Powder winnowing device

Abstract

According to the powder winnowing device, the draught fan is arranged to serve as an air source, the roughing bin connected with the draught fan is arranged to preliminarily sort large particles in materials so as to improve the separation degree of follow-up materials, the sorting bin connected with the roughing bin is arranged, and the materials obtained after roughing are transferred into the sorting bin to be sorted through separation; finally, the separated airflow is discharged into a cyclone separator to separate dust, the separated gas is circulated into a fan, through cooperative use of the equipment, the negative electrode material is subjected to wind separation, the separated airflow is circulated into the fan to repeat the winnowing process, and the device has the characteristics that the separation effect is improved, and the device is suitable for popularization and application. In addition, due to the fact that winnowing air is recycled, the defects of material waste and dust pollution caused by the fact that fine particles are discharged along with airflow in the traditional winnowing process are overcome.

Description

Technical Field

[0001] The present application relates to the technical field of material classification, and in particular to a powder air separation device. Background Art

[0002] At present, lithium-ion secondary batteries mainly use graphite powder as the negative electrode material of their conductive negative electrode, and its particle size is usually between 3μm and 30μm. In practical applications, in order to meet different process requirements, graphite needs to be graded according to different particle sizes.

[0003] The method currently used in the technology is to set screens of different mesh sizes on the vibrating screen, and the screen will screen out particles smaller than the set mesh size, thereby grading the graphite. However, the vibrating screen screening requires frequent observation of the screen to prevent the screen from being damaged and causing coarse material contamination. The labor intensity of the operator is high, and the vibrating screen screening has the disadvantages of long screening time and low screening efficiency. Therefore, there is also the use of wind selection to separate the graphite material, but in the wind selection process, some fine particles have a small specific gravity and a slow sedimentation rate, and will be discharged with the airflow, which not only causes material waste, but also causes dust pollution. Utility Model Content

[0004] The present application provides a powder air separation device to solve the problems of material waste and dust pollution caused by fine particles being discharged with the air flow during the existing air separation process of negative electrode materials.

[0005] The present application provides a powder air separation device, comprising a fan, wherein the output end of the fan is sequentially connected to a roughing bin, a separation bin and a cyclone separator;

[0006] The output end of the cyclone separator is also connected to the input end of the fan through a pipeline;

[0007] A wind selection channel is vertically arranged in the rough selection bin, the upper end of which is connected to the input end of the upper part of one side of the selection bin, and the lower end is connected to the output end of the fan;

[0008] A hopper is also provided on the top of the rough selection bin, which is connected to the air selection channel through a feed channel, and the bottom of the rough selection bin is also connected to the coarse material collecting bin through a heavy material discharge channel.

[0009] Optionally, a material inlet connected to the air selection channel is provided at the upper portion of one side of the sorting bin, and a material selection air outlet is provided at the side opposite to the material inlet;

[0010] At least one collecting bin is arranged at the bottom of the sorting bin along the flow direction of the separation air;

[0011] A filter is also provided on the collection bin;

[0012] Filter tilt setting.

[0013] Optionally, a roller is provided in the sorting bin, and the top of the roller is tangent to the lower edge of the feed inlet;

[0014] The rotation direction of the drum is the same as the flow direction of the separation air. A scraper is arranged on the inner wall of the sorting bin below the drum, and the scraper is in contact with the surface of the drum.

[0015] Optionally, a downwardly convex wind plate is provided in the sorting bin; the wind plate is close to the upper edge of the feed inlet;

[0016] The wind plate includes a curved portion and an inclined portion. The curved portion of the wind plate is located above the drum and the curvature matches the drum. The inclined portion of the wind plate is smoothly connected to the curved portion. One end of the inclined portion is connected to the curved portion, and the other end extends obliquely upward and is connected to the top of the sorting bin.

[0017] Optionally, the hopper includes an upper hopper portion and a lower feed pipe, and a rotary feeder is arranged in the feed pipe of the hopper along the horizontal direction;

[0018] The rotary feeder is rotatably connected to the feeder pipe.

[0019] Optionally, the rotary feeder includes a rotating shaft, which passes through a side wall of the feeder tube and is connected to a motor;

[0020] A plurality of blades are arranged on the outer periphery of the rotating shaft, and the blades are extended along the length direction of the rotating shaft;

[0021] One side of the paddle is fixedly connected to the rotating shaft, and the other end is close to the inner wall of the feeding pipe.

[0022] Optionally, a brush is provided on one side of the paddle blade close to the inner wall of the discharge pipe.

[0023] The present application provides a powder air separation device, which sets a fan as an air source, and sets a roughing bin connected to the fan to preliminarily separate large particles in the material to improve the separation degree of subsequent materials, and sets a separation bin connected to the roughing bin, and transfers the roughed material into the separation bin for separation, and finally discharges the separated airflow into a cyclone separator to separate dust, and circulates the separated gas into the fan again. The device of the present application, through the coordinated use of the above-mentioned equipment, performs wind separation on the negative electrode material, and circulates the separated airflow into the fan to repeat the air separation process, which has the characteristics of improving the separation effect and reducing the air separation, and because the air separation air is recycled in the present application, the disadvantages of material waste and dust pollution caused by the discharge of fine particles with the airflow in the traditional air separation process are overcome. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 A schematic diagram of the three-dimensional structure of a powder air separation device provided in one embodiment of the present application;

[0026] Figure 2 A schematic diagram of the internal structure of a powder air separation device provided in one embodiment of the present application;

[0027] Figure 3 A schematic diagram of the internal structure of a powder air separation device provided in another embodiment of the present application;

[0028] Figure 4 A schematic diagram of the structure of a rotary feeder provided in one embodiment of the present application;

[0029] Figure 5 A schematic structural diagram of a rotary feeder provided in another embodiment of the present application.

[0030] Description of reference numerals:

[0031] 1. Fan; 2. Rough selection bin; 3. Sorting bin; 4. Cyclone separator; 21. Hopper; 22. Rough material collecting bin; 31. Collecting bin; 32. Filter; 33. Roller; 34. Scraper; 35. Wind plate; 201. Wind selection channel; 202. Feed channel; 203. Heavy material discharge channel; 211. Rotary feeder; 301. Feed inlet; 302. Material selection air outlet; 2111. Rotating shaft; 2112. Paddle; 2113. Brush. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application is clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work also fall within the scope of protection of the present application.

[0033] like Figure 1 As shown, the present application provides a powder air separation device, comprising a fan 1, the output end of the fan 1 is connected to a roughing bin 2, a separation bin 3 and a cyclone separator 4 in sequence;

[0034] The output end of the cyclone separator 4 is also connected to the input end of the fan 1 through a pipeline;

[0035] A wind selection channel 201 is vertically arranged in the rough selection bin 2, the upper end of the wind selection channel 201 is connected to the input end of the upper part of one side surface of the selection bin 3, and the lower end is connected to the output end of the fan 1;

[0036] A hopper 21 is also provided on the top of the roughing bin 2 , and the hopper 21 is connected to the air selection channel 201 through the feeding channel 202 . The bottom of the roughing bin 2 is also connected to the rough material collecting bin 22 through the heavy material discharge channel 203 .

[0037] In the present application, the air selection channel 201 is arranged in a zigzag shape, which can buffer the air flow rate supplied by the fan 1, so that a better separation effect can be achieved in the rough selection bin 2.

[0038] When in use, the fan 1 is started to blow air to the roughing bin 2 , and at the same time, the negative electrode material to be air-selected is added to the hopper 21 above the roughing bin 2 , and then transferred to the feeding channel 202 .

[0039] The material falls from the feed channel 202 into the air separation channel 201, and the wind blown from the fan 1 contacts the material from bottom to top through the air separation channel 201. The particles with heavier specific gravity in the material (whose gravity is greater than the lifting force provided by the air separation wind) will fall and then be discharged from the heavy material discharge channel 203 and fall into the coarse material collection bin 22 for temporary storage. After rough selection in the coarse selection bin 2, the material will enter the sorting bin 3 through the upper end of the air separation channel 201 along with the air separation wind.

[0040] Since the material blown into the sorting bin 3 by the winnowing wind moves forward with the winnowing wind and has a certain initial velocity, the speeds of the particles entering the sorting bin 3 are different due to their different particle sizes. The speed of large particles is low, while the speed of small particles is relatively large. The path they travel in the sorting bin 3 is also relatively long, thereby separating the material by winnowing.

[0041] The dust-laden airflow (in which the particles are even finer) discharged from the sorting bin 3 enters the cyclone separator 4 for separation, and the separated dust is collected, while the discharged airflow enters the fan 1 through a pipeline from the gas output end of the cyclone separator 4 for circulation, thereby improving the air selection efficiency and reducing the escape of dust, thereby playing a role in protecting the environment.

[0042] The present application provides a powder air separation device, which sets a fan 1 as an air source, and sets a roughing bin 2 connected to the fan 1 to preliminarily separate large particles in the material to improve the separation degree of subsequent materials, and sets a separation bin 3 connected to the roughing bin 2, and transfers the rough-separated material into the separation bin 3 for separation, and finally discharges the separated airflow into a cyclone separator 4 to separate dust, and the separated gas is recycled into the fan 1. The device of the present application, through the coordinated use of the above-mentioned equipment, performs wind separation on the negative electrode material, and recycles the sorted airflow into the fan 1 to repeat the air separation process, which has the characteristic of improving the separation effect. In addition, because the air separation air is recycled in the present application, the disadvantages of material waste and dust pollution caused by the discharge of fine particles with the airflow in the traditional air separation process are overcome.

[0043] like Figure 2 and Figure 3 As shown, optionally, an inlet 301 communicating with the air selection channel 201 is provided at the upper portion of one side of the sorting bin 3, and a material selection air outlet 302 is provided at the opposite side of the inlet 301;

[0044] At least one collecting bin 31 is provided at the bottom of the sorting bin 3 along the flow direction of the separation air;

[0045] The collection bin 31 is also provided with a filter screen 32;

[0046] The filter screen 32 is arranged at an inclination.

[0047] Since the materials blown into the sorting bin 3 by the wind selection wind move forward with the wind selection wind and thus have a certain initial velocity, their speeds are different due to the different particle sizes when entering the sorting bin 3. The large particles have a low speed and fall into the collection bin 31 near the feed port 301, while the small particles have a relatively high speed and travel a relatively long path in the sorting bin 3, so they fall into the collection bin 31 far away from the feed port 301. The filter screen 32 arranged above the collection bin 31 can intercept large particles and prevent some of the larger particles from falling into the collection bin 31. In order to prevent the filter screen from being blocked, a vibrator can be arranged on the side of the sorting bin 3 to shake off the material dust deposited on the filter screen. In the present application, the mesh size of the filter screen 32 decreases successively along the blowing direction of the wind selection wind.

[0048] like Figure 2 and Figure 3 As shown, optionally, a roller 33 is provided in the sorting bin 3, and the top of the roller 33 is tangent to the lower edge of the feed inlet 301;

[0049] The rotation direction of the drum 33 is the same as the flow direction of the separation air. A scraper 34 is provided on the inner wall of the sorting bin 3 below the drum 33 , and the scraper 34 is in contact with the surface of the drum 33 .

[0050] In the present application, since a roller 33 is provided below the sorting bin 3, the roller 33 not only disperses the materials, but also guides the airflow due to its curved surface, so that large particles of materials can fall into the collection bin 31 near the feed port 301 more quickly. Since the roller 33 rotates under the drive of the power device connected thereto (a motor in the present application, connected and driven by a pulley or a sprocket), the materials falling on the roller 33 will be scraped off by the scraper 34 during the rotation of the roller 33.

[0051] like Figure 2 and Figure 3 As shown, optionally, a downwardly convex wind plate 35 is provided in the sorting bin 3; the wind plate 35 is close to the upper edge of the feed inlet 301;

[0052] The wind plate 35 includes a curved portion and an inclined portion. The curved portion of the wind plate 35 is located above the drum 33 and the curvature matches the drum 33. The inclined portion of the wind plate 35 is smoothly connected to the curved portion. One end of the inclined portion is connected to the curved portion, and the other end extends obliquely upward and is connected to the top of the sorting bin 3.

[0053] A downwardly convex arc-shaped wind plate 35 (with a curvature matching that of the drum 33) is provided on the upper part of the feed port 301. This shape will reduce the cross-section at the entrance and increase the airflow velocity, so that the material can have a longer falling distance, thereby improving the separation degree of materials of different particle sizes. In addition, since the inclined portion of the wind plate 35 plays a guiding role, the fine particles of the material can have a farther distance under the guidance of the wind plate 35 due to their small particle size and low specific gravity, and can be discharged from the material selection air outlet 302 of the sorting bin 3.

[0054] like Figure 3 and Figure 4 As shown, optionally, the hopper 21 includes an upper hopper portion and a lower feed pipe, and a rotary feeder 211 is arranged in the feed pipe of the hopper 21 along the horizontal direction;

[0055] The rotary feeder 211 is rotatably connected to the feeder pipe.

[0056] In the present application, the rotary feeder 211 is provided to realize batch feeding.

[0057] like Figure 4 As shown, optionally, the rotary feeder 211 includes a rotating shaft 2111, and the rotating shaft 2111 passes through the side wall of the feeder tube and is connected to the motor;

[0058] A plurality of blades 2112 are disposed on the outer periphery of the rotating shaft 2111, and the blades 2112 are extended along the length direction of the rotating shaft 2111;

[0059] One side of the paddle 2112 is fixedly connected to the rotating shaft 2111 , and the other end is close to the inner wall of the discharge pipe.

[0060] Start the power device (a motor in this application) connected to the rotary feeder 211 to drive the rotating shaft 2111 of the rotary feeder 211 to rotate, thereby driving the paddle 2112 to rotate. During the rotation process, the paddle 2112 transfers the material to be air-selected into the feed channel 202 in batches, while preventing the wind in the air-selection channel 201 from being blown out of the feed channel 202 and stirring up dust.

[0061] like Figure 5 As shown, optionally, a brush 2113 is provided on one side surface of the paddle 2112 close to the inner wall of the discharge pipe.

[0062] In the present application, the brush 2113 on the paddle 2112 can also clean the inner wall of the discharge pipe during the rotation process.

[0063] A powder air separation device, the working process of which is as follows:

[0064] When in use, the fan 1 is started to blow air to the rough selection bin 2. At the same time, the negative electrode material to be air-selected is added to the hopper 21 above the rough selection bin 2. The power device (a motor in this application) connected to the rotary feeder 211 is started to drive the rotating shaft 2111 of the rotary feeder 211 to rotate, thereby driving the blade 2112 to rotate. The blade 2112 transfers the material to be air-selected into the feed channel 202 in batches during the rotation process, and can also prevent the wind from the air selection channel 201 from blowing out of the feed channel 202 and stirring up dust. The brush 2113 on the blade 2112 can also clean the inner wall of the feed pipe during the rotation process.

[0065] The material falls from the feed channel 202 into the air separation channel 201, and the wind blown from the fan 1 contacts the material from bottom to top through the air separation channel 201. The particles with heavier specific gravity in the material (whose gravity is greater than the lifting force provided by the air separation wind) will fall and then be discharged from the heavy material discharge channel 203 and fall into the coarse material collection bin 22 for temporary storage. After rough selection in the coarse selection bin 2, the material is followed by the air separation wind through the upper end of the air separation channel 201 and enters the feed port 301 of the sorting bin 3.

[0066] Since the materials blown into the sorting bin 3 by the wind selection wind move forward with the wind selection wind and thus have a certain initial velocity, the speeds of the materials entering the sorting bin 3 are different due to the different particle sizes. The large particles have a low speed and fall into the collection bin 31 near the feed inlet 301, while the small particles have a relatively high speed and travel a relatively long path in the sorting bin 3, so they fall into the collection bin 31 far away from the feed inlet 301. The filter screen 32 arranged above the collection bin 31 can intercept large particles and prevent some of the larger particles from falling into the collection bin 31. In the present application, a roller 33 is arranged below the sorting bin 3. While the roller 33 plays the role of dispersing the materials, it can also guide the airflow due to its curved surface, so that the large particles can fall into the collection bin 31 near the feed inlet 301 faster. Since the drum 33 rotates under the drive of the power device connected thereto (a motor in this application, connected and driven by a pulley or a sprocket), the material falling on the drum will be caught and scraped off by 34 during the rotation of the drum 33.

[0067] At the same time, a downwardly convex arc-shaped wind plate 35 is provided on the upper part of the feed port 301. This shape will reduce the cross-section at the entrance and increase the air flow rate, so that the material can have a farther falling distance, thereby improving the separation degree of materials of different particle sizes, and because the inclined part of the wind plate 35 plays a role of diversion, the fine particles of the material can have a farther distance under the guidance of the wind plate 35 due to their small particle size and low specific gravity, so that they can be discharged from the material selection air outlet 302 of the sorting bin 3, and the dust-laden airflow (wherein the particles are finer) discharged from the sorting bin 3 enters the cyclone separator 4 for separation, the separated dust is collected, and the exhausted airflow enters the fan 1 through the pipeline from the gas output end of the cyclone separator 4 for circulation, thereby improving the air selection efficiency and reducing the escape of dust, thereby protecting the environment.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, ordinary technicians in the field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A powder air separation device, comprising a fan (1), characterized in that: The output end of the fan (1) is connected to the roughing bin (2), the sorting bin (3) and the cyclone separator (4) in sequence; The output end of the cyclone separator (4) is also connected to the input end of the fan (1) through a pipeline; A wind selection channel (201) is vertically arranged in the rough selection bin (2), the upper end of the wind selection channel (201) is connected to the input end of the upper part of a side surface of the selection bin (3), and the lower end is connected to the output end of the fan (1); A hopper (21) is also provided on the top of the roughing bin (2), and the hopper (21) is connected to the air selection channel (201) through a feed channel (202). The bottom of the roughing bin (2) is also connected to the rough material collection bin (22) through a heavy material discharge channel (203).

2. The powder air separation device according to claim 1, characterized in that: An inlet (301) communicating with the air selection channel (201) is provided at the upper portion of one side of the sorting bin (3), and a material selection air outlet (302) is provided at the side opposite to the inlet (301); At least one collecting bin (31) is arranged at the bottom of the separation bin (3) along the flow direction of the separation air; The collecting bin (31) is also provided with a filter screen (32); The filter screen (32) is arranged at an angle.

3. The powder air separation device according to claim 2, characterized in that: A roller (33) is provided in the sorting bin (3), and the top of the roller (33) is tangent to the lower edge of the feed inlet (301); The rotation direction of the drum (33) is the same as the flow direction of the separation air. A scraper (34) is provided on the inner wall of the sorting bin (3) below the drum (33). The scraper (34) is in contact with the surface of the drum (33).

4. The powder air separation device according to claim 3, characterized in that: A downwardly convex wind plate (35) is provided in the sorting bin (3); the wind plate (35) is close to the upper edge of the feed inlet (301); The wind plate (35) comprises a curved portion and an inclined portion, the curved portion of the wind plate (35) being located above the drum (33), the inclined portion of the wind plate (35) being smoothly connected to the curved portion, one end of the inclined portion being connected to the curved portion, and the other end extending obliquely upward and connected to the top of the sorting bin (3).

5. The powder air separation device according to any one of claims 1 to 4, characterized in that: The hopper (21) comprises an upper hopper portion and a lower feed pipe, and a rotary feeder (211) is arranged in the feed pipe of the hopper (21) along the horizontal direction; The rotary feeder (211) is rotatably connected to the feeder pipe.

6. The powder air separation device according to claim 5, characterized in that: The rotary feeder (211) comprises a rotating shaft (2111), and the rotating shaft (2111) passes through the side wall of the feeder tube and is connected to the motor; A plurality of paddles (2112) are arranged on the outer periphery of the rotating shaft (2111), and the paddles (2112) are extended along the length direction of the rotating shaft (2111); One side of the paddle (2112) is fixedly connected to the rotating shaft (2111), and the other end is close to the inner wall of the discharge pipe.

7. The powder air separation device according to claim 6, characterized in that: A brush (2113) is provided on one side surface of the paddle (2112) close to the inner wall of the discharge pipe.

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