Jet mill for lithium iron phosphate production

Abstract

The utility model provides a jet mill for lithium iron phosphate production, which relates to the technical field of lithium iron phosphate production devices, and comprises a bottom cylinder, an air distribution chamber, an air ejector pipe, a crushing cylinder, a grading cylinder, a grading wheel, a motor and a material receiving pipe, the air distribution chamber is annularly arranged on the outer wall of the bottom cylinder, one end of the air ejector pipe is connected with an air outlet arranged on the air distribution chamber, and the other end of the air ejector pipe is connected with an air outlet arranged on the grading wheel. The bottom of the smashing cylinder is installed on the top of the bottom cylinder, a feeding port is formed in the smashing cylinder, the bottom of the grading cylinder is installed on the top of the smashing cylinder, and the top of the grading cylinder is closed. The power output end of the motor is connected with the power input end of the grading wheel. By means of the lithium iron phosphate grading device, the problems that when a traditional jet mill crushes lithium iron phosphate, coarse particles which do not reach the standard easily reach the inside of the grading barrel along with airflow, consequently, the grading wheel frequently treats particles needing to be continuously crushed, and energy waste and abrasion of the grading wheel are caused can be solved.

Description

Technical Field

[0001] This utility model relates to the technical field of lithium iron phosphate production equipment, specifically to an airflow pulverizer for lithium iron phosphate production. Background Technology

[0002] Lithium iron phosphate (LFP) is a lithium-ion battery electrode material with the chemical formula LiFePO4. It is mainly used in various lithium-ion batteries. The main production processes include mixing, spray drying, sintering, pulverizing, mixing, baking, and packaging. After sintering, the LFP material is usually pulverized using an air jet mill: compressed air is accelerated into a supersonic airflow through a nozzle and injected into the pulverizing zone to fluidize the material. The material is pulverized by collisions in the pulverizing zone. The pulverized material is then transported to the grading zone by the rising airflow. The fine powder that meets the particle size requirements is screened out by horizontally arranged grading wheels. The coarse powder that does not meet the particle size requirements is returned to the pulverizing zone for further pulverization. The qualified fine powder is collected by the airflow into a high-efficiency cyclone separator.

[0003] Traditional air jet mills use a cylindrical grinding cylinder, which presents the following problems during the grinding of sintered lithium iron phosphate: incompletely ground coarse particles easily reach the classifying cylinder with the airflow, causing the classifying wheel to frequently process particles that should continue grinding, resulting in energy waste, wear, and even blockage of the classifying wheel, increasing maintenance frequency and production costs. Therefore, this application proposes an air jet mill for lithium iron phosphate production. Utility Model Content

[0004] To overcome the problems in the background technology, this utility model provides an air jet mill for lithium iron phosphate production, which solves the problem that coarse particles that do not meet the standard are easily carried into the classifying cylinder by the air jet when the traditional air jet mill is used to pulverize lithium iron phosphate. This causes the classifying wheel to frequently process particles that should continue to be pulverized, resulting in energy waste and wear of the classifying wheel, and even blockage, which increases the maintenance frequency and production cost.

[0005] To achieve the above objectives, this utility model is implemented through the following technical solution:

[0006] An airflow pulverizer for lithium iron phosphate production includes a bottom cylinder, an air distribution chamber, an air jet pipe, a pulverizing cylinder, a classifying cylinder, a classifying wheel, a motor, and a receiving pipe. The bottom cylinder has a discharge port at its bottom. The air distribution chamber is annularly arranged on the outer wall of the bottom cylinder, and an air inlet pipe is installed on the air distribution chamber. The air jet pipe is evenly installed between the air distribution chamber and the air jet pipe, with one end connected to an air outlet on the air distribution chamber and the other end connected to an air inlet on the bottom cylinder. The bottom of the pulverizing cylinder is installed at the top of the bottom cylinder, and a feed inlet is provided on the pulverizing cylinder. The bottom of the classifying cylinder is installed at the top of the pulverizing cylinder, with the top closed. The classifying wheel is horizontally installed inside the classifying cylinder. The motor is installed on the outer wall of the classifying cylinder, and the power output end of the motor is connected to the power input end of the classifying wheel. The receiving pipe is installed on the shell of the classifying cylinder and connected to the discharge end of the classifying wheel.

[0007] Furthermore, the crushing cylinder is a cylindrical body with a wedge-shaped cross-section, and the bottom opening and top opening of the gradually narrowing crushing cylinder are connected to the bottom cylinder and the crushing cylinder respectively through flanges.

[0008] Furthermore, a receiving chamber is provided inside the grading cylinder. The receiving chamber is cylindrical and installed on the top of the grading cylinder. The outer wall of the receiving chamber is evenly provided with receiving ports that connect to the discharge ends of multiple grading wheels. The receiving pipe is installed on the top of the grading cylinder and communicates with the receiving chamber.

[0009] Furthermore, the grading cylinder extends coaxially into the receiving port of the receiving chamber, and a gap is provided between the outer wall of the grading cylinder and the inner wall of the receiving port, thus suspending it within the receiving port.

[0010] The beneficial effects of this utility model are:

[0011] The crushing cylinder of this application is a cylindrical body with a wedge-shaped cross-section. Compared with the traditional straight cylinder, coarse particles are difficult to break through the area due to kinetic energy and centrifugal force, while fine particles can pass through smoothly. After the coarse particles fall into the wedge-shaped cylinder, they continue to be crushed. At the same time, the classifying cylinder is suspended in the receiving port, which avoids the material blockage and wear caused by the traditional bearing installation. It solves the problem that when the traditional air jet mill crushes lithium iron phosphate, coarse particles that do not meet the standard are easily carried by the airflow into the classifying cylinder, causing the classifying wheel to frequently process particles that should continue to be crushed, resulting in energy waste and wear of the classifying wheel. Attached Figure Description

[0012] To clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments are explained.

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0014] Figure 2 This is a side view of the structure of this utility model;

[0015] Figure 3 This is a schematic diagram of the cross-sectional structure of the graded cylinder of this utility model;

[0016] Figure 4 This is a schematic diagram of the internal structure of the grading cylinder of this utility model.

[0017] 1-Bottom cylinder, 11-Discharge port, 2-Air distribution chamber, 21-Air inlet pipe, 3-Air jet pipe, 4-Crushing cylinder, 41-Feed inlet, 5-Grading cylinder, 51-Collection chamber, 52-Collection port, 6-Grading wheel, 7-Motor, 8-Collection pipe. Detailed Implementation

[0018] To make the objectives, technical solutions, and beneficial effects of this utility model clearer, the preferred embodiments of this utility model will be described in detail below with reference to the accompanying drawings, so as to facilitate the understanding of those skilled in the art.

[0019] This utility model discloses an airflow pulverizer for lithium iron phosphate production. (See reference...) Figure 1-4 A liquid air jet mill for lithium iron phosphate production includes a bottom cylinder 1, an air distribution chamber 2, an air jet pipe 3, a grinding cylinder 4, a classifying cylinder 5, a classifying wheel 6, a motor 7, and a receiving pipe 8. The bottom cylinder 1 has a discharge port 11 at its bottom, which can be opened to discharge residual material after grinding. The air distribution chamber 2 is annularly arranged on the outer wall of the bottom cylinder 1, and has an air inlet pipe 21 for connecting to an air compressor to supply compressed air. The air jet pipe 3 is evenly installed between the air distribution chamber 2 and the air jet pipe 3. One end of the air jet pipe 3 is connected to an air outlet on the air distribution chamber 2, and the other end is connected to an air inlet on the bottom cylinder 1. Compressed air is accelerated into a supersonic airflow through a nozzle and then injected into the grinding cylinder 4, causing the material to fluidize. The grinding cylinders 4 collide and crush each other. The crushed material is then conveyed to the classifying cylinder 5 by the rising airflow. The bottom of the grinding cylinder 4 is installed at the top of the bottom cylinder 1. The grinding cylinder 4 is equipped with a feed inlet 41. The bottom of the classifying cylinder 5 is installed at the top of the grinding cylinder 4 and the top is closed. The classifying wheel 6 is installed horizontally inside the classifying cylinder 5. The motor 7 is installed on the outer wall of the classifying cylinder 5. The power output end of the motor 7 is connected to the power input end of the classifying wheel 6. The receiving pipe 8 is installed on the shell of the classifying cylinder 5 and connected to the discharge end of the classifying wheel 6. The crushed material is screened by the horizontally arranged classifying wheel 6 to obtain fine powder that meets the particle size requirements. The coarse powder that does not meet the particle size requirements is returned to the grinding zone for further crushing. The qualified fine powder is collected by the airflow into the high-efficiency cyclone separator.

[0020] See Figure 1-4 The crushing cylinder 4 is a cylindrical body with a wedge-shaped cross-section. The bottom opening and top opening of the crushing cylinder 4, which gradually narrow, are connected to the bottom cylinder 1 and the crushing cylinder 4 respectively through flanges. Compared with the traditional straight cylinder, coarse particles are difficult to break through this area due to kinetic energy and centrifugal force, while fine particles can pass through smoothly. After the coarse particles fall into the wedge-shaped cylinder, they continue to be crushed.

[0021] See Figure 1-4 The grading cylinder 5 is provided with a receiving chamber 51. The receiving chamber 51 is cylindrical and installed on the top of the grading cylinder 5. The outer wall of the receiving chamber 51 is evenly provided with receiving ports 52, which connect to the discharge ends of multiple grading wheels 6. The receiving pipe 8 is installed on the top of the grading cylinder 5 and communicates with the receiving chamber 51. The grading cylinder 5 extends coaxially into the receiving port 52 of the receiving chamber 51, and there is a gap between the outer wall of the grading cylinder 5 and the inner wall of the receiving port 52. It is suspended in the receiving port 52, which avoids the problem of material blockage and wear caused by traditional bearing installation, thus avoiding the energy waste and wear of the grading wheels.

[0022] Work process:

[0023] Connect the air inlet pipe 21 of the air distribution chamber 2 to the air compressor, start the motor 7 to drive the classifying wheel 6 to work, and feed the material into the crushing cylinder 4 through the feed port 41. The compressed air is accelerated into a supersonic airflow through the nozzle and then injected into the crushing cylinder 4 to make the material fluidized. The crushed material is crushed by mutual collision in the crushing cylinder 4. The crushed material is transported to the classifying cylinder 5 by the rising airflow. The fine powder that meets the particle size requirements is screened out by the horizontally arranged classifying wheel 6 and enters the receiving chamber 51. It is then drawn away by the receiving pipe 8 and collected by the high-efficiency cyclone separator.

[0024] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. An air jet mill for lithium iron phosphate production, characterized in that: The system includes a bottom cylinder (1), an air distribution chamber (2), an air jet pipe (3), a crushing cylinder (4), a grading cylinder (5), a grading wheel (6), a motor (7), and a receiving pipe (8). The bottom cylinder (1) is provided with a discharge port (11). The air distribution chamber (2) is arranged in a ring on the outer wall of the bottom cylinder (1). An air inlet pipe (21) is provided on the air distribution chamber (2). The air jet pipe (3) is evenly installed between the air distribution chamber (2) and the air jet pipe (3). One end of the air jet pipe (3) is connected to the air outlet provided on the air distribution chamber (2), and the other end is connected to the bottom cylinder (4). The air inlet on the cylinder (1) is connected, the bottom of the crushing cylinder (4) is installed on the top of the bottom cylinder (1), the crushing cylinder (4) is provided with a feed inlet (41), the bottom of the grading cylinder (5) is installed on the top of the crushing cylinder (4) and the top is closed, the grading wheel (6) is installed horizontally inside the grading cylinder (5), the motor (7) is installed on the outer wall of the grading cylinder (5), the power output end of the motor (7) is connected to the power input end of the grading wheel (6), and the receiving pipe (8) is installed on the shell of the grading cylinder (5) and connected to the discharge end of the grading wheel (6).

2. The air jet mill for lithium iron phosphate production according to claim 1, characterized in that: The crushing cylinder (4) is a cylindrical body with a wedge-shaped cross section. The bottom opening and top opening of the gradually narrowing crushing cylinder (4) are connected to the bottom cylinder (1) and the crushing cylinder (4) respectively through flanges.

3. The air jet mill for lithium iron phosphate production according to claim 1, characterized in that: The grading cylinder (5) is provided with a receiving chamber (51). The receiving chamber (51) is cylindrical and installed on the top of the grading cylinder (5). The outer wall of the receiving chamber (51) is evenly provided with receiving ports (52) that connect to the discharge ends of multiple grading wheels (6). The receiving pipe (8) is installed on the top of the grading cylinder (5) and communicates with the receiving chamber (51).

4. The air jet mill for lithium iron phosphate production according to claim 1, characterized in that: The grading cylinder (5) extends coaxially into the receiving port (52) of the receiving chamber (51), and the outer wall of the grading cylinder (5) is suspended in the receiving port (52) with a gap between it and the inner wall of the receiving port (52).

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