A passively driven multidimensional bidirectional stirring drill bit

Abstract

This utility model discloses a passively driven multi-dimensional bidirectional mixing drill bit, belonging to the field of pile foundation equipment. It includes an inner drill rod, an outer drill rod, an inner mixing system, and an outer mixing system. The rotation of the inner drill rod drives the first inner mixing blade, the second inner mixing blade, and the agitator blade to rotate around the central axis of the inner drill rod. The rotation of the outer drill rod drives the first outer mixing blade, the second outer mixing blade, the third outer mixing blade, and the third inner mixing blade to rotate around the central axis of the inner drill rod. Simultaneously, the agitator blade drives the third outer mixing blade to rotate around the first transverse axis. This utility model, through forced mixing in two dimensions, uniformly cuts the undisturbed soil. Theoretically, the soil is cut into strip-like structures; however, due to the low viscosity of the soil and repeated multi-layer cutting, the entire undisturbed soil is divided into fine particles and uniformly mixed with the curing agent, ensuring the uniformity of the pile body.

Description

Technical Field

[0001] This utility model relates to the field of pile foundation equipment, and in particular to a passively driven multidimensional bidirectional mixing drill bit. Background Technology

[0002] Soft soil refers to fine-grained soil naturally deposited in coastal areas, lakes, valleys, and riverbanks, characterized by high water content, large void ratio, high compressibility, and low shear strength. The construction of more and more highways, railways, and ports inevitably passes through soft soil foundation areas, and strengthening the foundation with cement-soil mixing piles is a common improvement measure. Two-way mixing piles utilize cement / hardener as the solidification material. Through specialized mixing machinery and grouting pumps, the soft soil and solidification material are forcibly mixed deep within the foundation. A series of physicochemical reactions between the solidification material and the soft soil cause the soft soil to harden into a composite foundation with integrity, water stability, and high bearing capacity.

[0003] Currently, the biggest problem in bidirectional mixing construction is the uneven mixing of the sprayed medium (cement slurry or powder) with the soil layer. Especially in clay soil layers, the soil is difficult to break up during mixing, resulting in a blocky structure that the curing agent struggles to integrate. Therefore, a fundamental improvement to the design of existing mixing drill bits is essential; otherwise, the applicability of the bidirectional mixing process will be limited. Based on this, this invention proposes a passively driven, multi-dimensional bidirectional mixing drill bit. Summary of the Invention

[0004] To address the aforementioned technical problems in existing technologies, this utility model proposes a passively driven multi-dimensional bidirectional mixing drill bit, overcoming the shortcomings of the prior art. By setting up a first inner mixing blade, a second inner mixing blade, a first outer mixing blade, and a second outer mixing blade to form horizontal forced mixing, the undisturbed soil is cut into sheet-like structures. By setting up a third outer mixing blade to form vertical forced mixing, the sheet-like structures are further cut into strip-like structures. Through forced mixing in two dimensions, the undisturbed soil is cut uniformly. Theoretically, the soil is cut into strip-like structures, but due to the low viscosity of the soil and repeated multi-layer cutting, the entire undisturbed soil is divided into fine particles, which are then uniformly mixed with the curing agent, ensuring the uniformity of the pile body.

[0005] A passively driven multidimensional bidirectional stirring drill bit includes an inner drill rod, an outer drill rod, an inner stirring system, and an outer stirring system. The lower end of the outer drill rod is connected to the inner drill rod through a sealing sleeve.

[0006] The external stirring system includes a first external stirring blade, a second external stirring blade, and a third external stirring blade. The first external stirring blade, the second external stirring blade, and the third external stirring blade are connected to a vertical connecting structure to form a frame structure. The upper end of the frame structure is connected to the outer drill rod by welding or bolts, and the lower end of the frame structure is rotatably connected to the inner drill rod. The third external stirring blade includes a first horizontal shaft, a first rotating sleeve, and an external crushing blade. The external crushing blade is connected to the first rotating sleeve. The first rotating sleeve rotates around the central axis of the first horizontal shaft. A transverse connecting rod is provided between the two layers of blades on the side of the external crushing blade closest to the outer drill rod.

[0007] The inner drill rod drives the inner stirring system, which is welded or bolted together. The inner stirring system includes a first inner stirring blade, a second inner stirring blade, and a deflecting blade. The first inner stirring blade, the second inner stirring blade, and the deflecting blade are all connected to the inner drill rod by welding or bolting. The distance between the outer crushing blade, which is closest to the outer drill rod, and the inner drill rod is L. The length of the deflecting blade is greater than L.

[0008] The rotation of the inner drill rod causes the first inner stirring blade, the second inner stirring blade, and the agitator blade to rotate around the central axis of the inner drill rod. The rotation of the outer drill rod causes the first outer stirring blade, the second outer stirring blade, and the third outer stirring blade to rotate around the central axis of the inner drill rod. At the same time, the agitator blade causes the third outer stirring blade to rotate around the first transverse axis.

[0009] Preferably, the second inner stirring blade consists of 1-3 layers of blades, and the second outer stirring blade consists of 1-3 layers of blades, and the second inner stirring blade and the second outer stirring blade have the same number of blade layers.

[0010] Preferably, the outer breaking blades consist of 2-6 layers, each layer consisting of 2-8 blades, with the blades evenly arranged.

[0011] Preferably, the material strength of the two layers of blades closest to the outer drill pipe in the agitator blade and the outer crusher blade is higher than that of the other blades.

[0012] The beneficial technical effects of this utility model are as follows:

[0013] By setting up a first inner mixing blade, a second inner mixing blade, a first outer mixing blade, and a second outer mixing blade to form a horizontally forced mixing process, the undisturbed soil is cut into a sheet-like structure. A third outer mixing blade forms a vertically forced mixing process, further cutting the sheet-like structure into a strip-like structure. Through forced mixing in two dimensions, the undisturbed soil is cut uniformly. Theoretically, the soil is cut into a strip-like structure, but due to the low viscosity of the soil and repeated multi-layer cutting, the entire undisturbed soil is divided into fine particles and mixed evenly with the solidifying agent, ensuring the uniformity of the pile body. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of a passively driven multidimensional bidirectional stirring drill bit according to this utility model.

[0015] Among them, 1-inner drill rod, 2-outer drill rod, 3-first inner stirring blade, 4-second inner stirring blade, 6-first outer stirring blade, 7-second outer stirring blade, 8-third outer stirring blade, 9-sealing sleeve, 10-moving blade. Detailed Implementation

[0016] Example

[0017] like Figure 1 As shown, a passively driven multidimensional bidirectional stirring drill bit includes an inner drill rod 1, an outer drill rod 2, an inner stirring system, and an outer stirring system. The lower end of the outer drill rod 2 is connected to the inner drill rod 1 through a sealing sleeve 9.

[0018] The external stirring system includes a first external stirring blade 6, a second external stirring blade 7, and a third external stirring blade 8. The first external stirring blade 6, the second external stirring blade 7, and the third external stirring blade 8 are connected to a vertical connecting structure to form a frame structure. The upper end of the frame structure is connected to the outer drill rod 2 by welding or bolting, and the lower end of the frame structure is rotatably connected to the inner drill rod 1. The third external stirring blade 8 includes a first horizontal shaft, a first rotating sleeve, and an external crushing blade. The external crushing blade is connected to the first rotating sleeve, and the first rotating sleeve rotates around the central axis of the first horizontal shaft. A transverse connecting rod is provided between the two layers of blades on the side of the external crushing blade closest to the outer drill rod 2.

[0019] The inner drill rod 1 drives the inner stirring system, and the two are connected by welding or bolts. The inner stirring system includes a first inner stirring blade 3, a second inner stirring blade 4, and a deflecting blade 10. The first inner stirring blade 3, the second inner stirring blade 4, and the deflecting blade 10 are all connected to the inner drill rod 1 by welding or bolts. The distance between the outer crushing blade closest to the outer drill rod 2 and the inner drill rod 1 is L. The length of the deflecting blade 10 is greater than L.

[0020] The inner drill rod 1 rotates, causing the first inner stirring blade 3, the second inner stirring blade 4, and the agitator blade 10 to rotate around the central axis of the inner drill rod 1. The outer drill rod 2 rotates, causing the first outer stirring blade 6, the second outer stirring blade 7, and the third outer stirring blade 8 to rotate around the central axis of the inner drill rod 1. At the same time, the agitator blade 10 causes the third outer stirring blade 8 to rotate around the first horizontal axis.

[0021] Preferably, the second inner stirring blade 4 is composed of 1-3 layers of blades, the second outer stirring blade 7 is composed of 1-3 layers of blades, and the second inner stirring blade 4 and the second outer stirring blade 7 have the same number of blade layers.

[0022] Preferably, the outer breaking blades consist of 2-6 layers, each layer consisting of 2-8 blades, with the blades evenly arranged.

[0023] Preferably, the material strength of the two layers of blades on the side closest to the outer drill rod 2 in the agitator blade 10 and the outer crusher blade is higher than that of the other blades. Example

[0024] like Figure 1 As shown, the construction principle of this mixing drill bit is as follows: Horizontal forced mixing is achieved by setting the first inner mixing blade 3, the second inner mixing blade 4, the first outer mixing blade 6, and the second outer mixing blade 7, cutting the undisturbed soil into sheet-like structures. Vertical forced mixing is achieved by setting the third outer mixing blade 8, further cutting the sheet-like structures into strip-like structures. Through forced mixing in two dimensions, the undisturbed soil is cut uniformly. Theoretically, the soil is cut into strip-like structures, but due to the low viscosity of the soil and repeated multi-layer cutting, the entire undisturbed soil is divided into fine particles and mixed uniformly with the curing agent, ensuring the uniformity of the pile body.

[0025] The inner drill rod 1 rotates, causing the first inner stirring blade 3, the second inner stirring blade 4, and the agitator blade 10 to rotate around the central axis of the inner drill rod 1. The outer drill rod 2 rotates, causing the first outer stirring blade 6, the second outer stirring blade 7, the third outer stirring blade 8, and the third inner stirring blade to rotate around the central axis of the inner drill rod 1. At the same time, the agitator blade 10 causes the third outer stirring blade 8 to rotate around the first transverse axis.

[0026] In the description of the embodiments of this utility model, it should be understood that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and 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. In the description of this utility model, it should be noted that unless otherwise explicitly specified and limited, the terms "set" and "connected" should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral connection; it can refer to a direct connection or an indirect connection through an intermediate medium; it can refer to the internal communication of two elements. Those skilled in the art can understand the specific meaning of the above terms in this utility model through specific circumstances.

[0027] Of course, the above description is not intended to limit the present utility model, and the present utility model is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present utility model are also within the protection scope of the present utility model.

Claims

1. A passive, multi-dimensional, bi-directional, mixing drill bit, comprising: It includes an inner drill rod, an outer drill rod, an inner mixing system, and an outer mixing system. The lower end of the outer drill rod is connected to the inner drill rod through a sealing sleeve. The external stirring system includes a first external stirring blade, a second external stirring blade, and a third external stirring blade. The first external stirring blade, the second external stirring blade, and the third external stirring blade are connected to a vertical connecting structure to form a frame structure. The upper end of the frame structure is connected to the outer drill rod by welding or bolts, and the lower end of the frame structure is rotatably connected to the inner drill rod. The third external stirring blade includes a first horizontal shaft, a first rotating sleeve, and an external crushing blade. The external crushing blade is connected to the first rotating sleeve. The first rotating sleeve rotates around the central axis of the first horizontal shaft. A transverse connecting rod is provided between the two layers of blades on the side of the external crushing blade closest to the outer drill rod. The inner drill rod drives the inner stirring system, which is welded or bolted together. The inner stirring system includes a first inner stirring blade, a second inner stirring blade, and a deflecting blade. The first inner stirring blade, the second inner stirring blade, and the deflecting blade are all connected to the inner drill rod by welding or bolting. The distance between the outer crushing blade, which is closest to the outer drill rod, and the inner drill rod is L. The length of the deflecting blade is greater than L. The rotation of the inner drill rod causes the first inner stirring blade, the second inner stirring blade, and the agitator blade to rotate around the central axis of the inner drill rod. The rotation of the outer drill rod causes the first outer stirring blade, the second outer stirring blade, and the third outer stirring blade to rotate around the central axis of the inner drill rod. At the same time, the agitator blade causes the third outer stirring blade to rotate around the first transverse axis.

2. A passive, multi-dimensional, bi-directional mixing drill bit according to claim 1, wherein, The second inner stirring blade consists of 1-3 layers of blades, and the second outer stirring blade consists of 1-3 layers of blades, with the second inner stirring blade and the second outer stirring blade having the same number of blade layers.

3. A passive, multi-dimensional, bi-directional mixing drill bit according to claim 1, wherein, The outer breaking blades consist of 2-6 layers, with each layer consisting of 2-8 blades, and the blades are evenly arranged.

4. A passive, multi-dimensional, bi-directional mixing drill bit according to claim 1, wherein, The material strength of the two layers of blades closest to the outer drill pipe in the agitator blade and outer breaker blade is higher than that of the other blades.

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