CN114893140B - Drill bit direction-adjusting device, using method thereof and directional core drill bit - Google Patents
Drill bit direction-adjusting device, using method thereof and directional core drill bit Download PDFInfo
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- CN114893140B CN114893140B CN202210497390.2A CN202210497390A CN114893140B CN 114893140 B CN114893140 B CN 114893140B CN 202210497390 A CN202210497390 A CN 202210497390A CN 114893140 B CN114893140 B CN 114893140B
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- 238000000034 method Methods 0.000 title abstract description 11
- 230000005540 biological transmission Effects 0.000 claims abstract description 38
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 37
- 239000007788 liquid Substances 0.000 claims abstract description 20
- 238000007789 sealing Methods 0.000 claims description 6
- 238000005553 drilling Methods 0.000 description 36
- 230000008878 coupling Effects 0.000 description 12
- 238000010168 coupling process Methods 0.000 description 12
- 238000005859 coupling reaction Methods 0.000 description 12
- 239000012530 fluid Substances 0.000 description 9
- 239000011435 rock Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000012546 transfer Methods 0.000 description 4
- 239000000243 solution Substances 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 210000003734 kidney Anatomy 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000004323 axial length Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000000463 material Substances 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
- 238000011160 research Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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
- E21B25/00—Apparatus for obtaining or removing undisturbed cores, e.g. core barrels, core extractors
- E21B25/16—Apparatus for obtaining or removing undisturbed cores, e.g. core barrels, core extractors for obtaining oriented cores
-
- 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
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
-
- 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
- E21B7/04—Directional drilling
Abstract
The invention discloses a drill bit steering device which comprises a drill rod, a driving shaft and a shell, wherein the shell drives the drill bit to steer when rotating; the casing is sleeved on the driving shaft and further comprises a locking assembly, and the locking assembly is connected between the drill rod and the casing so as to transmit torque through a transmission pin of the locking assembly; the driving shaft is provided with a water through hole for guiding liquid from the driving shaft to push the driving pin to move so as to be separated from the torque transmission position. The transmission shaft is provided with the water through hole so as to control whether the transmission pin is positioned at the torque transmission position or not through liquid introduced by the water through hole, and further control whether the locking component is in a locking state or not, so that when the locking component is applied, the liquid conveyed to the drill bit can be utilized to control the locking state of the locking component. Therefore, the bit steering device can effectively solve the problem of inconvenient bit steering. The invention also discloses a directional core drill comprising the drill direction adjusting device and a use method of the drill direction adjusting device.
Description
Technical Field
The invention relates to the technical field of geological exploration, in particular to a drill bit steering device, a directional core drill comprising the drill bit steering device and a using method of the drill bit steering device.
Background
The directional core drilling tool can realize directional drilling according to a preset track, and simultaneously continuously acquire core samples, and can be used in the field of advanced geological exploration. The application of the directional core drilling tool can reduce the tunnel construction risk, find out the surrounding rock and underground water positions in time, and provide effective data support for great engineering decisions such as feasibility research, design and construction of large tunnels such as submarine tunnels.
The existing directional coring technology mainly adopts a screw drill to carry out directional drilling, does not carry out coring, and adopts a conventional coring drill to carry out coring drilling after reaching a designed coring position.
For example, chinese patent publication No. CN113279716a discloses a directional continuous reverse circulation coring combined drilling tool and method, comprising a coring bit, a coring guiding device, a buried double-wall drill rod, a buried double-wall water feeder and a computer which are connected in sequence. The coring guiding device comprises a central tube, an outer tube, a sleeve, an inclinometer element and a guiding mechanism, wherein the computer is communicated with the wire buried by the wire buried double-wall water feeder, the wire buried double-wall drill rod and the coring guiding device, the wire is connected with the inclinometer element, and the inclinometer element is connected with the guiding mechanism. The computer sends a control command, the inclinometer element measures and returns drilling track parameters, the pushing leg arranged on the guide mechanism pushes against the hole wall with different pushing forces according to the command, directional drilling is achieved, meanwhile, the core drill bit drills core, the core returns out of the hole along the central channel under the action of hydraulic force, and accordingly continuous directional core drilling is achieved. But the push leg control system of the drilling tool is complex in design and not suitable for softer floors.
For example, chinese patent publication No. CN112377131A discloses a near-horizontal directional continuous coring device and method, comprising a coring bit, an eccentric guide head connected with the coring bit, an orifice sealing element and a water closet connected with the coring bit; the method comprises the steps of firstly constructing directional drilling holes along a designed coring track in a rock mass to be cored by adopting a directional drilling technology, then providing all drilling tools, putting in a continuous coring device, installing an orifice sealing element, enabling a guide head to slide along the constructed directional drilling holes under the feeding and rotation actions of the drilling machine, and guiding the core drilling tools below to drill and core. But the directional drilling and coring operations of the device cannot be performed simultaneously, and the coring efficiency is low.
A screw core drill is disclosed in chinese patent publication No. CN112282636a, comprising: the outer tube assembly and be used for the suit to be in the outer tube assembly with the inner tube assembly of outer tube assembly joint, outer tube assembly first end is used for being connected with the drilling rod, the second end is equipped with the drill bit subassembly of rotatable coupling with outer tube assembly, the inner tube assembly includes screw motor subassembly, be connected with screw motor subassembly first end and be used for with the salvaging subassembly of outer tube assembly joint and be connected with screw motor subassembly second end sampling assembly, sampling assembly wears inside the drill bit subassembly, screw motor subassembly and drill bit subassembly transmission are connected, in order to drive the drill bit subassembly rotation. The drilling speed of the screw core drill is higher, and the drilling efficiency is higher. But the drilling tool has no directional drilling function.
The existing drilling tools have limited coring length, uncontrollable coring drilling tracks and limited acquired geological information, mainly because the direction of the drill bit is inconvenient to adjust.
In summary, how to effectively solve the problem of inconvenient steering of the drill bit is a problem that needs to be solved by those skilled in the art at present.
Disclosure of Invention
In view of the above, a first object of the present invention is to provide a bit steering device that can effectively solve the problem of inconvenient bit steering, and a second object of the present invention is to provide a directional core drill including the bit steering device, and a third object of the present invention is to provide a method for using the bit steering device.
In order to achieve the first object, the present invention provides the following technical solutions:
a drill bit steering device comprises a drill rod, a driving shaft and a shell which drives a drill bit to steer when rotating; the casing is sleeved on the driving shaft, and further comprises a locking assembly, wherein the locking assembly is connected between the drill rod and the casing so as to transmit torque through a transmission pin of the locking assembly; the driving shaft is provided with a water through hole for guiding liquid from the driving shaft to push the driving pin to move so as to be separated from the torque transmission position.
In the drill bit steering device, when the device is applied to a directional core drill bit, water is injected into a drill rod firstly during directional drilling: most of the water flows to the end face of the drill bit through the driving shaft, and then carries rock scraps along the hole wall to return outside the hole; a small part of water can flow in from the water through hole on the driving shaft, and the transmission pin is separated from the torque transmission position under the action of water pressure. And the drill rod is rotated again, and the shell is in a non-rotating state, so that the drilling direction is unchanged. The rotation of the drill rod drives the driving shaft to rotate together, and the driving shaft drives the drill bit to rotate together to cut rock. When the direction is required to be adjusted, water injection is stopped firstly, at the moment, the transmission pin enters the torque transmission device, at the moment, the drill rod is slowly rotated, the shell slowly rotates together, so that the deflection direction of the drill bit is changed accordingly, and the direction adjustment is completed. When the deflection direction of the drill bit is adjusted to the desired direction, the rotation of the drill rod is stopped. At this point water is refilled, the drive pin is disengaged from the torque transmitting position, the drill pipe is rotated, and directional core drilling can be restarted. In the drill bit steering device, the water through hole is arranged at the transmission shaft, so that whether the transmission pin is positioned at the torque transmission position or not can be controlled through liquid introduced through the water through hole, and further, whether the locking assembly is in a locking state or not is controlled, and when the drill bit steering device is applied, the liquid conveyed to the drill bit can be utilized to control the locking state of the locking assembly. And generally, the drill bit does not need to be turned when liquid is conveyed; when the direction of the drill bit is adjusted, no drilling is generally performed any more; and thus just fits the operating characteristics of the drill bit. In summary, the drill steering device can effectively solve the problem of inconvenient steering of the drill.
Preferably, return spring means are also included for preventing the drive pin from being moved out of the torque transmitting position.
Preferably, the locking assembly comprises a piston capable of moving axially, the transmission pin is fixedly arranged on the piston, a pushing cavity communicated with the water through hole is arranged on one side of the piston, and the reset elastic device for pushing the piston is arranged on the other side of the piston.
Preferably, the locking assembly comprises a coupler fixedly connected with the drill rod, the transmission pin and the coupler are directly or indirectly connected in a sliding mode along the axial direction, and a U-shaped groove matched with the transmission pin is formed in the shell.
Preferably, the device further comprises an intermediate housing, wherein the intermediate housing comprises a rear connecting cylinder part and a front connecting cylinder part; the rear connecting cylinder part is sleeved on the coupler, the piston is arranged between the rear connecting cylinder part and the driving shaft, the inner diameter of the piston is equal to the outer diameter of the driving shaft, and the outer diameter of the piston is equal to the inner diameter of the rear connecting cylinder part; the inner diameter of the front connecting cylinder part is equal to the outer diameter of the driving shaft; the pushing cavity is formed between the front connecting cylinder part and the piston.
Preferably, the inner side surface of the front end of the coupler is in threaded connection with the driving shaft, and the outer side surface of the front end of the coupler is in threaded connection with the rear connecting cylinder.
Preferably, a kidney-shaped groove matched with the transmission pin is arranged on the rear connecting cylinder part.
Preferably, the eccentric device comprises a biasing assembly, wherein an inner hole of an inner eccentric ring of the biasing assembly is matched with the driving shaft, and the outer side of an outer eccentric ring is fixedly connected with the shell; a centralizer is sleeved outside the shell; an upper bearing and a lower bearing are arranged between the shell and the driving shaft; at the front end, there is a sealing means between the housing and the drive shaft.
In order to achieve the second object, the present invention also provides a directional core drill, which includes any one of the above-mentioned bit direction adjusting devices, and further includes a bit mounted to a front end of the driving shaft. Because the drill bit steering device has the technical effects, the directional core drill with the drill bit steering device has the corresponding technical effects.
Preferably, the device further comprises a corer penetrating inside the driving shaft.
In order to achieve the second object, the invention also provides a use method of any one of the drill bit steering devices, which comprises the following steps: stopping the supply of the high-pressure liquid to the drive shaft; driving the drill rod to rotate so as to drive the shell to rotate until the deflection direction of the drill bit meets the set requirement; high pressure fluid is supplied to the drive shaft such that a portion of the fluid flows toward the end face of the drill bit and a portion of the fluid flows through the water passage opening to urge the drive pin out of the torque transmitting position. Because the drill bit steering device has the technical effects, the application method applied to the drill bit steering device also has corresponding technical effects.
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 axial sectional view of a direction-adjusting device of a drill bit according to an embodiment of the present invention;
fig. 2 is a schematic view of an outer side structure of a direction-adjusting device of a drill bit according to an embodiment of the present invention;
FIG. 3 is a schematic side view of a biasing assembly according to an embodiment of the present invention;
fig. 4 is a schematic axial sectional view of a directional core drilling tool according to an embodiment of the present invention.
The figures are marked as follows:
drill rod 1, coring device 2, locking assembly 3, drive shaft 4, housing 5, upper bearing 6, centralizer 7, biasing assembly 8, lower bearing 9, sealing device 10, drill bit 11, coupling 301, intermediate housing 302, return spring 303, piston 304, drive pin 305, water port 401, U-shaped groove 501, inner eccentric ring 801, outer eccentric ring 802, kidney groove 3021, first outer surface 3022, second inner surface 3023, second outer surface 3024, first inner surface 3025.
Detailed Description
The embodiment of the invention discloses a drill bit steering device which can effectively solve the problem of inconvenient steering of a drill bit.
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 to fig. 4, fig. 1 is a schematic axial sectional structure of a direction-adjusting device for a drill according to an embodiment of the invention; fig. 2 is a schematic view of an outer side structure of a direction-adjusting device of a drill bit according to an embodiment of the present invention; FIG. 3 is a schematic side view of a biasing assembly according to an embodiment of the present invention; fig. 4 is a schematic axial sectional view of a directional core drilling tool according to an embodiment of the present invention.
In one embodiment, the present embodiment provides a bit steering device that is primarily used with a directional core drill. Specifically, the drill steering device comprises a drill rod 1, a drive shaft 4, a housing 5 and a locking assembly 3.
Wherein drill rod 1 is used to transmit torque and transfer the torque to drive shaft 4, and drive shaft 4 transfers the torque to drill bit 11 for drilling. And wherein the locking assembly 3 is arranged between the drill rod 1 and the housing 5 for optionally transmitting torque. And the casing 5 is rotated to drive the drill bit 11 to adjust the direction. I.e. when steering is required, the locking assembly 3 can be made to transmit the torque of the drill rod 1 to the housing 5, and the housing 5 rotates to drive the drill bit 11 to steer; when steering is not required, the locking assembly 3 can be made to no longer transmit the torque of the drill rod 1 to the housing 5.
Wherein the casing 5 is sleeved on the driving shaft 4, so that when the casing 5 rotates, the driving shaft 4 is driven to bend through an internal eccentric structure or other pushing structures, and the drill bit 11 can be driven to adjust the direction. A specific solution is to provide a biasing assembly 8 between the housing 5 and the drive shaft 4. Specifically, when the casing 5 rotates, how to drive the drill bit 11 to adjust the direction can be specifically set according to the needs.
Wherein the locking assembly 3 is connected between the drill rod 1 and the housing 5 for transmitting torque through a drive pin 305 of the locking assembly 3, wherein the drive pin 305 is movable to be able to enter and leave a torque transmitting position. When the transmission pin 305 enters the torque transmission position, the drill rod 1 rotates at the moment, so that the shell 5 can be driven to rotate, and the direction can be adjusted; when the driving pin 305 is out of the torque transmission position, the drill rod 1 rotates at this time, and the casing 5 cannot be driven to rotate, so that the direction adjustment is not performed. The movement may be axial or radial, so that the driving pin 305 may enter and exit the limiting slot axially or radially, and when entering the limiting slot, torque may be transferred, but when being removed, torque may not be transferred.
The driving shaft 4 is provided with a water through hole 401 for guiding liquid from the driving shaft 4 to push the driving pin 305 to move to be separated from the torque transmission position, wherein the pushing can be direct pushing or indirect pushing. Mainly by introducing high pressure fluid to push the drive pin 305 into movement, when no high pressure fluid is introduced anymore, the drive pin 305 should be able to enter the torque transmitting position. In use, where the high pressure fluid is used primarily for drilling of bit 11, water is fed to bit 11 through drive shaft 4. It should be noted that, when the driving pin 305 enters the torque transmission device, the driving pin may be realized by gravity, and when the driving pin is drilled downwards, the driving pin may also be realized by the reset elastic device 303, wherein the reset elastic device 303 is used for preventing the driving pin 305 from being separated from the torque transmission position, so that under the action of high-pressure liquid, the elastic force of the reset elastic device 303 is overcome, and when the driving pin is no longer acted by the high-pressure liquid, the elastic force of the reset elastic device 303 pushes the driving pin 305 into the torque transmission position. Wherein one or more water through openings 401 may be arranged in the circumferential direction of the drive shaft 4.
In the drill bit steering device, when the device is applied to a directional core drill bit, water is injected into a drill rod firstly during directional drilling: most of the water will flow through the drive shaft 4 to the end face of the drill bit 11 and then carry cuttings along the bore wall back out of the bore; a small portion of the water will flow in from the water port 401 on the drive shaft 4 and under the influence of the water pressure the drive pin 305 will disengage from the torque transmitting position. The drill rod 1 is rotated again and the housing 5 will be in a non-rotating state, thereby ensuring that the drilling direction is unchanged. Rotation of the drill rod 1 drives the drive shaft 4 to rotate together, and the drive shaft 4 drives the drill bit 11 to rotate together to cut rock. When the direction is to be adjusted, water injection is stopped, at this time, the driving pin 305 enters the torque transmission device, at this time, the drill rod 1 is slowly rotated, and the casing 5 is slowly rotated together, so that the deflection direction of the drill bit 11 is changed accordingly, and the direction adjustment is completed. When the deflection direction of the drill bit 11 is adjusted to the desired direction, the rotation of the drill rod 1 is stopped. At this point, water is refilled and the drive pin 305 is disengaged from the torque transmitting position, rotating the drill rod 1 and directional core drilling can begin again. In this drill steering device, a water port is provided at the drive shaft 4, so that it is possible to control whether the drive pin 305 is located at the torque transmission position by the liquid introduced through the water port 401, and thus whether the locking assembly 3 is in the locked state, so that the liquid supplied to the drill 11 by the drive shaft 4 can be used to control the locked state of the locking assembly 3 when applied. And generally, bit 11 does not need to be turned during the delivery of liquid; while bit 11 is turned, it is normally no longer drilled; and thus just fits the operating characteristics of bit 11. In summary, the bit steering device can effectively solve the problem of inconvenient steering of the bit 11.
Further, for driving the driving pin 305 to move, it is preferred here that the locking assembly 3 further comprises a piston 304 capable of axial movement, wherein the driving pin 305 is fixedly mounted on the piston 304. Wherein the piston 304 may be axially slidably engaged with the drive shaft 4 or other components, such as the intermediate housing 302 described below.
Wherein one side of the piston 304 is provided with a pushing cavity communicated with the water through hole 401, and the other side is provided with a reset elastic device 303 for pushing the piston 304. When high-pressure liquid exists in the driving shaft 4, the high-pressure liquid is led into the pushing cavity through the water through hole 401, and the high-pressure liquid pushes the piston 304 to axially move so as to drive the transmission pin 305 arranged on the piston to be separated from the torque transmission position, and the elastic force of the reset elastic device 303 is overcome. When the high-pressure liquid does not exist in the driving shaft 4, the elastic force of the reset elastic device 303 can push the piston 304 to move reversely along the axial direction, so as to drive the transmission pin 305 mounted on the piston 304 to enter the torque transmission position for reset.
In particular, for ease of installation, it is preferred that the locking assembly 3 further comprises a coupling 301 fixedly connected to the drill rod 1, and the driving pin 305 is directly or indirectly slidably connected to the coupling 301 in the axial direction, so as to limit the movement of the driving pin 305 in the axial direction. The housing 5 is provided with a U-shaped groove 501 which is matched with the driving pin 305, so that when the piston 304 moves axially, the driving pin 305 can be driven to enter and exit the U-shaped groove 501, and when the driving pin 305 enters the U-shaped groove 501, the driving pin 305 can transfer torque with the groove walls on both sides of the U-shaped groove 501, namely, the driving pin 305 enters a torque transfer position; when the driving pin 305 is disengaged from the U-shaped groove 501, no torque is transmitted between the driving pin 305 and the U-shaped groove 501, i.e. the driving pin 305 is disengaged from the torque transmitting means. It should be noted that the above-mentioned mounting manner may be changed, for example, the coupling 301 may be fixedly connected to the housing 5, and the U-shaped groove 501 may be provided on the drill rod 1.
Further, for ease of installation of the piston 304, it is preferred herein to also include an intermediate housing 302, and wherein the intermediate housing 302 includes a rear connecting barrel portion and a front connecting barrel portion; the rear connecting cylinder is sleeved on the coupling 301, and a piston 304 is disposed between the rear connecting cylinder and the driving shaft 4, wherein the inner diameter of the piston 304 is equal to the outer diameter of the driving shaft 4, the outer diameter of the piston is equal to the inner diameter of the rear connecting cylinder, that is, the inner side of the piston 304 is matched with the outer side of the driving shaft 4, and the outer side of the piston 304 is matched with the inner side of the rear connecting cylinder. Wherein the inner diameter of the front connecting cylinder part is equal to the outer diameter of the driving shaft 4, namely the inner side of the front connecting cylinder part is matched with the outer side of the driving shaft 4, and the clearance fit is preferred; so that the push cavity is formed between the front connecting cylinder portion and the piston 304. And a return elastic device 303 is arranged in the cavity between the piston 304 and the coupling 301, wherein the return elastic device 303 is a compression spring, a compression elastomer or the like.
In particular, it is preferred that the first inner surface 3025 of the intermediate housing 302 is in clearance fit with the outer surface of the drive shaft 4, and that the second inner surface 3023 and the outer surface of the drive shaft 4 together form an annular space for mounting the return spring means 303 and the piston 304. The first outer surface 3022 of the intermediate housing 302 has the same outer diameter as the outer surface of the coupling 301. The second outer surface 3024 of the intermediate housing 302 is in clearance fit with the inner surface of the outer housing 5.
In particular, the piston 304 is preferably hollow, with an inner surface that is in clearance fit with the outer surface of the drive shaft 4, and an outer surface that is in clearance fit with the second inner surface 3023 of the intermediate housing 302, and is axially movable within a certain range.
The coupling 301 may be fixedly connected with the driving shaft 4 and the rear connecting cylinder, specifically, the inner side surface of the front end may be in threaded connection with the driving shaft 4, the outer side surface may be in threaded connection with the rear connecting cylinder, that is, the front end of the coupling 301 is sleeved on the driving shaft 4, the two are in threaded connection, and the rear connecting cylinder is sleeved on the front end of the coupling 301, and the two are in threaded connection. Of course, the fixing connection can also be performed by adopting the modes of screws, welding and the like.
As described above, wherein the drive pin 305 may be indirectly slidably coupled to the coupling 301 via the intermediate housing 302. Specifically, a kidney slot 3021 may be provided on the rear connecting cylinder portion to match the driving pin 305. It should be noted that, when the driving pin 305 moves in the axial direction, the piston 304 should be ensured to have a sufficient axial length, so that the piston 304 can block the kidney-shaped groove 3021 to avoid the kidney-shaped groove 3021 from communicating with the pushing cavity, no matter when the driving pin moves to any position.
Further, as described above, for convenience in steering, a biasing assembly 8 may be disposed between the housing 5 and the driving shaft 4, and specifically, an inner hole of an inner eccentric ring 801 of the biasing assembly 8 may be engaged with the driving shaft 4, and an outer side of an outer eccentric ring 802 may be fixedly connected with the housing 5. Specifically, the inner eccentric ring 801 is in clearance fit with the driving shaft 4, and has sliding friction with the driving shaft 4 during normal drilling, so that the inner eccentric ring 801 is made of a material with low hardness such as copper. The outer eccentric ring 802 is clearance fitted with the housing 5, and the biasing assembly 8 is connected with the housing 5 by means of screws, pins or splines or the like, in a rotated state or in a non-rotated state together with the housing 5. The eccentric amount of the biasing assembly 8 can be adjusted within a certain range by rotating the inner eccentric ring 801 and the outer eccentric ring 802. When the inner and outer eccentric rings 801 and 802 are rotated to the positions shown in fig. 2, they are in a maximum eccentric amount state. The outer eccentric ring 802 coincides with the inner eccentric ring 801 in eccentricity, and thus the minimum eccentricity is 0.
Correspondingly, a centralizer 7 can be sleeved outside the shell 5. And wherein the housing 5 and the drive shaft 4 have an upper bearing 6, a lower bearing 9 between them so that a relative rotation can take place. At the front end, there is a sealing means 10 between the housing 5 and the drive shaft 4.
Based on the drill bit steering device provided in the above embodiment, the invention also provides a directional core drill, which comprises any one of the drill bit steering devices in the above embodiment, and further comprises a drill bit, wherein the drill bit is mounted at the front end of the driving shaft. Since the directional core drill adopts the drill bit steering device in the above embodiment, the directional core drill has the beneficial effects described in the above embodiment.
Further, the device also comprises a corer 2 penetrating through the driving shaft 4.
Based on the drill bit steering device provided in the above embodiment, the invention also provides a use method of any one of the drill bit steering devices in the above embodiment, including the following steps: stopping the supply of the high-pressure liquid to the drive shaft 4; driving the drill rod 1 to rotate so as to drive the shell 5 to rotate until the deflection direction of the drill bit 11 meets the set requirement; high pressure fluid is supplied to the drive shaft 4 so that a portion of the fluid flows toward the end face of the drill bit 11 and a portion of the fluid flows in through the water passage 401 to push the drive pin 305 out of the torque transmitting position.
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. A drill bit steering device comprises a drill rod (1), a driving shaft (4) and a shell (5) which drives a drill bit to steer when rotating; the casing (5) is sleeved on the driving shaft (4) and is characterized by further comprising a locking assembly (3), wherein the locking assembly (3) is connected between the drill rod (1) and the casing (5) so as to transmit torque through a transmission pin (305) of the locking assembly (3); the driving shaft (4) is provided with a water through hole (401) for guiding liquid from the driving shaft (4) to push the transmission pin (305) to move so as to be separated from a torque transmission position; -return elastic means (303) for preventing said driving pin (305) from coming out of said torque transmitting position; the locking assembly (3) comprises a piston (304) capable of axially moving, the transmission pin (305) is fixedly arranged on the piston (304), one side of the piston (304) is provided with a pushing cavity communicated with the water through hole (401), and the other side of the piston (304) is provided with a reset elastic device (303) for pushing the piston (304); the locking assembly (3) comprises a coupler (301) fixedly connected with the drill rod (1), the transmission pin (305) is directly or indirectly connected with the coupler (301) in a sliding manner along the axial direction, and the shell (5) is provided with a U-shaped groove (501) matched with the transmission pin (305); also included is an intermediate housing (302), the intermediate housing (302) comprising a rear connecting barrel portion and a front connecting barrel portion; the rear connecting cylinder part is sleeved on the coupler (301), a piston (304) is arranged between the rear connecting cylinder part and the driving shaft (4), the inner diameter of the piston (304) is equal to the outer diameter of the driving shaft (4), and the outer diameter of the piston is equal to the inner diameter of the rear connecting cylinder part; the inner diameter of the front connecting cylinder part is equal to the outer diameter of the driving shaft (4); the pushing cavity is formed between the front connecting cylinder part and the piston (304); the inner side surface of the front end of the coupler (301) is in threaded connection with the driving shaft (4), and the outer side surface of the coupler is in threaded connection with the rear connecting cylinder part.
2. The bit steering device according to claim 1, characterized in that the rear connecting barrel portion is provided with a kidney-shaped groove (3021) cooperating with the drive pin (305).
3. The bit steering device according to any one of claims 1-2, comprising a biasing assembly (8), wherein an inner bore of an inner eccentric ring (801) of the biasing assembly (8) is mated with the drive shaft (4), and an outer side of an outer eccentric ring (802) is fixedly connected with the housing (5); a centralizer (7) is sleeved outside the shell (5); an upper bearing (6) and a lower bearing (9) are arranged between the shell (5) and the driving shaft (4); at the front end, a sealing means is provided between the housing (5) and the drive shaft (4).
4. A directional core drill comprising a drill bit, further comprising a bit steering device according to any one of claims 1 to 3, the drill bit being mounted at the forward end of a drive shaft (4) of the bit steering device.
5. A directional core drill according to claim 4, further comprising a coring device (2) disposed through the interior of the drive shaft (4).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210497390.2A CN114893140B (en) | 2022-05-09 | 2022-05-09 | Drill bit direction-adjusting device, using method thereof and directional core drill bit |
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| CN202210497390.2A CN114893140B (en) | 2022-05-09 | 2022-05-09 | Drill bit direction-adjusting device, using method thereof and directional core drill bit |
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