A flotation cell agitator and method of use thereof

Abstract

The application discloses a flotation machine stirring device and a use method thereof, and belongs to the technical field of flotation machines.The flotation machine stirring device comprises, from top to bottom, a driving mechanism, a shaft coupling, a bearing seat and a stirring mechanism.The driving mechanism is connected with a rotating shaft through the shaft coupling.The outer side of the rotating shaft is provided with the bearing seat.The lower side of the bearing seat is provided with the stirring mechanism.The driving mechanism, the shaft coupling, the rotating shaft, the bearing seat and the stirring mechanism are sequentially arranged in an integrated mode from top to bottom, so that the axial space of the whole machine is highly compacted, and the problems of large occupied area and complex structure of the traditional flotation machine stirring device caused by the external bearing seat and the series connection of the multi-groove and multi-driving device are solved.

Description

Technical Field

[0001] This invention belongs to the field of flotation machine technology, and particularly relates to a flotation machine stirring device and its usage method. Background Technology

[0002] With the continuous extension of mining life and the widespread implementation of integrated mechanized coal mining technology in my country, the content of high-ash fine particulate matter in raw coal has increased significantly, coal slime particles have become increasingly finer, and a large amount of gangue minerals have been mixed into the coal slurry, resulting in increased ash content and significantly reduced floatability of the flotation material. For ultrafine coal particles with a diameter of less than 50 micrometers, due to their weak inertia and low momentum, the probability of collision with air bubbles is low, making it difficult to adhere effectively. At the same time, high-ash clay minerals easily form a coating layer on the surface of coal particles, further inhibiting flotation selectivity and causing prominent problems such as excessive ash content and low recovery rate of clean coal, which has become the core bottleneck restricting the efficient operation of the flotation system.

[0003] In the field of coal slime flotation, mechanically agitated flotation machines are widely used. Conventional mechanically agitated flotation machines typically employ a single-stage, multi-tank series structure, utilizing agitator impellers to suspend and circulate the slurry, and introducing air and flotation reagents via air intake and reagent dosing devices near the central shaft. However, when processing coal slurries with high ash and fine mud content and poor floatability, this type of equipment reveals the following significant drawbacks: Firstly, the transmission efficiency is low and the energy consumption is high. Most existing mechanical stirring flotation machines drive the stirring shaft through pulley (belt) transmission. Belt drives are prone to slippage and energy loss, which limits the transmission efficiency. In addition, the multi-tank series arrangement usually requires each sorting tank to be equipped with an independent motor, resulting in a large total installed power and high operating energy consumption.

[0004] Secondly, the multi-slot, multi-drive device and external bearing housing result in a complex structure and a large footprint. The bearing housing of traditional mixing devices is generally installed outside the sorting tank, requiring additional support frames and sealing structures. At the same time, the multi-slot shaft system makes the whole machine bulky and occupies a large area. Moreover, the complex shaft system structure is not conducive to stable energy transmission and compact layout of the whole machine.

[0005] Third, uneven mixing of the slurry creates dead zones. In multi-tank series feeding methods, the slurry flow path is limited, especially in the feed channel and the edge area of ​​the tank. The conventional blade stirring range is insufficient, which easily forms dead zones. Some slurry cannot be fully mixed, suspended, and effectively contacted with air bubbles, directly affecting the flotation effect.

[0006] Fourth, the reagent and bubble dispersion effect is poor, and the ability to strip clay minerals from the surface of coal particles is insufficient. Usually, the reagent inlet and air inlet are integrated near the central shaft or tank wall. The traditional central shaft blade structure has limited shear and dispersion strength for reagents and bubbles, making it difficult to disperse the reagents and form microbubbles that are evenly mixed in the slurry. At the same time, the shearing effect on the slurry is insufficient, and it is impossible to effectively strip the high-ash clay minerals covering the surface of coal particles. As a result, the hydrophobicity of coal particles is difficult to recover, the flotation selectivity is poor, and the ash content of clean coal is difficult to reduce.

[0007] Fifth, it has a weak ability to withstand fluctuations in incoming materials. When parameters such as the concentration, flow rate, or ash content of the feed slurry change suddenly, conventional flotation machines, due to their limited stirring and mixing capabilities, cannot quickly adjust the slurry to a uniform and stable state, resulting in large fluctuations in the flotation process and unstable quality of the clean coal product.

[0008] The aforementioned defects severely restrict the efficient separation of high-ash, fine-particle, and difficult-to-float coal slime. There is an urgent need to develop a mixing device that can achieve dead-angle slurry preparation, efficient dispersion of reagents and air bubbles, and effective stripping of clay minerals from the surface of coal particles, while also possessing features such as compact structure, high transmission efficiency, and strong anti-fluctuation capability. Summary of the Invention

[0009] Based on the technical problems existing in the prior art, the present invention provides a flotation machine stirring device and its usage method.

[0010] According to a first aspect of the technical solution of the present invention, a flotation machine stirring device is provided, comprising a drive mechanism, a coupling, a bearing seat, and a stirring mechanism arranged sequentially from top to bottom. The drive mechanism is connected to a rotating shaft via the coupling. A bearing seat is provided on the outer side of the rotating shaft, and a stirring mechanism is provided below the bearing seat. The drive mechanism is used to drive the rotating shaft. The coupling is used to connect the drive mechanism and the rotating shaft and transmit torque. The bearing seat is used to support and protect the rotating shaft. The stirring mechanism is used to shear and mix the slurry, reagents, and bubbles during rotation.

[0011] A further improvement of the present invention is that the drive mechanism includes a variable frequency motor and a motor support, the variable frequency motor is provided above the motor support, and the motor support is disposed between the variable frequency motor and the coupling.

[0012] A further improvement of the present invention is that: the bearing housing includes an outer cylinder, a bearing housing, a bearing, and a bearing base plate; the bearing housing is disposed on the outside of the rotating shaft; a bearing is provided between the bearing housing and the rotating shaft; a bearing base plate is provided between the stirring mechanism and the bearing housing; an outer cylinder is disposed above the bearing base plate; and the outer cylinder is sleeved on the outside of the bearing housing.

[0013] A further improvement of the present invention is that the stirring mechanism includes a guide plate, a stirring shaft and hollow blades, the stirring shaft cooperates with the rotating shaft, the upper part of the stirring shaft is provided with a guide plate, and the lower part of the stirring shaft is provided with a plurality of hollow blades.

[0014] A further improvement of the present invention is that the bearing housing and the bearing base plate are sealed together by an O-ring.

[0015] A further improvement of the present invention is that a lip seal ring is provided between the base plate of the bearing seat and the rotating shaft, and the lip seal ring is located below the base plate of the bearing seat.

[0016] A further improvement of the present invention is that: the guide plate is a disk with a through hole in the center, and the outer diameter of the guide plate is greater than or equal to the outer diameter of the hollow blade.

[0017] A further improvement of the present invention is that: the hollow blades are provided in several layers from top to bottom, and there is a gap between two adjacent layers of hollow blades.

[0018] A further improvement of the present invention is that the hollow blades in each layer are arranged radially with respect to the stirring shaft.

[0019] According to a second aspect of the technical solution of the present invention, a method for using a flotation machine stirring device is provided, which is based on the above-mentioned flotation machine stirring device and includes the following steps: Step S1: Immerse the bearing housing and stirring mechanism into the separation tank of the flotation machine so that the bearing housing and stirring mechanism come into contact with the slurry; Step S2: Start the drive mechanism, which transmits torque to the rotating shaft through a coupling, driving the rotating shaft to rotate; Step S3: The rotating shaft transmits power to the stirring mechanism, causing the stirring mechanism to rotate; Step S4: During the rotation process, the stirring mechanism simultaneously shears and mixes the slurry, reagents, and bubbles.

[0020] Compared with the prior art, the above-mentioned technical solution of the present invention has the following beneficial technical effects: 1. This invention achieves a highly compact axial space for the entire machine by integrating the drive mechanism, coupling, rotating shaft, bearing housing, and stirring mechanism sequentially from top to bottom. This solves the problem of large footprint and complex structure in traditional flotation machine stirring devices due to external bearing housings and multiple tanks connected in series. Simultaneously, the drive mechanism directly drives the rotating shaft via the coupling, eliminating the pulley transmission link, improving transmission efficiency, and significantly reducing operating energy consumption.

[0021] 2. This invention achieves independent installation and support of the drive unit by setting the drive mechanism as a modular structure consisting of a variable frequency motor and a motor support, and placing the motor support between the variable frequency motor and the coupling. This structure solves the problem of inconvenient adjustment of the rigid connection between the drive unit and the mixing body in traditional devices, allowing the axial height and radial coaxiality of the variable frequency motor to be adjusted according to on-site needs, thus improving the assembly adaptability and operational stability of the device during maintenance.

[0022] 3. This invention designs the bearing housing as an immersion structure consisting of an outer cylinder, a bearing housing shell, a bearing, and a bearing housing base plate. The bearing housing shell is fitted onto the outside of the rotating shaft and supported by the bearing. The outer cylinder is fitted onto the outside of the bearing housing shell and fixed above the bearing housing base plate, enabling the entire bearing housing to be immersed in slurry. This structure solves the problems of large space occupation and long shaft cantilever of traditional external bearing housings, saving space while providing stable support for the rotating shaft and ensuring smooth power transmission.

[0023] 4. This invention achieves zoned processing of the slurry by configuring the stirring mechanism as a structure consisting of a guide plate, a stirring shaft, and perforated blades. The stirring shaft cooperates with the rotating shaft to transmit power. The guide plate is set at the top, and several perforated blades are set at the bottom. The guide plate divides the upper area into a relatively stable static sorting zone, preventing the clean coal particles on the mineralization bubbles from falling off; the perforated blades at the bottom form a strong turbulent stirring zone, ensuring sufficient shear mixing and contact between the reagents, bubbles, and slurry.

[0024] 5. This invention achieves a reliable static seal in the bearing space inside the immersion bearing housing by using an O-ring seal between the bearing housing housing and the bearing base plate. This structure solves the problem of fine particles and moisture in the slurry seeping into the bearing cavity along the mating gaps, leading to bearing lubrication failure and corrosion wear. It effectively isolates the external slurry environment, extends the service life of the bearing, and ensures the long-term stable operation of the mixing device in the slurry.

[0025] 6. This invention achieves dynamic sealing and isolation between the rotating shaft and the external slurry by setting a lip seal between the shaft base plate and the rotating shaft, and installing the lip seal below the shaft base plate. This structure solves the problem of slurry leaking upwards along the shaft surface into the bearing housing during rotation, and compensates for the inadequacy of static sealing alone in addressing the sealing of the rotating interface, ensuring that the submersible bearing housing maintains good sealing and protection performance under rotating conditions.

[0026] 7. This invention achieves effective zoning of the radial cross-section of the sorting tank by designing the guide plate as a disc with a central through hole and ensuring its outer diameter is greater than or equal to the outer diameter of the perforated blades. This structure solves the problem of the strong turbulence in the lower part of the tank moving upwards and disturbing the stability of the upper sorting layer and foam layer during stirring. The edge of the guide plate extends beyond the outer diameter of the blades to form a physical barrier, allowing the slurry to flow radially and orderly through the guide plate, maintaining the stability of the sorting layer and foam layer in the upper static sorting zone while ensuring slurry circulation.

[0027] 8. This invention achieves multi-layer shearing and grading of the slurry within the mixing area by setting the perforated blades in several layers from top to bottom and leaving gaps between adjacent layers. This structure solves the problems of limited action range of single-layer mixing blades and insufficient axial mixing of the slurry. The slurry is sheared and dispersed as it passes through each layer of blades, and the gaps between layers allow the slurry to generate axial exchange flow between the blades, thereby eliminating dead zones in the mixing and achieving uniform slurry conditioning throughout the entire tank without dead angles.

[0028] 9. This invention achieves complete coverage of the feed channel and simultaneous strong shearing of the slurry, reagents, and bubbles by arranging each layer of perforated blades radially with the stirring shaft. This structure solves the problems of insufficient coverage area, limited slurry volume, and poor local mixing effect of traditional blades. The radially arranged perforated blades repeatedly cut the passing slurry during rotation, simultaneously dispersing reagents into uniform micro-droplets, shearing bubbles into uniform microbubbles, and using strong shearing force to peel away clay minerals from the surface of coal particles, significantly improving the flotation effect.

[0029] 10. This invention achieves integrated and efficient operation of the flotation stirring process by sequentially executing the steps of immersion in the bearing housing and stirring mechanism, starting the drive mechanism to directly transmit torque to the rotating shaft via a coupling, the rotating shaft driving the stirring mechanism to rotate, and the stirring mechanism synchronously shearing and mixing the slurry, reagents, and bubbles. This method solves the problems of cumbersome, high transmission energy consumption, and low energy transfer efficiency of traditional multi-cell series multi-cell driven stirring processes. The entire operation process is simple and coherent, with a single motor drive completing all processes from power input to all-round stirring and mixing, significantly improving the flotation rate and stability. Attached Figure Description

[0030] The accompanying drawings are provided to better understand the invention and are not intended to unduly limit the scope of the invention. Wherein: Figure 1 This is a schematic diagram of the structure of a flotation machine stirring device according to the present invention; Figure 2 This is a schematic diagram of the structure of a flotation machine stirring device installed inside the flotation machine according to the present invention.

[0031] In the diagram: 1-Drive mechanism; 2-Coupling; 3-Rotating shaft; 4-Bearing housing; 5-Agitating mechanism; 101-Variable frequency motor; 102-Motor support; 401-Outer cylinder; 402-Shaft housing; 403-Bearing; 404-O-ring seal; 405-Shaft base plate; 406-Lip seal; 501-Guide plate; 502-Agitating shaft; 503-Hollow blade. Detailed Implementation

[0032] The following description, in conjunction with the accompanying drawings, illustrates exemplary embodiments of the present invention, including various details to aid understanding. These details should be considered merely exemplary. Therefore, those skilled in the art will recognize that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the invention. Similarly, for clarity and brevity, descriptions of well-known functions and structures are omitted in the following description.

[0033] This invention discloses a flotation machine stirring device and its usage method, belonging to the field of flotation machine technology. The flotation machine stirring device includes a drive mechanism, a coupling, a bearing housing, and a stirring mechanism arranged sequentially from top to bottom. The drive mechanism is connected to a rotating shaft via the coupling. A bearing housing is located on the outer side of the rotating shaft, and the stirring mechanism is located below the bearing housing. This invention achieves a highly compact axial space for the entire machine by integrating the drive mechanism, coupling, rotating shaft, bearing housing, and stirring mechanism sequentially from top to bottom. This solves the problem of large footprint and complex structure caused by external bearing housings and multiple series-connected drive devices in traditional flotation machine stirring devices. Simultaneously, the drive mechanism directly drives the rotating shaft via the coupling, eliminating the pulley transmission link, significantly improving transmission efficiency and reducing operating energy consumption. The multi-layered radially perforated blades of the stirring mechanism can strongly shear bubbles, reagents, and slurry, solving the problem that traditional flotation machines rely on centrifugal force to suck in and break bubbles, failing to achieve strong shearing of microbubbles.

[0034] The technical solution of the flotation machine stirring device and its usage method of the present invention will be described in detail below with reference to the embodiments and accompanying drawings.

[0035] Example 1 like Figure 1-2As shown in the figure, this embodiment provides a flotation machine stirring device, which includes a drive mechanism 1, a coupling 2, a bearing seat 4, and a stirring mechanism 5 arranged sequentially from top to bottom. The drive mechanism 1 is connected to a rotating shaft 3 via the coupling 2. The bearing seat 4 is provided on the outer side of the rotating shaft 3, and the stirring mechanism 5 is provided below the bearing seat 4. The drive mechanism 1 is used to drive the rotating shaft 3. The coupling 2 is used to connect the drive mechanism 1 and the rotating shaft 3 and transmit torque. The bearing seat 4 is used to support and protect the rotating shaft 3. The stirring mechanism 5 is used to shear and mix the slurry, reagents, and bubbles during rotation. Among them, the drive mechanism 1 serves as the power source of the entire device, converting electrical energy into mechanical rotational motion; the coupling 2 serves as an intermediate link in power transmission, smoothly transmitting the torque output by the drive mechanism 1 to the rotating shaft 3, while compensating for minor coaxiality deviations that may exist during installation; the rotating shaft 3 serves as the main shaft for power transmission, passing through the center of the bearing seat 4, and transmitting the power from above downwards to the stirring mechanism 5 inside the slurry. The entire working process is as follows: After the drive mechanism 1 starts, it outputs rotational motion, which drives the rotating shaft 3 to rotate at high speed under the support of the bearing seat 4 via the coupling 2. The rotating shaft 3 transmits torque to the stirring mechanism 5, which is immersed in the slurry. When the stirring mechanism 5 rotates, it generates a strong shearing and stirring effect on the surrounding slurry. This device realizes integrated direct drive from power input to slurry stirring, eliminating the traditional belt pulley reduction transmission link, significantly improving transmission efficiency. At the same time, the compact layout from top to bottom simplifies the structure and reduces the size of the equipment.

[0036] Specifically, the drive mechanism 1 includes a variable frequency motor 101 and a motor support 102. The variable frequency motor 101 is mounted above the motor support 102, which is located between the variable frequency motor 101 and the coupling 2. The variable frequency motor 101 serves as a power output unit, allowing for flexible speed adjustment based on the properties and processing volume of the coal slime, thereby controlling the stirring intensity. The motor support 102 supports and fixes the variable frequency motor 101, and its structural design allows for axial and radial position adjustment of the motor 101, ensuring good coaxiality between the output shaft of the variable frequency motor 101 and the coupling 2 and rotating shaft 3. During operation, the variable frequency motor 101 operates at a set speed, stably supported by the motor support 102, directly transmitting rotational motion to the coupling 2 below, achieving direct drive and effectively avoiding slippage and energy loss problems in traditional belt drives.

[0037] Specifically, the bearing housing 4 includes an outer cylinder 401, a bearing housing 402, a bearing 403, and a bearing base plate 405. The bearing housing 402 is disposed on the outside of the rotating shaft 3. The bearing 403 is provided between the bearing housing 402 and the rotating shaft 3. The bearing base plate 405 is provided between the stirring mechanism 5 and the bearing housing 402. The outer cylinder 401 is provided above the bearing base plate 405. The outer cylinder 401 is sleeved on the outside of the bearing housing 402. The bearing housing 402 serves as the mounting carrier for the bearing 403, providing positioning and support. The upper and lower bearings 403 support the rotating shaft 3, bearing the radial and axial forces generated during its rotation, ensuring smooth rotation. The bearing base plate 405 serves as the mounting base for the entire bearing housing 4, connecting the upper bearing assembly to the lower stirring mechanism 5. The outer cylinder 401 is fitted over the outer side of the bearing housing 402 and fixed above the bearing base plate 405, forming a closed protective shell. The outer portion of the bearing base plate 405 on the outer side of the outer cylinder 401 is used as a flange to fix the bearing housing 4. During operation, the immersion bearing housing is completely submerged in the slurry. The outer cylinder 401 and the bearing base plate 405 together isolate the external slurry from the internal bearing 403 and bearing housing 402. At the same time, the outer cylinder 401 plays a axial guiding role in the static sorting zone. The rotating shaft 3 rotates stably under the support of the bearing 403, transmitting power through the bearing base plate 405 to the stirring mechanism 5 below, thus achieving reliable transmission in the slurry environment.

[0038] Specifically, the stirring mechanism 5 includes a guide plate 501, a stirring shaft 502, and perforated blades 503. The stirring shaft 502 cooperates with the rotating shaft 3. The upper part of the stirring shaft 502 is provided with the guide plate 501, and the lower part of the stirring shaft 502 is provided with several perforated blades 503. Among them, the stirring shaft 502 is the main force transmission component of the stirring mechanism 5, which is connected to the rotating shaft 3 and rotates synchronously to transmit power to each stirring element. The guide plate 501 is fixed on the upper part of the stirring shaft 502 and is used to divide the internal space of the sorting tank into a turbulent stirring zone at the bottom and a static sorting zone at the top. The perforated blades 503 are installed on the lower part of the stirring shaft 502 and are working elements that directly apply shearing action to the slurry, reagents, and bubbles. During operation, the stirring shaft 502 rotates synchronously with the rotating shaft 3, driving the guide plate 501 and the hollow blades 503 to rotate. The lower hollow blades 503 perform high-intensity shearing and stirring of the slurry, so that the reagents are fully dispersed, the bubbles are cut into microbubbles, and the clay minerals on the surface of the coal particles are stripped off. The guide plate 501 blocks the upward diffusion of the lower turbulence, maintains the stability of the upper selection layer and foam layer, and allows the mineralized bubbles to float smoothly and be recovered. The whole system realizes the functional zoning of stirring and sorting.

[0039] Specifically, the bearing housing 402 and the bearing base plate 405 are sealed together by an O-ring 404. The O-ring 404 is installed in a groove at the bottom of the bearing housing 402, forming a reliable static seal on the mating surfaces of the two through compression with the bearing base plate 405. During operation, when the bearing housing 4 is fully immersed in slurry, water and fine particles in the slurry attempt to seep into the bearing cavity through the gap between the bearing housing 402 and the bearing base plate 405. Under the preload of the assembly, the O-ring 404 undergoes elastic deformation, filling the tiny gaps between the mating surfaces, effectively preventing slurry infiltration, protecting the internal bearing 403 from contamination and corrosion, and ensuring long-term reliable operation of the bearing under good lubrication.

[0040] Specifically, a lip seal 406 is provided between the bearing base plate 405 and the rotating shaft 3, and the lip seal 406 is located below the bearing base plate 405. The lip seal 406 is a dynamic sealing element, with its lip tightly fitting the surface of the rotating shaft 3. During operation, the rotating shaft 3 rotates continuously, and the lip of the lip seal 406 forms an extremely thin sealing contact band on the shaft surface. Even when the rotating shaft 3 is rotating at high speed, it can effectively prevent slurry below the bearing base plate 405 from seeping upwards along the surface of the rotating shaft 3 into the bearing cavity. This structure overcomes the limitation of the O-ring seal 404, which can only achieve static sealing, and solves the dynamic sealing problem at the rotating interface. This allows the immersion bearing housing to maintain internal and external isolation even under rotating conditions, ensuring the sealing reliability of the transmission system.

[0041] Specifically, the guide plate 501 is a disc with a central through hole, and its outer diameter is greater than or equal to the outer diameter of the perforated blade 503. The guide plate 501 acts as a partition, its outer diameter extending beyond the maximum rotation diameter of the perforated blade 503. During operation, the strongly turbulent slurry generated by the rotation of the lower perforated blade 503 is physically blocked by the guide plate 501 as it flows upward, allowing only radial orderly flow through the guide plate 501. The edge region of the guide plate 501 forms a flow buffer zone, protecting the upper separation layer and froth layer from the direct impact of the strong stirring below, maintaining the stability of the separation layer and froth layer during flotation, and facilitating the effective recovery of concentrate particles.

[0042] Specifically, the perforated blades 503 are arranged in several layers from top to bottom, with gaps between adjacent layers. These layers of perforated blades 503 are segmented along the axial direction of the stirring shaft 502, with each layer undertaking a local shearing and mixing task. The gaps between adjacent layers provide channels for the axial flow of the slurry. During operation, the slurry is sheared layer by layer under the rotational drive of the stirring shaft 502. Each time it passes through a layer of perforated blades 503, it undergoes intensified shearing and mixing. Passing through the gaps between layers, it experiences upward exchange flow under the axial pressure gradient, ensuring thorough mixing of the slurry both axially and radially. This multi-layered, multi-regional stirring structure effectively eliminates the problem of dead zones in traditional stirring devices, achieving uniform slurry mixing throughout the entire sorting tank without dead zones.

[0043] Specifically, each layer of the perforated blades 503 is arranged radially with the stirring shaft 502. This radial arrangement ensures that multiple perforated blades 503 within the same layer radiate evenly outwards from the stirring shaft 502, with the rotating surface of the blades fully covering the entire feed channel cross-section. During operation, the stirring shaft 502 drives the multiple perforated blades 503 in each layer to rotate synchronously. The rotating blades repeatedly shear the passing slurry, simultaneously dispersing the added flotation reagents into uniform micro-droplets and shearing the introduced air into numerous dispersed microbubbles. The strong shearing force generated by the radially arranged perforated blades 503 can also effectively peel off the high-ash clay minerals coating the surface of coal particles, exposing the fresh, hydrophobic surface of the coal particles and increasing their adhesion probability to bubbles. This simultaneously achieves three functions: uniform reagent dispersion, microbubble generation, and coal particle surface purification, significantly improving the flotation effect of fine-grained coal slime.

[0044] Example 2 This second embodiment provides a method for using a flotation machine stirring device, which is based on a flotation machine stirring device described in embodiment one, and includes the following steps: Step S1: Immerse the bearing housing (4) and the stirring mechanism (5) into the stirring tank of the flotation machine so that the bearing housing (4) and the stirring mechanism (5) come into contact with the slurry; Step S2: Start the drive mechanism (1), which transmits torque to the rotating shaft (3) through the coupling (2) to drive the rotating shaft (3) to rotate; Step S3: The rotating shaft (3) transmits power to the stirring mechanism (5), causing the stirring mechanism (5) to rotate; Step S4: During the rotation process, the stirring mechanism (5) simultaneously shears and mixes the slurry, reagents and bubbles.

[0045] Specifically, in step S2, the variable frequency motor 101 of the drive mechanism 1 is started. The variable frequency motor 101 is stably supported by the motor support 102, outputting rotational motion and transmitting it directly to the rotating shaft 3 via the coupling 2. Since the variable frequency motor 101 and the rotating shaft 3 use a direct-drive method, without intermediate links such as pulleys or reducers, there is almost no energy loss during torque transmission, significantly improving transmission efficiency. While transmitting torque, the coupling 2 can also compensate for any minor installation deviations that may exist between the output shaft of the variable frequency motor 101 and the rotating shaft 3, ensuring smooth power transmission. The rotating shaft 3 begins to rotate stably under the support of the immersion bearing seat 4, transmitting the power output by the variable frequency motor 101 downwards.

[0046] Specifically, in step S3, the rotating shaft 3 continues to rotate under the support of the bearing seat 4. Its lower end transmits power to the stirring shaft 502 of the stirring mechanism 5 via a threaded connection. The stirring shaft 502 rotates synchronously with the rotating shaft 3. The rotating shaft 3 passes through the center of the bearing seat base plate 405. During this process, the lip seal 406 located below the bearing seat base plate 405 maintains dynamic sealing contact with the surface of the rotating shaft 3, effectively preventing slurry from leaking upwards along the surface of the rotating shaft 3 into the bearing cavity. Simultaneously, the O-ring seal 404 between the bearing seat housing 402 and the bearing seat base plate 405 continuously provides a static seal. Both work together to ensure the sealing reliability of the immersed bearing seat 4 under rotating conditions. After receiving power, the stirring shaft 502 drives the upper fixed guide plate 501 and the lower fixed layers of hollow blades 503 to rotate together.

[0047] Specifically, in step S4, the stirring mechanism 5 simultaneously shears and mixes the slurry, reagents, and bubbles during rotation. The multi-layered perforated blades 503 at the lower part of the stirring shaft 502 exert a strong shearing effect on the slurry during rotation. Since each layer of perforated blades 503 is arranged radially with respect to the stirring shaft 502, its rotational coverage fully covers the entire feed channel cross-section, ensuring no dead angles in the mixing. The multi-layered perforated blades 503 are spaced axially, allowing the slurry to exchange and flow axially through the interlayer gaps while being sheared layer by layer, achieving uniform slurry conditioning throughout the entire area. During this process, the radially arranged perforated blades 503 disperse the added flotation reagents into uniform micro-droplets, achieving uniform reagent dispersion; simultaneously, they shear the introduced air into a large number of dispersed microbubbles, achieving microbubble generation; the strong shearing force can also peel off the high-ash clay minerals coating the surface of the coal particles, exposing the hydrophobic surface of the coal particles and increasing the adhesion probability between the coal particles and bubbles. The outer diameter of the guide plate 501 set on the upper part of the stirring shaft 502 is greater than or equal to the outer diameter of the hollow blade 503, which effectively blocks the upward diffusion of the strong turbulent area in the lower part. The slurry only flows radially and orderly through the guide plate 501, so that a relatively stable static separation zone is formed above the guide plate 501. Mineralized bubbles float steadily to the foam layer in this area and are recovered, thereby completing efficient flotation separation.

[0048] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is merely an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit. Furthermore, the specific names of the functional units and modules are only for easy differentiation and are not intended to limit the scope of protection of this application. The specific working process of the units and modules in the above system can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0049] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can occur depending on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A flotation machine stirring device, characterized in that, The device includes a drive mechanism (1), a coupling (2), a bearing seat (4), and a stirring mechanism (5) arranged sequentially from top to bottom. The drive mechanism (1) is connected to the rotating shaft (3) through the coupling (2). The rotating shaft (3) has a bearing seat (4) on its outer side, and the stirring mechanism (5) is located below the bearing seat (4). The drive mechanism (1) is used to drive the rotating shaft (3); The coupling (2) is used to connect the drive mechanism (1) and the rotating shaft (3) to transmit torque; The bearing housing (4) is used to support and protect the rotating shaft (3); The stirring mechanism (5) is used to shear and mix the slurry, reagents and bubbles during rotation.

2. The flotation machine stirring device according to claim 1, characterized in that, The drive mechanism (1) includes a variable frequency motor (101) and a motor support (102). The variable frequency motor (101) is located above the motor support (102), and the motor support (102) is located between the variable frequency motor (101) and the coupling (2).

3. The flotation machine stirring device according to claim 1, characterized in that, The bearing housing (4) includes an outer cylinder (401), a bearing housing (402), a bearing (403), and a bearing base plate (405). The bearing housing (402) is located on the outside of the rotating shaft (3). The bearing (403) is provided between the bearing housing (402) and the rotating shaft (3). The bearing base plate (405) is provided between the stirring mechanism (5) and the bearing housing (402). The outer cylinder (401) is located above the bearing base plate (405). The outer cylinder (401) is sleeved on the outside of the bearing housing (402).

4. The flotation machine stirring device according to claim 1, characterized in that, The stirring mechanism (5) includes a guide plate (501), a stirring shaft (502) and hollow blades (503). The stirring shaft (502) is engaged with the rotating shaft (3). The upper part of the stirring shaft (502) is provided with a guide plate (501), and the lower part of the stirring shaft (502) is provided with several hollow blades (503).

5. The flotation machine stirring device according to claim 3, characterized in that, The bearing housing (402) and the bearing base plate (405) are sealed together by an O-ring (404).

6. The flotation machine stirring device according to claim 3, characterized in that, A lip seal (406) is provided between the bearing base plate (405) and the rotating shaft (3), and the lip seal (406) is located below the bearing base plate (405).

7. The flotation machine stirring device according to claim 4, characterized in that, The guide plate (501) is a disc with a through hole in the center, and the outer diameter of the guide plate (501) is greater than or equal to the outer diameter of the hollow blade (503).

8. The flotation machine stirring device according to claim 4, characterized in that, The hollow blade (503) has several layers from top to bottom, and there is a gap between two adjacent layers of hollow blade.

9. A flotation machine stirring device according to claim 8, characterized in that, Each layer of the hollow blades (503) is arranged radially with the stirring shaft (502).

10. A method of using a flotation machine stirring device, based on any one of claims 1-9, characterized in that, Includes the following steps: Step S1: Immerse the bearing housing (4) and the stirring mechanism (5) into the separation tank of the flotation machine so that the bearing housing (4) and the stirring mechanism (5) come into contact with the slurry; Step S2: Start the drive mechanism (1), which transmits torque to the rotating shaft (3) through the coupling (2) to drive the rotating shaft (3) to rotate; Step S3: The rotating shaft (3) transmits power to the stirring mechanism (5), causing the stirring mechanism (5) to rotate; Step S4: During the rotation process, the stirring mechanism (5) simultaneously shears and mixes the slurry, reagents and bubbles.

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