Drill bit structure

Abstract

The invention relates to the technical field of drilling construction, and discloses a drill bit structure which comprises a drill rod extending in the vertical direction; the drill body is arranged at the lower end of the drill rod; the drill blade assembly is arranged on the peripheral wall of the drill rod; the pressing plate assembly comprises a plurality of pressing plates extending in the vertical direction, and the multiple pressing plates are arranged on the drilling blade assembly in the circumferential direction at intervals and located on the side close to the outer edge of the drilling blade assembly so as to extrude soil on the hole wall of the foundation pile hole towards the hole wall of the foundation pile hole. According to the drill bit structure, the strength and rigidity of the spiral blades can be effectively improved, the spiral blades are prevented from being deformed or damaged in the using process, and meanwhile the hole forming performance and the hole wall stability of a foundation pile hole are enhanced.

Description

Technical Field

[0001] The invention relates to the technical field of drilling construction, in particular to a drill bit structure. Background Art

[0002] In foundation pile engineering, the drill bit is the key equipment for pile hole excavation. The traditional drill bit structure is mainly composed of a drill rod, a drill body and a drill blade assembly. The drill blade plays the role of transporting soil debris and rock cuttings. In order to effectively improve the drilling efficiency, the drill blade needs to have a large radial extension length, but this also makes the outer diameter of the drill blade significantly larger than the diameter of the middle drill rod section. Due to the long length of the extended part of the drill blade, its strength and rigidity are difficult to be effectively guaranteed. Especially during the drilling process, the drill blade is often subjected to large friction from the soil and rock cuttings on the hole wall. Under long-term working conditions, the drill blade is prone to deformation or damage, which seriously affects the service life of the drill bit and the overall drilling effect.

[0003] In addition, the soil and rock debris generated by the drill bit during the drilling process usually adhere to the hole wall of the foundation pile hole, causing the hole wall to be loose and unstable. This not only reduces the hole-forming performance and increases the difficulty of drilling, but may also cause the hole wall to collapse, affecting the quality and stability of subsequent pile foundation construction. Especially during the drilling process, the looseness of the hole wall is relatively large, and the cutting efficiency of the drill bit and the stability of the hole wall are often not effectively guaranteed, which in turn affects the quality and speed of drilling. Summary of the invention

[0004] The purpose of the present invention is to provide a drill bit structure which can effectively improve the strength and rigidity of the spiral blades, prevent them from being deformed or damaged during use, and at the same time enhance the hole forming performance and hole wall stability of the foundation pile hole.

[0005] In order to achieve the above object, the present invention provides a drill bit structure for drilling a foundation pile hole, which comprises: A drill rod extending in an up-down direction; A drill body, the drill body being arranged at the lower end of the drill rod; A drill blade assembly, the drill blade assembly being arranged on the outer peripheral wall of the drill rod; A pressure plate assembly, the pressure plate assembly includes a plurality of pressure plates extending in the up-down direction, the plurality of pressure plates are circumferentially spaced apart on the drill blade assembly and are located on a side close to the outer edge of the drill blade assembly to squeeze the soil on the hole wall of the foundation pile hole toward the hole wall.

[0006] Furthermore, the drill blade assembly includes a main drill blade and an auxiliary drill blade, the outer edge of the main drill blade and the outer edge of the auxiliary drill blade are in a double helix structure, and the spiral radius of the outer edge of the main drill blade and the outer edge of the auxiliary drill blade are the same and remain unchanged in the axial direction of the drill rod, and the phase difference between the main drill blade and the auxiliary drill blade is 180°.

[0007] Furthermore, the pressure plate has an extrusion surface, which faces the hole wall of the foundation pile hole. When viewed in the up and down direction, there is an extrusion angle between the extrusion surface of each pressure plate and the tangent line of the outer edge of the main drill blade opposite thereto, and the opening direction of the extrusion angle is opposite to the spiral direction of the main drill blade.

[0008] Furthermore, the extrusion angle is 15°-30°.

[0009] 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. The first mounting line and the second mounting line both extend radially along the drill rod, and the extension direction of the first mounting line is consistent with that of the second mounting line. The first mounting line and the second mounting line are provided with a plurality of first drill teeth in their extension directions.

[0010] Furthermore, the drill body is detachably arranged at the lower end of the drill rod.

[0011] Furthermore, a mounting block is provided at the lower end of the drill rod, the drill body includes a latch, a mounting portion and a ground-breaking portion arranged at the lower end of the mounting portion, the mounting block is provided with a first through hole in the horizontal direction, the mounting portion has a mounting cavity, an opening is provided at the upper end of the mounting portion, the opening is communicated with the mounting cavity, the mounting portion is provided with a second through hole in the horizontal direction, the second through hole is communicated with the mounting cavity, the mounting block is inserted into the mounting cavity through the opening, and the latch is inserted into the second through hole and the first through hole in sequence to fix the mounting portion on the mounting block.

[0012] Furthermore, a protective plate is detachably provided in the installation cavity, and the protective plate divides the installation cavity into a first cavity and a second cavity arranged up and down, the installation block is accommodated in the first cavity, and the second cavity contains an angle sensor.

[0013] Furthermore, the earth-breaking part includes multiple drill plates, which are in the shape of a right-angled trapezoid. The multiple drill plates are symmetrically arranged with the extension axis of the drill rod as the center, the right-angled sides of the drill plates are arranged at the lower end of the mounting part, and the lower bottom sides of the multiple drill plates are welded together.

[0014] Furthermore, the soil breaking part further comprises a plurality of second drill teeth, and the plurality of second drill teeth are arranged on the upper bottom edge and waist of the drill plate.

[0015] Compared with the prior art, a drill bit structure according to an embodiment of the present invention has the following beneficial effects: a plurality of pressure plates are axially spaced apart and arranged on the drill blade assembly; during the drilling process, the drill body breaks the soil, and most of the broken soil is discharged through the drill blades; the pressure plates squeeze a small portion of the soil toward the hole wall of the foundation pile hole, thereby increasing the compactness of the hole wall, thereby improving the stability of the foundation pile hole, reducing the risk in the hole forming process, and ensuring the quality of subsequent pile foundation construction; and the pressure plates extend in the up and down directions to connect each layer of drill blades, which can effectively disperse the force generated during the drilling process, reduce the deformation and damage of the drill blades caused by excessive force, and thus extend the service life of the drill blades. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic diagram of the overall structure of a drill bit structure according to an embodiment of the present invention; Figure 2 is an exploded view of a drill bit structure according to an embodiment of the present invention; Figure 3 is a cross-sectional view of a drill body of a drill bit structure according to an embodiment of the present invention; Figure 4 is a cross-sectional view of a drill bit structure according to an embodiment of the present invention; In the figure, 1, drill pipe; 2. Drill body; 201. latch; 202. mounting portion; 2021. mounting cavity; 20211. first cavity; 20212. second cavity; 2022. opening; 2023. second perforation; 203. earth-breaking portion; 2031. drill plate; 20311. second drill tooth; 3. Drill blade assembly; 301. Main drill blade; 3011. First mounting line; 302. Auxiliary drill blade; 3021. Second mounting line; 303. First drill tooth; 4. Pressing plate assembly; 401. Pressing plate; 4011. Extrusion surface; α. Extrusion angle; 5. Mounting block; 501. First perforation; 6. Protection plate; 7. Angle sensor. DETAILED DESCRIPTION

[0017] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0018] In the description of the present invention, the terms "upper", "lower", "left", "right", "front", "rear", "inner", "outer", "lateral", "longitudinal" and the like used to indicate the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only used to facilitate the description of the present invention and simplify the description, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. For those of ordinary skill in the art, the specific meanings of these terms in the present invention can be understood according to specific circumstances.

[0019] In the description of the present invention, the terms "provided with", "set", "connected", and "placed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0020] In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0021] The technical solution of the present invention is further described below in conjunction with embodiments and drawings.

[0022] like Figure 1-4 As shown, a drill bit structure according to an embodiment of the present invention is used for drilling a foundation pile hole, and comprises: A drill rod 1, the drill rod 1 extends in an up-down direction; A drill body 2, which is arranged at the lower end of the drill rod 1; A drill blade assembly 3, the drill blade assembly 3 is arranged on the outer peripheral wall of the drill rod 1; The pressure plate assembly 4 includes a plurality of pressure plates 401 extending in the up-down direction. The plurality of pressure plates 401 are circumferentially spaced on the drill blade assembly 3 and are located on a side close to the outer edge of the drill blade assembly 3 to squeeze the soil on the hole wall of the foundation pile hole toward the hole wall.

[0023] Based on the above technical solution, multiple pressure plates 401 are axially spaced apart and arranged on the drill blade assembly 3. During the drilling process, the drill body 2 breaks the soil, and most of the broken soil is discharged through the drill blades. The pressure plates 401 squeeze a small part of the soil toward the hole wall of the foundation pile hole, thereby increasing the compactness of the hole wall, thereby improving the stability of the foundation pile hole, reducing the risk in the hole forming process, and ensuring the quality of subsequent pile foundation construction; and the pressure plates 401 extend in the up and down directions to connect each layer of drill blades, which can effectively disperse the force generated during the drilling process, reduce the deformation and damage of the drill blades caused by excessive force, and thus extend the service life of the drill blades.

[0024] Preferably, the drill blade assembly 3 includes 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 are in a double helix structure, and the spiral radius of the outer edge of the main drill blade 301 and the outer edge of 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°.

[0025] In a 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, and 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, and 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.

[0026] Specifically, if the lower end of the drill blade assembly 3 in the extension direction of a certain pressure plate 401 corresponds to the 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 the main drill blade 301, then the lower end of the pressure plate 401 is connected to the main drill blade 301.

[0027] The main drill blade 301 and the auxiliary drill blade 302 adopt a double helix structure, and their outer spiral radius is the same, and the phase difference is maintained at 180 degrees, so that the two can cooperate with each other during the drilling process, effectively share the load generated during drilling, reduce the wear and deformation of a single drill blade, and thus significantly improve the durability and service life of the drill bit; the double helix structure can effectively increase the discharge speed of soil debris and rock cuttings, reduce the accumulation of soil debris in the hole, avoid excessive friction on the hole wall, and ensure the stability of the drill bit during operation; by 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, ensuring that the pressure plate 401 can firmly fix the main drill blade 301 and the auxiliary drill blade 302 to prevent the drill blade from loosening or deforming due to external force during operation, thereby increasing the overall rigidity and strength of the drill blade, and the pressure plate 401 can repeatedly squeeze the hole wall, which can effectively increase the compactness of the soil at the actual hole wall and ensure the stability of the hole.

[0028] More preferably, the pressure plate 401 has an extrusion surface 4011, which faces the hole wall of the foundation pile hole. When viewed in the up and down direction, an extrusion angle α is provided between the extrusion surface 4011 of each pressure plate 401 and the outer edge tangent of the main drill blade 301 opposite thereto. The opening 2022 of the extrusion angle α is oriented opposite to the spiral direction of the main drill blade 301.

[0029] Since there is an extrusion angle α between the extrusion surface 4011 of the pressure plate 401 and the tangent line of the outer edge of the main drill blade 301, and the opening 2022 of the extrusion angle α is opposite to the spiral rotation direction of the main drill blade 301, there is an extrusion gap between the extrusion surface 4011 and the hole wall, and the inner diameter of the extrusion gap becomes smaller and smaller in the rotation direction of the main drill blade 301. During drilling, part of the 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 rotation direction of the main drill blade 301, the soil will be squeezed radially outward toward the drill rod 1 by the extrusion surface 4011, and the soil will be squeezed onto the hole wall. After repeated extrusion, the hole wall can maintain a good density, thereby improving the porosity and hole wall stability of the foundation pile hole.

[0030] More preferably, the extrusion angle α is 15°-30°. The extrusion angle α is preferably 20°. If the extrusion angle α is less than 15°, less soil can enter the extrusion gap, that is, the pressure applied to the hole wall is small, the amount of soil filling the hole wall is insufficient, it is difficult to effectively increase the density of the hole wall soil, and the risk of hole wall collapse is prone to occur; if the extrusion angle α is greater than 30°, more soil can enter the extrusion gap, increasing the resistance of the drill bit structure to drilling, and more soil does not mean an increase in the density of the hole wall. After the pressure plate 401 compacts the hole wall soil, excess soil will bulge from the hole wall, continuously hindering drilling, aggravating the wear of the drill bit structure itself, and increasing the burden on the equipment, which may lead to more frequent maintenance and repair.

[0031] 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. 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 direction of the first mounting line 3011 and the second mounting line 3021 is consistent. The first mounting line 3011 and the second mounting line 3021 are provided with a plurality of first drill teeth 303 in their extension direction. By providing a plurality of first drill teeth 303 in the extension direction of the first mounting line 3011 and the second mounting line 3021, the drill bit can act on a plurality of cutting points of the formation at the same time during the drilling process, increasing the cutting surface of the drill bit, being able to achieve more uniform and precise cutting during the drilling process, improving the adaptability of the drill bit under different geological conditions, and improving the drilling efficiency and stability.

[0032] Preferably, the drill body 2 is detachably arranged at the lower end of the drill rod 1 .

[0033] More preferably, a mounting block 5 is provided at the lower end of the drill rod 1, the drill body 2 includes a latch 201, a mounting portion 202 and a ground-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, an opening 2022 is provided at the upper end of the mounting portion 202, the opening 2022 is communicated with the mounting cavity 2021, a second through hole 2023 is provided in the horizontal direction of the mounting portion 202, the second through hole 2023 is communicated with the mounting cavity 2021, the mounting block 5 is inserted into the mounting cavity 2021 through the opening 2022, and the latch 201 is inserted into the second through hole 2023 and the first through hole 501 in sequence to fix the mounting portion 202 on the mounting block 5.

[0034] The drill body 2 is detachable, and the drill bit can be easily replaced or repaired during use. When the drill body 2 is worn or damaged, the user can quickly remove and replace the drill body 2 without replacing the entire drill bit structure, which greatly improves the efficiency of repair and maintenance, not only saving time but also reducing repair costs. The fixing structure between the mounting block 5 and the drill body 2 ensures a stable connection between the drill body 2 and the drill rod 1 through the cooperation of the latch 201, the first through hole 501 and the second through hole 2023, so that the mounting portion 202 is tightly matched with the mounting block 5 to prevent loosening or falling off during drilling, thereby ensuring the working stability and safety of the drill bit structure.

[0035] More preferably, a protective plate 6 is detachably provided in the installation cavity 2021 , and the protective plate 6 divides the installation cavity 2021 into a first cavity 20211 and a second cavity 20212 arranged up and down, the installation block 5 is accommodated in the first cavity 20211 , and the angle sensor 7 is accommodated in the second cavity 20212 .

[0036] Specifically, when the mounting block 5 is accommodated in the first cavity 20211 , the lower end of the mounting block 5 abuts against the upper end of the protection plate 6 .

[0037] The angle sensor 7 is arranged in the second cavity 20212, so that the working angle of the drill bit can be monitored in real time, and the working state of the drill bit can be adjusted according to the data fed back by the sensor, which helps to maintain the optimal angle of the drill bit during the drilling process, improve the 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 installation cavity 2021 into two upper and lower cavities, and the angle sensor 7 is placed in the second cavity 20212, which can effectively protect the angle sensor 7 from external impact and friction damage during drilling, avoid potential damage to the sensor caused by high temperature, vibration, etc. generated during drilling, and ensure the accuracy and long-term reliability of the angle sensor 7.

[0038] More preferably, the ground-breaking part 203 includes multiple drill plates 2031, which are in the shape of a right-angled trapezoid. The multiple drill plates 2031 are symmetrically arranged with the extension axis of the drill rod 1 as the center, and the right-angled sides of the drill plates 2031 are arranged at the lower end of the mounting part 202. The lower bottom sides of the multiple drill plates 2031 are welded together.

[0039] More preferably, the ground-breaking portion 203 further includes a plurality of second drilling teeth 20311 , and the plurality of second drilling teeth 20311 are disposed on the upper bottom edge and waist of the drilling plate 2031 .

[0040] The plurality of drill plates 2031 are symmetrically arranged with the extension axis of the drill rod 1 as the center, ensuring that the drill body 2 is subjected to uniform force during the drilling process. The symmetrical arrangement helps to maintain the stability and balance of the drill body 2, avoiding vibration or instability caused by asymmetric force distribution, thereby improving the drilling efficiency and accuracy. The second drill teeth 20311 arranged on the bottom edge and waist of the drill plate 2031 can effectively cut and break the strata during the drilling process, 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 layers, thereby improving the adaptability and versatility of the drill body 2.

[0041] In summary, an embodiment of the present invention provides a drill bit structure, wherein a plurality of pressure plates 401 are axially spaced apart and arranged on the drill blade assembly 3. During the drilling process, the drill body 2 breaks 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 toward the hole wall of the foundation pile hole, thereby increasing the compactness of the hole wall, thereby improving the stability of the foundation pile hole, reducing the risk in the hole forming process, and ensuring the quality of subsequent pile foundation construction; and the pressure plates 401 extend in the up and down directions to connect each layer of drill blades, which can effectively disperse the force generated during the drilling process, reduce the deformation and damage of the drill blades caused by excessive force, and thus extend the service life of the drill blades.

[0042] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A drill bit structure for drilling foundation pile holes, characterized in that: include: A drill rod (1), the drill rod (1) extending in an up-down direction; A drill body (2), the drill body (2) being arranged at the lower end of the drill rod (1); A drill blade assembly (3), wherein the drill blade assembly (3) is arranged on the outer peripheral wall of the drill rod (1); A pressure plate assembly (4), the pressure plate assembly (4) comprising a plurality of pressure plates (401) extending in an up-down direction, the plurality of pressure plates (401) being circumferentially spaced apart on the drill blade assembly (3) and located on a side close to an outer edge of the drill blade assembly (3) so as to squeeze soil on the hole wall of the foundation pile hole toward the hole wall.

2. The drill bit structure according to claim 1, characterized in that: 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) are in a double helical structure; the spiral radius of the outer edge of the main drill blade (301) and the outer edge of the auxiliary drill blade (302) are the same and remain unchanged in the axial direction of the drill rod (1); and the phase difference between the main drill blade (301) and the auxiliary drill blade (302) is 180°.

3. The drill bit structure according to claim 2, characterized in that: The pressing plate (401) has an extrusion surface (4011), and the extrusion surface (4011) faces the hole wall of the foundation pile hole. When viewed in the up-down direction, an extrusion angle (α) is formed between the extrusion surface (4011) of each pressing plate (401) and the outer edge tangent of the main drilling blade (301) opposite thereto, and the opening (2022) of the extrusion angle (α) faces in the opposite direction to the spiral rotation direction of the main drilling blade (301).

4. The drill bit structure according to claim 3, characterized in that: The extrusion angle (α) is in the range of 15° to 30°.

5. The drill bit structure according to claim 2, characterized in that: The lower end of the main drilling blade (301) has a first mounting line (3011), and the lower end of the auxiliary drilling 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 first mounting line (3011) and the second mounting line (3021) extend in the same direction. The first mounting line (3011) and the second mounting line (3021) are provided with a plurality of first drilling teeth (303) in their extending directions.

6. The drill bit structure according to claim 1, characterized in that: The drill body (2) is detachably arranged at the lower end of the drill rod (1).

7. The drill bit structure according to claim 6, characterized in that: 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 ground-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) and the mounting cavity (2021) are connected to each other. 21), the mounting portion (202) is provided with a second through hole (2023) in the horizontal direction, the second through hole (2023) is connected to the mounting cavity (2021), the mounting block (5) is inserted into the mounting cavity (2021) through the opening (2022), and the latch (201) is inserted into the second through hole (2023) and the first through hole (501) in sequence to fix the mounting portion (202) on the mounting block (5).

8. The drill bit structure according to claim 7, characterized in that: A protective plate (6) is detachably provided in the installation cavity (2021), and the protective plate (6) divides the installation cavity (2021) into a first cavity (20211) and a second cavity (20212) arranged vertically; the installation block (5) is accommodated in the first cavity (20211), and the second cavity (20212) contains an angle sensor (7).

9. The drill bit structure according to claim 7, characterized in that: The earth-breaking portion (203) comprises a plurality of drill plates (2031), the drill plates (2031) being in the shape of a right-angled trapezoid, the plurality of drill plates (2031) being symmetrically arranged around the extension axis of the drill rod (1), the right-angled sides of the drill plates (2031) being arranged at the lower end of the mounting portion (202), and the lower bottom sides of the plurality of drill plates (2031) being welded and connected.

10. The drill bit structure according to claim 9, characterized in that: The earth-breaking portion (203) further comprises a plurality of second drill teeth (20311), and the plurality of second drill teeth (20311) are arranged on the upper bottom edge and waist of the drill plate (2031).

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