CN203008785U - Tooth of roller bit - Google Patents
Tooth of roller bit Download PDFInfo
- Publication number
- CN203008785U CN203008785U CN 201220717959 CN201220717959U CN203008785U CN 203008785 U CN203008785 U CN 203008785U CN 201220717959 CN201220717959 CN 201220717959 CN 201220717959 U CN201220717959 U CN 201220717959U CN 203008785 U CN203008785 U CN 203008785U
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- tooth
- axis
- crown
- rock
- gear wheel
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- Withdrawn - After Issue
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Abstract
The utility model discloses a tooth of a roller bit. The tooth comprises a tooth column and a tooth crown which are integrated. The characteristic parameters of the tooth on the roller bit include roller toothed surface half taper angle alpha and a bit shaft tilt angle beta. The tooth crown is provided with a straight line section on a projection outlet in the direction perpendicular to the axis of a drill column, the straight line section and the axis of a toothed column are intersected to form an included angle theta which is equal to the sum of beta and alpha, and the alpha is not equal to the difference between 90 degrees and beta. When the tooth is arranged at the lower position along with rotation of the roller, the straight line section is perpendicular to the axis of the drill column. No matter the tilt angle beta of the bit shaft of the tooth is equal to zero degree or not, and counter acting force on the tooth from rock is parallel to the axis of the drill column, so that the tooth is guaranteed to be only stressed axially and can axially cut without generating side force, stability of the bit is effectively improved, rock breaking efficiency is high, shift of well holes drilled are reduced or even eliminated, and drilling quality is favorably guaranteed.
Description
Technical field
The utility model relates to drill bit, specifically a kind of tooth of rock bit.
Background technology
Rock bit mainly is made of cone shell and a plurality of teeth of being arranged on cone shell, is a kind of widely used drilling rock stratum instrument.At present, tooth commonly used has chisel teeth, blunt conical-ended shape insert, ball tooth etc., these teeth are grouped into by tooth post part and tooth crown, the tooth post is partly cylindrical, and during installation, tooth post part is inlayed in the perforation of cone shell by interference, and tooth and cone shell are become one, crown part projection is exposed on the cone shell surface, in drilling process, the crown part directly contacts with rock, participates in fractured rock.Thereby the tooth crown separation structure of tooth has determined that directly the exercise performance of rock bit reaches the crushing performance to rock.
The basic rotary structure that adopts of the crown part of above-mentioned tooth commonly used now elaborates with chisel teeth.The chisel teeth crown is partly a frustum of a cone, be symmetrily processed with two inclined-planes at conical surface, form and push up wedge shape narrow, bottom width, the tooth top of crown part is the plane with certain width, addendum line on the tooth top plane is vertical with the tooth mast axis, in drilling process, the tooth top of crown part is the wedging rock at first.Because the tooth cloth tooth surface of cone shell is approximate spherical structure, and the perforation axis on cone shell generally is bordering on vertical with gear wheel cloth tooth surface, make on cone shell to produce the gear wheel cloth flank of tooth semi-cone angle α generation drill bit shaft angle of inclination beta between the tooth mast axis that is arranged in the chisel teeth on cone shell and drill string axis.Like this, in drilling process, the stressed two kinds of situations (referring to Fig. 1) that are divided into of the chisel teeth of arranging on cone shell.one, the drill bit shaft angle of inclination beta of small part chisel teeth equals 0 °, when chisel teeth is in lowest order with the gear wheel rotation, it is parallel that the tooth mast axis of chisel teeth and drill string axis are in, and the addendum line of chisel teeth crown part is vertical with the drill string axis, and rock is parallel to the drill string axis to the reaction force F of chisel teeth, chisel teeth can only axially loaded, can produce lateral force hardly, and then bottom rock is carried out axial cutting, cutting effect is excellent, they are two years old, the drill bit shaft angle of inclination beta of most of chisel teeth is not equal to 0 °, when chisel teeth is in lowest order with the gear wheel rotation, the tooth mast axis of chisel teeth is formed slopely with the drill string axis intersects, the addendum line of chisel teeth crown part also forms to tilt to intersect with the drill string axis, rock just all the time can't be parallel with the drill string axis to the reaction force F of chisel teeth, but be decomposed into the component F1 that is parallel to the drill string axis direction and perpendicular to the component F2 of drill string axis direction, each chisel teeth is parallel to total the pressure of the drill of component F1 balance of drill string axis direction, F2 becomes the suffered lateral force of drill bit, this lateral force acts directly on the borehole wall by drill bit, the borehole wall is formed side cutting, and then cause hole deviation.
We can clearly find out by above-mentioned analysis, in drilling process, the stressed phenomenon that is divided into two kinds of situations of the tooth of arranging on cone shell, determined by tooth crown structure partly, the tooth crown separation structure has a great impact the suffered rock reaction force of whole tooth, and then directly affects the bit cutting direction.
Summary of the invention
The purpose of this utility model is: for the force phenomenon that is subjected to of above-mentioned existing cone shell upper teeth, provide a kind of tooth of rock bit, that this tooth creeps into is stable, efficiency of breaking rock is high, can effectively reduce the lateral force of drill bit.
The technical solution adopted in the utility model is: a kind of tooth of rock bit, comprise tooth post part and crown part, and two parts are overall structure, tooth has characteristic parameter on gear wheel: gear wheel cloth flank of tooth semi-cone angle α, drill bit shaft angle of inclination beta; Described crown part has a straightway in the projected outline perpendicular to the drill string axis direction, this straightway and tooth mast axis intersect the formation angle theta, and its value is θ=β+α, and α is not equal to 90o-β, when tooth was in lowest order with the gear wheel rotation, this straightway was vertical with the drill string axis.
Further, described tooth post part partly tilts with crown and passes through mutually, and the tooth mast axis forms included angle with the crown axes intersect, and its value is φ=90o-(β+α).
the beneficial effects of the utility model are: the crown of above-mentioned tooth partly has the linearly face of section of a projected outline, and when the straight line on this face turns to lowest order at tooth with gear wheel, vertical with the drill string axis, tooth is by this projected outline face wedging rock at first of section linearly, rock is cut, this just makes the drill bit shaft angle of inclination beta of tooth whether no matter equal 0 °, all can make rock be parallel to the drill string axis to the reaction force of tooth, guarantee that tooth can only axially loaded, carry out axial cutting, can not produce lateral force, effectively improved the stability of drill bit, efficiency of breaking rock is high, reduce, even stop to creep into the skew of well, be conducive to guarantee drilling quality.
Description of drawings
Below in conjunction with accompanying drawing, content of the present utility model is further described.
Fig. 1 is the stressed schematic diagram of chisel teeth of arranging on cone shell.
Fig. 2 is a kind of structural representation of the present utility model.
Fig. 3 is another kind of structural representation of the present utility model.
Fig. 4 is the stressed schematic diagram of the utility model of arranging on cone shell.
The specific embodiment
Embodiment 1
Referring to Fig. 2 and Fig. 4: the utility model comprises tooth post part 1 and crown part 2, and two parts are overall structure, and tooth has characteristic parameter on gear wheel: gear wheel cloth flank of tooth semi-cone angle α, drill bit shaft angle of inclination beta.crown part 2 is the wedge shape cone, namely symmetrical cutting has two tapered planes on the cone curved surface, butt is done on the top of cone curved surface to be processed, make the top of crown part 2 have the end face on a plane, new plane of the cut formation of end of crown part 2 end faces, this new plane appears as a straightway 5 from crown part 2 in the projected outline perpendicular to drill string axis 3 directions, this straightway 5 intersects the formation angle theta with tooth mast axis 4, angle theta value=β+α, and α is not equal to 90o-β, when tooth is in lowest order with the gear wheel rotation, this straightway 5 should be vertical with drill string axis 3.like this, no matter whether drill bit shaft angle of inclination beta of the present utility model equals 0 °, in the time of all can making the utility model cut bottom surface, shaft bottom rock, a face of crown part is vertical with the drill string axis, in gear wheel rotary drilling process, on gear wheel, all teeth that cutting bottom surface, shaft bottom rock have a face vertical with the drill string axis, face rock wedging at first by this, and cut, cutting forms bottom rock surface is stepped, rock to the reaction force F of tooth vertically upward, be parallel to the drill string axis, guarantee that tooth can only axially loaded, can not produce lateral force.
Referring to Fig. 3: the other guide of the present embodiment is identical with embodiment 1, difference is: integrally-built crown part 2 has formed the elbow shape on tooth post part 1, be that tooth post part 1 tilts to pass through into mutually overall structure with crown part 2, tooth mast axis 4 intersects the formation included angle with crown axis 6, included angle=90o-(β+α).
The utility model comprises tooth post part and crown part, and two parts are overall structure, and tooth has characteristic parameter on gear wheel: gear wheel cloth flank of tooth semi-cone angle α, drill bit shaft angle of inclination beta.tooth crown is divided into the conisphere shape, the end face that is the crown part is spherical, the cut part of this spherical, form a plane, require this plane to appear as a straightway from the crown part in the projected outline perpendicular to the drill string axis direction, this straightway and tooth mast axis intersect the formation angle theta, angle theta value=β+α, and α is not equal to 90o-β, when tooth is in lowest order with the gear wheel rotation, this projection straight line section should be vertical with the drill string axis, be crown partly the cut plane that processes when the rock of cutting bottom surface, shaft bottom, line on the plane is vertical with the drill string axis.
Embodiment 4
The utility model comprises tooth post part and crown part, and two parts are overall structure, and tooth has characteristic parameter on gear wheel: gear wheel cloth flank of tooth semi-cone angle α, drill bit shaft angle of inclination beta.tooth crown is divided into ladle shape cone, namely be processed with an inner sunken face on the cone curved surface, butt is done on the top of cone curved surface to be processed, make the top of crown part have the end face on a plane, new plane of the cut formation of end of crown part end face, this new plane appears as a straightway from the crown part in the projected outline perpendicular to the drill string axis direction, this straightway and tooth mast axis intersect the formation angle theta, angle theta value=β+α, and α is not equal to 90o-β, when tooth is in lowest order with the gear wheel rotation, this straightway should be vertical with the drill string axis.
The utility model comprises tooth post part and crown part, and two parts are overall structure, and tooth has characteristic parameter on gear wheel: gear wheel cloth flank of tooth semi-cone angle α, drill bit shaft angle of inclination beta.tooth crown is divided into the wedge shape cone, namely symmetrical cutting has two tapered planes on the cone curved surface, butt is done on the top of cone curved surface to be processed, make the top of crown part have the end face on a plane, the cut curved surface that forms an evagination of one end of crown part end face, should appear as a straightway from the crown part in the projected outline perpendicular to the drill string axis direction by outer convex surface, this straightway and tooth mast axis intersect the formation angle theta, angle theta value=β+α, and α is not equal to 90o-β, when tooth is in lowest order with the gear wheel rotation, this straightway should be vertical with the drill string axis, be crown partly the cut outer convex surface that processes when the rock of cutting bottom surface, shaft bottom, the line that is parallel to the curved surface axis on curved surface is vertical with the drill string axis.
Embodiment 6
The utility model comprises tooth post part and crown part, and two parts are overall structure, and tooth has characteristic parameter on gear wheel: gear wheel cloth flank of tooth semi-cone angle α, drill bit shaft angle of inclination beta.tooth crown is divided into the wedge shape cone, namely symmetrical cutting has two tapered planes on the cone curved surface, butt is done on the top of cone curved surface to be processed, make the top of crown part have the end face on a plane, the cut curved surface that forms an indent of one end of crown part end face, this inner sunken face appears as a straightway from the crown part in the projected outline perpendicular to the drill string axis direction, this straightway and tooth mast axis intersect the formation angle theta, angle theta value=β+α, and α is not equal to 90o-β, when tooth is in lowest order with the gear wheel rotation, this straightway should be vertical with the drill string axis, be crown partly the cut inner sunken face that processes when the rock of cutting bottom surface, shaft bottom, the line that is parallel to the curved surface axis on curved surface is vertical with the drill string axis.
Embodiment 7
The utility model has characteristic parameter on gear wheel: gear wheel cloth flank of tooth semi-cone angle α, drill bit shaft angle of inclination beta.The utility model comprises tooth post part and crown part, the crown part has formed the elbow shape on tooth post part, be that tooth post part partly tilts to pass through into mutually overall structure with crown, tooth mast axis and crown axes intersect form included angle, included angle=90o-(β+α).tooth crown is divided into spherical, the end face that is the crown part is spherical, the cut part of this spherical, form a plane, require this plane to appear as a straightway from the crown part in the projected outline perpendicular to the drill string axis direction, this straightway and tooth mast axis intersect the formation angle theta, angle theta value=β+α, and α is not equal to 90o-β, when tooth is in lowest order with the gear wheel rotation, this projection straight line section should be vertical with the drill string axis, be crown partly the cut plane that processes when the rock of cutting bottom surface, shaft bottom, line on the plane is vertical with the drill string axis.
Claims (2)
1. the tooth of a rock bit, comprise tooth post part (1) and crown part (2), and two parts are overall structure, and tooth has characteristic parameter on gear wheel: gear wheel cloth flank of tooth semi-cone angle α, drill bit shaft angle of inclination beta; It is characterized in that, described crown part (2) has a straightway (5) in the projected outline perpendicular to drill string axis (3) direction, this straightway (5) intersects the formation angle theta with tooth mast axis (4), its value is θ=β+α, and α is not equal to 90o-β, when tooth was in lowest order with the gear wheel rotation, this straightway (5) was vertical with drill string axis (3).
2. the tooth of rock bit according to claim 1, is characterized in that, described tooth post part (1) tilts to pass through mutually with crown part (2), and tooth mast axis (4) intersects with crown axis (6) and forms included angle, and its value is φ=90o-(β+α).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220717959 CN203008785U (en) | 2012-12-24 | 2012-12-24 | Tooth of roller bit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220717959 CN203008785U (en) | 2012-12-24 | 2012-12-24 | Tooth of roller bit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203008785U true CN203008785U (en) | 2013-06-19 |
Family
ID=48600392
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220717959 Withdrawn - After Issue CN203008785U (en) | 2012-12-24 | 2012-12-24 | Tooth of roller bit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203008785U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103015900A (en) * | 2012-12-24 | 2013-04-03 | 中国石油化工股份有限公司 | Tooth for roller bits |
-
2012
- 2012-12-24 CN CN 201220717959 patent/CN203008785U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103015900A (en) * | 2012-12-24 | 2013-04-03 | 中国石油化工股份有限公司 | Tooth for roller bits |
| CN103015900B (en) * | 2012-12-24 | 2015-02-04 | 中国石油化工股份有限公司 | Tooth for roller bits |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20130619 Effective date of abandoning: 20150204 |
|
| RGAV | Abandon patent right to avoid regrant |