CN110424903A - Drill bit stablizes binary channels and receives slag-draining device - Google Patents
Drill bit stablizes binary channels and receives slag-draining device Download PDFInfo
- Publication number
- CN110424903A CN110424903A CN201910830467.1A CN201910830467A CN110424903A CN 110424903 A CN110424903 A CN 110424903A CN 201910830467 A CN201910830467 A CN 201910830467A CN 110424903 A CN110424903 A CN 110424903A
- Authority
- CN
- China
- Prior art keywords
- chamber
- outer tube
- pipe
- drill bit
- plate
- 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.)
- Granted
Links
- 238000005553 drilling Methods 0.000 claims abstract description 23
- 238000007789 sealing Methods 0.000 claims abstract description 15
- 238000003466 welding Methods 0.000 claims description 7
- 230000006641 stabilisation Effects 0.000 claims description 3
- 238000011105 stabilization Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 9
- 230000008014 freezing Effects 0.000 abstract description 3
- 238000007710 freezing Methods 0.000 abstract description 3
- 239000002893 slag Substances 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 238000009434 installation Methods 0.000 description 2
- 241001074085 Scophthalmus aquosus Species 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/10—Wear protectors; Centralising devices, e.g. stabilisers
- E21B17/1078—Stabilisers or centralisers for casing, tubing or drill pipes
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/18—Pipes provided with plural fluid passages
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/22—Rods or pipes with helical structure
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/12—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor using drilling pipes with plural fluid passages, e.g. closed circulation systems
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
The present invention provides drill bit and stablizes binary channels receipts slag-draining device, and the outer tube is set to the inside of the stable pipe；The outer tube and the stable pipe are supported by the chamber sieve plate and the chamber sealing plate；The chamber sieve plate, the outer tube, the chamber sealing plate and the stable pipe, which enclose to set to be formed, receives deslagging chamber；First entrance is opened up on the stable pipe, is connected to drilling with the inner cavity for stablizing pipe；Second entrance is opened up on the chamber sieve plate, is connected to the inner cavity of the stable pipe with the receipts deslagging chamber；Third entrance is opened up on the outer tube；It is connected to the receipts deslagging chamber with the second channel.By receiving the combination of deslagging chamber and channel structure, receives deslagging chamber and carry out receipts slag, be discharged by second channel, and feed liquor and drain separate, drilling will not be destroyed, so that it is guaranteed that bore size.And pass through the structure setting for stablizing pipe, it is ensured that drill bit is not hanging, realizes drill bit positioning drilling not sideslip, improves material expulsion efficiency, avoid bit freezing.
Description
Technical field
Stablize binary channels the invention belongs to borer drill rod technical field more particularly to drill bit and receives slag-draining device.
Background technique
There are problems in use in conventional drill.If Fig. 1 is conventional drill structural schematic diagram, drill bit 96 and brill
Bar 93 connects, and pierces in underground 97, and medium 91 enters from central through hole 92, material 94 boring under along 93 steel pipe surface of drilling rod and
Gap discharge between drilling 95.In the process, the flowing of medium 91 and material 94 can destroy drilling 95, and drilling 95 is caused to become
Greatly, drilling 95 deviates.In order to solve the above technical problems, applicant once researched and developed a binary channels drilling rod, application No. is:
201910037331.5, binary channels drilling rod is in using test process, although largely solving deflection of borehole
Problem.But since drill bit total amount is big, as drilling extends, the self weight of drill bit and drilling rod equally causes drill bit deviation, to make
The generation that the problems such as disconnected is broken at the reduction of discharge efficiency and bit freezing, connection screw thread, so that binary channels drilling rod remains unchanged, Distance Theory exists
Error.In order to further reduce this error, therefore researches and develops a drill bit and stablize binary channels receipts slag-draining device.
Summary of the invention
In order to solve the above-mentioned technical problem, stablize binary channels the invention discloses drill bit and receive slag-draining device.In order to disclosure
The some aspects of embodiment have a basic understanding, simple summary is shown below.The summarized section is not generally to comment
It states, nor to determine key/critical component or describe the protection scope of these embodiments.Its sole purpose is with simple
Form some concepts are presented, in this, as the preamble of following detailed description.
The present invention adopts the following technical scheme:
In some alternative embodiments, drill bit stablizes binary channels receipts slag-draining device, including, inner tube, outer tube and support spiral shell
Revolve band, said inner tube is arranged in the inside of the outer tube, form first passage inside said inner tube, the outer surface of said inner tube with
Second channel is formed between the inner surface of the outer tube；Several support helix bands being parallel to each other of setting in the second channel,
The one side of support helix band is welded on the outer surface of said inner tube, and another side is welded on the inner surface of the outer tube；Also wrap
It includes, stablizes pipe, chamber sieve plate, chamber sealing plate；The outer tube is set to the inside of the stable pipe；The outer tube and the stabilization
Pipe is supported by the chamber sieve plate and the chamber sealing plate；The chamber sieve plate, the outer tube, the chamber sealing plate and described
Stable pipe, which encloses to set to be formed, receives deslagging chamber.
First entrance is opened up on the stable pipe, is connected to drilling with the inner cavity for stablizing pipe；
Second entrance is opened up on the chamber sieve plate, is connected to the inner cavity of the stable pipe with the receipts deslagging chamber；
Third entrance is opened up on the outer tube；It is connected to the receipts deslagging chamber with the second channel；
It further, further include end-plate after end-plate and chamber before chamber；End-plate is set to described before the chamber
Stablize the front end of pipe, both ends are welded with stable pipe and the outer tube respectively；After end-plate is set to the stable pipe after described
End, both ends are welded with stable pipe and the outer tube respectively.
It further, further include preceding guide plate and rear deflector；The rear deflector is tapered sleeve structure, is oriented to after described
Sleeve-board welds on the outer tube with the outer tube and the stable pipe；The preceding guide plate is tiltedly mounted on the stable pipe
It is welded between the outer tube and with the outer tube and the stable pipe.
Further, the quantity of the support helix band is 1 to 4.
Further, extension tube is arranged in the front end of said inner tube, and the outer surface of the extension tube opens up external screw thread, described interior
The inner surface of the rear end of pipe opens up internal screw thread.
The utility model has the advantages that passing through the combination for receiving deslagging chamber and channel structure brought by of the invention, receive deslagging chamber and received
Slag is discharged by second channel, and feed liquor and drain separate, and will not destroy drilling, so that it is guaranteed that bore size.And pass through
Stablize the structure setting of pipe, it is ensured that drill bit is not hanging, realizes drill bit positioning drilling not sideslip, improves material expulsion efficiency, avoid
Bit freezing.
For the above and related purposes, certain illustrative aspects are described in detail in the following description and the annexed drawings, and
What it was indicated is only some modes in the utilizable various modes of principle of each embodiment.Other benefits and novelty
Property feature will be considered in conjunction with the accompanying with following detailed description and become obvious, the disclosed embodiments be to include it is all this
A little aspects and they be equal.
Detailed description of the invention
Fig. 1 is structural schematic diagram when existing drilling rod drills；
Fig. 2 is the front schematic view that drill bit stablizes that binary channels receives slag-draining device；
Fig. 3 is the right view of Fig. 2；
Fig. 4 is the C-C direction view of Fig. 3；
Fig. 5 is the schematic cross-section that drill bit stablizes that binary channels receives slag-draining device；
Fig. 6 is the D-D direction view of Fig. 2；
Fig. 7 is the E-E direction view of Fig. 2；
Fig. 8 is to stablize pipe structural schematic diagram；
Fig. 9 is the F-F direction view of Fig. 8；
Figure 10 is outer tube and inner tube structure schematic diagram；
Figure 11 is the G-G direction view of Figure 10；
Figure 12 is working principle diagram.
Specific embodiment
The following description and drawings fully show specific embodiments of the present invention, to enable those skilled in the art to
Practice them.Other embodiments may include structure, logic, it is electrical, process and other change.Embodiment
Only represent possible variation.Unless explicitly requested, otherwise individual components and functionality is optional, and the sequence operated can be with
Variation.The part of some embodiments and feature can be included in or replace part and the feature of other embodiments.
In some illustrative embodiments, as shown in figs. 2-11, it includes inner tube that drill bit, which stablizes binary channels to receive slag-draining device,
1, end-plate 5, stable pipe 6, chamber sieve plate 7, chamber sealing plate 8, chamber before outer tube 2, support helix band 3, preceding guide plate 4, chamber
End-plate 9 and rear deflector 10 afterwards.The inside of outer tube 2 is arranged in inner tube 1, forms first passage 107 inside inner tube 1, inner tube 1
Second channel 108 is formed between outer surface and the inner surface of outer tube 2.Several supports being parallel to each other of setting in second channel 108
Hurricane band 3, the one side of support helix band 3 are welded on the outer surface of inner tube 1, and another side is welded on the interior table of the outer tube 2
Face, to form binary channels drill bit, medium 101 enters out of first passage 107, is discharged by second channel 108.Stablize 6 sets of pipe
On outer tube 2, outer tube 2 is made to be located at the inside for stablizing pipe 6.Stablize pipe 6 and open up first entrance 105, chamber sieve plate 7 opens up second
Entrance 104 opens up third entrance 103 on outer tube 2.Stablize and is supported between pipe 6 and outer tube 2 by chamber sieve plate 7 and chamber sealing plate 8
Connection.More specifically, the chamber sieve plate 7 and the chamber sealing plate 8 are respectively along stablizing first entrance 105 that pipe 6 opens up
Axial two sides installation, is welded with the stable pipe 6 and the outer tube 2 respectively up and down.The chamber sieve plate 7 and first entrance
There are suitable distances to weld together at 105 edge.Chamber sieve plate 7, outer tube 2, chamber sealing plate 8 and firm pipe 6, which enclose, to be set to form receipts row
Slag chamber 106.So that drilling 110 is connected to the inner cavity 102 for stablizing pipe 6, the inner cavity 102 of the stable pipe and the receipts deslagging
Chamber 106 is connected to, and the receipts deslagging chamber 106 is connected to the second channel 108.
End-plate 5 is set to the front end of the stable pipe 6 before the chamber, both ends respectively with stablize pipe 6 and the outer tube 2
Welding is used to support firm pipe 6 and outer tube 2.And together with chamber sieve plate 7 and the chamber sealing plate 8 welding.The chamber rear end
9 sets of the sealing plate rear ends in the stable pipe 6, both ends respectively with stablize pipe 6 and the outer tube 2 and weld, be used to support firm pipe 6 with
Outer tube 2.And together with chamber sieve plate 7 and the chamber sealing plate 8 welding.The rear deflector 10 is tapered sleeve structure, is led after described
To 10 sets of plate on the outer tube 2, welded together with the outer tube 2 and the stable pipe 6；The inclination of preceding guide plate 4 installation
It is welded between the stable pipe 6 and the outer tube 2 and with the outer tube 2 and the stable pipe 6.
When work, drill bit 12 and drilling rod 11 are mounted on drill bit and stablize on binary channels receipts slag-draining device, and medium 101 is logical from first
Road 107 enters, and the material 111 under boring is entered from the first entrance 105 stablized on pipe 6 by the filtering of chamber sieve plate 7 with medium 101
Chamber 106 enters second channel 108 by third entrance 103 and is discharged, and alleviates the material 110 under boring and 101 pairs of medium drillings
110 destruction, it can be ensured that 110 construction size of drilling and accuracy.In the process, pass through 3 rotation forces of support helix band
Material and medium 101 are discharged along second channel 108, guarantee the continual discharge of material, improve expulsion efficiency, while making object
Material discharge is more laborsaving, reduces drilling machine power consumption.Stable 6 large area of pipe support is that drill bit 12 positions at the same time.
In an alternative embodiment, the quantity of support helix band 3 is 1 to 4.
In an alternative embodiment, extension tube is arranged in the front end of said inner tube 1, and the outer surface of the extension tube opens up
The inner surface of external screw thread, the rear end of said inner tube opens up internal screw thread, convenient for connecting with drill bit drill rod thread.
It should also be appreciated by one skilled in the art that various illustrative logical boxs, mould in conjunction with the embodiments herein description
Electronic hardware, computer software or combinations thereof may be implemented into block, circuit and algorithm steps.In order to clearly demonstrate hardware and
Interchangeability between software surrounds its function to various illustrative components, frame, module, circuit and step above and carries out
It is generally described.Hardware is implemented as this function and is also implemented as software, depends on specific application and to entire
The design constraint that system is applied.Those skilled in the art can be directed to each specific application, be realized in a manner of flexible
Described function, still, this realization decision should not be construed as a departure from the scope of protection of this disclosure.
Claims (5)
1. drill bit, which stablizes binary channels, receives slag-draining device, including, inner tube, outer tube and support helix band, said inner tube are arranged described
The inside of outer tube, said inner tube inside form first passage, shape between the outer surface of said inner tube and the inner surface of the outer tube
At second channel；Several support helix bands being parallel to each other of setting in the second channel, the one side welding of support helix band
In the outer surface of said inner tube, another side is welded on the inner surface of the outer tube；It is characterized by also including stablize pipe, chamber
Room sieve plate, chamber sealing plate；The outer tube is set to the inside of the stable pipe；The outer tube and the stable pipe pass through the chamber
Room sieve plate and chamber sealing plate support；The chamber sieve plate, the outer tube, the chamber sealing plate and the stable pipe enclose and set shape
At receipts deslagging chamber；First entrance is opened up on the stable pipe, is connected to drilling with the inner cavity for stablizing pipe；It is opened on the chamber sieve plate
If second entrance, it is connected to the inner cavity of the stable pipe with the receipts deslagging chamber；Third entrance is opened up on the outer tube；Make described
Deslagging chamber is received to be connected to the second channel.
2. drill bit as described in claim 1, which stablizes binary channels, receives slag-draining device, which is characterized in that further include end seal before chamber
End-plate after plate and chamber；End-plate is set to the front end of the stable pipe before the chamber, and both ends are managed respectively with stabilization and institute
State outer tube welding；End-plate is set to the rear end of the stable pipe after described, and both ends are welded with stable pipe and the outer tube respectively.
3. drill bit as claimed in claim 2, which stablizes binary channels, receives slag-draining device, which is characterized in that further include, preceding guide plate and
Rear deflector；The rear deflector is tapered sleeve structure, and the rear deflector covers on the outer tube, with the outer tube and described steady
Determine pipe welding；The preceding guide plate be tiltedly mounted between the stable pipe and the outer tube and with the outer tube and the stabilization
Pipe welding.
4. drill bit as claimed in claim 3, which stablizes binary channels, receives slag-draining device, which is characterized in that the number of the support helix band
Amount is 1 to 4.
5. drill bit as claimed in claim 4, which stablizes binary channels, receives slag-draining device, which is characterized in that the front end of said inner tube is arranged
Outer surface opens up externally threaded extension tube, and the inner surface of the rear end of inner tube opens up internal screw thread.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910830467.1A CN110424903B (en) | 2019-09-04 | 2019-09-04 | Drill bit stabilizing double-channel slag collecting and discharging device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910830467.1A CN110424903B (en) | 2019-09-04 | 2019-09-04 | Drill bit stabilizing double-channel slag collecting and discharging device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110424903A true CN110424903A (en) | 2019-11-08 |
| CN110424903B CN110424903B (en) | 2024-07-02 |
Family
ID=68417265
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910830467.1A Active CN110424903B (en) | 2019-09-04 | 2019-09-04 | Drill bit stabilizing double-channel slag collecting and discharging device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110424903B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112240166A (en) * | 2020-10-15 | 2021-01-19 | 西安乔木科技技术有限公司 | Water circulation treatment device for coal mine underground directional kilometer drilling machine and construction method thereof |
| CN113530481A (en) * | 2021-07-09 | 2021-10-22 | 河南理工大学 | Large-drift-diameter circumferential flow supply shield pressure relief sieve pore drill rod for outburst coal seam |
| CN113756730A (en) * | 2021-07-02 | 2021-12-07 | 河南理工大学 | Spiral drill rod for circumferential flow supply shield protection pressure relief sieve pore of outburst coal seam |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3916998A (en) * | 1974-11-05 | 1975-11-04 | Jr Samuel L Bass | Drilling stabilizer and method |
| CN202627983U (en) * | 2012-06-18 | 2012-12-26 | 濉溪县博文机械制造有限责任公司 | Drill rod for coal mine |
| CN207092979U (en) * | 2017-07-26 | 2018-03-13 | 中国水利水电第十四工程局有限公司 | A kind of prestress anchorage cable boring centralizer |
| CN108278081A (en) * | 2017-01-05 | 2018-07-13 | 通用电气公司 | The rotary steerable drilling system and method controlled based on out-of-balance force measurement |
| CN109594935A (en) * | 2019-01-15 | 2019-04-09 | 高九华 | Interior deslagging binary channels drilling rod |
| CN210530768U (en) * | 2019-09-04 | 2020-05-15 | 高九华 | Drill bit stable double-channel slag collecting and discharging device |
-
2019
- 2019-09-04 CN CN201910830467.1A patent/CN110424903B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3916998A (en) * | 1974-11-05 | 1975-11-04 | Jr Samuel L Bass | Drilling stabilizer and method |
| CN202627983U (en) * | 2012-06-18 | 2012-12-26 | 濉溪县博文机械制造有限责任公司 | Drill rod for coal mine |
| CN108278081A (en) * | 2017-01-05 | 2018-07-13 | 通用电气公司 | The rotary steerable drilling system and method controlled based on out-of-balance force measurement |
| CN207092979U (en) * | 2017-07-26 | 2018-03-13 | 中国水利水电第十四工程局有限公司 | A kind of prestress anchorage cable boring centralizer |
| CN109594935A (en) * | 2019-01-15 | 2019-04-09 | 高九华 | Interior deslagging binary channels drilling rod |
| CN210530768U (en) * | 2019-09-04 | 2020-05-15 | 高九华 | Drill bit stable double-channel slag collecting and discharging device |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112240166A (en) * | 2020-10-15 | 2021-01-19 | 西安乔木科技技术有限公司 | Water circulation treatment device for coal mine underground directional kilometer drilling machine and construction method thereof |
| CN113756730A (en) * | 2021-07-02 | 2021-12-07 | 河南理工大学 | Spiral drill rod for circumferential flow supply shield protection pressure relief sieve pore of outburst coal seam |
| CN113756730B (en) * | 2021-07-02 | 2023-10-27 | 河南理工大学 | Spiral drill rod with protruding coal seam circumference flow supply shield pressure relief sieve holes |
| CN113530481A (en) * | 2021-07-09 | 2021-10-22 | 河南理工大学 | Large-drift-diameter circumferential flow supply shield pressure relief sieve pore drill rod for outburst coal seam |
| CN113530481B (en) * | 2021-07-09 | 2024-01-09 | 河南理工大学 | Protruding coal seam large-diameter circumference flow supply shield pressure relief sieve mesh drill rod |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110424903B (en) | 2024-07-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110424903A (en) | Drill bit stablizes binary channels and receives slag-draining device | |
| US20190264544A1 (en) | Auxiliary feeding device for flexible pipe of radial horizontal well | |
| CN109594935A (en) | Interior deslagging binary channels drilling rod | |
| CN112112575B (en) | Garrulous soft coal seam airtight coring bit suitable for ground drilling | |
| CN105840118A (en) | Upward raise-boring machine chambering and stabilizing device and upward raise-boring machine | |
| CN210530768U (en) | Drill bit stable double-channel slag collecting and discharging device | |
| CN111827886A (en) | Double-pipe side-spraying PDC drill bit for clear water drilling argillization interlayer coring | |
| CN101382044A (en) | Barrel type alloy drill | |
| CN106837184A (en) | Broken screw thread deslagging base plate efficient drilling drill bit device in a kind of outer brill | |
| US6530440B1 (en) | Percussive drilling apparatus | |
| CN108425698B (en) | Coal mine down-hole tunnel tunnels method for treating flour dust | |
| CN216517978U (en) | Double-tube sampling device for underground coal mine | |
| CN207960501U (en) | Can fast drilling multistage drill bit | |
| CN106812461A (en) | Axially propulsion churn drilling tools and fluid power axially advance impact method to fluid power | |
| CN108612480A (en) | A kind of vortex pulse shock drill bit | |
| CN206668159U (en) | The geological prospecting single rotary double core barrel cored for negative pressure | |
| CN206374042U (en) | Adjustable openings device drill bit | |
| CN209483236U (en) | Interior deslagging binary channels drilling rod | |
| CN111140177B (en) | Reaming and casing running integrated complete drilling tool | |
| CN214247315U (en) | Deep hole airtight pressure maintaining sampler for coal mine | |
| CN212003038U (en) | Combined drill bit structure for drilling anchor rod/anchor cable | |
| CN211737050U (en) | Large-caliber drill bit for geological exploration | |
| CN110130842A (en) | Anti- pump drill bar and anti-pump drill | |
| CN220667472U (en) | Assembled drilling rod connecting device of shield tunnel hand-held type rock drill | |
| CN218934330U (en) | External thread button drill bit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant |