EP1446554B1 - Method of rock drilling - Google Patents
Method of rock drilling Download PDFInfo
- Publication number
- EP1446554B1 EP1446554B1 EP02783930A EP02783930A EP1446554B1 EP 1446554 B1 EP1446554 B1 EP 1446554B1 EP 02783930 A EP02783930 A EP 02783930A EP 02783930 A EP02783930 A EP 02783930A EP 1446554 B1 EP1446554 B1 EP 1446554B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- rock
- pressure
- rock drilling
- drilling machine
- feed
- 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
Links
- 239000011435 rock Substances 0.000 title claims abstract description 58
- 238000005553 drilling Methods 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 11
- 230000007704 transition Effects 0.000 claims abstract 2
- 239000007788 liquid Substances 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 238000011010 flushing procedure Methods 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
Images
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
- E21B44/00—Automatic control systems specially adapted for drilling operations, i.e. self-operating systems which function to carry out or modify a drilling operation without intervention of a human operator, e.g. computer-controlled drilling systems; Systems specially adapted for monitoring a plurality of drilling variables or conditions
Definitions
- the present invention relates to a method of rock drilling. More specifically the invention relates to a method where the impact device is activated only after rock contact has been achieved.
- the present invention which is defined in the subsequent claims, aims at achieving a method of rock drilling where the forward feed of the rock drilling machine to rock contact can occur much quicker without exerting the equipment to unnecessary and harmful empty blows.
- fig 1 schematically shows a rock drilling machine.
- Fig 2 shows schematically a control system for the rock drilling machine.
- the rock drilling device shown in fig 1 comprises a machine housing 3 on which a front part 11 is fastened.
- the drilling device comprises a drill string including a set of tubes 1, which in fig 1 is represented by the drill sleeve 1 which is the rear part, and a set of rods 2, which in fig 1 is represented by an adapter 2 arranged in the machine.
- a drill bit 31 is arranged in the front part of the drill string.
- the drill bit 31 is rotated by means of the set of tubes which is rotated by a rotation motor 12 via a gear wheel 13 which meshes with cogs 14 on the drill sleeve 1.
- a hammer piston 4 is movable to-and-fro in the machine housing 3 in the usual way.
- the hammer piston transfers its energy to the adapter 2 in the set of rods. This energy is then transferred from rod to rod in the set of rods and from the set of rods to the drill bit 31.
- a sleeve 15 and a piston 8 are slidably arranged in the machine housing 3. These transfer a force determined by the pressure in a first chamber 5 to the adapter 2. This pressure acts forward on a surface 17. This force is during drilling used to hold the rods in the set of rods together.
- Chamber 5 is connected to an accumulator 6 which is supplied with pressure liquid from a pressure liquid source 16 via a control device 26 and a conduit 22. Piston 8 is with close fit insertable into a second chamber 7.
- a check valve 9 is arranged between the first and second chambers and directed such that liquid flow is allowed from the first chamber 5 to the second chamber 7. Chambers 5 and 7 together form a recoil damper 21.
- the rock drilling machine is in the usual way movable to-and-fro along a feed beam 32 by a not shown feed motor.
- the drill tool comprises a set of tubes and a set of rods arranged therein.
- the drill tool can of course be a drill rod of the normal kind.
- the control system for the rock drilling method shown in fig 2 comprises a control unit 34 provided with a memory 44 for storing drilling values. To the control unit 34 are connected a sensor 35 for the pressure in the recoil damper 21, a sensor 36 for the pressure in the not shown feed motor which moves the rock drilling machine 3 along the feed beam 32, a sensor 37 for the pressure to the rotation motor 12 and a sensor for the pressure which drives the hammer piston 4 to-and-fro, the impact pressure.
- the control unit 34 is arranged to control a number of valves, e.g.
- valve 39 for reducing the flow through the recoil damper 21, the valve 40 which controls the flow to the feed motor, the valve 41 which controls the pressure to the feed motor, the valve 42 which controls the flow through the rotation motor and the valve 43 which controls the pressure to the impact device for controlling the to-and-fro movement of the hammer piston 4.
- the method of rock drilling is performed in the following way with the shown rock drilling device.
- the pressure in the recoil damper 21 is read by the sensor 35 and stored in memory 44 in the control unit 34. This is the idle damper pressure which is used as reference value.
- the rock drilling machine 3 is fed along the feed beam 32 toward the rock 33 through opening the valves 40 for feed flow and 41 for feed pressure somewhat by the control unit 34. No other functions are activated at this time. The essential thing is however that the impact device remains inactive during this feed movement. Rotation may occur during this forward feed toward the rock. In this condition the reaching of the rock 33 by the drill bit 31 is awaited.
- the feeding toward the rock is interrupted when the pressure in the recoil damper 21 exceeds the reference value with a predetermined amount, for instance 10 bar. Through decreasing the damper flow by valve 39 one can obtain detection of rock contact at a smaller pressure increase than otherwise. When rock contact is detected the position of the rock drilling machine along the feed beam 32 is stored in the memory 44.
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
Abstract
Description
- The present invention relates to a method of rock drilling. More specifically the invention relates to a method where the impact device is activated only after rock contact has been achieved.
- According to previously known technique drilling (see EP-A-0 648 915) is initiated through starting of rotation of the rock drilling tool and flushing. After that the impact device is started with collaring pressure and the rock drilling machine is fed forward toward the rock with low speed. When the rock drilling tool reaches the rock drilling starts with low values on impact pressure and feed pressure. In order to get good collaring the forward feed must occur with low speed which means that it takes comparatively long time and that the drilling tool is exerted to empty blows, with resulting risks for damage, during this time. Since detection of rock contact occurs through sensing of the feed pressure difficulties with safe detection arise because of friction between the rock drilling machine slide and the feed beam.
- The present invention, which is defined in the subsequent claims, aims at achieving a method of rock drilling where the forward feed of the rock drilling machine to rock contact can occur much quicker without exerting the equipment to unnecessary and harmful empty blows.
- An embodiment of the invention is described below with reference to the accompanying drawing in which fig 1 schematically shows a rock drilling machine. Fig 2 shows schematically a control system for the rock drilling machine.
- The rock drilling device shown in fig 1 comprises a machine housing 3 on which a front part 11 is fastened. The drilling device comprises a drill string including a set of tubes 1, which in fig 1 is represented by the drill sleeve 1 which is the rear part, and a set of rods 2, which in fig 1 is represented by an adapter 2 arranged in the machine. In the front part of the drill string a
drill bit 31 is arranged. Thedrill bit 31 is rotated by means of the set of tubes which is rotated by arotation motor 12 via agear wheel 13 which meshes withcogs 14 on the drill sleeve 1. Ahammer piston 4 is movable to-and-fro in the machine housing 3 in the usual way. The hammer piston transfers its energy to the adapter 2 in the set of rods. This energy is then transferred from rod to rod in the set of rods and from the set of rods to thedrill bit 31. Asleeve 15 and a piston 8 are slidably arranged in the machine housing 3. These transfer a force determined by the pressure in a first chamber 5 to the adapter 2. This pressure acts forward on asurface 17. This force is during drilling used to hold the rods in the set of rods together. Chamber 5 is connected to an accumulator 6 which is supplied with pressure liquid from a pressureliquid source 16 via acontrol device 26 and aconduit 22. Piston 8 is with close fit insertable into asecond chamber 7. This means that the recoil from the rock is effectively dampened because liquid is pressed out through the narrow slot between piston 8 and the machine housing. In order to avoid cavitation when piston 8 moves out from chamber 7 a check valve 9 is arranged between the first and second chambers and directed such that liquid flow is allowed from the first chamber 5 to thesecond chamber 7.Chambers 5 and 7 together form arecoil damper 21. The rock drilling machine is in the usual way movable to-and-fro along afeed beam 32 by a not shown feed motor. In the shown example the drill tool comprises a set of tubes and a set of rods arranged therein. The drill tool can of course be a drill rod of the normal kind. - The control system for the rock drilling method shown in fig 2 comprises a
control unit 34 provided with amemory 44 for storing drilling values. To thecontrol unit 34 are connected asensor 35 for the pressure in therecoil damper 21, a sensor 36 for the pressure in the not shown feed motor which moves the rock drilling machine 3 along thefeed beam 32, asensor 37 for the pressure to therotation motor 12 and a sensor for the pressure which drives thehammer piston 4 to-and-fro, the impact pressure. Thecontrol unit 34 is arranged to control a number of valves, e.g. the valve 39 for reducing the flow through therecoil damper 21, thevalve 40 which controls the flow to the feed motor, thevalve 41 which controls the pressure to the feed motor, thevalve 42 which controls the flow through the rotation motor and thevalve 43 which controls the pressure to the impact device for controlling the to-and-fro movement of thehammer piston 4. - The method of rock drilling is performed in the following way with the shown rock drilling device. The pressure in the
recoil damper 21 is read by thesensor 35 and stored inmemory 44 in thecontrol unit 34. This is the idle damper pressure which is used as reference value. - Then the rock drilling machine 3 is fed along the
feed beam 32 toward therock 33 through opening thevalves 40 for feed flow and 41 for feed pressure somewhat by thecontrol unit 34. No other functions are activated at this time. The essential thing is however that the impact device remains inactive during this feed movement. Rotation may occur during this forward feed toward the rock. In this condition the reaching of therock 33 by thedrill bit 31 is awaited. The feeding toward the rock is interrupted when the pressure in therecoil damper 21 exceeds the reference value with a predetermined amount, for instance 10 bar. Through decreasing the damper flow by valve 39 one can obtain detection of rock contact at a smaller pressure increase than otherwise. When rock contact is detected the position of the rock drilling machine along thefeed beam 32 is stored in thememory 44. After that the rock drilling machine is backed a short distance so that thedrill bit 31 is free from the rock. Rotation and flushing are activated. Valves 40, 41 and 42 are opened so that the impact device is activated with low pressure, collaring pressure, and feed forward is started with low speed. This drilling occurs a short distance in front of the position stored inmemory 44. After that impact pressure and feed pressure are increased during a certain time to those values which are used for normal drilling. Then the hole is drilled completely.
Claims (3)
- Method of rock drilling comprising forward feeding of a percussive rock drilling machine (3) provided with a recoil damper (21) towards a rock (33), drilling a short distance in the rock with reduced values on impact pressure (38) and feed pressure (36) and after that transition to full impact pressure and feed pressure with which a bore hole is finished, characterized in that the pressure in the recoil damper (21) at the percussive rock drilling machine (3) is read and stored in a memory (44), that the percussive rock drilling machine (3) is fed towards the rock (33) with inactive impact device until a rock drilling tool (2) connected to the percussive rock drilling machine reaches the rock, that the feeding toward the rock is interrupted when the pressure (35) in the recoil damper (21) exceeds the value stored in the memory (44) with a predetermined amount and that the bore hole after that is drilled with impact device and feeding active.
- Method according to claim 1, characterized in that the position of the rock drilling machine (3) along a feed beam (32) is stored in the memory (44) at rock contact, that the percussive rock drilling machine (3) is backed a short distance and that a bore hole is drilled after that.
- A percussive rock drilling machine arranged to perform the method according to claim 1 or 2.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE0103880 | 2001-11-22 | ||
SE0103880A SE520421C2 (en) | 2001-11-22 | 2001-11-22 | Procedure for rock drilling |
PCT/SE2002/002028 WO2003044319A1 (en) | 2001-11-22 | 2002-11-07 | Method of rock drilling |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1446554A1 EP1446554A1 (en) | 2004-08-18 |
EP1446554B1 true EP1446554B1 (en) | 2006-10-25 |
Family
ID=20286059
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02783930A Expired - Lifetime EP1446554B1 (en) | 2001-11-22 | 2002-11-07 | Method of rock drilling |
Country Status (10)
Country | Link |
---|---|
EP (1) | EP1446554B1 (en) |
AT (1) | ATE343707T1 (en) |
AU (1) | AU2002347731B2 (en) |
CA (1) | CA2467818C (en) |
DE (1) | DE60215689T2 (en) |
ES (1) | ES2275013T3 (en) |
PT (1) | PT1446554E (en) |
SE (1) | SE520421C2 (en) |
WO (1) | WO2003044319A1 (en) |
ZA (1) | ZA200403670B (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE529230C2 (en) | 2004-12-10 | 2007-06-05 | Atlas Copco Rock Drills Ab | Device and method of drilling in rock |
SE532464C2 (en) * | 2007-04-11 | 2010-01-26 | Atlas Copco Rock Drills Ab | Method, apparatus and rock drilling rig for controlling at least one drilling parameter |
SE532482C2 (en) * | 2007-04-11 | 2010-02-02 | Atlas Copco Rock Drills Ab | Method, apparatus and rock drilling rig for controlling at least one drilling parameter |
EP3260647B1 (en) * | 2016-06-22 | 2019-08-07 | Sandvik Mining and Construction Oy | Rock drill |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3561542A (en) * | 1969-03-20 | 1971-02-09 | Gardner Denver Co | Control system for rock drills |
FR2250014A1 (en) * | 1973-11-07 | 1975-05-30 | Secoma | |
SE463193B (en) * | 1989-02-21 | 1990-10-22 | Atlas Copco Mct Ab | DEVICE WITH BATTERY MACHINERY |
SE508064C2 (en) * | 1993-10-15 | 1998-08-17 | Atlas Copco Rock Drills Ab | Rock drilling device with reflex damper |
-
2001
- 2001-11-22 SE SE0103880A patent/SE520421C2/en not_active IP Right Cessation
-
2002
- 2002-11-07 ES ES02783930T patent/ES2275013T3/en not_active Expired - Lifetime
- 2002-11-07 AT AT02783930T patent/ATE343707T1/en active
- 2002-11-07 EP EP02783930A patent/EP1446554B1/en not_active Expired - Lifetime
- 2002-11-07 WO PCT/SE2002/002028 patent/WO2003044319A1/en active IP Right Grant
- 2002-11-07 DE DE60215689T patent/DE60215689T2/en not_active Expired - Lifetime
- 2002-11-07 CA CA2467818A patent/CA2467818C/en not_active Expired - Lifetime
- 2002-11-07 AU AU2002347731A patent/AU2002347731B2/en not_active Expired
- 2002-11-07 PT PT02783930T patent/PT1446554E/en unknown
-
2004
- 2004-05-13 ZA ZA200403670A patent/ZA200403670B/en unknown
Also Published As
Publication number | Publication date |
---|---|
CA2467818A1 (en) | 2003-05-30 |
WO2003044319A1 (en) | 2003-05-30 |
SE0103880L (en) | 2003-05-23 |
AU2002347731A1 (en) | 2003-06-10 |
PT1446554E (en) | 2007-02-28 |
ES2275013T3 (en) | 2007-06-01 |
ZA200403670B (en) | 2005-07-27 |
DE60215689T2 (en) | 2007-05-10 |
CA2467818C (en) | 2010-04-27 |
SE0103880D0 (en) | 2001-11-22 |
DE60215689D1 (en) | 2006-12-07 |
ATE343707T1 (en) | 2006-11-15 |
AU2002347731B2 (en) | 2006-11-02 |
EP1446554A1 (en) | 2004-08-18 |
SE520421C2 (en) | 2003-07-08 |
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