Cutting tooth assembly type drill bit

Abstract

The invention belongs to the field of cutters, and provides a cutting tooth assembly type drill bit which comprises a drill bit body and four cutting teeth, a tooth holder table and a positioning table are arranged at the top of the drill bit body, four tooth holders distributed in a circular array around the positioning table are arranged on the side face of the positioning table, and the cutting teeth are obliquely arranged on the tooth holders. A plurality of circles of wear-resistant alloy single teeth are arranged on the tooth surfaces of the cutting teeth, circumferential wear-resistant surfacing bodies are arranged on the top surfaces of the cutting teeth, a tooth shaft obliquely extending towards the center direction of the positioning table is arranged in the center of the cutting teeth, the tooth shaft penetrates through the tooth holder, a retaining nut is arranged at the bottom end of the tooth shaft, and a tooth claw is arranged on the positioning table and comprises a claw sleeve body, tower-shaped teeth and a claw body; the top surfaces of the tower-shaped teeth are 1 / 2 higher than the vertical height of the cutting teeth; and the four claw bodies and the tooth holder are distributed at intervals. The rotary excavating device is reasonable in design, suitable for high-strength operation environments such as underground hard rocks and coal mines, high in rotary excavating capacity, high in comprehensive utilization rate and suitable for large-scale popularization.

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 processes a workpiece through impact force. The cutter drill bit with an assembled structure has a higher comprehensive utilization rate, such as a wing-type double-hole assembled drill bit disclosed in the existing patent CN218611838U, but the effective cutting surface of the drill bit is small, the rotary drilling capacity is insufficient, and it is not suitable for high-intensity working environments such as underground hard rock and coal mines. The double-acting cutter and PDC drill bit disclosed in the existing patent CN212317856U can achieve different rock breaking mechanisms in different areas on the working surface. The cutter can be designed and selected in different areas to break the rock according to different strata conditions. One tooth can achieve a variety of different rock breaking methods and can be used in different strata, which broadens the scope of use of the cutter; the cutting edge direction of the cutter can be adjusted and selected for different strata, which improves the utilization rate of the cutter. However, such a cutter drill bit is mostly made by casting, fusion welding, etc. If the local tooth shape is broken, it is generally scrapped as a whole for the sake of drill bit quality. This will reduce the actual utilization rate of the tool and increase the construction cost. Summary of the invention

[0003] In view of the technical problems existing in the above-mentioned cutting tooth drill bit, the present invention proposes a cutting tooth assembled drill bit with reasonable design, suitable for high-intensity working environments such as underground hard rock and coal mines, with strong rotary drilling ability 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: a cutting tooth assembly drill bit provided by the present invention comprises a drill bit body and 4 cutting teeth, a tooth seat platform is arranged on the top of the drill bit body, a positioning platform with a multi-step structure is arranged at the top center of the tooth seat platform, 4 tooth seats distributed in a circular array around the positioning platform are arranged on the side of the positioning platform, and positioning bolts connecting the tooth seat and the tooth seat platform are arranged in pairs on the tooth seat, the cutting teeth are arranged on the tooth seat obliquely, and multiple circles of wear-resistant alloy single teeth are arranged 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 obliquely extending 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, and 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, 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, and 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.

[0005] Preferably, the cutting tooth comprises a main tooth body, the side surface of the main tooth body comprises a plurality of axially connected conical surfaces, a plurality of circles of wear-resistant alloy single teeth are arranged on different conical surfaces, a mounting groove is arranged at the center of the cutting tooth, a top cone is arranged in the mounting groove, the top cone comprises a cone section and a column section, the circumferential wear-resistant cladding body is arranged on the cone section, and the column section is connected to the main tooth body by a quick clamp.

[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 installation groove, the first annular groove and the second annular groove correspond to each other and a pair of axially engaging 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 section, and 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, and the second shoulder is connected to the groove arranged at the bottom of the main tooth body through a flange bolt.

[0008] Preferably, the tooth seat is provided with a slot 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 slot.

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

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

[0011] Preferably, the root of the gear seat and the root of the claw protrusion are both inverted cones and are 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 cutting tooth assembly drill bit, which unitizes the cutting teeth and can be assembled on the tooth seat platform through the tooth seat, which not only has a sufficient rotary excavation working surface, but also is easy to install and replace, which is beneficial to improving the comprehensive utilization rate of the tool; in coordination with the four cutting teeth, the tooth claw can be assembled and installed in the center of the tooth seat platform, which can resist the hard rock and ore pressure from the rotary excavation center direction, which is beneficial to improving the overall rotary excavation 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 a strong rotary excavation capacity and a high comprehensive utilization rate, and is 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 briefly introduces 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 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 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 along the EE direction;

[0021] Figure 7 The exploded view of the cutting teeth, tooth seats and positioning bolts;

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

[0023] Fig. 9 This is the axonometric view of the claw;

[0024] In the above figures, 1, drill body; 2, cutting tooth; 21, wear-resistant alloy single tooth; 22, circumferential wear-resistant cladding 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, clamping 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 cladding 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 in conjunction with the accompanying drawings and embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict. For the convenience of description, if the words "upper", "lower", "left" and "right" appear below, they only indicate that the upper, lower, left and right directions are consistent with the accompanying 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 of the following disclosure.

[0027] Examples, such as Figure 1-9 As shown, a cutting tooth assembly drill bit provided by the present invention comprises a drill bit body 1 and four cutting teeth 2, wherein a tooth seat platform 3 is arranged on the top of the drill bit body 1, a positioning platform 4 with a multi-step structure is arranged 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 arranged on the side of the positioning platform 4, and positioning bolts 6 connecting the tooth seat 5 and the tooth seat platform 3 are arranged in pairs on the tooth seat 5, the cutting teeth 2 are arranged obliquely on the tooth seat 5, a plurality of circles of wear-resistant alloy single teeth 21 are arranged on the tooth surface of the cutting teeth 2, and a circumferential wear-resistant alloy is arranged on the top surface of the cutting teeth 2. A grinding and surfacing body 22, a gear shaft 23 obliquely extending toward the center direction of the positioning platform 4 is arranged at the center of the cutting tooth 2, the gear shaft 23 passes through the tooth seat 5 and a stop nut 24 is arranged at its bottom end, a tooth claw 7 is arranged on the positioning platform 4, the tooth claw 7 includes a claw sleeve body 71 nested with the table surface of the positioning platform 4, a tower-shaped tooth 72 is arranged 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, and four claw bodies 73 spaced apart from the tooth seat 5 are arranged on the side of the claw sleeve body 71, and 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 beneficial to improving the comprehensive utilization rate of the tool; the four cutting teeth 2 have sufficient rotary digging working surfaces, and their multi-circle wear-resistant alloy single teeth 21 and the 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 the 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, so that it is 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 platform 3, which can resist the pressure of hard rock and ore from the center direction of rotary drilling. Its tower-shaped teeth 72 can directly contact the rock of the rotary drilling layer to play a rotary drilling role, 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 improve the overall rotary drilling performance of the tool and extend the actual service life of the tool.

[0029] In order to improve the cutting performance of the cutting tooth 2, the cutting tooth 2 provided by the present invention includes a main tooth body 25, the side of the main tooth body 25 includes a plurality of axially connected conical surfaces, and a plurality of circles of the wear-resistant alloy single teeth 21 are arranged on different conical surfaces, wherein the conicity of the conical surface near the bottom is smaller than the conicity of the conical surface near the top, and adjacent conical surfaces are smoothly transitioned by chamfering. In this way, the wear-resistant alloy single teeth 21 located on different conical surfaces can effectively resist the impact force and friction force from different directions during the rotary drilling process, which is conducive to improving the rotary drilling performance of the tool.

[0030] In order to improve the assembly performance of the cutting tooth 2, the center of the cutting tooth 2 provided by the present invention is provided with an installation groove 26, a top cone 27 is provided in the installation groove 26, the top cone 27 includes a cone section 271 and a column section 272, the circumferential wear-resistant cladding body 22 is provided on the cone section 271, and the column section 272 is connected to the main tooth body 25 through a quick clamp 28. The top cone 27 can be assembled and installed on the top of the cutting tooth 2, and in the case of excessive wear and severe erosion, it can be disassembled 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 segment 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 penetrating the second annular groove 282 is arranged at the bottom of the main tooth body 25, and a ejector pin 284 engaged with its thread is arranged in the bolt hole. The ejector 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 two snap rings 283 can be effectively engaged with the side of the ejector pin 284, and a certain working gap between the snap ring 283 and the first annular groove 281 and the second annular groove 282 is maintained to buffer the impact force, so that the top cone 27 can be quickly connected to the main tooth body 25. After the ejector pin 284 is withdrawn from the inside of the main tooth body 25, the engagement pressure of the two snap rings 283 is small, and the top cone 27 can be ejected from the installation groove 26 by a quick punching method, thereby realizing the removal of the top cone 27.

[0032] Furthermore, the gear shaft 23 includes a central shaft body 231 that penetrates the gear seat 5 and the main tooth body 25 and is connected to the inside of the column section 272. The central shaft body 231 is provided with a first shaft shoulder 232 that matches the center of the main tooth body 25 and a second shaft shoulder 233 that matches the bottom of the main tooth body 25. The second shaft shoulder 233 is connected to a recessed groove provided at the bottom of the main tooth body 25 through a flange bolt. The diameters of the first shaft shoulder 232 and the second shaft shoulder 233 are both larger than the shaft diameter of the central shaft body 231, and the first shaft shoulder 232 and the second shaft shoulder 233 can increase the shear strength of the gear shaft 23 on the gear seat 5 and the main tooth body 25. The flange bolt connection method can realize the assembly connection, and the flange bolt is concealed in the assembly gap between the gear seat 5 and the main tooth body 25. The assembly gap can be filled with some grease, which can improve the continuous rotation performance of the cutting tooth 2 on the one hand, and play a sealing role on the other hand to avoid the extrusion and friction of rock debris.

[0033] In order to improve the assembly reliability of the tooth seat 5, the tooth seat 5 provided by the present invention is provided with a slot 51 on the side facing the positioning platform 4, and the side of the positioning platform 4 is provided with an annular protrusion 41 that cooperates with the slot 51. The direct contact frequency between the two and the rotary excavation working surface is much lower than that of the cutting tooth 2, and the scrap probability is low, so the positioning platform 4 and the tooth seat platform 3 are welded to present an integrated structure, and the slot 51 and the annular protrusion 41 can provide an effective axial positioning effect for the tooth seat 5, reduce the connection load of the positioning bolt 6, and improve the reliability of the tool assembly structure and the actual rotary excavation performance.

[0034] In order to reduce the wear of the tooth claw 7, the present invention provides a radial wear-resistant cladding body 74 distributed from the root of the tower tooth 72 to the tail of the claw body 73 on the top surface of the claw body 73, and the axial height of the claw body 73 gradually decreases from the root of the tower tooth 72 to the tail of the claw body 73, so as to facilitate the discharge of crushed stones. The radial wear-resistant cladding body 74 can be squeezed with the crushed stones entering between the cutting tooth 2 and the tooth claw 7, and the pressure at the extrusion position of the radial wear-resistant cladding body 74 is increased by high-speed motion, so as to promote further crushing of the crushed stones, and improve the efficiency of rapid discharge of the crushed stones on the basis of ensuring the effective wear life of the tooth claw 7.

[0035] In order to improve the assembly stability of the tooth claw 7, the tooth seat 3 provided by the present invention is provided with four evenly distributed clamping platform openings 31, the clamping platform openings 31 are spaced apart from the tooth seat 5, and the tail of the claw body 73 is provided with a claw protrusion 75 that cooperates with the clamping platform opening 31. The cross-sectional edge trajectory of the clamping platform opening 31 is parabolic, and the claw surface of the claw protrusion 75 is also a parabola and has an interference fit with the clamping platform opening 31, which can improve the grip of the tooth claw 7 on the tooth seat 3, reduce the probability of end swing and radial jump, and help improve the actual working performance of the entire tool.

[0036] Furthermore, the root of the tooth seat 3 and the root of the claw protrusion 75 are both inverted cones and are on the same inverted cone surface. On the one hand, it is beneficial to reduce the friction and wear of the tooth seat 3 and the claw protrusion 75. On the other hand, it can effectively reduce the probability of stone sticking to the root of the tooth seat 3, reduce the heat concentration area, reduce the probability of erosion, and help to extend the actual service life of the tool.

[0037] The above description is only a preferred embodiment of the present invention and does not limit the present invention in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes and apply it to other fields. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the protection scope 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: A tooth seat platform is arranged on the top of the drill bit body, and a positioning platform with a multi-step structure is arranged at the top center of the tooth seat platform, and four tooth seats distributed in a circular array around the positioning platform are arranged on the side of the positioning platform, and positioning bolts connecting the tooth seat and the tooth seat platform are arranged in pairs on the tooth seat, the cutting tooth is obliquely arranged on the tooth seat, and multiple circles of wear-resistant alloy single teeth are arranged on the tooth surface of the cutting tooth, and a circumferential wear-resistant cladding body is arranged on the top surface of the cutting tooth, and a tooth shaft obliquely extending toward the center direction of the positioning platform is arranged at the center of the cutting tooth, the tooth shaft passes through the tooth seat and a stop nut is arranged at the bottom end thereof, and a tooth claw is arranged on the positioning platform, and the tooth claw includes a claw sleeve body nested with the table surface of the positioning platform, and a tower-shaped tooth is arranged 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, and four claw bodies are arranged 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.

2. A cutting tooth assembly drill bit according to claim 1, characterized in that: The cutting tooth comprises a main tooth body, the side surface of the main tooth body comprises a plurality of axially connected conical surfaces, a plurality of circles of wear-resistant alloy single teeth are arranged on different conical surfaces, a mounting groove is arranged at the center of the cutting tooth, a top cone is arranged in the mounting groove, the top cone comprises a cone section and a column section, the circumferential wear-resistant cladding body is arranged on the cone section, and the column section is connected to the main tooth body by a quick clamp.

3. A cutting tooth assembly drill bit according to claim 2, characterized in that: 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 installation 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 engagement diameter of the two clamping rings.

4. A cutting tooth assembly drill bit according to claim 3, characterized in that: 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 section. 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 arranged at the bottom of the main tooth body through a flange bolt.

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

6. A 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.

7. The cutting tooth assembly drill bit according to claim 1, characterized in that: The gear seat platform is provided with four evenly distributed clamping platform openings, the clamping platform openings are spaced apart from the gear seat, and the tail of the claw body is provided with a claw protrusion matched with the clamping platform openings.

8. A cutting tooth assembly drill bit according to claim 7, characterized in that: The root of the tooth seat platform and the root of the claw projection are both inverted cones and are on the same inverted cone surface.

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