Settling separation washing tank for aluminum oxide production

Abstract

The utility model discloses a settling separation washing tank for aluminum oxide production, relates to the technical field of aluminum oxide production, and innovatively adopts a cooperative buffer structure of a movable connecting piece and an elastic buffer sleeve aiming at the problem that a transmission system is easily overloaded and damaged due to traditional rigid connection. The central vertical shaft is hinged to the bottom raking machine through a movable connecting piece, and when the raking machine meets large-particle scabs or hardened objects at the bottom of the trough, the raking machine can deflect in a self-adaptive mode; the two ends of the elastic buffering sleeve arranged outside the movable connecting piece in a sleeving mode are fixedly connected with the lower end of the center vertical shaft and the raking machine base respectively, and impact energy is absorbed through self deformation. According to the design, non-uniform resistance is converted into elastic potential energy of the buffer sleeve, and impact torque transmitted to the central vertical shaft is reduced, so that the risks of motor overload jump stop and rake arm breakage are avoided, and continuous and stable operation of a sedimentation washing process is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of alumina production technology, specifically to a sedimentation separation washing tank for alumina production. Background Technology

[0002] In the alumina production process, the sedimentation and washing tank plays a crucial role in the solid-liquid separation and washing of red mud slurry. Its core component, the bottom rake, is driven by a central vertical shaft to continuously scrape and collect the precipitated solids at the bottom of the tank and transport them to the slag discharge port.

[0003] In traditional structures, the central vertical shaft and the rake are rigidly connected directly using flange bolts. When there are large particles of scale or material caking at the bottom of the tank, the rake is subjected to non-uniform resistance, and the transmission system is subjected to impact torque. This can lead to motor overload and shutdown, or even rake arm deformation and breakage. To address this, we propose a sedimentation separation washing tank for alumina production. Utility Model Content

[0004] The purpose of this invention is to provide a sedimentation separation washing tank for alumina production, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a sedimentation separation washing tank for alumina production, comprising a tank body, a drive motor, a central vertical shaft, and a bottom rake; the central vertical shaft and the rake are hinged together by a movable connector; an elastic buffer sleeve is fitted outside the movable connector, and the two ends of the elastic buffer sleeve are respectively fixedly connected to the lower end of the central vertical shaft and the base of the rake.

[0006] Preferably, the two ends of the elastic buffer sleeve are fixedly connected to the lower end of the central vertical shaft and the base of the rake machine via flanges.

[0007] Preferably, the movable connecting component is a universal coupling.

[0008] Preferably, the elastic buffer sleeve is a corrugated tubular rubber sleeve, and its inner wall is clearance-fitted with the movable connecting part.

[0009] Preferably, the bottom of the rake is fixedly equipped with an anti-settlement scraper, which has a trapezoidal structure and an acute angle between its inclined surface and the horizontal plane; a gap is reserved between the two ends of the scraper and the side wall of the trough; and a tungsten carbide wear-resistant layer is overlaid on the cutting edge of the scraper.

[0010] Preferably, the scraper is provided with an array of guide grooves distributed along the length of the scraper, with the two ends of the guide grooves extending to the inclined surface of the scraper and the back flow side of the scraper, respectively.

[0011] Preferably, the guide channel is trapezoidal in cross-section along the width of the scraper, and the bottom surface of the guide channel gradually slopes upward from the inclined surface of the scraper.

[0012] Preferably, the flange has radially distributed annular guide ribs on the side facing the bottom of the tank.

[0013] Compared with traditional technologies, the beneficial effects of this utility model are:

[0014] This device effectively mitigates the non-uniform resistance caused by large particles or caking materials at the bottom of the trough through the coordinated operation of the movable connector and the elastic buffer sleeve. When the rake encounters a localized impact load, the movable connector provides multi-directional freedom, allowing the rake to adaptively deflect; simultaneously, the externally fitted elastic buffer sleeve converts the instantaneous impact force into sleeve deformation energy, significantly reducing the impact torque transmitted to the central vertical axis. This dual buffering mechanism fundamentally avoids the risk of transmission system overload caused by traditional rigid connections, greatly reduces the probability of motor shutdown and rake arm deformation and breakage, and ensures continuous and stable operation of the equipment.

[0015] The trapezoidal anti-settling scraper, combined with the tungsten carbide wear-resistant layer on the cutting edge and the gap design, significantly improves anti-caking ability and wear life. The sharp-angled bevel of the scraper can cut into the caking material layer, and the trapezoidal structure enhances bending strength; the reserved gaps at both ends prevent the scraper from hardly colliding with the tank wall; the tungsten carbide weld overlay resists the abrasion of high-hardness red mud. The three elements work together to ensure that the scraper can continuously and efficiently scrape away precipitated solids under harsh working conditions. Especially when the movable connecting parts drive the rake to adaptively deflect, the scraper can still maintain a stable scraping trajectory through gap adjustment, fundamentally reducing equipment damage caused by sudden changes in resistance.

[0016] The radial guide ribs at the bottom of the flange create a centrifugal flow field during rotation, preventing solid particles from depositing at the bottom of the flange. The trapezoidal guide channels arrayed above the scraper connect the inclined surface and the backflow side; their sloping bottom guides the liquid upwards, disrupting the negative pressure zone behind the scraper and reducing secondary settling. This design, while protecting the equipment with a buffer mechanism, further enhances the efficiency of slurry solid phase transport and the washing liquid replacement effect, achieving a dual improvement in separation and washing performance. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the internal structure of the housing of this utility model;

[0019] Figure 3 This is a schematic diagram of the rake mechanism of this utility model;

[0020] Figure 4 This is a schematic diagram of the flange portion of this utility model;

[0021] Figure 5 This is a cross-sectional view of the flow channel section of this utility model.

[0022] In the diagram: 1-Tank body; 2-Drive motor; 3-Central vertical shaft; 4-Rake; 5-Modible connector; 6-Elastic buffer sleeve; 7-Flange; 8-Scraper; 9-Guide channel; 10-Guide rib. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Example 1:

[0025] Please see Figures 1-5 The diagram shows a sedimentation and washing tank for alumina production, comprising a tank body 1, a drive motor 2, a central vertical shaft 3, and a bottom rake 4. The central vertical shaft 3 and the rake 4 are hinged together by a movable connector 5, forming a flexible hinge that allows the rake 4 to adapt to multi-directional deflection when encountering large particles or caking at the bottom of the tank. An elastic buffer sleeve 6 is fitted over the movable connector 5, with its two ends fixedly connected to the lower end of the central vertical shaft 3 and the base of the rake 4, respectively. The elastic buffer sleeve 6 absorbs impact energy through its own deformation, converting instantaneous impact torque into elastic potential energy, significantly reducing the peak load transmitted to the central vertical shaft 3. This dual mechanism fundamentally avoids the overload risk of the transmission system caused by traditional rigid direct connection, ensuring continuous and stable operation of the drive motor 2 under complex working conditions.

[0026] The following describes some embodiments of this application in detail with reference to the accompanying drawings:

[0027] Please see Figures 1-4 Through the coordinated operation of the movable connector 5 and the elastic buffer sleeve 6, the non-uniform resistance generated by large particles of scale or caking material at the bottom of the trough is effectively mitigated. When the rake 4 encounters a local impact load, the movable connector 5 provides multi-directional degrees of freedom, allowing the rake 4 to produce adaptive deflection; at the same time, the externally fitted elastic buffer sleeve 6 converts the instantaneous impact force into sleeve deformation energy, significantly weakening the impact torque transmitted to the central vertical shaft 3. This dual buffer mechanism fundamentally avoids the risk of transmission system overload caused by traditional rigid connections, greatly reduces the probability of motor shutdown and rake arm deformation and breakage, and ensures continuous and stable operation of the equipment.

[0028] The elastic buffer sleeve 6 is fixedly connected to the lower end of the central vertical shaft 3 and the base of the rake 4 at both ends via flanges 7. The introduction of flanges 7 enables reliable sealing and dynamic compensation of the buffer assembly. Its rigid connection characteristics ensure a stable connection between the two ends of the elastic buffer sleeve 6 and the central vertical shaft 3 and the base of the rake 4, preventing slurry from seeping into the active connection area. At the same time, radially distributed guide ribs 10 are provided on the side of the flange 7 facing the bottom of the tank. The radially distributed guide ribs 10 disturb the fluid during rotation, forming a centrifugal guide field, which effectively prevents solid particles from depositing around the connection structure and avoids secondary impact caused by increased resistance due to material accumulation.

[0029] In addition, the elastic buffer sleeve 6 is a corrugated tubular rubber sleeve, and its inner wall is clearance-fitted with the movable connecting part 5. The corrugated structure enhances the axial / radial deformation capability and efficiently dissipates impact energy. The rubber material is corrosion-resistant and its elastic modulus matches the working conditions. The gap between the inner wall of the sleeve and the universal coupling not only ensures the free deflection space of the coupling, but also forms a physical isolation barrier to completely isolate the high alkalinity slurry from corroding the precision moving parts.

[0030] It is worth noting that the movable connector 5 is a universal joint, providing full-degree-of-freedom deflection capability: the cross-shaft structure of the universal joint allows the rake 4 to adaptively adjust its angle in any direction, instantly releasing stress when the scraper 8 encounters a sudden change in local resistance, while maintaining continuous torque transmission. Compared to ordinary hinges, the universal joint structure is more adaptable to scenarios with non-uniform resistance distribution in settling tanks, improving the system's impact resistance robustness.

[0031] In this technical solution, the bottom of the rake 4 is fixedly equipped with an anti-settlement scraper 8. The scraper 8 has a trapezoidal structure, with its inclined surface forming an acute angle with the horizontal plane. The acute angled inclined surface wedges in to break up the slab-like material layer, and the trapezoidal cross-section improves the bending stiffness. A gap is reserved between the two ends of the scraper 8 and the side wall of the tank 1, allowing the scraper 8 to avoid rigid collision with the tank wall when deflecting, while maintaining the continuity of the scraping trajectory. The cutting edge of the scraper 8 is overlaid with a tungsten carbide wear-resistant layer to resist the abrasion of hard particles in the red mud and extend the service life of the scraper 8. The three elements work together to ensure that, under the protection of the impact buffer mechanism, the precipitated solids are continuously and efficiently guided to the slag discharge port.

[0032] The working principle of this device is as follows:

[0033] The drive motor 2 (with a reducer) drives the central vertical shaft 3 to rotate, and transmits torque to the bottom rake 4 through the movable connector 5 (universal coupling). When the rake 4 scrapes the red mud at the bottom of the trough, if it encounters large particles of crust or hardened areas, the non-uniform resistance forces the rake 4 to deflect. At this time, the ball joint structure of the universal coupling provides multi-directional freedom, allowing the rake 4 to tilt adaptively. At the same time, the elastic buffer sleeve 6 (corrugated tubular rubber sleeve) sleeved outside the coupling undergoes radial or axial deformation, converting the impact kinetic energy into rubber elastic potential energy, reducing the peak torque transmitted to the central vertical shaft 3, and avoiding motor overload or rake arm breakage.

[0034] The trapezoidal anti-settlement scraper 8 at the bottom of the rake 4 wedges into the slab-formed material layer with an acute angled slope to break up the solid phase deposits; the tungsten carbide wear-resistant layer on the cutting edge resists the wear of hard red mud particles; the gap between the two ends of the scraper 8 and the trough wall allows for avoidance of interference when deflecting.

[0035] When the flange 7 of the fixed buffer sleeve rotates, the radial guide ribs 10 at its bottom disturb the fluid to form a centrifugal flow field, throwing solid particles away from the bottom area of ​​the flange 7; at the same time, the gaps between the guide ribs 10 guide the slurry to flow tangentially along the ribs, preventing material from accumulating in the flange groove.

[0036] Example 2:

[0037] This embodiment is an optimization of the structure in Embodiment 1. Specifically, as follows: Figure 3 and Figure 5 As shown, an array of guide channels 9 are arranged above the scraper 8 along its length. The two ends of the guide channels 9 extend to the inclined surface of the scraper 8 and the backflow side of the scraper 8, respectively. This array of guide channels 9 creates a micro-circulation channel for the slurry. The design of connecting the inclined surface and the backflow side of the scraper 8 allows the washing liquid to penetrate into the material layer through the pores of the inclined surface as the scraper 8 advances, and then overflow upwards from the guide channels 9 on the backflow side. This process disrupts the negative pressure zone behind the scraper 8, reducing secondary sedimentation, and simultaneously enhances the replacement efficiency between solid particles and the washing liquid, significantly improving the red mud washing effect.

[0038] Furthermore, the guide channel 9 is trapezoidal in cross-section along the width of the scraper 8, and the bottom surface of the guide channel 9 gradually slopes upward from the inclined surface of the scraper 8, further optimizing the fluid dynamics behavior. When the scraper 8 advances, this structure accelerates the directional flow of liquid from the inclined surface of the high-pressure zone to the back flow side of the low-pressure zone, enhancing the penetrating and scouring force on the material layer and effectively preventing the guide channel 9 from clogging itself.

[0039] It should be noted that, in this document, relational terms such as "first" and "second" are used only 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 those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.

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

Claims

1. A sedimentation separation washing tank for alumina production, comprising a tank body (1), a drive motor (2), a central vertical shaft (3), and a bottom rake (4); Its features are: The central vertical shaft (3) and the rake (4) are hinged together by a movable connector (5); The movable connector (5) is fitted with an elastic buffer sleeve (6), and the two ends of the elastic buffer sleeve (6) are respectively fixedly connected to the lower end of the central vertical shaft (3) and the base of the rake (4).

2. The settling and separation washing tank for alumina production according to claim 1, characterized in that: The elastic buffer sleeve (6) is fixedly connected at both ends to the lower end of the central vertical shaft (3) and the base of the rake (4) via flanges (7).

3. The settling and separation washing tank for alumina production according to claim 1, characterized in that: The movable connector (5) is a universal coupling.

4. The settling and separation washing tank for alumina production according to claim 2, characterized in that: The elastic buffer sleeve (6) is a corrugated tubular rubber sleeve, and its inner wall is in clearance fit with the movable connector (5).

5. A settling and separation washing tank for alumina production according to claim 1, characterized in that: The bottom of the rake (4) is fixedly provided with an anti-settlement scraper (8). The scraper (8) has a trapezoidal structure and its inclined surface forms an acute angle with the horizontal plane. A gap is reserved between the two ends of the scraper (8) and the side wall of the trough (1). The cutting edge of the scraper (8) is overlaid with a tungsten carbide wear-resistant layer.

6. The settling and separation washing tank for alumina production according to claim 5, characterized in that: Above the scraper (8) are arranged a series of guide grooves (9) distributed along the length of the scraper (8), with the two ends of the guide grooves (9) extending to the inclined surface of the scraper (8) and the back flow side of the scraper (8) respectively.

7. A settling and separation washing tank for alumina production according to claim 6, characterized in that: The guide groove (9) is trapezoidal in cross-section of the width direction of the scraper (8), and the bottom surface of the guide groove (9) gradually slopes upward from the inclined surface of the scraper (8).

8. A settling and separation washing tank for alumina production according to claim 2, characterized in that: The flange (7) is provided with radially distributed annular guide ribs (10) on the side facing the bottom of the tank.

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