ZA200403670B - Method of rock drilling. - Google Patents
Method of rock drilling. Download PDFInfo
- Publication number
- ZA200403670B ZA200403670B ZA200403670A ZA200403670A ZA200403670B ZA 200403670 B ZA200403670 B ZA 200403670B ZA 200403670 A ZA200403670 A ZA 200403670A ZA 200403670 A ZA200403670 A ZA 200403670A ZA 200403670 B ZA200403670 B ZA 200403670B
- Authority
- ZA
- South Africa
- Prior art keywords
- rock
- pressure
- rock drilling
- drilling machine
- feed
- Prior art date
Links
- 239000011435 rock Substances 0.000 title claims abstract description 59
- 238000005553 drilling Methods 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 12
- 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
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
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
Method of rock drilling comprising forward feeding of a rock drilling machine (3) toward 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, whereby the pressure in a recoil damper (21) at the rock drilling machine (3) is read and stored in a memory (44), that the rock drilling machine (3) is fed toward the rock (33) with rotation and impact device inactive until a rock drilling tool (2) connected to the 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.
Description
Method of rock drilling
A
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 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 emty 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 emty 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. 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 i 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 ackumulator 6 which is supplied with pressure liquid from a pressure liquid sourse 16 via a control device 26 and a conduit 22. Piston 8 is with close fit insertable into a second 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 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. 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 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. the 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 : contolling 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.
Then 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. After that the rock drilling machine is backed a short distance so that the drill 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 in memory 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.
Conversion: 1 bar=1x 10° Pa
AMENDED SHEET DATED 19 JULY 2005
Claims (3)
1. Method of rock drilling comprising forward feeding of a rock drilling machine toward a rock, drilling a short distance in the rock with reduced values on impact pressure and feed pressure and after that transition to full impact pressure and feed pressure with which a bore hole is finished, characterized in that the pressure in a recoil damper at the rock drilling machine is read and stored in a memory, that the rock drilling machine is fed toward the rock with inactive impact device until a rock drilling tool connected to the rock drilling machine reaches the rock, that the feeding toward the rock is interrupted when the pressure in the recoil damper exceeds the value stored in the memory with a predetermined amount and that the bore hole after that is drilled with impact device and feeding active.
2. Method according to claim 1, characterize din that the position of the rock drilling machine along a feed beam is stored in the memory at rock contact, that the rock drilling machine is backed a short distance and that a bore hole after that is drilled.
3. - Method of rock drilling substantially as herein described with reference to the illustrated embodiment. AMENDED SHEET DATED 19 JULY 2005
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE0103880A SE520421C2 (en) | 2001-11-22 | 2001-11-22 | Procedure for rock drilling |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| ZA200403670B true ZA200403670B (en) | 2005-07-27 |
Family
ID=20286059
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| ZA200403670A ZA200403670B (en) | 2001-11-22 | 2004-05-13 | 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 AU AU2002347731A patent/AU2002347731B2/en not_active Expired
- 2002-11-07 CA CA2467818A patent/CA2467818C/en not_active Expired - Lifetime
- 2002-11-07 DE DE60215689T patent/DE60215689T2/en not_active Expired - Lifetime
- 2002-11-07 ES ES02783930T patent/ES2275013T3/en not_active Expired - Lifetime
- 2002-11-07 PT PT02783930T patent/PT1446554E/en unknown
- 2002-11-07 WO PCT/SE2002/002028 patent/WO2003044319A1/en active IP Right Grant
- 2002-11-07 EP EP02783930A patent/EP1446554B1/en not_active Expired - Lifetime
- 2002-11-07 AT AT02783930T patent/ATE343707T1/en active
-
2004
- 2004-05-13 ZA ZA200403670A patent/ZA200403670B/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| PT1446554E (en) | 2007-02-28 |
| CA2467818C (en) | 2010-04-27 |
| CA2467818A1 (en) | 2003-05-30 |
| ES2275013T3 (en) | 2007-06-01 |
| EP1446554B1 (en) | 2006-10-25 |
| AU2002347731A1 (en) | 2003-06-10 |
| EP1446554A1 (en) | 2004-08-18 |
| SE0103880L (en) | 2003-05-23 |
| WO2003044319A1 (en) | 2003-05-30 |
| ATE343707T1 (en) | 2006-11-15 |
| DE60215689D1 (en) | 2006-12-07 |
| DE60215689T2 (en) | 2007-05-10 |
| SE520421C2 (en) | 2003-07-08 |
| AU2002347731B2 (en) | 2006-11-02 |
| SE0103880D0 (en) | 2001-11-22 |
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