CA1093063A - Reamer stabilizer for rock drills - Google Patents
Reamer stabilizer for rock drillsInfo
- Publication number
- CA1093063A CA1093063A CA321,372A CA321372A CA1093063A CA 1093063 A CA1093063 A CA 1093063A CA 321372 A CA321372 A CA 321372A CA 1093063 A CA1093063 A CA 1093063A
- Authority
- CA
- Canada
- Prior art keywords
- keeper
- axles
- axle
- passage
- extending
- 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
Links
- 239000003381 stabilizer Substances 0.000 title claims abstract description 19
- 239000011435 rock Substances 0.000 title claims abstract description 9
- 239000012530 fluid Substances 0.000 claims description 15
- 238000005553 drilling Methods 0.000 claims description 8
- 230000002093 peripheral effect Effects 0.000 claims 1
- 235000004240 Triticum spelta Nutrition 0.000 abstract 1
- 240000003834 Triticum spelta Species 0.000 abstract 1
- 241001131696 Eurystomus Species 0.000 description 10
- 230000000087 stabilizing effect Effects 0.000 description 4
- 230000000712 assembly Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 2
- 229920000136 polysorbate Polymers 0.000 description 2
- NLZUEZXRPGMBCV-UHFFFAOYSA-N Butylhydroxytoluene Chemical compound CC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 NLZUEZXRPGMBCV-UHFFFAOYSA-N 0.000 description 1
- 235000004035 Cryptotaenia japonica Nutrition 0.000 description 1
- 102000007641 Trefoil Factors Human genes 0.000 description 1
- 235000015724 Trifolium pratense Nutrition 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000006854 communication Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- GZUITABIAKMVPG-UHFFFAOYSA-N raloxifene Chemical compound C1=CC(O)=CC=C1C1=C(C(=O)C=2C=CC(OCCN3CCCCC3)=CC=2)C2=CC=C(O)C=C2S1 GZUITABIAKMVPG-UHFFFAOYSA-N 0.000 description 1
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
- E21B10/26—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers
- E21B10/28—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers with non-expansible roller cutters
- E21B10/30—Longitudinal axis roller reamers, e.g. reamer stabilisers
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
Spelts 1 REAMER STABILIZER FOR ROCK DRILLS
ABS TRACT OF THE DISCLOSURE
A reamer and stabilizer assembly for rock drills having a substantially cylindrical body pro-vided with a threaded end socket for connection to a drill stem, the body having circumferentially spaced longitudinally extending recesses for re-ceiving reaming and stabilizer rollers mounted on axles extending parallel to the axis of the body, each reamer and roller assembly being removably re-tained in its recess by a keeper pin which can be inserted or retracted through a keeper pin passage opening into the threaded socket and into a longit-udinal passage through each axle.
ABS TRACT OF THE DISCLOSURE
A reamer and stabilizer assembly for rock drills having a substantially cylindrical body pro-vided with a threaded end socket for connection to a drill stem, the body having circumferentially spaced longitudinally extending recesses for re-ceiving reaming and stabilizer rollers mounted on axles extending parallel to the axis of the body, each reamer and roller assembly being removably re-tained in its recess by a keeper pin which can be inserted or retracted through a keeper pin passage opening into the threaded socket and into a longit-udinal passage through each axle.
Description
3(~63
(2) BACKGROUND OF T~E INVENTION
Field of the Invention This invention relates to rock drilling apparatus, and in particular to reamer and stabilizer assemblies adapted to be fitted between the bit and drill stem.
Prior Art .
In rock drills it is customary to utilize a stabilizer reamer between the bit o~ the rock drill and the driLl stem. With the stabilizer thus in-stalled, the bit which normally has a tendency to wander is somewhat directionally stabilized so that drilling follows a straight course.
The stabilizer units,which are secured at one end to the bit an at one end to the drill stem, usually have three or more roller assemblies which lie on a circle having a diameter approximately the same as the drill bit so as to have a tight, yet rotatable, fit in the hole drilled by the bit. The stabilizing rollers do C~3
Field of the Invention This invention relates to rock drilling apparatus, and in particular to reamer and stabilizer assemblies adapted to be fitted between the bit and drill stem.
Prior Art .
In rock drills it is customary to utilize a stabilizer reamer between the bit o~ the rock drill and the driLl stem. With the stabilizer thus in-stalled, the bit which normally has a tendency to wander is somewhat directionally stabilized so that drilling follows a straight course.
The stabilizer units,which are secured at one end to the bit an at one end to the drill stem, usually have three or more roller assemblies which lie on a circle having a diameter approximately the same as the drill bit so as to have a tight, yet rotatable, fit in the hole drilled by the bit. The stabilizing rollers do C~3
3) actullly perform a reamin~ function in many cases as they are provided with bits or protrusions which re-move certain anomolies in the drill hole caused by the action of the bit.
s In those stabilizer reamers wherein more of a stabilizing, rather than reaming, function is per-formed, the stabilizer rolls are usually of a cylin-drical nat~re and mounted for rotation on axles which extend parallel to the rotational axis of the bit.
After much usage the roller bits quite frequently wear as do the bearings between the axles and the rollers, and it is quite often necessary to change the stabilizer rolls from time to time.
In most reamer and stabilizing units of prior art, the axles on which the rolls are mounted are usually held in place on the stabilizer body by exteriorily available screws or studs which are themselves subject to wear during an operation and, consequently, the removal and replacement of rolls becomes a work-shop rather than on-the-spot opera-tion~ and special tools are required. Consequently, unless there is a stabilizer unit immediately at hand to replace the entire worn stabilizer unit, the down time becomes excessive.
~(~93U63
s In those stabilizer reamers wherein more of a stabilizing, rather than reaming, function is per-formed, the stabilizer rolls are usually of a cylin-drical nat~re and mounted for rotation on axles which extend parallel to the rotational axis of the bit.
After much usage the roller bits quite frequently wear as do the bearings between the axles and the rollers, and it is quite often necessary to change the stabilizer rolls from time to time.
In most reamer and stabilizing units of prior art, the axles on which the rolls are mounted are usually held in place on the stabilizer body by exteriorily available screws or studs which are themselves subject to wear during an operation and, consequently, the removal and replacement of rolls becomes a work-shop rather than on-the-spot opera-tion~ and special tools are required. Consequently, unless there is a stabilizer unit immediately at hand to replace the entire worn stabilizer unit, the down time becomes excessive.
~(~93U63
4) SUMMARY OF THE INVENTION
The present invention provides a rea~.er stabilizer apparatus having removable reamer and stabilizer rolls which are secured in position to be removed and replaced on site by the drill opera-tors and thus reduce down-time normally experienced in operations of this nature.
The reamer and stabili~er apparatus of the present invention has an elongated cylindrical body having a threaded socket at one end ~or con-nection to the threaded end of a driLl stem , the body also having circumferentially spaced recesses having opposite end wahls , each end wall having an out~ardly opening radially ex-tending seat ,. a roller axle having a roller mounted thereon-~or each-recessj~each axle having extending portions slidably received by ~h~ seats, each axle having a longitudinally extending bore,.
the body~having a keeper pin passage extending be-tween the threaded socket and a seat aligned with the axle bore and a socket at the opposite seat aligned . with the bore; a keeper pin adapted to extend through the passage and bore for engagement at the opposite end with the last mentioned socket and means ., .
,,
The present invention provides a rea~.er stabilizer apparatus having removable reamer and stabilizer rolls which are secured in position to be removed and replaced on site by the drill opera-tors and thus reduce down-time normally experienced in operations of this nature.
The reamer and stabili~er apparatus of the present invention has an elongated cylindrical body having a threaded socket at one end ~or con-nection to the threaded end of a driLl stem , the body also having circumferentially spaced recesses having opposite end wahls , each end wall having an out~ardly opening radially ex-tending seat ,. a roller axle having a roller mounted thereon-~or each-recessj~each axle having extending portions slidably received by ~h~ seats, each axle having a longitudinally extending bore,.
the body~having a keeper pin passage extending be-tween the threaded socket and a seat aligned with the axle bore and a socket at the opposite seat aligned . with the bore; a keeper pin adapted to extend through the passage and bore for engagement at the opposite end with the last mentioned socket and means ., .
,,
(5) 1 ~9 3~ 6 3 detachably secured to the body in said last mentioned threaded socket for res~raining the keeper pin.
In another aspect of the invention, each keeper pin has a longitudinally extending fluid pass-age for receiving drilling fluid pumped into the last mentioned threaded socket and an intersecting fluid passage aligned with a lateral fluid passage in the associated axle for enabling flow of fluid between the axle and its associated roller.
A detailed ~escription ~ollowing, related to the drawings, gives exemplification of apparatus according to the invention which, however, is capable of expression in means other than those particularly described and illustrated.
:
Fig. 1 i9 an elevation of the reamer stabil-izer apparatus, partially sectioned, . 2 5 Fig. 2 is an end view thereof, 10~ 63
In another aspect of the invention, each keeper pin has a longitudinally extending fluid pass-age for receiving drilling fluid pumped into the last mentioned threaded socket and an intersecting fluid passage aligned with a lateral fluid passage in the associated axle for enabling flow of fluid between the axle and its associated roller.
A detailed ~escription ~ollowing, related to the drawings, gives exemplification of apparatus according to the invention which, however, is capable of expression in means other than those particularly described and illustrated.
:
Fig. 1 i9 an elevation of the reamer stabil-izer apparatus, partially sectioned, . 2 5 Fig. 2 is an end view thereof, 10~ 63
(6) Figs. 3 and 4 are views taken on Lines 3 and 4, respectively, of Fig. 1, Fig. 5 is a perspective view of a roller axle.
DETAILED DESCRIPTION
Referring to the drawings, and in particular to Fig. 1, there is shown the reamer and stabilizer apparatus of the present in~ention which is adapted to be connected between a threaded male end of a lower-most section of drill stem (not shown) and the threaded male end (not shown) of a conventional rock drilling bit. The apparatus has an elongated cyl-indrical body 11 having at one end a tapered threaded socket 12 which threadedly accepts the threaded male end of the drill stem and at its opposite end a sim-ilar tapered threaded socket 13 which threadedly accepts the tapered male threaded end of the con-ventional rock drilling bit. The socket 12 has a planar bottom 14 and the socket 13 has a planar bottom 15. The body is also provided with longit-udinally extending circumferentially spaced semi-spherical recesses 16 within which reamer and sta-bilizing roller units 17 are mounted.
DETAILED DESCRIPTION
Referring to the drawings, and in particular to Fig. 1, there is shown the reamer and stabilizer apparatus of the present in~ention which is adapted to be connected between a threaded male end of a lower-most section of drill stem (not shown) and the threaded male end (not shown) of a conventional rock drilling bit. The apparatus has an elongated cyl-indrical body 11 having at one end a tapered threaded socket 12 which threadedly accepts the threaded male end of the drill stem and at its opposite end a sim-ilar tapered threaded socket 13 which threadedly accepts the tapered male threaded end of the con-ventional rock drilling bit. The socket 12 has a planar bottom 14 and the socket 13 has a planar bottom 15. The body is also provided with longit-udinally extending circumferentially spaced semi-spherical recesses 16 within which reamer and sta-bilizing roller units 17 are mounted.
7) Each roller unit 17 has a roller 21, an axle 22 and a keeper pin 23. The rollers have a cylindrical configuration with slight end chamfers 24 and are studded with wear resistant material such as ~ungsten carbide inserts 25 The axles.are slightly longer than the rollers and have projecting end portions 26-26 which are machined to provide a pair of diametrically opposed parallel flats 27-27.
These end portions of the axles slidably fit in radially disposed outwardly opening seats 29 machined in end walls 30 of the recesses. The seats, it is seen, have parallel side walls 31, see Fig. 3, be-tween which the end portions of the axles slidably it, and inner end walls 32 engaged by the axle end portions when the latter are fully inserted into the seats. With the roller units fully inserted in their associated recesses, the rollers project slightly out-ward of the circumference of the body and lie on an im-aginary circle, the diameter of which is the same as the bit diameter~ ' The rollers ar-e maintain;ed in PoSition with'-in the recesses by means of the keeper pin 23.'~The : ' keeper pins are slidably insertable.through bores 33 extending be~een the socket bottom 14 and open . into the'recess of ~he seat adjacent, thence through a longitudinally extending keeper pin passage 34 ~9 3Q 6 3 ~82 formed through.each axle and thence lnto a keeper pin socket 35 opening out of the seat adjacent to the socket bottom 15. Length of the keeper pins is such that each has an extending end portion 3~ projecting into the soc-ket 12. Each end portion 36, like the extending endportions of the axles, is provided with diametri-cally opposed parallel flats 38-38. The keeper pins are held in position by a keeper pin retaining plate 41 which fits against the socket bottom and is re-leasably secured thereto by machine bolts 42, Theplate 41, it is seen, has circumferentially spaced notches 43 having parallel side walls which are fittedly received by the flats 3~ of the extending end portions of the keeper pins.
In order to provide hydraulic fluid com-munication between the drill stem and the bit, the body ll of the apparatus is provided with a central fluid passage 45 which is shown as having a trefoil shape to provide the greatest possible cross-sec~ional area compatible wi~h strength..and the plate 41 is pro-vided wi~h a simila~ central passage 46.
Construction of the apparatus also enables drilling fluid to be used as a lubricant for the rol-lers. Referring particularly to Fig. l, it is seen..~hat each of th~ retainer pins has an.axial fluid passage ~ ~9 ~Q ~ 3 (9) 47 opening at one end through the extending end portion of eachpin and which communicates substan-tially at the Tniddl~ length of the pin with a lateral fluid passage 4~, which itself communicates with a lateral fluid passage 49 formed in each axle and which opens out of the outer surface thereof, Further, to facilitate extraction of the keeper pins ,the open ends of the fluid passages 47 are threaded to accept a threaded extractor whereby t'he pins may be withdrawn through the socket 12.
It is further to be noted that di~ensional relationship of the axles and the rollers relative to socket diameter is of great importance as axle diameter must be such that the keeper pins can be positioned to enable them ,to be withdrawn through the socket 12. As shown, the keeper pin passages through the axles are situated off-center of the latter so that the axles must have a diameter to enable thi~ to be done. The off-center aspect of the keeper pins i8 of no structural importance as all . the load 'taken by the .rollers -is trans-. ,.~
ferred to the body through e,ngagement.of the axles with the end walls o~ their seats,' no'load being25 taken by the keeper pins.
.
~(}93Q63 (10) It will also be eviden~ that the apparatus, .~ as described above, e~ables rollers and axles to be replaced very quickLy and easily as all that is necessary for this operation is to detach the drill stem from the body, remove the plate 41 by taking out the bolts 42 and extract the keeper pins to enable the whole roller unit to be pulled outwards of the seats. As the bolts 42 are internally located, they are not subject to wear and can always be removed by tools, such as~wrenches, which are normally readily available to the drilling operators.
. .
: 25
These end portions of the axles slidably fit in radially disposed outwardly opening seats 29 machined in end walls 30 of the recesses. The seats, it is seen, have parallel side walls 31, see Fig. 3, be-tween which the end portions of the axles slidably it, and inner end walls 32 engaged by the axle end portions when the latter are fully inserted into the seats. With the roller units fully inserted in their associated recesses, the rollers project slightly out-ward of the circumference of the body and lie on an im-aginary circle, the diameter of which is the same as the bit diameter~ ' The rollers ar-e maintain;ed in PoSition with'-in the recesses by means of the keeper pin 23.'~The : ' keeper pins are slidably insertable.through bores 33 extending be~een the socket bottom 14 and open . into the'recess of ~he seat adjacent, thence through a longitudinally extending keeper pin passage 34 ~9 3Q 6 3 ~82 formed through.each axle and thence lnto a keeper pin socket 35 opening out of the seat adjacent to the socket bottom 15. Length of the keeper pins is such that each has an extending end portion 3~ projecting into the soc-ket 12. Each end portion 36, like the extending endportions of the axles, is provided with diametri-cally opposed parallel flats 38-38. The keeper pins are held in position by a keeper pin retaining plate 41 which fits against the socket bottom and is re-leasably secured thereto by machine bolts 42, Theplate 41, it is seen, has circumferentially spaced notches 43 having parallel side walls which are fittedly received by the flats 3~ of the extending end portions of the keeper pins.
In order to provide hydraulic fluid com-munication between the drill stem and the bit, the body ll of the apparatus is provided with a central fluid passage 45 which is shown as having a trefoil shape to provide the greatest possible cross-sec~ional area compatible wi~h strength..and the plate 41 is pro-vided wi~h a simila~ central passage 46.
Construction of the apparatus also enables drilling fluid to be used as a lubricant for the rol-lers. Referring particularly to Fig. l, it is seen..~hat each of th~ retainer pins has an.axial fluid passage ~ ~9 ~Q ~ 3 (9) 47 opening at one end through the extending end portion of eachpin and which communicates substan-tially at the Tniddl~ length of the pin with a lateral fluid passage 4~, which itself communicates with a lateral fluid passage 49 formed in each axle and which opens out of the outer surface thereof, Further, to facilitate extraction of the keeper pins ,the open ends of the fluid passages 47 are threaded to accept a threaded extractor whereby t'he pins may be withdrawn through the socket 12.
It is further to be noted that di~ensional relationship of the axles and the rollers relative to socket diameter is of great importance as axle diameter must be such that the keeper pins can be positioned to enable them ,to be withdrawn through the socket 12. As shown, the keeper pin passages through the axles are situated off-center of the latter so that the axles must have a diameter to enable thi~ to be done. The off-center aspect of the keeper pins i8 of no structural importance as all . the load 'taken by the .rollers -is trans-. ,.~
ferred to the body through e,ngagement.of the axles with the end walls o~ their seats,' no'load being25 taken by the keeper pins.
.
~(}93Q63 (10) It will also be eviden~ that the apparatus, .~ as described above, e~ables rollers and axles to be replaced very quickLy and easily as all that is necessary for this operation is to detach the drill stem from the body, remove the plate 41 by taking out the bolts 42 and extract the keeper pins to enable the whole roller unit to be pulled outwards of the seats. As the bolts 42 are internally located, they are not subject to wear and can always be removed by tools, such as~wrenches, which are normally readily available to the drilling operators.
. .
: 25
Claims (5)
OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. Reamer and stabilizer apparatus for rock drilling equip-ment comprising:
(a) an elongated body member having a threaded socket at one end for connection to a threaded end of a drill stem, (b) means at the other end of the body member for con-necting a drill bit thereto, (c) the body member having a plurality of circumferen-tially spaced recesses having longitudinally spaced apart end walls, (d) a plurality of roller units, each unit having an axle and a roller rotatably mounted thereon, and each axle having a slidable fit between the end walls of each of the recesses, (e) each axle having a longitudinally extending keeper pin passage opening out of the ends thereof, (12) (f) bores extending between each recess wall and threaded socket aligned with the passages through the axles, (g) keeper pin retainer sockets opening out of the opposite end walls of the recesses aligned with the bores, (h) a keeper pin extending through the threaded socket and through each axle passage and engaging an associated keeper pin socket for releasably securing the axles within the recesses, (i) means releasably secured to the body within the threaded socket for preventing withdrawal of the keeper pins from the respective axles.
(a) an elongated body member having a threaded socket at one end for connection to a threaded end of a drill stem, (b) means at the other end of the body member for con-necting a drill bit thereto, (c) the body member having a plurality of circumferen-tially spaced recesses having longitudinally spaced apart end walls, (d) a plurality of roller units, each unit having an axle and a roller rotatably mounted thereon, and each axle having a slidable fit between the end walls of each of the recesses, (e) each axle having a longitudinally extending keeper pin passage opening out of the ends thereof, (12) (f) bores extending between each recess wall and threaded socket aligned with the passages through the axles, (g) keeper pin retainer sockets opening out of the opposite end walls of the recesses aligned with the bores, (h) a keeper pin extending through the threaded socket and through each axle passage and engaging an associated keeper pin socket for releasably securing the axles within the recesses, (i) means releasably secured to the body within the threaded socket for preventing withdrawal of the keeper pins from the respective axles.
2. Apparatus as claimed in Claim 1 in which each of the axles has extending end portions, said end portions having dia-metrically opposed flats, and seats formed in the end walls of each of the recesses for slidably receiving said axle end portions.
3. Apparatus as claimed in Claim 1 in which the keeper pins have end portions extending into the socket, said end portions having diametrically opposed flats and in which the means for retaining the keeper pins connected to their respective axles comprises a plate adapted to be secured (13) to the body against the threaded socket bottom, the plate having peripheral notches for accepting extending end por-tions of the keeper pins and bolts adapted to be extended through the plate into the body member.
4. Apparatus as claimed in Claim l in which the keeper pin passages extending through the axles are located off-center of the latter.
5. Apparatus as claimed in Claim l in which each of the keeper pins has a longitudinally extending fluid passage, a later-al passage intersecting said longitudinal passage and each axle has a lateral fluid passage normally aligned with said lateral passage through each of the keeper pins to enable passage of fluid from the threaded socket to the outer sur-face of each of the axles.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA321,372A CA1093063A (en) | 1979-02-13 | 1979-02-13 | Reamer stabilizer for rock drills |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA321,372A CA1093063A (en) | 1979-02-13 | 1979-02-13 | Reamer stabilizer for rock drills |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1093063A true CA1093063A (en) | 1981-01-06 |
Family
ID=4113523
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA321,372A Expired CA1093063A (en) | 1979-02-13 | 1979-02-13 | Reamer stabilizer for rock drills |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1093063A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2487907A1 (en) * | 1980-08-01 | 1982-02-05 | Oncor Corp | ROLLER ELELIZER DEVICE FOR USE ON A DRILLING FACILITY |
| US4793425A (en) * | 1985-06-26 | 1988-12-27 | White Kenneth M | Profiled body roller-reamer stabilizer |
-
1979
- 1979-02-13 CA CA321,372A patent/CA1093063A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2487907A1 (en) * | 1980-08-01 | 1982-02-05 | Oncor Corp | ROLLER ELELIZER DEVICE FOR USE ON A DRILLING FACILITY |
| US4793425A (en) * | 1985-06-26 | 1988-12-27 | White Kenneth M | Profiled body roller-reamer stabilizer |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |