CN111058772B - Eccentric drilling tool - Google Patents
Eccentric drilling tool Download PDFInfo
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- CN111058772B CN111058772B CN201911379417.2A CN201911379417A CN111058772B CN 111058772 B CN111058772 B CN 111058772B CN 201911379417 A CN201911379417 A CN 201911379417A CN 111058772 B CN111058772 B CN 111058772B
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- eccentric
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- connecting rod
- drill bit
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- 238000005553 drilling Methods 0.000 title claims abstract description 47
- 239000003381 stabilizer Substances 0.000 claims abstract description 27
- 230000000149 penetrating effect Effects 0.000 claims abstract 2
- 230000002441 reversible effect Effects 0.000 claims description 3
- 230000007704 transition Effects 0.000 claims description 3
- 239000000112 cooling gas Substances 0.000 abstract description 10
- 238000000034 method Methods 0.000 description 8
- 239000007789 gas Substances 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- 238000001125 extrusion Methods 0.000 description 4
- 239000011435 rock Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 210000005056 cell body Anatomy 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000003754 machining Methods 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
- 238000009527 percussion Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- 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 OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- Earth Drilling (AREA)
- Processing Of Stones Or Stones Resemblance Materials (AREA)
Abstract
The invention discloses an eccentric drilling tool, which comprises a drill bit, an eccentric reaming sleeve, a stabilizer and an eccentric neck rod part, wherein the middle part of the stabilizer is the 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 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 penetrating through the inside of the stabilizer in front and back is arranged, the rear side of the inside of 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 the drilling surface of the head part, the rear part of the connecting rod part is provided with a diversion channel which extends radially, the inner end of the diversion channel is communicated with the axial through hole cavity or the blind hole, and the outer end extends to a gap between the outer side wall of the rear part of the connecting rod part and the rear part of the connecting hole. The cooling gas of the diversion channel is led out to the threaded connection part to cool the threaded part, so that the problem that the temperature is higher at the position is solved.
Description
Technical Field
The invention relates to the technical field of tools and instruments, in particular to an eccentric drilling tool.
Background
The impact drill bit is widely applied to early rock sample detection of a series of engineering projects such as ore detection, underground rock sample collection, construction engineering, hydropower, ports, high-speed engineering projects, city construction projects and the like, and meanwhile dust is collected, so that environmental pollution is avoided, and the impact drill bit has a good environment-friendly effect. The drill bit consists of a drill bit body and alloy teeth, wherein the drill bit transmits the impact stress wave transmitted by the impactor or the power head to the alloy teeth through the drill bit body, and the alloy teeth break the rock to break the rock.
There is an eccentric drilling tool in the percussion bit, the eccentric drilling tool mainly includes a bit, an eccentric reaming sleeve and a stabilizer connected with the bit, wherein the front section of the bit is a head, the rear section is a connecting rod, the middle is an eccentric neck, the eccentric hole of the eccentric reaming sleeve is sleeved on the eccentric neck and is in running fit, and the mounting hole of the front part of the stabilizer is sleeved on the outer side of the connecting rod and is in threaded connection. The head of the drill bit is mainly used for drilling, the eccentric reaming sleeve is used for further reaming on the basis of drilling of the drill bit, a hole matched with a pipeline is formed, the pipeline is filled in the hole in the drilling process, the diameter of the drill bit is smaller than the inner diameter of the pipeline, the eccentric reaming sleeve can conduct reaming work in an eccentric state, in a retracted state, the eccentric degree can be reduced, namely, the eccentric reaming sleeve is in a state of approaching to the middle, and therefore the eccentric reaming sleeve and the drill bit can be removed from the pipeline cavity.
The rear part of the drill bit is inserted into the stabilizer and is in threaded connection with the stabilizer, and the eccentric drilling tool is easy to blacken and heat at the local stress position of the stabilizer and the eccentric drilling tool in the drilling process, and is difficult to detach.
In summary, how to effectively solve the problem that the stressed position is blackened and heated and is difficult to disassemble is an urgent need for those skilled in the art at present.
Disclosure of Invention
Accordingly, the present invention is directed to an eccentric drilling tool that can effectively solve the problems of blackening and heating at the stress position and difficult disassembly.
In order to achieve the above purpose, the present invention provides the following technical solutions:
The utility model provides an eccentric drilling tool, includes drill bit, eccentric reaming cover and steady pole ware, the drill bit front portion is head, rear portion be connecting rod portion, middle part be eccentric neck portion, eccentric hole cover of eccentric reaming cover is established on the eccentric neck portion and between normal running fit, the front portion of steady pole ware has the cover to be established the connecting hole in the connecting rod portion outside, just the connecting hole with threaded connection between the connecting rod portion, steady pole ware inside is provided with the axial through-hole that link up from front to back, the inside rear side of drill bit be provided with the blind hole that the axial through-hole aligns and set up and communicate, the branch flow hole that extends to the head drilling face has been seted up to the blind hole bottom, connecting rod portion rear portion department is provided with radial extension's water conservancy diversion passageway, water conservancy diversion passageway inner with axial through-hole bore or blind hole intercommunication, the outer end extends to clearance between connecting rod portion rear portion lateral wall and the connecting hole rear portion pore wall.
In this eccentric drilling tool, when using, when leading-in cooling gas in the drill bit in-process forward, when axial through-hole, 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 threaded connection department's clearance, continue to move forward, until out to the connecting hole, in the in-process of flowing through threaded connection department, can play the effect of cooling to threaded connection department. Therefore, in the eccentric drilling tool, the diversion channel is arranged at the rear part of the drill bit so as to lead out the cooling gas flowing inside to the outer side surface of the rear part of the drill bit, and then the cooling gas enters the threaded connection part to cool the threaded part, so that the problem that the temperature is higher due to overlarge load at the rear part of the drill bit and the threaded connection part is greatly reduced. In summary, the eccentric drilling tool can effectively solve the problem that the stressed position is blackened and heated so as to be difficult to disassemble.
Preferably, a groove body is formed in the rear end face of the connecting rod portion, and a groove cavity of the groove body is the diversion channel.
Preferably, the groove body is arranged away from a stress 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 part.
Preferably, the end of the connecting rod part is provided with three evenly distributed groove bodies, wherein one groove body extends to the eccentric side of the eccentric neck part along the eccentric direction.
Preferably, the connecting rod portion includes that the periphery has the screw thread post section of connecting thread, have in the connecting hole with screw thread post section threaded connection's screw hole section, the connecting rod portion is in screw thread post section rear side has the location cylinder section, the connecting hole be in screw hole section rear side have with location cylinder section complex location round hole section, the location cylinder section outside is provided with the drainage groove, the one end of 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 with a continuously tapered aperture from front to back between the threaded hole section and the positioning round hole section, and the rear part of the flared hole section is in smooth transition with the front part of the positioning round hole section.
Preferably, the front section of the connecting hole is a cylindrical hole, the front hole edge of the cylindrical hole is rounded, the front part of the connecting rod part is close to one eccentric side of the eccentric neck part is provided with a limiting shoulder, the limiting shoulder and the cylindrical part at the front side of the threaded column section are rounded, and the limiting shoulder is propped against the front end face of the stabilizer.
Preferably, one end of the eccentric reaming sleeve abuts against the head, the other end abuts against the end of the stabilizer, and a rotation lock is arranged between the eccentric reaming sleeve and the drill bit, so that the eccentric reaming sleeve is prevented from continuing to rotate when the eccentric reaming sleeve rotates to an eccentric state in a preset direction relative to the drill bit, and the eccentric reaming sleeve is prevented from continuing to rotate when the eccentric reaming sleeve rotates to a retracted state in a reverse direction in the preset direction relative to the drill bit.
Preferably, three diversion holes which are distributed in a scattered manner and extend to the drilling surface of the head are formed in the bottom of the blind hole, and the drilling surface of the head is correspondingly provided with diversion grooves which are communicated with the diversion holes and guide the diversion grooves to the side edges.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of a 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 diagram of a head structure of an eccentric drilling tool according to an embodiment of the present invention.
The figures are marked as follows:
Head 1, threaded column section 2, positioning column section 3, column section 4, threaded hole section 5, positioning round hole section 6, column hole 7, eccentric reaming sleeve 8, locking pin 9, eccentric neck 10, blind hole 11, diversion hole 12, groove 13, drainage groove 14, axial through hole 15
Detailed Description
The embodiment of the invention discloses an eccentric drilling tool, which is used for effectively solving the problem that a stressed position is blackened, heated and difficult to disassemble.
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1-3, 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 diagram of a head structure of an eccentric drilling tool according to an embodiment of the present invention.
In one embodiment, the present embodiment provides an eccentric drilling tool, particularly comprising a drill bit, an eccentric reamer sleeve 8 and a stabilizer.
The front part of the drill bit is a head 1, the rear part of the drill bit is a connecting rod part, the middle part of the drill bit is an eccentric neck part 10, the front part of the stabilizer is provided with a connecting hole sleeved outside the connecting rod part, the rear part of the stabilizer is a rod part, the axis of the rod part is generally the rotation axis of the eccentric drilling tool, and the axis of the head 1 and the rotation axis are positioned on the same straight line, so that the head 1 rotates around the axis of the head during the working process.
The eccentric neck portion 10 is a cylindrical rod portion, and the axis of the eccentric neck portion and the axis of rotation are not in the same line, i.e. the axis of the eccentric neck portion is eccentric relative to the axis of rotation. Wherein the eccentric hole cover of eccentric reaming cover 8 is established on eccentric neck portion 10, and normal running fit between, and the hole diameter of eccentric hole equals with the external diameter of eccentric neck portion 10 to make eccentric reaming cover 8 can rotate to eccentric state, and when eccentric state, the moment of torsion transmission of drill bit or steady pole ware is to eccentric reaming cover 8 department, so that eccentric reaming cover 8 can realize reaming operation on the basis of drill bit drilling, and when rotating to the withdrawal state, makes eccentric side no longer protruding the setting, so as to break away from in the pipeline lumen. Specifically, the eccentric reaming sleeve 8 is cylindrical as a whole, and the axis of the outer cylindrical side surface and the axis of the eccentric hole are eccentrically arranged, and preferably, when the eccentric reaming sleeve is turned back to the contracted state, the axis of the outer cylindrical side surface of the eccentric reaming sleeve 8 and the axis of rotation, that is, the straight line where the axis of the drill bit is located, are located on the same straight line.
The connecting hole is in threaded connection with the connecting rod part, the specific connecting rod part comprises a threaded column section 2 with connecting threads on the periphery, a threaded hole section 5 in threaded connection with the threaded column section 2 is correspondingly arranged in the connecting hole, so that threaded connection with the threaded column section 2 is realized through the threaded hole section 5, and the fixed connection is completed. It should be noted that, in order to ensure that the connecting rod portion can be inserted into the connecting hole and that the threaded connection is completed, the portion of the connecting rod portion at the rear side of the threaded post section 2 should be able to pass through the threaded hole section 5.
The stabilizer is internally provided with an axial through hole 15 which penetrates from front to back, wherein the rear side of the inside of the drill bit is provided with a blind hole 11 which is aligned with and communicated with the axial through hole 15, and the bottom of the blind hole 11 is provided with a diversion hole 12 which extends to the drilling surface of the head 1. The rear part of the axial through hole 15 is used for entering gas, and the gas 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 from the diversion hole 12 to the front side of the head 1, namely the front side of the drill bit, so as to play a role of guiding cooling gas. Of course, the dust on the front side of the head 1 can also be blown into the side groove of the eccentric drilling tool through the channel so as to be discharged. The bottom of the blind hole 11 is provided with a plurality of diversion holes 12 which are distributed in a scattered way and extend to the drilling surface of the head 1, and the drilling surface of the head 1 is correspondingly provided with diversion grooves 14 which are communicated with the diversion holes 12 and guide to the side.
The rear part of the connecting rod part is provided with a radially extending flow guide channel, and the flow guide channel can be arranged on the connecting rod part or the stabilizer. Only the diversion channel can meet the condition that the inner end is communicated with the cavity of the axial through hole 15 or the cavity of the blind hole 11, the outer end extends to a gap between the outer side wall of the rear part of the connecting rod part and the wall of the rear part of the connecting hole, so that part of gas led in by the axial through hole 15 can be led out between the outer side wall of the connecting rod part and the wall of the rear part of the connecting hole, and the gas can flow out of the connecting hole forwards from the gap of threaded connection between the two.
In this eccentric drilling tool, when using, in the drilling process in the forward, when leading-in cooling gas in axial through-hole 15, 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 threaded connection department's clearance, continue to move forward, until out to the connecting hole, in the in-process of flowing through threaded connection department, can play the effect of cooling to threaded connection department. Therefore, in the eccentric drilling tool, the diversion channel is arranged at the rear part of the drill bit so as to lead out the cooling gas flowing inside to the outer side surface of the rear part of the drill bit, and then the cooling gas enters the threaded connection part to cool the threaded part, so that the problem that the temperature is higher due to overlarge load at the rear part of the drill bit and the threaded connection part is greatly reduced. In summary, the eccentric drilling tool can effectively solve the problem that the stressed position is blackened and heated so as to be difficult to disassemble.
Further, as described above, the flow guiding channels can be provided in various ways, and only the above requirements need to be met. Considering that the drill bit of the eccentric drilling tool is a high-strength resistant component, the whole machining difficulty is high. The difficulty of processing the hole body in the stabilizer is still great. Based on this, it is preferable that the end face of the connecting rod portion is provided with a groove body 13, and the groove cavity of the groove body 13 is a diversion channel. Namely, during installation, the rear end face of the connecting rod part can prop against the hole bottom of the connecting hole, and as the groove body 13 is arranged at the end face, the notch of the groove body 13 is closed by the hole bottom of the connecting hole, so that the groove cavity forms a diversion channel.
When the eccentric drilling tool is used, the eccentric reaming sleeve 8 with reaming action is stressed on one side only, so that the eccentric side of the corresponding eccentric neck rod part 10 is stressed, a supporting fulcrum is formed at the edge of the eccentric side hole of the connecting hole, the rear side of the connecting rod part is far away from the eccentric side, the part furthest away from the eccentric side can form the support of the rod end, the part furthest away from the eccentric side further forms a stress area, and the stress of the stress area is larger along with the larger side force applied to the head part 1, based on the fact, the groove body 13 is preferably arranged to avoid the stress 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 10, so that the stress area is prevented from being subjected to excessive pressure. It should be noted that, the location away from the stress zone may be offset from the stress zone.
Specifically, it is preferable that the end portion of the connecting rod portion is provided with three evenly distributed groove bodies 13, and one groove body 13 extends to the eccentric side of the eccentric neck portion 10 along the eccentric direction, so that the other two groove bodies 13 are evenly distributed on two sides of the stress area, the three groove bodies 13 are evenly distributed, and included angles between the two groove bodies are 120 degrees, so that the groove bodies 13 are evenly distributed at the end portion of the connecting rod portion, stress concentration is avoided, and stability of the whole structure is ensured.
The connecting hole is in threaded connection with the connecting rod part, the specific connecting rod part comprises a threaded column section 2 with connecting threads on the periphery, a threaded hole section 5 in threaded connection with the threaded column section 2 is correspondingly arranged in the connecting hole, so that threaded connection with the threaded column section 2 is realized through the threaded hole section 5, and the fixed connection is completed. It should be noted that, in order to ensure that the connecting rod portion can be inserted into the connecting hole and that the threaded connection is completed, the portion of the connecting rod portion at the rear side of the threaded post section 2 should be able to pass through the threaded hole section 5.
Further, it is considered that the thread is formed with the above-mentioned stress zone during long-term work, so that the thread is deformed and damaged due to large stress, resulting in a large difficulty in later detachment. In this connection, it is preferred here that the connecting rod portion has a positioning cylinder section 3 on the rear side of the threaded cylinder section 2, the positioning cylinder section 3 and the threaded cylinder section 2 being continuously joined, or other structures being provided therebetween. Wherein the connecting hole is provided with a positioning round hole section 6 matched with the positioning cylindrical section 3 at the rear side of the threaded hole section 5 so as to play a role in positioning the axis after the threaded connection of the threaded cylindrical section 2 and the threaded hole section 5 is completed, wherein the positioning cylindrical section 3 is inserted into the positioning round hole section 6, and the positioning round hole section and the threaded hole section are tightly matched. Wherein, the positioning cylindrical section 3 and the positioning round hole section 6 can be in clearance fit, and the smaller the clearance error is, the better the clearance error is.
During operation, one side of the eccentric reaming sleeve 8 is stressed, and according to the mechanics principle, namely the lever theory, the connecting hole is stressed along the side, close to the stress of the eccentric reaming sleeve 8, of the connecting hole, namely the eccentric side, and is stressed by the fulcrum force, and the extrusion force is arranged between one side, far away from the stress of the eccentric reaming sleeve 8, of the rear end part of the connecting rod part and the connecting hole wall, and because the connecting rod part is provided with the positioning cylindrical section 3 at the rear side of the threaded column section 2, the positioning cylindrical section 3 and the positioning round hole section 6 are subjected to larger extrusion force at the moment, and the extrusion force between the threaded column section 2 and the threaded hole section 5 is reduced
As mentioned above, in order to better introduce the guide channel at the end face of the connecting rod portion into the threaded connection, it is preferred here that the outside of the positioning cylinder section 3 is provided with a guide groove 14, wherein one end of the guide groove 14 engages with the groove body 13 and the other end extends to the threaded cylinder section 2. When a plurality of the groove bodies 13 are provided, the drainage grooves 14 are arranged in one-to-one correspondence with the groove bodies 13, wherein for the convenience of fluid flow, the cross-sectional size shape of the drainage grooves 14 is preferably consistent with the cross-sectional size shape of the groove bodies 13, and are preferably semicircular. I.e. semicircular grooves are formed in the end face and the side face of the positioning cylindrical section 3.
Further, consider that the threaded post section 2 screws into the threaded hole section 5 such that the positioning cylinder section 3 passes through the threaded hole section 5 before entering into the positioning round hole section 6. Because the locating circular hole section 6 is tightly matched with the locating circular hole section 3, and a gap is formed between the threaded column section 2 and the threaded hole section 5, the axes of the threaded column section 2 and the threaded hole section 5 are easy to deviate, and then the locating circular hole section 3 is difficult to accurately enter the locating circular hole section 6, so that the installation is difficult. Based on this, it is preferable here that the connecting hole has a flare section with a continuously tapered aperture from front to back between the screw hole section 5 and the positioning round hole section 6, and a smooth transition is made between the flare section rear portion and the positioning round hole section 6 front portion so that the flare section plays a guiding role. So that in the precession process, wherein the positioning cylinder section 3 enters into the horn aperture section first, is guided by the horn aperture section to ensure centering, then gradually enters into the positioning cylinder section 3, so that the installation is convenient and simple.
Further, in order to sufficiently position the drill bit and the stabilizer, it is preferable that the connecting hole is formed into a cylindrical hole 7 at the front side of the threaded hole section 5, and the connecting rod is formed into a cylindrical portion 4 to be fitted into the cylindrical hole 7 at the front side of the threaded cylindrical section 2, wherein the cylindrical hole 7 and the cylindrical portion 4 are preferably clearance-fitted, and the fitting accuracy is preferably equal to the fitting accuracy between the positioning cylindrical section 3 and the positioning circular hole section 6. For better fixation of the drill bit and the stabilizer, it is preferred here that a locking pin 9 is arranged between the cylindrical bore 7 and the cylindrical portion 4, half of the locking pin 9 being located in a recess in which the bore wall of the cylindrical bore 7 fits, and the other half being located in a recess in which the outer side of the cylindrical portion 4 fits. Wherein the locking pin 9 is generally circular in cross section, and the cylindrical hole 7 and the corresponding groove in the cylindrical portion 4 are both semicircular.
Further, the front section of the preferred connecting hole is a cylindrical hole 7, and the front hole edge of the cylindrical hole 7 is rounded, so that the supporting strength can be effectively ensured by adopting the rounded shape because the front hole edge of the cylindrical hole 7 plays a role of a fulcrum. Also, in order to secure the strength of the drill bit, it is preferable here that the front portion of the connecting rod portion has a limit shoulder on the eccentric side of the eccentric neck portion, wherein a rounded corner is provided between the limit shoulder and the cylindrical portion 4, so as to effectively avoid breakage from occurring easily here. And the limiting shoulder is propped against the front end face of the rod stabilizer, so that a part of extrusion force can be born between the limiting shoulder and the rod stabilizer, and the overlarge pressure at the rear part of the connecting rod is avoided.
Wherein the eccentric neck portion 10 is located between the head portion 1 and the connecting rod portion, and both ends respectively link up with head portion 1 and connecting rod portion, wherein the rear end face of eccentric neck portion 10 forms above-mentioned spacing shoulder, in order to guarantee overall structure's intensity, preferably wherein one end of eccentric reaming cover 8 offsets with head portion 1, and the other end offsets with the tip of steady pole ware.
Wherein the eccentric reamer sleeve 8 rotates on the eccentric neck portion 10 to switch between an eccentric state and a retracted state, wherein the driving of the rotation of the eccentric reamer sleeve 8 relative to the eccentric neck portion 10 can be achieved by an external mechanism driving, but such driving means may result in a relatively complex overall structure, on the basis of which it is preferable that a rotation lock is provided between the eccentric reamer sleeve 8 and the drill bit to prevent the eccentric reamer sleeve 8 from continuing to rotate when the eccentric reamer sleeve 8 rotates to the eccentric state in a predetermined direction relative to the drill bit and to prevent the eccentric reamer sleeve 8 from continuing to rotate when the eccentric reamer sleeve 8 rotates to the retracted state in a reverse direction relative to the drill bit. When the eccentric reaming sleeve 8 rotates to a retracted state relative to the eccentric neck part 10, the stabilizer drives the drill bit to reversely rotate in a preset direction, and the eccentric reaming sleeve 8 is kept motionless relative to the hole wall under the action of friction force of the hole wall, namely the eccentric reaming sleeve 8 rotates in the preset direction relative to the eccentric neck part until the eccentric reaming sleeve enters the eccentric state, and at the moment, the eccentric reaming sleeve 8 and the eccentric neck part 10 are kept relatively fixed by rotation locking, so that driving torque is transmitted to the eccentric reaming sleeve 8 through rotation locking, and the eccentric reaming sleeve 8 is driven to rotate, so that reaming operation is realized. When the drill bit rotates in a preset direction, under the action of friction force of the hole channel wall, the eccentric reaming sleeve 8 reversely rotates to a retracted state, and then the eccentric reaming sleeve 8 stays in the retracted state by rotation locking. The rotation locking generally comprises a protrusion and an arc-shaped groove which are matched with each other, the protrusion slides in the arc-shaped groove and is blocked and limited by groove walls at two ends of the arc-shaped groove, if radial protrusions are arranged on the eccentric reaming sleeve 8, the eccentric neck part 10 is provided with the arc-shaped groove, and when the eccentric reaming sleeve rotates relative to the eccentric neck part, the radial protrusions slide in the arc-shaped groove.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer 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 (5)
1. The eccentric drilling tool comprises a drill bit, an eccentric reaming sleeve and a stabilizer, wherein the front part of the drill bit is a head, the rear part of the drill bit is a connecting rod part, the middle part of the drill bit is an eccentric neck part, an eccentric hole of the eccentric reaming sleeve is sleeved on the eccentric neck part and is in running fit with the eccentric neck part, the front part of the 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 penetrating front and back is arranged in the stabilizer, the rear side of the drill bit is provided with a blind hole aligned with and communicated with the axial through hole, the bottom of the blind hole is provided with a diversion hole extending to the drilling surface of the head, and the eccentric reaming sleeve is characterized in that a diversion channel extending radially is arranged at the rear part of the connecting rod part, the inner end of the diversion channel is communicated with the axial through hole cavity or the blind hole cavity, and the outer end of the diversion channel extends to a gap between the outer side wall of the rear part of the connecting rod part and the connecting hole;
a groove body is formed in the end face of the rear part of the connecting rod part, and a groove cavity of the groove body is the diversion channel;
the groove body is arranged away from a stress 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 part;
the end part of the connecting rod part is provided with three groove bodies which are uniformly distributed, wherein one groove body extends to the eccentric side of the eccentric neck part along the eccentric direction;
the connecting rod part comprises a threaded column section with connecting threads on the periphery, a threaded hole section in threaded connection with the threaded column section is arranged in the connecting hole, a positioning cylindrical section is arranged on the rear side of the threaded column section, a positioning round hole section matched with the positioning cylindrical section is arranged on the rear side of the threaded hole section in the connecting hole, a drainage groove is arranged on the outer side of the positioning cylindrical 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;
The connecting hole is a cylindrical hole at the front side of the threaded hole section, the connecting rod is a cylindrical part matched with the cylindrical hole at the front side of the threaded column section, and a locking pin is arranged between the cylindrical hole and the cylindrical part.
2. The eccentric drilling tool of claim 1, wherein the connection hole has a flared hole section with a continuously tapered bore diameter from front to back between the threaded hole section and the locating round hole section, and wherein a smooth transition is provided between the flared hole section rear portion and the locating round hole section front portion.
3. The eccentric drilling tool of claim 2, wherein the front hole edge of the cylindrical hole is rounded, a side of the front portion of the connecting rod portion, which is close to the eccentricity of the eccentric neck portion, is provided with a limiting shoulder, the limiting shoulder is rounded with the cylindrical portion on the front side of the threaded column section, and the limiting shoulder abuts against the front end face of the stabilizer.
4. The eccentric drilling tool of claim 3, wherein one end of the eccentric reamer sleeve abuts against the head portion and the other end abuts against the end portion of the stabilizer, and a rotation lock is provided between the eccentric reamer sleeve and the drill bit to prevent the eccentric reamer sleeve from continuing to rotate when the eccentric reamer sleeve rotates to an eccentric state in a predetermined direction with respect to the drill bit, and to prevent the eccentric reamer sleeve from continuing to rotate when the eccentric reamer sleeve rotates to a retracted state in a reverse direction in the predetermined direction with respect to the drill bit.
5. The eccentric drilling tool of claim 4, wherein three diversion holes are formed in the bottom of the blind hole in a scattered manner and extend to the drilling surface of the head, and the drilling surface of the head is correspondingly provided with diversion grooves communicated with the diversion holes and led to the side edges.
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| CN201911379417.2A CN111058772B (en) | 2019-12-27 | 2019-12-27 | Eccentric drilling tool |
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| CN201911379417.2A CN111058772B (en) | 2019-12-27 | 2019-12-27 | Eccentric drilling tool |
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| CN111058772B true CN111058772B (en) | 2024-04-26 |
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| CN113027343B (en) * | 2021-04-12 | 2023-09-29 | 定边县泽林石油工程有限公司 | Eccentric rotary positioning tool |
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