GB2212748A - Drive head apparatus for a rock boring machine - Google Patents
Drive head apparatus for a rock boring machine Download PDFInfo
- Publication number
- GB2212748A GB2212748A GB8827553A GB8827553A GB2212748A GB 2212748 A GB2212748 A GB 2212748A GB 8827553 A GB8827553 A GB 8827553A GB 8827553 A GB8827553 A GB 8827553A GB 2212748 A GB2212748 A GB 2212748A
- Authority
- GB
- United Kingdom
- Prior art keywords
- drill string
- connector
- boring machine
- drive
- string connector
- 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
Links
- 239000011435 rock Substances 0.000 title description 3
- 230000002441 reversible effect Effects 0.000 claims description 2
- 230000002457 bidirectional effect Effects 0.000 claims 1
- 238000000034 method Methods 0.000 claims 1
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000005553 drilling Methods 0.000 description 3
- 238000005755 formation reaction Methods 0.000 description 3
- 101150039167 Bex3 gene Proteins 0.000 description 1
- 229910000906 Bronze Inorganic materials 0.000 description 1
- 239000010974 bronze Substances 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000000463 material Substances 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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
- E21B17/07—Telescoping joints for varying drill string lengths; Shock absorbers
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)
Description
1 DRIVE HEAD-APPARATUS FOR A ROCK BORING MACHINE 221127 43 This invention
relates to drive head apparatus f or driving the drill string of a rock boring machine.
-BACKGROUND OF THE INVENTION
When driving a drill string in rock boring, it is highly desirable tohave a floating and swivelling bearing for the drive connection, in order to absorb overturning forces trans-ii-itted by the drill string during drilling, or to guard against. any u,-,foreseen loads that might occur during operation. However, the i 4S ex-ensive provIsion of such flcat^ng and swivelling bearings -L. tl and, when worn, the bearings reclu-4--a expensive parts rani ace..r--en4t--. This also applies to the splined teeth used willth such a bearing, which normally wear in the recoiled position of the bearing, so that the rema-Jn,-4'---- of the length of the splined teeth along it-he axial recoil slide path are usually st-14-11 in good condition whillstthose at the recoiled end'are worn.
OBJECT OF THE INVENTION on to provide drive head It is an object of this invent 1. - apparaltus f or a drill string of a boring machine that can alleviate these problems.
SM.124ARY OF THE 1XVENTION In accordance with this invention there is provided drive head apparatus- for a drill string of a boring machine, said apparatus comprising one or two drill string connectors securable to drive a drill string, the connector(s) being floatingly mounted in a housing to recoil in use against resilient means whilst being connected to driving splin est there being an axially fixed bearing surface behind each drill string connector limiting the recoil movement, and each drill string connector having a co- operant floating bearing surface for engagement with t-he associated fixed bearing surface, the floating bearing sur-face being replaceably secured to the associated drill string connector.
Preferzably the dr-111 string connector has an appro.-..-J-..atply cross sec,--.-,.anal area arranged to achieve un-Jf:-o= te=erature treatment t', '"irc,-,ghrut C.e. connector.
Further preferably, in the case of a boring machine which is bi-d-'-rect.. &.onal, provision is made for a further drill connector to be ficatingly and swivellably mounted at an apposite side of the housing to the first drill str-4na connector, with the resilient means mounted bptc;een the two drill string connec-t,-crs, preferably being in the forn of a coil spring. There is also provided for the further drill string connector to have said _fixed and floating bearing surfaces.
St--ill further, provision is nade for a splined tooth ring drive for the drill string connectors, which is replaceably seated uni &-a= t, 1 in a ring body, and which is arranged to be reversible within its seating to have one axial end interchangeable with the other.
BRIEF DESCRIPTION OF THE 'DRAWING
A preferred embodiment of the invention is described below by way of example only,, and with reference to the accompanying drawing in which FIG. 1 is a view partly in axial cross-section and partly in side elevation of a boring machine drive head apparatus according to the invention.
DETAILED DESCRIPTION OF THE DRAWINGS
As illustrated in FIG.1, a housing I is shown enclosing crive head abparatus, the drive head and its parts being sy=metrical and concentric about a center axis 2, with one side 3 of the appaza"Cus being shown in axial cross-section.
In opposed a:,.ial relation, as shoi-m in side 3, are d=il I string connectors 4 and 5 respectively, being the upper and lower drill string connectors for use in either drilling up or dril-Ling do%-m. These drill string- connectors take the form, of a box sect-ion of a threaded drill pipe, in order to receive the pin of dr-4-1-1 pire sections which are made tip to fo= a drill string. Each connector is secured to an opposite end of a coil spring 6 so that recoil can occur with the formations sliding inwardly into the housing agains-L the spring biasing.
The uDver connector 4 has axial splines 7 around it which are relatively short in anial length, and located at the uppermost. end.
A floating bearing 8 is located around the spring 6 at the ins4Ade end of the formation, with a spheroidal surface 9 for contacting the spheroidal surface 10 of the axially stationary bearing body 11. at The.lower drill string connector 5 has a radial flange 1. its innermost end, and between the.flange and the wall of the boxlike connecting formation is located bearing 16 with a spherc'Ldal bearing surface 14. which is faced downwardly and is shown r=ing against a like fixed spheroidal bearing surface is secured to Ithe housing 1.
Each of the spheroidal bearings 8 and 16, which are secured to the drill string connectors 4 and 5, are of aluninum bronze, and are replaceably secured therein. In the case of the upper bear--ng insert 8, the insert is sultably secured as by bolt means shown), whereas the lower insert, 16 can be glued into since it will only incur a downward force which will be taken up by the annular flange 13.
In use, the spheroidal bearing surfaces 9, 10, 14 and 15, -4-0 properly greased and kept dirt free should not be wear par-lts but should there be wearing the inserts 8 and 16 can be removed and reDlaced without the necessity for replacing an expensive d-J-1 string connector with treated bearing surfaces, or replacing bearing body 11, which is an expensive casting. The bearing bc--,7 11 can thus be made of a suitably hard material with the intent--cn that the inserts 8 and 16 will wear if any wearing is to t-he place.
1 t k - t) - The provision of the bearing surfaces as replaceable parts allows the drill string connectors 4 and 5 to have approxinately uniform cross- sectional dimensions. This in turn allows f or a uniform heat treatment throughout the connectors.
Splined drive ring 17, by which the splines 7 of the drill string c onnector 4 are driven, is axially slidable out of it seating and. is connected therein by means of a splined connection 18 so that if wear at the upper position of the splines 7 occurs, the splined ring 17 can be axially reversed. Also, should the splined ring 17 ultimately wear out it can be replaced without the necessity of replacement of the body 11. Similar replaceable gear rings (not shown) can also be supplied for the lower drill string connector 5.
1
Claims (6)
1. Drive head apparatus for a drill string of a boring machine, said apparatus comprising a drill string connector securable to drive a- drill string, said connector being floatingly mounted in a housing to recoil in use against resilient means whilst being connected to driving splines, there being an axially fixed bearing surface behind the drill string connector having a co-operant floating bearing surface for engagement with the fixed bearing -surface, the floating bearing surface being replaceably secured to the drill string connector.
2. Apparatus as claimed in claim 1, in which the drill string connector has an approximately uniform cross-sectional area arranged to achieve uniform temperature treatment throughout the connector.
3. Apparatus as claimed in claim 1 or 2, arranged for use with a bidirectional boring machine and including a further drill string connector floatingly and swivellably mounted at an opposite side of the housing to the first drill string connector, with the resilient means arranged therebetween.
4. Apparatus as in claim 1, 2 or 3, wherein said resilient means is in the form of a coil spring.
5. Apparatus as claimed in claim 1, 2, 3 or 4, further comprising a splined tooth ring drive means for a drill string connector and a ring body in which the ring drive is replaceably seated, said ring drive being reversible in its seat to have one axial end interchangeable with the other.
v ll
6. Drive head apparatus,for a drill string of a boring machine substantially as hereinbefore described with reference to and as illustrated in the accompanying drawing.
is Published 1989 atThe Patent Office, State House, 86171 Holbon2, LondonWC1R 4TP. Further cople- - _be. obtained from The Patent 0Mce.' Sales Branch, St Mary Oray, Orpingtoi, Kent BR5 3RD. Printed by Multiplex techniques ltd F.1 --y Cray, Kent, Con. 1187
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ZA878873 | 1987-11-26 | ||
| US26752788A | 1988-11-04 | 1988-11-04 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8827553D0 GB8827553D0 (en) | 1988-12-29 |
| GB2212748A true GB2212748A (en) | 1989-08-02 |
| GB2212748B GB2212748B (en) | 1991-11-27 |
Family
ID=26952491
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8827553A Expired - Lifetime GB2212748B (en) | 1987-11-26 | 1988-11-25 | Drive head apparatus for a rock boring machine |
Country Status (4)
| Country | Link |
|---|---|
| AU (1) | AU600184B2 (en) |
| DE (1) | DE3839898C2 (en) |
| FI (1) | FI885483A (en) |
| GB (1) | GB2212748B (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3736993A (en) * | 1971-07-15 | 1973-06-05 | Robbins Co | High torque boring machine |
| US3800887A (en) * | 1972-02-07 | 1974-04-02 | Robbins Co | Drive head assembly for an earth drilling machine |
| ATE831T1 (en) * | 1978-08-25 | 1982-04-15 | Diamant Boart Societe Anonyme | DRIVE CHUCK FOR A DRILL ROD. |
| AU562909B2 (en) * | 1982-02-24 | 1987-06-25 | Drill Systems International Ltd | Drilling apparatus |
-
1988
- 1988-11-25 GB GB8827553A patent/GB2212748B/en not_active Expired - Lifetime
- 1988-11-25 DE DE3839898A patent/DE3839898C2/en not_active Expired - Lifetime
- 1988-11-25 AU AU25949/88A patent/AU600184B2/en not_active Expired
- 1988-11-25 FI FI885483A patent/FI885483A/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| FI885483A0 (en) | 1988-11-25 |
| AU2594988A (en) | 1989-06-01 |
| DE3839898A1 (en) | 1989-06-08 |
| FI885483A (en) | 1989-05-27 |
| GB2212748B (en) | 1991-11-27 |
| AU600184B2 (en) | 1990-08-02 |
| DE3839898C2 (en) | 1998-04-30 |
| GB8827553D0 (en) | 1988-12-29 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PE20 | Patent expired after termination of 20 years |
Expiry date: 20081124 |