Stirring mechanism of coal slime flotation machine

Abstract

The utility model relates to the technical field of coal slime flotation machines, and discloses a stirring mechanism of a coal slime flotation machine, which comprises a sleeve frame, the sleeve frame is a hollow pipe, a rotating shaft is arranged in the sleeve frame, the bottom of the rotating shaft extends to the outside of the sleeve frame and is fixedly provided with an impeller, and the impeller is fixedly connected with the sleeve frame. The top of the rotating shaft extends out of the sleeve frame and is fixedly provided with a belt pulley, an air inlet pipe is fixedly installed on the side wall face of the sleeve frame, an upper disc is arranged above the impeller and can swing up and down when the impeller rotates, the middle of the upper disc is sunken downwards to form a concave face, and a leakage groove is formed in the middle of the upper disc. According to the utility model, a mixed flow direction in which water flows into the impeller from the upper part and flows out from the side surface of the impeller is formed, so that the water flow is tidied, the generation of turbulent flow is reduced, the mixing time is prolonged, the combination degree of coal slime bubbles is improved, and the flotation efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of coal slime flotation machines, in particular to a stirring mechanism of a coal slime flotation machine. Background Art

[0002] Flotation is a common physical and chemical separation technique used in coal processing. It separates coal from impurities by allowing coal slime to contact and adhere to air bubbles. The key to the flotation process lies in the generation of bubbles and their effective contact with coal particles, which directly impacts flotation efficiency and final product quality. To this end, flotation machines are typically equipped with a specialized agitation mechanism. During operation, the impeller generates negative pressure through rotation, drawing in air that mixes with the coal slime, forming a large number of bubbles that promote flotation.

[0003] In existing flotation machine agitation structures, the impeller's primary function is to generate sufficient negative pressure through high-speed rotation, allowing air to be quickly drawn in and mixed with the coal slime. However, in practice, this agitation method can easily lead to technical problems, affecting flotation performance and efficiency.

[0004] First, due to the turbulence generated by the high-speed rotation of the impeller, when air and coal slime mix near the impeller, an unstable flow state is easily generated. This turbulence not only triggers secondary agitation of bubbles, but can also cause existing bubbles to rupture or move irregularly, reducing the contact efficiency between bubbles and coal particles. Secondary agitation and rupture of bubbles directly affect the stability of bubbles during flotation, resulting in a reduction in the effective flotation area and, in turn, affecting the overall efficiency of the flotation process.

[0005] Secondly, existing impeller designs allow mixing of air and coal slime to occur at any location within the impeller. This uncertainty makes the bubble generation process uncontrollable, making it difficult to precisely adjust the size and number of bubbles. This results in a low bubble generation rate, which fails to fully meet the requirements of the flotation process. This low bubble generation rate not only affects the effective contact between the coal slime and the bubbles, but also increases the energy consumption of the flotation machine, reducing the economic efficiency of the flotation process.

[0006] Furthermore, the impeller design failed to adequately consider the location and flow path of bubbles during operation under high negative pressure, resulting in uneven bubble distribution and further reducing flotation efficiency. This uneven bubble distribution prevented some coal slime from fully contacting the bubbles, affecting the recovery rate and purity of the flotation product.

[0007] In summary, the agitation structure of existing flotation machines suffers from turbulence during bubble generation and air-slurry mixing, leading to secondary bubble agitation, low bubble generation rates, and uneven bubble distribution. This negatively impacts flotation efficiency and product quality. Therefore, an improved impeller design and agitation structure are urgently needed to overcome these shortcomings of the existing technology and improve bubble generation efficiency and flotation performance.

[0008] Therefore, we propose a stirring mechanism for a coal slime flotation machine. Utility Model Content

[0009] The utility model mainly solves the technical problems existing in the above-mentioned prior art and provides a stirring mechanism for a coal slime flotation machine.

[0010] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a stirring mechanism of a coal slime flotation machine, comprising a casing rack, which is a hollow tube, a rotating shaft is provided inside the casing rack, the bottom of the rotating shaft extends to the outside of the casing rack and is fixedly installed with an impeller, the top of the rotating shaft extends to the outside of the casing rack and is fixedly installed with a pulley, an air intake pipe is fixedly installed on the side wall of the casing rack, an upper plate is provided above the impeller, the upper plate can swing up and down when the impeller rotates, the middle part of the upper plate is recessed downward to form a concave surface, and a leakage groove is opened in the middle part of the upper plate.

[0011] Preferably, a lower plate is provided below the impeller, and the lower plate can swing up and down following the upper plate, the middle part of the lower plate is recessed downward to form a concave surface and an inlet groove is opened in the middle part of the lower plate, and the inner wall surface of the inlet groove is fixedly installed with multiple groups of brackets, and the multiple groups of brackets are radially evenly distributed inside the inlet groove and the ends are tilted upward to form a conical frame, and the inner wall surface of the inlet groove is also fixedly installed with multiple groups of check plates, which are laid between two adjacent groups of brackets and the ends of the check plates can move freely.

[0012] Preferably, the diameter of the drain groove is the same as the diameter of the casing rack.

[0013] Preferably, the diameter of the inlet groove is 1.5 times the diameter of the casing rack.

[0014] Preferably, a plurality of cross bars are evenly fixedly installed around the periphery of the casing rack, and a positioning shaft is vertically fixedly installed at the end of the cross bar. The positioning shaft passes through the edge of the upper plate, and the upper plate can slide up and down along the positioning shaft.

[0015] Preferably, a reset spring is fixedly installed on the outer wall surface of the positioning shaft at a position corresponding to the position between the cross bar and the upper plate. The reset spring is a tension spring. A shift rod is fixedly installed on the bottom of the side wall of the rotating shaft. The shift rod extends to the concave surface of the upper plate. A guide block is also fixedly installed on the concave surface of the upper plate. The guide block is an arc-shaped block in horizontal projection and the side surface of the guide block is an inclined surface.

[0016] Preferably, a connecting rod is fixedly installed on the edge of the upper plate, and the connecting rod extends downward and is fixedly connected to the lower plate.

[0017] Beneficial effects

[0018] The utility model provides a stirring mechanism for a coal slime flotation machine. It has the following beneficial effects:

[0019] (1) The stirring mechanism of the coal slime flotation machine can gather the coal slime floating above the impeller to the center of the impeller when the upper plate swings up and down. The negative pressure generated by the high-speed rotating impeller causes the air and coal slime to flow outward from the center, forming a mixed flow direction that flows into the impeller from the top and flows out from the side of the impeller. This can organize the water flow, reduce the generation of turbulence, increase the mixing time, improve the binding degree of coal slime bubbles, and improve the flotation efficiency.

[0020] (2) In the stirring mechanism of a coal slime flotation machine, when the lower plate swings downward, the check plate opens, and the floating coal slag below the lower plate flows to the upper part of the lower plate; when the lower plate swings upward, the check plate closes, driving the coal slag above the lower plate to rush to the impeller, and at the same time driving the coal slime around the lower plate to gather below the lower plate, preparing for the next transportation. Through the movement of the lower plate, the coal slime that has sunk to the bottom of the lower plate can also re-enter the bubble circulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are only exemplary, and those skilled in the art can derive other implementation drawings based on the provided drawings without inventive effort.

[0022] The structures, proportions, sizes, etc. illustrated in this specification are intended solely to complement the contents disclosed herein and to facilitate understanding and reading by persons familiar with the art. They are not intended to limit the conditions under which the present invention may be implemented and therefore have no substantive technical significance. Any structural modifications, changes in proportions, or adjustments in size, without affecting the efficacy and objectives of the present invention, shall remain within the scope of the technical contents disclosed herein.

[0023] Figure 1 This is a schematic diagram of the three-dimensional structure of the utility model;

[0024] Figure 2 This is a side view of the utility model;

[0025] Figure 3 This is a schematic diagram of the bottom structure of the utility model;

[0026] Figure 4 This is a schematic diagram of the lower plate structure of the utility model.

[0027] Legend:

[0028] 1. Casing rack; 2. Rotating shaft; 3. Impeller; 4. Inlet pipe; 5. Pulley; 6. Upper plate; 7. Lower plate; 8. Leakage groove; 9. Cross bar; 10. Positioning shaft; 11. Return spring; 12. Guide block; 13. Push rod; 14. Inlet groove; 15. Bracket; 16. Check plate; 17. Connecting rod. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described 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.

[0030] A stirring mechanism for a coal slime flotation machine, such as Figures 1-4 As shown, it includes a casing rack 1, which is a hollow tube. A rotating shaft 2 is provided inside the casing rack 1. The bottom of the rotating shaft 2 extends to the outside of the casing rack 1 and is fixedly installed with an impeller 3. The top of the rotating shaft 2 extends to the outside of the casing rack 1 and is fixedly installed with a pulley 5. An air intake pipe 4 is fixedly installed on the side wall of the casing rack 1. The air intake pipe 4 is communicated with the casing rack 1. In the flotation machine structure, the rotating shaft 2 is fixedly connected to the flotation machine casing through a bearing, the casing rack 1 is fixedly connected to the flotation machine casing, and the top of the air intake pipe 4 extends to the top of the casing rack 1. By driving the pulley 5 to rotate, the impeller 3 is driven to rotate in the coal slime, generating negative pressure, so that the coal slime is fully mixed with the air entering from the rotating shaft 2 and the agent that promotes bubble production entering from the air intake pipe 4, forming bubble flotation coal ore.

[0031] In this embodiment, an upper plate 6 is provided above the impeller 3. The upper plate 6 can swing up and down when the impeller 3 rotates. The middle part of the upper plate 6 is recessed downward to form a concave surface and a leakage groove 8 is opened in the middle part of the upper plate 6. The diameter of the leakage groove 8 is the same as the diameter of the casing rack 1. When the upper plate 6 swings up and down, the coal slime floating above the impeller 3 can be gathered to the center of the impeller 3. The negative pressure generated by the high-speed rotating impeller 3 causes the air and coal slime to flow outward from the center, forming a mixed flow direction that flows into the impeller 3 from the top and flows out from the side of the impeller 3. That is, the water flow is sorted, the generation of turbulence is reduced, the mixing time is increased, the binding degree of the coal slime bubbles is improved, and the flotation efficiency is improved.

[0032] Furthermore, a lower plate 7 is provided below the impeller 3, and the lower plate 7 can swing up and down with the upper plate 6. The middle part of the lower plate 7 is recessed downward to form a concave surface, and an inlet groove 14 is provided in the middle part of the lower plate 7. The diameter of the inlet groove 14 is 1.5 times the diameter of the casing frame 1. The inner wall surface of the inlet groove 14 is fixedly installed with multiple sets of brackets 15. The multiple sets of brackets 15 are radially evenly distributed inside the inlet groove 14 and the ends are tilted upward to form a conical frame. The inner wall surface of the inlet groove 14 is also fixedly installed with multiple sets of check plates 16. The check plates 16 are laid The end of the check plate 16 is freely movable at the position between two adjacent groups of brackets 15. When the lower plate 7 swings downward, the check plate 16 opens, and the floating coal slag below the lower plate 7 flows to the top of the lower plate 7. When the lower plate 7 swings upward, the check plate 16 closes, driving the coal slag above the lower plate 7 to rush to the impeller 3, and at the same time driving the coal slime around the bottom of the lower plate 7 to gather below the lower plate 7, preparing for the next transportation. Through the movement of the lower plate 7, the coal slime that has sunk to the bottom below the lower plate 7 can also re-enter the bubble circulation.

[0033] In this embodiment, multiple groups of cross bars 9 are evenly fixedly installed around the periphery of the casing rack 1, and positioning shafts 10 are vertically fixedly installed at the ends of the cross bars 9. The positioning shafts 10 pass through the edge of the upper plate 6, and the upper plate 6 can slide up and down along the positioning shafts 10 to provide support for the swing of the upper plate 6.

[0034] The outer wall surface of the positioning shaft 10 corresponds to the position between the cross bar 9 and the upper plate 6 and is fixedly installed with a return spring 11. The return spring 11 is a tension spring. When the upper plate 6 moves downward, the upper plate 6 maintains a tendency to return upward, providing upward power for the swing. A shift rod 13 is fixedly installed at the bottom of the side wall of the rotating shaft 2. The shift rod 13 extends to the concave surface of the upper plate 6. A guide block 12 is also fixedly installed on the concave surface of the upper plate 6. The guide block 12 is an arc block in the horizontal projection and the side of the guide block 12 is an inclined surface. When the shift rod 13 rotates with the rotating shaft 2, it is against the guide block 12 through the guide block 12, so that the upper plate 6 swings downward. Through the cooperation of the return spring 11, the guide block 12 and the shift rod 13, the upper plate 6 swings up and down.

[0035] Furthermore, a connecting rod 17 is fixedly installed on the edge of the upper plate 6. The connecting rod 17 extends downward and is fixedly connected to the lower plate 7, thereby driving the lower plate 7 to swing along with the upper plate 6.

[0036] The working principle of the utility model is as follows: when the upper plate 6 swings up and down, the coal slime floating above the impeller 3 can be gathered to the center of the impeller 3. Combined with the negative pressure generated by the high-speed rotating impeller 3, the air and coal slime flow from the center to the outside, forming a mixed flow direction that flows into the impeller 3 from the top and flows out from the side of the impeller 3. That is, the water flow is regulated, the generation of turbulence is reduced, the mixing time is increased, the binding degree of the coal slime bubbles is improved, and the flotation efficiency is improved.

[0037] When the lower plate 7 swings downward, the check plate 16 opens, and the floating coal slag below the lower plate 7 flows to the top of the lower plate 7. When the lower plate 7 swings upward, the check plate 16 closes, driving the coal slag above the lower plate 7 to rush to the impeller 3, and at the same time drives the coal slime around the bottom of the lower plate 7 to gather below the lower plate 7 to prepare for the next transportation. Through the movement of the lower plate 7, the coal slime that sinks to the bottom of the lower plate 7 can also re-enter the bubble circulation.

[0038] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements are intended to fall within the scope of the present invention. The scope of protection claimed in this invention is defined by the appended claims and their equivalents.

Claims

1. A stirring mechanism for a coal slime flotation machine, comprising a casing frame (1), wherein the casing frame (1) is a hollow tube, a rotating shaft (2) is provided inside the casing frame (1), the bottom of the rotating shaft (2) extends to the outside of the casing frame (1) and is fixedly mounted with an impeller (3), the top of the rotating shaft (2) extends to the outside of the casing frame (1) and is fixedly mounted with a pulley (5), and an air inlet pipe (4) is fixedly mounted on the side wall of the casing frame (1), characterized in that: An upper plate (6) is provided above the impeller (3). The upper plate (6) can swing up and down when the impeller (3) rotates. The middle of the upper plate (6) is sunken downward to form a concave surface, and a leakage groove (8) is opened in the middle of the upper plate (6).

2. The stirring mechanism of a coal slime flotation machine according to claim 1, characterized in that: A lower plate (7) is provided below the impeller (3), and the lower plate (7) can swing up and down following the upper plate (6). The middle of the lower plate (7) is recessed downward to form a concave surface, and an inlet groove (14) is provided in the middle of the lower plate (7). Multiple groups of brackets (15) are fixedly installed on the inner wall surface of the inlet groove (14). The multiple groups of brackets (15) are radially evenly distributed inside the inlet groove (14) and their ends are tilted upward to form a conical frame. Multiple groups of check plates (16) are also fixedly installed on the inner wall surface of the inlet groove (14). The check plates (16) are laid between two adjacent groups of brackets (15), and the ends of the check plates (16) can move freely.

3. The stirring mechanism of a coal slime flotation machine according to claim 1, characterized in that: The diameter of the drain groove (8) is the same as the diameter of the casing rack (1).

4. The stirring mechanism of a coal slime flotation machine according to claim 2, characterized in that: The diameter of the inlet groove (14) is 1.5 times the diameter of the casing rack (1).

5. The stirring mechanism of a coal slime flotation machine according to claim 1, characterized in that: A plurality of cross bars (9) are evenly fixedly installed around the periphery of the casing rack (1), and a positioning shaft (10) is vertically fixedly installed at the end of the cross bar (9). The positioning shaft (10) passes through the edge of the upper plate (6), and the upper plate (6) can slide up and down along the positioning shaft (10).

6. The stirring mechanism of the coal slime flotation machine according to claim 5, characterized in that: A reset spring (11) is fixedly installed on the outer wall surface of the positioning shaft (10) at a position corresponding to the position between the cross bar (9) and the upper plate (6). The reset spring (11) is a tension spring. A shift lever (13) is fixedly installed on the bottom of the side wall of the rotating shaft (2). The shift lever (13) extends to the concave surface of the upper plate (6). A guide block (12) is also fixedly installed on the concave surface of the upper plate (6). The guide block (12) is an arc block in horizontal projection and the side surface of the guide block (12) is an inclined surface.

7. The stirring mechanism of a coal slime flotation machine according to claim 1, characterized in that: A connecting rod (17) is fixedly mounted on the edge of the upper plate (6), and the connecting rod (17) extends downward and is fixedly connected to the lower plate (7).

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