A lithium iron phosphate particle size detection device

Abstract

This utility model belongs to the technical field of particle size detection equipment, and particularly relates to a lithium iron phosphate particle size detection device. Addressing the problem that existing devices lack precise control in the sample screening process, allowing ungraded particles to directly enter the detection area, resulting in uneven particle distribution and affecting the accuracy of screening and detection, the following solution is proposed: The detection device includes an outer chamber and a laser particle size analyzer body installed outside the outer chamber for analyzing and detecting the particle size of lithium iron phosphate. The beneficial effects of this utility model are: particle size classification and screening are achieved through multi-specification baffles, and the baffles are precisely matched with the discharge trough to prevent unscreened particles from mixing in; the stirring rod, combined with counter-spiral dispersing blades, completely breaks up particle agglomeration, ensuring sample uniformity; and the combined effect of multiple designs significantly reduces detection errors.

Description

Technical Field

[0001] This utility model relates to a particle size detection device, specifically a lithium iron phosphate particle size detection device, and belongs to the technical field of particle size detection devices. Background Technology

[0002] Lithium iron phosphate (LFP), as a high-performance cathode material for lithium-ion batteries, is widely used in new energy vehicles, energy storage systems, and other fields due to its excellent safety, cycle life, and cost advantages. In the production and preparation process of LFP, its particle size and distribution characteristics are the core indicators that determine the electrochemical performance of the product. If the particle size is too small, the specific surface area of ​​the material will be too large, increasing electrolyte consumption and aggravating interfacial side reactions. If the particle size is too large, it will reduce the ion diffusion rate and affect the rate performance of the battery. Therefore, accurate particle size detection of LFP is a key link in achieving product quality control and production process optimization.

[0003] In the prior art, such as the resin raw material particle size detection device disclosed in announcement number CN217342238U, the particle size detection device greatly improves the inspection efficiency of raw material particles by combining the detection shell and the vibration box. However, the above-mentioned prior art has the following shortcomings: when the above-mentioned particle size detection device is used, the sample screening process lacks precise control, and particles that have not undergone strict grading directly enter the detection area, resulting in uneven particle distribution and affecting the accuracy of screening and detection. Summary of the Invention

[0004] The purpose of this invention is to provide a lithium iron phosphate particle size detection device to solve the problem that the sample screening process of the above-mentioned devices lacks precise control, and particles that have not undergone strict grading directly enter the detection area, resulting in uneven particle distribution and affecting the accuracy of screening and detection.

[0005] This utility model achieves the above-mentioned objective through the following technical solution: a lithium iron phosphate particle size detection device, including an outer chamber and a laser particle size analyzer body installed on the outside of the outer chamber for analyzing and detecting the particle size of lithium iron phosphate; The bottom of the outer compartment is provided with a discharge trough for discharging lithium iron phosphate particles. A detection plate is fixedly installed in the discharge trough. Multiple detection grooves are provided on the surface of the detection plate. The detection probe of the laser particle size analyzer body is located in the detection groove. An inner chamber is set inside the outer chamber. Multiple perforated plates for controlling the discharge of different particle sizes are fixed at equal intervals on the surface of the inner chamber. The diameter of the through holes opened on the surface of the multiple perforated plates is different.

[0006] As a further improvement of this utility model: the size of the sluice plate is adapted to the size of the discharge trough, and when the lithium iron phosphate particles are discharged, the sluice plate covers the surface of the discharge trough.

[0007] As a further embodiment of this utility model: the bottom surface of the detection plate is provided with a bottom baffle for controlling the discharge of lithium iron phosphate particles after detection. An L-shaped slider is fixedly installed on the surface of the bottom baffle. A groove adapted to the L-shaped slider is opened on the surface of the detection plate. The bottom baffle is slidably connected to the bottom surface of the detection plate through the L-shaped slider and the groove.

[0008] As a further embodiment of this utility model: a servo motor is fixed on one side surface of the outer chamber for controlling the rotation of the inner chamber and replacing the filter plates of different particle sizes. The output end of the servo motor extends into the outer chamber and is connected to one side of the inner chamber.

[0009] As a further embodiment of this utility model: an installation plate is fixedly installed on the other side surface of the outer chamber, a servo motor II is installed on the surface of the installation plate, a drive shaft is provided inside the inner chamber, one end of the drive shaft passing through the outer chamber is connected to the output shaft end of the servo motor II, and a stirring rod for stirring lithium iron phosphate particles is installed on the surface of the drive shaft.

[0010] As a further improvement of this utility model: the surface of the stirring rod is equipped with multiple spiral dispersing blades, and the spiral directions of two adjacent spiral dispersing blades are arranged in opposite directions.

[0011] As a further embodiment of this utility model: a wedge-shaped control plate is fixedly installed at one end of the bottom baffle, and a control ball head rod for pushing the wedge-shaped control plate is fixedly installed on the surface of the transmission shaft.

[0012] As a further embodiment of this utility model: a T-shaped fixing rod is fixedly installed on the surface of the detection plate, a fixed slider is slidably connected to the surface of the T-shaped fixing rod, the fixed slider is fixedly installed on the surface of the bottom baffle, and a spring is sleeved on the surface of the T-shaped fixing rod, with one end of the spring abutting against one side surface of the fixed slider.

[0013] As a further improvement of this utility model: a receiving box for receiving lithium iron phosphate particles after testing is provided directly below the discharge trough at the bottom of the outer compartment.

[0014] The beneficial effects of this utility model are: This invention uses a laser particle size analyzer probe directly facing the detection tank to capture particle signals at close range. Multiple sizes of baffles enable particle size classification and screening, and the baffles are precisely matched with the discharge tank to prevent unscreened particles from mixing in. The stirring rod is equipped with reverse spiral dispersing blades to completely break up particle agglomeration and ensure sample uniformity. The combined effect of these multiple designs significantly reduces detection errors. Servo motor one drives the inner chamber to rotate, quickly switching between different baffles, eliminating the tedious manual replacement. Servo motor two drives the transmission shaft to rotate, simultaneously realizing particle stirring and automatic opening and closing of the bottom baffle. By controlling the mechanical linkage between the ball head rod and the wedge control plate, the material is automatically discharged after the test is completed. The entire process reduces manual intervention, which not only improves the testing efficiency but also avoids human operation errors. The bottom baffle opens and closes stably through a slider and groove structure, and the spring force ensures a reliable seal during testing. The receiving box collects the particles after testing, avoiding material waste and environmental pollution, while also facilitating subsequent processing or retesting. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the internal structure of the outer and inner warehouses in this utility model; Figure 3 In this utility model Figure 2 A schematic diagram of the bottom structure; Figure 4 This is a schematic diagram of the inner chamber and the perforated plate in this utility model; Figure 5 This is a schematic diagram of the structure of the stirring rod and the spiral dispersing blades in this utility model; Figure 6 This is a schematic diagram of the structure of the detection plate, detection groove and discharge groove in this utility model; Figure 7 This is a schematic diagram of the structure of the L-shaped slider and the bottom baffle in this utility model; Figure 8 This is a schematic diagram of the structure of the drive shaft and wedge-shaped control plate in this utility model; Figure 9 In this utility model Figure 6 An enlarged schematic diagram of the structure at point A in the diagram.

[0016] In the diagram: 1. Outer chamber; 2. Laser particle size analyzer body; 3. Discharge chute; 4. Detection plate; 5. Detection groove; 6. L-shaped slider; 7. Slide groove; 8. T-shaped fixing rod; 9. Spring; 10. Fixing slider; 11. Servo motor one; 12. Inner chamber; 13. Squeegee plate; 14. Mounting plate; 15. Servo motor two; 16. Drive shaft; 17. Control ball head rod; 18. Wedge-shaped control plate; 19. Stirring rod; 20. Spiral dispersing blade; 21. Receiving box; 22. Bottom baffle. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] Example 1 like Figures 1 to 9 As shown, a lithium iron phosphate particle size detection device includes an outer chamber 1 and a laser particle size analyzer body 2 installed on the outside of the outer chamber 1 for analyzing and detecting the particle size of lithium iron phosphate. The bottom of the outer chamber 1 is provided with a discharge trough 3 for discharging lithium iron phosphate particles. A detection plate 4 is fixedly installed in the discharge trough 3. Multiple detection grooves 5 are provided on the surface of the detection plate 4. The detection probe of the laser particle size analyzer body 2 is located in the detection groove 5. An inner chamber 12 is provided inside the outer chamber 1. Multiple perforated plates 13 for controlling the discharge of different particle sizes are fixed at equal intervals on the surface of the inner chamber 12. The diameters of the through holes opened on the surface of the multiple perforated plates 13 are different.

[0019] The laser particle size analyzer body 2 is installed on the outside of the outer chamber 1, and its detection probe is located inside the detection slot 5. This arrangement allows the detection probe to perform particle size analysis of lithium iron phosphate particles in the detection slot 5 at close range and with precision, improving the accuracy of the detection. The discharge slot 3 provides a channel for the discharge of lithium iron phosphate particles, guiding the particles into the detection area in an orderly manner. Multiple detection slots 5 on the surface of the detection plate 4 can detect multiple samples simultaneously. At the same time, the detection slots 5 can confine the particles to a specific area, ensuring that the detection probe of the laser particle size analyzer can stably detect the particles and avoid particle dispersion affecting the detection results. Multiple baffles 13 are fixed at equal intervals on the surface of the inner chamber 12, and the diameter of the through holes on the surface of the baffles 13 is different. Through the through holes of different diameters, lithium iron phosphate particles of different sizes can be separated, realizing the detection of particles within a specific size range and meeting the needs of detecting particles of different sizes.

[0020] Furthermore, the size of the sluice plate 13 is adapted to the size of the discharge trough 3, and when the lithium iron phosphate particles are discharged, the sluice plate 13 covers the surface of the discharge trough 3.

[0021] The stencil 13 completely blocks the discharge trough 3, ensuring that only particles of a specific size that pass through the through holes of the stencil 13 can enter the discharge trough 3. This prevents unscreened particles from directly entering the detection area and ensures that the particles entering the detection trough 5 meet the current stencil 13 screening standards, thereby guaranteeing the accuracy of the detection results.

[0022] Furthermore, the bottom surface of the detection plate 4 is provided with a bottom baffle 22 for controlling the discharge of lithium iron phosphate particles after detection. An L-shaped slider 6 is fixedly installed on the surface of the bottom baffle 22. A groove 7 adapted to the L-shaped slider 6 is opened on the surface of the detection plate 4. The bottom baffle 22 is slidably connected to the bottom surface of the detection plate 4 through the L-shaped slider 6 and the groove 7.

[0023] The bottom baffle 22 is opened and closed by means of a sliding connection. When testing is performed, the bottom baffle 22 is closed to prevent lithium iron phosphate particles from leaking out in advance during the testing process, ensuring that the particles are fully detected in the detection groove 5. After the testing is completed, the bottom baffle 22 is opened to facilitate the discharge of particles. The cooperation between the L-shaped slider 6 and the groove 7 ensures that the bottom baffle 22 can slide more stably.

[0024] Furthermore, a servo motor 11 for controlling the rotation of the inner chamber 12 and replacing the filter plates 13 of different particle sizes is fixed on one side surface of the outer chamber 1. The output end of the servo motor 11 extends into the outer chamber 1 and is connected to one side of the inner chamber 12.

[0025] Driven by servo motor 11, the inner chamber 12 is rotated, thereby enabling the replacement of different slugs 13. The slugs 13 of the corresponding particle size can be rotated quickly and accurately to be directly above the discharge trough 3.

[0026] Example 2 Improvements based on Example 1: Furthermore, a mounting plate 14 is fixedly installed on the other side surface of the outer chamber 1, and a servo motor 15 is installed on the surface of the mounting plate 14. A drive shaft 16 is provided inside the inner chamber 12. One end of the drive shaft 16 passes through the outer chamber 1 and is connected to the output shaft end of the servo motor 15. A stirring rod 19 for stirring lithium iron phosphate particles is installed on the surface of the drive shaft 16.

[0027] Servo motor 15 drives transmission shaft 16 to rotate, which in turn drives stirring rod 19 to rotate, stirring lithium iron phosphate particles in inner chamber 12. This allows the particles to be fully mixed, preventing particle agglomeration or accumulation, and ensuring that the particles can move evenly to the baffle plate 13, thus facilitating the screening of lithium iron phosphate particles.

[0028] Furthermore, the surface of the stirring rod 19 is equipped with multiple spiral dispersing blades 20, with the spiral directions of two adjacent spiral dispersing blades 20 being opposite.

[0029] The opposing spirals generate opposing thrusts when they rotate, which allows lithium iron phosphate particles to diffuse and mix more fully within the inner chamber 12. Compared to spiral blades in a single direction, this arrangement can more effectively break up particle agglomeration and ensure uniform particle distribution.

[0030] Furthermore, a wedge-shaped control plate 18 is fixedly installed at one end of the bottom baffle 22, and a control ball head rod 17 for pushing the wedge-shaped control plate 18 is fixedly installed on the surface of the drive shaft 16.

[0031] When the drive shaft 16 rotates, the control ball joint 17 rotates accordingly. When the control ball joint 17 contacts the wedge-shaped control plate 18, it will generate a thrust on the wedge-shaped control plate 18. Due to the characteristics of the wedge structure, this thrust will be converted into a force that makes the bottom baffle 22 slide, thereby realizing the opening of the bottom baffle 22. The bottom baffle 22 is automatically opened after the detection is completed without manual operation.

[0032] Furthermore, a T-shaped fixing rod 8 is fixedly installed on the surface of the detection plate 4, and a fixed slider 10 is slidably connected to the surface of the T-shaped fixing rod 8. The fixed slider 10 is fixedly installed on the surface of the bottom baffle 22, and a spring 9 is sleeved on the surface of the T-shaped fixing rod 8. One end of the spring 9 abuts against one side surface of the fixed slider 10.

[0033] Spring 9 has elastic potential energy, which will generate a continuous elastic force on the fixed slider 10. This elastic force is transmitted to the bottom baffle 22 through the fixed slider 10, so that the bottom baffle 22 can fit tightly against the bottom surface of the detection plate 4 when it is not in operation (i.e. during the detection process), ensuring the sealing effect of the bottom baffle 22 and preventing particles from leaking out in advance.

[0034] Furthermore, a receiving box 21 for receiving lithium iron phosphate particles after testing is provided directly below the discharge trough 3 at the bottom of the outer compartment 1.

[0035] It allows for the centralized collection of detected particles, preventing them from scattering and causing waste or environmental pollution. It also facilitates subsequent processing or re-detection of the detected particles.

[0036] Working principle: After the equipment is started, the lithium iron phosphate particles to be tested are fed into the inner chamber 12 through the feeding port on the outer chamber 1. At this time, the servo motor 15 drives the transmission shaft 16 to rotate, and the stirring rod 19 and the spiral dispersing blade 20 on the surface of the transmission shaft 16 rotate accordingly. Since the spiral directions of adjacent spiral dispersing blades 20 are opposite, they will form opposing thrusts during the stirring process, so that the lithium iron phosphate particles are fully mixed in the inner chamber 12 and diffused to the surroundings, avoiding particle accumulation. When it is necessary to detect particles within a certain size range, the servo motor 11 is started, and its output drives the inner chamber 12 to rotate, causing the strainer plate 13 on the surface of the inner chamber 12 to rotate directly above the discharge trough 3 at the bottom of the outer chamber 1, and the strainer plate 13 completely covers the discharge trough 3. The lithium iron phosphate particles in the inner chamber 12 move towards the strainer plate 13 under the action of stirring force. Particles that match the diameter of the through hole of the strainer plate 13 fall into the discharge trough 3 below through the strainer plate 13 and enter the detection groove 5 on the surface of the detection plate 4. It should be noted that during detection, the strainer plate 13 with a small diameter and through hole is selected first, and as the detection process progresses, the strainer plate 13 with a gradually increasing through hole diameter is selected by the servo motor 11. The detection probe of the laser particle size analyzer body 2 is located in the detection groove 5, which can perform particle size analysis on lithium iron phosphate particles falling into the detection groove 5. During the detection process, the bottom baffle 22 is in a closed state. By positioning the L-shaped slider 6 in the slide groove 7, the bottom baffle 22 is tightly attached to the bottom surface of the detection plate 4 to prevent particles from leaking out in advance. At the same time, the spring 9 on the surface of the T-shaped fixing rod 8 applies elastic force to the fixing slider 10 to further ensure the sealing effect of the bottom baffle 22. After the test is completed, the drive shaft 16 continues to rotate, and the control ball joint 17 on its surface rotates together. When the control ball joint 17 contacts the wedge-shaped control plate 18, it will generate a thrust on the wedge-shaped control plate 18, causing the bottom baffle 22 to slide along the slide groove 7 through the L-shaped slider 6, thereby opening the channel at the bottom of the test plate 4. The tested lithium iron phosphate particles fall from the test groove 5 and are collected by the receiving box 21 below the discharge groove 3. It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0037] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A lithium iron phosphate particle size detection device, comprising an outer chamber (1) and a laser particle size analyzer body (2) installed outside the outer chamber (1) for analyzing and detecting the particle size of lithium iron phosphate; characterized in that: The bottom of the outer chamber (1) is provided with a discharge trough (3) for discharging lithium iron phosphate particles. A detection plate (4) is fixedly installed in the discharge trough (3). Multiple detection slots (5) are provided on the surface of the detection plate (4). The detection probe of the laser particle size analyzer body (2) is located in the detection slot (5). The outer chamber (1) is provided with an inner chamber (12). Multiple perforated plates (13) for controlling the discharge of different particle sizes are fixed at equal intervals on the surface of the inner chamber (12). The diameters of the through holes opened on the surfaces of the multiple perforated plates (13) are different.

2. The lithium iron phosphate particle size detection device according to claim 1, characterized in that: The size of the sluice plate (13) is adapted to the size of the discharge trough (3). When lithium iron phosphate particles are discharged, the sluice plate (13) covers the surface of the discharge trough (3).

3. The lithium iron phosphate particle size detection device according to claim 1, characterized in that: The bottom surface of the detection plate (4) is provided with a bottom baffle (22) for controlling the discharge of lithium iron phosphate particles after detection. An L-shaped slider (6) is fixedly installed on the surface of the bottom baffle (22). A groove (7) adapted to the L-shaped slider (6) is opened on the surface of the detection plate (4). The bottom baffle (22) is slidably connected to the bottom surface of the detection plate (4) through the L-shaped slider (6) and the groove (7).

4. The lithium iron phosphate particle size detection apparatus according to claim 1, characterized by: A servo motor (11) for controlling the rotation of the inner chamber (12) and replacing the filter plate (13) of different particle sizes is fixed on one side surface of the outer chamber (1). The output end of the servo motor (11) extends into the outer chamber (1) and is connected to one side of the inner chamber (12).

5. The lithium iron phosphate particle size detection apparatus according to claim 3, characterized by: An installation plate (14) is fixedly installed on the other side surface of the outer chamber (1). A servo motor (15) is installed on the surface of the installation plate (14). A drive shaft (16) is provided inside the inner chamber (12). One end of the drive shaft (16) that passes through the outer chamber (1) is connected to the output shaft end of the servo motor (15). A stirring rod (19) for stirring lithium iron phosphate particles is installed on the surface of the drive shaft (16).

6. The lithium iron phosphate particle size detection device according to claim 5, characterized in that: The surface of the stirring rod (19) is equipped with a plurality of spiral dispersing blades (20), and the spiral directions of two adjacent spiral dispersing blades (20) are opposite.

7. The lithium iron phosphate particle size detection apparatus according to claim 5, characterized by: A wedge-shaped control plate (18) is fixedly installed at one end of the bottom baffle (22), and a control ball head rod (17) for pushing the wedge-shaped control plate (18) is fixedly installed on the surface of the drive shaft (16).

8. The lithium iron phosphate particle size detection apparatus according to claim 1, characterized by: A T-shaped fixing rod (8) is fixedly installed on the surface of the detection plate (4). A fixed slider (10) is slidably connected to the surface of the T-shaped fixing rod (8). The fixed slider (10) is fixedly installed on the surface of the bottom baffle (22). A spring (9) is sleeved on the surface of the T-shaped fixing rod (8). One end of the spring (9) abuts against one side surface of the fixed slider (10).

9. The lithium iron phosphate particle size detection apparatus according to claim 1, characterized by: A receiving box (21) for receiving lithium iron phosphate particles after testing is provided directly below the discharge trough (3) opened at the bottom of the outer compartment (1).

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