A drill bit for pre-burying a pole

Abstract

The utility model discloses a drill bit for pole pre-burying drilling belongs to the technical field of drilling drill bit, at present, drilling exists precision, soil accumulation etc.

Description

Technical Field

[0001] This invention relates to the field of drilling bit technology, and in particular to a drill bit for pre-embedded drilling of utility poles. Background Technology

[0002] In plains areas, utility poles are mainly used to support the weight of conductors, insulators, hardware, etc. This is done by manually or mechanically digging pits at the pole installation points beforehand, then pre-burying the bottom of the pole in the pits or holes. The pole is then reinforced by directly backfilling and compacting the excavated soil or by pouring concrete. However, after prolonged use, soil backfilling and compaction can easily lead to soil loosening. Combined with the vibrations and lateral tension from overhead power lines, this makes the pole prone to tilting. Concrete reinforcement, where the concrete is integrated with the pole's bottom and roughly columnar, can also develop gaps and tilting under the lateral tension of the power lines over time, posing a potential hazard to power transmission.

[0003] Manual hole digging has been gradually replaced by post hole diggers. Post hole diggers mainly consist of a mobile platform equipped with an auger drill bit. The mobile platform includes a moving base, articulated frame, hydraulic system, and drive mechanism. The auger drill bit is controlled by the mobile platform to drill into the soil. During this process, the excavated soil is lifted by the auger and thrown around the hole, eventually forming a cylindrical hole. This method of hole formation is prone to hole tilting during drilling because the auger drill bit lacks a stabilizing structure and is only controlled by the articulated frame. At the same time, the excavated soil piled up around the top of the cylindrical hole is prone to hole collapse after the auger drill bit is withdrawn, and the piled-up distance is too close, which affects subsequent operations.

[0004] Based on the above systematic analysis and summary of the existing methods for pre-embedding utility poles, mainly the hole-forming methods and the problems existing in the use of hole-forming equipment, a new drill bit for pre-embedding utility poles is proposed, which can meet the needs of diverse hole-forming and overcome the defects of existing auger drill bits in use. Summary of the Invention

[0005] The purpose of this invention is to solve the problems of traditional cylindrical hole pre-embedded utility poles and auger drill bits during use, such as the drilling axis being prone to tilting and the drilled soil accumulating around the top of the hole. Therefore, this invention proposes a drill bit for pre-embedded utility pole drilling.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A drill bit for pre-embedded drilling of utility poles, fitted to the output end of a drive mechanism included in a mobile platform, includes a drill bit body, which includes a rotary drilling shaft, two spirals wound around the rotary drilling shaft, and cutter heads fitted at the bottom of the spirals. Two positioning rings are fixedly fitted on the outer sides of the two spirals near the bottom of the rotary drilling shaft. Two radially extending arc-shaped plates are connected to the top of the rotary drilling shaft. The drill bit also includes: two side-expanding rotary drilling components rotatably fitted between the two positioning rings; a cylinder frame fitted on the outer sides of the two spirals between the upper positioning ring and the arc-shaped plate; a locking member fitted on the top of the cylinder frame to control the relative deflection angle between the cylinder frame and the drill bit body; when deflected relative to the drill bit body, the cylinder frame can drive the free ends of the two side-expanding rotary drilling components to deflect and expand radially outward towards the drill bit body; and a positioning and lifting assembly, which includes a slag discharge part axially slidably fitted on the cylinder frame and a positioning part rotatably connected to the slag discharge part and positioned outside the borehole opening.

[0007] In light of the drawbacks of existing auger drill bits and the cylindrical shape of the holes they create, whether for soil backfilling and compaction or concrete backfilling, the drill bit proposed in this invention should possess at least the following functions: Firstly, from the perspective of the drill bit itself, it should be able to meet the requirements for hole enlargement, meaning that during the drilling process, the lower end of the hole has a larger diameter than the upper end. The advantage of this function is that after subsequent concrete backfilling, the soil above the large-diameter hole can form a natural cover, making the lower end of the utility pole more securely embedded in the concrete and effectively resisting the lateral tension of the power line. In addition to external impact, the specific implementation method is to control the relative deflection angle between the cylinder frame and the drill bit body by utilizing the resistance of the hole sidewall to the cylinder frame during rotary drilling and the contact point between the arc plate and the locking piece relative to the circumferential point of the cylinder frame. That is, by controlling the size of the relative deflection angle, the coverage area of ​​the free ends of the two side-expanding rotary drilling parts deflected and expanded radially outward towards the drill bit body is controlled. This can be understood as the size of the hole bottom diameter expansion. At the same time, the joint between the upper and lower cylindrical holes is frustoconical, which facilitates concrete flow and leveling and avoids the formation of cavities that hinder concrete pouring.

[0008] The positioning and lifting assembly is slidably mounted on the cylinder frame. During the initial rotary drilling process, when the side-expanding rotary drilling component enters the ground and is not deployed, the positioning part will be stuck on the top outer periphery of the hole. As the rotary drilling continues to advance downward, the positioning part can ensure that the deviation angle error of the axis of the cylinder frame moving downward is small through the rotating slag discharge part, that is, ensure the accuracy of the rotary drilling. On the other hand, the slag discharge part can rotate with the cylinder frame and lift the two spiral bodies to throw the soil debris discharged through the cylinder frame outward, avoiding accumulation at the hole opening.

[0009] As a further description of the above technical solution: The inner circumference of the positioning ring is symmetrically provided with protrusions, and a side-expanding rotary drilling component is rotatably installed between the protrusions on the two positioning rings. The side-expanding rotary drilling component includes an arc-shaped rotary drilling cutter. The rotating end of the rotary drilling cutter is rotatably installed between the two protrusions via a rotating shaft. The outer edge of the spiral body is provided with a relief groove that fits with the rotating shaft and a notch that provides partial support to the rotating end of the rotary drilling cutter when the maximum rotation angle is reached. At the same time, the top of the rotating shaft passes through a protrusion located above and is connected to a gear.

[0010] As a further description of the above technical solution: The width of the rotary drilling cutter decreases along the axial direction of the rotary drilling shaft from the rotating end to the free end.

[0011] As a further description of the above technical solution: The inner wall of the tube frame rotates and fits into the outer edge of the spiral body. Two arc-shaped racks are installed at the bottom of the tube frame through an annular groove, and the arc-shaped racks mesh with gears.

[0012] As a further description of the above technical solution: The side wall of the cylinder frame is provided with several slag discharge ports, and the top of the cylinder frame is provided with a scale. At the same time, the outer periphery of the top of the cylinder frame is provided with locking teeth, and the locking element is fitted on the top of the cylinder frame and cooperates with the locking teeth.

[0013] As a further description of the above technical solution: The locking component includes a locking ring, with a stop extending from the top of the locking ring towards the top of the barrel frame. During rotary drilling, one side of the stop abuts against the front side of the arc-shaped plate along the rotation direction. An arc-shaped locking bar is rotatably installed below the locking ring through a notch. The rotating end of the locking bar is installed on the locking ring by bolts, and the locking bar engages with the locking teeth.

[0014] As a further description of the above technical solution: The side wall of the cylinder frame is also provided with at least two slide rail grooves. The slag discharge section includes a lifting ring that is slidably sleeved on the outside of the cylinder frame. The inner circumference of the lifting ring is provided with a guide rail that is inserted into the slide rail groove. The lifting ring is also provided with an arc-shaped plate corresponding to the slag discharge port.

[0015] As a further description of the above technical solution: The positioning part includes a second positioning ring. The top of the second positioning ring is rotatably connected to the bottom of the lifting ring via a connector with a transition groove. The bottom surface of the second positioning ring is also provided with several pins.

[0016] As a further description of the above technical solution: The first and second arc-shaped plates are arc-shaped extending radially outward along the rotary drilling shaft, and the lower side inlet of the first arc-shaped plate is smoothly connected to the top of the auger.

[0017] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: By utilizing the resistance of the borehole sidewall to the cylinder frame during rotary drilling and the circumferential position of the contact point between the arc plate and the locking piece relative to the cylinder frame, the relative deflection angle between the cylinder frame and the drill bit body is controlled. In other words, by controlling the magnitude of the relative deflection angle, the coverage area of ​​the free ends of the two side-expanding rotary drilling components deflected and expanded radially outward towards the drill bit body can be understood as the size of the borehole bottom diameter expansion. At the same time, the joint between the upper and lower cylindrical holes is frustoconical, which facilitates concrete flow and leveling and avoids the formation of cavities that hinder concrete pouring.

[0018] The positioning and lifting assembly is slidably mounted on the cylinder frame. During the initial rotary drilling process, when the side-expanding rotary drilling component enters the ground and is not deployed, the positioning part will be stuck on the top outer periphery of the hole. As the rotary drilling continues to advance downward, the positioning part can ensure that the deviation angle error of the axis of the cylinder frame moving downward is small through the rotating slag discharge part, that is, ensure the accuracy of the rotary drilling. On the other hand, the slag discharge part can rotate with the cylinder frame and lift the two spiral bodies to throw the soil debris discharged through the cylinder frame outward, avoiding accumulation at the hole opening. Attached Figure Description

[0019] Figure 1 A three-dimensional drill bit according to an embodiment of the present invention is shown. Figure 1 ; Figure 2 A three-dimensional drill bit according to an embodiment of the present invention is shown. Figure 2 ; Figure 3 A perspective view of the drill bit reaming state provided according to an embodiment of the present invention is shown; Figure 4 A perspective view of the gantry, locking element, and positioning follower assembly provided according to an embodiment of the present invention being detached from the drill bit body is shown. Figure 5 A perspective view of the locking member and the positioning and lifting assembly provided according to an embodiment of the present invention being removed from the cylinder frame is shown; Figure 6 A bottom view of the gantry provided according to an embodiment of the present invention is shown; Figure 7 A perspective view of the drill bit body and two side-spreading rotary drilling components disassembled according to an embodiment of the present invention is shown. Figure 8 A schematic diagram of rotary drilling provided according to an embodiment of the present invention is shown.

[0020] Legend: 10. Drill bit body; 11. Rotary drilling shaft; 12. Spiral; 121. Relief groove; 122. Notch; 13. Cutting head; 14. Arc plate one; 15. Positioning ring one; 151. Protrusion; 20. Side-spreading rotary drilling component; 21. Rotary drilling cutter; 22. Gear; 30. Cylinder frame; 31. Dial; 32. Slag discharge port; 33. Locking teeth; 34. Annular groove; 35. Arc-shaped rack; 36. Slide rail groove; 40. Locking component; 41. Locking ring; 42. Stop block; 43. Lock bar; 50. Positioning and lifting assembly; 51. Lifting ring; 52. Guide rail; 53. Arc plate II; 54. Positioning ring II; 541. Pin. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] To address the problems associated with traditional cylindrical holes and cylindrical hole drilling bits, such as... Figure 1-8 As shown, the present invention proposes a drill bit for pre-embedded drilling of utility poles, which is fitted to the output end of the drive mechanism of the mobile platform. The drill bit body 10 includes a rotary drilling shaft 11, two spiral bodies 12 wound on the rotary drilling shaft 11, and a cutter head 13 fitted at the bottom end of the spiral bodies 12. The rotary drilling shaft 11 is connected to the output end of the drive mechanism through a coupling. The two spiral bodies 12 are welded to the surface of the rotary drilling shaft 11. The cutter head 13 is a conventional rotary drilling cutter head. Two positioning rings 15 are fixedly fitted on the outer sides of the two spiral bodies 12 near the bottom end of the rotary drilling shaft 11. The positioning rings 15 are welded to the spiral bodies 12. The inner circumference of the positioning rings 15 is symmetrically provided with protrusions 151. The side-spreading rotary drilling component 20 is rotatably installed between the protrusions 151 on the two positioning rings 15. The side-spreading rotary drilling component 20 includes an arc-shaped rotary drilling cutter 21. The rotating end of the rotary drilling cutter 21 is rotatably installed between the two protrusions 151 through the shaft. The outer edge of the spiral body 12 is provided with a relief groove 121 that fits with the shaft and a notch 122 that partially supports the rotating end of the rotary drilling cutter 21 when the maximum rotation angle is reached. At the same time, the top of the shaft passes through a protrusion 151 located above and is connected to a gear 22. The top of the rotary drilling shaft 11 is connected to two radially extending arc-shaped plates 14. The drill bit also includes: a cylindrical frame 30 fitted between a positioning ring 15 and an arc-shaped plate 14 on the upper part, and two spiral bodies 12 on the outside of the cylindrical frame 30. The inner wall of the cylindrical frame 30 rotates and fits against the outer edge of the spiral body 12. Two arc-shaped racks 35 are installed at the bottom of the cylindrical frame 30 through an annular groove 34. The arc-shaped racks 35 mesh with gears 22. That is, by controlling the relative rotation angle between the cylindrical frame 30 and the drill bit body 10, the rotary cutting cutter 21 can be controlled to extend outward to achieve the purpose of diameter expansion. The top of the cylindrical frame 30 is equipped with a locking member 40 to control the relative deflection angle between it and the drill bit body 10. When deflecting relative to the drill bit body 10, the cylindrical frame 30 can drive the free ends of the two side-extension rotary cutting members 20 to deflect and extend radially outward towards the drill bit body 10. The maximum relative deflection angle is controlled by the locking member 40. During rotary drilling, the resistance of the inner wall of the hole to the cylinder 30 and the rotary rotation drive of the drill bit body 10 control the relative deflection. During the deflection, the arc rack 35 drives the gear 22 to rotate, and the gear 22 drives the rotary cutting cutter 21 to rotate. The free end of the rotary cutting cutter 21 extends outward. Since the rotary cutting cutter 21 is concave towards the rotary drilling direction, during the rotary drilling process, the rotary cutting cutter 21 will also roll the broken soil into the spiral body 12 and throw it out after being lifted by the spiral body 12. By controlling the size of the relative deflection angle, the coverage area of ​​the free ends of the two rotary cutting cutters 21 deflected outward in the radial direction of the drill bit body can be controlled. This can be understood as the size of the diameter expansion at the bottom of the hole. At the same time, the joint between the upper cylindrical hole and the lower cylindrical hole is truncated cone-shaped, which facilitates the flow and leveling of concrete and avoids the formation of concave cavities that hinder the pouring of concrete. A positioning and lifting assembly 50 is also provided. The positioning and lifting assembly 50 includes a slag discharge part that is axially slidably sleeved on the cylinder frame 30 and a positioning part that is rotatably connected to the slag discharge part and positioned outside the borehole opening. Through the fault-tolerant cooperation of the positioning part and the slag discharge part, during the initial rotary drilling process, when the side-expanding rotary drilling component 20 enters the ground along with the cutter head 13 and is not unfolded, the positioning part will be stuck on the top outer periphery of the hole. As the rotary drilling continues to advance downward, the positioning part can ensure that the deviation angle error of the axis of the cylinder frame moving downward is small through the rotatably connected slag discharge part, that is, to ensure the accuracy of the rotary drilling. On the other hand, the slag discharge part can rotate with the cylinder frame and lift the two spiral bodies and throw the soil debris discharged through the cylinder frame outward to avoid accumulation at the borehole opening.

[0023] like Figure 3 , Figure 7 As shown, in order to reduce the resistance when the rotary drilling cutter 21 extends outward, the width of the rotary drilling cutter 21 along the axial direction of the rotary drilling shaft 11 from the rotating end to the free end is deliberately reduced, that is, the free end of the rotary drilling cutter 21 is a sharp end, and the resistance when it extends outward laterally is smaller.

[0024] For further details, such as Figures 1-6As shown, in order to enable the soil to be thrown out when it is lifted by the spiral 12 to a height above the ground, the side wall of the cylinder frame 30 is provided with several slag discharge ports 32. After the spiral 12 lifts the soil, the soil is discharged through the slag discharge ports 32 under the action of continuous centrifugal force.

[0025] like Figures 1-6 As shown, in order to control the relative deflection angle between the barrel frame 30 and the drill bit body 10, a dial 31 is provided at the top of the barrel frame 30, and a locking tooth 33 is provided on the outer periphery of the top of the barrel frame 30. A locking member 40 is fitted on the top of the barrel frame 30 and cooperates with the locking tooth 33. The locking member 40 includes a locking ring 41, and a stop 42 is provided on the top of the locking ring 41 extending towards the top of the barrel frame 30. During rotary drilling, one side of the stop 42 abuts against the front side of the arc plate 14 in the direction of rotation. An arc-shaped locking bar 43 is rotatably installed below the locking ring 41 through a notch. The rotating end of the locking bar 43 is installed on the locking ring 41 by bolts, and the locking bar 43 and the locking tooth 31 are connected. 3. With proper coordination, loosening the bolts allows for free control of the position of the stop block 42 at the top of the cylinder frame 30. This adjustment step is performed after the small-diameter hole above has been completed and the machine has been stopped for adjustment. That is, after the drill bit body 10 rotates, the cylinder frame 30 deflects relative to the drill bit body 10 under the resistance of the inner wall of the hole. During this process, the rotary cutting blade 21 extends outward. After a specified angle, the arc plate 14 abuts against the stop block 42 on the front side along the rotation direction. At this time, the outward extension radius of the rotary cutting blade 21 is fixed, and the cylinder frame 30 can rotate synchronously with the drill bit body 10. When resetting, controlling the drill bit body 10 to rotate in the opposite direction can retract the rotary cutting blade 21, making it easy for the drill bit to exit.

[0026] like Figures 3-7 As shown, to ensure the axial accuracy of the borehole and avoid oblique holes, the side wall of the cylinder frame 30 is provided with at least two slide rail grooves 36. The slag discharge part includes a lifting ring 51 that is slidably sleeved on the outside of the cylinder frame 30. The inner circumferential surface of the lifting ring 51 is provided with a guide rail 52 that is inserted into the slide rail groove 36. By setting the guide rail 52 and the slide rail groove 36, it is ensured that the lifting ring 51 can slide relative to the axial direction while rotating with the cylinder frame 30. The lifting ring 51 is also provided with an arc-shaped plate 53 corresponding to the slag discharge port 32. The rotation of the lifting ring 51 can accelerate the throwing out of the soil that has passed through the slag discharge port 32, avoiding accumulation at the hole opening. The positioning part includes a positioning ring 54. The top of the positioning ring 54 is rotatably connected to the bottom of the lifting ring 51 through a converter with a transition groove. The bottom surface of the positioning ring 54 is also provided with several pins 541 to control the stability of the axis of the cylinder frame 30 during the lifting process, ensuring the drilling accuracy and avoiding the situation of hole collapse caused by collision with the inner wall of the hole when withdrawing the hole.

[0027] To dislodge the soil excavated by rotary drilling, the first arc plate 14 and the second arc plate 53 are generally arc-shaped extending radially outward along the rotary drilling shaft 11. They can dislodge the soil that comes out through the slag discharge port 32 or the top port. At the same time, the low-position side inlet of the first arc plate 14 is smoothly connected to the top of the spiral body 12, specifically by welding and grinding.

[0028] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A drill bit for pre-embedded drilling of utility poles, fitted to the output end of a drive mechanism included in a mobile platform, comprising a drill bit body (10), the drill bit body (10) including a rotary drilling shaft (11), two spiral bodies (12) wound around the rotary drilling shaft (11), and a cutter head (13) fitted at the bottom end of the spiral bodies (12), characterized in that, Two positioning rings (15) are fixedly fitted on the outer side of the two spiral bodies (12) near the bottom of the rotary drilling shaft (11), and two radially extending arc plates (14) are connected to the top of the rotary drilling shaft (11). The drill bit also includes: Rotate the two side-spreading rotary digging parts (20) mounted between the two positioning rings (15), and the cylinder frame (30) sleeved on the outside of the two spiral bodies (12) between the upper positioning ring (15) and the arc plate (14). The top of the cylinder frame (30) is equipped with a locking piece (40) to control the relative deflection angle between it and the drill body (10). When deflected relative to each other, the cylinder frame (30) can drive the free ends of the two side-spreading rotary digging parts (20) to deflect and unfold radially outward towards the drill body (10). And a positioning lifting assembly (50), the positioning lifting assembly (50) includes a slag discharge part that is axially slidably sleeved on the cylinder frame (30) and a positioning part that is rotatably connected to the slag discharge part and positioned outside the borehole opening; The inner circumference of the positioning ring (15) is symmetrically provided with protrusions (151), and the side-spreading rotary drilling component (20) is rotatably installed between the protrusions (151) on the two positioning rings (15). The side-spreading rotary drilling component (20) includes an arc-shaped rotary drilling cutter (21). The rotating end of the rotary drilling cutter (21) is rotatably installed between the two protrusions (151) through a rotating shaft. The top end of the rotating shaft passes through one of the upper protrusions (151) and is connected to a gear (22). The inner wall of the cylinder frame (30) is rotatably fitted with the outer edge of the spiral body (12). The bottom end of the cylinder frame (30) is provided with an annular groove (34) to install two arc-shaped racks (35). The arc-shaped racks (35) mesh with the gears (22).

2. The drill bit for pre-embedded drilling of utility poles according to claim 1, characterized in that, The outer edge of the spiral (12) is provided with a relief groove (121) that fits with the rotating shaft and a notch (122) that partially supports the rotating end of the rotary drilling cutter (21) when the maximum rotation angle is reached.

3. The drill bit for pre-embedded drilling of utility poles according to claim 2, characterized in that, The width of the rotary drilling cutter (21) decreases from the rotating end to the free end along the axial direction of the rotary drilling shaft (11).

4. The drill bit for pre-embedded drilling of utility poles according to claim 1, characterized in that, The side wall of the cylinder frame (30) is provided with several slag discharge ports (32), the top of the cylinder frame (30) is provided with a dial (31), and the outer periphery of the top of the cylinder frame (30) is provided with locking teeth (33). The locking piece (40) is fitted on the top of the cylinder frame (30) and cooperates with the locking teeth (33).

5. A drill bit for pre-embedded drilling of utility poles according to claim 4, characterized in that, The locking component (40) includes a locking ring (41). The top of the locking ring (41) extends toward the top of the cylinder frame (30) and is provided with a stop (42). During rotary drilling, one side of the stop (42) abuts against the front side of the arc plate (14) in the direction of rotation. The locking ring (41) is provided with a notch below to rotate and install an arc-shaped locking bar (43). The rotating end of the locking bar (43) is installed on the locking ring (41) by bolts, and the locking bar (43) cooperates with the locking teeth (33).

6. A drill bit for pre-embedded drilling of utility poles according to claim 5, characterized in that, The side wall of the cylinder frame (30) is also provided with at least two slide rail grooves (36). The slag discharge part includes a lifting ring (51) that is slidably sleeved on the outside of the cylinder frame (30). The inner circumferential surface of the lifting ring (51) is provided with a guide rail (52) inserted into the slide rail groove (36). The lifting ring (51) is also provided with an arc plate (53) corresponding to the slag discharge port (32).

7. A drill bit for pre-embedded drilling of utility poles according to claim 6, characterized in that, The positioning part includes a second positioning ring (54). The top of the second positioning ring (54) is rotatably connected to the bottom of the lifting ring (51) through a converter with a transition groove. The bottom surface of the second positioning ring (54) is also provided with a number of pins (541).

8. A drill bit for pre-embedded drilling of utility poles according to claim 7, characterized in that, The first arc plate (14) and the second arc plate (53) are arc-shaped extending radially outward along the rotary drilling shaft (11), and the low-side inlet of the first arc plate (14) is smoothly connected to the top of the spiral body (12).

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