WO2005014968A1 - Trepan a molettes - Google Patents

Trepan a molettes Download PDF

Info

Publication number
WO2005014968A1
WO2005014968A1 PCT/IB2004/002593 IB2004002593W WO2005014968A1 WO 2005014968 A1 WO2005014968 A1 WO 2005014968A1 IB 2004002593 W IB2004002593 W IB 2004002593W WO 2005014968 A1 WO2005014968 A1 WO 2005014968A1
Authority
WO
WIPO (PCT)
Prior art keywords
shaft
cutter
orientations
shell
insertion passage
Prior art date
Application number
PCT/IB2004/002593
Other languages
English (en)
Inventor
George Barnard Murray
Original Assignee
Murray & Roberts Ruc Limited
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 Murray & Roberts Ruc Limited filed Critical Murray & Roberts Ruc Limited
Publication of WO2005014968A1 publication Critical patent/WO2005014968A1/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
    • E21B10/00—Drill bits
    • E21B10/08—Roller bits
    • E21B10/10—Roller bits with roller axle supported at both ends
    • 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
    • E21B10/00—Drill bits
    • E21B10/08—Roller bits
    • E21B10/22—Roller bits characterised by bearing, lubrication or sealing details

Definitions

  • THIS invention relates to roller cutters.
  • the invention is concerned with roller cutters for raise borers and with the mounting of such cutters.
  • One known type of raise borer manufactured by Sandvik has a drill head carrying an array of cutter . mounts or “saddles" each supporting a roller cutter. Each roller cutter has a cutter shell mounted rotatably on a central shaft. Hardmetal abrasive buttons are set in pockets in the outer surface of the shell to perform a rock abrading action during use.
  • the central shaft has ends that project from the shell, which is supported rotatably on the shaft by bearings of both ball and cylindrical roller type. The ball bearings serve both to journal the shell on the shaft and to anchor it axially on the shaft.
  • the balls of the bearing are positioned in a retaining groove or track defined partially in the shaft and partially in the shell and are retained in the track so as to prevent relative axial movement between the shell and the shaft.
  • the balls are positioned in this way by feeding them through a ball insertion passage having an axial portion in the shaft and a radial portion which intersects the axial portion and opens into the retaining track.
  • the cutter mounts or “saddles” are roughly U-shaped with the base of the U-shape connected to the boring head and the legs thereof projecting transversely from the head. Recesses at the ends of the legs receive and support the ends of the cutter shafts which are anchored to the mounts in a non-rotatable manner by means of obliquely oriented locking pins.
  • force is transferred through the bearing balls to the shells of the roller cutters, to enable them to perform the required rock abrading action, from the shafts on which they are supported, and the reaction force from the rock is in the opposite direction. Because the shaft is fixed in position relative to the cutter mount, the same region of the shaft circumference, i.e.
  • the region facing in the boring direction is always subjected to greatest load.
  • the result is that the region of the shaft circumference against which the balls act and which faces in the boring direction wears more rapidly than other regions of the shaft circumference.
  • the severity of the localised wear on the shaft circumference is such that the shaft must be replaced even though regions of the shaft away from the main wear region may still be in a serviceable condition.
  • the radial portion of the ball insertion passage must be positioned away from the region of the maximum shaft wear. In the known design this radial portion is located diametrically opposite to that region.
  • the projecting ends of the shaft of a roller cutter are so shaped and positioned in relation to the orientation of the radial portion of the ball insertion passage of the cutter that the shaft can be supported by a cutter mount at at least two different angular orientations of the shaft about its axis, at each of which orientations the radial portion of the ball insertion passage faces in a direction away from the boring direction and at each of which orientations a different region of the shaft circumference faces in the boring direction.
  • the shaft ends may, for instance, be square in cross-section and be capable of reorientation through 90° relative to the cutter mount. It will be understood that the cutter mount itself must be capable of receiving the shaft ends non-rotatably at each of the selected orientations.
  • the invention accordingly extends to a roller cutter mounting arrangement for mounting a roller cutter on a boring machine, the cutter mounting arrangement including a cutter mount having recesses therein for supporting the ends of a shaft of the roller cutter and locking means for locking the shaft non- rotatably in the recesses, wherein the recesses are capable of receiving the ends of the shaft at at least two different orientations of the shaft about its axis and the locking means are operable to lock the ends of the shaft in the recesses at each of such orientations.
  • the locking means for each shaft end includes a cap connectable releasably to the cutter mount, the cutter mount and cap including part-rectangular recesses which in combination form a rectangular opening to receive and support a rectangular shaft end.
  • Figure 1 shows a partial longitudinal cross-sectional view of a conventional roller cutter
  • Figure 2 shows an end view of the conventional roller cutter mounted on a conventional cutter mount
  • Figure 3 shows a corresponding end view illustrating an embodiment of the invention with the cutter shaft at a first orientation
  • Figure 4 shows an end view similar to that of Figure 3 but with the cutter shaft at a second orientation
  • FIGS 5 and 6 show views similar to those of Figures 3 and 4 of another embodiment of the invention.
  • FIG 1 illustrates a conventional roller cutter 10 of a type manufactured by Sand ik.
  • the roller cutter 10 has a central shaft 12 on which a shell 14 is supported rotatably by bearing balls 16 and cylindrical bearing rollers 18.
  • the ball bearings 16 In addition to supporting the shell rotatably on the shaft, the ball bearings 16 also prevent relative axial movement between the shell and the shaft. To achieve this the balls are retained in a groove or track 20 defined partially in the shell and partially in the shaft.
  • the shell is placed on the shaft and the balls are introduced into the track 20 through a ball insertion passage having an axial portion 22 and a radial portion 24 which intersects the axial portion and opens into the track.
  • the balls are fed through the passage into the track and are prevented from returning along the passage by stops 26.
  • the ends 28 of the shaft project beyond the shell 14 and are square in cross-section. As will be apparent from Figure 2, the radial portion 24 of the ball insertion passage is oriented diagonally with respect to the ends of the shaft.
  • Figure 2 also shows the upper end of one leg 30 of a generally U-shaped cutter mount or saddle of conventional type.
  • the leg 30 is formed with a generally V-shaped recess 33 which receives a shaft end 28.
  • the shaft end is locked in this position by a locking means which in this case includes an obliquely oriented locking pin or bolt 34 which passes through an opening 36 in the shaft end and into an aligned opening 38 in the end of the leg 30 alongside the recess 33.
  • the arrow 32 indicates the boring direction, i.e. the direction in which boring will take place in use of the cutter 10. As explained previously, that region of the shaft 12 which faces in the direction 32 will be subjected during boring to the greatest wear.
  • the maximum wear region 35 is located approximately between the radial lines 39. In order to avoid damage to it, the radial portion 24 of the ball insertion passage faces downwardly, i.e. diametrically away from the boring direction 32 and spaced from the maximum wear region 35.
  • Figures 3 and 4 illustrate one embodiment of the invention in which the shaft ends 28 (only one visible) have been reoriented about the central shaft axis compared to the shaft ends in Figures 1 and 2.
  • the illustrated shaft end is at such an angle that the radial portion 24 of the ball insertion passage extends at right angles to opposite sides of the shaft ends. It will be understood that the shaft ends have effectively been rotated through an angle of 45° relative to their conventional orientation as illustrated in Figures 1 and 2.
  • Figure 3 shows the shaft end received by the recess 33.
  • the radial portion 24 of the ball insertion passage no longer faces diametrically away from the boring direction 32, but it nevertheless still faces away from that direction to the extent that it is again distanced from the maximum wear region, designated in Figure 3 by the numeral 35.1.
  • Figure 4 again shows the shaft end received by the recess 33, but in this case the shaft has been rotated through an angle of 90° relative to its orientation in Figure 3.
  • the result is that a new maximum wear region, designated 35.2 in Figure 4, faces in the boring direction.
  • the remainder of the roller cutter in Figures 3 and 4 may be the same as in the conventional design seen in Figures 1 and 2. It is envisaged that it will be possible to retrofit existing roller cutters with new shaft ends orientated in accordance with the invention. This may for instance be done at the time of refurbishing an existing roller cutter.
  • Figures 5 and 6 illustrate an arrangement in which both the shaft ends have been modified and in which the mount has a recess 33 with a modified shape. Comparison of Figures 5 and 6 again shows how the shaft 12 can be rotated to a new orientation in order to expose a new region of its surface to maximum wear during boring. It will be noted that the radial portion 24 of the ball insertion passage has moved through an angle of 90° during reorientation from the Figure 5 to the Figure 6 position.
  • the shaft can be positioned in one of two possible orientations. It is however with the scope of the invention for the shaft ends, and if necessary the recesses in the cutter mounts to be shaped as necessary so that more than two possible orientations are possible. In such cases the shaft ends may for instance have more than four sides as in the illustrated examples.

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)
  • Excavating Of Shafts Or Tunnels (AREA)

Abstract

L'invention concerne un trépan à molettes (10) du type utilisé dans des foreuses de montage. Le trépan comprend une coquille (14) et un arbre (12) sur lequel la coquille est montée rotative. L'arbre a des extrémités (28) qui s'étendent au-delà de la coquille et sont soutenues sur un support (30) du trépan. Un passage (22, 24) d'insertion de billes dans un chemin de billes qui porte la coquille de manière rotative sur l'arbre comprend une partie radiale (24) qui s'étend dans l'arbre transversalement à l'axe de l'arbre. Selon l'invention, les extrémités de l'arbre sont agencées par rapport à l'orientation de la partie radiale du passage d'insertion des billes de sorte que l'arbre puisse être porté par le support du trépan dans au moins deux positions angulaires différentes de l'arbre autour de son axe. Dans chacune de ces positions, la partie radiale du passage d'insertion des billes est orientée dans le sens opposé au sens de forage (32). En outre, dans chacune de ces positions, une zone différente (35.1, 35.2) de la circonférence de l'arbre est tournée dans le sens de forage.
PCT/IB2004/002593 2003-08-11 2004-08-11 Trepan a molettes WO2005014968A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA2003/6197 2003-08-11
ZA200306197 2003-08-11

Publications (1)

Publication Number Publication Date
WO2005014968A1 true WO2005014968A1 (fr) 2005-02-17

Family

ID=34136984

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2004/002593 WO2005014968A1 (fr) 2003-08-11 2004-08-11 Trepan a molettes

Country Status (1)

Country Link
WO (1) WO2005014968A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4004644A (en) * 1975-01-27 1977-01-25 Sandvik Aktiebolag Roller cutter
US20020166702A1 (en) * 2001-05-08 2002-11-14 Cariveau Peter T. Mounting attachment and bearing system for an industrial earth-boring cutter

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4004644A (en) * 1975-01-27 1977-01-25 Sandvik Aktiebolag Roller cutter
US20020166702A1 (en) * 2001-05-08 2002-11-14 Cariveau Peter T. Mounting attachment and bearing system for an industrial earth-boring cutter

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