CN104806169A - Hole expanding drill bit - Google Patents

Hole expanding drill bit Download PDF

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Publication number
CN104806169A
CN104806169A CN201410042392.8A CN201410042392A CN104806169A CN 104806169 A CN104806169 A CN 104806169A CN 201410042392 A CN201410042392 A CN 201410042392A CN 104806169 A CN104806169 A CN 104806169A
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CN
China
Prior art keywords
oil
blade
reaming
drilling rod
cutter hub
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Granted
Application number
CN201410042392.8A
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Chinese (zh)
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CN104806169B (en
Inventor
张国柱
朱亚萍
段国平
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SHANGHAI ENGINEERING MACHINERY Co Ltd
Original Assignee
SHANGHAI ENGINEERING MACHINERY Co Ltd
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Priority to CN201410042392.8A priority Critical patent/CN104806169B/en
Publication of CN104806169A publication Critical patent/CN104806169A/en
Application granted granted Critical
Publication of CN104806169B publication Critical patent/CN104806169B/en
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Classifications

    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00Drill bits
    • E21B10/26Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers
    • E21B10/32Drill 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
    • E21B10/322Drill 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
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00Drill bits
    • E21B10/44Bits 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

A kind of reaming bit
Technical field
The invention belongs to a kind of drill bit of building trade construction, be specifically related to a kind of reaming bit.
Background technology
Along with highrise building, large bridge and city underground engineering infrastructure development need, the isometrical stake rig of long spire is made to obtain using more widely, because isometrical pile bearing capacity is poor.Therefore, for improving the bearing capacity of stake, a large amount of novel bearing stake such as employing various expanded bore pile and Bottle gourd pile etc. in basic engineering construction, and build the construction technology that these bearing pegs will adopt preformed pile combination brill reaming grouting pile-forming, namely the integrated drilling tool of boring and hole expansion function is utilized to hole, according to designing requirement to straight hole according to certain distance reaming, boring after pick completes utilizes auger stem to discharge soil, then concrete is injected after putting into preformed pile, expanded bore pile and Bottle gourd pile is combined into preformed pile after concrete fully solidifies, the bearing capacity of this bearing peg generally improves more than 50% than prefabricated straight stake and ready-mixed concrete stake.Current reamer generally has mechanical reaming type and hydraulic pressure reaming type two kinds, the work of mechanical type reamer is that the reaming wing is opened by from gravity with when boring under drilling rod, and draw in voluntarily by lever principle when promoting, there is the problem that reaming size cannot ensure in this kind of reamer; And hydraulic pressure reamer utilizes hydraulic pressure expansion oil cylinder to carry out reaming and gathering, current expansion oil cylinder is generally arranged in drilling-rod external wall or drilling rod inner chamber, among the erosion being in the material such as compressed air, mud when expanding oil cylinder in reaming procedure, to the machining accuracy of expansion oil cylinder and sealing requirements very high.Therefore, the boring needing a kind of engineering method with it to adapt, the reaming bit of reaming, stake end and pile body section can expand by this reaming bit, thus greatly improve the bearing capacity of stake.Meet the inflation slip casting needs of energy castinplace pile simultaneously, ensure the functional reliability of expansion oil cylinder, increase the service life.
Summary of the invention
The object of the invention is to, according to the needs of building trade construction, propose a kind of reaming bit that can expand stake end and pile body section, there is the features such as bearing capacity of single pile is high, stake footpath Assurance of Size, work stability and reliability and long service life.
For reaching above object, solution of the present invention is:
A kind of reaming bit, comprising:
Drilling rod, comprises hollow lever, and it is provided with and is positioned at by two the first annular grooves and one annular groove group, key seat, straight trough, bottom end cover and the joint that two first the second annular grooves in the middle of annular groove form;
Multiple cutter hub, each cutter hub comprises a cutter head and a hilt;
The reaming wing, comprise fork and be arranged on the multiple reaming cutter hubs on fork, each reaming cutter hub comprises a reaming cutter and a cornish bit handle, and fork comprises long-armed bar, galianconism bar and pin-and-hole;
Be installed in the expansion oil cylinder of drilling rod inner chamber, comprise cylinder barrel, piston, piston rod, fairlead and oil pipe seat;
Interior cutter hub, comprises interior cutter head, interior hilt;
Lower blade; Blade, slurry pipe and hydraulic oil pipe assembly;
It is characterized in that:
The straight trough of described drilling rod is symmetricly set on its outer wall along the axis of hollow lever; Described key seat is positioned on the outer wall of the hollow lever above straight trough; Described annular groove group has two groups, is separately positioned on the inwall of the hollow lever be positioned at above and below straight trough, installs sealing ring respectively and inject lubricating grease in it; Described bottom end cover has stepped hole, is installed in the lower surface of drilling rod by screw;
Described lower blade has 2-4, is fixed on the outer wall bottom of drilling rod with horizontal radiation in uniform way; Described cutter hub is fixed on lower blade;
The large oil pocket be respectively equipped with in the cylinder barrel of described expansion oil cylinder and join between piston and piston rod and small oil cavity, they are placed in the endoporus of hollow lever by the outer peripheral face of cylinder barrel; The outer peripheral face of described cylinder barrel is provided with groove, can slide up and down in the hole of hollow lever; Described piston is the tubular body with longer guiding cylindrical, and its underpart cylindrical is placed in the lower stomidium of cylinder barrel, and the end face of its top cylindrical is fixedly mounted with piston rod; The upper surface in cylinder barrel is screwed after described fairlead suit is fixed in the lower end cylindrical of piston rod; Described piston rod inner is provided with large oil pocket oil duct along its axial direction symmetry and small oil cavity oil duct, and small oil cavity oil duct communicates with the small oil cavity of expansion oil cylinder; The top cylindrical of described piston is provided with the large oil pocket oil circuit communicated with large oil pocket oil duct, and this large oil pocket oil circuit communicates with the large oil pocket of expansion oil cylinder; The end fixing apparatus oil pipe seat of the upper end cylindrical of described piston rod, this oil pipe seat is placed in the step of hollow drill pipe inner chamber of drilling rod, its end is provided with the through hole transmitting cement grout, and axially direction is provided with and is arranged symmetrically with and the first oil duct be communicated with small oil cavity oil duct with large oil pocket oil duct and the second oil duct; Described hydraulic oil pipe assembly has the first oil pipe and the second oil pipe that are arranged symmetrically with along its axial direction, on the first oil duct seat that their lower end is installed in oil pipe seat respectively and the second oil duct seat, their upper end is installed in the coupler bore of drilling rod by holder, and this holder is provided with the straight hole transmitting cement grout;
The described reaming wing has 2-4, is positioned at the top of lower blade, and be the symmetrical or angularly alternate form layout of geometry along drilling rod radial direction; Described fork by the pin-and-hole of its corner and be pivotally mounted on bearing pin be positioned at drilling rod outer peripheral face key seat on, its galianconism bar is through the straight trough on drilling rod wall and be placed in the groove of cylinder barrel by its end;
Described blade has 2-8, to be fixed in uniform way on drilling-rod external wall and to be positioned at the top of lower blade with horizontal radiation;
One end of described slurry pipe is installed in the stepped hole of the bottom end cover of drilling rod, and its other end is placed in the endoporus of oil pipe seat through the endoporus of piston and piston rod;
Described interior cutter hub has 2-4, and they are weldingly fixed on the soffit place of bottom end cover by interior hilt;
The present invention can be, described cutter hub by hilt be weldingly fixed on lower blade following on, cutter hub installs 2-4 on each lower blade, except the cutter hub on the free end of each lower blade, the position of the cutter hub on the position of the cutter hub on a lower blade and another lower blade is misplace to arrange and arrange in a rotational direction.
The present invention can also be, described reaming cutter hub by cornish bit the upper surface of long-armed bar and the lower surface that are fixed on fork, except the reaming cutter hub on long-armed bar free end, the position of the reaming cutter hub on the position of the reaming cutter hub on each long-armed bar and adjacent long-armed bar is misplace to arrange and arrange in a rotational direction.
The present invention can also be, in the gap of the described reaming wing when 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 can also be, the free end of described lower blade and blade is the arc surface with drilling rod concentric, and this arc surface is equipped with netted wearing layer.
The present invention can also be, the angle-square-shaped angle of the central axis of the described fork opposite hollow body of rod (11) is >=90 °.
The present invention can also be, the piston rod body of rod of described expansion oil cylinder is provided with overflow valve, and it is communicated with the second oil duct with the first oil duct by the overflow valve pipeline of the setting in the piston body of rod.
The present invention can also be, the fit clearance between the cylinder barrel of described expansion oil cylinder and hollow lever is 0.2-0.3mm.
The technique effect of reaming bit of the present invention is, owing to adopting the combining structure of boring pick and reaming, front end is augers, can meet the brill pick function of general cylindrical pass stake; When needs carry out at the bottom of expansion or ream operation time, by operation expansion oil cylinder, after making large oil pocket oil-feed, cylinder barrel moves downward and promotes the galianconism bar of the reaming wing, open the long-armed bar of the reaming wing, carry out ream operation, increase the stake end of bearing peg and the cross-sectional area of pile body to reach, effectively improve the bearing capacity of single pile.Simultaneously, when the present invention needs grout injection after completing ream operation, because cement paste directly pours into from the slurry pipe of the piston and piston rod inner that are positioned at cylinder barrel, completely isolated state is in expansion oil cylinder, effective sealing performance ensureing expansion oil cylinder, its job stability of abundant guarantee, increases the service life.
Accompanying drawing explanation
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 view in Fig. 1;
Fig. 4 is B direction view in Fig. 1;
Fig. 5 expands 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 view in Fig. 5;
Fig. 8 is F direction view in Fig. 5;
Fig. 9 be in Fig. 5 D-D to sectional view.
Detailed description of the invention
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, comprising: drilling rod 1, comprises hollow lever 11, it is provided with the annular groove group, key seat 12, straight trough 13, bottom end cover 16 and the joint 17 that are made up of two the first annular grooves 14 and second annular groove 15 being positioned at two the first annular groove centres; Multiple cutter hub 2, each cutter hub 2 comprises cutter head 21 and a hilt 22; The reaming wing 4, comprises fork 43 and is arranged on the multiple reaming cutter hubs 42 on fork 43, and each reaming cutter hub 42 comprises a reaming cutter 421 and a cornish bit 422, and fork 43 comprises long-armed bar 431, galianconism bar 432 and pin-and-hole 433; Be installed in the expansion oil cylinder 5 in hollow lever 11 inner chamber of drilling rod, it comprises cylinder barrel 51, piston 52, piston rod 53, fairlead 54 and oil pipe seat 55; Interior cutter hub 9, comprises 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 described drilling rod 1 is symmetricly set on its outer wall along the axis of hollow lever 11; Described key seat 12 is positioned on the outer wall of the hollow lever 11 above straight trough 13; Described first annular groove 14 and the second annular groove 15 are separately positioned on the inwall of the hollow lever 11 be positioned at above and below straight trough 13, install sealing ring 141 respectively and inject lubricating grease 151 in it; Described bottom end cover 16 has stepped hole 161, is installed in the lower surface of drilling rod 1 by screw; Described lower blade 3 has 2-4, is fixed on the outer wall bottom of drilling rod 1 with horizontal radiation in uniform way; Described cutter hub 2 is fixed on lower blade 3; Described cutter hub 2 is weldingly fixed on following 31 of lower blade 3 by hilt 22, cutter hub 2 installs 2-4 on each lower blade 3, except the cutter hub 2 on the free end of each lower blade 3, the position of the cutter hub 2 on the position of the cutter hub 2 on a lower blade 3 and another lower blade 3 is misplace to arrange and arrange in a rotational direction; The large oil pocket 58 be respectively equipped with in the cylinder barrel (51) of described expansion oil cylinder 5 and join between piston (52) and piston rod (53) and small oil cavity 59, they are placed in the endoporus of hollow lever 11 by the outer peripheral face of cylinder barrel 51; The outer peripheral face of described cylinder barrel 51 is also provided with groove 511, can slides up and down in the hole of hollow lever 11 to make cylinder barrel 51; Described piston 52 is for having the tubular body of longer guiding cylindrical, and its underpart cylindrical 521 is placed in the lower stomidium 512 on the downside of cylinder barrel 5, and the end face of its top cylindrical 522 is fixedly mounted with piston rod 53; The upper surface 513 in cylinder barrel 51 is screwed after described fairlead 54 suit is fixed on the lower end cylindrical 531 of piston rod 53; Described piston rod 53 inside is provided with the large oil pocket oil duct 533 and the small oil cavity oil duct 534 that extend radial symmetric along its axial direction, and small oil cavity oil duct 534 communicates with the small oil cavity 59 of expansion oil cylinder 5; The top cylindrical 522 of described piston 52 is provided with the large oil pocket oil circuit 523 communicated with large oil pocket oil duct 533, and this large oil pocket oil circuit 523 communicates with the large oil pocket 58 of expansion oil cylinder 5; The end fixing apparatus oil pipe seat 55 of the upper end cylindrical 532 of described piston rod 53, this oil pipe seat 55 is placed in the step of hollow drill pipe 11 inner chamber of drilling rod 1, its end is provided with the through hole 551 transmitting cement grout, and axially direction is provided with and is arranged symmetrically with and the first oil duct 553 and the second oil duct 554 be communicated with small oil cavity oil duct 534 with large oil pocket oil duct 533; The piston rod 53 of described expansion oil cylinder 5 is provided with overflow valve 57, and it is communicated with the second oil duct 554 with the first oil duct 553 by the overflow valve pipeline 571 that piston rod 53 body of rod is arranged; Described hydraulic oil pipe assembly 8 has the first oil pipe 83 and the second oil pipe 84 be arranged symmetrically with along its axial direction, on the first oil duct seat 5531 that their lower end is installed in oil pipe seat 55 respectively and the second oil duct seat 5541, their upper end is installed in joint 17 endoporus of drilling rod 1 by holder 82, and this holder 82 is provided with the straight hole 821 transmitting cement grout; The described reaming wing 4 has 2-4, is positioned at the top of lower blade 3, and be the symmetrical or angularly alternate form layout of geometry along drilling rod 1 radial direction; Described fork 43 by the pin-and-hole 433 of its corner and be pivotally mounted on bearing pin be positioned at drilling rod 1 outer peripheral face key seat 12 on, its galianconism bar 432 is through the straight trough 13 on drilling rod 1 wall and be placed in the groove 511 of cylinder barrel 51 by its end; Described reaming cutter hub 42 is fixed on upper surface and the lower surface of the long-armed bar 431 of fork 43 422 by cornish bit, except the reaming cutter hub 42 on long-armed bar 431 free end, the position of the reaming cutter hub 42 on the position of the reaming cutter hub 42 on each long-armed bar 431 and adjacent long-armed bar 431 is misplace to arrange and arrange in a rotational direction; In the gap of the described reaming wing 4 when free state between blade 6, its outermost end tactical diameter is less than or equal to the free end tactical diameter of blade 6 and lower blade 3; The angle-square-shaped angle of the central axis of the described fork 43 opposite hollow body of rod 11 is >=90 °; Described blade 6 has 2-8, to be fixed in uniform way on drilling rod 1 outer wall and to be positioned at the top of lower blade 3 with horizontal radiation; The free end of described lower blade 3 and blade 6 is the arc surface with drilling rod 1 concentric, and this arc surface is equipped with netted wearing layer 101; One end of described slurry pipe 7 is installed in the stepped hole 161 of the bottom end cover 16 of drilling rod 1, and its other end cylindrical is placed in the endoporus of oil pipe seat 55 through the endoporus of piston 52 and piston rod 53; Fit clearance between the cylinder barrel 51 of described expansion oil cylinder 5 and hollow lever 11 is 0.2-0.3mm; Described interior cutter hub 9 has 2-4, and they are weldingly fixed on the soffit place of bottom end cover 16 by interior hilt 92.When reaming bit of the present invention uses, first connects with the drilling rod of auger, simultaneously drilling rod inner oil tube with expand oil cylinder and pass in and out oil pipe and be connected; Starting auger makes drilling rod rotate, and the following cutter hub of lower blade bores pick downwards, reaches the drilling depth of designing requirement.When needs carry out reaming to boring, by operating the hydraulic system of auger, make the large oil pocket oil-feed of expansion oil cylinder, its cylinder barrel expands downwards at drilling rod inner chamber and to rise and by the galianconism bar of the groove pushing tow reaming wing fork on it, fork is outwards opened, the reaming cutter hub being positioned at the upper and lower end face of the long-armed bar of fork cuts soil layer, is forming the hole body of a stake footpath expansion, thus complete the construction operation expanding end bearing peg near becoming reaming bottom stake holes; In addition, according to design needs, can reaming be carried out along the distance of stake holes length direction certain intervals and form some expansion hole bodies, complete the construction operation of cucurbit bearing peg; After auger reaming completes, operation expansion oil cylinder makes its small oil tank oil-feed, and cylinder barrel upwards expands the galianconism bar rising also pushing tow reaming wing fork at drilling rod inner chamber, the reaming wing is inwardly shunk, and this reaming bit just proposes outside pore-forming with drilling rod.In reaming procedure, can by means of being positioned at the expansion piston of oil cylinder and the Grouting Pipe of piston rod inner to pore-forming grout injection, due to what separate with expansion oil cylinder completely in grout pouring process, the pollution of mud can not be formed to expansion, thus can the sealing performance of effective guarantee oil cylinder, make cylinder efficient reliable and stable, effectively increase the service life.In reamer pick process, if run into the hardpans such as ground when causing the reaming wing to block in pore-forming, by the overflow valve be installed on piston cylinder bar, the hydraulic oil of oil pocket large in expansion oil cylinder is carried out off-load, the expansion wing is regained, thus can smoothly reaming bit be proposed outside pore-forming, make expansion oil cylinder obtain safety assurance, guarantee the application life of expanding oil cylinder further.

Claims (8)

1. a reaming bit, comprising:
Drilling rod (1), comprise hollow lever (11), its be provided with by two the first annular grooves (14) and one be positioned at annular groove group that two first the second annular grooves (15) in the middle of annular groove form, key seat (12), straight trough (13), bottom end cover (16) and joint (17);
Multiple cutter hub (2), each cutter hub (2) comprises a cutter head (21) and a hilt (22);
The reaming wing (4), comprise fork (43) and be arranged on the multiple reaming cutter hubs (42) on fork (43), each reaming cutter hub (42) comprises a reaming cutter (421) and cornish bit handle (422), and fork (43) comprises long-armed bar (431), galianconism bar (432) and pin-and-hole (433);
Be installed in the expansion oil cylinder (5) of drilling rod (1) inner chamber, comprise cylinder barrel (51), piston (52), piston rod (53), fairlead (54) and oil pipe seat (55);
Interior cutter hub (9), comprises 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 described drilling rod (1) is symmetricly set on its outer wall along the axis of hollow lever (11); Described key seat (12) is positioned on the outer wall of hollow lever (11) on straight trough (13) top; Described annular groove group has two groups, is separately positioned on the inwall of the hollow lever (11) be positioned at above and below straight trough (13), installs sealing ring (141) respectively and injects lubricating grease (151) in its first annular groove (14) and the second annular groove (15); Described bottom end cover (16) periphery has some stepped holes (161), is installed in the lower surface of drilling rod (1) by screw;
Described lower blade (3) has 2-4, is fixed on the outer wall bottom of drilling rod (1) with horizontal radiation in uniform way; Described cutter hub (2) is fixed on lower blade (3);
The large oil pocket (58) be respectively equipped with in the cylinder barrel (51) of described expansion oil cylinder (5) and join between piston (52) and piston rod (53) and small oil cavity (59), they are placed in the endoporus of hollow lever (11) by the outer peripheral face of cylinder barrel (51); The outer peripheral face of described cylinder barrel (51) is also provided with groove (511), can slides up and down in the hole of hollow lever (11) to make cylinder barrel 51; Described piston (52) is for having the tubular body of longer guiding cylindrical, and its underpart cylindrical (521) is placed in the lower stomidium (512) of cylinder barrel (51) downside, and the end face of its top cylindrical (522) is fixedly mounted with piston rod (53); The upper surface (513) in cylinder barrel (51) is screwed after described fairlead (54) suit is fixed on the lower end cylindrical (531) of piston rod (53); Described piston rod (53) inside is provided with the large oil pocket oil duct (533) and the small oil cavity oil duct (534) that extend radial symmetric along its axial direction, and small oil cavity oil duct (534) communicates with the small oil cavity (59) of expansion oil cylinder (5); The top cylindrical (522) of described piston (52) is provided with the large oil pocket oil circuit (523) communicated with large oil pocket oil duct (533), and this large oil pocket oil circuit (523) communicates with the large oil pocket (58) of expansion oil cylinder (5); End fixing apparatus oil pipe seat (55) of the upper end cylindrical (532) of described piston rod (53), this oil pipe seat (55) is placed in the step of hollow drill pipe (11) inner chamber of drilling rod (1), be provided with the through hole (551) transmitting cement grout in its end, be provided with at its edge axial direction and be arranged symmetrically with and the first oil duct (553) be communicated with small oil cavity oil duct (534) with large oil pocket oil duct (533) and the second oil duct (554); Described hydraulic oil pipe assembly (8) has the first oil pipe (83) and the second oil pipe (84) that are arranged symmetrically with along its axial direction, on the first oil duct seat (5531) that their lower end is installed in oil pipe seat (55) respectively and the second oil duct seat (5541), their upper end is installed in joint (17) endoporus of drilling rod (1) by holder (82), and this holder (82) is provided with the straight hole (821) transmitting cement grout;
The described reaming wing (4) has 2-4, is positioned at the top of lower blade (3), and be the symmetrical or angularly alternate form layout of geometry along drilling rod (1) radial direction; Described fork (43) is by the pin-and-hole (433) of its corner and be pivotally mounted on bearing pin and be positioned on the key seat (12) of drilling rod (1) outer peripheral face, and its galianconism bar (432) is through the straight trough (13) on drilling rod (1) wall and be placed in the groove (511) of cylinder barrel (51) by its end;
Described blade (6) has 2-8, to be fixed in uniform way on drilling rod (1) outer wall and to be positioned at the top of lower blade (3) with horizontal radiation;
One end of described slurry pipe (7) is installed in the stepped hole (161) of the bottom end cover (16) of drilling rod (1), and its other end is placed in the endoporus of oil pipe seat (55) through the endoporus of piston (52) and piston rod (53);
Described interior cutter hub (9) has 2-4, and they are weldingly fixed on the soffit place of bottom end cover (16) by interior hilt (92).
2. reaming bit according to claim 1, it is characterized in that: described cutter hub (2) is weldingly fixed on following (31) of lower blade (3) by hilt (22), cutter hub (2) is each lower blade (3) upper installation 2-4, except the cutter hub (2) on the free end of each lower blade (3), the position of the cutter hub (2) on the position of the cutter hub (2) on a lower blade (3) and another lower blade (3) is misplace to arrange and arrange in a rotational direction.
3. reaming bit according to claim 1, it is characterized in that: described reaming cutter hub (42) is fixed on (422) by cornish bit upper surface and the lower surface of the long-armed bar (431) of fork (43), except the reaming cutter hub (42) on long-armed bar (431) free end, the position of the reaming cutter hub (42) on the position of the reaming cutter hub (42) on each long-armed bar (431) and adjacent long-armed bar (431) is misplace to arrange and arrange in a rotational direction.
4. reaming bit according to claim 1, it is characterized in that: the described reaming wing (4) is positioned at the gap between blade (6) when free state, its outermost end tactical diameter is less than or equal to the free end tactical diameter of blade (6) and lower blade (3).
5. reaming bit according to claim 1, is characterized in that: the free end of described lower blade (3) and blade (6) is the arc surface with drilling rod (1) concentric, this arc surface is equipped with netted wearing layer (101).
6. reaming bit according to claim 1, is characterized in that: the angle-square-shaped angle of the central axis of described fork (43) the opposite hollow body of rod (11) is >=90 °.
7. reaming bit according to claim 1, it is characterized in that: the piston rod (53) of described expansion oil cylinder (5) is provided with overflow valve (57), it is communicated with the second oil duct (554) with the first oil duct (553) by the overflow valve pipeline (571) that piston rod (53) body of rod is arranged.
8. reaming bit according to claim 1, is characterized in that: the fit clearance between the cylinder barrel (51) of described expansion oil cylinder (5) and hollow lever (11) is 0.2-0.3mm.
CN201410042392.8A 2014-01-29 2014-01-29 Hole expanding drill bit Active CN104806169B (en)

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CN104806169B CN104806169B (en) 2017-03-22

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Cited By (10)

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CN105178864A (en) * 2015-09-29 2015-12-23 中煤第三建设(集团)有限责任公司 Expanding bit
CN105178865A (en) * 2015-09-30 2015-12-23 济南匠夫万自动化科技有限公司 Retractable hole dilating drill and hole dilating technology
CN105781424A (en) * 2016-05-03 2016-07-20 周兆弟 Variable-diameter drilling bit mechanism for drill stem
CN105822234A (en) * 2016-05-03 2016-08-03 周兆弟 Drill rod assembly with drillable expanded bit for piling machine
CN106368256A (en) * 2016-10-08 2017-02-01 郑州神利达钻采设备有限公司 Drilling excavation rod
CN106437527A (en) * 2016-06-24 2017-02-22 中国电力科学研究院 Broaching drill bit and drilling machine provided with broaching drill bit
CN107059871A (en) * 2017-03-08 2017-08-18 沈健龙 The stake equipment of the expansion based on existing stake that a kind of municipal road and bridge engineering is used
CN110158584A (en) * 2019-06-18 2019-08-23 蒿振侠 Four limbs bilayer drill configurations
CN110469272A (en) * 2019-07-31 2019-11-19 中国一冶集团有限公司 A kind of construction of pile foundation casing follow-up step reaming and recyclable device
CN111376058A (en) * 2020-04-22 2020-07-07 华衍民 Multi-dimensional processing intelligent robot in material

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CN107059871A (en) * 2017-03-08 2017-08-18 沈健龙 The stake equipment of the expansion based on existing stake that a kind of municipal road and bridge engineering is used
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CN110158584A (en) * 2019-06-18 2019-08-23 蒿振侠 Four limbs bilayer drill configurations
CN110469272A (en) * 2019-07-31 2019-11-19 中国一冶集团有限公司 A kind of construction of pile foundation casing follow-up step reaming and recyclable device
CN110469272B (en) * 2019-07-31 2020-10-23 中国一冶集团有限公司 Reaming and recovering device for pile foundation casing follow-up construction
CN111376058A (en) * 2020-04-22 2020-07-07 华衍民 Multi-dimensional processing intelligent robot in material

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