EP1446554A1 - Method of rock drilling - Google Patents

Method of rock drilling

Info

Publication number
EP1446554A1
EP1446554A1 EP02783930A EP02783930A EP1446554A1 EP 1446554 A1 EP1446554 A1 EP 1446554A1 EP 02783930 A EP02783930 A EP 02783930A EP 02783930 A EP02783930 A EP 02783930A EP 1446554 A1 EP1446554 A1 EP 1446554A1
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.)
Granted
Application number
EP02783930A
Other languages
German (de)
French (fr)
Other versions
EP1446554B1 (en
Inventor
Kurt Andersson
Magnus Olsson
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.)
Epiroc Rock Drills AB
Original Assignee
Atlas Copco Rock Drills AB
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=20286059&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP1446554(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Atlas Copco Rock Drills AB filed Critical Atlas Copco Rock Drills AB
Publication of EP1446554A1 publication Critical patent/EP1446554A1/en
Application granted granted Critical
Publication of EP1446554B1 publication Critical patent/EP1446554B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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.
  • 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.
  • 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 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.
  • 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 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.
  • 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.
  • valve 39 Through decreasing the damper flow by valve 39 one can obtain detection of rock contact at a smaller pressure increase than otherwise.
  • 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.

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
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 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.

Claims

Claims:
1. 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, characterized in that 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 inactive impact device 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 with impact device and feeding active.
2. 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 rock drilling machine (3) is backed a short distance and that a bore hole after that is drilled.
EP02783930A 2001-11-22 2002-11-07 Method of rock drilling Expired - Lifetime EP1446554B1 (en)

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 true EP1446554A1 (en) 2004-08-18
EP1446554B1 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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO03044319A1 *

Also Published As

Publication number Publication date
CA2467818A1 (en) 2003-05-30
WO2003044319A1 (en) 2003-05-30
EP1446554B1 (en) 2006-10-25
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
SE520421C2 (en) 2003-07-08

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