A rotary excavating pile hole cleaning device

Abstract

The utility model provides a kind of rotary excavating pile hole cleaning device, belong to hole cleaning device technical field, the rotary excavating pile hole cleaning device includes hollow drill rod, helical blade, adjusting mechanism and suction residue component;The helical blade is spirally arranged along the axial direction of the hollow drill rod, the helical blade is rotatably connected with the hollow drill rod;The adjusting mechanism is located on the hollow drill rod and is connected with the helical blade, for adjusting the pitch and angle of the helical blade;The suction residue component includes suction residue pipeline and ground collecting device, the suction residue pipeline penetrates the inside of the hollow drill rod, and its lower end corresponds with the sediment delivery area formed by the helical blade, and the upper end is communicated with the ground collecting device, and the adjusting mechanism includes screw nut assembly, solves the problem that in the construction of wind tunnel foundation rotary excavating pile, the hole bottom sediment of traditional hole cleaning device is not completely removed, and the wall adhering material remains, so as to affect the pile foundation bearing capacity and construction quality.

Description

Technical Field

[0001] This utility model belongs to the technical field of hole cleaning devices, specifically, it relates to a hole cleaning device for rotary drilling piles. Background Technology

[0002] The borehole cleaning device for rotary drilling piles is a key piece of equipment in rotary drilling pile construction. It is mainly used to remove sediment and debris from the bottom and walls of the borehole after drilling, ensuring a tight bond between the pile foundation and the bearing stratum, and meeting the requirements for single pile bearing capacity and settlement control. Its core function is to use a mechanical structure to transport sediment such as slag and rock cuttings from the bottom of the borehole to the surface, preventing uneven stress and reduced bearing capacity caused by residual sediment. In projects with extremely high precision requirements, such as wind tunnel foundations, the quality of borehole cleaning directly affects the stability of the tunnel structure; therefore, the performance of the borehole cleaning device is crucial to the overall quality of the project.

[0003] Traditional rotary drilling rigs for cleaning boreholes often employ a fixed structural design, which has several significant drawbacks: First, the fixed pitch and angle of the helical blades make them unsuitable for different types of sediment. For example, when dealing with thick, hard, moderately weathered argillaceous sandstone debris, the fixed-pitch blades cannot deliver enough material per pass, leading to sediment accumulation. Conversely, when handling loose silty clay sediment, the excessively large pitch causes sediment to fall during transport, resulting in incomplete cleaning. Second, the borehole wall cleaning capacity is limited. The blade edges of traditional devices are often smooth, making it difficult to remove mud skin and rock debris adhering to the borehole wall. These adhering materials, once detached, form secondary sediment, increasing the number of cleaning passes and construction costs. Third, the adjustment mechanism is lacking. While some devices have attempted to use variable-pitch blades, they cannot adjust in real time according to the sediment on site, only adapting to preset working conditions. This results in poor adaptability in areas with complex geological conditions (such as the "intermingling distribution of miscellaneous fill, colluvial silty clay, and bedrock" strata mentioned in the document). Fourth, the coordination between sediment transport and collection is insufficient. The fixed relative position of the slag suction pipe and the blades can easily lead to a "blind spot" in the conveying process, which can prevent some slag from entering the slag suction pipe and leave residue at the bottom of the hole, affecting the quality of the pile. Utility Model Content

[0004] In view of this, the present invention provides a rotary drilling pile hole cleaning device, which solves the problem that traditional hole cleaning devices cannot completely remove sediment from the bottom of the hole and leave residue on the hole wall in the construction of rotary drilling piles for wind tunnel foundations, thereby affecting the bearing capacity and construction quality of the pile foundation.

[0005] This utility model is implemented as follows: This utility model provides a rotary drilling pile cleaning device, which includes a hollow drill rod, helical blades, an adjusting mechanism, and a slag suction assembly. The helical blades are helically arranged along the axial direction of the hollow drill rod and are rotatably connected to the hollow drill rod. The adjusting mechanism is located on the hollow drill rod and connected to the helical blades, and is used to adjust the pitch and angle of the helical blades. The slag suction assembly includes a slag suction pipe and a ground collection device. The slag suction pipe passes through the interior of the hollow drill rod, and its lower end corresponds to the slag conveying area formed by the helical blades, while its upper end is connected to the ground collection device.

[0006] The ground collection device includes a sediment separation box, a sediment storage tank, a negative pressure pump, and pipeline connectors. These components are connected sequentially via pipelines to form a closed-loop collection system, as detailed below: Sludge Separation Box: It is a rectangular box with an open top. The internal filter screen assembly is arranged vertically to divide the box into a settling zone and a clear liquid zone. The lower side of the sludge separation box has a sludge inlet that connects to the upper end of the sludge suction pipe. The sludge inlet is located in the settling zone and is inclined towards the filter screen (inclination angle 30°-45°) so that the sludge can achieve initial solid-liquid separation when it is flushed towards the filter screen by the liquid flow. The bottom of the clear liquid zone has a liquid outlet that is connected to the input end of the negative pressure pump through a return liquid pipe.

[0007] Sludge storage bucket: It is a cylindrical sealed bucket. Its top is connected to the bottom of the sedimentation zone of the sediment separation box through a sludge discharge pipe (a manual gate valve is installed on the sludge discharge pipe) to collect solid sludge intercepted by the filter screen. The upper side wall of the sludge storage bucket is equipped with an observation window (made of transparent acrylic plate) to observe the amount of sludge accumulation inside. The bottom is equipped with a removable sealed bottom cover for easy regular cleaning of sludge.

[0008] Negative pressure pump: It adopts a vane vacuum pump and is installed on a concrete base on the ground. Its input end is connected to the outlet of the sediment separation tank through the return pipe, and its output end can be selectively connected to the sedimentation tank or circulating water tank at the construction site through the drain pipe. A pressure regulating valve is installed on the pipeline between the negative pressure pump and the sediment separation tank to control the negative pressure value in the sludge suction pipeline.

[0009] Pipeline connections: The slag suction pipe is connected to the slag inlet of the slag separation box by a flexible corrugated pipe. Both ends of the corrugated pipe are sealed to the slag suction pipe and the slag inlet by flanges (oil-resistant rubber gaskets are sandwiched between the flanges); 90° elbows (made of wear-resistant cast iron) are used at all pipe bends, and the inner wall of the elbow is provided with a flow guide ridge to reduce liquid flow resistance.

[0010] Based on the above technical solution, the rotary drilling pile cleaning device of this utility model can be further improved as follows: The adjusting mechanism includes a lead screw and nut assembly, which is arranged along the axial direction of the hollow drill rod. The two ends of the lead screw are rotatably connected to the hollow drill rod, and the nut is fixedly connected to the end of the helical blade. When the lead screw is rotated, the nut moves along the axial direction of the lead screw, causing the end of the helical blade to move synchronously to change the pitch.

[0011] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the setting of the screw nut assembly makes the pitch adjustment of the spiral blade more precise and controllable. The blade end displacement is directly driven by the nut moving along the axial direction of the screw, and the adjustment process is stable and without jamming. Compared with the rough adjustment methods such as manual prying, the pitch can be continuously fine-tuned to adapt to the slight changes in the thickness of the sludge, further improve the efficiency of sludge conveying, and reduce the rework rate of hole cleaning.

[0012] Furthermore, the helical blade includes multiple blade units, and adjacent blade units are connected by hinges. The hinges are linked to the nuts of the lead screw and nut assembly. The movement of the nuts drives the adjacent blade units to rotate around the hinges to adjust the blade angle.

[0013] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the blade unit is connected by a hinge and linked with the nut, which makes the angle adjustment of the spiral blade more flexible. The contact posture between the blade and the bottom of the hole can be adjusted in real time according to the inclination of the hole wall or the angle of sediment accumulation (such as increasing the local blade angle when encountering an inclined hole bottom); the coordinated action of adjacent blade units avoids blade deformation or breakage, extends the service life of the equipment, and ensures the stability of hole cleaning in complex hole environments.

[0014] Furthermore, the edge of the spiral blade is provided with scraping teeth, which are evenly distributed along the circumference of the spiral blade, and the ends of the scraping teeth are adapted to the wall of the pile hole.

[0015] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the scraping teeth on the edge of the spiral blade can directly remove the mud, rock debris and other attachments on the borehole wall, avoiding the attachments from falling off and forming secondary sediment; the scraping teeth are evenly distributed in the circumference to ensure that there are no dead corners in the borehole wall cleaning, and in conjunction with the sediment conveying function of the spiral blade, the "borehole wall cleaning + sediment collection" is integrated, reducing the borehole cleaning process and improving construction efficiency.

[0016] Furthermore, the outer wall of the hollow drill rod is provided with a guide groove, which extends along the axial direction of the hollow drill rod. The inner side of the helical blade is provided with a guide block that cooperates with the guide groove. The guide block is embedded in the guide groove and can slide along the groove.

[0017] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the cooperation between the guide groove and the guide block provides directional constraints for the movement of the spiral blade, preventing radial offset or torsion during blade adjustment, and ensuring the accuracy of pitch and angle adjustment; at the same time, it reduces friction and wear between the blade and the hollow drill rod, reduces equipment failure rate, and ensures the continuity of hole cleaning operation.

[0018] Furthermore, the adjustment mechanism also includes a locking element, which is located at the connection between the lead screw and the hollow drill rod, and is used to lock the position of the lead screw after the pitch and angle of the helical blade are adjusted to the correct position.

[0019] The locking mechanism includes a locking disc, a positioning pin, and an elastic reset component. The locking disc is fixedly sleeved on the end of the lead screw, and multiple positioning holes are evenly distributed along the circumferential edge of the locking disc. A mounting seat is provided on the outer wall of the hollow drill rod corresponding to the position of the locking disc. The positioning pin passes through the mounting seat, with one end inserted into the positioning hole and the other end connected to an operating handle. The elastic reset component is a compression spring sleeved on the positioning pin, with one end abutting against the mounting seat and the other end abutting against the flange of the positioning pin, used to drive the positioning pin to maintain the locked state of being inserted into the positioning hole.

[0020] Furthermore, the lower end of the slag suction pipe is provided with a funnel-shaped suction port, the opening of the suction port is oriented towards the helical angle of the spiral blade, and a gap is left between the edge of the suction port and the inner wall of the spiral blade.

[0021] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the funnel-shaped suction inlet increases the sludge suction area, and the opening faces the direction of the spiral angle of the spiral blade, which matches the blade conveying trajectory and reduces the accumulation and blockage of sludge at the suction inlet; the gap setting between the suction inlet and the inner wall of the blade avoids rigid collision between the two, while ensuring that the sludge enters the sludge suction pipe smoothly, improving the sludge suction efficiency and reducing the frequency of pipe cleaning.

[0022] Furthermore, the surface of the helical blade is provided with a wear-resistant coating, which covers the slag-facing surface and the blade edge of the helical blade.

[0023] The wear-resistant coating is a composite ceramic coating, applied to the slag-facing surface and edges of the spiral blade using a thermal spraying process. The coating thickness is 0.3-0.8 mm, and it gradually increases in thickness from the blade root to the edge (the edge thickness is greater than the root thickness). The coating surface is sandblasted to form a rough texture (surface roughness Ra 3.2-6.3 μm) to enhance the friction with the slag. A transition layer (0.05-0.1 mm thick) is provided between the coating and the blade substrate. The transition layer is made of nickel-based alloy to improve the bonding strength between the coating and the substrate and prevent peeling.

[0024] The composite ceramic wear-resistant coating significantly improves the wear resistance of the propeller blades, especially for hard strata such as argillaceous sandstone mentioned in the document, which can reduce wear on the blade's slag-facing surface and edges (extending life by 2-3 times); the gradually thickened design and rough texture enhance the friction between the blade and the slag, preventing the slag from slipping; the transition layer prevents the coating from peeling off, ensuring stable wear resistance during long-term use and reducing equipment maintenance costs.

[0025] Furthermore, the lower end of the hollow drill rod is provided with a tapered guide head, the tip of which faces the bottom of the pile hole, and the maximum diameter of the guide head is smaller than the outer diameter of the helical blade.

[0026] The tapered guide head and the hollow drill pipe are detachably fixedly connected, specifically as follows: The lower end of the hollow drill rod is provided with an external thread, and the top of the tapered guide head is provided with an internal thread hole that matches the external thread. The two are connected by thread engagement. An annular sealing gasket (made of nitrile rubber) is provided between the top end face of the guide head and the bottom end face of the hollow drill rod to prevent sediment from entering the threaded connection. The outer wall of the guide head is uniformly provided with 3-4 reinforcing ribs along the circumference. The top of the reinforcing ribs is welded and fixed to the outer wall of the hollow drill rod to further improve the connection strength.

[0027] Furthermore, the adjustment mechanism also includes a drive component, which is located at the top of the hollow drill rod and is connected to the lead screw for transmission. The drive component drives the lead screw to rotate to achieve adjustment of the pitch and angle of the helical blades.

[0028] The driving component is a hand-cranked driving mechanism, including a driving gear, a driven gear, and a crank handle; The driven gear is fixedly sleeved on the top end of the lead screw and is coaxially arranged with the lead screw; The driving gear is mounted on the top end face of the hollow drill rod via a bearing seat and meshes with the driven gear (transmission ratio 1:3-1:5). The crank handle has an L-shaped structure, with one end fixedly connected to the axle of the drive gear and the other end provided with a non-slip rubber grip. A ratchet and pawl mechanism is provided between the drive gear and the bearing housing to prevent the crank handle from rotating in the opposite direction and to ensure the stability of the lead screw position during adjustment.

[0029] By turning the crank to drive the drive gear to rotate, and then driving the lead screw to rotate via the driven gear, the pitch and angle of the helical blades can be adjusted.

[0030] The hand-cranked drive mechanism makes turning the lead screw easier, and the transmission ratio design reduces the intensity of operation, making it suitable for manual operation on the construction site; the ratchet and pawl mechanism prevents the lead screw from rotating in the opposite direction during adjustment, ensuring that the pitch / angle is locked immediately after adjustment, avoiding parameter deviation due to misoperation; the anti-slip grip improves operational safety, especially suitable for wet or muddy construction environments.

[0031] Compared with the prior art, the beneficial effects of the rotary drilling pile cleaning device provided by this utility model are: Adjustable pitch and angle allow the helical blades to adapt to different types of sediment (such as moderately weathered mudstone sandstone fragments, silty clay sediments, etc.), avoiding the problems of "over-feeding" or "under-feeding"; the synergistic effect of the scraping teeth and the slag suction pipe thoroughly removes the attachments on the borehole wall and the sediment at the bottom of the borehole, providing a solid bearing layer for the pile foundation and ensuring that the bearing capacity of a single pile meets the standards. The dynamic adjustment mechanism reduces equipment replacement or process interruptions caused by changes in sediment type. The adjustment process is precisely controlled through the screw nut assembly and drive components, making it easy to operate. The conical guide head adapts to the lowering requirements of complex strata, reducing the risk of borehole collapse. In projects with complex geological conditions, such as wind tunnel foundations, it can reduce the rework rate of borehole cleaning and shorten the construction cycle. Wear-resistant coatings extend the service life of the propeller blades and reduce replacement frequency; locking components and guiding structures reduce wear on parts and lower maintenance costs; the solid-liquid separation design of the ground collection device enables centralized treatment of sediment, reducing environmental pollution. Overall, the total life-cycle cost of the device is significantly reduced, resulting in outstanding economic benefits. Attached Figure Description

[0032] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is an example diagram of a rotary drilling pile hole cleaning device; Figure 2 This is a side view of a rotary drilling pile cleaning device; Figure 3 This is a rear side view of a rotary drilling pile cleaning device; The attached diagram lists the components represented by each number as follows: 10. Hollow drill pipe; 11. Guide groove; 20. Spiral blade; 21. Blade unit; 30. Adjustment mechanism; 40. Slag suction assembly; 41. Slag suction pipe; 42. Ground collection device. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0035] like Figures 1-3 The diagram shows a first embodiment of a rotary drilling pile cleaning device provided by this utility model. In this embodiment, it includes a hollow drill rod 10, a spiral blade 20, an adjusting mechanism 30, and a slag suction assembly 40. The spiral blade 20 is spirally arranged along the axial direction of the hollow drill rod 10 and is rotatably connected to the hollow drill rod 10. The adjusting mechanism 30 is disposed on the hollow drill rod 10 and connected to the spiral blade 20, and is used to adjust the pitch and angle of the spiral blade 20. The slag suction assembly 40 includes a slag suction pipe 41 and a ground collection device 42. The slag suction pipe 41 penetrates the interior of the hollow drill rod 10, and its lower end corresponds to the sediment conveying area formed by the spiral blade 20, while its upper end is connected to the ground collection device 42.

[0036] In the above technical solution, the adjusting mechanism 30 includes a lead screw and nut assembly, which is arranged along the axial direction of the hollow drill rod 10. The two ends of the lead screw are rotatably connected to the hollow drill rod 10, and the nut is fixedly connected to the end of the spiral blade 20. When the lead screw is rotated, the nut moves along the axial direction of the lead screw, which drives the end of the spiral blade 20 to move synchronously to change the pitch.

[0037] Furthermore, in the above technical solution, the helical blade 20 includes multiple blade units 21, and adjacent blade units 21 are connected by hinges. The hinges are linked with the nuts of the lead screw nut assembly, and the movement of the nuts drives the adjacent blade units 21 to rotate around the hinges to adjust the blade angle.

[0038] Furthermore, in the above technical solution, the edge of the spiral blade 20 is provided with scraping teeth, which are evenly distributed along the circumference of the spiral blade 20, and the ends of the scraping teeth are adapted to the wall of the pile hole.

[0039] Furthermore, in the above technical solution, the outer wall of the hollow drill rod 10 is provided with a guide groove 11, the guide groove 11 extends along the axial direction of the hollow drill rod 10, and the inner side of the spiral blade 20 is provided with a guide block that cooperates with the guide groove. The guide block is embedded in the guide groove 11 and can slide along the groove.

[0040] Furthermore, in the above technical solution, the adjustment mechanism 30 also includes a locking element, which is located at the connection between the lead screw and the hollow drill rod 10, and is used to lock the position of the lead screw after the pitch and angle of the spiral blade 20 are adjusted to the correct position.

[0041] When the lead screw needs to be adjusted, pull the operating handle to disengage the locating pin from the locating hole and release the lock; after adjustment, release the operating handle, and the elastic reset component will push the locating pin back into the corresponding locating hole to achieve relative fixation between the lead screw and the hollow drill rod.

[0042] Furthermore, in the above technical solution, the lower end of the slag suction pipe 41 is provided with a funnel-shaped suction port, the opening of the suction port is facing the helical angle direction of the spiral blade 20, and a gap is left between the edge of the suction port and the inner wall of the spiral blade 20.

[0043] Furthermore, in the above technical solution, the surface of the spiral blade 20 is provided with a wear-resistant coating, which covers the slag-facing surface and the blade edge of the spiral blade 20.

[0044] Furthermore, in the above technical solution, the lower end of the hollow drill rod 10 is provided with a tapered guide head, the tip of which faces the bottom of the pile hole, and the maximum diameter of the guide head is smaller than the outer diameter of the spiral blade 20.

[0045] Furthermore, in the above technical solution, the adjustment mechanism 30 also includes a driving component, which is located at the top of the hollow drill rod 10 and connected to the lead screw drive. The driving component drives the lead screw to rotate to realize the pitch and angle adjustment of the spiral blade 20.

[0046] Specifically, the principle of this utility model is as follows: The core of the device lies in the synergistic effect of the helical blades and the adjustment mechanism. The helical blades are spirally arranged along the axial direction of the hollow drill rod and are hinged to the blade units via a screw-nut assembly, enabling real-time adjustment of the pitch and angle. When encountering thick, hard sediment, the drive component (such as a hand-cranked gear mechanism) rotates the screw, causing the nut to move axially along the screw, pushing the blade units to unfold around the hinge, increasing the pitch to improve the single-pass conveying capacity; simultaneously, the contact angle between the blades and the bottom of the borehole increases, enhancing the gripping force on the sediment. For loose sediment, reverse adjustment reduces the pitch and narrows the angle, preventing sediment from scattering during conveying and improving conveying stability. This dynamic adjustment mechanism breaks through the limitations of traditional fixed structures, ensuring that the blades are always matched to the characteristics of the sediment. As the spiral blades rotate, the scraping teeth on their edges directly act on the borehole wall, removing adhering mud and rock cuttings and preventing secondary sediment buildup. Simultaneously, the slag suction pipe inside the hollow drill pipe corresponds to the slag conveying area enclosed by the blades. The funnel-shaped suction inlet expands the suction range, and together with the negative pressure pump of the surface collection device, a negative pressure field is created, allowing the slag conveyed by the blades to smoothly enter the pipe. The scraping, conveying, and slag suction processes are seamlessly integrated, forming a closed loop of "borehole wall cleaning - slag collection - efficient discharge," ensuring no residue remains at the bottom or on the borehole wall. Locking components (such as locking discs and positioning pins) fix the screw position after adjustment, preventing parameter deviations caused by construction vibrations; wear-resistant coatings (such as composite ceramic coatings) extend the service life of the blades in hard rock and slag environments by enhancing the surface hardness and friction; the tapered guide head is fixed to the hollow drill rod via a threaded connection, guiding the device to descend smoothly and dispersing the bottom pressure to prevent the equipment from sinking into soft strata. These structural designs ensure stable operation of the device from three dimensions: adjustment accuracy, durability, and operational safety.

Claims

1. A device for cleaning holes in rotary drilling piles, characterized in that, The system includes a hollow drill rod, spiral blades, an adjusting mechanism, and a slag suction assembly. The spiral blades are spirally arranged along the axial direction of the hollow drill rod and are rotatably connected to the hollow drill rod. The adjusting mechanism is located on the hollow drill rod and connected to the spiral blades, and is used to adjust the pitch and angle of the spiral blades. The slag suction assembly includes a slag suction pipe and a ground collection device. The slag suction pipe penetrates the interior of the hollow drill rod, with its lower end corresponding to the slag conveying area formed by the spiral blades and its upper end connected to the ground collection device.

2. The rotary drilling pile cleaning device according to claim 1, characterized in that, The adjusting mechanism includes a lead screw and nut assembly, which is arranged along the axial direction of the hollow drill rod. The two ends of the lead screw are rotatably connected to the hollow drill rod, and the nut is fixedly connected to the end of the helical blade. When the lead screw is rotated, the nut moves along the axial direction of the lead screw, causing the end of the helical blade to move synchronously to change the pitch.

3. The rotary drilling pile cleaning device according to claim 2, characterized in that, The helical blade includes multiple blade units, which are connected by hinges. The hinges are linked to the nuts of the lead screw and nut assembly. The movement of the nuts drives the adjacent blade units to rotate around the hinges to adjust the blade angle.

4. The rotary drilling pile hole cleaning device according to claim 3, characterized in that, The edge of the spiral blade is provided with scraping teeth, which are evenly distributed along the circumference of the spiral blade, and the ends of the scraping teeth are adapted to the wall of the pile hole.

5. A rotary drilling pile cleaning device according to claim 4, characterized in that, The outer wall of the hollow drill rod is provided with a guide groove, which extends along the axial direction of the hollow drill rod. The inner side of the helical blade is provided with a guide block that cooperates with the guide groove. The guide block is embedded in the guide groove and can slide along the groove.

6. A rotary drilling pile cleaning device according to claim 5, characterized in that, The adjustment mechanism also includes a locking element, which is located at the connection between the lead screw and the hollow drill rod, and is used to lock the position of the lead screw after the pitch and angle of the spiral blade are adjusted to the correct position.

7. A rotary pile cleaning device according to claim 6, characterized in that, The lower end of the slag suction pipe is provided with a funnel-shaped suction port, the opening of which faces the helical angle of the spiral blade, and a gap is left between the edge of the suction port and the inner wall of the spiral blade.

8. A rotary drilling pile cleaning device according to claim 7, characterized in that, The surface of the spiral blade is provided with a wear-resistant coating, which covers the slag-facing surface and the blade edge of the spiral blade.

9. A rotary drilling pile cleaning device according to claim 8, characterized in that, The lower end of the hollow drill rod is provided with a tapered guide head, the tip of which faces the bottom of the pile hole. The maximum diameter of the guide head is smaller than the outer diameter of the spiral blade.

10. A rotary pile cleaning device according to claim 9, characterized in that, The adjustment mechanism also includes a drive component, which is located at the top of the hollow drill rod and is connected to the lead screw. The drive component drives the lead screw to rotate to adjust the pitch and angle of the helical blades.

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