CN106639888A - Rotary drilling rig and drilling bucket assembly thereof - Google Patents
Rotary drilling rig and drilling bucket assembly thereof Download PDFInfo
- Publication number
- CN106639888A CN106639888A CN201610940513.XA CN201610940513A CN106639888A CN 106639888 A CN106639888 A CN 106639888A CN 201610940513 A CN201610940513 A CN 201610940513A CN 106639888 A CN106639888 A CN 106639888A
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- Prior art keywords
- drilling
- assembly
- bucket assembly
- drilling bucket
- pipe
- Prior art date
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- 238000005553 drilling Methods 0.000 title claims abstract description 161
- 238000005520 cutting process Methods 0.000 claims abstract description 18
- 230000008878 coupling Effects 0.000 claims description 14
- 238000010168 coupling process Methods 0.000 claims description 14
- 238000005859 coupling reaction Methods 0.000 claims description 14
- 230000000712 assembly Effects 0.000 claims description 4
- 238000000429 assembly Methods 0.000 claims description 4
- 230000002787 reinforcement Effects 0.000 claims description 4
- 239000004744 fabric Substances 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 238000010276 construction Methods 0.000 abstract description 19
- 230000000694 effects Effects 0.000 abstract description 13
- 238000000034 method Methods 0.000 abstract description 12
- 230000008569 process Effects 0.000 abstract description 11
- 239000011435 rock Substances 0.000 description 17
- 238000009826 distribution Methods 0.000 description 4
- 208000007038 Dens in Dente Diseases 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 241001074085 Scophthalmus aquosus Species 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000004323 axial length Effects 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000009738 saturating Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 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
- E21B10/00—Drill bits
- E21B10/26—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers
-
- 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
- E21B10/00—Drill bits
- E21B10/42—Rotary drag type drill bits with teeth, blades or like cutting elements, e.g. fork-type bits, fish tail bits
- E21B10/43—Rotary drag type drill bits with teeth, blades or like cutting elements, e.g. fork-type bits, fish tail bits characterised by the arrangement of teeth or other cutting elements
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 invention discloses a drilling bucket assembly. The drilling bucket assembly comprises a drilling tube capable of achieving fixed-axis rotation, the top of the drilling tube is provided with a connecting component fixed with a drilling pipe of a rotary drilling rig, and the edge of the bottom of the drilling tube is provided with a plurality of cutting components; the middle of the drilling tube is coaxially provided with a guide part in a linked mode, the bottom of the guide part stretches out of the bottom end of the drilling tube, and the bottom of the guide part is provided with a guide cutting component. According to the drilling bucket assembly, the hole deflection phenomenon generated in the operation process of the rotary drilling rig can be avoided, and the construction effect and the operation efficiency are guaranteed. The invention further discloses the rotary drilling rig applying the drilling bucket assembly.
Description
Technical field
The present invention relates to rotary drilling rig matching component technical field, more particularly to a kind of drilling bucket assembly.The invention further relates to
A kind of rotary drilling rig of the application drilling bucket assembly.
Background technology
Rotary drilling rig is the capital equipment of present pile foundation construction, and drilling bucket is directly determined as the actuating station of equipment
The service efficiency and construction quality of rig.Lithosphere is the operating mode for being most difficult to construct in work progress, it usually needs by rotary rock drill
Saturating rear coring (monoblock rock) is blended (metalling), and distribution of the rock in underground is also uneven, connects the drilling rod of drilling bucket
It is made up of more piece, suit also has larger gap between often saving so that drilling bucket exists rock in the course of the work, and geological conditions adds
The upper equipment factor of itself causes inclined hole phenomenon, and inclined hole is the key factor for affecting construction quality, can not only delay the duration also
A large amount of economic losses can be caused, is adversely affected to related production and construction operation.
Therefore, the inclined hole phenomenon in rotary drilling rig operation process how is avoided, it is ensured that construction effect and operating efficiency are these
Art personnel need at present the important technological problems for solving.
The content of the invention
It is an object of the invention to provide a kind of drilling bucket assembly, the drilling bucket assembly can be avoided in rotary drilling rig operation process
Inclined hole phenomenon, it is ensured that construction effect and operating efficiency.It is a further object of the present invention to provide a kind of using above-mentioned drilling bucket assembly
Rotary drilling rig.
To solve above-mentioned technical problem, the present invention provides a kind of drilling bucket assembly, including can fixed-axis rotation drilling pipe, the brill
The top of cylinder is provided with the coupling assembly mutually fixed with the drilling rod of rotary drilling rig, and the bottom edge of the drilling pipe is provided with some
Cutter assembly；
Guide is coaxially arranged with the middle part of the drilling pipe with being connected, the bottom of the guide stretches out in the drilling pipe
Bottom, and the bottom of the guide is provided with guiding cutter assembly.
Preferably, each cutter assembly is along the circumferential uniform of the drilling pipe.
Preferably, the cutter assembly includes cutting bit assembly and gear wheel component.
Preferably, the guiding cutter assembly includes being oriented to cutting bit assembly and guiding gear wheel component.
Preferably, the top of the drilling pipe has some passages.
Preferably, the peripheral part of the drilling pipe is provided with some chafing strips.
Preferably, the guide is hollow cylindrical structure.
Preferably, the middle part of the coupling assembly has the pilot hole for axially extending, edge on the side wall of the pilot hole
Pin-and-hole is extended radially through, the coupling assembly is mutually fixed by the lock pin through the pin-and-hole with drilling rod.
Preferably, some reinforcements are provided with the coupling assembly.
The present invention also provides a kind of rotary drilling rig, including body, and drilling rod, the bottom of the drilling rod are provided with the body
Drilling bucket assembly is connected with, the drilling bucket assembly is specially the drilling bucket assembly as described in above-mentioned any one.
Relatively above-mentioned background technology, drilling bucket assembly provided by the present invention, in its course of work, due to guide relative to
The reach structure of drilling pipe, therefore cutter assembly and the rock stratum of cutter assembly prior to drilling pipe bottom etc. that be oriented to of guide end make
Industry face contacts, and goes out a guiding aperture by guiding cutter assembly and guide part pair bench drill, is oriented to aperture and reaches after certain depth,
Drilling bucket is always integral to continue drilling as gyroaxis benchmark with the guiding aperture, and now each cutter assembly of drilling pipe bottom is used as master
Want homework department and be fully contacted to the rock stratum scope of operation and implement to bore the related operations such as digging.The scope of operation is received due to being oriented to when aperture creeps into
Geological condition affects less, and the drilling pressure for needing is less, thus working load is relatively low, is not susceptible to inclined hole phenomenon, so as to
Ensure that the large power drill digging operation process subsequently on the basis of the guiding aperture is not likely to produce inclined hole phenomenon, and then rotation has been effectively ensured
The overall operation precision and construction effect of rig are dug, and its operating efficiency is accordingly improved.
In another preferred version of the present invention, each cutter assembly is along the circumferential uniform of the drilling pipe.This is circumferential
Cloth structure ensure that each cutter assembly to the efficiency of construction of the rock stratum scope of operation and bore digging operation effectiveness, one-step optimization drilling pipe of going forward side by side
To cutter assembly and its stress distribution of related counterpart, the volume fatigue strength and construction quality of drilling bucket assembly are improved.
Description of the drawings
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
The stereochemical structure side top view of the drilling bucket assembly that Fig. 1 is provided by a kind of specific embodiment of the invention；
The stereochemical structure side upward view of the drilling bucket assembly that Fig. 2 is provided by a kind of specific embodiment of the invention；
Fig. 3 is the partial structurtes enlarged drawing of cutting bit assembly in Fig. 1 or Fig. 2；
Fig. 4 is the partial structurtes enlarged drawing of Fig. 1 or Fig. 2 dens in dente wheel assemblies.
Specific embodiment
The core of the present invention is to provide a kind of drilling bucket assembly, and the drilling bucket assembly can be avoided in rotary drilling rig operation process
Inclined hole phenomenon, it is ensured that construction effect and operating efficiency；Simultaneously, there is provided a kind of rotary drilling rig using above-mentioned drilling bucket assembly.
In order that those skilled in the art more fully understand the present invention program, with reference to the accompanying drawings and detailed description
The present invention is described in further detail.
Refer to the stereochemical structure of the drilling bucket assembly that Fig. 1 and Fig. 2, Fig. 1 are provided by a kind of specific embodiment of the invention
Side upward view；The stereochemical structure side top view of the drilling bucket assembly that Fig. 2 is provided by a kind of specific embodiment of the invention.
In a specific embodiment, drilling bucket assembly provided by the present invention, including can fixed-axis rotation drilling pipe 11, drilling pipe 11
Top be provided with the coupling assembly 12 mutually fixed with the drilling rod of rotary drilling rig, the bottom edge of drilling pipe 11 is provided with some cutting
Cut component 13；The middle part of drilling pipe 11 is coaxially arranged with guide 14 with being connected, and the bottom of guide 14 stretches out in drilling pipe 11
Bottom, and the bottom of guide 14 is provided with guiding cutter assembly 15.
In the course of work, because guide 14 is relative to the reach structure of drilling pipe 11, therefore the end of guide 14 is led
Contact prior to the scope of operation such as cutter assembly 13 and rock stratum of the bottom of drilling pipe 11 to cutter assembly 15, and by guiding cutter assembly 15 with
The cooperation of guide 14 gets out a guiding aperture, is oriented to aperture and reaches after certain depth, and drilling bucket is total integral with the guiding aperture
Continue for gyroaxis benchmark drilling, now each cutter assembly 13 of the bottom of drilling pipe 11 as key operation portion with rock stratum operation
Face is fully contacted and implements to bore the related operation such as digging.Affected less by scope of operation geological condition due to being oriented to when aperture creeps into, and
The drilling pressure of needs is less, thus working load is relatively low, is not susceptible to inclined hole phenomenon, so as to ensure subsequently with the guiding aperture
On the basis of large power drill dig operation process and be not likely to produce inclined hole phenomenon, and then the overall operation precision of rotary drilling rig has been effectively ensured
And construction effect, and its operating efficiency is accordingly improved.
It should be noted that in specific to practical application, the length of above-mentioned guide 14 is generally drilling pipe axial length
Relativeness between 1.5 times, but the length specification and drilling pipe size of the guide 14 is not limited thereto, in principle, as long as
Guide 14 is stretched out in the bottom of drilling pipe 11 and is ensured to bore and can implement stable guiding aperture rotary digging operation i.e. during digging
Can.
Further, each cutter assembly 13 is along the circumferential uniform of drilling pipe 11.The circumferential distribution equalizing structure ensure that each cutting
Component 13 is to the efficiency of construction of the rock stratum scope of operation and bores and digs operation effectiveness, one-step optimization drilling pipe 11 of going forward side by side and cutter assembly 13 and its
The stress distribution of related counterpart, improves the volume fatigue strength and construction quality of drilling bucket assembly.
Refer to Fig. 3 and the partial structurtes enlarged drawing that Fig. 4, Fig. 3 are cutting bit assembly in Fig. 1 or Fig. 2；Fig. 4 is Fig. 1 or Fig. 2
The partial structurtes enlarged drawing of dens in dente wheel assembly.
Cutter assembly 13 includes cutting bit assembly 131 and gear wheel component 132.Cutting bit assembly 131 is closed by the hard of end
Golden portion breaks the instrument of rock into pieces in the form of a contact, and it is obvious to structure in soft rock and strong knot and decayed rock treatment effect；
And gear wheel component 132 is by rotatable cutter (generally by constitute in its surface of revolution tungsten carbide button piece), by grinding
Mode rock is cut off, it is obvious to hard rock treatment effect.During actual job, can be according to actual working conditions and construction operation
Facestock matter is flexibly from any one in above-mentioned cutting bit assembly 131 or gear wheel component 132 or direct by above-mentioned cutting bit assembly 131
It is integrated in single cutter assembly 13 with gear wheel component 132, so that selection is adjusted flexibly during construction operation, in principle, only
If disclosure satisfy that the actually used needs of the drilling bucket assembly.
More specifically, be oriented to cutter assembly 15 to include being oriented to cutting bit assembly and guiding gear wheel component.It should be noted that tool
To in practical application, in addition to rigging position difference, above-mentioned guiding cutter assembly 15 is basic with the substantial structure of cutter assembly 15 for body
Identical, correspondingly, the concrete structure for being oriented to cutting bit assembly may be referred to the structure of cutting bit assembly 131 in Fig. 3, be oriented to gear wheel component
Concrete structure may be referred to the structure of Fig. 4 dens in dente wheel assemblies；Meanwhile, the guiding cutter assembly 15 can also be according to actual condition
Need flexibly from any one in above-mentioned guiding cutting bit assembly or guiding gear wheel component, or directly adopt above-mentioned guiding pick
Component and guiding gear wheel component are integrated in the version in single guiding cutter assembly 15, will not be described here, as long as energy
Enough meet the actually used needs of the drilling bucket assembly.
Additionally, the top of drilling pipe 11 has some passages 111.In operation process, the passage 111 can be prevented effectively
Negative pressure of vacuum phenomenon is produced after being filled up by material in drilling pipe 11, it is ensured that the company between the internal gas environment of drilling pipe 11 and external environment condition
It is logical, so that the materials such as the ground inside drilling pipe 11 can be discharged rapidly and efficiently.
Further, the peripheral part of drilling pipe 11 is provided with some chafing strips 112.The chafing strip can effectively prevent operation
The outer wall of drilling pipe 11 produces structural wear in journey, to ensure the structural strength and durability of drilling pipe 11, and makes the entirety of drilling bucket assembly
Service life and fatigue strength are accordingly improved.
On the other hand, guide 14 is hollow cylindrical structure.This kind of hollow cylindrical structure contributes to further raising
The rotary stability of guide 14 and its positioning precision of bore operation, so as to further avoid drilling bucket assembly operation process in send out
The inclined hole phenomenon of life, it is ensured that the homework precision of rotary drilling rig.
It should be pointed out that above-mentioned guide 14 is only preferred version for hollow cylindrical structure, specific to practical application in, should
Guide 14 can also be the shape such as solid conical or hollow polygon prism, in principle, as long as ensure that stable revolution
Bore operation effect simultaneously meets the actually used needs of the drilling bucket assembly.
Additionally, the middle part of coupling assembly 12 has the pilot hole 121 for axially extending, along footpath on the side wall of pilot hole 121
To through there is pin-and-hole 122, coupling assembly 12 is mutually fixed by the lock pin (not shown) through pin-and-hole 122 with drilling rod.Assembling
When, first the assembling end of drilling rod is plugged in pilot hole 121, lock pin is inserted in pin-and-hole 122 and through the assembling of drilling rod afterwards
End, by drilling rod and the drilling bucket assembly reliably spacing fixation, to ensure subsequent job during between drilling bucket assembly and drilling rod
Linkage effect and operating efficiency.
In addition, being provided with some reinforcements 123 in coupling assembly 11.The reinforcement 123 can significantly improve coupling assembly
The structural strength of 11 associated components, it is ensured that the overall structure stability in the drilling bucket assembly course of work, and make its internal stress point
Cloth is more uniform.
In a specific embodiment, rotary drilling rig provided by the present invention, including body, is provided with brill on the body
Bar, the bottom of the drilling rod is connected with drilling bucket assembly, and the drilling bucket assembly is specially the drilling bucket assembly such as each embodiment above.Institute
It is difficult to locate the inclined hole phenomenon of yell in the operation process for stating rotary drilling rig, and its construction effect is preferably, operating efficiency is higher.
In summary, the present invention in provide drilling bucket assembly, including can fixed-axis rotation drilling pipe, set at the top of the drilling pipe
The coupling assembly mutually fixed with the drilling rod of rotary drilling rig is equipped with, the bottom edge of the drilling pipe is provided with some cutter assemblies；
Guide is coaxially arranged with the middle part of the drilling pipe with being connected, the bottom of the guide stretches out in the bottom of the drilling pipe,
And the bottom of the guide is provided with guiding cutter assembly.In the course of work, because guide is relative to the reach of drilling pipe
Structure, therefore the scope of operations such as cutter assembly and rock stratum of the cutter assembly prior to drilling pipe bottom that are oriented to of guide end contact, and
One guiding aperture is gone out by guiding cutter assembly and guide part pair bench drill, aperture is oriented to and is reached after certain depth, drilling bucket assembly is whole
Body continues drilling as gyroaxis benchmark with the guiding aperture, and now each cutter assembly of drilling pipe bottom is used as key operation portion
It is fully contacted and implements to bore the related operations such as digging to the rock stratum scope of operation.Scope of operation geological condition shadow is received due to being oriented to when aperture creeps into
Sound is less, and the drilling pressure for needing is less, thus working load is relatively low, is not susceptible to inclined hole phenomenon, so as to ensure subsequently with
Large power drill on the basis of the guiding aperture digs operation process and is not likely to produce inclined hole phenomenon, and then the whole of rotary drilling rig has been effectively ensured
Body homework precision and construction effect, and its operating efficiency is accordingly improved.
Additionally, the rotary drilling rig using above-mentioned drilling bucket assembly provided by the present invention, is difficult to locate yell in its operation process
Preferably, operating efficiency is higher for hole phenomenon, and its construction effect partially.
Detailed Jie is carried out to drilling bucket assembly provided by the present invention and using the rotary drilling rig of the drilling bucket assembly above
Continue.Specific case used herein is set forth to the principle and embodiment of the present invention, and the explanation of above example is only
It is to be used to help understand the method for the present invention and its core concept.It should be pointed out that for those skilled in the art
For, under the premise without departing from the principles of the invention, some improvement and modification can also be carried out to the present invention, these improve and repair
Decorations are also fallen in the protection domain of the claims in the present invention.
Claims (10)
1. a kind of drilling bucket assembly, it is characterised in that：Including can fixed-axis rotation drilling pipe, be provided with the top of the drilling pipe and rotary digging
The coupling assembly that the drilling rod of rig is mutually fixed, the bottom edge of the drilling pipe is provided with some cutter assemblies；
Guide is coaxially arranged with the middle part of the drilling pipe with being connected, the bottom of the guide stretches out in the bottom of the drilling pipe
End, and the bottom of the guide is provided with guiding cutter assembly.
2. drilling bucket assembly as claimed in claim 1, it is characterised in that：Each cutter assembly is along the circumferential equal of the drilling pipe
Cloth.
3. drilling bucket assembly as claimed in claim 1, it is characterised in that：The cutter assembly includes cutting bit assembly and gear wheel group
Part.
4. drilling bucket assembly as claimed in claim 1, it is characterised in that：It is described guiding cutter assembly include be oriented to cutting bit assembly and
It is oriented to gear wheel component.
5. drilling bucket assembly as claimed in claim 1, it is characterised in that：The top of the drilling pipe has some passages.
6. drilling bucket assembly as claimed in claim 1, it is characterised in that：The peripheral part of the drilling pipe is provided with some chafing strips.
7. drilling bucket assembly as claimed in claim 1, it is characterised in that：The guide is hollow cylindrical structure.
8. drilling bucket assembly as claimed in claim 1, it is characterised in that：The middle part of the coupling assembly has what is axially extended
Pilot hole, has extended radially through pin-and-hole on the side wall of the pilot hole, the coupling assembly is by the lock pin through the pin-and-hole
Mutually fix with drilling rod.
9. drilling bucket assembly as claimed in claim 1, it is characterised in that：Some reinforcements are provided with the coupling assembly.
10. a kind of rotary drilling rig, including body, is provided with drilling rod on the body, it is total that the bottom of the drilling rod is connected with drilling bucket
Into, it is characterised in that：The drilling bucket assembly is specially drilling bucket assembly as claimed in any one of claims 1-9 wherein.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610940513.XA CN106639888A (en) | 2016-10-25 | 2016-10-25 | Rotary drilling rig and drilling bucket assembly thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610940513.XA CN106639888A (en) | 2016-10-25 | 2016-10-25 | Rotary drilling rig and drilling bucket assembly thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106639888A true CN106639888A (en) | 2017-05-10 |
Family
ID=58821378
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610940513.XA Pending CN106639888A (en) | 2016-10-25 | 2016-10-25 | Rotary drilling rig and drilling bucket assembly thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106639888A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109610494A (en) * | 2018-11-30 | 2019-04-12 | 福建建中建设科技股份有限公司 | A kind of embedding rock construction technology of large-diameter pile foundation |
| CN111520080A (en) * | 2020-04-13 | 2020-08-11 | 中建三局集团有限公司 | Protection device for preventing rotary drilling rig from jamming |
| CN113355996A (en) * | 2021-06-19 | 2021-09-07 | 江苏杜邦建设工程有限公司 | Highway road surface finishing device |
| CN114016922A (en) * | 2021-11-03 | 2022-02-08 | 中南大学 | Large-diameter grading rock breaking rotary drilling tool |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109610494A (en) * | 2018-11-30 | 2019-04-12 | 福建建中建设科技股份有限公司 | A kind of embedding rock construction technology of large-diameter pile foundation |
| CN109610494B (en) * | 2018-11-30 | 2021-07-16 | 福建建中建设科技有限责任公司 | Rock-socketed construction process for large-diameter pile foundation |
| CN111520080A (en) * | 2020-04-13 | 2020-08-11 | 中建三局集团有限公司 | Protection device for preventing rotary drilling rig from jamming |
| CN111520080B (en) * | 2020-04-13 | 2022-04-08 | 中建三局集团有限公司 | Protection device for preventing rotary drilling rig from jamming |
| CN113355996A (en) * | 2021-06-19 | 2021-09-07 | 江苏杜邦建设工程有限公司 | Highway road surface finishing device |
| CN113355996B (en) * | 2021-06-19 | 2022-03-11 | 江苏杜邦建设工程有限公司 | Highway road surface finishing device |
| CN114016922A (en) * | 2021-11-03 | 2022-02-08 | 中南大学 | Large-diameter grading rock breaking rotary drilling tool |
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Application publication date: 20170510 |
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