Combined type drilling machine cutting tooth and tooth distribution structure for hard rock stratum

Abstract

The invention discloses a combined type drilling machine cutting tooth and tooth distribution structure for a hard rock stratum. The combined type drilling machine cutting tooth and tooth distribution structure comprises a cutting tooth column body, a working head, a buffering protection assembly, a connecting base and an internal reinforcing structure. The cutting tooth column body is of a cylindrical structure, the first end of the cutting tooth column body is connected with the working head, and the second end of the cutting tooth column body is connected with the connecting base through welding; the buffer protection assembly is arranged on the outer side wall of the cutting pick cylinder in a sleeving mode, the first end of the buffer protection assembly abuts against the end face of the working head, and the second end of the buffer protection assembly abuts against the end face of the connecting base; the internal reinforcing structure is embedded in an internal cavity of the cutting pick cylinder and extends in the axial direction of the cutting pick cylinder. The durability of the cutting pick is improved through buffer protection and an internal reinforcing structure, the working stability and precision are optimized by means of reasonable pick arrangement and positioning calibration, and various problems of traditional equipment are solved.

Description

Technical Field

[0001] This invention relates to the field of excavation and mining engineering, and in particular to a combined drilling rig cutting tooth and tooth arrangement structure for hard rock formations. Background Technology

[0002] In engineering fields such as mining and tunnel excavation, drilling operations in hard rock formations rely on drill bits and their matching tooth arrangement structure. Their performance directly affects operational efficiency and cost, and they are the core working components of the drilling rig. They are widely used in various hard rock formation construction scenarios and play a key supporting role in project progress.

[0003] In existing technologies, traditional drilling rig cutting teeth do not have a dedicated buffer and protection structure, making them prone to damage from excessive impact when operating in hard rock formations. Furthermore, the overall structural strength of the cutting teeth is insufficient, and the lack of effective internal reinforcement design often leads to breakage during high-intensity operations. At the same time, the uneven distribution or fixed connection of the cutting tooth mounting components in traditional tooth arrangement structures causes stress imbalance on the cutting teeth, which can easily lead to cutterhead failure. Moreover, the lack of precise positioning and calibration methods results in large installation deviations of the cutting teeth, which seriously affects the operation results. Therefore, a combined drilling rig cutting tooth and tooth arrangement structure for hard rock formations is proposed. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a combined drilling rig cutting tooth and tooth arrangement structure for hard rock formations, thereby solving the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a combined drilling rig cutting tooth and tooth arrangement structure for hard rock formations, comprising: The device comprises a cutting tooth column, a working head, a buffer and protective assembly, a connecting base, and an internal reinforcing structure. The cutting tooth column is cylindrical, with its first end connected to the working head and its second end welded to the connecting base. The buffer and protective assembly is fitted onto the outer wall of the cutting tooth column, with its first end abutting against the end face of the working head and its second end abutting against the end face of the connecting base. This buffering mechanism cushions the impact of hard rock formations on the cutting tooth column during operation, reducing the probability of damage and extending its service life. The internal reinforcing structure is embedded in the internal cavity of the cutting tooth column, extending axially along the column. Its first end extends into the working head, and its second end extends into the connecting base. This enhances the overall structural strength of the cutting tooth, improves its fracture resistance during operation in hard rock formations, and ensures stable operation.

[0006] Preferably, the working head is made of cemented carbide, and the end of the working head away from the cutting tooth column is a conical structure. The outer surface of the conical structure is provided with anti-slip texture, which is evenly distributed along the generatrix direction of the conical structure.

[0007] Preferably, the buffer protection assembly includes a buffer sleeve and an elastic component, wherein the buffer sleeve is fitted onto the outer wall of the cutting tooth column, and a gap is left between the buffer sleeve and the cutting tooth column; The elastic component is disposed in the internal cavity of the buffer sleeve. The elastic component is evenly distributed along the axial direction of the buffer sleeve. The first end of the elastic component is fixedly connected to the inner wall of the first end of the buffer sleeve, and the second end of the elastic component is fixedly connected to the inner wall of the second end of the buffer sleeve.

[0008] Preferably, the connecting base is made of high-strength steel, and a connecting hole is provided at the end of the connecting base away from the cutting tooth column. The inner wall of the connecting hole is provided with an internal thread structure, and the axis of the connecting hole is in the same straight line as the axis of the cutting tooth column.

[0009] Preferably, the internal reinforcing structure includes a support frame with a cross-shaped cross section. The outer surface of the support frame is in close contact with the inner wall of the cutting tooth column, and there is no gap between the support frame and the cutting tooth column.

[0010] Preferably, the cutting tooth column is made of alloy steel, and an anti-corrosion coating is provided on the outer surface of the cutting tooth column. The anti-corrosion coating completely covers the outer surface of the cutting tooth column, and the anti-corrosion coating is connected to the outer surface of the cutting tooth column by a tight adhesion method.

[0011] Preferably, the working head and the cutting tooth column are welded and fixedly connected, and a weld reinforcement layer is provided at the welding position. The weld reinforcement layer is arranged around the circumference of the welding position and completely covers the surface of the welding position.

[0012] Preferably, the buffer sleeve in the buffer protection assembly is made of rubber material, and the inner wall surface of the buffer sleeve is provided with anti-slip protrusions. The anti-slip protrusions are evenly distributed along the inner wall surface of the buffer sleeve, and the anti-slip protrusions abut against the outer surface of the cutting tooth column, with no gap between the anti-slip protrusions and the cutting tooth column.

[0013] A combined drill bit arrangement structure for hard rock formations, based on the aforementioned combined drill bit arrangement for hard rock formations, includes: Drilling rig cutterhead, cutting tooth mounting components, and positioning and calibration kits; The drill cutterhead has a disc-shaped structure. The cutting tooth mounting components are evenly distributed on the end face of the drill cutterhead along the circumference of the drill cutterhead. The cutting tooth mounting components are rotatably connected to the drill cutterhead, so that the cutting teeth are subjected to more uniform force during operation, reducing the possibility of drill cutterhead failure due to excessive local force, and improving the operational stability and service life of the drill cutterhead. Each cutting tooth mounting piece is equipped with a combined drilling rig cutting tooth, which is connected to the cutting tooth mounting piece via its own connecting base through a threaded connection. The positioning calibration component is set on the end face of the drill cutterhead. The positioning calibration component and the cutting tooth mounting component are in a one-to-one correspondence. The positioning calibration component is used to position and calibrate the installation position of the combined drill cutting tooth on the cutting tooth mounting component. This can ensure the accuracy of the cutting tooth installation position, avoid the impact of cutting tooth installation deviation on work efficiency and effect, and further improve the work quality of the drill in hard rock formations.

[0014] Preferably, the positioning calibration component includes a positioning pin and a positioning channel. The positioning channel is opened on the end face of the drill cutterhead, and the positioning pin is set on the end face of the connecting base of the combined drill cutting tooth. The positioning pin is adapted to the positioning channel. After the positioning pin is inserted into the internal cavity of the positioning channel, the installation and positioning between the combined drill cutting tooth and the cutting tooth mounting body is realized.

[0015] In summary, compared with the prior art, the present invention provides a combined drilling rig cutting tooth and tooth arrangement structure for hard rock formations, which has the following beneficial effects: This invention provides buffer protection for the cutting tooth column by sleeved with a buffer protection component on the outside of the cutting tooth column, which reduces the impact on the cutting tooth column when working in hard rock formations and solves the problem that traditional cutting teeth are easily damaged due to excessive impact. At the same time, by embedding an internal reinforcing structure inside the cutting tooth column and extending it to the working head and connecting base, the overall structural strength of the cutting tooth is improved, which enhances the fracture resistance of the cutting tooth and solves the problem that cutting teeth are easily broken due to insufficient strength when working in hard rock formations. By evenly distributing the cutting tooth mounting components along the circumference of the drilling rig cutterhead and rotating them with the cutterhead, the force is more uniform during cutting tooth operation, which improves the overall operational stability of the cutterhead and solves the problem of uneven force distribution in traditional tooth arrangement leading to easy cutterhead failure. By setting up a positioning and calibration component, the precise positioning of the cutting tooth installation position is achieved, which ensures the installation accuracy of the cutting tooth and improves the operation efficiency, solving the problem of the impact of cutting tooth installation deviation on the operation effect. Attached Figure Description

[0016] Figure 1 This is a three-dimensional diagram of a combined drilling rig cutting tooth structure for hard rock formations according to the invention.

[0017] Figure 2 This is a cross-sectional view of a combined drilling rig cutting tooth structure for hard rock formations according to the invention.

[0018] Figure 3 It is the invention. Figure 2 Enlarged view of a portion of region A in the middle.

[0019] Figure 4 This is a schematic diagram of a combined drilling rig tooth arrangement structure for hard rock formations according to the invention.

[0020] Figure 5 This is a three-dimensional view of a drill cutterhead for a combined drill tooth arrangement structure used in hard rock formations according to the invention.

[0021] Explanation of reference numerals in the attached figures: 1. Cutting tooth column; 2. Working head; 3. Connecting base; 4. Support frame; 5. Buffer sleeve; 6. Elastic component; 7. Connecting hole; 8. Anti-corrosion coating; 9. Weld reinforcement layer; 10. Anti-slip protrusion; 11. Drill cutter head; 12. Cutting tooth mounting component; 13. Positioning pin; 14. Positioning channel. Detailed Implementation

[0022] This invention provides a technical solution: a combined drilling rig cutting tooth and tooth arrangement structure for hard rock formations. Please refer to [link / reference]. Figure 1 , Figure 2 and Figure 3 ,include: The device comprises a cutting tooth column 1, a working head 2, a buffer protection assembly, a connecting base 3, and an internal reinforcing structure. The cutting tooth column 1 is a cylindrical structure. The first end of the cutting tooth column 1 is connected to the working head 2, and the second end of the cutting tooth column 1 is connected to the connecting base 3 by welding. The buffer protection assembly is sleeved on the outer wall of the cutting tooth column 1. The first end of the buffer protection assembly abuts against the end face of the working head 2, and the second end of the buffer protection assembly abuts against the end face of the connecting base 3. The internal reinforcing structure is embedded in the internal cavity of the cutting tooth column 1. The internal reinforcing structure extends along the axial direction of the cutting tooth column 1. The first end of the internal reinforcing structure extends into the interior of the working head 2, and the second end of the internal reinforcing structure extends into the interior of the connecting base 3. The elastic component 6 is made of spring steel, and its elastic coefficient is designed according to the actual working load of the drilling rig. It is generally selected in the range of 50-200N / mm to ensure that it can provide appropriate elastic buffering force during operation, effectively reduce the impact force on the working head 2, and at the same time ensure the stability and reliability of the buffer protection component. The cylindrical structure of the cutting tooth column 1 and its connection method with the working head 2 and the connecting base 3 ensure the stability of the structure and the firmness of the connection. The working head 2 is made of hard alloy material, with a conical structure and anti-slip texture design, which improves the rock breaking ability. The buffer sleeve 5 and elastic component 6 of the buffer protection component can effectively reduce impact and protect the cutting tooth. The high-strength steel material and internal thread structure of the connecting base 3 facilitate the connection with the cutting tooth mounting part 12. The internal reinforced support frame 4 enhances the strength of the cutting tooth column 1. The overall structure improves the performance and reliability of the drilling rig cutting tooth in hard rock formations.

[0023] Please see Figure 1 , Figure 2 and Figure 3 The working head 2 is made of cemented carbide. The end of the working head 2 away from the cutting tooth column 1 is a conical structure. The outer surface of the conical structure is provided with anti-slip texture, which is evenly distributed along the generatrix of the conical structure. The anti-slip texture has a triangular cross-section and is densely and evenly distributed along the generatrix of the conical structure to enhance the friction when the working head 2 comes into contact with the rock. The working head 2 is made of hard alloy material, which has high strength and good wear resistance. Its conical structure and evenly distributed anti-slip texture can enhance friction with the rock and improve crushing efficiency. The buffer sleeve 5 and elastic component 6 in the buffer protection component can effectively buffer the impact force during drilling and protect the cutting teeth. The internal reinforcement structure improves the overall strength of the cutting tooth column 1. The connecting base 3 facilitates connection with the cutting tooth mounting part 12. In the tooth arrangement structure, the cutting tooth mounting part 12 is rotatably connected to the drill cutter head 11. The positioning and calibration component ensures accurate installation position, which is conducive to stable and efficient operation of the drilling rig, reduces failures and wear, and improves construction quality and progress.

[0024] Please see Figure 1 , Figure 2 and Figure 3 The buffer protection assembly includes a buffer sleeve 5 and an elastic component 6. The buffer sleeve 5 is fitted onto the outer wall of the cutting tooth column 1, and a gap is left between the buffer sleeve 5 and the cutting tooth column 1. The elastic component 6 is disposed in the internal cavity of the buffer sleeve 5. The elastic component 6 is evenly distributed along the axial direction of the buffer sleeve 5. The first end of the elastic component 6 is fixedly connected to the inner wall of the first end of the buffer sleeve 5, and the second end of the elastic component 6 is fixedly connected to the inner wall of the second end of the buffer sleeve 5. The spring constant can be selected according to the actual working force to ensure that it can play a good buffering role. During installation, first fix one end of the spring in the preset groove on the inner wall of one end of the buffer sleeve 5, and then fix the other end in the groove on the inner wall of the other end to ensure that the spring is evenly distributed and the connection is stable. The working head 2 is made of hard alloy material, with a conical shape and anti-slip texture to improve rock breaking ability; the buffer sleeve 5 and elastic component 6 of the buffer protection component work together to effectively buffer the impact force during operation and protect the cutting teeth; the internal reinforced support frame 4 enhances the strength of the cutting tooth column 1; the connecting base 3 facilitates connection with the cutting tooth mounting component 12; in the tooth arrangement structure, the cutting tooth mounting component 12 on the drill cutter head 11 and the combined drill cutting teeth are connected by threads, and the positioning pin 13 and positioning channel 14 of the positioning calibration component achieve precise positioning and installation, improve drilling efficiency and accuracy, and ensure smooth construction.

[0025] Please see Figure 1 , Figure 2 and Figure 3 The connecting base 3 is made of high-strength steel. The end of the connecting base 3 away from the cutting tooth column 1 is provided with a connecting hole 7. The inner wall of the connecting hole 7 is provided with an internal thread structure. The axis of the connecting hole 7 is in the same straight line as the axis of the cutting tooth column 1. The elastic component 6 is evenly distributed along the axial direction in the cavity inside the buffer sleeve 5 according to the overall buffering requirements of the buffer protection assembly. Its elastic coefficient is selected according to the magnitude of the impact force generated during drilling of hard rock layers, so as to effectively absorb and reduce the impact and ensure the stability of the cutting tooth during operation. The connecting base 3 is made of high-strength steel, possessing high strength and good toughness, capable of withstanding the enormous forces during drilling in hard rock formations, and is not easily damaged. The connecting hole 7, located at the end away from the cutting tooth column 1, has an internal thread structure on its inner wall, and its axis is aligned with the axis of the cutting tooth column 1. This design allows the combined drilling rig cutting tooth to be securely connected to the cutting tooth mounting component 12 through threaded engagement, facilitating installation and disassembly. At the same time, the aligned design ensures uniform force transmission, reduces the offset and shaking of the cutting tooth during operation, improves drilling efficiency and the service life of the cutting tooth, and ensures the overall stability and reliability of the drilling rig.

[0026] Please see Figure 1 , Figure 2 and Figure 3 The internal reinforcing structure includes a support frame 4, the cross-section of which is a cross-shaped structure. The outer surface of the support frame 4 is tightly fitted with the inner wall of the cutting tooth column 1, and there is no gap between the support frame 4 and the cutting tooth column 1. During processing, the support frame 4 is first placed into the internal cavity of the cutting tooth column 1. The hydraulic device applies uniform and appropriate pressure to the support frame 4 so that its outer side contacts the inner wall of the cutting tooth column 1. At the same time, a high-precision laser measuring instrument is used to monitor the gap between the two in real time and continuously adjust the pressure until a tight fit without gap is achieved, ensuring that the support frame 4 is stably embedded in the cutting tooth column 1. The cross-shaped structure of the support frame 4 effectively enhances the strength and rigidity of the cutting tooth column 1, enabling it to better withstand huge impact forces and torques during drilling in hard rock formations, reducing the risk of deformation and damage to the cutting tooth column 1; the tight fit without gaps ensures effective force transmission, avoids stress concentration caused by gaps, and improves the overall structural stability; at the same time, this design facilitates processing and installation, improves production efficiency, reduces manufacturing costs, and provides reliable protection for drilling rigs operating in hard rock formations.

[0027] Please see Figure 1 , Figure 2 and Figure 3 The cutting tooth column 1 is made of alloy steel. The outer surface of the cutting tooth column 1 is provided with an anti-corrosion coating 8. The anti-corrosion coating 8 completely covers the outer surface of the cutting tooth column 1. The anti-corrosion coating 8 is connected to the outer surface of the cutting tooth column 1 by a tight adhesion method. When the cutting tooth column 1 is made of alloy steel, the alloy steel raw material with appropriate composition and performance can be selected according to the design requirements. The blank of the specified shape can be made by forging or casting. Then, the required dimensional accuracy can be achieved by fine processing such as cutting. The anti-corrosion coating 8 is made of a coating with strong corrosion resistance. After the surface pretreatment (such as rust removal, grinding, etc.) is performed on the outer side of the cutting tooth column 1, the coating is evenly covered on the outer side of the cutting tooth column 1 by spraying or brushing. The coating is then cured to make it adhere tightly. The cutting tooth column 1 is made of alloy steel, which has high strength and good toughness, ensuring that the cutting tooth column 1 can withstand large forces during drilling in hard rock formations without being easily damaged. Its outer surface is covered with a completely and tightly adhered anti-corrosion coating 8, which can effectively prevent the cutting tooth column 1 from being corroded in complex and harsh drilling environments and extend its service life. The connecting base 3 is made of high-strength steel, which can stably connect other components. The working head 2 is made of hard alloy material, and its conical structure and anti-slip texture are conducive to rock breaking. The buffer protection component can buffer the impact force. The internal reinforcing structure enhances the strength of the cutting tooth column 1. The positioning and calibration component ensures accurate installation of the cutting tooth, and improves the overall performance and reliability of the drilling rig cutting tooth.

[0028] Please see Figure 1 , Figure 2 and Figure 3 The working head 2 is welded and fixedly connected to the cutting tooth column 1. A weld reinforcement layer 9 is provided at the welding position. The weld reinforcement layer 9 is arranged around the circumference of the welding position and completely covers the surface of the welding position. During welding, the contact surfaces of the working head 2 and the cutting tooth column 1 are first cleaned and pretreated to ensure that there is no oil or impurities. Then, high-strength welding is carried out. During the welding process, the temperature and pressure are controlled to ensure that the weld is uniform. After welding, a layer of wear-resistant and corrosion-resistant alloy powder is coated on the weld surface. After heat treatment, a weld reinforcement layer 9 is formed, which completely covers the welding position and enhances the connection strength and durability. The working head 2 and the cutting tooth column 1 are fixed by welding, and a weld reinforcement layer 9 is set around the welding position. This structure significantly enhances the overall strength and stability of the cutting tooth. The welding fixation ensures a tight connection between the working head 2 and the cutting tooth column 1, making it less prone to loosening or falling off. The weld reinforcement layer 9 further improves the wear resistance and corrosion resistance of the welded part, effectively extending the service life of the cutting tooth. This design enables the cutting tooth to better withstand impact and friction during drilling in hard rock formations, maintain efficient and stable drilling performance, and improve drilling efficiency and success rate.

[0029] Please see Figure 1 , Figure 2 and Figure 3 The buffer sleeve 5 in the buffer protection assembly is made of rubber. The inner wall surface of the buffer sleeve 5 is provided with anti-slip protrusions 10. The anti-slip protrusions 10 are evenly distributed along the inner wall surface of the buffer sleeve 5. The anti-slip protrusions 10 abut against the outer side surface of the cutting tooth column 1. There is no gap between the anti-slip protrusions 10 and the cutting tooth column 1. Rubber with a Shore hardness of 60-70 can be selected. Rubber in this hardness range can ensure that the buffer sleeve 5 has sufficient elasticity to achieve the buffer function, and also ensure that it has a certain strength and is not easily damaged by excessive compression during use, so as to better adapt to the complex working environment when drilling hard rock formations. The combined drilling rig cutting teeth and tooth arrangement structure for hard rock formations has many advantages; the cutting tooth column 1 is made of alloy steel and has an anti-corrosion coating 8, which enhances its corrosion resistance and extends its service life; the working head 2 is made of hard alloy and has anti-slip texture, and its conical structure is conducive to rock breaking; in the buffer protection component, the rubber buffer sleeve 5, together with the elastic component 6, can effectively buffer the drilling impact force, and the anti-slip protrusion 10 ensures a stable fit with the cutting tooth column 1 and reduces wear; the internal support frame 4 enhances the strength of the cutting tooth column 1; the connecting base 3 facilitates installation, and the positioning and calibration component ensures accurate installation of the cutting teeth; the overall structure improves the stability and reliability of the drilling rig when operating in hard rock formations.

[0030] A combined drill bit arrangement structure for hard rock formations, based on the aforementioned combined drill bit arrangement for hard rock formations, please refer to [link to relevant documentation]. Figure 1 , Figure 2 , Figure 4 and Figure 5 ,include: Drilling rig cutterhead 11, cutting tooth mounting component 12 and positioning calibration assembly; The drill cutter head 11 has a disc-shaped structure. The cutting tooth mounting parts 12 are evenly distributed on the end face of the drill cutter head 11 along the circumference of the drill cutter head 11. The cutting tooth mounting parts 12 are rotatably connected to the drill cutter head 11. Each cutting tooth mounting component 12 is equipped with a combined drilling rig cutting tooth, which is connected to the cutting tooth mounting component 12 via its own connecting base 3 through a threaded connection. The positioning calibration component is set on the end face of the drill cutter head 11. The positioning calibration component and the cutting tooth mounting component 12 are in one-to-one correspondence. The positioning calibration component is used to position and calibrate the installation position of the combined drill cutting tooth on the cutting tooth mounting component 12. When the positioning and calibration component is working, first align the positioning pin 13 on the end face of the connecting base 3 of the combined drilling rig cutting tooth with the corresponding positioning hole 14 on the end face of the drilling rig cutter head 11, and slowly insert the positioning pin 13 into the cavity inside the positioning hole 14. During this process, observe the fit between the positioning pin 13 and the positioning hole 14 to ensure that the positioning pin 13 is fully inserted without jamming, thereby achieving precise installation and positioning between the combined drilling rig cutting tooth and the cutting tooth mounting component 12. The drill cutterhead 11 is disc-shaped, with cutting tooth mounting pieces 12 evenly distributed and rotatably connected along its circumference. This layout allows the cutting teeth to be subjected to more even force during operation, improving overall working stability. Each cutting tooth mounting piece 12 is equipped with a combined drill cutting tooth, which is connected to the cutting tooth mounting piece 12 via a threaded connection with the connecting base 3, facilitating installation and disassembly, maintenance, and tooth replacement. The positioning and calibration components correspond one-to-one with the cutting tooth mounting pieces 12, accurately positioning and calibrating the installation position of the combined drill cutting teeth on the cutting tooth mounting pieces 12, ensuring the accuracy of the cutting tooth installation position, thereby improving the efficiency of the drill when operating in hard rock formations and extending the service life of the cutting teeth, ensuring the reliability and stability of the drill operation.

[0031] Please see Figure 1 , Figure 2 , Figure 4 and Figure 5 The positioning and calibration component includes a positioning pin 13 and a positioning channel 14. The positioning channel 14 is opened on the end face of the drill cutter head 11, and the positioning pin 13 is set on the end face of the connecting base 3 of the combined drill cutting tooth. The positioning pin 13 is adapted to the positioning channel 14. After the positioning pin 13 is inserted into the internal cavity of the positioning channel 14, the installation and positioning between the combined drill cutting tooth and the cutting tooth mounting component 12 is realized. Before the positioning pin 13 is inserted into the positioning channel 14, an appropriate amount of grease can be applied to the surface of the positioning pin 13 to reduce the friction during insertion and ensure the stability of positioning. The depth of the positioning channel 14 can be set to one-third to one-half of the height of the connecting base 3 according to the actual installation requirements to ensure that the combined drilling rig cutting teeth are installed and positioned accurately and firmly. The positioning and calibration assembly includes a positioning pin 13 and a positioning channel 14. The positioning channel 14 is located on the end face of the drill cutterhead 11, and the positioning pin 13 is located on the end face of the connecting base 3 of the combined drill cutting teeth, and the two are compatible. This design allows the combined drill cutting teeth to be quickly and accurately positioned when installed on the cutting tooth mounting component 12 by inserting the positioning pin 13 into the positioning channel 14. This improves installation efficiency and accuracy, avoids deviations that may occur during manual installation, ensures the stability and reliability of the drill cutting teeth during operation, and thus improves the overall working performance and operation quality of the drill, providing a strong guarantee for drilling in hard rock formations.

[0032] Working principle: The cutting tooth column 1 is a cylindrical structure. Its first end is welded and fixed to the working head 2, and its second end is welded and connected to the connecting base 3. The internal reinforcing structure is embedded in the internal cavity of the cutting tooth column 1 and extends along the axial direction. Its two ends extend into the working head 2 and the connecting base 3 respectively to enhance the overall strength. During operation, the working head 2, made of cemented carbide, directly contacts the hard rock layer. The cutting tooth column 1, made of alloy steel, transmits the drilling force. The connecting base 3 cooperates with the external structure through the internally threaded connecting hole 7 to ensure stable operation of the cutting tooth. The buffer protection component is fitted onto the outer wall of the cutting tooth column 1. A gap is left between the buffer sleeve 5 and the cutting tooth column 1. The anti-slip protrusion 10 abuts against the outer wall of the cutting tooth column 1 to prevent displacement. The elastic component 6 is evenly distributed along the axial direction of the buffer sleeve 5 and is fixed at both ends to the inner wall of the buffer sleeve 5. When the cutting tooth is impacted by rock strata, the buffer sleeve 5 initially buffers the impact, and the elastic component 6 further absorbs the impact force. The two ends of the component abut against the end faces of the working head 2 and the connecting base 3, respectively, forming comprehensive protection. Cutting tooth mounting pieces 12 are evenly distributed around the end face of the drill cutterhead 11. Each mounting piece is equipped with one cutting tooth, and the cutting tooth is fixed to the mounting piece by the threaded engagement of the connecting base 3. The positioning and calibration components correspond one-to-one with the cutting tooth mounting pieces 12. The positioning channel 14 is opened on the end face of the drill cutterhead 11, and the positioning pin 13 is set on the end face of the connecting base 3. After the pin is inserted into the channel, it is accurately positioned to ensure the accurate installation position of the cutting tooth and ensure the overall drilling efficiency.

Claims

1. A combined drilling rig cutting tool for hard rock formations, characterized in that, include: The toothed column (1), working head (2), buffer protection assembly, connecting base (3), and internal reinforcing structure are provided. The first end of the toothed column (1) is connected to the working head (2), and the second end of the toothed column (1) is connected to the connecting base (3) by welding. The buffer protection assembly is sleeved on the outer wall of the toothed column (1). The first end of the buffer protection assembly abuts against the end face of the working head (2), and the second end of the buffer protection assembly abuts against the end face of the connecting base (3). The internal reinforcing structure is embedded in the internal cavity of the toothed column (1). The internal reinforcing structure extends along the axial direction of the toothed column (1). The first end of the internal reinforcing structure extends into the interior of the working head (2), and the second end of the internal reinforcing structure extends into the interior of the connecting base (3). The buffer protection assembly includes a buffer sleeve (5) and an elastic component (6). The buffer sleeve (5) is fitted onto the outer wall of the cutting tooth column (1). There is a gap between the buffer sleeve (5) and the cutting tooth column (1). The elastic component (6) is disposed in the internal cavity of the buffer sleeve (5). The elastic component (6) is evenly distributed along the axial direction of the buffer sleeve (5).

2. The combined drilling cutter for hard rock formations according to claim 1, characterized in that: The end of the working head (2) away from the cutting tooth column (1) is a conical structure. The outer surface of the conical structure is provided with anti-slip texture, which is evenly distributed along the generatrix direction of the conical structure.

3. A combined drilling cutter for hard rock formations according to claim 1, characterized in that: The first end of the elastic component (6) is connected to the inner wall of the first end of the buffer sleeve (5), and the second end of the elastic component (6) is connected to the inner wall of the second end of the buffer sleeve (5).

4. A combined drilling cutter for hard rock formations according to claim 1, characterized in that: The connecting base (3) has a connecting hole (7) at one end away from the cutting tooth column (1). The inner wall of the connecting hole (7) is provided with an internal thread structure. The axis of the connecting hole (7) is in the same straight line as the axis of the cutting tooth column (1).

5. A combined drilling cutter for hard rock formations according to claim 1, characterized in that: The internal reinforcing structure includes a support frame (4), the cross-section of which is a cross-shaped structure. The outer side of the support frame (4) is closely fitted with the inner wall of the cutting tooth column (1), and there is no gap between the support frame (4) and the cutting tooth column (1).

6. A combined drilling cutter for hard rock formations according to claim 1, characterized in that: The outer surface of the cutting tooth column (1) is provided with an anti-corrosion coating (8), and the anti-corrosion coating (8) is connected to the outer surface of the cutting tooth column (1).

7. A combined drilling cutter for hard rock formations according to claim 1, characterized in that: The working head (2) is welded and fixedly connected to the cutting tooth column (1). A weld reinforcement layer (9) is provided at the welding position. The weld reinforcement layer (9) is arranged around the circumference of the welding position and covers the surface of the welding position.

8. A combined drilling cutter for hard rock formations according to claim 1, characterized in that: The inner wall of the buffer sleeve (5) is provided with anti-slip protrusions (10). The anti-slip protrusions (10) are evenly distributed along the inner wall of the buffer sleeve (5). The anti-slip protrusions (10) abut against the outer side of the cutting tooth column (1). There is no gap between the anti-slip protrusions (10) and the cutting tooth column (1).

9. A combined drill bit arrangement structure for hard rock formations, based on a combined drill bit for hard rock formations as described in any one of claims 1-8, characterized in that, include: Drilling rig cutterhead (11), cutting tooth mounting component (12), and positioning and calibration assembly; The cutting tooth mounting component (12) is evenly distributed on the end face of the drill cutter head (11) along the circumferential direction of the drill cutter head (11), and the cutting tooth mounting component (12) is rotatably connected to the drill cutter head (11). The positioning calibration component is disposed on the end face of the drill cutter head (11). The positioning calibration component is used to calibrate the installation position of the combined drill cutting teeth on the cutting tooth mounting component (12).

10. A combined drilling rig tooth distribution structure for hard rock formations according to claim 9, characterized in that: The positioning calibration component includes a positioning pin (13) and a positioning channel (14). The positioning channel (14) is opened on the end face of the drill cutter head (11), and the positioning pin (13) is set on the end face of the connecting base (3) of the combined drill cutting teeth. The positioning pin (13) is adapted to the positioning channel (14).

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