CN201851015U - Composite bearing-based mine three-cone drill head - Google Patents
Composite bearing-based mine three-cone drill head Download PDFInfo
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- CN201851015U CN201851015U CN2010201420426U CN201020142042U CN201851015U CN 201851015 U CN201851015 U CN 201851015U CN 2010201420426 U CN2010201420426 U CN 2010201420426U CN 201020142042 U CN201020142042 U CN 201020142042U CN 201851015 U CN201851015 U CN 201851015U
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- roller
- bearing
- axle journal
- gear wheel
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Abstract
The utility model relates to a composite bearing-based mine three-cone drill head. The drill head has the technical scheme that the diameter of the shaft neck of a roller bearing and the diameter of a lug boss between the shaft neck of the roller bearing and the shaft neck (5) of a ball bearing are unified to form into a cylindrical large shaft neck (4); the specified size of the diameter d of the large shaft neck (4) is as the same at that of the diameter D of a large circular hole (9) of a toothed wheel (2) to form into a sliding bearing; and the inner wall of a large circular hole of the toothed wheel (2) is evenly provided with 6-13 pin roller grooves (8), each pin roller groove (8) is internally and respectively provided with a pin roller (3), and the pin rollers (3), the pin roller grooves (8) and the large shaft neck (4) form into a rolling bearing. The shaft neck (5) of the ball bearing is provided with a ball (6), and a small shaft neck (7) is provided with the sliding bearing or the rolling bearing. Therefore, the contact stress of the large shaft neck (4) can be greatly reduced, the carrying capacity of the large shaft neck (4) can be improved, the structural strength and the carrying capacity of the toothed wheel (2) can be increased, and the service life of the mine three-cone drill head can be prolonged.
Description
Technical field
The utility model belongs to the mining cone bit technical field, is specifically related to a kind of blasthole tricone rock bit based on composite bearing.
Background technology
In the blasthole tricone rock bit operation process, the pressure of the drill of tens of tons acts on the drill bit, bearing radial load in the bearing arrangement of drill bit is made of three road bearings, be respectively: the roller bearing that the big hole of roller bearing axle journal, roller and the gear wheel of (1) tooth pawl is formed, bearing about 80% of radial load; (2) ball bearing is formed in the ball bearing hole of ball bearing axle journal, ball and the gear wheel of tooth pawl, mainly plays locking gear wheel and tooth pawl, also is being subjected to about 5% of radial load simultaneously; (3) pilot pin of tooth pawl and be embedded in sliding bearing that the lining on the aperture of gear wheel forms or rolling bearing that the aperture of the pilot pin of tooth pawl and little roller and gear wheel is formed is bearing about 15% of radial load.
Because gear claw journal is fixed by force direction, gear wheel rotates round gear claw journal by roller, ball and the sliding bearing or the rolling bearing that are contained in the pilot pin place of tooth pawl, the roller bearing axle journal of tooth pawl participates in the area minimum of wearing and tearing, the contact stress of roller on its maximum weighted direction is very big, with the KX-74-250 blasthole tricone rock bit is example, the contact stress of roller bearing axle journal on the maximum weighted direction of tooth pawl can reach more than the 1600Mpa, so the roller bearing axle journal of existing structure dens in dente pawl is weak part.Dissect diameter that the inefficacy drill bit records the roller bearing axle journal of the tooth pawl 3～7mm that worn and torn on the maximum weighted direction, the roller uniform wear makes diameter reduce by 1～2mm, and the big hole uniform wear of gear wheel makes diameter reduce by 0.3～0.5mm.Because the roller bearing axle journal of tooth pawl is subjected to heavy wear, has increased the gap of roller bearing greatly, causes roller crooked operation to occur and causes drill bit to scrap until stuck gear wheel.
The data of analytic statistics shows: the mining cone bit failure reasons, be due to the initial failure of bearing about 80%, the initial failure of the roller bearing axle journal of its dens in dente pawl accounts for about 75%, so the contact stress that reduces on the roller bearing axle journal that acts on the tooth pawl from structure is the key that improves bit life.
Summary of the invention
The utility model is intended to overcome the prior art defective, purpose provides a kind of contact stress that can reduce the roller bearing axle journal of tooth pawl significantly, improve the supporting capacity of the roller bearing axle journal of tooth pawl, increase gear wheel structural strength and supporting capacity, can improve the blasthole tricone rock bit based on composite bearing in application life.
For achieving the above object, the technical solution adopted in the utility model is: comprise three gear wheels, three tooth pawls; Be fixed with gear claw journal respectively on each tooth pawl, three gear wheels are installed in respectively on three gear claw journals, each gear claw journal is formed by roller bearing axle journal, ball bearing axle journal and pilot pin, and ball is equipped with at the place at the ball bearing axle journal, at the pilot pin place sliding bearing or rolling bearing is housed; It is characterized in that:
(1) diameter of roller bearing axle journal and the diameter of the boss between roller bearing axle journal and the ball bearing axle journal are unified, promptly constitute cylindrical big axle journal, the nominal size of big axle journal diameter d is identical with the nominal size of the big hole diameter D of gear wheel, the axial length L of the big hole of gear wheel equals the axial length L 2 of big axle journal, and the big hole of gear wheel constitutes sliding bearing with big axle journal;
(2) inwall at the big hole of gear wheel has 6～13 roller slots equably, and roller is housed respectively in each roller slot, and roller, roller slot and big axle journal constitute rolling bearing.
In technique scheme: the arc radius R of roller slot is more than or equal to the radius r of roller, the center of circle of roller slot arc radius R is evenly distributed in the D1/2 place with the concentric gear wheel of the big hole of gear wheel, D1 is the diameter of a circle that the center of circle constituted of roller slot arc radius R, and the nominal size of D1 is:
D1＝D+4r-2R
Wherein: D is the big hole diameter of gear wheel;
R is the arc radius of roller slot;
R is the radius of roller.
The width E=2R of roller slot, the axial length L 1 of roller slot is than the little 3～15mm of axial length L of the big hole of gear wheel, i.e. L-L1=3～15mm.
Owing to adopt technique scheme, the utility model has roller slot at the inwall of the big hole of gear wheel, roller is placed in the roller slot, roller slot, roller and big axle journal constitute rolling bearing, the big hole inwall of gear wheel constitutes sliding bearing with big axle journal, and both constitute the composite bearing structure that rolls and slide.
Therefore, the utlity model has following remarkable result:
1, adopts roller slot, can restrict the caused stuck gear wheel accident of the crooked operation of roller effectively;
2, increase big axle journal diameter and length, can reduce the contact stress that acts on the big axle journal stress surface significantly, and improve its supporting capacity;
3, the inwall at the big hole of gear wheel has roller slot equably, and this structure has strengthened the structural strength and the supporting capacity of gear wheel;
4, the big hole of big axle journal, roller slot, roller and gear wheel has constituted the composite bearing structure that existing rolling has slip again, can significantly improve the application life of blasthole tricone rock bit.
The utility model is widely used in the rock bit of using in mining, well and the geological drilling.
Description of drawings
Fig. 1 is that the utility model is with a tooth pawl 1 and a kind of structural representation that gear wheel 2 is an example;
Fig. 2 is the gear claw journal schematic diagram among Fig. 1;
Fig. 3 is the generalized section of the A-A direction among Fig. 1;
Fig. 4 is that gear wheel 2 among Fig. 1 is in the generalized section of B-B direction;
Fig. 5 is the local enlarged diagram of gear wheel 2, roller slot 8, roller 3 and big axle journal 4 among Fig. 3;
Fig. 6 is that gear wheel 2 among Fig. 4 is in the generalized section of C-C direction.
The specific embodiment
The utility model will be further described below in conjunction with the drawings and specific embodiments, is not the restriction to its protection domain:
A kind of blasthole tricone rock bit based on composite bearing.Comprise three gear wheels 2 and three tooth pawls 1; As shown in Figure 1, be fixed with gear claw journal respectively on each tooth pawl 1, three gear wheels 2 are contained in respectively on three gear claw journals, each gear claw journal is formed by roller bearing axle journal, ball bearing axle journal 5 and pilot pin 7, ball 6 is equipped with at ball bearing axle journal 5 places, and sliding bearing or rolling bearing are equipped with in pilot pin 7 places.
Present embodiment is with the diameter unification of the diameter and the boss between roller bearing axle journal and the ball bearing axle journal 5 of the roller bearing axle journal of prior art, promptly constitute cylindrical big axle journal 4, as shown in Figure 2, the nominal size of big axle journal 4 diameter d is identical with the nominal size of the big hole 9 diameter D of gear wheel 2, and the axial length L of the big hole 9 of gear wheel 2 equals the length L 2 of big axle journal 4; The big hole 9 of gear wheel 2 as shown in Figure 4 and big axle journal 4 formations sliding bearing as shown in figures 1 and 3.The big hole 9 of gear wheel 2 is as Fig. 4 and shown in Figure 6, and wall is equipped with roller 3 along having 11 roller slots 8 equably respectively in each roller slot 8 within it, and roller 3, roller slot 8 and big axle journal 4 constitute rolling bearing.
In the present embodiment: roller slot 8 as shown in Figure 4, the width E=2R of roller slot 8; The arc radius R of roller slot 8 is as shown in Figure 5 greater than the radius r of roller 3; The center of circle of the arc radius R of roller slot 8 is evenly distributed in the D1/2 place with the concentric gear wheel 2 of the big hole 9 of gear wheel 2 as shown in Figure 4, and D1 is the diameter of a circle that the center of circle constituted of roller slot 8 arc radius R, and the nominal size of D1 is:
D1＝D+4r-2R
Wherein: D is the diameter of the big hole 9 of gear wheel 2;
R is the arc radius of roller slot 8;
R is the radius of roller 3.
As shown in Figure 6, the axial length L 1 of roller slot 8 is than the little 10mm of axial length L of the big hole 9 of gear wheel 2, i.e. L-L1=10mm.
A kind of blasthole tricone rock bit based on composite bearing.Big hole 9 inwalls of gear wheel 2 have 6～10 roller slots 8 equably, and the axial length L 1 of roller slot 8 is than the little 3～10mm of axial length L of the great circle macropore 9 of gear wheel 2, i.e. L-L1=3～10mm.
All the other are with embodiment 1.
A kind of blasthole tricone rock bit based on composite bearing.The inwall of the big hole 9 of gear wheel 2 has 12～13 roller slots 8 equably, and the axial length L 1 of roller slot 8 is than the little 10～15mm of axial length L of the big hole 9 of gear wheel 2, i.e. L-L1=10～15mm.
All the other are with embodiment 1.
This specific embodiment has roller slot 8 at the inwall of the big hole of gear wheel 2, and roller 3 is placed in the roller slot 8, and roller 3, roller slot 8 and big axle journal 4 constitute rolling bearing; The inwall of the big hole 9 of gear wheel 2 constitutes sliding bearing with big axle journal 4, and both constitute the composite bearing structure that rolls and slide.
Therefore, this specific embodiment has following remarkable result:
1, adopts roller slot 8, can restrict the caused stuck gear wheel accident of roller 3 crooked operations effectively;
2, increase the diameter and the length of big axle journal 4, can reduce the contact stress that acts on big axle journal 4 stress surfaces significantly, and improve its supporting capacity;
3, big hole 9 inwalls at gear wheel 2 have roller slot 8, and shape is the plum blossom lobe as shown in Figure 4, and this structure has strengthened the structural strength and the supporting capacity of gear wheel 2;
4, the big hole 9 of big axle journal 4, roller slot 8, roller 3 and gear wheel 2 has constituted the composite bearing structure that existing rolling has slip again, can significantly improve the application life of blasthole tricone rock bit.
This specific embodiment is widely used in the rock bit of using in mining, well and the geological drilling.
Claims (3)
1. the blasthole tricone rock bit based on composite bearing comprises three gear wheels (2), three tooth pawls (1); Be fixed with gear claw journal respectively on each tooth pawl (1), three gear wheels (1) are installed in respectively on three gear claw journals, each gear claw journal is formed by roller bearing axle journal, ball bearing axle journal (5) and pilot pin (7), locate to be equipped with ball (6) at ball bearing axle journal (5), locate to be equipped with sliding bearing or rolling bearing at pilot pin (7); It is characterized in that: (1) promptly constitutes cylindrical big axle journal (4) with the diameter unification of the diameter and the boss between roller bearing axle journal and the ball bearing axle journal (5) of roller bearing axle journal; The nominal size of big axle journal (4) diameter d is identical with the nominal size of big hole (9) the diameter D of gear wheel (2), the axial length L of the big hole (9) of gear wheel (2) equals the axial length L 2 of big axle journal (4), and the big hole (9) of gear wheel (2) constitutes sliding bearing with big axle journal 4;
(2) inwall at the big hole (9) of gear wheel (2) has 6～13 roller slots (8) equably, and roller (3) is housed respectively in each roller slot (8), and roller (3), roller slot (8) and big axle journal (4) constitute rolling bearing.
2. the blasthole tricone rock bit based on composite bearing according to claim 1, it is characterized in that the radius r of the arc radius R of described roller slot (8) more than or equal to roller (3), the center of circle of the arc radius R of roller slot (8) is evenly distributed in the D1/2 place with the concentric gear wheel (2) of the big hole (9) of gear wheel (2), D1 is the diameter of a circle that the center of circle constituted of roller slot (8) arc radius R, and the nominal size of D1 is:
D1＝D+4r-2R
Wherein: D is the big hole 9 of gear wheel (2)) diameter;
R is the arc radius of roller slot (8);
R is the radius of roller (3).
3. the blasthole tricone rock bit based on composite bearing according to claim 1 and 2, the width E=2R that it is characterized in that described roller slot (8), the axial length L 1 of roller slot (8) is than the little 3～15mm of axial length L of the big hole (9) of gear wheel (2), i.e. L-L1=3～15mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201420426U CN201851015U (en) | 2010-03-23 | 2010-03-23 | Composite bearing-based mine three-cone drill head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201420426U CN201851015U (en) | 2010-03-23 | 2010-03-23 | Composite bearing-based mine three-cone drill head |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201851015U true CN201851015U (en) | 2011-06-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010201420426U Expired - Fee Related CN201851015U (en) | 2010-03-23 | 2010-03-23 | Composite bearing-based mine three-cone drill head |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201851015U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101832106A (en) * | 2010-03-23 | 2010-09-15 | 武汉科技大学 | Mining tricone bit based on roller composite bearing |
| CN103075106A (en) * | 2013-01-11 | 2013-05-01 | 西南石油大学 | Hollow rolling and sliding composite bearing for rock bit |
-
2010
- 2010-03-23 CN CN2010201420426U patent/CN201851015U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101832106A (en) * | 2010-03-23 | 2010-09-15 | 武汉科技大学 | Mining tricone bit based on roller composite bearing |
| CN103075106A (en) * | 2013-01-11 | 2013-05-01 | 西南石油大学 | Hollow rolling and sliding composite bearing for rock bit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110601 Termination date: 20150323 |
|
| EXPY | Termination of patent right or utility model |