CN119900458B - High deflection screw drilling tools - Google Patents
High deflection screw drilling toolsInfo
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- CN119900458B CN119900458B CN202510149204.XA CN202510149204A CN119900458B CN 119900458 B CN119900458 B CN 119900458B CN 202510149204 A CN202510149204 A CN 202510149204A CN 119900458 B CN119900458 B CN 119900458B
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Abstract
The invention relates to a high deflecting screw drilling tool applied to the field of drilling tools, which comprises a bypass valve assembly, wherein the bottom of the bypass valve assembly is connected with a motor assembly, the bottom of the motor assembly is connected with a universal shaft assembly, the adjustment of the working face of a drill bit can be realized by utilizing the cooperation of an outer gear, an inner gear, a middle gear, the drill bit and a diagonal draw bar, the self-adaptive adjustment of the drilling dimension of the drill bit during working can be realized under the cooperation of a wedge-shaped plug connector and a screw rod, the requirements of different drilling dimensions are met, and the synchronous rotation of a driving shell and the drill bit is ensured when the drill bit moves outwards by virtue of the movable connection of the diagonal draw bar and a bar groove, so that the drill bit processed by an adjusting unit can still normally perform drilling.
Description
Technical Field
The invention relates to a screw drilling tool, in particular to a high-deflection screw drilling tool applied to the field of drilling tools.
Background
The screw drilling tool is a volumetric underground power drill which uses drilling fluid as power and converts the fluid pressure energy into mechanical energy, and is mainly formed from several large portions of bypass valve, screw motor (rotor and stator), universal joint, bearing and driving shaft, etc..
The specification of Chinese patent CN118110416A discloses a high-deflecting and high-efficiency screw drilling tool, and the invention has good deflecting and compounding capability, so that the service life of the whole drilling tool at least reaches 2-3 times that of the prior art, in addition, the specification of Chinese patent CN213980634U discloses a Gao Zaoxie screw drilling tool for a medium-radius horizontal well, in the compound drilling process, a middle centralizer can reduce the vibration of the screw drilling tool, so that a well hole is smoother, the full angle change rate of a well hole track can be reduced, the sliding ratio can be greatly reduced in full well section operation, the directional construction time and times in the drilling process are reduced, and the drilling efficiency is improved.
In addition, in the actual underground drilling process, the inner diameter of the well is in a dynamic change state, and the fixed-mounted drill bit is difficult to realize corresponding change of the drilling dimension, so that the practicability of the high-deflection screw drilling tool is limited.
Disclosure of Invention
Aiming at the prior art, the invention aims to solve the technical problem of how to switch the working face of the drill bit when corresponding drilling treatment is carried out so as to avoid continuous working of the worn working face, and simultaneously, the drilling size of the drill bit is adaptively adjusted so as to adapt to changeable drilling requirements.
In order to solve the problems, the invention provides a high deflecting screw drilling tool, which comprises a bypass valve assembly, wherein the bottom of the bypass valve assembly is connected with a motor assembly, the bottom of the motor assembly is connected with a universal shaft assembly, the universal shaft assembly is connected with a transmission shaft assembly, the transmission shaft assembly comprises a driving shell and a transmission shaft body, the tail end of the transmission shaft body extends to the inside of the driving shell, the tail end of the transmission shaft body is connected with the inner wall of the driving shell through a short rod, an inner layer gear is arranged on the bottom wall of the driving shell, a plurality of middle layer gears are connected with the outer side of each middle layer gear in a surrounding and meshed manner, an outer layer gear is connected with the outer side of each middle layer gear in a meshed manner, a plug rod is arranged in the outer layer gear in a penetrating manner, and a drill bit is arranged at the bottom of the plug rod;
The surface that the drive casing is close to the bottom is equipped with a plurality of breach with drill bit one-to-one, and drive casing's internally mounted has the dual drive motor that has two drive ends, and one of them drive end of dual drive motor is connected with inlayer gear, and drive casing's internally mounted has the adjusting unit, and drive casing's surface is equipped with and a plurality of breach one-to-one and is located the bar groove of breach top, and the top of plug-in connection pole is connected with the diagonal draw bar through articulated ball, and the tail end of diagonal draw bar passes through articulated ball and bar groove swing joint.
In the Gao Zaoxie screw drilling tool, the outer gear, the inner gear, the middle gear, the drill bit and the diagonal draw bar are matched, so that the working face of the drill bit can be adjusted, and under the matching of the wedge-shaped plug connector and the screw rod, the self-adaptive adjustment of the drilling size of the drill bit during working can be realized, and the requirements of different drilling sizes are met.
As a further improvement of the application, the adjusting unit comprises a screw rod positioned below the transmission shaft body, the other driving end of the double-driving motor is connected with the screw rod, a movable sleeve is sleeved on the surface thread of the screw rod, a plurality of bridge rods with L-shaped sections are fixedly arranged on the surface of the movable sleeve, and the bottom ends of the bridge rods are connected with wedge-shaped connectors through self-resetting rotating shafts.
As a further improvement of the application, the middle gear comprises a fixed part and a movable part, the arc length of the movable part is smaller than that of the fixed part, two cylindrical grooves and plug holes positioned in the middle of the two cylindrical grooves are arranged on the surface of the fixed part, which is close to the movable part, an extension spring is connected inside the cylindrical grooves, the tail end of the extension spring is connected with the surface of the movable part, and two plug blocks matched with the plug holes are connected on the surface of the movable part.
As a further improvement of the application, the cross section of the wedge-shaped plug connector is right trapezoid, the projection of the bottom end of the wedge-shaped plug connector in the vertical direction is positioned at the gap between the fixed part and the movable part, and the wedge-shaped plug connector is positioned in the middle of the two plug connectors.
As a further improvement of the application, annular grooves are arranged on the top surfaces of the middle gear and the outer gear, bridge pieces with inverted U-shaped cross sections are movably connected in the two annular grooves through hinge balls, a reset spring is connected to the top of each bridge piece, a disc is fixedly connected to the top of each reset spring, a sliding rod with an L-shaped cross section is rotatably connected to the top of each disc, and the sliding rods penetrate through the inside of each bridge rod in a sliding mode.
As a further improvement of the application, in the initial state, a horizontal gap exists on the surface of the double-drive motor at one end of the sliding rod, which is far away from the outer gear, and the section width value of the movable part is larger than the maximum thickness value of the wedge-shaped plug-in connector.
As a further improvement of the application, the transmission shaft assembly further comprises a shell, the bottom of the shell is rotationally connected with the top of the driving shell, and the projection of the drill bit in the vertical direction in the initial state protrudes out of the driving shell and is not smaller than half of the volume of the drill bit.
As a further improvement of the application, the working method comprises the following steps:
S1, when drilling, the transmission shaft body rotates to drive the driving shell to rotate, and the drill bit and the driving shell synchronously rotate under the action of the diagonal draw bar to perform drilling treatment;
S2, after the working face of the drill bit is worn, the working face of the drill bit is driven to be adjusted by utilizing the meshing action of the double-drive motor, the inner gear, the middle gear and the outer gear, and then drilling is continued;
S3, when the drilling size needs to be adjusted, the wedge-shaped plug connector is driven to descend by the lead screw, the movable part is driven to deviate from the inner layer gear to move, the outer layer gear is driven to synchronously move, the diagonal draw bar moves downwards at the moment, and then drilling work is continued;
s4, on the basis of S3, when the working face of the drill bit is required to be adjusted, the middle-layer gear can be driven to rotate, and the meshing effect of the movable part and the outer-layer gear is utilized to drive the adjustment of the working face of the drill bit.
In summary, the outer gear, the inner gear, the middle gear, the drill bit and the diagonal draw bar are utilized to be matched, the adjustment of the working face of the drill bit can be realized, the self-adaptive adjustment of the drilling size of the drill bit during working can be realized under the matching of the wedge-shaped plug connector and the lead screw, the requirements of different drilling sizes are met, and the synchronous rotation of the driving shell and the drill bit is ensured when the drill bit moves outwards by virtue of the movable connection of the diagonal draw bar and the bar groove, so that the drill bit processed by the adjusting unit can still normally perform drilling.
Drawings
FIG. 1 is a schematic view of the overall structure of a first embodiment of the present application;
fig. 2 is a schematic view showing the internal structure of a driving housing according to a first embodiment of the present application;
FIG. 3 is an installation view of an outer gear, an inner gear and an intermediate gear according to a first embodiment of the present application;
FIG. 4 is a schematic view of a bridge and return spring installation of a first embodiment of the present application;
FIG. 5 is a state diagram of the first embodiment of the present application when the working surface of the drill bit is adjusted;
FIG. 6 is a schematic view of the installation of a tension spring and plug block according to a first embodiment of the present application;
FIG. 7 is a schematic view showing the outward movement of the drill bit according to the first embodiment of the present application;
FIG. 8 is a schematic view showing the state of the diagonal draw bar when the drill bit of the first embodiment of the present application is moved outward;
FIG. 9 is a schematic view showing the adjustment of the working surface when the drill bit moves outwards according to the first embodiment of the present application;
fig. 10 is a schematic diagram showing working steps of a second embodiment of the present application.
The reference numerals in the figures illustrate:
1. A bypass valve assembly; 2, a motor assembly, 3, a universal shaft assembly, 4, a transmission shaft assembly, 41, a transmission shaft body, 42, a driving shell, 5, a drill bit, 6, a diagonal draw bar, 7, a double driving motor, 8, an outer gear, 9, a middle gear, 10, an inner gear, 11, a lead screw, 12, a bridge rod, 13, a wedge-shaped plug connector, 14, a reset spring, 15, a bridge connector, 16, a tension spring, 17 and a plug connector.
Detailed Description
Two embodiments of the present application will be described in detail with reference to the accompanying drawings.
First embodiment:
1-3 show a high deflecting screw drilling tool, comprising a bypass valve assembly 1, wherein the bottom of the bypass valve assembly 1 is connected with a motor assembly 2, the bottom of the motor assembly 2 is connected with a universal shaft assembly 3, the universal shaft assembly 3 is connected with a transmission shaft assembly 4, the transmission shaft assembly 4 comprises a driving shell 42 and a transmission shaft body 41, the tail end of the transmission shaft body 41 extends to the inside of the driving shell 42, the tail end of the transmission shaft body 41 is connected with the inner wall of the driving shell 42 through a short rod, the bottom wall of the driving shell 42 is provided with an inner layer gear 10, the outer side of the inner layer gear 10 is connected with a plurality of middle layer gears 9 in a surrounding meshing manner, the outer side of each middle layer gear 9 is connected with an outer layer gear 8 in a meshing manner, a plug rod is installed in the inner part of the outer layer gear 8 in a penetrating manner, and a drill bit 5 is installed at the bottom of the plug rod;
The surface that drive casing 42 is close to the bottom is equipped with a plurality of breach that corresponds with drill bit 5 one-to-one, and drive casing 42's internally mounted has the double drive motor 7 that has two drive ends, and one of them drive end and inlayer gear 10 of double drive motor 7 are connected, and drive casing 42's internally mounted has the adjusting unit, and drive casing 42's surface is equipped with the bar groove with a plurality of breach one-to-one and be located the breach top, and the top of plug-in bar is connected with diagonal draw bar 6 through articulated ball, and the tail end of diagonal draw bar 6 passes through articulated ball and bar groove swing joint.
The transmission shaft assembly 4 further comprises a housing, the bottom of the housing is rotatably connected with the top of the driving housing 42, and the projection of the drill bit 5 in the vertical direction in the initial state protrudes out of the driving housing 42 to be not less than half the volume of the drill bit 5.
Specifically, when the screw drilling tool works, the bypass valve assembly 1, the motor assembly 2, the universal shaft assembly 3 and the transmission shaft assembly 4 are utilized (the working principle of the screw drilling tool is the prior art, and redundant description is omitted here).
When the transmission shaft body 41 rotates, the driving shell 42 is driven to rotate, and as the drill bits 5 are connected with the diagonal draw bars 6 through the inserting connection bars, and the diagonal draw bars 6 are movably connected with the strip-shaped grooves on the surface of the driving shell 42, when the driving shell 42 rotates, the diagonal draw bars 6 can be driven to synchronously rotate, so that the drill bits 5 are driven to synchronously rotate along with the driving shell 42, three drill bits 5 can synchronously move, and drilling treatment is realized.
After the initial working surface of the drill bit 5 is worn, the rest part of the drill bit 5 (i.e. the part of the drill bit 5 in the driving housing 42 in the vertical projection in the initial state) is in a normal use state, and one of the driving ends of the dual driving motors 7 is started to drive the inner gear 10 to rotate, so that the outer gear 8 can be indirectly driven to synchronously rotate under the meshing action (because the inserting rod is movably connected with the diagonal draw bar 6, the diagonal draw bar 6 is not affected when the outer gear 8 rotates), and the drill bit 5 is driven to realize the adjustment of the working surface (as shown in fig. 5).
Fig. 3 shows that the adjusting unit comprises a screw rod 11 positioned below a transmission shaft body 41, the other driving end of the double driving motor 7 is connected with the screw rod 11, a movable sleeve is sleeved on the surface of the screw rod 11 in a threaded manner, a plurality of bridge rods 12 with L-shaped sections are fixedly arranged on the surface of the movable sleeve, and the bottom ends of the bridge rods 12 are connected with wedge-shaped connectors 13 through self-resetting rotating shafts.
The cross section of the wedge-shaped plug connector 13 is right trapezoid, the projection of the bottom end of the wedge-shaped plug connector 13 in the vertical direction is located at the gap between the fixed part and the movable part, and the wedge-shaped plug connector 13 is located in the middle of the two plug connectors 17.
When the working radius (i.e. the size of the well) of the drill bit 5 needs to be switched, the position of the middle gear 9 needs to be adjusted firstly, that is, the gap between the fixed part and the movable part needs to be vertically located below the wedge-shaped plug-in piece 13 (an infrared emitter and an infrared receiver can be respectively arranged on the surfaces of the fixed part and the wedge-shaped plug-in piece 13 to assist adjustment, the alignment means is not limited to one type), then the other driving end of the double-driving motor 7 is started, so that the screw rod 11 rotates, thereby driving the bridge rod 12 to move downwards, and then driving the wedge-shaped plug-in piece 13 to descend, and the fixed part and the movable part can be separated by virtue of the gradually widened wedge-shaped plug-in piece 13, so that the movable part meshed with the outer gear 8 can drive the outer gear 8 to deviate from the double-driving motor 7, thereby indirectly driving the drill bit 5 to move outwards, and the well size during well drilling is enlarged (as shown in fig. 7).
Along with the outward movement of the drill bit 5, the height position of the diagonal draw bar 6 movably connected with the drill bit 5 through the inserting connection rod in the bar-shaped groove is gradually reduced, so that the drill bit 5 can still keep synchronous movement with the driving shell 42 through the movable connection effect of the diagonal draw bar 6 after the outward movement, and corresponding drilling operation can be normally performed (as shown in fig. 8).
Fig. 6 shows that the middle gear 9 comprises a fixed part and a movable part, the arc length of the movable part is smaller than that of the fixed part, two cylindrical grooves and plug holes positioned in the middle of the two cylindrical grooves are formed in the surface of the fixed part, which is close to the movable part, an extension spring 16 is connected to the inner part of each cylindrical groove, the tail end of the extension spring 16 is connected with the surface of the movable part, and two plug blocks 17 matched with the plug holes are connected to the surface of the movable part.
Specifically, when the drill bit 5 moves outwards, the extension spring 16 connected with the movable part stretches along with the extension spring, and when the wedge-shaped plug connector 13 moves upwards along with the resetting, the movable part is driven to reset under the action of the extension spring 16 and the movable part and the fixed part are in plug constraint by virtue of the action of the plug block 17, so that the movable part and the fixed part are integrated.
Fig. 4 shows that the top surfaces of the middle gear 9 and the outer gear 8 are respectively provided with an annular groove, the interiors of the two annular grooves are movably connected with a bridge piece 15 with an inverted U-shaped section through a hinge ball, the top of the bridge piece 15 is connected with a return spring 14, the top of the return spring 14 is fixedly connected with a disc, the top of the disc is rotatably connected with a sliding rod with an L-shaped section, and the sliding rod slides through the interior of the bridge rod 12.
Specifically, when the movable part and the fixed part are combined, the movable part can drive the outer gear 8 to synchronously move when the movable part is reset by virtue of the connecting effect of the bridging part 15, so that the meshing effect is ensured to be stably maintained.
When the wedge-shaped plug connector 13 moves downwards, the return spring 14 is extruded, a movable space exists, and the bridge 15 can be restrained by the sliding rod and the return spring 14 due to the fixed installation angle of the bridge rod 12, so that the end parts of the bridge 15 can respectively move relatively in the two annular grooves but are not influenced by the rotation of the outer layer gear 8 and the middle layer gear 9, and even if the fixed part and the movable part of the middle layer gear 9 are in a separated state, the annular grooves on the surface of the movable part can still be kept connected with the bridge 15.
In the initial state, a horizontal gap exists on the surface of the double-drive motor 7 at one end of the sliding rod, which is far away from the outer gear 8, and the section width value of the movable part is larger than the maximum thickness value of the wedge-shaped plug connector 13.
Specifically, when the fixed portion and the movable portion are separated, the sliding rod moves synchronously through, so that the stability of the bridge 15 is not affected.
When the working face of the drill bit 5 is required to be adjusted in the state that the fixed part and the movable part are separated, the fixed part can be driven to rotate in a small range by utilizing the rotation of the inner gear 10, and at the moment, the fixed part and the movable part are still in an overlapped state even in the maximum separation state due to the difference value between the section width value of the movable part and the thickness of the wedge-shaped plug connector 13, so that the movable part synchronously rotates when the fixed part rotates in a small range, and the drill bit 5 can be driven to adjust the working face in a small range by virtue of the engagement of the movable part and the outer gear 8 (as shown in fig. 9).
In this process, since the wedge-shaped plug 13 is rotationally connected to the bridge 12, the wedge-shaped plug 13 can synchronously complete a corresponding deflection when the drill bit 5 adjusts the working surface, and can be automatically reset under the action of the automatic reset shaft after lifting and resetting.
Second embodiment:
Fig. 10 shows that the working method comprises the following steps:
S1, during drilling, a transmission shaft body 41 rotates to drive a driving shell 42 to rotate, and a drill bit 5 and the driving shell 42 synchronously rotate under the action of a diagonal draw bar 6 to perform drilling treatment;
S2, after the working face of the drill bit 5 is worn, the working face of the drill bit 5 is driven to be adjusted by utilizing the meshing action of the double-drive motor 7, the inner gear 10, the middle gear 9 and the outer gear 8, and then drilling work is continued;
S3, when the drilling size needs to be adjusted, the screw rod 11 is used for driving the wedge-shaped plug connector 13 to descend, the movable part is driven to deviate from the inner layer gear 10 to move, the outer layer gear 8 is driven to synchronously move, the diagonal draw bar 6 moves downwards at the moment, and then drilling work is continued;
s4, on the basis of S3, when the working face of the drill bit 5 is required to be adjusted, the middle-layer gear 9 can be driven to rotate, and the meshing effect of the movable part and the outer-layer gear 8 is utilized to drive the adjustment of the working face of the drill bit 5.
In conclusion, the outer gear 8, the inner gear 10, the middle gear 9, the drill bit 5 and the diagonal draw bar 6 are utilized to be matched, the adjustment of the working surface of the drill bit 5 can be realized, the self-adaptive adjustment of the drilling size of the drill bit 5 during working can be realized under the matching of the wedge-shaped plug connector 13 and the lead screw 11, the different drilling size requirements are met, the synchronous rotation of the driving shell 42 and the drill bit 5 is ensured when the drill bit 5 moves outwards through the movable connection of the diagonal draw bar 6 and the bar-shaped groove, and the drill bit 5 processed by the adjusting unit is ensured to be still capable of normally drilling.
The present application is not limited to the above-described embodiments, which are adopted in connection with the actual demands, and various changes made by the person skilled in the art without departing from the spirit of the present application are still within the scope of the present application.
Claims (6)
1. The high deflecting screw drilling tool comprises a bypass valve assembly (1), wherein the bottom of the bypass valve assembly (1) is connected with a motor assembly (2), the bottom of the motor assembly (2) is connected with a universal shaft assembly (3), the universal shaft assembly (3) is connected with a transmission shaft assembly (4) at the bottom of the universal shaft assembly (3), the high deflecting screw drilling tool is characterized in that the transmission shaft assembly (4) comprises a driving shell (42) and a transmission shaft body (41), the tail end of the transmission shaft body (41) extends to the inside of the driving shell (42), the tail end of the transmission shaft body (41) is connected with the inner wall of the driving shell (42) through a short rod, an inner gear (10) is arranged at the bottom wall of the driving shell (42), a plurality of middle gears (9) are connected with the outer gears (8) in a surrounding and meshed mode at the outer side of each middle gear (9), a plug rod is installed inside the outer gears (8) in a penetrating mode, and a drill bit (5) is installed at the bottom of the plug rod;
The surface of the driving shell (42) close to the bottom end is provided with a plurality of notches which are in one-to-one correspondence with the drill bit (5), a double driving motor (7) with two driving ends is arranged in the driving shell (42), one driving end of the double driving motor (7) is connected with the inner gear (10), an adjusting unit is arranged in the driving shell (42), the surface of the driving shell (42) is provided with strip-shaped grooves which are in one-to-one correspondence with the plurality of notches and are positioned above the notches, the top of the inserting rod is connected with a diagonal draw bar (6) through a hinged ball, and the tail end of the diagonal draw bar (6) is movably connected with the strip-shaped grooves through the hinged ball;
the adjusting unit comprises a screw rod (11) positioned below a transmission shaft body (41), the other driving end of the double driving motor (7) is connected with the screw rod (11), a movable sleeve is sleeved on the surface of the screw rod (11) in a threaded manner, a plurality of bridge rods (12) with L-shaped sections are fixedly arranged on the surface of the movable sleeve, and the bottom ends of the bridge rods (12) are connected with wedge-shaped connectors (13) through self-resetting rotating shafts;
The cross section of the wedge-shaped plug connector (13) is in a right trapezoid shape, the projection of the bottom end of the wedge-shaped plug connector (13) in the vertical direction is positioned at a gap between the fixed part and the movable part, the wedge-shaped plug connector (13) is positioned between the two plug connectors (17), and the middle gear (9) comprises the fixed part and the movable part;
when the working radius of the drill bit (5) needs to be switched, the position of the middle gear (9) needs to be adjusted firstly, namely, a gap between the fixed part and the movable part needs to be vertically positioned below the wedge-shaped plug connector (13), then the other driving end of the double-driving motor (7) is started, the screw rod (11) rotates, the bridge rod (12) is driven to move downwards, the wedge-shaped plug connector (13) is driven to descend, the fixed part and the movable part can be separated by virtue of the gradually widened wedge-shaped plug connector (13), the movable part meshed with the outer gear (8) can drive the outer gear (8) to deviate from the double-driving motor (7) to move outwards, and the size of the drill bit (5) in a well is enlarged.
2. The high deflecting screw drilling tool according to claim 1, wherein the arc length of the movable part is smaller than that of the fixed part, two cylindrical grooves and plug holes positioned in the middle of the two cylindrical grooves are formed in the surface, close to the movable part, of the fixed part, an extension spring (16) is connected to the inside of each cylindrical groove, the tail end of the extension spring (16) is connected with the surface of the movable part, and two plug blocks (17) matched with the plug holes are connected to the surface of the movable part.
3. The high deflecting screw drilling tool according to claim 2, wherein annular grooves are formed in the top surfaces of the middle layer gear (9) and the outer layer gear (8), a bridge piece (15) with an inverted U-shaped cross section is movably connected to the inside of each annular groove through a hinge ball, a return spring (14) is connected to the top of the bridge piece (15), a disc is fixedly connected to the top of the return spring (14), a sliding rod with an L-shaped cross section is rotatably connected to the top of the disc, and the sliding rod penetrates through the inside of the bridge rod (12) in a sliding mode.
4. The high deflecting screw drilling tool according to claim 3, wherein in an initial state, a horizontal gap exists on the surface of the double driving motor (7) at one end of the sliding rod, which is far away from the outer gear (8), and the section width of the movable part is larger than the maximum thickness of the wedge-shaped plug-in connector (13).
5. The high deflecting screw drilling tool according to claim 4, wherein the drive shaft assembly (4) further comprises a housing, the bottom of the housing is rotatably connected to the top of the driving housing (42), and the portion of the drill bit (5) projecting from the driving housing (42) in the vertical direction in the initial state is not smaller than half the volume of the drill bit (5).
6. The high whipstock screw drill of claim 5, wherein the method of operation comprises the steps of:
S1, when drilling, a transmission shaft body (41) rotates to drive a driving shell (42) to rotate, and a drill bit (5) and the driving shell (42) synchronously rotate under the action of a diagonal draw bar (6) to perform drilling treatment;
s2, after the working face of the drill bit (5) is worn, the working face of the drill bit (5) is driven to be adjusted by utilizing the meshing action of the double-drive motor (7), the inner layer gear (10), the middle layer gear (9) and the outer layer gear (8), and then drilling work is continued;
s3, when the drilling size needs to be adjusted, the wedge-shaped plug connector (13) is driven to descend by the lead screw (11), the movable part is driven to deviate from the inner layer gear (10) to move, the outer layer gear (8) is driven to synchronously move, and the diagonal draw bar (6) moves downwards at the moment and then drilling work is continued;
S4, when the working face of the drill bit (5) is required to be adjusted on the basis of S3, the middle-layer gear (9) can be driven to rotate, and the working face of the drill bit (5) is driven to be adjusted by the meshing action of the movable part and the outer-layer gear (8).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202510149204.XA CN119900458B (en) | 2025-02-11 | 2025-02-11 | High deflection screw drilling tools |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202510149204.XA CN119900458B (en) | 2025-02-11 | 2025-02-11 | High deflection screw drilling tools |
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| CN119900458B true CN119900458B (en) | 2025-07-18 |
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| US4252201A (en) * | 1979-08-27 | 1981-02-24 | Dowis James W | Drilling method and apparatus |
| CN220415261U (en) * | 2023-08-04 | 2024-01-30 | 中建二局第三建筑工程有限公司 | Multi-gear-set roller bit suitable for karst geology |
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| CN119900458A (en) | 2025-04-29 |
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