CN108798527B - Composite drilling tool - Google Patents
Composite drilling tool Download PDFInfo
- Publication number
- CN108798527B CN108798527B CN201710285996.9A CN201710285996A CN108798527B CN 108798527 B CN108798527 B CN 108798527B CN 201710285996 A CN201710285996 A CN 201710285996A CN 108798527 B CN108798527 B CN 108798527B
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- Prior art keywords
- cutting
- wing
- hollow
- pipe
- hollow pipe
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- 238000005553 drilling Methods 0.000 title claims abstract description 50
- 239000002131 composite material Substances 0.000 title claims abstract description 18
- 238000003756 stirring Methods 0.000 claims abstract description 42
- 239000007788 liquid Substances 0.000 claims abstract description 27
- 238000007789 sealing Methods 0.000 claims abstract description 17
- 230000002457 bidirectional effect Effects 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 11
- 230000002093 peripheral effect Effects 0.000 claims description 7
- 230000003014 reinforcing effect Effects 0.000 claims description 5
- 238000009434 installation Methods 0.000 claims description 3
- 239000004568 cement Substances 0.000 abstract description 11
- 239000002002 slurry Substances 0.000 abstract description 9
- 238000002347 injection Methods 0.000 abstract 1
- 239000007924 injection Substances 0.000 abstract 1
- 238000010276 construction Methods 0.000 description 16
- 239000002689 soil Substances 0.000 description 10
- 238000011065 in-situ storage Methods 0.000 description 4
- 239000007921 spray Substances 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 239000000956 alloy Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000005574 cross-species transmission Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 210000003437 trachea Anatomy 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-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
- E21B10/42—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
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/46—Concrete or concrete-like piles cast in position ; Apparatus for making same making in situ by forcing bonding agents into gravel fillings or the soil
-
- 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
- E21B10/46—Drill bits characterised by wear resisting parts, e.g. diamond inserts
- E21B10/54—Drill bits characterised by wear resisting parts, e.g. diamond inserts the bit being of the rotary drag type, e.g. fork-type bits
-
- 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
- E21B10/60—Drill bits characterised by conduits or nozzles for drilling fluids
- E21B10/602—Drill bits characterised by conduits or nozzles for drilling fluids the bit being a rotary drag type bit with blades
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Geochemistry & Mineralogy (AREA)
- Structural Engineering (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Earth Drilling (AREA)
Abstract
A composite drilling tool comprises a hollow pipe body with an outer joint, a first cutting wing, a second cutting wing, a front end cutting body, a plurality of groups of stirring blades, a wear-resisting plate and a sealing sleeve; the hollow pipe body is provided with a grouting pipe, an air pipe and a curing liquid pipe, the upper end of the hollow pipe body is positioned at the outer joint fixing ring, and the lower end of the hollow pipe body is provided with a valve; the sealing sleeve is a bidirectional sealing sleeve, one half of the sealing sleeve is arranged in the stepped counter bore of the fixing ring, and the other half of the sealing sleeve protrudes out of the upper surface of the fixing ring; a plurality of groups of stirring blades are arranged at intervals up and down on the outer wall of the hollow tube body; the first and second cutting wings are radially arranged on the outer wall of the hollow tube body; the front end cutting body is positioned on the outer surface of the lower end part of the hollow pipe body; the wear-resisting plate is fixedly arranged on the stirring blade, the free end arc surfaces of the first cutting wing and the second cutting wing which are coaxial with the hollow pipe body; the first, second and third cutting bodies are made of cemented carbide pieces. The invention has the characteristics of high strength of the cutting cutter body, high drilling capability, full stirring, separate injection of cement slurry, high-pressure gas and curing liquid, and the like, and effectively improves the drilling efficiency and the safety.
Description
Technical Field
The invention belongs to a drilling tool, and particularly relates to a composite drilling tool of a stirring pile drilling machine for constructing an underground diaphragm wall and improving and reinforcing a soft soil foundation.
Background
With the rapid development of national economy, urban rail transit construction, development and utilization of underground space, garbage landfill site isolation, river dam foundation reinforcement and other urban infrastructure are being accelerated in main cities of China, wherein a section steel cement soil composite stirring pile construction process (namely, SMW underground diaphragm wall construction process) is often applied, a hollow drill rod and a hollow drilling tool connected to an output shaft of the section steel cement soil composite stirring pile construction process are driven by a power head, drilling and stirring construction are carried out by a front tool body after the drilling tool rotates, for example, in the underground diaphragm wall construction process, high-pressure gas and curing liquid are sprayed into the underground while drilling and stirring the drilling tool, so as to accelerate the flow and stirring of underground soil, cement paste with a certain proportion is sprayed through the hollow drill rod and the hollow drilling tool after the drilling and stirring process is completed, finally all the drill rod and the drilling tool are pulled out, the section steel is inserted into the underground diaphragm wall groove body, and the in-site soil containing cement slurry is maintained for a period of time, so that an underground diaphragm wall is formed. The SMW underground continuous wall construction process has the characteristics of good water stopping performance, small influence on surrounding environment and buildings, large wall thickness, large depth, low construction period, low construction cost and the like, and is widely applied and popularized.
In the existing stirring pile drilling machine, a set of background system for supplying cement slurry, high-pressure air and curing liquid is needed to be equipped in the construction process of an underground diaphragm wall, a pipeline for conveying the cement slurry, the high-pressure air and the curing liquid is connected with a rotary joint at the upper end of a driving power head of the drilling machine, the rotary joint is communicated with inner cavities of a drill rod and a drilling tool, when the drilling tool drills and stirs in situ soil along with the rotation of the power head and the drill rod, the curing liquid, the high-pressure air and the cement slurry are sprayed, and because the inner cavities of the hollow drill rod are regulated and controlled one by one and are not injected in stages directly, the high-pressure air, the curing liquid and the cement slurry are needed to be switched at the upper end of the power head in the construction process, so that great inconvenience is caused to constructors, and meanwhile, the conditions of slurry leakage and high-pressure air spraying hurt people often occur at the joint of the drill rod and the drilling tool exist. Along with the continuous increase of underground drilling depth, because of the conditions of complicated stratum, soft and hard soil inclusion and the like, in the rotary drilling, lifting and stirring processes of a drill rod of a stirring pile drilling machine, the lowest drilling tool bears larger drilling and stirring resistance, so that the cutting edge of a cutting tool bit and blades are seriously worn, the construction operation efficiency is influenced, and the in-situ soil stirring in a groove body is uneven, thereby effectively guaranteeing the quality of the groove body of the underground diaphragm wall.
Disclosure of Invention
The invention mainly aims to overcome the defects of the existing stirring pile drilling machine, and provides a composite drilling tool with high hard strength of a cutting tool bit, high wear resistance of a cutting fin, sufficient stirring, high sealing performance and convenient operation, which effectively ensures that the drilling machine applies curing liquid, sprays high-pressure gas and sprays cement slurry at different stages, thereby ensuring the construction quality and the construction safety of an underground continuous wall.
The solution adopted by the invention for achieving the purpose is as follows:
a composite drilling tool, the drilling tool comprising:
the grouting device comprises a hollow pipe body, a grouting pipe, an air pipe and a curing liquid pipe, wherein the grouting pipe, the air pipe and the curing liquid pipe are arranged in the inner cavity of the hollow pipe body, a first valve is arranged on the outer end face of a lower end cover of the hollow pipe body, a second valve and a third valve are arranged below the outer wall of the hollow pipe body, an outer hexagonal joint is arranged at the upper end of the hollow pipe body, and a supporting groove is formed in the outer wall of the hollow pipe body;
a first cutting blade comprising a first cutting blade body and a first airfoil;
a second cutting blade comprising a second cutting blade body and a second airfoil;
the front end cutting body comprises a third cutting cutter body and a third cutter handle;
a plurality of groups of stirring blades, wear-resistant plates and sealing sleeves;
the method is characterized in that:
the grouting pipe, the air pipe and the curing liquid pipe are parallel to each other in the inner cavity of the hollow pipe body; a fixed ring with a stepped counter bore is arranged at the end face of the outer hexagonal joint; the grouting pipe, the air pipe and the curing liquid pipe are respectively positioned in the air at the lower part of the stepped counter bore of the fixed ring, the lower end of the grouting pipe is connected with a first valve, and the air pipe and the curing liquid pipe are respectively connected with a second valve and a third valve through a first bent pipe and a second bent pipe at the lower part of the grouting pipe and the curing liquid pipe; the sealing sleeve is a bidirectional sealing sleeve and is provided with an upper ring groove, a lower ring groove and an outer ring groove, wherein an O-shaped ring is respectively arranged in the upper ring groove and the lower ring groove, one half of the O-shaped ring is arranged in a stepped counter bore of the fixing ring, and the other half of the O-shaped ring protrudes out of the upper end surface of the fixing ring;
the plurality of groups of stirring blades are arranged on the outer wall of the hollow tube body above the first cutting wings at intervals up and down, and the two groups of stirring blades are arranged in a crisscross manner in the radial direction of the hollow tube body to form an included angle of 90 degrees;
the first cutting wings are in a double-head form and are positioned on the hollow pipe body below the plurality of groups of stirring blades, and the first wings of the first cutting wings are arranged on the outer peripheral surface of the hollow pipe body in a radially symmetrical mode; in addition, in the double heads of the first cutting wings, a row of first cutting blades are respectively arranged on the first lower edge of each first wing, and the positions of the first cutting blades on the first lower edge of one first wing and the positions of the first cutting blades on the first lower edge of the other first wing are alternately arranged on the rotating track at intervals in other positions except that the first cutting blades on the free end of the first lower edge of each first wing are equidistantly arranged;
the second cutting wings are in a three-head form and are positioned on the hollow pipe body below the first cutting wings, and the second wings of the second cutting wings are arranged on the outer peripheral surface of the hollow pipe body at equal angles in the radial direction; in addition, in the three heads of the second cutting wings, a row of second cutting blades are respectively arranged on the second lower edge of each second wing, and the positions of the second cutting blades on the second lower edge of the first second wing and the second lower edge of the third second wing are alternately arranged on the rotating track at intervals except that the second cutting blades on the free end of the second lower edge of each second wing are equidistantly arranged;
the front end cutting bodies are respectively arranged on the lower end cover of the hollow pipe body at radial intervals, the installation direction is that the third cutting bodies are installed to face the rotation direction of the hollow pipe body, and the third cutting bodies of the front end cutting bodies are fixed on the outer end face of the lower end cover of the hollow pipe body through third cutter handles;
the wear-resisting plates are fixedly arranged on the stirring blade, the first cutting wing, the second cutting wing and the free end arc surface of the front end cutting body coaxial with the hollow pipe body respectively.
The invention can be that the blade surfaces of the plurality of groups of stirring blades incline towards one direction, and an included angle B1=35-45 degrees is formed between the blade surfaces and the horizontal section of the hollow pipe body.
The first wing face of each first wing of the first cutting wings inclines towards one direction, and an included angle B2=40-55 degrees is formed between the first wing face and the horizontal section of the hollow pipe body.
The second wing face of each second wing of each second cutting wing inclines towards one direction, and an included angle B3=50-60 degrees is formed between the second wing face and the horizontal section of the hollow pipe body.
In the invention, each second fin of the second cutting fins is provided with a reinforcing rib and is connected to the outer peripheral surface of the hollow tube body.
The first cutting blade body of the first cutting wing, the second cutting blade body of the second cutting wing and the third cutting blade body of the front end cutting body are all made of hard alloy.
Drawings
FIG. 1 is a schematic view of a composite drilling tool of the present invention;
FIG. 2 is a left side view of FIG. 1;
FIG. 3 is a cross-sectional view taken along B-B in FIG. 2;
FIG. 4 is a bottom view of FIG. 2;
FIG. 5 is an enlarged view of part A of FIG. 2;
fig. 6 is a top view of fig. 1, principally showing the structural arrangement of the outer hexagonal joint ends.
Detailed Description
The composite drilling tool of the present invention is further described below with reference to the accompanying drawings.
A composite drilling tool, the drilling tool 1 comprising: the grouting device comprises a hollow pipe body 10, a grouting pipe 11, an air pipe 12 and a curing liquid pipe 13 which are arranged in the inner cavity of the hollow pipe body, a first valve 15 positioned on the outer end face of a lower end cover 14 of the hollow pipe body, a second valve 16 and a third valve 17 positioned below the outer wall of the hollow pipe body, and an outer hexagonal joint 18 positioned at the upper end of the hollow pipe body, wherein the outer wall of the hollow pipe body is provided with a supporting groove 19; a first cutting blade 3 including a first cutting blade body 31 and a first wing; a second cutting blade 4 including a second cutting blade body 41 and a second fin; a front end cutting body 5 including a third cutting blade body 51 and a third handle; a plurality of groups of stirring blades 2, wear-resistant plates 6 and sealing sleeves 7; wherein:
the grouting pipe 11, the air pipe 12 and the curing liquid pipe 13 are parallel to each other in the inner cavity of the hollow pipe body 10; the end face of the outer hexagonal joint 18 positioned at the upper end of the hollow pipe body 10 is provided with a fixed ring 182 with a stepped counter bore 1821; the upper ends of the grouting pipe 11, the air pipe 12 and the curing liquid pipe 13 are respectively positioned in the lower holes of the stepped counter bores 1821 of the fixed ring 182, the lower end of the grouting pipe 11 is connected with the first valve 15, and the air pipe 12 and the curing liquid pipe 13 are respectively connected with the second valve 16 and the third valve 17 through the first elbow pipe 121 and the second elbow pipe 131 at the lower parts thereof; the sealing sleeve 7 is a bidirectional sealing sleeve, and is provided with an upper ring groove and a lower ring groove, wherein an O-shaped ring is respectively arranged in the upper ring groove and the lower ring groove, one half of the O-shaped ring is arranged in a stepped counter bore 1821 of the fixed ring 182, and the other half of the O-shaped ring protrudes out of the upper surface of the fixed ring 182;
the plurality of groups of stirring blades 2 are arranged on the outer wall of the hollow pipe body 10 above the first cutting wings 3 at intervals up and down, and the two groups of stirring blades are arranged in a crisscross manner in the radial direction of the hollow pipe body 10 to form an included angle of 90 degrees; the blade surfaces 21 of the plurality of groups of stirring blades 2 incline towards one direction, and an included angle B1=35-45 degrees is formed between the blade surfaces and the horizontal section of the hollow pipe body 10;
the first cutting wings 3 are in a double-head form and are positioned on the hollow pipe body 10 below the plurality of groups of stirring blades 2, and the first wings of the first cutting wings are arranged on the outer peripheral surface of the hollow pipe body 10 in a radial symmetrical mode; in addition, in the double-end of the first cutting wing 3, a row of first cutting blades 31 are respectively arranged on the first lower edge 321, 321' of each first wing 32, 32', and the positions of the first cutting blades 31 on the first lower edge 321 of one first wing 32 and the positions of the first cutting blades 31 on the first lower edge 321' of the other first wing 32' are alternately arranged on the rotation track at intervals in other positions except that the first cutting blades 31 on the free end of the first lower edge of each first wing 32, 32' are equidistantly arranged; the first airfoil surface 322 of each first airfoil 32, 32' of the first cutting airfoil 3 is inclined toward one direction, and forms an included angle b2=40-55 degrees with the horizontal section of the hollow pipe body 10;
the second cutting wings 4 are in the form of three heads and are positioned on the hollow tube body 10 below the first cutting wings 3, and the second wings of the second cutting wings are arranged on the outer peripheral surface of the hollow tube body 10 at equal angles in the radial direction; in addition, in the three ends of the second cutting wing 4, a row of second cutting blades 41 are respectively arranged on the second lower edges 421, 421 'and 421 "of each end second wing 42, 42', 42", and the positions of the second cutting blades 41 on the second lower edge 421 of the first end second wing 42 and the positions of the second cutting blades 41 on the second lower edge 421 'of the first end second wing 42' and the positions of the second cutting blades 41 on the second lower edge 421 'of the third end second wing 42 "are alternately arranged on the rotation track in a crossing manner except that the second cutting blades 41 on the free end of the second lower edge of each end second wing 42, 42', 42" are equidistantly arranged; the second airfoil 422 of each second airfoil 42, 42', 42″ of the second cutting airfoil 4 is inclined toward one direction, and forms an included angle b3=50-60 ° with the horizontal cross section of the hollow pipe body 10; each second fin 42, 42', 42″ of the second cutting fin 4 is provided with reinforcing ribs 43, and the reinforcing ribs 43 are connected to the outer circumferential surface of the hollow tube body 10;
the front end cutting bodies 5 are arranged on the outer end face of the lower end cover 14 of the hollow pipe body 10 at radial intervals, the installation direction is that the third cutting bodies 51 are installed to face the rotation direction of the hollow pipe body 10, and the third cutting bodies 51 of the front end cutting bodies 5 are fixed on the outer end face of the lower end cover 14 of the hollow pipe body 10 through third cutter handles 52;
the wear-resistant plate 6 is fixedly arranged on the free end arc surfaces of the stirring blade 2, the first cutting wing 3, the second cutting wing 4 and the front end cutting body 5 which are coaxial with the hollow tube body 10 respectively;
the first cutting blade body 31 of the first cutting blade 3, the second cutting blade body 41 of the second cutting blade 4 and the third cutting blade body 51 of the front end cutting blade 5 are all made of cemented carbide.
According to the composite drilling tool, the plurality of groups of stirring blades which are mutually at 90-degree cross angles are arranged on the outer wall of the upper part of the hollow pipe body along the radial direction of the outer wall of the upper part of the hollow pipe body, so that the stirring uniformity of in-situ soil is greatly improved; the outer wall of the lower part of the hollow pipe body below the plurality of groups of stirring blades is provided with the first cutting wings and the second cutting wings which form different angles with the axial center direction of the hollow pipe body, and the free ends of the first cutting wings and the second cutting wings are provided with high-strength wear-resistant plates and cutting heads made of alloy materials, so that the wear resistance and the drilling capability of the drilling tool are greatly improved; through the grouting pipe, the air pipe and the solidifying liquid pipe which are arranged in the inner cavity of the hollow pipe body, the stirring pile drilling machine is convenient to apply solidifying liquid, spray high-pressure gas and spray cement slurry at different stages, the in-situ soil stirring quality is effectively controlled, and the construction quality of the underground diaphragm wall is ensured; through the seal cover that sets up in drilling tool upper end outer hexagonal department, grouting pipe, trachea and solidification liquid pipe's sealing performance when guaranteeing that drilling tool and drilling rod are connected, avoid appearing leaking thick liquid, weeping and high-pressure air and spill over, effectively improve the sealing performance of drilling tool, further improve the construction security.
Various changes and modifications can be made to the invention without departing from the general inventive concept, but, if the invention is embodied identically or equivalently, it is also within the scope of the invention.
Claims (6)
1. A composite drilling tool, the drilling tool (1) comprising:
the grouting device comprises a hollow pipe body (10), a grouting pipe (11), an air pipe (12) and a curing liquid pipe (13) which are arranged in the inner cavity of the hollow pipe body, a first valve (15) positioned on the outer end face of a lower end cover (14) of the hollow pipe body, a second valve (16) and a third valve (17) positioned below the outer wall of the hollow pipe body, and an outer hexagonal joint (18) positioned at the upper end of the hollow pipe body, wherein the outer wall of the hollow pipe body is provided with a supporting groove (19);
a first cutting blade (3) comprising a first cutting blade body (31) and a first blade;
a second cutting blade (4) comprising a second cutting blade body (41) and a second blade;
a front end cutting body (5) comprising a third cutting blade body (51) and a third blade holder;
a plurality of groups of stirring blades (2), wear-resistant plates (6) and sealing sleeves (7);
the method is characterized in that:
the grouting pipe (11), the air pipe (12) and the solidifying liquid pipe (13) are parallel to each other in the inner cavity of the hollow pipe body (10); a fixed ring (182) with a stepped counter bore (1821) is arranged at the end face of the outer hexagonal joint (18); the upper ends of the grouting pipe (11), the air pipe (12) and the curing liquid pipe (13) are respectively positioned in the lower hole of the stepped counter bore (1821) of the fixed ring (182), the lower end of the grouting pipe (11) is connected with the first valve (15), and the air pipe (12) and the curing liquid pipe (13) are respectively connected with the second valve (16) and the third valve (17) through the first bent pipe (121) and the second bent pipe (131) at the lower part of the air pipe and the curing liquid pipe; the sealing sleeve (7) is a bidirectional sealing sleeve and is provided with an upper ring groove and a lower ring groove, wherein O-shaped rings are respectively arranged in the upper ring groove and the lower ring groove, one half of the O-shaped rings are arranged in a stepped counter bore (1821) of the fixed ring (182), and the other half of the O-shaped rings are protruded on the upper surface of the fixed ring (182);
the plurality of groups of stirring blades (2) are arranged on the outer wall of the hollow tube body (10) above the first cutting wings (3) at intervals up and down, and are arranged in a crisscross manner in the radial direction of the hollow tube body (10) relative to the two groups of stirring blades to form an included angle of 90 degrees;
the first cutting wings (3) are in a double-head form and are positioned on the hollow tube body (10) below the plurality of groups of stirring blades (2), and the first wings of the first cutting wings are arranged on the outer peripheral surface of the hollow tube body (10) in a radial symmetrical mode; in addition, in the double heads of the first cutting wings (3), a row of first cutting blades (31) are respectively arranged on the first lower edge (321, 321 ') of each first wing (32, 32'), and the positions of the first cutting blades (31) on the first lower edge (321) of one first wing (32) and the positions of the first cutting blades (31) on the first lower edge (321 ') of the other first wing (32) are alternately arranged on the rotation track in a crossing way except that the first cutting blades (31) on the first lower edge free end of each first wing (32, 32') are equidistantly arranged;
the second cutting wings (4) are in a three-head form and are positioned on the hollow tube body (10) below the first cutting wings (3), and the second wings of the second cutting wings are arranged on the outer peripheral surface of the hollow tube body (10) at equal angles in the radial direction; in addition, in the three ends of the second cutting wings (4), a row of second cutting blades (41) is respectively arranged on the second lower edge (421, 421', 421 ") of each end second wing (42, 42', 42"), and the positions of the second cutting blades (41) on the second lower edge (421) of the first end second wing (42) and the positions of the second cutting blades (41) on the second lower edge (421 ') of the first end second wing (42 ') and the second lower edge (421 ") of the third end second wing (42") are alternately arranged on the rotation track in a cross manner except that the second cutting blades (41) of each end second wing (42, 42', 42 ") on the free end of the second lower edge are equidistantly arranged;
the front end cutting bodies (5) are arranged on the lower end cover (14) of the hollow pipe body (10) at radial intervals, the installation direction is that the third cutting bodies (51) are installed to face the rotation direction of the hollow pipe body (10), and the third cutting bodies (51) of the front end cutting bodies (5) are fixed on the outer end face of the lower end cover (14) of the hollow pipe body (10) through third knife handles (52);
the wear-resisting plate (6) is fixedly arranged on the free end arc surface of the stirring blade (2), the first cutting wing (3), the second cutting wing (4) and the front end cutting body (5) coaxial with the hollow tube body (10) respectively.
2. The composite drilling tool according to claim 1, characterized in that the blade surfaces (21) of the plurality of sets of stirring blades (2) are inclined in one direction, forming an angle b1=35-45 ° with the horizontal cross section of the hollow tubular body (10).
3. A composite drilling tool according to claim 1, characterized in that the first airfoil (322) of each first airfoil (32, 32') of the first cutting airfoil (3) is inclined in one direction at an angle b2=40-55 ° to the horizontal cross-section of the hollow body (10).
4. A composite drilling tool according to claim 1, characterized in that the second airfoil (422) of each second airfoil (42, 42', 42 ") of the second cutting airfoil (4) is inclined in one direction at an angle b3=50-60° to the horizontal cross-section of the hollow tubular body (10).
5. A composite drilling tool according to claim 1, characterized in that each second fin (42, 42', 42 ") of the second cutting fin (4) is provided with a reinforcing rib (43) and connects it to the outer circumferential surface of the hollow tube (10).
6. The composite drilling tool according to claim 1, characterized in that the first cutting blade (31) of the first cutting blade (3), the second cutting blade (41) of the second cutting blade (4) and the third cutting blade (51) of the front cutting blade (5) are all made of cemented carbide.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710285996.9A CN108798527B (en) | 2017-04-27 | 2017-04-27 | Composite drilling tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710285996.9A CN108798527B (en) | 2017-04-27 | 2017-04-27 | Composite drilling tool |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108798527A CN108798527A (en) | 2018-11-13 |
| CN108798527B true CN108798527B (en) | 2023-07-18 |
Family
ID=64069571
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710285996.9A Active CN108798527B (en) | 2017-04-27 | 2017-04-27 | Composite drilling tool |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108798527B (en) |
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| CN105909174A (en) * | 2016-06-28 | 2016-08-31 | 上海工程机械厂有限公司 | Stirring drilling tool |
| CN207348796U (en) * | 2017-04-27 | 2018-05-11 | 上海工程机械厂有限公司 | A kind of combination drill tool |
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| US10260287B2 (en) * | 2015-02-24 | 2019-04-16 | The Charles Machine Works, Inc. | Dual-member pipe assembly |
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| CN108798527A (en) | 2018-11-13 |
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