CN106703703B - It can open and close type drill bit - Google Patents
It can open and close type drill bit Download PDFInfo
- Publication number
- CN106703703B CN106703703B CN201710077277.8A CN201710077277A CN106703703B CN 106703703 B CN106703703 B CN 106703703B CN 201710077277 A CN201710077277 A CN 201710077277A CN 106703703 B CN106703703 B CN 106703703B
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- groove
- bit body
- central movable
- movable fin
- open
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- 238000005520 cutting process Methods 0.000 claims abstract description 13
- 210000001364 upper extremity Anatomy 0.000 claims description 3
- 238000005553 drilling Methods 0.000 abstract description 21
- 238000010276 construction Methods 0.000 abstract description 5
- 241001074085 Scophthalmus aquosus Species 0.000 abstract description 4
- 239000011435 rock Substances 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 238000005299 abrasion Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000013011 mating Effects 0.000 description 2
- 230000000717 retained effect Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 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
- E21B10/42—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
A kind of open and close type drill bit, including hollow boring bit body and the central movable fin hinged with the hollow boring bit body, the hollow boring bit body set there are three or more wing, at least provided with a cutting tooth on the wing, the central movable fin is equipped at least one cutting tooth and is positioned at hollow boring bit body by spring holder, there is the groove of installation center mobile wing on the hollow boring bit body, one end of central movable fin is connected in hollow boring bit body groove by articulated structure, the other end is equipped with a positioning groove, the locating slot is stuck in it when central movable fin is closed for spring holder and is positioned, the groove is semi open model groove structure, the articulated structure is in the open one end of groove；The configuration of the present invention is simple as a result, handling convenience, when solving lower screen casing drilling construction in drilling rod, when brill chance rock is harder, bit body stress is larger easily deforms the technical issues of causing bit central fin not open normally.
Description
Technical field
The present invention relates to the technical field of drill bit more particularly to one kind can open and close type drill bit, for by drilling rod center not
Mention bore setting of casing or instrument and other items drilling process construction in, especially suitable for soft projecting coal bed mash gas pumping drilling construction into
Screen casing technique under row drilling rod center.
Background technique
The applicant's earlier application utility model patent " drill bit with removable inner core for drilling " (ZL:
200820028443.1) it solves the problems, such as not mentioning in and drilled through drilling rod central through hole down tube.The drill bit can realize drilling and forming hole
Afterwards, by drill pipe bore tripping in screen casing, to keep the channel of drilling gas extraction unimpeded, but the inner core for being related to drill bit is can to take off
Formula, inner core can be retained in hole after down tube, inner core cannot reuse, and cause waste of material.Earlier application it is practical new
It solves Centralizing fins in type patent " a kind of articulated type heart can open and close type drill bit " (ZL201220238740.5) and is retained in hole
Interior problem realizes the reusable of Centralizing fins, avoids waste of material.But the groove on its bit body is a kind of logical
Slot structure leads to the reduction of bit body integral strength, and reliability reduces, the larger easy hair of bit body stress when brill chance rock is harder
The shape that changes and clamping Centralizing fins, and then Centralizing fins when lower screen casing is caused not open normally, screen casing can not be successfully tripping in hole
Bottom constrains the realization that the drill bit passes through drill pipe bore tripping in screen casing function.
It is always the critical issue for perplexing and technique being hindered to promote that bit body, which is easily deformed problem, and during which we also repeatedly taste
Different bit body materials is replaced in examination, while bit body material carries out the heat treatment etc. of kinds of processes, as a result all undesirable, former
Because being that logical slot type structure destroys the overall performance of bit body so that bit body be unable to satisfy it is complicated during bottom hole detritus
Stress condition can partially improve the scheme of problem all along with high production cost, be unsatisfactory for the commercial introduction of product.
For this purpose, designer of the invention, in view of drawbacks described above, by concentrating on studies and designing, synthesis is engaged in for many years for a long time
The experience and achievement of related industry, researching and designing go out one kind can open and close type drill bit, to overcome drawbacks described above.
Summary of the invention
The purpose of the present invention is to provide one kind can open and close type drill bit, structure is simple, handling convenience, to solve drilling rod
When interior lower screen casing drilling construction, when brill chance rock is harder, larger easily deform of bit body stress leads to bit central fin
The technical issues of can not normally opening.
To solve the above problems, the invention discloses a kind of open and close type drill bit, including hollow boring bit body and hollow with this
The hinged central movable fin of bit body, the hollow boring bit body set there are three or more wing, at least set on the wing
There is a cutting tooth, it is characterised in that:
The central movable fin is equipped at least one cutting tooth and is positioned at hollow boring bit body, institute by spring holder
The groove for having installation center mobile wing on hollow boring bit body is stated, one end of central movable fin is connected to sky by articulated structure
In heart bit body groove, the other end is equipped with a positioning groove, and the locating slot is for spring holder when central movable fin is closed
It is stuck in it and is positioned, the groove is semi open model groove structure, and the articulated structure is in the open one end of groove, institute
Central movable fin is stated to realize around articulated structure rotation, to realize the opening and closing of central movable fin.
Wherein: the semi open model groove is U-shaped structure, and the plane of the U-shaped structure two sides is parallel to each other, described half
The open one end of open groove is through slot, and the closed other end of semi open model groove is blind slot and has fillet.
Wherein: one end of the central movable fin is equipped with the locating slot cooperated with spring holder, and the other end, which is equipped with, to be supplied
The perforative hinge hole of articulated structure, and the side upper limb of the central movable fin is equipped with for welding the socket of cutting tooth.
Wherein: the two sides of the U-shaped structure are correspondingly provided with hemispherical groove, the hinge hole of the central movable fin
Middle part is equipped with upper through-hole, and the articulated structure includes to be located at the ball pin of two sides and be located in the middle bolt, the two sides
The end of ball pin is that can protrude into realize hinged hemispherical projections in hemispherical groove, and rear portion is that can slide along hinge hole
Cylinder.
Wherein: the pin shaft can be inserted into the shrinkage pool of U-shaped structure, and run through the hinge hole of central movable fin.
Wherein: the spring holder includes spherical hoodle, cylindrical sleeve and spring, the outer rim of the cylindrical sleeve
Equipped with external screw thread, to engage with the internal screw thread of mounting hole, and the movement relative to mounting hole is realized, the spherical shape hoodle and spring position
In in cylindrical sleeve, the spherical shape hoodle is located at cylindrical sleeve and closes up one end, and the spring is located at spherical shape hoodle and cylinder
Between shape sleeve the other end face.
Wherein: central movable fin bottom both ends have fillet or oblique angle.
Through the above, the present invention maintains the globality of bit body while meeting product special designing and needing,
The overall structure of bit body is not destroyed, and during bottom hole detritus under complicated stress condition, which maintains higher
Intensity, fundamentally solve the technical issues of bit body is easily deformed, ensured the normal opening and closing of Centralizing fins.
Groove is semi open model structure, and the closed one end two sides bit body of groove is not divided, special meeting product
Design maintains the globality of bit body while needs, the overall structure of bit body is not destroyed, in bottom hole detritus process
Under the stress condition of middle complexity, which maintains higher intensity, fundamentally solves the technology that bit body is easily deformed
Problem has ensured the normal opening and closing of Centralizing fins.
Articulated structure may be bulb hinged, and hinge recess is spherical shape in groove, and hinge recess depth capacity is equal to ball
Shape radius, corresponding swivel pin and hinge recess mating surface are also spherical surface, and hinge recess spherical diameter is more than or equal to swivel pin bulb
Position diameter.Conventional pin shaft articulated manner, hinging pin shaft and axis hole are linear contact, in Centralizing fins by perpendicular to axial direction
Active force when, due to structure limit, pin shaft is partially thin, is easy to occur bending and deformation under responsive to axial force, and then cause to bore
Head opening mechanism failure, early period, a large amount of work had also been made in we thus, and pin shaft material has been carried out preferably and combined different
Treatment process has carried out shake-down analysis one by one, but under the stress condition of bottom hole detritus complexity, and the stress of pin shaft is difficult to control, examination
With ineffective, can partially improve in the scheme of trial effect, the material and process processing cost of pin shaft are high, are unsatisfactory for
The commercial introduction of product.Bulb hinged mode of the present invention, solves the problems, such as this, due to bulb hinged structure swivel pin
It is contacted with the open one end groove of groove and it is excessive to avoid single direction stress so that fin stress is more dispersed for sphere-contact
Caused deformation, sphere-contact make linkwork more flexible, while reducing the contact area of swivel pin and bit body, subtract
Small stress surface solves the case where causing Centralizing fins that can not open due to pin shaft deformation, improves the reliability of drill bit.
Positioning device is realized jointly by spring holder, central movable fin and hollow boring bit body.Spring positioning pearl peace
Close the positioning hole of one end mounted in hollow boring bit body groove, central movable fin in the closure state, spring holder bullet
The positioning pit of central movable fin one end is just protruded into pearl position or locating slot realizes positioning.Position is located at hollow boring bit body groove
Interior spring positioning pearl avoids and contacts rock powder in hole wall or hole in contact hole wall or unloading drilling rod turning course when fin is opened,
Hollow boring bit body forms a kind of protection to spring positioning pearl, so that positioning bead reduces abrasion caused by external force factor, positioning
Pearl longer life expectancy is more durable.
The present invention has carried out field test in Huainan Mining Area, adds up test 3, drill bit, and drill bit average life span is bored up to 590 meters
The head service life improves 40-50%, and drilling timeliness improves 30% or more, and test products do not occur deformation in use,
Drill bit opening mechanism is still reliable and stable when Cutter failure, and the present invention successfully solves what drill bit deformation was not opened
Problem sufficiently demonstrates correctness and advance of the invention.
Detailed content of the invention can be obtained by aftermentioned explanation and institute's attached drawing.
Detailed description of the invention
Fig. 1 show it is of the invention can open and close type drill bit structural schematic diagram.
Fig. 2 shows the top view of hollow bit body in the present invention；
Fig. 3 shows the cross-sectional view of Fig. 2；
Fig. 4 shows bulb hinged structural schematic diagram of the invention；
Fig. 5 shows axis hole articulated structure schematic diagram of the invention；
Fig. 6 shows the schematic diagram of central movable fin of the present invention；
Fig. 7 shows the schematic diagram of spring holder of the present invention.
Specific embodiment
Referring to Fig. 1, it is shown that the present invention can open and close type drill bit one embodiment.
The open and close type drill bit includes hollow boring bit body 1 and the central movable wing hinged with the hollow boring bit body 1
Piece 2, the hollow boring bit body 1 set there are three or more wing, at least provided with a cutting tooth 5 on the wing, it is described in
Heart mobile wing 2 is equipped at least one cutting tooth 5 and is positioned at hollow boring bit body by spring holder 3.
Wherein, the groove 4 of installation center mobile wing 2 is machined on the hollow boring bit body 1, central movable fin 2
One end is connected in hollow boring bit body groove 4 by articulated structure, and the other end is equipped with a positioning groove 17, and the locating slot is for spring
Positioning pin 3 is stuck in it when central movable fin 2 is closed and is positioned.Preferably, the groove 4 is semi open model groove
Structure, the articulated structure are in the open one end 23 of groove 4, and spring holder 3 is in the closed other end 22 of groove 4,
The central movable fin 2 can be realized to be rotated around articulated structure, to realize the opening and closing of central movable fin 2.
Pin shaft articulated structure or bulb hinged structure can be used in the articulated structure.Drill bit is in use, drilling construction is complete not
Do not extract rod bit out of drilling, from the inner hole of drilling orifice drilling rod into drilling tripping in screen casing, when screen casing reaches in drill bit
When at heart mobile wing 2, continue tripping in and disclose out central movable fin 2, be at open configuration, realizes that screen casing can smoothly enter into hole
At this moment bottom proposes rod bit, screen casing is stayed in hole.
As shown in Figure 2, of the invention can be in open and close type drill bit, the semi open model groove 4 is U-shaped structure, the U-shaped
The plane 24,25 of structure two sides is parallel to each other, and the open one end 23 of the semi open model groove 4 is through slot, described semi-open
The closed other end 22 of formula groove 4 is blind slot and has fillet 26, in order to process.
As shown in Figure 3, the present invention can be in open and close type drill bit, and the articulated structure is located at attached drawing mark in hollow boring bit body 1
The position of note 10, the spring holder 3 are installed on the position of the mounting hole 11 of hollow boring bit body 1.
Fig. 6 shows the structural schematic diagram of central movable fin 2 of the invention, and one end of the central movable fin 2 is set
Have the locating slot 17 cooperated with spring holder 3, the other end is equipped with for the perforative hinge hole 15 of articulated structure, and it is described in be indecisive and changeable
The side upper limb of dynamic fin 2 is equipped with for welding the socket 9 of cutting tooth 5, in order to provide avoiding interference with for opening and closing movement, it is described in
The both ends lower edge of heart mobile wing 2 is equipped with fillet 27,28, does opening and closing fortune to rotate in central movable fin 2 around articulated structure
It is more flexible between hollow boring bit body 1 when dynamic, it will not interfere.
Fig. 4 and Fig. 5 shows that the present invention preferred two kinds of articulated structures, described Fig. 4 can be shown in open and close type drill bit respectively
Bulb hinged, the two sides of the U-shaped structure are correspondingly provided with hemispherical groove 10, the hinge hole of the central movable fin 2
15 middle part is equipped with upper through-hole 14, and the articulated structure includes to be located at the ball pin 12 of two sides and be located in the middle bolt 13,
The end of the ball pin 12 of the two sides is that can protrude into realize hinged hemispherical projections in hemispherical groove 10, and rear portion is can
The cylinder slided along hinge hole 15, the bolt 13 can be inserted among two ball pins 12, and it is recessed that ball pin 12 is headed into hemispherical
Slot, and once extract bolt 13, then it can cancel ball pin 12, easily to remove central movable fin 2.
Described Fig. 5 shows that pin shaft is hinged, and the pin shaft 12 can be inserted into the shrinkage pool 16 of U-shaped structure, and is indecisive and changeable in running through
The hinge hole 15 of dynamic fin 2 makes central movable fin 2 equally to realize that central movable fin 2 is articulated on hollow boring bit body 1
It can be rotated around articulated structure, realize opening and closing for central movable fin 2.
Fig. 7 show the present invention can open and close type drill bit for realizing central movable fin 2 closure when with hollow boring bit body 1 it
Between positioning spring holder 3 structure, the spring holder 3 mainly includes spherical hoodle 19,20 and of cylindrical sleeve
The outer rim of spring 21, the cylindrical sleeve 20 can be equipped with external screw thread, to engage with the internal screw thread of the mounting hole 11, and realize
Relative to the movement of mounting hole 11, the spherical shape hoodle 19 is located in cylindrical sleeve 20 with spring 21, the spherical shape hoodle 19
In 20 closing in one end of cylindrical sleeve, the spring 21 is located between spherical hoodle 19 and 20 the other end face of cylindrical sleeve,
When work, spring 21 pushes down spherical hoodle 19, since spherical hoodle 19 is located at one end of the closing in of cylindrical sleeve 20, spherical hoodle
19 without departing from cylindrical sleeve 20, but exposes a part of spherical hoodle 19, when central movable fin 2 is closed, ball
A part that shape hoodle 19 exposes can protrude under the action of the spring 21 realizes positioning in the locating slot 17 of central movable fin 2,
It gives central movable fin 2 certain pretightning force, it is made in normal drilling to be that will not open.
Optionally, the shrinkage pool 16 is the hole with cylindrical surface, the mating surface of corresponding hinged pin shaft 12 and shrinkage pool 16
It also is cylindrical surface, this set effectively increases hinged intensity and abrasion resistant effect.
Those of skill in the art would appreciate that spring holder 3 can be connected through a screw thread, tight fit connection or bonding connection
Mode is installed on hollow boring bit body 1, there is locating slot 17 corresponding with spring holder 3 on central movable fin 2.
It can be seen that the invention discloses one kind by drilling rod center tripping in screen casing or other instruments equipment or to pass through brill
Fire-extinguishing function concurrently is opened and closed drill bit in the realization hole of bar center.Drill bit include with cutting tooth 5 hollow boring bit body 1 and with the sky
The spring holder of the hinged central movable fin 2 with cutting tooth 5 of heart bit body 1, centre of location mobile wing 2
3.The groove 4 of installation center mobile wing 2 is machined on hollow boring bit body 1,2 one end of central movable fin is connected by articulated manner
It connects in hollow boring bit body groove 4, the other end is positioned by spring holder 3.Central movable fin 2 passes through swivel pin 12
Realize the opening and closing on hollow boring bit body 1.1 upper groove 4 of hollow boring bit body is semi open model groove structure, and articulated structure is in recessed
The open one end 23 of slot 4, positioning device are in the closed one end 22 of groove 4.Core drill is made using the drill bit of this spline structure
The integral strength of head body 1 is more preferable, compares open groove structure, and hollow boring bit body 1 is not easy to deform and the stuck central movable wing
Piece 2 improves the reliability that can be opened and closed drill bit to improve the success rate of bit central mobile wing opening.It is open recessed
The generally U-shaped structure of slot 4,4 liang of side planes of groove are parallel to each other, and it is fillet that groove 4, which closes one end 22, easy to process.In be indecisive and changeable
Dynamic 2 bottom both ends of fin have fillet or oblique angle, interference when can be reduced closing motion with hollow boring bit body 1.
It is readily apparent that above description and record is only illustrated in the disclosure being not intended to be limiting of the invention
Appearance, application or use.Although describing and being described in the accompanying drawings embodiment in embodiment, the present invention is not limited
Be described as by attached drawing example and in embodiment it is now recognized that optimal mode to implement the particular case of the teachings of the present invention
Son, the scope of the present invention will include any embodiment for falling into the description and appended claims of front.
Claims (3)
1. a kind of open and close type drill bit, described including hollow boring bit body and the central movable fin hinged with the hollow boring bit body
Hollow boring bit body set there are three or more wing, at least provided with a cutting tooth on the wing, it is characterised in that:
The central movable fin is equipped at least one cutting tooth and is positioned at hollow boring bit body, the sky by spring holder
One end end face of heart bit body is equipped with the groove of installation center mobile wing, and one end of central movable fin passes through articulated structure
It is connected in the groove of hollow boring bit body, the other end is equipped with a positioning groove, and the locating slot is for spring holder in central movable
Fin is stuck in it when being closed and is positioned, and the groove is semi open model groove structure, and the articulated structure is opened in groove
The one end put, the central movable fin is realized to be rotated around articulated structure, to realize the opening and closing of central movable fin；
The semi open model groove is U-shaped structure, and the plane of the U-shaped structure two sides is parallel to each other, and the semi open model is recessed
One end of slot is open through slot, and the closed other end of semi open model groove is blind slot and has fillet, the U-shaped structure
Two sides be correspondingly provided with hemispherical groove, the middle part of the hinge hole of the central movable fin is equipped with upper through-hole, described hinged
Structure includes to be located at the ball pin of two sides and be located in the middle bolt, and the end of the ball pin of the two sides is that can protrude into hemisphere
To realize hinged hemispherical projections in connected in star, rear portion is the cylinder that can be slided along hinge hole；The spring holder includes
The outer rim of spherical hoodle, cylindrical sleeve and spring, the cylindrical sleeve is equipped with external screw thread, is nibbled with the internal screw thread with mounting hole
It closes, and realizes the movement relative to mounting hole；Central movable fin bottom both ends have fillet or oblique angle.
2. open and close type drill bit as described in claim 1, it is characterised in that: one end of the central movable fin is equipped with and spring
The locating slot of detent fit, the other end are equipped with for the perforative hinge hole of articulated structure, and the side of the central movable fin
Upper limb is equipped with to weld the socket of cutting tooth.
3. open and close type drill bit as described in claim 1, it is characterised in that: the spherical shape hoodle and spring are located at cylindrical sleeve
Interior, the spherical shape hoodle is located at cylindrical sleeve and closes up one end, and the spring is located at spherical hoodle and the cylindrical sleeve other end
Between end face.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710077277.8A CN106703703B (en) | 2017-02-14 | 2017-02-14 | It can open and close type drill bit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710077277.8A CN106703703B (en) | 2017-02-14 | 2017-02-14 | It can open and close type drill bit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106703703A CN106703703A (en) | 2017-05-24 |
| CN106703703B true CN106703703B (en) | 2019-10-18 |
Family
ID=58911672
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710077277.8A Active CN106703703B (en) | 2017-02-14 | 2017-02-14 | It can open and close type drill bit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106703703B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108590532A (en) * | 2018-03-30 | 2018-09-28 | 平顶山天成钻机钻具制造有限公司 | A kind of coal mine open and close type drill bit |
| CN109854181B (en) * | 2019-03-07 | 2020-09-18 | 河北锐石钻头制造有限公司 | Mining PDC drill bit with opening and closing inner through hole |
| CN113187409B (en) * | 2021-04-21 | 2022-06-24 | 中煤科工集团西安研究院有限公司 | Openable drill bit for double-wall drilling tool and construction method |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2372444Y (en) * | 1999-03-02 | 2000-04-05 | 大庆石油管理局地球物理勘探公司 | Openable hollow composite seismic drill bit |
| CN202325241U (en) * | 2011-11-28 | 2012-07-11 | 中煤科工集团重庆研究院 | Large-through-hole opening-closing type all-directional drilling drill bit |
| CN102704852A (en) * | 2012-05-25 | 2012-10-03 | 中煤科工集团西安研究院 | Hinged drill with openable and closable inner core |
| CN203035089U (en) * | 2013-04-17 | 2013-07-03 | 山东九商工程机械有限公司 | Split type special drill for drawing out methane |
| CN203531895U (en) * | 2013-11-01 | 2014-04-09 | 湖南新金刚工程机械有限公司 | Open and close drilling sampling drill bit |
| CN204457449U (en) * | 2015-02-01 | 2015-07-08 | 安徽锐远钻探设备制造有限公司 | One can open and close type diamond compact bit |
| CN204591149U (en) * | 2015-05-15 | 2015-08-26 | 山东祥德机电有限公司 | For the folding drill bit of crawler type drilling rig |
-
2017
- 2017-02-14 CN CN201710077277.8A patent/CN106703703B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2372444Y (en) * | 1999-03-02 | 2000-04-05 | 大庆石油管理局地球物理勘探公司 | Openable hollow composite seismic drill bit |
| CN202325241U (en) * | 2011-11-28 | 2012-07-11 | 中煤科工集团重庆研究院 | Large-through-hole opening-closing type all-directional drilling drill bit |
| CN102704852A (en) * | 2012-05-25 | 2012-10-03 | 中煤科工集团西安研究院 | Hinged drill with openable and closable inner core |
| CN203035089U (en) * | 2013-04-17 | 2013-07-03 | 山东九商工程机械有限公司 | Split type special drill for drawing out methane |
| CN203531895U (en) * | 2013-11-01 | 2014-04-09 | 湖南新金刚工程机械有限公司 | Open and close drilling sampling drill bit |
| CN204457449U (en) * | 2015-02-01 | 2015-07-08 | 安徽锐远钻探设备制造有限公司 | One can open and close type diamond compact bit |
| CN204591149U (en) * | 2015-05-15 | 2015-08-26 | 山东祥德机电有限公司 | For the folding drill bit of crawler type drilling rig |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106703703A (en) | 2017-05-24 |
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