Anion material screening device based on air purification and screening method thereof

Abstract

The invention relates to the technical field of negative ion materials, and provides a negative ion material screening device based on air purification and a screening method thereof. And a roller screen is installed at the top of the interior of the shell, a small-hole screen frame is installed at the bottom of a middle-hole screen frame, and vibration mechanisms are arranged at the bottoms of the small-hole screen frame and a collecting frame. Through multi-stage screening, large particles which obviously exceed the standard are intercepted by the roller screen through gaps between parallel rotating rollers and are prevented from entering a follow-up precise screen to cause blockage, particles with larger particle sizes are separated by the mesoporous screen frame through high-frequency vibration, and meanwhile, falling of qualified particles is accelerated through an oblique vibration track; the small-hole screen frame also separates the negative ion material in the target particle size range through high-frequency vibration, ultrafine particles easy to agglomerate or coarse particles low in activity are removed, the particle size uniformity of the material is ensured, and the negative ion release efficiency of the material, the equipment reliability and the production benefit are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of negative ion materials, and particularly relates to a screening device and a screening method for negative ion materials for air purification. Background Art

[0002] Negative ion materials for air purification are functional materials that have received much attention in the fields of environmental protection and health in recent years. Their core value lies in achieving the dual effects of air purification and health care by releasing negative ions. The screening device for negative ion materials for air purification is a precision device designed for separating, purifying, and grading negative ion functional materials, such as tourmaline powder, rare earth composite minerals, nano-level negative ion additives, etc., to separate particles in different particle size ranges and meet the requirements of the specific surface area and adsorption efficiency of the materials for air purifiers. The existing technical solutions mentioned above have the following defects: When screening materials, it is impossible to perform gradient separation for particles of different particle sizes. When treating large particles and small particles simultaneously, it is easy to have problems such as large particles impacting the sieve mesh and causing blockage, and small particles being difficult to be efficiently separated, resulting in poor particle size consistency of the materials and being difficult to meet the requirements of the particle size concentration of air purification materials, affecting the negative ion release efficiency of the materials. Summary of the Invention

[0003] The purpose of the present invention is to provide a screening device and a screening method for negative ion materials for air purification to solve the defect of low separation efficiency of the existing screening device for negative ion materials for air purification.

[0004] To solve the above technical problems, the present invention provides the following technical solutions: A screening device and a screening method for negative ion materials for air purification, including a housing and a mesoporous sieve frame installed inside it; a roller sieve is installed at the top inside the housing, a small-hole sieve frame is installed at the bottom of the mesoporous sieve frame, and vibration mechanisms are provided at the bottoms of both the small-hole sieve frame and the collection frame; the vibration mechanism includes a support shaft installed on one side of the bottoms of the small-hole sieve frame and the mesoporous sieve frame, and connecting rods are hinged at both ends of the support shaft. A connecting shaft is installed on the inner wall of the housing at the end of the connecting rod away from the support shaft. Connecting blocks are provided at both ends of the mesoporous sieve frame and the small-hole sieve frame, and elastic components are installed on the inner wall of the housing on one side of the connecting block.

[0005] Preferably, a feed port is provided on one side of the top of the housing, a door body is installed on one side of the housing, and a discharge port is provided at the bottom of the housing.

[0006] Preferably, eccentric wheels are installed at both ends of the connecting shaft, and one end of the eccentric wheel is connected to the connecting rod. A first servo motor is installed at one end of the connecting shaft.

[0007] Preferably, a limiting shaft penetrates through the inside of the connecting block, and a torsion block is fixed on one side of the limiting shaft, and clamping blocks are welded to both ends of the other side of the limiting shaft.

[0008] Preferably, an activity groove is arranged in the connecting block outside the limiting shaft, a spring is sleeved on one side of the limiting shaft, and a clamping groove is arranged at the top of the elastic component outside the clamping block.

[0009] Preferably, collection grooves are arranged at the bottoms of the medium-hole sieve frame and the small-hole sieve frame, and the medium-hole sieve frame and the small-hole sieve frame are in a slightly inclined state. A collection frame is installed at the bottom of one side of the medium-hole sieve frame, and a collection frame is installed at the bottom of the small-hole sieve frame. The collection grooves gather the falling negative ion materials towards the middle, ensuring that the materials stably fall into the sieve frame and avoiding slipping from the edge gaps.

[0010] Preferably, a plurality of groups of roller screens are provided, and a collection frame is installed at the bottom of one side of the roller screen. A baffle is arranged on the inner wall of the outer shell at the bottom of the roller screen. The roller screen includes a sieve shaft installed inside the outer shell, and a second servo motor is installed at one end of each sieve shaft.

[0011] Preferably, a connecting disk is sleeved outside the sieve shaft, and a roller disk is sleeved outside the sieve shaft between the connecting disks. The connecting disks and the roller disks are evenly distributed on the surface of the sieve shaft at equal intervals.

[0012] Preferably, convex strips are arranged at both ends of the top of the collection frame, and support strips are fixed on the inner wall of the outer shell at the bottom of the convex strips. A clamping structure is formed between the support strips and the convex strips.

[0013] The screening method of the negative ion material screening device for air purification includes the following steps: S1. Feeding preparation: Uniformly feed the negative ion material to be screened into the feeding port of the screening device to avoid a decrease in screening efficiency caused by uneven feeding; S2. Preliminary screening: The negative ion material falls from the feeding port to the top of the roller screen. The roller screen forms a dynamic sieve surface through the horizontally arranged sieve shafts and the roller disks on the shafts. During the rotation, the negative ion material smaller than the sieve surface gap falls from the gaps of the roller disks under the action of its own weight and the rotating force of the sieve shaft, while the negative ion material larger than the sieve holes remains on the sieve surface and continues to move forward in the rotation direction and falls into the collection frame arranged on one side, removing impurities with larger particle sizes. Moreover, the dynamic sieve surface can avoid the sieve holes being blocked by large particles, and the rapid rotating force can effectively disperse the agglomeration of fine particles; S3. Precision screening: After preliminary screening by the roller screen, the negative ion material falls into the middle hole screen frame. When the eccentric wheel rotates and drives the connecting rod to shake, the middle hole screen frame shakes under the support of the elastic component, and the negative ion material inside is screened, and the material with slightly larger aperture remains inside the middle hole screen frame. When the middle hole screen frame shakes left and right, the particles roll to one side with the inclination angle and fall into the prepared collection frame. Then, the negative ion material after screening falls into the small hole screen frame. The aperture of the small hole screen frame is smaller than that of the middle hole screen frame. Under vibration, the smaller particles fall into the collection frame under their own gravity, while the particles with qualified aperture slide to one side with the inclination slope and are discharged from the discharge port; S4. Gradual collection: Open the door and collect particles of different particle size ranges in the collection frame respectively, send the materials of each layer into the corresponding storage tank, and empty the collection frame for subsequent screening.

[0014] Compared with the prior art, the invention has the following beneficial effects: the negative ion material screening device for air purification and the screening method thereof, when screening the negative ion material, achieves uniform material particle size by setting three-stage screening, improves screening efficiency by three-stage dynamic screen design, avoids screen clogging, and realizes easy disassembly, cleaning or replacement of the screen frame by designing components such as the card block and the card slot, and simplifies the operation; 1. Through the setting of multi-stage screening, the roller screen uses the gap between the parallel rotating rollers to intercept large particles that obviously exceed the standard, preventing them from entering the subsequent precision screen and causing blockage. The medium-hole screen frame separates particles with slightly larger particle sizes through high-frequency vibration, and uses the oblique vibration trajectory to accelerate the falling of qualified particles. The small-hole screen frame also separates negative ion materials within the target particle size range through high-frequency vibration, removes "easy to agglomerate" ultrafine particles or "low-activity" coarse particles, ensures the uniformity of material particle size, and improves the negative ion release efficiency of the material; Furthermore, a vibration mechanism is provided below the medium-hole sieve frame and the small-hole sieve frame. By increasing the amplitude and frequency, the electrostatic adsorption or van der Waals force between particles is destroyed, the ultrafine particles are prevented from agglomerating and clogging the sieve holes, the risk of clogging the sieve is reduced, and the screening efficiency, equipment reliability and production benefits are improved. 2. By providing a connecting block with a limit axis inside the connecting block, the torsion block can be rotated 90° and the connection block and the elastic component can be disassembled and assembled through the cooperation of components such as a clamping block, so that the screen frame can be easily disassembled and assembled, thereby facilitating the cleaning and replacement of the screen frame and reducing the difficulty of operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a schematic diagram of the three-dimensional structure of the shell of the present invention in a cut-away state; Figure 3Three-dimensional structure schematic diagram of the collection box of the present invention in the disassembled state; Figure 4 Three-dimensional structure schematic diagram of the roller disc of the present invention in the disassembled state; Figure 5 Top view three-dimensional structure schematic diagram of the middle-hole sieve frame of the present invention; Figure 6 Bottom view three-dimensional structure schematic diagram of the middle-hole sieve frame of the present invention; Figure 7 Three-dimensional structure schematic diagram of the middle-hole sieve frame of the present invention in the disassembled state; Figure 8 Three-dimensional structure schematic diagram of the connecting block in the cut-open state of the present invention; Figure 9 For the present invention Figure 5 Partial enlarged three-dimensional structure schematic diagram at position A in the middle.

[0016] Explanation of the reference numerals in the figure: 1. Outer shell; 11. Door body; 12. Feeding port; 13. Discharging port; 2. Small-hole sieve frame; 3. Vibration mechanism; 31. Connecting shaft; 311. Eccentric wheel; 312. First servo motor; 32. Elastic component; 33. Connecting rod; 34. Connecting block; 341. Limiting shaft; 342. Spring; 343. Torsion block; 344. Clamping block; 345. Activity slot; 346. Card slot; 35. Support shaft; 4. Middle-hole sieve frame; 5. Collection box; 51. Ridge; 6. Roller sieve; 61. Sieve shaft; 62. Connecting disc; 63. Roller disc; 64. Second servo motor; 7. Support bar; 8. Collection groove; 9. Baffle. Detailed implementation manners

[0017] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0018] Please refer to Figures 1-9, the negative ion material screening device and screening method for air purification provided by the present invention include a housing 1 and a mesoporous sieve frame 4 installed inside it; a roller sieve 6 is installed at the top inside the housing 1, a small-hole sieve frame 2 is installed at the bottom of the mesoporous sieve frame 4, a feed port 12 is provided on one side of the top of the housing 1, there are several groups of roller sieves 6, and a collection box 5 is installed at the bottom on one side of the roller sieve 6. A baffle 9 is provided on the inner wall of the housing 1 at the bottom of the roller sieve 6. The roller sieve 6 includes a sieve shaft 61 installed inside the housing 1, and a second servo motor 64 is installed at one end of each sieve shaft 61. A connecting disk 62 is sleeved outside the sieve shaft 61, and a roller disk 63 is sleeved outside the sieve shaft 61 between the connecting disks 62. The connecting disks 62 and the roller disks 63 are evenly distributed on the surface of the sieve shaft 61 at equal intervals; Referring to Figures 2-4 As shown, first, the negative ion material is evenly put in from the feed port 12 and falls to the top of the roller sieve 6. The roller sieve 6 forms a dynamic sieve surface through the horizontally arranged sieve shafts 61 and the roller disks 63 on the shafts. The second servo motor 64 is started to drive multiple groups of sieve shafts 61 to rotate simultaneously. During the rotation, the negative ion material smaller than the sieve surface gap falls from the gaps of the roller disks 63 under the action of its own weight and the rotating force of the sieve shaft 61, while the negative ion material larger than the sieve holes remains on the sieve surface and continues to move forward along the rotation direction and falls into the collection box 5 provided on one side, removing impurities with larger particle sizes. Moreover, the dynamic sieve surface can prevent the sieve holes from being blocked by large particles, and the rapid rotating force can effectively disperse the agglomeration of fine particles, which is beneficial to subsequent screening. At the same time, when screening negative ion materials of different sizes, the distance between the roller disks 63 can be adjusted to achieve ideal particles; An outlet 13 is provided at the bottom of the housing 1. Vibration mechanisms 3 are provided at the bottoms of both the small-hole sieve frame 2 and the collection box 5. The vibration mechanism 3 includes a support shaft 35 installed on one side of the bottoms of the small-hole sieve frame 2 and the mesoporous sieve frame 4, and connecting rods 33 are hinged at both ends of the support shaft 35. Connecting shafts 31 are installed on the inner wall of the housing 1 at the ends of the connecting rods 33 far from the support shaft 35. Connecting blocks 34 are provided at both ends of the mesoporous sieve frame 4 and the small-hole sieve frame 2, and elastic members 32 are installed on the inner wall of the housing 1 on one side of the connecting blocks 34. Eccentric wheels 311 are installed at both ends of the connecting shaft 31, and one end of the eccentric wheel 311 is connected to the connecting rod 33. A first servo motor 312 is installed at one end of the connecting shaft 31. Collection grooves 8 are provided at the bottoms of both the mesoporous sieve frame 4 and the small-hole sieve frame 2, and both the mesoporous sieve frame 4 and the small-hole sieve frame 2 are in a slightly inclined state. A collection box 5 is installed at the bottom on one side of the mesoporous sieve frame 4, and a collection box 5 is installed at the bottom of the small-hole sieve frame 2; Referring to Figure 2 , Figure 5 and Figure 6As shown in the figure, after the negative ion material is preliminarily screened by the roller screen 6, when it falls, due to the upper-wide and lower-narrow structure of the baffle 9, the particles slide stably into the inner part of the middle-hole sieve frame 4, avoiding the material from falling into the gap at the edge of the middle-hole sieve frame 4, ensuring the screening accuracy. At the same time, start the first servo motor 312 to drive the connecting shaft 31 to rotate, driving the eccentric wheels 311 at both ends to rotate simultaneously. Driven by the eccentric wheels 311, the support shaft 35 is connected through the connecting rod 33, so that the middle-hole sieve frame 4 fixed between the elastic member 32 and the housing 1 generates left and right shaking. The shaking can improve the screening efficiency of the negative ion material, keep the materials with slightly larger pore diameters inside the middle-hole sieve frame 4, and make the particles roll to one side along the inclined angle under the left and right shaking of the middle-hole sieve frame 4 and fall into the prepared collection frame 5. Then the qualified negative ion material falls into the inner part of the small-hole sieve frame 2. The pore diameter of the small-hole sieve frame 2 is smaller than that of the middle-hole sieve frame 4. Under the same shaking, the smaller particles fall into the inner part of the collection frame 5 under their own gravity, and the particles with qualified pore diameters slide to one side along the inclined slope and are discharged from the discharge port 13. After layer-by-layer screening, the uniformity of the material particle size is ensured; A door body 11 is installed on one side of the housing 1. Convex strips 51 are provided at both ends of the top of the collection frame 5, and support strips 7 are fixed to the inner wall of the housing 1 at the bottom of the convex strips 51. A clamping structure is formed between the support strips 7 and the convex strips 51; Refer to Figure 2 and Figure 3 As shown in the figure, open the door body 11, collect the particles in different particle size ranges in the collection frame 5 respectively, directly pull out the collection frame 5 outward, so that the convex strips 51 slide outward on the top of the support strips 7, send the materials at each level into the corresponding storage tanks, empty the collection frame 5, and then place the collection frame 5 on the top of the support strips 7, so that the convex strips 51 are supported and fixed with the support strips 7 for subsequent screening; Limit shafts 341 penetrate through the inside of the connecting blocks 34, and torsion blocks 343 are fixed to one side of the limit shafts 341. Clamping blocks 344 are welded to both ends of the other side of the limit shafts 341. An activity groove 345 is arranged in the connecting block 34 outside the limit shafts 341. A spring 342 is sleeved on one side of the limit shafts 341. A clamping groove 346 is arranged at the top of the elastic member 32 outside the clamping blocks 344; Refer to Figures 7-9As shown, when cleaning or replacing the screen according to requirements, rotate the torsion block 343 by 90°. When the shape of the clamping block 344 corresponds to that of the clamping groove 346, under the action of the tension of the spring 342, the limiting shaft 341 is pushed to slide quickly to one side, so that the clamping block 344 passes through the clamping groove 346 and enters the inside of the movable groove 345. Thus, the connection between the connecting block 34 and the elastic member 32 loses its limit. After disassembling all four groups of connecting blocks 34 on the screen frame, the support shaft 35 and the connecting rod 33 are threadedly connected. Then, after disassembling the support shaft 35 and the connecting rod 33 by rotating the support shaft 35, the screen frame can be taken out. Conversely, when assembling the screen frame, first align the movable groove 345 and the clamping groove 346, and then push the torsion block 343 towards the connecting block 34 to squeeze, so that the clamping block 344 passes through the movable groove 345 and slides out of the outside of the clamping groove 346. Then rotate the torsion block 343 to drive the clamping block 344 to rotate by 90°, so that the clamping block 344 is away from the clamping groove 346, realizing the fixation between the connecting block 34 and the elastic member 32. And after the spring 342 is compressed, under the action of its resilience, the rotation of the limiting shaft 341 can be effectively avoided, thereby enhancing the stability of the connection.

[0019] The screening method based on the air purification negative ion material screening device includes the following steps: S1. Feeding preparation: Uniformly feed the negative ion material to be screened into the feeding port 12 of the screening device to avoid a decrease in screening efficiency caused by uneven feeding; S2. Preliminary screening: The negative ion material falls from the feeding port 12 to the top of the roller screen 6. The roller screen 6 forms a dynamic screen surface through the horizontally arranged screen shafts 61 and the roller discs 63 on the shafts. During the rotation, the negative ion material smaller than the screen surface gap falls from the gaps of the roller discs 63 under the action of its own weight and the rotational force of the screen shaft 61, while the negative ion material larger than the screen holes remains on the screen surface and continues to move forward in the rotation direction and falls into the inside of the collection frame 5 provided on one side to remove larger-sized impurities. And the dynamic screen surface can avoid the screen holes being blocked by large particles, and the rapid rotational force can effectively break up the agglomeration of fine particles; S3. Precision screening: The negative ion material preliminarily screened by the roller screen 6 falls into the inside of the middle-hole screen frame 4. Driven by the rotation of the eccentric wheel 311 to drive the connecting rod 33 to shake, the middle-hole screen frame 4 shakes under the support of the elastic member 32 to screen the negative ion material inside it. The material with a slightly larger pore size stays inside the middle-hole screen frame 4. Under the left and right shaking of the middle-hole screen frame 4, the particles roll to one side along the inclined angle and fall into the prepared collection frame 5 inside. Then the screened negative ion material falls into the inside of the small-hole screen frame 2. The pore size of the small-hole screen frame 2 is smaller than that of the middle-hole screen frame 4. Under vibration, the smaller particles fall into the inside of the collection frame 5 under their own gravity, while the particles with qualified pore sizes slide to one side along the inclined slope and are discharged from the discharge port 13; S4. Classification and collection: Open the door body 11, collect the particles in different particle size ranges in the collection box 5 respectively, send the materials at each level into the corresponding storage tank, and empty the collection box 5 for subsequent screening.

[0020] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An anion material screening device for air purification, comprising a housing (1) and a mesoporous sieve frame (4) installed therein; It is characterized in that: A roller sieve (6) is installed at the top inside the housing (1), a small-hole sieve frame (2) is installed at the bottom of the mesoporous sieve frame (4), and vibration mechanisms (3) are arranged at the bottoms of both the small-hole sieve frame (2) and the collection frame (5); The vibration mechanism (3) includes a support shaft (35) installed on one side of the bottoms of the small-hole sieve frame (2) and the mesoporous sieve frame (4), and connecting rods (33) are hinged at both ends of the support shaft (35). A connecting shaft (31) is installed on the inner wall of the housing (1) at the end of the connecting rod (33) away from the support shaft (35). Connecting blocks (34) are arranged at both ends of the mesoporous sieve frame (4) and the small-hole sieve frame (2), and elastic components (32) are installed on the inner walls of the housing (1) on one side of the connecting blocks (34).

2. The anion material screening device for air purification according to claim 1, wherein: An inlet (12) is arranged on one side of the top of the housing (1), a door body (11) is installed on one side of the housing (1), and an outlet (13) is arranged at the bottom of the housing (1).

3. The screening device for negative ion materials for air purification according to claim 1, wherein: Eccentric wheels (311) are installed at both ends of the connecting shaft (31), and one end of the eccentric wheel (311) is connected to the connecting rod (33). A first servo motor (312) is installed at one end of the connecting shaft (31).

4. The screening device for negative ion materials for air purification according to claim 1, characterized in that: Limit shafts (341) penetrate through the inside of the connecting blocks (34), and torsion blocks (343) are fixed on one side of the limit shafts (341). Blocks (344) are welded at both ends on the other side of the limit shafts (341).

5. The screening device for negative ion materials for air purification according to claim 4, wherein: An activity groove (345) is arranged in the connecting block (34) outside the limit shaft (341). A spring (342) is sleeved on one side of the limit shaft (341). A card slot (346) is arranged at the top of the elastic component (32) outside the block (344).

6. The screening device for negative ion materials for air purification according to claim 1, wherein: Collection grooves (8) are arranged at the bottoms of both the mesoporous sieve frame (4) and the small-hole sieve frame (2), and both the mesoporous sieve frame (4) and the small-hole sieve frame (2) are in a slightly inclined state. A collection frame (5) is installed at the bottom of one side of the mesoporous sieve frame (4), and a collection frame (5) is installed at the bottom of the small-hole sieve frame (2).

7. The screening device for negative ion materials for air purification according to claim 1, wherein: A number of groups of roller sieves (6) are provided, and a collection frame (5) is installed at the bottom of one side of the roller sieve (6). A baffle (9) is arranged on the inner wall of the housing (1) at the bottom of the roller sieve (6). The roller sieve (6) includes a sieve shaft (61) installed inside the housing (1), and a second servo motor (64) is installed at one end of each sieve shaft (61).

8. The screening device for negative ion materials for air purification according to claim 7, wherein: A connecting disc (62) is sleeved outside the sieve shaft (61), and a roller disc (63) is sleeved outside the sieve shaft (61) between the connecting discs (62). The connecting discs (62) and the roller discs (63) are evenly distributed on the surface of the sieve shaft (61) at equal intervals.

9. The screening device for negative ion materials for air purification according to claim 6, wherein: Convex strips (51) are arranged at both ends of the top of the collection frame (5), and support strips (7) are fixed on the inner walls of the housing (1) at the bottoms of the convex strips (51). A clamping structure is formed between the support strips (7) and the convex strips (51).

10. A screening method using the screening device for negative ion materials for air purification as described in claim 9, comprising the following steps, characterized in that: S1. Feeding preparation: Uniformly feed the negative ion materials to be screened into the feeding port (12) of the screening device to avoid a decrease in screening efficiency caused by uneven feeding. S2. Preliminary screening: The negative ion materials fall from the feeding port (12) to the top of the roller screen (6). The roller screen (6) forms a dynamic screen surface through the horizontally arranged screen shafts (61) and the roller discs (63) on the shafts. During rotation, the negative ion materials smaller than the screen gap fall through the gaps of the roller discs (63) under the action of their own weight and the rotational force of the screen shafts (61), while the negative ion materials larger than the screen holes remain on the screen surface and continue to move forward in the rotation direction and fall into the inside of the collection frame (5) provided on one side to remove larger-sized impurities. Moreover, the dynamic screen surface can prevent the screen holes from being blocked by large particles, and the rapid rotational force can effectively break up the agglomeration of fine particles. S3. Precision screening: The negative ion materials preliminarily screened by the roller screen (6) fall into the inside of the medium-hole screen frame (4). Driven by the rotation of the eccentric wheel (311) to shake the connecting rod (33), the medium-hole screen frame (4) shakes under the support of the elastic member (32) to screen the negative ion materials inside it. The materials with slightly larger pore diameters stay inside the medium-hole screen frame (4). With the left and right shaking of the medium-hole screen frame (4), the particles roll to one side along the inclined angle and fall into the prepared collection frame (5) inside. Then, the screened negative ion materials fall into the inside of the small-hole screen frame (2). The pore diameter of the small-hole screen frame (2) is smaller than that of the medium-hole screen frame (4). Under vibration, the smaller particles fall into the inside of the collection frame (5) under their own gravity, while the particles with qualified pore diameters slide to one side along the inclined slope and are discharged from the discharge port (13). S4. Classification collection: Open the door body (11), respectively collect the particles with different particle size ranges in the collection frame (5), send the materials at each level to the corresponding storage tanks, and empty the collection frame (5) for subsequent screening.

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