Jet mill for processing lithium iron phosphate

Abstract

The utility model discloses a jet mill for processing lithium iron phosphate, and belongs to the field of jet mills. A jet mill for lithium iron phosphate processing comprises a shell with an air inlet pipe, a contact disc is fixedly connected to the bottom in the shell, a rotating shaft is rotationally connected to the contact disc, blades are fixedly connected to the rotating shaft and are in a wing shape, an air outlet channel is formed between the contact disc and the shell, and an air ejector pipe is arranged in the air outlet channel and is in a spiral shape. The air spraying end of the air spraying pipe faces the air outlet direction of the air inlet pipe; compared with the prior art, the lithium iron phosphate raw material falling to the inner bottom of the shell can be blown by utilizing the blades to be matched with the air injection pipe, the lithium iron phosphate raw material is stirred at the same time, then the lithium iron phosphate raw material is blown to the position above the air inlet pipe again, and then the lithium iron phosphate raw material falling to the inner bottom of the shell can be blown up again; and airflow processing and grinding can be repeated, so that the crushing effect of the raw materials is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of air flow mills, in particular to an air flow mill for processing lithium iron phosphate. Background Art

[0002] At present, before making or producing lithium iron phosphate batteries, the raw materials need to be stirred. The main purpose is to prepare positive and negative electrode slurries. The positive electrode material composed of active material graphene composite conductive agent, binder, etc. and the negative electrode material composed of active material graphene composite conductive agent, binder and dispersant, etc. are mixed evenly respectively, and then stirred after adding solvent to form graphene composite lithium iron phosphate positive electrode slurry and graphene modified negative electrode slurry, and then the coating process is carried out. In the processing step of lithium iron phosphate, an air flow mill is needed to process and shape it. The principle is that the lithium iron phosphate raw material meets the high-speed air flow, and a rotating air vortex is formed due to the inertia of the gas. The lithium iron phosphate raw material is dispersed and continuously ground in this air vortex. After multiple grindings, it reaches the required particle size and particle size distribution. The lithium iron phosphate raw material is finally ground into the target particle size and carried to the collector by the air flow for collection, and then used for subsequent positive electrode sheet production.

[0003] In the prior art, when the air jet mill is in use, when the lithium iron phosphate raw material falls to the bottom of the device, it is difficult for the internal air supply equipment to blow up the lithium iron phosphate raw material, and it cannot be repeatedly processed, which easily leads to incomplete crushing of the lithium iron phosphate raw material. Utility Model Content

[0004] The purpose of the utility model is to solve the problem in the prior art that when the lithium iron phosphate raw material falls to the bottom of the device, the internal air supply equipment is difficult to blow up the lithium iron phosphate raw material, and it is impossible to process it repeatedly, which easily leads to incomplete crushing of the lithium iron phosphate raw material. A jet mill for processing lithium iron phosphate is proposed.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A jet mill for processing lithium iron phosphate includes a shell with an air inlet pipe, a contact disk fixedly connected to the bottom of the shell, a rotating shaft rotatably connected to the contact disk, and a blade fixedly connected to the rotating shaft, wherein the blade is wing-shaped. An air outlet channel is formed between the contact disk and the shell, and an air jet pipe is provided in the air outlet channel. The air jet pipe is spiral-shaped, and the air jet end of the air jet pipe is oriented toward the air outlet direction of the air inlet pipe.

[0007] In order to facilitate air supply to the air injection pipe, preferably, an air supply pipe is fixedly connected to the air outlet channel, and the air injection pipe is communicated with the air supply pipe.

[0008] In order to facilitate the rotation of the rotating shaft, preferably, a boost plate is fixedly connected to the contact plate, and the rotating shaft extends to the boost plate and is fixedly connected to a turbine blade, one side of the boost plate is connected to the intake pipe through a pipe, and the other side of the boost plate is fixedly connected to the air supply pipe through a pipe.

[0009] In order to improve the airflow collision effect of the lithium iron phosphate in the housing, preferably, a spiral plate is fixedly connected to the inner wall of the housing, and the spiral plate cooperates with the air intake pipe.

[0010] In order to reduce the amount of lithium iron phosphate falling to the bottom of the housing, preferably, a feed pipe is fixedly connected to the housing, and the discharge end of the feed pipe is arranged above the air inlet pipe.

[0011] In order to facilitate classification and collection of the lithium iron phosphate, preferably, a classification impeller is rotatably connected in the housing, and the classification impeller cooperates with the adsorption end of the collector.

[0012] Compared with the prior art, the present invention provides a jet mill for processing lithium iron phosphate, which has the following beneficial effects:

[0013] 1. The jet mill for processing lithium iron phosphate will produce eddy currents at the end of the blades, which will stir the falling lithium iron phosphate raw materials, thereby improving the grinding effect of the lithium iron phosphate raw materials;

[0014] 2. The jet mill for processing lithium iron phosphate uses an air jet pipe to make the ejected gas rise in a spiral pattern along the inner wall of the shell. At this time, the blades will cooperate with the air jet pipe to blow the lithium iron phosphate raw material, and at the same time stir the lithium iron phosphate raw material, and then blow the lithium iron phosphate raw material back to the top of the air intake pipe, and then the lithium iron phosphate raw material that falls to the bottom of the shell can be blown up again, so that it can be repeatedly processed and ground by air flow to improve the crushing effect of the raw material;

[0015] 3. The jet mill for processing lithium iron phosphate has a spiral plate on the inner wall of the shell. When the air intake pipe grinds the lithium iron phosphate raw material, the lithium iron phosphate raw material will move and collide with the outside of the spiral plate, thereby improving the grinding effect of the lithium iron phosphate raw material.

[0016] The parts not involved in the device are the same as the existing technology or can be implemented by using the existing technology. The utility model can use blades in conjunction with the air jet tube to blow the lithium iron phosphate raw material that falls to the bottom of the shell, stir the lithium iron phosphate raw material at the same time, and then blow the lithium iron phosphate raw material back to the top of the air intake pipe, and then the lithium iron phosphate raw material that falls to the bottom of the shell can be blown up again, so that it can be repeatedly processed and ground by air flow to improve the crushing effect of the raw material. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a three-dimensional schematic diagram of a jet mill for processing lithium iron phosphate proposed in the present invention;

[0018] Figure 2 This is a schematic structural diagram of a spiral plate of a jet mill for processing lithium iron phosphate proposed in the present invention;

[0019] Figure 3 This is a schematic diagram of a contact disc for an air flow mill used for processing lithium iron phosphate, as proposed in the present invention;

[0020] Figure 4 This is a schematic cross-sectional structural diagram of an air flow mill for processing lithium iron phosphate proposed in the present invention.

[0021] In the figure: 1. outer shell; 101. feed pipe; 102. air intake pipe; 2. contact plate; 3. rotating shaft; 301. blade; 4. boost plate; 401. turbine blade; 5. air delivery pipe; 6. jet pipe; 7. spiral plate. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0023] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0024] Example:

[0025] Reference Figure 1-Figure 4 A jet mill for processing lithium iron phosphate includes a shell 1 with an air inlet pipe 102. The shell 1 is fixedly connected to an inclined air inlet pipe 102, and the air flow ejected by the air inlet pipe 102 is a high-speed air flow, which can be supplied by an air pump or a fan. A feed pipe 101 is also fixedly connected to the shell 1, and the discharge end of the feed pipe 101 is arranged above the air inlet pipe 102.

[0026] It needs to be explained here that lithium iron phosphate is a positive electrode material. In the processing steps of lithium iron phosphate, lithium iron phosphate is transported to the outer shell 1 through the feed pipe 101, and then the switch of the intake pipe 102 is started. At this time, the lithium iron phosphate raw material meets the high-speed airflow. Since the high-speed gas ejected from the intake pipe 102 has a certain inertia, a rotating air vortex will be formed in the outer shell 1. The lithium iron phosphate raw material is dispersed and continuously ground in this air vortex. After multiple grindings, it reaches the required particle size and particle size distribution, and a grading impeller is connected to rotate in the outer shell 1. The grading impeller will classify the particle size of the lithium iron phosphate raw material, and then the qualified lithium iron phosphate raw material will be finally ground into the target particle size and carried to the collector by the airflow for collection, and then used for subsequent positive electrode sheet production.

[0027] In addition, a contact disk 2 is fixedly connected to the bottom of the outer shell 1. When the lithium iron phosphate raw material falls into the bottom of the outer shell 1, the top of the contact disk 2 can support the lithium iron phosphate raw material, and a rotating shaft 3 is rotatably connected to the contact disk 2. A blade 301 is fixedly connected to the rotating shaft 3, and the blade 301 is wing-shaped. When the rotating shaft 3 rotates, the blade 301 will rotate. At this time, a vortex will appear at the end of the blade 301, which will stir the falling lithium iron phosphate raw material. In this process, the grinding effect of the lithium iron phosphate raw material will be improved.

[0028] A boost disc 4 is fixedly connected to the contact disc 2, and a turbine blade 401 is fixedly connected to the rotating shaft 3 extending into the boost disc 4. One side of the boost disc 4 is connected to the intake pipe 102 through a pipe. When the intake pipe 102 ejects a high-speed airflow, a part of the airflow will enter the boost disc 4 to rotate the turbine blade 401 in the boost disc 4. During the rotation of the turbine blade 401, it will drive the rotating shaft 3 to rotate, and then the rotating shaft 3 can drive the blade 301 to rotate.

[0029] Moreover, an air outlet channel is formed between the contact disc 2 and the outer shell 1, and an air jet pipe 6 is provided in the air outlet channel, and the air jet pipe 6 is spiral-shaped. In addition, the other side of the boosting disc 4 is fixedly connected to the gas pipe 5 through a pipe, and a one-way valve is provided on the pipe to prevent gas backflow. By transporting the gas in the boosting disc 4 to the inside of the gas pipe 5, the air jet pipe 6 can be supplied with gas.

[0030] When the jet pipe 6 sprays, the ejected gas will rise in a spiral pattern along the inner wall of the shell 1. At this time, the blades 301 will cooperate with the jet pipe 6 to blow the lithium iron phosphate raw material, stir the lithium iron phosphate raw material, and then blow the lithium iron phosphate raw material back to the top of the intake pipe 102, and then the lithium iron phosphate raw material that falls to the bottom of the shell 1 can be blown up again, so that it can be repeatedly processed and ground by air flow to improve the crushing effect of the raw material.

[0031] In addition, a spiral plate 7 is fixedly connected to the inner wall of the outer shell 1, and the spiral direction of the spiral plate 7 is opposite to the jet rotation direction of the jet pipe 6. When the intake pipe 102 grinds the lithium iron phosphate raw material, the lithium iron phosphate raw material will move and collide with the outside of the spiral plate 7, thereby improving the grinding effect of the lithium iron phosphate raw material.

[0032] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A jet mill for processing lithium iron phosphate, comprising a housing (1) with an air inlet pipe (102), characterized in that: A contact disc (2) is fixedly connected to the bottom of the housing (1), a rotating shaft (3) is rotatably connected to the contact disc (2), a blade (301) is fixedly connected to the rotating shaft (3), and the blade (301) is wing-shaped. An air outlet channel is formed between the contact disc (2) and the housing (1), and an air jet pipe (6) is provided in the air outlet channel. The air jet pipe (6) is spiral-shaped, and the air jet end of the air jet pipe (6) faces the air outlet direction of the air inlet pipe (102).

2. The jet mill for processing lithium iron phosphate according to claim 1, characterized in that: An air delivery pipe (5) is fixedly connected to the air outlet channel, and the air injection pipe (6) is communicated with the air delivery pipe (5).

3. The jet mill for processing lithium iron phosphate according to claim 2, characterized in that: A boost disc (4) is fixedly connected to the contact disc (2), a turbine blade (401) is fixedly connected to the rotating shaft (3) extending into the boost disc (4), one side of the boost disc (4) is connected to an air intake pipe (102) via a pipe, and the other side of the boost disc (4) is fixedly connected to an air delivery pipe (5) via a pipe.

4. The jet mill for processing lithium iron phosphate according to claim 1, characterized in that: A spiral plate (7) is fixedly connected to the inner wall of the outer shell (1), and the spiral plate (7) is matched with the air inlet pipe (102).

5. The jet mill for processing lithium iron phosphate according to claim 4, characterized in that: A feed pipe (101) is fixedly connected to the housing (1), and the discharge end of the feed pipe (101) is arranged above the air inlet pipe (102).

6. The jet mill for processing lithium iron phosphate according to claim 1, characterized in that: A grading impeller is rotatably connected in the outer shell (1), and the grading impeller cooperates with the adsorption end of the collector.

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