CN111058772A - Eccentric drilling tool - Google Patents
Eccentric drilling tool Download PDFInfo
- Publication number
- CN111058772A CN111058772A CN201911379417.2A CN201911379417A CN111058772A CN 111058772 A CN111058772 A CN 111058772A CN 201911379417 A CN201911379417 A CN 201911379417A CN 111058772 A CN111058772 A CN 111058772A
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- Prior art keywords
- eccentric
- hole
- section
- drill bit
- connecting rod
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- 238000005553 drilling Methods 0.000 title claims abstract description 53
- 239000003381 stabilizer Substances 0.000 claims abstract description 23
- 230000007704 transition Effects 0.000 claims description 3
- 239000000112 cooling gas Substances 0.000 abstract description 8
- 210000005056 cell body Anatomy 0.000 description 8
- 238000000034 method Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
- 239000007789 gas Substances 0.000 description 5
- 238000001125 extrusion Methods 0.000 description 4
- 239000011148 porous material Substances 0.000 description 4
- 239000011435 rock Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 239000000956 alloy Substances 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000009527 percussion Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000002337 anti-port Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 210000002421 cell wall Anatomy 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Images
Classifications
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- 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
- E21B7/00—Special methods or apparatus for drilling
- E21B7/28—Enlarging drilled holes, e.g. by counterboring
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- 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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
- E21B17/042—Threaded
- E21B17/043—Threaded with locking means
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- 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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/10—Wear protectors; Centralising devices, e.g. stabilisers
Abstract
The invention discloses an eccentric drilling tool, which comprises a drill bit, an eccentric reaming sleeve and a rod stabilizer, wherein the middle part of the eccentric reaming sleeve is an eccentric neck rod part, an eccentric hole of the eccentric reaming sleeve is sleeved on the eccentric neck rod part and is in running fit with the eccentric neck rod part, the front part of the drill bit is a head part, the rear part of the drill bit is a connecting rod part, the front part of the rod stabilizer is provided with a connecting hole sleeved on the outer side of the connecting rod part, the connecting hole is in threaded connection with the connecting rod part, an axial through hole which is penetrated from front to back is arranged inside the rod stabilizer, the rear side inside the drill bit is provided with a blind hole which is aligned with and communicated with the axial through hole, the bottom of the blind hole is provided with a diversion hole which extends to a drilling surface of the head part, the rear part of the connecting rod part is. The cooling gas of the flow guide channel is guided out to the threaded connection part to cool the threaded part, so that the problem that the temperature of the threaded part is high is solved.
Description
Technical Field
The invention relates to the technical field of tool instruments, in particular to an eccentric drilling tool.
Background
The percussion drill bit is widely applied to early-stage rock sample detection of a series of engineering projects such as ore detection, underground rock sample collection, constructional engineering, hydropower, ports, highways, urban construction projects and the like, and meanwhile, dust is collected, so that environmental pollution is avoided, and the percussion drill bit has a good environment-friendly effect. The drill bit is composed of a drill bit body and alloy teeth, stress waves of impact striking transmitted by the impactor or the power head are transmitted to the alloy teeth through the drill bit body, and the alloy teeth break rock to break rock.
There is an eccentric drilling tool among the percussion bit, this eccentric drilling tool mainly include drill bit, eccentric reaming cover and the stabilizer of being connected with the drill bit, and wherein the drill bit anterior segment is head, back end for connecting rod portion, middle part be eccentric neck rod portion, eccentric reaming cover's eccentric pot head is established on the eccentric neck rod portion and between normal running fit, and wherein the anterior mounting hole cover of stabilizer establishes in the connecting rod portion outside, threaded connection between and. Wherein the head mainly used drilling of drill bit, and wherein eccentric reaming cover is then at the drill bit drilling basis on further reaming, and then form with pipeline complex hole, at the in-process of drilling, pack into the pipeline in the hole simultaneously, wherein the drill bit diameter is less than the pipeline internal diameter, and eccentric reaming cover can carry out reaming work under eccentric state, and at the withdrawal state, can reduce eccentric degree, present the state of drawing close to the middle part promptly to make eccentric reaming cover all follow the pipeline lumen with the drill bit and shift out.
Wherein the rear portion of drill bit inserts in the steady pole ware, with steady pole ware threaded connection, eccentric drilling tool is at the in-process of drilling, blackens easily, generates heat in the local stress position of steady pole ware and eccentric drilling tool, and is difficult to dismantle.
In summary, how to effectively solve the problem that the stressed position is blackened and heated and is difficult to disassemble is a problem that needs to be solved urgently by those skilled in the art at present.
Disclosure of Invention
In view of the above, an object of the present invention is to provide an eccentric drilling tool, which can effectively solve the problem that the eccentric drilling tool is difficult to disassemble due to blackened and heated force-bearing position.
In order to achieve the purpose, the invention provides the following technical scheme:
an eccentric drilling tool comprises a drill bit, an eccentric reaming sleeve and a rod stabilizer, wherein the front part of the drill bit is a head part, the rear part of the drill bit is a connecting rod part, the middle part of the drill bit is an eccentric neck rod part, the eccentric hole of the eccentric reaming sleeve is sleeved on the eccentric neck rod part and is in running fit with the eccentric neck rod part, the front part of the rod stabilizer is provided with a connecting hole sleeved on the outer side of the connecting rod part, the connecting hole is connected with the connecting rod part through a thread, an axial through hole which is communicated with the front and the back is arranged in the rod stabilizer, a blind hole which is aligned with and communicated with the axial through hole is arranged at the rear side in the drill bit, a shunt hole which extends to the drill face of the head part is arranged at the bottom of the blind hole, the rear part of the connecting rod part is provided with a radially extending flow guide channel, the inner end of the flow guide channel is communicated with the axial through hole cavity or the blind hole cavity, and the outer end of the flow guide channel extends to a gap between the outer side wall of the rear part of the connecting rod part and the wall of the rear hole of the connecting hole.
In this eccentric drilling tool, when using, at the drill bit in-process forward, when leading-in to the cooling gas in the axial through-hole, the cooling gas can enter into the clearance between connecting rod portion rear portion lateral wall and the connecting hole rear portion pore wall through the water conservancy diversion passageway, then flow to threaded connection department to continue along the clearance of threaded connection department, continue to move forward, until flow out to the connecting hole outside, at the in-process of threaded connection department, can play the effect of cooling to threaded connection department. So in this eccentric drilling tool, through set up water conservancy diversion passageway in drill bit rear portion department to export the cooling gas of inside circulation to drill bit rear portion lateral surface department, and then enter into threaded connection department, cool off screw thread department, greatly reduced drill bit rear portion and threaded connection department load too big and lead to the higher problem of temperature. In conclusion, the eccentric drilling tool can effectively solve the problem that the eccentric drilling tool is difficult to disassemble due to blackened and heated stress positions.
Preferably, a groove body is formed in the end face of the rear portion of the connecting rod portion, and a groove cavity of the groove body is the flow guide channel.
Preferably, the groove body is arranged to avoid a stress area on the outer side of the rear part of the connecting rod part far away from the eccentric side of the eccentric neck rod part.
Preferably, the end of the connecting rod part is provided with three uniformly distributed groove bodies, wherein one groove body extends towards the eccentric side of the eccentric neck rod part along the eccentric direction.
Preferably, connecting rod portion includes that the periphery has connecting thread's screw thread post section, have in the connecting hole with screw thread post section threaded connection's screw thread hole section, connecting rod portion is in screw thread post section rear side has location cylinder section, the connecting hole is in screw thread hole section rear side have with location cylinder section complex location cylinder section, the location cylinder section outside is provided with the drainage groove, the one end in drainage groove with the cell body links up, and the other end extends to screw thread post section department.
Preferably, the connecting hole is provided with a flared hole section between the threaded hole section and the positioning circular hole section, the diameter of the flared hole section is continuously gradually reduced from front to back, and the rear part of the flared hole section and the front part of the positioning circular hole section are in smooth transition.
Preferably, the front section of the connecting hole is a cylindrical hole, the front hole edge of the cylindrical hole is in a radius angle shape, a limiting shoulder is arranged on one side, close to the eccentric center of the eccentric neck rod part, of the front part of the connecting rod part, a rounding angle is arranged between the limiting shoulder and the cylindrical part on the front side of the threaded column section, and the limiting shoulder abuts against the front end face of the rod stabilizer.
Preferably, one end of the eccentric reaming sleeve abuts against the head, the other end of the eccentric reaming sleeve abuts against the end of the rod stabilizer, and a rotation lock is arranged between the eccentric reaming sleeve and the drill bit so as to prevent the eccentric reaming sleeve from continuously rotating when the eccentric reaming sleeve rotates towards a preset direction to an eccentric state relative to the drill bit and prevent the eccentric reaming sleeve from continuously rotating when the eccentric reaming sleeve reversely rotates towards the preset direction to a retraction state relative to the drill bit.
Preferably, three shunting holes which are scattered and extend to the drilling surface of the head are formed in the bottom of the blind hole, and drainage grooves which are communicated with the shunting holes and lead to the side edges are correspondingly formed in the drilling surface of the head.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic three-dimensional structure of a drill bit according to an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view of an eccentric drilling tool according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a head of an eccentric drilling tool according to an embodiment of the present invention.
The drawings are numbered as follows:
the device comprises a head part 1, a threaded column section 2, a positioning cylindrical section 3, a cylindrical part 4, a threaded hole section 5, a positioning cylindrical hole section 6, a cylindrical hole 7, an eccentric reaming sleeve 8, a locking pin 9, an eccentric neck rod part 10, a blind hole 11, a shunt hole 12, a groove body 13, a drainage groove 14 and an axial through hole 15.
Detailed Description
The embodiment of the invention discloses an eccentric drilling tool, which aims to effectively solve the problem that a stressed position is blackened and heated and is difficult to disassemble.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-3, fig. 1 is a schematic three-dimensional structure diagram of a drill according to an embodiment of the present invention; FIG. 2 is a schematic cross-sectional view of an eccentric drilling tool according to an embodiment of the present invention; fig. 3 is a schematic structural diagram of a head of an eccentric drilling tool according to an embodiment of the present invention.
In one embodiment, the present embodiment provides an eccentric drilling tool, in particular comprising a drill bit, an eccentric reamer sleeve 8 and a stabilizer.
Wherein the drill bit front portion is head 1, and the rear portion is connecting rod portion, and the middle part is eccentric neck pole portion 10, wherein the steady pole ware front portion have with the cover establish the connecting hole in the connecting rod portion outside, the rear portion is the pole portion, the axis of this pole portion generally is the axis of rotation of eccentric drilling tool, wherein the axis of self of head 1 and this axis of rotation are located same straight line to in the messenger's working process, head 1 rotates around the axis of self.
The eccentric neck rod part 10 is a cylindrical rod part, and the axis of the rod part is not in the same line with the rotation axis, i.e. the axis of the eccentric neck rod part is arranged eccentrically relative to the rotation axis. Wherein eccentric borehole jack of eccentric reaming cover 8 is established on eccentric neck pole portion 10, normal running fit between and, the hole diameter of eccentric borehole equals with the outer diameter of eccentric neck pole portion 10 promptly, so that eccentric reaming cover 8 can rotate to eccentric state, and when eccentric state, the torque transmission of drill bit or steady pole ware is to eccentric reaming cover 8 department, so that eccentric reaming cover 8 can realize the reaming operation on the basis of drill bit drilling, and rotate when withdrawing the state, make eccentric side no longer the protrusion set up, in order to break away from out in can following the pipeline lumen. Specifically, wherein eccentric reaming cover 8 is whole cylindricly, and outside cylinder side axis sets up with the axis off-centre of eccentric orfice, and preferably when changeing back to the shrink state, the axis and the above-mentioned axis of rotation of the outside cylinder side of eccentric reaming cover 8, the straight line of drill bit axis place promptly is located same straight line.
Wherein threaded connection between connecting hole and the connecting rod portion, specific connecting rod portion includes that the periphery has connecting thread's screw thread column section 2, and what correspond has in the connecting hole with 2 threaded connection's of screw thread column section screw thread hole section 5 to realize threaded connection through screw thread hole section 5 and screw thread column section 2, accomplish fixed connection promptly. It should be noted that in order to ensure that the connecting rod can be inserted into the connecting hole and complete the threaded connection, the portion of the connecting rod behind the threaded post section 2 should be able to pass through the threaded hole section 5.
An axial through hole 15 which is through from front to back is formed in the rod stabilizer, a blind hole 11 which is aligned with and communicated with the axial through hole 15 is formed in the rear side of the interior of the drill bit, and a branch flow hole 12 which extends to the drilling surface of the head 1 is formed in the bottom of the blind hole 11. Wherein the rear part of the axial through hole 15 enters the gas and is guided by the axial through hole 15, so that the gas enters the blind hole 11, and the gas in the blind hole 11 enters the diversion hole 12 and flows to the front side of the head part 1, namely the front side of the drill bit from the diversion hole 12, so as to play a role of guiding the cooling gas. Of course, the dust on the front side of the head part 1 can be blown into the groove on the side surface of the eccentric drilling tool through the channel to be discharged. The bottom of the blind hole 11 is provided with a plurality of flow distribution holes 12 which are arranged in a scattered manner and extend to the drilling surface of the head 1, and the drilling surface of the head 1 is correspondingly provided with drainage grooves 14 which are communicated with the flow distribution holes 12 and lead to the side edges.
Wherein, the rear part of the connecting rod part is provided with a guide channel extending in the radial direction, and the guide channel can be arranged on the connecting rod part or on the rod stabilizer. The guide channel is only required to be capable of meeting the condition that the inner end is communicated with the hole cavity of the axial through hole 15 or the hole cavity of the blind hole 11, and the outer end extends to the gap between the outer side wall of the rear part of the connecting rod part and the hole wall of the rear part of the connecting hole, so that a part of gas led in by the axial through hole 15 can be led out to the gap between the outer side wall of the connecting rod part and the hole wall of the rear part of the connecting hole, and further the gas can flow out of.
In the eccentric drilling tool, when the eccentric drilling tool is applied, in the forward drilling process, when cooling gas is introduced into the axial through hole 15, the cooling gas can enter a gap between the outer side wall of the rear part of the connecting rod part and the hole wall of the rear part of the connecting hole through the flow guide channel, then flows to the threaded connection part, continues to move forwards along the gap of the threaded connection part until flowing out of the connecting hole, and can play a role in cooling the threaded connection part in the process of flowing through the threaded connection part. So in this eccentric drilling tool, through set up water conservancy diversion passageway in drill bit rear portion department to export the cooling gas of inside circulation to drill bit rear portion lateral surface department, and then enter into threaded connection department, cool off screw thread department, greatly reduced drill bit rear portion and threaded connection department load too big and lead to the higher problem of temperature. In conclusion, the eccentric drilling tool can effectively solve the problem that the eccentric drilling tool is difficult to disassemble due to blackened and heated stress positions.
Further, as mentioned above, the flow guide channel has various modes, and only the above requirements need to be met. Considering that the drill bit of the eccentric drilling tool is a high-strength resistant part, the whole processing difficulty is high. And the difficulty is still very big for the hole body is processed in the rod stabilizer. Based on this, the end face of the connecting rod part is preferably provided with a groove body 13, and a groove cavity of the groove body 13 is a flow guide channel. When the installation promptly, the rear portion terminal surface of connecting rod portion can offset with the hole bottom of connecting hole, and because cell body 13 has been seted up to terminal surface department, the notch of cell body 13 is sealed by the hole bottom of connecting hole, and then makes the vallecular cavity form water conservancy diversion passageway.
When the eccentric drilling tool is used, only one side of the eccentric reaming sleeve 8 with the reaming effect is stressed, so that the eccentric side of the corresponding eccentric neck rod part 10 is stressed, the whole formed lever is in a stressed state, a supporting fulcrum can be formed at the edge of an eccentric side hole of the connecting hole, the part, far away from the eccentric side, of the rear side of the connecting rod part can form a support of a lever end, the part, far away from the eccentric side, forms a stressed area, the stressed area is more stressed along with the larger lateral force borne by the head part 1, and based on the situation, the groove body 13 is preferably arranged to avoid the stressed area, far away from the eccentric side of the eccentric neck rod part 10, on the outer side of the rear part of the connecting rod part, so that the stressed area is prevented from being subjected to overlarge pressure. It should be noted that, in the case of being disposed away from the force-bearing zone, it may be disposed away from the force-bearing zone.
Specifically, the tip of the preferred connection pole portion of this department is provided with three evenly distributed's cell body 13, and one of them cell body 13 extends to eccentric neck pole portion 10 off-centre side along eccentric direction to two other cell body 13 evenly distributed of messenger in the both sides in stress area, and set up three cell body 13 evenly distributed, contained angle between each other is 120 degrees angles, so that connect pole portion tip evenly distributed cell body 13, in order to avoid stress concentration, in order to guarantee overall structure stability.
Wherein connecting hole and connecting rod portion carry out threaded connection, and specific connecting rod portion includes that the periphery has connecting thread's screw thread column section 2, and what correspond has in the connecting hole with 2 threaded connection's of screw thread column section screw thread hole section 5 to realize threaded connection through screw thread hole section 5 and screw thread column section 2, accomplish fixed connection promptly. It should be noted that in order to ensure that the connecting rod can be inserted into the connecting hole and complete the threaded connection, the portion of the connecting rod behind the threaded post section 2 should be able to pass through the threaded hole section 5.
Further, the thread is deformed and damaged due to large stress because the stress area is formed at the thread during long-term work, and the later separation is difficult. For this reason, it is preferable that the connecting rod part has a positioning cylindrical section 3 at the rear side of the threaded cylindrical section 2, and the positioning cylindrical section 3 and the threaded cylindrical section 2 can be continuously connected or provided with other structures. Wherein the connecting hole has the location circle hole section 6 with location circle post section 3 complex at the 5 rear sides of screw hole section to accomplish threaded connection back at screw thread post section 2 and screw hole section 5, wherein location circle post section 3 inserts to location circle hole section 6 in, both closely cooperate, play the effect of location axis. Wherein, clearance fit can be formed between the positioning cylindrical section 3 and the positioning circular hole section 6, and the smaller the clearance error is, the better the clearance error is.
During operation, 8 one sides atress of eccentric reaming cover, according to mechanics principle, lever theory promptly, connecting hole is along being close to one side of 8 atress of eccentric reaming cover this moment, eccentric side promptly receives the fulcrum power, and connecting rod portion rear portion tip is kept away from between one side of 8 atress of eccentric reaming cover and the connecting hole wall extrusion force has, because connecting rod portion is provided with location cylinder section 3 in 2 rear sides of threaded column section, so receive great extrusion force between location cylinder section 3 and location cylinder section 6 this moment, so the extrusion force between threaded column section 2 and threaded hole section 5 has been reduced
As mentioned above, in order to better introduce the flow guiding channel at the end face of the connecting rod portion to the threaded connection, it is preferable that a drainage groove 14 is provided outside the positioning cylindrical section 3, wherein one end of the drainage groove 14 is engaged with the groove body 13, and the other end extends to the threaded cylindrical section 2. When a plurality of the trough bodies 13 are provided, the drainage grooves 14 are arranged corresponding to the trough bodies 13 one to one, wherein the cross-sectional size and shape of the drainage grooves 14 are preferably consistent with that of the trough bodies 13, and are preferably semicircular in shape, so as to facilitate fluid flow. Namely, the end face and the side face of the positioning cylindrical section 3 are both provided with semicircular grooves.
Further, when the threaded cylindrical section 2 is screwed into the threaded hole section 5, the positioning cylindrical section 3 firstly passes through the threaded hole section 5 and then enters the positioning cylindrical section 6. Because closely cooperate between location circular hole section 6 and the location circular column section 3, and have the clearance between screw thread post section 2 and the screw thread hole section 5, lead to both axes to have the skew easily, so location circular column section 3 is difficult accurate to enter into location circular hole section 6, leads to the installation difficulty. Based on this, it is preferable here that the connection hole has a flared section with a continuously tapered aperture from front to back between the threaded hole section 5 and the positioning circular hole section 6, and the flared section back and the positioning circular hole section 6 front transition smoothly, so that the flared section functions as a guide. So that at the precession in-process, wherein during location cylinder section 3 enters into the bell mouth section first, be led to in order to guarantee the centering by the bell mouth section, then enter into location cylinder section 3 gradually again for simple to operate is simple.
Further, in order to fully position the drill bit and the rod stabilizer, the connecting hole is preferably a cylindrical hole 7 at the front side of the threaded hole section 5, and correspondingly, the connecting rod part is a cylindrical part 4 matched with the cylindrical hole 7 at the front side of the threaded cylindrical section 2, wherein the cylindrical hole 7 is preferably in clearance fit with the cylindrical part 4, and the matching precision is preferably equal to that between the positioning cylindrical section 3 and the positioning cylindrical hole section 6. For better fixing the drill bit and the shank stabilizer, it is preferable that a locking pin 9 is arranged between the cylindrical hole 7 and the cylindrical portion 4, and one half of the locking pin 9 is positioned in a groove matched with the hole wall of the cylindrical hole 7, and the other half is positioned in a groove matched with the outer side surface of the cylindrical portion 4. Wherein the locking pin 9 is generally circular in cross-section and the cylindrical bore 7 and the corresponding recess in the cylindrical portion 4 are both semi-circular.
Further, the preferred connecting hole anterior segment of here is cylinder hole 7, and the anterior hole edge of cylinder hole 7 is radius angle type, because the effect that plays the fulcrum here, adopts radius angle type, can guarantee effectively to support intensity, and then guarantees whole life. Likewise, in order to ensure the strength of the drill, it is preferable that the front part of the connecting rod part has a limiting shoulder on the side close to the eccentricity of the eccentric neck part, wherein the limiting shoulder is arranged with a round angle with the cylindrical part 4, so as to effectively avoid the easy occurrence of fracture. And the limiting shoulder is abutted against the front end face of the rod stabilizer to ensure that a part of extrusion force can be borne between the limiting shoulder and the rod stabilizer, so that the excessive pressure at the rear part of the connecting rod part is avoided.
Wherein eccentric neck pole portion 10 is located between head 1 and the connecting rod portion, and both ends link up with head 1 and connecting rod portion respectively, and wherein the rear portion terminal surface of eccentric neck pole portion 10 forms above-mentioned spacing shoulder, and in order to guarantee overall structure's intensity, preferred wherein the one end of eccentric reaming cover 8 offsets with head 1, the other end offsets with the tip of steady pole ware.
Wherein the eccentric reamer 8 is rotated on the eccentric neck shank 10 to switch between an eccentric state and a retracted state, wherein the driving of the eccentric reamer 8 in relation to the eccentric neck shank 10 can be driven by an external mechanism, but such a driving would result in a more complex overall structure, based on which it is preferred that a rotational lock is provided between the eccentric reamer 8 and the drill bit to prevent the eccentric reamer 8 from continuing to rotate when the eccentric reamer 8 rotates in relation to said drill bit in a predetermined direction to an eccentric state and to prevent the eccentric reamer 8 from continuing to rotate when the eccentric reamer 8 rotates in relation to the drill bit in the opposite direction to the predetermined direction to the retracted state. When current eccentric reaming cover 8 rotates to the withdrawal state relative to eccentric neck pole portion 10, steady pole ware at this moment drives the antiport of drill bit towards the predetermined direction, eccentric reaming cover 8 is under the frictional force effect of pore wall this moment, and for the pore wall keeps motionless, even make eccentric reaming cover 8 rotate towards the predetermined direction for eccentric neck pole portion, until entering into eccentric state, and rotate this moment the locking make eccentric reaming cover 8 with eccentric neck pole portion 10 keeps relatively fixed to through rotating the locking, transmit drive torque to eccentric reaming cover 8, and then drive eccentric reaming cover 8 and rotate, in order to realize the reaming operation. When the drill bit rotates towards the preset direction, under the action of the friction force of the pore canal wall, the eccentric reaming sleeve 8 reversely rotates to the retraction state, and the eccentric reaming sleeve 8 is stopped in the retraction state through the rotation locking. Wherein the rotation locking is generally including protruding and the arc recess of mutually supporting, and the arch slides in the arc recess to block spacingly by the both ends cell wall of arc recess, if be provided with radial arch on eccentric reaming cover 8, and eccentric neck pole portion 10 is provided with the arc recess, when eccentric reaming cover rotates relative eccentric neck pole portion, radial arch slides in the arc recess.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. An eccentric drilling tool comprises a drill bit, an eccentric reaming sleeve and a rod stabilizer, wherein the front part of the drill bit is a head part, the rear part of the drill bit is a connecting rod part, the middle part of the drill bit is an eccentric neck rod part, the eccentric hole of the eccentric reaming sleeve is sleeved on the eccentric neck rod part and is in running fit with the eccentric neck rod part, the front part of the rod stabilizer is provided with a connecting hole sleeved on the outer side of the connecting rod part, the connecting hole is connected with the connecting rod part through a thread, an axial through hole which is communicated with the front and the back is arranged in the rod stabilizer, a blind hole which is aligned with and communicated with the axial through hole is arranged at the rear side in the drill bit, a shunt hole extending to the drill face of the head part is arranged at the bottom of the blind hole, the connecting rod is characterized in that a radially extending flow guide channel is arranged at the rear part of the connecting rod part, the inner end of the flow guide channel is communicated with the axial through hole cavity or the blind hole cavity, and the outer end of the flow guide channel extends to a gap between the outer side wall of the rear part of the connecting rod part and the wall of the rear hole of the connecting hole.
2. The eccentric drilling tool according to claim 1, wherein a groove body is formed in the end face of the rear portion of the connecting rod portion, and a groove cavity of the groove body is the flow guide channel.
3. The eccentric drilling tool according to claim 2, wherein the slot body is arranged to avoid a force bearing area on the outer side of the rear part of the connecting rod part, which is far away from the eccentric side of the eccentric neck rod part.
4. The eccentric drilling tool according to claim 2, wherein the end of the connection rod is provided with three evenly distributed grooves, one of which extends to the eccentric side of the eccentric neck rod along the eccentric direction.
5. The eccentric drilling tool according to any one of claims 2 to 4, wherein the connection rod part comprises a threaded column section with a connection thread at the periphery, a threaded hole section in threaded connection with the threaded column section is arranged in the connection hole, a positioning column section is arranged at the rear side of the threaded column section of the connection rod part, a positioning column section matched with the positioning column section is arranged at the rear side of the threaded hole section of the connection hole, a drainage groove is arranged at the outer side of the positioning column section, one end of the drainage groove is connected with the groove body, and the other end of the drainage groove extends to the threaded column section.
6. The eccentric drilling tool according to claim 5, wherein the connecting hole has a flared section with a continuously tapered bore diameter from front to back between the threaded bore section and the locating bore section, and a smooth transition is formed between the rear of the flared section and the front of the locating bore section.
7. The eccentric drilling tool according to claim 6, wherein the front section of the connecting hole is a cylindrical hole, the front hole edge of the cylindrical hole is in a rounded corner shape, a limiting shoulder is arranged on one side, close to the eccentric center of the eccentric neck rod part, of the front part of the connecting rod part, a rounded corner is arranged between the limiting shoulder and the cylindrical part on the front side of the threaded column section, and the limiting shoulder abuts against the front end face of the rod stabilizer.
8. The eccentric drilling tool according to claim 7, wherein one end of the eccentric reaming sleeve abuts against the head, the other end of the eccentric reaming sleeve abuts against the end of the rod stabilizer, and a rotation lock is provided between the eccentric reaming sleeve and the drill bit to prevent the eccentric reaming sleeve from continuing to rotate when the eccentric reaming sleeve rotates to an eccentric state in a predetermined direction relative to the drill bit and to prevent the eccentric reaming sleeve from continuing to rotate when the eccentric reaming sleeve rotates to a retracted state in a reverse direction in the predetermined direction relative to the drill bit.
9. The eccentric drilling tool according to claim 8, wherein three diverging holes are formed at the bottom of the blind hole and extend to the drilling surface of the head, and drainage grooves which are communicated with the diverging holes and lead to the side edges are correspondingly formed on the drilling surface of the head.
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| CN201911379417.2A CN111058772B (en) | 2019-12-27 | 2019-12-27 | Eccentric drilling tool |
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|---|---|---|---|---|
| CN113027343A (en) * | 2021-04-12 | 2021-06-25 | 西华大学 | Eccentric rotary positioning tool |
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| CN111058772B (en) | 2024-04-26 |
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