Spiral bidirectional mutual shearing stirring drill bit

Abstract

A spiral two-way mutual shearing stirring drill bit comprises a drill bit body and a stirring frame coaxially and rotatably installed on the drill bit body, and the upper end of the drill bit body and the upper end of the stirring frame are connected with a power head two-way driving device of a stirring pile drilling machine through an inner drill rod and an outer drill rod respectively. A plurality of layers of first shearing blades located in the stirring frame are arranged on the drill bit body in the axial direction at intervals, each layer of first shearing blades comprises a plurality of first shearing blades arranged in a circumferential array mode, and a plurality of layers of second shearing blades are arranged on the inner wall of the stirring frame in the axial direction of the drill bit body at intervals. Each layer of second shearing blades comprises a plurality of second shearing blades arranged in a circumferential array mode, the first shearing blades and the second shearing blades are arranged in an up-down staggered mode at intervals, and a spiral drilling blade is arranged on the head portion of the lower end of the drill bit body. According to the utility model, the drilling resistance is reduced, the drilling footage is facilitated, the soil stirring is more uniform, the construction efficiency is higher, and the high-efficiency construction requirement of engineering is met.

Description

Technical Field

[0001] The utility model relates to the technical field of engineering machinery, in particular to a spiral bidirectional mutual shearing and stirring drill bit. Background Art

[0002] Cement mixing pile is a method used to reinforce saturated soft clay foundation. It uses cement as a curing agent. A special mixing drill is used to forcefully mix the soft soil and curing agent deep in the foundation. A series of physical and chemical reactions between the curing agent and the soft soil are used to harden the soft soil into a high-quality foundation with integrity, water stability and a certain strength. The reinforcement depth is usually more than 5m, the dry reinforcement depth does not exceed 15m, and the wet reinforcement depth does not exceed 20m. The cement slurry pressed into the soft soil is forcibly mixed with the surrounding soft soil by the rotating mixing blade to form a mud reinforcement body.

[0003] Chinese utility model patent CN202321949186 6 discloses a drill bit assembly applied to a multi-layer mutual shear mixing pile drilling rig, comprising an inner tube and an outer tube that can rotate relatively, a plurality of first stirring wing plates are arranged on the outer wall of the inner tube, a plurality of second stirring wing plates are arranged on the outer tube, each first stirring wing plate and the second stirring wing plate are mutually staggered in the axial direction, a drilling wing plate is arranged on the outer wall of the lower end of the inner tube, and the first stirring wing plate, the second stirring wing plate and the drilling wing plate are all arranged obliquely; a grouting channel is arranged in the inner tube, a first grouting pipe is arranged on the lower end surface of the drilling wing plate, and a second grouting pipe is arranged at the lower end of at least one first stirring wing plate. The drill bit assembly applied to the multi-layer mutual shear mixing pile drilling rig can ensure that the soil is fully stirred and mixed, and the mutual shear effect is better; and through the improvement of the grouting pipe, uniform, quantitative and positioned grouting can be achieved. However, the drill bit assembly of the above patent encounters greater resistance during drilling, which is not conducive to drilling progress. The soil mixing and crushing only occurs when the first mixing wing plate and the second mixing wing plate drill into the soil layer, and the construction efficiency is still low.

[0004] In order to solve the above problems, people have been seeking an ideal technical solution. Summary of the invention

[0005] The purpose of the utility model is to provide a spiral bidirectional mutual shearing mixing drill bit to address the deficiencies of the prior art. The utility model reduces drilling resistance, is beneficial to drilling footage, makes soil mixing more uniform, improves construction efficiency, and meets the needs of efficient engineering construction.

[0006] In order to achieve the above-mentioned purpose, the technical scheme adopted by the utility model is: a spiral bidirectional mutual shearing mixing drill bit, comprising a drill bit body and a mixing frame coaxially rotatably installed on the drill bit body, the upper ends of the drill bit body and the mixing frame are respectively connected to the bidirectional driving device of the power head of the mixing pile drilling rig through inner and outer drill rods, the drill bit body rotates forward, and the mixing frame rotates reversely, and several layers of first shearing blades located in the mixing frame are axially spaced on the drill bit body, each layer of the first shearing blades includes several first shearing blades arranged in a circular array, and several layers of second shearing blades are axially spaced on the inner wall of the mixing frame. Each layer of the second shearing blades includes several second shearing blades arranged in a circular array, and each layer of the first shearing blades and each layer of the second shearing blades are alternately arranged at upper and lower intervals, and the lower end head of the drill bit body is provided with a spiral drilling blade located below the mixing frame and spirally arranged along the axial direction.

[0007] The mixing frame comprises a plurality of C-shaped frames, flanges, bearings and two semi-disc-shaped clamps arranged in a circular array. The C-shaped frame is arranged vertically with its open side facing the drill body. The upper end of the C-shaped frame is fixedly connected to the flange. A shaft sleeve is rotatably mounted on the upper end of the drill body. The shaft sleeve is a pipe sleeve structure with an inner circle and an outer square. An annular groove is circumferentially arranged on the lower middle side of the outer wall of the shaft sleeve. A clamping groove matching the contour of the annular groove of the shaft sleeve is provided on the butt joint side of the two semi-disc-shaped clamps. The two semi-disc-shaped clamps are clamped on the shaft sleeve and correspondingly clamped in the annular groove. A square hole matching the outer contour of the shaft sleeve is provided in the middle of the flange. The flange is sleeved on the shaft sleeve and fixedly connected to the two semi-disc-shaped clamps by bolts. The lower end of the C-shaped frame is fixedly connected to the outer wall of the outer ring of the bearing. The bearing is rotatably mounted on the upper end of the drill body. A plurality of second shearing blades are fixedly connected along the vertical interval on the inner wall of the vertical rod of the C-shaped frame.

[0008] The utility model has substantial characteristics and progress compared with the prior art. Specifically, the utility model improves the drilling blades on the original mixing drill bit into spiral drilling blades arranged along the axial direction, and the spiral drilling blades are arranged at the lower end head of the drill bit body. When the mixing pile drilling rig is under construction, the two-way driving device of the power head of the mixing pile drilling rig drives the drill bit body and the mixing frame to rotate respectively through the inner and outer drill rods, the drill bit body rotates forward, and the mixing frame rotates reversely. Under the action of the spiral drilling blades, the drilling resistance at the lower end head of the drill bit body is reduced, which is beneficial to the drilling footage and can make the drilled and broken soil rise through the spiral surface of the spiral drilling blade. The soil rises to the top of the spiral drilling blade and enters the mixing frame and falls. During the falling process, the soil is sheared by the second shearing blade rotating in the reverse direction and the first shearing blade rotating forwardly, so that the soil mixing is more uniform, the construction efficiency is higher, and the needs of efficient construction of the project are met. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1It is a front view of the utility model.

[0010] Figure 2 yes Figure 1 AA section view in.

[0011] Figure 3 It is an axial view of the utility model.

[0012] In the figure: 1. drill bit body; 2. first shear blade; 3. second shear blade; 4. spiral drilling blade; 5. C-frame; 6. flange; 7. bearing; 8. semi-disc clamp; 9. sleeve. DETAILED DESCRIPTION

[0013] The technical solution of the utility model is further described in detail below through specific implementation methods.

[0014] like Figure 1-3 As shown, a spiral bidirectional mutual shearing mixing drill bit comprises a drill body 1 and a mixing frame coaxially mounted on the drill body 1, the upper ends of the drill body 1 and the mixing frame are respectively connected to the bidirectional driving device of the power head of the mixing pile drilling rig through inner and outer drill rods, the drill body 1 rotates forward, and the mixing frame rotates reversely, a plurality of layers of first shearing blades 2 located in the mixing frame are axially spaced apart on the drill body 1, each layer of the first shearing blades 2 comprises a plurality of first shearing blades 2 arranged in a circular array, a plurality of layers of second shearing blades 3 are axially spaced apart on the inner wall of the mixing frame, each layer of the second shearing blades 3 comprises a plurality of second shearing blades 3 arranged in a circular array, each layer of the first shearing blades 2 and each layer of the second shearing blades 3 are alternately arranged at upper and lower intervals, and a spiral drilling blade 4 located below the mixing frame and spirally arranged along the axial direction is provided at the lower end head of the drill body 1. During the construction of the mixing pile drilling rig, the spiral drilling blade 4 can reduce the drilling resistance, which is beneficial to the drilling footage and can make the drilled and broken soil rise through the spiral surface of the spiral drilling blade 4. The soil rises to the top of the spiral drilling blade 4 and falls into the mixing frame. During the falling process, the soil is sheared by the counter-rotating second shearing blade 3 and the forward rotating first shearing blade 2, so that the soil mixing is more uniform and the construction efficiency is higher, meeting the needs of efficient construction of the project.

[0015] The mixing frame includes three C-shaped frames 5, flanges 6, bearings 7 and two semi-disc-shaped clamps 8 arranged in a circumferential array. The C-shaped frame 5 is arranged vertically and its open side faces the drill body 1. The upper end of the C-shaped frame 5 is fixedly connected to the flange 6. The upper end of the drill body 1 is rotatably mounted with a sleeve 9. The sleeve 9 is a pipe sleeve structure with an inner circle and an outer square. The lower side of the middle of the outer wall of the sleeve 9 is provided with an annular groove along the circumferential direction. The butt joint side of the two semi-disc-shaped clamps 8 is provided with a profile that matches the profile of the annular groove of the sleeve 9. The two semi-disc-shaped clamps 8 are clamped on the shaft sleeve 9 and correspondingly clamped in the annular groove. A square hole matching the outer contour of the shaft sleeve 9 is opened in the middle of the flange 6. The flange 6 is sleeved on the shaft sleeve 9 and fixedly connected with the two semi-disc-shaped clamps 8 by bolts. The lower end of the C-shaped frame 5 is fixedly connected to the outer wall of the outer ring of the bearing 7. The bearing 7 is rotatably mounted on the upper end of the drill body 1. A plurality of second shear blades 3 are fixedly connected to the inner wall of the vertical rod of the C-shaped frame 5 at vertical intervals. The provision of the two semi-disc-shaped clamps 8 is conducive to the disassembly and assembly of the mixing frame, and is convenient for replacement and maintenance.

[0016] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the utility model can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the utility model, which should be included in the scope of the technical solution for protection of the utility model.

Claims

1. A spiral bidirectional mutual shearing mixing drill bit, comprising a drill bit body and a mixing frame coaxially mounted on the drill bit body, the upper ends of the drill bit body and the mixing frame are respectively connected to the bidirectional driving device of the power head of the mixing pile drilling rig through the inner and outer drill rods, the drill bit body rotates forward, and the mixing frame rotates reversely, a plurality of layers of first shearing blades located in the mixing frame are arranged at intervals along the axial direction on the drill bit body, each layer of the first shearing blades includes a plurality of first shearing blades arranged in a circumferential array, a plurality of layers of second shearing blades are arranged at intervals along the axial direction on the inner wall of the mixing frame, each layer of the second shearing blades includes a plurality of second shearing blades arranged in a circumferential array, each layer of the first shearing blades and each layer of the second shearing blades are arranged alternately at intervals up and down, and a spiral drilling blade located below the mixing frame and arranged in an axial spiral manner is arranged at the lower end of the drill bit body, characterized in that: The mixing frame comprises a plurality of C-shaped frames, flanges, bearings and two semi-disc-shaped clamps arranged in a circular array. The C-shaped frame is arranged vertically with its open side facing the drill body. The upper end of the C-shaped frame is fixedly connected to the flange. A shaft sleeve is rotatably mounted on the upper end of the drill body. The shaft sleeve is a pipe sleeve structure with an inner circle and an outer square. An annular groove is circumferentially arranged on the lower middle side of the outer wall of the shaft sleeve. A clamping groove matching the contour of the annular groove of the shaft sleeve is provided on the butt joint side of the two semi-disc-shaped clamps. The two semi-disc-shaped clamps are clamped on the shaft sleeve and correspondingly clamped in the annular groove. A square hole matching the outer contour of the shaft sleeve is provided in the middle of the flange. The flange is sleeved on the shaft sleeve and fixedly connected to the two semi-disc-shaped clamps by bolts. The lower end of the C-shaped frame is fixedly connected to the outer wall of the outer ring of the bearing. The bearing is rotatably mounted on the upper end of the drill body. A plurality of second shearing blades are fixedly connected along the vertical interval on the inner wall of the vertical rod of the C-shaped frame.

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