An ultrasonic screening machine

Abstract

This utility model provides an ultrasonic screening machine, belonging to the field of screening machine technology. It solves the problem of how to adapt a screening machine to the screening of lithium battery materials while ensuring durability. The ultrasonic screening machine includes a vibrating base, on which a frame with an ultrasonic transducer is mounted. A screen assembly is fixed on the frame, comprising a metal screen frame and a plastic screen. The metal screen frame has a ring-shaped structure and an inwardly extending ring-shaped support portion. The outer edge of the plastic screen is fixed to the outer side of the metal screen frame, and the inner edge of the plastic screen is fixed to the inner side of the support portion. A vibration gap exists between the plastic screen and the support portion. The support portion and the entire metal screen frame provide support for the plastic screen, preventing it from exceeding its deformation limit and causing damage. This screen assembly design ensures durability while meeting the requirements for screening lithium battery materials.

Description

Technical Field

[0001] This utility model belongs to the field of screening machine technology, and relates to a screening machine, and more particularly to an ultrasonic screening machine. Background Technology

[0002] In the lithium battery / semiconductor industry, the screening and filtration of ultrafine powders, highly corrosive materials, and metal-sensitive materials place certain requirements on screening machines. The lithium battery industry adheres to zero-metal contact in powder screening, meeting the stringent requirement of Cu / Zn ≤ 0.5 μg / m³. Existing ultrasonic screening machines, such as the micron-sized particle screening machine previously applied for by our company (application number ZL202020871176.5), mainly include a vibrating base and a screen disc for resonant screening. The screen frame and screen mesh are made of metal, offering good durability and wear resistance. Teflon is sprayed onto the metal screen frame and screen mesh to isolate the lithium battery material from contact with the metal screen frame and screen mesh, thus avoiding excessive copper and zinc content after screening. However, after vibration and high-frequency ultrasonic vibration, the Teflon coating on the screen mesh of such equipment is easily worn or peeled off. When the coating falls off and the lithium battery material comes into contact with the metal screen mesh, metal contamination occurs. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model provides an ultrasonic screening machine. It solves the technical problem of how to adapt the screening machine to the screening of lithium battery materials while ensuring durability.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: An ultrasonic screening machine includes a vibrating base, on which a frame with an ultrasonic transducer is mounted. A screen assembly is fixed on the frame. The screen assembly includes a metal screen frame and a plastic screen. The metal screen frame has an annular structure and has an annular support extending inward. The outer edge of the plastic screen is fixed to the outer side of the metal screen frame, and the inner edge of the plastic screen is fixed to the inner side of the support. A vibration gap exists between the plastic screen and the support.

[0005] The screening machine includes a frame and a screen assembly. The frame with an ultrasonic transducer can amplify the vibration of the screen assembly, making it screen materials more quickly. The plastic screen that comes into direct contact with the material on the screen assembly of this application is made of non-metallic plastic material. This design of the plastic screen will not release metal powder when it vibrates and comes into contact with the material, so that the screened material meets the stringent requirement of Cu / Zn≤0.5μg / m³. Due to the special nature of its material, plastic screens need to be used in conjunction with metal screen frames. Metal screen frames do not vibrate during screening, thus preventing metal contamination. The metal screen frame of this application has a protruding support portion on its inner side. This support portion provides fixed support for the inner edge of the plastic screen, while the outer edge of the plastic screen is fixed to the outer side of the metal screen frame. The support portion essentially forms a location to accommodate the plastic screen, while maintaining a certain vibration gap between the plastic screen and the support portion. This ensures that the plastic screen can maintain its basic vibration screening function, while the support portion and the entire metal screen frame provide support for the plastic screen, preventing it from exceeding its deformation limits and causing damage. This screen assembly design ensures durability while meeting the requirements for lithium battery material screening.

[0006] In the aforementioned ultrasonic screening machine, the support part includes several long strip-shaped protrusions, which are evenly distributed on the inner circumference of the metal screen frame. There is a hollow space between adjacent protrusions, and the ends of all the protrusions are connected by protruding rings. The inner edge of the plastic screen is fixed to the protruding rings.

[0007] The support part of this application consists of spaced-apart protrusions with a hollow space between them. This design can significantly reduce the contact area between the plastic screen and the support part, thereby improving the screening efficiency of the plastic screen.

[0008] In the aforementioned ultrasonic screening machine, the height of the end of the convex rod near the convex ring is higher than the height of the end of the convex rod near the metal screen frame, so that the vibration gap gradually increases from the side where the convex ring is located to the side where the metal screen frame is located.

[0009] The outer end of the protruding rod in this application has a low height and the inner end has a high height. This design makes the vibration gap between the plastic screen and the protruding rod larger on the outside and smaller on the inside, resulting in a large vibration amplitude on the outside and a high vibration frequency on the inside. This allows large particles to move from the inside to the outside, which can speed up the screening efficiency.

[0010] In the aforementioned ultrasonic screening machine, the frame includes a frame body made of plastic material, a frame support made of plastic material protruding from the inner side of the frame body, and the frame body and the frame support are integrally formed.

[0011] The frame of this application is also made of plastic, and the frame support is also made of plastic. The combination of the plastic frame and the plastic screen can ensure that the screened material does not come into contact with metal. The overall strength of the plastic frame is insufficient, so an integrally molded frame support needs to be added to its inner side to improve the strength. Therefore, this screening machine is adapted to the screening of lithium battery materials while ensuring durability.

[0012] In the aforementioned ultrasonic screening machine, the frame support includes several radially inwardly protruding pillars extending from the inner periphery of the frame body. All the pillars are spaced apart and their ends are connected to each other to form a closed loop.

[0013] In the aforementioned ultrasonic screening machine, the vibrating base includes a mounting plate and a base housing. A vibrating motor is installed inside the base housing. The mounting plate and the base housing are connected by several sets of springs. An upper swing block and a lower swing block are connected above and below the vibrating motor, respectively. When the vibrating motor rotates, it can drive the upper swing block and the lower swing block to rotate, causing the mounting plate to vibrate. The frame is mounted on the mounting plate.

[0014] In the aforementioned ultrasonic screening machine, there are multiple frames, which are stacked together and locked and fixed by clamping rings.

[0015] In the aforementioned ultrasonic screening machine, the screen components are all installed between adjacent frames. The outer edge of the metal screen frame has a protruding ring pressure band. The ring pressure band is circumferentially matched with the frame and is locked between adjacent frames. The outer side of the ring pressure band is wrapped with a sealing gasket, and when the retaining ring is tightened, the adjacent frames squeeze the sealing gasket to form a seal.

[0016] In the aforementioned ultrasonic screening machine, the ultrasonic screening machine further includes a top frame and a bottom frame. The bottom of the bottom frame is closed and has a discharge port on its side near the bottom. The bottom frame is fixed on the vibrating base. The frames are stacked and fixed on the bottom frame. The top frame has a feeding channel. A material distributor is provided at the outlet of the feeding channel. The top frame is fixed to the topmost frame.

[0017] In the aforementioned ultrasonic screening machine, observation windows are provided on the top frame and other parts of the frame.

[0018] The beneficial effects of this utility model are: 1. This screening machine includes a frame and a screen assembly. The frame with an ultrasonic transducer can amplify the vibration of the screen assembly, making it screen materials more quickly. The plastic screen that comes into direct contact with the material on the screen assembly of this application is made of non-metallic plastic material. This design of the plastic screen will not release metal powder when it vibrates and comes into contact with the material, so that the screened material meets the stringent requirement of Cu / Zn≤0.5μg / m³. 2. The inner side of the metal screen frame has a protruding support part. The support part is used to install and fix the plastic screen mesh so that the plastic screen mesh can ensure the basic function of vibrating screening of materials without exceeding the deformation limit and causing damage. This achieves the requirement of lithium battery material screening while ensuring durability. 3. The frame is also made of plastic, which is not strong enough. Therefore, an integrally molded frame support is added to the inside to improve the strength. The combination of the plastic frame and the plastic screen can ensure that the screened material does not come into contact with metal, so that the screening machine can be adapted to the screening of lithium battery materials while ensuring durability. Attached Figure Description

[0019] Figure 1 This is a side view of the present invention; Figure 2 This is a front view of the present invention; Figure 3 This is a cross-sectional view of the present invention; Figure 4 This is a part drawing of the frame of this utility model.

[0020] In the diagram: 1. Vibration base; 11. Mounting plate; 12. Base housing; 13. Vibration motor; 14. Spring; 15. Upper throwing block; 16. Lower throwing block; 2. Ultrasonic transducer; 3. Frame; 31. Frame body; 32. Frame support; 4. Screen assembly; 41. Metal screen frame; 42. Plastic screen; 43. Support part; 431. Protruding rod; 432. Protruding ring; 44. Vibration gap; 45. Ring compression band; 46. Sealing gasket; 5. Binding ring; 6. Top frame; 61. Feed channel; 7. Bottom frame; 71. Discharge port; 8. Distributor; 9. Observation window. Detailed Implementation

[0021] like Figures 1-4An ultrasonic screening machine is shown, comprising a vibrating base 1, a bottom frame 7, several frames 3, and a top frame 6. This embodiment shows two frames 3. The vibrating base 1 includes a mounting plate 11 and a base housing 12. A vibrating motor 13 is mounted inside the base housing 12. The mounting plate 11 and the base housing 12 are connected by several sets of springs 14. An upper swing block 15 and a lower swing block 16 are connected to the upper and lower parts of the vibrating motor 13, respectively. When the vibrating motor 13 rotates, it can drive the upper swing block 15 and the lower swing block 16 to rotate, causing the mounting plate 11 to vibrate. All frames 3 are mounted on the mounting plate 11. For detailed assembly of the vibrating base 1, please refer to our prior patent application number ZL202122297745.7, which will not be elaborated here. The bottom of the bottom frame 7 is closed, and it has a discharge port 71 on its side near the bottom. A baffle plate protrudes from the bottom of the bottom frame 7 near the discharge port 71, which guides the material into the discharge port 71 for discharge. The bottom frame 7 is fixed to the vibrating base 1, and the frames 3 are stacked and fixed to the bottom frame 7. The bottom frame 7 and the vibrating base 1, as well as the bottom frame 7 and the frames 3, are all locked together using clamping rings 5. The clamping rings 5 ​​are common fasteners and will not be elaborated upon here. The top frame 6 has a feed channel 61, and a distributor 8 is installed at the outlet of the feed channel 61. The distributor 8 ensures that the slurry is evenly spread on the screen and prevents damage to the screen due to feed pressure. The top frame 6 is connected and fixed to the topmost frame 3 using clamping rings 5. Observation windows 9 are provided on the top frame 6 and each frame 3. Transducer fixing components are fixed on the outer periphery of the frames 3. These transducer fixing components are suitable for installing and fixing the ultrasonic transducer 2, and their special design prevents the ultrasonic transducer 2 from overheating during long-term operation.

[0022] A screen assembly 4 is fixed on the frame 3. The screen assembly 4 includes a metal screen frame 41 and a plastic screen 42. The metal screen frame 41 has a ring-shaped structure and an inwardly extending ring-shaped support portion 43. The outer edge of the plastic screen 42 is fixed to the outer side of the metal screen frame 41, and the inner edge of the plastic screen 42 is fixed to the inner side of the support portion 43. A vibration gap 44 exists between the plastic screen 42 and the support portion 43. The screening machine includes a frame 3 and a screen assembly 4. The frame 3, equipped with an ultrasonic transducer 2, can intensify the vibration of the screen assembly 4, enabling it to screen materials more quickly. In this application, the plastic screen 42, which is in direct contact with the material, is made of non-metallic plastic material. This design prevents the release of metal powder when the plastic screen 42 vibrates and comes into contact with the material, ensuring that the screened material meets the stringent requirement of Cu / Zn≤0.5μg / m³. Due to the special nature of its material, the plastic screen 42 needs to be used in conjunction with a metal screen frame 41. The metal screen frame 41 does not vibrate during screening, thus preventing metal contamination. The inner side of the metal screen frame 41 of this application has a protruding support part 43, which can fix and support the inner edge of the plastic screen 42. The outer edge of the plastic screen 42 is fixed to the outer side of the metal screen frame 41. The support part 43 forms a position to accommodate the plastic screen 42. At the same time, a certain vibration gap 44 is maintained between the plastic screen 42 and the support part 43. This ensures that the plastic screen 42 can maintain its basic vibration screening function, while the support part 43 and the entire metal screen frame 41 can support the plastic screen 42 and prevent it from exceeding its deformation limit and causing damage. This screen assembly 4 design can meet the requirements of lithium battery material screening while ensuring durability.

[0023] Furthermore, the support portion 43 includes several elongated protruding rods 431, which are evenly distributed around the inner circumference of the metal screen frame 41. Adjacent protruding rods 431 are spaced apart, and the ends of all the protruding rods 431 are connected by protruding rings 432. The inner edge of the plastic screen 42 is fixed to the protruding rings 432. The support portion 43 of this application consists of spaced-apart protruding rods 431 with spaced-apart distances between them. This design significantly reduces the contact area between the plastic screen 42 and the support portion 43, thereby improving the screening efficiency of the plastic screen 42.

[0024] Furthermore, the height of the end of the protruding rod 431 near the protruding ring 432 is higher than the height of the end of the protruding rod 431 near the metal screen frame 41, while the plastic screen 42 extends horizontally, so that the vibration gap 44 gradually increases from the side where the protruding ring 432 is located to the side where the metal screen frame 41 is located. In this application, the height of the outer end of the protruding rod 431 is low and the height of the inner end is high. This design makes the vibration gap 44 between the plastic screen 42 and the protruding rod 431 larger on the outer side and smaller on the inner side, resulting in a large vibration amplitude on the outer side and a high vibration frequency on the inner side, which allows large particles to move from the inside to the outside, thus accelerating the screening efficiency.

[0025] Furthermore, the frame 3 includes a frame body 31 made of plastic material, with a frame support 32 made of plastic material protruding from the inner side of the frame body 31, and the frame body 31 and the frame support 32 are integrally formed. The frame 3 of this application is also made entirely of plastic material, and the frame support 32 is also made of plastic material. The combination of the plastic frame 3 and the plastic screen 42 ensures that the screened material does not come into contact with metal. The overall strength of the plastic frame 3 is insufficient, so an integrally formed frame support 32 is added to its inner side to improve strength. Therefore, this screening machine is adapted to the screening of lithium battery materials while ensuring durability. The frame support 32 includes several radially inwardly protruding pillars from the inner circumference of the frame body 31. All the pillars are spaced apart, and their ends are connected to form a closed loop.

[0026] In this embodiment, there are two frames 3, which are stacked together and locked and fixed by a retaining ring 5. The screen assemblies 4 are installed between adjacent frames 3. The outer edge of the metal screen frame 41 has a ring pressing band 45 protruding from it. The ring pressing band 45 is circumferentially engaged with the frame 3 and is locked between adjacent frames 3. The outer side of the ring pressing band 45 is wrapped with a sealing gasket 46, and when the retaining ring 5 is locked, the adjacent frames 3 squeeze the sealing gasket 46 to form a seal.

[0027] When screening cathode material powder for the lithium battery industry, after starting the equipment, the material enters the plastic screen 42 through the feeding device. The vertical vibration motor 13 drives the plastic screen 42 to vibrate, causing the material to throw. At the same time, the ultrasonic system works, and the ultrasonic power supply converts electrical energy into high-frequency electrical energy, which is then converted into high-frequency mechanical vibration through the transducer and transmitted to the plastic screen 42 through the resonant ring. Under the combined action of vibration and ultrasonic vibration, fine particles pass through the screen and are discharged from the fine material outlet 71, while coarse particles move along the screen surface and are discharged from the coarse material outlet 71. Throughout the process, the plastic screen 42 does not clog, the screening efficiency is high, and the characteristics of the cathode material are not changed, meeting the requirements of the lithium battery industry for copper and zinc content.

[0028] The following data were obtained after comparing the screening of lithium battery materials using traditional metal screening machines with that of this application:

[0029] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. At the same time, the basic principles, main features, and advantages of this utility model have been shown and described above, which should be understood by those skilled in the art.

Claims

1. An ultrasonic screening machine, comprising a vibrating base (1), wherein a frame (3) with an ultrasonic transducer (2) is mounted on the vibrating base (1), characterized in that, A screen assembly (4) is fixed on the frame (3). The screen assembly (4) includes a metal screen frame (41) and a plastic screen (42). The metal screen frame (41) has a ring structure and has an inwardly extending ring-shaped support part (43). The outer edge of the plastic screen (42) is fixed to the outside of the metal screen frame (41), and the inner edge of the plastic screen (42) is fixed to the inside of the support part (43). There is a vibration gap (44) between the plastic screen (42) and the support part (43).

2. The ultrasonic screening machine according to claim 1, characterized in that, The support part (43) includes several long strip-shaped protrusions (431). The protrusions (431) are evenly distributed on the inner circumference of the metal screen frame (41). There is a hollow space between adjacent protrusions (431). The ends of all the protrusions (431) are connected by protruding rings (432). The inner edge of the plastic screen (42) is fixed to the protruding rings (432).

3. The ultrasonic screening machine according to claim 2, characterized in that, The height of the end of the protruding rod (431) near the protruding ring (432) is higher than the height of the end of the protruding rod (431) near the metal screen frame (41), so that the vibration gap (44) gradually increases from the side where the protruding ring (432) is located to the side where the metal screen frame (41) is located.

4. An ultrasonic screening machine according to claim 1, 2, or 3, characterized in that, The frame (3) includes a frame body (31) made of plastic material, and a frame support (32) made of plastic material protrudes from the inner side of the frame body (31), and the frame body (31) and the frame support (32) are integrally formed.

5. An ultrasonic screening machine according to claim 4, characterized in that, The frame support (32) includes several radially inwardly protruding pillars from the inner periphery of the frame body (31), all of which are spaced apart and their ends are connected to each other to form a closed loop.

6. An ultrasonic screening machine according to claim 1, characterized in that, The vibration base (1) includes a mounting plate (11) and a base housing (12). A vibration motor (13) is installed inside the base housing (12). The mounting plate (11) and the base housing (12) are connected by several sets of springs (14). The upper swing block (15) and the lower swing block (16) are connected to the upper and lower parts of the vibration motor (13). When the vibration motor (13) rotates, it can drive the upper swing block (15) and the lower swing block (16) to rotate so that the mounting plate (11) vibrates. The frame (3) is installed on the mounting plate (11).

7. An ultrasonic screening machine according to claim 1, characterized in that, The frame (3) has multiple components, and adjacent frames (3) are stacked and locked together by a clamping ring (5).

8. An ultrasonic screening machine according to claim 7, characterized in that, The screen assembly (4) is installed between adjacent frames (3). The outer edge of the metal screen frame (41) has a ring pressing band (45). The ring pressing band (45) is circumferentially matched with the frame (3) and is locked between adjacent frames (3). The outer side of the ring pressing band (45) is wrapped with a sealing gasket (46). When the clamping ring (5) is locked, the adjacent frames (3) squeeze the sealing gasket (46) to form a seal.

9. An ultrasonic screening machine according to claim 1, characterized in that, This ultrasonic screening machine also includes a top frame (6) and a bottom frame (7). The bottom of the bottom frame (7) is closed and has a discharge port (71) on its side near the bottom. The bottom frame (7) is fixed on the vibrating base (1). The frames (3) are stacked and fixed on the bottom frame (7). The top frame (6) has a feeding channel (61). A feeder (8) is provided at the outlet of the feeding channel (61). The top frame (6) is fixed to the topmost frame (3).

10. An ultrasonic screening machine according to claim 9, characterized in that, The top frame (6) and each frame (3) are provided with observation windows (9).

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