Fluidized bed jet mill for lithium battery material preparation

Abstract

The application discloses a fluidized bed airflow pulverizer for lithium battery material preparation, which comprises a pulverizing cavity, a feeding pipe, a sight glass, a flow dividing device, a nozzle device, a grading cavity, a grading device, a bottom cavity and a main machine support, the pulverizing cavity, the grading cavity and the bottom cavity are arranged in sequence from top to bottom, the feeding pipe is obliquely connected to the side of the pulverizing cavity, the flow dividing device comprises a main flow pipeline, an annular pipeline and a plurality of flow dividing pipelines, the bottom of the annular pipeline is provided with a plurality of round holes, the flow dividing pipelines are connected with the round holes and the nozzle device, the nozzle device comprises a Laval nozzle, a nozzle connecting pipe, a pipe sleeve, a plurality of nozzle sleeve rings and a nozzle mounting flange, the joint of the Laval nozzle is provided with external threads, the inner wall of the nozzle connecting pipe is provided with internal threads, the internal threads and the external threads are matched, the plurality of nozzle sleeve rings are arranged between the Laval nozzle and the nozzle connecting pipe, and the pipe sleeve is arranged at the inlet of the nozzle connecting pipe. Compared with the prior art, the application can realize rapid pulverization of lithium battery materials by the fluidized bed airflow pulverizer.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pulverization, in particular to a fluidized bed jet mill for lithium battery material preparation. BACKGROUND

[0002] The jet mill for lithium battery material preparation is used for accelerating and colliding and breaking the lithium battery material by supersonic airflow, and then centrifugal classifying of the pulverized lithium battery material by high-speed rotating classifying wheel to realize superfine lithium battery material preparation.

[0003] The existing jet mill for lithium battery material preparation has two feeding modes, one is gravity feeding by inclined feeding pipe, and the other is horizontal spiral feeding near the nozzle. Both of the two feeding modes cannot make the lithium battery material uniformly distributed around each nozzle for sufficient acceleration, resulting in low pulverization efficiency. The nozzles of the existing jet mill are fixed, which cannot meet the optimal acceleration distance required by particles of different particle sizes, so that the particle size of the feeding is limited. The existing classifying wheel can only play a classifying role, and cannot further disperse and accelerate the lithium battery material entering the classifying wheel, so the classifying efficiency is not high. The bottom cavity of the existing jet mill also has the problem of material accumulation and residue, which increases the difficulty of material collection and affects the pulverization efficiency.

[0004] Therefore, the present application provides a fluidized bed jet mill for lithium battery material preparation. SUMMARY

[0005] The present application aims to provide a fluidized bed jet mill for lithium battery material preparation, which can realize rapid pulverization of the lithium battery material by the fluidized bed jet mill.

[0006] The above technical purpose of the present application is achieved by the following technical scheme:

[0007] The utility model provides a kind of lithium battery material preparation with fluidized bed airflow pulverizing classifier, including pulverizing cavity, feed pipe, sight glass, shunt device, nozzle device, classification cavity, grading device, bottom cavity and main machine support, the pulverizing cavity, classification cavity and bottom cavity are sequentially arranged from top to bottom, the main machine support supports the bottom cavity, the feed pipe is obliquely connected with the side of the pulverizing cavity, deviates from the axial and radial of the pulverizing cavity, and is communicated with the pulverizing cavity, the shunt device includes main flow pipeline, annular pipeline and multiple shunt pipelines, the annular pipeline surrounds the pulverizing cavity, the bottom of the annular pipeline is equipped with multiple round holes, the shunt pipeline is connected with the round hole and the nozzle device, the nozzle device is installed on the side wall of the pulverizing cavity, and the nozzle device includes Laval nozzle, nozzle connector, pipe sleeve, multiple nozzle sleeve rings and nozzle mounting flange, the joint of the Laval nozzle is equipped with external thread, the inner wall of the nozzle connector is equipped with internal thread, the internal thread and the external thread are matched, the multiple nozzle sleeve rings are arranged between the Laval nozzle and the nozzle connector, the pipe sleeve is arranged at the inlet of nozzle connector, the end of the pipe sleeve is equipped with flange, the nozzle mounting flange is installed outside the pulverizing cavity, and the sight glass is installed on the pulverizing cavity.

[0008] In a preferred embodiment, the Laval nozzle has four, the throat diameter of the Laval nozzle ranges from 4 to 10 mm, 10 to 110 nozzle sleeve rings are sleeved between the Laval nozzle and the nozzle connector, the thickness of the nozzle sleeve ring is 5 mm, the nozzle dimensionless spacing is freely adjusted by 5 to 50 times by disassembling and assembling the nozzle sleeve ring, the nozzle connector is sleeved in the pipe sleeve, the pipe sleeve is connected with the nozzle device mounting flange, and the nozzle device mounting flange is installed outside the pulverizing cavity.

[0009] In a preferred embodiment, the annular pipeline has at least two, and the mounting flange for connection is arranged between the annular pipelines.

[0010] In a preferred embodiment, the shunt pipeline includes first section, second section and third section, the first section and the third section are arranged as straight pipes, the second section is arranged as elbow pipe, the two ends of the second section are connected with the first section and the third section respectively, the first section is connected with the round hole, and the third section is connected with the nozzle device.

[0011] In a preferred embodiment, the third section and the nozzle device are connected by clamp, and the inclination angle of the feed pipe ranges from 10° to 60°.

[0012] In a preferred embodiment, the pulverizing cavity and the bottom cavity are connected by welding, the main machine support comprises a plurality of angle strut plates and an angle steel bottom frame, the angle strut plates are supported on the pulverizing cavity and / or the bottom cavity and arranged on the angle steel bottom frame, and flanges matched with each other are arranged between the classification cavity and the pulverizing cavity.

[0013] In a preferred embodiment, the bottom cavity is arranged in a conical shape with a conical angle of 30°-160°, and a plurality of rebounding members are arranged on the inner side wall and the bottom of the bottom cavity, the number of the rebounding members is arranged in a range of 5-20, and the rebounding member comprises a sticking base and an air bag, the bottom of the air bag is provided with an air inlet groove which extends upwardly and upwardly, the top of the air inlet groove is provided with an air inlet which is connected to the inside of the air bag, a filter sheet is arranged on the air inlet, the base comprises a sticking plate and a guide seat, the guide seat is arranged on the sticking plate, the guide seat is arranged in a plate shape which is perpendicular to the sticking plate, the guide seat comprises a flow dividing part and a flow guiding part which are connected to each other, the top of the flow dividing part is arranged as a blade part, and the upper surface of the flow guiding part is arranged as a flow guiding surface which extends from the bottom to the air inlet.

[0014] In a preferred embodiment, the classification device comprises a motor, a motor mounting flange, a classification wheel, a backflushing air sleeve, a backflushing air sleeve mounting flange and a fan, the motor mounting flange is arranged on the side wall of the classification cavity, the motor is connected to the motor mounting flange, the fan, a fan wheel front end cover and the fan are fixedly connected, the backflushing air sleeve mounting flange is arranged on the side wall of the classification cavity, and the backflushing air sleeve is welded on the backflushing air sleeve mounting flange.

[0015] In a preferred embodiment, the classification wheel comprises a classification wheel front end cover, classification wheel blades and a classification wheel rear end cover, a plurality of slot holes are arranged on the edges of the classification wheel front end cover and the classification wheel rear end cover, the classification wheel blades are inlaid in the slot holes, and a hole for discharging materials is arranged at the center of the classification wheel rear end cover.

[0016] In a preferred embodiment, the fan comprises a plurality of fan blades, a fan cover, a plurality of fan supports and a fan hub, the fan blades are inlaid on the outer edge of the fan hub, the plurality of fan supports are arranged on the fan hub, and the outer ends of the fan supports are connected to the fan cover.

[0017] Compared with the prior art, the fluidized bed airflow crushing classifier for high lithium battery material preparation disclosed by the application utilizes the feeding pipe after the improved installation position to realize the spiral uniform distribution of feeding, ensures that most of the lithium battery materials can be sent near the nozzle, avoids the high-speed airflow at the center position, and quickly realizes the full-speed crushing of the lithium battery materials; the relative spacing of the nozzle device can be adjusted in multiple stages, can meet the acceleration distance requirements of different types and different particle sizes of lithium battery materials, and has stronger adaptability. The fan in the classification device improves the dispersibility of the crushed lithium battery materials; the use of the rebounding piece also improves the crushing effect and prevents the accumulation of materials in the bottom cavity. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a structural schematic view of a fluidized bed airflow crushing classifier for lithium battery material preparation disclosed by the application;

[0019] Figure 2 is a full cross-sectional view of a fluidized bed airflow crushing classifier for lithium battery material preparation disclosed by the application;

[0020] Figure 3 is a full cross-sectional view of a crushing structure of a fluidized bed airflow crushing classifier for lithium battery material preparation disclosed by the application;

[0021] Figure 4 is a full cross-sectional view of a classification structure of a fluidized bed airflow crushing classifier for lithium battery material preparation disclosed by the application;

[0022] Figure 5 is a schematic view of a nozzle device of a fluidized bed airflow crushing classifier for lithium battery material preparation disclosed by the application;

[0023] Figure 6 is a schematic view of a nozzle connecting pipe structure of a fluidized bed airflow crushing classifier for lithium battery material preparation disclosed by the application;

[0024] Figure 7 is a schematic view of a Laval nozzle structure of a fluidized bed airflow crushing classifier for lithium battery material preparation disclosed by the application;

[0025] Figure 8 is a schematic view of a fan structure of a fluidized bed airflow crushing classifier for lithium battery material preparation disclosed by the application.

[0026] Figure 9 is a schematic view of a rebounding piece structure of a fluidized bed airflow crushing classifier for lithium battery material preparation disclosed by the application.

[0027] Figure 10 is a schematic view of a longitudinal cross-sectional structure of a rebounding piece of a fluidized bed airflow crushing classifier for lithium battery material preparation disclosed by the application.

[0028] IN THE DRAWINGS

[0029] 10, pulverizing chamber; 20, feeding pipe; 30, sight glass; 40, flow dividing device; 401, main flow pipe; 402, annular pipe; 403, annular pipe mounting flange; 404, flow dividing pipe; 405, clamp; 50, nozzle device; 501, Laval nozzle; 502, nozzle connecting pipe; 503, pipe sleeve; 504, nozzle sleeve ring; 505, nozzle mounting flange; 60, grading chamber; 70, grading device; 701, motor; 702, motor mounting flange; 703, grading wheel front end cover; 704, grading wheel blade; 705, grading wheel rear end cover; 706, backflushing air sleeve; 707, backflushing air sleeve mounting flange; 708, fan; 7081, fan blade; 7082, fan cover; 7083, fan support; 7084, fan wheel hub; 80, bottom chamber; 801, rebounding piece; 8011, air bag; 8012, air inlet groove; 8013, air inlet; 8014, filter sheet; 8015, pasting bottom plate; 8016, guiding seat; 8017, flow dividing part; 8018, blade part; 8019, flow guiding part; 80110, flow guiding surface; 90, main machine support; 901, angle support plate; 902, angle steel bottom frame. DETAILED DESCRIPTION

[0030] The application will be further described in detail below with reference to the drawings.

[0031] The specific embodiments are only an explanation of the application, and are not a limitation of the application. Those skilled in the art can make modifications to the embodiments without creative contribution after reading the specification, and the modifications are protected by the patent law as long as they are within the scope of the claims of the application.

[0032] The utility model provides a kind of lithium battery material preparation with fluidized bed airflow pulverization classifier, including pulverization cavity, feed pipe, sight glass, shunt device, nozzle device, classification cavity, grading device, bottom cavity and main machine support, the pulverization cavity, classification cavity and bottom cavity are sequentially arranged from top to bottom, the main machine support supports the bottom cavity, the feed pipe is obliquely connected with the side of the pulverization cavity, deviates from the axial and radial of the pulverization cavity, and is communicated with the pulverization cavity, the shunt device includes main flow pipeline, annular pipeline and multiple shunt pipelines, the annular pipeline surrounds the pulverization cavity, the bottom of the annular pipeline is equipped with multiple round holes, the shunt pipeline is connected with the round hole and the nozzle device, the nozzle device is installed on the side wall of the pulverization cavity, the nozzle device includes Laval nozzle, nozzle connector, pipe sleeve, multiple nozzle sleeve rings and nozzle mounting flange, the joint of the Laval nozzle is equipped with external thread, the inner wall of the nozzle connector is equipped with internal thread, the internal thread and the external thread are matched, the multiple nozzle sleeve rings are arranged between the Laval nozzle and the nozzle connector, the pipe sleeve is arranged at the inlet of nozzle connector, the end of the pipe sleeve is equipped with flange, the nozzle mounting flange is installed outside the pulverization cavity, the sight glass is installed on the pulverization cavity, for observing the pulverization state of lithium battery material in the pulverization cavity.

[0033] The fluidized bed airflow pulverization classifier for preparing high-lithium battery material of the embodiment realizes spiral uniform distribution of feeding by the improved installation position of the feed pipe, ensures that most of the lithium battery material can be sent near the nozzle, avoids the high-speed airflow at the central position, and quickly realizes the full-speed breaking of the lithium battery material; The relative spacing of the nozzle device can be adjusted in multiple stages, which can meet the acceleration distance requirements of different types and different particle sizes of lithium battery material, and has stronger adaptability.

[0034] Further, the Laval nozzle has four, the throat diameter of the Laval nozzle ranges from 4 to 10 mm, 10-110 nozzle sleeve rings are sleeved between the Laval nozzle and the nozzle connector, the thickness of the nozzle sleeve ring is 5 mm, the nozzle dimensionless spacing is freely adjusted to 5-50 times by disassembling and assembling the nozzle sleeve ring, the nozzle connector is sleeved in the pipe sleeve, the pipe sleeve is connected with the nozzle device mounting flange, and the nozzle device mounting flange is installed outside the pulverization cavity.

[0035] Further, the annular pipeline has at least two, and the mounting flange for connection is arranged between the annular pipelines.

[0036] Further, the shunt pipeline includes a first section, a second section and a third section, the first section and the third section are arranged as straight pipes, the second section is arranged as an elbow pipe, the two ends of the second section are connected with the first section and the third section respectively, specifically connected by a clamp, the first section is connected with the round hole, and the third section is connected with the nozzle device.

[0037] Further, the third section and the nozzle device are connected by a clamp, and the inclination angle of the feeding pipe ranges from 10° to 60°.

[0038] Further, the pulverizing cavity and the bottom cavity are connected by welding, the main machine support comprises a plurality of angle strut plates and an angle steel bottom frame, the angle strut plates are supported on the pulverizing cavity and / or the bottom cavity and arranged on the angle steel bottom frame, and flanges are arranged between the grading cavity and the pulverizing cavity.

[0039] Further, the bottom cavity is tapered, the taper angle ranges from 30° to 160°, the inner side wall and the bottom of the bottom cavity are provided with a plurality of rebounding members, the number of the rebounding members ranges from 5 to 20, the rebounding members comprise a sticking base and an air bag, the bottom of the air bag is provided with an air inlet groove which extends upwardly, the top of the air inlet groove is provided with an air inlet which is connected to the inside of the air bag, the air inlet is provided with a filter, the base comprises a sticking bottom plate and a guide seat, the guide seat is arranged on the sticking bottom plate, the guide seat is plate-shaped and perpendicular to the sticking bottom plate, the guide seat comprises a flow dividing part and a flow guiding part which are connected to each other, the top of the flow dividing part is provided with a blade part, and the upper surface of the flow guiding part is provided with a flow guiding surface which extends from the bottom to the air inlet.

[0040] Further, the grading device comprises a motor, a motor mounting flange, a grading wheel, a backflushing air sleeve, a backflushing air sleeve mounting flange and a fan, the motor mounting flange is arranged on the side wall of the grading cavity, the motor is connected to the motor mounting flange, the fan, a fan wheel front end cover and the fan are fixedly connected, the backflushing air sleeve mounting flange is arranged on the side wall of the grading cavity, and the backflushing air sleeve is welded on the backflushing air sleeve mounting flange.

[0041] Further, the grading wheel comprises a grading wheel front end cover, grading wheel blades and a grading wheel rear end cover, the edges of the grading wheel front end cover and the grading wheel rear end cover are provided with a plurality of grooves, the grading wheel blades are inlaid in the grooves, and the center of the grading wheel rear end cover is provided with a hole for discharging materials.

[0042] Further, the fan comprises a plurality of fan blades, a fan cover, a plurality of fan supports and a fan hub, the fan blades are inlaid in the outer edge of the fan hub, the plurality of fan supports are arranged on the fan hub, and the outer ends of the fan supports are connected to the fan cover.

[0043] In the embodiment, the rebounding members are made of super-elastic materials such as butadiene rubber and natural rubber, all parts which are in direct contact with lithium battery materials except the rebounding members are additionally provided with ceramic lining, there is no magnetic pollution, and excessive wear is prevented.

[0044] In order to make the present case more clearly, the following is described in conjunction with the drawings:

[0045] The application discloses a fluidized bed airflow pulverizing classifier for high lithium electric material preparation, which comprises a pulverizing cavity 10, a feeding pipe 20, a sight glass 30, a shunt device 40, a main flow pipe 401, an annular pipe 402, an annular pipe mounting flange 403, a shunt pipe 404, a clamp 405, a nozzle device 50, a Laval nozzle 501, a nozzle connecting pipe 502, a pipe sleeve 503, a nozzle sleeve ring 504, a nozzle mounting flange 505, a classification cavity 60, a classification device 70, a motor 701, a motor mounting flange 702, a classification wheel front end cover 703, a classification wheel blade 704, a classification wheel rear end cover 705, a backflush gas sleeve 706, a backflush gas sleeve mounting flange 707, a fan 708, fan blades 7081, a fan cover 7082, a fan support 7083, a fan wheel hub 7084, a bottom cavity 80, a main machine support 90 and angle support rib plates 901 and angle steel bottom frames 902.

[0046] In the embodiment, the pulverizing cavity 10 and the bottom cavity 80 are connected into one body by welding, and the four angle support rib plates 901 are welded on the outer sides of the pulverizing cavity 10 and the bottom cavity 80, and the ends of the angle support rib plates 901 and the top surface of the angle steel bottom frame 902 are connected by bolts.

[0047] As Figure 2 , Figure 3 Figure 9 and Figure 10As shown, the bottom cavity 80 is provided in a conical shape with a conical angle of 30°-160°, and the inner side wall and bottom of the bottom cavity 80 are provided with a plurality of rebounding members 801, each of which comprises a sticking base and an air bag 8011, the bottom of the air bag 8011 is provided with an air inlet groove 8012 extending upwardly and obliquely, the top of the air inlet groove 8012 is provided with an air inlet 8013 communicating with the inside of the air bag 8011, and a filter piece 8014 is arranged on the air inlet 8013, the base comprises a sticking base plate 8015 and a guide seat 8016, the guide seat 8016 is arranged on the sticking base plate 8015 and is provided in a plate shape perpendicular to the sticking base plate 8015, the guide seat 8016 comprises a flow dividing part 8017 and a flow guiding part 8019 connected to each other, the top of the flow dividing part 8017 is provided with a blade part 8018, and the upper surface of the flow guiding part 8019 is provided with a flow guiding surface 80110 extending from the bottom to the air inlet 8013. Under the above structure, when the material flow collides with the air bag 8011 while passing through the rebounding member 801, the material is bounced away due to the elasticity of the air bag 8011, so that a plurality of elastic members are arranged on the inner side wall of the bottom cavity, which is equivalent to making the surface of the bottom cavity elastic, and the material is bounced back when it contacts with the surface, thereby further improving the crushing effect and preventing the accumulation of materials at the bottom.

[0048] Further, when the material flow passes through the rebounding member 801, the flow dividing part 8017 is first contacted, the flow dividing part 8017 divides the material flow to make the material flow have a tendency to flow to both sides, and most of the materials in the material flow are divided to both sides of the air bag 8011 due to the large inertia of the materials, that is, most of the materials are separated, and the material flow after separating most of the materials flows to the flow guiding surface 80110 and is guided by the flow guiding surface 80110 to flow to the air inlet 8013 and then enters the inner cavity of the air bag 8011 after being filtered by the filter piece 8014. Thus, through the structural arrangement of the rebounding member 801, on the one hand, most of the materials can be separated to avoid the materials rushing to the air inlet 8013, and on the other hand, the gas in the air bag 8011 is provided by the system itself, which has a better dynamic effect compared to the way of inflating the air bag 8011 itself, that is, the air bag 8011 is always in an unstable state and the volume is uncertain, so that an unstable rebounding effect can be generated to make the materials bounce away in different directions, thereby achieving a better crushing effect and preventing accumulation.

[0049] The main flow pipe 401 of the flow dividing device 40 is a flanged straight pipe, and the outlet is welded with a ring pipe 402. There are two ring pipes 402, and the ring pipes 402 are connected by a ring pipe mounting flange 403. The bottom of each ring pipe 402 is provided with two small-diameter holes for connecting four small-diameter flow pipes 404. The flow pipe 404 has three sections, the first section is a straight pipe, the remaining two sections are a bend pipe and a straight pipe, and the two pipes are connected by a clamp 405. The last section of the straight pipe is connected to the nozzle device 50 through the clamp 405, realizing the communication between the flow dividing device 40 and the nozzle device 50.

[0050] The Laval nozzle 501 of the nozzle device 50 has four joints, and the joint of the Laval nozzle 501 is a threaded rod with external threads, which is screwed with a nozzle connector 502 with internal threads. A plurality of annular nozzle sleeves 504 are arranged between the Laval nozzle 501 and the nozzle connector 502. By disassembling the nozzle sleeve 504 and adjusting the screwing depth of the corresponding Laval nozzle, the nozzle dimensionless spacing can be freely adjusted by 5-50 times. The inlet of the nozzle connector 502 has a ring that can be directly inserted into the pipe sleeve 503 to prevent axial displacement. The end of the pipe sleeve 503 is a flange, which is connected with the nozzle mounting flange 505, and the nozzle mounting flange 505 is welded on the outside of the crushing chamber 10, realizing the fixation of the nozzle device 50.

[0051] The bottom side of the grading chamber 60 is provided with a flange, which is connected with the flange at the top of the crushing chamber 10.

[0052] The motor 701 of the classifying device 70 is provided with a flange and is connected with a motor mounting flange 702 which is bolted with the left side of the classifying cavity 60 to fix the motor 701. The shaft of the motor 701 is provided with a flat key and two threaded holes are formed at the end of the shaft. A through hole and a key groove are formed at the center of the front end cover 703 of the classifying wheel to connect the shaft of the motor 701, and a plurality of slot holes are formed at the outer edge of the front end cover 703. A through hole for discharging is formed at the center of the rear end cover 705 of the classifying wheel, and a plurality of slot holes are also formed at the outer edge of the rear end cover 705. The slot holes of the front end cover 703 and the rear end cover 705 are used to inlay the flat classifying wheel blades 704 which are rectangular. The fan 708 is provided with three fan blades 7081 with large inclination angle which are inlaid at the outer edge of the fan hub 7084. Three fan supports 7083 are mounted on the fan hub 7084, the fan supports 7083 are alternately mounted with the fan blades 7081, and the outer end of the fan supports 7083 is connected with the fan cover 7082. The fan cover 7082 is in the shape of a circular ring to prevent the radial wind generated by the fan blades 7081 from affecting the lithium battery material entering the classifying device 70. Two through holes are formed on the fan hub 7084, and the fan 708, the front end cover 703 of the classifying wheel and the shaft of the motor 701 are fixedly connected in sequence by bolts.

[0053] The backflush gas sleeve 706 is welded on the backflush gas sleeve mounting flange 707, the backflush gas sleeve 706 is coaxially mounted with the rear end cover 705 of the classifying wheel and a certain radial installation gap is formed between them. The backflush gas sleeve mounting flange 707 is bolted with the right side of the classifying cavity 60 to fix the backflush gas sleeve 706.

[0054] As shown in Figure 1 , the high-pressure gas flow enters the annular pipe 402 through the main flow pipe 401 of the flow splitting device 40 and is split into two high-pressure gas flows. As shown in Figure 5 , the high-pressure gas flow then enters the four smaller-diameter flow splitting pipes 404 and is further accelerated to the nozzle device 50.

[0055] Specifically, as shown in Figure 7 , the Laval nozzle 501 of the nozzle device 50 is in the form of a nozzle which first contracts and then expands, and the high-pressure gas flow is compressed through the contraction of the Laval nozzle 501 and then expands through the outlet to generate a supersonic gas flow with a Mach number greater than 1. At the same time, the lithium battery material in the feeding pipe 20 is carried into the crushing cavity 10 by the gas flow and is subjected to collision crushing under the action of the supersonic gas flow.

[0056] Specifically, as shown in Figure 2As shown, the lithium battery material is carried into the feeding pipe 20 by the airflow. Due to the inclination of the axial direction and the radial direction of the feeding pipe 20 and the crushing cavity 10, and the action of the airflow, the lithium battery material moves from the outlet of the feeding pipe 20, forms a gas-solid spiral falling state from top to bottom near the inner wall of the crushing cavity 10, and falls near the outlet of each nozzle device 50, so as to ensure that the lithium battery material can be fully accelerated and collided by each nozzle device 50, and the crushing efficiency is improved.

[0057] Specifically, as shown in the figure, Figure 5 When the particle size of the lithium battery material entering the feeding pipe 20 is large or small, the required acceleration distance is different. By disassembling or assembling the nozzle sleeve ring 504, and changing the screwing depth of the Laval nozzle 501 to change the axial spacing between the Laval nozzles 501, the large particle size lithium battery material is crushed by a large nozzle spacing, and the small particle size lithium battery material is crushed by a small nozzle spacing, so as to realize multi-stage adjustment of the dimensionless spacing of the nozzle, and widen the particle size range of the feed.

[0058] Specifically, as shown in the figure, Figure 4 After the lithium battery material is collided and crushed, it enters the classification cavity 60 along the upward airflow in the crushing cavity 10, and is classified by the classification device 70 in the classification cavity 60.

[0059] Specifically, as shown in the figure, Figure 4 The classification wheel blades 704, the fan 708 and the like are driven by the high-speed rotation of the motor 701 to rotate synchronously at high speed. Since the classification wheel blades 704 have a certain gap and rotate at a high speed, the particle sizes of the crushed lithium battery materials are different, so only the lithium battery materials with a particle size smaller than a certain particle size can overcome the centrifugal force and enter the classification device 70 along the airflow. At the same time, the fan 708 performs a certain suction on the airflow in the classification cavity 60 during synchronous high-speed rotation, so that the lithium battery materials with small particle sizes near the classification device 70 can enter the classification device 70 faster. The lithium battery materials with large particle sizes collide with the classification wheel blades 704 and then leave the classification cavity 60 to continue crushing in the crushing cavity 10, until the particle size meets the classification of the classification device 70, and then the lithium battery materials can be separated out.

[0060] Specifically, as shown in the figure, Figure 4 When the lithium battery material enters the classification device 70, the fan 708 in the classification device 70 generates a certain wind force to blow the lithium battery material into the through hole of the backflush air sleeve 706, so that the lithium battery material enters the subsequent processing device. At the same time, the backflush air sleeve 706 sprays a certain pressure airflow at the installation gap with the rear end cover 705 of the classification wheel, so as to prevent the lithium battery materials with large particle sizes from entering the classification device 70. The device strengthens the dispersion of the lithium battery material, avoids the accumulation of the lithium battery material in the classification device 70, and improves the classification efficiency.

[0061] It is to be noted that, as used in this specification and the appended claims, the singular forms "a," "an" and "the" include plural referents unless the context clearly dictates otherwise. Thus, for example, reference to "a component" can include a combination of two or more components. Additionally, the words "comprise," "comprises," and "comprising" or the like are used herein to generally mean including, containing or encompassing, but not limiting to the contents thereof such that any process, method, article, or apparatus that includes a list of elements is not necessarily limited to those elements, but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. Further, the word "comprise" or "comprises" or the like used in this specification and the appended claims does not exclude the presence of other elements or steps than those listed in the process, method, article, or apparatus. In addition, the word "or" is used in the context of this specification and the appended claims to mean "and / or" unless the context clearly dictates otherwise.

[0062] The above description of the embodiments is for the purpose of understanding and is not intended to limit the application. Those skilled in the art will readily understand and appreciate that various modifications can be made to the embodiments without departing from the scope of the application. Accordingly, the application is not limited to the embodiments described above, but is intended to cover all modifications and equivalents falling within the scope of the application.

Claims

1. A fluidized bed jet mill for preparing a lithium battery material, characterized by, The pulverizing cavity, the grading cavity and the bottom cavity are arranged in sequence from top to bottom, the main machine support supports the bottom cavity, the feeding pipe is obliquely connected to the side of the pulverizing cavity, deviates from the axial and radial directions of the pulverizing cavity and communicates with the pulverizing cavity, the flow dividing device comprises a main flow pipeline, an annular pipeline and a plurality of flow dividing pipelines, the annular pipeline surrounds the pulverizing cavity, the bottom of the annular pipeline is provided with a plurality of round holes, the flow dividing pipelines are connected with the round holes and the nozzle device, the nozzle device is installed on the side wall of the pulverizing cavity, the nozzle device comprises a Laval nozzle, a nozzle connecting pipe, a pipe sleeve, a plurality of nozzle sleeve rings and a nozzle mounting flange, the joint of the Laval nozzle is provided with external threads, the inner wall of the nozzle connecting pipe is provided with internal threads, the internal threads and the external threads are matched, the plurality of nozzle sleeve rings are arranged between the Laval nozzle and the nozzle connecting pipe, the pipe sleeve is arranged at the inlet of the nozzle connecting pipe, the end of the pipe sleeve is provided with a flange, the nozzle mounting flange is installed on the outside of the pulverizing cavity, and the sight glass is installed on the pulverizing cavity.

2. The fluidized bed jet mill for preparing a lithium material according to claim 1, wherein The bottom cavity is provided in a conical shape, the conical angle is 30°-160°, the inner side wall and the bottom of the bottom cavity are provided with a plurality of rebounding pieces, the number of the rebounding pieces is 5-20, the rebounding piece comprises a sticking base and an air bag, the bottom of the air bag is provided with an air inlet groove, the air inlet groove extends upwardly and obliquely, the top of the air inlet groove is provided with an air inlet communicating with the inside of the air bag, the air inlet is provided with a filter piece, the base comprises a sticking bottom plate and a guide seat, the guide seat is arranged on the sticking bottom plate, the guide seat is provided in a plate shape perpendicular to the sticking bottom plate, the guide seat comprises a flow dividing part and a flow guiding part connected with each other, the top of the flow dividing part is provided with a blade part, and the upper surface of the flow guiding part is provided with a flow guiding surface extending from bottom to top to the air inlet.

3. The fluidized bed jet mill for preparing a lithium material according to claim 1, wherein The Laval nozzle has four, the throat diameter of the Laval nozzle is 4-10mm, 10-110 nozzle sleeve rings are sleeved between the Laval nozzle and the nozzle connecting pipe, the thickness of the nozzle sleeve ring is 5mm, the nozzle dimensionless spacing is freely adjusted by 5-50 times through the disassembly and assembly of the nozzle sleeve ring, the nozzle connecting pipe is sleeved in the pipe sleeve, the pipe sleeve is connected with the nozzle device mounting flange, and the nozzle device mounting flange is installed on the outside of the pulverizing cavity.

4. The fluidized bed jet mill for preparing a lithium material according to claim 1, wherein The annular pipeline has at least two, and the mounting flanges for connection are arranged between the annular pipelines.

5. The fluidized bed jet mill for preparing a lithium material according to claim 4, wherein The flow dividing pipeline comprises a first section, a second section and a third section, the first section and the third section are provided in straight pipes, the second section is provided in an elbow pipe, the two ends of the second section are connected with the first section and the third section respectively, the first section is connected with the round hole, and the third section is connected with the nozzle device. The third section and the nozzle device are connected by a clamp, and the inclination angle of the feeding pipe ranges from 10° to 60°.

6. The fluidized bed jet mill for preparing a lithium material according to claim 1, wherein The pulverizing cavity and the bottom cavity are connected by welding, the main machine support comprises a plurality of angle support plates and an angle steel bottom frame, the angle support plates are supported on the pulverizing cavity and / or the bottom cavity and arranged on the angle steel bottom frame, and flanges matched with each other are arranged between the grading cavity and the pulverizing cavity.

7. The fluidized bed jet mill for preparing a lithium material according to claim 1, wherein The grading device comprises a motor, a motor mounting flange, a grading wheel, a backflushing air sleeve, a backflushing air sleeve mounting flange and a fan, the motor mounting flange is arranged on the side wall of the grading cavity, the motor is connected to the motor mounting flange, the fan, a fan wheel front end cover and the fan are fixedly connected, the backflushing air sleeve mounting flange is arranged on the side wall of the grading cavity, and the backflushing air sleeve is welded on the backflushing air sleeve mounting flange.

8. The fluidized bed jet mill for preparing a lithium material according to claim 7, wherein The grading wheel comprises a grading wheel front end cover, grading wheel blades and a grading wheel rear end cover, edges of the grading wheel front end cover and the grading wheel rear end cover are each provided with a plurality of slot holes, the grading wheel blades are inlaid in the slot holes, and a hole for discharging materials is arranged at the center of the grading wheel rear end cover.

9. The fluidized bed jet mill for preparing a lithium material according to claim 7, wherein, The fan comprises a plurality of fan blades, a fan cover, a plurality of fan supports and a fan hub, the fan blades are inlaid in the outer edge of the fan hub, the plurality of fan supports are arranged on the fan hub, and outer ends of the fan supports are connected to the fan cover.

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