Iron ore flotation machine with automatic grading treatment function

Abstract

The invention relates to the field of iron ore flotation, in particular to an iron ore flotation machine with an automatic grading treatment function. An iron ore flotation machine capable of achieving automatic grading treatment comprises an outer barrel, supporting legs and the like. And four supporting legs are fixedly connected outside the outer cylinder. The stirring barrel is arranged in the flotation barrel, ore pulp is stirred in the stirring barrel, the ore pulp is primarily graded, the upper-layer ore pulp is transferred into the flotation barrel in an overflow mode and then collected into the outer barrel, grading treatment of the ore pulp is continuously conducted, and the lower-layer ore pulp is discharged from the lower portion of the stirring barrel through the rotating disc which is intermittently opened; when lower-layer ore pulp enters clean water in the flotation cylinder, fine-grain ore pulp wrapped in the lower-layer ore pulp is separated, so that secondary grading of the lower-layer ore pulp is realized, the impurity content of coarse-grain ore pulp is reduced, the grade of concentrate is improved, and the recovery rate of refined iron ore is effectively improved.

Description

Technical Field

[0001] The invention relates to the field of iron ore flotation, and in particular to an iron ore flotation machine for automatic grading treatment. Background Art

[0002] With the rapid development of my country's economy, the domestic demand for iron ore is increasing, the easily selectable iron ore resources are becoming increasingly scarce, and a large amount of poor and fine hematite has not yet been developed and utilized. Due to its poor selectivity, mineral processing is difficult and the cost of iron ore development is increasing year by year.

[0003] Commonly used mineral processing methods, such as gravity separation and magnetic separation, are difficult to obtain high-quality iron ore concentrate in actual production. The grade of iron ore is low and its recovery rate is low. For fine-grade iron ore that is not magnetic, flotation is generally used. The existing flotation process generally grinds the iron ore to form a slurry, and then adds a flotation agent. After mixing, it is hydraulically or spirally classified, and then flotation and concentration are performed. However, when the slurry is classified, the coarse-grained slurry often sinks with the fine-grained slurry, resulting in poor classification effect. The coarse-grained slurry has a high impurity content, and the classification and flotation are carried out in different equipment, which affects the flotation efficiency of the slurry. Summary of the invention

[0004] In order to overcome the shortcomings of the prior art that, when the flotation method is used to classify the ore pulp, the coarse-grained ore pulp often entrains the fine-grained ore pulp to sink, resulting in poor classification effect and high impurity content in the coarse-grained ore pulp, the present invention provides an iron ore flotation machine for automated classification processing.

[0005] The technical scheme is: an iron ore flotation machine for automatic classification processing, including an outer cylinder and legs; four legs are fixedly connected to the outer side of the outer cylinder; it also includes a flotation cylinder, a concentrate pipe, a stirring cylinder, a stirring and classification unit, a connecting plate and a coarse ore discharge unit; a flotation cylinder is fixedly connected to the outer cylinder; a plurality of equally distributed overflow ports are opened on the side wall of the flotation cylinder; a foam cavity is opened on the outer cylinder; a tailings pipe is fixedly connected to the outer cylinder; the tailings pipe is connected to the foam cavity; the outer cylinder is connected to all the overflow ports; a conical portion is provided at the lower part of the flotation cylinder; the concentrate pipe is fixedly connected to the conical portion, The concentrate pipe passes through the conical part; a stirring drum is arranged in the flotation drum; the flotation drum is connected with a stirring and classifying unit; the stirring and classifying unit is used to stir the slurry in the stirring drum; an annular groove is formed between the flotation drum and the stirring drum; a number of connecting plates are fixedly connected between the flotation drum and the stirring drum; the flotation drum is connected with a coarse ore discharging unit; the coarse ore discharging unit is connected to one of the connecting plates; the coarse ore discharging unit is connected to the stirring drum; three through grooves and a sealing part are provided at the bottom of the stirring drum; the coarse ore discharging unit is used to cooperate with each through groove to discharge the coarse ore.

[0006] Further, the stirring and classification unit includes a suspension, a first motor, and a stirring paddle; the flotation cylinder is fixedly connected with the suspension; the suspension is equipped with the first motor; the middle part of the suspension is rotatably connected with the stirring paddle; the stirring paddle is composed of a central shaft and stirring blades; the stirring paddle is connected to the output shaft of the first motor through a belt drive; the stirring paddle is rotatably connected to the stirring cylinder.

[0007] Further, the central shaft of the stirring paddle is also provided with spiral-twisted swirling stirring blades for separating the coarse pulp and the fine pulp of the pulp.

[0008] Further, the coarse ore discharging unit includes a power assembly, a rotating disk, and an external tooth ring; the flotation cylinder is connected with the power assembly; the stirring cylinder is rotatably connected with the rotating disk; the rotating disk is provided with a slag discharging port and a sealing part; the slag discharging port is matched with the through groove for discharging the coarse-grade pulp; the rotating disk is fixedly connected with the external tooth ring; the power unit is connected with the external tooth ring; the power assembly is used to drive the rotating disk to rotate.

[0009] Further, the power assembly includes a second motor, a rotating shaft, and a gear; the flotation cylinder is equipped with the second motor; one of the connecting plates is rotatably connected with the rotating shaft; the rotating shaft is connected to the output shaft of the second motor through a belt drive; the rotating shaft is fixedly connected with the gear; the external tooth ring meshes with the gear.

[0010] Further, a guiding ring is fixedly connected inside the outer cylinder. The guiding ring is located in the foam cavity and is provided with a wedge-shaped surface. The guiding ring is used to guide the tailings to the tailings pipe.

[0011] Further, the concentrate pipe is L-shaped, and the pipe orifice of the concentrate pipe is close to the bottom of the conical part.

[0012] Further, the top of the connecting plate is provided with an arc chamfer to reduce the retention of ore materials on the top of the connecting plate.

[0013] Further, a spiral pipe fixedly connected to the stirring paddle is also included; the spiral pipe is rotatably connected to the stirring cylinder.

[0014] Further, an air pump installed on one side of the suspension away from the first motor is also included; the air outlet of the air pump is communicated with an air pipe; a through hole is opened in the central shaft of the stirring paddle, and the through hole is communicated with the air pipe; a hollow cavity is opened in the spiral pipe, and the hollow cavity of the spiral pipe is communicated with the through hole of the central shaft of the stirring paddle; a number of air holes are evenly opened on the spiral pipe; all the air holes are communicated with the hollow cavity of the spiral pipe; the air pipe is rotatably connected with the stirring paddle.

[0015] Beneficial effects: 1. In the present invention, a stirring cylinder is arranged inside the flotation cylinder, and the pulp is stirred inside the stirring cylinder to initially classify the pulp. The upper-layer pulp is transferred into the flotation cylinder by means of overflow and then collected into the outer cylinder, enabling continuous classification treatment of the pulp. The lower-layer pulp is discharged from the lower part of the stirring cylinder through a rotating disk that is intermittently opened. When clear water enters the flotation cylinder along with the lower-layer pulp, the fine-grained pulp entrained in the lower-layer pulp is separated, thereby achieving secondary classification of the lower-layer pulp, reducing the impurity content of the coarse-grained pulp, increasing the grade of the concentrate, and effectively improving the recovery rate of iron concentrate.

[0016] 2. By providing a spiral tube, the rotation of the spiral tube can not only disperse the lower-layer pulp being discharged, but also pump air into the spiral tube. The gas sprays out from each air hole to form microbubbles. The rotating spiral tube enables the microbubbles to fully contact the fine-grained pulp and combine with the fine-grained pulp to form mineralized bubbles that float upward, making the separation of the fine-grained pulp and the coarse-grained pulp more thorough, achieving further microbubble flotation separation of the pulp, and effectively increasing the recovery rate of the concentrate. Description of the Drawings

[0017] Figure 1 is a three-dimensional structural schematic diagram of the first perspective of the present invention; Figure 2 is a three-dimensional structural schematic diagram of the second perspective of the present invention; Figure 3 is a partial cross-sectional view of the outer cylinder, flotation cylinder, and stirring cylinder of the present invention; Figure 4 is a schematic diagram of the opening position of the overflow port of the present invention; Figure 5 is a schematic diagram of the relative position between the tailings pipe and the guiding ring of the present invention; Figure 6 is a schematic diagram of the opening position of the through groove of the present invention; Figure 7 is a schematic diagram of the opening position of the air holes of the present invention.

[0018] Reference numerals in the drawings: 1 - outer cylinder, 2 - support feet, 3 - flotation cylinder, 4 - concentrate pipe, 5 - stirring cylinder, 6 - suspension, 7 - first motor, 8 - stirring paddle, 9 - connecting plate, 10 - second motor, 11 - rotating shaft, 12 - gear, 13 - rotating disk, 14 - external tooth ring, 15 - spiral tube, 16 - air pump, 17 - air pipe, 1001 - tailings pipe, 1002 - foam chamber, 1003 - guiding ring, 3001 - conical part, 3002 - overflow port, 5001 - through groove, 5002 - sealing part, 8001 - swirl stirring blade, 1301 - slag discharge port, 1302 - sealing part, 1501 - air holes. Detailed Embodiments

[0019] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments, but it is not intended to limit the present invention.

[0020] The first embodiment An iron ore flotation machine for automated classification processing, according to Figures 1 - 7 As shown, it includes an outer cylinder 1 and support feet 2; four support feet 2 distributed in a rectangle are connected to the outside of the outer cylinder 1 by bolts; It also includes a flotation cylinder 3, a concentrate pipe 4, a stirring cylinder 5, a stirring and classification unit, a connecting plate 9, and a coarse ore discharging unit; the flotation cylinder 3 is fixedly connected inside the outer cylinder 1; a number of equally spaced overflow ports 3002 are opened on the side wall of the flotation cylinder 3; a foam chamber 1002 is opened on the outer cylinder 1; a tailings pipe 1001 is fixedly connected to the lower part of the outer cylinder 1; the tailings pipe 1001 is communicated with the foam chamber 1002; the outer cylinder 1 is communicated with all the overflow ports 3002; a conical part 3001 is provided at the lower part of the flotation cylinder 3; the conical part 3001 is fixedly connected with the concentrate pipe 4, and the concentrate pipe 4 penetrates through the conical part 3001; a stirring cylinder 5 is arranged inside the flotation cylinder 3; a stirring and classification unit is connected to the upper part of the flotation cylinder 3; an annular groove is formed between the flotation cylinder 3 and the stirring cylinder 5; a number of connecting plates 9 distributed in an annular array are fixedly connected between the flotation cylinder 3 and the stirring cylinder 5; the flotation cylinder 3 is connected with a coarse ore discharging unit; the coarse ore discharging unit is connected with one of the connecting plates 9; the coarse ore discharging unit is connected with the stirring cylinder 5; there are three L-shaped through grooves 5001 and a sealing part 5002 at the bottom of the stirring cylinder 5.

[0021] The stirring and classification unit includes a suspension 6, a first motor 7, and a stirring paddle 8; the suspension 6 is fixedly connected to the flotation cylinder 3; the first motor 7 is installed on the suspension 6; the middle part of the suspension 6 is rotatably connected with the stirring paddle 8; the stirring paddle 8 is composed of a central shaft and stirring blades; the stirring paddle 8 is connected to the output shaft of the first motor 7 through a belt drive; the stirring paddle 8 is rotatably connected with the stirring cylinder 5.

[0022] A spiral torsion-shaped swirl stirring blade 8001 is also arranged on the central shaft of the stirring paddle 8.

[0023] The coarse ore discharging unit includes a power assembly, a rotating disk 13, and an external gear ring 14; the flotation cylinder 3 is connected with the power assembly; the rotating disk 13 is rotatably connected to the bottom of the stirring cylinder 5; there is a fan-shaped slag discharging port 1301 and a sealing part 1302 on the rotating disk 13; the outer ring surface of the rotating disk 13 is fixedly connected with the external gear ring 14; the power unit is connected with the external gear ring 14.

[0024] The power assembly includes a second motor 10, a rotating shaft 11, and a gear 12; the second motor 10 is installed on the upper part of the flotation cylinder 3; the rotating shaft 11 is rotatably connected to one of the connecting plates 9; the rotating shaft 11 is connected to the output shaft of the second motor 10 through a belt drive; the gear 12 is fixedly connected to the lower part of the rotating shaft 11; the external gear ring 14 meshes with the gear 12.

[0025] A guiding ring 1003 is fixedly connected inside the outer cylinder 1. The guiding ring 1003 is located inside the foam cavity 1002, and a wedge-shaped surface is provided on the guiding ring 1003.

[0026] The concentrate pipe 4 is L-shaped, and the pipe orifice of the concentrate pipe 4 is close to the bottom of the conical part 3001.

[0027] An arc chamfer is provided at the top of the connecting plate 9.

[0028] The working steps of the above embodiment are as follows: First, through the conveying pipeline, water, pulp and reagent are respectively introduced into the mixing cylinder 5. Different combined reagents must be used according to iron ores with different components. Here, only sodium oleate is described as the reagent. Sodium oleate is a flotation reagent often used in ore dressing. The main function of sodium oleate is to adsorb on the surface of minerals, enhance the hydrophobicity of minerals, and improve the flotation effect of iron ores. Thus, the pulp is divided into concentrates and tailings with different iron grades, realizing the ore dressing work of iron ores. At the beginning, the slag discharge port 1301 cooperates with the sealing part 5002, and the sealing part 5002 blocks the slag discharge port 1301. At the same time, the sealing part 1302 also blocks each through groove 5001, so that the pulp will not leak out of the mixing cylinder 5. Then, the reagent and the pulp are both introduced into the mixing cylinder 5, and the liquid level of the mixed liquid reaches the upper opening edge of the mixing cylinder 5 and overflows. And clear water is pre-filled into the flotation cylinder 3, and the liquid level of the clear water reaches the position of the overflow port 3002, and a collecting bucket is arranged below the tailings pipe 1001 to collect tailings. At this time, the preparation process of ore dressing is completed.

[0029] Next, control the start of the first motor 7. The output shaft of the first motor 7 drives the stirring paddle 8 to rotate through a belt. The stirring paddle 8 agitates and mixes the pulp and reagent in the stirring cylinder 5, facilitating the full combination of the pulp and the reagent. And through the agitation of the swirl stirring blade 8001, the pulp in the stirring cylinder 5 gradually stratifies. The fine-grained pulp is in the upper layer, and the coarse-grained pulp is in the lower layer. Among them, the fine-grained pulp is mainly gangue minerals such as quartz, while the coarse-grained pulp is mainly iron minerals. At this time, the preliminary classification and desliming of the pulp are completed. Then, continue to feed the pulp and reagent into the stirring cylinder 5. As a result, the upper-layer pulp in the stirring cylinder 5 will overflow. Thus, the classification treatment of the pulp is carried out continuously. The upper-layer pulp is mainly fine-grained pulp. The overflowed pulp flows down along the outer wall of the stirring cylinder 5 and enters the flotation cylinder 3. And the flotation cylinder 3 is pre-filled with clear water. After the pulp flows into the flotation cylinder 3, since the pulp surface is attached with a reagent and has hydrophobicity at this time, and the pulp particle size is small, and the buoyancy is equal to the gravity of the pulp particles, the fine-grained pulp floats on the surface of the clear water in the flotation cylinder 3. Since the clear water liquid level in the flotation cylinder 3 is flush with the overflow port 3002, the fine-grained pulp then flows into the foam chamber 1002 along the overflow port 3002. The fine-grained pulp slides down along the outer wall of the flotation cylinder 3 to the bottom of the foam chamber 1002. At this time, a guiding ring 1003 with a wedge-shaped surface is arranged in the foam chamber 1002. The flowing-down fine-grained pulp then flows along the wedge-shaped surface of the guiding ring 1003 and gathers near the tailings pipe 1001. At this time, the pulp in the foam chamber 1002 can be pumped out through the tailings pipe 1001 and collected in the tailings collection bucket.

[0030] Among them, as the pulp and the potion are introduced into the stirring cylinder 5, after the coarse pulp combines with the potion, its gravity is greater than the buoyancy. Even if there is a stirring paddle 8 continuously stirring in the stirring cylinder 5, the coarse pulp will still gradually accumulate at the lower part of the stirring cylinder 5, that is, the above-mentioned stratification. As the coarse pulp accumulates, it will affect the rotation of the stirring paddle 8. Therefore, first stop pouring the pulp and the medicament into the stirring cylinder 5, and then control the start of the second motor 10. The output shaft of the second motor 10 drives the rotating shaft 11 to rotate through a belt. The rotating shaft 11 drives the gear 12 to drive the external tooth ring 14 to rotate. The external tooth ring 14 drives the rotating disk 13 to rotate. When the slag discharge port 1301 rotates to cooperate with one of the through grooves 5001, the coarse pulp at the lower part of the stirring cylinder 5 is discharged downward from the through groove 5001 and the slag discharge port 1301. Since the liquid level in the stirring cylinder 5 is relatively high, the pressure in the stirring cylinder 5 discharges the pulp downward, and the lower-layer coarse pulp also enters the flotation cylinder 3 accordingly. When the liquid level of the pulp in the stirring cylinder 5 is flush with the liquid level in the flotation cylinder 3, control the start of the second motor 10 to make the sealing part 1302 block the through groove 5001 again, and then continue to pour the pulp and the medicament into the stirring cylinder 5 to continue the classification treatment of the pulp. The gravity of the coarse pulp in the flotation cylinder 3 is still greater than the buoyancy, so the coarse pulp continues to sink. Finally, the coarse pulp accumulates in the conical part 3001. At this time, it is connected to the concentrate pipe 4 through an external suction pump. The external suction pump sucks out the coarse pulp accumulated in the conical part 3001 through the concentrate pipe 4 and stores it in the concentrate collection bucket. Among them, when separating the fine pulp from the coarse pulp, there will also be some fine pulp mixed in the coarse pulp and precipitated together. When discharging the lower-layer pulp into the flotation cylinder 3, the fine pulp mixed in the lower-layer pulp floats up after mixing into the water in the flotation cylinder 3, and only the coarse pulp continues to sink. Thus, the secondary classification of the lower-layer pulp is realized, reducing the possibility of coarse iron concentrate running away and effectively improving the recovery rate of iron concentrate.

[0031] The second embodiment On the basis of the first embodiment, according to Figures 3 - 7 As shown, it further includes a spiral pipe 15; a spiral pipe 15 is fixedly connected to the lower part of the stirring paddle 8; the spiral pipe 15 is rotatably connected to the stirring cylinder 5.

[0032] It further includes an air pump 16 and an air pipe 17; an air pump 16 is installed on one side of the suspension 6 away from the first motor 7; the air outlet of the air pump 16 is communicated with an air pipe 17; a through hole is opened in the central axis of the stirring paddle 8, and the through hole is communicated with the air pipe 17; a hollow cavity is opened in the spiral pipe 15, and the hollow cavity of the spiral pipe 15 is communicated with the through hole of the central axis of the stirring paddle 8; a plurality of air holes 1501 are evenly opened on the spiral pipe 15; all the air holes 1501 are communicated with the hollow cavity of the spiral pipe 15; the air pipe 17 is rotatably connected to the stirring paddle 8.

[0033] The working steps of the above embodiment are as follows: When the coarse pulp of the lower layer is discharged into the flotation cylinder 3, the stirring paddle 8 is still rotating. On the basis of the first embodiment, when the coarse pulp of the lower layer in the stirring cylinder 5 is transferred to the flotation cylinder 3, the fine pulp mixed in the coarse pulp of the lower layer is separated, thereby improving the recovery rate of iron concentrate. A spiral pipe 15 is arranged at the lower part of the stirring cylinder 5, and the spiral pipe 15 is connected to the central axis of the stirring paddle 8. Thus, when the lower pulp is discharged into the flotation cylinder 3, the rotation of the stirring paddle 8 is maintained, and at the same time, the spiral pipe 15 is driven to rotate. As Figure 7 shown, the rotating spiral pipe 15 contacts the lower pulp discharged from the stirring cylinder 5, and breaks up the sinking pulp, thereby further dispersing the fine pulp wrapped in the coarse pulp, facilitating the floating of the fine pulp, reducing the impurity content of the coarse pulp, and improving the grade of the concentrate.

[0034] On the basis of the above work, the operation of air flotation is added, that is, the air pump 16 is controlled to start. The air pump 16 filters and compresses the external air and pumps it into the through hole of the central axis of the stirring paddle 8 through the air pipe 17. Then the air enters the spiral pipe 15 through the through hole of the central axis of the stirring paddle 8. A number of small air holes 1501 are opened on the spiral pipe 15. As the spiral pipe 15 rotates, tiny bubbles emerge from each air hole 1501. Thus, after the spiral pipe 15 is used to break up the lower pulp entering the flotation cylinder 3, the tiny bubbles are fully contacted with the pulp. The fine pulp in the lower pulp forms mineralized bubbles with the micro bubbles, making the separation of the fine pulp and the coarse pulp more complete. The floating mineralized bubbles float to the liquid surface of the flotation cylinder 3 and enter the foam chamber 1002 through the overflow port 3002. Thus, the microbubble flotation separation of the pulp is further realized, and the recovery rate of the concentrate is effectively improved.

[0035] The above is only the specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. An iron ore flotation machine with automated grading processing, comprising an outer cylinder (1) and support feet (2); four support feet (2) are fixedly connected to the outside of the outer cylinder (1); it is characterized in that, It also includes a flotation cylinder (3), a concentrate pipe (4), a stirring cylinder (5), a stirring and classification unit, a connecting plate (9) and a coarse ore discharging unit; a flotation cylinder (3) is fixedly connected inside the outer cylinder (1); a number of equally spaced overflow ports (3002) are formed in the side wall of the flotation cylinder (3); a foam chamber (1002) is formed in the outer cylinder (1); a tailings pipe (1001) is fixedly connected to the outer cylinder (1); the tailings pipe (1001) is communicated with the foam chamber (1002); the outer cylinder (1) is communicated with all the overflow ports (3002); a conical part (3001) is arranged at the lower part of the flotation cylinder (3); a concentrate pipe (4) is fixedly connected to the conical part (3001), and the concentrate pipe (4) penetrates through the conical part (3001); a stirring cylinder (5) is arranged inside the flotation cylinder (3); the flotation cylinder (3) is connected with a stirring and classification unit; the stirring and classification unit is used for stirring the pulp in the stirring cylinder (5); an annular groove is formed between the flotation cylinder (3) and the stirring cylinder (5); a number of connecting plates (9) are fixedly connected between the flotation cylinder (3) and the stirring cylinder (5); the flotation cylinder (3) is connected with a coarse ore discharging unit; the coarse ore discharging unit is connected with one of the connecting plates (9); the coarse ore discharging unit is connected with the stirring cylinder (5); three through grooves (5001) and a sealing part (5002) are arranged at the bottom of the stirring cylinder (5); the coarse ore discharging unit is used for discharging coarse ore in cooperation with each through groove (5001).

2. The iron ore flotation machine for automated grading treatment according to claim 1, wherein The stirring and classification unit includes a suspension (6), a first motor (7) and a stirring paddle (8); a suspension (6) is fixedly connected to the flotation cylinder (3); a first motor (7) is installed on the suspension (6); a stirring paddle (8) is rotatably connected to the middle of the suspension (6); the stirring paddle (8) consists of a central shaft and stirring blades; the stirring paddle (8) is connected with the output shaft of the first motor (7) through a belt drive; the stirring paddle (8) is rotatably connected with the stirring cylinder (5).

3. An iron ore flotation machine for automated grading treatment according to claim 2, characterized in that A spiral torsion type swirling stirring blade (8001) is further arranged on the central shaft of the stirring paddle (8) for separating the coarse particle pulp and the fine particle pulp of the pulp.

4. An iron ore flotation machine for automated grading treatment according to claim 1, characterized in that, The coarse ore discharging unit includes a power assembly, a rotating disk (13) and an external tooth ring (14); the flotation cylinder (3) is connected with a power assembly; the rotating disk (13) is rotatably connected to the stirring cylinder (5); a slag discharging port (1301) and a sealing part (1302) are formed on the rotating disk (13); the slag discharging port (1301) cooperates with the through groove (5001) for discharging the coarse grade pulp; the external tooth ring (14) is fixedly connected to the rotating disk (13); the power unit is connected with the external tooth ring (14); the power assembly is used for driving the rotating disk (13) to rotate.

5. An iron ore flotation machine with automated grading treatment according to claim 4, characterized in that, The power assembly includes a second motor (10), a rotating shaft (11) and a gear (12); the second motor (10) is installed on the flotation cylinder (3); the rotating shaft (11) is rotatably connected to one of the connecting plates (9); the rotating shaft (11) is connected with the output shaft of the second motor (10) through a belt drive; the gear (12) is fixedly connected to the rotating shaft (11); the external tooth ring (14) meshes with the gear (12).

6. An iron ore flotation machine for automated grading treatment according to claim 5, characterized in that, A guiding ring (1003) is fixedly connected inside the outer cylinder (1). The guiding ring (1003) is located inside the foam cavity (1002). A wedge-shaped surface is provided on the guiding ring (1003). The guiding ring (1003) is used to guide the tailings to the tailings pipe (1001).

7. An iron ore flotation machine with automated grading treatment according to claim 6, characterized in that The concentrate pipe (4) is L-shaped, and the pipe orifice of the concentrate pipe (4) is close to the bottom of the conical part (3001).

8. An iron ore flotation machine for automated classification processing according to any one of claims 1-7, characterized in that, An arc chamfer is provided at the top of the connecting plate (9) to reduce the retention of ore materials on the top of the connecting plate (9).

9. An iron ore flotation machine for automated grading treatment according to claim 8, characterized in that, It further includes a spiral pipe (15) fixedly connected to the stirring paddle (8); the spiral pipe (15) is rotatably connected to the stirring cylinder (5).

10. An iron ore flotation machine with automated grading processing according to claim 9, characterized in that, It further includes an air pump (16) installed on one side of the suspension (6) far from the first motor (7); an air pipe (17) is connected to the air outlet of the air pump (16); a through hole is opened in the central axis of the stirring paddle (8), and the through hole is communicated with the air pipe (17); a hollow cavity is opened in the spiral pipe (15), and the hollow cavity of the spiral pipe (15) is communicated with the through hole of the central axis of the stirring paddle (8); a number of air holes (1501) are evenly opened on the spiral pipe (15); all the air holes (1501) are communicated with the hollow cavity of the spiral pipe (15); the air pipe (17) is rotatably connected to the stirring paddle (8).

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