A pelletizing device for a composite getter material

Abstract

The utility model discloses a kind of cutting granulator of composite getter material, it is related to composite getter material technical field, specifically a kind of cutting granulator of composite getter material, including device ontology, the inside of device ontology is equipped with first empty slot, the top of first empty slot is equipped with granulating port, the inside of granulating port is equipped with cutting blade for composite getter material cutting granule, screening structure for layer-by-layer screening after composite getter material cutting granule is provided in first empty slot;By driving assembly, first screening layer and second screening layer can be pushed left and right to shake, the material after being cut can be screened, and the debris screen can be removed to the third screening layer, and then the material of each layer is extracted by the object receiving box, the cleaning device is driven to slide up and down on the inner wall of the inlet by the lifting device, the inner wall dust can be removed during sliding process, to prevent the inlet from being blocked and affecting use, and the cleaning sleeve can be disassembled by screw and nut.

Description

Technical Field

[0001] This utility model relates to the field of composite air-absorbing material technology, specifically a pelletizing device for composite air-absorbing materials. Background Technology

[0002] Maintaining gas purity and low-pressure environments within closed systems is crucial in modern industry, scientific research, and daily life, leading to the development of composite getter materials. These materials effectively adsorb specific gas molecules and are widely used in scenarios such as obtaining and maintaining vacuum and purifying gases, significantly improving the performance and extending the lifespan of electro-vacuum devices. Composite getter materials combine the characteristics of both evaporative and non-evaporative getter materials. In evaporative getters, the getter material evaporates from the carrier and condenses into a mirror-like surface upon contact with the cold tube wall, absorbing gas through both evaporative and mirror-like absorption. In the production process of composite getter materials, the pelletizing device plays a key role. It cuts the formed composite getter material into uniform granules, ensuring good flowability and dispersibility in subsequent use, improving the consistency of material performance, and simultaneously increasing production efficiency and automation.

[0003] However, current pelletizing devices for composite air-absorbing materials on the market produce materials of varying sizes. These cut materials are mixed together and require manual sieving after cutting, which wastes time. Furthermore, the scraps can be reused, but current cutting devices do not collect them uniformly, resulting in material waste and low work efficiency. The dust generated during the cutting of composite air-absorbing materials accumulates at the feed inlet, and if not cleaned for a long time, it will gradually block the feed inlet and affect normal use. Therefore, we have proposed a pelletizing device for composite air-absorbing materials. Utility Model Content

[0004] This invention provides a pelletizing device for composite air-absorbing materials, which solves the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A pelletizing device for composite air-absorbing material includes a device body, a first slot is provided inside the device body, a pelletizing port is installed at the top of the first slot, a cutting blade for pelletizing composite air-absorbing material is installed inside the pelletizing port, and a sieving structure for screening the composite air-absorbing material layer by layer after pelletizing is provided in the first slot.

[0007] The screening structure includes a first screening layer, a second screening layer, and a third screening layer. Multiple movable connecting blocks are installed on the top of the first empty trough. Multiple first connecting rods are rotatably connected to the outside of the movable connecting blocks. A first screening layer that can swing left and right is rotatably connected to the bottom of the first connecting rods. A second screening layer that can swing left and right is rotatably connected to the bottom of the first screening layer. A driving component that allows the first and second screening layers to swing left and right is also installed on the outside of the second screening layer. A third screening layer for carrying composite air-absorbing material debris is installed at the bottom of the second screening layer.

[0008] The top of the device body is equipped with an inlet for inserting composite aspirating material, and a cleaning device for cleaning is installed inside the inlet. The top of the device body is also equipped with a lifting device for moving the cleaning component up and down.

[0009] Preferably, the movable connecting block is rotatably connected to a plurality of first connecting rods, the bottom of each of the first connecting rods being rotatably connected to the outer wall of the first screening layer, and the first screening layer having a first sliding groove inside, with a first screen plate slidably connected within the first sliding groove.

[0010] Preferably, the drive assembly includes a second motor, a square rotating block, and a third connecting rod;

[0011] The outer wall of the first screening layer is rotatably connected to multiple second connecting rods, the bottom of which is rotatably connected to the outer wall of the second screening layer. A second sliding groove is formed inside the second screening layer, and a second sieve plate is slidably connected within the second sliding groove.

[0012] A second motor is installed on one side of the top of the second screening layer. A square rotating block is installed at the end of the output shaft of the second motor. A third connecting rod is rotatably connected to the outside of the square rotating block. The square rotating block drives the third connecting rod to rotate off-center. The third connecting rod is movably connected to both sides of the outside of the first screening layer.

[0013] Preferably, a plurality of square rods are fixedly connected to the top of the first empty slot, a third screening layer is installed at the bottom of the square rods, a first sliding groove is opened inside the third screening layer, and a container for assembling composite air-absorbing material debris is slidably connected in the first sliding groove.

[0014] Preferably, the lifting device includes a moving block, a moving plate, a second sliding groove, a threaded rod, and a first motor;

[0015] A movable block is mounted on the top of the device body. A second sliding groove is formed inside the movable block, and a movable plate is slidably connected within the second sliding groove. A threaded rod is rotatably connected to the top of the device body, and the threaded rod is threadedly connected to the movable plate. The movable plate can move up and down within the second sliding groove via the threaded connection with the threaded rod. The top of the threaded rod is connected to the end of the output shaft of the first motor. A third sliding groove is formed on the side of the feed inlet near the movable block. The movable plate passes through the movable block and the third sliding groove to reach the feed inlet.

[0016] Preferably, the pelletizing port is positioned to correspond to the feed port, a connecting plate is installed at the bottom of the inner wall of the pelletizing port, and a cutting blade is rotatably connected to the top of the connecting plate.

[0017] Preferably, the cleaning device includes a cleaning sleeve, a cylindrical connecting rod, a screw, and a nut;

[0018] A nut is fitted onto the outer end of the movable plate that extends into the feed inlet. A screw passes through the movable plate and the nut and is threadedly connected to the cylindrical connecting rod. A cleaning sleeve is installed on the end of the nut away from the movable block. The cleaning sleeve can move up and down with the movable plate on the inner wall of the feed inlet.

[0019] Preferably, the cleaning sleeve can contact the inner wall of the feed inlet, the opening size of the second screening layer is larger than that of the first screening layer, the opening size of the third screening layer is larger than that of the second screening layer, and the moving plate is T-shaped.

[0020] This utility model has the following beneficial effects:

[0021] 1. This pelletizing device for composite air-absorbing material can drive the first and second screening layers to sway left and right through a drive component, which can screen the cut material. The first screen plate inside the first screening layer can retain larger materials as it sways, while the rest are screened to the second screening layer. The second screen plate inside the second screening layer can remove debris as it sways and send it to the third screening layer. The material from each layer is then extracted through a receiving box. In this way, composite air-absorbing materials of different sizes can be separated after cutting, and the generated debris can be collected, recycled, and reused, improving work efficiency and saving material resources.

[0022] 2. The pelletizing device for composite air-absorbing material uses a lifting device to drive the cleaning device to slide up and down on the inner wall of the inlet. The cleaning sleeve contacts the inner wall of the inlet, and the dust on the inner wall can be removed during the sliding process. The cleaning sleeve can be disassembled and replaced with screws and nuts, thereby cleaning the debris in the inlet and preventing the inlet from being blocked and affecting the use. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of this utility model;

[0024] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0025] Figure 3 This is a schematic diagram of another inclined plane of the present invention;

[0026] Figure 4 This is an enlarged structural schematic diagram of point A of this utility model;

[0027] Figure 5 This is a schematic diagram of the inclined plane structure of this utility model;

[0028] Figure 6 This is a schematic diagram of the top structure of the present invention;

[0029] Figure 7 This is a schematic diagram of the top cross-section of the present invention.

[0030] In the diagram: 1. Device body; 101. Lifting device; 102. Cleaning device; 103. Screening structure; 2. First empty trough; 3. Movable connecting block; 4. First connecting rod; 5. First screening layer; 6. Second connecting rod; 7. Second screening layer; 8. Third screening layer; 9. Pelletizing port; 10. First sliding groove; 11. Receiver box; 12. First sieve plate; 13. Second sieve plate; 14. Feed inlet; 15. Moving block; 16. Moving plate; 17. Second sliding groove; 18. Threaded rod; 19. First motor; 20. Third sliding groove; 21. Connecting plate; 22. Cutting blade; 23. Cleaning sleeve; 24. Cylindrical connecting rod; 25. Screw; 26. Nut; 31. Second motor; 32. Square rotating block; 33. Third connecting rod. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. 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.

[0032] Please see Figures 1 to 7A pelletizing device for composite air-absorbing material includes a device body 1. The device body 1 has a first empty groove 2 inside. A pelletizing port 9 is installed at the top of the first empty groove 2. A cutting blade 22 for pelletizing the composite air-absorbing material is installed inside the pelletizing port 9. The device is characterized in that: a sieve structure 103 is provided in the first empty groove 2 to screen the pelletized composite air-absorbing material layer by layer. The material enters the device through the feed port 14, is pelletized by the cutting blade 22 inside the pelletizing port 9, and the pelletized material enters the sieve structure 103. The sieve structure 103 can be shaken and screened to separate and collect materials and debris of different sizes, thereby improving work efficiency.

[0033] The screening structure 103 includes a first screening layer 5, a second screening layer 7, and a third screening layer 8. Multiple movable connecting blocks 3 are installed on the top of the first empty trough 2. Multiple first connecting rods 4 are rotatably connected to the outside of each movable connecting block 3. The bottom of each first connecting rod 4 is rotatably connected to the first screening layer 5, which can swing left and right. The bottom of the first screening layer 5 is rotatably connected to the second screening layer 7, which can swing left and right. A driving component is also installed on the outside of the second screening layer 7 to allow the first and second screening layers 5 to swing left and right. The bottom of the second screening layer 7 is equipped with a third screening layer 8 for carrying composite air-absorbing material debris. Under the driving force of the driving component, the first and second screening layers 5 and 7 can swing left and right. The material coming out of the pelletizing port 9 passes through the first screening layer 5. The first screening layer 5 removes larger materials, while the rest enters the second screening layer 7. The second screening layer 7 can screen out debris into the third screening layer 8. This allows for rapid screening and collection of materials and debris of different sizes after cutting.

[0034] The top of the device body 1 is equipped with an inlet 14 for inserting composite aspirating material. Inside the inlet 14 is a cleaning device 102 for cleaning. The top of the device body 1 is also equipped with a lifting device 101 for moving the cleaning component up and down. The material can enter the device through the inlet 14. After being granulated by the cutting blade 22, the dust generated will accumulate on the inner wall of the inlet 14. The lifting device 101 can drive the cleaning component to slide up and down on the inner wall of the inlet 14 to clean the inlet 14 and prevent blockage from affecting the use of the device.

[0035] Please see Figures 1 to 2The movable connecting block 3 is rotatably connected to a plurality of first connecting rods 4. The bottom of each of the first connecting rods 4 is rotatably connected to the outer wall of the first screening layer 5. The first screening layer 5 has a first sliding groove inside, and a first screen plate 12 is slidably connected in the first sliding groove. After the material is granulated by the cutting blade 22, it passes to the first screening layer 5. The first screening layer 5 shakes left and right when the second motor 31 is started, which drives the first screen plate 12 inside to shake. The first screen plate 12 can retain the larger materials after cutting, and the rest passes through the first screen plate 12 to the second screening layer 7. The first screen plate 12 can be removed through the first sliding groove, and the collected larger materials can be taken out and cut again.

[0036] Please see Figures 1 to 3 The drive assembly includes a second motor 31, a square rotating block 32, and a third connecting rod 33;

[0037] Multiple second connecting rods 6 are rotatably connected to the outer wall of the first screening layer 5. The bottom of each of the second connecting rods 6 is rotatably connected to the outer wall of the second screening layer 7. A second sliding groove is formed inside the second screening layer 7, and a second screen plate 13 is slidably connected within the second sliding groove. Material passes through the first screen plate 12 to the second screening layer 7. Under the driving force of the second motor 31, the second screening layer 7 sways left and right. The holes of the second screen plate 13 inside the second screening layer 7 are small, which can screen out debris and pass it to the third screening layer 8, leaving normal-sized material. The second screen plate 13 can be removed through the second sliding groove.

[0038] A second motor 31 is installed on one side of the top of the second screening layer 7. A square rotating block 32 is installed at the end of the output shaft of the second motor 31. A third connecting rod 33 is rotatably connected to the outside of the square rotating block 32. The square rotating block 32 drives the third connecting rod 33 to rotate off-center. The third connecting rod 33 is movably connected to both sides of the outside of the first screening layer 5. Driven by the second motor 31, the square rotating block 32 drives the third connecting rod 33 to rotate. The third connecting rod 33 pushes the first screening layer 5 to shake. At the same time, it also pushes the second screening layer 7 synchronously, so that the first screening layer 5 and the second screening layer 7 shake left and right, and screen materials of different sizes after cutting.

[0039] Please see Figures 1 to 5The top of the first empty slot 2 is fixedly connected with multiple square rods, and the bottom of the square rods is equipped with a third screening layer 8. The interior of the third screening layer 8 is provided with a first sliding groove 10. A receiving box 11 for assembling composite air-absorbing material debris is slidably connected in the first sliding groove 10. The third screening layer 8 is located at the bottom of the second screening layer 7. By shaking the second screening layer 7, the second sieve plate 13 can sieve the debris and pass it into the third screening layer 8. The receiving box 11 can be pulled by the first sliding groove 10 to collect the reusable material debris.

[0040] Please see Figures 1 to 4 The lifting device 101 includes a moving block 15, a moving plate 16, a second sliding groove 17, a threaded rod 18, and a first motor 19;

[0041] A movable block 15 is installed on the top of the device body 1. A second sliding groove 17 is opened inside the movable block 15. A movable plate 16 is slidably connected in the second sliding groove 17. A threaded rod 18 is rotatably connected to the top of the device body 1. The threaded rod 18 is threadedly connected to the movable plate 16. The movable plate 16 can move up and down in the second sliding groove 17 through the threaded connection with the threaded rod 18. The top of the threaded rod 18 is connected to the end of the output shaft of the first motor 19. A third sliding groove 20 is opened on the side of the inlet 14 near the movable block 15. The movable plate 16 passes through the movable block 15 and the third sliding groove 20 to reach the inlet 14. Driven by the first motor 19, the threaded rod 18 is rotated, causing the movable plate 16 to slide up and down in the second sliding groove 17. The movable plate 16 can simultaneously drive the cleaning device 102 to slide up and down in the inner wall of the inlet 14, thereby cleaning the dust accumulated in the inner wall of the inlet 14 and preventing the inlet 14 from being blocked and affecting the use of the device.

[0042] Please see Figures 1 to 6 The position of the pelletizing port 9 corresponds to that of the feed port 14. A connecting plate 21 is installed at the bottom of the inner wall of the pelletizing port 9. A cutting blade 22 is rotatably connected to the top of the connecting plate 21. The material enters from the feed port 14 and is pelletized by the cutting blade 22 in the pelletizing port 9. Then it is passed into the first screening layer 5 to start screening of materials and debris of different sizes.

[0043] Please see Figures 1 to 7 The cleaning device 102 includes a cleaning sleeve 23, a cylindrical connecting rod 24, a screw 25, and a nut 26;

[0044] A nut 26 is sleeved on the outside of one end of the movable plate 16 that extends into the feed inlet 14. A screw 25 passes through the movable plate 16 and the nut 26 and is threadedly connected to the cylindrical connecting rod 24. A cleaning sleeve 23 is installed on the end of the nut 26 away from the movable block 15. The cleaning sleeve 23 can move up and down with the movable plate 16 on the inner wall of the feed inlet 14. Driven by the first motor 19, the movable plate 16 drives the cylindrical connecting rod 24 to move up and down. The cylindrical connecting rod 24 drives the cleaning sleeve 23 to slide up and down on the inner wall of the feed inlet 14. This can clean the dust accumulated on the inner wall of the feed inlet 14 and prevent blockage from affecting use. Then, the cleaning sleeve 23 can be removed and replaced by rotating the nut 26.

[0045] Please see Figures 1 to 5 The cleaning sleeve 23 can contact the inner wall of the feed inlet 14. The opening size of the second screening layer 7 is larger than that of the first screening layer 5, and the opening size of the third screening layer 8 is larger than that of the second screening layer 7. The moving plate 16 is T-shaped. The cleaning sleeve 23 contacts the inner wall of the feed inlet 14, which can effectively clean the dust on the inner wall of the feed inlet 14. The opening size of the second screening layer 7 is larger than that of the first screening layer 5, and the opening size of the third screening layer 8 is larger than that of the second screening layer 7, which can prevent the material after cutting from splashing out.

[0046] In summary, this composite air-absorbing material pelletizing device, when in use, firstly, the material is put in through the feed inlet 14, and the cutting blade 22 is started to rotate and cut the material. At the same time, the second motor 31 is started, which drives the square rotating block 32 to start rotating. The square rotating block 32 drives the third connecting rod 33 to rotate off-center, causing the first screening layer 5 to sway left and right. While the first screening layer 5 is swaying, the second screening layer 7 is also swaying left and right synchronously. The first screen plate 12 located inside the first screening layer 5 can screen out the larger pieces of material, and the rest is screened into the second screening layer 7. The second screen plate 13 inside the second screening layer 7 can remove the debris to the third screen. Inside layer 8, pull the receiving box 11 to remove the debris, thus completing the screening of materials of different sizes and collecting reusable debris, improving work efficiency. Next, start the first motor 19, which drives the threaded rod 18 to rotate. The threaded rod 18 drives the moving plate 16 to slide up and down in the second sliding groove 17. The moving plate 16 drives the cleaning sleeve 23 to slide up and down on the inner wall of the feed inlet 14. The cleaning sleeve 23 contacts the inner wall of the feed inlet 14, which can clean the dust on the inner wall of the feed inlet 14 and prevent dust from accumulating and blocking the feed inlet 14, affecting its use. Then, the cleaning sleeve 23 can be removed and replaced by rotating the cylindrical connecting rod 24.

[0047] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and 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, and therefore should not be construed as a limitation of this utility model; the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In addition, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances. Moreover, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0048] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pelletizing device for composite air-absorbing material, comprising a device body (1), wherein a first slot (2) is provided inside the device body (1), a pelletizing port (9) is installed at the top of the first slot (2), and a cutting blade (22) for pelletizing composite air-absorbing material is installed inside the pelletizing port (9), characterized in that: The first empty trough (2) is provided with a sieve structure (103) for screening the composite air-absorbing material layer by layer after it is granulated; The screening structure (103) includes a first screening layer (5), a second screening layer (7), and a third screening layer (8). Multiple movable connecting blocks (3) are installed on the top of the first empty slot (2). Multiple first connecting rods (4) are rotatably connected to the outside of the movable connecting blocks (3). The bottom of the first connecting rods (4) is rotatably connected to the first screening layer (5) which can swing left and right. The bottom of the first screening layer (5) is rotatably connected to the second screening layer (7) which can swing left and right. The outside of the second screening layer (7) is also equipped with a driving component that allows the first screening layer (5) and the second screening layer (7) to swing left and right. The bottom of the second screening layer (7) is equipped with a third screening layer (8) for carrying composite air-absorbing material debris. The top of the device body (1) is equipped with an inlet (14) for inserting composite aspirating material. A cleaning device (102) for cleaning is installed inside the inlet (14). The top of the device body (1) is also equipped with a lifting device (101) for moving the cleaning component up and down.

2. The pelletizing device for a composite air-absorbing material according to claim 1, characterized in that: The movable connecting block (3) is rotatably connected to a plurality of first connecting rods (4), the bottom of each of the first connecting rods (4) is rotatably connected to the outer wall of the first screening layer (5), and a first sliding groove is provided inside the first screening layer (5), and a first sieve plate (12) is slidably connected in the first sliding groove.

3. The pelletizing device for a composite air-absorbing material according to claim 2, characterized in that: The drive assembly includes a second motor (31), a square rotating block (32), and a third connecting rod (33); The outer wall of the first screening layer (5) is rotatably connected to a plurality of second connecting rods (6), the bottom of each of the second connecting rods (6) being rotatably connected to the outer wall of the second screening layer (7). The interior of the second screening layer (7) is provided with a second sliding groove, and a second sieve plate (13) is slidably connected within the second sliding groove. A second motor (31) is installed on one side of the top of the second screening layer (7). A square rotating block (32) is installed at the end of the output shaft of the second motor (31). A third connecting rod (33) is rotatably connected to the outside of the square rotating block (32). The square rotating block (32) drives the third connecting rod (33) to rotate off-center. The third connecting rod (33) is movably connected to both sides of the outside of the first screening layer (5).

4. The pelletizing device for a composite air-absorbing material according to claim 3, characterized in that: The top of the first empty slot (2) is fixedly connected with a plurality of square rods, and the bottom of the square rods is equipped with a third screening layer (8). The interior of the third screening layer (8) is provided with a first sliding groove (10), and a container (11) for assembling composite air-absorbing material debris is slidably connected in the first sliding groove (10).

5. The pelletizing device for a composite air-absorbing material according to claim 4, characterized in that: The lifting device (101) includes a moving block (15), a moving plate (16), a second sliding groove (17), a threaded rod (18), and a first motor (19); A movable block (15) is installed on the top of the device body (1). A second sliding groove (17) is provided inside the movable block (15). A movable plate (16) is slidably connected in the second sliding groove (17). A threaded rod (18) is rotatably connected to the top of the device body (1). The threaded rod (18) is threadedly connected to the movable plate (16). The movable plate (16) can move up and down in the second sliding groove (17) through the threaded connection with the threaded rod (18). The top of the threaded rod (18) is connected to the end of the output shaft of the first motor (19). A third sliding groove (20) is provided on the side of the feed inlet (14) near the movable block (15). The movable plate (16) passes through the movable block (15) and the third sliding groove (20) to reach the feed inlet (14).

6. The pelletizing device for a composite air-absorbing material according to claim 5, characterized in that: The position of the pelletizing port (9) corresponds to the feed port (14). A connecting plate (21) is installed at the bottom of the inner wall of the pelletizing port (9), and a cutting blade (22) is rotatably connected to the top of the connecting plate (21).

7. The pelletizing device for a composite air-absorbing material according to claim 6, characterized in that: The cleaning device (102) includes a cleaning sleeve (23), a cylindrical connecting rod (24), a screw (25), and a nut (26); The movable plate (16) extends into the feed inlet (14) and is fitted with a nut (26). The screw (25) passes through the movable plate (16) and the nut (26) and is threadedly connected to the cylindrical connecting rod (24). A cleaning sleeve (23) is installed on the end of the nut (26) away from the movable block (15). The cleaning sleeve (23) can move up and down along the inner wall of the feed inlet (14) with the movable plate (16).

8. The pelletizing device for a composite air-absorbing material according to claim 7, characterized in that: The cleaning sleeve (23) can contact the inner wall of the feed inlet (14), the opening size of the second screening layer (7) is larger than that of the first screening layer (5), the opening size of the third screening layer (8) is larger than that of the second screening layer (7), and the moving plate (16) is T-shaped.

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