A drill bit structure

Abstract

This invention relates to the field of drilling construction technology and discloses a drill bit structure, comprising: a drill rod extending vertically; a drill body disposed at the lower end of the drill rod; a drill blade assembly disposed on the outer peripheral wall of the drill rod; and a pressure plate assembly comprising a plurality of pressure plates extending vertically, the plurality of pressure plates being circumferentially spaced on the drill blade assembly and located on a side close to the outer edge of the drill blade assembly, to compress the soil on the borehole wall of the foundation pile hole towards its borehole wall. The drill bit structure provided by this invention can effectively improve the strength and rigidity of the auger blade, preventing deformation or damage during use, while enhancing the hole formation and borehole wall stability of the foundation pile hole.

Description

Technical Field

[0001] This invention relates to the field of drilling construction technology, and in particular to a drill bit structure. Background Technology

[0002] In foundation pile engineering, the drill bit is a key piece of equipment for excavating pile holes. Traditional drill bit structures mainly consist of a drill rod, drill body, and drill blade assembly, with the drill blades responsible for transporting soil and rock cuttings. To effectively improve drilling efficiency, the drill blades need a large radial extension length, but this also makes the outer diameter of the drill blades significantly larger than the diameter of the middle drill rod section. Due to the long length of the drill blade extension, its strength and rigidity are difficult to guarantee effectively, especially during drilling, when the drill blades are frequently subjected to significant frictional forces from the borehole wall soil and rock cuttings. Under prolonged working conditions, the drill blades are prone to deformation or damage, severely affecting the service life of the drill bit and the overall drilling effect.

[0003] Furthermore, the soil and rock cuttings generated during drilling typically adhere to the borehole walls, causing them to become loose and unstable. This not only reduces the porosity and increases drilling difficulty but can also lead to borehole wall collapse, affecting the quality and stability of subsequent pile foundation construction. Especially during drilling, when the borehole walls are quite loose, the cutting efficiency of the drill bit and the stability of the borehole walls are often not effectively guaranteed, thus affecting the drilling quality and borehole formation speed. Summary of the Invention

[0004] The purpose of this invention is to provide a drill bit structure that can effectively improve the strength and rigidity of the auger blade, prevent it from deforming or being damaged during use, and enhance the hole formation and hole wall stability of the foundation pile hole.

[0005] To achieve the above objectives, the present invention provides a drill bit structure for drilling foundation pile holes, comprising:

[0006] A drill pipe that extends in a vertical direction;

[0007] A drill body, which is disposed at the lower end of the drill rod;

[0008] A drill blade assembly, wherein the drill blade assembly is disposed on the outer peripheral wall of the drill rod;

[0009] The pressure plate assembly includes a plurality of pressure plates extending in the vertical direction. The plurality of pressure plates are circumferentially spaced on the drill blade assembly and located on the side close to the outer edge of the drill blade assembly, so as to squeeze the soil on the hole wall of the foundation pile hole towards its hole wall.

[0010] Furthermore, the drill blade assembly includes a main drill blade and an auxiliary drill blade. The outer edges of the main drill blade and the auxiliary drill blade form a double helix structure, and the helix radii of the outer edges of the main drill blade and the auxiliary drill blade are the same and remain unchanged in the axial direction of the drill rod. The phase difference between the main drill blade and the auxiliary drill blade is 180°.

[0011] Furthermore, the pressure plate has a pressing surface facing the hole wall of the foundation pile hole. When viewed in the vertical direction, each pressure plate has a pressing angle between its pressing surface and the outer edge tangent of the main drill blade, and the opening of the pressing angle is opposite to the helical direction of the main drill blade.

[0012] Furthermore, the included angle of the compression is 15°-30°.

[0013] Furthermore, the lower end of the main drill blade has a first mounting line, and the lower end of the auxiliary drill blade has a second mounting line. Both the first mounting line and the second mounting line extend radially along the drill rod, and the extension directions of the first mounting line and the second mounting line are consistent. The first mounting line and the second mounting line are provided with a plurality of first drill teeth in their extension directions.

[0014] Furthermore, the drill body is detachably mounted on the lower end of the drill rod.

[0015] Furthermore, the lower end of the drill rod is provided with a mounting block, and the drill body includes a pin, a mounting part, and a soil-breaking part disposed at the lower end of the mounting part. The mounting block has a first through hole in the horizontal direction, the mounting part has a mounting cavity, the upper end of the mounting part has an opening, the opening is connected to the mounting cavity, the mounting part has a second through hole in the horizontal direction, the second through hole is connected to the mounting cavity, the mounting block is inserted into the mounting cavity through the opening, and the pin is inserted sequentially into the second through hole and the first through hole to fix the mounting part to the mounting block.

[0016] Furthermore, a protective plate is detachably provided inside the mounting cavity, which divides the mounting cavity into a first cavity and a second cavity arranged vertically. The mounting block is housed in the first cavity, and an angle sensor is placed inside the second cavity.

[0017] Furthermore, the soil-breaking section includes multiple drill plates, each drill plate being a right-angled trapezoid. The multiple drill plates are symmetrically arranged around the extension axis of the drill rod, with the right-angled side of each drill plate located at the lower end of the mounting section. The lower bottom edges of the multiple drill plates are welded together.

[0018] Furthermore, the soil-breaking section also includes a plurality of second drill teeth, which are disposed on the upper bottom edge and waist of the drill plate.

[0019] Compared with the prior art, the drill bit structure of this invention has the following advantages: multiple pressure plates are axially spaced on the drill blade assembly. During drilling, the drill body breaks up the soil, and most of the broken soil is discharged through the drill blades. The pressure plates squeeze a small portion of the soil against the hole wall of the foundation pile hole, thereby increasing the compactness of the hole wall, improving the stability of the foundation pile hole, reducing the risks during the hole formation process, and ensuring the quality of subsequent pile foundation construction. Moreover, the pressure plates extend in the vertical direction to connect the drill blades of each layer, which can effectively disperse the force generated during drilling, reduce the deformation and damage caused by excessive force on the drill blades, and thus extend the service life of the drill blades. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the drill bit structure according to an embodiment of the present invention;

[0021] Figure 2 This is an exploded view of the drill bit structure according to an embodiment of the present invention;

[0022] Figure 3 This is a cross-sectional view of the drill body of the drill bit structure according to an embodiment of the present invention;

[0023] Figure 4 This is a cross-sectional view of the drill bit structure according to an embodiment of the present invention;

[0024] In the diagram, 1 represents the drill pipe;

[0025] 2. Drill body; 201. Pin; 202. Mounting part; 2021. Mounting cavity; 20211. First cavity; 20212. Second cavity; 2022. Opening; 2023. Second perforation; 203. Soil breaking part; 2031. Drill plate; 20311. Second drill tooth;

[0026] 3. Drill blade assembly; 301. Main drill blade; 3011. First mounting line; 302. Auxiliary drill blade; 3021. Second mounting line; 303. First drill tooth;

[0027] 4. Pressure plate assembly; 401, pressure plate; 4011, extrusion surface; α, extrusion angle;

[0028] 5. Mounting block; 501. First perforation;

[0029] 6. Protective plate;

[0030] 7. Angle sensor. Detailed Implementation

[0031] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0032] In the description of this invention, the terms "upper," "lower," "left," "right," "front," "rear," "inner," "outer," "lateral," and "longitudinal," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to be constructed and operated in a specific orientation, and therefore should not be construed as limiting this utility model. Those skilled in the art can understand the specific meaning of these terms in this invention according to the specific circumstances.

[0033] In the description of this invention, the terms "provided with," "set up," "connected," and "placed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, elements, or components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0034] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, elements, or components (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0035] The technical solution of the present invention will be further described below with reference to the embodiments and accompanying drawings.

[0036] like Figure 1-4 As shown, an embodiment of the present invention provides a drill bit structure for drilling foundation pile holes, comprising:

[0037] Drill pipe 1 extends in the vertical direction;

[0038] Drill body 2 is located at the lower end of drill rod 1;

[0039] Drill blade assembly 3 is disposed on the outer peripheral wall of drill rod 1;

[0040] The pressure plate assembly 4 includes a plurality of pressure plates 401 extending in the vertical direction. The plurality of pressure plates 401 are circumferentially spaced on the drill blade assembly 3 and located on the side close to the outer edge of the drill blade assembly 3, so as to squeeze the soil on the hole wall of the foundation pile hole towards its hole wall.

[0041] Based on the above technical solution, multiple pressure plates 401 are axially spaced on the drill blade assembly 3. During drilling, the drill body 2 breaks the soil, and most of the broken soil is discharged through the drill blade. The pressure plates 401 squeeze a small portion of the soil against the hole wall of the foundation pile hole, thereby increasing the compactness of the hole wall, improving the stability of the foundation pile hole, reducing the risks in the hole formation process, and ensuring the quality of subsequent pile foundation construction. Moreover, the pressure plates 401 extend in the vertical direction to connect the drill blades of each layer, which can effectively disperse the force generated during drilling, reduce the deformation and damage caused by excessive force on the drill blade, and thus extend the service life of the drill blade.

[0042] Preferably, the drill blade assembly 3 includes a main drill blade 301 and an auxiliary drill blade 302. The outer edges of the main drill blade 301 and the auxiliary drill blade 302 form a double helix structure, and the helix radii of the outer edges of the main drill blade 301 and the auxiliary drill blade 302 are the same and remain unchanged in the axial direction of the drill rod 1. The phase difference between the main drill blade 301 and the auxiliary drill blade 302 is 180°.

[0043] In one specific embodiment, the lower end of the main drill blade 301 and the lower end of the auxiliary drill blade 302 are on the same horizontal plane. The upper and lower ends of each pressure plate 401 are respectively welded to the upper and lower ends of the corresponding drill blade assembly 3 in the extension direction of each pressure plate 401. At the position where the pressure plate 401 passes through the main drill blade 301 and the auxiliary drill blade 302, the pressure plate 401 is welded to the main drill blade 301 and the auxiliary drill blade 302.

[0044] Specifically, if the lower end of the drill blade assembly 3 in the extension direction of a certain pressure plate 401 corresponds to an auxiliary drill blade 302, then the lower end of the pressure plate 401 is connected to the auxiliary drill blade 302; if the lower end of the drill blade assembly 3 in the extension direction of a certain pressure plate 401 corresponds to a main drill blade 301, then the lower end of the pressure plate 401 is connected to the main drill blade 301.

[0045] The main drill blade 301 and the auxiliary drill blade 302 employ a double-helix structure with identical outer helix radii and a 180° phase difference. This allows them to work together during drilling, effectively sharing the load generated during drilling, reducing wear and deformation of individual drill blades, and significantly improving the drill bit's durability and service life. The double-helix structure effectively increases the discharge rate of soil and rock cuttings, reduces soil accumulation in the borehole, avoids excessive friction on the borehole wall, and ensures the drill bit's stability during operation. By adjusting the upper part of the pressure plate 401... The lower two ends are welded to the corresponding positions of the drill blade assembly 3, and the pressure plate 401 is welded to the drill blade assembly 3 at the position where the pressure plate 401 passes through the main drill blade 301 and the auxiliary drill blade 302. This ensures that the pressure plate 401 can firmly fix the main drill blade 301 and the auxiliary drill blade 302, preventing the drill blade from loosening or deforming due to external forces during operation, increasing the overall rigidity and strength of the drill blade, and the pressure plate 401 can repeatedly squeeze the hole wall, effectively compacting the soil at the hole wall and ensuring the stability of the hole formation.

[0046] More preferably, the pressure plate 401 has a pressing surface 4011 facing the hole wall of the foundation pile hole. When viewed in the vertical direction, the pressing surface 4011 of each pressure plate 401 has a pressing angle α between it and the outer edge tangent of the main drill blade 301 opposite to it. The opening 2022 of the pressing angle α faces the opposite direction of the spiral rotation of the main drill blade 301.

[0047] Because there is an extrusion angle α between the extrusion surface 4011 of the pressure plate 401 and the outer edge tangent of the main drill blade 301, and the opening 2022 of the extrusion angle α faces in the opposite direction to the spiral rotation of the main drill blade 301, there is an extrusion gap between the extrusion surface 4011 and the hole wall. In the spiral direction of the main drill blade 301, the inner diameter of the extrusion gap becomes smaller and smaller. During drilling, some soil will enter the extrusion gap from the opening 2022 of the extrusion angle α. Since the inner diameter of the extrusion gap becomes smaller and smaller in the spiral direction of the main drill blade 301, the soil will be extruded radially outward from the extrusion surface 4011 toward the drill rod 1, and the soil will be extruded onto the hole wall. After repeated extrusion, the hole wall can maintain good compaction, thereby improving the hole formation and hole wall stability of the foundation pile hole.

[0048] More preferably, the squeezing angle α is 15°-30°. The squeezing angle α is preferably 20°. If the squeezing angle α is less than 15°, less soil can enter the squeezing gap, meaning less pressure is applied to the borehole wall, resulting in insufficient soil filling and difficulty in effectively increasing the density of the soil on the borehole wall, increasing the risk of borehole wall collapse. If the squeezing angle α is greater than 30°, more soil can enter the squeezing gap, increasing the resistance to drilling. Moreover, more soil does not necessarily mean increased borehole wall density. After the pressure plate 401 compacts the soil on the borehole wall, excess soil will bulge out from the borehole wall, continuously hindering drilling, exacerbating wear on the drill bit structure itself, and increasing the burden on the equipment, potentially leading to more frequent maintenance and repairs.

[0049] More preferably, the lower end of the main drill blade 301 has a first mounting line 3011, and the lower end of the auxiliary drill blade 302 has a second mounting line 3021. Both the first mounting line 3011 and the second mounting line 3021 extend radially along the drill rod 1, and their extension directions are consistent. The first mounting line 3011 and the second mounting line 3021 are provided with multiple first drill teeth 303 in their extension directions. By providing multiple first drill teeth 303 in the extension directions of the first mounting line 3011 and the second mounting line 3021, the drill bit can simultaneously act on multiple cutting points of the formation during drilling, increasing the cutting surface of the drill bit. This enables more uniform and precise cutting during drilling, improves the adaptability of the drill bit under different geological conditions, and enhances drilling efficiency and stability.

[0050] Preferably, the drill body 2 is detachably mounted at the lower end of the drill rod 1.

[0051] More preferably, the lower end of the drill rod 1 is provided with a mounting block 5, and the drill body 2 includes a pin 201, a mounting part 202 and a soil-breaking part 203 provided at the lower end of the mounting part 202. The mounting block 5 has a first through hole 501 in the horizontal direction. The mounting part 202 has a mounting cavity 2021. The upper end of the mounting part 202 has an opening 2022, which is connected to the mounting cavity 2021. The mounting part 202 has a second through hole 2023 in the horizontal direction, which is connected to the mounting cavity 2021. The mounting block 5 is inserted into the mounting cavity 2021 through the opening 2022. The pin 201 passes through the second through hole 2023 and the first through hole 501 in sequence to fix the mounting part 202 to the mounting block 5.

[0052] The drill body 2 is detachable, allowing for convenient replacement or repair of the drill bit during use. Users can quickly disassemble and replace the drill body 2 when it is worn or damaged, without having to replace the entire drill bit structure, greatly improving maintenance efficiency, saving time and reducing maintenance costs. The fixing structure between the mounting block 5 and the drill body 2, through the cooperation of the pin 201, the first through hole 501, and the second through hole 2023, ensures a stable connection between the drill body 2 and the drill rod 1, making the mounting part 202 fit tightly with the mounting block 5, preventing loosening or detachment during drilling, and ensuring the working stability and safety of the drill bit structure.

[0053] More preferably, a protective plate 6 is detachably provided inside the mounting cavity 2021. The protective plate 6 divides the mounting cavity 2021 into a first cavity 20211 and a second cavity 20212 arranged vertically. The mounting block 5 is housed in the first cavity 20211, and an angle sensor 7 is placed inside the second cavity 20212.

[0054] Specifically, when the mounting block 5 is housed in the first cavity 20211, the lower end of the mounting block 5 abuts against the upper end of the protective plate 6.

[0055] An angle sensor 7 is installed in the second cavity 20212 to monitor the working angle of the drill bit in real time and adjust the working state of the drill bit according to the data fed back by the sensor. This helps to maintain the optimal angle of the drill bit during drilling, improve drilling accuracy, ensure the verticality and positioning accuracy of the foundation pile hole, reduce deviations and errors, and improve the quality of the operation. The protective plate 6 divides the mounting cavity 2021 into upper and lower cavities. The angle sensor 7 is placed in the second cavity 20212, which can effectively protect the angle sensor 7 from external impacts and friction damage during drilling. It avoids potential damage to the sensor caused by high temperature and vibration during drilling, and ensures the accuracy and long-term reliability of the angle sensor 7.

[0056] More preferably, the breaking section 203 includes a plurality of drill plates 2031, which are in the shape of right trapezoids. The plurality of drill plates 2031 are symmetrically arranged with the extension axis of the drill rod 1 as the center. The right-angled side of the drill plate 2031 is located at the lower end of the mounting section 202, and the lower bottom edges of the plurality of drill plates 2031 are welded together.

[0057] More preferably, the breaking section 203 also includes a plurality of second drill teeth 20311, which are disposed on the upper bottom edge and waist of the drill plate 2031.

[0058] Multiple drill plates 2031 are symmetrically arranged around the extension axis of the drill rod 1, ensuring uniform force distribution on the drill body 2 during drilling. This symmetrical arrangement helps maintain the stability and balance of the drill body 2, avoiding vibration or instability caused by asymmetrical force distribution, thereby improving drilling efficiency and accuracy. The second drill teeth 20311, located on the bottom edge and waist of the drill plate 2031, can effectively cut and break up the formation during drilling, increasing the cutting depth and breadth of the drill body 2. This allows the drill body 2 to drill more efficiently and stably when facing different types of soil and rock formations, enhancing its adaptability and versatility.

[0059] In summary, this embodiment of the invention provides a drill bit structure in which multiple pressure plates 401 are axially spaced on the drill blade assembly 3. During drilling, the drill body 2 breaks up the soil, and most of the broken soil is discharged through the drill blades. The pressure plates 401 squeeze a small portion of the soil against the hole wall of the foundation pile hole, thereby increasing the compactness of the hole wall, improving the stability of the foundation pile hole, reducing the risks during the hole formation process, and ensuring the quality of subsequent pile foundation construction. Moreover, the pressure plates 401 extend in the vertical direction to connect the drill blades of each layer, which can effectively disperse the force generated during drilling, reduce the deformation and damage caused by excessive force on the drill blades, and thus extend the service life of the drill blades.

[0060] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. A bit structure for drilling foundation pile holes, characterized by, Comprising: a drill rod (1) extending in the up-down direction; a drill body (2) provided at the lower end of the drill rod (1); a drill blade assembly (3) provided on the outer peripheral wall of the drill rod (1); a pressing plate assembly (4) comprising a plurality of pressing plates (401) extending in the up-down direction, a plurality of the pressing plates (401) being circumferentially spaced apart on the drill blade assembly (3) and located on the side close to the outer edge of the drill blade assembly (3) to extrude the soil of the hole wall of the foundation pile hole towards the hole wall; the drill blade assembly (3) comprises a main drill blade (301) and an auxiliary drill blade (302), the outer edge of the main drill blade (301) and the outer edge of the auxiliary drill blade (302) form a double helix structure, the helical radius of the outer edge of the main drill blade (301) and the outer edge of the auxiliary drill blade (302) is the same, and remains unchanged in the axial direction of the drill rod (1), the phase difference between the main drill blade (301) and the auxiliary drill blade (302) is 180°; the lower end of the main drill blade (301) and the lower end of the auxiliary drill blade (302) are on the same horizontal plane, the upper and lower ends of each pressing plate (401) are respectively welded to the upper and lower ends of the corresponding drill blade assembly (3) in the extension direction of the pressing plate (401), and the pressing plate (401) is welded and connected with the main drill blade (301) and the auxiliary drill blade (302) at the position where the pressing plate (401) passes through the main drill blade (301) and the auxiliary drill blade (302), the lower end of a certain pressing plate (401) corresponds to the auxiliary drill blade (302), and the lower end of the pressing plate (401) is connected with the auxiliary drill blade (302), the lower end of a certain pressing plate (401) corresponds to the main drill blade (301), and the lower end of the pressing plate (401) is connected with the main drill blade (301).

2. The drill bit structure of claim 1, wherein, the pressing plate (401) has an extrusion surface (4011) facing the hole wall of the foundation pile hole, and the extrusion surface (4011) of each pressing plate (401) has an extrusion included angle (α) between the tangent line of the outer edge of the main drill blade (301) opposite to it and the extrusion surface (4011), and the opening (2022) of the extrusion included angle (α) faces the opposite direction of the helical direction of the main drill blade (301).

3. The drill bit structure of claim 2, wherein, The angle of the extrusion included angle (α) is 15°-30°.

4. The drill bit structure of claim 1, wherein, the lower end of the main drill blade (301) has a first mounting line (3011), the lower end of the auxiliary drill blade (302) has a second mounting line (3021), the first mounting line (3011) and the second mounting line (3021) both extend in the radial direction of the drill rod (1), and the extension directions of the first mounting line (3011) and the second mounting line (3021) are consistent, and a plurality of first drill teeth (303) are arranged on the first mounting line (3011) and the second mounting line (3021) in the extension direction thereof.

5. The drill bit structure of claim 1, wherein, The drill body (2) is detachably arranged at the lower end of the drill rod (1).

6. The drill bit structure of claim 5, wherein, The lower end of the drill rod (1) is provided with a mounting block (5), the drill body (2) comprises a latch (201), a mounting portion (202) and a soil breaking portion (203) arranged at the lower end of the mounting portion (202), the mounting block (5) is provided with a first through hole (501) in the horizontal direction, the mounting portion (202) has a mounting cavity (2021), the upper end of the mounting portion (202) is provided with an opening (2022), the opening (2022) is in communication with the mounting cavity (2021), the mounting portion (202) is provided with a second through hole (2023) in the horizontal direction, the second through hole (2023) is in communication with the mounting cavity (2021), the mounting block (5) is arranged in the mounting cavity (2021) through the opening (2022), and the latch (201) penetrates the second through hole (2023) and the first through hole (501) in sequence to fix the mounting portion (202) on the mounting block (5).

7. The drill bit structure of claim 6, wherein, A protection plate (6) is detachably arranged in the mounting cavity (2021), the protection plate (6) divides the mounting cavity (2021) into a first cavity (20211) and a second cavity (20212) arranged in the upper and lower directions, the mounting block (5) is arranged in the first cavity (20211), and the second cavity (20212) contains an angle sensor (7).

8. The drill bit structure of claim 6, wherein, The soil breaking portion (203) comprises a plurality of drill plates (2031), the drill plates (2031) are in the shape of a right-angled trapezoid, a plurality of the drill plates (2031) are symmetrically arranged around the extension axis of the drill rod (1), the right-angle side of the drill plate (2031) is arranged at the lower end of the mounting portion (202), and the lower bottom edges of a plurality of the drill plates (2031) are welded together.

9. The drill bit structure of claim 8, wherein, The soil breaking portion (203) further comprises a plurality of second drill teeth (20311), and a plurality of the second drill teeth (20311) are arranged on the upper bottom edges and waists of the drill plates (2031).

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