High build rate positive displacement motor

Abstract

The present invention relates to a high-build steerable positive displacement motor drill applied to the field of drill tools, which includes a bypass valve assembly. The bottom of the bypass valve assembly is connected to a motor assembly, and the bottom of the motor assembly is connected to a universal shaft assembly. By means of the cooperation of the outer layer gear, the inner layer gear, the middle layer gear, the drill bit and the inclined pull rod, the adjustment of the working surface of the drill bit can be realized. And with the cooperation of the wedge-shaped insertion part and the lead screw, the self-adaptive adjustment of the drilling size during the operation of the drill bit can be realized, meeting the requirements of different drilling sizes. Moreover, with the movable connection between the inclined pull rod and the strip-shaped groove, when the drill bit moves outwards, the synchronous rotation of the drive housing and the drill bit is ensured, ensuring that the drill bit after being processed by the adjustment unit can still carry out normal drilling work.

Description

Technical Field

[0001] The present invention relates to a positive displacement downhole motor, and particularly to a high build-rate positive displacement downhole motor applied to the field of drilling tools. Background Art

[0002] A positive displacement downhole motor is a positive displacement downhole power drill that uses drilling fluid as power to convert liquid pressure energy into mechanical energy. It mainly consists of a bypass valve, a positive displacement motor (rotor and stator), a universal joint, bearings, a drive shaft, etc. Among them, a high build-rate positive displacement downhole motor is a drilling tool used for directional well construction. By shortening the distance between the bend point and the end face of the rotor input joint by a certain distance, such as 300 - 400 mm, the distance between the drill bit and the bend point is reduced, thereby increasing the build rate.

[0003] The specification of Chinese invention patent CN118110416A discloses a high build-rate and efficient positive displacement downhole motor. This invention has good build and compounding capabilities, so that the service life of the whole machine is at least 2 - 3 times that of the existing ones. In addition, the specification of Chinese patent CN213980634U discloses a high build-rate positive displacement downhole motor for medium-radius horizontal wells. During the compound drilling process, the middle centralizer can reduce the vibration of the positive displacement downhole motor, make the wellbore smoother and reduce the full angle change rate of the wellbore trajectory. The operation in the whole well section can greatly reduce the sliding ratio, reduce the time and number of directional construction during the drilling process, and improve the drilling efficiency.

[0004] The drill bit in the existing high build-rate drilling tools is usually fixedly installed. During use, the drill bit will wear, which is not conducive to subsequent drilling. In addition, during the actual downhole drilling process, the inner diameter of the well is in a dynamic change state, and it is difficult for the fixedly installed drill bit to achieve the corresponding change in the drilling size, which limits the practicability of the high build-rate positive displacement downhole motor. Summary of the Invention

[0005] Aiming at the above-mentioned prior art, the technical problem to be solved by the present invention is how to switch the working surface of the drill bit during the corresponding drilling process to avoid the worn working surface from continuing to work, and at the same time, adaptively adjust the drilling size of the drill bit to meet the changing drilling requirements.

[0006] To solve the above problems, the present invention provides a high-build inclination screw drill, which includes a bypass valve assembly. The bottom of the bypass valve assembly is connected to a motor assembly. The bottom of the motor assembly is connected to a universal shaft assembly. The bottom of the universal shaft assembly is connected to a drive shaft assembly. The drive shaft assembly includes a drive housing and a drive shaft body. The tail end of the drive shaft body extends into the interior of the drive housing, and the tail end of the drive shaft body is connected to the inner wall of the drive housing through a short rod. The bottom wall of the drive housing is provided with an inner layer gear. A plurality of middle layer gears are circumferentially meshed and connected outside the inner layer gear. Each middle layer gear is meshed and connected with an outer layer gear outside. A plug rod is installed through the interior of the outer layer gear. A drill bit is installed at the bottom of the plug rod;

[0007] The surface of the drive housing near the bottom end is provided with a plurality of notches corresponding to the drill bits one by one. A double drive motor with two drive ends is installed inside the drive housing. One of the drive ends of the double drive motor is connected to the inner layer gear. An adjustment unit is installed inside the drive housing. The surface of the drive housing is provided with strip-shaped grooves corresponding to the plurality of notches one by one and located above the notches. The top of the plug rod is connected to an inclined pull rod through a hinge ball, and the tail end of the inclined pull rod is movably connected to the strip-shaped groove through a hinge ball.

[0008] In the above high-build inclination screw drill, by using the cooperation of the outer layer gear, the inner layer gear, the middle layer gear, the drill bit and the inclined pull rod, the adjustment of the working surface of the drill bit can be realized. And with the cooperation of the wedge-shaped plug-in part and the lead screw, the self-adaptive adjustment of the drilling size during the operation of the drill bit can be realized, meeting the requirements of different drilling sizes.

[0009] As a further improvement of the present application, the adjustment unit includes a lead screw located below the drive shaft body. The other drive end of the double drive motor is connected to the lead screw. A moving sleeve is threadedly sleeved on the surface of the lead screw. A plurality of L-shaped bridge rods with a cross-section are fixedly installed on the surface of the moving sleeve. The bottom end of the bridge rod is connected to a wedge-shaped plug-in part through a self-resetting rotating shaft.

[0010] As a further improvement of the present application, the middle layer gear includes 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 a plug hole located in the middle of the two cylindrical grooves are provided on the surface of the fixed part near the movable part. A tension spring is connected inside the cylindrical groove, and the tail end of the tension spring is connected to the surface of the movable part. Two plug blocks matching the plug hole are connected to the surface of the movable part.

[0011] As a further improvement of the present application, the cross-section of the wedge-shaped plug-in part is a right trapezoid. The projection of the bottom end of the wedge-shaped plug-in part in the vertical direction is located at the gap between the fixed part and the movable part, and the wedge-shaped plug-in part is located between the two plug blocks.

[0012] As a further improvement of the present application, annular grooves are provided on the top surfaces of the middle-layer gear and the outer-layer gear. A bridging member with an inverted U-shaped cross-section is movably connected inside the two annular grooves through a hinged ball. A return spring is connected to the top of the bridging member, and the top of the return spring is fixedly connected to a disc. A sliding rod with an L-shaped cross-section is rotatably connected to the top of the disc, and the sliding rod slidably penetrates through the inside of the bridge rod.

[0013] As a further improvement of the present application, in the initial state, there is a horizontal gap between the end of the sliding rod facing away from the outer-layer gear and the surface of the double-drive motor, and the cross-sectional width value of the movable part is greater than the maximum thickness value of the wedge-shaped plug-in part.

[0014] As a further improvement of the present application, the drive shaft assembly further includes a housing, the bottom of the housing is rotatably connected to the top of the drive housing, and in the initial state, the part of the drill bit protruding from the drive housing in the vertical direction is not less than half of the volume of the drill bit.

[0015] As another improvement of the present application, the working method includes the following steps:

[0016] S1. When drilling, the drive shaft body rotates to drive the drive housing to rotate, and the drill bit rotates synchronously with the drive housing under the action of the inclined pull rod for drilling treatment;

[0017] S2. After the working surface of the drill bit is worn, utilize the meshing action of the double-drive motor, the inner-layer gear, the middle-layer gear and the outer-layer gear to drive the adjustment of the working surface of the drill bit, and then continue the drilling work;

[0018] S3. When it is necessary to adjust the drilling size, use the lead screw to drive the wedge-shaped plug-in part to descend, drive the movable part to move away from the inner-layer gear, drive the outer-layer gear to move synchronously, at this time the inclined pull rod moves down, and then continue the drilling work;

[0019] S4. On the basis of S3, when it is necessary to adjust the working surface of the drill bit, the middle-layer gear can be driven to rotate, and utilize the meshing action between the movable part and the outer-layer gear to drive the adjustment of the working surface of the drill bit.

[0020] In summary, by using the cooperation of the outer-layer gear, the inner-layer gear, the middle-layer gear, the drill bit and the inclined pull rod, the adjustment of the working surface of the drill bit can be realized, and with the cooperation of the wedge-shaped plug-in part and the lead screw, the self-adaptive adjustment of the drilling size during the operation of the drill bit can be realized to meet different drilling size requirements. Moreover, by virtue of the movable connection between the inclined pull rod and the strip-shaped groove, when the drill bit moves outwards, the synchronous rotation of the drive housing and the drill bit is ensured, ensuring that the drill bit can still carry out normal drilling work after being processed by the adjustment unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the first embodiment of the present application;

[0022] Figure 2 Schematic diagram of the internal structure of the drive housing for the first embodiment of the present application;

[0023] Figure 3 Installation diagram of the outer gear, inner gear and middle gear for the first embodiment of the present application;

[0024] Figure 4 Schematic diagram of the installation of the bridging member and the return spring for the first embodiment of the present application;

[0025] Figure 5 State diagram of the drill bit when adjusting the working surface for the first embodiment of the present application;

[0026] Figure 6 Schematic diagram of the installation of the tension spring and the plug-in block for the first embodiment of the present application;

[0027] Figure 7 Schematic diagram of the state of the drill bit moving outwards for the first embodiment of the present application;

[0028] Figure 8 Schematic diagram of the state of the inclined pull rod when the drill bit moves outwards for the first embodiment of the present application;

[0029] Figure 9 Schematic diagram of the state of adjusting the working surface when the drill bit moves outwards for the first embodiment of the present application;

[0030] Figure 10 Schematic diagram of the working steps for the second embodiment of the present application.

[0031] Description of the reference numerals in the figure:

[0032] 1. Bypass valve assembly; 2. Motor assembly; 3. Cardan shaft assembly; 4. Transmission shaft assembly; 41. Transmission shaft body; 42. Drive housing; 5. Drill bit; 6. Inclined pull rod; 7. Dual drive motor; 8. Outer gear; 9. Middle gear; 10. Inner gear; 11. Lead screw; 12. Bridge rod; 13. Wedge-shaped plug-in part; 14. Return spring; 15. Bridging member; 16. Tension spring; 17. Plug-in block. Specific embodiments

[0033] The following describes the two embodiments of the present application in detail with reference to the accompanying drawings.

[0034] The first embodiment:

[0035] Figure 1-3A high-build steerable positive displacement motor drill is shown, including a bypass valve assembly 1. The bottom of the bypass valve assembly 1 is connected to a motor assembly 2. The bottom of the motor assembly 2 is connected to a universal joint assembly 3. The bottom of the universal joint assembly 3 is connected to a drive shaft assembly 4. The drive shaft assembly 4 includes a drive housing 42 and a drive shaft body 41. The tail end of the drive shaft body 41 extends into the interior of the drive housing 42, and the tail end of the drive shaft body 41 is connected to the inner wall of the drive housing 42 through a short rod. An inner layer gear 10 is installed on the bottom wall of the drive housing 42. A plurality of middle layer gears 9 are circumferentially meshed and connected outside the inner layer gear 10. An outer layer gear 8 is meshed and connected to the outside of each middle layer gear 9. A plug rod is installed through the interior of the outer layer gear 8. A drill bit 5 is installed at the bottom of the plug rod;

[0036] A plurality of notches corresponding to the drill bit 5 one by one are provided on the surface of the drive housing 42 near the bottom end. A double drive motor 7 with two drive ends is installed inside the drive housing 42. One of the drive ends of the double drive motor 7 is connected to the inner layer gear 10. An adjustment unit is installed inside the drive housing 42. Strip-shaped grooves corresponding to the plurality of notches one by one and located above the notches are provided on the surface of the drive housing 42. The top of the plug rod is connected to an inclined pull rod 6 through a hinge ball, and the tail end of the inclined pull rod 6 is movably connected to the strip-shaped groove through a hinge ball.

[0037] The drive shaft assembly 4 further includes a housing. The bottom of the housing is rotatably connected to the top of the drive housing 42. In the initial state, the part of the drill bit 5 protruding from the drive housing 42 in the vertical projection is not less than half of the volume of the drill bit 5.

[0038] Specifically, when this positive displacement motor drill works, the bypass valve assembly 1, the motor assembly 2, the universal joint assembly 3, and the drive shaft assembly 4 are utilized (their working principles are all prior arts and will not be elaborated here).

[0039] When the drive shaft body 41 rotates, it drives the drive housing 42 to rotate. Since the drill bit 5 is connected through the plug rod and the inclined pull rod 6, and the inclined pull rod 6 is movably connected to the strip-shaped groove on the surface of the drive housing 42, when the drive housing 42 rotates, it can drive the inclined pull rod 6 to rotate synchronously, thereby driving the drill bit 5 to rotate synchronously with the drive housing 42, enabling the three drill bits 5 to move synchronously and realizing the drilling process.

[0040] After the initial working surface of the drill bit 5 is worn, at this time, the remaining part of the drill bit 5 (that is, the part of the drill bit 5 in the vertical projection located inside the drive housing 42 in the initial state) is in a normal usable state. At this time, start one of the drive ends of the double drive motor 7 to drive the inner layer gear 10 to rotate. Under the meshing action, it can indirectly drive the outer layer gear 8 to rotate synchronously (because the plug rod and the inclined pull rod 6 are movably connected, so when the outer layer gear 8 rotates, the inclined pull rod 6 is not affected), and further drive the drill bit 5 to realize the adjustment of the working surface (such as Figure 5as shown).

[0041] Figure 3 As shown, the adjusting unit includes a lead screw 11 located below the transmission shaft body 41, and the other driving end of the double driving motor 7 is connected to the lead screw 11. A moving sleeve is threadedly sleeved on the surface of the lead screw 11. A plurality of L-shaped bridge rods 12 are fixedly installed on the surface of the moving sleeve. The bottom end of the bridge rod 12 is connected with a wedge-shaped plug-in member 13 through a self-resetting rotating shaft.

[0042] The cross-section of the wedge-shaped plug-in member 13 is a right trapezoid. The projection of the bottom end of the wedge-shaped plug-in member 13 in the vertical direction is located at the gap between the fixed part and the movable part, and the wedge-shaped plug-in member 13 is located in the middle of the two plug-in blocks 17.

[0043] When it is necessary to switch the working radius of the drill bit 5 (that is, the size of the drilled well), it is necessary to first adjust the position of the middle layer gear 9, that is, it is necessary to make the gap between the fixed part and the movable part vertically located below the wedge-shaped plug-in member 13 (infrared transmitters and infrared receivers can be installed on the surfaces of the fixed part and the wedge-shaped plug-in member 13 respectively to assist in the adjustment, and the alignment means is not limited to one). Subsequently, start the other driving end of the double driving motor 7 to make the lead screw 11 rotate, thereby driving the bridge rod 12 to move downward, and then driving the wedge-shaped plug-in member 13 to descend. The fixed part and the movable part can be separated by means of the gradually widening wedge-shaped plug-in member 13, so that the movable part meshing with the outer layer gear 8 can drive the outer layer gear 8 to move away from the double driving motor 7, thereby indirectly driving the drill bit 5 to move outward and expanding the size of the well in the well during drilling (such as Figure 7 as shown).

[0044] As the drill bit 5 moves outward, the height position of the inclined pull rod 6 movably connected to the drill bit 5 through the plug-in rod in the strip-shaped groove also gradually decreases, so that after the drill bit 5 moves outward, it can still maintain synchronous movement with the driving housing 42 by virtue of the movable connection with the inclined pull rod 6, so as to normally perform the corresponding drilling operation (such as Figure 8 as shown).

[0045] Figure 6 As shown, the middle layer gear 9 includes 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 a plug-in hole located in the middle of the two cylindrical grooves are provided on the surface of the fixed part close to the movable part. A tension spring 16 is connected inside the cylindrical groove, and the tail end of the tension spring 16 is connected to the surface of the movable part. Two plug-in blocks 17 matching the plug-in hole are connected to the surface of the movable part.

[0046] Specifically, when the drill bit 5 moves outward, the tension spring 16 connected to the movable part will be stretched accordingly. When resetting is required, with the upward movement of the wedge-shaped plug-in member 13, the movable part will be driven to reset under the action of the tension spring 16, and the movable part and the fixed part will be plugged and constrained to form an integral body by virtue of the action of the plug-in block 17.

[0047] Figure 4 It is shown that annular grooves are provided on the top surfaces of both the middle layer gear 9 and the outer layer gear 8. Inside the two annular grooves, a bridging member 15 with an inverted U-shaped cross-section is movably connected through a hinge ball. A return spring 14 is connected to the top of the bridging member 15. The top of the return spring 14 is fixedly connected to a disc. The top of the disc is rotatably connected to a sliding rod with an L-shaped cross-section, and the sliding rod slidably penetrates through the inside of the bridge rod 12.

[0048] Specifically, when the movable part and the fixed part are combined, due to the connection function of the bridging member 15, when the movable part is reset, it can drive the outer layer gear 8 to move synchronously, so as to ensure that the meshing effect is stably maintained.

[0049] When the wedge-shaped plug-in member 13 moves downward, it will squeeze the return spring 14, and there is a movable space. And because the installation angle of the bridge rod 12 is fixed, the sliding rod and the return spring 14 can play a restraining role on the bridging member 15, so that the ends of the bridging member 15 can move relatively in the two annular grooves respectively without being affected by the rotation of the outer layer gear 8 and the middle layer gear 9. Even when the fixed part and the movable part of the middle layer gear 9 are in a separated state, the annular groove on the surface of the movable part still remains connected to the bridging member 15.

[0050] In the initial state, there is a horizontal gap between the end of the sliding rod facing away from the outer layer gear 8 and the surface of the double-drive motor 7, and the cross-sectional width value of the movable part is greater than the maximum thickness value of the wedge-shaped plug-in member 13.

[0051] Specifically, when the fixed part and the movable part are separated, the sliding rod penetrates and moves synchronously, without affecting the stability of the bridging member 15.

[0052] When the working surface of the drill bit 5 needs to be adjusted in the separated state of the fixed part and the movable part, by using the rotation of the inner layer gear 10, the fixed part can be driven to rotate slightly. At this time, due to the difference between the cross-sectional width value of the movable part and the thickness of the wedge-shaped plug-in member 13, even in the maximum separated state, the fixed part and the movable part still overlap. Therefore, when the fixed part rotates slightly, the movable part rotates synchronously, and the drill bit 5 can be driven to adjust the working surface slightly by virtue of the meshing between the movable part and the outer layer gear 8 (as Figure 9 shown).

[0053] During this process, since the wedge-shaped plug-in member 13 is rotatably connected to the bridge rod 12, when the drill bit 5 adjusts the working surface, the wedge-shaped plug-in member 13 can synchronously complete the corresponding deflection and can be automatically reset under the action of the automatic reset shaft after being lifted and reset.

[0054] The second implementation method:

[0055] Figure 10 The shown working method includes the following steps:

[0056] S1. During drilling, the rotation of the transmission shaft body 41 drives the rotation of the drive housing 42, and the drill bit 5 rotates synchronously with the drive housing 42 under the action of the inclined pull rod 6 to perform drilling treatment;

[0057] S2. After the working surface of the drill bit 5 is worn, the meshing action of the double drive motors 7, the inner layer gear 10, the middle layer gear 9 and the outer layer gear 8 is used to drive the adjustment of the working surface of the drill bit 5, and then the drilling work continues;

[0058] S3. When the drilling size needs to be adjusted, the lead screw 11 is used to drive the wedge-shaped plug-in member 13 to descend, drive the movable part to move away from the inner layer gear 10, drive the outer layer gear 8 to move synchronously. At this time, the inclined pull rod 6 moves downward, and then the drilling work continues;

[0059] S4. On the basis of S3, when the working surface of the drill bit 5 needs to be adjusted, the middle layer gear 9 can be driven to rotate, and the meshing action between the movable part and the outer layer gear 8 is used to drive the adjustment of the working surface of the drill bit 5.

[0060] In summary, by using the cooperation of the outer layer gear 8, the inner layer gear 10, the middle layer gear 9, the drill bit 5 and the inclined pull rod 6, the adjustment of the working surface of the drill bit 5 can be realized. And with the cooperation of the wedge-shaped plug-in member 13 and the lead screw 11, the self-adaptive adjustment of the drilling size during the operation of the drill bit 5 can be realized, meeting the requirements of different drilling sizes. And by virtue of the movable connection between the inclined pull rod 6 and the strip-shaped groove, when the drill bit 5 moves outward, the synchronous rotation of the drive housing 42 and the drill bit 5 is ensured, ensuring that the drill bit 5 can still perform normal drilling work after being processed by the adjustment unit.

[0061] Combined with the current actual needs, the above-mentioned implementation manner adopted in this application, the protection scope is not limited to this. Within the scope of knowledge possessed by those skilled in the art, various changes made without departing from the concept of this application still fall within the protection scope of the present invention.

Claims

1. High build rate screw drill, including a bypass valve assembly (1), the bottom of the bypass valve assembly (1) is connected to a motor assembly (2), the bottom of the motor assembly (2) is connected to a universal shaft assembly (3), the universal shaft assembly (3), the bottom of the universal shaft assembly (3) is connected to a drive shaft assembly (4), characterized in that: The drive shaft assembly (4) includes a drive housing (42) and a drive shaft body (41). The tail end of the drive shaft body (41) extends into the interior of the drive housing (42), and the tail end of the drive shaft body (41) is connected to the inner wall of the drive housing (42) through a short rod. An inner layer gear (10) is installed on the bottom wall of the drive housing (42). A plurality of middle layer gears (9) are circumferentially meshed and connected to the outside of the inner layer gear (10). An outer layer gear (8) is meshed and connected to the outside of each middle layer gear (9). A plug rod is installed through the inside of the outer layer gear (8), and a drill bit (5) is installed at the bottom of the plug rod; A plurality of notches corresponding to the drill bit (5) one by one are provided on the surface of the drive housing (42) near the bottom end. A dual-drive motor (7) with two drive ends is installed inside the drive housing (42). One of the drive ends of the dual-drive motor (7) is connected to the inner layer gear (10). An adjustment unit is installed inside the drive housing (42). Strip-shaped grooves corresponding to the plurality of notches one by one and located above the notches are provided on the surface of the drive housing (42). The top of the plug rod is connected to an inclined pull rod (6) through a hinge ball, and the tail end of the inclined pull rod (6) is movably connected to the strip-shaped groove through a hinge ball; The adjustment unit includes a lead screw (11) located below the drive shaft body (41). The other drive end of the dual-drive motor (7) is connected to the lead screw (11). A moving sleeve is threadedly sleeved on the surface of the lead screw (11). A plurality of L-shaped bridge rods (12) are fixedly installed on the surface of the moving sleeve. The bottom end of the bridge rod (12) is connected to a wedge-shaped plug-in member (13) through a self-resetting rotating shaft; The cross-section of the wedge-shaped plug-in member (13) is a right trapezoid. The projection of the bottom end of the wedge-shaped plug-in member (13) in the vertical direction is located at the gap between the fixed part and the movable part. The wedge-shaped plug-in member (13) is located between two plug-in blocks (17). The middle layer gear (9) includes a fixed part and a movable part; When it is necessary to switch the working radius of the drill bit (5), it is necessary to first adjust the position of the middle layer gear (9), that is, it is necessary to make the gap between the fixed part and the movable part vertically located below the wedge-shaped plug-in member (13). Subsequently, start the other drive end of the dual-drive motor (7) to make the lead screw (11) rotate, thereby driving the bridge rod (12) to move downward, and then driving the wedge-shaped plug-in member (13) to descend. The fixed part and the movable part can be separated by means of the gradually widening wedge-shaped plug-in member (13), so that the movable part meshing with the outer layer gear (8) can drive the outer layer gear (8) to move away from the dual-drive motor (7), thereby indirectly driving the drill bit (5) to move outward and expanding the size of the wellbore during drilling.

2. The high-deflection screw drill 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 a plug-in hole located between the two cylindrical grooves are provided on the surface of the fixed part near the movable part. A tension spring (16) is connected inside the cylindrical groove, and the tail end of the tension spring (16) is connected to the surface of the movable part. Two plug-in blocks (17) matching the plug-in hole are connected to the surface of the movable part.

3. The high-deflection screw drill tool according to claim 2, characterized in that: The top surfaces of the middle layer gear (9) and the outer layer gear (8) are both provided with annular grooves. Inside the two annular grooves, a bridging member (15) with an inverted U-shaped cross-section is movably connected through a hinge ball. The top of the bridging member (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 cross-section. The sliding rod slidably penetrates through the inside of the bridge rod (12).

4. The high-deflection screw drill tool according to claim 3, wherein: In the initial state, there is a horizontal gap between the end of the sliding rod away from the outer layer gear (8) and the surface of the double-drive motor (7). The cross-sectional width value of the movable part is greater than the maximum thickness value of the wedge-shaped plug-in member (13).

5. The high-angle build screw drill tool according to claim 4, wherein: The drive shaft assembly (4) further includes a housing. The bottom of the housing is rotatably connected to the top of the drive housing (42). In the initial state, the part of the drill bit (5) protruding from the drive housing (42) in the vertical direction is not less than half of the volume of the drill bit (5).

6. The high-angle build screw drill tool according to claim 5, wherein, The working method includes the following steps: S1. During drilling, the drive shaft body (41) rotates to drive the drive housing (42) to rotate. Under the action of the inclined pull rod (6), the drill bit (5) rotates synchronously with the drive housing (42) for drilling treatment; S2. After the working surface of the drill bit (5) is worn, by using 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), the working surface of the drill bit (5) is driven to be adjusted, and then drilling work continues; S3. When it is necessary to adjust the drilling size, the lead screw (11) is used to drive the wedge-shaped plug-in member (13) to descend, drive the movable part to move away from the inner layer gear (10), drive the outer layer gear (8) to move synchronously. At this time, the inclined pull rod (6) moves downward, and then drilling work continues; S4. On the basis of S3, when it is necessary to adjust the working surface of the drill bit (5), the middle layer gear (9) can be driven to rotate, and by using the meshing action between the movable part and the outer layer gear (8), the working surface of the drill bit (5) is driven to be adjusted.

Images