Rotary drilling bit for loose rock stratum geological trepanning

Abstract

The utility model provides a rotary drilling bit for loose rock stratum geological trepanning, and belongs to the technical field of pile foundation construction equipment. Comprising a drill cylinder and a square head, a plurality of cutting picks are distributed at the bottom of the drill cylinder, and a top plate is fixed to the top of the drill cylinder; a notch is formed in the side wall of the drilling cylinder, a door plate corresponding to the notch is hinged to the side wall of the drilling cylinder, and the door plate can close the notch. A hinge seat is fixed to the middle of the inner side of the door plate, a connecting rod is hinged to the hinge seat, and a driving rod is hinged to the connecting rod. The square head is located above the top plate, a limiting disc is fixed to the bottom of the square head, and through holes allowing the driving rod to penetrate through are formed in the top plate and the limiting disc; a limiting plate is fixed to the top of the driving rod and located in the square head. A plurality of hanging lugs are fixed to the upper surface of the top plate, and a plurality of hanging teeth corresponding to the hanging lugs are arranged on the peripheral face of the limiting disc. The rotary drilling machine is suitable for rotary drilling operation of loose rock stratum geology, and the operation efficiency is high.

Description

Technical Field

[0001] The utility model belongs to the technical field of pile foundation construction equipment and relates to a rotary drilling bit for drilling holes in loose rock strata. Background Art

[0002] A rotary drilling rig is a construction machine suitable for drilling holes in foundation engineering. It is widely used in municipal construction, highway bridges, high-rise buildings, and other foundation construction projects. It boasts high installed power, high output torque, high axial pressure, maneuverability, and high construction efficiency. The rotary drilling rig outputs torque and pressure through the power unit, which are ultimately transmitted to the drill bit. Therefore, the drill bit is a crucial component in determining the rotary drilling rig's ability to adapt to complex strata and improve work efficiency.

[0003] In existing technologies, when drilling holes in loose rock formations, either a barrel drill is used first, followed by a bailer to clean the hole. This method is inefficient and prolongs the construction period of pile foundations. Alternatively, a bailer with picks on its bottom plate is used for direct excavation. However, this method significantly disturbs the rock formation, as the picks constantly push the accumulated rock upward, making the geology around the pile hole even looser. The surface of the rotary pile excavation hole cannot stabilize, resulting in repeated hole collapse, making it difficult to ensure pile quality, and leading to construction delays and increased costs. Utility Model Content

[0004] The purpose of this utility model is to solve the above problems in the existing technology and provide

[0005] The invention discloses a rotary drilling bit for drilling a hole in a loose rock formation. The rotary drilling bit has little disturbance to the surrounding rock formations during drilling and can perform hole cleaning operations while drilling.

[0006] The purpose of the utility model can be achieved through the following technical solutions: A rotary drilling drill bit for opening holes in loose rock formations, characterized in that the drill bit comprises a drill barrel and a square head, a plurality of cutting teeth are distributed at the bottom of the drill barrel, and a top plate is fixed on the top of the drill barrel; a notch is opened on the side wall of the drill barrel, and a door panel corresponding to the notch is hinged on the side wall of the drill barrel, and the door panel can close the notch; a hinge seat is fixed at the middle position of the inner side of the door panel, a connecting rod is hinged on the hinge seat, and a driving rod is hinged on the connecting rod; the square head is located above the top plate, a limit plate is fixed on the bottom of the square head, and a through hole for the driving rod to pass through is opened on the top plate and the limit plate; a limit plate is fixed on the top of the driving rod, and the limit plate is located in the square head; a plurality of hanging ears are fixed on the upper surface of the top plate, and a plurality of hanging teeth corresponding to each hanging ear are provided on the outer circumference of the limit plate; a slide groove is provided on each of the hanging ears, each slide groove includes a vertical section and a horizontal section, and one surface of each hanging ear is in close contact with the outer circumference of the limit plate.

[0007] Preferably, a plurality of limiting teeth are welded on a surface of the door panel close to the interior of the drill tube, and each limiting tooth extends downward to the outside of the door panel.

[0008] The utility model has the advantages:

[0009] The rotary drilling drill bit has an overall cylindrical drill structure, which can reduce the disturbance to the rock formation around the rotary drilling hole, thereby avoiding repeated collapse due to loosening. At the same time, it has a slag cleaning function that the cylindrical drill in the existing technology does not have, making it suitable for rotary drilling operations in loose rock formations, and the rotary drilling efficiency is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the three-dimensional structure of the rotary drilling drill bit.

[0011] Figure 2 It is a front structural schematic diagram of the rotary drilling drill bit.

[0012] Figure 3 yes Figure 2 Schematic diagram of the cross-sectional structure at AA in the middle.

[0013] In the figure, 1. drill barrel; 11. top plate; 12. notch; 2. square head; 21. limit plate; 22. hanging tooth; 3. pick; 4. door panel; 41. hinge seat; 42. limit tooth; 5. connecting rod; 6. driving rod; 61. limit plate; 7. hanging ear; 71. vertical section; 72. horizontal section. DETAILED DESCRIPTION

[0014] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0015] like Figure 1 、 Figure 2 and Figure 3As shown, a rotary drilling bit for drilling in loose rock formations comprises a drill barrel 1 and a square head 2. A plurality of cutting teeth 3 are distributed at the bottom of the drill barrel 1, and a top plate 11 is fixed to the top of the drill barrel 1. A notch 12 is opened on the side wall of the drill barrel 1, and a door panel 4 corresponding to the notch 12 is hinged on the side wall of the drill barrel 1, and the door panel 4 can close the notch 12. A hinge seat 41 is fixed at the middle position of the inner side of the door panel 4, and a connecting rod 5 is hinged on the hinge seat 41, and a driving rod 6 is hinged on the connecting rod 5. The square head 2 is located above the top plate 11. A limit plate 21 is fixed to the bottom of the square head 2, and through holes are provided on the top plate 11 and the limit plate 21 for the driving rod 6 to pass through; a limit plate 61 is fixed to the top of the driving rod 6, and the limit plate 61 is located inside the square head 2; a number of hanging ears 7 are fixed to the upper surface of the top plate 11, and a number of hanging teeth 22 corresponding to each hanging ear 7 are provided on the outer peripheral surface of the limit plate 21; a slide groove is provided on each hanging ear 7, and each slide groove includes a vertical section 71 and a horizontal section 72, and one surface of each hanging ear 7 is in close contact with the outer peripheral surface of the limit plate 21.

[0016] Working principle:

[0017] 1. Drill Bit Installation: When this rotary drill bit is placed vertically on the ground, gravity forces the square head 2 and drive rod 6 to their lowest position. The stop plate 61 is located at the inner bottom of the square head 2. The drill rod can be directly inserted into the square head 2 to complete the drill bit installation. When the square head 2 and the drill rod are fixed together, the bottom of the drill rod just touches the stop plate 61, allowing the drill rod to drive the drive rod 6 to slide up and down within the drill bit. The T-shaped design of the drive rod 6 facilitates its installation and removal, achieving a rotational connection between the drive rod 6 and the square head 2 with the simplest structure.

[0018] 2. Rotary drilling: During the rotary drilling operation, the drill rod is pressed down and rotated clockwise, driving the drive rod 6 downward relative to the drill barrel 1. This in turn drives the door panel 4 downward through the connecting rod 5 until the door panel 4 closes the gap 12. At this point, the rotary drilling bit forms a complete barrel drill. At the same time, each hanging tooth 22 on the limit plate 21 slides in the corresponding chute until it slides to the bottom of the horizontal section 72 of the corresponding chute. Relying on the blocking effect of the hanging ear 7, the drill rod drives the entire rotary drilling bit to rotate, thus completing the rotary drilling operation. During the drilling process, the rotary drilling bit has an entire barrel drill structure, so that the cutting teeth 3 at its bottom can cut the loose rock in the rotary drilling area longitudinally, reducing the disturbance of the rock formation around the rotary drilling hole and thus preventing the rock formation from collapsing repeatedly due to loosening.

[0019] 3. Hole cleaning: After drilling for a period of time, we gently rotate the drill rod counterclockwise to make each hanging tooth 22 slide out of the horizontal section 72 of its corresponding chute, and then pull up the drill rod. Each hanging tooth 22 slides out of the vertical section 71 of its corresponding chute and slides upward. At the same time, the square head 2 drives the driving rod 6 to pull up, driving the door panel 4 to swing upward, thereby completing the blocking of the lower end of the drill tube 1, so that the debris in the drill tube 1 can be pulled up along with the drill tube 1.

[0020] 4. Debris removal: After the drill bit is lifted to the surface, the drill rig is used to move it to the debris removal location and place it on the ground. The drill rod is then pressed downward to flip the door panel 4 downward, opening the bottom of the drill barrel 1. The drill rod is then rotated clockwise to re-enter the horizontal sections 72 of the corresponding chutes. Finally, the drill rod is pulled up to lift the drill bit, allowing the debris inside to slide down, completing the debris removal operation.

[0021] The rotary drilling drill bit has an overall cylindrical drill structure, which can reduce the disturbance to the rock formation around the rotary drilling hole, thereby avoiding repeated collapse due to loosening. At the same time, it has a slag cleaning function that the cylindrical drill in the existing technology does not have, making it suitable for rotary drilling operations in loose rock formations, and the rotary drilling efficiency is high.

[0022] like Figure 2 and Figure 3 As shown, a plurality of limiting teeth 42 are welded on a surface of the door panel 4 near the interior of the drill tube 1, and each limiting tooth 42 extends downwardly beyond the door panel 4. The presence of each limiting tooth 42 can reduce the gap between the door panel 4 and the inner wall of the drill tube 1 when the door panel 4 is in the state of blocking the bottom of the drill tube 1, thereby reducing slag leakage. Moreover, when the door panel 4 blocks the gap 12, it also acts as a limit between the door panel 4 and the inner wall of the drill tube 1, preventing the door panel 4 from extending out of the drill tube 1 due to internal pressure, thereby ensuring the flatness of the inner wall of the rotary drilling hole.

[0023] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope defined by the appended claims.

Claims

1. A rotary drill bit for drilling holes in loose rock formations, characterized in that: The drill bit comprises a drill barrel (1) and a square head (2), wherein a plurality of cutting teeth (3) are distributed at the bottom of the drill barrel (1), and a top plate (11) is fixed to the top of the drill barrel (1); a notch (12) is opened on the side wall of the drill barrel (1), and a door plate (4) corresponding to the notch (12) is hingedly connected to the side wall of the drill barrel (1), and the door plate (4) can close the notch (12); a hinge seat (41) is fixed at the middle position of the inner side of the door plate (4), a connecting rod (5) is hingedly connected to the hinge seat (41), and a driving rod (6) is hingedly connected to the connecting rod (5); the square head (2) is located above the top plate (11), and the square head (2) A limit plate (21) is fixed at the bottom, and a through hole for the driving rod (6) to pass through is provided on the top plate (11) and the limit plate (21); a limit plate (61) is fixed on the top of the driving rod (6), and the limit plate (61) is located in the square head (2); a plurality of hanging ears (7) are fixed on the upper surface of the top plate (11), and a plurality of hanging teeth (22) corresponding to each hanging ear (7) are provided on the outer peripheral surface of the limit plate (21); a slide groove is provided on each of the hanging ears (7), and each slide groove includes a vertical section (71) and a horizontal section (72), and one surface of each hanging ear (7) is in close contact with the outer peripheral surface of the limit plate (21).

2. A rotary drilling bit for drilling holes in loose rock formations according to claim 1, characterized in that: A plurality of limiting teeth (42) are welded on a surface of the door panel (4) close to the interior of the drill tube (1), and each limiting tooth (42) extends downward to the outside of the door panel (4).

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