CN213540268U - Hard alloy down-the-hole drill bit - Google Patents
Hard alloy down-the-hole drill bit Download PDFInfo
- Publication number
- CN213540268U CN213540268U CN202022735980.3U CN202022735980U CN213540268U CN 213540268 U CN213540268 U CN 213540268U CN 202022735980 U CN202022735980 U CN 202022735980U CN 213540268 U CN213540268 U CN 213540268U
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- CN
- China
- Prior art keywords
- drill bit
- hole
- screw thread
- counter bore
- drillstock
- 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
Links
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 21
- 239000000956 alloy Substances 0.000 title claims abstract description 21
- 229910003460 diamond Inorganic materials 0.000 claims description 11
- 239000010432 diamond Substances 0.000 claims description 11
- 239000000843 powder Substances 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 229910001080 W alloy Inorganic materials 0.000 claims description 5
- 239000011159 matrix material Substances 0.000 claims description 3
- 235000010599 Verbascum thapsus Nutrition 0.000 claims description 2
- 244000178289 Verbascum thapsus Species 0.000 claims description 2
- 238000007599 discharging Methods 0.000 claims 2
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000005553 drilling Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 238000009713 electroplating Methods 0.000 description 4
- 239000011435 rock Substances 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- 229910000851 Alloy steel Inorganic materials 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000010146 3D printing Methods 0.000 description 1
- 229910017709 Ni Co Inorganic materials 0.000 description 1
- 229910003267 Ni-Co Inorganic materials 0.000 description 1
- 229910003262 Ni‐Co Inorganic materials 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000005641 tunneling Effects 0.000 description 1
Images
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- Earth Drilling (AREA)
Abstract
The utility model discloses a carbide down-the-hole drill bit, including drill bit portion, drillstock portion, carbide tooth and stop pin, the tail end of drill bit portion is equipped with the screw thread counter bore, be equipped with on the working face of drillstock portion front end with the mounting hole of screw thread counter bore intercommunication, the mounting hole is the big circular cone hole of the little tail end of front end, the carbide tooth matches and installs in the mounting hole, the drillstock portion matches and inserts in the screw thread counter bore and sticis the carbide tooth, the stop pin is followed drill bit portion packs into and wears on drillstock portion and the drillstock portion. When the hard alloy teeth of the drill bit are damaged or seriously worn, the whole drill bit does not need to be replaced, and only the corresponding hard alloy teeth need to be replaced, so that the production cost is greatly reduced.
Description
Technical Field
The utility model relates to a down-the-hole drill bit especially relates to a carbide down-the-hole drill bit.
Background
The hard alloy down-the-hole drill bit is used as a matched product of a high-power rock drill, is mainly used in engineering tunneling construction of tunnels, underground mining, surface mines, quarries and the like, and has higher and higher requirements on fracture resistance, fatigue fracture resistance, toughness and wear resistance in the working process. The hard alloy teeth and the drill bit on the working surface are formed by injection molding, when the hard alloy teeth and the drill bit drill rock are high in hardness, the abrasion of the alloy teeth is serious, and after the hard alloy teeth are abraded and cannot be used, the whole drill bit can be scrapped and cannot be used continuously, so that the rejection rate of the drill bit is greatly increased, and the number of the drill bits consumed in the whole drilling process is large, and the production cost is wasted. And the working surface of the drill bit is seriously insufficient in performances such as wear resistance and the like, the working surface of the drill bit is quickly worn in the working process, and hard alloy spherical teeth are easy to fall off, so that the service life of the drill bit is shortened, and the drilling efficiency of the drill bit is reduced.
SUMMERY OF THE UTILITY MODEL
A primary object of the present invention is to provide a cemented carbide down-the-hole drill bit, which can be used for drilling a hole in a workpiece without the need of replacing the whole drill bit, and can be used for drilling a hole in a workpiece without the need of replacing the corresponding cemented carbide teeth.
In order to solve the technical problem, the utility model adopts the following technical scheme:
the utility model provides a carbide down-the-hole drill bit, includes drill bit portion, drillstock portion, carbide tooth and stop pin, the tail end of drillstock portion is equipped with the screw thread counter bore, be equipped with on the working face of drillstock portion front end with the mounting hole of screw thread counter bore intercommunication, the mounting hole is the big taper hole of the little tail end of front end, the carbide tooth matches and installs in the mounting hole, the drillstock portion matches and inserts in the screw thread counter bore and sticiss the carbide tooth, the stop pin is followed the drill bit portion is packed into and is worn on drillstock portion and the drillstock portion.
Specifically, the working surface of the front end of the drill bit part is provided with a diamond-impregnated layer.
Specifically, the thickness of the impregnated diamond layer is controlled to be 0.5-5 mm.
Specifically, the matrix impregnated with the diamond layer is made of Ni-W alloy.
Specifically, a plug is arranged in a threaded hole on the drill bit part for mounting the locking pin.
Specifically, a plurality of powder discharge grooves are arranged on the outer edge of the drill bit part at intervals.
Specifically, the inner wall of the threaded counter bore is provided with internal threads, and the drill bit part is in threaded fastening connection with the threaded counter bore.
Specifically, a through water channel is arranged in the drill stem part, a plurality of inclined water channels are arranged in the drill head part, the through water channel is communicated with the inclined water channels, a water outlet of the inclined water channels is located on the working face, inclined hole water channels are arranged on the working face, and the inclined hole water channels are communicated between the powder discharge groove and the water outlet.
Compared with the prior art, the utility model discloses the beneficial effect who has lies in: the mounting hole on carbide tooth and the drill bit portion adopts the circular conical surface cooperation, the drillstock portion compresses tightly the carbide tooth with drill bit portion screw thread fastening connection and fixes in the mounting hole, the drillstock portion passes through the stop pin and realizes the circumference location with the drill bit portion, if the carbide tooth takes place to damage or when wearing and tearing serious the condition, stop drill bit work, extract the stop pin through pulling out the round pin ware, screw out the drillstock portion from the screw thread counter bore, the carbide tooth that will need to be changed withdraws from the tail end of mounting hole, it can to change new carbide tooth, compared with the prior art, need not change whole drill bit, manufacturing cost has significantly reduced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic structural view of a cemented carbide down-the-hole drill provided by an embodiment of the present invention;
FIG. 2 is a schematic top view of a cemented carbide down-the-hole drill bit according to an embodiment of the present invention;
FIG. 3 is a schematic cross-sectional view of a cemented carbide down-the-hole drill bit according to an embodiment of the present invention;
wherein: 1-a drill head; 2-a drill shank portion; 3-hard alloy teeth; 4-a locking pin; 5-plug; 6-impregnated diamond layer; 7-powder discharge groove; 8-straight-through water channel; 9-inclined water passage; 10-inclined hole water channel.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Referring to fig. 1-3, a hard alloy down-the-hole drill bit comprises a drill bit portion 1, a drill stem portion 2, hard alloy teeth 3 and a locking pin 4, wherein a thread counter bore is formed in the tail end of the drill bit portion 1, a mounting hole communicated with the thread counter bore is formed in the working surface of the front end of the drill bit portion 1, the mounting hole is a conical hole with a small front end and a large tail end, the hard alloy teeth 3 are mounted in the mounting hole in a matched mode, external threads are formed in the outer wall of the connecting end of the drill stem portion 2 and the drill bit portion 1, the drill stem portion is fixedly screwed to the thread counter bore and then tightly presses the hard alloy teeth 3, the hard alloy teeth 3 are tightly pressed and fixedly mounted in the mounting hole, the locking pin 4 is perpendicularly mounted from the side portion of the drill bit portion 1 to penetrate through the drill bit portion 1 and the drill stem portion 2, circumferential positioning of. In order to prevent the locking pin 4 from falling off and impurities from blocking the threaded hole at the tail of the locking pin 4, a plug 5 is mounted in the threaded hole of the drill bit 1 to which the locking pin 4 is mounted.
In this embodiment, if carbide tooth 3 takes place to damage or when wearing and tearing are serious, stop drill bit work, extract locking pin 4 through the pin puller, withdraw from shank portion 2 in the screw thread counter bore, carbide tooth 3 that will change withdraws from the tail end of mounting hole, it can to change new carbide tooth 3, adopt the circular conical surface cooperation because of carbide tooth 3 and the mounting hole on the drill bit portion 1, the fitting surface is short during the dismantlement, only need overcome initial adhesive force and can easily pull down carbide tooth 3, compare with prior art, need not change whole drill bit, and the cost is saved.
Referring to fig. 1-3, it should be explained that, in practical application, the working surface at the front end of the drill bit portion 1 may further be provided with a diamond-impregnated layer 6, the drill bit portion 1 may be made of alloy steel, the diamond-impregnated layer 6 may be coated on the drill bit portion 1 made of alloy steel by electroplating, fused deposition or laser 3D printing, the front end of the cemented carbide tooth 3 is a spherical crown face, the diamond-impregnated layer 6 is impregnated with natural diamond or thermally stable artificial polycrystalline diamond, and after adopting this structure, the novel cemented carbide down-the-hole drill bit is provided with the cemented carbide teeth 3, which has the function of cutting and breaking rock, so the mechanical drilling speed is high. And the hard alloy teeth 3 are fixed in the diamond-impregnated layer 6, the diamond-impregnated layer 6 can protect the hard alloy teeth 3 to the maximum extent, the hard alloy teeth 3 can be ensured to work under the normal abrasion condition as far as possible, the breaking phenomenon is reduced, the service life can be effectively prolonged, and the footage can be effectively improved. Meanwhile, the diamond-impregnated layer 6 contains a large number of diamond particles, so that the ploughing effect is achieved, the diamond content of the drill bit is increased, and the footage and the service life of the drill bit are further improved.
In the practical design, the thickness of the diamond-impregnated layer 6 coated on the working surface of the drill bit part 1 is 0.5-5 mm, the volume fraction of the Ni-W alloy is 70-95%, the volume fraction of the diamond is 5-30%, the diamond granularity is 0.5mm, and the Ni-W alloy diamond-impregnated layer 6 is plated by adopting a pulse electroplating method. The matrix of the diamond-impregnated layer 6 is made of Ni-W alloy, compared with Ni-Co base alloy and the like, the wear-resisting property of the coating is stronger, the wear-resisting capability of the bit 1 position of the drill bit part is improved, the pulse electroplating method is adopted, compared with the direct current electroplating method, the binding force of the coating and the library body is improved, the impact resistance of the Ni-W base diamond-impregnated layer 6 is improved, the wear-resisting capability of the drill bit part 1 is greatly improved, the service life of the drill bit is prolonged, and the drilling efficiency of the drill bit is improved.
Referring to fig. 1-3, specifically, a plurality of powder discharge grooves 7 are arranged at intervals on the outer edge of the drill bit part 1, a straight-through water channel 8 is arranged inside the drill bit part 2, a plurality of inclined water channels 9 are arranged inside the drill bit part 1, the straight-through water channel 8 is communicated with the inclined water channels 9, and a water outlet of the inclined water channels 9 is located on a working surface. During the drilling process, the down-the-hole drill bit can crush the foundation pile into slag, and after the high-pressure water body is sprayed out from the water outlet along the straight water channel 8 and the inclined water channel 9, the slag is washed outwards to an orifice on the earth surface and discharged, so that the down-the-hole drill bit is ensured not to be in direct contact with the surface of the foundation pile, and the crushing efficiency is higher.
In practical application, the working surface of the drill bit part 1 is further provided with an inclined-hole water channel 10, and the inclined-hole water channel 10 is communicated between the corresponding powder discharge groove 7 and the water outlet. The inclined hole water channel 10 is designed to open the water outlet and the powder discharge groove 7, so that slag materials after foundation pile crushing can be quickly separated from the rotating range of the down-the-hole drill bit along the inclined hole water channel 10 and the powder discharge groove 7, and the crushing efficiency is higher.
The above examples are merely illustrative of the present invention clearly and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. Nor is it intended to be exhaustive of all embodiments. And obvious changes and modifications may be made without departing from the scope of the present invention.
Claims (7)
1. A kind of hard alloy down-the-hole bit, characterized by that: including drill bit portion, drillstock portion, carbide tooth and stop pin, the tail end of drill bit portion is equipped with the screw thread counter bore, be equipped with on the working face of drill bit portion front end with the mounting hole of screw thread counter bore intercommunication, the mounting hole is the big taper hole of the little tail end of front end, the carbide tooth matches and installs in the mounting hole, drill bit portion with screw thread counter bore screw thread fastening connection sticiss the carbide tooth, be equipped with the perforation on the screw thread counter bore lateral wall, the stop pin is followed drill bit portion packs into, wears on drill bit portion and the drillstock portion.
2. The cemented carbide down-the-hole drill bit of claim 1, wherein: and a diamond-impregnated layer is arranged on the working surface of the front end of the drill bit part.
3. The cemented carbide down-the-hole drill bit of claim 2, wherein: the thickness of the impregnated diamond layer is controlled to be 0.5-5 mm.
4. The cemented carbide down-the-hole drill bit of claim 2, wherein: the matrix impregnated with the diamond layer is made of Ni-W alloy.
5. The cemented carbide down-the-hole drill bit of claim 1, wherein: and a plug is arranged in the threaded hole for mounting the locking pin on the drill bit part.
6. The cemented carbide down-the-hole drill bit of any one of claims 1 to 5, wherein: a plurality of powder discharge grooves are formed in the outer edge of the drill bit part at intervals.
7. The cemented carbide down-the-hole drill bit of claim 6, wherein: the powder discharging drill is characterized in that a straight-through water channel is arranged in the drill handle part, a plurality of inclined water channels are arranged in the drill head part, the straight-through water channel is communicated with the inclined water channels, a water outlet of the inclined water channels is located on the working face, inclined hole water channels are arranged on the working face, and the inclined hole water channels are communicated between the powder discharging groove and the water outlet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022735980.3U CN213540268U (en) | 2020-11-23 | 2020-11-23 | Hard alloy down-the-hole drill bit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022735980.3U CN213540268U (en) | 2020-11-23 | 2020-11-23 | Hard alloy down-the-hole drill bit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213540268U true CN213540268U (en) | 2021-06-25 |
Family
ID=76483941
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022735980.3U Expired - Fee Related CN213540268U (en) | 2020-11-23 | 2020-11-23 | Hard alloy down-the-hole drill bit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213540268U (en) |
-
2020
- 2020-11-23 CN CN202022735980.3U patent/CN213540268U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20210625 |