A soil mixing device

Abstract

The application discloses a soil material stirring device and relates to the technical field of stirring equipment. The device comprises a stirring cylinder, which can rotate along its own axis; a spiral feeding piece, which is spirally installed on the inner side wall of the stirring cylinder along the axial direction of the stirring cylinder and is provided with a material stopping interval along the spiral direction of the spiral feeding piece; a plurality of material returning baffles, which are spirally and intervally arranged along the axial direction of the stirring cylinder, and the spiral direction of each material returning baffle is opposite to the spiral direction of the spiral feeding piece; a mixed material conveying belt, which extends to the inside of the stirring cylinder at one end and is used for feeding aeolian soil material and bentonite into the feeding end of the stirring cylinder; and a storage hopper, which is used for storing bentonite, and the discharge port of the storage hopper is located above the end of the mixed material conveying belt opposite to the stirring cylinder. The discharge port of the storage hopper is matched with a material distributing roller, the length direction of the material distributing roller is parallel to the width direction of the mixed material conveying belt, the side wall of the material distributing roller is provided with a plurality of material distributing grooves, and the plurality of material distributing grooves are uniformly distributed along the circumferential direction of the material distributing roller. The application can continuously stir and output, and the mixing efficiency is high.

Description

Technical Field

[0001] This invention relates to the field of mixing equipment technology, and specifically to a soil mixing device. Background Technology

[0002] In existing technologies, water conservancy projects located in ecologically fragile areas with stringent environmental protection requirements and complex regional geological structures mostly employ earth-rockfill dams, resulting in a massive demand for impermeable soil materials used as the core wall. To meet the demand for impermeable soil materials in earth-rockfill dams, construction is carried out by mining soil materials locally. The soil materials in these areas are mainly of two origins: aeolian and lacustrine. Aeolian silt is relatively uniform in texture, has a small stripping ratio, and offers favorable mining conditions. Aeolian silt deposits have advantages such as pure soil and low permeability coefficient, but its composition is mainly silt with a low clay content, requiring mixing with bentonite before use. Lacustrine clayey soil, on the other hand, has a high clay content and a high natural moisture content, requiring moisture reduction before use. Compared to reducing the moisture content of the soil, mixing materials is more cost-effective and efficient; therefore, these projects mostly use a mixture of aeolian silt and bentonite as impermeable soil materials.

[0003] Typically, in a mixture of aeolian soil and bentonite, the dry weight ratio of bentonite needs to be controlled between 0.1 and 0.2. Since bentonite is a powder, if a conventional mixer is used, the bentonite and aeolian soil are weighed according to the corresponding weight ratio and then added to the mixing container for mixing. This method cannot be used for continuous production. Furthermore, the aeolian soil and bentonite are relatively separate before mixing, and it takes a long time to mix them evenly. This results in low mixing efficiency and makes it difficult to meet the construction requirements of large-scale earth-rockfill dams. Summary of the Invention

[0004] To address the technical problem of low efficiency in mixing aeolian soil and bentonite using existing mixers, this invention provides a soil mixing device that can quantitatively premix aeolian soil and bentonite, and can continuously mix and output the mixture with high mixing efficiency, meeting the construction needs of large-scale earth-rockfill dams.

[0005] This invention is achieved through the following technical solution:

[0006] This invention provides a soil mixing device, comprising: a mixing drum capable of rotating along its own axis; a spiral feeder blade spirally mounted on the inner wall of the mixing drum along its axial direction, with stopping intervals spaced apart along the spiral direction of the spiral feeder blade; multiple return baffles spirally spaced apart along the axial direction of the mixing drum, the spiral direction of each return baffle being opposite to that of the spiral feeder blade; and a mixing conveyor belt extending at one end into the mixing drum for conveying aeolian soil and bentonite into the mixing drum. The mixing drum has an inlet end and a storage hopper for storing bentonite. The outlet of the storage hopper is located above the end of the mixing conveyor belt directly opposite the mixing drum. The outlet of the storage hopper is equipped with a distribution roller. The length direction of the distribution roller is parallel to the width direction of the mixing conveyor belt. The side wall of the distribution roller is provided with multiple distribution grooves, which are evenly distributed around the circumference of the distribution roller. When the mixing drum rotates, the mixture inside the mixing drum can move from the inlet end to the outlet end.

[0007] The soil mixing device provided by this invention has a spiral feeding plate installed inside a mixing drum that can rotate along its own axis. One end of a mixing conveyor belt extends into the mixing drum. Through the movement of the mixing conveyor belt, aeolian soil and bentonite are fed into the feed end of the mixing drum. By rotating the mixing drum, the relative movement between the spiral feeding plate and the mixing material can push the mixing material in the mixing drum to move along the axial direction of the mixing drum. At the same time, the mixing material is granular and difficult to rotate with the rotation of the mixing drum. Therefore, during the rotation of the mixing drum, the mixing material rolls down continuously to achieve initial mixing. The spiral feeding plate is provided with stopping intervals at intervals along the spiral direction, so that there are brief intervals when the feeding plate is conveying the mixed soil. At this time, the subsequently input mixed soil will be stacked with the mixed soil that has been briefly stopped to achieve re-mixing.

[0008] Meanwhile, multiple return baffles are spirally spaced along the axial direction of the mixing drum. The spiral direction of the return baffles is opposite to that of the spiral feed plates. During the rotation of the mixing drum, the relative movement of the return baffles and the mixture pushes some of the mixture inside the mixing drum in the opposite direction, thus mixing with the mixture pushed by the spiral feed plates, achieving three-stage mixing. The mixture then continues to move towards the discharge end of the mixing drum through the spiral feed plates, and after multiple mixing cycles, it is output from the discharge end of the mixing drum, thus fully mixing the aeolian soil and bentonite, and continuously outputting the mixture to achieve continuous production.

[0009] Additionally, the system includes a bentonite storage hopper. The hopper's outlet is located above the end of the mixing conveyor belt directly opposite the mixing drum. The outlet is equipped with a distribution roller, whose length is parallel to the width of the mixing conveyor belt. Multiple distribution grooves are evenly distributed along the circumference of the roller. Therefore, when the hopper contains bentonite, it can be quantitatively distributed into the distribution grooves. The rotation of the distribution roller causes the groove openings to face the mixing conveyor belt. Under centrifugal force and gravity, the bentonite is then sprayed onto the conveyor belt, thus quantitatively pre-mixing the aeolian soil with the bentonite. Because the bentonite is distributed onto the conveyor belt under centrifugal force and gravity, it is spread in a surface manner, ensuring sufficient contact between the bentonite and the aeolian soil, reducing the subsequent mixing time, and thus improving mixing efficiency.

[0010] In summary, the soil mixing device provided by this invention can quantitatively premix aeolian soil with bentonite, and can continuously mix and output the mixture, resulting in high mixing efficiency and meeting the construction needs of large-scale earth-rockfill dams.

[0011] In an optional embodiment, the feed port of the mixing drum is provided with multiple spray heads, which are arranged around the circumference of the mixing drum, and the nozzles of each spray head are directly facing the rotation axis of the mixing drum. On the one hand, the water mist sprayed by the spray heads forms a water curtain to prevent dust generated during subsequent bentonite laying, mixture laying, and mixing of the mixture from escaping. On the other hand, it can replenish water to the mixture so that the moisture content of the mixture meets the filling requirements.

[0012] In an optional embodiment, a scraper is also included, which is located above the mixture conveyor belt; along the conveying direction of the mixture conveyor belt, the scraper is located behind the discharge end of the storage hopper, and is used to scrape the aeolian soil on the mixture conveyor belt to spread the aeolian soil flat so that the aeolian soil has sufficient area to receive bentonite.

[0013] In an optional embodiment, barriers are provided on both sides of the conveyor belt in the conveying direction of the mixture, the distance between the two barriers is adapted to the width of the conveyor belt, and the lower ends of the scraper and the storage hopper extend into the space enclosed by the two barriers, so as to prevent the wind-blown soil scraped off by the scraper from rolling off the side of the conveyor belt and to prevent bentonite from spilling outside the conveyor belt.

[0014] In an optional embodiment, a comb tooth is provided on one side of the lower end of the scraper. Along the conveying direction of the mixture conveyor belt, the comb tooth is located behind the scraper so that multiple grooves are formed on the surface of the aeolian soil through the relative movement of the comb tooth and the aeolian soil, thereby further expanding the contact area between the aeolian soil and the bentonite.

[0015] In an optional embodiment, two driven rollers are also adapted to the discharge port of the storage hopper. Along the width direction of the discharge port of the storage hopper, the two driven rollers are located on both sides of the storage hopper, and the distributing roller is located between the two driven rollers. The two driven rollers rotate along their own axis under the friction of the distributing roller. By cooperating with the two driven rollers and the distributing roller to block the discharge end of the storage hopper, the discharge port of the storage hopper can have a sufficient cross-sectional area, thereby avoiding the formation of bentonite arches that prevent normal material distribution. At the same time, the rotation of the two driven rollers can prevent the bentonite from sticking to the wall, so that the bentonite in the storage hopper can be completely discharged.

[0016] In an optional embodiment, the distributing trough is provided with multiple elastic metal wires, which are spaced apart along the length of the distributing trough. One end of each elastic metal wire is fixed to the bottom of the distributing trough, and the other end protrudes from the circumference of the distributing roller. This provides the elastic metal wires with the ability to brush away the bentonite adhering to the driven roller, and also prevents the bentonite in the distributing trough from caking into lumps. The elastic metal wires are bent after contacting the driven roller and then recover after detaching from the driven roller, thereby loosening the bentonite in the distributing trough and ensuring that the bentonite in the distributing trough can be completely discharged.

[0017] In an optional embodiment, a drive frame is also included, with a drive wheel row on one side of the upper end of the drive frame and a support wheel row on the other side. The lower side of the stirring drum abuts against the drive wheel row and the support wheel row, so as to drive the stirring drum to rotate along its own axis by the rotation of the drive wheel row.

[0018] In an optional embodiment, the inner wall of the mixing drum is provided with multiple arc-shaped protrusions. On the one hand, the arc-shaped protrusions can push the mixture to a higher height when the mixing drum rotates. On the other hand, the arc-shaped protrusions can prevent the mixture from sticking to the inner wall of the mixing drum.

[0019] In an optional embodiment, the width of the return baffle is smaller than the width of the spiral feeder, and the distance between two adjacent return baffles is greater than the arc of the stop interval, so as to ensure that the spiral feeder can effectively deliver the mixture from the mixing tank.

[0020] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0021] 1. The soil mixing device provided by this invention includes a spiral feeding plate inside a mixing drum that can rotate along its own axis. One end of a mixing conveyor belt extends into the mixing drum. Through the movement of the mixing conveyor belt, aeolian soil and bentonite are fed into the feed end of the mixing drum. The rotation of the mixing drum, along with the relative movement of the spiral feeding plate and the mixing material, pushes the mixing material within the mixing drum along the axial direction of the drum. Since the mixing material is granular, it is difficult for it to rotate with the mixing drum. Therefore, during the rotation of the mixing drum, the mixing material continuously rolls down, thus performing initial mixing. Stopping intervals are provided at intervals along the spiral direction of the spiral feeding plate, allowing for brief pauses in the feeding of the mixed soil material. During these pauses, subsequent mixing... The input mixed soil material is stacked with the temporarily retained mixed soil material to achieve re-mixing. At the same time, multiple return baffles are spirally arranged along the axis of the mixing drum. The spiral direction of the return baffles is opposite to that of the spiral feed plate. During the rotation of the mixing drum, the relative movement of the return baffles and the mixed material can push some of the mixed material in the mixing drum to move in the opposite direction, thereby mixing with the mixed material pushed by the spiral feed plate, achieving three-stage mixing. Then, it continues to move towards the discharge end of the mixing drum by being pushed by the spiral feed plate. After multiple mixing cycles, it is output from the discharge end of the mixing drum, thus fully mixing the aeolian soil and bentonite, and continuously outputting it to achieve continuous production and meet the material production needs of seepage prevention soil for earth-rockfill dams.

[0022] 2. The soil mixing device provided by the present invention further includes a storage hopper for storing bentonite. The outlet of the storage hopper is located above the end of the mixing conveyor belt directly opposite the mixing drum. The outlet of the storage hopper is equipped with a distribution roller. The length direction of the distribution roller is parallel to the width direction of the mixing conveyor belt. The side wall of the distribution roller is provided with multiple distribution grooves. The multiple distribution grooves are evenly distributed along the circumference of the distribution roller. Therefore, when bentonite is stored in the storage hopper, the bentonite can quantitatively enter the distribution grooves. Through the rotation of the distribution roller, the opening of the distribution groove can be made to face the mixing conveyor belt. At this time, the bentonite is sprinkled onto the mixing conveyor belt under the action of centrifugal force and gravity, thereby quantitatively premixing the aeolian soil with the bentonite. Since the bentonite is sprinkled onto the mixing conveyor belt under the action of centrifugal force and gravity, the bentonite is distributed in a surface distribution manner, which can make the bentonite and the aeolian soil fully contacted, reduce the subsequent mixing time, and thus improve the mixing efficiency. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0024] In the attached diagram:

[0025] Figure 1 This is a schematic diagram of the soil mixing device according to an embodiment of the present invention;

[0026] Figure 2 for Figure 1 Enlarged schematic diagram of part A;

[0027] Figure 3 This is a schematic diagram of the structure of the stirring cylinder placed on the drive frame in an embodiment of the present invention.

[0028] The attached diagram shows the markings and corresponding component names:

[0029] 10-Mixing drum, 11-Spray head, 12-Arc-shaped protrusion, 20-Spiral feeder, 21-Stop interval, 30-Return baffle, 40-Mixed material conveyor belt, 41-Enclosure, 50-Storage hopper, 60-Distribution roller, 61-Distribution trough, 62-Elastic metal wire, 70-Scraper, 71-Comb teeth, 80-Driven roller, 90-Drive frame, 91-Drive wheel row, 92-Support wheel row. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0031] In the description of the embodiments of this application, the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the product of this application is usually placed in when in use, or the orientation or positional relationship that is commonly understood by those skilled in the art. It is only for the convenience of describing this application and simplifying the description, and is not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this application.

[0032] In the description of this invention, unless otherwise explicitly specified and limited, the terms "set up," "have," "install," "connect," and "link" 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 direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0033] Example

[0034] Combination Figure 1 and Figure 2 This embodiment provides a soil mixing device, including: a mixing drum 10, capable of rotating along its own axis; a spiral feed plate 20, spirally installed on the inner wall of the mixing drum 10 along its axial direction, and with stopping intervals 21 spaced apart along the spiral direction of the spiral feed plate 20; multiple return baffles 30, spirally spaced apart along the axial direction of the mixing drum 10, with the spiral direction of each return baffle 30 opposite to that of the spiral feed plate 20; and a mixing conveyor belt 40, one end of which extends into the mixing drum 10 for feeding aeolian soil and bentonite into the mixing drum 10. The mixing drum 10 has a feed end; a storage hopper 50 for storing bentonite, the discharge port of the storage hopper 50 being located above one end of the mixing conveyor belt 40 directly opposite the mixing drum 10, the discharge port of the storage hopper 50 being fitted with a distribution roller 60, the length direction of the distribution roller 60 being parallel to the width direction of the mixing conveyor belt 40, and the side wall of the distribution roller 60 being provided with a plurality of distribution grooves 61, the plurality of distribution grooves 61 being evenly distributed along the circumference of the distribution roller 60; wherein, when the mixing drum 10 rotates, the mixture located in the mixing drum 10 can move from the feed end of the mixing drum 10 to the discharge end.

[0035] It should be noted that the mixing conveyor belt 40 can be installed at an angle using a bracket or parallel to the ground, as long as it can transport the blower material to the storage pipe. In this embodiment, it is installed parallel to the ground. The storage hopper 50 is erected above the mixing conveyor belt 40 using a bracket. The discharge port of the storage hopper 50 is equipped with a distributing roller 60. The length direction of the distributing roller 60 is parallel to the width direction of the mixing conveyor belt 40. That is, the distributing roller 60 blocks the discharge port of the storage hopper 50 to prevent the bentonite in the storage hopper 50 from sliding down directly. Multiple distributing grooves 61 are provided on the side wall of the distributing roller 60. The multiple distributing grooves 61 are evenly distributed along the circumference of the distributing roller 60. When the storage hopper 50 contains bentonite, the bentonite can enter the distributing grooves 61 in a quantitative manner. By rotating the distributing roller 60, the opening of the distributing grooves 61 can be made to face the mixing conveyor belt 40. At this time, the bentonite is sprinkled onto the mixing conveyor belt 40 under the action of centrifugal force and gravity, thereby quantitatively premixing the aeolian soil with the bentonite. As the bentonite is sprayed onto the mixing conveyor belt 40 under the action of centrifugal force and gravity, the bentonite is distributed in a surface manner, which allows the bentonite to fully contact the aeolian soil, reduces the time required for subsequent mixing, and thus improves the mixing efficiency.

[0036] Based on this, this embodiment also includes a scraper 70, which is located above the mixing conveyor belt 40. Along the conveying direction of the mixing conveyor belt 40, the scraper 70 is located behind the discharge end of the storage hopper 50, and is used to scrape the aeolian soil on the mixing conveyor belt 40 to spread the aeolian soil flat so that the aeolian soil has enough area to receive bentonite.

[0037] Correspondingly, both sides of the conveyor belt 40 are provided with barriers 41 in the conveying direction. The distance between the two barriers 41 is adapted to the width of the conveyor belt 40. The lower ends of the scraper 70 and the storage hopper 50 extend into the space enclosed by the two barriers 41 to prevent the wind-blown soil scraped off by the scraper from rolling off the side of the conveyor belt 40 and to prevent bentonite from spilling outside the conveyor belt 40.

[0038] Furthermore, a comb tooth 71 is provided on one side of the lower end of the scraper 70. Along the conveying direction of the mixed material conveyor belt 40, the comb tooth 71 is located on the rear side of the scraper 70. Through the relative movement of the comb tooth 71 and the aeolian soil, multiple grooves are formed on the surface of the aeolian soil, further expanding the contact area between the aeolian soil and the bentonite.

[0039] One end of the mixing conveyor belt 40 extends into the mixing drum 10. The movement of the mixing conveyor belt 40 feeds the premixed aeolian soil and bentonite into the feed end of the mixing drum 10. The rotation of the mixing drum 10 and the relative movement of the spiral feeder 20 and the mixing material push the mixing material in the mixing drum 10 to move along the axial direction of the mixing drum 10. Since the mixing material is granular, it is difficult to rotate with the rotation of the mixing drum 10. Therefore, during the rotation of the mixing drum 10, the mixing material rolls down to achieve initial mixing. The spiral feeder 20 is provided with stopping intervals 21 at intervals along the spiral direction, so that there is a short interval when the feeder is conveying the mixed soil. At this time, the subsequently input mixed soil will be stacked with the mixed soil that has stopped briefly to achieve remixing.

[0040] Meanwhile, multiple return baffles 30 are spirally spaced along the axial direction of the mixing drum 10. The spiral direction of the return baffles 30 is opposite to that of the spiral feeder 20. During the rotation of the mixing drum 10, the relative movement of the return baffles 30 and the mixture pushes some of the mixture inside the mixing drum 10 to move in the opposite direction, thereby mixing with the mixture pushed by the spiral feeder 20, achieving three-stage mixing. Then, the mixture continues to move towards the discharge end of the mixing drum 10 through the pusher of the spiral feeder 20, and after multiple mixing cycles, it is output from the discharge end of the mixing drum 10, thus fully mixing the aeolian soil and bentonite, and continuously outputting it to achieve continuous production.

[0041] Specifically, the width of the return material baffle 30 is smaller than the width of the spiral feeder 20, and the distance between two adjacent return material baffles 30 is greater than the arc of the stop interval 21, so as to ensure that the spiral feeder 20 can effectively deliver the mixture from the mixing tank.

[0042] Combination Figure 2 The mixing drum 10 is provided with multiple spray heads 11 at its feed port. The multiple spray heads 11 are arranged around the mixing drum 10, and the nozzles of each spray head 11 are directly facing the rotation axis of the mixing drum 10. On the one hand, the water mist sprayed by the spray heads 11 forms a water curtain to prevent dust generated during subsequent bentonite laying, mixture laying, and mixing of the mixture from escaping. On the other hand, it can replenish water to the mixture so that the moisture content of the mixture meets the filling requirements.

[0043] Combined again Figure 2 The discharge port of the storage hopper 50 is also equipped with two driven rollers 80. Along the width direction of the discharge port of the storage hopper 50, the two driven rollers 80 are located on both sides of the storage hopper 50, and the distributing roller 60 is located between the two driven rollers 80. The two driven rollers 80 rotate along their own axis under the friction of the distributing roller 60. By cooperating with the two driven rollers 80 and the distributing roller 60 to block the discharge end of the storage hopper 50, the discharge port of the storage hopper 50 can have a sufficient cross-sectional area, thereby avoiding the formation of bentonite arches that prevent normal material distribution (bentonite has poor fluidity). At the same time, the rotation of the two driven rollers 80 can prevent the bentonite from sticking to the wall, so that the bentonite in the storage hopper 50 can be completely discharged.

[0044] In an optional embodiment, the distributing trough 61 is provided with a plurality of elastic metal wires 62, which are spaced apart along the length of the distributing trough 61. One end of each elastic metal wire 62 is fixed to the bottom of the distributing trough 61, and the other end protrudes from the circumference of the distributing roller 60. This provides the elastic metal wires 62 with the ability to brush away the bentonite adhering to the driven roller 80, and also prevents the bentonite in the distributing trough 61 from caking into lumps (bentonite has a high clay content and is easily compressed into lumps). The elastic metal wires 62 are bent after contacting the driven roller 80 and recover after detaching from the driven roller 80, thereby loosening the bentonite in the distributing trough 61 and ensuring that the bentonite in the distributing trough 61 can be completely discharged.

[0045] Combination Figure 3It should be understood that this embodiment also includes a drive frame 90, on one side of the upper end of which a drive wheel row 91 is provided and on the other side a support wheel row 92 is provided. The lower side of the stirring drum 10 abuts against the drive wheel row 91 and the support wheel row 92, so that the rotation of the drive wheel row 91 drives the stirring drum 10 to rotate along its own axis. The drive wheel can be a gear, a rigid wheel, or a flexible wheel. This type of structure is the drive structure used in stirring drums in this art, and will not be described in detail in this embodiment.

[0046] In addition, the inner wall of the mixing drum 10 is provided with a plurality of arc-shaped protrusions 12. On the one hand, when the mixing drum 10 rotates, the arc-shaped protrusions 12 can push the mixture to a higher height. On the other hand, the arc-shaped protrusions 12 can prevent the mixture from sticking to the inner wall of the mixing drum 10.

[0047] In summary, the soil mixing device provided in this embodiment, when storing bentonite in the storage hopper 50, allows the bentonite to enter the distribution trough 61 under its own weight. The rotation of the distribution roller 60 causes the opening of the distribution trough 61 to face the mixing conveyor belt 40. At this time, the bentonite is sprayed onto the mixing conveyor belt 40 under the action of centrifugal force and gravity, thus quantitatively pre-mixing the aeolian soil with the bentonite. Because the bentonite is sprayed onto the mixing conveyor belt 40 under the action of centrifugal force and gravity, it is distributed in a surface manner, allowing for sufficient contact between the bentonite and the aeolian soil, reducing the subsequent mixing time and improving mixing efficiency. Since the volume of the distribution trough 61 is fixed, the volume of bentonite delivered in a single batch is fixed, enabling quantitative mixing. Therefore, by controlling the moving speed of the mixing conveyor belt and the distribution speed of the aeolian soil, quantitative proportioning can be achieved without the need for a dedicated metering device.

[0048] Then, the aeolian soil and bentonite are fed into the feed end of the mixing drum 10 by the mixing conveyor belt 40. As the mixing drum 10 rotates, the relative movement of the spiral feeder 20 and the mixture pushes the mixture in the mixing drum 10 to move along the axial direction of the mixing drum 10. Since the mixture is a granular material, it is difficult to rotate with the rotation of the mixing drum 10. Therefore, during the rotation of the mixing drum 10, the mixture rolls down continuously to achieve initial mixing. The spiral feeder 20 is provided with stopping intervals 21 at intervals along the spiral direction, so that there is a short interval when the feeder is conveying the mixed soil. At this time, the subsequently input mixed soil will be stacked with the mixed soil that has stopped briefly to achieve re-mixing.

[0049] Meanwhile, since the spiral direction of the return baffle 30 is opposite to that of the spiral feed plate 20, during the rotation of the mixing drum 10, the relative movement of the return baffle 30 and the mixture can push some of the mixture inside the mixing drum 10 to move in the opposite direction, thereby mixing with the mixture pushed by the spiral feed plate 20, achieving three-stage mixing. Then, the mixture continues to move towards the discharge end of the mixing drum 10 through the pushing of the spiral feed plate 20, and after multiple mixing cycles, it is output from the discharge end of the mixing drum 10, thus fully mixing the aeolian soil and bentonite, and continuously outputting it to achieve continuous production.

[0050] In summary, the soil mixing device provided by this invention can quantitatively premix aeolian soil with bentonite, and can continuously mix and output the mixture, resulting in high mixing efficiency and meeting the construction needs of large-scale earth-rockfill dams.

[0051] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A soil mixing device, characterized in that, include: The stirring drum (10) is capable of rotating along its own axis; The spiral feeder (20) is spirally installed on the inner side wall of the mixing drum (10) along the axial direction of the mixing drum (10), and a stop interval (21) is provided at intervals along the spiral direction of the spiral feeder (20); Multiple return material baffles (30) are spirally spaced along the axial direction of the mixing drum (10), and the spiral direction of each return material baffle (30) is opposite to the spiral direction of the spiral feeding plate (20). A mixing conveyor belt (40) extends at one end into the mixing drum (10) to feed aeolian soil and bentonite into the feed end of the mixing drum (10); A storage hopper (50) is used to store bentonite. The outlet of the storage hopper (50) is located above one end of the mixing conveyor belt (40) directly opposite the mixing drum (10). The outlet of the storage hopper (50) is equipped with a distribution roller (60). The length direction of the distribution roller (60) is parallel to the width direction of the mixing conveyor belt (40). The side wall of the distribution roller (60) is provided with a plurality of distribution grooves (61). The plurality of distribution grooves (61) are evenly distributed along the circumference of the distribution roller (60). When the mixing drum (10) rotates, the mixture inside the mixing drum (10) can move from the feed end to the discharge end of the mixing drum (10).

2. The soil mixing device according to claim 1, characterized in that, The feed port of the mixing drum (10) is provided with a plurality of spray heads (11), which are arranged around the circumference of the mixing drum (10), and the nozzles of each spray head (11) are directly facing the rotation axis of the mixing drum (10).

3. The soil mixing device according to claim 1, characterized in that, It also includes a scraper (70) located above the mixture conveyor belt (40); Along the conveying direction of the mixed material conveyor belt (40), the scraper (70) is located behind the discharge end of the storage hopper (50) and is used to scrape the aeolian soil on the mixed material conveyor belt (40) flat.

4. The soil mixing device according to claim 3, characterized in that, Both sides of the conveyor belt (40) of the mixture are provided with enclosures (41) in the conveying direction. The distance between the two enclosures (41) is adapted to the width of the conveyor belt (40), and the lower end of the scraper (70) and the lower end of the storage hopper (50) extend into the space enclosed by the two enclosures (41).

5. The soil mixing device according to claim 3, characterized in that, A comb tooth (71) is provided on one side of the lower end of the scraper (70), and the comb tooth (71) is located behind the scraper (70) along the transmission direction of the mixture conveyor belt (40).

6. The soil mixing device according to claim 1, characterized in that, The discharge port of the storage hopper (50) is also equipped with two driven rollers (80). Along the width direction of the discharge port of the storage hopper (50), the two driven rollers (80) are located on both sides of the storage hopper (50), and the distributing roller (60) is located between the two driven rollers (80). The two driven rollers (80) rotate along their own axis under the friction of the distributing roller (60).

7. The soil mixing device according to claim 6, characterized in that, Multiple elastic metal wires (62) are provided inside the material distribution groove (61). The multiple elastic metal wires (62) are spaced apart along the length direction of the material distribution groove (61), and one end of the elastic metal wire (62) is fixed to the bottom of the material distribution groove (61), and the other end protrudes from the circumference of the material distribution roller (60).

8. The soil mixing device according to claim 1, characterized in that, It also includes a drive frame (90), on one side of the upper end of the drive frame (90) is a drive wheel row (91) and on the other side is a support wheel row (92), and the lower side of the stirring drum (10) abuts against the drive wheel row (91) and the support wheel row (92).

9. The soil mixing device according to any one of claims 1 to 8, characterized in that, The inner wall of the stirring cylinder (10) is provided with multiple arc-shaped protrusions (12).

10. The soil mixing device according to any one of claims 1 to 8, characterized in that, The width of the return material baffle (30) is smaller than the width of the spiral feeder (20), and the distance between two adjacent return material baffles (30) is greater than the arc of the stop interval (21).

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