A double-shaft mixing device for fluidized solidified soil

Abstract

The utility model relates to a kind of double-shaft stirring device for fluidized solidified soil, comprising: stirring barrel body;Two stirring driving devices are set in stirring barrel body top;First stirring shaft and second stirring shaft are vertically arranged in stirring barrel body inside, and its top end is respectively connected with two stirring driving devices, rotation is controlled by stirring driving device, and the rotation direction of first stirring shaft and second stirring shaft is same. Among them, a plurality of first stirring blades are sequentially and spaced apart on the first stirring shaft, a plurality of second stirring blades are sequentially and spaced apart on the second stirring shaft, each first stirring blade and each second stirring blade are staggered in two shaft axial direction;The blade of first stirring blade and second stirring blade is inclined to set relative to horizontal plane, and the inclination direction relative to horizontal plane is opposite.The double-shaft stirring device for fluidized solidified soil provided by the utility model has high stirring intensity, can make the fluidized solidified soil slurry stirred by it uniform and stable, and meet construction requirement.

Description

Technical Field

[0001] This utility model relates to the technical field of construction devices for fluidized solidified soil, and in particular to a twin-shaft mixing device for fluidized solidified soil. Background Technology

[0002] Fluidized solidified soil is a new type of building material widely used in road construction, railway construction, subway construction, and other fields for backfilling cavities, trenches, and roadbeds. Fluidized solidified soil is a mixture of native soil, solidifying agent, and water in a specific ratio to achieve a certain fluidity. Since the native soil used for backfilling is often waste soil discarded on-site or at other construction sites, the preparation of fluidized solidified soil has significant social implications, such as reducing waste soil accumulation and lowering backfilling costs. Mixing is a crucial step in the preparation of fluidized solidified soil. However, the sources of native soil are diverse, with commonly used silty soil and clay exhibiting strong viscosity, which places certain demands on the mixing equipment. Most existing mixing equipment uses a single-shaft mixer to mix the raw materials. Its mixing structure is relatively simple, making it difficult to mix the native soil evenly and thoroughly. It also suffers from low mixing efficiency, resulting in the produced fluidized solidified soil failing to meet construction requirements in terms of uniformity and stability.

[0003] Based on the above, this utility model proposes a twin-shaft mixing device for fluidized solidified soil, which can effectively improve the problems existing in the prior art. Utility Model Content

[0004] The purpose of this invention is to provide a biaxial mixing device for fluidized solidified soil, so as to solve the problem of difficulty in mixing evenly and fully during the preparation of fluidized solidified soil.

[0005] To achieve the above objectives, this utility model provides a biaxial mixing device for fluidized solidified soil, comprising: a mixing cylinder; two mixing drive devices disposed at the top of the mixing cylinder; a first mixing shaft and a second mixing shaft vertically disposed inside the mixing cylinder, the top ends of which are respectively connected to the two mixing drive devices and rotated by the mixing drive devices, and the bottom ends of which are disposed at a certain distance from the bottom of the mixing cylinder, and the first mixing shaft and the second mixing shaft rotate in the same direction.

[0006] Multiple first stirring blades are arranged at intervals on the first stirring shaft, and multiple second stirring blades are arranged at intervals on the second stirring shaft. The first stirring blades on the first stirring shaft and the second stirring blades on the second stirring shaft are arranged alternately in the two shafts. The blades of the first stirring blades and the second stirring blades are both inclined relative to the horizontal plane, and the inclination directions of the blades of the first stirring blades and the second stirring blades relative to the horizontal plane are opposite.

[0007] Furthermore, the line connecting the axes of the first and second stirring shafts passes through the axis of the stirring cylinder, and the distance between the axes of the first and second stirring shafts is equal to the sum of the outer diameters of the first and second stirring blades.

[0008] Furthermore, the first and second stirring blades have the same structure, shape, and size, and the distance between the ends of the first and second stirring blades and the inner wall of the stirring cylinder is not less than 5 cm and not more than 10 cm.

[0009] The second stirring shaft is also provided with a plurality of stirring rods, which are arranged perpendicular to the second stirring shaft and are arranged alternately with the second stirring blade on the second stirring shaft. The outer diameter of the stirring rod does not exceed the outer diameter of the second stirring blade.

[0010] Furthermore, the stirring rod is equipped with a first metal burr.

[0011] The two stirring drive devices respectively adjust the rotation speed of the first stirring shaft and the second stirring shaft. The rotation speed of the first stirring shaft and the second stirring shaft is the same, both ranging from 0 to 500 rpm.

[0012] The second stirring shaft is shorter than the first stirring shaft. A filter screen is provided directly below the second stirring shaft and is connected to the inner wall of the stirring cylinder. The filter screen is inclined downwards, and the distance between the connection point of the filter screen and the inner wall of the stirring cylinder and the bottom of the stirring cylinder is 40-60 cm.

[0013] Multiple soil-breaking rods are installed on the inner wall of the mixing cylinder. The soil-breaking rods are located on both sides of the inner wall of the mixing cylinder in the middle area between the first mixing shaft and the second mixing shaft, and are arranged in a matrix. All soil-breaking rods are of equal length and do not exceed the distance from the end of the first mixing blade and the second mixing blade to the inner wall of the mixing cylinder. The soil-breaking rods are also equipped with second metal burrs.

[0014] The upper end of the mixing cylinder is open and has a cover plate. The cover plate has a feed inlet. Both of the two mixing drive devices are mounted on the cover plate. The feed inlet is located on one side of the line connecting the two mixing drive devices. The bottom side of the mixing cylinder has a discharge outlet.

[0015] Furthermore, an inclined baffle is provided directly below the feed inlet, connected to the inner wall of the mixing cylinder, and the inclined baffle is inclined downward.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. By setting up a dual-shaft structure, the fluidized solidified soil is fully mixed. Utilizing the same rotation direction of the two shafts, the fluidized solidified soil slurry generates a strong shearing effect at the interface between the two shafts due to the different flow directions, which accelerates dispersion. At the same time, relying on the opposite inclination direction of the mixing blades on the two mixing shafts relative to the horizontal plane, a downward and an upward thrust is generated during mixing, realizing the formation of an up-and-down circulating slurry flow in the mixer, which promotes dispersion.

[0018] 2. By alternating layers of mixing blades and mixing rods on the second mixing shaft, the soil lumps in the fluidized solidified soil slurry are broken into secondary fragments by impacting the mixing rods under the push of the blades. This is beneficial for dispersing highly viscous soil lumps. Adding metal burrs is even more beneficial for dispersing highly viscous silty soil.

[0019] 3. By installing a filter screen below the second stirring shaft, the mud is further dispersed when it passes through the filter screen under the action of stirring. Large particles in the mud that are not dispersed will be dispersed by compression and shearing between the filter screen and the stirring shaft.

[0020] 4. By installing soil-breaking rods with metal burrs on the inner wall of the mixing drum from top to bottom, the soil clods thrown onto the inner wall of the mixing drum under centrifugal force are broken up. At the same time, large particles in the fluidized solidified soil slurry are more likely to break up when they collide with the metal burrs.

[0021] In summary, the dual-shaft mixing device provided by this utility model has high mixing intensity, which can make the fluidized solidified soil slurry it mixes uniform and stable, meeting the construction requirements. Attached Figure Description

[0022] Figure 1 This is a front view of a twin-shaft mixing device for fluidized solidified soil according to the present invention;

[0023] Figure 2 This is a top view of a twin-shaft mixing device for fluidized solidified soil according to the present invention;

[0024] Figure 3 This is a front sectional view of a twin-shaft mixing device for fluidized solidified soil according to the present invention;

[0025] Figure 4 This is a side sectional view of a twin-shaft mixing device for fluidized solidified soil according to the present invention;

[0026] Figure 5 This is a schematic diagram of the stirring rod of a dual-shaft mixing device for fluidized solidified soil according to the present invention;

[0027] Figure 6 This is a schematic diagram of the mixing blades of a twin-shaft mixing device for fluidized solidified soil according to the present invention;

[0028] Figure 7 This is a schematic diagram of the filter screen of a twin-shaft mixing device for fluidized solidified soil according to the present invention. Detailed Implementation

[0029] The following will be combined with the appendix in the embodiments of this utility model. Figure 1 ~Appendix Figure 7 The technical solutions, structural features, objectives and effects achieved in the embodiments of this utility model are described in detail.

[0030] It should be noted that the accompanying drawings are in a very simplified form and use non-precise proportions. They are only used to facilitate and clarify the illustration of the embodiments of this utility model, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportional relationship, or adjustments to the size should still fall within the scope of the technical content disclosed in this utility model, provided that they do not affect the effects and objectives that this utility model can produce.

[0031] It should be noted that in this invention, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only the expressly listed elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.

[0032] This utility model provides a twin-shaft mixing device for fluidized solidified soil, such as... Figures 1-4 As shown, the stirring device includes: a stirring cylinder 1; two stirring drive devices 2, which are located at the top of the stirring cylinder 1; stirring shafts 5, including a first stirring shaft 51 and a second stirring shaft 52, which are vertically arranged inside the stirring cylinder 1. The top ends of the first stirring shaft 51 and the second stirring shaft 52 are respectively connected to the two stirring drive devices 2, and the bottom ends do not contact the bottom of the stirring cylinder 1, with a certain gap between them; a feed inlet 3, located at the top of the stirring cylinder 1, on one side of the line connecting the two stirring drive devices 2; and a discharge outlet 11, located on the bottom side of the stirring cylinder 1.

[0033] Among them, such as Figure 2 and Figure 3 As shown, the line connecting the axes of the first stirring shaft 51 and the second stirring shaft 52 passes through the axis of the stirring cylinder 1.

[0034] like Figure 3As shown, each of the stirring shafts 5 is equipped with multiple stirring blades 6 for breaking up the original soil clumps and promoting the flow of the fluidized solidified soil slurry. Specifically, multiple first stirring blades 61 are arranged at intervals on the first stirring shaft 51, and multiple second stirring blades 62 are arranged at intervals on the second stirring shaft 52. The first stirring blades 61 on the first stirring shaft 51 and the second stirring blades 62 on the second stirring shaft 52 are arranged alternately in the two axial directions. Specifically, in this embodiment, the length of the first stirring shaft 51 is longer than the length of the second stirring shaft 52. The first second stirring blade 62 on the second stirring shaft 52 has the highest installation height, while the first first stirring blade 61 on the first stirring shaft 51 has a lower installation height than the first second stirring blade 62, but higher than the second second stirring blade 62, and so on. The last second stirring blade 62 at the end of the second stirring shaft 52 has a higher installation height than the last first stirring blade 61 at the end of the first stirring shaft 51, forming a staggered arrangement. In other embodiments, the first stirring blades 61 and the second stirring blades 62 may be distributed in other ways, as long as they are staggered in the axial direction.

[0035] Furthermore, the distance between the axes of the first stirring shaft 51 and the second stirring shaft 52 is equal to the sum of the outer diameters of the first stirring blade 61 and the second stirring blade 62, that is, the projections of the two circular trajectories formed by the rotation of the first stirring blade 61 and the second stirring blade 62 on the horizontal plane are tangent.

[0036] Furthermore, the first stirring shaft 51 and the second stirring shaft 52 are respectively controlled by the stirring drive device 2 to rotate in the same direction. Each of the two stirring shafts drives the surrounding fluidized solidified soil slurry to flow. Due to the same-direction rotation, at the slurry confluence in the middle region between the two stirring shafts, the first stirring blade 61 and the second stirring blade 62 push the slurry in opposite directions. Therefore, the slurry will form a collision flow at the confluence, generating a strong shearing effect and promoting slurry dispersion. Simultaneously, because the first stirring blade 61 and the second stirring blade 62 are staggered, the first stirring shaft 51 and the second stirring shaft 52 will generate high-speed and low-speed zones at different locations, making the velocity difference between the two streams of slurry at the confluence greater, thus resulting in stronger shearing force.

[0037] Furthermore, the first stirring blade 61 and the second stirring blade 62 have the same structural shape and size. For example... Figure 6As shown, in this embodiment, each stirring blade 6 has four identical blades, and these four blades are evenly spaced, i.e., the interval between two adjacent blades is 90 degrees. In other embodiments, each stirring blade 6 can have multiple other numbers of identical blades, as long as all blades are evenly spaced. All stirring blades 6 are inclined relative to the horizontal plane, and the inclination directions of the first stirring blade 61 and the second stirring blade 62 relative to the horizontal plane are opposite. Specifically, the blades of the first stirring blade 61 on the first stirring shaft 51 are inclined upwards, while the blades of the second stirring blade 62 on the second stirring shaft 52 are inclined downwards. When the stirring device is running, the first stirring blade 61 on the first stirring shaft 51 pushes the mud upwards, and the second stirring blade 62 on the second stirring shaft 52 pushes the mud downwards, thus forming an up-and-down circulating mud flow, which accelerates dispersion.

[0038] Furthermore, such as Figure 3 and Figure 4 As shown, the second stirring shaft 52 is also equipped with multiple stirring rods 7. The stirring rods 7 are arranged perpendicular to the second stirring shaft 52, and each stirring rod 7 is alternately installed between every two adjacent second stirring blades 62. That is, on the second stirring shaft 52, the second stirring blades 62 and the stirring rods 7 are arranged alternately in the axial direction. The soil clods in the fluidized solidified soil slurry will be pushed by the second stirring blades 62 and the first stirring blades 61 and will collide with the stirring rods 7 and be broken up secondary.

[0039] like Figure 5 As shown, the stirring rod 7 is composed of two rods that cross vertically. One of the rods is also equipped with a first metal burr 71, which makes it easier for particles in the mud to break when they collide with it. Therefore, the setting of the stirring rod 7 is beneficial to the dispersion of highly viscous soil clods.

[0040] Furthermore, the outer diameter of the stirring rod 7 does not exceed the outer diameter of the stirring blade 6, and the distance between the end of the stirring blade 6 and the inner wall of the stirring cylinder 1 is not less than 5 cm and not more than 10 cm.

[0041] Each of the two stirring drive devices 2 is equipped with a stirring motor, which is controlled by a circuit and can adjust the rotation speed of the first stirring shaft 51 and the second stirring shaft 52 respectively.

[0042] Furthermore, the first stirring shaft 51 and the second stirring shaft 52 rotate at the same speed, controlled between 0 and 500 rpm. During operation, both the first stirring shaft 51 and the second stirring shaft 52 first stir at a low speed of 100-150 rpm for 3-4 minutes, and then stir at a high speed of 300 rpm for 2-3 minutes. In the low-speed stirring stage, the stirring device initially mixes the fluidized solidified soil, avoids splashing, reduces initial resistance and energy consumption, and protects the motor; in the high-speed stirring stage, the fluid flow rate and shear force are enhanced, which can fully mix the fluidized solidified soil, refine the particles, and improve the mixing uniformity.

[0043] The mixing drum 1 has an opening at its upper end and is equipped with a cover plate 4. The cover plate 4 seals the mixing drum 1, preventing the fluidized solidified soil from splashing to the outside. The feed inlet 3 and the two mixing drive devices 2 are all mounted on the cover plate 4. The cover plate 4 can be opened and closed flexibly, facilitating cleaning of the inside of the mixing drum 1 and handling of abnormal situations.

[0044] like Figure 4 As shown, an inclined baffle 9 is provided directly below the feed inlet 3 and is connected to the inner wall of the mixing cylinder 1. The inclined baffle 9 is inclined downward at an angle of 75°, which can guide the raw material of the fluidized solidified soil to the mixing area.

[0045] like Figure 3 As shown, a filter screen 10 is located directly below the second stirring shaft 52 and is connected to the inner wall of the stirring cylinder 1. The filter screen 10 is inclined downwards at an angle of 20° to 30°. The distance between the connection point of the filter screen 10 to the inner wall of the stirring cylinder 1 and the bottom of the stirring cylinder 1 is 40 to 60 cm. The mesh of the filter screen 10 is as shown in the figure. Figure 7 As shown, multiple evenly distributed small diamond-shaped holes are formed by the oblique intersection of wires. When the fluidized solidified soil slurry flows through the filter screen 10, the filter screen 10 can further break up and disperse the particles in the slurry. Larger particles collide with the filter screen 10 and break up, while the slurry and small particles pass through the filter screen 10 and reach the bottom of the mixing cylinder 1.

[0046] like Figure 3 and Figure 4As shown, multiple soil-breaking rods 8 are installed on the inner wall of the mixing cylinder 1. These rods are located on both sides of the inner wall of the intermediate region between the first mixing shaft 51 and the second mixing shaft 52, and are evenly distributed from top to bottom and from left to right in a matrix arrangement. All soil-breaking rods 8 are of equal length, ranging from 5 to 10 cm, and do not exceed the distance between the end of the mixing blade 6 and the inner wall of the mixing cylinder 1. The soil-breaking rods 8 are equipped with second metal burrs (not shown in the figure). Due to centrifugal force, some soil clumps are thrown onto the inner wall of the mixing cylinder 1 during the mixing process. The soil-breaking rods 8 can break up these soil clumps, and the second metal burrs on the soil-breaking rods 8 can further refine the particles in the soil clumps.

[0047] The bottom of the stirring device is a flat bottom 12, which is sealed to the stirring cylinder 1. The diameter of the flat bottom 12 is slightly larger than the diameter of the stirring cylinder 1. Around the stirring cylinder 1, four evenly distributed column feet connected by bolts are provided on the flat bottom 12 to support the stirring device.

[0048] Among them, such as Figure 4 As shown, the feed inlet 3 includes a feed opening 31 and a feed funnel 32. The feed funnel 32 is disposed on the cover plate 4, located in the middle of one side of the line connecting the two stirring drive devices 2, and its top end is connected to the feed opening 31. The raw material of the fluidized solidified soil enters the feed funnel 32 through the feed opening 31, and then is injected into the interior of the stirring cylinder 1 through the feed funnel 32.

[0049] Among them, such as Figure 4 As shown, the discharge port 11 includes a discharge pipe 111 and a discharge valve 112. The discharge valve 112 is installed on the discharge pipe 111 and controls the opening and closing of the discharge pipe 111. The discharge pipe 111 is connected to the bottom side of the mixing drum 1 and is located on the flat bottom 12, that is, the lowest point of the discharge pipe 111 is flush with the bottom of the mixing drum 1. After the fluidized solidified soil is mixed, it is discharged through the discharge pipe 111.

[0050] Although the present invention has been described in detail through the above preferred embodiments, it should be understood that the above description should not be considered as a limitation of the present invention. Various modifications and substitutions to the present invention will be apparent to those skilled in the art after reading the above content. Therefore, the scope of protection of the present invention should be defined by the appended claims.

Claims

1. A twin-shaft mixing device for fluidized solidified soil, characterized in that, include: Stirring cylinder (1); Two stirring drive devices (2) are set on top of the stirring cylinder (1); The first stirring shaft (51) and the second stirring shaft (52) are vertically arranged inside the stirring cylinder (1). Their top ends are respectively connected to the two stirring drive devices (2) and are controlled to rotate by the stirring drive devices (2). Their bottom ends are set at a certain distance from the bottom of the stirring cylinder (1). The first stirring shaft (51) and the second stirring shaft (52) rotate in the same direction. In this arrangement, a plurality of first stirring blades (61) are arranged at intervals on the first stirring shaft (51), and a plurality of second stirring blades (62) are arranged at intervals on the second stirring shaft (52). The first stirring blades (61) arranged on the first stirring shaft (51) and the second stirring blades (62) arranged on the second stirring shaft (52) are staggered upward on the two shafts. The blades of the first stirring blade (61) and the second stirring blade (62) are both inclined relative to the horizontal plane, and the inclination directions of the blades of the first stirring blade (61) and the second stirring blade (62) relative to the horizontal plane are opposite.

2. The twin-shaft mixing device for fluidized solidified soil according to claim 1, characterized in that, The line connecting the axes of the first stirring shaft (51) and the second stirring shaft (52) passes through the axis of the stirring cylinder (1), and the distance between the axes of the first stirring shaft (51) and the second stirring shaft (52) is equal to the sum of the outer diameters of the first stirring blade (61) and the second stirring blade (62).

3. The twin-shaft mixing device for fluidized solidified soil according to claim 2, characterized in that, The first stirring blade (61) and the second stirring blade (62) have the same structure, shape and size. The distance between the end of the first stirring blade (61) and the inner wall of the stirring cylinder (1) is not less than 5cm and not more than 10cm.

4. The twin-shaft mixing device for fluidized solidified soil according to claim 1, characterized in that, The second stirring shaft (52) is also provided with a plurality of stirring rods (7). The stirring rods (7) are arranged perpendicular to the second stirring shaft (52) and are arranged alternately with the second stirring blade (62) on the second stirring shaft (52). The outer diameter of the stirring rods (7) does not exceed the outer diameter of the second stirring blade (62).

5. The twin-shaft mixing device for fluidized solidified soil according to claim 4, characterized in that, The stirring rod (7) is equipped with a first metal burr (71).

6. The twin-shaft mixing device for fluidized solidified soil according to claim 1, characterized in that, The two stirring drive devices (2) respectively adjust the rotation speed of the first stirring shaft (51) and the second stirring shaft (52). The rotation speed of the first stirring shaft (51) and the second stirring shaft (52) is the same, which is 0 to 500 rpm.

7. The twin-shaft mixing device for fluidized solidified soil according to claim 1, characterized in that, The length of the second stirring shaft (52) is shorter than that of the first stirring shaft (51). A filter screen (10) is provided directly below the second stirring shaft (52) and is connected to the inner wall of the stirring cylinder (1). The filter screen (10) is inclined downward and the distance between the connection point of the filter screen (10) and the inner wall of the stirring cylinder (1) and the bottom of the stirring cylinder (1) is 40-60cm.

8. The twin-shaft mixing device for fluidized solidified soil according to claim 1, characterized in that, Multiple soil-breaking rods (8) are installed on the inner wall of the mixing cylinder (1). The soil-breaking rods (8) are located on both sides of the inner wall of the mixing cylinder (1) in the middle area between the first mixing shaft (51) and the second mixing shaft (52), and are arranged in a matrix uniformly. All soil-breaking rods (8) are of equal length and do not exceed the distance from the end of the first mixing blade (61) and the second mixing blade (62) to the inner wall of the mixing cylinder (1). The soil-breaking rods (8) are also equipped with second metal burrs.

9. The twin-shaft mixing device for fluidized solidified soil according to claim 1, characterized in that, The upper end of the stirring cylinder (1) is open and is provided with a cover plate (4). The cover plate (4) is provided with a feed inlet (3). Both stirring drive devices (2) are installed on the cover plate (4). The feed inlet (3) is located on one side of the line connecting the two stirring drive devices (2). The bottom side of the stirring cylinder (1) is provided with a discharge port (11).

10. The twin-shaft mixing device for fluidized solidified soil according to claim 9, characterized in that, An inclined baffle (9) is provided directly below the feed inlet (3) and is connected to the inner wall of the mixing cylinder (1). The inclined baffle (9) is inclined downward.

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