WO2007123460A1 - Dispositif de forage de roche - Google Patents

Dispositif de forage de roche Download PDF

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Publication number
WO2007123460A1
WO2007123460A1 PCT/SE2007/000367 SE2007000367W WO2007123460A1 WO 2007123460 A1 WO2007123460 A1 WO 2007123460A1 SE 2007000367 W SE2007000367 W SE 2007000367W WO 2007123460 A1 WO2007123460 A1 WO 2007123460A1
Authority
WO
WIPO (PCT)
Prior art keywords
jaw
cylinder
piston
drill string
piston unit
Prior art date
Application number
PCT/SE2007/000367
Other languages
English (en)
Inventor
Jonas ORGÅRD
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
Application filed by Atlas Copco Rock Drills Ab filed Critical Atlas Copco Rock Drills Ab
Priority to EP07748032A priority Critical patent/EP2010749A1/fr
Priority to AU2007241585A priority patent/AU2007241585B2/en
Priority to CA2644582A priority patent/CA2644582C/fr
Publication of WO2007123460A1 publication Critical patent/WO2007123460A1/fr

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
    • E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
    • E21B19/24—Guiding or centralising devices for drilling rods or pipes

Definitions

  • the invention concerns a drill string guide device according to the preamble of claim 1.
  • the invention also concerns a rock drilling device including such a drill string guide device.
  • drill string guide devices are used, whereof a known drill string guide device is attached at the distal end of a feed beam and assists during directing the drill string in order to achieve enhanced collaring and increased straightness of the hole.
  • US-B2-6 860 343 describes a pair of grip tongs for mounting on a support for clamping action against a drill string.
  • a first and a second jaw are manoeuvrable with the aid of a fluid cylinder device to a position where they are in engagement with, and a position where they release a drill string.
  • the device is provided with an arrangement with floating suspension on a support, which has a fixed distance to the centre of the drill string and thus to the jaws when they are pressed against each other, as well as when they are pressed from each other.
  • the jaws are controlled for movement on a set of guide axes.
  • drill string guides consist of many mutually movable parts which are subjected to wear.
  • the wear is considerable because of the very abrasive environment, which often prevails where the drill string guides is used. Worn parts result in turn in deteriorated guiding of the drill string and thereby deteriorated hole linearity.
  • the wear also results in shortened service intervals and even unplanned production breaks. Because the drill string guide is one of the components on a drill rig which is most subjected to wear, it is important for the productivity and accuracy of the entire drill rig to have this component well functioning.
  • the invention makes it possible to construct the drill string guide device with large bearing surfaces, and this together with minimized number of movable parts, results in that the working lift will be longer than in respect of known drill string guide devices. In particular, this is true in a position for guiding of the drill string during rock drilling in progress, wherein the jaws are moved inwardly a smaller distance than in the engagement position itself.
  • a consequence of the invention is that only two slits between movable parts have to be sealed, namely between the housing and the first piston unit and between the first and the second piston unit. Protection for these slits can be obtained by means of well-known, simple and effective means. This also contributes to an increased working life of the device .
  • the first piston unit is guided in the first cylinder with the aid of bearing means for taking up sideward forces occurring on the first jaw.
  • a piston rod means being part of the piston unit, at its exit from the cylinder through the housing, is supported by suitable bearing surfaces such as bearing rings or the like.
  • the force for positioning the jaw package can be set relatively small and in reality independent of the clamping force.
  • the first jaw having an inwardly curved, shallow, U- shaped engagement surface, adaptation to the outside dimensions of a drill string to be gripped by the device is allowed.
  • the engagement surface has portions with two different radiuses of curvature, for engagement on differently sized objects, as for example on the one hand the drill string itself, on the other hand a joining sleeve between two drill string units.
  • the piston rod chamber in the first cylinder and the end wall chamber of the second cylinder are preferably possible to pressurize simultaneously, for initiating of said engagement position, by being interconnected through a channel.
  • piston rod chamber of the second cylinder and the end wall chamber of the first cylinder can preferably be pressurized simultaneously, for initiating of said releasing position, by being interconnected through a channel.
  • a guide unit for a drill string including a fix guide sleeve which is aligned with the jaws is arranged on the housing, preferably distally with respect to it, that is in the drilling direction, guiding of the drill string during drilling is obtained and it is avoided that the jaws and the associated piston units are subjected to stressing shocks.
  • the guide unit is positioned such that a rotation preventing portion controls the first jaw against undesired rotation around an axis through the first piston unit.
  • the invention also concerns a rock drilling machine including a drill string guide device according to the above.
  • Fig. 1 shows a drill string guide device in a perspective view
  • Fig. 2 shows an axial section through the drill string guide device according to Fig. 1,
  • Fig. 3 shows diagrammatically a rock drilling device including a drill string guide device according to the invention
  • Figs 4a and b show the drill string guide device with the jaws in different positions.
  • a drill string guide device 1 including a gripping unit 2 for engagement with and releasing, respectively, a drill string which extends (not shown) through the drill string guide device.
  • a guide unit 3 Distally of the drill string guide device, that is in the drilling direction as seen in respect of the gripping unit 2, is attached a guide unit 3, which has guiding means in order to control, to a certain extent, the position of a drill string during drilling.
  • the gripping unit 2 includes a jaw ring 4, which is supported movably with respect of a housing 6 of the drill string guide device 1.
  • a fastening surface indicated with 5 has on a flanged portion through-holes F for receiving screws, which are intended to be screw-fastened into the end area of a feed-beam of a drill rig.
  • Pi - P 4 indicate inlet/outlet ports of channels, which are drawn to a fluid cylinder device in a manner which is explained below. According to the shown embodiment, only two of these ports have to be used in operation. With a "fluid cylinder" is intended a cylinder which is manoeuvrable with gas as well as liquid under pressure .
  • the grip unit 2 inside the jaw ring 4 includes a first jaw 7 and a second jaw 8 which are arranged to be moved towards each other for engagement with, and from each other for release of, a drill string.
  • the jaw ring 4 is, via screws 12, carried by a first piston unit 9 which includes a first piston 10 and first piston rod means 11.
  • the first piston unit 9 is movable up and down, as seen in the figure, inside a first cylinder 13, after pressurizing of a first end wall chamber 19 and a first piston rod chamber 20, respectively.
  • Pressurizing of the first end wall chamber 19 moves the first jaw from a drill string position, for releasing action and pressurizing of the first piston rod chamber 20 results in pulling down the first jaw 7 for engagement with said drill string.
  • the second jaw 8 is directly carried by a second piston unit 14 which includes a second piston 15 and second piston rod means 16.
  • the second piston 15 is movable inside a second cylinder 35, which in the shown embodiment as a whole is received inside the first piston unit 9. Pressurizing a second end wall chamber 21, results in pressing out the second jaw 8 and a gripping action against the drill string, whereas pressurizing a second piston rod chamber 22, results in pulling in of the second jaw 8 and releasing the drill string.
  • the stroke of the second piston is shown a little more than twice as great as the stroke of the first piston, i.a. in order to compensate for jaw wear and because of the second one being carried by the first one respectively.
  • the drawing of channels is such in the shown embodiment, that the first end wall chamber 19 and the second piston rod chamber 22 are possible to pressurize simultaneously through a second pressurizing channel 24, such that said releasing position is obtained, that is the position which is shown on Fig. 2.
  • a second pressurizing channel 24 Through the first piston rod means 11, in the area of the second piston rod chamber 22, is arranged through-going channel means 25 in order to let in pressure medium from the second pressurizing channel 24 to the second piston rod chamber 22.
  • Pressure in the chamber 21 creates a clamping force between the pistons.
  • Pressure at 20 positions the force couple .
  • the second end wall chamber 21 When pressurizing the first piston rod chamber over a first pressurizing channel 23, the second end wall chamber 21 will be pressurized simultaneously over through-going channel means 26 through the first piston rod means 11, which will press down the first piston unit with the first jaw and at the same time press out the second piston unit with the second jaw for engagement with a drill string.
  • the first cylinder 13 is sealed by a first cylinder end wall 17 and the second cylinder by a second cylinder end wall 18.
  • the housing is made rigid so as to take up side forces from the jaws in operation of the device.
  • the respective piston rod side through-holes from the respective cylinders have bearing means in the form of bearing rings 27 and 28, respectively, and the respective pistons have corresponding bearing rings for ensuring good bearing support for the mutually movable parts.
  • the respective slits which are formed at the piston rod means are outmost provided with wipers for minimizing introduction of abrasive material to the bearing surfaces. Seals are arranged at suitable positions in a manner known per se, which is not discussed further here.
  • the guide unit 3 has a guide sleeve 31 which is intended to guide the drill string during drilling and thereby, during drilling, take up shocks and forces resulting from movements of the drill string from it's ideal position. Between the rear portion of the guide unit 3 and the jaw ring 4 is arranged a minor slot 32 which is measured such that the movement of the first jaw 7 up and down is not prevented at the same time as the rear surface of the guide unit 3 provides a rotation stop which prevents rotation of the jaw ring 4 about the axis of the first cylinder. In the guide sleeve 31 is arranged a cavity, wherein a drill bit can be received.
  • the second jaw is stud-shaped and convex and rotation symmetrical, wherefore in this embodiment it does not need to be secured against rotation.
  • FIG. 3 is diagrammatically shown a rock drilling device for the inclusion in a drill rig, said rock drilling device including a rock drilling machine 36, a drill sting 38, a feed beam 37 and a feed-slide 39 for carrying the drilling machine 36.
  • a drill string guide device Distally on the feed-beam 37 is arranged a drill string guide device according to the invention.
  • Figs 4a and b are shown, as seen in the axial direction of a drill string to be gripped, the drill string guide device 1 with the jaws in a releasing position and an engagement position, respectively.
  • the engagement surface of the first jaw 7 has a first portion 40 with a radius of curvature r adapted for gripping a drill string, and a second portion 41 being comprised of two engagement areas at the sides of the first portion, with a greater radius of curvature R which is adapted so as to grip a joining sleeve.
  • the jaws can thus be shaped otherwise with, as an example, a jaw ring 4 which can be opened sideways in order to allow sideways introduction of a drill string.
  • the second jaw can also be non-rotational symmetrical, for example have a shape which is similar to or the same as the first jaw 7 and be partly surrounding a drill string. In that case a rotation stop must be arranged, which can be made as is per se well-known.
  • the drill string guide device can be without the guide unit 3 even if the shown arrangement is preferred for the sake of wear and maintenance.
  • the cylinders can be arranged otherwise, for example such that the second cylinder is received in the housing axially following, or outside, the first cylinder and thus is not received inside the first piston unit.
  • the cylinders can be made single-acting, for example by positioning a spring of some kind, mechanic or pneumatic or/and synthetic for actuation of the respective piston in one of the directions. A simple solution is thereby to position a metal pressure spring in the second end wall chamber for action between the lower part of the second piston and the upper portion of the second cylinder end wall.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)

Abstract

L'invention concerne un dispositif de guide de train de forage (1) pour montage sur un faisceau d'alimentation d'une tour de forage de roche permettant le support d'un train de forage (38) et comprenant une enveloppe (6) dans laquelle sont disposés un dispositif à cylindre et piston permettant de manœuvrer une première mâchoire (7) et une seconde mâchoire (8), chacune des mâchoires étant déplaçable entre une position d'engagement vers une position du train de forage (38) et permettant de s'engager dans celui-ci et une position de libération à partir du train de forage (38) pour le libérer. Le dispositif à piston et à cylindre comprend un premier cylindre de fluide (13) comportant une première unité de piston (9) permettant de manœuvrer la première mâchoire, supportée par la première unité de piston ; le dispositif à piston et le cylindre comprend un second cylindre de fluide (35) et une seconde unité de piston (14) permettant de manœuvrer seconde mâchoire, supportée par la seconde unité de piston et guidée dans la première unité de piston. L'invention concerne également un dispositif de forage de roche.
PCT/SE2007/000367 2006-04-21 2007-04-18 Dispositif de forage de roche WO2007123460A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP07748032A EP2010749A1 (fr) 2006-04-21 2007-04-18 Dispositif de forage de roche
AU2007241585A AU2007241585B2 (en) 2006-04-21 2007-04-18 Rock drilling device
CA2644582A CA2644582C (fr) 2006-04-21 2007-04-18 Dispositif de forage de roche

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0600880-9 2006-04-21
SE0600880A SE0600880L (sv) 2006-04-21 2006-04-21 Borrstödanordning med kolvcylinderanordning med en första och andra fluidcylinder och bergborrningsanordning inkluderande en sådan borrstödanordning

Publications (1)

Publication Number Publication Date
WO2007123460A1 true WO2007123460A1 (fr) 2007-11-01

Family

ID=38625271

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2007/000367 WO2007123460A1 (fr) 2006-04-21 2007-04-18 Dispositif de forage de roche

Country Status (6)

Country Link
EP (1) EP2010749A1 (fr)
AU (1) AU2007241585B2 (fr)
CA (1) CA2644582C (fr)
SE (1) SE0600880L (fr)
WO (1) WO2007123460A1 (fr)
ZA (1) ZA200807589B (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE415117B (sv) * 1975-12-11 1980-09-08 Craelius Ab Borrstrengshallare for en bergborrmaskin
SE445941B (sv) * 1980-10-29 1986-07-28 Mannesmann Ag Klemanordning for borrstenger
US6860343B2 (en) * 2001-11-29 2005-03-01 Atlas Copco Craelius Ab Drill rod holder

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE415117B (sv) * 1975-12-11 1980-09-08 Craelius Ab Borrstrengshallare for en bergborrmaskin
SE445941B (sv) * 1980-10-29 1986-07-28 Mannesmann Ag Klemanordning for borrstenger
US6860343B2 (en) * 2001-11-29 2005-03-01 Atlas Copco Craelius Ab Drill rod holder

Also Published As

Publication number Publication date
AU2007241585B2 (en) 2012-05-10
ZA200807589B (en) 2009-11-25
EP2010749A1 (fr) 2009-01-07
CA2644582C (fr) 2014-08-26
AU2007241585A1 (en) 2007-11-01
CA2644582A1 (fr) 2007-11-01
SE0600880L (sv) 2007-10-22

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