CA2430513A1 - Flushed rock drill - Google Patents
Flushed rock drill Download PDFInfo
- Publication number
- CA2430513A1 CA2430513A1 CA 2430513 CA2430513A CA2430513A1 CA 2430513 A1 CA2430513 A1 CA 2430513A1 CA 2430513 CA2430513 CA 2430513 CA 2430513 A CA2430513 A CA 2430513A CA 2430513 A1 CA2430513 A1 CA 2430513A1
- Authority
- CA
- Canada
- Prior art keywords
- drill
- drilling head
- drill rod
- rock drill
- filling chamber
- 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.)
- Abandoned
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/36—Percussion drill bits
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B4/00—Drives for drilling, used in the borehole
- E21B4/06—Down-hole impacting means, e.g. hammers
- E21B4/14—Fluid operated hammers
Abstract
A rock drill includes a liquid-flushed, pot-shaped drilling head axially movable, within predetermined limits, relative to the drill rod which forms a piston that defines, together with an inner surface of the drilling head, a variable volume filling chamber, and at least one hydrodynamical narrow opening for filling the filling chamber with fluid,
Description
BACKGROUND OF THE INVENTION
1. Field of the Invention The present invention relates to a liquid-flushed rock drill having a drilling head axially movable, within predetermined limits, relative to a drill rod and used, advantageously, for drilling blast bores in mining industry.
1. Field of the Invention The present invention relates to a liquid-flushed rock drill having a drilling head axially movable, within predetermined limits, relative to a drill rod and used, advantageously, for drilling blast bores in mining industry.
2. Description of the Prior Art U.S. Patent No. 6,021,855 discloses a water-flushed rock drill having a water-flushed, pot-shaped drilling head axially movable, within predetermined limits, io relative to a drill rod, which permits to achieve a high output. The freely axially movable, within predetermined limits, drilling head impacts, at an idle or blank impact, without being damped, a drive side axial stop, which results in an excessive material fatigue.
An object of the present invention is to provide a rock drill with a drilling head axial movable, within predetermined limits, relative to a drill rod and with a reduced material fatigue even during idle impacts.
SUMMARY OF THE INVENTION
This and other objects of the present invention, which will become apparent hereinafter, are achieved by providing a rock drill including a drill rod, a liquid-2o flushed, pot-shaped, drilling head axially movable, within predetermined limits, relative to the drill rod with the drill rod forming a piston that defines, together with an inner surface of the drilling head, a variable volume filling chamber, and at least one hydrodynamical narrow opening for filling the filling chamber with fluid.
During blank impacts of the drilling head, the free movement with large oscillation amplitudes is damped as result of hydrodynamic resistance which is caused by flow of a substantially incompressible fluid under pressure through the hydrodynamical narrow opening from the variable volume filling chamber. During the operational stage, when the drilling head contacts the worked stone, the oscillation amplitude, which is rather small in this case, is absorbed due to the elasticity of the fluid in the filling chamber, and damping hardly takes place.
Advantageously, the at least one hydrodynamical narrow opening is formed as a hydrodynamical narrow gap, which permits to avoid arrangement of sealing io means between the drill rod and the drilling head.
Advantageously, the drilling head has a drive side, axial stop element for the drill rod and which closes the filling chamber from the drive side. This provides for an easy mounting and dismounting of the drilling head.
Advantageously, the axial stop is formed as a multi-piece nut which is arranged in the radially narrowing region of the drill rod. This likewise facilitate assembly of the drilling head.
Advantageously, both the drilling head and the drill rod have associated rotation transmitting elements, such as polygons, which formlockingly cooperate with each other. This provides for transmission of a torque from the drill rod to the drilling 2o head.
Advantageously, the drive side stop element forms part of the rotation-transmitting element, e.g., an inner polygon or an arcuate feather key which transmits a torque from the drill rod to the drilling head during its axial movement. The axial stop element is formed as a replaceable part with a low wear-resistance.
The novel feature of the present invention, which are considered as characteristic for the invention, are set forth in the appended claims. The invention itself, however both as to its construction and its mode of operation, together with additional advantages and objects thereof, will be best understood from the following detailed description of preferred embodiments, when read with reference to the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS:
The drawings show:
Fig. 1 a longitudinal cross-section view of a rock drill Io according to the present invention in an operational position of the drilling head;
Fig. 2 a cross-sectional view along line I I-II in Fig. 1; and Fig. 3 a longitudinal cross-sectional view of the rock drill shown in Fig. 1 with a condition of the drilling head during a blank impact.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
A liquid-flushed rock drill 1 according to the present invention, which is shown in Figs. 1-3, has a drilling rod 3, a pot-shaped drilling head 4 movable axially, within predetermined limits, relative to the drill rod 3, and an insert 2 which is formed of 2o a hard material and is received in the drilling head 4. The drill rod 3 forms a piston 6 which defines, together with an inner surface 5 of the drilling head 4, a filling chamber 8 the volume of which is changed during movement of the piston 6 relative to the inner surface 5 of the drilling head 4 and which is equal to nil in an end position of the piston 6 adjacent to the tool with which the rock drill 1 is used. The filling chamber 8 is filled with fluid or is discharged through several hydrodynamic narrow openings 7a, 7b, 7c, 7d.
The openings 7a, 7b, 7c, 7d are formed, respectively of radial bores in the drill rod 3 and the drilling head 4 and annular gaps formed between the inner surface 5 of the drilling head 4 and the drill rod 3.
The drilling head 4 has axial stop means 9 for the piston 6 of the drill rod 3 and which is provided at a drive side of the drilling head 4. The axial stop means 9 is formed as a two-piece ring nut the two pieces of which are arranged in the radially 1o narrowing region of the drill rod 3. The ring nut closes the filling chamber 8 from the tool side. Upon the piston 6 reaching the axial stop means 9, the volume of the filling chamber 8 becomes equal to nil (see Fig. 3). The axial stop means 9 is formed of a softer steel than the drilling head 4 is formed of and is less wear-resistant than the drilling head 4 which is formed of a fully hardened steel. The axial stop means 9 forms part of rotation transmitting means 10 that is formed as a chamfered tetrahedron corresponding to the outer profile 11 of the drill rod 3 (see Fig. 2).
Though the present invention was shown and described with references to the preferred embodiment, such is merely illustrative of the present invention and is not to be construed as a limitation thereof and various modifications of the present 2o invention will be apparent to those skilled in the art. It is therefore not intended that the present invention be limited to the disclosed embodiment of details thereof, and the present invention includes all variations and/or alternative embodiments within the spirit and scope of the present invention as defined by the appended claims.
An object of the present invention is to provide a rock drill with a drilling head axial movable, within predetermined limits, relative to a drill rod and with a reduced material fatigue even during idle impacts.
SUMMARY OF THE INVENTION
This and other objects of the present invention, which will become apparent hereinafter, are achieved by providing a rock drill including a drill rod, a liquid-2o flushed, pot-shaped, drilling head axially movable, within predetermined limits, relative to the drill rod with the drill rod forming a piston that defines, together with an inner surface of the drilling head, a variable volume filling chamber, and at least one hydrodynamical narrow opening for filling the filling chamber with fluid.
During blank impacts of the drilling head, the free movement with large oscillation amplitudes is damped as result of hydrodynamic resistance which is caused by flow of a substantially incompressible fluid under pressure through the hydrodynamical narrow opening from the variable volume filling chamber. During the operational stage, when the drilling head contacts the worked stone, the oscillation amplitude, which is rather small in this case, is absorbed due to the elasticity of the fluid in the filling chamber, and damping hardly takes place.
Advantageously, the at least one hydrodynamical narrow opening is formed as a hydrodynamical narrow gap, which permits to avoid arrangement of sealing io means between the drill rod and the drilling head.
Advantageously, the drilling head has a drive side, axial stop element for the drill rod and which closes the filling chamber from the drive side. This provides for an easy mounting and dismounting of the drilling head.
Advantageously, the axial stop is formed as a multi-piece nut which is arranged in the radially narrowing region of the drill rod. This likewise facilitate assembly of the drilling head.
Advantageously, both the drilling head and the drill rod have associated rotation transmitting elements, such as polygons, which formlockingly cooperate with each other. This provides for transmission of a torque from the drill rod to the drilling 2o head.
Advantageously, the drive side stop element forms part of the rotation-transmitting element, e.g., an inner polygon or an arcuate feather key which transmits a torque from the drill rod to the drilling head during its axial movement. The axial stop element is formed as a replaceable part with a low wear-resistance.
The novel feature of the present invention, which are considered as characteristic for the invention, are set forth in the appended claims. The invention itself, however both as to its construction and its mode of operation, together with additional advantages and objects thereof, will be best understood from the following detailed description of preferred embodiments, when read with reference to the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS:
The drawings show:
Fig. 1 a longitudinal cross-section view of a rock drill Io according to the present invention in an operational position of the drilling head;
Fig. 2 a cross-sectional view along line I I-II in Fig. 1; and Fig. 3 a longitudinal cross-sectional view of the rock drill shown in Fig. 1 with a condition of the drilling head during a blank impact.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
A liquid-flushed rock drill 1 according to the present invention, which is shown in Figs. 1-3, has a drilling rod 3, a pot-shaped drilling head 4 movable axially, within predetermined limits, relative to the drill rod 3, and an insert 2 which is formed of 2o a hard material and is received in the drilling head 4. The drill rod 3 forms a piston 6 which defines, together with an inner surface 5 of the drilling head 4, a filling chamber 8 the volume of which is changed during movement of the piston 6 relative to the inner surface 5 of the drilling head 4 and which is equal to nil in an end position of the piston 6 adjacent to the tool with which the rock drill 1 is used. The filling chamber 8 is filled with fluid or is discharged through several hydrodynamic narrow openings 7a, 7b, 7c, 7d.
The openings 7a, 7b, 7c, 7d are formed, respectively of radial bores in the drill rod 3 and the drilling head 4 and annular gaps formed between the inner surface 5 of the drilling head 4 and the drill rod 3.
The drilling head 4 has axial stop means 9 for the piston 6 of the drill rod 3 and which is provided at a drive side of the drilling head 4. The axial stop means 9 is formed as a two-piece ring nut the two pieces of which are arranged in the radially 1o narrowing region of the drill rod 3. The ring nut closes the filling chamber 8 from the tool side. Upon the piston 6 reaching the axial stop means 9, the volume of the filling chamber 8 becomes equal to nil (see Fig. 3). The axial stop means 9 is formed of a softer steel than the drilling head 4 is formed of and is less wear-resistant than the drilling head 4 which is formed of a fully hardened steel. The axial stop means 9 forms part of rotation transmitting means 10 that is formed as a chamfered tetrahedron corresponding to the outer profile 11 of the drill rod 3 (see Fig. 2).
Though the present invention was shown and described with references to the preferred embodiment, such is merely illustrative of the present invention and is not to be construed as a limitation thereof and various modifications of the present 2o invention will be apparent to those skilled in the art. It is therefore not intended that the present invention be limited to the disclosed embodiment of details thereof, and the present invention includes all variations and/or alternative embodiments within the spirit and scope of the present invention as defined by the appended claims.
Claims (6)
1. A rock drill, comprising a drill rod; a liquid-flushed, pot-shaped drilling head axially movable, within predetermined limits, relative to the drill rod, the drill rod forming a piston that defines, together with an inner surface of the drilling head, a variable volume filling chamber; and at least one hydrodynamical narrow opening for filling the filling chamber with fluid.
2. A rock drill according to claim 1, wherein the at least one hydrodynamical narrow opening is formed as a hydrodynamical narrow gap.
3. A rock drill according to claim 1, wherein the drilling head has, at a drive side thereof, axial stop means for the drill head, the axial stop means being releasably connected with the drill head and limiting the filling chamber at a drive side end of the filling chamber.
4. A rock drill according to claim 3, wherein the axial stop means is formed as a multi-piece ring nut.
5. A rock drill according to claim 3, wherein both the drilling head and the drill rod comprise respective rotation-transmitting means formlockingly cooperating with each other.
6. A rock drill according to claim 3, wherein the axial stop means form part of rotation-transmitting means which transmits a torque from the drill rod to the drill head.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10225061.8-24 | 2002-06-06 | ||
| DE2002125061 DE10225061A1 (en) | 2002-06-06 | 2002-06-06 | Rock drill has liquid flushed pot-shaped drilling head having volume variable chamber with hydrodynamical narrow opening, axially moved with predetermined limits relative to drill rod |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2430513A1 true CA2430513A1 (en) | 2003-12-06 |
Family
ID=7714625
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2430513 Abandoned CA2430513A1 (en) | 2002-06-06 | 2003-05-30 | Flushed rock drill |
Country Status (7)
| Country | Link |
|---|---|
| AU (1) | AU2003204341A1 (en) |
| BR (1) | BR0301666A (en) |
| CA (1) | CA2430513A1 (en) |
| DE (1) | DE10225061A1 (en) |
| PL (1) | PL360500A1 (en) |
| SE (1) | SE0301499L (en) |
| ZA (1) | ZA200304410B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114562196B (en) * | 2022-01-19 | 2022-12-09 | 张家口宣化华泰矿冶机械有限公司 | Piston buffer mechanism and rock drill |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE134369C (en) * | ||||
| SU301098A1 (en) * | 1970-01-19 | 1976-10-25 | Институт Горного Дела Со Ан Ссср | Pneumatic percussion device for the formation of a well in the ground |
| SE506527C2 (en) * | 1995-08-31 | 1997-12-22 | Sandvik Ab | Method, rock drilling tools, rock drill bit and intermediate elements for transferring stroke array from a top hammer assembly |
-
2002
- 2002-06-06 DE DE2002125061 patent/DE10225061A1/en not_active Ceased
-
2003
- 2003-05-22 SE SE0301499A patent/SE0301499L/en not_active Application Discontinuation
- 2003-05-23 AU AU2003204341A patent/AU2003204341A1/en not_active Abandoned
- 2003-05-30 CA CA 2430513 patent/CA2430513A1/en not_active Abandoned
- 2003-06-03 BR BR0301666-8A patent/BR0301666A/en not_active Application Discontinuation
- 2003-06-04 PL PL03360500A patent/PL360500A1/en not_active IP Right Cessation
- 2003-06-05 ZA ZA200304410A patent/ZA200304410B/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| SE0301499D0 (en) | 2003-05-22 |
| AU2003204341A1 (en) | 2004-01-08 |
| SE0301499L (en) | 2003-12-07 |
| PL360500A1 (en) | 2003-12-15 |
| DE10225061A1 (en) | 2004-01-08 |
| ZA200304410B (en) | 2004-04-23 |
| BR0301666A (en) | 2004-08-24 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |