A cleaning drill bit for drilling

Abstract

This utility model provides a cleaning drill bit for drilling, comprising: a shaft, a drill bit body, a cleaning disc, and a cleaning mechanism; the shaft is fixedly connected to the center of the cleaning disc, and the drill bit body is fixedly connected to one end of the cleaning disc opposite to the shaft; the cleaning disc has a mounting component on its side wall for mounting the cleaning mechanism; the cleaning mechanism includes a mounting plate, a cleaning brush, a limiting frame, and a tightening assembly; the mounting component has a receiving cavity, and both the tightening assembly and the mounting plate are disposed within the receiving cavity; the cleaning brush is fixedly connected to one end face of the mounting plate opposite to the tightening assembly; the limiting frame is disposed at the opening of the receiving cavity to stop and limit the mounting plate; the limiting frame has a through groove for the cleaning brush to pass through. Thus, the cleaning mechanism can remove mud film or residue deposits formed on the borehole wall of steel pipe piles.

Description

Technical Field

[0001] This utility model belongs to the field of drilling equipment technology, and in particular relates to a clean drill bit for drilling. Background Technology

[0002] With the rapid advancement of my country's marine bridge and large-scale infrastructure construction projects, steel pipe pile foundations, as key load-bearing structures, are widely used in bridge, wharf, artificial island, and other engineering projects. The construction of these foundations typically involves rotary drilling to create deep pile holes inside the steel pipe pile and in the underlying strata, providing the necessary conditions for subsequent reinforcement cage placement and concrete pouring.

[0003] In actual construction, drilling of steel pipe piles is often carried out in stages: first, a large-diameter scraper drill bit is used to drill into the steel pipe pile, penetrating the overburden layer until the drill bit emerges from the bottom of the pile. Then, a smaller-diameter scraper drill bit is used to continue drilling into deeper strata, and finally, a roller drill bit matching the design diameter of the pile bottom is used for final hole enlargement. However, during the drilling process, the hole will be filled with high-density mud, which carries a large amount of fine particles and sediment, easily forming mud film or residue deposits on the hole wall.

[0004] To address mud film or residue deposition, the existing process involves drilling to the designed depth, whereby construction personnel use a measuring rope to confirm the hole depth. Once confirmed, hole cleaning operations are carried out, typically by activating a circulation system in conjunction with a sand separator to remove mud film or residue deposits, thereby improving the cleanliness of the hole bottom and walls and creating conditions for concrete pouring.

[0005] However, throughout the drilling process, the drill bit itself only has the function of crushing and cutting, lacking the ability to physically scrape and clean the borehole wall. Therefore, during drilling, a large amount of mud, fine cuttings, and mud cake easily adhere to the borehole wall, especially in complex strata such as cohesive soil, silty clay, or crust-bearing sand layers. These deposits are highly adhesive and do not easily detach naturally. Although these deposits can be removed later through borehole cleaning, it takes a considerable amount of time to completely remove them, resulting in a decrease in overall construction efficiency. Utility Model Content

[0006] In view of this, the purpose of this utility model is to propose a cleaning drill bit for drilling, which solves the problem that large-diameter scraper drill bits cannot simultaneously remove mud film or residue deposits on the inner wall of steel pipe piles during drilling.

[0007] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0008] A cleaning drill bit for drilling includes: a shaft, a drill bit body, a cleaning disc, and a cleaning mechanism;

[0009] The shaft is fixedly connected to the center of the cleaning disc, and the drill bit body is fixedly connected to one end of the cleaning disc away from the shaft. The cleaning disc sidewall is provided with mounting parts for mounting the cleaning mechanism.

[0010] The cleaning mechanism includes a mounting plate, a cleaning brush, a limiting frame, and a clamping assembly. The mounting plate has a storage cavity, and both the clamping assembly and the mounting plate are disposed within the storage cavity. The cleaning brush is fixedly connected to one end face of the mounting plate opposite to the clamping assembly. The limiting frame is disposed at the opening of the storage cavity to stop and limit the mounting plate. The limiting frame has a through groove for the cleaning brush to pass through.

[0011] Furthermore, the clamping assembly includes a base plate, a connecting plate, a guide post, and a clamping spring;

[0012] The substrate has a through hole for the guide post to pass through. One end of the guide post is fixed to the connecting plate, and the other end passes through the through hole, passes through the substrate, and extends into the storage hole located on the bottom surface of the storage cavity. The clamping spring is located between the substrate and the connecting plate and is sleeved on the guide post.

[0013] Furthermore, the mounting plate has a fixing stud on the end face opposite to the cleaning brush, the connecting plate has a through hole for the fixing stud to pass through, and a fixing nut is threaded onto the fixing stud.

[0014] Furthermore, the limiting frame is provided with a first connecting ear plate, and the outer wall surface of the mounting component is provided with a second connecting ear plate corresponding to the first connecting ear plate.

[0015] Furthermore, the cross-sectional area of ​​the through groove of the limiting frame is smaller than the cross-sectional area of ​​the mounting plate.

[0016] Furthermore, there are multiple mounting components, each of which corresponds to one cleaning mechanism, and the multiple mounting components are arranged at intervals along the circumference of the cleaning disc.

[0017] Furthermore, there are multiple cleaning discs, which are spaced apart along the length of the shaft, with an installation gap between adjacent cleaning discs, and a scraping mechanism is installed within the installation gap.

[0018] Furthermore, the scraping mechanism includes a support column, a connecting flange, a rotating drum, a connecting arm, and a scraper assembly;

[0019] The support column is fixed to the connecting flange at both ends along its height direction, so that the support column can be detachably connected between two adjacent cleaning discs. A rotating cylinder is rotatably connected to the support column, and a connecting arm is fixed to the outer wall of the rotating cylinder. A scraper assembly is installed at the end of the connecting arm opposite to the rotating cylinder.

[0020] Furthermore, the scraper assembly includes a fixing plate and a scraper blade. The connecting arm is provided with a mating plate corresponding to the fixing plate. The scraper blade is fixedly connected to one end face of the fixing plate away from the connecting arm, and there are multiple scraper blades.

[0021] Furthermore, the cleaning disc is also provided with a stop mechanism for stopping the connecting arm;

[0022] The stopping mechanism includes a stop seat and a buffer assembly mounted on the stop seat. The buffer assembly includes a sleeve, a buffer rod, a limiting ring platform, and a buffer spring. The sleeve is fixedly connected to the stop seat and has a buffer cavity and a connecting port. The connecting port communicates with the buffer cavity so that the buffer rod passes through the sleeve through the connecting port. The limiting ring platform is fixedly connected to the buffer rod. The buffer spring is sleeved on the buffer rod, with one end of the buffer spring abutting against the bottom surface of the buffer cavity and the other end abutting against the limiting ring platform.

[0023] Through the above technical solution, by setting a mounting component for installing the cleaning mechanism on the side wall of the cleaning plate, the cleaning mechanism can scrape the hole wall of the steel pipe pile without affecting the normal drilling of the drill bit body, thereby removing the mud film or residue deposits formed on the hole wall. Specifically, the mounting plate extends the cleaning brush part connected to it out of the receiving cavity through the through groove of the limiting frame, and contacts the hole wall to scrape during the rotation of the drill bit, so as to simultaneously clean the deposits on the hole wall. At the same time, the clamping component set inside the cleaning mechanism can firmly press the mounting plate to the back of the limiting frame, effectively preventing the mounting plate from shaking during drilling and ensuring that the cleaning brush can work stably. Attached Figure Description

[0024] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0025] Figure 1 This is a schematic diagram of the structure of the cleaning drill bit provided in an exemplary embodiment of this disclosure;

[0026] Figure 2 This is a schematic diagram of the cleaning mechanism provided in an exemplary embodiment of this disclosure;

[0027] Figure 3 This is a schematic diagram of the structure of the mounting plate, cleaning brush, and limiting frame provided in an exemplary embodiment of this disclosure;

[0028] Figure 4 This is a schematic diagram of the scraping mechanism provided in an exemplary embodiment of this disclosure;

[0029] Figure 5 This is a schematic diagram of the structure of the stop mechanism provided in an exemplary embodiment of this disclosure at one angle;

[0030] Figure 6 This is a schematic diagram of the stop mechanism provided in an exemplary embodiment of this disclosure from another angle;

[0031] Figure 7 This is a cross-sectional structural schematic diagram of the stop mechanism provided in an exemplary embodiment of this disclosure;

[0032] Figure 8 This is a schematic diagram of the structure of the storage cavity provided in an exemplary embodiment of this disclosure.

[0033] Explanation of reference numerals in the attached figures:

[0034] 1. Shaft; 2. Drill bit body; 3. Cleaning disc; 4. Cleaning mechanism; 401. Mounting plate; 402. Cleaning brush; 403. Limiting frame; 4031. First connecting ear plate; 404. Tightening assembly; 4041. Base plate; 4042. Connecting plate; 4043. Guide post; 4044. Tightening spring; 5. Mounting component; 501. Storage cavity; 5011. Storage hole; 502. Second connecting ear plate; 6. Fixing stud; 01. Fixing nut; 7. Scraping mechanism; 701. Support column; 702. Connecting flange; 703. Rotary drum; 704. Connecting arm; 705. Scraper assembly; 7051. Fixing plate; 7052. Scraper blade; 706. Butt plate; 8. Stop mechanism; 801. Stop seat; 802. Sleeve; 8021. Connecting port; 8022. Buffer chamber; 803. Buffer rod; 804. Limiting ring platform; 805. Buffer spring. Detailed Implementation

[0035] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0036] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0037] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0038] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0039] In the specific embodiments provided in this disclosure, a cleaning drill bit for drilling is provided, with reference to... Figures 1 to 8 As shown, the cleaning drill bit includes: a shaft 1, a drill bit body 2, a cleaning disc 3, and a cleaning mechanism 4; the shaft 1 is fixedly connected to the center of the cleaning disc 3, and the end of the cleaning disc 3 opposite to the shaft 1 is fixedly connected to the drill bit body 2. The side wall of the cleaning disc 3 is provided with a mounting part 5 for mounting the cleaning mechanism 4; the cleaning mechanism 4 includes a mounting plate 401, a cleaning brush 402, a limiting frame 403, and a tightening assembly 404. The mounting part 5 has a receiving cavity 501. The tightening assembly 404 and the mounting plate 401 are both disposed in the receiving cavity 501. The end face of the mounting plate 401 opposite to the tightening assembly 404 is fixedly connected to the cleaning brush 402. The limiting frame 403 is disposed at the opening of the receiving cavity 501 to stop and limit the mounting plate 401. The limiting frame 403 is provided with a through groove for the cleaning brush 402 to pass through.

[0040] Through the above technical solution, by setting the mounting part 5 for mounting the cleaning mechanism 4 on the side wall of the cleaning disc 3, the cleaning mechanism 4 can scrape the hole wall of the steel pipe pile without affecting the normal drilling of the drill bit body 2, thereby removing the mud film or residue deposits formed on the hole wall. Specifically, the mounting plate 401 extends the cleaning brush 402 connected to it out of the receiving cavity 501 through the through groove of the limiting frame 403, and contacts the hole wall to scrape during the rotation of the drill bit, so as to achieve the purpose of simultaneously cleaning the deposits on the hole wall. At the same time, the tightening component 404 set inside the cleaning mechanism 4 can firmly press the mounting plate 401 to the back of the limiting frame 403, effectively preventing the mounting plate 401 from shaking during the drilling process and ensuring that the cleaning brush 402 can work stably.

[0041] For example, the cleaning brush 402 can maintain stable contact with the hole wall at all times during the drilling process. The cleaning brush 402 can simultaneously scrape the hole wall while the drill bit body 2 is drilling, effectively reducing the accumulation of sediment on the hole wall, shortening the subsequent hole cleaning operation time, and significantly improving the hole formation efficiency and construction quality.

[0042] In some implementations, reference Figure 2 As shown, the clamping assembly 404 includes a base plate 4041, a connecting plate 4042, guide posts 4043, and a clamping spring 4044. The base plate 4041 is disposed in the receiving cavity 501 and abuts against the inner wall of the receiving cavity 501 under the elastic force of the clamping spring 4044. The base plate 4041 is provided with through holes for the guide posts 4043 to pass through. One end of each guide post 4043 is fixedly connected to the connecting plate 4042, and the other end passes through the through hole and extends further into the receiving hole 5011 at the bottom of the receiving cavity 501. During the process of installing the clamping assembly 404 into the receiving cavity 501, the guide posts 4043 can play a positioning role. At this time, the clamping spring 4044 is sleeved on the guide post 4043 and located between the base plate 4041 and the connecting plate 4042. When the limiting frame 403 is installed in place, under the elastic force of the clamping spring 4044, the mounting plate 401 can be stably attached to the limiting frame 403. That is, the mounting plate 401 is located between the limiting frame 403 and the connecting plate 4042. The connecting plate 4042 can increase the contact area with the mounting plate 401. Under the elastic force of the clamping spring, the connecting plate 4042 can apply a force to the mounting plate 401 toward the opening of the storage cavity 501 to ensure that the mounting plate 401 can be stably placed in the storage cavity 501.

[0043] For example, when the clamping assembly 404 is installed in the receiving cavity 501 to install the limiting frame 403, as the limiting frame 403 is installed, the back of the limiting frame 403 gradually abuts against the mounting plate 401. After the limiting frame 403 is fixed in place, the mounting plate 401 is reliably confined inside the receiving cavity 501. During this process, the mounting plate 401 moves under the limiting action of the limiting frame 403, causing the connecting plate 4042 and the guide post 4043 behind the mounting plate 401 to retract into the receiving cavity 501 as a whole, thereby gradually compressing the clamping spring 4044 sleeved on the guide post 4043. When the limiting frame 403 is completely fixed, the clamping spring 4044 is in a compressed state, forming an elastic preload. At this time, the end of the guide post 4043 facing away from the connecting plate 4042 extends into the receiving hole 5011 on the bottom surface of the receiving cavity 501. Since the top spring 4044 is in a compressed state, its elastic force is transmitted to the mounting plate 401 through the connecting plate 4042, causing the mounting plate 401 to continuously and reliably press against the back of the limit frame 403, thereby achieving stable fixation and flexible buffering of the cleaning mechanism 4, and effectively improving the shock resistance and impact resistance during drilling operations.

[0044] In some implementations, reference Figure 2 and Figure 3 As shown, in order to further improve the connection reliability between the mounting plate 401 and the connecting plate 4042, a fixing stud 6 is provided on the end face of the mounting plate 401 facing away from the cleaning brush 402. The connecting plate 4042 is provided with a through hole for the fixing stud 6 to pass through. After the fixing stud 6 passes through the through hole, a fixing nut 601 is threaded onto the fixing stud 6. The fixing nut 601 ensures that the mounting plate 401 and the connecting plate 4042 can be firmly attached.

[0045] In some implementations, reference Figures 1 to 3 As shown, in order to facilitate quick positioning and reliable connection between the limiting frame 403 and the mounting part 5, the limiting frame 403 is provided with a first connecting ear plate 4031, and the outer wall of the mounting part 5 is provided with a second connecting ear plate 502 corresponding to the first connecting ear plate 4031. The first connecting ear plate 4031 and the second connecting ear plate 502 can be fastened together by screws, bolts or riveting, so that the limiting frame 403 is stably installed at the opening of the mounting part 5.

[0046] In some implementations, reference Figures 1 to 3 As shown, in order to limit the mounting plate 401 and prevent it from coming out of the storage cavity 501, the limiting frame 403 is provided with a through groove. The through groove is used to allow the cleaning brush 402 to pass through to the outside of the storage cavity 501 for scraping operations. The cross-sectional area of ​​the through groove is smaller than the cross-sectional area of ​​the mounting plate 401, thus forming a constraint relationship in terms of size.

[0047] In some implementations, reference Figure 1 and Figure 8 As shown, there are multiple mounting parts 5, each of which corresponds to a cleaning mechanism 4. The multiple mounting parts 5 are arranged at intervals along the circumference of the cleaning disc 3 and are distributed in a ring shape, which significantly improves the contact density of the cleaning brush 402 to the hole wall and the number of repeated cleanings. It can also improve the scraping efficiency per unit time, enhance the removal intensity of mud film, sediment and other attachments, make the cleaning process more thorough, and effectively reduce the risk of residue accumulation on the hole wall.

[0048] In some implementations, reference Figure 1 , Figure 4 as well as Figure 8 As shown, there are multiple cleaning discs 3, which are spaced apart along the length of the shaft 1 to form a layered arrangement. An installation interval for functional expansion is formed between two adjacent cleaning discs 3. A scraping mechanism 7 is provided in this installation interval to further enhance the cleaning effect.

[0049] Furthermore, each cleaning disc 3 is equipped with multiple cleaning mechanisms 4. As the drill bit rotates, the multiple cleaning mechanisms 4 can perform circumferential scraping on the surface of the hole wall. The multiple cleaning discs 3 can perform cleaning operations in layers and sections in the drilling depth direction, effectively expanding the cleaning coverage area.

[0050] In some implementations, reference Figure 1 , Figure 4 as well as Figure 8 As shown, the scraping mechanism 7 includes a support column 701, a connecting flange 702, a rotating drum 703, a connecting arm 704, and a scraper assembly 705. The support column 701 has connecting flanges 702 fixedly connected to both ends of its height-directed arrangement, allowing the support column 701 to be detachably connected between two adjacent cleaning discs 3. The rotating drum 703 is rotatably connected to the support column 701. Bearings can be installed on the support column 701 to allow the rotating drum 703 to rotate more smoothly. The connecting arm 704 is fixedly connected to the outer wall of the rotating drum 703, and the connecting arm 704 is positioned away from the rotating drum 703. One end of the drill bit is equipped with a scraper assembly 705. When the drill bit rotates, under the action of centrifugal force, the rotating drum 703 begins to rotate around the support column 701, thereby driving the connecting arm 704 fixed to its outer wall to swing outward gradually. This causes the scraper assembly 705 installed at the end of the connecting arm 704 away from the rotating drum 703 to gradually approach the borehole wall. As the drilling process continues, the scraper assembly 705 maintains contact with the borehole wall under the action of centrifugal force and forms a sweeping trajectory along the circumference of the borehole wall under the action of the drill bit rotation. This effectively scrapes and peels off the deposits, mud film or other attached impurities on the surface of the borehole wall, significantly improving the cleanliness of the borehole wall.

[0051] In some implementations, reference Figure 1 , Figure 4 as well as Figure 8 As shown, the scraper assembly 705 includes a fixing plate 7051 and a scraper blade 7052. The connecting arm 704 is provided with a docking plate 706 corresponding to the fixing plate 7051, which is used to install the scraper assembly 705 at the far end of the connecting arm 704. The scraper blade 7052 is fixedly connected to one end face of the fixing plate 7051 away from the connecting arm 704, and there are multiple scraper blades 7052. Multiple scraper blades 7052 can contact the hole wall under the rotation of the drill bit and scrape the hole wall tightly under the action of centrifugal force, effectively improving the cleaning coverage density and peeling efficiency.

[0052] In some implementations, reference Figures 5 to 8 As shown, the cleaning disc 3 is also provided with a stop mechanism 8 for stopping the connecting arm 704; the stop mechanism 8 includes a stop seat 801 and a buffer assembly installed on the stop seat 801. The buffer assembly includes a sleeve 802, a buffer rod 803, a limiting ring platform 804, and a buffer spring 805. The sleeve 802 is fixed to the stop seat 801. The sleeve 802 has a buffer cavity 8022 and a connecting port 8021. The connecting port 8021 is connected to the buffer cavity 8022 so that the buffer rod 803 passes through the sleeve 802 through the connecting port 8021. The limiting ring platform 804 is fixed to the buffer rod 803. The buffer spring 805 is sleeved on the buffer rod 803 and one end of the buffer spring 805 abuts against the bottom surface of the buffer cavity 8022, and the other end abuts against the limiting ring platform 804.

[0053] In some implementations, such as Figures 5 to 8 As shown, the cleaning disc 3 is also equipped with a stop mechanism 8 for stopping the connecting arm 704, so as to limit the swing amplitude of the connecting arm 704 under the action of centrifugal force and prevent it from extending outward beyond the limit, which would damage the scraper assembly 705. The stop mechanism 8 includes a stop seat 801 and a buffer assembly installed on the stop seat 801. The buffer assembly includes a sleeve 802, a buffer rod 803, a limiting ring platform 804, and a buffer spring 805. The sleeve 802 is fixedly connected to the stop seat 801 and has a buffer cavity 8022 inside. Its outer wall has a communication port 8021 that communicates with the buffer cavity 8022. The buffer rod 803 passes through the communication port 8021 into the sleeve 802. The limiting ring platform 804 is fixed on the buffer rod 803 and located in the buffer cavity 8022. The buffer spring 805 is sleeved on the buffer rod 803, with one end abutting the bottom surface of the buffer cavity 8022 and the other end abutting the limiting ring platform 804.

[0054] When the connecting arm 704 swings to contact the stop mechanism 8, the buffer rod 803 can move axially within the buffer cavity 8022, while compressing the buffer spring 805, thereby absorbing the impact and mitigating the external force, preventing the scraper assembly 705 from forming a rigid collision with the hole wall, improving the system's shock resistance and stability, and extending the service life of the scraping mechanism 7.

[0055] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A cleaning drill bit for drilling a hole, characterized by, The utility model relates to a kind of cleaning device, including: Shaft (1), drill body (2), cleaning disc (3) and cleaning mechanism (4); The shaft (1) is fixedly connected to the center of the cleaning disc (3), and the drill body (2) is fixedly connected to the end of the cleaning disc (3) away from the shaft (1), and the cleaning disc (3) is provided with a mounting part (5) on the side wall for mounting the cleaning mechanism (4); The cleaning mechanism (4) includes a mounting plate (401), a cleaning brush (402), a limiting frame (403), and a tightening assembly (404). The mounting part (5) has a receiving cavity (501), and the tightening assembly (404) and the mounting plate (401) are arranged in the receiving cavity (501). The cleaning brush (402) is fixedly connected to the end face of the mounting plate (401) away from the tightening assembly (404). The limiting frame (403) is arranged at the opening of the receiving cavity (501) to stop the mounting plate (401). The limiting frame (403) is provided with a through slot for the cleaning brush (402) to pass through.

2. A cleaning bit for drilling a hole according to claim 1, characterized in that: The tightening assembly (404) includes a base plate (4041), a connecting plate (4042), a guide column (4043), and a tightening spring (4044). The base plate (4041) is provided with a through hole for the guide column (4043) to pass through. One end of the guide column (4043) is fixedly connected to the connecting plate (4042), and the other end passes through the through hole of the base plate (4041) and extends into the receiving hole (5011) on the bottom surface of the receiving cavity (501). The tightening spring (4044) is located between the base plate (4041) and the connecting plate (4042) and is sleeved on the guide column (4043).

3. A cleaning bit for drilling a hole according to claim 2, wherein: The end face of the mounting plate (401) away from the cleaning brush (402) is provided with a fixing stud (6), and the connecting plate (4042) is provided with a through hole for the fixing stud (6) to pass through. The fixing stud (6) is threadedly connected with a fixing nut (601).

4. A cleaning bit for drilling according to claim 1, wherein: The limiting frame (403) is provided with a first connecting ear plate (4031), and the outer wall surface of the mounting part (5) is provided with a second connecting ear plate (502) corresponding to the first connecting ear plate (4031).

5. A cleaning bit for drilling according to claim 1, wherein: The cross-sectional area of the through slot of the limiting frame (403) is smaller than the cross-sectional area of the mounting plate (401).

6. A cleaning bit for drilling according to claim 1, wherein: The number of mounting parts (5) is multiple, and each mounting part (5) corresponds to one cleaning mechanism (4). The multiple mounting parts (5) are arranged along the circumference of the cleaning disc (3).

7. A cleaning bit for drilling according to claim 1, wherein: The number of cleaning discs (3) is multiple, and the multiple cleaning discs (3) are arranged along the length direction of the shaft (1). An installation interval is formed between two adjacent cleaning discs (3), and a scraping mechanism (7) is installed in the installation interval.

8. A cleaning bit for drilling a hole according to claim 7, wherein: The scraping mechanism (7) includes a support column (701), a connecting flange (702), a rotating drum (703), a connecting arm (704), and a scraper assembly (705). The support column (701) is fixedly connected with the connecting flange plate (702) at two ends arranged opposite along the height direction of the support column (701), so that the support column (701) can be detachably connected between two adjacent cleaning discs (3), and a rotating drum (703) is rotatably connected to the support column (701), a connecting arm (704) is fixedly connected to the outer wall surface of the rotating drum (703), and a scraper assembly (705) is mounted at one end of the connecting arm (704) away from the rotating drum (703).

9. A cleaning bit for drilling a hole according to claim 8, wherein: The scraper assembly (705) comprises a fixed plate (7051) and a scraper (7052), the connecting arm (704) is provided with a butt joint plate (706) corresponding to the fixed plate (7051), the fixed plate (7051) is fixedly connected with a scraper (7052) at one end of the end face away from the connecting arm (704), and the number of the scrapers (7052) is multiple.

10. A cleaning bit for drilling a hole according to claim 9, wherein: The cleaning disc (3) is further provided with a stop mechanism (8) for stopping the connecting arm (704); The stop mechanism (8) comprises a stop seat (801) and a buffer assembly mounted on the stop seat (801), the buffer assembly comprises a sleeve (802), a buffer rod (803), a limiting ring table (804) and a buffer spring (805), the sleeve (802) is fixedly connected to the stop seat (801), the sleeve (802) has a buffer cavity (8022) and a communication port (8021), the communication port (8021) is communicated with the buffer cavity (8022), so that the buffer rod (803) passes through the sleeve (802) through the communication port (8021), the limiting ring table (804) is fixedly connected to the buffer rod (803), the buffer spring (805) is sleeved on the buffer rod (803), one end of the buffer spring (805) abuts against the bottom surface of the buffer cavity (8022), and the other end of the buffer spring (805) abuts against the limiting ring table (804).

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