CN103046872A - Combined multistage mud crushing drill - Google Patents
Combined multistage mud crushing drill Download PDFInfo
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- CN103046872A CN103046872A CN2013100220717A CN201310022071A CN103046872A CN 103046872 A CN103046872 A CN 103046872A CN 2013100220717 A CN2013100220717 A CN 2013100220717A CN 201310022071 A CN201310022071 A CN 201310022071A CN 103046872 A CN103046872 A CN 103046872A
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Abstract
The invention discloses a combined multistage mud chip crushing drill which comprises an upper cutter plate, a centering drill, a plurality of blades and a plurality of crushing teeth. The centering drill is welded in the middle portion of the upper cutter plate, two main blades of the centering drill are bilaterally symmetric arc blades; the plurality of blades and the plurality of crushing teeth are all arranged on the upper surface of the upper cutter plate; the tooth profile of each breaking tooth is axis-symmetric and forms a conical degree in the height direction, and one end is wider than the other. In the process of a trenchless drilling, the centering drill firstly contacts a gravel soil, and with a specific structure, can play a centering and guiding role and carry out cutting and chip removing on the middle portion of the gravel soil. The two tooth profiles have different functions and mutually affects the breaking function of rocks to enable the rock breaking to be more easier, so that the combined multistage mud chip crushing drill can provide the mud chips needed by the mud chip pneumatic conveying.
Description
Technical field
The present invention relates to town road construction facility, particularly a kind of combined broken spare drill bit.
Background technology
Trenchless technology refers to not excavate in the situation of groove on ground the construction technology of laying, repairing and changing underground pipeline and cable.Because it has the advantages such as speed of application is fast, little to the ground interference, integrated cost is low, safety is good, is applied to more and more in the construction of town road in recent years.Although the non-excavation pipe construction technique of recent domestic is very fast with the ratio of equipment development, the function automaticity is also more and more higher.But most of non-excavation pipeline construction occupation area of equipment all greatly, equipment price is expensive and adopt water under high pressure mud system to realize spoil disposal, do so not only waste water resource and the energy, and the slime water after a large amount of flushings is difficult to carry out mud-water separation, without the slime water of mud-water separation environment also caused more serious pollution.Therefore, that research and development are fit to is that the non-excavation pipeline construction of town road in China city requires, can be the demand of era development on sidewalk and flower bed excavation non-excavation town road construction drill technology and equipment working pit, that environment pollution is little, and how the transportation problem of consequent spare solves, aobvious important especially.
Pneumatic Conveying Technology is to utilize air-flow to carry a kind of method of bulk materials in pipeline, namely utilizes the air-flow with certain pressure and certain speed, a kind of conveying device of carrying bulk materials.In the last few years, Pneumatic Conveying Technology develops very soon, owing to it has the conveying that the advantages such as pipe arrangement is flexible, the efficient high cost is low, the system sealing environment is good, easy to maintenance are widely used in the materials such as grain, cement, flyash, chemical material, breeze, salt, flour, molding sand.Although strength is carried than the machinery conveying aforementioned many advantages are arranged, it also exists some problems, and is larger such as power demand; Be not suitable for that granularity is large, density is large, viscosity is large and conveying of the higher material of be difficult to the suspend material that circles in the air and water content etc.Applicant's imagination is separated into the bolt stream that is comprised of spare plug and gas plug by vibratory impulse air-blade type air-transport system with spare, spare is carried out the dry method strength carry.So not only improved efficiency of construction, and can solve preferably the problem that at present domestic and international waterpower carries the muddy water of spare existence to be difficult to separate, thereby the sanitation of environment around the construction is improved.According to pneumatic conveying principle, want to guarantee the reliability of dry method strength conveying spare, the spare under needing to bore is more broken better, preferably is loose spare shape, because the drilling of earth and the drilling of metal have very big difference, although earth is than easy bore many of metal, its viscosity is larger, and broken spare is difficult formation, and when containing large ovum gravel in the stratum, obtain comparatively difficulty of desirable particle size, for this reason, in the urgent need to a kind of combined broken spare drill bit for non-excavation boring.
Summary of the invention
The objective of the invention is to solve the problem that prior art exists, provide a kind of suitable strength to carry a kind of combined broken spare drill bit of the needed broken spare of spare.
The technical scheme that realizes the object of the invention is a kind of combined multistage broken spare drill bit, comprises upper tool pan, pilot bit, a plurality of blade and a plurality of crushing teeth; Described pilot bit and the welding of upper tool pan middle part, two main swords of described pilot bit are symmetrical Circular Nose Cutting Edge; Described a plurality of blade and a plurality of crushing teeth all are arranged on the upper surface of upper tool pan; The profile of tooth section of described each crushing teeth becomes axial symmetry, forms tapering on the short transverse, and an end is wider than the other end.
The quantity of described crushing teeth is 36, and described 36 crushing teeths are separately positioned on the eight equal parts line of upper tool pan, and becomes on the line that 5 intervals arrange on 4, one line.
The quantity of described blade is 36, and the blade of described 36 diamond materials is separately positioned on the eight equal parts line that staggers with the eight equal parts line that crushing teeth is set on the upper tool pan, and becomes on the line that 5 intervals arrange on 4, one line.
Described a kind of combined multistage broken spare drill bit also comprises a plurality of chip-removal holes that are arranged on the upper tool pan.
The quantity of described chip-removal hole is 36, and described 36 chip-removal holes are separately positioned on the eight equal parts line that all staggers with the eight equal parts line that crushing teeth and blade are set on the upper tool pan, and becomes on the line that 5 intervals arrange on 4, one line; And the aperture of a plurality of chip-removal holes on every bisectrix becomes large gradually from the upper tool pan center toward edge direction.
Described pilot bit also comprises the spiral chip-breaker that is arranged on the asymmetrical a plurality of varying pitchs offered on the rear knife face that links to each other with two main swords.
Every main sword of described pilot bit is no more than the short sword of 30mm by multistage length; Described chip-breaker is arranged between the two sections short swords, and the groove width of each chip-breaker is no more than 30mm.
Described a kind of combined multistage broken spare drill bit also comprises conical disc and 20 cutting teeths that are welded on the conical disc; Described pilot bit is positioned at the upper tool pan bottom and is the cone bar, welding helical blade and 10 stirring blades on the described cone bar; Thereby between upper tool pan and conical disc, form the two-stage crushing storehouse.
Described a kind of combined multistage broken spare drill bit also comprises lower cutterhead; Be connected by outer sleeve between described upper tool pan and the lower cutterhead; Described pilot bit and and lower cutterhead between sliding bearing is housed; The endoporus of described sliding bearing cooperates with the pilot bit gap, and interference is connected between cylindrical and the lower cutterhead; The bottom surface of described upper tool pan is corresponding with the upper surface of upper tool pan is provided with 36 blades, 36 crushing teeths and 36 chip-removal holes; Same rule is provided with 36 blades, 36 crushing teeths and 36 chip-removal holes on the bottom surface according to upper tool pan on the upper surface of described lower cutterhead, and stagger with the position of blade, crushing teeth and chip-removal hole on the bottom surface of upper tool pan, thereby between upper tool pan and lower cutterhead, form the two-stage crushing storehouse.
Described a kind of combined multistage broken spare drill bit also comprises the gear mud pan; Described gear mud pan is arranged on the outward flange of upper tool pan.
Adopted technique scheme, the present invention has following beneficial effect: (1) the present invention is a kind of combined drill bit, pilot bit, blade, crushing teeth the three mutually combine, common next broken spare, pilot bit has adopted the main sword structure of symmetrical Circular Nose Cutting Edge so that it has good centering pilot in design, and because crushing teeth when work, wearing and tearing on all directions are different, in contact area, the time that participates in broken rock everywhere is different, therefore the present invention is according to waiting wearing and tearing principle, crushing teeth profile of tooth section configuration is the axial symmetry flute profile, formerly contact the position of gravel, size design slightly larger, and designed tapering in short transverse, this tooth is compared with hemi-spherical ended shape insert, because the bizet height is higher, can reach the inaccessiable degree of depth of hemi-spherical ended shape insert, so providing, combined drill bit of the present invention is fit to the needed broken spare of strength conveying spare.
(2) carry the broken spare that requires owing to want to obtain the strength dry method, just require in the process of soil body shearing slip, it is inconsistent to be sheared the spare sliding velocity of getting off, the i.e. spare slippage that will misplace in producing the spare process, the present invention adopts the mode of offering chip-breaker at knife face, make spare because the dislocation and fracture, consider simultaneously the viscosity of spare, in order to guarantee its fluency when the rake face chip removal, chip-breaker adopts the unsymmetric structure of varying pitch, and the unsymmetric structure i.e. chip-breaker at two places staggers mutually, so not only can play the chip breaking effect, and bore lower spare and do not interfere with each other mutually, be conducive to the spare discharge.And helicoid is taked the design of varying pitch, can reduce spare at the resistance of drill bit shaft to flow process, creeps in the working angles at earth, makes the rotary speed of spare on the variable-pitch auger face different, thereby more is conducive to produce broken spare.
(3) according to pneumatic conveying principle, it is less to be transferred the material particle, and the reliability of conveying is higher.Therefore, chip-breaker is more close better in theory, but too much chip-breaker can reduce stock-removing efficiency again.So the present invention allows the length of each section main cutting edge be no more than 30mm, thereby make the particle diameter of spare particle be no more than 30mm, well ensured the strength conveying.
(4) the present invention is in order to make rubble, soil bits more can meet the requirement that the dry method strength is carried, also designed the two-stage crushing storehouse, after the one-level fragmentation, rubble, native bits can be discharged to by the hole on the cutterhead in the two-stage crushing storehouse, carry out two-stage crushing, carry spare for the non-excavation dry method of layer of gravel strength technical guarantee is provided.
(5) the present invention prevents rubble, native considering to be worth doing in the slit that is stuck between upper tool pan and the outer sleeve, has welded a gear mud pan at outer sleeve.
(6) the present invention is when carrying out the boring of non-excavation, and pilot bit contacts first the gravel soil layer, because the distinctive structure of pilot bit can play the centering pilot effect, can the gravel soil layer in centre be cut again, chip removal.Smashing, roll rolling, scraping the effect of cutting of disc drill bit because the contact area of cutterhead and the scope of operation is larger, can be given full play in most of zone around the pilot bit.It is different to add the effect separately of two kinds of profiles of tooth, the fragmentation of rock is influenced each other, so that fractured rock is more prone to.
Description of drawings
Content of the present invention is easier to be expressly understood in order to make, and the below is according to specific embodiment and by reference to the accompanying drawings, and the present invention is further detailed explanation, wherein
Fig. 1 is the structural representation of a kind of scheme of the present invention.
Fig. 2 is the schematic top plan view of Fig. 1.
Fig. 3 is the structural representation of another kind of scheme of the present invention.
Fig. 4 is the schematic top plan view of Fig. 3.
Attached number in the figure is:
The specific embodiment
(embodiment 1)
See Fig. 1 and Fig. 2, a kind of combined multistage broken spare drill bit of present embodiment comprises upper tool pan 1, pilot bit 2,36 blades 3,36 crushing teeths 4,36 chip-removal holes 5, conical disc 6 and five cutting teeths 7.
Pack into the bellmouth at upper tool pan 1 middle part of pilot bit 2, contact circumference place adopts welding manner, and two main swords 21 of pilot bit 2 are symmetrical Circular Nose Cutting Edge; With rear knife face 2-2 that two main sword 2-1 link to each other on the asymmetrical spiral chip-breaker 2-3 that offers a plurality of varying pitchs; Every main sword 2-1 of pilot bit 2 is no more than the short sword 2-1-1 of 30mm by multistage length; Chip-breaker 2-3 is arranged between the two sections short sword 2-1-1, and the groove width of each chip-breaker 2-3 is no more than 30mm.It is cone bar 2-4 that pilot bit 2 is positioned at upper tool pan 1 bottom, cone bar 2-4 upper welding helical blade 2-5 and 10 stirring blade 2-6.Pilot bit 2 has adopted in design symmetrical Circular Nose Cutting Edge structure so that it has good centering pilot.Carry needed broken spare for obtaining strength, on two place's helicoids of pilot bit 2, designed respectively several chip-breakers 2-3.According to pneumatic conveying principle, it is less to be transferred the material particle, and the reliability of conveying is higher.Therefore, chip-breaker 2-3 is more close better, but too much chip-breaker 2-3 can reduce stock-removing efficiency again.When design, allow the length of the main sword 2-1 of each section be no more than 30mm, thereby make the particle diameter of spare particle be no more than 30mm.In addition, the chip-breaker 2-3 at two places adopts asymmetrical design, namely mutually staggers, and so not only can play the chip breaking effect, and bores lower spare and do not interfere with each other mutually, is conducive to the spare discharge.For reducing spare at the resistance of drill bit shaft to flow process, helicoid is taked the design of varying pitch, creeps in the working angles at earth, makes the rotary speed of spare on the variable-pitch auger face different, thereby more is conducive to produce broken spare.
The blade 3 of 36 diamond materials is separately positioned on the eight equal parts line on the upper tool pan 1, and becomes on the line that 5 intervals arrange on 4, one line.
36 crushing teeths 4 are separately positioned on the eight equal parts line of upper tool pan 1, stagger with the eight equal parts line that blade 3 is set, and become on the line that 5 intervals arrange on 4, one line.The profile of tooth section of each crushing teeth 4 becomes axial symmetry, forms tapering on the short transverse, and an end is wider than the other end.
36 chip-removal holes 5 are separately positioned on the eight equal parts line that all staggers with the eight equal parts line that crushing teeth 4 and blade 3 are set on the upper tool pan 1, and become on the line that 5 intervals arrange on 4, one line; And the aperture of a plurality of chip-removal holes 5 on every bisectrix becomes large gradually from upper tool pan 1 center toward edge direction.
As shown in Figure 2, the arrangement regulation of blade 3, crushing teeth 4 and chip-removal hole 5 is: 4 crushing teeths 4---4 blades 3---4 chip-removal holes 5---5 chip-removal holes 5 of 5 crushing teeths 4---5 blades 3---.
Conical disc 6 by four sector ring boards through punching press, be welded, before the welding should be first on every a slice sector ring board with 7 welding of 5 cutting teeths on it.
Between upper tool pan 1 and conical disc 6, form the two-stage crushing storehouse.When carrying out the boring of non-excavation, pilot bit 2 contacts first the gravel soil layer, because pilot bit 2 distinctive structures can play the centering pilot effect, can the gravel soil layer in centre be cut again, chip removal.Smashing, roll rolling, scraping the effect of cutting of disc drill bit because upper tool pan 1 is larger with the contact area of the scope of operation, can be given full play in most of zone around the pilot bit.It is different to add the effect separately of two kinds of profiles of tooth, the fragmentation of rock is influenced each other, so that fractured rock is more prone to.After the one-level fragmentation, rubble, native bits can be discharged to by the hole on the cutterhead in the two-stage crushing storehouse.Rotation along with the cone bar 2-4 of pilot bit 2, carry at helical blade 2-5 in the middle of the process of rubble, soil bits, 10 stirring blade 2-6 on it can not only play stirring action, can also further cut, the cutting teeth 7 at it and edge is joined together, and has played the effect of secondary cutting.
(embodiment 2)
A kind of combined multistage broken spare drill bit of present embodiment and the difference of embodiment 1 are the two-stage crushing storehouse, and this two-stage crushing storehouse is made of with upper tool pan 2 lower cutterhead 8, outer sleeve 9.Between pilot bit 2 and the lower cutterhead 8 sliding bearing 10 is housed; Be matched in clearance between the endoporus of sliding bearing 10 and the pilot bit 2, be connected for interference between cylindrical and the lower cutterhead 8.Be connected by outer sleeve 9 between upper tool pan 1 and the lower cutterhead 8; The bottom surface of upper tool pan 1 is corresponding with the upper surface of upper tool pan 1 is provided with 36 blades 3,36 crushing teeths 4 and 36 chip-removal holes 5; Same rule is provided with 36 blades 3,36 crushing teeths 4 and 36 chip-removal holes 5 on the bottom surface according to upper tool pan 1 on the upper surface of lower cutterhead 8, and staggers with the position of blade 3, crushing teeth 4 and chip-removal hole 5 on the bottom surface of upper tool pan 1; Thereby between upper tool pan 1 and lower cutterhead 8, form the two-stage crushing storehouse; Gear mud pan 11 is arranged on the outward flange of upper tool pan 1, is used for preventing rubble, native considering to be worth doing in the slit that is stuck between upper tool pan and the outer sleeve.
After the one-level fragmentation, rubble, native bits can be discharged to by the hole on the cutterhead in the two-stage crushing storehouse.Owing between pilot bit 2 and the lower cutterhead 8 sliding bearing is housed, its endoporus and pilot bit 2 adopt matched in clearance, and cylindrical adopts interference to be connected with lower cutterhead 8, like this, when pilot bit 2 drove upper tool pan 1 rotation, lower cutterhead 8 can and then not rotate, and existed between them to relatively rotate.This is just so that the rubble, the soil bits that enter in the two-stage crushing storehouse by second-time breakage and cutting, are carried desired broken spare thereby can obtain the dry method strength under the interaction of aspectant blade 3 and crushing teeth 4.
Above-described specific embodiment; purpose of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the above only is specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. combined multistage broken spare drill bit is characterized in that: comprise upper tool pan (1), pilot bit (2), a plurality of blade (3) and a plurality of crushing teeth (4); Described pilot bit (2) and the welding of upper tool pan (1) middle part, two main swords (21) of described pilot bit (2) are symmetrical Circular Nose Cutting Edge; Described a plurality of blade (3) and a plurality of crushing teeth (4) all are arranged on the upper surface of upper tool pan (1); The profile of tooth section of described each crushing teeth (4) becomes axial symmetry, forms tapering on the short transverse, and an end is wider than the other end.
2. combined multistage broken spare drill bit according to claim 1, it is characterized in that: the quantity of described crushing teeth (4) is 36, described 36 crushing teeths (4) are separately positioned on the eight equal parts line of upper tool pan (1), and become on the line that 5 intervals arrange on 4, one line.
3. combined multistage broken spare drill bit according to claim 2, it is characterized in that: the quantity of described blade (3) is 36, the blade of described 36 diamond materials (3) is separately positioned on the eight equal parts line that the upper eight equal parts line with crushing teeth (4) is set of upper tool pan (1) staggers, and becomes on the line that 5 intervals arrange on 4, one line.
4. combined multistage broken spare drill bit according to claim 3 is characterized in that: also comprise a plurality of chip-removal holes (5) that are arranged on the upper tool pan (1).
5. combined multistage broken spare drill bit according to claim 4, it is characterized in that: the quantity of described chip-removal hole (5) is 36, described 36 chip-removal holes (5) are separately positioned on the eight equal parts line that the upper eight equal parts line with crushing teeth (4) and blade (3) are set of upper tool pan (1) all staggers, and become on the line 5 intervals settings on 4, one line; And the aperture of a plurality of chip-removal holes (5) on every bisectrix becomes large gradually from upper tool pan (1) center toward edge direction.
6. combined multistage broken spare drill bit according to claim 5, it is characterized in that: described pilot bit (2) also comprises the spiral chip-breaker (2-3) that is arranged on the asymmetrical a plurality of varying pitchs offered on the rear knife face (2-2) that links to each other with two main swords (2-1).
7. combined multistage broken spare drill bit according to claim 6, it is characterized in that: every main sword (2-1) of described pilot bit (2) is no more than the short sword (2-1-1) of 30mm by multistage length; Described chip-breaker (2-3) is arranged between two sections short swords (2-1-1), and the groove width of each chip-breaker (2-3) is no more than 30mm.
8. combined multistage broken spare drill bit according to claim 7 is characterized in that: also comprise conical disc (6) and be welded on 20 cutting teeths (7) on the conical disc (6); Described pilot bit (2) is positioned at upper tool pan (1) bottom and is cone bar (2-4), described cone bar (2-4) upper welding helical blade (2-5) and 10 stirring blades (2-6); Thereby between upper tool pan (1) and conical disc (6), form the two-stage crushing storehouse.
9. combined multistage broken spare drill bit according to claim 7 is characterized in that: also comprise lower cutterhead (8); Be connected by outer sleeve (9) between described upper tool pan (1) and the lower cutterhead (8); Described pilot bit (2) and and lower cutterhead (8) between sliding bearing (10) is housed; The endoporus of described sliding bearing (10) cooperates with pilot bit (2) gap, is connected for interference between cylindrical and the lower cutterhead (8); The bottom surface of described upper tool pan (1) is corresponding with the upper surface of upper tool pan (1) is provided with 36 blades (3), 36 crushing teeths (4) and 36 chip-removal holes (5); Same rule is provided with 36 blades (3), 36 crushing teeths (4) and 36 chip-removal holes (5) on the bottom surface according to upper tool pan (1) on the upper surface of described lower cutterhead (8), and staggers with the position of blade (3), crushing teeth (4) and chip-removal hole (5) on the bottom surface of upper tool pan (1); Thereby between upper tool pan (1) and lower cutterhead (8), form the two-stage crushing storehouse.
10. combined multistage broken spare drill bit according to claim 9 is characterized in that: also comprise gear mud pan (11); Described gear mud pan (11) is arranged on the outward flange of upper tool pan (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310022071.7A CN103046872B (en) | 2013-01-21 | 2013-01-21 | Combined multistage mud crushing drill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310022071.7A CN103046872B (en) | 2013-01-21 | 2013-01-21 | Combined multistage mud crushing drill |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103046872A true CN103046872A (en) | 2013-04-17 |
| CN103046872B CN103046872B (en) | 2014-10-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310022071.7A Expired - Fee Related CN103046872B (en) | 2013-01-21 | 2013-01-21 | Combined multistage mud crushing drill |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108005574A (en) * | 2017-12-05 | 2018-05-08 | 吕小红 | A kind of removal guide pile casting formula drilling equipment |
| CN108915602A (en) * | 2018-07-11 | 2018-11-30 | 江苏师范大学 | A kind of bilayer dust suction drill bit |
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| JP2004003126A (en) * | 2002-04-08 | 2004-01-08 | Hiromi Kuwahata | Excavation method for burying concrete pile and its device |
| CN1982650A (en) * | 2005-12-14 | 2007-06-20 | 中国神华能源股份有限公司 | Composite balancing earth-pressure shielding machine |
| CN202300201U (en) * | 2011-09-14 | 2012-07-04 | 上海工程机械厂有限公司 | Combined drill bit |
| CN202417318U (en) * | 2011-12-30 | 2012-09-05 | 刘海兰 | Non-excavation hole drilling mud chip drill |
| CN203145835U (en) * | 2013-01-21 | 2013-08-21 | 常州信息职业技术学院 | Combined multi-stage mud detritus crushing drill bit |
-
2013
- 2013-01-21 CN CN201310022071.7A patent/CN103046872B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004003126A (en) * | 2002-04-08 | 2004-01-08 | Hiromi Kuwahata | Excavation method for burying concrete pile and its device |
| CN1982650A (en) * | 2005-12-14 | 2007-06-20 | 中国神华能源股份有限公司 | Composite balancing earth-pressure shielding machine |
| CN202300201U (en) * | 2011-09-14 | 2012-07-04 | 上海工程机械厂有限公司 | Combined drill bit |
| CN202417318U (en) * | 2011-12-30 | 2012-09-05 | 刘海兰 | Non-excavation hole drilling mud chip drill |
| CN203145835U (en) * | 2013-01-21 | 2013-08-21 | 常州信息职业技术学院 | Combined multi-stage mud detritus crushing drill bit |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108005574A (en) * | 2017-12-05 | 2018-05-08 | 吕小红 | A kind of removal guide pile casting formula drilling equipment |
| CN108915602A (en) * | 2018-07-11 | 2018-11-30 | 江苏师范大学 | A kind of bilayer dust suction drill bit |
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| Publication number | Publication date |
|---|---|
| CN103046872B (en) | 2014-10-15 |
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Granted publication date: 20141015 Termination date: 20180121 |