CN212003038U - Combined drill bit structure for drilling anchor rod/anchor cable - Google Patents
Combined drill bit structure for drilling anchor rod/anchor cable Download PDFInfo
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- CN212003038U CN212003038U CN202020647177.1U CN202020647177U CN212003038U CN 212003038 U CN212003038 U CN 212003038U CN 202020647177 U CN202020647177 U CN 202020647177U CN 212003038 U CN212003038 U CN 212003038U
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Abstract
The utility model discloses a combined drill bit structure for drilling anchor rods/anchor cables, which comprises a guide drill bit component and a reaming drill bit component, wherein the reaming drill bit component is connected below the guide drill bit component in a matching way, and the radial size of the guide drill bit component is smaller than that of the reaming drill bit component; the drilling machine is reliable in structure and good in use performance, effectively avoids the problems of shrinkage, hole collapse and poor hole forming quality of high-low stress weak surrounding rock, and is high in drilling efficiency and good in hole forming quality.
Description
Technical Field
The utility model relates to a tunnel drilling support construction technical field, concretely relates to combination drill bit structure for stock/anchor rope drilling.
Background
The pre-stressed long anchor rod/anchor cable supporting technology can be successfully applied to the extrusion type large-deformation tunnel on the premise that the drilled deep anchor hole can be stably drilled, so that higher requirements are provided for selection of drilling machines, particularly selection of a drill bit is a key factor for limiting the drilling efficiency and the drilling effect of the long anchor hole. The drilling holes in the extrusion large-deformation tunnel engineering are affected by the adverse factors such as weak and broken rock strata, high ground stress and the like, and the conditions such as shrinkage holes, hole collapse and the like are easy to occur, so that the hole forming efficiency of large-aperture drilling holes is low; meanwhile, for drilling deep holes, the conditions of low drilling efficiency, flat drilling, poor smoothness, unsmooth slag discharge, hole blockage and the like also exist.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a be used for a combination drill bit structure for stock/anchor rope drilling to solve the problem that current drill bit drilling efficiency is low, the pore-forming quality is poor.
The utility model provides an above-mentioned technical problem's technical scheme as follows: the combined drill bit structure for drilling the anchor rod/the anchor cable comprises a guide drill bit component and a reaming drill bit component which is connected below the guide drill bit component in a matching mode, wherein the radial dimension of the guide drill bit component is smaller than that of the reaming drill bit component;
the direction drill bit subassembly includes the drill body, set up in drill floor on the drill body and set up respectively on the drill floor and with a plurality of direction drill bits that drill floor, drill body set up the integral type structure, it is adjacent form the slag chute between the direction drill bit, follow the apopore has been seted up in the drill floor axis direction, the basin has been seted up to drill body both sides, reamer head subassembly cooperation is connected the drill body lower extreme.
Further, reamer bit subassembly includes that inside has the cylindricality rig floor, follows of mounting hole set up on the cylindricality rig floor circumferencial direction and with a plurality of drill bit installation bodies and the setting of formula structure as an organic whole are connected to the cylindricality rig floor and are in reamer bit on the drill bit installation body, and a plurality of the drill bit installation body sets up according to the same needle direction, and is adjacent form between the drill bit installation body and arrange the sediment groove, the cooperation of the drill body of direction drill bit subassembly is connected in the mounting hole of cylindricality rig floor.
Further, the medial surface of direction drill bit with all be provided with the cutting piece on the reamer bit medial surface, just the cutting piece surface is provided with the arc arch.
Furthermore, the number of the guide drill bits is two, and the two guide drill bits are symmetrical and arranged oppositely about the water outlet hole.
Further, the back inclination angle of the guide drill bit is 15-20 degrees, and the side rotation angle is 5-7.5 degrees.
Furthermore, the number of the reaming bits is three, the back inclination angle of each reaming bit is 20-25 degrees, and the side rotation angle is 7.5-15 degrees.
Further, the outer wall of the drill body is provided with an external thread, an internal thread matched with the external thread is formed in the mounting hole of the cylindrical drill floor, and the drill body is connected with the cylindrical drill floor through the matching of the external thread and the internal thread.
Further, a threaded sleeve communicated with the mounting hole is arranged at the bottom end of the cylindrical drill floor.
Further, the drill floor of the pilot bit assembly is of a pillar stand structure with an arc surface.
Furthermore, the water outlet groove is of a V-shaped structure and is radially arranged along the outer wall surface of the drill body.
The utility model discloses following beneficial effect has: the utility model provides a combination drill bit structure for stock/anchor rope drilling, its structure is reliable, and performance is good, has effectively avoided the weak country rock shrinkage cavity of high and low stress, hole collapse and the poor problem of pore-forming quality; by the combination form of the guide drill bit component and the expanding drill bit component, the drilling efficiency and the hole forming quality are effectively improved; small drill holes are quickly cut through the double-wing drill bit, stress and deformation of surrounding rock of the drill holes are released, a guiding effect is achieved for subsequent hole forming, the straightness of the drill holes is improved, and meanwhile the service life of the guiding drill bit is guaranteed; then, drilling out a designed aperture through a hole expanding drill bit, and grinding the rough part of the pore-forming wall through the structural characteristics of the hole expanding drill bit to ensure the smoothness of the pore wall; through the apopore, both realized washing the disintegrating slag of drill bit cutting, realized the cooling operation to the drill bit again, improved the performance of drill bit, increase of service life.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of a pilot bit assembly according to the present invention;
FIG. 3 is a top view of a pilot bit assembly according to the present invention;
fig. 4 is a schematic view of a medium reaming bit assembly of the present invention;
fig. 5 is a schematic view of a medium reaming bit assembly of the present invention;
the reference numerals shown in fig. 1 to 5 are respectively expressed as: 1-a pilot bit assembly, 2-a reamer bit assembly, 10-a drill body, 11-a drill stand, 12-a pilot bit, 13-a slag discharge groove, 14-a water outlet hole, 15-a water outlet groove, 201-a mounting hole, 20-a cylindrical drill stand, 21-a drill bit mounting body, 22-a reamer bit, 3-a cutting blade, 4-a threaded sleeve, 5-a drill rod and 6-a rock body.
Detailed Description
The principles and features of the present invention are described below in conjunction with the following drawings, the examples given are only intended to illustrate the present invention and are not intended to limit the scope of the present invention.
As shown in fig. 1, the combined drill bit structure for drilling a rock bolt/anchor cable comprises a pilot bit assembly 1 and a reamer bit assembly 2 which is fittingly connected below the pilot bit assembly 1, wherein the radial dimension of the pilot bit assembly 1 is smaller than that of the reamer bit assembly 2. The guide drill bit assembly 1 is connected with the top end of the reaming drill bit assembly 2 through threads to form a combined drill bit structure, and the bottom end of the reaming drill bit assembly 2 is connected with a drill rod of a drilling machine through threads. During drilling, the drill rod of the drilling machine drives the combined drill head to move, and the double-wing wire drill bit assembly quickly cuts a small drilled hole to release the stress and deformation of the surrounding rock to be drilled, so that the problems of shrinkage and hole collapse of the soft surrounding rock with high and low stress are avoided, and drilling guide is not provided for subsequent hole forming; the desired design hole diameter is then drilled through reamer head assembly 2, effectively increasing the drilling efficiency.
As shown in fig. 2 to 3, the pilot bit assembly 1 includes a drill body 10, a drill floor 11 disposed on the drill body 10, and a plurality of pilot bits 12 respectively disposed on the drill floor 11 and integrated with the drill floor 11 and the drill body 10, a slag discharge groove 13 is disposed between adjacent pilot bits 12, a water outlet hole 14 is formed along a central axis of the drill floor 11, water outlet grooves 15 are formed on two sides of the drill body 10, and the reaming bit assembly 2 is cooperatively connected to a lower end of the drill body 10. Two direction drill bits 12 are symmetrical and set up about apopore 14 in opposite directions, and the brill body 10 is connected with the cooperation of reaming drill bit subassembly 2, and the structure is reliable, and the rig floor 11 is the stylobate structure that has the cambered surface. In the drilling process, water is supplied to the drill bit through the water pipe in the drill rod and flows out from the water outlet hole 14, so that the slag cut by the drill bit is washed, the guide drill bit 12 is cooled, and the use performance is improved. The slag after flushing is removed through the slag discharge groove 13, the drill bit is prevented from being blocked, the slag discharge groove 13 is of a V-shaped structure, the water flow speed is increased, and the slag discharge efficiency is improved.
As shown in fig. 4 to 5, the reaming bit assembly 2 includes a cylindrical drill floor 20 having a mounting hole 201 inside, three bit mounting bodies 21 arranged along the circumferential direction of the cylindrical drill floor 20 and connected to the cylindrical drill floor 20 as an integral structure, and a reaming bit 22 arranged at the upper end of the bit mounting bodies 21, and three bit mounting bodies 21 are arranged in the same needle direction, adjacent to each other, a slag discharge groove 13 is formed between the bit mounting bodies 21, and the bit bodies 10 of the pilot bit assembly 1 are connected in the mounting hole 201 of the cylindrical drill floor 20 in a matching manner. And the needle directions include co-clockwise or co-counterclockwise. The top end of the cylindrical drill floor 20 is connected with the drill body 10 in a matching way, and the bottom end of the cylindrical drill floor 20 is connected with the drill rod in a matching way and is positioned on the same central axis. After the pilot bit 12 drills, the small hole drilled by the pilot bit 12 is reamed through the reaming bit 22, the drill bit rotates to cut rocks in the drilling process, water flowing out of the water outlet hole 14 flows to the slag discharge groove 13 between the drill bit mounting bodies 21, cut crushed slag is flushed out through the slag discharge groove 13, and the drill bit which generates high temperature in cutting is cooled through water flow.
In order to improve drilling efficiency, the utility model discloses in, all be provided with cutting piece 3 on the medial surface of pilot bit 12 and the reamer bit 22 medial surface, just 3 surfaces on the cutting piece are provided with the arc arch. The cutting blade 3 is in a cylindrical sheet shape, and preferably adopts a diamond compact, so that the hole forming smoothness in the drilling process is improved. The arc-shaped protrusion serves as an auxiliary drilling piece, the drill bit can drill holes, and meanwhile the auxiliary drilling effect is achieved, and the drilling speed and efficiency are improved.
In order to facilitate the rock breaking and slag discharging operation of the drill bit, in the utility model, the back inclination angle of the guide drill bit 12 is 15-20 degrees, and the side turning angle is 5-7.5 degrees.
In order to improve the smoothness of the drilled hole and the drilling efficiency, the utility model discloses in, the caster angle of reamer bit 22 is 20 ° -25 °, and the side corner is 7.5 ° -15 °.
In order to facilitate the replacement and the maintenance between the pilot bit 12 and the reamer bit 22, the utility model discloses in, the outer wall of the drill body 10 is provided with the external screw thread, has seted up the internal thread with external screw thread matched with in the mounting hole 201 of cylindricality rig floor 20, through the external screw thread with interior screw-thread fit will the drill body 10 is connected with cylindricality rig floor 20. The detachable connection between the guide drill bit 12 and the expanding drill bit 22 is realized through the threaded connection, the disassembly and the assembly between the drill bits are convenient, the reliability of the connection is improved through the self-locking performance of the threads,
in order to facilitate the connection of the drill bit and the drill rod, the utility model discloses in, cylindricality rig floor 20 bottom is provided with the threaded sleeve 4 that is linked together with mounting hole 201.
In order to avoid the phenomenon that the drill bit mud bag appears at drilling process to the pilot bit, the utility model discloses in, the apopore of pilot bit 12 is three.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (8)
1. The combined drill bit structure for drilling the anchor rod/the anchor cable is characterized by comprising a guide drill bit component (1) and a hole expanding drill bit component (2) connected below the guide drill bit component (1) in a matched mode, wherein the radial size of the guide drill bit component (1) is smaller than that of the hole expanding drill bit component (2);
guide bit subassembly (1) including boring body (10), set up in rig floor (11) on the body (10) and set up respectively drill floor (11) go up and with rig floor (11), bore a plurality of guide bit (12) that body (10) set up the integral type structure, adjacent form between guide bit (12) and arrange cinder notch (13), follow apopore (14) have been seted up in rig floor (11) axis direction, basin (15) have been seted up to bore body (10) both sides, reamer bit subassembly (2) cooperation is connected drill body (10) lower extreme.
2. The combined drill bit structure for anchor/anchor cable drilling according to claim 1, wherein the reamer head assembly (2) comprises a cylindrical drill floor (20) having a mounting hole (201) therein, a plurality of drill bit mounting bodies (21) arranged along a circumferential direction of the cylindrical drill floor (20) and connected with the cylindrical drill floor (20) as an integral structure, and a reamer bit (22) arranged at an upper end of the drill bit mounting bodies (21), wherein the plurality of drill bit mounting bodies (21) are arranged in the same needle direction, a slag discharge groove (13) is formed between the adjacent drill bit mounting bodies (21), and the drill bodies (10) of the pilot bit assembly (1) are fittingly connected in the mounting hole (201) of the cylindrical drill floor (20).
3. A composite drill bit structure for rock bolt/anchor cable drilling according to claim 2, characterized in that the inner side of the pilot drill bit (12) and the inner side of the expanding drill bit (22) are provided with cutting blades (3), and the surface of the cutting blade (3) is provided with an arc-shaped protrusion.
4. Combined drill bit structure for rock bolt/anchor line drilling according to any one of claims 1 to 3, characterized in that the pilot drill bits (12) are two and that the two pilot drill bits (12) are symmetrical and oppositely arranged with respect to the water outlet hole (14).
5. A combined drill bit structure for rock/anchor line drilling according to claim 1, characterised in that the pilot bit (12) has a back rake angle of 15 ° -20 ° -and a side rake angle of 5 ° -7.5 °.
6. A combined drill bit structure for rock bolt/cable bolt drilling according to claim 2, characterised in that the number of reamer bits (22) is three and that the back rake angle of the reamer bits (22) is 20 ° -25 ° and the side angle is 7.5 ° -15 °.
7. A composite drill bit structure for rock bolt/anchor cable drilling according to claim 3, characterized in that the outer wall of the drill body (10) is provided with an external thread, the mounting hole (201) of the cylindrical drill floor (20) is internally provided with an internal thread matching with the external thread, and the drill body (10) is connected with the cylindrical drill floor (20) through the matching of the external thread and the internal thread;
the bottom end of the cylindrical drill floor (20) is provided with a threaded sleeve (4) communicated with the mounting hole (201).
8. Combined drill head structure for rock bolt/anchor cable drilling according to claim 7, characterized in that the drill floor (11) of the pilot bit assembly (1) is a pillar stand structure with a cambered surface, and the water outlet channel (15) is a V-shaped structure and is radially opened along the outer wall surface of the drill body (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020647177.1U CN212003038U (en) | 2020-04-24 | 2020-04-24 | Combined drill bit structure for drilling anchor rod/anchor cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020647177.1U CN212003038U (en) | 2020-04-24 | 2020-04-24 | Combined drill bit structure for drilling anchor rod/anchor cable |
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| Publication Number | Publication Date |
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| CN212003038U true CN212003038U (en) | 2020-11-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202020647177.1U Active CN212003038U (en) | 2020-04-24 | 2020-04-24 | Combined drill bit structure for drilling anchor rod/anchor cable |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111395969A (en) * | 2020-04-24 | 2020-07-10 | 杭州图强工程材料有限公司 | Combined drill bit structure for drilling anchor rod/anchor cable and construction method thereof |
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2020
- 2020-04-24 CN CN202020647177.1U patent/CN212003038U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111395969A (en) * | 2020-04-24 | 2020-07-10 | 杭州图强工程材料有限公司 | Combined drill bit structure for drilling anchor rod/anchor cable and construction method thereof |
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