Lithium iron phosphate grinding and sieving device

Abstract

The utility model discloses a lithium iron phosphate grinding and sieving device which comprises a feeding part, a grinding part, a sieving part, a discharging part and a supporting base, the sieving part comprises an outer shell and two sieving plates with sieve holes different in size, the two sieving plates are rotatably arranged in the outer shell, a hollow plate is fixedly arranged above the two sieving plates, and the hollow plate is fixedly arranged on the outer shell. The hollowed-out plate and the two sieving plates are each provided with a plurality of hollowed-out parts, a double-end motor is further arranged between the two sieving plates in a vertically-lifting mode, a driving device is arranged, the upper rotating shaft end and the lower rotating shaft end of the double-end motor are fixedly sleeved with outer gears, and inner gears meshed with the outer gears are arranged in the middles of the two sieving plates. When the screening device is used, the driving device lifts the outer gear to drive the screening plate to rotate until the position of the screening hole part is aligned with the position of the hollowed-out part of the hollowed-out plate, when the screening plate needs to be replaced, the current screening plate is rotated to an initial state, and then the other screening plate is rotated to play a screening role, so that the screening plate can be replaced without shutdown and manual disassembly; the working efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium iron phosphate production equipment, in particular to a lithium iron phosphate grinding and screening device. Background Art

[0002] Lithium iron phosphate is a compound commonly used as anode material for lithium-ion batteries. It is widely used due to its high safety, long cycle life, non-toxicity and environmental protection. In the production process of lithium iron phosphate, grinding and screening is an important process to ensure that the particle size distribution of lithium iron phosphate powder is uniform, thereby improving the performance of the battery.

[0003] During the screening process, sieves with different mesh sizes are needed to screen the lithium iron phosphate powder. However, when replacing the sieve, the existing lithium iron phosphate screening device needs to shut down the device and then manually disassemble and replace the sieve, which is time-consuming and labor-intensive. Utility Model Content

[0004] The purpose of the utility model is to provide a lithium iron phosphate grinding and screening device in order to solve the above-mentioned problems.

[0005] The technical solution of the utility model is achieved in this way:

[0006] The utility model provides a lithium iron phosphate grinding and screening device, comprising a feeding part, a grinding part, a screening part, a discharging part and a supporting base, the screening part comprising an outer shell and two screening plates with different screen holes, the two screening plates are rotatably arranged in the outer shell, and a hollow plate is fixedly arranged above the two screening plates, the hollow plate and the two screening plates are both provided with a plurality of hollow parts for lithium iron phosphate powder to pass through, the hollow parts are evenly distributed in an annular shape, a double-headed motor is arranged between the two screening plates so as to be able to rise and fall, and a driving device for raising and lowering the double-headed motor is provided, the upper and lower rotating shaft ends of the double-headed motor are both fixedly sleeved with external gears, and the middle parts of the two screening plates are both provided with internal gears meshing with the external gears.

[0007] In one embodiment, it also includes a telescopic rod, wherein one downward end of the telescopic rod is fixedly mounted on the upward rotating shaft end of the double-headed motor, and the other end extends to the hollow plate and is fixedly provided with a first cleaning member, which is rotatably abutted against the upper end surface of the hollow plate, and the screening plate located above the double-headed motor is rotatably mounted on the outside of the telescopic rod.

[0008] In one embodiment, two second cleaning members are fixedly provided in the outer shell, and the two second cleaning members are respectively in contact with the upper end surfaces of the two sieve plates.

[0009] In one embodiment, the upper end surfaces of the two sieve plates are both configured as inclined surfaces, and the height of the inclined surfaces decreases from the inner side to the outer side of the outer shell.

[0010] In one embodiment, an annular partition is rotatably provided between the hollow plate and the sieve plate and between the two sieve plates, and the annular partition surrounds the double-headed motor, the driving device and the telescopic rod.

[0011] In one embodiment, a plurality of balls are arranged between the side surface of the sieve plate and the outer shell.

[0012] The advantages or beneficial effects of the above technical solution include at least:

[0013] First, in the utility model, in the initial state, the positions of the hollow parts of the two sieve plates are aligned with the positions of the hollow parts of the hollow plates. When in use, the external gear of the driving device is lifted and lowered to engage with the internal gear of the corresponding sieve plate, and the sieve plate is rotated to the position of the sieve hole portion to align with the position of the hollow part of the hollow plate, so that the lithium iron phosphate powder passing through the hollow part of the hollow plate can be screened. When the sieve plate needs to be replaced, the current sieve plate is rotated to the initial state, and then the other sieve plate is rotated to perform the screening effect. Therefore, the sieve plate can be replaced without stopping the machine for manual disassembly, thereby improving work efficiency.

[0014] Secondly, in the utility model, a first cleaning member is provided to rotate during operation to push the lithium iron phosphate powder dropped on the hollow plate to the hollow portion to prevent the lithium iron phosphate powder from being retained on the hollow plate.

[0015] Thirdly, in the present invention, a second cleaning member is provided for cleaning the lithium iron phosphate powder on the sieve plate to improve the sieving efficiency.

[0016] Fourthly, in the present invention, an annular partition is provided to prevent the lithium iron phosphate powder from affecting the operation of the double-headed motor, the driving device and the telescopic rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings show exemplary implementations of the present invention and, together with the description thereof, are used to explain the principles of the present invention. These drawings are included to provide a further understanding of the present invention and are included in and constitute a part of this specification.

[0018] Figure 1 It is a three-dimensional structural schematic diagram of the utility model.

[0019] Figure 2 The cross-sectional structure of the screening part in the present invention is shown in FIG. Figure 1 .

[0020] Figure 3 for Figure 2 Enlarged schematic diagram of the structure of part A in the middle.

[0021] Figure 4 The cross-sectional structure of the screening part in the present invention is shown in FIG. Figure 2 .

[0022] Figure 5 It is a schematic diagram of the planar structure of the hollow plate in the utility model.

[0023] Figure 6 It is a schematic diagram of the planar structure of the sieve plate in the utility model.

[0024] Figure numerals: 1. Feeding part; 2. Grinding part; 3. Screening part; 31. Outer shell; 32. Screening plate; 4. Discharging part; 5. Support base; 6. Hollow plate; 7. Double-headed motor; 8. Driving device; 9. External gear; 10. Internal gear; 11. Telescopic rod; 12. First cleaning part; 13. Second cleaning part; 14. Annular partition; 15. Ball. DETAILED DESCRIPTION

[0025] The embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as being limited to the embodiments described herein. Instead, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the drawings and embodiments of the present invention are only for exemplary purposes and are not intended to limit the scope of protection of the present invention.

[0026] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0027] It should be understood that the term "including" and its variations used in this document are open inclusions, that is, "including but not limited to". The term "based on" means "based at least in part on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one other embodiment"; the term "some embodiments" means "at least some embodiments". The relevant definitions of other terms will be given in the description below. It should be noted that the concepts of "first", "second", etc. mentioned in the present utility model are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0028] It should be noted that the modifications of "one" and "plurality" mentioned in the present invention are illustrative rather than restrictive, and those skilled in the art should understand that, unless otherwise clearly indicated in the context, it should be understood as "one or more".

[0029] The names of the messages or information exchanged between multiple devices in the implementation manner of the present utility model are only used for illustrative purposes, and are not used to limit the scope of these messages or information.

[0030] Reference Figure 1 A lithium iron phosphate grinding and screening device includes a feed part 1, a grinding part 2, a screening part 3, a discharging part 4 and a supporting base 5, wherein the grinding part 2 is used to crush the granular lithium iron phosphate into powder, and the grinding part 2 includes but is not limited to an existing high-pressure roller mill, and the feed part 1 is the feed port of the high-pressure roller mill. The other specific structures are not repeated here. When in use, the lithium iron phosphate is injected into the grinding part through the feed part to reduce the particle size of the raw material, and the larger particles are ground into smaller particles. The ground lithium iron phosphate powder has particles of different sizes. At this time, the appropriate particles are screened through the screening part, and finally discharged from the discharging part to the collection container.

[0031] Reference Figure 1 , Figure 2 , Figure 5 , Figure 6The sieving part 3 includes an outer shell 31 and two sieving plates 32 with different sieve holes. Two sieving plates 32 are rotatably arranged in the outer shell 31. The sieving plates 32 with suitable sieve holes can be selected according to the needs. A hollow plate 6 is fixed above the two sieving plates 32. The hollow plate 6 and the two sieving plates 32 are provided with a plurality of hollow parts for lithium iron phosphate powder to pass through. The hollow parts are evenly distributed in an annular shape. A double-headed motor 7 is arranged between the two sieving plates 32 so as to be able to rise and fall, and a double-headed motor is provided to enable the double-headed motor to be moved upward and downward. The driving device 8 for the motor 7 to be lifted up and down, the upper and lower rotating shaft ends of the double-headed motor 7 are fixedly sleeved with an external gear 9, and the middle parts of the two sieve plates 32 are provided with an internal gear 10 meshing with the external gear 9. Under such a setting, the two sieve plates 32 that meet the needs are assembled in the outer shell 31 during installation. In the initial state, the hollow parts on the two sieve plates 32 correspond to the hollow parts on the hollow plate 6. The double-headed motor 7 is driven up and down by the driving device 8, so that the external gear 9 and the internal gear 10 are meshed with each other. The double-headed motor 7 drives the gear to drive the sieve plate 32 to rotate, so that the sieve hole portion on the sieve plate 32 rotates to a position corresponding to the hollow portion of the hollow plate 6. At this time, the sieve plate 32 is in a sieving state, and the ground lithium iron phosphate powder can pass through the hollow portion of the hollow plate 6 and fall into the sieve hole portion of the sieve plate 32, and then fall downward after sieving. At the same time, since the hollow portion of the other sieve plate 32 still corresponds to the position of the hollow portion of the hollow plate 6, it will not block the lithium iron phosphate powder from falling. When passing through the sieve plate 32, first rotate the currently used sieve plate 32 to the initial state, and then move the double-headed motor 7 to the other direction so that the outer gear 9 engages with the inner gear 10 of the other sieve plate 32, and then rotate this sieve plate 32 to the sieving state position, so that the lithium iron phosphate powder falling through the hollow part of the hollow plate 6 can be sieved on this sieve plate 32. Therefore, if the sieve plate 32 needs to be replaced during the use of the device, there is no need to shut down the device and manually disassemble and replace the sieve plate 32.

[0032] In a specific embodiment, an annular support seat is fixedly provided on the inner wall of the outer shell 31 , and the support seat abuts against the edge of the lower end surface of the sieve plate 32 to play the role of supporting the sieve plate 32 .

[0033] In a specific embodiment, the driving device 8 includes but is not limited to an electric push rod, the base of the electric push rod is fixed to the outer shell 31 by bolts or the like, and the piston rod is fixedly connected to the base of the double-headed motor 7.

[0034] In a specific embodiment, a driving block can be used to replace the external gear 9. The driving block is made of a material with high friction, including but not limited to silicone. The position of the internal gear 10 of the sieve plate 32 can also be covered with a material with high friction. A number of contact parts can also be set between the driving block and the sieve plate 32 to increase the friction, so that when the driving block rotates, the sieve plate 32 can be driven to rotate together through friction.

[0035] Reference Figure 2 and Figure 4 , and also includes a telescopic rod 11, which includes an upper section rod and a lower section rod that are plugged into each other, and the upper section rod and the lower section rod can only be telescopic to each other, and cannot rotate with each other. The downward end of the telescopic rod 11 (i.e., the lower end of the lower section rod) is fixed to the upward rotating shaft end of the double-headed motor 7, and the other end (i.e., the upper end of the upper section rod) extends to the upper end surface of the hollow plate 6. The sieving plate 32 located above the double-headed motor 7 is rotatably sleeved on the outer side of the telescopic rod 11. When the double-headed motor 7 drives the sieving plate 32 to rotate from the initial state to the sieving state, the driving device 8 drives the double-headed motor 7 to move so that the outer gear 9 is disengaged from the inner gear 10, and then the upward rotating shaft end of the double-headed motor 7 can continue to rotate to drive the telescopic rod 11 to rotate, and the telescopic rod 11 drives the first cleaning member 12 at the other end to rotate, so as to sweep the lithium iron phosphate powder that falls on the hollow plate 6 to the hollow part and falls downward to the sieving plate 32 for sieving.

[0036] The telescopic property of the telescopic rod 11 can ensure that the first cleaning member 12 will not be separated from the upper end surface of the hollow plate 6 when the double-headed motor 7 is raised and lowered.

[0037] Reference Figure 2 Two second cleaning members 13 are also fixedly provided in the outer shell 31, and the two second cleaning members 13 are respectively abutted against the upper end surfaces of the two sieve plates 32. When the sieve plate 32 needs to be replaced, the collecting container located at the discharge portion 4 is replaced, and the double-headed motor 7 is lifted and lowered again by the driving device 8 to make the outer gear 9 mesh with the inner gear 10 again, and then the double-headed motor 7 is operated to drive the sieve plate 32 to rotate a certain number of circles. After the rotation is completed, the sieve plate 32 is in the initial state. During the rotation, the remaining lithium iron phosphate powder on the sieve plate 32 can be swept to the hollow part by the second cleaning member 13 and fall into the collecting container for secondary processing. At the same time, some small particles buried in the large particles can pass through the sieve holes during the cleaning process. Under such a setting, not only the screening efficiency can be improved, but also the lithium iron phosphate powder can be prevented from being retained on the sieve plate 32 and affecting the subsequent screening process.

[0038] In a specific embodiment, one end of the second cleaning member 13 is fixed to the inside of the outer shell 31 by means of bolts or adhesive, and the other end extends to the middle of the sieve plate 32 .

[0039] Reference Figure 2 The upper end surfaces of the two sieve plates 32 are both set as inclined surfaces, and the height of the inclined surfaces decreases from the inner side to the outer side of the outer shell 31. With this setting, the lithium iron phosphate powder that falls to the high part of the inclined surface can roll to the lower part under the action of its own gravity, so that the lithium iron phosphate powder can contact more sieve holes, thereby improving the screening efficiency of the sieve plate 32.

[0040] Reference Figure 2 and Figure 4An annular partition 14 is rotatably arranged between the hollow plate 6 and the sieve plate 32 and between the two sieve plates 32, and the annular partition 14 surrounds the double-headed motor 7, the driving device 8, and the telescopic rod 11. The driving device 8 is fixed to the annular partition 14 by bolts or the like. An annular groove is provided on the opposite side of the two sieve plates 32, and the annular partition 14 is rotatably embedded in the annular groove, and the second cleaning member 13 extends to the outside of the annular partition 14 at one end toward the middle of the sieve plate 32. Under such an arrangement, the lithium iron phosphate powder that falls during the sieving process can be prevented from falling onto the double-headed motor 7 or the driving device 8 and causing them to get stuck.

[0041] Reference Figure 3 A plurality of balls 15 are arranged between the side of the sieve plate 32 and the outer shell 31. A groove is opened on the side of the outer shell 31. The balls 15 are rotatably embedded in the groove. With this arrangement, the friction between the sieve plate 32 and the outer shell 31 can be reduced, so that the sieve plate 32 can rotate more smoothly.

[0042] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships 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.

[0043] Those skilled in the art should understand that the above embodiments are only for the purpose of clearly illustrating the present invention, and are not intended to limit the scope of the present invention. For those skilled in the art, other changes or modifications may be made based on the above disclosure, and these changes or modifications are still within the scope of the present invention.

Claims

1. A lithium iron phosphate grinding and screening device, comprising a feeding part (1), a grinding part (2), a screening part (3), a discharging part (4) and a supporting base (5), characterized in that: The screening part (3) comprises an outer shell (31) and two screening plates (32) with different sieve hole sizes. The two screening plates (32) are rotatably arranged in the outer shell (31), and a hollow plate (6) is fixedly arranged above the two screening plates (32). The hollow plate (6) and the two screening plates (32) are both provided with a plurality of hollow parts for lithium iron phosphate powder to pass through, and the hollow parts are evenly distributed in a ring shape. A double-headed motor (7) is also provided between the two screening plates (32) so as to be able to rise and fall, and a driving device (8) is provided for making the double-headed motor (7) rise and fall. The upper and lower rotating shaft ends of the double-headed motor (7) are both fixedly sleeved with an external gear (9), and the middle parts of the two screening plates (32) are both provided with an internal gear (10) meshing with the external gear (9).

2. A lithium iron phosphate grinding and screening device according to claim 1, characterized in that: It also comprises a telescopic rod (11), one end of the telescopic rod (11) facing downward is fixedly mounted on the upward rotating shaft end of the double-headed motor (7), and the other end extends to the hollow plate (6) and is fixedly mounted with a first cleaning member (12), the first cleaning member (12) being rotatably abutted against the upper end surface of the hollow plate (6), and the sieve plate (32) located above the double-headed motor (7) being rotatably sleeved on the outer side of the telescopic rod (11).

3. A lithium iron phosphate grinding and screening device according to claim 1, characterized in that: Two second cleaning members (13) are also fixedly disposed in the outer shell (31), and the two second cleaning members (13) are respectively in contact with the upper end surfaces of the two sieve plates (32).

4. A lithium iron phosphate grinding and screening device according to claim 1, characterized in that: The upper end surfaces of the two sieve plates (32) are both arranged as inclined surfaces, and the height of the inclined surfaces decreases gradually from the inner side to the outer side of the outer shell (31).

5. The lithium iron phosphate grinding and screening device according to claim 2, characterized in that: An annular partition plate (14) is rotatably arranged between the hollow plate (6) and the sieve plate (32) and between the two sieve plates (32), and the annular partition plate (14) surrounds the double-headed motor (7), the driving device (8) and the telescopic rod (11).

6. The lithium iron phosphate grinding and screening device according to claim 1, characterized in that: A plurality of balls (15) are arranged between the side surface of the sieve plate (32) and the outer shell (31).

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