EP0081897B1 - Schlagbohrmaschine - Google Patents

Schlagbohrmaschine Download PDF

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Publication number
EP0081897B1
EP0081897B1 EP82304174A EP82304174A EP0081897B1 EP 0081897 B1 EP0081897 B1 EP 0081897B1 EP 82304174 A EP82304174 A EP 82304174A EP 82304174 A EP82304174 A EP 82304174A EP 0081897 B1 EP0081897 B1 EP 0081897B1
Authority
EP
European Patent Office
Prior art keywords
piston
cylinder
bit
ports
tube
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
Application number
EP82304174A
Other languages
English (en)
French (fr)
Other versions
EP0081897A1 (de
Inventor
John Arthur Hurt
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
Priority to AT82304174T priority Critical patent/ATE19130T1/de
Publication of EP0081897A1 publication Critical patent/EP0081897A1/de
Application granted granted Critical
Publication of EP0081897B1 publication Critical patent/EP0081897B1/de
Expired 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
    • 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 earth boring equipment, and is particularly concerned with the type including a percussive drill as specified in the precharacterizing part of claim 1.
  • valved drills a piston is provided within a cylinder, above which is a valve seat provided with port holes to direct compressed air either to the side of the piston to cause an up or return stroke or to the side of the piston to cause a down or drive stroke, as is dictated by a flap valve associated with the valve seat.
  • a flap valve associated with the valve seat.
  • valveless drills which are far better suited to high pressure applications
  • a combination of ports closable by the piston itself are provided, and with air passageways extending through the piston, pressure air can be directed to one side of the piston to provide an up or return stroke, or to the other side of the piston to provide a down or drive stroke.
  • a drill bit is struck by the piston at the end of the drive stroke, the drill bit being held in a chuck at the end of a wear sleeve surrounding the cylinder.
  • valveless percussive drills Of particular importance in valveless percussive drills is the fact that a central bore is provided through the drill bit, so that compressed air can cyclically be passed into the bore hole to clear debris from around the drill bit, and encourage its passage up the bore hole outside the wear tube. Thus, as, or immediately prior to, the piston striking the bit, compressed air is fed to the cylinder beyond the piston in the direction of the drill bit, to provide the force for the up or return stroke.
  • the object of the invention is to provide earth boring equipment with percussive drills of the valveless type which eliminates the abovemen- tioned disadvantages.
  • a valveless percussive drill for earth boring equipment comprising an outer wear tube, compressed air inlet means to one end of the wear tube, chuck means for holding a drill bit to the opposite end of the wear tube, a cylinder located within the wear tube with an annular gap therebetween, an air diverter located at the end of the cylinder towards the air inlet, a bearing located at the end of the cylinder towards the chuck, and a piston within the cylinder and there being porting to direct air to one side or the other of the piston to provide a drive and a return stroke, is characterised in that said bearing is a sealing bearing and said piston has a portion of reduced diameter adapted to pass in sealed relationship through the sealing bearing to strike a bit held in the chuck.
  • the chamber formed between the piston and the cylinder at that end is effectively sealed from the bore through the drill bit by relatively simply, highly efficient and robust means, thereby avoiding completely a source of repeated drill failures in prior constructions.
  • valveless percussive drill bit for earth boring equipment is illustrated in the accompanying drawing which is a part sectional side elevation through a valveless percussive drill bit of the invention.
  • a valveless percussive drill bit has an outer wear tube 1 provided at one end with a compressed air inlet or backhead 2 and at the opposite end is a chuck 3 in which is secured a drill bit 4.
  • a cylinder 5 Located within the wear tube 1 is a cylinder 5, there being between the cylinder and the wear tube an annular gap of approximately 1,9 mm (0.075 inches).
  • a diverter block 6 is provided to allow compressed air to pass from the inlet 2 to the annular gap between the cylinder and the wear tube, and at the opposite end of the cylinder an 'mtegrat seaHng bearing 7 is provided.
  • a piston 10 Spaced along the length of the cylinder 5 are two sets of ports 8 and 9, and within the cylinder there is provided a piston 10 having a first groove 11 associated with air passageways 12 and a second groove 13 associated with air passageways 14. At the end of the piston towards the sealing bearing 7, there is provided a projection portion 15 of reduced diameter, and of a diameter to constitute a sliding fit within the sealing bearing.
  • the inertia in the piston will bring it down the cylinder until such time as the end of the portion of reduced diameter is in contact with the end of the drill bit 4.
  • the groove 13 in the piston is aligned with the inlet ports 9, and at the onset of pressure air, it is directed through the diverter 6 down the annular gap, through the ports 9 and along the air passageways 14 into a chamber 16 formed between the projecting portion 15 of the piston, the integral bearing 7 and the cylinder 5. This applies an upward force on the piston to drive the piston upwardly of the cylinder.
  • the longitudinal spacing between the inlet ports 8 and 9 and the grooves 11 and 13 is such that the grooves 13 clear the ports 9 before the grooves 11 reach the ports 8 and when compressed air is shut-off from the piston.
  • the expansion of air in the chamber 16 and the inertia in the piston allows it to complete its return stroke.
  • the groove 11 reaches the ports 8 thereby allowing progressive application of compressed air to a chamber 17 formed between the piston, the cylinder and the diverter block 6.
  • a projection 18 on the diverter block enters into a central bore 19 through the piston and the then sealed chamber 17 allows the further compression of air in the cylinder to cushion the end of the return stroke and prevent the piston from striking the diverter block 6.
  • the piston is then primed for the drive stroke and the compressed air together with the inertia of the piston drives the piston downwards until the groove 11 clears the ports 8 thereby shutting-off the supply of compressed air to the chamber 17. This occurs before the groove 13 has reached the ports 9 when again compressed air supply is shut-off from the piston, the expansion of air in the chamber 17 and the inertia of the piston allowing it to complete its drive stroke.
  • the groove 13 firstly overlaps the ports 9 and then becomes aligned with the ports 9 to allow the progressive application of compressed air through the passageways 14 to the chamber 16 by when the projection 15 on the piston has entered the sealing bearing 7, allowing the further compression of air in the now sealed chamber 16 to cushion the piston as it approaches the end of its drive stroke but not to such an extent as would prevent the end of the projection 15 from striking the end of the drill bit 4.
  • the projection 18 on the diverter block 6 clears the bore 19 through the piston allowing the release of compressed air through the bore 19 through an aligned bore 20 in the drill bit and out into the bore hole. This not only permits the start of the return stroke but also has the effect of clearing debris from around the drill bit and encouraging the passage of debris up the bore hole to the outside of the wear tube.
  • the relationship between the total area provided by the ports 8 and the ports 9 in relationship to the annular gap between the cylinder and the: wear tube is important for optimum effect but is: not critical. What is most important is that the length in the longitudinal direction and the area of the ports 8 are greater than those of the ports 9. This is to allow a greater and more prolonged; application of compressed air to the chamber 17 than to the chamber 16 because of the greater surface area of piston that has to be acted on by compressed air at that end.

Landscapes

  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)
  • Valve Device For Special Equipments (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)

Claims (5)

1. Ventilloser Schlagbohrer für Erdbohrgerät, bestehend aus einem äußeren Verschleißrohr (1), einem Preßlufteinlaß (2) am einen Ende des Verschleißrohres, einem Spannfutter (3) zum Festhalten eines Bohrstahls (4) am anderen Ende des Verschleißrohres (1), einem im Verschleißrohr (1) angeordneten Zylinder (5) mit einem Ringspalt zwischen beiden, einem Luftablenker (6) an dem dem Lufteinlaß (2) zugewandten Ende des Zylinders, einem an dem dem Spannfutter (3) zugewandten Ende des Zylinders (5) angeordneten Lager (7) und einem Kolben (10) innerhalb des Zylinders (5), wobei Kanäle (8, 9) vorgesehen sind, um Luft zur einen oder anderen Seite des Kolbens (10) zu lenken und dadurch einen Antriebs- und einen Rücklaufhub zu erzielen, dadurch gekennzeichnet, daß das Lager (7) ein abdichtendes Lager (7) ist und der Kolben (10) ein Teil (15) mit reduziertem Durchmesser besitzt, welches. abdichtend durch das abdichtende Lager (7) hindurchführbar ist, um gegen einen im Spannfutter (3) eingespannten Bohrstahl (4) zu schlagen.
2. Ventilloser Schlagbohrer für Erdbohrgerät nach Anspruch 1, dadurch gekennzeichnet, daß der Ringspalt zwischen dem Verschleißrohr (1) und dem Zylinder (5) 1,9 mm (0,075 Zoll) beträgt.
3. Ventilloser Schlagbohrer für Erdbohrgerät nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Kanäle (9) derart angeordnet sind, daß sie bei am Bohrstahl (4) anliegenden Kolben (10) mit einer Kolbennut (13) fluchten, welche mit einem Durchlaßkanal (14) verbunden ist, über welchen Preßluft einer Kammer (16) zwischen dem Zylinder (5), dem Teil (15) des Kolbens und dem Lager (7) zuführbar ist.
4. Ventilloser Schlagbohrer für Erdbohrgerät nach irgendeinem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Kanäle (8) derart angeordnet sind, daß sie bei am Ende seines Rücklaufes befindlichen Kolben (10) mit einer Kolbennut (11) fluchten, welche mit einem Durchlaßkanal (12) verbunden ist, über welchen Preßluft einer Kammer (17) zwischen dem Kolben, dem Zylinder und dem Ablenkerblock zuführbar ist.
5. Ventilloser Schlagbohrer für Erdbohrgerät nach irgendeinem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Länge der Kanäle (8,9) in Längsrichtung sowie ihre Fläche derart bestimmt sind, daß die Kammer (17) stärker und länger mit Preßluft beaufschlagbar ist als die Kammer (16) zum Ausgleich für die größere Kolbenfläche, welche an diesem Ende mit Preßluft zu beaufschlagen ist.
EP82304174A 1981-12-10 1982-08-06 Schlagbohrmaschine Expired EP0081897B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82304174T ATE19130T1 (de) 1981-12-10 1982-08-06 Schlagbohrmaschine.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8137261 1981-12-10
GB8137261 1981-12-10

Publications (2)

Publication Number Publication Date
EP0081897A1 EP0081897A1 (de) 1983-06-22
EP0081897B1 true EP0081897B1 (de) 1986-04-09

Family

ID=10526521

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82304174A Expired EP0081897B1 (de) 1981-12-10 1982-08-06 Schlagbohrmaschine

Country Status (3)

Country Link
EP (1) EP0081897B1 (de)
AT (1) ATE19130T1 (de)
DE (1) DE3270411D1 (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5957220A (en) * 1995-10-17 1999-09-28 Dresser-Rand Company Percussion drill assembly
US5662180A (en) * 1995-10-17 1997-09-02 Dresser-Rand Company Percussion drill assembly
IT1320289B1 (it) 2000-03-29 2003-11-26 Campagnolo Srl Sistema per il trasferimento di dati, ad esempio per cicli qualibiciclette da competizione.
WO2023198568A1 (en) * 2022-04-13 2023-10-19 Sandvik Mining And Construction Oy Protective sleeve for percussive drilling assembly

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1509142A (fr) * 1966-11-30 1968-01-12 Forges Et Acieries Du Saut Dut Marteau pneumatique de forage muni d'un taillant
US3503459A (en) * 1968-07-29 1970-03-31 Mission Mfg Co Percussion drill motor
DE1950508C3 (de) * 1969-10-07 1975-01-09 Fma Pokorny Frankfurter Maschinenbau Ag, 6000 Frankfurt Druckluftbetriebene Tieflochbohrhämmer
US4030554A (en) * 1975-07-07 1977-06-21 Bakerdrill, Inc. Bore hole airhammer and anvil bit
US4084647A (en) * 1976-07-01 1978-04-18 William Lister Pneumatic percussion hammer
US4098352A (en) * 1976-12-17 1978-07-04 Kennametal Inc. Percussion bit with bypass channel therein
US4163478A (en) * 1978-09-15 1979-08-07 Adcock Gerald L Self aligning impact rock drilling tool
EP0040026A1 (de) * 1980-05-09 1981-11-18 Halifax Tool Company Limited Freikolbenwerkzeug

Also Published As

Publication number Publication date
DE3270411D1 (en) 1986-05-15
EP0081897A1 (de) 1983-06-22
ATE19130T1 (de) 1986-04-15

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