High-pressure grouting drill bit

Abstract

The utility model relates to the technical field of high-pressure jet grouting piles, in particular to a high-pressure grouting drill bit. The drill bit comprises a drill bit body, an inner side barrel, a plurality of outer side assembly holes, a plurality of inner side assembly holes, a slurry nozzle, a limiting block and an assembly module. The drill body is installed at the bottom end of the drill rod. The top of the inner cavity of the inner side barrel body is communicated with the inner cavity of the drill rod. The outer assembly holes are formed in the peripheral wall of the drill bit body, and the inner assembly holes are correspondingly formed in the peripheral wall of the inner barrel. The slurry nozzle is movably inserted into the outer side assembly hole, and the tail end of the slurry nozzle corresponds to the inner side assembly hole in position. The limiting block is fixed to the tail end of the spray head and located in an interlayer between the drill bit body and the inner side barrel. The drill bit body and the inner side barrel are fixedly assembled to the bottom end of the drill rod through the assembling module. According to the device, the limiting block is matched with the assembly hole, the tail end of the spray head is fixedly restrained in an interlayer between the drill bit body and the inner side barrel, and the problem that in the prior art, the spray head is loosened under continuous radial impact is effectively solved.

Description

Technical Field

[0001] This utility model relates to the field of high-pressure jet grouting pile technology, and in particular to a high-pressure grouting drill bit. Background Technology

[0002] High-pressure grouting drill bits, also known as high-pressure jet grouting drill bits, are one of the core components of high-pressure jet grouting technology. Their core function is to inject high-pressure grout into the formation and mix it with the soil to form a solidified body. This process is mainly achieved by lateral jetting of grout through a grout nozzle fixed to the sidewall of the drill bit. For ease of equipment maintenance, existing high-pressure grouting drill bits typically use a threaded assembly method to tighten and fix the grout nozzle to the drill bit body. For example, the high-pressure rotary jet grouting drill bit disclosed in Chinese utility model patent CN212837598U uses a threaded assembly method to fix the jet nozzle to the drill bit body.

[0003] However, during the drilling process, the slurry nozzle is subjected to continuous radial impact loads, which can easily lead to slight relative slippage (i.e., loosening) between the threaded parts, causing the nozzle preload to gradually decrease. Without manual intervention, the slurry nozzle can easily become loose. Utility Model Content

[0004] To address the technical problems existing in the prior art, this utility model provides a high-pressure grouting drill bit, comprising:

[0005] The drill bit body is located at the bottom of the external drill rod;

[0006] The inner cylinder is movably set in the inner cavity of the drill bit body. The shape of the inner cylinder matches the inner cavity of the drill bit body, and the top port of the inner cylinder is connected to the inner cavity of the drill pipe.

[0007] Several outer mounting holes are formed on the circumferential sidewall of the drill bit body;

[0008] Several inner assembly holes are provided on the circumferential sidewall of the inner cylinder, and the several inner assembly holes are provided in a one-to-one correspondence with the several outer assembly holes.

[0009] Several slurry nozzles are movably inserted into several outer assembly holes, and the tail ends of several slurry nozzles are respectively matched with the positions of several inner assembly holes.

[0010] Several limiting blocks are fixedly installed at the tail ends of several slurry nozzles. The limiting blocks are located between the inner cylinder and the drill bit body and are used to limit the slurry nozzles.

[0011] The assembly module is located at the bottom end of the drill pipe. The assembly module is connected to the drill bit body and the inner cylinder and is used to fix the drill bit body and the inner cylinder to the bottom end of the drill pipe.

[0012] Furthermore, the slurry nozzle includes:

[0013] The first nozzle body is movably inserted into the outer mounting hole. The first nozzle body is a tubular component. The tail end of the first nozzle body matches the position of the inner mounting hole. The limiting block is fixedly sleeved on the tail end of the first nozzle body.

[0014] A sealing ring is fitted onto the first nozzle body and is fixedly connected to the limiting block. The sealing ring is located between the limiting block and the inner wall of the drill bit body and is used to seal the gap between the limiting block and the inner wall of the drill bit body.

[0015] Furthermore, the slurry nozzle also includes:

[0016] The second nozzle body is movably inserted into the inner cavity of the first nozzle body. The tail end of the second nozzle body is inserted into the inner mounting hole. The second nozzle body is an externally threaded tube, and the first nozzle body is an internally threaded tube. The second nozzle body is threadedly connected to the first nozzle body.

[0017] A drive groove is provided on the end face of the second nozzle body, which is connected to the inner cavity of the second nozzle body and is used to drive the second nozzle body to rotate.

[0018] Furthermore, the inner cavity of the inner mounting hole is frustum-shaped, and the inner diameter of the port of the inner mounting hole facing the inner wall of the drill bit body is smaller than the inner diameter of the port of the inner mounting hole facing away from the inner wall of the drill bit body. The tail end shape of the second nozzle body matches the inner cavity shape of the inner mounting hole.

[0019] Furthermore, the assembly module includes:

[0020] The flange joint assembly is located at the connection between the drill bit body and the drill pipe, and is used to fix the drill bit body to the bottom end of the drill pipe.

[0021] The first flange of the flange joint assembly is fixedly installed at the top of the drill bit body. The first flange is arranged radially along the drill bit body. The central axis of the first flange is collinear with the central axis of the drill bit body. The top of the inner cylinder is movably inserted into the inner cavity of the first flange.

[0022] The second flange of the flange joint assembly is fixedly installed at the bottom end of the drill pipe, and the central axis of the second flange is collinear with the central axis of the drill pipe;

[0023] Several first assembly slots are formed on the top end face of the first flange, and the several first assembly slots are arranged in a circular array around the central axis of the first flange.

[0024] Several second assembly slots are formed on the top end face of the inner cylinder. Several second assembly slots are located on the circumferential outer edge of the top end face of the inner cylinder. Several second assembly slots are set in correspondence with several first assembly slots.

[0025] Several assembly protrusions are fixedly set on the bottom end face of the second flange. The assembly protrusions respectively penetrate the sealing gasket of the flange joint assembly and insert into several first assembly grooves and their corresponding second assembly grooves, which are used to drive the drill bit body and the inner cylinder to rotate.

[0026] Furthermore, this device also includes:

[0027] Several helical blades are fixedly mounted on the circumferential sidewall of the drill bit body. The helical blades are arranged in a circular array around the central axis of the drill bit body, and the helical blades are spirally arranged along the axial direction of the drill bit body.

[0028] Several first alloy bodies are fixedly installed at the bottom of the drill bit body. The several first alloy bodies are arranged in a circular array around the central axis of the drill bit body, and the bottom end of the first alloy body is inclined towards one side of the drill bit body.

[0029] Several second alloy bodies are fixedly installed at the bottom end of the spiral blade. The bottom end of any one of the second alloy bodies is inclined toward one side of the drill bit body, and the inclination direction of the second alloy body extends toward the spiral direction of the bottom end of the spiral blade.

[0030] Furthermore, the device also includes: several receiving slots; several receiving slots are formed on the circumferential sidewall of the inner cylinder, the receiving slots are exposed on the end face surface of the bottom of the inner cylinder, and the positions of several receiving slots correspond one-to-one with those of several limiting blocks.

[0031] Furthermore, this device also includes:

[0032] Several guide grooves are formed on the circumferential sidewall of the inner cylinder. The guide grooves are arranged along the axial direction of the inner cylinder and are exposed on the end face surface of the bottom end of the inner cylinder.

[0033] Several guide protrusions are fixedly installed on the circumferential inner wall of the drill bit body. The guide protrusions are respectively inserted into several guide grooves, and the inner cavity shape of the guide protrusions matches that of the guide grooves.

[0034] A high-pressure grouting drill bit according to an embodiment of the present utility model has the following beneficial effects:

[0035] 1. This device fixes the tail end of the slurry nozzle in the interlayer between the inner cylinder and the drill bit body by matching the limiting block with the outer assembly hole, thereby achieving fixed assembly of the slurry nozzle. This avoids the problem of loosening of the slurry nozzle under continuous radial impact load in the prior art and enhances the vibration and loosening resistance of this device.

[0036] 2. This device uses a slurry nozzle composed of a first nozzle body and a second nozzle body. By utilizing the threaded assembly relationship between the first nozzle body and the second nozzle body, the second nozzle body is tightened so that its tail end presses against the inner wall of the inner assembly hole. The reaction force of the inner cylinder acting on the second nozzle body is used to press the limiting block, thereby enhancing the fixed assembly effect of the slurry nozzle.

[0037] It should be understood that both the foregoing general description and the following detailed description are exemplary and intended to provide further illustration of the claimed technology. Attached Figure Description

[0038] Figure 1 This is an assembly diagram according to an embodiment of the present utility model;

[0039] Figure 2 This is a schematic diagram of the assembly of the slurry nozzle according to an embodiment of the present invention (the drill bit body is transparent).

[0040] Figure 3 This is an exploded view of the structure according to an embodiment of the present utility model;

[0041] Figure 4 This is a schematic diagram of the internal structure of a slurry nozzle according to an embodiment of the present invention.

[0042] Explanation of reference numerals in the attached figures:

[0043] 1-Drill bit body, 11-Outer mounting hole, 12-Helical blade, 13-First alloy body, 14-Second alloy body, 15-Accommodation groove, 16-Guide groove, 17-Guide protrusion, 2-Inner cylinder, 21-Inner mounting hole, 3-Drill rod, 31-Reamer, 4-Slurry nozzle, 41-Limiting block, 42-First nozzle body, 43-Sealing ring, 44-Second nozzle body, 441-Drive groove, 5-Assembly module, 511-First flange, 5111-First through hole, 512-Second flange, 5121-Second through hole, 52-First mounting groove, 53-Second mounting groove, 54-Assembly protrusion. Detailed Implementation

[0044] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, further illustrating the present invention.

[0045] The foregoing and other technical contents, features, and effects of this utility model will be clearly presented in the following detailed description of the embodiments with reference to the accompanying drawings. The directional terms mentioned in the following embodiments, such as up, down, left, right, front, or back, are only for reference to the directions in the accompanying drawings. Therefore, the directional terms used are for illustrative purposes and not for limiting the present utility model. Furthermore, in all embodiments, the same reference numerals denote the same elements.

[0046] Specifically, such as Figures 1-3 As shown, a high-pressure grouting drill bit according to an embodiment of the present invention includes: a drill bit body 1, an inner cylinder 2, a plurality of outer assembly holes 11, a plurality of inner assembly holes 21, a plurality of grout nozzles 4, a plurality of limiting blocks 41, and an assembly module 5; the drill bit body 1 is disposed at the bottom end of the external drill rod 3, and a plurality of reamers 31 are fixedly disposed on the circumferential sidewall of the drill rod 3; the inner cylinder 2 is movably disposed in the inner cavity of the drill bit body 1, the inner cylinder 2 is matched with the inner cavity of the drill bit body 1, the top end of the inner cylinder 2 adopts an open design and its bottom end adopts a closed design, and the top port of the inner cylinder 2 communicates with the inner cavity of the drill rod 3; a plurality of outer assembly holes 11 are opened on the circumferential sidewall of the drill bit body 1; a plurality of inner assembly holes 21 are opened on the circumferential sidewall of the inner cylinder 2, and the plurality of inner assembly holes 21 and the plurality of outer assembly holes 11 are arranged one-to-one;

[0047] Several slurry nozzles 4 are movably inserted into several outer assembly holes 11, and the tail ends of several slurry nozzles 4 are respectively matched with the positions of several inner assembly holes 21; several limiting blocks 41 are respectively fixedly installed at the tail ends of several slurry nozzles 4, and the limiting blocks 41 are located between the inner cylinder 2 and the drill bit body 1 to limit the slurry nozzles 4; the assembly module 5 is installed at the bottom end of the drill rod 3, and the assembly module 5 is connected to the drill bit body 1 and the inner cylinder 2 to fix the drill bit body 1 and the inner cylinder 2 to the bottom end of the drill rod 3.

[0048] Furthermore, such as Figures 1-4 As shown, the slurry nozzle 4 includes: a first nozzle body 42 and a sealing ring 43; the first nozzle body 42 is movably inserted into the outer assembly hole 11, the first nozzle body 42 is a tubular component, the tail end of the first nozzle body 42 is matched with the position of the inner assembly hole 21, and the limiting block 41 is fixedly sleeved on the tail end of the first nozzle body 42; the sealing ring 43 is sleeved on the first nozzle body 42, the sealing ring 43 is fixedly connected to the limiting block 41, and the sealing ring 43 is located between the limiting block 41 and the inner wall of the drill bit body 1, and is used to seal the gap between the limiting block 41 and the inner wall of the drill bit body 1.

[0049] Furthermore, such as Figures 1-4As shown, the slurry nozzle 4 also includes: a second nozzle body 44 and a drive groove 441; the second nozzle body 44 is movably inserted into the inner cavity of the first nozzle body 42, and the tail end of the second nozzle body 44 is inserted into the inner mounting hole 21. The second nozzle body 44 is an externally threaded tube, and the first nozzle body 42 is an internally threaded tube. The second nozzle body 44 and the first nozzle body 42 are threadedly connected; a drive groove 441 is provided on the end face of the head end of the second nozzle body 44, and the drive groove 441 communicates with the inner cavity of the second nozzle body 44 to drive the second nozzle body 44 to rotate.

[0050] Furthermore, such as Figures 1-4 As shown, the inner cavity of the inner mounting hole 21 is frustum-shaped. The inner diameter of the port of the inner mounting hole 21 facing the inner wall of the drill bit body 1 is smaller than the inner diameter of the port of the inner mounting hole 21 facing away from the inner wall of the drill bit body 1. The tail end shape of the second nozzle body 44 matches the inner cavity shape of the inner mounting hole 21.

[0051] Furthermore, such as Figure 1 , 3 As shown, the assembly module 5 includes: a flange joint assembly, a first assembly groove 52, a second assembly groove 53, and a plurality of assembly protrusions 54; the flange joint assembly is disposed at the connection between the drill bit body 1 and the drill rod 3, and is used to fix the drill bit body 1 to the bottom end of the drill rod 3. In this embodiment, the flange joint assembly preferably uses a flat-welded flange joint; the first flange 511 of the flange joint assembly is fixedly disposed at the top end of the drill bit body 1, the first flange 511 is arranged radially along the drill bit body 1, the central axis of the first flange 511 is collinear with the central axis of the drill bit body 1, and the top end of the inner cylinder 2 is movably inserted into the inner cavity of the first flange 511; the second flange 512 of the flange joint assembly is fixedly disposed at the bottom end of the drill rod 3, and the second flange 512... The central axis is collinear with the central axis of the drill pipe 3; several first assembly slots 52 are formed on the top end face of the first flange 511, and the several first assembly slots 52 are arranged in a circumferential array around the central axis of the first flange 511; several second assembly slots 53 are formed on the top end face of the inner cylinder 2, and the several second assembly slots 53 are located on the circumferential outer edge of the top end face of the inner cylinder 2, and the several second assembly slots 53 are arranged one-to-one with the several first assembly slots 52; several assembly protrusions 54 are fixedly set on the bottom end face of the second flange 512, and the several assembly protrusions 54 respectively penetrate the sealing gasket of the flange joint assembly and are inserted into the several first assembly slots 52 and their corresponding second assembly slots 53, for driving the drill bit body 1 and the inner cylinder 2 to rotate.

[0052] Preferred, such as Figure 1 , 3As shown, the flange assembly includes: a first flange 511, a second flange 512, a gasket (not shown in the figure), a plurality of first through holes 5111, a plurality of second through holes 5121, a plurality of bolts (not shown in the figure), and a plurality of nuts (not shown in the figure); the first flange 511 and the second flange 512 are arranged opposite to each other; the gasket is disposed between the first flange 511 and the second flange 512 to seal the gap between the first flange 511 and the second flange 512; the plurality of first through holes 5111 are formed on the first flange 511, and the plurality of first through holes 5111 are located on the circumferential outer side of the drill bit body 1; the plurality of second through holes 5121... Hole 5121 is formed on the second flange 512. Several second through holes 5121 are located on the outer circumferential side of the drill rod 3. Several second through holes 5121 are set one-to-one with several first through holes 5111. Several bolts are respectively movably inserted into several second through holes 5121 and their corresponding first through holes 5111. The bottom of the bolt nut abuts against the end face of the bottom end of the second flange 512. Several nuts are respectively sleeved on the bottom end of several bolts. The nuts are threadedly connected to the bolts. The top end face of the nuts abuts against the end face of the bottom end of the first flange 511. They are used to cooperate with the bolts to lock and fix the first flange 511 and the second flange 512 together.

[0053] Furthermore, such as Figure 1 As shown, the device further includes: a plurality of helical blades 12, a plurality of first alloy bodies 13, and second alloy bodies 14; the plurality of helical blades 12 are fixedly disposed on the circumferential sidewall of the drill bit body 1, and the plurality of helical blades 12 are arranged in a circumferential array around the central axis of the drill bit body 1, and the helical blades 12 are helically arranged along the axial direction of the drill bit body 1; the plurality of first alloy bodies 13 are fixedly disposed at the bottom of the drill bit body 1, and the plurality of first alloy bodies 13 are arranged in a circumferential array around the central axis of the drill bit body 1, and the bottom end of the first alloy body 13 is inclined toward one side of the drill bit body 1; a plurality of second alloy bodies 14 are fixedly disposed at the bottom end of the helical blades 12, and the bottom end of any one of the second alloy bodies 14 is inclined toward one side of the drill bit body 1, and the inclination direction of the second alloy body 14 extends toward the helical direction of the bottom end of the helical blade 12.

[0054] Furthermore, such as Figures 1-3 As shown, the device also includes: a plurality of receiving grooves 15; the plurality of receiving grooves 15 are formed on the circumferential sidewall of the inner cylinder 2, the receiving grooves 15 are exposed on the end face surface of the bottom end of the inner cylinder 2, and the positions of the plurality of receiving grooves 15 correspond one-to-one with the positions of the plurality of limiting blocks 41. In this embodiment, after the inner cylinder 2 is inserted into the inner cavity of the drill bit body 1, the sidewall of the limiting block 41 facing the inner cylinder 2 is tightly attached to the inner wall of the receiving groove 15 under the elastic support of the sealing ring 43.

[0055] Furthermore, such as Figures 1-3 As shown, the device also includes: a plurality of guide grooves 16 and a plurality of guide protrusions 17; the plurality of guide grooves 16 are formed on the circumferential sidewall of the inner cylinder 2, the guide grooves 16 are arranged along the axial direction of the inner cylinder 2, and the guide grooves 16 are exposed on the end face surface of the bottom end of the inner cylinder 2; the plurality of guide protrusions 17 are fixedly arranged on the circumferential inner wall of the drill bit body 1, and the plurality of guide protrusions 17 are respectively inserted into the plurality of guide grooves 16, and the inner cavity shape of the guide protrusions 17 matches that of the guide grooves 16.

[0056] When the equipment is running, the drill rod 3 drives the drill bit body 1 and the inner cylinder 2 to rotate synchronously. During this process, the high-pressure slurry flows from the inner cavity of the drill rod 3 into the inner cavity of the inner cylinder 2, and then is sprayed out through the slurry nozzle 4 into the soil layer located outside the drill bit body 1, so that it mixes with the soil.

[0057] The assembly process is as follows: First, insert the slurry nozzle 4 into the outer mounting hole 11 of the drill bit body 1 from the inside out, ensuring that the head end of the first nozzle body 42 passes through the outer mounting hole 11 and protrudes from the outer surface of the drill bit body 1, and that the tail end of the second nozzle body 44 does not exceed the tail end port of the first nozzle body 42; then, align the guide groove 16 of the inner cylinder 2 with the guide protrusion 17 on the inner wall of the drill bit body 1 and insert it into the inner cavity of the drill bit body 1, ensuring that the outer mounting hole 11 is aligned with the inner mounting hole 21 on the inner cylinder 2; next, use an Allen wrench to drive the second nozzle body 44 to rotate, so that its tail end screws into and presses against the inner wall of the inner mounting hole 21, and uses the reaction force provided by the inner cylinder 2 to press the limiting block 41 against the inner wall of the drill bit body 1. On the wall, the slurry nozzle 4 is fixed, and after the tail end of the second nozzle body 44 is pressed against the inner wall of the inner mounting hole 21, the head end of the second nozzle body 44 does not exceed the head end port of the first nozzle body 42. After all the slurry nozzles 4 are installed, the assembled drill bit body 1 is connected to the bottom end of the drill rod 3: that is, the mounting protrusion 54 on the second flange 512 is aligned and inserted into the first mounting groove 52 and its corresponding second mounting groove 53 on the first flange 511, completing the initial connection between the first flange 511 and the second flange 512. Then, the bolts are inserted into the aligned first through hole 5111 and second through hole 5121, and the nuts are tightened at the bottom of the bolts, finally realizing the fixed assembly of the drill bit body 1 at the bottom end of the drill rod 3.

[0058] Above, refer to Figures 1-4 A high-pressure grouting drill bit according to an embodiment of the present invention is described, which has the following beneficial effects:

[0059] 1. This device fixes the tail end of the slurry nozzle 4 in the interlayer between the inner cylinder 2 and the drill bit body 1 by matching the limiting block 41 with the outer assembly hole 11. This achieves the fixed assembly of the slurry nozzle 4, avoids the problem of the slurry nozzle 4 easily loosening under continuous radial impact load in the prior art, and enhances the vibration and loosening resistance of this device.

[0060] 2. This device uses a slurry nozzle 4 composed of a first nozzle body 42 and a second nozzle body 44. By utilizing the threaded assembly relationship between the first nozzle body 42 and the second nozzle body 44, the second nozzle body 44 is tightened so that its tail end presses against the inner wall of the inner assembly hole 21. The reaction force of the inner cylinder 2 acting on the second nozzle body 44 is used to press the limiting block 41, thereby enhancing the fixed assembly effect of the slurry nozzle 4.

[0061] It should be noted that, in this specification, the terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0062] Although the present invention has been described in detail through the above preferred embodiments, it should be understood that the above description should not be considered as a limitation of the present invention. Various modifications and substitutions to the present invention will be apparent to those skilled in the art after reading the above content. Therefore, the scope of protection of the present invention should be defined by the appended claims.

Claims

1. A high-pressure grouting drill bit, characterized in that, Include: The drill bit body is located at the bottom of the external drill rod; An inner cylinder is movably disposed within the inner cavity of the drill bit body. The inner cylinder matches the shape of the inner cavity of the drill bit body, and the top port of the inner cylinder communicates with the inner cavity of the drill rod. Several outer mounting holes are formed on the circumferential sidewall of the drill bit body; Several inner mounting holes are formed on the circumferential sidewall of the inner cylinder, and the several inner mounting holes are provided in a one-to-one correspondence with the several outer mounting holes; Several slurry nozzles are movably inserted into several outer mounting holes, and the tail ends of several slurry nozzles are respectively matched with the positions of several inner mounting holes; Several limiting blocks are fixedly installed at the tail ends of the several slurry nozzles. The limiting blocks are located between the inner cylinder and the drill bit body and are used to limit the slurry nozzles. An assembly module is disposed at the bottom end of the drill rod. The assembly module is connected to the drill bit body and the inner cylinder and is used to fix the drill bit body and the inner cylinder to the bottom end of the drill rod.

2. The high-pressure grouting drill bit as described in claim 1, characterized in that, The slurry nozzle includes: The first nozzle body is movably inserted into the outer mounting hole. The first nozzle body is a tubular component. The tail end of the first nozzle body matches the position of the inner mounting hole. The limiting block is fixedly sleeved on the tail end of the first nozzle body. A sealing ring is fitted onto the first nozzle body and is fixedly connected to the limiting block. The sealing ring is located between the limiting block and the inner wall of the drill bit body and is used to seal the gap between the limiting block and the inner wall of the drill bit body.

3. The high-pressure grouting drill bit as described in claim 2, characterized in that, The slurry nozzle also includes: The second nozzle body is movably inserted into the inner cavity of the first nozzle body. The tail end of the second nozzle body is inserted into the inner mounting hole. The second nozzle body is an externally threaded tube, and the first nozzle body is an internally threaded tube. The second nozzle body is threadedly connected to the first nozzle body. A drive groove is provided on the end face of the second nozzle body, and the drive groove is connected to the inner cavity of the second nozzle body to drive the second nozzle body to rotate.

4. The high-pressure grouting drill bit as described in claim 3, characterized in that, The inner cavity of the inner mounting hole is frustum-shaped. The inner diameter of the port of the inner mounting hole facing the inner wall of the drill bit body is smaller than the inner diameter of the port of the inner mounting hole facing away from the inner wall of the drill bit body. The tail end shape of the second nozzle body matches the inner cavity shape of the inner mounting hole.

5. The high-pressure grouting drill bit as described in claim 1, characterized in that, The assembly module includes: A flange joint assembly is provided at the connection between the drill bit body and the drill rod, for fixing the drill bit body to the bottom end of the drill rod; The first flange of the flange joint assembly is fixedly disposed at the top of the drill bit body. The first flange is arranged radially along the drill bit body. The central axis of the first flange is collinear with the central axis of the drill bit body. The top of the inner cylinder is movably inserted into the inner cavity of the first flange. The second flange of the flange joint assembly is fixedly disposed at the bottom end of the drill pipe, and the central axis of the second flange is collinear with the central axis of the drill pipe; A plurality of first assembly slots are formed on the top end face of the first flange, and the plurality of first assembly slots are arranged in a circumferential array around the central axis of the first flange; A plurality of second assembly slots are formed on the top end face of the inner cylinder. The plurality of second assembly slots are located on the circumferential outer edge of the top end face of the inner cylinder. The plurality of second assembly slots are provided in a one-to-one correspondence with the plurality of first assembly slots. Several assembly protrusions are fixedly disposed on the bottom end face of the second flange. The assembly protrusions respectively penetrate the sealing gasket of the flange joint assembly and are inserted into the several first assembly slots and their corresponding second assembly slots, for driving the drill bit body and the inner cylinder to rotate.

6. The high-pressure grouting drill bit as described in claim 1, characterized in that, Also includes: Several helical blades are fixedly disposed on the circumferential sidewall of the drill bit body. The helical blades are arranged in a circular array around the central axis of the drill bit body and are spirally arranged along the axial direction of the drill bit body. A plurality of first alloy bodies are fixedly disposed at the bottom of the drill bit body. The plurality of first alloy bodies are arranged in a circumferential array around the central axis of the drill bit body, and the bottom end of the first alloy body is inclined toward one side of the drill bit body. A plurality of second alloy bodies are fixedly provided at the bottom end of the spiral blade. The bottom end of any one of the second alloy bodies is inclined toward one side of the drill bit body, and the inclination direction of the second alloy body extends toward the spiral direction of the bottom end of the spiral blade.

7. The high-pressure grouting drill bit as described in claim 1, characterized in that, It also includes: a plurality of receiving slots; the plurality of receiving slots are formed on the circumferential sidewall of the inner cylinder, the receiving slots are exposed on the end face surface of the bottom end of the inner cylinder, and the positions of the plurality of receiving slots correspond one-to-one with the positions of the plurality of limiting blocks.

8. The high-pressure grouting drill bit as described in claim 1, characterized in that, Also includes: Several guide grooves are formed on the circumferential sidewall of the inner cylinder, the guide grooves are arranged along the axial direction of the inner cylinder, and the guide grooves are exposed on the end face surface of the bottom end of the inner cylinder; Several guide protrusions are fixedly disposed on the circumferential inner wall of the drill bit body. The several guide protrusions are respectively inserted into the several guide grooves, and the inner cavity shape of the guide protrusions matches that of the guide grooves.

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