Production device of nano foaming soil conservation agent for mine remediation

Abstract

The invention provides a production device of a nano foaming soil conservation agent for mine remediation, and relates to the technical field of soil conservation agent production. The production device of the nano foaming soil conservation agent for mine remediation comprises a rack, a stirring barrel and a stirring assembly composed of a transmission part, a main stirring part and a plurality of auxiliary stirring parts, the auxiliary stirring parts are distributed around the circumference of the main stirring part, the outer edge of an elastic scraper of each auxiliary stirring part is attached to the inner wall of the stirring barrel, and trapezoidal retention blocks are arranged on the two sides of each auxiliary stirring part; the main stirring piece generates axial and radial flow through the stirring paddle, and the transmission part adopts a planetary gear train to drive the main stirring piece and the auxiliary stirring piece to reversely rotate to form a composite flow field. According to the device, a multi-dimensional flow field is constructed through reverse synergistic rotation of the main stirring piece and the branch stirring piece, the problems of nano material agglomeration, particle sedimentation and uneven mixing are solved by combining wall scraping of the elastic scraping plate and solid material pushing of the trapezoidal retention block, the device is suitable for efficient mixing of a high-viscosity multiphase system, and the uniformity and stability of a product are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of soil conservation agent production, in particular to a nano-foaming soil conservation agent production device for mine restoration. Background Art

[0002] In the field of mine remediation, nano-foaming soil conservation agent is a functional composite preparation developed for ecological governance scenarios such as mine remediation. Its core feature is to construct a porous system with a stable nano-bubble structure and a three-dimensional network skeleton at the microscale through the synergistic effect of nano-foaming technology and multiple components. Its production process usually requires the uniform mixing of nano-scale materials (such as nano-silica, high molecular polymers) with humic acid, water-retaining agents and other ingredients to form a composite system with a porous structure and high water retention capacity.

[0003] Traditional mixing equipment, often using single-shaft or dual-shaft co-directional mixing mechanisms, presents the following challenges when processing soil conservancy agents for mine remediation: The main and secondary mixing elements lack synergistic motion, resulting in mechanical disturbance in only a single direction and making it difficult to create a composite flow field within the cylinder encompassing axial, radial, and circumferential directions. This flow field limitation prevents the effective dispersion of nanomaterials due to a lack of multi-dimensional shear forces, leading to the formation of aggregates. Furthermore, solid particles, under the influence of gravity, struggle to maintain suspension and gradually settle to the bottom of the cylinder, causing stratification and impacting the mixing uniformity and functional stability of the soil conservancy agent.

[0004] To this end, we have developed a new nano-foaming soil conservation agent production device for mine remediation. Summary of the Invention

[0005] (1) Technical problems solved

[0006] In response to the shortcomings of the existing technology, the present invention provides a nano-foaming soil conservation agent production device for mine remediation, which solves the problems of existing mixing equipment due to a single stirring mode and lack of multi-dimensional shearing effect, resulting in nano-material agglomeration, solid particle sedimentation and uneven material mixing.

[0007] (2) Technical solution

[0008] To achieve the above objectives, the present invention is implemented through the following technical solutions: A production device for a nano-foamed soil nutrient agent for mine remediation, comprising a frame, a mixing drum fixedly mounted on the frame, a mixing assembly fixedly mounted inside the mixing drum, the mixing assembly comprising a transmission component, a main stirring member, and a plurality of sub-stirring members, the plurality of sub-stirring members surrounding the main stirring member and being evenly distributed circumferentially;

[0009] The sub-stirring element includes a first rotating shaft, and a plurality of elastic scrapers are fixedly installed in a circular array on the circumferential side of the first rotating shaft. The outer edge of the elastic scraper is in contact with the inner wall of the mixing drum. Both sides of the elastic scraper are fixedly connected with a plurality of trapezoidal retention blocks in a linear array, and two adjacent trapezoidal retention blocks are symmetrically arranged.

[0010] Preferably, the main stirring member includes a second rotating shaft, and a stirring paddle is fixedly mounted on the peripheral side of the second rotating shaft.

[0011] Preferably, the transmission component includes a first base and a second base fixedly mounted on the two inner sides of the mixing drum, a gear ring is fixedly mounted on the inner circumferential side of the first base, a plurality of planetary gears are meshed with the gear ring, the plurality of planetary gears are arranged in a circular array, and a sun gear is meshed with each other.

[0012] Preferably, the planetary gear is fixedly connected to the first rotating shaft, and the sun gear is fixedly connected to the second rotating shaft.

[0013] Preferably, the inner circumferential side surfaces of the first base and the second base are both rotatably engaged with sealing disks, and the first rotating shaft and the second rotating shaft are both rotatably engaged with the two sealing disks.

[0014] Preferably, a drive motor is fixedly mounted on the frame, an output end of the drive motor is connected to a reducer fixedly mounted on the frame, an output end of the reducer is fixedly connected to a transmission shaft, the transmission shaft is fixedly connected to the sun gear, and the transmission shaft is rotatably fitted through the first base.

[0015] Preferably, the mixing drum comprises an inner drum wall and an outer drum wall, an interlayer is formed between the inner drum wall and the outer drum wall, and an electric heating tube is fixedly installed in the interlayer.

[0016] Preferably, a discharge port and two feed ports are fixedly installed on the side surface of the mixing drum.

[0017] (3) Beneficial effects

[0018] The present invention provides a device for producing a nano-foaming soil conservation agent for mine restoration, which has the following features:

[0019] Beneficial effects:

[0020] This nano-foaming soil conservation agent production device for mine remediation forms a composite flow field of axial circulation flow and radial shear flow in the mixing drum through the reverse coordinated rotation of the main stirring element and the sub-stirring element, covering the entire area of the drum without dead corners. The stirring paddle of the main stirring element pushes the material to circulate up and down, and the elastic scraper of the sub-stirring element cooperates with the trapezoidal retention block to scrape the drum wall and directional push the solid particles, ensuring uniform mixing of solid raw materials and liquid raw materials, and solving the problem of uneven dispersion of traditional stirring equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A perspective view of the present invention;

[0022] Figure 2 This is a three-dimensional diagram of a mixing drum cut away from the present invention;

[0023] Figure 3 It is a structural schematic diagram of the stirring assembly of the present invention;

[0024] Figure 4 is a schematic cross-sectional view of a transmission component of the present invention;

[0025] Figure 5 It is a three-dimensional diagram of the gear transmission system of the present invention.

[0026] Among them, 1. frame; 2. mixing drum; 3. mixing assembly; 4. transmission parts; 5. main stirring element; 6. sub-stirring element; 7. first rotating shaft; 8. elastic scraper; 9. trapezoidal retention block; 10. second rotating shaft; 11. stirring paddle; 12. first base; 13. second base; 14. ring gear; 15. planetary gear; 16. sun gear; 17. sealing disk; 18. driving motor; 19. reducer; 20. transmission shaft; 21. inner cylinder wall; 22. outer cylinder wall; 23. electric heating tube; 24. discharge port; 25. feed port. DETAILED DESCRIPTION

[0027] 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.

[0028] Examples, such as Figure 1 - Figure 5 As shown, an embodiment of the present invention provides a production device for a nano-foamed soil nutrient agent for mine remediation, comprising a frame 1, a mixing drum 2 fixedly mounted on the frame 1, a mixing assembly 3 fixedly mounted inside the mixing drum 2, the mixing assembly 3 comprising a transmission component 4, a main stirring element 5, and a plurality of sub-stirring elements 6, the plurality of sub-stirring elements 6 surrounding the main stirring element 5 and uniformly distributed circumferentially. Conventional single-axis stirring equipment only drives the blades to rotate through the central axis, forming a "vortex-shaped" single flow field centered on the axis, resulting in a high material retention rate near the drum wall. However, the present device forms a complex flow field within the drum through the synergistic effect of the main stirring element 5 and the sub-stirring elements 6. The main stirring element 5 is located in the center, and the sub-stirring elements 6 are distributed circumferentially, which can cover the radial and circumferential space of the mixing drum 2 and avoid dead corners in stirring.

[0029] Specifically, the sub-stirring element 6 includes a first rotating shaft 7, and a plurality of elastic scrapers 8 are fixedly installed on the side surface of the first rotating shaft 7 in a circumferential array. The outer edge of the elastic scraper 8 is in contact with the inner wall of the mixing drum 2, and the two sides of the elastic scraper 8 are fixedly connected with a plurality of trapezoidal retention blocks 9 in a linear array. The two adjacent trapezoidal retention blocks 9 are symmetrically arranged. The first rotating shaft 7 serves as a power transmission component of the sub-stirring element 6 to drive the elastic scraper 8 to move. The elastic scraper 8 is made of flexible materials such as silicone and rubber. The outer edge of the elastic scraper is in contact with the drum wall to remove the material attached to the inner wall and avoid the residual raw materials affecting the mixing uniformity; the elastic property can buffer the contact with the drum wall, reduce mechanical wear, and the trapezoidal retention blocks 9 are symmetrically arranged. The trapezoidal structure of the retention block 9 can hinder the flow of solid particles on the elastic scraper 8, and cooperate with the rotating centrifugal force to retain the undissolved solid raw materials on the scraper surface, and then push the raw materials toward the main stirring piece 5 through the symmetrically arranged inclined surfaces, thereby extending the residence time of the raw materials in the central stirring area. Compared with the existing unidirectional rotating scraper that can only passively scrape off the materials attached to the cylinder wall and cannot guide the solid flow to the central area (it is easy to be thrown to the cylinder wall or circumferentially retained due to centrifugal force, and high-viscosity materials accumulate on the scraper), this device uses the integrated design of "scraping-retention-directional conveying" to extend the average residence time of the raw materials in the central stirring area, thereby significantly enhancing the mixing effect.

[0030] The main stirring element 5 includes a second rotating shaft 10, and a stirring paddle 11 is fixedly installed on the side surface of the second rotating shaft 10. The stirring paddle 11 is driven to rotate by the second rotating shaft 10. When the stirring paddle 11 rotates, axial and radial material flow is generated, forming a reverse shear force with the elastic scraper 8 of the sub-stirring element 6, promoting convective mixing and dispersion of the material, which is particularly suitable for systems with high viscosity or containing solid particles.

[0031] Specifically, the transmission component 4 includes a first base 12 and a second base 13 fixedly mounted on the two inner side surfaces of the mixing drum 2. A ring gear 14 is fixedly mounted on the inner circumferential side surface of the first base 12. A plurality of planetary gears 15 are meshed with each other in the ring gear 14. The plurality of planetary gears 15 are arranged in a circumferential array. A sun gear 16 is meshed with each other among the plurality of planetary gears 15. The planetary gears 15 are fixedly connected to the first rotating shaft 7, and the sun gear 16 is fixedly connected to the second rotating shaft 10. In this gear transmission system, the ring gear 14 serves as a fixed part and cooperates with the sun gear 16 to provide rotational support for the planetary gears 15. The ring gear 14 and the planetary gears 15 are internally meshed to transmit the planetary gears 15, so that the planetary gears 15 rotate around their own axes and revolve around the sun gear 16.

[0032] The main stirring element 5 and the sub-stirring element 6 achieve counter-coordinated rotation through the planetary gear system of the transmission component 4: the sun gear 16 is fixedly connected to the second rotating shaft 10, driving the stirring paddle 11 of the main stirring element 5 to rotate, generating axial (up and down circulation) and radial (radiation diffusion) material flow; the planetary gear 15 is linked with the first rotating shaft 7, driving the elastic scraper 8 of the sub-stirring element 6 to perform a "rotation + revolution" compound motion, and the rotation direction is opposite to that of the main stirring element 5. This reverse rotation mechanism forms a multi-dimensional shear force field in the barrel: the stirring paddle 11 promotes the axial circulation of the material, and the elastic scraper 8 generates radial shear near the barrel wall. The material is subjected to high-intensity shear when passing through the gap between the two, effectively breaking up nanomaterial agglomerates and promoting convective mixing of high-viscosity materials and solid particles. Compared with traditional co-directional stirring equipment, the mixing uniformity is effectively improved;

[0033] The linear array of trapezoidal retention blocks 9 on the surface of the elastic scraper 8 presents a symmetrically inclined structure, utilizing rotating centrifugal force to achieve the retention and directional transport of solid raw materials: When the sub-stirring element 6 rotates, undissolved solid particles (such as humic acid powder and water-retaining agent particles) are thrown toward the scraper surface due to centrifugal force. The trapezoidal retention blocks 9 prevent the solid particles from escaping the elastic scraper 8, causing them to be temporarily retained in the groove. At the same time, the axial component force generated by the symmetrical inclined surface pushes the particles toward the main stirring element 5, causing them to migrate from the cylinder wall to the central high-shear area. This design completely solves the problem of existing one-way scrapers that can only passively scrape material and cannot guide the particles to the center, prolonging the average residence time of the raw materials in the central stirring zone and significantly improving the efficiency and uniformity of solid-liquid mixing.

[0034] The inner circumferential sides of the first base 12 and the second base 13 are both rotatably engaged with sealing disks 17, and the first rotating shaft 7 and the second rotating shaft 10 are both rotatably engaged with the two sealing disks 17. A dynamic seal is formed between the sealing disk 17 and the first rotating shaft 7 and the second rotating shaft 10 to prevent the material in the mixing drum 2 from leaking to the transmission component 4 area, and at the same time prevent external impurities from entering the drum and contaminating the product.

[0035] A drive motor 18 is fixedly installed on the frame 1, and the output end of the drive motor 18 is connected to a reducer 19 fixedly installed on the frame 1. The output end of the reducer 19 is fixedly connected to a transmission shaft 20, which is fixedly connected to the sun gear 16. The transmission shaft 20 rotates through the first base 12. The drive motor 18 provides the power required for stirring. Usually, a three-phase asynchronous motor or a servo motor is selected. The speed is adjusted according to the material characteristics. The reducer 19 reduces the motor output speed and increases the torque to ensure that the main stirring element 5 and the sub-stirring element 6 run at a suitable speed. The transmission shaft 20 transmits torque to the sun gear 16. It is made of high-strength alloy steel and needs to be dynamically balanced to avoid vibration during high-speed rotation.

[0036] The mixing drum 2 includes an inner drum wall 21 and an outer drum wall 22. A sandwich is formed between the inner drum wall 21 and the outer drum wall 22. An electric heating tube 23 is fixedly installed in the sandwich. A closed space is formed by the inner and outer drum walls. The electric heating tube 23 generates heat after current is passed through it. The air is used as a medium to transfer the heat to the inner drum wall 21, thereby indirectly heating the material in the drum. For example, when processing a mixture of humic acid and water, the temperature of the material can be increased by the temperature control system to reduce the viscosity of the liquid and improve the dispersion efficiency of the solid particles. When mixing heat-sensitive nanomaterials, a cooling medium can be introduced through the sandwich to achieve cooling and ensure the stability of the components.

[0037] A discharge port 24 and two feed ports 25 are fixedly installed on the sides of the mixing drum. The discharge port 24 is located in the lower middle part of the drum to facilitate the discharge of high-viscosity materials and avoid residue. The discharge port 24 can be equipped with a ball valve or a screw conveyor to control the discharge speed and prevent backflow. The two feed ports 25 can be used to deliver liquid and solid raw materials respectively to avoid premature reaction of the raw materials before mixing.

[0038] For the nano-foaming process, a foam solution feed port can be provided at the top of the mixing drum 2 and connected to an external foaming device through a pipeline. The external foaming device mixes a foaming agent (such as a surfactant solution) with gas through high-speed shear or compressed air to form a nano-foam solution. After the flow rate is controlled by a metering pump, the foam solution is injected into the mixing drum 2 through the foam solution feed port. During mixing, solid raw materials of the soil conserving agent (such as humic acid, nano-silica) and liquid raw materials (such as water, water-retaining agent solution) are first added through the feed port 25. The drive motor 18 is started to rotate the main stirring element 5 and the sub-stirring element 6 in opposite directions. The materials are initially mixed by the axial circulation flow of the stirring paddle 11 and the radial shear flow of the elastic scraper 8. Then, the foam solution feed port is opened and the pre-foamed nano-foam solution is injected into the mixing drum 2. The directional pushing and composite flow field effect of the trapezoidal retention block 9 ensure that the foam solution and the materials are fully blended. A suitable mixing time is set. During this period, the temperature in the drum is maintained by the temperature control system (electric heating tube 23) to optimize the foam stability, and finally, a soil conserving agent containing nanobubbles is formed.

[0039] Working principle: The raw materials enter the mixing drum 2 through the feed port 25, and the driving motor 18 drives the sun gear 16 to rotate through the reducer 19 and the transmission shaft 20. The planetary gear 15 revolves around the ring gear 14 and rotates at the same time, so that the first rotating shaft 7 drives the elastic scraper 8 to form a "rotation + revolution" compound motion. The stirring paddle 11 rotates synchronously with the second rotating shaft 10. The rotation of the stirring paddle 11 generates axial and radial material flow, and forms a shear flow field with the reverse motion of the elastic scraper 8; the outer edge of the elastic scraper 8 scrapes against the drum wall to remove the attachments on the inner wall, and the trapezoidal retention block 9 on its surface uses centrifugal force to retain the solid raw materials and pass through the inclined surface. It is pushed to the main stirring area. At this time, the material in the mixing drum 2 is affected in three dimensions: the axial thrust of the stirring paddle 11 forms an up and down circulation flow, the radial shear of the elastic scraper 8 forms a circumferential turbulence, and the directional push of the trapezoidal retention block 9 forms a radial convergent flow. The superposition of the three flow fields makes the material experience a "lifting-shearing-convergence" circulation path in the mixing drum 2, which significantly improves the efficiency compared with the single circulation path of traditional equipment. The electric heating tube 23 regulates the material temperature through interlayer heating and optimizes the reaction conditions. Finally, the evenly mixed material is discharged through the discharge port 24, completing the production of nano-foaming soil conservation agent for mine remediation.

[0040] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A device for producing a nano-foamed soil conservation agent for mine restoration, comprising a frame (1), characterized in that: A mixing drum (2) is fixedly mounted on the frame (1), a mixing assembly (3) is fixedly mounted inside the mixing drum (2), the mixing assembly (3) comprising a transmission component (4), a main mixing element (5) and a plurality of sub-mixing elements (6), the plurality of sub-mixing elements (6) surrounding the main mixing element (5) and being evenly distributed around the circumference; The sub-stirring element (6) comprises a first rotating shaft (7), a plurality of elastic scrapers (8) are fixedly mounted on the circumferential side surface of the first rotating shaft (7) in a circumferential array, the outer edges of the elastic scrapers (8) are in contact with the inner wall of the mixing drum (2), and a plurality of trapezoidal retention blocks (9) are fixedly connected to both sides of the elastic scrapers (8) in a linear array, and two adjacent trapezoidal retention blocks (9) are symmetrically arranged.

2. The device for producing a nano-foamed soil nutrient agent for mine restoration according to claim 1, characterized in that: The main stirring member (5) comprises a second rotating shaft (10), and a stirring paddle (11) is fixedly mounted on the circumferential side of the second rotating shaft (10).

3. The device for producing a nano-foamed soil nutrient agent for mine restoration according to claim 2, characterized in that: The transmission component (4) comprises a first base (12) and a second base (13) fixedly mounted on the two inner side surfaces of the mixing drum (2); a gear ring (14) is fixedly mounted on the inner peripheral side surface of the first base (12); a plurality of planetary gears (15) are meshed with each other in the gear ring (14); the plurality of planetary gears (15) are arranged in a circumferential array; and a sun gear (16) is meshed with each other in the plurality of planetary gears (15).

4. The device for producing a nano-foamed soil nutrient agent for mine restoration according to claim 3, characterized in that: The planetary gear (15) is fixedly connected to the first rotating shaft (7), and the sun gear (16) is fixedly connected to the second rotating shaft (10).

5. The device for producing a nano-foamed soil nutrient agent for mine restoration according to claim 4, characterized in that: The inner circumferential side surfaces of the first base (12) and the second base (13) are both rotatably fitted with sealing disks (17), and the first rotating shaft (7) and the second rotating shaft (10) are both rotatably fitted with the two sealing disks (17).

6. The device for producing a nano-foamed soil nutrient agent for mine restoration according to claim 5, characterized in that: A driving motor (18) is fixedly mounted on the frame (1); an output end of the driving motor (18) is connected to a reducer (19) fixedly mounted on the frame (1); an output end of the reducer (19) is fixedly connected to a transmission shaft (20); the transmission shaft (20) is fixedly connected to the sun gear (16); and the transmission shaft (20) is rotatably engaged with the first base (12).

7. The device for producing a nano-foamed soil nutrient agent for mine restoration according to claim 6, characterized in that: The mixing drum (2) comprises an inner drum wall (21) and an outer drum wall (22), an interlayer is formed between the inner drum wall (21) and the outer drum wall (22), and an electric heating pipe (23) is fixedly installed in the interlayer.

8. The device for producing a nano-foamed soil nutrient agent for mine restoration according to claim 7, characterized in that: A discharge port (24) and two feed ports (25) are fixedly mounted on the side surface of the mixing drum (2).

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