fond de trou
WO2023198568A1 (fr) * 2022-04-13 2023-10-19 Sandvik Mining And Construction Oy Manchon de protection pour ensemble de forage à percussion

Also Published As

Publication number Publication date
GB8514505D0 (en) 1985-07-10
GB2175941A (en) 1986-12-10
GB8612767D0 (en) 1986-07-02
EP0204243A3 (fr) 1988-07-27
AU5805286A (en) 1986-12-11

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Inventor name: HURT, JOHN ARTHUR

Inventor name: TEMPLETON BROWN, JOHN CALLAM ALLAN