Drilling deviation prevention device for core drilling

Abstract

The invention relates to the technical field of drill rod stabilizers, and discloses a drilling anti-deviation device for core drilling, which comprises a lifting guide rail, a lifting platform, a hydraulic motor and a drill rod, the lifting platform is slidably arranged on the lifting guide rail, the hydraulic motor is arranged on the lifting platform and drives the drill rod, and a mounting bracket is arranged at the bottom of the lifting guide rail. A plurality of annular limiting assemblies are stacked on the mounting support, and a drill rod penetrates through the limiting assemblies to drill. Compared with the prior art, the composite shock absorption ring has the advantages that through the composite structure of the shock absorption ring, transverse shock of the drill rod is converted into reciprocating motion of the plunger, the drill rod is forced to reset by utilizing the elasticity difference of the spring, shock energy is consumed when hydraulic oil flows through the damping valve, impact force is greatly reduced, and hydraulic oil circulation resistance is dynamically adjusted; and the Hall sensor monitors the displacement of the magnetized plunger in real time to reflect the tremor of the drill rod, so that the automatic adjustment of damping is realized, and the tremor amplitude is controlled within a safe range.

Description

Technical Field

[0001] The invention relates to the technical field of drill rod stabilizers, in particular to a drilling deviation prevention device for core drilling. Background Art

[0002] A core drill's anti-drift device is a critical system for ensuring the drill trajectory remains as vertical as possible or at a predetermined angle. This is particularly crucial in deep holes, complex formations, or exploration requiring high precision. Drilling deviation not only affects accurate arrival at the target layer, wasting time and money, but can also lead to incorrect core sample positioning, abandoned drill holes, and even accidents.

[0003] A common anti-deviation device is a mechanical stabilizer for straightening. It is usually installed on the rigid short section above the core barrel and in the middle and lower part of the drill string, close to or slightly smaller than the borehole diameter, to provide a support point, limit the lateral vibration and bending of the drill string, and keep it as close to the centerline of the borehole as possible.

[0004] In the actual use of core drilling rigs, the bottom drill bit will be subjected to a large reaction force when encountering hard rocks during the drilling process. When this force is transmitted to the drill pipe, it is easy to cause lateral vibration of the drill pipe. Since the anti-drifting device and the drill pipe are mechanically rigidly connected, the vibration of the drill pipe can easily cause damage to the drill pipe and the anti-drifting device under long-term action. Summary of the Invention

[0005] The technical problem to be solved by the present invention is that a common anti-drifting device is rigidly connected to a drill rod, and a drilling anti-drifting device for core drilling is provided.

[0006] In order to solve the above technical problems, the technical solution provided by the present invention is: a drilling anti-deviation device for core drilling, including a lifting guide rail, a lifting platform, a hydraulic motor and a drill rod, the lifting platform is slidably set on the lifting guide rail, the lifting platform is provided with a hydraulic motor, the hydraulic motor drives the drill rod, a mounting bracket is provided at the bottom of the lifting guide rail, and a plurality of annular limit assemblies are stacked on the mounting bracket, and the drill rod passes through the limit assembly for drilling.

[0007] The limit assembly is composed of a support plate, a shock-absorbing assembly and an annular transmission box stacked in sequence from bottom to top, wherein the shock-absorbing assembly is composed of a wear-resistant ring, a shock-absorbing ring and a liquid storage ring nested from the inside to the outside, and a plurality of hydraulic cylinders pointing to the center of the shock-absorbing ring are arranged around the shock-absorbing ring, a magnetized plunger is slidingly arranged in the hydraulic cylinder, and a ball is slidingly arranged at the outer end of the magnetized plunger, a spring is provided in the hydraulic cylinder to extend the magnetized plunger and the ball toward the center of the shock-absorbing ring, an annular liquid storage cavity is provided in the liquid storage ring, and a plurality of connecting holes are provided in the inner ring of the liquid storage ring to connect the hydraulic cylinder with the liquid storage cavity, and the liquid storage cavity and the hydraulic cylinder are provided with hydraulic oil by an external hydraulic pump station, and a damping valve with adjustable flow is provided between the hydraulic cylinder and the connecting hole.

[0008] Furthermore, a valve core is rotatably arranged inside the damping valve, first damping holes are arranged on both sides of the damping valve and are respectively communicated with the connecting hole and the hydraulic cylinder, and the valve core is provided with a through second damping hole.

[0009] Furthermore, an outer mounting groove matching the outer contour of the damping valve is provided at the connection between the inner ring connecting hole of the liquid storage ring and the hydraulic cylinder, and an inner mounting groove matching the outer contour of the damping valve is provided at the connection between the outer ring hydraulic cylinder of the shock absorbing ring and the connecting hole, and the damping valve is nested in the outer mounting groove and the inner mounting groove.

[0010] Furthermore, a gear ring is rotatably arranged inside the annular transmission box, a plurality of planetary gears are arranged to rotate on the inner ring at the bottom of the annular transmission box, an input gear is rotatably arranged on the outer side at the top, an outer gear ring is arranged on the top of the gear ring to mesh with the input gear, an inner gear ring is arranged on the bottom to mesh with the planetary gears, a transmission rod is arranged on the top of the valve core, and a plurality of third through holes are arranged on the bottom of the annular transmission box, and the transmission rod passes through the third through holes to be dynamically connected to the planetary gears.

[0011] Furthermore, a motor is arranged outside the annular transmission box, and an output end of the motor is connected to the input gear power.

[0012] Furthermore, a lower mounting groove is provided below the shock absorbing ring and is nested in the outer ring of the hydraulic cylinder, and a Hall sensor is provided in the mounting groove.

[0013] Furthermore, a plurality of limiting holes for matching balls are provided around the wear-resistant ring.

[0014] Furthermore, the support plate is provided with a plurality of inner slots around the periphery, and the shock absorbing assembly and the outer ring of the annular transmission box are provided with a plurality of positioning clips matching the inner slots around the periphery, and the positioning clips slide vertically into the inner slots for limiting.

[0015] Furthermore, the mounting bracket is provided with an outer card slot that matches the inner card slot, and the inner card slot slides vertically into the outer card slot for positioning.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] Through the composite structure of the shock-absorbing ring, the lateral vibration of the drill pipe is converted into the reciprocating motion of the magnetized plunger, and the difference in spring elastic force is used to force the drill pipe to reset.

[0018] At the same time, the hydraulic oil in the shock-absorbing ring consumes vibration energy when flowing through the damping valve, greatly reducing the impact force transmitted to the drill rod and anti-deviation device, avoiding mechanical damage.

[0019] By rotating the valve core to change the overlapping area of the first / second damping holes, the hydraulic oil flow resistance is dynamically adjusted to adapt to the vibration intensity caused by different formation hardness. The Hall sensor monitors the displacement of the magnetized plunger in real time to reflect the drill pipe vibration, realize automatic adjustment of the damping, and control the vibration amplitude within a safe range. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the present invention.

[0021] Figure 2 It is a structural schematic diagram of the mounting bracket of the present invention.

[0022] Figure 3 It is a schematic diagram of the exploded structure of the mounting bracket of the present invention.

[0023] Figure 4 It is a structural schematic diagram of the limit assembly of the present invention.

[0024] Figure 5 It is a schematic diagram of the explosion structure of the limit assembly of the present invention.

[0025] Figure 6 It is a schematic structural diagram of the shock absorbing assembly of the present invention.

[0026] Figure 7 It is a schematic diagram of the explosion structure of the shock absorbing assembly of the present invention.

[0027] Figure 8 It is a structural schematic diagram of the damping valve of the present invention.

[0028] Figure 9 It is a schematic diagram of the explosion structure of the damping valve of the present invention.

[0029] Figure 10 It is a schematic cross-sectional structural diagram of the shock absorbing assembly of the present invention.

[0030] Figure 11 It is a schematic cross-sectional view of the shock absorbing assembly of the present invention when the drill pipe vibrates.

[0031] Figure 12 It is a schematic diagram of the internal structure of the annular transmission box of the present invention.

[0032] Figure 13 It is a schematic diagram of the bottom structure of the annular transmission box of the present invention.

[0033] Figure 14 It is a schematic diagram of the power drive relationship between the annular transmission box and the damping valve of the present invention.

[0034] As shown in the figure: 1. Lifting guide rail, 2. Lifting platform, 3. Hydraulic motor, 4. Drill rod, 5. Mounting bracket, 6. Limit assembly, 7. External slot, 8. First through hole, 9. Support plate, 10. Shock absorbing assembly, 11. Annular transmission box, 12. Internal slot, 13. Positioning latch, 14. Second through hole, 15. Wear-resistant ring, 16. Shock absorbing ring, 17. Liquid storage ring, 18. Ball, 19. Damping valve, 20. Hydraulic oil interface, 21. External mounting groove, 22. Connecting hole, 23. Inner mounting groove, 24. Hydraulic cylinder, 25. Lower mounting groove, 26. Hall sensor, 27. Limit hole, 28. Valve cover, 29. Valve core, 30. Transmission rod, 31. First damping hole, 32. Second damping hole, 33. Magnetized plunger, 34. Spring, 35. Liquid storage chamber, 36. Gear ring, 37. Input gear, 38. Planetary gear, 39. Outer ring gear, 40. Inner ring gear, 41. Third through hole, 42. Motor. DETAILED DESCRIPTION

[0035] The present invention will be described in further detail below with reference to the accompanying drawings.

[0036] Combined with attachment Figure 1 , Attachment Figure 2 and attached Figure 3 A drilling anti-deviation device for core drilling includes a lifting guide rail 1, a lifting platform 2, a hydraulic motor 3 and a drill rod 4. The lifting platform 2 is slidably arranged on the lifting guide rail 1. The lifting platform 2 is provided with a hydraulic motor 3. The hydraulic motor 3 drives the drill rod 4. A mounting bracket 5 is provided at the bottom of the lifting guide rail 1. A plurality of annular limit assemblies 6 are stacked on the mounting bracket 5.

[0037] Combined with attachment Figure 4 , Attachment Figure 5 , Attachment Figure 6 and attached Figure 7 The limit assembly 6 is composed of a support plate 9, an annular shock-absorbing assembly 10 and an annular transmission box 11 stacked in sequence from bottom to top, wherein the shock-absorbing assembly 10 is nested from the inside to the outside by a wear-resistant ring 15, a shock-absorbing ring 16 and a liquid storage ring 17. A first through hole 8 is provided in the middle of the mounting bracket 5, and a second through hole 14 is provided on the support plate 9. The first through hole 8 and the second through hole 14 are coaxially aligned with the above-mentioned annular contour assembly to avoid the drill rod 4, and the drill rod 4 drills downward through these holes.

[0038] Combined with attachment Figure 7 and attached Figure 10A plurality of hydraulic cylinders 24 pointing to the center of the shock-absorbing ring 16 are arranged around the shock-absorbing ring 16, a magnetized plunger 33 is slidably arranged in the hydraulic cylinder 24, a seal is applied between the magnetized plunger 33 and the inner wall of the hydraulic cylinder 24, a ball 18 is slidably arranged at the outer end of the magnetized plunger 33, a plurality of limiting holes 27 for matching the ball 18 are arranged around the wear-resistant ring 15, a spring 34 is provided in the hydraulic cylinder 24 to push the magnetized plunger 33 and the ball 18 toward the center of the shock-absorbing ring 16, and the limiting hole 27 prevents the ball 18 from falling out.

[0039] Combined with attachment Figure 8 , Attachment Figure 9 and attached Figure 10 A ring-shaped liquid storage chamber 35 is provided in the liquid storage ring 17, and a plurality of connecting holes 22 are provided in the inner ring of the liquid storage ring 17 to connect the hydraulic cylinder 24 with the liquid storage chamber 35. A hydraulic oil interface 20 is provided on the outside of the liquid storage ring 17. The external hydraulic pump station provides hydraulic oil to the liquid storage chamber 35 and the hydraulic cylinder 24 through the hydraulic oil interface 20. A damping valve 19 with adjustable flow is provided between the hydraulic cylinder 24 and the connecting hole 22. A valve core 29 is rotatably provided inside the damping valve 19, and a valve cover 28 is provided on the top. First damping holes 31 are provided on both sides of the damping valve 19, which are respectively connected with the connecting hole 22 and the hydraulic cylinder 24, and the valve core 29 is provided with a through second damping hole 32.

[0040] Combined with attachment Figure 10 and attached Figure 11 The drill rod 4 rotates downward through the center of the wear-resistant ring 15 to drill downward. The external hydraulic pump station provides hydraulic oil to the liquid storage ring 17. The magnetized plunger 33 is pushed by the hydraulic oil pressure and the elastic force of the spring 34, so that the magnetized plunger 33 pushes the ball 18 to form a tight pressure against the drill rod 4. If hard rock is encountered during the drilling process, causing the drill rod 4 to vibrate laterally, the lateral movement of the drill rod 4 will drive the magnetized plunger 33 to move telescopically in the hydraulic cylinder 24 through the ball 18. The movement of the magnetized plunger 33 will cause the volume of the hydraulic cylinder 24 to change, forcing the hydraulic oil to flow between the hydraulic cylinder 24 and the liquid storage chamber 35. During the flow of hydraulic oil, it will pass through the flow channel formed by the first damping hole 31 and the second damping hole 32 of the damping valve 19. The movement of the magnetized plunger 33 will also change the compression degree of the spring 34. When the elastic force of each spring 34 has different elastic forces due to different compression degrees, the vibrating drill rod 4 is forced to return to the central position by the elastic forces in all directions.

[0041] Since the valve core 29 is rotatable, the first damping hole 31 and the second damping hole 32 will have an angle according to the rotation angle of the valve core 29. According to the size of the angle, the cross-sectional area of the flow channel formed by the two is different. When the hydraulic oil flows through the channel, it will be subject to different degrees of damping. Therefore, by changing the rotation angle of the valve core 29, the damping of the hydraulic oil can be adjusted. The damping will also act on the magnetized plunger 33, which can apply a certain amount of damping to the lateral vibration of the drill rod 4, and the damping size can be adjusted according to demand.

[0042] The lateral vibration generated by the drill rod 4 during drilling will be partially offset by the hydraulic damping, and the rest will be absorbed by the spring 34, preventing the drill rod 4 from being subjected to the reaction force from the rock and transmitted to the core drilling rig. The damping size can be adjusted by changing the rotation angle of the valve core 29, thereby being able to control the vibration amplitude of the drill rod 4 to a certain extent, thereby reducing the deviation amplitude of the drill rod 4.

[0043] Combined with attachment Figure 7 An outer mounting groove 21 matching the outer contour of the damping valve 19 is provided at the connection between the inner ring connecting hole 22 of the liquid storage ring 17 and the hydraulic cylinder 24, and an inner mounting groove 23 matching the outer contour of the damping valve 19 is provided at the connection between the outer ring hydraulic cylinder 24 and the connecting hole 22 of the shock absorbing ring 16. The damping valve 19 is nested in the outer mounting groove 21 and the inner mounting groove 23.

[0044] By embedding and installing the damping valve 19 between the liquid storage ring 17 and the shock absorbing ring 16 , the liquid storage ring 17 and the shock absorbing ring 16 can be prevented from rotating, thereby preventing the connecting hole 22 and the hydraulic cylinder 24 from being misaligned.

[0045] Combined with attachment Figure 12 , Attachment Figure 13 and attached Figure 14 A gear ring 36 is rotatably provided inside the annular transmission box 11. A plurality of planetary gears 38 are rotated in the inner ring of the bottom of the annular transmission box 11. An input gear 37 is rotatably provided on the outer side of the top. An outer gear ring 39 is provided on the top of the gear ring 36 to mesh with the input gear 37. An inner gear ring 40 is provided on the bottom to mesh with the planetary gears 38. A transmission rod 30 is provided on the top of the valve core 29. A plurality of third through holes 41 are provided at the bottom of the annular transmission box 11. The transmission rod 30 passes through the third through holes 41 and is power-connected to the planetary gears 38. A motor 42 is provided on the outside of the annular transmission box 11. The output end of the motor 42 is power-connected to the input gear 37.

[0046] By controlling the motor 42 to drive the input gear 37 to drive the gear ring 36 to rotate, the planetary gears 38 can be rotated synchronously, and the rotation of multiple valve cores 29 can be controlled simultaneously to adjust the damping that the shock absorbing assembly 10 can provide.

[0047] Combined with attachment Figure 7 and attached Figure 10 A lower mounting groove 25 is provided below the shock absorbing ring 16 and is nested in the outer ring of the hydraulic cylinder 24 , and a Hall sensor 26 is provided in the mounting groove 25 .

[0048] Since the magnetized plunger 33 has been magnetized, it has a certain magnetic field. When the magnetized plunger 33 moves in the hydraulic cylinder 24, the Hall sensor 26 can sense the movement state of the magnetized plunger 33 through the transformation of the magnetic field. Since the hydraulic oil pressure and the spring 34 always apply pressure and elastic force to the magnetized plunger 33 to press the ball 18 against the drill rod 4, the lateral vibration of the magnetized plunger 33 and the drill rod 4 are kept synchronized. By sensing the movement state of the magnetized plunger 33 through the Hall sensor 26, the magnitude of the vibration direction of the drill rod 4 can be detected in real time. Then, according to the magnitude of the vibration direction of the drill rod 4, the motor 42 can be controlled in real time to dynamically adjust the damping size to absorb the vibration amplitude of the drill rod 4 within a controllable range.

[0049] The PLC or other types of control computer hardware and software required to control the motor 42 according to the data of the Hall sensor 26 belong to the mature existing technology and will not be further described in this application.

[0050] Combined with attachment Figure 2 and attached Figure 3 The support plate 9 is provided with multiple inner slots 12 around the periphery, and the outer ring of the shock-absorbing assembly 10 and the annular transmission box 11 is provided with multiple positioning clips 13 that match the inner slots 12. The positioning clips 13 slide vertically into the inner slots 12 for limiting. The mounting bracket 5 is provided with outer slots 7 that match the inner slots 12. The inner slots 12 slide vertically into the outer slots 7 for limiting. Through the above-mentioned installation method, the annular shock-absorbing assembly 10 and the annular transmission box 11 can be firmly mounted on the support plate 9 to form a limit assembly 6. The number of limit assemblies 6 installed on the mounting bracket 5 can also be adjusted according to actual needs. Increasing the number of limit assemblies 6 can improve the shock-absorbing effect of the drill rod 4, which can be suitable for drilling deeper and longer drill rods 4.

[0051] The above description of the present invention and its embodiments is non-limiting, and the actual structure is not limited thereto. In short, if a person skilled in the art is inspired by the above, and does not deviate from the purpose of the invention, without creatively designing a structure and embodiment similar to the technical solution, they shall fall within the scope of protection of the present invention.

Claims

1. A drilling anti-deviation device for core drilling, comprising a lifting guide rail (1), a lifting platform (2), a hydraulic motor (3) and a drill rod (4), wherein the lifting platform (2) is slidably arranged on the lifting guide rail (1), the lifting platform (2) is provided with a hydraulic motor (3), the hydraulic motor (3) drives the drill rod (4), a mounting bracket (5) is provided at the bottom of the lifting guide rail (1), a plurality of annular limit assemblies (6) are stacked on the mounting bracket (5), and the drill rod (4) passes through the limit assemblies (6) for drilling, characterized in that: The limit assembly (6) is composed of a support plate (9), a shock absorbing assembly (10) and an annular transmission box (11) stacked in sequence from bottom to top, wherein the shock absorbing assembly (10) is composed of a wear-resistant ring (15), a shock absorbing ring (16) and a liquid storage ring (17) nested in sequence from inside to outside, and a plurality of hydraulic cylinders (24) pointing to the center of the shock absorbing ring (16) are arranged around the shock absorbing ring (16), a magnetized plunger (33) is slidably arranged in the hydraulic cylinder (24), and a ball (18) is slidably arranged at the outer end of the magnetized plunger (33). ), a spring (34) is provided in the hydraulic cylinder (24) to push the plunger (33) and the ball (18) toward the center of the shock-absorbing ring (16), an annular liquid storage cavity (35) is provided in the liquid storage ring (17), and a plurality of connecting holes (22) are provided on the inner ring of the liquid storage ring (17) to connect the hydraulic cylinder (24) with the liquid storage cavity (35), and hydraulic oil is provided to the liquid storage cavity (35) and the hydraulic cylinder (24) by an external hydraulic pump station, and a damping valve (19) with adjustable flow is provided between the hydraulic cylinder (24) and the connecting hole (22).

2. The core drilling anti-deviation device according to claim 1, characterized in that: A valve core (29) is rotatably provided inside the damping valve (19), first damping holes (31) are provided on both sides of the damping valve (19) and are respectively communicated with the connecting hole (22) and the hydraulic cylinder (24), and the valve core (29) is provided with a through second damping hole (32).

3. The core drilling anti-deviation device according to claim 2, characterized in that: An outer mounting groove (21) matching the outer contour of the damping valve (19) is provided at the connection between the inner ring connecting hole (22) of the liquid storage ring (17) and the hydraulic cylinder (24), and an inner mounting groove (23) matching the outer contour of the damping valve (19) is provided at the connection between the outer ring hydraulic cylinder (24) of the shock absorbing ring (16) and the connecting hole (22). The damping valve (19) is nested and installed in the outer mounting groove (21) and the inner mounting groove (23).

4. The core drilling anti-deviation device according to claim 2, characterized in that: A gear ring (36) is provided in rotation in the annular transmission box (11), a plurality of planetary gears (38) are provided on the inner ring of the bottom of the annular transmission box (11) for rotation, an input gear (37) is provided on the outer ring of the top for rotation, an outer gear ring (39) is provided on the top of the gear ring (36) for meshing with the input gear (37), an inner gear ring (40) is provided on the bottom for meshing with the planetary gears (38), a transmission rod (30) is provided on the top of the valve core (29), a plurality of third through holes (41) are provided on the bottom of the annular transmission box (11), and the transmission rod (30) passes through the third through holes (41) for power connection with the planetary gears (38).

5. The core drilling anti-deviation device according to claim 4, characterized in that: A motor (42) is arranged outside the annular transmission box (11), and an output end of the motor (42) is connected to the input gear (37) in a power manner.

6. The core drilling anti-deviation device according to claim 1, characterized in that: A lower mounting groove (25) is provided below the shock absorbing ring (16) and is nested in the outer ring of the hydraulic cylinder (24). A Hall sensor (26) is provided in the mounting groove (25).

7. The core drilling anti-deviation device according to claim 1, characterized in that: A plurality of limiting holes (27) for matching the balls (18) are provided around the wear-resistant ring (15).

8. The core drilling anti-deviation device according to claim 1, characterized in that: The support plate (9) is provided with a plurality of inner slots (12) around its periphery, and the outer ring of the shock absorbing component (10) and the annular transmission box (11) is provided with a plurality of positioning latches (13) matching the inner slots (12) around its periphery, and the positioning latches (13) vertically slide into the inner slots (12) for positioning.

9. The core drilling anti-deviation device according to claim 8, characterized in that: An outer card slot (7) matching the inner card slot (12) is provided on the mounting bracket (5), and the inner card slot (12) slides vertically into the outer card slot (7) for positioning.

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