A coal mine flotation device

Abstract

The present application relates to coal flotation technical field, specifically said is a kind of coal flotation device, including machine case, flotation column, flotation motor, scum plate, scraper motor and rotating piece, the structural form of flotation machine is many, the most commonly used is mechanical agitation type flotation machine, flotation machine in the process of agitating ore pulp and to the aeration in ore pulp, both will cause the fluctuation of liquid level above ore pulp, and the froth on the surface of ore pulp is scraped out using the form of scraper, fluctuating liquid level in the process of unstable contact with scraper, affect the adhesion of froth, not conducive to discharge, cause the decrease of mineral processing efficiency, and the dispersed splashing froth is easy to adhere to the rotating fixed position of scraper, while causing additional pollution of equipment, increase the probability of poor heat dissipation and jam of scraper rotating bearing part, affect the long-term stable operation of flotation machine.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of coal mine flotation, in particular to a coal mine flotation device. BACKGROUND

[0002] Flotation refers to using a surfactant capable of generating a large number of bubbles, namely a foaming agent. When air is introduced into water or air enters water due to agitation of water, the hydrophobic end of the surfactant is oriented to the air side of the bubble at the gas-liquid interface, and the hydrophilic end is still in the solution, forming a bubble; another surfactant (generally a cationic surfactant, also including a fatty amine) that plays a capturing role is adsorbed on the surface of solid ore powder. This adsorption has a certain selectivity depending on the properties of the mineral, and the basic principle is to use the crystal lattice defects on the surface of the crystal, and the hydrophobic end is partially inserted into the bubble, so that the bubble can carry the designated ore powder away during the flotation process, achieving the purpose of ore dressing.

[0003] Flotation is usually carried out using a flotation machine, which is a shortened form of a floating ore dressing machine, and refers to a mechanical device that completes the flotation process. In the flotation machine, the ore pulp treated by adding reagents is agitated and aerated, so that some ore particles are selectively fixed on the gas bubbles; float to the surface of the ore pulp and be scraped out to form a foam product, and the remaining part is retained in the ore pulp to achieve the purpose of separating minerals. There are many structural forms of flotation machines, and the most commonly used is a mechanical stirring type flotation machine. The flotation machine causes the liquid surface above the stirred ore pulp and the aerated ore pulp to fluctuate, and the foam on the surface of the ore pulp is scraped out by a scraper. During the unstable contact between the fluctuating liquid surface and the scraper, the adhesion of the foam is affected, which is not conducive to the discharge, resulting in a decrease in the efficiency of ore dressing, and the dispersed and splashed foam is easily attached to the rotating and fixed part of the scraper. While causing additional pollution to the equipment, it also increases the probability of poor heat dissipation and jamming of the rotating bearing part of the scraper, affecting the long-term stable operation of the flotation machine. SUMMARY

[0004] In order to solve the problems of the prior art, the present application provides a coal mine flotation device, thereby solving the problems of the conventional flotation machine, such as the difficulty in removing the foam scraped by the fluctuation of the liquid surface of the ore pulp, the poor heat dissipation of the rotating part of the scraper caused by the splashing and sticking of the discharged foam, and the poor lubrication of the rotating part.

[0005] The technical scheme adopted by the present application to solve its technical problems is a coal mine flotation device, which comprises a machine box, a flotation column, a flotation motor, a foam scraping plate, a scraper motor and a rotating plate, the flotation column is rotatably installed in the machine box, the upper part of the machine box is fixedly installed with the flotation motor, the output shaft of the flotation motor is connected with the upper end of the flotation column through a first pulley transmission, the front part of the machine box is rotatably installed with a scraper shaft, the foam scraping plate is fixedly installed on the scraper shaft, the upper part of the machine box is fixedly installed with the scraper motor, the output shaft of the scraper motor is connected with one end of the scraper shaft through a second pulley transmission, the bottom of the flotation column is a disc surface, a plurality of adjusting holes are arranged on the circumference of the disc surface, and the rotating plate is fixedly installed in the adjusting hole.

[0006] Preferably, the machine box is provided with a feeding bin on one side of the flotation column, and a discharge bin is arranged in the machine box and located on the other side of the flotation column, the middle part of the feeding bin and the discharge bin is movably installed with a gate, the lower part of the flotation column is connected with the feeding bin through a feeding pipe, the middle part of the flotation column is fixedly installed with an air inlet pipe, and the outside of the machine box is fixedly installed with a turnover box.

[0007] Preferably, the foam scraping plate is close to the upper edge of the machine box, a plurality of distance adjusting plates are transversely installed on the foam scraping plate, and a waist-shaped groove fixedly connected with the scraper shaft is arranged on the distance adjusting plate.

[0008] Preferably, the machine box is fixedly installed with a shaft sleeve on both sides, the both ends of the scraper shaft are rotatably penetrated through the shaft sleeves on both sides, a hollow chamber is arranged on the outer edge of the shaft sleeve, and a gas distribution pipe is arranged on the machine box and connected with the inner cavity of the shaft sleeve.

[0009] Preferably, the end of the shaft sleeve facing the inner side of the machine box is provided with a conical slope, the included angle between the conical slope and the axis of the scraper shaft is an acute angle, a gas outlet hole is arranged on the position of the conical slope, and the port position of the gas outlet hole faces the outer wall of the scraper shaft.

[0010] Preferably, a pushing ring is fixedly installed on the end of the shaft sleeve, the pushing ring spirally surrounds the periphery of the scraper shaft, and the spiral direction of the pushing ring is opposite to the rotating direction of the shaft sleeve.

[0011] Preferably, a semicircular ring-shaped extension ring is arranged in the middle part of the distance adjusting plate, the end of the extension ring faces the plate surface of the foam scraping plate, a plurality of water permeable holes are uniformly arranged in the middle part of the bending position of the extension ring, a demulsification strip is rotatably installed on the end position of the extension ring, a plurality of demulsification holes are uniformly arranged on the side of the demulsification strip facing the foam scraping plate, and one end of the demulsification strip is connected with the inner cavity of the shaft sleeve through an air blowing pipe.

[0012] Preferably, the side of the defoaming strip facing the defoaming plate is a tapered structure with gradually narrowing width, the defoaming holes are located at the end of the tapered structure, the installation position of the defoaming strip is higher than the defoaming plate, and an inclination is maintained between the tapered side of the defoaming strip and the plate surface of the defoaming plate.

[0013] Preferably, the plate surface of the defoaming plate is uniformly provided with adsorption holes, the cross section of the adsorption hole is a tapered structure, and the adsorption hole position on the front side of the rotating direction of the defoaming plate is provided with a fan-shaped damping strip.

[0014] Preferably, the side edge of the defoaming plate is uniformly provided with elastic tentacles, one end of the tentacle is exposed to the defoaming plate, the upper side edge position of the cabinet is uniformly provided with a tooth block, the tooth block and the tentacle are one-to-one corresponding, the side of the tooth block facing the inner side of the cabinet is an arc structure, and the tentacle slides with the arc surface of the tooth block in the moving process.

[0015] The beneficial effects of the present application are:

[0016] (1) In the present application, the addition of the waist-shaped groove makes the spacing between the defoaming plate and the scraper shaft have a certain adjustable expansion space. In the process of floating different mineral materials, the number and size of bubbles will be different. By adjusting the actual installation position of the adjusting plate on the scraper shaft, the size of the circumferential path of the defoaming plate in the rotating process is changed, and then the depth of the defoaming plate immersed in the foam or mineral slurry is adjusted, so that the extraction and carrying separation of the foam are carried out at the appropriate depth position, the purity and discharge efficiency of the foam are improved, and the complexity of the later maintenance process is reduced by the quick installation and disassembly of the rotating piece in the adjusting hole.

[0017] (2) In the present application, the gas flow is introduced into the inner side of the shaft sleeve through the gas distribution pipe, which can carry away heat, reduce heat accumulation in the continuous rotating process, and prolong the service life of the internal bearing. By flowing out of the gas outlet hole, the cooling effect is realized, and at the same time, the bubbles or mineral slag adhering to the plate shaft are blown off to the center area of the cabinet, the self-cleaning of the scraper shaft is realized, the bubbles are concentrated, which is further beneficial to the subsequent foam scraping operation of the defoaming plate. The spiral pusher ring can prevent the increase of the weight of the scraper shaft caused by the solidification of the mineral slurry, or the decrease of the heat dissipation and lubrication effect, and improve the rotating stability and continuous service life of the defoaming plate.

[0018] (3) in the present application, by the gas spray of defoaming strip position, cooperate the centrifugal effect and inertia effect when the defoamer plate rotates, promote the falling rate of foam, by opening a plurality of adsorption holes, can promote the adhesion area and adhesion strength of foam, the damping strip set up, can increase the contact friction between foam and defoamer plate, promote the accumulation thickness of foam on the defoamer plate, increase the foam extraction amount, the tentacle set up, in the process of circumferential rotation, elastic collision contact between the tooth block, in turn make the defoamer plate produce short vibration, through the vibration effect, in the lifting adsorption hole smoothness, also can accelerate the falling rate of foam on the defoamer plate surface, in turn improve the flotation efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0019] The present application is further illustrated below in conjunction with the drawings and examples.

[0020] Figure 1 It is the first overall connection structure schematic diagram of the present application;

[0021] Figure 2 It is Figure 1 the enlarged schematic diagram of H in;

[0022] Figure 3 It is the second overall connection structure schematic diagram of the present application;

[0023] Figure 4 It is Figure 3 the overhead schematic diagram of;

[0024] Figure 5 It is the position relation schematic diagram between the flotation column and the air inlet pipe in the present application;

[0025] Figure 6 It is Figure 5 the enlarged schematic diagram of A in;

[0026] Figure 7 It is the position relation schematic diagram between the scraper shaft and the shaft sleeve in the present application;

[0027] Figure 8 It is Figure 7 the enlarged schematic diagram of B in;

[0028] Figure 9 It is the position relation schematic diagram between the distance adjusting plate and the defoamer plate in the present application;

[0029] Figure 10 It is Figure 9 the enlarged schematic diagram of C in;

[0030] Figure 11 It is Figure 9 the enlarged schematic diagram of D in;

[0031] In the figure:

[0032] 1, case; 2, flotation column; 3, flotation motor; 4, froth scraping plate; 5, scraping motor; 31, first pulley; 6, scraping shaft; 51, second pulley; 7, rotating piece; 21, adjusting hole; 11, guide impeller; 12, feed bin; 13, discharge bin; 14, gate; 22, feed pipe; 23, air inlet pipe; 15, turnover box; 41, distance adjusting plate; 42, waist type groove; 8, shaft sleeve; 16, air distribution pipe; 81, conical slope; 82, air outlet hole; 83, pushing ring; 43, extension ring; 431, water permeable hole; 44, defoaming strip; 441, defoaming hole; 45, air blowing pipe; 46, adsorption hole; 461, damping strip; 47, tentacle; 17, tooth block. DETAILED DESCRIPTION

[0033] In order to make the technical means, creative features, purposes and effects realized by the present application easy to understand, the present application is further described below in combination with specific embodiments.

[0034] The coal mine flotation device provided by the embodiment of the present application solves the problems of the traditional flotation machine, such as the decrease of the foam scraping efficiency caused by the fluctuation of the pulp liquid level, and the poor heat dissipation and poor lubrication of the rotating part caused by the splashing and sticking of the foam.

[0035] In order to reduce the negative interference caused by the fluctuation of the liquid level in the mineral flotation process, as shown in Figure 1 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 8 and Figure 9 , the preferred embodiment of the present application proposes a coal mine flotation device, which comprises a case 1, a flotation column 2, a flotation motor 3, a froth scraping plate 4, a scraping motor 5 and a rotating piece 7, the flotation column 2 is rotatably installed in the case 1, the upper part of the case 1 is fixedly installed with the flotation motor 3, the output shaft of the flotation motor 3 is in transmission connection with the upper end of the flotation column 2 through the first pulley 31, the front part of the case 1 is rotatably installed with the scraping shaft 6, the froth scraping plate 4 is close to the upper edge of the case 1, a plurality of distance adjusting plates 41 are transversely installed on the froth scraping plate 4, a waist type groove 42 is formed in the distance adjusting plate 41 and is fixedly connected with the scraping shaft 6, the upper part of the case 1 is fixedly installed with the scraping motor 5, the output shaft of the scraping motor 5 is in transmission connection with one end of the scraping shaft 6 through the second pulley 51, the bottom of the flotation column 2 is a disc surface, a plurality of adjusting holes 21 are formed in the circumferential direction of the disc surface, the rotating piece 7 is fixedly installed in the adjusting hole 21, the bottom of the case 1 is fixedly installed with the guide impeller 11, and the guide impeller 11 is located inside the circumferential installation position of the rotating piece 7.

[0036] The addition of the waist-shaped groove 42 makes the spacing between the skimmer plate 4 and the scraper shaft 6 have a certain adjustable expansion space. In the face of different mineral flotation processes, the number and size of the bubbles will be different. By adjusting the actual installation position of the adjusting plate 41 on the scraper shaft 6, the size of the circumferential path of the skimmer plate 4 in the rotating process is changed, and then the depth of the skimmer plate 4 immersed in the foam or the ore pulp is adjusted, so that the extraction and carrying separation of the foam are carried out at the appropriate depth position, and the purity and discharge efficiency of the foam are improved.

[0037] The quick installation and removal of the rotating piece 7 in the adjusting hole 21 reduces the complexity of the later maintenance process. When the rotating piece 7 is worn out, it can be replaced in time. In addition, the installation position of the rotating piece 7 is changed, so that the spacing between the rotating piece 7 and the guide impeller 11 is not fixed. The flow path of the ore pulp in the subsequent stirring process can be changed to be in an unstable state, avoiding the phenomenon that the middle liquid level of the ore pulp is low and the peripheral liquid level is high due to vortex, improving the average levelness of the upper liquid level of the ore pulp, and facilitating the foam scraping operation of the skimmer plate 4.

[0038] Further, in order to make the ore pulp and air fully contact and improve the generation amount of the flotation bubbles, as shown in Figures 3 to 5 and Figure 7 , the machine box 1 is provided with a feeding bin 12 located on one side of the flotation column 2, and a discharge bin 13 located on the other side of the flotation column 2. The middle part of the feeding bin 12 and the discharge bin 13 is movably installed with a gate 14. The lower part of the flotation column 2 is connected with the feeding bin 12 through a feeding pipe 22. The middle part of the flotation column 2 is fixedly installed with an air inlet pipe 23. The machine box 1 is fixedly installed with a turnover box 15 outside.

[0039] In work, the ore pulp and the stirring liquid are put in from the feeding bin 12. In the rotating process of the flotation column 2, the ore pulp is inhaled by the negative pressure. At the same time, air is introduced from the air inlet pipe 23. The air enters while carrying the ore pulp flow, and realizes the full mixing of the two. The circumferentially arranged rotating piece 7 can also disperse and push away the input high-density ore pulp while carrying out the secondary mixing of air and ore pulp, improving the smoothness of the entering bubbles. In the stirring process, the required minerals rise with the bubbles, and the bottom layer of the ore slag is uniformly discharged from the discharge bin 13, so as to realize continuous feeding and continuous flotation operation, and improve the efficiency of the whole flotation operation and the mineral processing intensity.

[0040] Further, in order to improve the smoothness and stability of the flotation operation and avoid the phenomenon that the ore slag splashes to cause poor heat dissipation or lubrication of the rotating part, as shown in Figure 2 , Figure 9 and Figure 11As shown, the two sides of the cabinet 1 are fixedly installed with shaft sleeves 8, the two ends of the scraper shaft 6 are respectively rotatably penetrated through the two sides of the shaft sleeves 8, the outer edge position of the shaft sleeve 8 is provided with a hollow chamber, and the cabinet 1 is provided with a gas distribution pipe 16 connected with the inner cavity of the shaft sleeve 8, the end of the shaft sleeve 8 facing the inner side of the cabinet 1 is provided with a tapered slope 81, the included angle between the tapered slope 81 and the axis of the scraper shaft 6 is an acute angle, the tapered slope 81 is circumferentially provided with a gas outlet hole 82, and the port position of the gas outlet hole 82 faces the outer wall of the scraper shaft 6, and the end of the shaft sleeve 8 is fixedly installed with a pushing ring 83, the pushing ring 83 is spirally wrapped around the outer periphery of the scraper shaft 6, and the spiral direction of the pushing ring 83 is opposite to the rotating direction of the shaft sleeve 8.

[0041] In work, by sleeving the shaft sleeve 8 on the end of the scraper shaft 6, unnecessary vibration or swing of the scraper shaft 6 caused by the impact of the ore pulp can be reduced, the rotation path circumference of the scraper 4 can be improved, and the uniformity of the scraping can be improved. In addition, by using the gas distribution pipe 16 to introduce airflow into the inner side of the shaft sleeve 8, heat can be removed, heat accumulation during continuous rotation can be reduced, and the service life of the internal bearing can be improved. The setting of the tapered slope 81 can further block the adhesion flow path of the ore pulp or bubbles, further improve the cleanliness of the bearing connection position of the scraper shaft 6, and further facilitate the subsequent foam scraping operation of the scraper 4. The spiral pushing ring 83 can uniformly push the bubbles carried by the ore pulp flow to the inner side of the scraper 4 outward during the self-rotation of the scraper shaft 6 through the spiral characteristics of the pushing ring 83. Through the rotating contact action between the pushing ring 83 and the outer wall of the scraper shaft 6, the phenomenon of increased weight of the scraper shaft 6 caused by ore pulp solidification or decreased heat dissipation and lubrication effect can be prevented, and the rotation stability and continuous service life of the scraper 4 can be improved.

[0042] Further, by mechanically scraping the foam from the ore pulp, it is difficult to improve the falling rate of the foam by only the centrifugal action in the circumferential rotation process, resulting in a low amount of foam extraction in a single scraping process and a low scraping efficiency. Therefore, like Figure 2 、 Figure 8 、 Figure 9 and Figure 11As shown, the middle part of the distance plate 41 is provided with a semi-circular ring-shaped extension ring 43, the end of the extension ring 43 faces the plate surface of the foam scraping plate 4, the middle part of the bending position of the extension ring 43 is uniformly provided with a water permeable hole 431, the end of the extension ring 43 is rotatably installed with a defoaming strip 44, the side of the defoaming strip 44 facing the foam scraping plate 4 is uniformly provided with a defoaming hole 441, and one end of the defoaming strip 44 is connected with the inside cavity of the shaft sleeve 8 through the air blowing pipe 45. The side of the defoaming strip 44 facing the foam scraping plate 4 is a tapered structure with gradually narrowing width, the defoaming holes 441 are located at the end position of the tapered structure, the installation position of the defoaming strip 44 is higher than the foam scraping plate 4, and the tapered side of the defoaming strip 44 is inclined to the plate surface of the foam scraping plate 4.

[0043] When the foam scraping plate 4 rotates circumferentially and carries the foam away from the ore pulp, the air flow is intermittently introduced into the inside of the defoaming strip 44 through the air blowing pipe 45. When the air flow passes through the defoaming hole 441, the flow rate is increased due to the narrowing of the flow channel, and is inclined to blow above the plate surface of the foam scraping plate 4. In combination with the centrifugal effect and inertial effect when the foam scraping plate 4 rotates, the falling rate of the foam is improved. In addition, through the tapered port design of the defoaming strip 44, the backflow phenomenon of the ore pulp or the foam can be prevented, the smoothness of the gas outlet channel is improved, and the water permeable hole 431 provided in the middle part of the extension ring 43 can facilitate the flow and discharge of the ore pulp.

[0044] Further, in order to improve the carrying extraction amount of the foam scraping plate 4 to the foam, as shown in Figure 9 and Figure 10 As shown, the plate surface of the foam scraping plate 4 is uniformly provided with an adsorption hole 46, the cross section of the adsorption hole 46 is a tapered structure, the positions of the adsorption holes 46 on the front side of the rotating direction of the foam scraping plate 4 are provided with fan-shaped damping strips 461, the side edges of the foam scraping plate 4 are uniformly installed with elastic tentacles 47, one end of the tentacle 47 is exposed to the foam scraping plate 4, the upper side edge positions of the cabinet 1 are uniformly provided with tooth blocks 17, the tooth blocks 17 correspond to the tentacles 47 one by one, the side of the tooth block 17 facing the inside of the cabinet 1 is an arc-shaped structure, and the tentacles 47 slide with the arc-shaped surface of the tooth block 17 in the moving process.

[0045] In operation, the foam adhesion area and strength are increased by the plurality of adsorption holes 46, the contact friction between the foam and the foam scraping plate 4 is increased by the damping strip 461, the foam accumulation thickness on the foam scraping plate 4 is increased, the mineral slurry extracted along with the foam can drip and leak from the adsorption hole 46 position to the rear, back into the cabinet 1 for secondary flotation, the foam is discharged by the gas injection from the defoaming strip 44 position when the bubble is rotated to the predetermined height position range above the turnover box 15, the tentacle 47 is elastically collided and contacted with the tooth block 17 in the circumferential rotation process, the foam scraping plate 4 is temporarily vibrated, the adsorption hole 46 smoothness is improved, the foam scraping plate 4 surface foam shedding rate is accelerated, and the flotation efficiency is improved.

[0046] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above embodiments, and the above embodiments and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the present application. The scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A coal mine flotation device, comprising a housing (1), a flotation column (2), a flotation motor (3), a skimmer (4), and a scraper motor (5), wherein the flotation column (2) is rotatably installed inside the housing (1), the flotation motor (3) is fixedly installed on the upper part of the housing (1), the output shaft of the flotation motor (3) is connected to the upper end of the flotation column (2) via a first pulley (31), a scraper shaft (6) is rotatably installed on the front part of the housing (1), the skimmer (4) is fixedly installed on the scraper shaft (6), the scraper motor (5) is fixedly installed on the upper part of the housing (1), and the output shaft of the scraper motor (5) is connected to one end of the scraper shaft (6) via a second pulley (51), characterized in that, Also includes Rotating plate (7), the bottom of the flotation column (2) is a disk surface, and multiple sets of adjustment holes (21) are opened in the circumferential direction of the disk surface. The rotating plate (7) is fixedly installed in the adjustment holes (21). A guide impeller (11) is fixedly installed at the bottom of the casing (1). The guide impeller (11) is located inside the rotating plate (7) arranged in the circumferential direction. The scraper plate (4) is located near the upper edge of the chassis (1). Multiple adjusting plates (41) are horizontally installed on the scraper plate (4). The adjusting plates (41) have waist-shaped grooves (42) that are fixedly connected to the scraper shaft (6). Both sides of the chassis (1) are fixedly installed with bushings (8), and the two ends of the scraper shaft (6) rotate through the bushings (8) on both sides respectively. A hollow cavity is provided at the outer edge of the bushing (8), and an air distribution pipe (16) connected to the inner cavity of the bushing (8) is installed on the chassis (1). The end of the bushing (8) is fixedly installed with a pusher ring (83), which is spirally wrapped around the periphery of the scraper shaft (6), and the spiral direction of the pusher ring (83) is opposite to the rotation direction of the bushing (8). The middle part of the adjusting plate (41) is provided with a semi-circular extension ring (43), the end of the extension ring (43) faces the surface of the shaving plate (4), and water permeable holes (431) are evenly opened in the middle of the bending position of the extension ring (43). A defoaming strip (44) is rotatably installed at the end of the extension ring (43). A defoaming hole (441) is evenly opened on the side of the defoaming plate (4) facing the shaving plate (4), and one end of the defoaming strip (44) is connected to the inner cavity of the bushing (8) through the blower pipe (45). The side of the slag scraper (4) is uniformly equipped with elastic tentacles (47), one end of each tentacle (47) is exposed outside the slag scraper (4). Tooth blocks (17) are uniformly arranged on the upper side of the chassis (1). The tooth blocks (17) correspond one-to-one with the tentacles (47). The side of the tooth block (17) facing the inside of the chassis (1) is an arc-shaped structure. The tentacles (47) slide in contact with the arc-shaped surface of the tooth block (17) during movement.

2. The coal mine flotation device according to claim 1, characterized in that: The machine casing (1) is provided with a feed hopper (12), which is located on one side of the flotation column (2). The machine casing (1) is provided with a discharge hopper (13), which is located on the other side of the flotation column (2). Gates (14) are movably installed in the middle of both the feed hopper (12) and the discharge hopper (13). The lower part of the flotation column (2) is connected to the feed hopper (12) through the feed pipe (22). An air inlet pipe (23) is fixedly installed in the middle of the flotation column (2). A turnover box (15) is fixedly installed outside the machine casing (1).

3. A coal mine flotation device according to claim 2, characterized in that: The end of the bushing (8) facing the inner side of the casing (1) is provided with a tapered inclined surface (81). The angle between the tapered inclined surface (81) and the axis of the scraper shaft (6) is an acute angle. An air outlet (82) is provided circumferentially at the position of the tapered inclined surface (81), and the port of the air outlet (82) faces the outer wall of the scraper shaft (6).

4. A coal mine flotation device according to claim 3, characterized in that: The side of the demister (44) facing the demister plate (4) is a tapered structure with a gradually narrowing width. The demister holes (441) are all located at the end of the tapered structure. The demister (44) is installed higher than the demister plate (4), and the tapered side of the demister (44) is inclined to the surface of the demister plate (4).

5. A coal mine flotation device according to claim 1, characterized in that: The surface of the scum scraper (4) is uniformly provided with adsorption holes (46). The cross-section of the adsorption hole (46) is a conical structure. A fan-shaped damping strip (461) is provided above the adsorption hole (46) on the scum scraper (4). The fan-shaped damping strip (461) is located on the side close to the tentacle (47).

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