CN101566046A - Anti-collapse hole drill tool - Google Patents
Anti-collapse hole drill tool Download PDFInfo
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- CN101566046A CN101566046A CNA2009100747131A CN200910074713A CN101566046A CN 101566046 A CN101566046 A CN 101566046A CN A2009100747131 A CNA2009100747131 A CN A2009100747131A CN 200910074713 A CN200910074713 A CN 200910074713A CN 101566046 A CN101566046 A CN 101566046A
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Abstract
The invention discloses an anti-collapse hole drill tool, comprising a drill stem and a drill bit; wherein the external surface of the drill stem is provided with a helicoid which is provided with support chips at intervals; the outside of the helicoid is provided with a sleeve pipe which is connected with the drill tool and is in the opposite direction of the rotation of the drill stem; the drill bit is provided with a telescopic cutting lip and a primary bit whose external diameter is less than that of the telescopic cutting lip connected with the drill bit via a hinge pin and a spring; and the diameter of the telescopic cutting lip extended corresponds to the external diameter of the sleeve pipe. The drill bit is connected with the drill stem through a square hilt and a bayonet pin; the square hilt is provided with a spring lateral pin sprung by a blade spring and corresponds to the hole of the lateral pin on the wall of the drill stem; the insides of the drill bit, the square hilt and the drill stem are respectively provided with limber holes communicated with each other; and the limber hole in the drill bit corresponds to the cutting lip. The drill tool is suitable for geological structure, coal thickness, water prospecting and drainage, methane drainage, coal layer instilled with water and pressure released vent of varied geological coal layers, particularly suitable for drilling by adopting blasting method under complex conditions.
Description
Technical field
The present invention relates to a kind of instrument of in the coal seam, holing, the drilling tool that particularly a kind of hole that prevents to be got out subsides in boring procedure.
Background technology
In the Coal Production process, in order to prevent water or gas burst accident, before driving, need in the coal seam, beat release aperture, water in the coal seam or gas are discharged to eliminate coal seam stress, in the hole, place explosive then and carry out explosion.The equipment of deep holes such as the brill shot hole that uses in the colliery, spy water hole, spy gas hole all is to drive the drilling rod that can extend by rig at present, and the drilling rod front end is provided with a drill bit.All greater than the external diameter of drilling rod, in boring procedure, drilling rod does not generally contact with hole wall the external diameter of drill bit, after boring is finished drilling rod is withdrawn from together with drill bit.Because geological conditions is abominable on a lot of collieries, terrane stress is very big, the coal seam is really up to the mark sometimes or soft excessively, in boring procedure or after boring finished, the hole that often occurs being got out subsided, and causes drilling depth not enough, pore-forming and drilling efficiency have been influenced greatly, collapsing, water or the gas in the coal seam can not in time discharge behind the hole, also influences the placement degree of depth of explosive, has a strong impact on production efficiency.
Summary of the invention
The technical issues that need to address of the present invention provide the drilling tool that a kind of drilling efficiency and pore-forming probability hole high, that can prevent to be got out subsides.
For solving the problems of the technologies described above, the technical solution used in the present invention is:
A kind of anti-collapse hole drill tool comprises drilling rod, is arranged on the drill bit of drilling rod front end, and the external surface of drilling rod has conveyor screw.Spirochetal outside is provided with sleeve pipe; Drill bit is provided with the hypertonic drill lip that flexibly connects with bit body, and the diameter dimension when the hypertonic drill lip opens is corresponding with the external diameter of sleeve pipe, and the diameter dimension when promptly the hypertonic drill lip opens is slightly larger than the external diameter of sleeve pipe.Be provided with the limbers that interconnects in drill bit and the drilling rod.Sleeve pipe is the pipe that pvc material is made, and sleeve pipe is connected with rig, and its direction of rotation is opposite with drilling rod.
Further improvement of the present invention is: described hypertonic drill lip was connected with spring with being connected by bearing pin of bit body.Be provided with hole in correspondence with each other on the hypertonic drill lip on the other end of relative cutting edge and the bit body, the bearing pin that connects hypertonic drill lip and bit body is set in this hole, bearing pin is provided with the spring that struts the hypertonic drill lip.The link of hypertonic drill lip is connected in the bit body by bearing pin, and spring opens the hypertonic drill lip, and drill lip is close on bit body; After boring is finished or move back when boring, the hypertonic drill lip is subjected to the pressure of hole wall, casing wall and shrinks to the center, thereby drill bit and drilling rod are extracted out from sleeve pipe smoothly midway.
Further improvement of the present invention is: described bit body is provided with the cubic handle that is connected with drilling rod, and the drilling rod front end is provided with the cubic hole corresponding with the cubic handle of drill bit, and drilling rod is connected by cubic handle with drill bit, and cubic handle is inserted in the cubic hole; Bit body, cubic handle and drilling rod inside are provided with the limbers for drill bit water flowing or ventilation that interconnects, the drill lip of the corresponding drill bit of the outlet of the limbers on the bit body, and the junction of cubic handle and drilling rod is provided with sealing device.
Further improvement in the technical proposal is: described cubic handle is provided with the elasticity lateral pin, and the drilling rod wall is provided with the lateral pin hole clipping corresponding with the elasticity lateral pin.
Further improvement in the technical proposal is: the elasticity lateral pin on the described cubic handle is arranged between the endoporus and outer wall of cubic handle, in the hole of four directions handle, lateral pin below be provided with the spring of sheet shape, the spring of sheet shape is fixed on bore ends in the cubic handle by the snap ring of its end; Between elasticity lateral pin and cubic handle wall, be provided with the lateral pin ring, the lateral pin ring can be by being threaded on the cubic handle, also can be embedded on the cubic handle, the external dimensions of lateral pin ring is greater than the elasticity lateral pin, and its interior hole dimension and elasticity lateral pin corresponding matching are provided with sealing ring between lateral pin ring and the card elasticity lateral pin.Four directions handle upper sealing device has two places, and a place is provided with the large sealing packing ring of the end of cubic handle, and another place is arranged on the small sealing ring at elasticity lateral pin place.
Further improvement in the technical proposal is: be provided with bayonet lock groove in correspondence with each other on the seamed edge of described cubic handle and on the drilling rod, the bayonet lock that connects cubic handle and drilling rod is set in the two bayonet lock grooves.This retaining pin module and above-mentioned elasticity lateral pin assembly can be present on cubic handle and the drilling rod simultaneously, and wherein a kind of also can be set separately.
Further improvement of the present invention is: the front end of bit body also is provided with the one-level drill bit of external diameter less than hypertonic drill lip external diameter.Be drilled with 4 weep holes on the bit body, give hypertonic drill lip and the water flowing of one-level drill bit respectively, to reduce the temperature of cutter head.
Further improvement of the present invention is: the rear end of described drilling rod also is provided with the cubic handle that is connected with rig, also is provided with elasticity lateral pin and/or bayonet lock groove on this cubic handle.
The further improvement of technical scheme of the present invention is: be arranged at intervals with the support chip that the nylon material of the supporting sleeve that contacts with internal surface of sleeve pipe is made on the described conveyor screw.
Owing to adopted technique scheme, the obtained technological progress of the present invention is:
The present invention since in the outer setting of drilling rod sleeve pipe, in the hole that sleeve pipe stretches into the drill bit drilling rod under the drive of rig, sleeve pipe can adopt the anti-flame-proof polyvinyl chloride material of high strength, supports drill rods is rotated in the sleeve pipe high speed.Therefore in boring procedure or after boring finished, sleeve pipe was played a supporting role to hole wall, can prevent that the position of loosening from subsiding in the hole in, has increased the one-tenth porosity, has improved drilling efficiency.After reaching drilling depth, drilling rod is removed outward, and the hypertonic drill lip on the drill bit shrinks under the compressing of hole wall and casing wall, and drilling rod drives drill bit and withdraws from sleeve pipe, and sleeve pipe is stayed in the hole, can easily water in the coal seam or gas be discharged like this; In the hole, filling out when putting explosive the bottom that reaches the hole that also can be very well.The comparable original simple degree of depth by rod boring of drilling depth is dark 20～50 meters when this boring bar tool is adopted in test, and do not occur collapsing hole and bit freezing phenomenon, and collapsing the coal chance of success with blasting procedure increases greatly.
The hypertonic drill lip is connected with spring by bearing pin with bit body, can make the hypertonic drill lip remove when boring and can inwardly shrink, and be in open configuration non-removing when boring, and the pressure by work plane during boring is pressed on the bit body once more.Effect in the time of spring and bearing pin can make to be arranged on that the hypertonic drill lip is in symmetry status on the bit body, reduces moment of torsion, inclined to one side brill or tipping phenomenon that the increase that produces owing to drill lip is asymmetric is crept into.
Drill bit is connected by cubic handle with rig with drilling rod, drilling rod, and the location is convenient when not only connecting, and can increase the torsional strenght of coupling part.
The elasticity lateral pin cooperates with the lateral pin hole clipping of drilling rod wall on the handle of four directions, when grafting lateral pin can be depressed, the arrival pin-and-hole ejects during the place again, connects very conveniently, can also play interconnect function when moving back drilling rod.Bayonet lock groove on the handle of four directions cooperates installation with bayonet lock, play interconnect function when moving back drilling rod, has increased bonding strength, can effectively prevent to lose the phenomenon of drill bit.The water flowing wet boring can be adopted in the limbers that interconnects of hypertonic drill lip, cubic handle and drilling rod inside in harder coal seam, thereby softening coal body is raised the efficiency the application life of prolongation drill bit; When in softer coal seam, creeping into, can feed compressed air, strengthen chip removal, raise the efficiency, can effectively prevent collapse hole and bit freezing; Also can be simultaneously being mixed with water, the gas of arbitrary proportion feeds the drill bit place and creeps into, thereby reduces coal dust, lowers the temperature to blade.The sealing device that is provided with on the handle of four directions is for the water in the drill bit drilling rod, gas are sealed.
The elasticity lateral pin of four directions on the handle supports by the spring of sheet shape in the hole of cubic handle, the spring of sheet shape by with the hole of cubic handle in cooperates snap ring to fix, be easy for installation and removal, the sheet spring is along the direction of water flowing, difficult obstruction limbers does not influence water flowing, venting capability.When drilling rod was pegged graft, lateral pin can be depressed easily, eject.The installation of elasticity lateral pin is convenient in the setting of lateral pin ring.
One-level drill bit at the front end of bit body, when beginning to hole, can play positioning action, to prevent the trip-out difficulty or to train off the hole, the one-level drill bit gets out locating hole earlier, the hypertonic drill lip contacts and tensioning with the boring work plane subsequently, the one-level drill bit creeps into the hypertonic drill lip then, and the sleeve pipe of rig drive simultaneously enters in the hole together.
The conveyor screw that twines on the drilling rod can form coal guide groove, and the direction of rotation of sleeve pipe is opposite with the direction of rotation of drilling rod simultaneously, the derivation of coal dust when being convenient to creep into, the effect of the row's of playing coal dust.The support chip that the nylon material that is provided with at interval on conveyor screw is made has high-wearing feature and anti-anti-flammability, not only can supporting sleeve, and can reduce the frictional force of conveyor screw and sleeve pipe.The present invention is applicable to that spy geological structure, the coal in various geology coal seam is thick, visit and to discharge water, draw out methane, the coal body water filling, unload anti-pressure port etc., is specially adapted to adopt under complex conditions blasting procedure to creep into.
Description of drawings
Fig. 1 is a structure diagram of the present invention;
Fig. 2 is the schematic diagram of drill bit of the present invention;
Fig. 3 is the generalized section of Fig. 2;
Fig. 4 is the cross-sectional schematic diagram of Fig. 1.
Wherein: 01, drill bit, 02, sleeve pipe, 03, drilling rod, 04, bayonet lock;
101, one-level drill bit, 102, the hypertonic drill lip, 103, bit body, 104, cubic handle, 105, bearing pin, 106, lateral pin ring, 107, the elasticity lateral pin, 108, the sheet spring, 109, large sealing packing ring, 110, snap ring, 111, small sealing ring, 112, the bayonet lock groove, 113, spring, 114, the limbers;
30, drilling rod core, 31, conveyor screw, 32, support chip, 33, bolt, 34, cubic handle, 35, the bayonet lock groove, 36, the lateral pin hole clipping.
The specific embodiment
Below in conjunction with accompanying drawing the present invention is described in further details:
The overall structure of anti-collapse hole drill tool of the present invention as shown in Figure 1, comprise drilling rod 03, be arranged on the drill bit 01 of drilling rod 03 front end, drilling rod 03 mainly is made up of drilling rod core 30 and the conveyor screw 31 that is fixedly welded on its external surface, is provided with the limbers 114 that interconnects in drill bit 01 and the drilling rod 03.The outside of conveyor screw 31 is provided with sleeve pipe 02.The pipe that sleeve pipe 02 is made for pvc material, sleeve pipe is connected with rig, and its direction of rotation is opposite with drilling rod.Be arranged at intervals with the support chip 32 that the nylon material of the supporting sleeve 02 that contacts with internal surface of sleeve pipe is made on the conveyor screw 31, length of each group support chip is a spiralization cycle, and support chip 32 is fixedly connected on the conveyor screw 31 by bolt 33.
Described bit body 103 is provided with the cubic handle 104 that is connected with the drilling rod core 30 of drilling rod 03, the hole of drilling rod core 30 front ends is cubic hole, four directions handle 104 is inserted in the cubic hole, four directions handle 104 is provided with bayonet lock groove 112, also be provided with the bayonet lock groove on the cubic hole wall of drilling rod 03 front end, the cubic hole of four directions handle 104 and drilling rod 03 front end is plugged on together, and by bayonet lock 04 both is connected.Also be provided with elasticity lateral pin 107 on cubic handle 104, position corresponding with elasticity lateral pin 107 on the wall of drilling rod core 30 is provided with lateral pin hole clipping 36; Elasticity lateral pin 107 on the described cubic handle is arranged between the endoporus and outer wall of cubic handle, the four directions handle the hole in, elasticity lateral pin 107 below be provided with sheet spring 108, sheet spring 108 is fixed on bore ends in the cubic handle by the snap ring that its end is provided with, the position that elasticity lateral pin 107 is installed on the wall of cubic handle 104 also is provided with lateral pin ring 106, elasticity lateral pin 107 is through in the lateral pin ring 106, lateral pin ring 106 is provided with small sealing ring 111 by in the screwed hole that is threaded in cubic handle 104 between lateral pin ring 106 and elasticity lateral pin 107.End at cubic handle 104 also is provided with large sealing packing ring 109, is used for the sealing between cubic handle and the drill pipe bore, guarantees that the junction of drilling rod and drill bit is water-tight.The front end of bit body 103 also is provided with the one-level drill bit 101 of external diameter less than hypertonic drill lip external diameter.Be drilled with the weep hole that is communicated with limbers in the drill bit on the bit body, give hypertonic drill lip and the water flowing of one-level drill bit respectively, with the temperature that reduces drill bit and wash ickings.After boring is finished or move back when boring, hypertonic drill lip 102 is subjected to the pressure of hole wall, casing wall and shrinks to the center, thereby drill bit 01 and drilling rod 03 are extracted out from sleeve pipe 02 smoothly midway.
The rear end of drilling rod 03 also is provided with the cubic handle 34 that is connected with rig.The structure of this cubic handle and identical with the connected mode of the connected mode of rig and drill bit and drilling rod.Have lateral pin assembly and seal and bayonet lock groove 35 equally.
The one-level bit bore diameter phi 68 of one embodiment of the present of invention, two blades of hypertonic drill lip change in the scope of φ 75～φ 110, and two blades are normally open, hypertonic drill lip bore diameter φ 110, remove when boring, two blades are run into box face and are recycled in the sleeve pipe.
Claims (10)
1, a kind of anti-collapse hole drill tool comprises drilling rod, is arranged on the drill bit of drilling rod front end, and it is characterized in that: the external surface of drilling rod has conveyor screw, and spirochetal outside is provided with sleeve pipe; Drill bit is provided with the hypertonic drill lip that flexibly connects with bit body, and the diameter dimension when the hypertonic drill lip opens is corresponding with the external diameter of sleeve pipe.
2, anti-collapse hole drill tool according to claim 1, it is characterized in that on the described hypertonic drill lip being provided with on the other end of cutting edge relatively and the bit body hole in correspondence with each other, be provided with the bearing pin that connects hypertonic drill lip and bit body in this hole, bearing pin is provided with the spring that struts the hypertonic drill lip.
3, anti-collapse hole drill tool according to claim 1 is characterized in that described bit body is provided with cubic handle, and the drilling rod front end is provided with the cubic hole corresponding with cubic handle, and drilling rod is connected by cubic handle with drill bit; Bit body, cubic handle and drilling rod inside be provided with interconnect be the limbers of drill bit water flowing, the junction of cubic handle and drilling rod is provided with sealing device.
4, anti-collapse hole drill tool according to claim 3 is characterized in that: described cubic handle is provided with the elasticity lateral pin, and the drilling rod wall is provided with the lateral pin hole clipping corresponding with the elasticity lateral pin.
5, anti-collapse hole drill tool according to claim 4, it is characterized in that the elasticity lateral pin on the described cubic handle is arranged between the endoporus and outer wall of cubic handle, in the hole of four directions handle, the elasticity lateral pin below be provided with the spring of sheet shape, the spring of sheet shape is fixed on bore ends in the cubic handle by the snap ring of its end; Between elasticity lateral pin and cubic handle wall, be provided with lateral pin ring and sealing ring.
6, anti-collapse hole drill tool according to claim 3 is characterized in that: be provided with bayonet lock groove in correspondence with each other on the seamed edge of described cubic handle and on the drilling rod, the bayonet lock that connects cubic handle and drilling rod is set in the bayonet lock groove.
7, according to claim 1 or 3 described anti-collapse hole drill tools, it is characterized in that: the rear end of described drilling rod also is provided with the cubic handle that is connected with rig, also is provided with elasticity lateral pin and/or bayonet lock groove on this cubic handle.
8, anti-collapse hole drill tool according to claim 1 is characterized in that the front end of described bit body also is provided with the one-level drill bit of external diameter less than hypertonic drill lip external diameter.
9, anti-collapse hole drill tool according to claim 1 is characterized in that being arranged at intervals with on the described conveyor screw support chip that the nylon material of the supporting sleeve that contacts with internal surface of sleeve pipe is made.
10, anti-collapse hole drill tool according to claim 1 is characterized in that described sleeve pipe is connected with rig, and its direction of rotation is opposite with drilling rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009100747131A CN101566046A (en) | 2009-06-11 | 2009-06-11 | Anti-collapse hole drill tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009100747131A CN101566046A (en) | 2009-06-11 | 2009-06-11 | Anti-collapse hole drill tool |
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| Publication Number | Publication Date |
|---|---|
| CN101566046A true CN101566046A (en) | 2009-10-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2009100747131A Pending CN101566046A (en) | 2009-06-11 | 2009-06-11 | Anti-collapse hole drill tool |
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| CN (1) | CN101566046A (en) |
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102226389A (en) * | 2011-03-28 | 2011-10-26 | 河南理工大学 | Coal Mine Drilling Anti-collapse Hole Network and Anti-collapse Hole Method |
| CN103114810A (en) * | 2013-02-02 | 2013-05-22 | 中国矿业大学 | Coal seam drilling hole-collapse preventing lower sleeve device capable of drilling along with drill and drilling method |
| CN104314482A (en) * | 2014-10-23 | 2015-01-28 | 河南理工大学 | Closed type helical hole-protecting drill and using method thereof for drilling of soft coal bed |
| CN104453721A (en) * | 2014-12-17 | 2015-03-25 | 中煤科工集团重庆研究院有限公司 | Anti-hole-collapse reverse circulation sampling drill bit |
| CN105089521A (en) * | 2015-08-27 | 2015-11-25 | 淮北矿业（集团）勘探工程有限责任公司 | Large-drift-diameter auger stem |
| CN105113980A (en) * | 2015-09-01 | 2015-12-02 | 山东科技大学 | Reusable anti-hole collapse drilling apparatus and drilling method thereof |
| CN105545215A (en) * | 2016-01-11 | 2016-05-04 | 安徽理工大学 | Drill bit for broken stratum drilling |
| CN106401487A (en) * | 2016-11-01 | 2017-02-15 | 太原理工大学 | Automatic protection wall elastic net releasing device capable of preventing drilled hole collapse |
| CN107620572A (en) * | 2016-07-13 | 2018-01-23 | 煤科集团沈阳研究院有限公司 | A kind of major diameter two-stage combined type artificial diamond compact drill bit |
| CN107842384A (en) * | 2017-12-18 | 2018-03-27 | 中国矿业大学 | The synchronous anchor and brill anchor method of a kind of hollow screw anchor pole |
| CN108999572A (en) * | 2018-09-19 | 2018-12-14 | 邹城兖矿泰德工贸有限公司 | Reinforced drill |
| CN110953017A (en) * | 2020-01-14 | 2020-04-03 | 中国矿业大学(北京) | Device and method for preventing gas extraction borehole from collapsing |
| CN111794682A (en) * | 2020-08-03 | 2020-10-20 | 河南理工大学 | A passive extruding pulsed coal chip jet pressure relief and permeability enhancement device for breaking coal and using method |
| CN113530452A (en) * | 2021-08-25 | 2021-10-22 | 广州海洋地质调查局 | A retractable drill bit and drilling tool equipment for offshore drilling |
| CN113790650A (en) * | 2017-07-19 | 2021-12-14 | Tbs矿业方案有限责任公司 | Method and apparatus for preventing rock fragments from entering or collapsing into blast holes |
| CN118223784A (en) * | 2024-04-29 | 2024-06-21 | 南京叶陆铭建筑工程有限公司 | Construction pre-drilling device with anti-deviation function |
-
2009
- 2009-06-11 CN CNA2009100747131A patent/CN101566046A/en active Pending
Cited By (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102226389A (en) * | 2011-03-28 | 2011-10-26 | 河南理工大学 | Coal Mine Drilling Anti-collapse Hole Network and Anti-collapse Hole Method |
| CN103114810A (en) * | 2013-02-02 | 2013-05-22 | 中国矿业大学 | Coal seam drilling hole-collapse preventing lower sleeve device capable of drilling along with drill and drilling method |
| CN104314482B (en) * | 2014-10-23 | 2017-04-12 | 河南理工大学 | Closed type helical hole-protecting drill and using method thereof for drilling of soft coal bed |
| CN104314482A (en) * | 2014-10-23 | 2015-01-28 | 河南理工大学 | Closed type helical hole-protecting drill and using method thereof for drilling of soft coal bed |
| CN104453721A (en) * | 2014-12-17 | 2015-03-25 | 中煤科工集团重庆研究院有限公司 | Anti-hole-collapse reverse circulation sampling drill bit |
| CN105089521A (en) * | 2015-08-27 | 2015-11-25 | 淮北矿业（集团）勘探工程有限责任公司 | Large-drift-diameter auger stem |
| CN105113980A (en) * | 2015-09-01 | 2015-12-02 | 山东科技大学 | Reusable anti-hole collapse drilling apparatus and drilling method thereof |
| CN105545215A (en) * | 2016-01-11 | 2016-05-04 | 安徽理工大学 | Drill bit for broken stratum drilling |
| CN107620572A (en) * | 2016-07-13 | 2018-01-23 | 煤科集团沈阳研究院有限公司 | A kind of major diameter two-stage combined type artificial diamond compact drill bit |
| CN106401487A (en) * | 2016-11-01 | 2017-02-15 | 太原理工大学 | Automatic protection wall elastic net releasing device capable of preventing drilled hole collapse |
| CN106401487B (en) * | 2016-11-01 | 2018-06-12 | 太原理工大学 | The retaining wall elastic network(s) automatic releasing device of prevention drilling collapse hole |
| CN113790650A (en) * | 2017-07-19 | 2021-12-14 | Tbs矿业方案有限责任公司 | Method and apparatus for preventing rock fragments from entering or collapsing into blast holes |
| CN113790650B (en) * | 2017-07-19 | 2024-02-06 | 阿奎里安科技有限责任公司 | Methods and devices to prevent rock fragments from entering or collapsing into blast holes |
| CN107842384A (en) * | 2017-12-18 | 2018-03-27 | 中国矿业大学 | The synchronous anchor and brill anchor method of a kind of hollow screw anchor pole |
| WO2019119901A1 (en) * | 2017-12-18 | 2019-06-27 | 中国矿业大学 | Synchronous anchor and drilling and anchoring method for hollow helical anchor bolt |
| CN108999572A (en) * | 2018-09-19 | 2018-12-14 | 邹城兖矿泰德工贸有限公司 | Reinforced drill |
| CN110953017A (en) * | 2020-01-14 | 2020-04-03 | 中国矿业大学(北京) | Device and method for preventing gas extraction borehole from collapsing |
| CN111794682A (en) * | 2020-08-03 | 2020-10-20 | 河南理工大学 | A passive extruding pulsed coal chip jet pressure relief and permeability enhancement device for breaking coal and using method |
| CN113530452A (en) * | 2021-08-25 | 2021-10-22 | 广州海洋地质调查局 | A retractable drill bit and drilling tool equipment for offshore drilling |
| CN113530452B (en) * | 2021-08-25 | 2023-10-27 | 广州海洋地质调查局 | A retractable drill bit and drilling equipment for ocean drilling |
| CN118223784A (en) * | 2024-04-29 | 2024-06-21 | 南京叶陆铭建筑工程有限公司 | Construction pre-drilling device with anti-deviation function |
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Open date: 20091028 |