Screening device suitable for screening granular chemical materials

Abstract

A screening device suitable for screening granular chemical materials comprises a screening box body, a screen, a material conveying mechanism, a collecting box body and a vibrating mechanism, a feeding hopper is arranged on the top wall of the screening box body, a material screening space is formed in the screening box body and is divided into at least two screening cavities by at least one partition plate, and a through opening is formed between the end of the partition plate and the side wall of the screening box body; the bottom of each screening cavity forms a screening opening and is fixedly provided with a screen, the material conveying mechanism is arranged on the screening box body to drive the chemical materials in the at least two screening cavities to move in a communicating mode, a collecting cavity is formed in the collecting box body corresponding to the screening cavities, and a collecting opening is formed in the upper portion of the collecting cavity. The collecting box body is fixedly arranged on the lower portion of the screening box body, all the screening openings are communicated with all the collecting openings in an aligned mode, and the vibrating mechanism is arranged on the collecting box body and is in linkage with the material conveying mechanism to knock and vibrate the screen. Accordingly, the chemical materials in the screening cavities are sequentially screened and collected according to the particle sizes of the chemical materials, and the screening device is simple in structure and good in screening effect.

Description

Technical Field

[0001] The utility model relates to a material screening device, in particular to a screening device suitable for screening granular chemical materials. Background Art

[0002] Granular chemical materials are an important type of raw materials in chemical production. They are usually composed of a mixture of fine particles, small particles, medium particles or blocks of the same material with different particle sizes. Although granular chemical materials are usually ground before participating in chemical or physical reactions to grind block or medium particles into particles with smaller particle sizes, the granular materials after grinding still generally have uneven particle sizes, which makes granular materials of different particle sizes often have different reaction times or reaction rates in chemical or physical reactions, and some large particle size materials are difficult to fully react. These problems not only affect the quality of the products generated by the reaction, but also cause waste of materials. Therefore, it is best to screen the particle size of granular chemical materials before participating in the reaction, and classify them according to different particle sizes, so that granular chemical materials with uniform and suitable particle sizes can be selected in chemical production, thereby ensuring the uniformity of reaction rate and the integrity of material reaction.

[0003] At present, material screening devices are used in many technical fields, such as the publication number CN117443718A, which is named a classification screening machine for coal mine processing. It uses the operating principle of layered filtering and screening and vibration-assisted screening to classify and screen materials. However, it is not difficult to find that it still has some shortcomings after a detailed look at the above-mentioned prior art: (1) Materials of different particle sizes are filtered and screened from top to bottom from roughly small to large, and materials with smaller particle sizes must pass through the large particle size screening layer and the medium particle size screening layer before falling into the small particle size screening layer, which will cause a small amount of small particle size materials to be wrapped on the large particle size and medium particle size materials, thereby affecting the screening effect; (2) The vibration mechanism is driven by a separate motor, which not only increases the complexity of the device structure, but also increases the manufacturing cost of the device; (3) The vibration mechanism is to knock and vibrate the outside of the screening cylinder instead of knocking and vibrating the screening filter layer, so that the vibration effect is not good.

[0004] Therefore, how to provide a material screening device that can independently classify and screen particles of different particle sizes in granular chemical materials, and has a simple device structure and better screening effect has become one of the technical problems to be solved urgently in this field. Utility Model Content

[0005] The technical problem to be solved by this technical solution is how to provide a material screening device with a simple device structure, which can independently classify, screen and collect granular materials of different particle sizes in granular chemical materials and has a better screening effect.

[0006] In order to solve the above technical problems, the present technical scheme provides a screening device suitable for screening granular chemical materials, which comprises: a screening box, at least two screens, a material conveying mechanism, a collecting box and a vibrating mechanism, wherein the screening box is provided with a screening material space, a feed hopper communicating with the screening material space is arranged on the top wall of the screening box, at least one partition is evenly arranged vertically in the screening material space to divide the screening material space horizontally into at least two parallel screening cavities, a through opening is formed between one end of the partition and the inner side surface of the side wall of the screening box, the at least two screening cavities are connected through the at least one through opening, and the bottoms of the at least two screening cavities are both open. The at least two screens are respectively fixedly arranged at the screening openings of the at least two sub-screening cavities, the material conveying mechanism is installed on the sub-screening box to drive the chemical materials in any two adjacent sub-screening cavities to move in opposite directions and pass through each sub-screening cavity in sequence via at least one of the through openings, at least two collecting cavities are formed in the collecting box corresponding to the at least two sub-screening cavities, and the upper parts of the at least two collecting cavities are formed with open collecting openings, the collecting box is fixedly arranged at the lower part of the sub-screening box and the screening openings are aligned and connected to the collecting openings, and the vibration mechanism is installed on the collecting box and linked with the material conveying mechanism to knock and vibrate the at least two screens. Accordingly, each sub-screening chamber and each collecting chamber are arranged horizontally in parallel, and each sub-screening chamber is connected through a through port, so that the chemical material can pass through each sub-screening chamber in sequence under the drive of the material conveying mechanism, so that each sub-screening chamber can independently screen the chemical material of different particle size, and each collecting chamber can also independently collect the chemical material of different particle size, which can effectively prevent small particle size materials from being wrapped around large particle size materials and improve the screening effect; in addition, the vibration mechanism is linked to the material conveying mechanism, which can not only reduce the number of power sources used, thereby reducing energy consumption costs, but also make the structure of the sub-screening device simpler to reduce manufacturing costs; in addition, the vibration mechanism knocks and vibrates each screen, which can not only improve the vibration effect, thereby assisting in improving the screening effect, but also prevent the mesh of the screen from being blocked and prevent chemical materials from being trapped in the moving dead corner.

[0007] As another implementation of the present technical solution, the material conveying mechanism is mainly composed of at least two first rotating rods, a motor, at least two gears and at least two spiral blades, wherein each first rotating rod is respectively arranged in each sub-screening cavity along the long axis of each sub-screening cavity and the two ends of the first rotating rod are respectively rotatably arranged on the two opposite side walls of the sub-screening box through bearings, the motor is installed on the outer surface of the side wall of an outermost sub-screening cavity and the installation position of the motor is far away from the opening position of the adjacent partition, the end of the first rotating rod in the outermost sub-screening cavity close to the motor passes through the side wall and is connected to the output end of the motor, the ends of the at least two first rotating rods away from the motor all pass out of the side wall and are respectively fixedly mounted by the at least two gears, and the at least two gears are meshed with each other, and the at least two spiral blades are respectively fixedly mounted on the at least two first rotating rods, and the at least two first rotating rods are driven by the motor and the at least two gears to drive the at least two spiral blades to rotate in different directions. Accordingly, under the action of the rotating thrust of the spiral blade, the chemical material can be moved and screened in the sub-screening chamber and input into the next sub-screening chamber through the opening to continue moving and screening.

[0008] As another implementation of the technical solution, the feed hopper is arranged on the top wall of the outermost screening chamber and close to the motor, thereby allowing the chemical materials fed into the screening chamber to be fully screened through the entire moving path in the screening chamber.

[0009] As another implementation of the technical solution, the mesh size of the screen provided in each sub-screening cavity gradually increases from the outermost sub-screening cavity to the sub-screening cavity on the other side. Accordingly, each sub-screening cavity sequentially screens the chemical materials in order from small to large particle sizes to prevent the mixing of materials with different particle sizes.

[0010] As another implementation of the technical solution, the at least two sub-screening chambers except the outermost sub-screening chamber are provided with a slag discharge port and a slag discharge cover plate on the side wall near the motor, and the at least two collecting chambers are provided with a material discharge port and a material discharge cover plate on the side wall near the motor. Accordingly, the setting of the slag discharge port and the slag discharge cover plate facilitates the cleaning of the larger particle size materials that cannot be screened, and the setting of the material discharge port and the material discharge cover plate facilitates the classification and acquisition of the materials of different particle sizes collected after screening.

[0011] As another implementation of the technical solution, the screening device further comprises: a plurality of vertically arranged support legs, wherein the plurality of support legs are evenly installed at the lower part of the collecting box body, thereby the screening device can be supported on the ground or a base.

[0012] As another implementation of the technical solution, the length of the plurality of support legs near the discharge cover plate is shorter than the length of the plurality of support legs away from the discharge cover plate. Accordingly, the screening device can be arranged in an inclined shape to facilitate the cleaning of the larger particle size materials that cannot be screened, and to facilitate the classification and acquisition of the screened materials of different particle sizes.

[0013] As another implementation of the present technical solution, the vibration mechanism is mainly composed of at least two second rotating rods, at least two linking parts, a plurality of knocking blocks and a plurality of pancake-shaped eccentric blocks, wherein the second rotating rods correspond to and are parallel to the first rotating rods and are respectively arranged in each collecting chamber, and the two ends of the second rotating rods are respectively rotatably arranged on the two opposite side walls of the collecting box through bearings, and the ends of the at least two second rotating rods away from the motor both pass out of the side walls and are respectively connected to the ends of the at least two first rotating rods located on the same side and passing out of the side walls of the screening box through the at least two linking parts, the plurality of knocking blocks are divided into a plurality of groups and each group of knocking blocks is evenly arranged on the lower side surface of each screen, the plurality of pancake-shaped eccentric blocks are also divided into a plurality of groups and each group of pancake-shaped eccentric blocks is eccentrically fixedly sleeved on each second rotating rod corresponding to each group of knocking blocks, and the first rotating rod drives the pancake-shaped eccentric blocks on the second rotating rod to intermittently hit the knocking blocks through the linking part to vibrate the screen. Accordingly, the structure of the vibration mechanism is relatively simple, and can be effectively transmitted by the material conveying mechanism to perform targeted knocking and vibration on each screen, thereby ensuring a better vibration effect on the screen.

[0014] As another implementation of the technical solution, the linkage part is composed of a first sprocket, a second sprocket and an annular chain, wherein the first sprocket and the second sprocket are respectively fixedly sleeved on the ends of the first rotating rod and the second rotating rod away from the motor, and the annular chain is sleeved on the first sprocket and the second sprocket, thereby realizing effective transmission from the first rotating rod to the second rotating rod.

[0015] As another implementation of the technical solution, the number of the partitions is n, and n is an odd number > 1, so as to divide the screening space horizontally into n+1 parallel sub-screening cavities, and n staggered openings are formed between the different ends of the n partitions and the inner sides of the two opposite side walls of the sub-screening box so that the n+1 sub-screening cavities are connected in an S shape, the number of screens is also n+1 and they are fixedly arranged at each screening opening, and n+1 collecting cavities are formed in the collecting box corresponding to the n+1 sub-screening cavities. Accordingly, the sub-screening device can be used for screening two, three, or even more materials of different particle sizes, so as to meet various particle size screening requirements and improve the practicality of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of an embodiment of the utility model of a screening device suitable for screening granular chemical materials;

[0017] Figure 2 It is a top view of the sectional view of the screening box equipped with the material conveying mechanism in the above embodiment;

[0018] Figure 3 This is a schematic diagram of the vibration mechanism being arranged at the lower part of the screen in the above-mentioned embodiment;

[0019] Figure 4 This is a top sectional view of a screening box equipped with a material conveying mechanism in another embodiment of the utility model.

[0020] Explanation of symbols in the accompanying drawings: 10 screening box; 11 feed hopper; 12 partition; 13 screening chamber; 14 opening; 15 slag discharge cover plate; 16 supporting leg; 20 screen; 30 material conveying mechanism; 31 first rotating rod; 32 motor; 33 gear; 34 spiral blade; 40 collecting box; 41 discharge cover plate; 50 vibration mechanism; 51 second rotating rod; 52 linkage; 521 first sprocket; 522 second sprocket; 523 ring chain; 53 knocking block; 54 pancake-shaped eccentric block. DETAILED DESCRIPTION

[0021] The detailed description and technical contents of the present invention are described below with reference to the accompanying drawings. However, the accompanying drawings are only provided for reference and description and are not intended to limit the present invention.

[0022] In the context of this specification, any two or more embodiments of the present invention may be arbitrarily combined, and the technical solution thus formed belongs to part of the original disclosure of this specification and also falls within the protection scope of the present invention.

[0023] like Figure 1 , 2 As shown in Figures 3 and 4, it is a schematic diagram of a specific embodiment of the screening device for screening granular chemical materials of the present invention. The screening device for screening granular chemical materials (hereinafter referred to as the screening device) includes a screening box 10, at least two screens 20, a material conveying mechanism 30, a collecting box 40 and a vibrating mechanism 50. As shown in the figure, the screening box 10 and the corresponding collecting box 40 are both rectangular, but the present invention does not limit the appearance of the above components. The screening box 10 has a screening space, and a feed hopper 11 connected to the screening space is arranged on the top wall of the screening box 10. At least one partition 12 is evenly distributed vertically in the screening space to divide the screening space horizontally into at least two parallel screening chambers 13, and one end of the partition 12 is formed with a through opening 14 between the inner side surface of the side wall of the screening box 10. In order to facilitate the description of the details, the screening device is illustrated as having one partition 12 in this embodiment. Combined with Figure 2 and 3As shown, the sub-screening box 10 is divided into two sub-screening chambers 13 by a partition 12, and a through hole 14 is formed between the partition 12 and the inner side of the side wall of the sub-screening box 10, and the two sub-screening chambers 13 are connected through the through hole 14, and the bottoms of the two sub-screening chambers 13 are formed with open screening ports (not shown in the figure), and the number of screens 20 corresponding to the number of screening ports is also two, and the two screens 20 are fixedly arranged at the screening ports of the two sub-screening chambers 13, respectively. The material conveying mechanism 30 is installed on the sub-screening box 10 to drive the two sub-screening chambers 13. The chemical materials move in opposite directions and pass through the through opening 14 so that the chemical materials pass through each sub-screening cavity 13 in sequence for screening and filtration. Two collecting cavities (not shown) are formed in the collecting box 40 corresponding to the two sub-screening cavities 13, and the upper parts of the two collecting cavities are formed with open collecting ports (not shown). The collecting box 40 is fixedly arranged at the lower part of the sub-screening box 10 so that each screening port is aligned and connected to each collecting port. The vibration mechanism 50 is installed on the collecting box 40 and linked with the material conveying mechanism 30 to knock and vibrate the two screens 20. Accordingly, the sub-screening device containing two sub-screening cavities 13 and two collecting cavities can screen chemical materials with two different particle sizes.

[0024] Specifically, the material conveying mechanism 30 is composed of two first rotating rods 31, a motor 32, two gears 33 and two spiral blades 34 corresponding to the two sub-screening chambers 13. Among them, each first rotating rod 31 is respectively arranged in each sub-screening chamber 13 along the long axis of each sub-screening chamber 13, and the two ends of the first rotating rod 31 are rotatably arranged on the two opposite side walls of the sub-screening box 10 through bearings (not shown in the figure). The motor 32 is installed on the outer side of the side wall of the outermost (shown as the right side in the figure) sub-screening chamber 13, and the installation position of the motor 32 is far away from the opening position of the opening 14 of the adjacent partition 12, and the end of the first rotating rod 31 in the outermost sub-screening chamber 13 close to the motor 32 passes through the side wall and is connected to the output end of the motor 32. The ends of the two first rotating rods 31 away from the motor 32 pass out of the side wall and are fixedly sleeved by the two gears 33, and the two gears 33 are meshed with each other. The two spiral blades 34 are fixedly mounted on the two first rotating rods 31, respectively. The two first rotating rods 31 are driven by the motor 32 and the two gears 33 to drive the two spiral blades 34 to rotate in different directions, so that the chemical materials enter the sub-screening chamber 13 on the left side from the sub-screening chamber 13 on the right side through the opening 14 under the action of the rotating thrust of the spiral blades 34, and are screened and filtered during the movement of the chemical materials. The feed hopper 11 is arranged on the top wall of the outermost sub-screening chamber 13 and is close to the motor 32. The chemical materials are put into the sub-screening chamber 13 on the right side through the feed hopper 11, and after sufficient screening and filtration, they are moved into the sub-screening chamber 13 on the left side for the next step of screening and filtration. In addition, in the direction from the outermost sub-screening chamber 13 to the sub-screening chamber 13 on the other side (i.e. Figure 2 (from right to left in the figure), the mesh size of the screen 20 provided in each sub-screening chamber 13 is gradually increased, so that each sub-screening chamber 13 sequentially screens the chemical materials in order from small to large particle sizes to prevent the mixing of materials of different particle sizes. In addition, the sub-screening chamber 13 on the left side is also provided with a slag discharge port (not shown in the figure) on the side wall adjacent to the motor 32 and is equipped with a slag discharge cover 15, and the two collecting chambers are both provided with a material discharge port (not shown in the figure) on the side wall adjacent to the motor 32 and are equipped with a material discharge cover 41. The setting of the slag discharge port and the slag discharge cover 15 is convenient for cleaning the larger particle size materials that cannot be screened, and the setting of the material discharge port and the material discharge cover 41 is convenient for classifying and obtaining the materials of different particle sizes collected after screening.

[0025] In this embodiment, combined with Figure 3 As shown, the vibration mechanism 50 corresponds to the screen 20 of the two sub-screening chambers 13 and is composed of two second rotating rods 51, two linkage parts 52, a plurality of knocking blocks 53 and a plurality of pancake-shaped eccentric blocks 54. Among them, each second rotating rod 51 corresponds to and is parallel to each first rotating rod 31 and is respectively arranged in each collecting chamber, and the two ends of the second rotating rod 51 are rotatably arranged on the two opposite side walls of the collecting box 40 through bearings (not shown in the figure), and the ends of the two second rotating rods 51 away from the motor 32 are both passed through the side wall of the collecting chamber and are respectively connected to the ends of the two first rotating rods 31 located on the same side and passing through the side wall of the sub-screening box 10 through the two linkage parts 52. The multiple knocking blocks 53 are divided into several groups ( Figure 3 The corresponding number of sub-screening cavities is shown as two groups, each group contains two knocking blocks), and each group of knocking blocks 53 is evenly arranged on the lower side of each screen 20, and the multiple pie-shaped eccentric blocks 54 are also divided into several groups ( Figure 3 The first rotating rod 31 drives the pie-shaped eccentric blocks 54 on the second rotating rod 51 to intermittently hit the knocking blocks 53 through the linkage 52, so that the screen 20 vibrates. Further, the linkage 52 can be composed of a first sprocket 521, a second sprocket 522 and an annular chain 523, and the first sprocket 521 and the second sprocket 522 are respectively fixedly mounted on the ends of the first rotating rod 31 and the second rotating rod 51 away from the motor 32, wherein the first sprocket 521 can be fixedly mounted on the outer side or the inner side of the gear 33, and the utility model is not limited to this, and the annular chain 523 is mounted on the first sprocket 521 and the second sprocket 522. Therefore, the structure of the vibration mechanism 50 is relatively simple, and the material conveying mechanism 30 can be effectively driven to perform targeted knocking and vibration on each screen 20, thereby ensuring a better vibration effect on the screen 20.

[0026] like Figure 4As shown, as another embodiment of the utility model, the number of the partitions 12 is n, and n is an odd number > 1, that is, the number of the partitions 12 is three, five..., and three partitions 12 are used as an example in the figure to divide the screening material space horizontally into n+1 parallel sub-screening chambers 13, that is, the sub-screening chambers are four, six..., and four sub-screening chambers 13 are used as an example in the figure, and the different ends of the n partitions 12 are formed with n staggered openings 14 between the inner sides of the two side walls opposite to the sub-screening box 10, and three openings 14 are used as an example in the figure to make the n+1 sub-screening chambers 13 connected in an S shape. Corresponding to the number of n+1 screening chambers, the number of components such as the screen, the collecting chamber, the first rotating rod, the second rotating rod, the gear, the spiral blades, the linkage part, etc. is also n+1. This makes the screening device suitable for classifying and screening granular materials into more than two, i.e. four, six... particle sizes, thereby meeting the needs of screening more particle sizes and improving the practicality of the device.

[0027] In the above two embodiments, in order to support the screening device on the ground or the base, the screening device may further include a plurality of vertically arranged support legs 16, which are evenly installed at the lower part of the collecting box 40. Further, the length of the plurality of support legs 16 near the discharge cover plate 41 among the plurality of support legs 16 is smaller than the length of the plurality of support legs 16 far from the discharge cover plate 41, so that the screening device can be arranged in an inclined shape, so as to facilitate the cleaning of the larger particle size materials that cannot be screened, and facilitate the classification and acquisition of the screened materials of different particle sizes.

[0028] In summary, the sub-screening chambers and the collecting chambers in the sub-screening device of the utility model are arranged horizontally in parallel, and the sub-screening chambers are connected through the through openings, so that the chemical materials can pass through the sub-screening chambers in sequence under the drive of the material conveying mechanism, so that each sub-screening chamber can independently screen and filter chemical materials of different particle sizes, and each collecting chamber can also independently collect chemical materials of different particle sizes, which can effectively prevent small-size materials from being wrapped around large-size materials and improve the screening effect; in addition, the vibration mechanism is linked to the material conveying mechanism, which can not only reduce the number of power sources used, thereby reducing energy consumption costs, but also make the structure of the sub-screening device simpler to reduce manufacturing costs; in addition, the vibration mechanism knocks and vibrates each screen, which can not only improve the vibration effect, thereby assisting in improving the screening effect, but also prevent the mesh of the screen from being blocked and prevent chemical materials from being trapped in moving dead corners.

[0029] The above are only preferred embodiments of the present invention and are not intended to limit the patent scope of the present invention. Other equivalent changes made using the patent concept of the present invention should all fall within the patent protection scope of the present invention.

Claims

1. A screening device suitable for screening granular chemical materials, comprising: A sub-screening box, at least two screens, a material conveying mechanism and a collecting box, wherein the sub-screening box has a screening space, and a feed hopper communicating with the screening space is arranged on the top wall of the sub-screening box, characterized in that it also includes: a vibration mechanism, at least one partition is evenly arranged vertically in the screening space to divide the screening space horizontally into at least two parallel sub-screening cavities, a through opening is formed between one end of the partition and the inner side surface of the side wall of the sub-screening box, the at least two sub-screening cavities are connected through at least one of the through openings, the bottoms of the at least two sub-screening cavities form open screening openings, and the at least two screens are fixedly arranged on the at least two sub-screening cavities, respectively. The material conveying mechanism is installed on the sub-screening box to drive the chemical materials in any two adjacent sub-screening cavities to move in opposite directions and pass through each sub-screening cavity in sequence via at least one of the through ports. At least two collecting cavities are formed in the collecting box corresponding to the at least two sub-screening cavities, and the upper parts of the at least two collecting cavities are formed with open collecting ports. The collecting box is fixedly arranged at the lower part of the sub-screening box and makes the screening ports align and connect with each collecting port. The vibration mechanism is installed on the collecting box and is linked with the material conveying mechanism to knock and vibrate the at least two screens.

2. The screening device according to claim 1, characterized in that: The material conveying mechanism is mainly composed of at least two first rotating rods, a motor, at least two gears and at least two spiral blades, wherein each of the first rotating rods is respectively arranged in each sub-screening cavity along the long axis of each sub-screening cavity and the two ends of the first rotating rod are rotatably arranged on the two opposite side walls of the sub-screening box through bearings, the motor is installed on the outer side surface of the side wall of the outermost sub-screening cavity and the installation position of the motor is far away from the opening position of the adjacent partition, the end of the first rotating rod in the outermost sub-screening cavity close to the motor passes through the side wall and is connected to the output end of the motor, the ends of the at least two first rotating rods away from the motor all pass out of the side wall and are fixedly sleeved by the at least two gears, and the at least two gears are meshed with each other, the at least two spiral blades are respectively fixedly sleeved on the at least two first rotating rods, and the at least two first rotating rods are driven by the motor and the at least two gears to drive the at least two spiral blades to rotate in different directions.

3. The screening device according to claim 2, characterized in that: The feed hopper is arranged on the top wall of the outermost screening chamber and is close to the motor.

4. The screening device according to claim 2, characterized in that: In the direction from the outermost sub-screening cavity to the sub-screening cavity on the other side, the mesh size of the screen provided in each sub-screening cavity gradually increases.

5. The screening device according to claim 2, characterized in that: The at least two sub-screening chambers except the outermost sub-screening chamber are provided with slag discharge ports on the side walls adjacent to the motor and are equipped with slag discharge cover plates, and the at least two collecting chambers are provided with material discharge ports on the side walls adjacent to the motor and are equipped with material discharge cover plates.

6. The screening device according to claim 5, characterized in that: Also includes: A plurality of vertically arranged support legs are evenly installed at the lower part of the collection box.

7. The screening device according to claim 6, characterized in that: Among the plurality of supporting legs, the lengths of the plurality of supporting legs adjacent to the discharge cover plate are shorter than the lengths of the plurality of supporting legs away from the discharge cover plate.

8. The screening device according to claim 2, characterized in that: The vibration mechanism is mainly composed of at least two second rotating rods, at least two linkage parts, a plurality of knocking blocks and a plurality of pancake-shaped eccentric blocks, wherein each of the second rotating rods corresponds to and is parallel to each of the first rotating rods and is respectively arranged in each of the collecting chambers, and the two ends of the second rotating rods are rotatably arranged on the two opposite side walls of the collecting box body through bearings, and the ends of the at least two second rotating rods away from the motor both pass out of the side walls and are respectively connected to the ends of the at least two first rotating rods located on the same side and passing out of the side walls of the screening box body through the at least two linkage parts, the plurality of knocking blocks are divided into a plurality of groups and each group of knocking blocks is evenly arranged on the lower side surface of each of the screens, the plurality of pancake-shaped eccentric blocks are also divided into a plurality of groups and each group of pancake-shaped eccentric blocks is eccentrically fixedly sleeved on each of the second rotating rods corresponding to each group of knocking blocks, and the first rotating rod drives the pancake-shaped eccentric blocks on the second rotating rod to intermittently hit the knocking blocks through the linkage part to vibrate the screen.

9. The screening device according to claim 8, characterized in that: The linkage part is composed of a first sprocket, a second sprocket and an endless chain, wherein the first sprocket and the second sprocket are respectively fixedly sleeved on the ends of the first rotating rod and the second rotating rod away from the motor, and the endless chain is sleeved on the first sprocket and the second sprocket.

10. The screening device according to claim 1, characterized in that: The number of the partitions is n, and n is an odd number > 1, so as to divide the screening space horizontally into n+1 parallel sub-screening cavities, and n through openings distributed in an alternating manner are formed between different ends of the n partitions and the inner surfaces of the two opposite side walls of the sub-screening box to make the n+1 sub-screening cavities connected in an S shape, the number of the screens is also n+1 and they are respectively fixedly arranged at each of the screening material openings, and n+1 collecting cavities are formed in the collecting box corresponding to the n+1 sub-screening cavities.

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