Drying device for lithium iron phosphate preparation

Abstract

The present application relates to the technical field of lithium iron phosphate preparation, and particularly relates to a drying device for lithium iron phosphate preparation, which comprises a drying tank, a flattening mechanism arranged in the drying tank, a storage box arranged on the top of the drying tank, and a feeding part arranged on the outer periphery of the drying tank and used for conveying wet lithium iron phosphate in the storage box into the storage box. The feeding part comprises a feeding pipe which is arranged on the outer periphery of the drying tank in an inclined manner. When the wet lithium iron phosphate flows into the feeding cavity, the wet lithium iron phosphate is gradually compacted in the feeding cavity under the drive of the auger rod. The water squeezed out of the compacted wet lithium iron phosphate flows into the auger rod through the water filtering net in the filter hole of the auger rod and is discharged outward, so that the wet lithium iron phosphate is preliminarily drained in the process of being conveyed to the drying tank, and the efficiency of subsequent drying of the lithium iron phosphate is improved.

Description

Technical Field

[0001] This invention relates to the field of lithium iron phosphate preparation technology, and in particular to a drying apparatus for lithium iron phosphate preparation. Background Technology

[0002] Lithium iron phosphate electrode materials are mainly used in various lithium-ion batteries. Due to its stable structure, lithium iron phosphate has gradually become the best positive electrode material for power batteries in electric vehicles. When preparing lithium iron phosphate, iron phosphate and lithium carbonate need to be mixed in a certain proportion to form a wet material, which then needs to be dried.

[0003] Patent application number CN202220087215.1 discloses a lithium iron phosphate drying device, including a main body with a feed inlet at the top; a hot air drying system installed on one side of the inner wall of the main body; and a side-inclined heating system installed on the inner wall of the main body and located below the hot air drying system.

[0004] When the above-mentioned patent is used, because the wet lithium iron phosphate material contains a large amount of moisture, it takes a long time for workers to directly feed the wet lithium iron phosphate material into the main body for drying. This results in poor drying efficiency of the drying device for lithium iron phosphate and makes it impossible to perform a pre-draining step on the wet lithium iron phosphate material transported into the drying main body. Summary of the Invention

[0005] In view of this, the purpose of this invention is to provide a drying apparatus for the preparation of lithium iron phosphate, so as to solve the problem of poor drying efficiency of existing lithium iron phosphate drying apparatuses.

[0006] To achieve the above objectives, the present invention provides a drying apparatus for the preparation of lithium iron phosphate, comprising a drying tank, wherein a flattening mechanism is provided inside the drying tank, including:

[0007] The storage tank is located at the top of the drying tank; the feeding section is located on the outer periphery of the drying tank and is used to transport the wet lithium iron phosphate material in the storage tank into the storage tank.

[0008] The feeding section includes a feeding pipe, which is inclinedly arranged on the outer periphery of the drying tank. The end of the feeding pipe away from the drying tank is the low end, and the end closer to the drying tank is the high end. A baffle is installed inside the feeding pipe, which divides the feeding pipe into a feeding chamber on one side closer to the drying tank and a drainage chamber on the other side. The inner cavity of the feeding chamber is tapered, with the end closer to the baffle being the thick end and the end away from the baffle being the narrow end, which serves as the discharge end and communicates with the drying tank. A hollow auger rod is installed inside the feeding chamber, which passes through the baffle and is rotatably connected to the baffle. A drive motor for driving the auger rod to rotate is installed at the end of the feeding pipe. The rotation of the auger rod transports the wet material from the thick section to the narrow end and compresses the wet material, so that the wet material forms a high-density plug at the discharge end.

[0009] The feeding pipe has a feeding hole, which is connected to the feeding chamber and close to the partition. The feeding hole is connected to a conveying pipe, and the other end of the conveying pipe is connected to the storage box. The feeding pipe also has a drain hole, which is connected to the drain chamber.

[0010] The auger rod is adapted to the inner wall of the feeding chamber in a tapered manner. The auger rod is equipped with auger blades and has filter holes. A water filter screen is installed in the filter holes. The auger rod has water outlet holes on its outer periphery in the drainage chamber.

[0011] A sealing plate is slidably connected to the inner wall of the drying tank to seal the discharge end of the feeding pipe. A connecting component is provided inside the drying tank to drive the sealing plate to move and release the seal on the discharge end.

[0012] Furthermore, there are at least two sets of feeding sections, which are equidistantly arranged on the outer periphery of the drying tank.

[0013] Furthermore, it also includes a liquid storage tank, which is disposed on the outer periphery of the drying tank.

[0014] Furthermore, a drain pipe is connected to the drain hole, and the other end of the drain pipe is connected to the storage tank.

[0015] Furthermore, the flattening mechanism includes a stirring rod disposed inside the drying tank. A drive assembly for driving the stirring rod to rotate is disposed inside the drying tank. At least one set of pressure rollers is rotatably connected to the outer periphery of the bottom of the stirring rod. The drive assembly drives the stirring rod to rotate, and the stirring rod drives the pressure rollers to move and flatten the lithium iron phosphate at the bottom of the inner cavity of the drying tank.

[0016] Furthermore, the drive assembly includes a horizontal plate, which is disposed inside the drying tank to divide the drying tank into a drying chamber and an equipment chamber. A servo motor is disposed inside the equipment chamber. The output rod of the servo motor passes downward through the horizontal plate and is rotatably connected to the horizontal plate through a sealed bearing. The bottom end of the output rod is fixedly connected to the top end of the stirring rod.

[0017] Furthermore, the stirring rod is an electrically telescopic rod used to drive the pressure roller to move down to the working surface.

[0018] Furthermore, the connecting assembly includes a fixed ring, which is rotatably sleeved on the fixed rod of the electric telescopic rod. A spring is connected to the bottom surface of the fixed ring, and a sliding ring is connected to the bottom end of the spring. The sliding ring can slide up and down on the outer periphery of the electric telescopic rod. A push ring is sleeved on the movable rod of the electric telescopic rod. The push ring is located at the bottom of the sliding ring, and the diameter of the push ring is larger than the inner diameter of the sliding ring. At least one set of connecting rods is fixedly connected to the outer periphery of the sliding ring, and the other end of the connecting rod is fixedly connected to the inner periphery of the sealing plate.

[0019] Furthermore, the bottom of the sealing ring is shaped like a ring blade.

[0020] Furthermore, a solenoid valve is installed on the conveying pipe.

[0021] The beneficial effects of the present invention are as follows: As can be seen from the above description, the drying device for preparing lithium iron phosphate provided by the present invention, through the set feeding pipe, when the wet lithium iron phosphate material flows into the feeding chamber, under the drive of the auger rod, the wet lithium iron phosphate material is gradually compacted in the feeding chamber. The water squeezed out during the compaction of the wet material flows into the auger rod through the filter screen in the filter hole on the auger rod and is discharged outward, realizing the initial drainage of the wet lithium iron phosphate material during the feeding process to the drying tank, and accelerating the efficiency of subsequent drying of lithium iron phosphate. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in this 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 for this invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a partial cross-sectional structural schematic diagram of an embodiment of the present invention;

[0024] Figure 2 This is a schematic diagram of the main structure of an embodiment of the present invention;

[0025] Figure 3 This is a schematic cross-sectional view of the main view portion of an embodiment of the present invention;

[0026] Figure 4 This is a cross-sectional view of the feeding pipe according to an embodiment of the present invention;

[0027] Figure 5 This is a schematic diagram of the auger rod structure according to an embodiment of the present invention;

[0028] Figure 6 This is a schematic diagram of the compaction mechanism structure according to an embodiment of the present invention.

[0029] The diagram is marked as follows:

[0030] 1. Drying tank; 2. Storage tank; 201. Feed pipe; 3. Feeding section; 301. Feeding pipe; 302. Baffle plate; 303. Feed hole; 304. Drain hole; 305. Drive motor; 4. Screw rod; 401. Screw blade; 402. Filter hole; 403. Water outlet; 5. Liquid storage tank; 6. Conveying pipe; 601. Solenoid valve; 7. Drain pipe; 8. Stirring rod; 801. Pressure roller; 9. Sealing plate; 10. Connecting assembly; 1001. Fixing ring; 1002. Spring; 1003. Sliding ring; 1004. Connecting rod; 1005. Push ring; 11. Servo motor. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments.

[0032] It should be noted that, unless otherwise defined, the technical or scientific terms used in this invention should have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0033] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 As shown, a drying apparatus for preparing lithium iron phosphate includes a drying tank 1. A heating jacket is provided inside the tank wall of the drying tank 1 for heating the contents of the drying tank 1. A flattening mechanism is provided inside the drying tank 1, including:

[0034] Storage tank 2 is located on top of drying tank 1, and a feed pipe 201 is provided on the top of storage tank 2; feeding part 3 is located on the outer periphery of drying tank 1 and is used to transport the wet lithium iron phosphate material in storage tank 2 into storage tank 2.

[0035] The feeding section 3 includes a feeding pipe 301, which is inclinedly arranged on the outer periphery of the drying tank 1. The end of the feeding pipe 301 away from the drying tank 1 is the low end, and the end closer to the drying tank 1 is the high end. A partition 302 is provided inside the feeding pipe 301, which divides the feeding pipe 301 into a feeding chamber on one side closer to the drying tank 1 and a drainage chamber on the other side. The inner cavity of the feeding chamber is tapered, with the end closer to the partition 302 being the thick end and the end away from the partition 302 being the narrow end, which serves as the discharge end and communicates with the drying tank 1. A hollow auger rod 4 is provided inside the feeding chamber, which passes through the partition 302 and is rotatably connected to the partition 302. A drive motor 305 is provided at the end of the feeding pipe 301 to drive the auger rod 4 to rotate. The rotation of the auger rod 4 transports the wet material from the thick section to the narrow end and compresses the wet material, so that the wet material forms a high-density plug at the discharge end.

[0036] The feeding pipe 301 is provided with a feeding hole 303, which is connected to the feeding chamber and close to the partition 302. The feeding hole 303 is connected to a conveying pipe 6, and the other end of the conveying pipe 6 is connected to the storage box 2. The feeding pipe 301 is also provided with a drain hole 304, which is connected to the drain chamber.

[0037] The auger rod 4 is adapted to the inner wall of the feeding chamber in a tapered manner. The auger rod 4 is provided with auger blades 401, which are adapted to the inner diameter of the feeding chamber. Filter holes 402 are sequentially opened between adjacent auger blades 401 on the auger rod 4. A water filter screen is installed in the filter holes 402. A water outlet hole 403 is opened on the outer periphery of the auger rod 4 located in the drainage chamber.

[0038] A sealing plate 9 is slidably connected to the inner wall of the drying tank 1 to seal the discharge end of the feeding pipe 301. A connecting assembly 10 is provided inside the drying tank 1 to drive the sealing plate 9 to move and release the seal on the discharge end.

[0039] In this embodiment, the worker places the wet lithium iron phosphate material in the storage box 2. The wet material is fed into the drying tank 1 through the feeding part 3 for heating and drying. The flattening mechanism flattens the wet material evenly on the bottom of the inner wall of the drying tank 1, increasing the contact area between the wet material and the air and accelerating the drying efficiency.

[0040] Specifically, the wet material in the storage bin 2 first flows into the conveying chamber in the feeding pipe 301 through the conveying pipe 6. When the wet material flows into the conveying chamber, the drive motor 305 drives the auger rod 4 to rotate. The auger rod 4 drives the auger blade 401 to rotate, conveying the wet material from the coarse end to the narrow end of the conveying chamber. At the same time, it moves from the low to the high. During this process, because the sealing plate 9 seals the discharge end of the feeding pipe 301, the wet material is gradually compacted in the feeding chamber and forms a high-density plug at the discharge end of the feeding pipe 301.

[0041] During the compaction process, the water squeezed out by the wet material flows into the auger rod 4 through the filter screen in the filter hole 402 on the auger rod 4. Under the influence of gravity, the squeezed water will move down along the auger rod 4 and flow into the drainage chamber in the feed pipe 301 through the outlet. Finally, it will be discharged outward through the drainage hole 304 on the drainage chamber, thereby realizing the initial drainage of the wet lithium iron phosphate material and accelerating the efficiency of subsequent drying of lithium iron phosphate.

[0042] The sealing plate 9 is moved by the connecting component 10 to release the seal on the discharge end. At this time, under the drive of the auger rod 4, the lithium iron phosphate compacted into a plug is continuously transported into the drying tank 1. Then, the connecting component 10 is controlled to reset the sealing plate 9. During the reset process, the sealing plate 9 can cut the lithium iron phosphate compacted into a plug, forming a complete set of moving actions of the sealing plate 9. The cut lithium iron phosphate falls to the bottom of the inner cavity of the drying tank 1. The flattening mechanism is controlled to flatten the lithium iron phosphate and then dry it.

[0043] In addition, the control connection component 10 drives the sealing plate 9 to move at intervals within a certain time interval, which enables lithium iron phosphate to be fed into the drying tank 1 at intervals. The flattening mechanism can flatten the lithium iron phosphate layer by layer at the bottom of the inner cavity of the drying tank 1, and each layer can fully contact the hot air in the drying tank 1, which improves the drying efficiency of lithium iron phosphate.

[0044] Preferably, there are at least two sets of feeding sections 3, which are equidistantly arranged on the outer periphery of the drying tank 1. Multiple sets of feeding sections 3 can uniformly deliver lithium iron phosphate to the bottom of the inner cavity of the drying tank 1, so that the lithium iron phosphate can be evenly distributed at the bottom of the inner cavity of the drying tank 1, avoiding the phenomenon that the flattening mechanism cannot flatten the lithium iron phosphate evenly due to the accumulation of lithium iron phosphate on one side.

[0045] Preferably, the liquid storage tank 5 is located on the outer periphery of the drying tank 1, and a drain outlet is provided at the bottom of the liquid storage tank 5;

[0046] A drain pipe 7 is connected to the drain hole 304, and the other end of the drain pipe 7 is connected to the storage tank 5.

[0047] The water squeezed out of the feed pipe 301 will move down along the auger rod 4 and flow into the drain chamber in the feed pipe 301 through the outlet. Then it will be discharged into the drain pipe 7 through the drain hole 304 on the drain chamber and finally sent into the storage tank 5 for collection through the drain pipe 7.

[0048] Preferably, the flattening mechanism includes a stirring rod 8, which is disposed inside the drying tank 1. A driving assembly for driving the stirring rod 8 to rotate is disposed inside the drying tank 1. At least one set of pressure rollers 801 is rotatably connected to the outer periphery of the bottom of the stirring rod 8. The driving assembly drives the stirring rod 8 to rotate, and the stirring rod 8 drives the pressure rollers 801 to move and flatten the lithium iron phosphate at the bottom of the inner cavity of the drying tank 1.

[0049] The drive assembly includes a horizontal plate, which is set inside the drying tank 1 to divide the drying tank 1 into a drying chamber and an equipment chamber. The top of the equipment chamber is provided with heat dissipation holes. A servo motor 11 is set inside the equipment chamber. The output rod of the servo motor 11 passes downward through the horizontal plate and is rotatably connected to the horizontal plate through a sealed bearing. The bottom end of the output rod is fixedly connected to the top end of the stirring rod 8.

[0050] The servo motor 11 is started to drive the output rod to rotate, the output rod drives the stirring rod 8 to rotate, the stirring rod 8 drives the pressure roller 801 to revolve around the stirring rod 8 as the center, and the rotating pressure roller 801 can flatten the lithium iron phosphate at the bottom of the inner cavity of the drying tank 1.

[0051] Preferably, the stirring rod 8 is an electric telescopic rod, used to drive the pressure roller 801 to move down to the working surface;

[0052] The connecting assembly 10 includes a fixed ring 1001, which is rotatably sleeved on the fixed rod of the electric telescopic rod. A spring 1002 is connected to the bottom surface of the fixed ring 1001, and a sliding ring 1003 is connected to the bottom end of the spring 1002. The sliding ring 1003 can slide up and down on the outer periphery of the electric telescopic rod. A push ring 1005 is sleeved on the movable rod of the electric telescopic rod. The push ring 1005 is located at the bottom of the sliding ring 1003 and the diameter of the push ring 1005 is larger than the inner diameter of the sliding ring 1003. At least one set of connecting rods 1004 is fixedly connected to the outer periphery of the sliding ring 1003. The other end of the connecting rod 1004 is fixedly connected to the inner periphery of the sealing plate 9.

[0053] Under the influence of gravity and the elasticity of the spring 1002, the sliding ring 1003 will drive the sealing plate 9 through the connecting rod 1004 to seal the discharge end of the feeding pipe 301. When the electric telescopic rod drives the pressure roller 801 to move upward and reset, the push ring 1005 on the electric telescopic rod will push the sliding ring 1003 to move upward. At this time, the spring 1002 deforms and stores energy. The sliding ring 1003 drives the sealing plate 9 to move upward through the connecting rod 1004 to release the seal on the discharge end. Afterward, when the electric telescopic rod drives the pressure roller 801 to move downward and flatten the lithium iron phosphate, the energy stored in the spring 1002 is released and drives the sliding plate to move downward. The sliding ring 1003 drives the sealing plate 9 to move downward to cut off the lithium iron phosphate that has been compacted into a plug and seal the discharge end.

[0054] Preferably, the bottom of the sealing ring is shaped like a ring blade; this improves the effect of the sealing ring on cutting off the lithium iron phosphate that has been compacted into a plug.

[0055] Preferably, a solenoid valve 601 is provided on the conveying pipe 6; when the amount of wet lithium iron phosphate material in the storage tank 2 is not large, the solenoid valve 601 can control part of the conveying pipe 6 to be closed, so that the wet material is concentrated and conveyed to another part of the conveying pipe 6 and the feeding pipe 301 connected thereto, so as to maintain the effect of compacting the wet material in the conveying pipe 6.

[0056] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the invention (including the claims) is limited to these examples; within the framework of the invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in the details for the sake of brevity.

[0057] This invention is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A drying apparatus for preparing lithium iron phosphate, comprising a drying tank (1), wherein a flattening mechanism is provided inside the drying tank (1), characterized in that, include: Storage box (2) is set on top of drying tank (1); feeding part (3) is set on the outer periphery of drying tank (1) for conveying the wet lithium iron phosphate material in storage box (2) to drying tank (1); The feeding section (3) includes a feeding pipe (301), which is inclinedly arranged on the outer periphery of the drying tank (1). The end of the feeding pipe (301) away from the drying tank (1) is the low end, and the end closer to the drying tank (1) is the high end. A partition (302) is provided inside the feeding pipe (301). The partition (302) divides the feeding pipe (301) into a feeding chamber on the side closer to the drying tank (1) and a drainage chamber on the other side. The inner cavity of the feeding chamber is gradually narrowing. One end of the 02) is a thick end, and the end away from the partition (302) is a narrow end, which serves as the discharge end and is connected to the drying tank (1). A hollow auger rod (4) is provided in the feeding chamber. The auger rod (4) passes through the partition (302) and is rotatably connected to the partition (302). The end of the feeding pipe (301) is provided with a drive motor (305) for driving the auger rod (4) to rotate. The rotation of the auger rod (4) transports the wet material from the thick end to the narrow end and compresses the wet material, so that the wet material forms a high-density plug at the discharge end. The feeding pipe (301) is provided with a feeding hole (303), which is connected to the feeding chamber and close to the partition (302). The feeding hole (303) is connected to a conveying pipe (6), and the other end of the conveying pipe (6) is connected to the storage box (2). The feeding pipe (301) is also provided with a drain hole (304), which is connected to the drain chamber. The auger rod (4) is adapted to the inner wall of the feeding chamber in a tapered manner. The auger rod (4) is provided with auger blades (401). A filter hole (402) is opened on the auger rod (4). A water filter screen is provided in the filter hole (402). A water outlet hole (403) is opened on the outer periphery of the auger rod (4) located in the drainage chamber. A sealing plate (9) is slidably connected to the inner wall of the drying tank (1) to seal the discharge end of the feeding pipe (301). A connecting component (10) is provided inside the drying tank (1) to drive the sealing plate (9) to move and release the seal on the discharge end. The flattening mechanism includes a stirring rod (8), which is disposed inside the drying tank (1). A driving assembly for driving the stirring rod (8) to rotate is disposed inside the drying tank (1). At least one set of pressure rollers (801) is rotatably connected to the outer periphery of the bottom of the stirring rod (8). The driving assembly drives the stirring rod (8) to rotate, and the stirring rod (8) drives the pressure rollers (801) to move and flatten the lithium iron phosphate at the bottom of the inner cavity of the drying tank (1). The stirring rod (8) is an electric telescopic rod used to drive the pressure roller (801) to move down to the working surface; The connecting assembly (10) includes a fixed ring (1001), which is rotatably sleeved on the fixed rod of the electric telescopic rod. A spring (1002) is connected to the bottom surface of the fixed ring (1001), and a sliding ring (1003) is connected to the bottom end of the spring (1002). The sliding ring (1003) can slide up and down on the outer periphery of the electric telescopic rod. A push ring (1005) is sleeved on the movable rod of the electric telescopic rod. The push ring (1005) is located at the bottom of the sliding ring (1003), and the diameter of the push ring (1005) is larger than the inner diameter of the sliding ring (1003). At least one set of connecting rods (1004) is fixedly connected to the outer periphery of the sliding ring (1003), and the other end of the connecting rod (1004) is fixedly connected to the inner periphery of the sealing plate (9).

2. The drying apparatus for preparing lithium iron phosphate according to claim 1, characterized in that, There are at least two sets of feeding sections (3), which are equidistantly arranged on the outer periphery of the drying tank (1).

3. The drying apparatus for preparing lithium iron phosphate according to claim 2, characterized in that, It also includes a liquid storage tank (5), which is located on the outer periphery of the drying tank (1).

4. The drying apparatus for preparing lithium iron phosphate according to claim 3, characterized in that, The drain hole (304) is connected to a drain pipe (7), and the other end of the drain pipe (7) is connected to the storage tank (5).

5. The drying apparatus for preparing lithium iron phosphate according to claim 1, characterized in that, The drive assembly includes a horizontal plate, which is set inside the drying tank (1) to divide the drying tank (1) into a drying chamber and an equipment chamber. A servo motor (11) is set inside the equipment chamber. The output rod of the servo motor (11) passes through the horizontal plate and is rotatably connected to the horizontal plate through a sealed bearing. The bottom end of the output rod is fixedly connected to the top end of the stirring rod (8).

6. The drying apparatus for preparing lithium iron phosphate according to claim 1, characterized in that, The bottom of the sealed plate (9) is shaped like a ring blade.

7. The drying apparatus for preparing lithium iron phosphate according to claim 2, characterized in that, A solenoid valve (601) is installed on the conveying pipe (6).

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