Double-shaft stirring device for stirring pile construction

Abstract

The invention discloses a double-shaft stirring device for stirring pile construction, which comprises a walking machine body, a stand column hinged on the walking machine body, a hydraulic push rod respectively hinged with the stand column and the walking machine body, a sliding frame and a rotary stirring mechanism, the rotary stirring mechanism comprises a drilling frame, a stirring main shaft, a stirring auxiliary shaft and a driving assembly, the stirring main shaft and the driving assembly are both connected with the sliding frame, the drilling frame is arranged on the stirring main shaft in a sleeving mode, and first drilling blades are arranged on the outer side of the drilling frame; a driving bevel gear is arranged on the driving assembly and meshed with a first bevel gear on the stirring main shaft and a second bevel gear on the drilling frame, the stirring auxiliary shaft is installed in the drilling frame and is in transmission connection with the stirring main shaft, a slurry spraying opening is formed in the stirring main shaft, and first stirring blades are arranged on the stirring auxiliary shaft in a staggered mode. The stirring device is uniform in stirring and good in effect.

Description

Technical Field

[0001] The invention belongs to the technical field of mixing pile equipment, and in particular relates to a double-shaft mixing device for mixing pile construction. Background Art

[0002] A mixing pile is a columnar reinforcement formed by solidifying a mixture of cement slurry and other materials with the original soil after the soil is treated through deep mixing. It has good integrity, compressive strength, and water stability, and is widely used in engineering fields such as soft foundation reinforcement, anti-liquefaction treatment, slope support, and contaminated soil remediation. Its basic principle is to use a rotating mixing device to fully mix cement, sand, stone, or other solidifying materials with the foundation soil, and inject slurry through a grouting system. After mixing, infiltration, and solidification, the pile body is formed, thereby improving the bearing capacity and stability of the foundation. Mixing piles can be applied to a variety of complex geological conditions, including but not limited to sandy foundations, silt foundations, silt foundations, water-sand foundations, karst foundations, and soft clay foundations. Its application areas are wide, including building foundations, roads, dams, as well as offshore engineering, mining construction, and other engineering fields.

[0003] However, most traditional mixing pile construction equipment adopts a single-axis structure with a limited mixing range, making it difficult to achieve sufficient mixing of soil and slurry. Especially in high-viscosity and high-water content strata, problems such as uneven mixing and insufficient pile strength often occur, making it difficult to meet the construction requirements of high-quality pile forming.

[0004] To improve mixing efficiency and pile uniformity, dual-axis mixing devices have gradually emerged. These devices use two parallel mixing shafts to perform counter-rotating mixing, effectively expanding the mixing range and enhancing the mixing effect. However, dual-axis mixing devices still have certain limitations: on the one hand, mechanical interference between the two mixing shafts leads to a mixing blind zone in the intersection area, making it difficult to form effective shearing and flipping, resulting in uneven lateral strength of the pile body and affecting the uniformity and continuity of the pile body; on the other hand, existing dual-axis mixing devices mostly rely on independent drive systems, and the speed matching accuracy of the two shafts is insufficient, which easily leads to torque differences in complex strata. This not only reduces mixing efficiency and effect, but also causes the pile axis to deviate, thereby affecting the verticality and structural integrity of the pile, restricting its promotion and application in high-standard construction scenarios.

[0005] Therefore, we propose a double-shaft mixing device for mixing pile construction to solve the above technical problems. Summary of the Invention

[0006] In order to solve the technical problems existing in the above-mentioned prior art, the present invention proposes a double-shaft stirring device for mixing pile construction.

[0007] The technical solution adopted in the present invention is as follows: A double-shaft mixing device for mixing pile construction, comprising a walking body, a column, a hydraulic push rod, a sliding frame and a rotating mixing mechanism, wherein one end of the column is hingedly mounted on the walking body, one end of the hydraulic push rod is hingedly connected to the middle of the column, and the other end is hinged to the walking body, the sliding frame is mounted on the column and can slide along the axial direction of the column, a winch is installed on the winch, a steel wire rope is wound around the winch, an intermediate guide wheel is provided on the top of the column, a reversing guide wheel is provided on the top of the sliding frame, one end of the steel wire rope passes around the intermediate guide wheel and the reversing guide wheel in turn, and is fixedly connected to the column, the rotating mixing mechanism comprises a drilling frame, a mixing main shaft, a mixing sub-shaft and a driving assembly, the mixing main shaft is rotatably mounted Below the sliding frame, the drilling frame is a hollow rectangular structure, the drilling frame is movably mounted on the stirring main shaft, the stirring main shaft is fixedly sleeved with a first bevel gear, the drilling frame is fixedly provided with a second bevel gear, the driving assembly is installed below the sliding frame, the driving assembly is transmission-connected with an active bevel gear, the first bevel gear and the second bevel gear are both meshed with the active bevel gear, the stirring sub-shaft is rotatably mounted in the drilling frame, and is transmission-connected with the stirring main shaft through a synchronous gear, the stirring main shaft is provided with a plurality of grouting ports connected to the slurry delivery pipe, a plurality of first stirring blades are staggered on the outer sides of the stirring main shaft and the stirring sub-shaft, and a first drilling blade is provided on the outer side of the drilling frame.

[0008] In a further technical solution, the drive assembly includes a servo motor and a gear reduction box. A fixed plate is connected to the bottom of the sliding frame through a fixed rod. The servo motor and the gear reduction box are both fixedly mounted on the fixed plate. The servo motor and the gear reduction box are transmission-connected, and the active bevel gear is sleeved on the output shaft of the gear reduction box.

[0009] In a further technical solution, a plurality of second stirring blades staggered with the first stirring blades are further provided on the inner side of the drilling frame.

[0010] In a further technical solution, auxiliary frames are coaxially arranged on both sides of the drilling frame, and second drilling blades are provided on the outer sides of the auxiliary frames.

[0011] In a further technical solution, a drilling head is further included, wherein a spiral blade is provided on the outer side of the drilling head, and the top surface of the drilling head is fixedly connected to the drilling frame and the auxiliary frame.

[0012] In a further technical solution, a transition guide wheel is further provided on the column, and the wire rope is connected to the column after passing through the transition guide wheel, the intermediate guide wheel and the reversing guide wheel in sequence.

[0013] In a further technical solution, the installation angle of the first stirring blades on the stirring main shaft and the stirring sub-shaft is 15 degrees to 30 degrees.

[0014] In a further technical solution, the stirring main shaft and the stirring secondary shaft are fixedly connected to the drilling frame through bearings.

[0015] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: 1. The mixing sub-shaft of the present invention is installed on the drilling frame. As the drilling frame rotates, the spatial position of the mixing sub-shaft changes continuously, so that the position of the junction area between the mixing main shaft and the mixing sub-shaft changes dynamically, so that the mixing range dynamically covers the blind area, improves the mixing uniformity of the slurry and the soil, and helps to improve the uniformity and continuity of the pile body forming.

[0016] 2. This invention utilizes a single power source to link dual shafts and the drilling frame, reducing the complexity of synchronous control and effectively preventing deformation or distortion of the mixing pile caused by dual shaft speed deviation. Furthermore, the use of dual shaft staggered mixing and dynamic interleaved mixing significantly improves mixing efficiency and slurry distribution uniformity, ensuring that the verticality and structural integrity of the pile meet high-standard construction requirements, facilitating its widespread application in high-standard construction scenarios.

[0017] 3. The present invention further improves drilling efficiency and ground-breaking ability through the arrangement of the auxiliary frame and the drilling head, which can effectively shorten the construction period and meet the needs of efficient pile formation under complex geological conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will now be described by way of example with reference to the accompanying drawings, in which: Figure 1 It is a structural schematic diagram of the present invention; Figure 2 for Figure 1 A partial enlarged schematic diagram of point A in the middle; Figure 3 Schematic diagram of the structure of a drilling frame in one embodiment of the present invention.

[0019] Figure markings: 1-walking body, 2-column, 3-hydraulic push rod, 4-sliding frame, 5-winch, 6-wire rope, 7-intermediate guide wheel, 8-reversing guide wheel, 9-drilling frame, 10-mixing main shaft, 11-mixing secondary shaft, 12-first bevel gear, 13-second bevel gear, 14-driving bevel gear, 15-synchronizing gear, 16-spraying port, 17-first mixing blade, 18-first drilling blade, 19-servo motor, 20-gear reduction box, 21-fixed rod, 22-fixed plate, 23-second mixing blade, 24-auxiliary frame, 25-second drilling blade, 26-drilling head, 27-spiral blade, 28-transition guide wheel. DETAILED DESCRIPTION

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0021] See Figure 1-Figure 3 The present invention provides a double-shaft mixing device for mixing pile construction, comprising a walking body 1, a column 2, a hydraulic push rod 3, a sliding frame 4 and a rotating mixing mechanism. One end of the column 2 is hingedly mounted on the walking body 1, one end of the hydraulic push rod 3 is hingedly connected to the middle of the column 2, and the other end is hingedly connected to the walking body 1. The sliding frame 4 is mounted on the column 2 and can slide axially along the column 2. A winch 5 is installed on the winch 5. A steel wire rope 6 is wound around the winch 5. An intermediate guide wheel 7 is provided at the top of the column 2, and a reversing guide wheel 8 is provided at the top of the sliding frame 4. One end of the steel wire rope 6 passes around the intermediate guide wheel 7 and the reversing guide wheel 8 in turn and is fixedly connected to the column 2. The rotating mixing mechanism comprises a drilling frame 9, a mixing main shaft 10, a mixing sub-shaft 11 and a driving assembly. The mixing main shaft 10 is rotatably mounted on the sliding frame Below the movable frame 4, the drilling frame 9 is a hollow rectangular structure, and the drilling frame 9 is movably mounted on the stirring main shaft 10. The stirring main shaft 10 is fixedly sleeved with a first bevel gear 12, and the drilling frame 9 is fixedly provided with a second bevel gear 13. The driving assembly is installed below the sliding frame 4, and the driving assembly is transmission-connected with an active bevel gear 14. The first bevel gear 12 and the second bevel gear 13 are both engaged with the active bevel gear 14. The stirring sub-shaft 11 is rotatably mounted in the drilling frame 9 and is transmission-connected with the stirring main shaft 10 through a synchronous gear 15. A plurality of grouting ports 16 connected to the slurry pipe are provided on the stirring main shaft 10. A plurality of first stirring blades 17 are staggered on the outer sides of the stirring main shaft 10 and the stirring sub-shaft 11, and a first drilling blade 18 is provided on the outer side of the drilling frame 9.

[0022] The specific working principle of this dual-axis mixing device during the construction of mixing piles is as follows: The traveling frame 1 serves as the foundational support and mobile platform for the entire device, carrying and transporting the equipment. Its excellent maneuverability facilitates efficient movement and deployment between multiple construction areas, enabling continuous pile construction at multiple locations. The columns 2, serving as the guide and support structure for the sliding frame 4, are hingedly mounted on the traveling frame 1. Their position can be adjusted by telescoping hydraulic push rods 3, thereby varying the inclination of the columns 2 and enabling flexible adjustment of the soil penetration angle of the rotary mixing mechanism to accommodate varying terrain and inclination requirements. The sliding frame 4 is mounted on the columns 2 and can slide axially. The winch 5, intermediate guide pulley 7, reversing guide pulley 8, and wire rope 6 coordinate the movement of the sliding frame 4 along the columns 2, thereby driving the rotary mixing mechanism and achieving precise control of the drilling depth, ensuring controllable pile formation depth. As the core functional component for soil drilling, slurry injection, and soil mixing, the rotary mixing mechanism determines the quality and uniformity of the pile formation. Its structure mainly includes: a stirring main shaft 10, which can be rotatably installed under the sliding frame 4. The stirring main shaft 10 is provided with multiple stirring blades and multiple spraying ports 16 connected to the slurry pipe. During the rotation of the stirring main shaft 10, the slurry can be sprayed while stirring, so that the slurry and the soil are mixed under the shearing effect; the drilling frame 9 is a hollow rectangular structure, which is movably mounted on the stirring main shaft 10 and can rotate around the main shaft. At the same time, it supports the installation of the stirring sub-shaft 11, and the first drilling blade 18 on its outer side is used for drilling and providing cutting force; the stirring sub-shaft 11 can be rotatably installed inside the drilling frame 9. It is provided with multiple stirring blades, which are staggered with the stirring blades on the stirring main shaft 10 to form a spatial staggered structure. It is connected to the stirring main shaft 10 through a synchronous gear 15. The synchronous gear 15 refers to a pair of meshing gears, which are respectively installed on the stirring main shaft 10 and the stirring sub-shaft 11. The rigid transmission is used to force the stirring main shaft 10 and the stirring sub-shaft 11 to keep synchronous reverse rotation to enhance the mixing effect; the driving assembly, as a power output mechanism, is provided with an active bevel gear 14 on the driving assembly, which is meshed with the first bevel gear 12 on the stirring main shaft 10 and the second bevel gear 13 on the drilling frame 9. After the driving assembly is started, the active bevel gear 14 simultaneously drives the first bevel gear 12 and the second bevel gear 13, so that the stirring main shaft 10 and the drilling frame 9 rotate in opposite directions, thereby realizing rotary cutting and stirring operations. It is worth mentioning that since the mixing sub-shaft 11 is mounted on the drilling frame 9, the spatial position of the mixing sub-shaft 11 changes continuously as the drilling frame 9 rotates, causing the position of the interface between the mixing main shaft 10 and the mixing sub-shaft 11 to change dynamically, allowing the mixing range to dynamically cover blind spots, improving the uniformity of the slurry and soil mixing, and contributing to improved uniformity and continuity in pile forming. Compared to traditional dual-shaft mixing devices, this solution reduces the complexity of synchronous control by linking the dual shafts and the drilling frame 9 through a single power source, effectively avoiding deformation or distortion of the mixing pile caused by dual-shaft speed deviations.At the same time, the use of dual-axis staggered mixing and dynamic staggered mixing methods has greatly improved the mixing efficiency and slurry distribution uniformity, ensuring that the verticality of the pile and the structural integrity meet high-standard construction requirements, which is conducive to promotion and application in high-standard construction scenarios.

[0023] In a specific embodiment, see Figure 2 The driving assembly includes a servo motor 19 and a gear reduction box 20. A fixed plate 22 is connected to the bottom of the sliding frame 4 through a fixed rod 21. The servo motor 19 and the gear reduction box 20 are fixedly mounted on the fixed plate 22. The servo motor 19 and the gear reduction box 20 are transmission-connected. The active bevel gear 14 is sleeved on the output shaft of the gear reduction box 20.

[0024] The drive assembly is installed under the sliding frame 4 through the fixing rod 21 and the fixing plate 22. The drive assembly cooperates with the servo motor 19 and the gear reduction box 20 to convert the high-speed and low-torque power output by the servo motor 19 into low-speed and high-torque power through the gear reduction box 20, ensuring that the active bevel gear 14 drives the first bevel gear 12 and the second bevel gear 13 to rotate, realizing the synchronous reverse rotation of the stirring spindle 10 and the drilling frame 9, and realizing rotary cutting and stirring operations.

[0025] In a specific embodiment, see Figure 2 The inner side of the drilling frame 9 is further provided with a plurality of second stirring blades 23 staggered with the first stirring blades 17 .

[0026] By arranging a second stirring blade 23 staggered with the first stirring blade 17 on the inner side of the drilling frame 9, the shear force and disturbance range during the stirring process are further enhanced, thereby significantly improving the overall stirring intensity and mixing uniformity, and effectively improving the density and molding quality of the pile body.

[0027] In a specific embodiment, see Figure 3 Auxiliary frames 24 are coaxially arranged on both sides of the drilling frame 9, and second drilling blades 25 are arranged on the outer sides of the auxiliary frames 24.

[0028] By adding an auxiliary frame 24 and arranging a second drilling blade 25 on the outside of the auxiliary frame 24, a multi-point collaborative cutting structure is formed, which can increase the overall drilling frequency during the drilling process, thereby significantly improving the drilling efficiency and ground-breaking ability, shortening the construction period, and adapting to the demand for efficient pile formation under complex geological conditions.

[0029] In a specific embodiment, see Figure 3 , further comprising a drilling head 26 , the outer side of which is provided with a spiral blade 27 , and the top surface of the drilling head 26 is fixedly connected to both the drilling frame 9 and the auxiliary frame 24 .

[0030] By adding a drilling head 26 to the lower end of the drilling frame 9 and the auxiliary frame 24, and setting a spiral blade 27 on its outer side, a stable spiral propulsion and cutting action is formed during the drilling process, which can effectively improve the ground breaking ability and drilling speed, and further improve the overall drilling efficiency.

[0031] In a specific embodiment, see Figure 1 The column 2 is also provided with a transition guide wheel 28, and the wire rope 6 is connected to the column 2 after passing through the transition guide wheel 28, the intermediate guide wheel 7 and the reversing guide wheel 8 in sequence.

[0032] The transition guide wheel 28 refers to a pulley structure arranged at intervals in the axial direction of the column 2. The number of pulleys is arranged according to the length of the column 2, forming multiple support points on the column 2, which helps to disperse the concentrated load of the wire rope 6 during operation, reduce the risk of wear and breakage caused by single-point force, and thus significantly improve the stability and service life of the traction system.

[0033] In a specific embodiment, the installation angle of the first stirring blades 17 on the stirring main shaft 10 and the stirring secondary shaft 11 is 15 degrees to 30 degrees.

[0034] The installation angle of 15 to 30 degrees enables the first mixing blade 17 to generate sufficient lateral shear force to crush the soil while avoiding excessive axial thrust that causes local accumulation of slurry, effectively ensuring the mixing efficiency of slurry and soil, improving the uniformity and density of the pile, and ensuring stable and reliable construction quality.

[0035] In a specific embodiment, the stirring main shaft 10 and the stirring secondary shaft 11 are both fixedly connected to the drilling frame 9 via bearings.

[0036] The rotational support characteristics of the bearings reduce the friction between the main stirring shaft 10 and the auxiliary stirring shaft 11 and the drilling frame 9, ensuring stable rotation, reducing vibration, improving the stability of the entire machine, and guaranteeing mixing uniformity and pile forming quality.

[0037] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A double-shaft mixing device for mixing pile construction, characterized in that: The invention comprises a walking machine body (1), a column (2), a hydraulic push rod (3), a sliding frame (4) and a rotating stirring mechanism, wherein one end of the column (2) is hingedly mounted on the walking machine body (1), one end of the hydraulic push rod (3) is hingedly mounted on the middle part of the column (2), and the other end is hingedly mounted on the walking machine body (1), the sliding frame (4) is mounted on the column (2) and can slide along the axial direction of the column (2), a winch (5) is mounted on the walking machine body (1), and the winch (5) is hingedly mounted on the walking machine body (1). A steel wire rope (6) is wound around the column (2), an intermediate guide wheel (7) is provided on the top of the slide frame (4), and a reversing guide wheel (8) is provided on the top of the slide frame (4). One end of the steel wire rope (6) passes through the intermediate guide wheel (7) and the reversing guide wheel (8) in sequence and is fixedly connected to the column (2). The rotary stirring mechanism comprises a drilling frame (9), a stirring main shaft (10), a stirring secondary shaft (11) and a driving assembly. The stirring main shaft (10) is rotatably mounted below the slide frame (4). The drilling frame (9) is a hollow rectangular structure. The drilling frame (9) is movably sleeved on the stirring main shaft (10). A first bevel gear (12) is fixedly sleeved on the stirring main shaft (10). A second bevel gear (13) is fixedly provided on the drilling frame (9). The driving assembly is mounted below the slide frame (4). The driving assembly is transmission-connected to an active bevel gear (14). The first bevel gear (12) and the second bevel gear (13) are both connected to the The driving bevel gear (14) is meshed with each other, the stirring sub-shaft (11) is rotatably installed in the drilling frame (9), and is connected to the stirring main shaft (10) through a synchronous gear (15). The stirring main shaft (10) is provided with a plurality of spraying ports (16) connected to the slurry delivery pipe. A plurality of first stirring blades (17) are staggered on the outer sides of the stirring main shaft (10) and the stirring sub-shaft (11), and a first drilling blade (18) is provided on the outer side of the drilling frame (9).

2. A biaxial stirring device for mixing pile construction according to claim 1, characterized in that: The driving assembly includes a servo motor (19) and a gear reduction box (20). A fixed plate (22) is connected to the bottom of the sliding frame (4) via a fixed rod (21). The servo motor (19) and the gear reduction box (20) are both fixedly mounted on the fixed plate (22). The servo motor (19) and the gear reduction box (20) are in transmission connection. The active bevel gear (14) is sleeved on the output shaft of the gear reduction box (20).

3. A biaxial stirring device for pile construction according to claim 1, characterized in that: A plurality of second stirring blades (23) are also provided on the inner side of the drilling frame (9) and are arranged staggered with the first stirring blades (17).

4. A biaxial stirring device for use in mixing pile construction according to any one of claims 1 to 3, characterized in that: Auxiliary frames (24) are coaxially arranged on both sides of the drilling frame (9), and second drilling blades (25) are arranged on the outer sides of the auxiliary frames (24).

5. A biaxial stirring device for construction of mixing piles according to claim 4, characterized in that: It also includes a drilling head (26), the outer side of which is provided with a spiral blade (27), and the top surface of the drilling head (26) is fixedly connected to both the drilling frame (9) and the auxiliary frame (24).

6. A biaxial stirring device for construction of mixing piles according to claim 1, characterized in that: The column (2) is also provided with a transition guide wheel (28), and the steel wire rope (6) is connected to the column (2) after passing through the transition guide wheel (28), the intermediate guide wheel (7) and the reversing guide wheel (8) in sequence.

7. A biaxial stirring device for construction of mixing piles according to claim 1, characterized in that: The installation angle of the first stirring blade (17) on the stirring main shaft (10) and the stirring secondary shaft (11) is 15 degrees to 30 degrees.

8. A biaxial stirring device for construction of mixing piles according to claim 1, characterized in that: The stirring main shaft (10) and the stirring secondary shaft (11) are both fixedly connected to the drilling frame (9) via bearings.

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