Drill bit device for rotary excavating pile

Abstract

The utility model discloses a drill bit device for a rotary excavating pile, relates to the field of rotary excavating drills, and solves the problems of difficulty in hole forming, low construction quality, slow construction progress, high safety risk and deviation caused by difficulty in footage in a drilling process after a hole formed by the conventional rotary excavating drill enters a moderately weathered rock stratum. The drilling tool is technically characterized by comprising a drilling tool body; the connecting structure is mounted on the drilling tool body, and the connecting structure is used for connection; the convex structure is mounted on the drilling tool body; and the cutting structure is installed on the drilling tool body, and the cutting structure is used for drilling holes. The construction progress is accelerated, cost is reduced, hole position deviation is avoided, construction accuracy is improved, the structure is relatively simple, and use is convenient.

Description

Technical Field

[0001] This utility model relates to the field of rotary drilling technology, and in particular to a rotary pile drill bit device. Background Technology

[0002] Rotary drilling is a construction technique suitable for hole-forming operations in building foundation engineering. It is widely used in foundation construction projects such as municipal construction, highway bridges, and high-rise buildings. With different drilling tools, it is suitable for dry (short spiral) or wet (rotary bucket) hole-forming operations in rock strata (core drill).

[0003] Current rotary drilling operations face difficulties in drilling through moderately weathered rock strata, resulting in low rock breaking efficiency. In moderately weathered granite (80 MPa), the average daily drilling depth is only 0.3-0.5 m, leading to poor construction quality, slow progress, and high safety risks. Traditional cutting teeth rely on axial pressure to break rock, which easily causes slippage in hard rock strata, resulting in a tool wear rate of 0.8 mm / h (the industry standard critical value is 0.5 mm / h). Difficult drilling depth leads to deviations. Conventional auger bits have simple chip guide designs and unreasonable lead angles, easily causing chip accumulation and repeated breaking, reducing drilling speed and accelerating bit wear. The cutting tooth layout is mostly uniform and symmetrical, lacking synergy with the rock-breaking unit of the roller cone, making it prone to deviation or jamming when drilling in hard rock strata. The connection between the roller cone and the drill body is often fixed with bolts or integrally cast, which is prone to loosening due to vibration or fatigue fracture, resulting in high maintenance costs. Therefore, designing a rotary pile drill bit device is essential to solve these problems. Utility Model Content

[0004] This utility model aims to solve the technical problems in the current rotary drilling operation, such as difficulty in drilling into moderately weathered rock layers, low construction quality, slow construction progress, high safety risks, and deviation caused by difficulty in drilling depth. It provides a rotary pile drill bit device.

[0005] To solve the above-mentioned technical problems, the specific technical solution of this utility model is as follows:

[0006] A rotary pile drilling bit device, comprising:

[0007] The drill bit body, the connecting structure mounted on the drill bit body, the protruding structure mounted on the drill bit body, the cutting structure mounted on the drill bit body, the first connecting structure mounted on the drill bit body, the first spherical structure mounted on the first connecting structure, the second connecting structure mounted on the drill bit body, and the second spherical structure mounted on the second connecting structure.

[0008] The drill bit body has a cylindrical structure and an internal chip removal channel. The protruding structure is welded to the outer wall of the drill bit body with a lead angle of 32°±2° to form a continuous chip removal groove. The cutting structure is radially distributed on the lower end face edge of the drill bit body. The first spherical structure is installed on the lower end face of the drill bit body through a first connecting structure, and the second spherical structure is installed on the lower end face of the drill bit body through a second connecting structure.

[0009] Preferably, the connection structure includes: a connecting portion;

[0010] The connecting part is installed on the upper surface of the drill body.

[0011] Preferably, the protrusion structure includes: a spiral plate;

[0012] The spiral blades are installed on the side surface of the drill body.

[0013] Preferably, the cutting structure includes: two pairs of cutting teeth;

[0014] Two pairs of cutting teeth are installed on the lower surface of the drill body, and the two pairs of cutting teeth are arranged symmetrically at the edge of the lower surface of the drill body.

[0015] Preferably, the first connection structure includes: two pairs of first connecting blocks and two pairs of first bases;

[0016] Two pairs of first trapezoidal notches are symmetrically arranged at the lower surface edge of the drill bit body. Each first trapezoidal notch has a first strip notch. Each first connecting block is welded to the corresponding first strip notch. Each first seat is installed at the corresponding first connecting block.

[0017] Preferably, the first spherical structure includes: two pairs of first limiting rotating rods and two pairs of first toothed gears;

[0018] Each of the first limiting rotating rods is mounted on the first base, and each of the first toothed gears is mounted on the first limiting rotating rod.

[0019] Preferably, the second connection structure includes: two pairs of second connecting blocks and two pairs of second bases;

[0020] Two pairs of second trapezoidal notches are symmetrically arranged at the lower surface edge of the drill bit body. Each second trapezoidal notch has a second strip-shaped notch. Each second connecting block is welded to the corresponding second strip-shaped notch, and each second seat is installed at the corresponding second connecting block.

[0021] Preferably, the second spherical structure includes: two pairs of second limiting rotating rods and two pairs of second toothed gears;

[0022] Each of the second limiting rotating rods is mounted on the second base, and each of the second toothed gears is mounted on the second limiting rotating rod.

[0023] Preferably, the first toothed wheel includes: a first hemispherical sphere and a plurality of first protrusions;

[0024] Several of the first protrusions are mounted on the first hemispherical sphere.

[0025] Preferably, the second toothed wheel includes: a second hemispherical sphere and a plurality of second protrusions;

[0026] Several of the second protrusions are mounted on the second hemispherical sphere.

[0027] This utility model has the following beneficial effects:

[0028] This rotary drilling bit device adds roller cones to the rotary drill bit, which not only solves the difficulty of drilling into moderately weathered rock, but also improves construction quality and speeds up construction progress. It is very convenient and reduces unnecessary troubles. It adopts a three-stage crushing mechanism: the main cutting tooth initially crushes to 80~120 mm, the first roller cone crushes to 30~50 mm, and the second roller cone crushes to 5~15 mm. It is convenient to construct, the quality is controllable, the safety risk is low, the construction progress is accelerated and the cost is reduced, the hole position deviation is avoided, and the construction accuracy is improved. The average daily advance in moderately weathered rock (80MPa) reaches 0.8~1.2m (0.3~0.5m in traditional process), which is 160%~240% higher. The energy consumption of crushing rock per unit rock layer is 1.5kWh / m³ (3.2kWh / m³ in traditional process), which saves energy by 53%. The cutting force of the cutting tooth is evenly distributed, reducing drilling deviation. The structure is relatively simple and easy to use. Attached Figure Description

[0029] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0030] Figure 1 This is a schematic diagram of the structure of a rotary pile drilling bit device according to the present invention;

[0031] Figure 2 This is a front view of a rotary pile drilling bit device according to the present invention;

[0032] Figure 3 This is a top view of a rotary pile drilling bit device according to the present invention;

[0033] Figure 4 This is a bottom view of a rotary pile drilling bit device according to the present invention;

[0034] Figure 5 This is a partial schematic diagram of the first toothed wheel of this utility model;

[0035] Figure 6 This is a partial schematic diagram of the second toothed wheel of this utility model.

[0036] The reference numerals in the figure are:

[0037] Drill body 10, connecting structure 20, protruding structure 30, cutting structure 40, first connecting structure 50, first spherical structure 60, second connecting structure 70, second spherical structure 80;

[0038] Connecting part 21;

[0039] Spiral blade 31;

[0040] Cutting teeth 41;

[0041] First connecting block 51, first base body 52;

[0042] First toothed ring 61;

[0043] Second connecting block 71, second base 72;

[0044] Second gear 81;

[0045] First semi-circular sphere 621, first protrusion 622;

[0046] The second semi-circular sphere 821 and the second protrusion 822. Detailed Implementation

[0047] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. It should be noted that, for ease of description, in this application, "left side" is referred to as "first end", "right side" as "second end", "upper side" as "first end", and "lower side" as "second end" in the current view. The purpose of such description is to clearly express the technical solution and should not be construed as an improper limitation of the technical solution of this application.

[0048] Please see Figure 1-6 As shown, a rotary pile drill bit device includes: a drill bit body 10, a connecting structure 20 mounted on the drill bit body 10, a protruding structure 30 mounted on the drill bit body 10, a cutting structure 40 mounted on the drill bit body 10, a first connecting structure 50 mounted on the drill bit body 10, a first spherical structure 60 mounted on the first connecting structure 50, a second connecting structure 70 mounted on the drill bit body 10, and a second spherical structure 80 mounted on the second connecting structure 70.

[0049] The drill body 10 has a cylindrical structure and an internal chip removal channel. The protruding structure 30 is welded to the outer wall of the drill body 10 with a lead angle of 32°±2° to form a continuous chip removal groove. The cutting structure 40 is radially distributed on the lower end face edge of the drill body 10. The first spherical structure 60 is installed on the lower end face of the drill body 10 through the first connecting structure 50, and the second spherical structure 80 is installed on the lower end face of the drill body 10 through the second connecting structure 70.

[0050] The drill body 10 is made of high-strength alloy steel and has a hollow cylindrical structure with a smooth inner wall and a chip removal channel with a diameter of 200mm inside.

[0051] The connection structure 20 includes a connection part 21, which is mounted on the upper surface of the drill body 10.

[0052] Rotary drilling rigs are connected to the connecting part 21 on the upper surface of the drill body 10, thereby performing rotary drilling.

[0053] The top of the drill body 10 is welded with a flange-type connection part 21, and the flange end face is provided with bolt holes to adapt to the power head interface of a standard rotary drilling rig.

[0054] The protruding structure 30 includes a spiral blade 31, which is mounted on the side surface of the drill body 10.

[0055] The cuttings are discharged through the spiral blades 31 on the side surface of the drill body 10.

[0056] Spiral blade 31 is a 12mm thick manganese steel spiral blade, which is continuously welded to the outer wall of the drill bit body with a lead angle of 32°±2°. The spiral blade width is 50mm and the spacing between adjacent spiral blades is 80mm, forming a continuous chip removal groove.

[0057] The cutting structure 40 includes two pairs of cutting teeth 41, which are mounted on the lower surface of the drill body 10 and arranged symmetrically at the edge of the lower surface of the drill body 10.

[0058] Cutting teeth 41, arranged symmetrically on the lower surface edge of the drill body 10, are used to prevent secondary grinding of drill cuttings caused by the debris generated after cutting.

[0059] Cutting teeth 41 are cemented carbide cutting teeth, which are radially and symmetrically welded to the lower end face edge of the drill body. Each tooth is 80mm long, with a cutting angle of 55°. The tooth tip is inlaid with a diamond composite sheet. The distance between adjacent cutting teeth is 120mm. Through finite element simulation verification, the stress concentration factor is reduced to below 0.8.

[0060] The first connecting structure 50 includes: two pairs of first connecting blocks 51 and two pairs of first bases 52. Two pairs of first trapezoidal notches are symmetrically arranged at the lower surface edge of the drill body 10. Each first trapezoidal notch is provided with a first strip notch. Each first connecting block 51 is welded to the corresponding first strip notch. Each first base 52 is installed at the corresponding first connecting block 51.

[0061] The first connecting block 51 and the first base 52 are used to connect to the first spherical structure, so that the spherical structure is biased to the outside.

[0062] The lower end face of the drill bit body 10 is machined with a first trapezoidal notch (the notch is 60mm wide at the bottom and 80mm wide at the top). A first strip-shaped welding groove is opened inside the notch. The first connecting block 51 and the first base body 52 are forged from chromium-molybdenum steel and welded into the strip groove.

[0063] The first spherical structure 60 includes: two pairs of first limiting rotating rods and two pairs of first toothed gears 61, each first limiting rotating rod being mounted on the first base 52, and each first toothed gear 61 being mounted on the first limiting rotating rod.

[0064] The first toothed wheel 61 is positioned by the first limiting rotating rod, and the first toothed wheel 61 can rotate on the first limiting rotating rod. Through the revolution of the drill body 10 and the rotation of the first toothed wheel 61, the rock strata are ground and broken by impact.

[0065] The second connection structure 70 includes: two pairs of second connection blocks 71 and two pairs of second base bodies 72. Two pairs of second trapezoidal notches are symmetrically arranged at the lower surface edge of the drill body 10. Each second trapezoidal notch is provided with a second strip notch. Each second connection block 71 is welded to the corresponding second strip notch. Each second base body 72 is installed at the corresponding second connection block 71.

[0066] The second connecting block 71 and the second base 72 are used to connect to the second spherical structure, causing the spherical structure to be biased outward.

[0067] The second trapezoidal notch has a bottom width of 80mm and a top width of 100mm. The second connecting block 71 and the second seat 72 are welded inside the second strip groove.

[0068] The spiral blade (30) is connected to the first connecting block 51 and the second connecting block 71 by pulsed argon arc welding, and stress is eliminated by post-weld heat treatment.

[0069] The second spherical structure 80 includes two pairs of second limiting rotating rods and two pairs of second toothed gears 81. Each second limiting rotating rod is mounted on the second base 72, and each second toothed gear 81 is mounted on the second limiting rotating rod.

[0070] The second limit rotating rod limits the position of the second toothed wheel 81, allowing the second toothed wheel 81 to rotate on the second limit rotating rod. Through the revolution of the drill body 10 and the rotation of the second toothed wheel 81, the rock strata are ground and broken by impact.

[0071] The first toothed wheel 61 includes a first semi-circular sphere 621 and a plurality of first protrusions 622, the plurality of first protrusions 622 being mounted on the first semi-circular sphere 621.

[0072] The second toothed wheel 81 includes a second semi-circular sphere 821 and a plurality of second protrusions 822, the plurality of second protrusions 822 being mounted on the second semi-circular sphere 821.

[0073] The first semi-circular sphere 621 has a diameter of 60mm and 12 sets of conical first protrusions 622 are welded to its surface. The first protrusions 622 are conical tungsten carbide protrusions with a height of 5mm and are arranged in a 6×2 matrix. The second semi-circular sphere 821 has a diameter of 80mm and is eccentrically designed (eccentricity distance 10mm). 12 sets of second protrusions 822 are welded to its surface, with a protrusion height of 8-12mm gradually distributed.

[0074] First, the site is leveled. After the excavator digs, the retaining wall is manually constructed. Then, mechanical drilling is used. Through the revolution of the drill body 10, combined with the rotation of the first toothed cone 61 and the second toothed cone 81, the rock strata are ground and broken by impact. The first connecting structure 50 and the second connecting structure 70 are fixed to the end of the drill head by welding, so that the first spherical structure 60 and the second spherical structure 80 and the drill body 10 form a whole. It is easy to operate on site and effectively solves the difficulty of drilling after entering the moderately weathered rock strata, further accelerating the construction progress.

[0075] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A rotary pile drilling bit device, characterized in that, include: Drill body (10), connecting structure (20) mounted on drill body (10), protrusion structure (30) mounted on drill body (10), cutting structure (40) mounted on drill body (10), first connecting structure (50) mounted on drill body (10), first spherical structure (60) mounted on first connecting structure (50), second connecting structure (70) mounted on drill body (10), and second spherical structure (80) mounted on second connecting structure (70); The drill body (10) has a cylindrical structure and is provided with a chip removal channel inside. The protruding structure (30) is welded to the outer wall of the drill body (10) with a lead angle of 32°±2° to form a continuous chip removal groove. The cutting structure (40) is radially distributed on the lower end face edge of the drill body (10). The first spherical structure (60) is installed on the lower end face of the drill body (10) through the first connecting structure (50). The second spherical structure (80) is installed on the lower end face of the drill body (10) through the second connecting structure (70).

2. A rotary excavating pile bit apparatus as claimed in claim 1, wherein, The connection structure (20) includes: a connection part (21); The connecting part (21) is installed on the upper surface of the drill body (10).

3. The rotary pile drilling bit device as described in claim 1, characterized in that, The protruding structure (30) includes: a spiral plate (31); The spiral blade (31) is installed on the side surface of the drill body (10).

4. The auger pile drill bit apparatus of claim 1, wherein, The cutting structure (40) includes: two pairs of cutting teeth (41); Two pairs of cutting teeth (41) are installed on the lower surface of the drill body (10), and the two pairs of cutting teeth (41) are arranged symmetrically at the edge of the lower surface of the drill body (10).

5. The auger pile drill bit apparatus of claim 1, wherein, The first connection structure (50) includes: two pairs of first connection blocks (51) and two pairs of first bases (52); The lower surface edge of the drill body (10) is provided with two pairs of first trapezoidal notches in sequence. Each first trapezoidal notch is provided with a first strip notch. Each first connecting block (51) is welded to the corresponding first strip notch. Each first seat (52) is installed at the corresponding first connecting block (51).

6. A rotary excavating pile bit apparatus as claimed in claim 5, wherein, The first spherical structure (60) includes: two pairs of first limiting rotating rods and two pairs of first toothed gears (61); Each of the first limiting rotating rods is mounted on the first base (52), and each of the first toothed gears (61) is mounted on the first limiting rotating rod.

7. A rotary excavating pile bit apparatus as claimed in claim 1, wherein, The second connection structure (70) includes: two pairs of second connection blocks (71) and two pairs of second bases (72); The lower surface edge of the drill body (10) is provided with two pairs of second trapezoidal notches in sequence. Each second trapezoidal notch is provided with a second strip notch. Each second connecting block (71) is welded to the corresponding second strip notch. Each second seat (72) is installed at the corresponding second connecting block (71).

8. A rotary excavating pile bit apparatus as claimed in claim 7, wherein, The second spherical structure (80) includes: two pairs of second limiting rotating rods and two pairs of second toothed gears (81); Each of the second limiting rotating rods is mounted on the second seat (72), and each of the second toothed gears (81) is mounted on the second limiting rotating rod.

9. A rotary excavating pile bit apparatus as claimed in claim 6, wherein, The first toothed wheel (61) includes: a first hemispherical sphere (621) and a plurality of first protrusions (622); Several of the first protrusions (622) are mounted on the first hemispherical sphere (621).

10. A rotary excavating pile bit apparatus as claimed in claim 8, wherein, The second toothed wheel (81) includes: a second semi-spherical sphere (821) and a plurality of second protrusions (822); Several of the second protrusions (822) are mounted on the second semi-circular sphere (821).

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