A multi-layer circular vibrating screen for particle sizing

Abstract

The utility model discloses a multilayer circular vibrating screen for granularity grading relates to screening technical field. The utility model discloses a bottom plate, the upper surface annular array installation of bottom plate spring's upper end is connected with the disc collectively, the upper surface installation of disc bottom cylinder's upper end is installed with lower shell, the upper surface installation of lower shell upper surface installation is equipped with the top cylinder of upper shell, is provided with the clearing block subassembly on top cylinder, and the clearing block subassembly includes the rotating motor of installation on top cylinder upper surface, is provided with the impurity removal subassembly on the lateral wall of rotating shaft. The utility model sets up the clearing block subassembly, simplifies the operation step of clearing the blockage on big -bore filter plate and small -bore filter plate, reduces the work load of staff's cleaning blockage, reduces downtime simultaneously, speeds up screening efficiency, and sets up the impurity removal subassembly, cleans the metal impurity in petroleum coke, needle coke, pitch coke or graphite after drying, improves the purity of petroleum coke, needle coke, pitch coke or graphite after drying and screening.

Description

Technical Field

[0001] This utility model belongs to the field of screening technology, and in particular relates to a multi-layer circular vibrating screen for particle size classification. Background Technology

[0002] Petroleum coke, needle coke, pitch coke, and graphite are all carbon materials, typically characterized by high hardness and abrasiveness, and are used in industries such as lithium batteries, anode materials, and graphite electrodes. During the production of petroleum coke, needle coke, pitch coke, and graphite, these materials exist in a mixed state with varying particle sizes. Therefore, vibrating screens are used to screen them according to particle size. Multi-layer circular vibrating screens, also known as circular rotary vibrating screens or multi-layer vibrating screens, are used for screening these materials. These high-precision, high-efficiency screening devices utilize the excitation force generated by a vertical vibrating motor to move the petroleum coke, needle coke, pitch coke, or graphite on the screen, thereby achieving precise grading of the materials according to particle size.

[0003] A search revealed a circular multi-layer continuous vibrating screen in patent publication number CN220461265U, relating to the field of vibrating screen technology. It includes a screen barrel composed of multiple screen frames. An annular frame is fixed to the inner wall of each screen frame, and a screen mesh is mounted on the upper end of the annular frame. A dust cover is provided at the top of the screen barrel, with a feed inlet penetrating the center of the dust cover. A bottom barrel is connected to the bottom of the screen barrel via a damping spring. To address the drawbacks of circular vibrating screens, such as inconvenience in material collection and the inability to replace screen mesh, the screen mesh is separated from the screen frame by disassembling the retaining ring. A rotating limiting rod allows the limiting head to detach from the screen frame, facilitating the separation of the screen mesh from the screen frame. A handle allows for easy removal of the screen mesh, facilitating replacement and improving screening quality. A collection box facilitates material collection; when vibrated, the material falls directly into the collection box from the discharge port, reducing labor costs and improving convenience.

[0004] However, existing circular multi-layer continuous vibrating screens still have the following shortcomings in practical use: 1. First, the screen barrel consists of multiple screen frames. A discharge port extends through the side of each screen frame, and a collection box is located directly below the discharge port. A ring frame is fixed to the inner wall of each screen frame, and a screen mesh is installed on the upper part of the ring frame. Different screen meshes have different mesh sizes. A bottom barrel is connected to the bottom of the screen barrel via shock-absorbing springs. A vibrating motor is built into the bottom barrel and connected to the bottom of the screen barrel via a fixed frame. Material enters the screen barrel through the feed inlet. The vibrating motor is activated, generating vibration. This vibration is transmitted to the screen barrel through the fixed frame, and then to the screen mesh inside the screen barrel. The material falls onto the screen mesh for continuous vibrating screening. Different screens correspond to different discharge ports. After screening, the material continues to be vibrated and shaken off from the discharge port. The shaken material falls directly into the collection box below due to gravity. However, during the screening process, some material with a particle size similar to the screen mesh will get stuck inside the mesh, forming a blockage. This will reduce the screening efficiency. It is necessary to disassemble the screen frame and screen in sequence, clean the blockage on the screen, and then reassemble the screen frame and screen. This process is cumbersome, increases the workload of the staff, prolongs the downtime, and reduces the screening efficiency. 2. Secondly, during the screening process of materials (dried petroleum coke, needle coke, pitch coke, or graphite), the sieve can only screen the materials according to their particle size. However, the presence of metal impurities (iron filings) in the materials (dried petroleum coke, needle coke, pitch coke, or graphite) makes it difficult to remove the metal impurities (iron filings) by relying solely on the sieve. This makes it difficult to reduce the metal impurities (iron filings) in the materials (dried petroleum coke, needle coke, pitch coke, or graphite) and reduce the purity of the materials (dried petroleum coke, needle coke, pitch coke, or graphite) after screening.

[0005] To address these issues, we provide a multi-layer circular vibrating screen for particle size classification. Utility Model Content

[0006] The purpose of this invention is to provide a multi-layer circular vibrating screen for particle size classification. By setting up a clogging removal component, the operation steps for cleaning blockages on large-pore and small-pore filter plates are simplified, reducing workload and downtime, and accelerating the screening efficiency of dried petroleum coke, needle coke, pitch coke, or graphite. Furthermore, by setting up an impurity removal component, metallic impurities in dried petroleum coke, needle coke, pitch coke, or graphite are removed, increasing the purity of the dried petroleum coke, needle coke, pitch coke, or graphite after screening, thereby solving the technical problems mentioned in the background art.

[0007] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution: This utility model relates to a multi-layer circular vibrating screen for particle size classification, comprising a base plate, on which springs arranged in a ring array on the upper surface of the base plate are connected to a disc at their upper ends. A lower outer shell is mounted on the upper end of a bottom cylinder mounted on the upper surface of the disc. A top cylinder is mounted on the upper surface of the upper outer shell. A blockage-clearing assembly is provided on the top cylinder. The blockage-clearing assembly includes a rotating motor mounted on the upper surface of the top cylinder. The lower end of a rotating shaft connected to the output end of the rotating motor penetrates the top cylinder. Cleaning brushes are equidistantly mounted on the circumferential sidewall of the rotating shaft. A debris removal assembly is provided on the sidewall of the rotating shaft. The debris removal assembly includes supports equidistantly mounted on the sidewall of the rotating shaft. A strip plate is connected to the lower edge of the sidewall of a connecting plate mounted on the upper surface of the support. Magnet rods are connected in a rectangular array on the upper surface of the strip plate. Reinforcing plates symmetrically fixed to the lower surface of the strip plate are mounted on the sidewall of the support.

[0008] The present invention is further configured such that the lower surface of the base plate is provided with a ring array of support legs, and the lower end of the support legs is fixedly connected with an anti-slip seat.

[0009] The present invention is further configured such that a drive motor is installed on the lower surface of the base plate, a drive shaft connected to the output end of the drive motor passes through the disk, an eccentric wheel is installed on the upper end of the drive shaft, an annular seat is fixedly connected to the center position of the lower surface of the disk, and the outer wall of the eccentric wheel abuts against the inner wall of the annular seat.

[0010] The present invention is further configured such that a feed hopper is connected and fixed to the upper surface of the top cylinder, and a discharge hopper is connected and fixed to the outer walls of the bottom cylinder, the lower outer shell, and the upper outer shell.

[0011] The present invention is further configured such that a perforated filter plate is installed on the upper surface of the support ring fixed to the lower inner periphery of the lower outer shell, a handle is symmetrically fixed to the upper surface of the perforated filter plate, a cleaning rod installed on the upper surface of the perforated filter plate has an inverted L-shaped structure, and the rotating shaft and the perforated filter plate are rotatably connected.

[0012] The present invention is further configured such that a large-pore filter plate is installed on the upper surface of the support ring fixed to the lower inner circumference of the upper shell, a handle is symmetrically fixed to the upper surface of the large-pore filter plate, a cleaning rod is installed on the upper surface of the large-pore filter plate, and the rotating shaft and the large-pore filter plate are rotatably connected.

[0013] The present invention is further configured such that the upper surface of the support is provided with an internally threaded through hole, and a bolt is threadedly connected inside the internally threaded through hole, the upper end of the bolt being threadedly connected to the lower surface of the connecting plate.

[0014] The present invention is further configured such that a slotted plate is fixedly connected to the upper surface of the support, and the connecting plate is slidably connected inside the slotted plate. The slotted plate has a T-shaped groove structure in cross section, and the connecting plate has a T-shaped structure.

[0015] This utility model has the following beneficial effects: 1. This utility model, by setting up a blockage-clearing component, rotates the motor when it is powered on, causing the rotating shaft to rotate and driving the cleaning brush to rotate. The rotating cleaning brush cleans the dried petroleum coke, needle coke, pitch coke, or graphite that is blocked on the large-pore filter plate. At the same time, the rotating cleaning brush cleans the dried petroleum coke, needle coke, pitch coke, or graphite that is blocked on the small-pore filter plate. This ensures the screening efficiency of the large-pore and small-pore filter plates for dried petroleum coke, needle coke, pitch coke, or graphite. Moreover, it eliminates the need to disassemble the top cylinder, upper shell, and lower shell in sequence, thereby simplifying the operation steps for cleaning blockages on the large-pore and small-pore filter plates, reducing the workload of the workers, and helping to reduce downtime and accelerate the screening efficiency of dried petroleum coke, needle coke, pitch coke, or graphite.

[0016] 2. By setting up a cleanup component, the metal impurities in the dried petroleum coke, needle coke, pitch coke, or graphite that enter the top cylinder, upper outer shell, lower outer shell, and bottom cylinder are adsorbed onto the magnetic rod, effectively reducing the content of metal impurities (iron filings) in the dried petroleum coke, needle coke, pitch coke, or graphite, and increasing the purity of the dried petroleum coke, needle coke, pitch coke, or graphite after sieving. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0018] Figure 1 A three-dimensional schematic diagram of a multi-layer circular vibrating screen for particle size classification. Figure 1 ; Figure 2 A three-dimensional schematic diagram of a multi-layer circular vibrating screen for particle size classification. Figure 2 ; Figure 3 This is a schematic cross-sectional view of a multi-layer circular vibrating screen used for particle size classification. Figure 4 A schematic diagram showing the connection between the unblocking component and the impurity removal component; Figure 5 This is a schematic diagram of the impurity removal component.

[0019] The attached diagram lists the components represented by each number as follows: 1-Base plate, 101-Disc, 101a-Annular seat, 102-Bottom cylinder, 103-Lower outer shell, 104-Upper outer shell, 105-Top cylinder, 105a-Feed hopper, 106-Support leg, 106a-Anti-slip seat, 107-Discharge hopper, 108-Spring, 109-Drive motor, 109a-Drive shaft, 109b-Eccentric wheel, 110-Support ring, 2-Unblocking assembly 201-Rotating motor, 201a-Rotating shaft, 202-Large hole filter plate, 203-Small hole filter plate, 204-Cleaning rod, 205-Cleaning brush, 206-Handle, 3-Impurity removal assembly, 301-Slot plate, 302-Strip plate, 303-Magnetic rod, 304-Connecting plate, 304a-Bolt, 305-Reinforcing plate, 306-Support, 306a-Internal threaded through hole. Detailed Implementation

[0020] 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 skilled in the art without creative effort are within the protection scope of the present utility model.

[0021] Example 1 Please see Figure 1 and Figure 2 This utility model is a multi-layer circular vibrating screen for particle size classification, including a bottom plate 1, an annular seat 101a, a feed hopper 105a, a discharge hopper 107, a spring 108, a drive motor 109, a drive shaft 109a, and an eccentric wheel 109b. When the drive motor 109 is energized, it drives the eccentric wheel 109b to rotate, which in turn pushes the annular seat 101a to move. Since the bottom plate 1 and the disc 101 are connected by the spring 108, the bottom cylinder 102, the lower outer shell 103, the upper outer shell 104, and the top cylinder 105 shake, thereby realizing the shaking screening of dried petroleum coke, needle coke, pitch coke, or graphite. Specifically, the upper ends of the springs 108, which are mounted in a ring array on the upper surface of the base plate 1, are connected to a disc 101. The upper end of the bottom cylinder 102 mounted on the upper surface of the disc 101 is fitted with a lower outer shell 103. The upper surface of the upper outer shell 104 mounted on the upper surface of the lower outer shell 103 is fitted with a top cylinder 105. Furthermore, the lower surface of the base plate 1 is equipped with a ring array of support legs 106, creating a space between the base plate 1 and the ground, which facilitates the disassembly and maintenance of the drive motor 109. The lower end of the support legs 106 is fixedly connected to an anti-slip seat 106a. The lower surface of the base plate 1 is equipped with a drive motor 109. The drive shaft 109a connected to the output end of the drive motor 109 passes through the disc 101. The upper end of the drive shaft 109a is equipped with an eccentric wheel 109b. An annular seat 101a is fixedly connected to the center of the lower surface of the disc 101. The outer wall of the eccentric wheel 109b abuts against the inner wall of the annular seat 101a. The upper surface of the top cylinder 105 is connected to and fixedly connected to a feed hopper 105a. The outer walls of the bottom cylinder 102, the lower outer shell 103, and the upper outer shell 104 are all connected to and fixedly connected to a discharge hopper 107. The operation process of this embodiment is as follows: The drive motor 109 is energized, the drive shaft 109a rotates, driving the eccentric wheel 109b to rotate. Since the spring 108 connects the base plate 1 and the disc 101, the eccentric wheel 109b pushes the annular seat 101a to move during rotation, causing the disc 101 to move with the annular seat 101a. This causes the bottom cylinder 102, lower outer shell 103, upper outer shell 104, and top cylinder 105 to shake. The operator then feeds the dried petroleum coke, needle coke, pitch coke, or graphite into the feed hopper 105a. Inside the feed hopper 105a, the dried petroleum coke, needle coke, pitch coke, or graphite, relying on their own weight, flows from top to bottom... The particles of dried petroleum coke, needle coke, pitch coke, or graphite that fall through the top cylinder 105, upper outer shell 104, and lower outer shell 103 fall into the bottom cylinder 102 and are filtered by the large-pore filter plate 202 and the small-pore filter plate 203. The large-particle-size dried petroleum coke, needle coke, pitch coke, or graphite that are trapped on the large-pore filter plate 202 are discharged through the discharge hopper 107 on the upper outer shell 104. The medium-particle-size dried petroleum coke, needle coke, pitch coke, or graphite that are trapped on the small-pore filter plate 203 are discharged through the discharge hopper 107 on the lower outer shell 103. The small-particle-size dried petroleum coke, needle coke, pitch coke, or graphite that fall to the bottom of the bottom cylinder 102 are discharged through the discharge hopper 107 on the bottom cylinder 102.

[0022] Example 2 Please see Figure 1 , Figure 3 and Figure 4Based on the first specific embodiment, a blockage removal component 2 is provided. The blockage removal component 2 includes a rotating motor 201, a rotating shaft 201a, and a cleaning brush 205. When the rotating motor 201 is energized, it drives the cleaning brush 205 to rotate, cleaning the dried petroleum coke, needle coke, pitch coke, or graphite that is blocked on the large-pore filter plate 202 and the small-pore filter plate 203. This ensures the screening efficiency of the large-pore filter plate 202 and the small-pore filter plate 203 for dried petroleum coke, needle coke, pitch coke, or graphite without disassembling the lower outer shell 103, the upper outer shell 104, and the top cylinder 105. This simplifies the steps of cleaning the blocked dried petroleum coke, needle coke, pitch coke, or graphite, reduces workload, reduces downtime, and helps to accelerate the screening efficiency of dried petroleum coke, needle coke, pitch coke, or graphite. Specifically, the rotating motor 201 is installed on the upper surface of the top cylinder 105, and the lower end of the rotating shaft 201a connected to the output end of the rotating motor 201 passes through the top cylinder 105. Cleaning brushes 205 are installed at equal intervals on the peripheral sidewall of the rotating shaft 201a. Furthermore, a perforated filter plate 203 is mounted on the upper surface of a support ring 110 fixed to the lower inner circumference of the lower outer shell 103. The support ring 110 is fixed in position, limiting the position of the perforated filter plate 203, allowing for more stable screening of dried petroleum coke, needle coke, pitch coke, or graphite. A handle 206 is symmetrically fixed to the upper surface of the perforated filter plate 203. A cleaning rod 204 mounted on the upper surface of the perforated filter plate 203 has an inverted L-shaped structure. The rotating shaft 201a and the perforated filter plate 203... 3. Rotary connection: A large-pore filter plate 202 is installed on the upper surface of a support ring 110 fixed to the lower inner circumference of the upper outer shell 104. The position of the support ring 110 is fixed, which limits the position of the large-pore filter plate 202, so as to screen the dried petroleum coke, needle coke, pitch coke or graphite more stably. A handle 206 is symmetrically fixed to the upper surface of the large-pore filter plate 202. A cleaning rod 204 is installed on the upper surface of the large-pore filter plate 202. The rotating shaft 201a is rotatably connected to the large-pore filter plate 202. The operation process of this embodiment is as follows: The rotating motor 201 is energized, driving the rotating shaft 201a to rotate, causing the cleaning brush 205 to rotate. The rotating cleaning brush 205 cleans the dried petroleum coke, needle coke, pitch coke, or graphite clogging the large-pore filter plate 202, ensuring the screening effect of the large-pore filter plate 202 on the dried petroleum coke, needle coke, pitch coke, or graphite. Simultaneously, the rotating cleaning brush 205 cleans the dried petroleum coke, needle coke, pitch coke, or graphite clogging the small-pore filter plate 203, ensuring the screening effect of the small-pore filter plate 203 on the dried petroleum coke, needle coke, pitch coke, or graphite. During the rotation of the cleaning brush 205 along with the rotating shaft 201a, the bristles on the cleaning brush 205 will... When the cleaning rod 204 contacts the filter plate 202 and the filter plate 203, which are fixedly connected to the large-pore filter plate 202 and the small-pore filter plate 203, and both the large-pore filter plate 202 and the small-pore filter plate 203 are rotatably connected to the rotating shaft 201a, the large-pore filter plate 202, the small-pore filter plate 203 and the cleaning rod 204 do not rotate with the rotating shaft 201a. This causes the bristles on the cleaning brush 205 to contact the cleaning rod 204, and the cleaning rod 204 applies external force to the bristles on the cleaning brush 205, causing the dried petroleum coke, needle coke, pitch coke or graphite residue remaining on the cleaning brush 205 to fall off. This ensures that the cleaning brush 205 fully cleans the dried petroleum coke, needle coke, pitch coke or graphite clogging the large-pore filter plate 202 and the small-pore filter plate 203.

[0023] Example 3 Please see Figure 3 , Figure 4 and Figure 5 Based on specific embodiments one and two, a cleaning component 3 is provided. The cleaning component 3 includes a strip plate 302, a magnetic rod 303, a connecting plate 304, a reinforcing plate 305, and a support 306. The magnetic rod 303 cleans the metal impurities (iron filings) in the dried petroleum coke, needle coke, pitch coke, or graphite, which is beneficial to improving the purity of the dried petroleum coke, needle coke, pitch coke, or graphite after screening. Specifically, the support 306 is equidistantly installed on the side wall of the rotating shaft 201a. The lower edge of the side wall of the connecting plate 304 installed on the upper surface of the support 306 is connected to a strip plate 302. The upper surface of the strip plate 302 is connected to a rectangular array of magnet rods 303. The lower surface of the strip plate 302 is symmetrically fixed to a reinforcing plate 305 installed on the side wall of the support 306. Furthermore, the upper surface of the support 306 is provided with an internally threaded through hole 306a, and a bolt 304a is threadedly connected inside the internally threaded through hole 306a. The upper end of the bolt 304a is threadedly connected to the lower surface of the connecting plate 304, so that the support 306 and the connecting plate 304 are detachably connected, thereby facilitating the removal and cleaning of metal impurities (iron filings) on the magnet rod 303. A slot plate 301 is fixedly connected to the upper surface of the support 306, and the connecting plate 304 is slidably connected inside the slot plate 301. The cross-section of the slot plate 301 is a T-slot structure, and the connecting plate 304 is a T-structure, which limits the position of the connecting plate 304, improves the stability of the connecting plate 304 after installation, and makes the magnet rod 303 clean metal impurities (iron filings) more smoothly. The operation process of this embodiment is as follows: Metal impurities in the dried petroleum coke, needle coke, pitch coke, or graphite entering the top cylinder 105 are adsorbed onto the magnetic rod 303. Similarly, metal impurities in the dried petroleum coke, needle coke, pitch coke, or graphite passing through the large-pore filter plate 202 are adsorbed onto the magnetic rod 303. The same applies to the small-pore filter plate 203, achieving multiple cleaning of the metal impurities. When it is necessary to clean the metal impurities on the magnetic rod 303, the top cylinder 105, upper outer shell 104, and lower outer shell 103 are disassembled in sequence. Then, the bolt 304a is rotated clockwise, causing it to rotate clockwise. Simultaneously, the bolt 304a moves downwards until it completely detaches from the connecting plate 304, releasing the connection to the connecting plate 304. To fix the position of the magnet rod 303, pull the connecting plate 304 upwards. The connecting plate 304 moves upwards along the slot plate 301, and the strip plate 302 and the magnet rod 303 move upwards with the connecting plate 304 until the connecting plate 304 is completely separated from the slot plate 301. Separate the connecting plate 304 and the rotating shaft 201a, and clean the metal impurities on the magnet rod 303. After cleaning the metal impurities on the magnet rod 303, place the connecting plate 304 above the slot plate 301 and press the connecting plate 304 downwards. The connecting plate 304 moves downwards into the interior of the slot plate 301, and the strip plate 302 and the magnet rod 303 move downwards with the connecting plate 304 until the connecting plate 304 abuts against the support 306. Rotate the bolt 304a counterclockwise until the bolt 304a is threadedly connected to the connecting plate 304, thus fixing the position of the magnet rod 303.

[0024] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

Claims

1. A multi-layer circular vibrating screen for particle size classification, comprising a base plate (1), wherein the upper ends of springs (108) arranged in a ring array on the upper surface of the base plate (1) are connected to a disc (101), a lower outer shell (103) is mounted on the upper end of a bottom cylinder (102) mounted on the upper surface of the disc (101), and a top cylinder (105) is mounted on the upper surface of an upper outer shell (104) mounted on the upper surface of the lower outer shell (103), characterized in that: The top cylinder (105) is provided with a blockage removal component (2), which includes a rotating motor (201) installed on the upper surface of the top cylinder (105). The lower end of the rotating shaft (201a) connected to the output end of the rotating motor (201) passes through the top cylinder (105). Cleaning brushes (205) are installed at equal intervals on the peripheral sidewall of the rotating shaft (201a). A cleaning component (3) is provided on the side wall of the rotating shaft (201a). The cleaning component (3) includes a support (306) equidistantly installed on the side wall of the rotating shaft (201a). A strip plate (302) is connected to the lower edge of the side wall of the connecting plate (304) installed on the upper surface of the support (306). A magnetic rod (303) is connected to the upper surface of the strip plate (302) in a rectangular array. A reinforcing plate (305) symmetrically fixed to the lower surface of the strip plate (302) is installed on the side wall of the support (306).

2. The multi-layer circular vibrating screen for particle size classification according to claim 1, characterized in that: The lower surface of the base plate (1) is provided with a ring array of support legs (106), and the lower end of the support legs (106) is fixed with an anti-slip seat (106a).

3. A multi-layer circular vibrating screen for particle size classification according to claim 2, characterized in that: A drive motor (109) is installed on the lower surface of the base plate (1). The drive shaft (109a) connected to the output end of the drive motor (109) passes through the disk (101). An eccentric wheel (109b) is installed on the upper end of the drive shaft (109a). An annular seat (101a) is fixed at the center of the lower surface of the disk (101). The outer wall of the eccentric wheel (109b) abuts against the inner wall of the annular seat (101a).

4. A multi-layer circular vibrating screen for particle size classification according to claim 1, characterized in that: The upper surface of the top cylinder (105) is connected to and fixedly connected to a feed hopper (105a), and the outer walls of the bottom cylinder (102), the lower outer shell (103) and the upper outer shell (104) are all connected to and fixedly connected to a discharge hopper (107).

5. A multi-layer circular vibrating screen for particle size classification according to claim 1, characterized in that: A perforated filter plate (203) is mounted on the upper surface of a support ring (110) fixed to the lower inner periphery of the lower outer shell (103). A handle (206) is symmetrically fixed to the upper surface of the perforated filter plate (203). A cleaning rod (204) mounted on the upper surface of the perforated filter plate (203) has an inverted L-shaped structure. The rotating shaft (201a) and the perforated filter plate (203) are rotatably connected.

6. A multi-layer circular vibrating screen for particle size classification according to claim 1, characterized in that: A large-pore filter plate (202) is installed on the upper surface of the support ring (110) fixed to the lower inner periphery of the upper outer shell (104). A handle (206) is symmetrically fixed to the upper surface of the large-pore filter plate (202). A cleaning rod (204) is installed on the upper surface of the large-pore filter plate (202). The rotating shaft (201a) and the large-pore filter plate (202) are rotatably connected.

7. A multi-layer circular vibrating screen for particle size classification according to claim 1, characterized in that: The upper surface of the support (306) is provided with an internal threaded through hole (306a), and a bolt (304a) is threadedly connected inside the internal threaded through hole (306a). The upper end of the bolt (304a) is threadedly connected to the lower surface of the connecting plate (304).

8. A multi-layer circular vibrating screen for particle size classification according to claim 7, characterized in that: The upper surface of the support (306) is fixedly connected to a slot plate (301), and the connecting plate (304) is slidably connected inside the slot plate (301). The slot plate (301) has a T-shaped groove structure in cross section, and the connecting plate (304) has a T-shaped structure.

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