A spiral slag discharge drill bit and drilling rig

Abstract

This invention relates to the field of drilling construction technology and discloses a spiral slag-discharging drill bit and drilling rig. The drill bit includes a drill bit body and a slag removal assembly. The drill bit body includes an outer cylinder, a sealing plate, and an outer sheath. The sealing plate extends radially along the outer cylinder and is axially spaced from the bottom end of the outer cylinder. The outer sheath is coaxially sleeved on the outer periphery of the outer cylinder, and the inner wall of the outer sheath is connected to the outer edge of the sealing plate. The lower surface of the sealing plate, the bottom outer wall of the outer cylinder, and the inner wall of the outer sheath together form a slag-breaking chamber. The internal cavity of the outer cylinder forms a slag-lifting chamber, and at least one slag inlet is provided on the bottom side wall of the outer cylinder to connect the slag-breaking chamber and the slag-lifting chamber. The slag removal assembly includes a slag-discharging screw and at least two cutting blades. The slag-discharging screw rotates axially. The cutting blades are evenly distributed in the slag-breaking chamber along the circumference of the outer cylinder, and one end of each blade is connected to the bottom outer wall of the outer cylinder. The rotation direction of the cutting blades is opposite to the rotation direction of the slag-discharging screw to achieve synchronous soil removal during the drilling process.

Description

Technical Field

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

[0002] In the construction of infrastructure such as buildings, bridges, and power transmission towers, it is often necessary to form solid pile foundations underground. Drilled cast-in-place piles are one of the widely used foundation forms. Their construction first requires the use of specialized drilling rigs to drill pile holes of a specified diameter and depth in the foundation.

[0003] Currently, existing drilling rigs cannot effectively remove excavated soil during the soil and rock breaking process. For example, invention patent CN119572155B discloses a drilling equipment for power tower foundation piles and its soil removal method. This solution uses modular excavation equipment. During drilling, a power head drives a multi-stage segmented drill rod to rotate, and the drill bit is fixed at the bottom of the drill rod, using spiral blades to break the soil. When breaking harder rock and soil layers, the generated excavated soil is often lumpy, loose, and has poor flowability. The spiral blades of existing drill bits have limited guiding effect on this type of excavated soil, making it difficult to effectively collect and transport the excavated soil to the inlet in the center of the drill rod. This results in a large amount of excavated soil being trapped in the drilling process. Ineffective tumbling and repeated crushing at the bottom of the drill bit and between the blades prevent timely entry into the slag discharge channel, severely impacting slag discharge efficiency and even causing blockages, forcing a shutdown. Furthermore, the spiral blades themselves adhere to some slag during rotation. As drilling depth increases, more and more slag accumulates around the drill bit and on the blades, leading to a sharp increase in drill bit load and a decrease in effective drilling capacity. To restore drilling capacity, operators must frequently pull the entire drill string out of the hole to remove the accumulated slag before drilling back down to continue operations. This working mode significantly shortens drilling time and results in an excessively high proportion of auxiliary work time, severely affecting the overall efficiency of drilling operations. Summary of the Invention

[0004] The purpose of this invention is to provide a spiral slag removal drill bit and drilling rig, which effectively solves the problems of low slag removal efficiency, easy blockage, frequent drill lifting for slag removal, and low overall drilling efficiency of existing drilling rigs during drilling operations.

[0005] To achieve the above objectives, the present invention provides a spiral slag-discharging drill bit, comprising a drill bit body and a slag removal assembly. The drill bit body includes an outer cylinder, a sealing plate, and an outer sheath. The outer cylinder extends axially. The sealing plate extends radially along the outer cylinder, its inner edge connecting to the outer wall of the outer cylinder and spaced axially from the bottom end of the outer cylinder. The outer sheath is coaxially sleeved on the outer periphery of the outer cylinder, its inner wall connecting to the outer edge of the sealing plate, and its bottom end extending axially downward. The lower surface of the sealing plate, the outer wall of the bottom end of the outer cylinder, and the inner wall of the outer sheath together form a slag-breaking chamber. The internal cavity of the outer cylinder constitutes a slag-lifting chamber, and the bottom end of the outer cylinder... The side wall has at least one slag inlet connecting the slag crushing chamber and the slag lifting chamber; the slag removal assembly includes a slag discharge screw and at least two cutting blades; the slag discharge screw is disposed in the slag lifting chamber and is rotatable about the axial direction, and its rotation direction is configured to generate an axially upward conveying force in the slag lifting chamber; the cutting blades are evenly distributed in the slag crushing chamber along the circumference of the outer cylinder, and one end of each blade is connected to the bottom outer wall of the outer cylinder; each cutting blade has a guide surface, all the guide surfaces of the cutting blades face the same direction, and the rotation direction of the cutting blades is opposite to the rotation direction of the slag discharge screw, so as to convey the slag from the outer edge of the slag crushing chamber through the guide surface to the slag inlet.

[0006] In one embodiment, the slag discharge screw includes a core rod and a spiral guide vane wound around the outer periphery of the core rod and connected to the outer wall of the core rod.

[0007] In one embodiment, the slag discharge screw further includes a core fixing part, which is disposed at one end of the core rod near the slag crushing chamber. The core fixing part includes a plurality of centering plates that are evenly distributed circumferentially and converge toward the axial direction of the core rod. The lower edge of each centering plate has a downward and outward inclined surface, such that the plurality of centering plates together form a tip that is downward along the axial direction, and the surface of the inclined surface of the centering plate is provided with a first cutting tooth.

[0008] In one embodiment, the cutting blade is an arc-shaped blade, the guiding surface is its inner arc surface, and the surface of the inner arc surface is provided with a plurality of second cutting teeth, the axis of the second cutting teeth being inclined relative to the normal direction of the inner arc surface at the tooth mounting point.

[0009] In one embodiment, the cutting blade extends radially from one end of the outer cylinder to the inner wall adjacent to the outer sheath.

[0010] In one embodiment, the slag inlet is located on the motion trajectory path at the end of the guide surface of the cutting blade.

[0011] In one embodiment, the drill bit body further includes a plurality of reinforcing ribs, which are evenly distributed circumferentially on one end of the sealing plate away from the slag chamber, and one end of each reinforcing rib is connected to the outer side of the outer cylinder, and the other end is connected to the inner side of the outer sheath.

[0012] In one embodiment, the drill bit body further includes a plurality of third cutting teeth, which are circumferentially disposed at the bottom edge of the outer sheath, and the axis of the third cutting teeth forms an acute angle with the axis of the outer sheath.

[0013] Another aspect of the present invention provides a drilling rig, which includes the above-described spiral slag discharge drill bit, and also includes a base and a gantry frame; the gantry frame is fixedly connected to the top of the base, and the spiral slag discharge drill bit is disposed at the bottom of the base and connected to the gantry frame.

[0014] In one embodiment, the drilling rig further includes: The first motor is vertically mounted on the outer wall of the gantry frame. The output end of the first motor is used to connect to and drive the outer cylinder to rotate, thereby driving the cutting blade to rotate. The second motor is located above the first motor and can move up and down axially independently of the first motor. The output end of the second motor is used to connect to and drive the slag discharge screw to rotate, and the rotation direction of the slag discharge screw is opposite to the rotation direction of the outer cylinder.

[0015] Compared with existing technologies, the spiral slag removal drill bit and drilling rig of this invention have the following advantages: By setting up a slag removal assembly, a slag removal screw is installed in the slag lifting chamber, and cutting blades are installed in the slag crushing chamber, forming a two-stage coordinated slag removal mechanism of slag removal screw lifting and cutting blade conveying. During drilling, the slag removal screw continuously rotates around the axial direction, generating an upward conveying force in the axial direction within the slag lifting chamber, continuously discharging the slag entering the slag lifting chamber upwards. Simultaneously, the cutting blades rotate in the opposite direction to the slag removal screw, and their guide surfaces convey the slag from the outer edge of the slag crushing chamber inwards along a spiral path to the slag inlet, where it enters the slag lifting chamber and is lifted and discharged by the slag removal screw. The entire slag removal process is synchronized with the drilling process and does not require interruption. The drilling process involves frequent drilling and slag removal, fundamentally solving the technical problem of low overall drilling efficiency caused by repeated drilling and slag removal issues in existing drilling rigs. At least two cutting blades are evenly distributed circumferentially within the slag chamber along the outer cylinder, with their guide surfaces facing the same direction. This allows for the uniform circumferential collection and transport of slag within the slag chamber, preventing slag accumulation in localized areas. Simultaneously, the outer sheath extends axially downwards, effectively constraining the slag chamber radially and preventing slag from spreading outwards. This ensures that slag enters the slag inlet in an orderly manner under the guidance of the cutting blades. The continuous rotation of the slag discharge screw ensures timely discharge of slag from the slag lifting chamber, effectively eliminating the risk of slag blockage and guaranteeing the continuity and stability of drilling operations. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the spiral slag discharge drill bit according to an embodiment of the present invention; Figure 2 yes Figure 1 Enlarged view of point A in the middle; Figure 3 This is a schematic diagram of the spiral slag discharge drill bit from another angle according to an embodiment of the present invention; Figure 4 This is a bottom view of the spiral slag discharge drill bit according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of the spiral slag discharge drill bit for removing the outer cylinder according to an embodiment of the present invention; Figure 6 This is a front view of the spiral slag discharge drill bit according to an embodiment of the present invention; Figure 7 This is a cross-sectional view of the spiral slag discharge drill bit according to an embodiment of the present invention; Figure 8 This is a schematic diagram of a drilling rig according to an embodiment of the present invention; Figure 9 This is a schematic diagram of the gantry structure in the drilling rig according to an embodiment of the present invention; In the diagram, 100 represents the drilling rig. 10. Drill bit body; 11. Outer cylinder; 111. Slag inlet; 12. Sealing plate; 13. Outer sheath; 131. Third cutting tooth; 20. Slag removal assembly; 21. Slag discharge screw; 211. Core rod; 212. Spiral guide vane; 213. Core fixing part; 2131. Centering plate; 2132. First cutting tooth; 22. Cutting blade; 221. Second cutting tooth; 30. Reinforcing ribs; 40. Base; 50. Gantry frame; 60. First motor; 70. Second motor. Detailed Implementation

[0017] 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.

[0018] In the description of this invention, it should be understood that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on or indirectly on that other element. When an element is referred to as being "connected to" another element, it can be directly connected to or indirectly connected to that other element. The terms "mounted," "connected," and "attached" should be interpreted broadly, for example, referring to a fixed connection, a detachable connection, or an integral connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or a connection within two elements or an interaction between two elements. Those skilled in the art will understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0019] In the description of this invention, it should be understood that the terms "height," "upper," "lower," "vertical," "horizontal," "top," "bottom," "inner," and "outer" used in this invention to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0020] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature.

[0021] like Figures 1 to 9As shown, a preferred embodiment of the present invention provides a spiral slag removal drill bit, which includes a drill bit body 10 and a slag removal assembly 20. The drill bit body 10 includes an outer cylinder 11, a sealing plate 12, and an outer sleeve 13. The outer cylinder 11 extends axially. The sealing plate 12 extends radially along the outer cylinder 11, and its inner edge is connected to the outer wall of the outer cylinder 11 and is axially spaced from the bottom end of the outer cylinder 11. The outer sleeve 13 is coaxially sleeved on the outer periphery of the outer cylinder 11, and its inner wall is connected to the outer edge of the sealing plate 12, and its bottom end extends axially downward. The lower surface of the sealing plate 12, the outer wall of the bottom end of the outer cylinder 11, and the inner wall of the outer sleeve 13 together form a slag crushing chamber. The internal cavity of the outer cylinder 11 constitutes a slag lifting chamber. The outer cylinder 11 has at least one slag inlet 111 on its bottom side wall, which connects the crushing chamber and the slag lifting chamber. The slag removal assembly 20 includes a slag discharge screw 21 and at least two cutting blades 22. The slag discharge screw 21 is disposed in the slag lifting chamber and can rotate around the axial direction. Its rotation direction is configured to form an upward conveying force along the axial direction in the slag lifting chamber. The cutting blades 22 are evenly distributed in the crushing chamber along the circumference of the outer cylinder 11, and one end of each blade is connected to the bottom outer wall of the outer cylinder 11. The cutting blades 22 have a guide surface, and all the guide surfaces of the cutting blades 22 face the same direction. The rotation direction of the cutting blades 22 is opposite to the rotation direction of the slag discharge screw 21, so as to convey the slag from the outer edge of the crushing chamber to the slag inlet 111 through the guide surface.

[0022] Based on the above technical features, this invention, through the setting of the slag removal component 20, establishes a slag discharge screw 21 in the slag lifting chamber and a cutting blade 22 in the slag crushing chamber, forming a two-stage coordinated slag removal mechanism with the slag discharge screw 21 lifting and the cutting blade 22 conveying. During drilling, the slag discharge screw 21 continuously rotates around the axial direction, generating an upward conveying force in the axial direction within the slag lifting chamber, continuously discharging the slag entering the slag lifting chamber upward. At the same time, the cutting blade 22 rotates in the opposite direction to the slag discharge screw 21, and its guiding surface conveys the slag from the outer edge of the slag crushing chamber inward along a spiral path to the slag inlet 111, and then into the slag lifting chamber where it is lifted and discharged by the slag discharge screw 21. The entire slag removal process is synchronized with the drilling process, eliminating the need to interrupt drilling and frequently lift and remove the slag. The slag removal system fundamentally solves the technical problem of low overall drilling efficiency caused by repeated drilling and poor slag removal in existing drilling rigs 100. With at least two cutting blades 22 evenly distributed circumferentially within the slag chamber along the outer cylinder 11, their guide surfaces facing the same direction, the system can uniformly collect and transport the slag within the slag chamber, preventing slag accumulation in localized areas. Simultaneously, the outer sheath 13 extends axially downwards, effectively constraining the slag chamber radially and preventing slag from spreading outwards. This ensures that the slag enters the slag inlet 111 in an orderly manner under the guidance of the cutting blades 22. The continuous rotation of the slag discharge screw 21 ensures timely discharge of slag from the slag chamber, effectively eliminating the risk of slag blockage and guaranteeing the continuity and stability of drilling operations.

[0023] As some embodiments of the present invention, such as Figures 5 to 7 As shown, the slag discharge screw 21 includes a core rod 211 and a spiral guide vane 212 wound around the outer circumference of the core rod 211 and connected to the outer wall of the core rod 211. Through the design of the spiral guide vane 212, which is wound around the outer circumference of the core rod 211, compared to an integral screw structure with threads directly machined on the outer surface of the core rod 211, the spiral conveying channel formed after the spiral guide vane 212 connects to the outer wall of the core rod 211 is more prominent, continuous, and complete. The contact area between the slag and the spiral guide vane 212 is larger, and the gripping and pushing force of the spiral guide vane 212 on the slag is significantly enhanced. When the slag discharge screw 21 rotates, the spiral guide vane 212 forms a stable spiral conveying force in the upward axial direction within the slag lifting chamber, enabling the slag entering the slag lifting chamber to be continuously and efficiently lifted and discharged axially.

[0024] As some embodiments of the present invention, such as Figure 2 As shown, the slag discharge screw 21 also includes a core-setting part 213. The core-setting part is located at one end of the core rod 211 near the slag crushing chamber. The core-setting part 213 includes multiple centering plates 2131 that are evenly distributed circumferentially and converge toward the axis of the core rod 211. The lower edge of each centering plate 2131 has a downward and outward inclined surface, so that the multiple centering plates 2131 together form a downward-pointing tip along the axial direction. The surface of the inclined surface of the centering plate 2131 is provided with a first cutting tooth 2132. Through the design of the core-setting part 213, the downward-pointing tip formed by the multiple centering plates 2131 acts as a guide tip. When the slag discharge screw 21 moves downward and inserts into the ground, the tip contacts the ground first, which can smoothly guide the screw into the predetermined position, reduce the insertion resistance, and improve assembly efficiency and operation convenience. The inclined surface of the centering plate 2131 is provided with first cutting teeth 2132. During the rotation of the slag discharge screw 21, the first cutting teeth 2132 can cut and crush the soil residue remaining around the centering part 213, prevent the soil residue from blocking the centering plate 2131, further improve the slag discharge efficiency, ensure the smooth flow of the crushing chamber, and thus ensure the continuous and stable lifting of soil residue, playing the role of rock breaking and centering.

[0025] As some embodiments of the present invention, such as Figure 1 and Figure 4As shown, the cutting blade 22 is an arc-shaped blade with its inner arc surface as the guiding surface. Multiple second cutting teeth 221 are provided on the surface of the inner arc surface, and the axes of the second cutting teeth 221 are inclined relative to the normal direction of the inner arc surface at the tooth mounting point. By adopting an arc-shaped structure, the outer contour of the cutting blade 22 matches the curvature of the inner wall of the slag chamber. During the rotation of the outer cylinder 11, the arc-shaped blade can form line contact or large-area contact with the inner wall of the chamber, resulting in a larger and more uniform scraping range compared to the point contact of straight blades. The inclined arrangement of the second cutting teeth 221 generates an axial component force along the rotation direction of the cutting blade 22 during cutting. This component force actively pushes the cut slag axially towards the slag inlet 111, working in conjunction with the guiding function of the inner arc surface to achieve the cutting and pushing of the slag.

[0026] As some embodiments of the present invention, such as Figure 4 As shown, the cutting blade 22 extends radially from the end opposite to the outer cylinder 11 to the inner wall of the adjacent outer sheath 13. By extending radially outward from the surface of the outer cylinder 11 to the inner wall of the outer sheath 13, the space between the outer cylinder 11 and the outer sheath 13 is fully utilized, allowing the cutting blade 22 to cover the entire radial range of the slag chamber without leaving any dead corners for slag, further improving the crushing and collection effect of the slag removal assembly 20 on soil and slag.

[0027] As some embodiments of the present invention, such as Figure 4 As shown, the slag inlet 111 is located on the motion trajectory path of the end of the guide surface of the cutting blade 22. By setting the slag inlet 111 on the motion trajectory of the end of the guide surface, the end of the guide surface of the cutting blade 22 passes exactly through the slag inlet 111 during rotation. The soil and slag accumulated on the guide surface are actively pushed into the slag lifting chamber when they reach the slag inlet 111, achieving precise docking between the guide surface and the slag inlet 111. This avoids soil and slag accumulating at the end of the guide surface and failing to enter the slag inlet 111, significantly improving the slag feeding efficiency.

[0028] As some embodiments of the present invention, such as Figure 5 As shown, the drill bit body 10 also includes multiple reinforcing ribs 30, which are evenly distributed circumferentially on the end of the sealing plate 12 away from the slag chamber. One end of each reinforcing rib 30 is connected to the outer side of the outer cylinder 11, and the other end is connected to the inner side of the outer sheath 13. Through the design of the reinforcing ribs 30, one end of the reinforcing rib 30 is connected to the outer side of the outer cylinder 11, and the other end is connected to the inner side of the outer sheath 13, which rigidly bridges the outer cylinder 11 and the outer sheath 13 into one unit. This effectively prevents relative rotation, axial slippage, or radial separation between the two during operation, ensuring that the coaxiality and fitting accuracy between the components of the slag discharge screw 21 remain stable at all times, and avoiding slag discharge failure or equipment damage caused by component loosening or misalignment.

[0029] As some embodiments of the present invention, such as Figures 5 to 7As shown, the drill bit body 10 also includes multiple third cutting teeth 131, which are circumferentially arranged on the edge of the outer sheath 13. The axis of the third cutting teeth 131 forms an acute angle with the axis of the outer sheath 13. Through the design of the third cutting teeth 131, which are circumferentially arranged on the edge of the outer sheath 13, they are used to push the soil outside the cutting chamber into the cutting chamber, facilitating subsequent discharge of soil and debris. Furthermore, the acute angle between the axis of the third cutting teeth 131 and the axis of the outer sheath 13 allows the cutting edge of the third cutting teeth 131 to cut into the soil and debris in a shearing manner rather than a squeezing manner, significantly reducing cutting resistance, decreasing the torque load on the discharge screw, and saving energy.

[0030] On the other hand, such as Figures 8 to 9 The present invention also provides a drilling rig 100, which includes the aforementioned spiral slag-discharging drill bit, a base 40, and a gantry frame 50. The gantry frame 50 is fixedly connected to the top of the base 40, and the spiral slag-discharging drill bit is disposed at the bottom of the base 40 and connected to the gantry frame 50. Through the design of the gantry frame 50, which is fixedly connected to the top of the base 40, a portal frame support frame with high rigidity and small deformation is provided for the drill bit. The base 40, as a basic bearing platform, bears the entire weight of the gantry frame 50 and the spiral slag-discharging drill bit, as well as the axial pressure and torque reaction force generated during drilling, providing a stable mechanical foundation for the entire machine, effectively absorbing and dispersing vibration, and ensuring the smooth operation and reliability of the drilling rig 100 during long-term continuous operation.

[0031] As some embodiments of the present invention, such as Figure 9As shown, the drilling rig 100 also includes a first motor 60 and a second motor 70. The first motor 60 is vertically mounted on the outer wall of the gantry frame 50. The output end of the first motor 60 is used to connect to and drive the outer cylinder 11 to rotate, thereby driving the cutting blades 22 to rotate. The second motor 70 is located above the first motor 60 and can be independently raised and lowered along the axial direction. The output end of the second motor 70 is used to connect to and drive the slag discharge screw 21 to rotate, and the rotation direction of the slag discharge screw 21 is opposite to the rotation direction of the outer cylinder 11. Through the design of the first motor 60 and the second motor 70, the first motor 60 drives the outer cylinder 11 and the cutting blades 22, which are mainly responsible for scraping, guiding, and feeding slag. The second motor 70 drives the slag discharge screw 21 to rotate, which is responsible for discharging the slag. The two motors are functionally separated and each performs its own duties. By setting the second motor 70 above the first motor 60, the second motor 70 directly drives the slag discharge screw 21 downward, which minimizes the transmission path and reduces transmission loss and vibration. The first motor 60 and the second motor 70 can be set to different speeds, and the speed ratio can be flexibly adjusted to optimize the slag discharge effect. They can also be started and stopped independently, which improves the operational flexibility and safety. Both the first motor 60 and the second motor 70 can be independently raised and lowered along the axial direction. They can independently adjust the axial position of the outer cylinder and the slag discharge screw according to the drilling depth and formation changes, so that the scraping position of the cutting blade 22 and the crushing position of the slag discharge screw 21 always maintain the best matching relationship and accurately match different working conditions. The first motor 60 is placed on the outer wall of the gantry 50, which has good heat dissipation and is easy to maintain, and does not occupy the internal slag discharge space. The second motor 70 is placed above the first motor 60, with a short transmission path, compact layout and reasonable center of gravity.

[0032] In summary, the embodiments of the present invention provide a spiral slag-discharging drill bit and drilling rig. Compared with the prior art, its advantages are as follows: By setting the slag removal component 20, a slag-discharging screw 21 is installed in the slag-lifting chamber, and a cutting blade 22 is installed in the slag-crushing chamber, forming a two-stage coordinated slag-discharging mechanism with the slag-discharging screw 21 lifting and the cutting blade 22 conveying. During drilling, the slag-discharging screw 21 continuously rotates around the axial direction, generating an upward conveying force in the axial direction within the slag-lifting chamber, continuously discharging the slag entering the slag-lifting chamber upwards. Simultaneously, the cutting blade 22 rotates in the opposite direction to the slag-discharging screw 21, and its guiding surface conveys the slag from the outer edge of the slag-crushing chamber inwards along a spiral path to the slag inlet 111, where it enters the slag-lifting chamber and is lifted and discharged by the slag-discharging screw 21. The entire slag-discharging process is synchronized with the drilling process. This eliminates the need for frequent drilling and slag removal without interrupting drilling, fundamentally solving the technical problem of low overall drilling efficiency caused by repeated drilling and slag removal issues in existing drilling rigs. At least two cutting blades 22 are evenly distributed around the outer cylinder 11 within the slag chamber, with their guide surfaces facing the same direction, enabling uniform circumferential collection and transport of slag within the chamber, preventing slag accumulation in localized areas. Simultaneously, the outer sheath 13 extends downwards axially, effectively constraining the slag chamber and preventing slag from spreading outwards. This ensures that slag enters the slag inlet 111 in an orderly manner under the guidance of the cutting blades 22. The continuous rotation of the slag discharge screw 21 ensures timely discharge of slag from the slag chamber, effectively eliminating the risk of slag blockage and guaranteeing the continuity and stability of drilling operations.

[0033] 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 spiral slag discharge drill bit, characterized in that, include: The drill bit body includes an outer cylinder, a sealing plate, and an outer sheath. The outer cylinder extends axially; The sealing plate extends radially along the outer cylinder, its inner edge is connected to the outer wall of the outer cylinder, and is axially spaced from the bottom end of the outer cylinder. The outer sheath is coaxially sleeved on the outer periphery of the outer cylinder. The inner wall of the outer sheath is connected to the outer edge of the sealing plate, and its bottom end extends downward along the axial direction. The lower surface of the sealing plate, the bottom outer wall of the outer cylinder, and the inner wall of the outer sheath together form a slag crushing chamber. The internal cavity of the outer cylinder constitutes a slag lifting chamber, and at least one slag inlet is provided on the bottom side wall of the outer cylinder to connect the slag crushing chamber and the slag lifting chamber. A slag removal assembly, comprising a slag discharge screw and at least two cutting blades; The slag discharge screw is disposed in the slag lifting chamber and can rotate about the axial direction. Its rotation direction is configured to generate an axial upward conveying force in the slag lifting chamber. The cutting blades are evenly distributed in the slag crushing chamber along the circumference of the outer cylinder, with one end connected to the bottom outer wall of the outer cylinder; each cutting blade has a guide surface, all the guide surfaces of the cutting blades face the same direction, and the rotation direction of the cutting blades is opposite to the rotation direction of the slag discharge screw, so as to transport the slag from the outer edge of the slag crushing chamber to the slag inlet through the guide surface.

2. The spiral slag discharge drill bit according to claim 1, characterized in that, The slag discharge screw includes a core rod and a spiral guide vane wound around the outer periphery of the core rod and connected to the outer wall of the core rod.

3. The spiral slag discharge drill bit according to claim 2, characterized in that, The slag discharge screw also includes a core fixing part, which is disposed at one end of the core rod near the slag crushing chamber. The core fixing part includes a plurality of centering plates that are evenly distributed circumferentially and converge toward the axis of the core rod. The lower edge of each centering plate has a downward and outward inclined surface, so that the plurality of centering plates together form a tip that is downward along the axis. The surface of the inclined surface of the centering plate is provided with a first cutting tooth.

4. The spiral slag discharge drill bit according to claim 1, characterized in that, The cutting blade is an arc-shaped blade, the guiding surface is its inner arc surface, and the surface of the inner arc surface is provided with a plurality of second cutting teeth, the axis of the second cutting teeth being inclined relative to the normal direction of the inner arc surface at the tooth mounting point.

5. The spiral slag discharge drill bit according to claim 4, characterized in that, The cutting blade extends radially from the end opposite to the outer cylinder to the inner wall adjacent to the outer sheath.

6. The spiral slag discharge drill bit according to claim 5, characterized in that, The slag inlet is located on the motion trajectory path at the end of the guide surface of the cutting blade.

7. The spiral slag discharge drill bit according to claim 1, characterized in that, The drill bit body also includes multiple reinforcing ribs, which are evenly distributed circumferentially on one end of the sealing plate away from the slag chamber. One end of each reinforcing rib is connected to the outer side of the outer cylinder, and the other end is connected to the inner side of the outer sheath.

8. The spiral slag discharge drill bit according to claim 7, characterized in that, The drill bit body also includes a plurality of third cutting teeth, which are arranged circumferentially at the bottom edge of the outer sheath, and the axis of the third cutting teeth forms an acute angle with the axis of the outer sheath.

9. A drilling rig, characterized in that, The spiral slag discharge drill bit as described in any one of claims 1 to 8 includes a base and a gantry frame; The gantry frame is fixedly connected to the top of the base, and the spiral slag discharge drill bit is located at the bottom of the base and connected to the gantry frame.

10. The drilling rig according to claim 9, characterized in that, Also includes: The first motor is vertically mounted on the outer wall of the gantry frame. The output end of the first motor is used to connect to and drive the outer cylinder to rotate, thereby driving the cutting blade to rotate. The second motor is located above the first motor and can move up and down axially independently of the first motor. The output end of the second motor is used to connect to and drive the slag discharge screw to rotate, and the rotation direction of the slag discharge screw is opposite to the rotation direction of the outer cylinder.

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