Cutting tooth assembled drill bit

Abstract

The present invention belongs to the field of cutting tools and proposes a cutting tooth assembly drill bit, comprising a drill bit body and four cutting teeth. The top of the drill bit body is provided with a tooth seat platform and a positioning platform. The side of the positioning platform is provided with four tooth seats distributed in a circular array around the positioning platform. The cutting teeth are tilted on the tooth seat. The tooth surface of the cutting teeth is provided with multiple rings of wear-resistant alloy single teeth. The top surface of the cutting teeth is provided with a circumferential wear-resistant cladding body. The center of the cutting teeth is provided with a tooth shaft extending obliquely toward the center of the positioning platform. The tooth shaft passes through the tooth seat and has a stop nut at its bottom end. The positioning platform is provided with a tooth claw. The tooth claw includes a claw sleeve, a tower tooth, and a claw body. The top surface of the tower tooth is higher than 1 / 2 of the vertical height of the cutting tooth. There are four claw bodies and they are spaced apart from the tooth seat. The present invention has a reasonable design, is suitable for high-intensity working environments such as underground hard rock and coal mines, has a strong rotary drilling capacity and a high comprehensive utilization rate, and is suitable for large-scale promotion.

Description

Technical Field

[0001] The invention belongs to the field of cutting tools, and in particular relates to a cutting tooth assembled drill bit. Background Art

[0002] An assembled drill bit is a device that uses impact force to process a workpiece. Cutting tooth drill bits with assembled structures have a high overall utilization rate. For example, the wing-type, dual-hole assembled drill bit disclosed in existing patent CN218611838U has a small effective cutting surface, insufficient rotary drilling capacity, and is unsuitable for high-intensity working environments such as underground hard rock and coal mines. Existing patent CN212317856U discloses dual-action cutters and PDC drill bits. Different areas on the working surface can achieve different rock-breaking mechanisms. Cutting teeth can be designed and selected to break rock in different areas according to different strata, allowing a single cutter to achieve multiple different rock-breaking methods and broaden the cutter's application range. The cutting edge direction of the cutter can be adjusted to suit different strata, improving cutter utilization. However, such cutter drill bits are often manufactured using methods such as casting or welding. If a localized tooth fracture occurs, the entire drill bit is typically scrapped for quality reasons. This reduces the actual tool utilization rate and increases construction costs. Summary of the Invention

[0003] In response to the technical problems existing in the above-mentioned cutting tooth drill bit, the present invention proposes a cutting tooth assembly drill bit with reasonable design, suitable for high-intensity working environments such as underground hard rock and coal mines, strong rotary drilling capability and high comprehensive utilization rate.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is as follows: the present invention provides a cutting tooth assembly drill bit, comprising a drill bit body and 4 cutting teeth, a tooth seat platform is provided on the top of the drill bit body, a positioning platform with a multi-step structure is provided at the top center of the tooth seat platform, 4 tooth seats distributed in a circular array around the positioning platform are provided on the side of the positioning platform, positioning bolts connecting the tooth seat and the tooth seat platform are provided in pairs on the tooth seat, the cutting teeth are arranged obliquely on the tooth seat, and multiple circles of wear-resistant alloy single teeth are provided on the tooth surface of the cutting teeth. The top surface of the cutting tooth is provided with a circumferential wear-resistant cladding body, and the center of the cutting tooth is provided with a tooth shaft extending obliquely toward the center direction of the positioning platform. The tooth shaft passes through the tooth seat and a stop nut is provided at the bottom end thereof. A tooth claw is provided on the positioning platform, and the tooth claw includes a claw sleeve body nested with the table surface of the positioning platform. A tower-shaped tooth is provided on the top of the claw sleeve body, and the top surface of the tower-shaped tooth is higher than 1 / 2 of the vertical height of the cutting tooth. Four claw bodies are provided on the side of the claw sleeve body, which are spaced apart from the tooth seat, and the two sides of the claw body are interference fit with the side surfaces of the tooth seat.

[0005] Preferably, the cutting tooth includes a main tooth body, the side surface of the main tooth body includes multiple axially connected conical surfaces, multiple circles of wear-resistant alloy single teeth are arranged on different conical surfaces, the center of the cutting tooth is provided with a mounting groove, a top cone is provided in the mounting groove, the top cone includes a cone section and a column section, the circumferential wear-resistant surfacing body is provided on the cone section, and the column section is connected to the main tooth body by a quick clamping part.

[0006] Preferably, the quick clamping part includes a first annular groove arranged on the side of the column segment and a second annular groove arranged in the mounting groove, the first annular groove and the second annular groove correspond to each other and a pair of axially engaged clamping rings are arranged therein, the minimum diameter of the two clamping rings after being engaged is smaller than the combined diameter of the first annular groove and the second annular groove and larger than the diameter of the first annular groove, the bottom of the main tooth body is provided with a bolt hole that passes through the second annular groove, the bolt hole is provided with a pin that cooperates with its thread, and the pin is used to control the engaging diameter of the two clamping rings.

[0007] Preferably, the gear shaft includes a central axis body that passes through the gear seat and the main tooth body and is connected to the inside of the column segment. The central axis body is provided with a first shoulder that cooperates with the center of the main tooth body and a second shoulder that cooperates with the bottom of the main tooth body. The second shoulder is connected to the groove provided at the bottom of the main tooth body through a flange bolt.

[0008] Preferably, the tooth seat is provided with a clamping groove on a side facing the positioning platform, and the side surface of the positioning platform is provided with an annular protrusion that cooperates with the clamping groove.

[0009] Preferably, the top surface of the claw body is provided with a radial wear-resistant surfacing body distributed from the pyramid tooth root to the claw body tail.

[0010] Preferably, the tooth seat platform is provided with four evenly distributed clamping platform openings, the clamping platform openings are spaced apart from the tooth seat, and the tail of the claw body is provided with a claw protrusion that cooperates with the clamping platform openings.

[0011] Preferably, the root of the gear seat and the root of the claw protrusion are both inverted cone-shaped and on the same inverted cone surface.

[0012] Compared with the prior art, the advantages and positive effects of the present invention are:

[0013] The present invention provides a drill bit with assembled cutting teeth. The cutting teeth are modularized and assembled on a tooth support platform via a tooth support. This not only provides a sufficient rotary drilling working surface, but also facilitates installation and replacement, thereby improving the comprehensive utilization rate of the tool. In conjunction with the four cutting teeth, the tooth claws can be assembled and mounted at the center of the tooth support platform to resist the pressure of hard rock and ore from the rotary drilling center, thereby improving the overall rotary drilling performance of the tool and extending the actual service life of the tool. The present invention has a reasonable design, is suitable for high-intensity working environments such as underground hard rock and coal mines, has strong rotary drilling capabilities and a high comprehensive utilization rate, making it suitable for large-scale promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0015] Figure 1 A front view of a cutting tooth assembly drill bit provided in an embodiment;

[0016] Figure 2 A cross-sectional view of a cutting tooth assembly drill bit provided in an embodiment taken along the GG direction;

[0017] Figure 3 An axonometric view of a cutting tooth assembly drill bit provided in an embodiment;

[0018] Figure 4 A side view of a cutting tooth assembly drill bit provided in an embodiment at a 45° angle;

[0019] Figure 5 A top view of a cutting tooth assembly drill bit provided in an embodiment;

[0020] Figure 6 A cross-sectional view of a cutting tooth assembly drill bit provided in an embodiment taken along the EE direction;

[0021] Figure 7 Exploded view of cutting teeth, tooth holders and positioning bolts;

[0022] Figure 8 This is the axonometric drawing of the gear holder and positioning table;

[0023] Figure 9 This is the axonometric drawing of the claw;

[0024] In the above figures, 1. drill bit body; 2. cutting tooth; 21. wear-resistant alloy single tooth; 22. circumferential wear-resistant surfacing body; 23. gear shaft; 231. center shaft body; 232. first shaft shoulder; 233. second shaft shoulder; 24. stop nut; 25. main tooth body; 26. mounting groove; 27. top cone; 271. cone section; 272. column section; 28. quick clamping part; 281. first annular groove; 282. second annular groove; 283. retaining ring; 284. ejector pin; 3. tooth seat platform; 31. clamping platform mouth; 4. positioning platform; 41. annular protrusion; 5. tooth seat; 51. clamping groove; 6. positioning bolt; 7. tooth claw; 71. claw sleeve body; 72. tower tooth; 73. claw body; 74. radial wear-resistant surfacing body; 75. claw protrusion. DETAILED DESCRIPTION

[0025] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described below with reference to the accompanying drawings and embodiments. It should be noted that the embodiments of the present application and the features therein can be combined with each other unless they conflict. For the convenience of description, the words "upper", "lower", "left", and "right" appearing below only indicate the upper, lower, left, and right directions consistent with the drawings themselves and do not limit the structure.

[0026] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0027] Examples, such as Figure 1-9 As shown, the present invention provides a cutting tooth assembly drill bit, comprising a drill bit body 1 and four cutting teeth 2, a tooth seat platform 3 is provided on the top of the drill bit body 1, a positioning platform 4 with a multi-step structure is provided at the top center of the tooth seat platform 3, four tooth seats 5 distributed in a circular array around the positioning platform 4 are provided on the side of the positioning platform 4, and positioning bolts 6 connecting the tooth seat 5 and the tooth seat platform 3 are provided in pairs on the tooth seat 5. The cutting teeth 2 are obliquely arranged on the tooth seat 5, and multiple circles of wear-resistant alloy single teeth 21 are provided on the tooth surface of the cutting teeth 2. The top surface of the cutting teeth 2 is provided with a circumferential wear-resistant A grinding surfacing body 22 is provided, and a gear shaft 23 is provided in the center of the cutting tooth 2, which extends obliquely toward the center of the positioning platform 4. The gear shaft 23 passes through the tooth seat 5 and a stop nut 24 is provided at its bottom end. A tooth claw 7 is provided on the positioning platform 4. The tooth claw 7 includes a claw sleeve body 71 that is nested with the table surface of the positioning platform 4. A tower-shaped tooth 72 is provided on the top of the claw sleeve body 71. The top surface of the tower-shaped tooth 72 is higher than 1 / 2 of the vertical height of the cutting tooth 2. Four claw bodies 73 are provided on the side of the claw sleeve body 71, which are spaced apart from the tooth seat 5. The two sides of the claw body 73 are interference fit with the side surfaces of the tooth seat 5.

[0028] Specifically, the cutting teeth 2 adopt a unitized design and can be assembled on the tooth seat 5, and the tooth seat 5 can be assembled on the tooth seat platform 3 through the positioning bolts 6, which is convenient for installation and replacement, and is conducive to improving the comprehensive utilization rate of the tool; the four cutting teeth 2 have sufficient rotary digging working surfaces, and their multi-ring wear-resistant alloy single teeth 21 and circumferential wear-resistant cladding body 22 can effectively improve the rotary digging, wear resistance and impact resistance of the cutting teeth 2, and have the ability to rotate. If this tool is installed on the cutter disc, it can also obtain the ability to revolve through the cutter disc, so that the tool can maintain a good rotary digging ability in underground rotary digging operations, thereby being suitable for application scenarios such as underground hard rock and ore mining. In coordination with the four cutting teeth 2, the tooth claw 7 can be assembled and installed in the center of the tooth seat 3, which can resist the pressure of hard rock and ore from the center of the rotary drilling. Its tower-shaped teeth 72 can directly contact the rock of the rotary drilling layer to play the role of rotary drilling, and the crushed stone and stone chips generated during the rotary drilling process can be discharged from between the claw body 73 and the tooth seat 5, which is beneficial to improving the overall rotary drilling performance of the tool and extending the actual service life of the tool.

[0029] To improve the cutting performance of the cutting teeth 2, the present invention provides cutting teeth 2 comprising a main tooth body 25, the side of which comprises multiple axially connected tapered surfaces. Multiple rings of wear-resistant alloy single teeth 21 are arranged on different tapered surfaces, wherein the taper of the bottom tapered surface is smaller than that of the top tapered surface, and adjacent tapered surfaces are smoothly rounded to each other. This allows the wear-resistant alloy single teeth 21 located on different tapered surfaces to effectively resist impact and friction forces from different directions during the rotary drilling process, thereby improving the rotary drilling performance of the present tool.

[0030] To improve the assembly performance of the cutting tooth 2, the cutting tooth 2 provided by the present invention is provided with a mounting groove 26 at its center. A top cone 27 is disposed in the mounting groove 26. The top cone 27 comprises a conical section 271 and a cylindrical section 272. The circumferential wear-resistant cladding body 22 is disposed on the conical section 271. The cylindrical section 272 is connected to the main tooth body 25 via a quick-connect fitting 28. The top cone 27 can be assembled and mounted on the top of the cutting tooth 2. In the event of excessive wear or severe erosion, it can be removed and replaced after shutdown.

[0031] Regarding the quick clamping part 28, specifically, the quick clamping part 28 includes a first annular groove 281 arranged on the side of the column section 272 and a second annular groove 282 arranged in the mounting groove 26. The first annular groove 281 and the second annular groove 282 correspond to each other and a pair of axially engaged snap rings 283 are arranged therein. The cross-section of the snap ring 283 is L-shaped, and the L-shaped openings of the two snap rings 283 are matched in reverse. The minimum diameter of the two snap rings 283 after being engaged is smaller than the combined diameter of the first annular groove 281 and the second annular groove 282 and larger than the diameter of the first annular groove 281. A bolt hole that passes through the second annular groove 282 is provided at the bottom of the main tooth body 25, and a pin 284 that is threadedly engaged with the bolt hole is provided in the bolt hole. The pin 284 is used to control the engaging diameter of the two snap rings 283. The ejector pin 284 is installed in the bolt hole from the bottom of the main tooth body 25 from bottom to top. When the top of the ejector pin 284 reaches the root of the bolt hole, the side of the ejector pin 284 can effectively engage the two retaining rings 283, and a certain working gap is maintained between the retaining rings 283 and the first annular groove 281 and the second annular groove 282 to cushion the impact force, thereby achieving a quick connection between the top cone 27 and the main tooth body 25. After the ejector pin 284 is withdrawn from the interior of the main tooth body 25, the engaging pressure of the two retaining rings 283 is reduced, and the top cone 27 can be ejected from the installation groove 26 by a quick ejection, thereby achieving the removal of the top cone 27.

[0032] Furthermore, the gear shaft 23 includes a central shaft body 231 that passes through the tooth holder 5 and the main tooth body 25 and is connected to the interior of the cylindrical section 272. The central shaft body 231 is provided with a first shoulder 232 that mates with the center of the main tooth body 25 and a second shoulder 233 that mates with the bottom of the main tooth body 25. The second shoulder 233 is connected to a recessed groove provided at the bottom of the main tooth body 25 via flange bolts. The diameters of the first shoulder 232 and the second shoulder 233 are both larger than the axial diameter of the central shaft body 231. The first shoulder 232 and the second shoulder 233 increase the shear strength of the gear shaft 23 on the tooth holder 5 and the main tooth body 25. The flange bolt connection achieves an assembled connection, and the flange bolts are concealed within the assembly gap between the tooth holder 5 and the main tooth body 25. This assembly gap can be filled with grease, which not only improves the continuous rotation performance of the cutting tooth 2 but also acts as a seal to prevent compression and friction from rock fragments.

[0033] To improve the assembly reliability of the tooth adapter 5, the tooth adapter 5 provided in the present invention is provided with a retaining groove 51 on the side facing the positioning platform 4. The side of the positioning platform 4 is provided with an annular protrusion 41 that mates with the retaining groove 51. Because the frequency of direct contact between the positioning platform 4 and the cutting tooth 2 with the drilling work surface is much lower than that with the cutting tooth 2, the probability of scrap is low. Therefore, the positioning platform 4 and the tooth adapter platform 3 are welded together to form an integrated structure. The retaining groove 51 and the annular protrusion 41 provide effective axial positioning for the tooth adapter 5, reducing the connection load of the positioning bolt 6, and improving the reliability of the tool assembly structure and the actual drilling performance.

[0034] To reduce wear on claw 7, the present invention features radial wear-resistant cladding 74 on the top surface of claw body 73, extending from the base of the pyramidal tooth 72 to the tail of claw body 73. The axial height of claw body 73 gradually decreases from the base of the pyramidal tooth 72 to the tail of claw body 73, facilitating the removal of gravel. The radial wear-resistant cladding 74 compresses gravel that enters between the cutting tooth 2 and claw 7. High-speed motion increases pressure at the point where the radial wear-resistant cladding 74 compresses, further crushing the gravel. This improves the efficiency of rapid gravel removal while ensuring the effective wear life of claw 7.

[0035] To enhance the assembly stability of the toothed claws 7, the tooth base 3 provided by the present invention is provided with four evenly spaced retaining openings 31 spaced apart from the tooth base 5. The tail of the claw body 73 is provided with a claw protrusion 75 that engages with the retaining openings 31. The cross-sectional edge of the retaining opening 31 is parabolic, while the claw surface of the claw protrusion 75 is also parabolic and provides an interference fit with the retaining opening 31. This improves the grip of the toothed claws 7 on the tooth base 3, reduces the probability of end runout and radial runout, and improves the actual working performance of the entire tool.

[0036] Furthermore, the base of the tooth support 3 and the base of the claw protrusion 75 are both inverted conical and on the same inverted conical surface. This not only helps reduce friction and wear between the tooth support 3 and the claw protrusion 75, but also effectively reduces the probability of stone sticking to the base of the tooth support 3, reduces the area of heat concentration, and reduces the probability of erosion, which helps to extend the actual service life of the tool.

[0037] The above description is merely a preferred embodiment of the present invention and does not constitute any other form of limitation to the present invention. Any person skilled in the art may utilize the technical contents disclosed above to change or modify them into equivalent embodiments with equivalent changes for application in other fields. However, any simple modification, equivalent change, and modification of the above embodiments made in accordance with the technical essence of the present invention without departing from the technical solution of the present invention shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A cutting tooth assembly drill bit, comprising a drill bit body and four cutting teeth, characterized in that: The top of the drill bit body is provided with a tooth seat platform, and the top center of the tooth seat platform is provided with a positioning platform of a multi-step structure, and the side of the positioning platform is provided with 4 tooth seats distributed in a circular array around the positioning platform, and positioning bolts connecting the tooth seat and the tooth seat platform are provided in pairs on the tooth seat, and the cutting teeth are inclinedly arranged on the tooth seat, and the tooth surface of the cutting teeth is provided with multiple circles of wear-resistant alloy single teeth, and the top surface of the cutting teeth is provided with a circumferential wear-resistant cladding body. The center of the cutting teeth is provided with a tooth shaft extending obliquely toward the center direction of the positioning platform, and the tooth shaft passes through the tooth seat and a stop nut is provided at the bottom end thereof. A tooth claw is provided on the positioning platform, and the tooth claw includes a claw sleeve body that is nested with the table surface of the positioning platform, and a tower-shaped tooth is provided on the top of the claw sleeve body, and the top surface of the tower-shaped tooth is higher than 1 / 2 of the vertical height of the cutting tooth. The side of the claw sleeve body is provided with 4 claw bodies spaced apart from the tooth seat, and the two sides of the claw body are interference fit with the side surfaces of the tooth seat; The cutting tooth comprises a main tooth body, the side surface of the main tooth body comprises a plurality of axially connected conical surfaces, multiple circles of wear-resistant alloy single teeth are arranged on different conical surfaces, a mounting groove is provided at the center of the cutting tooth, a top cone is provided in the mounting groove, the top cone comprises a cone section and a column section, the circumferential wear-resistant cladding body is provided on the cone section, and the column section is connected to the main tooth body via a quick-connect fitting; The quick-connect member includes a first annular groove provided on the side of the column segment and a second annular groove provided in the mounting groove. The first annular groove and the second annular groove correspond to each other and are provided with a pair of axially engaged snap rings. The minimum diameter of the two snap rings after being engaged is smaller than the combined diameter of the first and second annular grooves and larger than the diameter of the first annular groove. The bottom of the main tooth body is provided with a bolt hole that passes through the second annular groove. A pin that is threadably engaged with the bolt hole is provided in the bolt hole. The pin is used to control the engagement diameter of the two snap rings. The gear seat platform is provided with four evenly distributed card table openings, and the card table openings are spaced apart from the gear seat. The tail of the claw body is provided with a claw protrusion that cooperates with the card table opening. The cross-sectional edge trajectory of the card table opening is parabolic, and the claw surface of the claw protrusion is a parabola and has an interference fit with the card table opening. The root of the gear seat platform and the root of the claw protrusion are both inverted cones and are on the same inverted cone surface.

2. A cutting tooth assembly drill bit according to claim 1, characterized in that: The gear shaft includes a central axis body that passes through the gear seat and the main gear body and is connected to the inside of the column segment. The central axis body is provided with a first shaft shoulder that cooperates with the center of the main gear body and a second shaft shoulder that cooperates with the bottom of the main gear body. The second shaft shoulder is connected to the groove provided at the bottom of the main gear body through a flange bolt.

3. The cutting tooth assembly drill bit according to claim 1, characterized in that: The tooth seat is provided with a clamping groove on a side facing the positioning platform, and the side surface of the positioning platform is provided with an annular protrusion that cooperates with the clamping groove.

4. The cutting tooth assembly drill bit according to claim 1, characterized in that: The top surface of the claw body is provided with a radial wear-resistant surfacing body distributed from the pyramid tooth root to the claw body tail.

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