Screening machine

Abstract

The utility model provides a screening machine capable of inhibiting the reduction of the productivity and improving the screening efficiency, so that particulate matters are not easy to agglomerate. The screening machine is used for screening tiny particles and comprises a supporting structure; a screen is arranged in the screening frame, and the screening frame is movably supported on the supporting structure through an elastic connecting piece; the vibration motor is fixedly connected to the screening frame and used for driving the screening frame to vibrate; and the ion fan is mounted on the screening frame and used for blowing airflow with positive and negative ions to the screen.

Description

Technical Field

[0001] This application relates to a screening machine. Background Technology

[0002] The preparation of positive and negative electrode sheets is particularly crucial in battery fabrication. The preparation methods for positive and negative electrode sheets include steps such as slurry preparation, coating and drying, rolling, and post-processing. Before mixing and preparing the slurry, it is necessary to ensure that the purity and particle size of the slurry particles meet the requirements. The slurry particles include metal oxides, carbon materials, etc., therefore it is necessary to sieve particles that are too large or too small.

[0003] In the prior art, screening machines are commonly used to screen particulate matter.

[0004] However, during the sieving process of granular cathode materials, multiple particles easily rub against each other, generating static electricity. This static electricity causes the particles to attract each other and form agglomerates. These agglomerates are difficult to pass through the screen. On the one hand, particles that originally meet the specified particle size are agglomerated and discharged as large particles or foreign objects that cannot pass through the screen, resulting in reduced production capacity. On the other hand, agglomerates easily clog the screen, leading to a decrease in sieving efficiency. Utility Model Content

[0005] This application was made in view of the above-mentioned problems. Its purpose is to provide a screening machine that can suppress the reduction of production capacity and improve screening efficiency.

[0006] According to one aspect of this application, a screening machine is used for screening fine particulate matter and includes: a support structure; a screening frame having a screen inside and being movably supported on the support structure by an elastic connector; a vibration motor fixedly connected to the screening frame for driving the screening frame to vibrate; and an ion fan installed on the screening frame for blowing an airflow carrying positive and negative ions onto the screen.

[0007] According to one aspect of this application, a screening machine can be provided that can suppress the reduction of production capacity and improve screening efficiency, making it less likely for particulate matter to agglomerate or clog the screen. Attached Figure Description

[0008] Figure 1 This is a schematic diagram illustrating the screening machine of this application.

[0009] Figure 2 This is a schematic diagram showing the internal structure of the screening machine of this application.

[0010] Figure 3 This is a schematic diagram showing the working state of the ion fan of the screening machine of this application. Detailed Implementation

[0011] To better understand the above-mentioned objectives, features, and advantages of this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. It should be noted that the number, proportion, and shape of the constituent elements depicted in the drawings are merely illustrative examples and are not intended to limit this application.

[0012] Reference Figure 1 and Figure 2 This illustrates an example of a screening machine 100 used in this application. The screening machine 100 is used for screening small particulate positive electrode materials of batteries with a size of approximately 0.5 to 30 μm. The screening machine 100 includes a support structure 10, multiple elastic connectors 20, a screening frame 30, a vibration motor 40, and an ion fan 60.

[0013] The support structure 10 is a cavity structure used to place the screening machine 100 stably on the ground. The support structure 10 includes a base 11. It is typically made of a robust material, such as steel or cast iron, to ensure the stability and durability of the machine during operation. The support structure 10 may further include multiple feet 12, which are capable of adjusting the height of the screening machine 100, allowing the screening machine 100 to be placed on the ground more stably.

[0014] Multiple elastic connectors 20 are springs, one end of which is connected to the upper end of the base 11 of the support structure 10, and the other end is connected to the lower end of the screening frame 30. Thus, through the elastic connectors 20, the screening frame 30 is movably supported on the support structure 10 with a certain gap, so that the vibration of the screening frame 30 is not directly transmitted to the support structure 10, thereby ensuring the stability of the support structure 10.

[0015] The screening frame 30 has a cavity structure and can vibrate up, down, left, right, back and forth under the drive of the vibrating motor 40. Specifically, the screening frame 30 has: a first frame 31, a second frame 32, a cover 33, and a screen 35.

[0016] The first frame 31 and the second frame 32 each have a receiving space inside, and a screen 35 is disposed between the first frame 31 and the second frame 32. The receiving space of the screening frame 30 is divided into two parts by the screen 35: one below the screen 35 (the receiving space of the first frame 31) and the other above the screen 35 (the receiving space of the second frame 32). The screen 35 contains a plurality of mesh openings. When the screening frame 30 vibrates, the screen 35 vibrates, and the particles on the screen 35 shake and disperse. Particles smaller than the mesh openings pass through the mesh openings of the screen 35. Particles with a size not smaller than the mesh openings are retained on the screen 35 and move towards the edge of the screen 35.

[0017] The first frame 31 is a bottomed cylindrical shape, connected to the end of the elastic connector 20 away from the supporting structure 10. A vibration motor 40 is installed at the bottom of the first frame 31, causing the screening frame 30 to vibrate as a whole through contact with the vibration motor 40. Furthermore, a discharge port 301 is provided on the side of the first frame 31. The discharge port 301 communicates with the internal receiving space of the first frame 31 and discharges the particles that have passed through the screen 35, thereby obtaining high-purity particles that meet the particle size requirements and have been freed from impurities. A baffle can be installed near the discharge port 301 to control the timing and amount of particle discharge.

[0018] The second frame 32 is a bottomless cylindrical shape, stacked on top of the first frame 31. The second frame 32 is not limited to the single one shown in the figure, and may also include multiple sub-frames stacked sequentially. These multiple sub-frames are typically two or three. By providing screens 35 at the bottom of each sub-frame, multi-stage screening can be achieved, and the mesh size of the multiple screens 35 can be set as needed. Furthermore, the second frame 32 (or each sub-frame) has a discharge port 302 on its side, which communicates with the receiving space of the second frame 32 and discharges particles or foreign objects that cannot pass through the screens 35 at the bottom of the second frame 32 (or each sub-frame). A baffle can be provided near the discharge port 302 to control the timing and amount of particles or foreign objects discharged. Additionally, the outer surface of the connection between adjacent first frames 31 and second frames 32 is fixed by a retaining ring 34, which can prevent the first frame 31 and second frame 32 from loosening during vibration. Furthermore, the outer surface of the connection between adjacent sub-frames of the second frame 32 can also be fixed by the clamping ring 34.

[0019] The cover 33 is dome-shaped and covers the side of the second frame 32 away from the first frame 31. The cover 33 has a through-hole 303 and an air inlet 304. There may be one or multiple inlets 303. The inlet 303 allows particulate matter to enter and communicates with the receiving space of the second frame 32. The air inlet 304 communicates with the receiving space of the second frame 32. An ion fan 60 is installed in the air inlet 304, allowing ionized airflow 63 from the ion fan 60 to enter the receiving space of the second frame 32. Furthermore, the interior of the air inlet 304 can also accommodate the ion fan 60. Additionally, the outer surfaces of adjacent second frames 32 and the cover 33 can be secured by a retaining ring 34. In addition, the feed inlet 303 is located at the top of the dome-shaped top of the cover 33, i.e., the center position, and the air inlet 304 is located on the outer periphery of the feed inlet 303 in the center and on the upper half of the dome-shaped part of the cover 33. This allows the ion fan 60 to be set on the side of the dome-shaped part of the cover 33 at a certain height away from the screen 35. This makes it convenient for the ion fan 60 to adjust the positive and negative ion release angle and the range of coverage of the screen 35.

[0020] The vibrating motor 40 is used to vibrate the screening frame 30. The vibrating motor 40 has a motor 41, two swing blocks 42 respectively connected to the upper and lower ends of the motor 41, and a flange 43. The upper part of the vibrating motor 40 can be fixedly connected to the bottom of the first frame 31 of the screening frame 30 via the flange 43, so that the vibrating motor 40 is fixed in an upright position. The lower part of the vibrating motor 40 passes through the gap between the screening frame 30 and the support structure 10 and enters the inner cavity of the support structure 10, allowing the lower part of the vibrating motor 40 away from the screening frame 30 to be freely housed by the support structure 10, thus reducing the height of the screening machine 100. Driven by the motor 41, at least the swing blocks 42 connected to the lower end of the motor 41 perform eccentric rotational motion, generating inertial excitation force, causing the vibrating motor 40 to sway and vibrate horizontally, vertically, and at an incline. Since the vibrating motor 40 is fixedly connected to the screening frame 30, it drives the entire screening frame 30 to vibrate. This vibration is transmitted to the screen 35 installed inside the screening frame 30, causing the screen 35 to vibrate as well. As a result, the particles on the screen 35 vibrate and move relative to the screen 35, thus passing through the screen 35 smoothly and effectively avoiding particle blockage.

[0021] An ion fan 60 is installed on the air inlet 304 of the screening frame 30. The function of the ion fan 60 is to eliminate static electricity generated by particulate matter during the screening process, preventing particulate matter from adhering to the screen 35 or clumping due to static attraction, thus avoiding a decrease in screening efficiency and production capacity. Figure 3As shown, the ion blower 60 includes a housing 600, an ion generator 61, and a fan 62. The housing 600 houses the ion generator 61 and the fan 62. The housing 600 has a blowout surface 601, and the fan 62 is located on the side of the ion generator 61 away from the blowout surface 601. The blowout surface 601 is the surface from which the ion blower 60 releases ions generated by the ion generator 61. The ion generator 61 may include a discharge medium in the shape of a tip, which can ionize air to generate ions under the action of a high-voltage power supply (e.g., high-voltage alternating current). The fan 62 faces a screen 35 and blows an ionized airflow 63 onto the screen 35. The airflow 63 from the ion blower 60 is blown out radially (e.g., 5°~150°). The ionized airflow 63 can be positively ionized, negatively ionized, or a mixture of both depending on the material of the discharge medium. The ionized airflow 63 contains an ion concentration of 5000~40000 ions / cm³, thereby efficiently eliminating static electricity from particulate matter. Preferably, the blowing surface 601 of the ion fan 60 is inclined relative to the screen 35, which optimizes the airflow direction and coverage. The inclination of the blowing surface 601 of the ion fan 60 can be achieved by installing the ion fan 60 at an incline on the air inlet 304, or by installing the ion fan 60 on an inclined cover 33. Furthermore, the angle of inclination of the blowing surface 601 of the ion fan 60 relative to the screen 35 and the position of the ion fan 60 on the cover 33 can be appropriately set. In addition, since the adhesion of particulate matter to the screen 35 due to electrostatic attraction is reduced, the frequency of replacing or cleaning the screen 35 is reduced, avoiding increased costs and reduced production capacity.

[0022] Furthermore, the screening machine 100 includes an ultrasonic component 50, which includes an ultrasonic generator 51, a transducer 52, and a resonant ring 53. The ultrasonic generator 51 supplies power to the transducer 52, which causes the resonant ring 53 to generate ultrasonic waves. The resonant ring 53 contacts the screen 35, thereby transmitting the ultrasonic waves to the screen 35. The ultrasonic component 50 can increase the frequency and direction of vibration, resulting in better filtration of the screen 35.

[0023] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A screening machine for screening fine particulate matter, characterized in that, include: Support structure; A screening frame, which has a screen inside, is movably supported on the support structure by an elastic connector; A vibrating motor is fixedly connected to the screening frame and is used to drive the screening frame to vibrate; as well as An ion fan, installed in the screening frame, is used to blow an airflow containing positive and negative ions onto the screen.

2. The screening machine according to claim 1, characterized in that, The screening frame has a cavity structure, and an air inlet is provided on the upper surface of the screening frame. The air inlet is connected to the interior of the screening frame and is positioned facing the screen. The ion fan is installed at the air inlet.

3. The screening machine according to claim 1, characterized in that, The blowing surface of the ion blower is inclined relative to the screen.

4. The screening machine according to claim 1, characterized in that, The ion fan includes a housing, an ion generator, and a fan. The ion generator and the fan are housed within the housing. The housing has a blowout surface, and the fan is located further away from the blowout surface relative to the ion generator. Positive and negative ions generated by the ion generator are blown from the blow-out surface toward the screen by the fan.

5. The screening machine according to claim 1, characterized in that, The concentration of positive and negative ions in the airflow is 5,000 to 40,000 per cm³.

6. The screening machine according to claim 1, characterized in that, The screening frame has: The first frame is connected to one end of the elastic connector, and the other end of the elastic connector is connected to the support structure; A second frame, connected to the first frame and located on the side of the first frame away from the supporting structure; and A cover body is provided on the side of the second frame away from the first frame, and a feed inlet is provided, the feed inlet being positioned facing the screen. The screen is connected to the inner wall of the second frame. There are multiple retaining rings, at least one of which is sleeved at the position where the first frame and the second frame are connected, and at least one of which is sleeved at the position where the cover is connected to the second frame.

7. The screening machine according to claim 6, characterized in that, The second frame includes multiple connected sub-frames, which are arranged vertically, and the binding ring is sleeved at the connection position of adjacent sub-frames.

8. The screening machine according to claim 6, characterized in that, The cover has at least one feed inlet, which allows the fine particles to enter the screening frame. The second frame has a discharge port, and the interior of the second frame communicates with the discharge port, which is located on the upper side of the screen. The first frame has a discharge port, and the interior of the first frame is connected to the discharge port. The discharge port is located on the lower side of the screen.

9. The screening machine according to claim 1, characterized in that, The screening machine also includes an ultrasonic component, which includes an ultrasonic generator, a transducer, and a resonant ring. The ultrasonic generator provides power to the transducer, and the transducer causes the resonant ring to generate ultrasonic waves. The resonant ring contacts the screen, thereby transmitting the ultrasonic waves to the screen.

10. The screening machine according to claim 1, characterized in that, The vibrating motor has a motor, two sling blocks connected to the upper and lower ends of the motor respectively, and a flange. The vibrating motor is connected to the bottom of the screening frame through the flange and is movably mounted in the inner cavity of the support structure away from the screening frame. Driven by the motor, at least the sling blocks connected to the lower end of the motor rotate eccentrically, causing the vibrating motor to vibrate and causing the screening frame and the screen mesh set inside to vibrate.

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