CA2470227A1 - Down-the-hole drill hammer. - Google Patents
Down-the-hole drill hammer. Download PDFInfo
- Publication number
- CA2470227A1 CA2470227A1 CA002470227A CA2470227A CA2470227A1 CA 2470227 A1 CA2470227 A1 CA 2470227A1 CA 002470227 A CA002470227 A CA 002470227A CA 2470227 A CA2470227 A CA 2470227A CA 2470227 A1 CA2470227 A1 CA 2470227A1
- Authority
- CA
- Canada
- Prior art keywords
- driver
- outer tube
- drill bit
- tube
- drill
- 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.)
- Abandoned
Links
- 239000000463 material Substances 0.000 claims description 9
- 229910000831 Steel Inorganic materials 0.000 claims description 5
- 239000010959 steel Substances 0.000 claims description 5
- 229910000906 Bronze Inorganic materials 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 229910000881 Cu alloy Inorganic materials 0.000 claims 1
- 238000005520 cutting process Methods 0.000 description 5
- 229910045601 alloy Inorganic materials 0.000 description 4
- 239000000956 alloy Substances 0.000 description 4
- 238000005553 drilling Methods 0.000 description 4
- 238000009527 percussion Methods 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000010974 bronze Substances 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
- E21B17/046—Couplings; joints between rod or the like and bit or between rod and rod or the like with ribs, pins, or jaws, and complementary grooves or the like, e.g. bayonet catches
-
- 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
- E21B4/20—Drives for drilling, used in the borehole combined with surface drive
Landscapes
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Fluid Mechanics (AREA)
- Environmental & Geological Engineering (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
- Percussive Tools And Related Accessories (AREA)
- Processing Of Stones Or Stones Resemblance Materials (AREA)
- Detergent Compositions (AREA)
- Dental Preparations (AREA)
- Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
Abstract
The present invention relates to an arrangement pertaining to down-the-hole hammers in which a driver (7) is adapted to transfer torsion forces between a rotating outer tube (10) and a drill bit (1) of the hammer, wherein the oute r tube (10) surrounds all of the driver (7).
Description
Down-the-Hole Drill Hammer The present invention relates to an arrangement pertaining to down-the-hole hammers.
In the case of down-the-hole hammers, rotational forces, feed, and percussion energy are transferred from a drilling unit to a down-the-hole hammer, which is lowered into the ~o hole to be drilled. The rotational forces are transmitted with the aid of a rotating outer tube, causing the drill bit to rotate, and the percussion forces are transmitted with the aid of a piston or ram that moves reciprocatingly in the tube in its longitudinal direction. The rotational force is trans-ferred from the outer tube by means of a chuck or driver screwed firmly into the outer tube. Arranged inside the driver or chuck is an array of splines which co-act with splines arranged on the outside of the bit shaft. The driver/chuck is thus seated in the connection between the 2o drill bit and the outer tube and the end of the driver/chuck facing towards the head of the drill bit has an outer diame-ter that corresponds roughly to the outer diameter of the outer tube and forms a direct extension thereof. The drilling bit, the outer tube and the driver or chuck are all made of 2s steel.
In an attempt to solve problems arising from the formation of cracks or fissures that can cause the shaft of the bit to break at the spline connection to the driver, it has been so proposed to replace the steel in the driver with a softer material, for instance with a bronze alloy. Unfortunately, this replacement has resulted in external wear and tear on the driver due to the backflow of cuttings along the outer surfaces of the drill bit, the driver and the outer tube.
Although such wear can be observed from without and a change to a new driver can be made when it is seen that said element has worn down to an extent that makes such a change neces-sary, the new driver will normally have a larger diameter than the worn outer tube, therewith resulting in greater turbulence around the new driver and accelerated wear on the outer tube.
~o Accordingly, an object of the invention is to provide a novel arrangement that enables these problems to be avoided.
This object is achieved with an arrangement pertaining to down-the-hole hammers in which a driver is adapted to trans-mit torsion forces between a rotating outer tube and a drill bit belonging to the down-the-hole hammer, wherein the outer tube is arranged to fully surround the outside of the driver, in accordance with the invention.
2o Total enclosure of the driver by the outer tube enables the driver to be made of a softer material without being sub-jected to external abrasion that would result in premature wear on the driver. Such external wear would only affect the outer tube, the material of which is considerably harder and 2s much more wear resistant than that from which the driver is made. Moreover, the outer tube can be given a surface coating which will make abrasive wear on the outer tube lower never-theless.
so The invention will now be described in more detail with ref-erence to an exemplifying embodiment and also with reference to the accompanying drawings, in which Figure 1 is a longitu-dinally sectioned view of a drill bit for a down-the-hole hammer and shows those parts that are in closest connection with the drill bit in accordance with known technology and Figure 2 is a corresponding longitudinally sectioned view of a drill bit for a down-the-hole hammer, showing those parts s that are in closest connection with the drill bit in accor-dance with the present invention.
Figure 1 thus shows a drill bit 1 that has rock drilling buttons 2 mounted on its front end in a known manner. Typi-~o tally, the drill bit 1 also includes a shaft 3 which is pro-vided with longitudinally extending splines 4 along a part of its length. The drill bit also has a rear end 5 against which a percussion piston is intended to strike. The drill bit 1 typically includes a longitudinally extending channel 6 15 through which compressed air is blown out from the front part of the drill to blow the drill cuttings away from the bit and out of the drill hole.
The shaft 3 carries a driver 7 which is provided internally 2o with longitudinally extending splines 8 that co-act with the splines 4. The driver 7 is generally in the form of a sleeve and is provided along at least part of its length with an external screw thread 9 by means of which the driver 7 can be screwed securely to the front end of an outer tube 10 that 25 surrounds at least a part of both the driver 7 and the shaft 3 of the drill bit 1. The outer tube 10 also surrounds the percussion piston 11. The drill hammer can be spliced or joined to allow the drill run to be extended to a desired length. The drilling unit causes the outer tube 10 to rotate, so wherewith the rotational movement of the tube is transmitted to the driver 7 which, in turn, transfers the rotational movement to the drill bit 1 through the medium of the spline connection 8, 4.
In the case of down-the-hole hammers, rotational forces, feed, and percussion energy are transferred from a drilling unit to a down-the-hole hammer, which is lowered into the ~o hole to be drilled. The rotational forces are transmitted with the aid of a rotating outer tube, causing the drill bit to rotate, and the percussion forces are transmitted with the aid of a piston or ram that moves reciprocatingly in the tube in its longitudinal direction. The rotational force is trans-ferred from the outer tube by means of a chuck or driver screwed firmly into the outer tube. Arranged inside the driver or chuck is an array of splines which co-act with splines arranged on the outside of the bit shaft. The driver/chuck is thus seated in the connection between the 2o drill bit and the outer tube and the end of the driver/chuck facing towards the head of the drill bit has an outer diame-ter that corresponds roughly to the outer diameter of the outer tube and forms a direct extension thereof. The drilling bit, the outer tube and the driver or chuck are all made of 2s steel.
In an attempt to solve problems arising from the formation of cracks or fissures that can cause the shaft of the bit to break at the spline connection to the driver, it has been so proposed to replace the steel in the driver with a softer material, for instance with a bronze alloy. Unfortunately, this replacement has resulted in external wear and tear on the driver due to the backflow of cuttings along the outer surfaces of the drill bit, the driver and the outer tube.
Although such wear can be observed from without and a change to a new driver can be made when it is seen that said element has worn down to an extent that makes such a change neces-sary, the new driver will normally have a larger diameter than the worn outer tube, therewith resulting in greater turbulence around the new driver and accelerated wear on the outer tube.
~o Accordingly, an object of the invention is to provide a novel arrangement that enables these problems to be avoided.
This object is achieved with an arrangement pertaining to down-the-hole hammers in which a driver is adapted to trans-mit torsion forces between a rotating outer tube and a drill bit belonging to the down-the-hole hammer, wherein the outer tube is arranged to fully surround the outside of the driver, in accordance with the invention.
2o Total enclosure of the driver by the outer tube enables the driver to be made of a softer material without being sub-jected to external abrasion that would result in premature wear on the driver. Such external wear would only affect the outer tube, the material of which is considerably harder and 2s much more wear resistant than that from which the driver is made. Moreover, the outer tube can be given a surface coating which will make abrasive wear on the outer tube lower never-theless.
so The invention will now be described in more detail with ref-erence to an exemplifying embodiment and also with reference to the accompanying drawings, in which Figure 1 is a longitu-dinally sectioned view of a drill bit for a down-the-hole hammer and shows those parts that are in closest connection with the drill bit in accordance with known technology and Figure 2 is a corresponding longitudinally sectioned view of a drill bit for a down-the-hole hammer, showing those parts s that are in closest connection with the drill bit in accor-dance with the present invention.
Figure 1 thus shows a drill bit 1 that has rock drilling buttons 2 mounted on its front end in a known manner. Typi-~o tally, the drill bit 1 also includes a shaft 3 which is pro-vided with longitudinally extending splines 4 along a part of its length. The drill bit also has a rear end 5 against which a percussion piston is intended to strike. The drill bit 1 typically includes a longitudinally extending channel 6 15 through which compressed air is blown out from the front part of the drill to blow the drill cuttings away from the bit and out of the drill hole.
The shaft 3 carries a driver 7 which is provided internally 2o with longitudinally extending splines 8 that co-act with the splines 4. The driver 7 is generally in the form of a sleeve and is provided along at least part of its length with an external screw thread 9 by means of which the driver 7 can be screwed securely to the front end of an outer tube 10 that 25 surrounds at least a part of both the driver 7 and the shaft 3 of the drill bit 1. The outer tube 10 also surrounds the percussion piston 11. The drill hammer can be spliced or joined to allow the drill run to be extended to a desired length. The drilling unit causes the outer tube 10 to rotate, so wherewith the rotational movement of the tube is transmitted to the driver 7 which, in turn, transfers the rotational movement to the drill bit 1 through the medium of the spline connection 8, 4.
As will be seen from Figure 1, the end part 12 of the driver 7 facing towards the head 13 of the drill bit 1 has an outer diameter which corresponds essentially to the outer diameter s of the outer tube 10 and constitutes an extension thereof.
Thus, it is this end part 12 of the driver 7 and the outer tube 10 that are strongly abraded by the externally flowing cuttings.
~o Figure 2 illustrate the inventive arrangement, in which the driver 7 is generally in the form of a cylindrical sleeve which is totally enclosed externally by the outer tube 10, so that in this case said tube will reach all the way to the bit head 13. The driver 7 is thus fully protected from the exter-~s nal affect of drill cuttings flowing back along the outside of the bit head and the outer tube. This allows the driver to be made of a much softer material than the material from which the drill bit 1 and its shaft 3 is made.
2o The driver will suitably be made of a material based on an alloy other than iron. The alloy will conveniently have a frictional coefficient of -< 0.25 in respect of a non-lubricated surface against steel, and a coefficient of ther-mal conductivity of >- 320 W/m K. Examples of alloys that ful-2s fil these requirements are alloys of bronze and copper.
As mentioned before, the outer tube 10 is preferably made of steel and may be provided with a harder outer coating to further reduce abrasive wear by the drill cuttings.
Thus, it is this end part 12 of the driver 7 and the outer tube 10 that are strongly abraded by the externally flowing cuttings.
~o Figure 2 illustrate the inventive arrangement, in which the driver 7 is generally in the form of a cylindrical sleeve which is totally enclosed externally by the outer tube 10, so that in this case said tube will reach all the way to the bit head 13. The driver 7 is thus fully protected from the exter-~s nal affect of drill cuttings flowing back along the outside of the bit head and the outer tube. This allows the driver to be made of a much softer material than the material from which the drill bit 1 and its shaft 3 is made.
2o The driver will suitably be made of a material based on an alloy other than iron. The alloy will conveniently have a frictional coefficient of -< 0.25 in respect of a non-lubricated surface against steel, and a coefficient of ther-mal conductivity of >- 320 W/m K. Examples of alloys that ful-2s fil these requirements are alloys of bronze and copper.
As mentioned before, the outer tube 10 is preferably made of steel and may be provided with a harder outer coating to further reduce abrasive wear by the drill cuttings.
Claims (4)
1. An arrangement pertaining to down-the-hole hammers in which a driver (7) is adapted to transfer torsion forces between a rotating outer tube (10) and a drill bit (1) of the hammer, characterised in that the outer tube (10) is made of steel and is arranged outwardly surrounding all of the driver (7), and that the driver is made of a softer material than that in the outer tube (10).
2. An arrangement according to Claim 1, characterised in that the driver (7) is made of a bronze alloy.
3. An arrangement according to Claim 2, characterised in that the driver (7) is made of a copper alloy.
4. An arrangement according to Claim 3, characterised in that the outer tube (10) has an outer coating that consists of a material which is harder than the material from which said tube (10) is chiefly comprised.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE0104377-7 | 2001-12-21 | ||
| SE0104377A SE523946C2 (en) | 2001-12-21 | 2001-12-21 | Lowering drill hammer where the outer tube completely encloses a carrier |
| PCT/SE2002/002276 WO2003062586A1 (en) | 2001-12-21 | 2002-12-10 | Down-the-hole drill hammer. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2470227A1 true CA2470227A1 (en) | 2003-07-31 |
Family
ID=20286475
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002470227A Abandoned CA2470227A1 (en) | 2001-12-21 | 2002-12-10 | Down-the-hole drill hammer. |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US20050045385A1 (en) |
| EP (1) | EP1463868B1 (en) |
| AT (1) | ATE370305T1 (en) |
| CA (1) | CA2470227A1 (en) |
| DE (1) | DE60221899T2 (en) |
| ES (1) | ES2291520T3 (en) |
| SE (1) | SE523946C2 (en) |
| WO (1) | WO2003062586A1 (en) |
| ZA (1) | ZA200404801B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE524153C2 (en) * | 2001-12-21 | 2004-07-06 | Atlas Copco Secoroc Ab | Carriers for submersible hammer made of material softer than the material of the shaft |
| IES20060005A2 (en) | 2006-01-04 | 2007-02-21 | Minroc Techn Promotions Ltd | A drill bit assembly for fluid-operated percussion drill tools |
| US7900716B2 (en) * | 2008-01-04 | 2011-03-08 | Longyear Tm, Inc. | Vibratory unit for drilling systems |
| IES20090701A2 (en) | 2009-08-31 | 2010-05-12 | Minroc Techn Promotions Ltd | A drill bit assembly for fluid-operated percussion drill tools |
| US20110180330A1 (en) * | 2010-01-26 | 2011-07-28 | Conn Timothy W | Drilling assembly with underreaming bit and method of use |
| WO2011129958A2 (en) * | 2010-04-16 | 2011-10-20 | Wvc Mincon Inc. | Reverse circulation hammer with modular bit |
| IES20100666A2 (en) | 2010-10-15 | 2011-06-22 | Minroc Techn Promotions Ltd | A down-the-hole hammer |
Family Cites Families (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3193024A (en) * | 1962-01-18 | 1965-07-06 | Atlantic Refining Co | Percussion drills with exhaust passage in hammer |
| US4173457A (en) * | 1978-03-23 | 1979-11-06 | Alloys, Incorporated | Hardfacing composition of nickel-bonded sintered chromium carbide particles and tools hardfaced thereof |
| DE2854461C2 (en) * | 1978-12-16 | 1983-03-10 | Wirth Maschinen- und Bohrgeräte-Fabrik GmbH, 5140 Erkelenz | Countersink hammer |
| ZA863192B (en) * | 1986-04-29 | 1986-12-30 | Abraham Gien | Improvement in valveless pneumatic hammer |
| US4402370A (en) * | 1981-05-15 | 1983-09-06 | Abraham Gein | Valveless pneumatic hammer |
| US4706764A (en) * | 1986-08-01 | 1987-11-17 | Ingersoll-Rand Company | Two piece down hole drill chuck |
| USRE36002E (en) * | 1990-04-26 | 1998-12-22 | Sds Digger Tools Pty, Ltd. | Transmission sleeve for a down hole hammer |
| US5065827A (en) * | 1990-12-21 | 1991-11-19 | Smith International, Inc. | Hammer bit retention tool |
| DE4200580A1 (en) * | 1991-09-13 | 1993-03-18 | Hausherr & Soehne Rudolf | STONE DRILL BIT |
| SE505170C2 (en) * | 1993-12-13 | 1997-07-07 | G Drill Ab | Lowering drill with compressible spacer |
| US5685380A (en) * | 1995-01-06 | 1997-11-11 | Minroc Technical Promotions Limited | Reverse circulation down-the-hole drill |
| US5647447A (en) * | 1996-06-10 | 1997-07-15 | Ingersoll-Rand Company | Bit retention device for a bit and chuck assembly of a down-the-hole percussive drill |
| US6070678A (en) * | 1998-05-01 | 2000-06-06 | Numa Tool Company | Bit retention system |
| US7395883B2 (en) * | 2005-12-15 | 2008-07-08 | Rockmore International, Inc. | Keyed connection for drill bit |
-
2001
- 2001-12-21 SE SE0104377A patent/SE523946C2/en not_active IP Right Cessation
-
2002
- 2002-12-10 ES ES02786339T patent/ES2291520T3/en not_active Expired - Lifetime
- 2002-12-10 WO PCT/SE2002/002276 patent/WO2003062586A1/en active IP Right Grant
- 2002-12-10 DE DE60221899T patent/DE60221899T2/en not_active Expired - Fee Related
- 2002-12-10 AT AT02786339T patent/ATE370305T1/en not_active IP Right Cessation
- 2002-12-10 EP EP02786339A patent/EP1463868B1/en not_active Expired - Lifetime
- 2002-12-10 US US10/499,150 patent/US20050045385A1/en not_active Abandoned
- 2002-12-10 CA CA002470227A patent/CA2470227A1/en not_active Abandoned
-
2004
- 2004-06-17 ZA ZA200404801A patent/ZA200404801B/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| EP1463868A1 (en) | 2004-10-06 |
| SE523946C2 (en) | 2004-06-08 |
| WO2003062586A1 (en) | 2003-07-31 |
| SE0104377L (en) | 2003-06-22 |
| US20050045385A1 (en) | 2005-03-03 |
| DE60221899D1 (en) | 2007-09-27 |
| SE0104377D0 (en) | 2001-12-21 |
| ATE370305T1 (en) | 2007-09-15 |
| ZA200404801B (en) | 2005-08-29 |
| ES2291520T3 (en) | 2008-03-01 |
| DE60221899T2 (en) | 2008-03-13 |
| EP1463868B1 (en) | 2007-08-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP1926881B1 (en) | A percussion hammer for enlarging drilled holes | |
| US7975784B2 (en) | Drill bit assembly for fluid-operated percussion drill tools | |
| JPS6344096A (en) | Two-piece chuck for striking type rock drill | |
| EP3655614B1 (en) | Drill bit with detachable bit head | |
| EP1463868B1 (en) | Down-the-hole drill hammer. | |
| WO1995034740A1 (en) | Drilling apparatus | |
| CN113631793B (en) | Rock drill bit for percussive drilling | |
| CN111395951A (en) | Heavy-calibre reverse circulation impact system | |
| EP1463869B1 (en) | Driver | |
| AU2002349858A1 (en) | Down-the-hole drill hammer. | |
| CA2036883C (en) | Drill head with integral impact hammers | |
| CN212225095U (en) | Heavy-calibre reverse circulation impact system | |
| AU2002359108A1 (en) | Driver | |
| US7128172B2 (en) | Drill string for upward drilling and components therefor | |
| CA2463258A1 (en) | Down-the-hole drill hammer | |
| JPH0913860A (en) | Down-the-hall drill | |
| IE20050621U1 (en) | A percussion hammer for enlarging drilled holes | |
| IES84417Y1 (en) | A percussion hammer for enlarging drilled holes | |
| AU2002339225A1 (en) | Down-the-hole drill hammer | |
| ZA200403540B (en) | Down the hole drill hammer | |
| IES84499Y1 (en) | A drill bit assembly for fluid-operated percussion drill tools |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Discontinued |