Flotation impurity removal device for converting power coal into coking coal

Abstract

The invention belongs to the technical field of flotation impurity removal equipment, and discloses a flotation impurity removal device for converting power coal into coking coal, which is technically characterized by comprising an impurity removal box, a top plate is fixedly mounted at the top of the impurity removal box through a bracket, and a vertical cylinder is rotatably mounted between the top plate and the inner bottom wall of the impurity removal box; a plurality of groups of annularly distributed stirring rods are fixedly mounted on the surface of the vertical cylinder along different heights, a rotating assembly matched with the vertical cylinder is arranged on the surface of the top plate, a bubble generating mechanism is arranged on the surface of the vertical cylinder, and the bubble generating mechanism comprises an air guide assembly and a layering generating assembly; the layering generation assembly comprises a sealing part and a driving part, the layering generation assembly is matched with the air guide assembly, bubbles can be controlled to be sequentially generated on the surfaces of the stirring rods at different depths, the bubbles at the different depths move upwards in pulverized coal slurry, the bubbles can be in full contact with pulverized coal particles in the slurry, and the stirring efficiency is improved. And the adhesion effect of the bubbles on the pulverized coal particles is effectively improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of flotation impurity removal equipment, and particularly relates to a flotation impurity removal device for power coal conversion coking coal. BACKGROUND

[0002] Coal flotation is a physical and chemical separation method based on the difference in wettability of coal and gangue particles, and is mainly used for treating fine coal slurry smaller than 0.5 mm. The core principle is that hydrophobic coal particles adhere to bubbles and float out, while hydrophilic gangue particles remain in the coal slurry, thereby realizing separation.

[0003] When the coal slurry is subjected to flotation impurity removal, a flotation reagent needs to be added to the slurry, and bubbles need to be injected, and then the slurry is stirred.

[0004] In the prior art, the gas conveying pipeline is generally fixed at the bottom of the slurry, and the bubbles always move upward from the bottom of the slurry. Since the surface area of the bubbles is small, the path of the bubbles moving upward is long, and the bubbles cannot fully contact the coal particles in the slurry. The coal particles in the middle and upper part of the slurry cannot be effectively adhered to the surface of the bubbles, and more time is needed to generate more bubbles to adhere to the coal particles, resulting in low overall flotation impurity removal efficiency and poor use effect. SUMMARY

[0005] The present application aims to provide a flotation impurity removal device for power coal conversion coking coal to solve the problems in the background.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0007] A flotation impurity removal device for power coal conversion coking coal, comprising an impurity removal box, an opening is arranged at the top end of the impurity removal box, support legs are fixedly installed around the bottom wall of the impurity removal box, a slurry discharge pipe is arranged on the bottom wall of the impurity removal box, a control valve is arranged on the surface of the slurry discharge pipe, a top plate is fixedly installed on the top of the impurity removal box through a support, a vertical cylinder is rotatably installed between the top plate and the inner bottom wall of the impurity removal box, a plurality of groups of stirring rods in annular distribution are fixedly installed on the surface of the vertical cylinder at different heights, a rotating assembly is arranged on the surface of the top plate and cooperates with the vertical cylinder, the rotating assembly is used to control the rotation of the vertical cylinder around its own axis in the inner cavity of the impurity removal box, a bubble generating mechanism is arranged on the surface of the vertical cylinder, the bubble generating mechanism comprises a gas guiding assembly and a layered generating assembly, the gas guiding assembly is connected with the stirring rods, and the gas guiding assembly is used to control the generation of bubbles on the surface of the stirring rods, the layered generating assembly comprises a sealing part and a driving part, the sealing part is located in the inner cavity of the vertical cylinder, the driving part is located on the inner bottom of the vertical cylinder and is connected with the sealing part, and the driving part controls the stirring rods at different heights to generate bubbles in sequence through cooperation with the sealing part.

[0008] As a further scheme of the present application: the rotating assembly comprises a positioning gear ring fixedly installed on the top plate above the vertical cylinder surface, the top plate surface is fixedly installed with a fixed frame outside the vertical cylinder, the fixed frame surface is fixedly installed with a motor, the output shaft of the motor is fixedly installed with a transmission gear disc, and the transmission gear disc is engagedly connected with the positioning gear ring.

[0009] As a further scheme of the present application: the air guide assembly comprises an air guide cavity opened in the stirring rod, the air guide cavity is communicated with the vertical cylinder inner cavity, a plurality of uniformly distributed air exhaust holes are opened in the surface of the stirring rod and communicated with the air guide cavity, an air guide pipe is movably connected to the top end of the vertical cylinder, and the end of the air guide pipe away from the vertical cylinder is connected with an external air pump.

[0010] As a further scheme of the present application: the sealing part comprises a piston plate slidably installed in the vertical cylinder inner cavity along the vertical direction, the surface of the piston plate is fixedly installed with a sealing cylinder, the outer side wall of the sealing cylinder is matched with the inner side wall of the vertical cylinder, the sealing cylinder is slidably connected with the vertical cylinder along the vertical direction, the top end of the sealing cylinder is penetrated, a support frame located in the vertical cylinder inner cavity is fixedly installed on the inner bottom wall of the impurity removal box, and the surface of the support frame is fixedly installed with a compression spring, and the extension end of the compression spring is connected with the piston plate.

[0011] As a further scheme of the present application: the driving part comprises a plurality of air guide grooves opened in the surface of the sealing cylinder and matched with the air guide cavity, the distance between the air guide cavity and the air guide groove in the inside of the lower support leg gradually increases, a bearing column is rotatably installed in the support frame, the surface of the bearing column is fixedly installed with a winding disc, the surface of the winding disc is wound with a pulling rope, the end of the pulling rope away from the winding disc penetrates through the support frame and is connected with the piston plate, one end of the bearing column extends to the outside of the support frame and is fixedly installed with a fixed gear disc, a fixed ring located below the fixed gear disc is fixedly installed in the vertical cylinder inner cavity through the support frame, the surface of the fixed ring is fixedly installed with an arc-shaped gear rack, and the gear rack is engagedly matched with the fixed gear disc.

[0012] As a further scheme of the present application: a plurality of limiting grooves are opened in the inner side wall of the vertical cylinder, and a limiting block is fixedly installed on the surface of the sealing cylinder and slidably connected with the limiting grooves along the vertical direction.

[0013] As a further scheme of the present application: a scraper is fixedly installed on the surface of the vertical cylinder and matched with the inner bottom wall of the impurity removal box.

[0014] As a further scheme of the present application: a ring-shaped positioning groove is opened in the inner bottom wall of the impurity removal box, and the bottom end of the vertical cylinder is rotatably installed in the positioning groove.

[0015] Compared with the prior art, the beneficial effects of the present application are that by setting the layered generating assembly composed of the sealing part and the driving part in cooperation with the air guide assembly, the bubbles can be generated on the surface of the stirring rod at different depths in turn, the bubbles at different depths move upward in the coal slurry, the bubbles can fully contact the coal particles in the slurry, the adhesion effect of the bubbles on the coal particles is effectively improved, and the flotation efficiency of the coal particles is effectively improved. The problems that the path of the bubbles moving upward is long, the bubbles cannot fully contact the coal particles in the slurry, the overall flotation and impurity removal efficiency is low, and the use effect is poor are solved. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 A perspective structural schematic diagram of a power coal conversion coking coal flotation and impurity removal device is provided in the embodiments of the present application.

[0017] Figure 2 A front view structural schematic diagram of a power coal conversion coking coal flotation and impurity removal device is provided in the embodiments of the present application.

[0018] Figure 3 An internal section view structural schematic diagram of an impurity removal box in a power coal conversion coking coal flotation and impurity removal device is provided in the embodiments of the present application.

[0019] Figure 4 A vertical cylinder and its connecting structure schematic diagram in a power coal conversion coking coal flotation and impurity removal device is provided in the embodiments of the present application.

[0020] Figure 5 A Figure 4 Enlarged structural schematic diagram of A.

[0021] Figure 6 A Figure 2 Enlarged structural schematic diagram of B.

[0022] Figure 7 A limiting groove and a limiting block structural schematic diagram in a power coal conversion coking coal flotation and impurity removal device is provided in the embodiments of the present application.

[0023] Wherein: 1 - the impurity removal box, 11 - support leg, 12 - the impurity pipe, 2 - the top plate, 3 - the vertical cylinder, 4 - the stirring rod, 5 - the rotating assembly, 51 - the positioning tooth ring, 52 - the fixed frame, 53 - the motor, 54 - the transmission gear disc, 6 - the bubble generating mechanism, 61 - the air guide assembly, 611 - the air guide cavity, 612 - the exhaust hole, 613 - the air guide pipe, 62 - the layered generating assembly, 621 - the sealing part, 6211 - the piston plate, 6212 - the sealing cylinder, 6213 - the support frame, 6214 - the extrusion spring, 622 - the driving part, 6221 - the air guide groove, 6222 - the bearing column, 6223 - the winding disc, 6224 - the pull rope, 6225 - the fixed gear disc, 6226 - the fixed ring, 6227 - the rack, 7 - the limiting groove, 8 - the limiting block, 9 - the scraper, 10 - the positioning groove. DETAILED DESCRIPTION

[0024] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0025] The specific implementation of the present application is described in detail below in combination with specific embodiments.

[0026] As shown in Figure 1 , Figure 2 , it is a structural diagram of a power coal conversion coking coal flotation impurity removal device provided by an embodiment of the present application, comprising an impurity removal box 1, the top end of the impurity removal box 1 is provided with an opening, the bottom wall of the impurity removal box 1 is fixedly installed with support legs 11 around, the bottom wall of the impurity removal box 1 is provided with an impurity pipe 12, the surface of the impurity pipe 12 is provided with a control valve, the top of the impurity removal box 1 is fixedly installed with a top plate 2 through a support, the top plate 2 and the inner bottom wall of the impurity removal box 1 are rotatably installed with a vertical cylinder 3, a plurality of groups of stirring rods 4 are fixedly installed on the surface of the vertical cylinder 3 at different heights in a ring-shaped distribution, the surface of the top plate 2 is provided with a rotating assembly 5 matched with the vertical cylinder 3, the rotating assembly 5 is used to control the vertical cylinder 3 to rotate around its own axis in the inner cavity of the impurity removal box 1, the surface of the vertical cylinder 3 is provided with a bubble generating mechanism 6, the bubble generating mechanism 6 comprises an air guide assembly 61 and a layered generating assembly 62, the air guide assembly 61 is connected with the stirring rod 4, the air guide assembly 61 is used to control the generation of bubbles on the surface of the stirring rod 4, the layered generating assembly 62 comprises a sealing part 621 and a driving part 622, the sealing part 621 is located in the inner cavity of the vertical cylinder 3, the driving part 622 is located at the inner bottom of the vertical cylinder 3 and is connected with the sealing part 621, the driving part 622 controls the stirring rods 4 at different heights to generate bubbles in turn through the matched mode with the sealing part 621.

[0027] In use, the coal powder slurry to be desulfurized is injected into the desulfurization box 1, and the flotation reagent is also put into the desulfurization box 1, the rotating assembly 5 controls the vertical cylinder 3 to rotate around its own axis in the inner cavity of the desulfurization box 1, the vertical cylinder 3 drives the plurality of stirring rods 4 to rotate synchronously in the inner cavity of the desulfurization box 1, and the stirring rod 4 can control the flotation reagent to fully mix with the slurry. In the stirring process, the air guide assembly 61 can control the bubbles to be generated on the surface of the stirring rod 4, the bubbles float upward in the slurry, and the bubbles can synchronously carry the coal powder particles in the slurry to the surface of the slurry when the bubbles float upward. The driving part 622 and the sealing part 621 cooperate with each other to control the bubbles to be generated on the surfaces of the stirring rods 4 at different heights in sequence, and the bubbles at different depths can fully contact the coal powder particles in the slurry when the bubbles move upward in the inner cavity of the desulfurization box 1, thereby effectively improving the adhesion effect of the bubbles on the coal powder particles and the flotation efficiency of the coal powder particles. In the flotation process, the gangue and other impurities are deposited at the bottom of the desulfurization box 1, and the impurities deposited at the bottom of the desulfurization box 1 can be conveniently discharged through the desulfurization pipe 12.

[0028] As shown in Figure 1 , Figure 2 , Figure 3 illustrated, as a preferred embodiment of the present application, the rotating assembly 5 comprises a positioning tooth ring 51 fixedly installed on the surface of the vertical cylinder 3 and located above the top plate 2, the top plate 2 is fixedly installed with a fixed frame 52 located outside the vertical cylinder 3, the fixed frame 52 is fixedly installed with a motor 53 on the surface, and the output shaft of the motor 53 is fixedly installed with a transmission gear disc 54, and the transmission gear disc 54 is in meshing connection with the positioning tooth ring 51.

[0029] In use, the motor 53 drives the transmission gear disc 54 to rotate, and the transmission gear disc 54 is in meshing transmission with the positioning tooth ring 51, so as to drive the vertical cylinder 3 to rotate around its own axis in the inner cavity of the desulfurization box 1.

[0030] As shown in Figure 1 , Figure 2 , Figure 3 , Figure 4 illustrated, as a preferred embodiment of the present application, the air guide assembly 61 comprises an air guide cavity 611 formed in the stirring rod 4, the air guide cavity 611 is in communication with the inner cavity of the vertical cylinder 3, a plurality of uniformly distributed air exhaust holes 612 are formed in the surface of the stirring rod 4 and are in communication with the air guide cavity 611, and the vertical cylinder 3 is movably connected with an air guide pipe 613 at the top end, and the end of the air guide pipe 61 away from the vertical cylinder 3 is connected with an external air pump.

[0031] Initially, the sealing part 621 controls the air guide cavity 611 to be closed towards one end of the vertical cylinder 3. When the vertical cylinder 3 drives the stirring rod 4 to stir the coal slurry, the air pump generates air which is delivered into the vertical cylinder 3 through the air guide pipe 61. The driving part 622 cooperates with the sealing part 621 to control the air guide cavities 611 at different heights to be switched to the through state in sequence. The air in the vertical cylinder 3 flows into the stirring rod 4 through the air guide cavities 611, and the air passing through the air exhaust holes 612 on the surface of the stirring rod 4 forms bubbles and is discharged into the coal slurry. The bubbles at different depths in the coal slurry move upward, and the bubbles can fully contact the coal particles in the slurry, effectively improving the adhesion effect of the bubbles on the coal particles, and further effectively improving the flotation efficiency of the coal particles.

[0032] As shown in Figure 2 , Figure 4 , Figure 5 , Figure 6 , Figure 7 illustrated, as a preferred embodiment of the present application, the sealing part 621 comprises a piston plate 6211 which is slidingly installed in the inner cavity of the vertical cylinder 3 in the vertical direction. The piston plate 6211 is fixedly installed with a sealing cylinder 6212 on the surface. The outer side wall of the sealing cylinder 6212 is in contact with the inner side wall of the vertical cylinder 3, and the sealing cylinder 6212 is slidingly connected with the vertical cylinder 3 in the vertical direction. The top end of the sealing cylinder 6212 is penetrated. The inner bottom wall of the impurity removal box 1 is fixedly installed with a support frame 6213 which is located in the inner cavity of the vertical cylinder 3. The support frame 6213 is fixedly installed with an extrusion spring 6214 on the surface. The extension end of the extrusion spring 6214 is connected with the piston plate 6211.

[0033] Initially, the extrusion spring 6214 applies an upward thrust to the piston plate 6211, and the piston plate 6211 supports and positions the sealing cylinder 6212 in the inner cavity of the vertical cylinder 3. The sealing cylinder 6212 closes the end of the air guide cavity 611 towards the vertical cylinder 3. When the vertical cylinder 3 drives the stirring rod 4 to rotate, the driving part 622 controls the piston plate 6211 and the sealing cylinder 6212 to move downward, thereby controlling the air guide cavities 611 at different depths to be switched to the through state in sequence. The air in the vertical cylinder 3 can be conveniently delivered into the stirring rod 4 at different heights through the air guide cavities 611 and further discharged. When the piston plate 6211 moves to the lowest position, the driving part 622 releases the pulling force on the piston plate 6211, and the extrusion spring 6214 pushes the piston plate 6211 and the sealing cylinder 6212 to move upward to the original position. This cycle is repeated several times, which can continuously control the stirring rod 4 surface at different heights to generate bubbles in sequence.

[0034] As shown in Figure 2 , Figure 5 , Figure 6 , Figure 7As shown in the drawings, as a preferred embodiment of the present application, the driving part 622 comprises a plurality of groups of air guide grooves 6221 on the surface of the sealing cylinder 6212, which cooperate with the air guide cavities 611. The distance between the air guide cavities 611 inside the plurality of groups of support legs 11 and the air guide grooves 6221 increases in turn from bottom to top. A bearing column 6222 is rotatably installed in the support frame 6213. A winding disc 6223 is fixedly installed on the surface of the bearing column 6222. A pulling rope 6224 is wound on the surface of the winding disc 6223. One end of the pulling rope 6224 away from the winding disc 6223 penetrates through the support frame 6213 and is connected with the piston plate 6211. One end of the bearing column 6222 extends to the outside of the support frame 6213 and is fixedly installed with a fixed tooth disc 6225. The inner cavity of the vertical cylinder 3 is fixedly installed with a fixed ring 6226 below the fixed tooth disc 6225 through a support. The fixed ring 6226 is fixedly installed with an arc-shaped rack 6227 on the surface. The rack 6227 is in meshing cooperation with the fixed tooth disc 6225.

[0035] When the vertical cylinder 3 rotates, the fixed ring 6226 and the rack 6227 rotate synchronously. When the rack 6227 is in contact with the fixed tooth disc 6225, the rack 6227 and the fixed tooth disc 6225 are in meshing transmission, which can drive the bearing column 6222 to rotate in the support frame 6213. The bearing column 6222 drives the winding disc 6223 to rotate synchronously. The winding disc 6223 winds the pulling rope 6224. The pulling rope 6224 pulls the piston plate 6211 to move vertically downward in the vertical cylinder 3. When the rack 6227 continuously rotates and is separated from the fixed tooth disc 6225, the rack 6227 releases the driving force of the fixed tooth disc 6225. The compression spring 6214 pushes the piston plate 6211 and the sealing cylinder 6212 to move reversely upward to the original position. In this way, the piston plate 6211 and the sealing cylinder 6212 can be controlled to move reciprocatingly in the vertical direction in the inner cavity of the vertical cylinder 3. The sealing cylinder 6212 drives the air guide grooves 6221 to move synchronously. When the air guide grooves 6221 coincide with the air guide cavities 611, the air guide cavities 611 are in a through state.

[0036] As shown in the drawings, Figure 4 , Figure 7 As a preferred embodiment of the present application, a plurality of limiting grooves 7 are formed on the inner side wall of the vertical cylinder 3. A limiting block 8 is fixedly installed on the surface of the sealing cylinder 6212. The limiting block 8 is in sliding connection with the limiting grooves 7 in the vertical direction.

[0037] When the sealing cylinder 6212 moves in the inner cavity of the vertical cylinder 3, the limiting block 8 moves synchronously in the limiting grooves 7. The limiting block 8 and the limiting grooves 7 cooperate with each other, which can effectively improve the stability of the sealing cylinder 6212.

[0038] As shown in the drawings, Figure 3As shown, as a preferred embodiment of the present application, the vertical cylinder 3 is fixedly installed with a scraper 9 cooperating with the inner bottom wall of the impurity removal box 1.

[0039] The vertical cylinder 3 drives the scraper 9 to rotate synchronously when rotating, and the scraper 9 pushes the impurities precipitated at the bottom of the impurity removal box 1 to move, so that the impurities can be automatically pushed into the impurity discharge pipe 12.

[0040] As shown, Figure 3 , Figure 6 As shown, as a preferred embodiment of the present application, the inner bottom wall of the impurity removal box 1 is provided with a ring-shaped positioning groove 10, and the bottom end of the vertical cylinder 3 is rotatably installed in the positioning groove 10. The rotation of the bottom end of the vertical cylinder 3 in the positioning groove 10 can effectively improve the stability of the rotation of the vertical cylinder 3.

[0041] The working principle of the present application is as follows: in use, the coal powder slurry that needs to be removed of impurities is injected into the impurity removal box 1, and the flotation reagent is also put into it, the motor 53 drives the transmission gear disc 54 to rotate, the transmission gear disc 54 is engaged with the positioning gear ring 51 to drive the vertical cylinder 3 to rotate around its axis in the inner cavity of the impurity removal box 1. The vertical cylinder 3 drives the plurality of stirring rods 4 to rotate synchronously in the inner cavity of the impurity removal box 1, and the stirring rods 4 can control the flotation reagent and the slurry to be fully mixed.

[0042] During the stirring process, the air pump generates gas and delivers it to the vertical cylinder 3 through the air guide pipe 61, the vertical cylinder 3 drives the fixed ring 6226 and the rack 6227 to rotate synchronously when rotating, when the rack 6227 is in contact with the fixed gear disc 6225, the rack 6227 is engaged with the fixed gear disc 6225 to drive the bearing column 6222 to rotate in the support frame 6213, the bearing column 6222 drives the winding disc 6223 to rotate synchronously, the winding disc 6223 winds the pulling rope 6224, and the pulling rope 6224 pulls the piston plate 6211 to move vertically downward in the vertical cylinder 3. When the rack 6227 continuously rotates and is separated from the fixed gear disc 6225, the rack 6227 releases the driving force on the fixed gear disc 6225, and the compression spring 6214 pushes the piston plate 6211 and the sealing cylinder 6212 to move reversely upward to the original position. In this way, the piston plate 6211 and the sealing cylinder 6212 can be controlled to reciprocate in the vertical direction in the inner cavity of the vertical cylinder 3. The sealing cylinder 6212 drives the air guide groove 6221 to move synchronously, and when the air guide groove 6221 coincides with the air guide cavity 611, the air guide cavity 611 is in a through state. The air guide cavities 611 at different heights are switched to the through state in turn, and the gas in the vertical cylinder 3 flows through the air guide cavities 611 to the stirring rods 4, the gas passes through the exhaust holes 612 on the surface of the stirring rods 4 to form bubbles and is discharged into the coal powder slurry, and the bubbles at different depths move upward in the coal powder slurry, so that the bubbles can fully contact with the coal powder particles in the slurry, effectively improving the adhesion effect of the bubbles on the coal powder particles, and further improving the flotation efficiency of the coal powder particles.

[0043] While the preferred embodiments of the application have been described above, it will be understood that many modifications and variations will be apparent to those skilled in the art, which do not depart from the true spirit and scope of the present application.

Claims

1. A flotation impurity removal device for converting thermal coal into coking coal, comprising an impurity removal box, an opening at the top of the impurity removal box, support legs fixedly installed around the bottom wall of the impurity removal box, a discharge pipe provided on the bottom wall of the impurity removal box, and a control valve provided on the surface of the discharge pipe, characterized in that... The top of the impurity removal box is fixedly installed with a top plate through a support, a vertical cylinder is rotatably installed between the top plate and the inner bottom wall of the impurity removal box, a plurality of groups of stirring rods in annular distribution are fixedly installed on the surface of the vertical cylinder at different heights; A rotating assembly matched with the vertical cylinder is arranged on the surface of the top plate, and the rotating assembly is used to control the rotation of the vertical cylinder around its own axis in the inner cavity of the impurity removal box; A bubble generating mechanism is arranged on the surface of the vertical cylinder, and the bubble generating mechanism comprises a gas guiding assembly and a layered generating assembly; The gas guiding assembly is connected with the stirring rod, and the gas guiding assembly is used to control the generation of bubbles on the surface of the stirring rod; The layered generating assembly comprises a sealing part and a driving part, the sealing part is located in the inner cavity of the vertical cylinder, the driving part is located on the inner bottom of the vertical cylinder and is connected with the sealing part, and the driving part controls the stirring rods at different heights to generate bubbles in sequence through cooperation with the sealing part.

2. The device for removing impurities from power coal by flotation according to claim 1, characterized in that, The rotating assembly comprises a positioning gear ring fixedly installed on the surface of the vertical cylinder and located above the top plate, a fixed frame fixedly installed on the surface of the top plate and located outside the vertical cylinder, a motor fixedly installed on the surface of the fixed frame, an output shaft of the motor fixedly installed with a transmission gear disc, and the transmission gear disc is engaged with the positioning gear ring.

3. The device for removing impurities from power coal by flotation according to claim 1, characterized in that, The gas guiding assembly comprises a gas guiding cavity opened in the stirring rod, the gas guiding cavity is communicated with the inner cavity of the vertical cylinder, a plurality of groups of evenly distributed air exhaust holes are opened on the surface of the stirring rod, the air exhaust holes are communicated with the gas guiding cavity, a gas guiding pipe is movably connected with the top end of the vertical cylinder, and one end of the gas guiding pipe away from the vertical cylinder is connected with an external air pump.

4. The device for removing impurities from power coal by flotation according to claim 3, characterized in that, The sealing part comprises a piston plate slidably installed in the inner cavity of the vertical cylinder along the vertical direction, a sealing cylinder fixedly installed on the surface of the piston plate, an outer side wall of the sealing cylinder matched with the inner side wall of the vertical cylinder, the sealing cylinder and the vertical cylinder slidably connected along the vertical direction, and the top end of the sealing cylinder penetrates through.

5. The device for removing impurities from power coal by flotation according to claim 4, characterized in that, The driving part comprises a plurality of gas guiding grooves opened on the surface of the sealing cylinder and matched with the gas guiding cavity, the distance between the gas guiding cavity and the gas guiding grooves in the plurality of support legs from bottom to top increases in sequence, a bearing column rotatably installed in the support frame, a winding disc fixedly installed on the surface of the bearing column, a pulling rope wound on the surface of the winding disc, one end of the pulling rope away from the winding disc penetrating through the support frame and connected with the piston plate, one end of the bearing column extending to the outside of the support frame and fixedly installed with a fixed gear disc, a fixed ring fixedly installed in the inner cavity of the vertical cylinder below the fixed gear disc, an arc-shaped gear rack fixedly installed on the surface of the fixed ring, and the gear rack engaged with the fixed gear disc.

6. The device for removing impurities from power coal by flotation according to claim 4, characterized in that, A plurality of limiting grooves are opened in the inner side wall of the vertical cylinder, a limiting block is fixedly installed on the surface of the sealing cylinder, and the limiting block and the limiting groove are slidably connected along the vertical direction.

7. The device for removing impurities from power coal by flotation according to claim 1, characterized in that, A scraper matched with the inner bottom wall of the impurity removal box is fixedly installed on the surface of the vertical cylinder.

8. The device for removing impurities from power coal by flotation according to claim 1, characterized in that, An annular positioning groove is opened in the inner bottom wall of the impurity removal box, and the bottom end of the vertical cylinder is rotatably installed in the positioning groove.

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