CN2784571Y - Wedgy heel ball tooth - Google Patents
Wedgy heel ball tooth Download PDFInfo
- Publication number
- CN2784571Y CN2784571Y CN 200520068871 CN200520068871U CN2784571Y CN 2784571 Y CN2784571 Y CN 2784571Y CN 200520068871 CN200520068871 CN 200520068871 CN 200520068871 U CN200520068871 U CN 200520068871U CN 2784571 Y CN2784571 Y CN 2784571Y
- Authority
- CN
- China
- Prior art keywords
- wedge
- ball tooth
- tooth
- shape
- limit ball
- 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 - Fee Related
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Abstract
The utility model belongs to the field of hard alloy products, ball tooth bit heads and in-hole hammers, particularly an edge ball tooth with a wedge-shaped circular table body. According to the design scheme provided by the utility model, the cylinder of the edge ball tooth is provided with the transitional wedge-shaped circular table body. The upper end of the wedge-shaped circular table body is provided with an impact head. The impact head has the shape that the lower part of the impact head can be in the shape of a circular table and the upper part can be in the shape of a spherical surface. The shape of the impact head can also be made into a spherical crown shape or a parabolic surface shape. The wedge angle alpha of the wedge-shaped circular table body is equal to or near to an included angle alpha 1 between an edge toothed hole central line on a bit head body and the shaft line of the bit head body. The alpha is between 20 DEG and 45 DEG. The bottom angle beta of the circular table body is bigger than 60 DEG and smaller than 90 DEG. The utility model can change the shape of the upper part of the edge tooth, correspondingly increase the quantity specific gravity of the hard materials at the outer side of the edge tooth and improve the stressed state of the edge tooth, which is favorable for the diameter assurance of the bit head and the prolongation of the service life of the bit head.
Description
Technical field
The utility model belongs to hard metal article and spherical tooth drill bit, down-the-hole hammer field, specifically a kind of limit ball tooth that has the wedge-like Rotary-table.
Background technology
At present, the spherical tooth drill bit that on impact drilling and drilling project, uses, down-the-hole hammer, its hard-metal insert generally adopts the ball tooth.The mounting means of its middle tooth is vertically to be embedded in bore bit body or the down-the-hole hammer body; And an angle of slope is all arranged between its heel teeth centerline hole and bore bit body or down-the-hole hammer body axis, greatly between 20～45 degree.In the use, the outer lateral wearing of limit ball tooth on bore bit, the down-the-hole hammer is faster, and this is the one of the main reasons that causes bore bit, down-the-hole hammer to lose efficacy.
Summary of the invention
The purpose of this utility model is to design a kind of wedge inclined limit ball tooth, to prolong the application life of bore bit, down-the-hole hammer.
According to design scheme provided by the utility model, a cambic wedge-like Rotary-table is set on the cylinder of limit ball tooth, be the impact head in the upper end of wedge-like Rotary-table.
The shape of impacting head can be round platform for the bottom, and top is sphere.Can be spherical crown shape or parabolic shape also with the shaped design of impacting head.The locking angle of wedge-like Rotary-table equals or is similar to heel teeth centerline hole on the bore bit body and the angle α 1 between the bore bit body axis, and α is between 20～45 degree; Base angle 60＜the β of Rotary-table＞90 degree.
Limit ball tooth is embedded in the heel teeth hole of bore bit body or down-the-hole hammer body, and the angle of wedge of limit ball tooth is towards the outer direction of bore bit or down-the-hole hammer.40 millimeters of the nominal diameter φ 6～φ of limit ball tooth.
The utility model has the advantages that: owing on the cylinder of existing limit ball tooth, design a cambic wedge-like Rotary-table, its angle of wedge equals or is similar to the angle of heel teeth hole to the bore bit axis, thereby make ball tooth top, limit the axis bending angle, on the wedge-like Rotary-table, increase a round platform and sphere again, do not changing former bore bit body heel teeth orifice angle, under the situation of position, be embedded in the heel teeth hole wedge inclined limit ball tooth is directive, the angle of wedge should be towards the outer direction of bore bit, and the axis on ball tooth top, limit and bore bit body axis (being the direction of impact drilling) are for equidirectional.Like this, both improved the force-bearing situation of limit ball tooth, and reduced the shearing force influence, the proportion of the amount of the simultaneously corresponding hard material that has increased the ball tooth outside, limit produces the effect of " seamed edge ".Help the guarantor footpath of bore bit and the application life of prolongation bore bit.
Description of drawings
Fig. 1 is wedge inclined limit ball toothing figure.
Fig. 2 is that wedge inclined limit ball tooth is installed on the structure chart on bore bit body or the down-the-hole hammer body.
The specific embodiment
As shown in the figure: a cambic wedge-like Rotary-table 3 is set on the cylinder 4 of limit ball tooth 5, is the impact head in the upper end of wedge-like Rotary-table 3.The described bottom that is shaped as of impacting head is round platform 2, and top is sphere 1, and in addition, the shape of impacting head also can be spherical crown shape or parabolic shape.Limit ball tooth 5 is embedded in the heel teeth hole of bore bit body 6 or down-the-hole hammer body 6, and the angle of wedge of limit ball tooth 5 is towards the outer direction of bore bit or down-the-hole hammer.Owing to impacting the wedge-like Rotary-table 3 that is provided with a band tapering between head and cylinder, during use, the center line that impacts head is parallel with the axis of bore bit body 6 or down-the-hole hammer body 6, thereby increased the proportion of the amount of the hard material outside the ball tooth of limit, and improved the force-bearing situation of heel teeth, the guarantor footpath that helps bore bit body 6 or down-the-hole hammer body 6 with increase the service life.
The locking angle of wedge-like Rotary-table 3 equals or is similar to heel teeth centerline hole on the bore bit body 6 and the angle α 1 between bore bit body 6 axis, and α is between 20～45 degree, and is parallel with the axis of bore bit body 6 or down-the-hole hammer body 6 with the center line of guaranteeing to install back ball tooth 5; Base angle 60＜the β of Rotary-table 3＞90 degree, 40 millimeters of the nominal diameter φ 6～φ of limit ball tooth 5.
Claims (6)
1, wedge inclined limit ball tooth is characterized in that: a cambic wedge-like Rotary-table is set on the cylinder of limit ball tooth, is the impact head in the upper end of wedge-like Rotary-table.
2, wedge inclined according to claim 1 limit ball tooth is characterized in that: the bottom that is shaped as of impacting head is round platform, and top is sphere.
3, wedge inclined according to claim 1 limit ball tooth is characterized in that: that impacts head is shaped as spherical crown shape or parabolic shape.
4, wedge inclined according to claim 1 limit ball tooth is characterized in that: the locking angle of wedge-like Rotary-table equals or is similar to heel teeth centerline hole on the bore bit body and the angle α 1 between the bore bit body axis, and α is between 20～45 degree; Base angle 60＜the β of Rotary-table＞90 degree.
5, wedge inclined according to claim 1 limit ball tooth, it is characterized in that: limit ball tooth is embedded in the heel teeth hole of bore bit body or down-the-hole hammer body, and the angle of wedge of limit ball tooth is towards the outer direction of bore bit or down-the-hole hammer.
6, wedge inclined according to claim 1 limit ball tooth is characterized in that: 40 millimeters of the nominal diameter φ 6～φ of limit ball tooth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520068871 CN2784571Y (en) | 2005-01-31 | 2005-01-31 | Wedgy heel ball tooth |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520068871 CN2784571Y (en) | 2005-01-31 | 2005-01-31 | Wedgy heel ball tooth |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2784571Y true CN2784571Y (en) | 2006-05-31 |
Family
ID=36771546
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520068871 Expired - Fee Related CN2784571Y (en) | 2005-01-31 | 2005-01-31 | Wedgy heel ball tooth |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2784571Y (en) |
-
2005
- 2005-01-31 CN CN 200520068871 patent/CN2784571Y/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20060531 |