Multi-layer mutual shearing stirring drilling tool and stirring drilling machine

Abstract

The invention provides a multi-layer mutual shearing stirring drilling tool and a stirring drilling machine. The drilling tool comprises a drilling rod, a stirring frame and stirring wings. The drill rod comprises a first drill rod and a second drill rod; the first drill rod and the second drill rod are coaxially arranged and can relatively rotate around the axes of the first drill rod and the second drill rod; the stirring frame is arranged on the outer side of the drill rod; one end of the stirring frame is connected with the first drill rod and can rotate along with the first drill rod; the other end of the stirring frame is movably connected with the second drill rod and can rotate on the second drill rod; the stirring wing comprises an inner stirring wing, and the inner stirring wing is arranged on the outer side wall of the second drill rod and can rotate along with the second drill rod; the inner stirring wings can be unfolded in the direction of the stirring frame when the second drill rod rotates. According to the scheme, the stirring wings are driven to be unfolded through rotation of the drill rod, so that the reducing structure of the drill bit assembly is simpler, and the design is more ingenious and reasonable.

Description

Technical Field

[0001] This invention belongs to the field of mixing drilling technology, specifically relating to a multi-layer shear mixing drill and a mixing drilling machine. Background Technology

[0002] Due to complex geological environments, drilling operations often encounter the problem of weak strata interlayers, requiring reinforcement of the pile body. Increasing the pile diameter along its entire length using a mixing pile method would result in material waste. Therefore, increasing the pile diameter in specific weak strata is an effective solution. In existing technology, Chinese patent CN 219930947 U mentions a variable-diameter, multi-layer, bidirectional shear mixing drilling rig. This mixing drill bit structure can expand the pile diameter through jetting, but it presents challenges in precisely controlling the pile diameter and ensuring the quality of the expanded section, potentially affecting the safe operation of the mixing pile later. Furthermore, the variable-diameter structure of this mixing drill bit is relatively complex and costly.

[0003] Given the technical problems existing in the structure of the aforementioned mixing drilling rig, there is no effective and reasonable solution yet. Therefore, it is urgent to seek new technologies to solve these problems, realize the one-time construction of piles of different diameters in various strata, and adapt to the construction needs of mixing piles under complex geological conditions. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of the above-mentioned technologies by proposing a multi-layer shear mixing drill and mixing drill to solve the problems of complex structure and inability to effectively guarantee the construction quality of variable diameter mixing drills.

[0005] This invention provides a multi-layer shear mixing drill bit that can achieve pile diameter variation by rotating the wing plate. The drill bit includes a drill rod, a mixing frame, and mixing wings. The drill rod includes a first drill rod and a second drill rod. The first drill rod and the second drill rod are coaxially arranged and can rotate relative to each other around their axis. The mixing frame is disposed on the outside of the drill rod. One end of the mixing frame is connected to the first drill rod and can rotate with the first drill rod. The other end of the mixing frame is movably connected to the second drill rod and can rotate on the second drill rod. The mixing wings include an inner mixing wing, which is disposed on the outer wall of the second drill rod and can rotate together with the second drill rod. The inner mixing wing can unfold towards the mixing frame when the second drill rod rotates.

[0006] In some embodiments, the stirring blade also includes an outer stirring blade, which is disposed on the inner sidewall of the stirring frame and can rotate with the stirring frame; the outer stirring blade can unfold towards the second drill pipe when the stirring frame rotates.

[0007] In some embodiments, the second drill rod rotates in the opposite direction to the stirring frame; when the second drill rod rotates clockwise, the inner stirring blades unfold toward the stirring frame; when the stirring frame rotates counterclockwise, the outer stirring blades unfold toward the second drill rod.

[0008] In some embodiments, the stirring blade includes a wing base and a blade; one end of the blade is inserted into a slot in the wing base and is hinged to the wing base via a hinge; the blade can rotate around the hinge to a preset angle within the slot; the wing base is fixedly disposed on the outer side wall of the second drill rod; or, the wing base is fixedly disposed on the inner side wall of the stirring frame.

[0009] In some embodiments, the wing is inclinedly disposed on the outer side wall of the second drill rod or the inner side wall of the stirring frame, and the angle α between the wing and the horizontal direction is 0° to 20° when the drill rod is placed in the vertical direction.

[0010] In some embodiments, the stirring frame is movably disposed on the outside of the drill rod; one end of the stirring frame is movably connected to the first drill rod and can extend and retract radially along the first drill rod; the other end of the stirring frame is movably connected to the second drill rod and can extend and retract radially along the second drill rod; the stirring frame can unfold in the opposite direction to the first drill rod when the first drill rod rotates.

[0011] In some embodiments, one end of the stirring frame is movably connected to the first drill rod via a first sliding pin; one end of the first sliding pin is fixedly connected to the first drill rod; the other end of the first sliding pin is movably disposed at one end of the stirring frame and is capable of radial extension and retraction along the first drill rod at one end of the stirring frame; and / or, the other end of the stirring frame is movably connected to the second drill rod via a second sliding pin; one end of the second sliding pin is fixedly connected to the second drill rod; the other end of the second sliding pin is movably disposed at the other end of the stirring frame and is capable of radial extension and retraction along the second drill rod at the other end of the stirring frame.

[0012] In some embodiments, multiple inner stirring blades are staggered along the axial direction of the second drill pipe on the outer side wall of the second drill pipe.

[0013] In some embodiments, the drilling tool further includes a drill bit with drill wings on its outer wall; the drill bit is disposed at the end of the second drill rod; the drill bit and the second drill rod are coaxially arranged and can rotate relative to each other about their axis.

[0014] This application also provides a mixing drill, including a multi-layer shear mixing drill tool, wherein the multi-layer shear mixing drill tool is the aforementioned multi-layer shear mixing drill tool.

[0015] The multi-layer shear mixing drill bit and mixing drill machine provided in this application have the following technical effects: First, the proposed solution uses the rotation of the drill rod to drive the agitator blades to unfold, making the variable diameter structure of the drill bit simpler and the design more ingenious and reasonable.

[0016] Secondly, the proposed solution utilizes the rotation of the drill rod to drive the mixing frame to unfold, thereby enabling the drill bit to have a variable diameter function, which can meet the construction requirements of different pile diameters.

[0017] Third, the proposed solution, by designing a telescopic mixing wing in conjunction with a telescopic mixing frame, enables efficient variable diameter construction of expanded piles, reduces material consumption and saves construction time, significantly improves the uniformity and pile strength of bidirectional mixing piles, and comprehensively improves construction quality. Attached Figure Description

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0019] The present invention will be further described below with reference to the accompanying drawings: Figure 1 This is a schematic diagram of the overall structure of a mixing drill according to the present invention.

[0020] Figure 2 This is a schematic diagram of an embodiment of a multi-layer shear stirring drill tool according to the present invention.

[0021] Figure 3 This is a schematic diagram of a second embodiment of a multi-layer shear stirring drill tool according to the present invention.

[0022] Figure 4 This is a schematic diagram of a third embodiment of a multi-layer shear stirring drill tool according to the present invention.

[0023] Figure 5 This is a schematic diagram of the retraction of the stirring blade in this invention.

[0024] Figure 6 This is a schematic diagram of the deployment of the stirring blade of the present invention.

[0025] Figure 7 This is a schematic diagram of the rotation of a multi-layer shear stirring drill tool according to the present invention.

[0026] Figure 8 This is a schematic diagram of the stirring blade of the present invention.

[0027] Figure 9 This is a schematic diagram of the construction state of a mixing drilling rig according to the present invention. Figure 1 .

[0028] Figure 10 This is a schematic diagram of the construction state of a mixing drilling rig according to the present invention. Figure 2 .

[0029] Figure 11 This is a schematic diagram of the construction state of a mixing drilling rig according to the present invention. Figure 3 .

[0030] Figure 12 This is a schematic diagram of the construction state of a mixing drilling rig according to the present invention. Figure 4 .

[0031] Figure 13This is a schematic diagram of the construction state of a mixing drilling rig according to the present invention. Figure 5 .

[0032] Figure 14 This is a schematic diagram of the construction state of a mixing drilling rig according to the present invention. Figure 6 .

[0033] In the diagram: 1. Drilling tool; 11. First drill rod; 12. Mixing frame; 13. Second drill rod; 14. Inner mixing blade; 141. Blade seat; 142. Blade; 143. Hinge; 15. Drill head; 16. Drill blade; 17. Outer mixing blade; 18. Sliding pin; 2. Drill rod assembly; 3. Power unit; 4. Drill rig frame; 5. Support; 6. Wire rope; 7. Soil layer. Detailed Implementation

[0034] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0035] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0036] Furthermore, the terms "first" and "second" 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, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified. "Several" means one or more, unless otherwise explicitly specified.

[0037] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention 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. Therefore, they should not be construed as limitations on this invention.

[0038] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0039] As shown in Figure 2 to Figure 8 As shown, this invention provides a multi-layer shear mixing drill bit, which can achieve lateral expansion and contraction of diameter through the rotation of the blades. The drill bit includes a drill rod, a mixing frame 12, and mixing blades; wherein, the drill rod includes a first drill rod 11 and a second drill rod 13; the first drill rod 11 and the second drill rod 13 are coaxially arranged and can rotate relative to each other around their axis. The second drill rod 13 can be disposed inside the first drill rod 11, and the first drill rod 11 and the second drill rod 13 are driven separately by different drive mechanisms, thereby enabling various independent rotation operations. A stirring frame 12 is disposed on the outer side of the drill rod. The stirring frame 12 can be a concave structure, a semi-circular structure, or an arc-shaped structure. One end of the stirring frame 12 is connected to the first drill rod 11 and can rotate with the first drill rod 11. The other end of the stirring frame 12 is movably connected to the second drill rod 12 and can rotate on the second drill rod 13. That is, the other end of the stirring frame 12 does not rotate with the second drill rod 13. The other end of the stirring frame 12 can be fitted onto the second drill rod 13 through an adapter sleeve, and can rotate on the second drill rod 13 within the adapter sleeve. The stirring blade includes an inner stirring blade 14, which is disposed on the outer wall of the second drill rod 13 and can rotate with the second drill rod 13. When the second drill rod 13 rotates, the inner stirring blade 14 can unfold towards the stirring frame 12. Specifically, when the inner stirring blade 14 is in a retracted state, when the second drill rod 13 rotates, the inner stirring blade 14 can unfold outward along the radial direction of the second drill rod 13. The inner stirring blade 14 includes a wing seat 141 and a blade 142 that are interchangeable. Specifically, when the second drill rod 13 rotates, under the action of centrifugal force, the blade 142 unfolds relative to the wing seat 141 until it is locked together with the wing seat 141. When the second drill rod 13 stops rotating, it can retract into the wing seat 141 or remain in the unfolded state. The multi-layer shear stirring drill tool designed in this invention uses the rotation of the drill rod to drive the stirring blade to unfold. This design is more ingenious and reasonable, simplifies the structure of the drill tool, realizes the lateral extension and diameter change function of the drill tool, reduces costs, reduces construction difficulty, and reduces construction safety issues.

[0040] In some embodiments, the stirring frame 12 is fitted onto the second drill rod 13 via an adapter sleeve and can float up and down a certain distance along the length of the second drill rod 13 to improve the uniformity of stirring. In one example, the stirring frame 12 is fitted onto the second drill rod 13 via an adapter sleeve and can float up and down 15cm along the length of the second drill rod 13. A telescopic mechanism, such as a telescopic cylinder, can be provided. The cylinder body of the telescopic mechanism is fixed to the second drill rod 13, and the telescopic rod of the telescopic mechanism is connected to the stirring frame 12. The telescopic mechanism controls the stirring frame 12 to float up and down periodically along the length of the second drill rod 13.

[0041] As shown in Figure 2 to Figure 8 As shown, in some embodiments, the mixing blades further include an outer mixing blade 17, which can be disposed on the inner sidewall of the mixing frame 12 and can rotate with the mixing frame 12. Specifically, the outer mixing blade 17 can unfold towards the second drill rod 13 when the mixing frame 12 rotates, that is, the unfolding direction of the outer mixing blade 17 is opposite to the unfolding direction of the inner mixing blade 14. The inner and outer mixing blades are arranged opposite to each other, which facilitates bidirectional shearing of the grout and soil when forming the variable diameter pile, making the two more uniformly mixed and the resulting pile more solid. By adopting the above scheme, by designing the outer mixing blade 17 to unfold in coordination with the inner mixing blade 14, a transversely expanding and contracting shearing mixing structure can be fully formed, so that the grout and soil layer can be uniformly mixed. Specifically, the inner mixing blade 14 can unfold towards the mixing frame 12, that is, radially towards the second drill rod, when the second drill rod 13 rotates. When the second drill rod rotates clockwise, the inner mixing blade gradually expands outward under the action of centrifugal force and soil reaction force, embedding into the pre-reserved expansion slot of the mixing frame to increase the pile diameter. When the second drill rod rotates counterclockwise, the inner mixing blade retracts to fit against the outer wall of the drill rod under the guidance of the spiral guide rail, reducing drilling resistance. The outer mixing blade 17 rotates synchronously with the mixing frame. During clockwise rotation, it retracts inward under the action of soil pressure to avoid idling disturbance. When rotating counterclockwise to form the pile, the mixing frame opens through the screw, and the outer mixing blade 17 expands under the action of centrifugal force and soil reaction force, stabilizing the cutting of the soil. The scheme proposed in this application, through the coordinated control of the forward and reverse rotation of two sets of drill rods, precisely adjusts the extension and contraction sequence and amplitude of the inner and outer mixing blades, realizing the integrated operation of shear mixing of multi-layer soil and variable diameter pile formation, significantly improving the uniformity and bearing capacity of the pile body. This construction method is applicable to various geological conditions such as soft soil, clay, and sand layers.

[0042] As shown in Figure 2 to Figure 8 As shown, in some embodiments, the second drill rod 13 rotates in the opposite direction to the stirring frame 12. (See reference...) Figure 3 and 7As shown, when the second drill rod 13 rotates clockwise in the direction F, the inner stirring blade 14 unfolds towards the stirring frame 12; when the stirring frame 12 rotates counterclockwise in the direction f, the outer stirring blade 17 unfolds towards the second drill rod 13. By employing this design, and by designing the second drill rod 13 and the stirring frame 12 to rotate in opposite directions, and by achieving the unfolding of their respective stirring blades, an alternating stirring effect is achieved.

[0043] Figure 5 to Figure 8 As shown, in some embodiments, the stirring blade may include a wing base 141 and a blade 142; wherein one end of the blade 142 is inserted into a slot in the wing base 141 and is hinged to the wing base 141 via a hinge 143. Specifically, the blade 142 can rotate within the slot around the hinge 143 to a preset angle, preferably 150° to 180°; preferably, when the blade 142 is fully deployed under centrifugal force, it forms a 180° angle with the wing base 141, thus forming a maximum diameter blade for stirring. The wing base 141 is fixedly mounted on the outer wall of the second drill rod 13.

[0044] Refer to Figure 5 to Figure 8 As shown, in some embodiments, the stirring blade includes a wing base 141 and a blade 142; one end of the blade 142 is inserted into a slot in the wing base 141 and is hinged to the wing base 141 via a hinge 143. The blade 142 can rotate within the slot around the hinge 143 to a preset angle, preferably 150° to 180°. The wing base 141 is fixedly mounted on the inner wall of the stirring frame 12.

[0045] refer to Figure 8 As shown, in some embodiments, the wing seat 141 is inclinedly disposed on the outer wall of the second drill rod 13 or the inner wall of the mixing frame 12. This design can make full use of the inclination angle to improve the mixing force of the mixing blade. Specifically, when the drill rod is placed vertically, the angle α between the wing seat 141 and the horizontal direction is 0° to 20°, preferably 6°, 8°, 10° or 16°, which can be selected according to the structure of the soil layer. It should be noted that the size of this angle α is quite important. If the angle is too large, the mixing blade will be subjected to excessive force, resulting in excessive wear and is not conducive to construction. If the angle is too small, the construction efficiency will be low.

[0046] The wing seat 141 of this application is inclinedly disposed on the outer wall of the second drill rod 13 or the inner wall of the mixing frame 12, forming a preset angle to optimize the cutting angle of the mixing blade when it unfolds, thereby enhancing the shearing and mixing efficiency of the soil. When the soil strength is low, the included angle α is taken as a large value; when the soil strength is high, the included angle α is taken as a small value, ensuring that the soil layer around the pile is fully mixed. This included angle α design, in conjunction with the forward and reverse rotation linkage mechanism of the drill rod, effectively controls the dynamic response characteristics of the mixing blade, further improving the uniformity of pile quality and the density of the structure. It should be noted that the distance between the two mixing blades needs to be considered when designing the included angle α to avoid mutual interference between adjacent mixing blades during rotation.

[0047] As shown in Figure 2 to Figure 4 As shown, in some embodiments, the mixing frame 12 is movably disposed on the outside of the drill rod. One end of the mixing frame 12 is movably connected to the first drill rod 11 and can extend and retract radially along the first drill rod 11; the other end of the mixing frame 12 is movably connected to the second drill rod 13 and can extend and retract radially along the second drill rod 13. The mixing frame 12 can unfold in the direction away from the first drill rod 11 when the first drill rod 11 rotates. Alternatively, the mixing frame 12 can be driven to unfold by a lead screw assembly; the lead screw assembly includes a lead screw and a motor; one end of the mixing frame 12 is connected to the first drill rod 11 via the lead screw; the lead screw is driven by the motor to push the mixing frame 12 to extend and retract radially along the first drill rod 11. By adopting the above scheme, the mixing frame is extended and retracted laterally by rotating the first drill rod, thereby realizing the diameter change function. This enables free diameter change and shearing, eliminating the need to change drilling tools during pile driving. It overcomes the defect of conventional variable diameter piles where the pile diameter does not meet the design requirements and allows for precise control of the pile diameter.

[0048] As shown in Figure 2 to Figure 4 As shown, in some embodiments, both ends of the mixing frame 12 are movably connected to the drill rod via sliding pins 18. Specifically, the sliding pins 18 include a first sliding pin and a second sliding pin; wherein, one end of the mixing frame 12 is movably connected to the first drill rod 11 via the first sliding pin; one end of the first sliding pin is fixedly connected to the first drill rod 11; the other end of the first sliding pin is movably disposed at one end of the mixing frame 12 and can extend and retract radially along the first drill rod 11 at one end of the mixing frame 12; the other end of the mixing frame 12 is movably connected to the second drill rod 13 via the second sliding pin; one end of the second sliding pin is fixedly connected to the second drill rod 13; the other end of the second sliding pin is movably disposed at the other end of the mixing frame 12 and can extend and retract radially along the second drill rod 13 at the other end of the mixing frame 12. Using the above scheme, when the first drill rod 11 rotates, under the action of centrifugal force, the entire mixing frame 12 can expand radially along the drill rod, realizing a diameter-changing function. The specific diameter-changing size is designed according to the actual pile diameter.

[0049] As shown in Figure 2 to Figure 8As shown, in some embodiments, multiple inner stirring blades 14 are staggered along the axial direction of the second drill rod 13 on the outer side wall of the second drill rod 13, thereby forming a fully stirring structure that can effectively improve the stirring effect.

[0050] As shown in Figure 2 to Figure 8 As shown, in some embodiments, the drilling tool further includes a drill bit 15, on the outer wall of which a drill wing 16 is provided; the drill bit 15 is disposed at the end of the second drill rod 13; the drill bit 15 and the second drill rod 13 are coaxially arranged and can rotate relative to each other about their axis.

[0051] As shown in Figure 1, the present invention also provides a mixing drill, including a drill bit 1, a drill rod assembly 2, a power unit 3, a drill frame 4, a support 5, and a wire rope 6. The drill bit 1 is the aforementioned multi-layer shear mixing drill bit. Specifically, the power unit 3 is mounted on the drill frame 4 and is used to provide power to the drill rod assembly 2; further, the drill rod assembly 2 is connected to the drill bit 1, and the power unit 3 is connected to the drill rod assembly 2 via the wire rope 6 to achieve power transmission. The drill rod assembly 2 includes a power drill rod, which includes multiple layers of sleeve rods. These multiple layers of sleeve rods are interlocked and can rotate independently around the same axis, thereby driving different drill rods to rotate. The specific construction process of the mixing drill proposed in this application is shown in Figures 9 to 9. Figure 14 As shown.

[0052] The multi-layer shear mixing drill bit and mixing drill machine provided in this application have the following technical effects: First, the proposed solution uses the rotation of the drill rod to drive the agitator blades to unfold, making the variable diameter structure of the drill bit simpler and the design more ingenious and reasonable.

[0053] Secondly, the proposed solution utilizes the rotation of the drill rod to drive the mixing frame to unfold, thereby enabling the drill bit to have a variable diameter function, which can meet the construction requirements of different pile diameters.

[0054] Third, the proposed solution, by designing a telescopic mixing wing in conjunction with a telescopic mixing frame, enables efficient variable diameter construction of expanded piles, reduces material consumption and saves construction time, significantly improves the uniformity and pile strength of bidirectional mixing piles, and comprehensively improves construction quality.

[0055] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the present invention. Any person skilled in the art can make many possible variations and modifications to the technical solution of the present invention, or modify it into equivalent embodiments, without departing from the scope of the present invention. Therefore, any modifications, equivalent changes, and alterations made to the above embodiments based on the technology of the present invention without departing from the scope of the present invention are within the protection scope of the present invention.

Claims

1. A multi-layer intermeshing mixing auger characterized by, The drilling tool includes a drill rod, a stirring frame (12), and stirring blades; The drill rod includes a first drill rod (11) and a second drill rod (13); the first drill rod (11) and the second drill rod (13) are coaxially arranged and can rotate relative to each other about their axis; The stirring frame (12) is disposed on the outside of the drill rod; one end of the stirring frame (12) is connected to the first drill rod (11) and can rotate with the first drill rod (11); the other end of the stirring frame (12) is movably connected to the second drill rod (12) and can rotate on the second drill rod (13); The stirring blade includes an inner stirring blade (14), which is disposed on the outer side wall of the second drill rod (13) and can rotate together with the second drill rod (13); the inner stirring blade (14) can unfold towards the stirring frame (12) when the second drill rod (13) rotates.

2. The multi-layer shear mixing drill bit according to claim 1, characterized in that, The stirring blade also includes an outer stirring blade (17), which is disposed on the inner side wall of the stirring frame (12) and can rotate with the stirring frame (12); the outer stirring blade (17) can unfold towards the second drill rod (13) when the stirring frame (12) rotates.

3. The multi-layer shear mixing drill bit according to claim 2, characterized in that, The second drill rod (13) rotates in the opposite direction to the stirring frame (12); when the second drill rod (13) rotates clockwise, the inner stirring blade (14) unfolds toward the stirring frame (12); when the stirring frame (12) rotates counterclockwise, the outer stirring blade (17) unfolds toward the second drill rod (13).

4. The multi-layer shear mixing drill bit according to any one of claims 1 to 3, characterized in that, The stirring blade includes a wing base (141) and a blade (142); one end of the blade (142) is inserted into a slot in the wing base (141) and is hinged to the wing base (141) via a hinge (143); the blade (142) can rotate around the hinge (143) in the slot to a preset angle; The wing seat (141) is fixedly disposed on the outer side wall of the second drill rod (13); or, the wing seat (141) is fixedly disposed on the inner side wall of the stirring frame (12).

5. The multi-layer shear mixing drill bit according to claim 4, characterized in that, The wing seat (141) is inclinedly disposed on the outer side wall of the second drill rod (13) or on the inner side wall of the stirring frame (12), and when the drill rod is placed in the vertical direction, the angle α between the wing seat (141) and the horizontal direction is 0° to 20°.

6. The multi-layer shear mixing drill bit according to claim 1, characterized in that, The stirring frame (12) is movably disposed on the outside of the drill rod; one end of the stirring frame (12) is movably connected to the first drill rod (11) and can extend and retract radially along the first drill rod (11); the other end of the stirring frame (12) is movably connected to the second drill rod (12) and can extend and retract radially along the second drill rod (13); the stirring frame (12) can unfold in the direction away from the first drill rod (11) when the first drill rod (11) rotates.

7. The multi-layer shear mixing drill bit according to claim 6, characterized in that, One end of the stirring frame (12) is movably connected to the first drill rod (11) via a first sliding pin; one end of the first sliding pin is fixedly connected to the first drill rod (11); the other end of the first sliding pin is movably disposed at one end of the stirring frame (12) and is capable of radial extension and retraction along the first drill rod (11) at one end of the stirring frame (12); and / or, The other end of the stirring frame (12) is movably connected to the second drill rod (13) via a second sliding pin; one end of the second sliding pin is fixedly connected to the second drill rod (13); the other end of the second sliding pin is movably disposed at the other end of the stirring frame (12) and can extend and retract radially along the second drill rod (13) at the other end of the stirring frame (12).

8. The multi-layer shear mixing drill bit according to claim 1, characterized in that, Multiple inner stirring blades (14) are staggered along the axial direction of the second drill rod (13) on the outer side wall of the second drill rod (13).

9. The multi-layer shear mixing drill bit according to claim 1, characterized in that, The drilling tool also includes a drill bit (15), on the outer wall of which a drill wing (16) is provided; the drill bit (15) is located at the end of the second drill rod (13); the drill bit (15) and the second drill rod (13) are coaxially arranged and can rotate relative to each other around their axis.

10. A mixing drill, comprising a multi-layer shear mixing drill bit (1), characterized in that, The multi-layer shear mixing drill bit (1) is the multi-layer shear mixing drill bit as described in any one of claims 1 to 9.

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