A four-deck spin screen

Abstract

The present application relates to the technical field of rotary vibration screen, and particularly relates to a four-layer rotary vibration screen. The rotary vibration screen comprises a screen body suspended in a steel frame, one end of the top of the screen body is provided with a feeding port, an internal inclined screen structure is provided, the screen structure comprises an upper layer bottom plate and a lower layer bottom plate, a first screen assembly arranged above the upper layer bottom plate and a second screen assembly arranged above the lower layer bottom plate; the first screen assembly comprises one layer of screen frame and two layers of screen frame arranged from top to bottom; the second screen assembly comprises three layers of screen frame and four layers of screen frame arranged from top to bottom; one end of the screen body is provided with a large impurity outlet, a fine impurity outlet and a material outlet, one end of the upper layer bottom plate away from the large impurity outlet is provided with a partition plate extending upward to the feeding port; a material distribution device is connected with the feeding port in a flexible manner, the material distribution device comprises a first outlet and a second outlet; a driving device is connected with the screen body. The present application effectively solves the technical problem of the limited screen separation capacity of the rotary vibration screen in the prior art, which leads to the low screen separation efficiency.

Description

Technical Field

[0001] This invention relates to the field of rotary vibrating screen technology, and more particularly to a four-layer rotary vibrating screen. Background Technology

[0002] A vibrating screen is a device that uses a combination of rotation and vibration to screen materials. It utilizes a motor-driven vibrator to generate high-speed rotational force, which is converted into a combined excitation force in three directions: horizontal, vertical, and inclined. This creates a complex three-dimensional motion trajectory on the screen surface, enhancing the material's ability to pass through and promoting uniform distribution on the screen, thus achieving efficient and precise screening. However, existing vibrating screens can only perform single-pass screening and cannot quickly screen materials that require multiple screenings.

[0003] Regarding the above issues, the authorization announcement number is CN218835221. U's patent document discloses a novel high-yield rotary vibrating screen. This screen has five screens arranged sequentially from bottom to top on a vibrating support: screen five, screen four, screen three, screen two, and screen one. Screen meshes are placed between adjacent screens, with the upper two meshes having identical mesh openings and the lower two meshes having identical mesh openings. Screen one has an oversize outlet four on its right side and a guide pipe three extending to screen two. Screen two has an undersize outlet three on its left side and a guide pipe two extending to screen three. Screen three has an oversize outlet two on its right side and a guide pipe one connected to screen four, and an undersize outlet two on its left side, which connects downwards to undersize outlet one. Material passes through the four screens sequentially from top to bottom within the rotary vibrating screen, separating the oversize and undersize materials for discharge. This allows for multiple screenings of materials of two specifications using a single rotary vibrating screen, improving material screening efficiency.

[0004] As can be seen, in actual use, the above-mentioned vibrating screen performs multiple screenings of materials entering the screen from top to bottom, using two different specifications. Although it can speed up the screening efficiency of materials that require multiple screenings to a certain extent, the amount of material it can accommodate and screen in one screening process is limited by the size of the screen grid and screen mesh, resulting in a limited screening capacity per screening and low screening efficiency. To increase the screening capacity per screening, the area of ​​the screen grid and screen mesh needs to be increased, or multiple vibrating screens need to be connected in parallel. However, increasing the area of ​​the screen grid and screen mesh or connecting multiple vibrating screens in parallel will result in a large space occupation, leading to low space utilization in the production workshop or factory and failing to meet the needs of some high-end users. Summary of the Invention

[0005] This invention provides a four-layer vibrating screen to solve the technical problem that the limited screening capacity of existing vibrating screens leads to low screening efficiency.

[0006] To solve the above problems, the four-layer vibrating screen provided by the present invention adopts the following technical solution:

[0007] A four-layer vibrating screen, comprising:

[0008] The screen body is suspended in a steel frame. A feed inlet is provided at one end of the top of the screen body. The screen body has an inclined screening structure inside. The screening structure includes an upper bottom plate and a lower bottom plate that are parallel to each other, as well as a first screening component located above the upper bottom plate and a second screening component located above the lower bottom plate. The upper bottom plate and the lower bottom plate divide the internal space of the screen body into an upper screening section and a lower screening section. The length of the upper bottom plate is less than the length of the lower bottom plate and its end away from the feed inlet abuts against the inner wall of the screen body. Both ends of the lower bottom plate abut against the inner wall of the screen body. The upper bottom plate has a partition plate that extends upward to the feed inlet at the end facing the feed inlet. The partition plate is used to separate the first screening component and the second screening component, and at the same time, it plays a sealing role by pressing against the end of the first screening component.

[0009] The first screening component includes a first layer of screen frames and a second layer of screen frames arranged from top to bottom;

[0010] The second screening component includes three-layer and four-layer screen frames arranged from top to bottom. The screen aperture size of the three-layer screen frames is the same as that of the first-layer screen frame, and the screen aperture size of the fourth-layer screen frame is the same as that of the second-layer screen frame but smaller than that of the first-layer screen frame.

[0011] One end of the screen body is provided with a large impurity outlet connected to the first-layer screen frame and the third-layer screen frame, a fine impurity outlet connected to the upper bottom plate and the lower bottom plate, and a material discharge port connected to the second-layer screen frame and the fourth-layer screen frame;

[0012] The material distribution device is flexibly connected to the feed inlet. The material distribution device includes a first discharge port leading to the upper screening section and a second discharge port leading to the lower screening section.

[0013] A drive device is connected to the screen body, which is suspended from the steel frame. The drive device is used to drive the screen body to vibrate.

[0014] The beneficial effects of the four-layer rotary vibrating screen provided by this invention are:

[0015] 1. By setting an upper bottom plate and a lower bottom plate, the internal space of the screen body is divided into an upper screening section and a lower screening section. A first screening component and a second screening component with the same screen hole specification are set in the upper screening section and the lower screening section respectively. A partition plate extending upward to the feed inlet is set at the end of the upper bottom plate facing the feed inlet. A material distribution device is set at the feed inlet of the screen body, so that the material flowing through the feed inlet can be distributed, so that part of it enters the upper screening section and the other part enters the lower screening section. This makes the upper screening section and the lower screening section form two separate screen frame structures, achieving the effect of integrating two ordinary rotary vibrating screens together, increasing the screening volume of the rotary vibrating screen, thereby improving the screening efficiency of the rotary vibrating screen.

[0016] 2. By setting up a first screening component and a second screening component, which include two screen frames with decreasing screen aperture sizes from top to bottom, two specifications of screening can be performed on the materials entering the upper screening section and the lower screening section in one screening process, ensuring the screening efficiency of the vibrating screen for materials that need to be screened multiple times.

[0017] 3. The upper and lower screening sections are set from top to bottom, without increasing the area of ​​the screen frame. Thus, the screening efficiency can be doubled with the same screen frame area and floor space as ordinary vibrating screens.

[0018] 4. The feed inlet is connected to the distribution device with a flexible connection, which can effectively prevent material splashing and dust overflow during feeding.

[0019] In summary, the present invention effectively solves the technical problem of low screening efficiency caused by the limited screening capacity of the existing vibrating screen.

[0020] Furthermore, a material distribution buffer hopper is provided above the material distribution device. Multiple inclined material distribution plates are arranged alternately from top to bottom inside the material distribution buffer hopper. The material distribution plates are detachably connected to the material distribution buffer hopper. A buffer hopper air intake is provided on the side of the material distribution buffer hopper.

[0021] Beneficial effects: The air intake of the buffer bucket can initially remove some lightweight impurities through air separation, thus improving the impurity removal effect of the vibrating screen.

[0022] Furthermore, the material leveling plate includes, from top to bottom, a first material leveling plate, a second material leveling plate, a third material leveling plate, and a fourth material leveling plate. The first and second material leveling plates both extend downward and pass through the vertical central axis of the material leveling buffer hopper. The ends of the first and second material leveling plates are provided with serrated protrusions, and the serrated protrusions on the first and second material leveling plates are staggered and correspond to each other. The ends of the third and fourth material leveling plates are both provided with constricted sections, and the third and fourth material leveling plates are symmetrical about the vertical central axis of the material leveling buffer hopper.

[0023] Beneficial effects: The ends of the first and second uniform material plates located at the top of the uniform material buffer hopper are provided with serrated protrusions, which can increase the path of material flowing through the ends of the first and second uniform material plates, making it easier for the material flowing through the first and second uniform material plates to be fully spread out at this point; the ends of the third and fourth uniform material plates are provided with constriction sections, which can make the material fall vertically in a waterfall shape after being spread flat on the third and fourth uniform material plates, thereby enabling the material to pass through the screen frame quickly and improving the screening efficiency.

[0024] Furthermore, the side wall of the uniform material buffer hopper is provided with a diamond-shaped mesh air inlet.

[0025] Furthermore, the material distribution device includes a main body, and a material distribution plate is provided at the lower end of the main body. The two ends of the material distribution plate are connected to the main body through a front shaft and a rear shaft, respectively. The front shaft of the material distribution plate is connected to a locking handle and an adjusting handle for adjusting the tilt angle of the material distribution plate, thereby controlling the uniformity of material entering the first and third sieve frames.

[0026] Furthermore, a scale indicator is provided on the outer wall of the main body of the device.

[0027] Furthermore, the driving device includes a drive motor, the output end of which is provided with a drive pulley, the screen body is provided with a transmission shaft, the transmission shaft is equipped with a driven pulley and an eccentric counterweight, and the drive pulley and the driven pulley are connected by a belt.

[0028] Furthermore, the drive motor is fixed to the screen body via a motor mounting bracket.

[0029] Furthermore, the material outlet is connected to a vertical suction duct or a circulating air separator.

[0030] Beneficial effects: Vertical suction ducts or circulating air separators can serve as secondary air separation mechanisms to quickly remove fine impurities and dust mixed in with materials, further improving the screening effect of the vibrating screen.

[0031] Furthermore, the screen body is also equipped with a self-cleaning device, which is connected to a programmable logic controller (PLC) to clean the screen surfaces of the first-layer screen frame and the third-layer screen frame under the control of the PLC, thereby reducing manual cleaning costs. Attached Figure Description

[0032] The above and other objects, features, and advantages of exemplary embodiments of the present invention will become readily apparent upon reading the following detailed description with reference to the accompanying drawings. In the drawings, several embodiments of the invention are illustrated by way of example and not limitation, and like or corresponding reference numerals denote like or corresponding parts, wherein:

[0033] Figure 1 Schematic diagram of the structure of the four-layer vibrating screen provided by the present invention Figure 1 ;

[0034] Figure 2 Schematic diagram of the structure of the four-layer vibrating screen provided by the present invention Figure 2 ;

[0035] Figure 3 Schematic diagram of the structure of the four-layer vibrating screen provided by the present invention Figure 3 ;

[0036] Figure 4 This is a top view of the four-layer rotary vibrating screen provided by the present invention;

[0037] Figure 5 A schematic diagram of the drive device provided by the present invention;

[0038] Figure 6 This is a schematic diagram of the material dispensing device provided by the present invention;

[0039] Figure 7 This is a schematic diagram of the connection structure between the uniform buffer hopper and the material distribution device provided by the present invention.

[0040] Figure 8 This is a schematic diagram of the structure of the end of the first uniform material plate provided by the present invention;

[0041] Figure 9 This is a schematic diagram of the structure of the end of the second uniform plate provided by the present invention.

[0042] Explanation of reference numerals in the attached figures:

[0043] 1. Screen body; 2. Steel frame; 3. Upper bottom plate; 4. Lower bottom plate; 5. Divider plate; 6. First layer screen frame; 7. Second layer screen frame; 8. Third layer screen frame; 9. Fourth layer screen frame; 10. Large impurity outlet; 11. Fine impurity outlet; 12. Material discharge port; 13. First discharge port; 14. Second discharge port; 15. Buffer hopper; 16. First equalization plate; 17. Second equalization plate; 18. Third equalization plate; 19. Fourth equalization plate; 20. Buffer hopper air inlet; 21. Serrated protrusion; 22. Vertical section; 3. Inclined section; 24. Diamond mesh air inlet; 25. Material distribution plate; 26. Front shaft of material distribution plate; 27. Rear shaft of material distribution plate; 28. Locking handle; 29. ​​Material distribution plate adjusting handle; 30. Scale indicator; 31. Drive motor; 32. Drive pulley; 33. Transmission shaft; 34. Driven pulley; 35. Eccentric counterweight; 36. Belt; 37. Motor mounting base; 38. Vertical suction duct; 39. Cleaning motor; 40. Belt tension adjusting screw; 41. Flange; 42. Hinge; 43. Inspection cover. Detailed Implementation

[0044] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Those skilled in the art should understand that the embodiments described below are only some, not all, of the embodiments disclosed. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0045] It should be noted that the main concept of the four-layer vibrating screen provided by the present invention is as follows: the internal space of the screen body is separated by an upper bottom plate and a lower bottom plate to form an upper screening section and a lower screening section. A first screening component and a second screening component with the same screen aperture specification are set in the upper screening section and the lower screening section. A material distribution device is set at the feed inlet of the screen body. The material distribution device has a first discharge port leading to the upper screening section and a second discharge port leading to the lower screening section, so as to evenly distribute the material entering the feed inlet to the upper screening section and the lower screening section. The material is screened simultaneously by the first screening component and the second screening component to increase the instantaneous screening capacity of the vibrating screen, thereby improving its screening efficiency.

[0046] After introducing the basic principles of the present invention, various non-limiting embodiments of the present invention are described in detail below. Any number of elements in the accompanying drawings is for illustrative purposes only and not for limitation, and any naming is for distinction only and has no limiting meaning.

[0047] The principles and spirit of the present invention will be explained in detail below with reference to several representative embodiments.

[0048] Example 1 of the four-layer vibrating screen provided by the present invention:

[0049] like Figures 1 to 9 As shown, the four-layer vibrating screen includes a steel frame 2, on which a screen body 1 is suspended by a universal joint. A feed inlet is provided at one end of the top of the screen body 1. The feed inlet is connected to a uniform buffer hopper 15 through a material distribution device. The screen body 1 is connected to a drive device. The steel frame 2 is a steel frame.

[0050] Regarding the screen body 1: The screen body 1 is suspended on the steel frame 2. Its interior is inclined and equipped with a screening structure, which includes an upper bottom plate 3 and a lower bottom plate 4 that are parallel to each other, as well as a first screening component located above the upper bottom plate 3 and a second screening component located above the lower bottom plate 4. The upper bottom plate 3 and the lower bottom plate 4 divide the internal space of the screen body 1 into an upper screening section and a lower screening section.

[0051] Specifically, the length of the upper bottom plate 3 is less than the length of the lower bottom plate 4 and one end of the upper bottom plate 3 abuts against the inner wall of the screen body 1, while both ends of the lower bottom plate 4 abut against the inner wall of the screen body 1.

[0052] Specifically, the first screening component includes a first-layer screen frame 6 and a second-layer screen frame 7 arranged from top to bottom, and the second screening component includes a third-layer screen frame 8 and a fourth-layer screen frame 9 arranged from top to bottom. The third-layer screen frame 8 has the same screen aperture size as the first-layer screen frame 6, and the fourth-layer screen frame 9 has the same screen aperture size as the second-layer screen frame 7 but smaller than the screen aperture size of the first-layer screen frame 6.

[0053] Specifically, one end of the screen body 1 is provided with a large impurity outlet 10, a fine impurity outlet 11, and a material discharge port 12. The large impurity outlet 10 is connected to the first-layer screen frame 6 and the third-layer screen frame 8. The fine impurity outlet 11 is connected to the upper bottom plate 3 and the lower bottom plate 4. The material discharge port 12 is connected to the second-layer screen frame 7 and the fourth-layer screen frame 9. The upper bottom plate 3 is provided with a partition plate 5 extending upward to the feed inlet at the end away from the large impurity outlet 10. The large impurity outlet 10 is used to discharge large-diameter materials, and the fine impurity outlet 11 is used to discharge small-diameter materials. The partition plate 5 is used to separate the first screening component and the second screening component, and at the same time plays a sealing role by pressing against the ends of the first-layer screen frame 6 and the second-layer screen frame 7.

[0054] Regarding the material distribution device: The material distribution device includes a main body, and a material distribution plate 25 is provided at the lower end of the main body. The material distribution plate 25 is used to divide the material outlet 12 of the main body into a first outlet 13 leading to the upper screening section and a second outlet 14 leading to the lower screening section. The two ends of the material distribution plate 25 are connected to the main body through a front shaft 26 and a rear shaft 27, respectively. A locking handle 28 is connected to the front shaft 26, and a material distribution plate adjustment handle 29 is connected to the locking handle 28. The material distribution plate adjustment handle 29 is used to adjust the inclination angle of the material distribution plate 25 to control the uniformity of material entering the first-layer screen frame 6 and the third-layer screen frame 8. A scale indicator 30 is also provided on the outer wall of the main body to display the inclination angle of the material distribution plate 25.

[0055] Specifically, a flexible connection is used between the material distribution device and the feed inlet to effectively prevent material splashing and dust overflow during feeding.

[0056] Regarding the material leveling buffer hopper 15: The bottom of the material leveling buffer hopper 15 is connected to the top of the material distribution device. The material leveling buffer hopper 15 includes a rectangular section and a conical section arranged from top to bottom. Inside the material leveling buffer hopper 15, a first material leveling plate 16, a second material leveling plate 17, a third material leveling plate 18, and a fourth material leveling plate 19 are arranged alternately from top to bottom. The first material leveling plate 16 and the second material leveling plate 17 both extend downward and pass through the vertical central axis of the material leveling buffer hopper 15. The ends of the first material leveling plate 16 and the second material leveling plate 17 are provided with serrated protrusions 21, and the serrated protrusions 21 on the first material leveling plate 16 and the second material leveling plate 17 are staggered to fully spread the material entering the material leveling buffer hopper 15. The ends of the third material leveling plate 18 and the fourth material leveling plate 19 are provided with constriction sections, and the third material leveling plate 18 and the fourth material leveling plate 19 are symmetrical about the vertical central axis of the material leveling buffer hopper 15 so that the material is spread out again and falls in a waterfall shape.

[0057] Specifically, the closing section includes a vertical section 22 and an inclined section 23 connected to the vertical section 22.

[0058] Specifically, the material equalization buffer hopper 15 is provided with a buffer hopper air inlet 20 on one side and a diamond mesh air inlet 24 on the other side. The diamond mesh air inlet 24 is used for preliminary air separation to remove some light impurities.

[0059] Specifically, the first uniform material plate 16, the second uniform material plate 17, the third uniform material plate 18 and the fourth uniform material plate 19 are all detachably connected to the uniform material buffer hopper 15.

[0060] Regarding the drive unit: The drive unit includes a drive motor 31 fixed to the screen body 1 via a motor mounting base 37. The output end of the drive motor 31 is connected to a drive pulley 32. The screen body 1 is provided with a transmission shaft 33. A driven pulley 34 and an eccentric counterweight 35 are mounted on the transmission shaft 33. The drive pulley 32 and the driven pulley 34 are connected by a belt 36. The drive motor 31 drives the drive pulley 32 to rotate, thereby driving the driven pulley 34 to rotate, which in turn drives the transmission shaft 33 to rotate. The rotation of the transmission shaft 33 drives the eccentric counterweight 35 to rotate at high speed. The centrifugal force of the eccentric counterweight 35 drives the entire screen body 1 to rotate.

[0061] In addition, the material outlet 12 is also connected to a vertical suction duct 38, which can serve as a secondary air separation mechanism to remove fine impurities and dust mixed in the material, maximizing the cleaning effect. The screen body 1 is also equipped with two self-cleaning devices, each of which includes a cleaning motor 39. Both self-cleaning devices are connected to a programmable logic controller (not shown in the figure) to clean the screen surfaces of the first-layer screen frame 6 and the third-layer screen frame 8 under the control of the programmable logic controller, reducing manual cleaning costs. The motor mounting base 37 is also equipped with a belt tension adjusting screw 40 to adjust the tension of the belt 36. The top cover of the material equalization buffer hopper 15 is divided into three sections, with a flange 41 reserved in the middle section for connection to the discharge chute on site. Both sides of the flange 41 are connected to inspection covers 43 via hinges 42, allowing for quick maintenance by flipping and opening the inspection covers 43.

[0062] The working principle of the four-layer vibrating screen provided by this invention is as follows: The material first enters the uniform buffer hopper 15, and after passing through the first uniform plate 16, the second uniform plate 17, the third uniform plate 18 and the fourth uniform plate 19, it enters the distribution device. The tilt angle of the distribution plate 25 is adjusted by the distribution plate adjustment handle 29 so that the material enters the first layer screen frame 6 and the third layer screen frame 8 evenly. The material on the first layer screen frame 6 and the third layer screen frame 8 is discharged from the large impurity outlet 10 into the vertical suction channel 38. The material under the screen falls into the second layer screen frame 7 and the fourth layer screen frame 9 respectively. The material under the screen of the second layer screen frame 7 and the fourth layer screen frame 9 falls onto the upper bottom plate 3 and the lower bottom plate 4 respectively, and is guided to the fine impurity outlet 11 for discharge through the upper bottom plate 3 and the lower bottom plate 4. The material on the screen enters the vertical suction channel 38 from the material outlet 12. The vertical suction channel 38 sucks out the fine impurities and dust in the material on the screen, so that clean material can be obtained.

[0063] Example 2 of the four-layer vibrating screen provided by the present invention:

[0064] Its main difference from Example 1 is:

[0065] In Example 1, the material outlet is connected to a vertical suction duct.

[0066] In this embodiment, a circulating air separator is connected to the material outlet.

[0067] Example 3 of the four-layer vibrating screen provided by the present invention:

[0068] Its main difference from Example 1 is:

[0069] In Example 1, the sieve body is equipped with two self-cleaning devices.

[0070] In this embodiment, the sieve body is either not equipped with a self-cleaning device or is equipped with a self-cleaning device.

[0071] Based on the above description in this specification, those skilled in the art will also understand that the following terms, such as "upper," "lower," "front," "rear," "left," "right," "width," "horizontal," "top," "bottom," "inner," and "outer," which indicate orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings of this specification. They are only for the purpose of facilitating the explanation of the present invention and simplifying the description, and do not explicitly or implicitly suggest that the device or element involved must have the specific orientation, or be constructed and operated in a specific orientation. Therefore, the above-mentioned orientation or positional relationship terms should not be understood or interpreted as limitations on the present invention.

[0072] In addition, in the description of this specification, "multiple" means at least two, such as two, three or more, etc., unless otherwise expressly and specifically defined.

Claims

1. A four-layer rotary vibrating screen, characterized in that, include: The screen body is suspended in a steel frame. A feed inlet is provided at one end of the top of the screen body. The screen body has an inclined screening structure inside. The screening structure includes an upper bottom plate and a lower bottom plate that are parallel to each other, as well as a first screening component located above the upper bottom plate and a second screening component located above the lower bottom plate. The upper bottom plate and the lower bottom plate divide the internal space of the screen body into an upper screening section and a lower screening section. The length of the upper bottom plate is less than the length of the lower bottom plate and its end away from the feed inlet abuts against the inner wall of the screen body. Both ends of the lower bottom plate abut against the inner wall of the screen body. The upper bottom plate has a partition plate that extends upward to the feed inlet at the end facing the feed inlet. The partition plate is used to separate the first screening component and the second screening component, and at the same time, it plays a sealing role by pressing against the end of the first screening component. The first screening component includes a first layer of screen frames and a second layer of screen frames arranged from top to bottom; The second screening component includes three-layer and four-layer screen frames arranged from top to bottom. The screen aperture size of the three-layer screen frames is the same as that of the first-layer screen frame, and the screen aperture size of the fourth-layer screen frame is the same as that of the second-layer screen frame but smaller than that of the first-layer screen frame. One end of the screen body is provided with a large impurity outlet connected to the first-layer screen frame and the third-layer screen frame, a fine impurity outlet connected to the upper bottom plate and the lower bottom plate, and a material discharge port connected to the second-layer screen frame and the fourth-layer screen frame; The material distribution device is flexibly connected to the feed inlet. The material distribution device includes a first discharge port leading to the upper screening section and a second discharge port leading to the lower screening section. A drive device is connected to the screen body, which is suspended from the steel frame. The drive device is used to drive the screen body to vibrate. Above the material distribution device is a material equalization buffer hopper. Inside the material equalization buffer hopper, multiple inclined material equalization plates are arranged alternately from top to bottom. The material equalization plates are detachably connected to the material equalization buffer hopper. The side of the material equalization buffer hopper is provided with a buffer hopper air inlet. The material leveling plate includes a first material leveling plate, a second material leveling plate, a third material leveling plate, and a fourth material leveling plate from top to bottom. The first and second material leveling plates both extend downward and pass through the vertical central axis of the material leveling buffer hopper. The ends of the first and second material leveling plates are provided with serrated protrusions, and the serrated protrusions on the first and second material leveling plates are staggered and correspond to each other. The ends of the third and fourth material leveling plates are provided with constricted sections, and the third and fourth material leveling plates are symmetrical about the vertical central axis of the material leveling buffer hopper. The material distribution device includes a main body, and a material distribution plate is provided at the lower end of the main body. The two ends of the material distribution plate are connected to the main body through a front shaft and a rear shaft, respectively. The front shaft of the material distribution plate is connected to a locking handle and a material distribution plate adjusting handle to adjust the tilt angle of the material distribution plate, thereby controlling the uniformity of material entering the first-layer screen frame and the third-layer screen frame. The outer wall of the main body of the device is equipped with a scale indicator.

2. The four-layer vibrating screen according to claim 1, characterized in that, The side wall of the uniform material buffer hopper is provided with a diamond-shaped mesh air inlet.

3. The four-layer vibrating screen according to claim 1 or 2, characterized in that, The driving device includes a drive motor, the output end of which is provided with a drive pulley. The screen body is provided with a transmission shaft, on which a driven pulley and an eccentric counterweight are mounted. The drive pulley and the driven pulley are connected by a belt.

4. The four-layer vibrating screen according to claim 3, characterized in that, The drive motor is fixed to the screen body by a motor mounting bracket.

5. The four-layer vibrating screen according to claim 1 or 2, characterized in that, The material outlet is connected to a vertical suction duct or a circulating air separator.

6. The four-layer vibrating screen according to claim 1 or 2, characterized in that, The screen body is also equipped with a self-cleaning device, which is connected to a programmable logic controller (PLC) to clean the screen surfaces of the first and third screen frames under the control of the PLC, thereby reducing manual cleaning costs.

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