Drying device for preparing lithium iron phosphate

Abstract

The invention relates to the technical field of lithium iron phosphate preparation, in particular to a drying device for lithium iron phosphate preparation, which comprises a drying tank body and a material storage box, a flattening mechanism is arranged in the drying tank body, and the material storage box is arranged at the top of the drying tank body; the feeding part is arranged on the periphery of the drying tank body and is used for conveying the lithium iron phosphate wet material in the storage box into the storage box; the feeding part comprises a feeding pipe, and the feeding pipe is obliquely arranged on the periphery of the drying tank body. Through the arrangement of the conveying pipe, when a lithium iron phosphate wet material flows into the conveying cavity, the lithium iron phosphate wet material is gradually compacted in the conveying cavity under the driving of the auger rod, and water extruded from the compacted wet material flows into the auger rod through a water filter screen in a filter hole in the auger rod and is discharged outwards; the wet lithium iron phosphate material is preliminarily drained in the process of conveying the wet lithium iron phosphate material to the drying tank body, and the subsequent drying efficiency of the lithium iron phosphate is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium iron phosphate preparation, and in particular to a drying device for lithium iron phosphate preparation. Background Art

[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 electric vehicle power batteries. When preparing lithium iron phosphate, iron phosphate and lithium carbonate need to be mixed in a certain proportion to form a wet material, and the prepared wet material needs to be dried later.

[0003] The patent with application number CN202220087215.1 discloses a lithium iron phosphate drying device, including a main body, a feed port is arranged at the top of the main body; a hot air drying system, the hot air drying system is installed on one side of the inner wall of the main body; and a side inclined heating system is installed on the inner wall of the main body and is located at the lower side of the hot air drying system.

[0004] When the above patent is in use, since the wet lithium iron phosphate material contains a large amount of water, it takes a long drying time for workers to directly input the wet lithium iron phosphate material into the main body for drying, resulting in poor drying efficiency of the drying device for the lithium iron phosphate and failure to perform a pre-draining step for the wet lithium iron phosphate material transported to the drying main body. Summary of the invention

[0005] In view of this, the purpose of the present invention is to provide a drying device for preparing lithium iron phosphate to solve the problem of poor drying efficiency of the existing drying devices for preparing lithium iron phosphate.

[0006] Based on the above purpose, the present invention provides a drying device for preparing lithium iron phosphate, including a drying tank body, in which a flattening mechanism is arranged, including:

[0007] The material storage box is arranged on the top of the drying tank body; the material feeding part is arranged on the periphery of the drying tank body and is used to transport the wet lithium iron phosphate material in the material storage box to the material storage box;

[0008] The feeding part includes a feeding pipe, which is obliquely arranged on the outer periphery of the drying tank body, the end of the feeding pipe away from the drying tank body is the low end, and the end close to the drying tank body is the high end. A partition is arranged in the feeding pipe, and the partition divides the feeding pipe into a feeding cavity close to one side of the drying tank body and a drainage cavity on the other side. The inner cavity of the feeding cavity is tapered, and the end close to the partition is the thick end, and the end away from the partition is the narrow end and is connected with the drying tank body as a discharge end. A hollow auger rod is arranged in the feeding cavity, and the auger rod passes through the partition and is rotatably connected to the partition. A driving motor for driving the auger rod to rotate is arranged at the end of the feeding pipe; the auger rod rotates to transport the wet material from the thick section to the narrow end and compress the wet material, so that the wet material forms a high-density plug at the discharge end;

[0009] The feed pipe is provided with a feed hole, which is connected to the feed cavity and close to the partition plate. The feed hole is connected to a delivery pipe, and the other end of the delivery pipe is connected to the storage box. The feed pipe is also provided with a drainage hole, which is connected to the drainage cavity.

[0010] The auger rod is adapted to the inner wall of the feeding cavity in a tapered manner, an auger blade is arranged on the auger rod, a filter hole is opened on the auger rod, a water filter net is arranged in the filter hole, and a water outlet hole is opened on the outer periphery of the auger rod located in the drainage cavity;

[0011] The sealing plate is slidably connected and arranged on the inner wall of the drying tank body to seal the discharge end of the feeding pipe. The drying tank body is provided with a connecting component for driving the sealing plate to move to release the sealing of the discharge end.

[0012] Furthermore, there are at least two groups of feeding parts, and the feeding parts are arranged at equal distances on the periphery of the drying tank body.

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

[0014] Furthermore, the drainage hole is connected with a drainage pipe, and the other end of the drainage pipe is connected with the liquid storage tank.

[0015] Furthermore, the flattening mechanism includes a stirring rod, which is arranged in a drying tank body. A driving assembly for driving the stirring rod to rotate is arranged in the drying tank body, and at least one group of pressure rollers are rotatably connected to the outer periphery of the bottom of the stirring rod; the driving assembly drives the stirring rod to rotate, and the stirring rod drives the pressure rollers to move to flatten the lithium iron phosphate at the bottom of the inner cavity of the drying tank body.

[0016] Furthermore, the driving assembly includes a transverse plate, which is arranged in the drying tank body to divide the drying tank body into a drying chamber and an equipment chamber. A servo motor is arranged in the equipment chamber. The output rod of the servo motor passes downward through the transverse plate and is rotatably connected to the transverse 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 electric telescopic rod, which is 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 mounted on the fixed rod of the electric telescopic rod, the bottom surface of the fixed ring is connected to a spring, the bottom end of the spring is connected to a sliding ring, and the sliding ring can slide up and down on the outer periphery of the electric telescopic rod. A push ring is mounted on the movable rod of the electric telescopic rod, the push ring is arranged at the bottom of the sliding ring and the diameter of the push ring is larger than the inner diameter of the sliding ring, and at least one group 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 sealed plate.

[0019] Furthermore, the bottom of the closed ring is in a ring knife shape.

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

[0021] Beneficial effects of the present invention: As can be seen from the above description, a drying device for preparing lithium iron phosphate provided by the present invention, through the provided feed pipe, when the lithium iron phosphate wet material flows into the feed cavity, the lithium iron phosphate wet material is gradually compacted in the feed cavity under the drive of the auger rod, and the moisture squeezed out during the compaction of the wet material flows into the auger rod through the water filter net in the filter holes on the auger rod and is discharged outward, thereby achieving preliminary drainage of the lithium iron phosphate wet material in the process of feeding the lithium iron phosphate into the drying tank body, thereby accelerating the efficiency of subsequent drying of the lithium iron phosphate. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only for the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

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

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

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

[0026] Figure 4 This is a schematic cross-sectional structural diagram of the feeding tube according to an embodiment of the present invention;

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

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

[0029] The markings in the figure are:

[0030] 1. Drying tank; 2. Storage box; 201. Feed pipe; 3. Feeding part; 301. Feeding pipe; 302. Partition; 303. Feed hole; 304. Drain hole; 305. Driving motor; 4. Auger rod; 401. Auger blade; 402. Filter hole; 403. Water outlet; 5. Liquid storage tank; 6. Feed pipe; 601. Solenoid valve; 7. Drain pipe; 8. Stirring rod; 801. Pressing roller; 9. Sealing plate; 10. Connecting assembly; 1001. Fixed ring; 1002. Spring; 1003. Sliding ring; 1004. Connecting rod; 1005. Push ring; 11. Servo motor. DETAILED DESCRIPTION

[0031] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments.

[0032] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used 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 device for preparing lithium iron phosphate includes a drying tank body 1, a heating interlayer is arranged in the tank wall of the drying tank body 1, and the heating interlayer is used to heat the drying tank body 1. A flattening mechanism is arranged in the drying tank body 1, including:

[0034] The material storage box 2 is arranged on the top of the drying tank body 1, and a feeding pipe 201 is opened on the top of the material storage box 2; the feeding part 3 is arranged on the outer periphery of the drying tank body 1, and is used to transport the lithium iron phosphate wet material in the material storage box 2 into the material storage box 2;

[0035] The feeding part 3 includes a feeding pipe 301, which is obliquely arranged on the outer periphery of the drying tank body 1, the end of the feeding pipe 301 away from the drying tank body 1 is the low end, and the end close to the drying tank body 1 is the high end. A partition 302 is arranged in the feeding pipe 301, and the partition 302 divides the feeding pipe 301 into a feeding cavity close to one side of the drying tank body 1 and a drainage cavity on the other side. The inner cavity of the feeding cavity is gradually contracted, and the end close to the partition 302 is the thick end, and the end away from the partition 302 is the narrow end and is connected with the drying tank body 1 as a discharge end. A hollow auger rod 4 is arranged in the feeding cavity, and the auger rod 4 passes through the partition 302 and is rotatably connected to the partition 302. A driving motor 305 for driving the auger rod 4 to rotate is arranged at the end of the feeding pipe 301; the auger rod 4 rotates to transport the wet material from the thick section to the narrow end and compress the wet material, so that the wet material forms a high-density plug at the discharge end;

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

[0037] The auger rod 4 is adapted to the inner wall of the feeding cavity in a tapered manner, and an auger blade 401 is provided on the auger rod 4, and the auger blade 401 is adapted to the inner diameter of the feeding cavity, and filter holes 402 are sequentially opened between adjacent auger blades 401 on the auger rod 4, and a water filter net is arranged in the filter hole 402, and a water outlet hole 403 is opened on the outer periphery of the auger rod 4 located in the drainage cavity;

[0038] The sealing plate 9 is slidably connected to the inner wall of the drying tank body 1 to seal the discharge end of the feeding pipe 301. The drying tank body 1 is provided with a connecting component 10 for driving the sealing plate 9 to move to release the sealing of the discharge end.

[0039] In this embodiment, workers place lithium iron phosphate wet materials in the storage box 2, and the wet materials are fed into the drying tank body 1 through the feeding part 3 for heating and drying. The flattening mechanism evenly flattens the wet materials at the bottom of the inner wall of the drying tank body 1, thereby increasing the contact area between the wet materials and the air and accelerating the drying efficiency.

[0040] Specifically, the wet material in the storage box 2 first flows into the feeding cavity in the feeding pipe 301 through the feeding pipe 6. When the wet material flows into the feeding cavity, the driving motor 305 drives the auger rod 4 to rotate, and the auger rod 4 drives the auger blade 401 to rotate to transport the wet material from the thick end of the feeding cavity to the narrow end, and also moves from a low place to a high place. In this process, since the sealing plate 9 seals the discharge end of the feeding pipe 301, the wet material is gradually compacted in the feeding cavity and forms a high-density plug at the discharge end of the feeding pipe 301.

[0041] The water squeezed out of the wet material during the compaction process flows into the auger rod 4 through the water filter net in the filter hole 402 on the auger rod 4. Under the influence of gravity, the squeezed water moves down along the auger rod 4 and flows into the drainage cavity in the feed pipe 301 through the water outlet, and finally is discharged outward through the drainage hole 304 opened on the drainage cavity, thereby achieving the initial drainage of the lithium iron phosphate wet material and accelerating the efficiency of the subsequent drying of the lithium iron phosphate.

[0042] The sealing plate 9 is driven to move by the connection component 10 to release the sealing of the discharge end. At this time, the lithium iron phosphate compacted into a plug is continuously transported to the drying tank body 1 under the drive of the auger rod 4. Then, the connection component 10 is controlled again to drive the sealing plate 9 to reset. The sealing plate 9 can cut off the lithium iron phosphate compacted into a plug during the reset process, forming a complete moving action group of the sealing plate 9; the cut lithium iron phosphate falls to the bottom of the inner cavity of the drying tank body 1, and the flattening mechanism is controlled to flatten the lithium iron phosphate and then dry the lithium iron phosphate;

[0043] In addition, the control connection component 10 drives the sealed plate 9 to move the action group at intervals at a certain time interval, so that the lithium iron phosphate can be fed into the drying tank body 1 at intervals, and the flattening mechanism can flatten the lithium iron phosphate layer by layer at the bottom of the inner cavity of the drying tank body 1, and each layer can fully contact with the hot air in the drying tank body 1, thereby improving the efficiency of drying the lithium iron phosphate.

[0044] Preferably, there are at least two groups of feeding parts 3, and the feeding parts 3 are equidistantly arranged on the outer periphery of the drying tank body 1; multiple groups of feeding parts 3 can evenly transport lithium iron phosphate to the bottom of the inner cavity of the drying tank body 1, so that the lithium iron phosphate can be evenly distributed at the bottom of the inner cavity of the drying tank body 1, avoiding the phenomenon that the flattening mechanism cannot evenly flatten the lithium iron phosphate due to the accumulation of lithium iron phosphate on one side.

[0045] Preferably, the liquid storage tank 5 is arranged on the outer periphery of the drying tank body 1, and a drain port is arranged at the bottom of the liquid storage tank 5;

[0046] The drainage hole 304 is connected with a drainage pipe 7, and the other end of the drainage pipe 7 is connected with the liquid storage tank 5;

[0047] The water squeezed out in the feed pipe 301 will move down along the auger rod 4 and flow into the drainage cavity in the feed pipe 301 through the water outlet, and then be discharged to the drainage pipe 7 through the drainage hole 304 opened on the drainage cavity, and finally be sent to the liquid storage tank 5 through the drainage pipe 7 for collection.

[0048] Preferably, the flattening mechanism comprises a stirring rod 8, which is arranged in the drying tank body 1, and a driving assembly for driving the stirring rod 8 to rotate is arranged in the drying tank body 1, and at least one group of pressing rollers 801 are 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 pressing rollers 801 to move to flatten the lithium iron phosphate at the bottom of the inner cavity of the drying tank body 1;

[0049] The driving assembly includes a horizontal plate, which is arranged in the drying tank body 1 to divide the drying tank body 1 into a drying chamber and an equipment chamber. A heat dissipation hole is opened on the top of the equipment chamber. A servo motor 11 is arranged in the equipment chamber. The output rod of the servo motor 11 passes through the horizontal plate downward 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, and the stirring rod 8 drives the pressing roller 801 to revolve around the stirring rod 8 as the center. The rotating pressing 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, which is 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. The bottom surface of the fixed ring 1001 is connected to a spring 1002, and the bottom end of the spring 1002 is connected to a sliding ring 1003. 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 arranged at the bottom of the sliding ring 1003 and the diameter of the push ring 1005 is greater than the inner diameter of the sliding ring 1003. At least one group of connecting rods 1004 are 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.

[0053] Under the action 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 tube 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, and 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. Afterwards, 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 to drive the sliding plate to move downward, and the sliding ring 1003 drives the sealing plate 9 to move downward to cut off the lithium iron phosphate compacted into a plug and seal the discharge end.

[0054] Preferably, the bottom of the sealed ring is in the shape of a ring knife, which improves the effect of the sealed ring on cutting off the lithium iron phosphate compacted into the plug body.

[0055] Preferably, a solenoid valve 601 is provided on the feed pipe 6; when the amount of wet lithium iron phosphate material in the storage box 2 is small, the solenoid valve 601 can be used to control part of the feed pipe 6 to be closed, so that the wet material is concentrated and fed to another part of the feed pipe 6 and the feeding pipe 301 connected thereto, thereby maintaining the effect of compacting the wet material in the feed pipe 6.

[0056] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples. Under the concept of the present invention, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity.

[0057] The present 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 the present invention should be included in the scope of protection of the present invention.

Claims

1. A drying device for preparing lithium iron phosphate, comprising a drying tank (1), wherein a flattening mechanism is arranged in the drying tank (1), characterized in that: include: A material storage box (2) is arranged on the top of the drying tank body (1); a material feeding portion (3) is arranged on the outer periphery of the drying tank body (1) and is used to transport the lithium iron phosphate wet material in the material storage box (2) into the material storage box (2); The feeding portion (3) comprises a feeding pipe (301), the feeding pipe (301) being arranged obliquely on the outer periphery of the drying tank body (1), the end of the feeding pipe (301) being away from the drying tank body (1) being the lower end, and the end of the feeding pipe (301) being close to the drying tank body (1) being the higher end, a partition (302) being arranged inside the feeding pipe (301), the partition (302) dividing the feeding pipe (301) into a feeding cavity on one side close to the drying tank body (1) and a drainage cavity on the other side, the inner cavity of the feeding cavity being gradually contracted, and the cavity close to the partition (302) is provided with a drainage cavity on the other side. 02) is a thick end, and the end away from the partition (302) is a narrow end and is connected to the drying tank body (1) as a discharge end. A hollow auger rod (4) is arranged in the feeding cavity. The auger rod (4) passes through the partition (302) and is rotatably connected to the partition (302). A driving motor (305) for driving the auger rod (4) to rotate is arranged at the end of the feeding pipe (301); the auger rod (4) rotates to transport the wet material from the thick section to the narrow end and compress the wet material, so that the wet material forms a high-density plug at the discharge end; The feed pipe (301) is provided with a feed hole (303), the feed hole (303) is connected to the feed cavity and is close to the partition (302), the feed hole (303) is connected to a delivery pipe (6), the other end of the delivery pipe (6) is connected to the storage box (2), and the feed pipe (301) is also provided with a drainage hole (304), the drainage hole (304) is connected to the drainage cavity; The auger rod (4) is adapted to the inner wall of the feeding cavity in a tapered manner, an auger blade (401) is arranged on the auger rod (4), a filter hole (402) is opened on the auger rod (4), a water filter net is arranged in the filter hole (402), and a water outlet hole (403) is opened on the outer periphery of the auger rod (4) located in the drainage cavity; A sealing plate (9) is slidably connected and arranged on the inner wall of the drying tank body (1) to seal the discharge end of the feeding pipe (301). A connecting component (10) is arranged in the drying tank body (1) to drive the sealing plate (9) to move so as to release the sealing of the discharge end.

2. The drying device for preparing lithium iron phosphate according to claim 1, characterized in that: There are at least two groups of feeding parts (3), and the feeding parts (3) are arranged at equal distances on the outer periphery of the drying tank body (1).

3. The drying device for preparing lithium iron phosphate according to claim 2, characterized in that: It also comprises a liquid storage tank (5), wherein the liquid storage tank (5) is arranged on the outer periphery of the drying tank body (1).

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

5. The drying device for preparing lithium iron phosphate according to claim 1, characterized in that: The flattening mechanism comprises a stirring rod (8), the stirring rod (8) being arranged in a drying tank body (1), a driving assembly for driving the stirring rod (8) to rotate being arranged in the drying tank body (1), at least one group of pressing rollers (801) being 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 pressing rollers (801) to move to flatten the lithium iron phosphate at the bottom of the inner cavity of the drying tank body (1).

6. The drying device for preparing lithium iron phosphate according to claim 5, characterized in that: The driving assembly comprises a transverse plate, which is arranged in the drying tank body (1) to divide the drying tank body (1) into a drying chamber and an equipment chamber. A servo motor (11) is arranged in the equipment chamber. An output rod of the servo motor (11) passes through the transverse plate downward and is rotatably connected to the transverse plate via a sealed bearing. The bottom end of the output rod is fixedly connected to the top end of the stirring rod (8).

7. The drying device for preparing lithium iron phosphate according to claim 5, characterized in that: The stirring rod (8) is an electric telescopic rod, which is used to drive the pressure roller (801) to move downward to the working surface.

8. The drying device for preparing lithium iron phosphate according to claim 7, characterized in that: The connection assembly (10) comprises a fixed ring (1001), the fixed ring (1001) is rotatably sleeved on the fixed rod of the electric telescopic rod, the bottom surface of the fixed ring (1001) is connected to a spring (1002), the bottom end of the spring (1002) is connected to a sliding ring (1003), 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 arranged 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 group 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).

9. The drying device for preparing lithium iron phosphate according to claim 1, characterized in that: The bottom of the closed ring is in the shape of a ring knife.

10. The drying device for preparing lithium iron phosphate according to claim 2, characterized in that: The material conveying pipe (6) is provided with a solenoid valve (601).

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