CN202745697U - Large-aperture underholing drill bit - Google Patents
Large-aperture underholing drill bit Download PDFInfo
- Publication number
- CN202745697U CN202745697U CN 201220307534 CN201220307534U CN202745697U CN 202745697 U CN202745697 U CN 202745697U CN 201220307534 CN201220307534 CN 201220307534 CN 201220307534 U CN201220307534 U CN 201220307534U CN 202745697 U CN202745697 U CN 202745697U
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- CN
- China
- Prior art keywords
- drill bit
- aperture
- underholing
- steel tube
- steel pipe
- 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 discloses a large-aperture underholing drill bit. The ladder-shaped underholing drill bit is formed by welding an upper steel tube and a lower steel tube which are different in diameter underneath a common auger bit, wherein the lower steel tube is provided with an internal thread matched with a drill stem, and the peripheral surfaces of the two steel tubes are respectively welded with 2-4 cutting tool bits; and the aperture of holes drilled out by the cutting tool bits on the lower steel tube is matched with the size of the opposite angles of Pi-shaped steel. The large-aperture underholing drill bit can be used for drilling holes on a coal wall, in which the n-shaped steel is inserted, so that the installation of temporary supports of the Pi-shaped steel is realized.
Description
Technical field
The utility model relates to the drill bit that the face roof supporting is used under the coal mine.
Background technology
Existing colliery high-grade common coal mining face is owing to empty top after the coal cutting is larger, and is complicated at geological structure, the work plane that sub fault is more, in the situation that safeguard the untimely easy immediate roof inbreak phenomenon that occurs, height is generally about 1.2 meters.Be to strengthen Roof Control, guarantee stability of cavern roof, reduce the roof fall probability, need to insert rib with π shaped steel and carry out temporary lining, be sought after a kind of at large aperture drill bit that rib is holed for this reason.
Summary of the invention
Insert the problem of rib for solving π shaped steel, the utility model has designed a kind of large aperture slotting drill bit.
Concrete technical scheme is, a kind of large aperture slotting drill bit, it is welded with the steel pipe of upper and lower two joint different-diameters below a common spiral bit, lower joint steel pipe is provided with the internal thread supporting with drilling rod, weld respectively upper 2-4 cutter tip on the side face of two joint steel pipes, thereby consist of stepped slotting drill bit, wherein the aperture that gets out of lower joint and the diagonal-size of π shaped steel are complementary.
The utility model has the advantages that: adopt this drill bit to plug boring into π shaped steel at rib, realized the installation work of π shaped steel temporary lining.
Description of drawings
Fig. 1 is the front view of the utility model embodiment.
Among the figure: the common spiral bit of 1-, the upper joint of 2-steel pipe saves steel pipe under the 3-, the 4-cutter tip.
The aperture that the lower joint steel pipe of A representative cutter tip gets out.
The specific embodiment
As shown in Figure 1, a kind of large aperture slotting drill bit, it is welded with upper joint steel pipe 2 and the lower joint steel pipe 3 of different-diameter below a common spiral bit 1, lower joint steel pipe 3 is provided with the internal thread supporting with drilling rod, be welded with respectively 2-4 cutter tip 4 on the side face of upper joint steel pipe 2 and lower joint steel pipe 3, thereby consist of stepped slotting drill bit, wherein the aperture a that gets out of lower joint steel pipe 3 cutter tips and the diagonal-size of π shaped steel are complementary.
Claims (1)
1. large aperture slotting drill bit, it is characterized in that, it is welded with the steel pipe of upper and lower two joint different-diameters below a common spiral bit, lower joint steel pipe is provided with the internal thread supporting with drilling rod, weld respectively upper 2-4 cutter tip on the side face of two joint steel pipes, thereby consist of stepped slotting drill bit, wherein the aperture that gets out of lower joint and the diagonal-size of π shaped steel are complementary.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220307534 CN202745697U (en) | 2012-06-28 | 2012-06-28 | Large-aperture underholing drill bit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220307534 CN202745697U (en) | 2012-06-28 | 2012-06-28 | Large-aperture underholing drill bit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202745697U true CN202745697U (en) | 2013-02-20 |
Family
ID=47705114
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220307534 Expired - Fee Related CN202745697U (en) | 2012-06-28 | 2012-06-28 | Large-aperture underholing drill bit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202745697U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108316932A (en) * | 2018-04-23 | 2018-07-24 | 山西坤谷矿山装备科技有限公司 | The quick slotting device of stone drifting large pore keyhole |
| CN110777062A (en) * | 2019-11-27 | 2020-02-11 | 中国热带农业科学院热带生物技术研究所 | Inoculator for cassava common mosaic virus |
-
2012
- 2012-06-28 CN CN 201220307534 patent/CN202745697U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108316932A (en) * | 2018-04-23 | 2018-07-24 | 山西坤谷矿山装备科技有限公司 | The quick slotting device of stone drifting large pore keyhole |
| CN108316932B (en) * | 2018-04-23 | 2023-12-15 | 山西坤谷矿山装备科技有限公司 | Quick cutting device for large-aperture cut hole in rock drift tunneling |
| CN110777062A (en) * | 2019-11-27 | 2020-02-11 | 中国热带农业科学院热带生物技术研究所 | Inoculator for cassava common mosaic virus |
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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: 20130220 Termination date: 20150628 |
|
| EXPY | Termination of patent right or utility model |