High-efficiency cutting long-life diamond rotary digging cutter and rotary drilling cylinder thereof

Abstract

A high-efficiency cutting long-life diamond rotary digging cutter and a rotary drilling cylinder thereof; the diamond rotary digging cutter comprises a cutter seat and a plurality of rotatable diamond composite pieces mounted on the cutter seat; a single rotatable diamond composite piece comprises a diamond polycrystal layer, a hard alloy and a welding body coaxially connected from top to bottom; the diamond polycrystal layer is fixedly connected with the hard alloy; the hard alloy is rotatably connected with the welding body; the top of the diamond polycrystal layer is coaxially provided with N layers of bosses, N≥1; the edges of each layer of the bosses and the edge of the diamond polycrystal layer are provided with cutting edges; all the cutting edges participate in cutting together, and can be rotated and replaced while cutting, greatly improving the utilization rate of the diamond polycrystal layer and the cutting efficiency of the cutting edges, and also improving the service life of the diamond composite piece; and the rotary drilling cylinder provided with the diamond rotary digging cutter can quickly cut hard bedrock by virtue of the improved cutting performance, thereby improving the working efficiency of hole forming operation.

Description

Technical Field

[0001] This invention relates to the technical field of rotary drilling rig accessories, and in particular to a high-efficiency, long-life diamond rotary drilling cutter tooth and its rotary drilling barrel. Background Technology

[0002] Rotary drilling rigs are construction machines suitable for hole-forming operations in building foundation engineering. They are primarily suitable for construction in soil layers such as sand, cohesive soil, and silty soil, and are widely used in various foundation constructions, including cast-in-place piles, continuous walls, and foundation reinforcement. Common rotary drilling rig bits include auger bits, rotary buckets, core drill bits, underreaming bits, impact drill bits, grab cone bits, and hydraulic grabs. Core drill bits, also known as rotary drilling barrels, are further divided into cutting tooth barrel drills and roller cone barrel drills. Cutting tooth barrel drills are suitable for medium-hard bedrock and gravel; roller cone barrel drills are suitable for hard bedrock and large boulders. Due to their inherent strength and service life, cutting tooth barrel drills cannot cut hard bedrock. Roller cone barrel drills actually achieve bedrock cutting through rolling, resulting in low cutting efficiency. Current technology cannot provide a cutting tooth barrel drill that efficiently cuts hard bedrock. Regarding the cutting teeth connected to the end of the cutting tooth barrel drill... While welding diamond composite sheets can improve cutting capabilities, the structure of diamond composite sheets welded to cutting teeth is often a cemented carbide layer covered with a bonded polycrystalline diamond layer. During cutting, only the outer polycrystalline diamond layer cutting edge makes contact, while the inner cutting edge is not fully utilized, resulting in low effective utilization of the polycrystalline diamond layer. Furthermore, the polycrystalline diamond layer often has only one cutting edge, limiting the cutting depth and reducing cutting efficiency. Welding also causes thermal damage to the diamond composite sheet, significantly shortening its service life. In summary, cutting teeth drills with welded diamond composite sheets still cannot efficiently and sustainably cut hard bedrock. Summary of the Invention

[0003] The purpose of this invention is to solve the above-mentioned problems and provide a high-efficiency, long-life diamond rotary drilling cutter tooth and its rotary drilling barrel.

[0004] The technical solution of the present invention is: a high-efficiency cutting long-life diamond rotary drilling cutter tooth, comprising a tooth base and several rotatable diamond composite sheets;

[0005] The upper part of the gear seat has a layout surface on one side; one side of the layout surface has an upwardly extending mounting surface; the mounting surface is evenly distributed with several mounting holes; the rotatable diamond composite sheet includes a diamond polycrystalline layer and a cemented carbide layer coaxially connected from top to bottom; the diamond polycrystalline layer and the cemented carbide layer are fixedly connected; the rotatable diamond composite sheet is rotatably connected to the mounting holes.

[0006] The top of the polycrystalline diamond layer has N layers of bosses coaxially arranged, where N≥1; each boss and the edge of the polycrystalline diamond layer are provided with cutting edges.

[0007] The lower end of the rotatable diamond composite sheet is inserted into the mounting hole; the lower part of the cemented carbide is provided with a tension groove; a tension spring is fitted inside the tension groove; the outer wall of the tension spring mates with the inner wall of the mounting hole.

[0008] Preferably, the rotatable diamond composite sheet also includes a weld body; the cemented carbide is rotatably connected to the weld body.

[0009] Preferably, the mounting hole is provided with a support block corresponding to the bottom of the rotatable diamond composite sheet; the support block is provided with a bucket-shaped unloading hole corresponding to the bottom of the rotatable diamond composite sheet.

[0010] Preferably, the high-efficiency, long-life diamond rotary drilling cutter teeth include inner cutter teeth and outer cutter teeth; the arrangement surface is an arc-shaped surface; the mounting surface of the inner cutter teeth is located on the left side of the arrangement surface; and the mounting surface of the outer cutter teeth is located on the right side of the arrangement surface.

[0011] Preferably, the tooth holders are arranged symmetrically front and back; the arrangement surface of the tooth holders is an inclined plane; the side of the tooth holders is provided with several support blocks C and side grinding blocks; the side grinding blocks are located on the edge of the side where the rotatable diamond composite sheet is located; the support blocks C are located in the middle; the position of the side grinding blocks corresponds to the position of the support blocks C; the number of support blocks C corresponds to the number of side grinding blocks.

[0012] Preferably, the toothed surface is provided with support blocks B that correspond one-to-one with the rotatable diamond composite sheets.

[0013] A rotary drilling barrel equipped with the aforementioned high-efficiency, long-life diamond rotary drilling cutter teeth includes a mounting ring fixed to the end and a plurality of high-efficiency, long-life diamond rotary drilling cutter teeth evenly arranged at the lower end of the mounting ring.

[0014] Preferably, the lower circumference of the mounting ring has mounting grooves that match the thickness of the high-efficiency, long-life diamond rotary drilling teeth.

[0015] A rotary drilling barrel equipped with the aforementioned high-efficiency, long-life diamond rotary drilling cutter teeth includes a mounting ring fixed to the end and a plurality of high-efficiency, long-life diamond rotary drilling cutter teeth evenly arranged at the lower end of the mounting ring.

[0016] Preferably, the lower end of the mounting ring is circumferentially distributed with several of the aforementioned high-efficiency, long-life diamond rotary drilling teeth; the bottom end of the tooth holder is provided with an insertion groove that is equivalent to the thickness of the mounting ring; the mounting ring is engaged in the insertion groove.

[0017] The beneficial effects of this invention are as follows: This invention provides a high-efficiency, long-life diamond rotary drilling cutter tooth and its rotary drilling barrel. The diamond rotary drilling cutter tooth includes a tooth base and several rotatable diamond composite plates mounted on the tooth base. Each rotatable diamond composite plate includes a diamond polycrystalline layer, cemented carbide, and a weld body coaxially connected from top to bottom. The diamond polycrystalline layer is fixedly connected to the cemented carbide; the cemented carbide and the weld body are rotatably connected. The top of the diamond polycrystalline layer has N layers of bosses coaxially arranged, where N≥1. Each boss edge and the edge of the diamond polycrystalline layer are provided with a cutting edge. All cutting edges participate in cutting together and can rotate during cutting, greatly improving the utilization rate of the diamond polycrystalline layer and the cutting efficiency of the cutting edges. Furthermore, the rotation of the diamond polycrystalline layer avoids localized temperature rise at a single location due to continuous cutting, allowing for timely cooling of the cutting edge and thus improving the service life of the diamond composite plate. The rotary drilling barrel equipped with this diamond rotary drilling cutter tooth can rapidly cut hard bedrock using its enhanced cutting performance, thereby improving the efficiency of hole drilling operations. Attached Figure Description

[0018] Figure 1 This is a sectional perspective view of Embodiment 1;

[0019] Figure 2 This is a perspective view of the rotatable diamond composite sheet in Example 1;

[0020] Figure 3 This is a three-dimensional view of the internal cutting teeth in Embodiment 2;

[0021] Figure 4 yes Figure 3 The main view;

[0022] Figure 5 This is a perspective view of the external cutting teeth described in Embodiment 2;

[0023] Figure 6 This is a cross-sectional perspective view of the rotatable diamond composite sheet in Example 2;

[0024] Figure 7 yes Figure 6 Axial sectional view;

[0025] Figure 8 This is a schematic diagram illustrating the working principle of the rotatable diamond composite sheet in Example 2;

[0026] Figure 9 This is a three-dimensional view of the high-efficiency, long-life diamond rotary drilling cutter teeth of Example 3;

[0027] Figure 10 This is a perspective view of Example 4;

[0028] Figure 11 This is a perspective view of Example 5;

[0029] Figure 12 This is a perspective view of Example 6;

[0030] In the diagram: 1. Tooth base, 11. Arrangement surface, 12. Mounting surface, 121. Mounting hole, 1211. Support block, 1212. Removal hole, 13. Avoidance slope, 2. Rotatable diamond composite sheet, 21. Diamond polycrystalline layer, 211. Boss, 212. Cutting edge, 22. Carbide, 221. Tensioning groove, 222. Tensioning snap ring, 23. Weld body, 31. Internal cutting tooth, 311. Support block A, 32. External cutting tooth, 41. Support block B, 42. Support block C, 43. Side grinding block, 44. Insertion groove, 5. Mounting ring, 51. Mounting groove.

[0031] Because of the mechanism at the top of the rotary drilling rig and Figure 10 resemblance, Figure 11 , 12 No longer displayed. Detailed Implementation

[0032] Example 1: See Figure 1-2 A high-efficiency, long-life diamond rotary drilling cutter tooth, comprising a tooth base and several rotatable diamond composite sheets;

[0033] The upper part of the gear seat has a layout surface on one side; one side of the layout surface has an upwardly extending mounting surface; the mounting surface is evenly distributed with a number of mounting holes; in this embodiment, there are a total of 8 mounting holes;

[0034] The rotatable diamond composite sheet includes a polycrystalline diamond layer, a cemented carbide, and a weld body coaxially connected from top to bottom; the polycrystalline diamond layer and the cemented carbide are fixedly connected; the rotatable diamond composite sheet is rotatably connected to the mounting hole;

[0035] The top of the polycrystalline diamond layer has N coaxially arranged bosses, where N ≥ 1; each boss and the edge of the polycrystalline diamond layer are provided with cutting edges. See [link to relevant documentation]. Figure 8 Together, they participate in the cutting of the bedrock; simultaneously, the rotatable connection between the cemented carbide and the welded body allows the reaction force received during cutting to rotate the cutting edge that has just participated in the cutting to the inside, and the cutting edge that has not participated in the cutting to the outside for cutting, thereby ensuring that every segment of the cutting edge can participate in the cutting process and improving the utilization rate of the diamond polycrystalline layer. At the same time, the cutting edge achieves rotation of the cutting part, thereby dissipating heat in time and avoiding excessive local temperature rise caused by continuous operation, which would affect the service life of the diamond polycrystalline layer; in this embodiment, N is 2;

[0036] The top surface of the gear holder is provided with a clearance slope that is opposite to the mounting cut surface; the slope of the clearance slope matches the orientation of the rotatable diamond composite sheet, so that the top surface of the gear holder will not interfere with the cutting of the rotatable diamond composite sheet.

[0037] The maximum radial cross-sectional profile of the diamond polycrystalline layer coincides with the maximum radial cross-sectional profile of the cemented carbide, and matches the radial cross-section of the upper end of the weld body, thereby avoiding interference from the cemented carbide and the weld body during cutting.

[0038] The lower end of the rotatable diamond composite sheet is inserted into the mounting hole to achieve a rotatable connection; the lower part of the cemented carbide is provided with a tension groove; a tension snap ring is fitted inside the tension groove; the outer wall of the tension snap ring mates with the inner wall of the mounting hole; the tension snap ring and the tension groove mate, and when the tension snap ring enters the weld body, the tension snap ring uses its own elastic force to lock the cemented carbide in the weld body, while not affecting the rotation of the cutting edge.

[0039] The cutting edge on the topmost boss has a greater inclination than the cutting edges of other bosses and the diamond polycrystalline layer, which makes it easier to compress the rock layer before other cutting edges, reducing the cutting difficulty of other cutting edges.

[0040] The mounting hole contains a support block corresponding to the bottom of the rotatable diamond composite sheet. This support block provides additional restraint to the bottom of the rotatable diamond composite sheet, pressing it down to facilitate cutting. The support block also has a funnel-shaped removal hole corresponding to the bottom of the rotatable diamond composite sheet. This removal hole is used to remove the rotatable diamond composite sheet. When the rotatable diamond composite sheet needs replacement, a columnar object is inserted through the removal hole to press down on the sheet, pushing it out of the mounting hole port, making removal very convenient. The funnel-shaped structure of the removal hole ensures both the restraint and support provided by the support block and guides the columnar object to press down on the sheet during removal. Furthermore, the funnel-shaped removal hole offers more flexibility in disassembling the columnar object, adapting to various situations encountered during removal.

[0041] The working process of Example 1:

[0042] Six rotatable diamond composite plates are mounted on the installation surface, with three plates forming a group to support the rock layers corresponding to the inner and outer sides of the tooth base. During cutting, the rock layers in front of the rotatable diamond composite plates are cut by the cutting edges of the diamond polycrystalline layer. In embodiment one, all three cutting edges of each rotatable diamond composite plate participate in the cutting process together. First, the cutting edge of the top boss squeezes and cuts the rock layer to reduce the cutting intensity of the latter two cutting edges, which then follow together. In this way, the inner cutting tooth can cut the rock layer thickness corresponding to the three cutting edges, greatly increasing the cutting efficiency. In addition, during the cutting process, the reaction force generated by the cutting edge drives the diamond polycrystalline layer to rotate. Thus, the cutting edges on the diamond polycrystalline layer can take turns cutting, greatly improving the utilization rate of the diamond polycrystalline layer. The cutting edge detached from the rock layer can dissipate heat. Furthermore, in this embodiment, the diamond composite plates are welded to the drive component, and the diamond polycrystalline layer is not subjected to heat damage, ensuring its service life. The working efficiency and service life of the entire diamond rotary drilling tooth are improved.

[0043] Example 2: See Figure 3-8 Example 2 is basically the same as Example 1, and the similarities will not be repeated. The difference is that the rotatable diamond composite sheet also includes a welding body; the cemented carbide and the welding body are rotatably connected; the welding body replaces the cemented carbide for welding, thereby avoiding heat damage to the rotatable diamond composite sheet and reducing its service life.

[0044] The high-efficiency, long-life diamond rotary drilling cutter teeth of Example 2 include inner and outer cutter teeth. Both the inner and outer cutter teeth in Example 2 use six rotatable diamond composite plates. The arrangement surface is arc-shaped, so that the six rotatable diamond composite plates can share the cutting pressure on the bedrock. The installation surface of the inner cutter tooth is located on the left side of the arrangement surface, and the installation surface of the outer cutter tooth is located on the right side of the arrangement surface. The inner and outer cutter teeth respectively undertake the cutting tasks inside and outside the rotary drilling barrel, so as to complete the cutting of the bedrock.

[0045] The inner and outer cutting teeth also include support blocks A, which correspond one-to-one with the rotatable diamond composite sheet. The support blocks A are installed on the arrangement surface and the top surface of the tooth seat, on the side opposite to the rotatable diamond composite sheet. When cutting complex formations, they support the inner and outer cutting teeth to prevent excessive intake and ensure a smooth cutting process.

[0046] The working process of Example 2: The inner and outer cutting teeth are symmetrical to each other, so the working process of Example 2 is mainly based on the working process of the inner cutting teeth, and the working process of the outer cutting teeth is referred to the working process of the inner cutting teeth.

[0047] When the internal cutting teeth perform cutting, six rotatable diamond composite plates set on the mounting cutting surface, in groups of three, respectively bear the rock layers corresponding to the end face and side face of the internal cutting teeth; during cutting, the rock layers in front of the rotatable diamond composite plates are cut by the cutting edges of the diamond polycrystalline layer; such as Figure 8 As shown in Embodiment 2, in this embodiment, all three cutting edges of each rotatable diamond composite sheet participate in the cutting process together. First, the cutting edge of the topmost boss squeezes and cuts the rock layer to reduce the cutting intensity of the latter two cutting edges, which then follow together. In this way, the internal cutting teeth can cut the rock layer thickness corresponding to the three cutting edges, greatly increasing the cutting efficiency. In addition, during the cutting process, the reaction force generated by the cutting edges drives the diamond polycrystalline layer to rotate. Thus, the cutting edges on the diamond polycrystalline layer can take turns cutting, greatly improving the utilization rate of the diamond polycrystalline layer. The cutting edges that detach from the rock layer can dissipate heat. Furthermore, in this embodiment, the diamond composite sheet is welded to the drive component, so the diamond polycrystalline layer is not subjected to heat damage, ensuring its service life. The working efficiency and service life of the entire diamond rotary drilling cutter are improved.

[0048] Example 3: See Figure 9 Example 3 is basically the same as Example 1, and the similarities will not be repeated. The difference is that the rotatable diamond composite sheet also includes a welding body; the cemented carbide and the welding body are rotatably connected; the welding body replaces the cemented carbide for welding, thereby avoiding heat damage to the rotatable diamond composite sheet and reducing its service life.

[0049] The tooth holders are symmetrically arranged front and rear, enabling the high-efficiency, long-life diamond rotary drilling teeth to simultaneously cut the rock strata. The tooth holder arrangement surface is an inclined plane, allowing the rotatable diamond composite sheet to primarily cut the rock strata at the end face. In Example 2, three rotatable diamond composite sheets are arranged front and rear. The arrangement surface is equipped with support blocks B corresponding to the rotatable diamond composite sheets, facilitating the support of the high-efficiency, long-life diamond rotary drilling teeth to cut complex rock strata. Several support blocks C and side grinding blocks are provided on the side of the tooth holder. The side grinding blocks are located at the edge of the side where the rotatable diamond composite sheet is located. Support blocks C are located in the middle. The position of support block C corresponds to the position of support block B. The position of the side grinding blocks corresponds to the position of support block C. The number of support blocks C and side grinding blocks corresponds. In Example 2, two support blocks C and two side grinding blocks are used. The side grinding blocks are mainly responsible for cutting the rock strata on the side of the tooth holder.

[0050] The working process of Example 3 is basically the same as that of Example 1, and will not be repeated here.

[0051] Example 4: See Figure 10A rotary drilling barrel equipped with the high-efficiency cutting long-life diamond rotary drilling cutter teeth as described in Embodiment 2, comprising a mounting ring fixed to the end and a plurality of high-efficiency cutting long-life diamond rotary drilling cutter teeth as described in Embodiment 2, evenly arranged at the lower end of the mounting ring.

[0052] The lower circumference of the mounting ring has mounting grooves that match the thickness of the high-efficiency cutting long-life diamond rotary drilling cutter teeth described in Example 2; the inner and outer cutter teeth are connected to the mounting grooves; the rotatable diamond composite sheet on the inner cutter tooth faces inward; the rotatable diamond composite sheet on the outer cutter tooth faces outward; in this way, the rotary drilling barrel can simultaneously cut the cutter layers on both the inner and outer sides of the barrel.

[0053] The working process of Example 4: Figure 10 As shown, in Embodiment 2, the inner and outer cutting teeth are distributed in a subcircular pattern at the lower end of the mounting ring; the number of inner and outer cutting teeth is 12 each; the working process of Embodiment 4 is that the inner and outer cutting teeth of Embodiment 2 work simultaneously; the rotatable diamond composite plate on the inner cutting tooth sends the cut rock layer into the rotary drilling barrel; the rotatable diamond composite plate on the outer cutting tooth sends the cut rock layer out of the rotary drilling barrel.

[0054] Example 5: See Figure 11 A rotary drilling barrel equipped with the high-efficiency cutting long-life diamond rotary drilling cutter teeth as described in Embodiment 1 includes a mounting ring fixed to the end and a plurality of high-efficiency cutting long-life diamond rotary drilling cutter teeth as described in Embodiment 1 evenly arranged at the lower end of the mounting ring.

[0055] The lower end of the mounting ring has several high-efficiency, long-life diamond rotary drilling teeth as described in Embodiment 1, distributed around its circumference; such as... Figure 12 As shown, the number of high-efficiency, long-life diamond rotary drilling cutter teeth is 56; the bottom end of the tooth holder is provided with an insertion groove with a thickness equivalent to that of the mounting ring; the mounting ring is inserted into the insertion groove to form a fixed connection; in this way, the rotary drilling cutter barrel can simultaneously cut the rock strata inside and outside the drill barrel.

[0056] The working process of Example 5: Figure 11 As shown, in Example 1, the high-efficiency cutting long-life diamond rotary drilling cutter teeth are circumferentially distributed at the lower end of the mounting ring, and there are 56 of them. In Example 5, the working process is that the 56 high-efficiency cutting long-life diamond rotary drilling cutter teeth of Example 1 work simultaneously. The high-efficiency cutting long-life diamond composite sheet of Example 1 simultaneously delivers the cut rock layer to the inside and outside of the rotary drilling barrel.

[0057] Example 6: See Figure 12 A rotary drilling barrel equipped with the high-efficiency cutting long-life diamond rotary drilling cutter teeth as described in Embodiment 3 includes a mounting ring fixed to the end and a plurality of high-efficiency cutting long-life diamond rotary drilling cutter teeth as described in Embodiment 3 evenly arranged at the lower end of the mounting ring.

[0058] The lower end of the mounting ring is circumferentially distributed with several high-efficiency, long-life diamond rotary drilling teeth as described in Embodiment 3; such as... Figure 12 As shown, the number of high-efficiency, long-life diamond rotary drilling cutter teeth is 56; the bottom end of the tooth holder is provided with an insertion groove with a thickness equivalent to that of the mounting ring; the mounting ring is inserted into the insertion groove to form a fixed connection; in this way, the rotary drilling cutter barrel can simultaneously cut the rock strata inside and outside the drill barrel.

[0059] The working process of Example 6: Figure 12 As shown, in Example 3, the high-efficiency cutting long-life diamond rotary drilling cutter teeth are circumferentially distributed at the lower end of the mounting ring, and there are 56 of them. In Example 6, the working process is that the 56 high-efficiency cutting long-life diamond rotary drilling cutter teeth of Example 3 work simultaneously. The high-efficiency cutting long-life diamond composite sheet of Example 3 simultaneously delivers the cut rock layer to the inside and outside of the rotary drilling barrel.

Claims

1. A high-efficiency cutting long-life diamond rotary excavating cutter tooth, characterized in that, It comprises a tooth holder and a plurality of rotatable diamond compact pieces. The upper side of the tooth holder is arranged with a mounting surface; one side of the mounting surface is provided with an upwardly extending mounting surface; the mounting surface is uniformly provided with a plurality of mounting holes; the rotatable diamond compact piece comprises a diamond polycrystal layer and a hard alloy coaxially connected from top to bottom; the diamond polycrystal layer is fixedly connected with the hard alloy; the rotatable diamond compact piece is rotationally connected with the mounting hole. The top of the diamond polycrystal layer is coaxially provided with N layers of bosses, N≥1; the edge of each layer of boss and the edge of the diamond polycrystal layer are provided with cutting edges; The lower end of the rotatable diamond compact piece is inserted into the mounting hole; the lower part of the hard alloy is provided with a tensioning groove; a tensioning spring is sleeved in the tensioning groove; the outer wall of the tensioning spring is matched with the inner wall of the mounting hole; a supporting block corresponding to the bottom of the rotatable diamond compact piece is arranged in the mounting hole; the supporting block is provided with a hopper-shaped dismounting hole corresponding to the bottom of the rotatable diamond compact piece; the tooth holder is symmetrically arranged front and back; the arrangement surface of the tooth holder is an inclined plane; the tooth holder is provided with a plurality of supporting blocks C and side grinding blocks; the side grinding blocks are arranged at the edge of the side where the rotatable diamond compact piece is located; the supporting blocks C are arranged in the middle; the positions of the side grinding blocks correspond to the positions of the supporting blocks C; the number of the supporting blocks C corresponds to the number of the side grinding blocks.

2. The high performance long life diamond rotary excavating cutter according to claim 1, wherein: The rotatable diamond compact piece further comprises a welding body; the hard alloy is rotationally connected with the welding body.

3. The high performance, long life, diamond rotary excavating cutter according to claim 2, wherein: It comprises inner and outer cutter teeth; the arrangement surface is an arc surface; the mounting surface of the inner cutter tooth is arranged on the left side of the arrangement surface; the mounting surface of the outer cutter tooth is arranged on the right side of the arrangement surface.

4. The high performance, long life, diamond rotary excavating cutter according to claim 1, wherein: The arrangement surface of the tooth holder is provided with a supporting block B corresponding to the rotatable diamond compact piece.

5. A rotary drilling cylinder mounted with the high-efficiency cutting long-life diamond rotary drilling cutter bit of claim 3, characterized in that: It comprises a mounting ring fixedly connected with the end portion and a plurality of high-efficiency cutting long-life diamond rotary digging cutter teeth uniformly arranged at the lower end of the mounting ring.

6. The rotary digger cylinder according to claim 5, wherein: The lower end of the mounting ring is circumferentially provided with mounting grooves matching the thickness of the high-efficiency cutting long-life diamond rotary digging cutter teeth.

7. A rotary drilling cylinder mounted with the high-efficiency cutting long-life diamond rotary drilling cutter bit of claim 1, characterized in that: It comprises a mounting ring fixedly connected with the end portion and a plurality of high-efficiency cutting long-life diamond rotary digging cutter teeth uniformly arranged at the lower end of the mounting ring.

8. The rotary digger cylinder according to claim 7, characterized in that: The lower end of the mounting ring is circumferentially provided with a plurality of high-efficiency cutting long-life diamond rotary digging cutter teeth according to claim 1; the bottom end of the tooth holder is provided with an insertion groove with a thickness corresponding to that of the mounting ring; the mounting ring is clamped into the insertion groove.

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