A coarse particle flotation machine

Abstract

The application discloses a coarse particle flotation machine, and particularly relates to the technical field of flotation machines, which comprises a flotation bin, a flotation mechanism, a driving mechanism, a scraping mechanism and a feeding mechanism, and further comprises a protection mechanism and a deposition treatment mechanism. Through the arrangement of the protection mechanism, the first jetting ports arranged in an inclined manner can spray upwardly moving rotating air flow to the inner wall of the flotation bin during the working process of the flotation machine. On the one hand, the coarse particles can be effectively reduced in deposition at the bottom or the corners, and when the coarse particles sink due to gravity, the upwardly moving rotating air flow can push the particles to move along a spiral track, prolong the residence time of the particles in the bubble enrichment area, and increase the collision frequency of the particles and the bubbles. On the other hand, the sprayed gas can form bubbles, the bubbles can collide with the coarse particles in the ore pulp, provide buoyancy for the upward floating of the coarse particles, reduce the deposition of the particles, and thus improve the recovery rate of the coarse particles and the flotation efficiency.

Description

Technical Field

[0001] This invention relates to the field of flotation machine technology, and more specifically, to a coarse particle flotation machine. Background Technology

[0002] A flotation machine, short for flotation mineral processing machine, refers to mechanical equipment that performs the flotation process. In a flotation machine, the slurry, after being treated with reagents, is agitated and aerated, causing some mineral particles to selectively adhere to the air bubbles; those that float to the surface are scraped off to form a froth product, while the rest remain in the slurry, thus achieving the purpose of mineral separation. There are many structural forms of flotation machines, the most common being the mechanically agitated flotation machine.

[0003] In existing flotation machines, when flotating coarse-grained minerals, the settling rate of these minerals is significantly higher than that of fine-grained minerals due to their large mass and inertia. This reduces the probability of effective collisions between particles and air bubbles, resulting in decreased flotation efficiency. Secondly, during impeller rotation, coarse particles are more significantly affected by centrifugal force due to their mass inertia, making them more likely to be thrown towards the sidewalls of the tank, further reducing their chances of collision as they not only escape the air bubble trapping zone but also accumulate at the bottom of the tank. This not only hinders slurry circulation but also directly rubs against the impeller blades, causing structural damage to the impeller and increasing maintenance costs.

[0004] This invention provides a coarse particle flotation machine, which aims to solve the problems of existing flotation machines when flotating coarse minerals. The coarse minerals have a high settling rate and are easily thrown against the side wall of the tank, resulting in a decrease in flotation efficiency, a shortened service life of the equipment, and increased maintenance costs due to the friction of the settled particles against the impeller blades. Summary of the Invention

[0005] The purpose of this invention is to provide a coarse particle flotation machine to solve the problems mentioned in the background art, such as the high settling rate of coarse minerals in existing flotation machines, which easily cause them to be thrown against the side wall of the tank, resulting in decreased flotation efficiency, shortened equipment service life, and increased maintenance costs due to the friction of settled particles against the impeller blades.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a coarse particle flotation machine, comprising a flotation chamber, a flotation mechanism, and a drive mechanism, wherein the flotation mechanism comprises a flotation tube, a drive shaft, a driven shaft, and a turntable, and further comprises:

[0007] Protective mechanisms are used to extend the suspension time of particles by spraying airflow;

[0008] A deposition treatment mechanism is used to automatically clean the particle deposits at the bottom of the flotation chamber according to the load changes of the drive mechanism.

[0009] Preferably, the protective mechanism includes:

[0010] The diversion pipe is connected to the flotation pipe;

[0011] Several first jet nozzles are obliquely disposed on the diversion pipe for injecting rotating and rising airflow into the inner wall of the flotation chamber.

[0012] The jet direction of the first jet nozzle is consistent with the rotation direction of the turntable.

[0013] Preferably, the deposition processing apparatus includes:

[0014] A ring sleeve is fixed to the inner wall of the flotation tube;

[0015] A ring-shaped electromagnet, fixed to the bottom of the ring sleeve;

[0016] A metal disc is fixed to the upper end of the driven shaft and is driven by the magnetic force of the annular electromagnet to adjust the height of the driven shaft.

[0017] Preferably, the deposition processing mechanism further includes:

[0018] A current sensor is used to detect the current of the drive mechanism.

[0019] Preferably, the lower part of the flotation tube has a variable diameter structure and is located on the moving path of the metal disk. When the metal disk moves upward, the air outlet cross-sectional area of ​​the lower part of the flotation tube is reduced.

[0020] Preferably, the deposition processing mechanism further includes:

[0021] The guide cylinder is fixed to the bottom of the flotation chamber and has a guide rod that is slidably connected to the inside and fixed to the diversion pipe;

[0022] The second jet nozzle is located on the side wall of the guide cylinder and is used to jet airflow toward the bottom of the turntable;

[0023] A sealing plug is used to close the second jet nozzle when the air pressure is insufficient.

[0024] Preferably, the sealing plug is connected to the guide cylinder via a second elastic element, and the sealing plug is released from the second jet nozzle when the air pressure in the diversion pipe increases.

[0025] Preferably, the deposition processing mechanism further includes:

[0026] A fixing rod, one end of which is fixedly connected to the communication port of the flotation tube;

[0027] A telescopic cylinder is fixed to the other end of the fixed rod;

[0028] The telescopic rod is slidably connected inside the telescopic cylinder and is fixedly connected to the top of the diversion pipe.

[0029] Preferably, the driven shaft is slidably connected to the drive shaft via a limiting rod, and the limiting rod is inserted into the limiting groove of the driven shaft.

[0030] Preferably, a first elastic element is provided between the metal disc and the drive shaft for resetting the driven shaft after the annular electromagnet is de-energized.

[0031] The technical effects and advantages of this invention are as follows:

[0032] 1. Through the design of the protective mechanism, this invention can spray an upward rotating airflow onto the inner wall of the flotation chamber through several inclined first jet nozzles during the operation of the flotation machine. On the one hand, this can effectively reduce the deposition of coarse particles at the bottom or corners, and when coarse particles sink due to gravity, the upward rotating airflow can push the particles along a spiral trajectory, prolonging their residence time in the bubble enrichment zone and increasing the collision frequency between particles and bubbles. On the other hand, the sprayed gas can form bubbles, which will collide with coarse particles in the slurry, providing buoyancy to make the coarse particles float, reducing particle deposition, thereby improving the recovery rate of coarse particles and the flotation efficiency.

[0033] 2. When excessive coarse slag accumulates at the bottom of the flotation chamber, this invention can detect the current of the drive mechanism motor through a current sensor, control the annular electromagnet to be energized, causing the driven shaft to drive the second flocculant plate and the turntable upwards, and adjust the downward air output of the flotation tube, thereby increasing the air pressure in the diversion pipe and pushing several sealing plugs to release the blockage of several second air jets, allowing air to be sprayed from the second air jets to the bottom of the turntable, causing the deposited coarse slag at the bottom of the turntable to flow quickly, preventing excessive accumulation of coarse slag, avoiding the impact of coarse slag on the rotation of the turntable, and reducing the frequency of downtime maintenance. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0035] Figure 2 This is a top view of the internal structure of the flotation chamber of the present invention.

[0036] Figure 3 This is a schematic diagram of the flotation mechanism of the present invention.

[0037] Figure 4 This is a cross-sectional view of the internal structure of the flotation tube of the present invention.

[0038] Figure 5 For the present invention Figure 4 Enlarged view of the structure of part A.

[0039] Figure 6 This is a schematic diagram of the protective mechanism and deposition treatment mechanism of the present invention.

[0040] Figure 7This is a cross-sectional view of the protective mechanism and deposition treatment mechanism of the present invention.

[0041] The attached figures are labeled as follows: 1. Flotation chamber; 2. Flotation mechanism; 201. Flotation tube; 202. Drive shaft; 203. Driven shaft; 204. Limiting rod; 205. Air inlet pipe; 206. First driven wheel; 207. Mounting frame; 208. Disc; 209. Air outlet; 210. First flocculant plate; 211. Turntable; 212. Second flocculant plate; 3. Drive mechanism; 4. Scraping mechanism; 5. Protective mechanism; 51. Diverter pipe; 52. 6. First jet nozzle; 6. Deposition treatment mechanism; 61. Ring sleeve; 62. Ring electromagnet; 63. Metal disc; 64. First elastic element; 65. Limiting groove; 66. Connecting port; 67. Fixing rod; 68. Telescopic cylinder; 69. Telescopic rod; 610. Guide rod; 611. Guide cylinder; 612. Second jet nozzle; 613. Sealing plug; 614. Second elastic element; 615. Limiting plate; 616. Vent hole; 7. Feeding mechanism. Detailed Implementation

[0042] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] Example 1

[0044] refer to Figures 1 to 7 An embodiment of the present invention provides a coarse particle flotation machine, comprising a flotation chamber 1, a flotation mechanism 2, a drive mechanism 3, a scraping mechanism 4, and a feeding mechanism 7.

[0045] refer to Figures 1 to 4 The flotation mechanism 2 is fixed to the top of the flotation chamber 1 by a crossbar and includes a flotation tube 201. A drive shaft 202 is provided inside the flotation tube 201. A driven shaft 203 is slidably connected to the lower end of the drive shaft 202. A limit rod 204 is provided between the drive shaft 202 and the driven shaft 203. An air filling pipe 205 is provided on the side end of the flotation tube 201.

[0046] The flotation mechanism 2 also includes a first driven wheel 206, which is rotatably connected to the flotation tube 201. The first driven wheel 206 is located at the upper end of the drive shaft 202. The top end of the flotation tube 201 is sealed. The drive shaft 202 rotates through the flotation tube 201. A mounting bracket 207 is provided on the outside of the flotation tube 201. A disc 208 is provided at the lower end of the flotation tube 201. An air outlet 209 is provided on the disc 208. A first bubble-breaking plate 210 is provided at the lower end of the disc 208. A turntable 211 is provided at the lower end of the driven shaft 203. A second bubble-breaking plate 212 is provided on the turntable 211. After the first driven wheel 206 rotates, it drives the drive shaft 202 to rotate. The rotation of the drive shaft 202 drives the rotation of the driven shaft 203 through the assistance of the limiting rod 204. The rotation of the driven shaft 203 drives the rotation of the turntable 211, thereby causing the second bubble-breaking plate 212 to rotate.

[0047] refer to Figure 1 The drive mechanism 3 is fixed to the top of the flotation chamber 1 by a support frame and is used to drive the first driven wheel 206 to rotate. The drive mechanism 3 is existing technology and will not be described in detail here.

[0048] The scraping mechanism 4 is located at the side of the flotation chamber 1. It is used to scrape the foam on the surface of the slurry into the feed trough by rotating the scraper. The scraping mechanism 4 is existing technology and will not be described in detail here.

[0049] The feeding mechanism 7 is used to add slurry into the flotation chamber 1. The feeding mechanism 7 is existing technology and will not be described in detail here.

[0050] In actual operation, the slurry is first fed into the feeding mechanism 7 by an external feeder, and then enters the flotation chamber 1. Then, the drive mechanism 3 is activated, which drives the first driven wheel 206 to rotate. The rotation of the first driven wheel 206 drives the drive shaft 202 to rotate. The rotation of the drive shaft 202, assisted by the limit rod 204, drives the driven shaft 203 to rotate, thereby causing the turntable 211 to rotate. Simultaneously, air is injected into the air filling pipe 205 through an external air filling device. The air in the air filling pipe 205 enters the flotation tube 201. Because the upper end of the flotation tube 201 is sealed, the air inside the flotation tube 201 will be drawn out by the flotation tube 201. The air is discharged from below the flotation tube 201. When the air is discharged from below the flotation tube 201, the rotation of the turntable 211 will drive the rotation of the second bubble-breaking plate 212. The rotation of the second bubble-breaking plate 212, in conjunction with the first bubble-breaking plate 210, will disperse the air discharged from below the flotation tube 201 and generate bubbles. Some of the gas is discharged through the air outlet 209. The bubbles discharged from the air outlet 209 will also coat the slag. The bubbles coated with slag will float upward under the action of buoyancy and form foam on the surface of the slurry. Then, the scraping mechanism 4 is activated to rotate the scraper and scrape the foam on the surface of the slurry into the feed trough, thus completing the flotation of the slag in the slurry.

[0051] Example 2

[0052] In actual use, when flotation machines are used to float coarse mineral particles, the settling rate of coarse mineral particles is significantly higher than that of fine mineral particles due to their large quantity and inertia. This results in a reduced probability of effective collision between particles and bubbles, leading to a decrease in flotation efficiency. Furthermore, during the rotation of the turntable 211, coarse particles are more significantly affected by centrifugal force due to their mass inertia, making them more likely to be thrown towards the side wall of the flotation chamber 1. This not only causes them to leave the bubble collection area but also further reduces the chance of collision. Therefore, this embodiment improves upon the device described in the above embodiment.

[0053] refer to Figure 2 , Figure 3 and Figure 6 It also includes a protective mechanism 5, which includes a diversion pipe 51 installed inside the flotation chamber 1. The diversion pipe 51 is connected to the flotation tube 201 through a fixed rod 67, a telescopic cylinder 68, and a telescopic rod 69. The diversion pipe 51 is located at the bottom of the flotation chamber 1 and is connected to the inside of the flotation tube 201. Several first air nozzles 52 for spraying air onto the inner walls of the flotation chamber 1 are evenly arranged on the diversion pipe 51. Each first air nozzle 52 is inclined and has the same angle, facing the rotation direction of the turntable 211.

[0054] In actual operation, the external aeration device injects air into the flotation tube 201 through the aeration pipe 205. Part of the air is discharged from the bottom of the flotation tube 201, and the other part enters the diversion pipe 51. Then, it is sprayed onto the inner wall of the flotation chamber 1 through several inclined first jet nozzles 52. By adjusting the air supply of the external aeration device, the jet volume of several first jet nozzles 52 can be adjusted simultaneously. The sprayed airflow will form a rotating airflow in the same direction as the turntable 211 along the inner wall of the flotation chamber 1 and flow upward. The upward rotating airflow can effectively reduce the deposition of coarse particles at the bottom or corners. When coarse particles sink due to gravity, the upward rotating airflow can push the particles along a spiral trajectory, prolonging their residence time in the bubble enrichment zone and increasing the collision frequency between particles and bubbles.

[0055] Meanwhile, the air ejected through several first jet nozzles 52 will be torn into bubbles by the slurry flow under the action of rotational shear force. These bubbles will collide with coarse particles in the slurry, providing buoyancy to make the coarse particles float, reducing particle deposition, thereby improving the recovery rate of coarse particles and flotation efficiency.

[0056] In summary, by setting up the protective mechanism 5, a rotating airflow moving upward can be sprayed onto the inner wall of the flotation chamber 1 through several inclined first jet nozzles 52 during the operation of the flotation machine. On the one hand, this can effectively reduce the deposition of coarse particles at the bottom or corners, and when coarse particles sink due to gravity, the rotating airflow moving upward can push the particles along a spiral trajectory, prolonging their residence time in the bubble enrichment zone and increasing the collision frequency between particles and bubbles. On the other hand, the sprayed gas can form bubbles, which will collide with coarse particles in the slurry, providing buoyancy to make the coarse particles float, reducing particle deposition, thereby improving the recovery rate of coarse particles and the flotation efficiency.

[0057] Example 3

[0058] In actual operation, the settled coarse slag particles tend to accumulate at the bottom of the flotation chamber 1, which not only hinders the circulation of slurry, but also directly rubs against the bottom of the turntable 211, causing structural damage to the turntable 211 and increasing maintenance costs. Therefore, this embodiment improves the device described in the above embodiment.

[0059] refer to Figures 2 to 7 It also includes a sedimentation treatment mechanism 6, which includes a ring 61 fixedly sleeved on the inner wall of the flotation tube 201. A ring electromagnet 62 is provided at the lower end of the ring 61. A metal disk 63 is provided at the upper end of the driven shaft 203. A first elastic element 64 is provided between the metal disk 63 and the drive shaft 202. A limiting rod 204 is fixed at the lower end of the drive shaft 202. A limiting groove 65 is provided at the upper end of the driven shaft 203. The limiting rod 204 is inserted into the limiting groove 65. When the ring electromagnet 62 is energized, the ring electromagnet 62 will generate a magnetic force. Under the influence of the magnetic force, the metal disk 63 will move towards the ring electromagnet 62, thereby causing the driven shaft 203 to move upward. The drive mechanism 3 is electrically connected to a current sensor. The current sensor is used to detect the current change when the drive mechanism 3 is working. When the current sensor detects that the current of the motor of the drive mechanism 3 exceeds the set threshold, it controls the ring electromagnet 62 to be energized.

[0060] refer to Figures 3 to 5 The lower part of the flotation tube 201 has a variable diameter structure and is located on the moving path of the metal disk 63. When the metal disk 63 moves upward, it reduces the air outlet cross-sectional area of ​​the lower part of the flotation tube 201, thereby reducing the downward air outlet volume of the flotation tube 201.

[0061] refer to Figure 3 and Figure 4 The flotation tube 201 has a connecting port 66 on its side wall. The connecting port 66 is located above the variable diameter structure. A fixed rod 67 is fixedly connected to the connecting port 66. A telescopic cylinder 68 is fixedly connected to the other end of the fixed rod 67. A telescopic rod 69 is slidably connected inside the telescopic cylinder 68. The other end of the telescopic rod 69 is fixedly connected to the top of the diverter tube 51. The telescopic rod 69 can slide up and down inside the telescopic cylinder 68.

[0062] refer to Figure 6 and Figure 7 A number of guide rods 610 are uniformly fixedly connected to the bottom of the diversion pipe 51. The bottom of the flotation chamber 1 is fixedly connected to a guide cylinder 611 with the same number of guide rods 610 and corresponding positions. Each guide rod 610 is slidably connected inside the corresponding guide cylinder 611. The outer wall of each guide cylinder 611 is provided with a second jet port 612 that communicates with the interior. Each second jet port 612 faces the direction of the second bubble breaking plate 212 and is inclined. The jet angle of the second jet port 612 can be adjusted by rotating the guide cylinder 611 according to the actual situation.

[0063] The top of each guide rod 610 is connected to the diversion pipe 51, and the bottom of each guide rod 610 is fixedly connected to a sealing plug 613 for blocking the corresponding second jet port 612. The inside of each guide cylinder 611 is fitted with a second elastic element 614. One end of each second elastic element 614 is connected to the bottom of the sealing plug 613, and the other end is connected to the bottom of the corresponding guide cylinder 611. The side wall of each guide rod 610 is fixedly connected to a limiting plate 615, which is located inside the guide cylinder 611. The side wall of each guide rod 610 has multiple vent holes 616 between the corresponding limiting plate 615 and the guide cylinder 611. In the initial state, each sealing plug 613 can block the corresponding second jet port 612, and the vent holes 616 cannot communicate with the corresponding second jet port 612. When the sealing plug 613 compresses the second elastic element 614 and moves downward, the vent holes 616 can communicate with the corresponding second jet port 612.

[0064] In actual operation, when the characteristics of the slurry change and excessive coarse slag is deposited at the bottom of the flotation chamber 1, the coarse slag will come into contact with the bottom of the turntable 211 and generate friction with it, increasing the rotational resistance of the turntable 211. This will cause the motor load of the drive mechanism 3 to increase, resulting in an increase in motor current. When the current sensor detects that the current of the motor of the drive mechanism 3 exceeds the set threshold, it controls the annular electromagnet 62 to be energized. After the annular electromagnet 62 is energized, it will generate magnetic force, which will drive the metal disk 63 to compress the first elastic element 64 and move it towards the annular electromagnet 62. This will cause the driven shaft 203 to drive the second bubble-breaking plate 212 and the turntable 211 to move upward. At this time, the bottom of the turntable 211 will no longer come into contact with the deposited coarse slag, and at the same time, it will avoid affecting the subsequent air jet flow of slag.

[0065] refer to Figure 5As the magnetic force drives the metal disk 63 to move towards the annular electromagnet 62, the metal disk 63 will move at the diameter change position of the flotation tube 201, from the large diameter area to the small diameter area, thereby adjusting the downward air output of the flotation tube 201. At this time, the air pressure above the diameter change area of ​​the flotation tube 201 increases. The increased air pressure will enter the diversion pipe 51 through the connecting port 66, the fixed rod 67, the telescopic cylinder 68, and the telescopic rod 69, and be ejected outward through several first air jets 52. Due to the increased air pressure, the several first air jets 52 cannot release all the increased air pressure. The increased air pressure will push several sealing plugs 613 to compress the second elastic element 614 and move it downward in the guide cylinder 611, causing the diversion pipe 51 to drive the telescopic rod 69. The telescopic cylinder 68 moves downward, causing several sealing plugs 613 to move down to below the corresponding second air nozzles 612, releasing the sealing of the second air nozzles 612 and allowing them to connect with the corresponding vents 616. At this time, excess air pressure in the diversion pipe 51 can be sprayed towards the bottom of the rotary table 211 through the guide rod 610, the vents 616, and the second air nozzles 612, causing the coarse slag deposited at the bottom of the rotary table 211 to flow quickly, preventing excessive deposition of coarse slag, avoiding the impact of coarse slag on the rotation of the rotary table 211, reducing the frequency of downtime maintenance, and compensating for the rotation of the rotary table 211 and the air output at the bottom of the flotation tube 201, thus avoiding too much impact on the normal operation of the flotation machine.

[0066] When the current sensor detects that the current of the drive mechanism 3 motor has returned to normal, the annular electromagnet 62 is de-energized. After the magnetic force of the annular electromagnet 62 disappears, the metal disk 63 and the driven shaft 203 will return to their initial positions under the pushing force of the first elastic element 64, so that the air output at the bottom of the flotation tube 201 returns to normal, and the air pressure in the diversion tube 51 returns to normal. Several sealing plugs 613 will return to their initial positions under the action of the corresponding second elastic element 614, and re-seal several second air jets 612.

[0067] It should be noted that after the increased air pressure causes the diversion pipe 51 to move downward, several first jet nozzles 52 can move downward with the diversion pipe 51, which can spray air onto the coarse mineral particles deposited around the flotation chamber 1, allowing the coarse mineral particles in the dead corners to flow, further improving the flotation effect and flotation efficiency.

[0068] In summary, by setting up the sedimentation treatment mechanism 6, when too much coarse slag is deposited at the bottom of the flotation chamber 1, the current sensor detects the current of the motor of the drive mechanism 3, controls the annular electromagnet 62 to be energized, so that the driven shaft 203 drives the second crushing plate 212 and the turntable 211 to move upward, and adjusts the downward air output of the flotation tube 201, so that the air pressure in the diversion pipe 51 increases, and pushes several sealing plugs 613 to release the blockage of several second air jets 612, so that air can be sprayed from the second air jets 612 to the bottom of the turntable 211, so that the coarse slag deposited at the bottom of the turntable 211 flows quickly, preventing excessive deposition of coarse slag, avoiding the impact of coarse slag on the rotation of the turntable 211, and reducing the frequency of downtime maintenance.

[0069] In conclusion, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A coarse particle flotation machine, comprising a flotation chamber (1), a flotation mechanism (2), and a drive mechanism (3), wherein the flotation mechanism (2) comprises a flotation tube (201), a drive shaft (202), a driven shaft (203), and a turntable (211), characterized in that, Also includes: Protective mechanism (5) is used to extend the suspension time of particles by airflow injection; A sedimentation treatment mechanism (6) is used to automatically clean the particle deposits at the bottom of the flotation chamber (1) according to the load change of the drive mechanism (3); The protective mechanism (5) includes: The diversion pipe (51) is connected to the flotation pipe (201); Several first jet nozzles (52) are inclinedly disposed on the diversion pipe (51) for injecting rotating upward airflow into the inner wall of the flotation chamber (1); The jet direction of the first jet nozzle (52) is consistent with the rotation direction of the turntable (211); The deposition processing unit (6) includes: A ring (61) is fixed to the inner wall of the flotation tube (201); A ring electromagnet (62) is fixed to the bottom of the ring sleeve (61); A metal disc (63) is fixed to the upper end of the driven shaft (203) and is driven by the magnetic force of the annular electromagnet (62) to adjust the height of the driven shaft (203); The deposition processing unit (6) also includes: A current sensor is used to detect the current of the drive mechanism (3); The lower part of the flotation tube (201) has a variable diameter structure and is located on the moving path of the metal disk (63). When the metal disk (63) moves upward, the gas outlet cross-sectional area of ​​the lower part of the flotation tube (201) is reduced. The deposition processing unit (6) also includes: The guide tube (611) is fixed to the bottom of the flotation chamber (1) and has a guide rod (610) that is fixed to the diversion pipe (51) inside. The second jet nozzle (612) is located on the side wall of the guide tube (611) and is used to jet airflow to the bottom of the turntable (211); A sealing plug (613) is used to close the second jet port (612) when the air pressure is insufficient.

2. The coarse particle flotation machine according to claim 1, characterized in that: The sealing plug (613) is connected to the guide cylinder (611) through the second elastic element (614) and releases the sealing plug on the second jet port (612) when the air pressure in the diversion pipe (51) increases.

3. The coarse particle flotation machine according to claim 2, characterized in that: The deposition processing unit (6) also includes: One end of the fixed rod (67) is fixedly connected to the communication port (66) of the flotation tube (201); Telescopic cylinder (68) is fixed to the other end of the fixed rod (67); The telescopic rod (69) is slidably connected inside the telescopic cylinder (68) and is fixedly connected to the top of the diversion pipe (51).

4. The coarse particle flotation machine according to claim 3, characterized in that: The driven shaft (203) is slidably connected to the drive shaft (202) via a limiting rod (204), and the limiting rod (204) is inserted into the limiting groove (65) of the driven shaft (203).

5. The coarse particle flotation machine according to claim 4, characterized in that: A first elastic element (64) is provided between the metal disk (63) and the drive shaft (202) for resetting the driven shaft (203) after the annular electromagnet (62) is de-energized.

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