A flash dryer for the production of iron phosphate battery material

Abstract

This invention discloses a flash dryer for preparing iron phosphate battery materials, relating to the field of iron phosphate battery production. The flash dryer includes a pulverizing and drying mechanism, a cyclone separation system, and a dust removal system, which are connected sequentially. In this flash dryer, ultrafine powder material follows the airflow through the vortex inlet into the dust collection hopper, directly acting on the rotor. This causes the rotating frame to rotate, cleaning the brushes at the bottom of the filter cartridge. Simultaneously, as the airflow flows upwards, if the filter cartridge becomes clogged, causing airflow obstruction, the bottom air pressure increases, blowing air upwards onto the movable plate and filter cartridge. This causes the movable plate and filter cartridge to shake up and down, and the high-elasticity memory spring amplifies the shaking amplitude, shaking off the powder from the filter screen and delaying clogging of the filter cartridge.

Description

Technical Field

[0001] This invention relates to the field of iron phosphate battery production and processing technology, specifically to a flash dryer for preparing iron phosphate battery materials. Background Technology

[0002] A lithium iron phosphate battery is a type of battery that uses lithium iron phosphate as the main positive electrode material. During production, it is usually necessary to mix lithium iron phosphate, lithium salt and conductive agent. In order to ensure that the materials are mixed evenly and the conductivity of the finished product is excellent, it is usually necessary to wet mix the lithium iron phosphate, lithium salt and conductive agent, and then dry and grind them. This process is now mostly completed using a flash dryer.

[0003] The effect of a flash dryer is to complete the crushing, grinding, and drying of materials in a closed, continuous space. Simultaneously, a dust removal mechanism at the tail end ensures that the exhaust air is purified and pollution-free, while also reducing material loss. However, in actual operation, the dust removal mechanism usually uses a filter element. During continuous operation, as more and more powder material adheres to the surface of the filter element, the airflow permeability decreases, thus affecting the gas discharge rate. This leads to a decrease in the effectiveness of the front-end pneumatic conveying and material accumulation in the intermediate components. Therefore, a flash dryer for preparing iron phosphate battery materials is provided to solve the above problems. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this invention provides a flash dryer for preparing iron phosphate battery materials. It solves the problem that existing flash dryers, which typically use a filter element to remove dust at the tail end, suffer from reduced airflow permeability as more powder adheres to the filter element during continuous operation. This affects the gas discharge rate, leading to a decrease in the effectiveness of the pneumatic conveying at the front end and material accumulation in the transfer components.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, the present invention is implemented through the following technical solution: a flash dryer for preparing iron phosphate battery materials, comprising a pulverizing and drying mechanism, a cyclone separation system and a dust removal system, wherein the pulverizing and drying mechanism, the cyclone separation system and the dust removal system are connected in sequence, the pulverizing and drying mechanism includes a pulverizing and drying chamber and a feeding hopper installed on the outer wall of the pulverizing and drying chamber, and an air intake fan is installed on the bottom side of the pulverizing and drying chamber;

[0008] The cyclone separation system includes a first separation chamber and a second separation chamber;

[0009] The dust removal system includes a dust collection hopper and a negative pressure fan installed at the end of the dust collection hopper;

[0010] The dust collector is equipped with a filtration mechanism inside, and the filtration mechanism includes:

[0011] A filter cartridge, multiple filter cartridges are arranged inside the dust collector, and the filter cartridges vibrate up and down;

[0012] A wind-powered cleaning component is installed at the bottom of the filter cylinder, and the wind-powered cleaning component uses internal high-speed airflow to rotate and clean the bottom of the filter cylinder.

[0013] Preferably, the wind-powered cleaning component includes;

[0014] Support ring, which is welded to the inside of the dust collector hopper;

[0015] A rotating frame, which is rotatably connected to the bottom of a support ring;

[0016] Rotor, which is welded to the bottom of the rotating frame;

[0017] Brush bristles, which are mounted on the top of the rotating frame.

[0018] Preferably, a pulverizer is installed at the bottom of the pulverizing and drying chamber, and an electric heater is installed on the side of the pulverizer. The electric heater is connected to the output end of the air intake fan.

[0019] Preferably, a support frame is installed at the bottom of the crusher, and a screw feeder is installed at the top of the support frame. The discharge end of the screw feeder is connected to the inside of the crushing and drying chamber, and the feed hopper is installed at the feed end of the screw feeder.

[0020] Preferably, a conveying pipe is installed between the first separation chamber and the second separation chamber, the first separation chamber is connected to the top of the crusher, a suspended support is installed at the bottom of the first separation chamber, and a first discharge valve is installed at the bottom of both the first and second separation chambers.

[0021] Preferably, the outer surface of the dust collector is equipped with a screw-in feed port, which is directly opposite the rotor. The outer surface of the dust collector is also equipped with an exhaust pipe, the other end of which is connected to a negative pressure fan.

[0022] Preferably, the output end of the negative pressure fan is equipped with an exhaust pipe, the bottom outer surface of the dust collector is equipped with a fixing frame, the top of the dust collector is equipped with a sealing cover, and the bottom of the dust collector is equipped with a second discharge valve.

[0023] Preferably, a carrier plate is fixedly welded inside the dust collector hopper, the carrier plate is located above the screw-in feed port, a movable plate is provided above the carrier plate, the movable plate is slidably connected inside the dust collector hopper, the top end of the filter cylinder is threadedly connected to the movable plate, and the bottom end of the filter cylinder is movably inserted into the inside of the carrier plate.

[0024] Preferably, a T-shaped shaft is fixedly connected to the bottom of the movable plate, the T-shaped shaft movably passes through the carrier plate, and a high-elasticity memory spring is movably sleeved on the outer surface of the middle part of the T-shaped shaft, with the two ends of the high-elasticity memory spring abutting against the carrier plate and the movable plate respectively.

[0025] Preferably, a rotating shaft is fixedly connected to the middle of the rotating frame, and the top end of the rotating shaft is rotatably connected to the bottom of the carrier plate. Filter screens are provided inside both ends of the filter cylinder, and the brush bristles are in contact with the surface of the filter screen below.

[0026] This invention discloses a flash dryer for preparing iron phosphate battery materials, which has the following beneficial effects:

[0027] 1. This flash dryer for preparing iron phosphate battery materials allows ultrafine powder materials to enter the dust collector through the vortex feed inlet following the airflow. At this time, the airflow is vortex-driven and directly acts on the rotor, causing the rotating frame to rotate. Meanwhile, the brush bristles on the top of the rotating frame rotate at the bottom of the filter cylinder to clean the filter screen at the bottom.

[0028] 2. This flash dryer for preparing iron phosphate battery materials, during the upward discharge of airflow through the filter cartridge, when the filter cartridge becomes clogged and the airflow is obstructed, the bottom air pressure increases, blowing air upward onto the movable plate and filter cartridge. Then, the movable plate and filter cartridge will fall due to their weight, causing the airflow to become unstable. This causes the movable plate and filter cartridge to shake up and down, and the high-elasticity memory spring increases the amplitude of the shaking, thereby achieving up-and-down vibration. This shakes off the powder in the filter screen, thus achieving self-cleaning during use and delaying the clogging of the filter cartridge.

[0029] 3. The flash dryer for preparing iron phosphate battery materials involves feeding a mixture of iron phosphate, lithium salt, and conductive agent into the feed hopper, then conveying it to the crushing and drying chamber by starting a screw feeder. Hot air is blown in by an air intake fan and an electric heater, while the material is crushed by a crusher. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the overall front structure of the present invention;

[0032] Figure 2 This is a schematic diagram of the overall rear structure of the present invention;

[0033] Figure 3 This is a schematic diagram of the external structure of the pulverizing and drying mechanism of the present invention;

[0034] Figure 4 This is a schematic diagram of the external structure of the cyclone separation system of the present invention;

[0035] Figure 5 This is a schematic diagram of the external structure of the dust removal system of the present invention;

[0036] Figure 6 This is a cross-sectional view of the internal structure of the dust collector hopper of the present invention;

[0037] Figure 7 This is a schematic diagram of the outer surface structure of the filtration mechanism of the present invention;

[0038] Figure 8 This is a schematic diagram of the bottom structure of the filtration mechanism of the present invention;

[0039] Figure 9 This is a schematic diagram of the outer surface structure of the wind-powered cleaning component of the present invention.

[0040] In the diagram: 1. Crushing and drying mechanism; 101. Crushing and drying chamber; 102. Support frame; 103. Crusher; 104. Electric heater; 105. Inlet fan; 106. Screw feeder; 107. Feed hopper; 2. Cyclone separation system; 201. First separation chamber; 202. Second separation chamber; 203. Conveying pipe; 204. Suspended support; 205. First discharge valve; 3. Dust removal system; 31. Dust hopper; 32. Cyclone... 33. Feed inlet; 34. Fixed frame; 35. Exhaust pipe; 36. Negative pressure fan; 37. Exhaust stack; 38. Sealing cover; 49. Second discharge valve; 40. Filtering mechanism; 41. Carrier plate; 42. Movable plate; 43. Filter cylinder; 44. Filter screen; 45. High-elasticity memory spring; 46. Wind-powered cleaning assembly; 461. Support ring; 462. Rotating frame; 463. Brush bristles; 464. Rotor; 465. Rotating shaft; 47. T-shaped shaft. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are described clearly and completely. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] This application provides a flash dryer for preparing iron phosphate battery materials, which solves the problem that existing flash dryers have a dust removal mechanism at the tail end, which is usually implemented by a filter element. During continuous operation, as more and more powder material adheres to the surface of the filter element, the airflow permeability decreases, thereby affecting the gas discharge rate, resulting in a decrease in the effect of front-end pneumatic conveying, and the accumulation of materials in the transfer components.

[0043] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0044] This invention discloses a flash dryer for preparing iron phosphate battery materials.

[0045] According to the appendix Figure 1-9 As shown, it includes a crushing and drying mechanism 1, a cyclone separation system 2, and a dust removal system 3. The crushing and drying mechanism 1, the cyclone separation system 2, and the dust removal system 3 are connected in sequence. The crushing and drying mechanism 1 includes a crushing and drying chamber 101 and a feed hopper 107 installed on the outer wall of the crushing and drying chamber 101. An air intake fan 105 is installed on the bottom side of the crushing and drying chamber 101. A grading ring is set at the top inside the crushing and drying mechanism 1 to separate materials of different particle sizes and ensure that the particle size of the discharged material meets the requirements.

[0046] Cyclone separation system 2 includes a first separation chamber 201 and a second separation chamber 202;

[0047] The dust removal system 3 includes a dust collection hopper 31 and a negative pressure fan 35 installed at the end of the dust collection hopper 31;

[0048] The dust collector 31 is equipped with a filter mechanism 4, which includes:

[0049] Filter cartridge 43, multiple filter cartridges 43 are arranged inside the dust collector 31, and the filter cartridges 43 vibrate up and down;

[0050] The wind-powered cleaning component 46 is located at the bottom of the filter cartridge 43. The wind-powered cleaning component 46 uses the internal high-speed airflow to rotate and clean the bottom of the filter cartridge 43.

[0051] Wind-powered cleaning component 46 includes;

[0052] Support ring 461 is welded to the inside of dust collector 31;

[0053] Rotating frame 462 is rotatably connected to the bottom of support ring 461;

[0054] Rotor 464 is welded to the bottom of rotating frame 462;

[0055] Brush 463 is mounted on top of rotating frame 462 and is made of high-temperature resistant hard plastic.

[0056] A pulverizer 103 is installed at the bottom of the pulverizing and drying chamber 101. An electric heater 104 is installed on the side of the pulverizer 103. The electric heater 104 is connected to the output end of the air intake fan 105. The electric heater 104 is an electric heating unit used to heat the air blown in by the air intake fan 105.

[0057] A support frame 102 is installed at the bottom of the crusher 103, and a screw feeder 106 is installed at the top of the support frame 102. The discharge end of the screw feeder 106 is connected to the inside of the crushing and drying chamber 101, and the feed hopper 107 is installed at the feed end of the screw feeder 106.

[0058] A conveying pipe 203 is installed between the first separation chamber 201 and the second separation chamber 202. The first separation chamber 201 is connected to the top of the crusher 103. A suspension bracket 204 is installed at the bottom of the first separation chamber 201. A first discharge valve 205 is installed at the bottom of both the first separation chamber 201 and the second separation chamber 202.

[0059] The outer surface of the dust collector 31 is equipped with a screw-in inlet 32, which is directly opposite the rotor 464. The outer surface of the dust collector 31 is equipped with an exhaust pipe 34, and the other end of the exhaust pipe 34 is connected to the negative pressure fan 35.

[0060] An exhaust pipe 36 is installed at the output end of the negative pressure fan 35, a fixing frame 33 is installed on the bottom outer surface of the dust collection hopper 31, a sealing cover 37 is installed on the top of the dust collection hopper 31, and a second discharge valve 38 is installed at the bottom of the dust collection hopper 31.

[0061] A carrier plate 41 is fixedly welded inside the dust collector 31. The carrier plate 41 is located above the feed inlet 32. A movable plate 42 is provided above the carrier plate 41. The movable plate 42 is slidably connected inside the dust collector 31. The top of the filter cylinder 43 is threadedly connected to the movable plate 42, and the bottom of the filter cylinder 43 is movably inserted into the inside of the carrier plate 41.

[0062] A T-shaped shaft 47 is fixedly connected to the bottom of the movable plate 42. The T-shaped shaft 47 movably passes through the carrier plate 41, and a high-elasticity memory spring 45 is movably sleeved on the outer surface of the middle part of the T-shaped shaft 47. The two ends of the high-elasticity memory spring 45 abut against the carrier plate 41 and the movable plate 42 respectively.

[0063] A rotating shaft 465 is fixedly connected to the middle of the rotating frame 462. The top end of the rotating shaft 465 is rotatably connected to the bottom of the carrier plate 41. Filter screens 44 are provided inside both ends of the filter cylinder 43. The bristles 463 are in contact with the surface of the filter screen 44 below.

[0064] Working principle: When in use, the device feeds a mixture of iron phosphate, lithium salt and conductive agent into the feed hopper 107, and then the screw conveyor 106 is started to transport it into the crushing and drying chamber 101. Hot air is blown in by the air intake fan 105 and the electric heater 104, while the material is crushed by the crusher 103. After the material is dried and crushed, it is pneumatically conveyed to the outside through the grading ring at the top of the crushing and drying chamber 101. The material is deposited and discharged in sequence through the first separation chamber 201 and the second separation chamber 202. Then, some of the very small particles enter the dust removal hopper 31 and are filtered through multiple filter cartridges 43. The filtered gas is extracted to the outside by the negative pressure fan 35, thus completing the processing of iron phosphate battery materials.

[0065] Furthermore, during the above operation, the ultrafine powder material follows the airflow into the dust collector 31 through the vortex inlet 32. At this time, the airflow is vortex-driven and directly acts on the rotor 464, causing the rotating frame 462 to rotate. Meanwhile, the bristles 463 at the top of the rotating frame 462 rotate at the bottom of the filter cylinder 43, cleaning the bottom filter screen 44. Simultaneously, as the airflow is discharged upward through the filter cylinder 43, if the filter cylinder 43 becomes blocked, causing the airflow to be obstructed, the bottom air pressure increases, blowing air upward onto the movable plate 42 and the filter cylinder 43. Then, the movable plate 42 and the filter cylinder 43 will fall due to their weight, causing the airflow to become unstable. This causes the movable plate 42 and the filter cylinder 43 to shake up and down, and the high-elasticity memory spring 45 increases the amplitude of the shaking, thereby achieving up and down vibration. This shakes off the powder in the filter screen 44, thus achieving self-cleaning during use and delaying the clogging of the filter cylinder 43.

[0066] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A flash dryer for preparing iron phosphate battery materials, comprising a pulverizing and drying mechanism (1), a cyclone separation system (2), and a dust removal system (3), wherein the pulverizing and drying mechanism (1), the cyclone separation system (2), and the dust removal system (3) are connected in sequence, characterized in that, The crushing and drying mechanism (1) includes a crushing and drying chamber (101) and a feeding hopper (107) installed on the outer wall of the crushing and drying chamber (101). An air intake fan (105) is installed on the bottom side of the crushing and drying chamber (101). The cyclone separation system (2) includes a first separation chamber (201) and a second separation chamber (202); The dust removal system (3) includes a dust collection hopper (31) and a negative pressure fan (35) installed at the end of the dust collection hopper (31). The dust collection hopper (31) is provided with a filter mechanism (4), which includes: A filter cartridge (43), a plurality of the filter cartridges (43) are disposed inside the dust collection hopper (31), and the filter cartridges (43) vibrate up and down; Wind-powered cleaning component (46) is disposed at the bottom of filter cylinder (43). The wind-powered cleaning component (46) uses internal high-speed airflow to rotate and clean the bottom of filter cylinder (43). The dust collector (31) is fixedly welded to the inside of a carrier plate (41). The carrier plate (41) is located above the feed inlet (32). A movable plate (42) is provided above the carrier plate (41). The movable plate (42) is slidably connected to the inside of the dust collector (31). The top of the filter cylinder (43) is threadedly connected to the movable plate (42). The bottom of the filter cylinder (43) is movably inserted into the inside of the carrier plate (41). A T-shaped shaft (47) is fixedly connected to the bottom of the movable plate (42). The T-shaped shaft (47) movably passes through the carrier plate (41). A high-elasticity memory spring (45) is movably sleeved on the outer surface of the middle part of the T-shaped shaft (47). The two ends of the high-elasticity memory spring (45) abut against the carrier plate (41) and the movable plate (42) respectively.

2. The flash dryer for preparing iron phosphate battery materials according to claim 1, characterized in that: The wind-powered cleaning component (46) includes; A support ring (461) is welded to the inside of the dust collection hopper (31); A rotating frame (462) is rotatably connected to the bottom of a support ring (461); A rotor (464) is welded to the bottom of a rotating frame (462); Brush bristles (463) are mounted on top of the rotating frame (462).

3. The flash dryer for preparing iron phosphate battery materials according to claim 1, characterized in that: A pulverizer (103) is installed at the bottom of the pulverizing and drying chamber (101), and an electric heater (104) is installed on the side of the pulverizer (103). The electric heater (104) is connected to the output end of the air intake fan (105).

4. A flash dryer for preparing iron phosphate battery materials according to claim 3, characterized in that: The bottom of the crusher (103) is equipped with a support frame (102), and the top of the support frame (102) is equipped with a screw feeder (106). The discharge end of the screw feeder (106) is connected to the inside of the crushing and drying chamber (101), and the feed hopper (107) is installed at the feed end of the screw feeder (106).

5. A flash dryer for preparing iron phosphate battery materials according to claim 4, characterized in that: A conveying pipe (203) is installed between the first separation chamber (201) and the second separation chamber (202). The first separation chamber (201) is connected to the top of the crusher (103). A suspension bracket (204) is installed at the bottom of the first separation chamber (201). A first discharge valve (205) is installed at the bottom of both the first separation chamber (201) and the second separation chamber (202).

6. A flash dryer for preparing iron phosphate battery materials according to claim 2, characterized in that: The outer surface of the dust collector (31) is equipped with a screw-in inlet (32), which is directly opposite the rotor (464). The outer surface of the dust collector (31) is equipped with an exhaust pipe (34), and the other end of the exhaust pipe (34) is connected to a negative pressure fan (35).

7. A flash dryer for preparing iron phosphate battery materials according to claim 6, characterized in that: The output end of the negative pressure fan (35) is equipped with an exhaust pipe (36), the bottom outer surface of the dust collector (31) is equipped with a fixing frame (33), the top of the dust collector (31) is equipped with a sealing cover (37), and the bottom of the dust collector (31) is equipped with a second discharge valve (38).

8. A flash dryer for preparing iron phosphate battery materials according to claim 2, characterized in that: A rotating shaft (465) is fixedly connected to the middle of the rotating frame (462). The top end of the rotating shaft (465) is rotatably connected to the bottom of the carrier plate (41). Filter screens (44) are provided inside both ends of the filter cylinder (43). The bristles (463) are in contact with the surface of the filter screen (44) below.

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