CN104806169B - Hole expanding drill bit - Google Patents
Hole expanding drill bit Download PDFInfo
- Publication number
- CN104806169B CN104806169B CN201410042392.8A CN201410042392A CN104806169B CN 104806169 B CN104806169 B CN 104806169B CN 201410042392 A CN201410042392 A CN 201410042392A CN 104806169 B CN104806169 B CN 104806169B
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- China
- Prior art keywords
- oil
- reaming
- drilling rod
- cutter hub
- hole
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/26—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers
- E21B10/32—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers with expansible cutting tools
- E21B10/322—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers with expansible cutting tools cutter shifted by fluid pressure
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/44—Bits with helical conveying portion, e.g. screw type bits; Augers with leading portion or with detachable parts
Abstract
The invention provides a hole expanding drill bit. The hole expanding drill bit comprises a drilling rod, a plurality of cutter bodies, hole expanding wings, lower blades, an expanding oil cylinder, an upper blade, a slurry tube and a hydraulic oil tube assembly, wherein the cutter bodies are fixed on the blades; the lower blade is horizontally uniformly distributed and fixed on the peripheral surface of the lower part of the drilling rod in a radial form; the hole expanding wings are positioned above the lower blade and symmetrically formed along the drilling rod in the radial direction; an oscillating rod is mounted on a pin seat on the peripheral surface of the drilling rod through a hinge pin pivotal shaft, and the end of the oscillating rod is positioned into a groove in a cylinder barrel; the slurry tube is positioned in holes of a piston and a piston hole of the expanding oil cylinder. According to the hole expanding drill bit, the combined drilling and excavating structure is adopted; the hole expanding wings can be opened by operating the expanding oil cylinder while expanding the bottom or hole, besides the function of drilling and excavating general piles with the same section, so that the pile end of a bearing file and the section area of a pile body can be increased; the drill bit can be used for building various bottom expanding piles and calabash piles, and has the characteristics of being high in single pile bearing capacity, ensuring the pile diameter, and being convenient to construct, stable and reliable to work, and long in service life.
Description
Technical field
The invention belongs to a kind of drill bit of building trade construction, and in particular to a kind of reaming bit.
Background technology
With skyscraper, large bridge and city underground infrastructural project development need, bore the isometrical stake of long spire
Machine obtain it is relatively extensive use, due to isometrical pile bearing capacity it is poor.Therefore, be improve stake bearing capacity, apply in foundation engineering
Adopt the novel bearing stake such as various club-footed piles and Bottle gourd pile in work in a large number, and build these bearing piles and brill will be combined using prefabricated pile
The construction technology of reaming grouting pile-forming, i.e., drilled using the integrated drilling tool of drilling and hole expansion function, according to design requirement
To straight hole according to certain distance reaming, after the completion of drilling, soil is discharged using auger stem, after being then placed in prefabricated pile, injection is mixed
Solidifying soil, is combined into club-footed pile and Bottle gourd pile after concrete fully solidifies with prefabricated pile, and the bearing capacity of the bearing pile is typically than pre-
Make straight stake and ready-mixed concrete stake improves more than 50%.Reamer typically has two kinds of mechanical reaming type and hydraulic pressure reaming type, machine at present
The work of tool formula reamer is the reaming wing with by opening from gravity, and voluntarily receiving by lever principle when being lifted when boring under drilling rod
Hold together, this kind of reamer has that reaming size cannot ensure；And hydraulic pressure reamer carries out reaming using hydraulic pressure extension oil cylinder
And gathering, oil cylinder is extended at present and is generally disposed at drilling-rod external wall or drilling rod inner chamber, be in when extending oil cylinder in reaming procedure
Among the erosion of the materials such as compressed air, mud, the machining accuracy and sealing requirements to extending oil cylinder is very high.Accordingly, it would be desirable to
Stake end and pile body section can be expanded by a kind of adaptable drilling of engineering method therewith, the reaming bit of reaming, this reaming bit,
So as to greatly improve the bearing capacity of stake.The inflation slip casting needs of energy bored concrete pile are met simultaneously, it is ensured that the reliable operation of extension oil cylinder
Property, increase the service life.
The content of the invention
It is an object of the invention to according to the needs of building trade construction, a kind of stake end and pile body section of expanding is proposed
Reaming bit, the features such as with bearing capacity of single pile height, stake footpath Assurance of Size, work stability and reliability and long service life.
For reaching object above, solution of the present invention it is：
A kind of reaming bit, including：
Drilling rod, including hollow lever, which is provided with second be located at by two the first annular grooves and in the middle of two the first annular grooves
The annular groove group of annular groove composition, key seat, straight trough, bottom end cover and joint；
Multiple cutter hubs, each cutter hub include a cutter head and a hilt；
The reaming wing, the multiple reaming cutter hubs including fork and on fork, each reaming cutter hub include a reaming
Cutter head and a cornish bit handle, fork include long armed lever, galianconism bar and pin-and-hole；
The extension oil cylinder of drilling rod inner chamber is installed in, including cylinder barrel, piston, piston rod, fairlead and oil pipe seat；
Interior cutter hub, including interior cutter head, interior hilt；
Lower blade；Blade, slurry pipe and hydraulic oil pipe assembly；
It is characterized in that：
The straight trough of the drilling rod is arranged on its outer wall along the axially symmetric of hollow lever；The key seat is located above straight trough
On the outer wall of hollow lever；The annular groove group has two groups, is separately positioned in the hollow lever above and below straight trough
On wall, sealing ring and injection lubricating grease in which, is respectively mounted；The bottom end cover has stepped hole, is installed in drilling rod by screw
Lower surface；
The lower blade has 2-4, is fixed on the outer wall bottom of drilling rod in uniform way with horizontal radiation；The cutter hub is solid
It is scheduled on lower blade；
The big oil pocket and small oil cavity joined between piston and piston rod is respectively equipped with the cylinder barrel of the extension oil cylinder, it
Be placed in the endoporus of hollow lever by the outer peripheral face of cylinder barrel；The outer peripheral face of the cylinder barrel is provided with groove, can be in hollow lever
Hole in slide up and down；The piston is to be oriented to cylindrical tubular body with longer, the cylindrical lower stomidium for being placed in cylinder barrel in its underpart,
The cylindrical end face in its top is fixedly mounted with piston rod；Fairlead suit be fixed in piston rod lower end it is cylindrical after be screwed in the upper of cylinder barrel
End face；The piston rod inner is provided with along the symmetrical big oil pocket oil duct of its axial direction and small oil cavity oil duct, small oil cavity oil duct with
The small oil cavity of extension oil cylinder is communicated；The top of the piston is cylindrical to be provided with the big oil pocket oil circuit communicated with big oil pocket oil duct, and this is big
Oil pocket oil circuit is communicated with the big oil pocket of extension oil cylinder；The cylindrical end in the upper end of the piston rod is fixedly mounted with puts oil pipe seat, the oil pipe
In the step of the hollow lever inner chamber of drilling rod, its end is provided with to transmit the through hole of cement grout seating, axially side
To being provided with the first oil duct and the second oil duct that are arranged symmetrically and connect with big oil pocket oil duct and small oil cavity oil duct；The hydraulic oil pipe
With the first oil pipe and the second oil pipe being arranged symmetrically along its axial direction, their lower end is installed in oil pipe seat to assembly respectively
On first oil duct seat and the second oil duct seat, their upper end is installed in the coupler bore of drilling rod by fixed seat, the fixed seat
It is provided with to transmit the straight hole of cement grout；
The reaming wing has 2-4, positioned at the top of lower blade, and along drilling rod radial direction in geometrically symmetric or angularly
Alternate form is arranged；The fork is pivotally mounted on the key seat positioned at drilling rod outer peripheral face by the pin-and-hole of its corner and with bearing pin
On, its galianconism bar is placed in the groove of cylinder barrel in through the straight trough on drilling rod wall and by its end；
Upper leaf piece has 2-8, is fixed on drilling-rod external wall in uniform way with horizontal radiation and is located at lower blade
Top；
In the stepped hole of the bottom end cover that one end of the slurry pipe is installed in drilling rod, its other end passes through piston and piston rod
Endoporus after be placed in the endoporus of oil pipe seat；
The interior cutter hub has 2-4, and they are weldingly fixed at the lower surface of bottom end cover by interior hilt；
The present invention can be, the cutter hub by hilt be weldingly fixed on lower blade it is following on, cutter hub is in each inferior lobe
2-4 is installed on piece, in addition to the cutter hub on the free end of each lower blade, the position of the cutter hub on a lower blade with it is another
The position of the cutter hub on one lower blade is dislocation arrangement arrangement in a rotational direction.
The present invention it is also possible that the reaming cutter hub by cornish bit the upper surface of the long armed lever for being fixed on fork and under
End face, in addition to the reaming cutter hub on long armed lever free end, the position of the reaming cutter hub on each long armed lever and adjacent
The position of the reaming cutter hub on individual long armed lever is dislocation arrangement arrangement in a rotational direction.
It is of the invention to be also possible that in gap of the reaming wing in free state between blade, its outermost end
Tactical diameter is less than or equal to the free end tactical diameter of blade and lower blade.
The present invention is also possible that the lower blade and the free end of blade are the arc surface concentric with drilling rod, should
Netted wearing layer is equipped with arc surface.
The present invention is it is also possible that the fork opposite hollow body of rod（11）Central axis angle-square-shaped angle be >=90 °.
The present invention is also possible that the piston club shaft of the extension oil cylinder is provided with overflow valve, and it is by piston rod body
The overflow valve pipeline of setting connect with the first oil duct and the second oil duct.
The present invention is it is also possible that the fit clearance between the cylinder barrel and hollow lever of the extension oil cylinder is 0.2-0.3mm.
Reaming bit of the present invention has technical effect that, due to the combining structure using drilling and reaming, front end is spiral
Drill bit, can meet the drilling function of general cylinder pass stake；When needing to carry out base expanding and base expanding or ream operation, by operating extension
Oil cylinder, after making big oil pocket oil-feed, cylinder barrel is moved downward and promotes the galianconism bar of the reaming wing, is opened the long armed lever of the reaming wing, is expanded
Hole operation, to reach the cross-sectional area for increasing the stake end and pile body of bearing pile, effectively improves the bearing capacity of single pile.Meanwhile, this
It is bright when needing grout injection after ream operation is completed, as cement mortar is from the piston and piston rod inner positioned at cylinder barrel
Slurry pipe is directly poured into, and is in completely isolated state with extension oil cylinder, the sealing property of extension oil cylinder is effectively ensured, fully ensures that
Its job stability, increases the service life.
Description of the drawings
Fig. 1 is the structural representation of reaming bit of the present invention；
Fig. 2 is the front view of Fig. 1；
Fig. 3 is A direction views in Fig. 2；
Fig. 4 is B direction views in Fig. 2；
Fig. 5 is extension cylinder structure figure in reaming bit of the present invention；
Fig. 6 be in Fig. 5 C-C to sectional view；
Fig. 7 is E direction views in Fig. 5；
Fig. 8 is F direction views in Fig. 5；
Fig. 9 be in Fig. 5 D-D to sectional view.
Specific embodiment
Below in conjunction with embodiment described in accompanying drawing, the present invention is further illustrated.
As shown in figs 1-9, a kind of reaming bit, including：Drilling rod 1, including hollow lever 11, which is provided with by two the first rings
Groove 14 and an annular groove group for being located at the composition of the second annular groove 15 in the middle of two the first annular grooves, key seat 12, straight trough 13,16 and of bottom end cover
Joint 17；Multiple cutter hubs 2, each cutter hub 2 include a cutter head 21 and a hilt 22；The reaming wing 4, including fork 43 and is arranged on
Multiple reaming cutter hubs 42 on fork 43, each reaming cutter hub 42 include that a reaming cutter 421 and a cornish bit, 422, are put
Bar 43 includes long armed lever 431, galianconism bar 432 and pin-and-hole 433；The extension oil cylinder 5 being installed in 11 inner chamber of hollow lever of drilling rod,
It includes cylinder barrel 51, piston 52, piston rod 53, fairlead 54 and oil pipe seat 55；Interior cutter hub 9, including interior cutter head 91, interior hilt
92；Lower blade 3；Blade 6, slurry pipe 7 and hydraulic oil pipe assembly 8；It is characterized in that：The straight trough 13 of the drilling rod 1 is along hollow stem
The axially symmetric of body 11 is arranged on its outer wall；The key seat 12 is located on the outer wall of the hollow lever 11 above straight trough 13；It is described
First annular groove 14 and the second annular groove 15 are separately positioned on the inwall of the hollow lever 11 above and below straight trough 13, in which
It is respectively mounted sealing ring 141 and injection lubricating grease 151；The bottom end cover 16 has stepped hole 161, is installed in drilling rod by screw
1 lower surface；The lower blade 3 has 2-4, is fixed on the outer wall bottom of drilling rod 1 in uniform way with horizontal radiation；The knife
Body 2 is fixed on lower blade 3；The cutter hub 2 is weldingly fixed on following the 31 of lower blade 3 by hilt 22, and cutter hub 2 is each
2-4 is installed on lower blade 3, the cutter hub 2 in addition to the cutter hub 2 on the free end of each lower blade 3, on a lower blade 3
Position and another lower blade 3 on the position of cutter hub 2 be dislocation arrangement arrangement in a rotational direction；The extension oil cylinder
Big oil pocket 58 and the small oil cavity 59 joined between piston 52 and piston rod 53 is respectively equipped with 5 cylinder barrel 51, and they pass through cylinder
The outer peripheral face of cylinder 51 is placed in the endoporus of hollow lever 11；Groove 511 is additionally provided with the outer peripheral face of the cylinder barrel 51, so that cylinder barrel 51
Can slide up and down in the hole of hollow lever 11；The piston 52 is to be oriented to cylindrical tubular body with longer, and its underpart is cylindrical
The 521 lower stomidiums 512 being placed on the downside of cylinder barrel 5, the end face on its top cylindrical 522 are fixedly mounted with piston rod 53；The fairlead 54 is set with
It is screwed in the upper surface 513 of cylinder barrel 51 after being fixed on the lower end cylindrical 531 of piston rod 53；It is provided with along which inside the piston rod 53
Axial direction extends the big oil pocket oil duct 533 and small oil cavity oil duct 534 of radial symmetric, small oil cavity oil duct 534 and extension oil cylinder 5
Small oil cavity 59 is communicated；The top cylindrical 522 of the piston 52 is provided with the big oil pocket oil circuit 523 communicated with big oil pocket oil duct 533, should
Big oil pocket oil circuit 523 is communicated with the big oil pocket 58 of extension oil cylinder 5；The end of the upper end cylindrical 532 of the piston rod 53 is fixedly mounted with puts
Oil pipe seat 55, the oil pipe seat 55 are placed in the step of 11 inner chamber of hollow lever of drilling rod 1, and its end is provided with to transmit cement mortar
The through hole 551 of liquid, axially direction be provided with for being arranged symmetrically and connecting with big oil pocket oil duct 533 and small oil cavity oil duct 534
One oil duct 553 and the second oil duct 554；The piston rod 53 of the extension oil cylinder 5 is provided with overflow valve 57, and it passes through 53 bar of piston rod
The overflow valve pipeline 571 arranged on body is connected with the first oil duct 553 and the second oil duct 554；The hydraulic oil pipe assembly 8 has edge
The first oil pipe 83 and the second oil pipe 84 that its axial direction is arranged symmetrically, their lower end is installed in the first of oil pipe seat 55 respectively
On oil duct seat 5531 and the second oil duct seat 5541, their upper end is installed in 17 endoporus of joint of drilling rod 1 by fixed seat 82,
The fixed seat 82 is provided with to transmit the straight hole 821 of cement grout；The reaming wing 4 has 2-4, positioned at the top of lower blade 3,
And along 1 radial direction of drilling rod in geometrically symmetric or equiangularly spaced form arrangement；Pin-and-hole of the fork 43 by its corner
433 and it is pivotally mounted on the key seat 12 of 1 outer peripheral face of drilling rod with bearing pin, its galianconism bar 432 is through straight on 1 wall of drilling rod
Groove 13 is simultaneously placed in the groove 511 of cylinder barrel 51 by its end；The reaming cutter hub 42 is fixed on fork by cornish bit 422
The upper surface and lower surface of 43 long armed lever 431, it is in addition to the reaming cutter hub 42 on 431 free end of long armed lever, each long-armed
The position of the position of the reaming cutter hub 42 on bar 431 and the reaming cutter hub 42 on an adjacent long armed lever 431 is in direction of rotation
On be dislocation arrangement arrangement；In gap of the reaming wing 4 in free state between blade 6, its outermost end is returned
Turn diameter less than or equal to blade 6 and the free end tactical diameter of lower blade 3；In the 43 opposite hollow body of rod 11 of the fork
The angle-square-shaped angle of heart axis is >=90 °；Upper leaf piece 6 has 2-8, is fixed on drilling rod 1 in uniform way with horizontal radiation
On outer wall and positioned at the top of lower blade 3；The free end of the lower blade 3 and blade 6 is the circular arc concentric with drilling rod 1
Face, is equipped with netted wearing layer 101 on the arc surface；One end of the slurry pipe 7 is installed in the stepped hole of the bottom end cover 16 of drilling rod 1
In 161, it is placed in the endoporus of oil pipe seat 55 after its cylindrical endoporus through piston 52 and piston rod 53 of the other end；The extension
Fit clearance between the cylinder barrel 51 and hollow lever 11 of oil cylinder 5 is 0.2-0.3mm；The interior cutter hub 9 has 2-4, and they lead to
Cross interior hilt 92 to be weldingly fixed at the lower surface of bottom end cover 16.When reaming bit of the present invention is used, the brill with drilling machine first
Bar couples, while drilling rod inner oil tube enters flowline with extension oil cylinder being connected；Starting drilling machine rotates drilling rod, and lower blade is following
The downward drilling of cutter hub, reaches the drilling depth of design requirement.When needing to carry out reaming to drilling, by operating the liquid of drilling machine
Pressure system, makes the big oil pocket oil-feed of extension oil cylinder, its cylinder barrel expand downwards liter in drilling rod inner chamber and expand by groove pushing tow thereon
The galianconism bar of hole wing fork, is flared out fork, positioned at the reaming cutter hub cutting soil of the upper and lower end face of the long armed lever of fork
Layer, is forming the hole body that a stake footpath expands near the portion's reaming of pile bottom hole, so as to complete the construction operation of base expanding and base expanding bearing pile；
Additionally, according to design needs, reaming can be carried out along the distance of stake holes length direction certain intervals and form some expansion hole bodies, it is complete
Into the construction operation of cucurbit bearing pile；After the completion of drilling machine reaming, operation extension oil cylinder is boring its small oil tank oil-feed, cylinder barrel
Bar inner chamber expands the galianconism bar for rising simultaneously pushing tow reaming wing fork upwards, reaming flapwise contract, the reaming bit is just carried with drilling rod
Go out outside pore-forming.In reaming procedure, can be by means of the Grouting Pipe of piston and piston rod inner positioned at extension oil cylinder to pore-forming
Interior grout injection, due to what is separated with extension oil cylinder during grout pouring completely, mud will not be formed to extension
Pollution, thus the sealing property of energy effective guarantee oil cylinder, make cylinder efficient reliable and stable, effectively increase the service life.In reaming
During drilling, if run into the hardpans such as ground and cause the reaming wing to block in pore-forming, by being installed on piston cylinder
The hydraulic oil for extending big oil pocket in oil cylinder is carried out off-load by the overflow valve on bar, withdraws the extension wing, so as to smoothly by reaming
Drill bit proposes outside pore-forming, enables extension oil cylinder to obtain safety assurance, further ensure that the service life of extension oil cylinder.
Claims (8)
1. a kind of reaming bit, including：
Drilling rod（1）, including hollow lever（11）, which is provided with by two the first annular grooves（14）It is located in the middle of two the first annular grooves with one
The second annular groove（15）The annular groove group of composition, key seat（12）, straight trough（13）, bottom end cover（16）And joint（17）；
Multiple cutter hubs（2）, each cutter hub（2）Including a cutter head（21）With a hilt（22）；
The reaming wing（4）, including fork（43）With installed in fork（43）On multiple reaming cutter hubs（42）, each reaming cutter hub
（42）Including a reaming cutter（421）With a cornish bit handle（422）, fork（43）Including long armed lever（431）, galianconism bar（432）
And pin-and-hole（433）；
It is installed in drilling rod（1）The extension oil cylinder of inner chamber（5）, including cylinder barrel（51）, piston（52）, piston rod（53）, fairlead
（54）With oil pipe seat（55）；
Interior cutter hub（9）, including interior cutter head（91）, interior hilt（92）；
Lower blade（3）；Blade（6）, slurry pipe（7）With hydraulic oil pipe assembly（8）；
It is characterized in that：
The drilling rod（1）Straight trough（13）Along hollow lever（11）Axially symmetric be arranged on its outer wall；The key seat（12）Position
In straight trough（13）The hollow lever on top（11）Outer wall on；The annular groove group has two groups, is separately positioned on positioned at straight trough（13）
Above and below hollow lever（11）Inwall on, its first annular groove（14）With the second annular groove（15）Sealing ring is respectively mounted inside
（141）With injection lubricating grease（151）；The bottom end cover（16）Periphery has some stepped holes（161）, brill is installed in by screw
Bar（1）Lower surface；
The lower blade（3）There is 2-4, drilling rod is fixed in uniform way with horizontal radiation（1）Outer wall bottom；The cutter hub
（2）It is fixed on lower blade（3）On；
The extension oil cylinder（5）Cylinder barrel（51）In be respectively equipped with and piston（52）And piston rod（53）Between the big oil pocket that joins
（58）And small oil cavity（59）, they pass through cylinder barrel（51）Outer peripheral face be placed in hollow lever（11）Endoporus；The cylinder barrel（51）
Outer peripheral face on be additionally provided with groove（511）, so that cylinder barrel 51 can be in hollow lever（11）Hole in slide up and down；The piston
（52）It is to be oriented to cylindrical tubular body with longer, its underpart is cylindrical（521）It is placed in cylinder barrel（51）The lower stomidium of downside（512）,
Its top is cylindrical（522）End face be fixedly mounted with piston rod（53）；The fairlead（54）Suit is fixed on piston rod（53）Lower end
It is cylindrical（531）After be screwed in cylinder barrel（51）Upper surface（513）；The piston rod（53）Inside is provided with and extends along its axial direction
The big oil pocket oil duct of radial symmetric（533）With small oil cavity oil duct（534）, small oil cavity oil duct（534）With extension oil cylinder（5）Little oil
Chamber（59）Communicate；The piston（52）Top it is cylindrical（522）It is provided with and big oil pocket oil duct（533）The big oil pocket oil circuit for communicating
（523）, the big oil pocket oil circuit（523）With extension oil cylinder（5）Big oil pocket（58）Communicate；The piston rod（53）Upper end it is cylindrical
（532）End be fixedly mounted with and put oil pipe seat（55）, the oil pipe seat（55）It is placed in drilling rod（1）Hollow lever（11）The step of inner chamber
It is interior, it is provided with to transmit the through hole of cement grout in its end（551）, its edge axial direction be provided be arranged symmetrically and with it is big
Oil pocket oil duct（533）With small oil cavity oil duct（534）First oil duct of connection（553）With the second oil duct（554）；The hydraulic oil pipe
Assembly（8）With the first oil pipe being arranged symmetrically along its axial direction（83）With the second oil pipe（84）, their lower end is respectively admittedly
Loaded on oil pipe seat（55）The first oil duct seat（5531）With the second oil duct seat（5541）On, their upper end passes through fixed seat（82）
It is installed in drilling rod（1）Joint（17）In endoporus, the fixed seat（82）It is provided with to transmit the straight hole of cement grout（821）；
The reaming wing（4）There is 2-4, positioned at lower blade（3）Top, and along drilling rod（1）Radial direction in geometrically symmetric or
Equiangularly spaced form arrangement；The fork（43）By the pin-and-hole of its corner（433）And be pivotally mounted on bearing pin and be located at
Drilling rod（1）The key seat of outer peripheral face（12）On, its galianconism bar（432）Through drilling rod（1）Straight trough on wall（13）And by its end
Portion is placed in cylinder barrel（51）Groove（511）It is interior；
Upper leaf piece（6）There is 2-8, drilling rod is fixed in uniform way with horizontal radiation（1）On outer wall and positioned at lower blade
（3）Top；
The slurry pipe（7）One end be installed in drilling rod（1）Bottom end cover（16）Stepped hole（161）Interior, its other end is passed through
Piston（52）And piston rod（53）Endoporus after be placed in oil pipe seat（55）Endoporus in；
The interior cutter hub（9）There is 2-4, they pass through interior hilt（92）It is weldingly fixed on bottom end cover（16）Lower surface at.
2. reaming bit according to claim 1, it is characterised in that：The cutter hub（2）By hilt（22）It is welded and fixed
In lower blade（3）It is following（31）On, cutter hub（2）In each lower blade（3）Upper installation 2-4, except each lower blade（3）'s
Cutter hub on free end（2）In addition, a lower blade（3）On cutter hub（2）Position and another lower blade（3）On cutter hub
（2）Position in a rotational direction be dislocation arrangement arrangement.
3. reaming bit according to claim 1, it is characterised in that：The reaming cutter hub（42）By cornish bit handle
（422）It is fixed on fork（43）Long armed lever（431）Upper surface and lower surface, except long armed lever（431）Expansion on free end
Hole cutter hub（42）In addition, each long armed lever（431）On reaming cutter hub（42）Position and an adjacent long armed lever（431）On
Reaming cutter hub（42）Position in a rotational direction be dislocation arrangement arrangement.
4. reaming bit according to claim 1, it is characterised in that：The reaming wing（4）It is located in free state
Blade（6）Between gap in, its outermost end tactical diameter be less than or equal to blade（6）And lower blade（3）Free end return
Turn diameter.
5. reaming bit according to claim 1, it is characterised in that：The lower blade（3）And blade（6）Free end
It is and drilling rod（1）Concentric arc surface, is equipped with netted wearing layer on the arc surface（101）.
6. reaming bit according to claim 1, it is characterised in that：The fork（43）The opposite hollow body of rod（11）In
The angle-square-shaped angle of heart axis is >=90 °.
7. reaming bit according to claim 1, it is characterised in that：The extension oil cylinder（5）Piston rod（53）On set
There is overflow valve（57）, it passes through piston rod（53）The overflow valve pipeline arranged on the body of rod（571）With the first oil duct（553）With second
Oil duct（554）Connection.
8. reaming bit according to claim 1, it is characterised in that：The extension oil cylinder（5）Cylinder barrel（51）With it is hollow
The body of rod（11）Between fit clearance be 0.2-0.3mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410042392.8A CN104806169B (en) | 2014-01-29 | 2014-01-29 | Hole expanding drill bit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410042392.8A CN104806169B (en) | 2014-01-29 | 2014-01-29 | Hole expanding drill bit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104806169A CN104806169A (en) | 2015-07-29 |
| CN104806169B true CN104806169B (en) | 2017-03-22 |
Family
ID=53691323
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410042392.8A Active CN104806169B (en) | 2014-01-29 | 2014-01-29 | Hole expanding drill bit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104806169B (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105178864A (en) * | 2015-09-29 | 2015-12-23 | 中煤第三建设（集团）有限责任公司 | Expanding bit |
| CN105178865B (en) * | 2015-09-30 | 2017-12-01 | 济南匠夫万自动化科技有限公司 | Stretch reaming bit and chambering process |
| CN105781424A (en) * | 2016-05-03 | 2016-07-20 | 周兆弟 | Variable-diameter drilling bit mechanism for drill stem |
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| CN104806169A (en) | 2015-07-29 |
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