Circulating type multi-stage fine screening equipment for cereal food crops

Abstract

Circulating type multi-stage fine screening equipment for grain crops belongs to the technical field of grain processing equipment, achieves circulating type multi-stage fine screening treatment of the grain crops through a multi-stage screening structure, achieves high-precision and multi-layer screening of the grain crops, sequentially improves the precision of screening assemblies in the multi-stage screening structure, and improves the screening efficiency. Through cooperation with cooperative work of the swing assembly, the flotation assembly and the like, grains with different granularities can be effectively separated, various impurities such as straw chippings and dust can be effectively removed, particle aggregation and screen hole blockage are avoided, the purity of screened products is greatly improved, meanwhile, the equipment integrates various innovative functions, the manual cleaning and maintenance cost is reduced on the basis that efficient screening is guaranteed, and the production efficiency is improved. And the production efficiency is improved, and the strict requirements of modern high-quality cereal grain processing on screening equipment can be met.

Description

Technical Field

[0001] The invention belongs to the technical field of grain processing equipment and relates to a cereal crop screening device, in particular to a circulating multi-stage fine screening device for cereal crops. Background Art

[0002] In the field of agricultural production, screening is a crucial link in the processing of cereal crops. Its purpose is to accurately separate impurities, particles of different sizes and grains of poor quality in cereals, so as to ensure the quality of cereals and meet subsequent processing and market needs.

[0003] Traditional cereal screening equipment has many limitations. Common vibrating screening equipment mostly relies on a simple vibration motor to drive the screen to vibrate and screen by the difference in screen aperture. However, the movement trajectory of cereal grains on the screen surface is relatively single, and it is easy for grains to agglomerate and block the screen holes, making it difficult to effectively separate some fine impurities or grains of similar particle sizes, resulting in low purity of the screened product. In addition, there are many kinds of impurities mixed into cereal crops during the harvesting process, including straw debris, dust and other impurities. When faced with such complex situations, ordinary vibrating screens have poor screening accuracy. Summary of the invention

[0004] The purpose of the present invention is to target an existing circulating multi-stage fine screening equipment for cereal crops. The advantage of the present invention is that a circulating multi-stage fine screening treatment of cereal crops is realized through a multi-stage screening structure, so as to achieve high-precision, multi-level screening of cereal crops. The precision of the screening components in the multi-stage screening structure is improved successively, and the coordinated work of the swing component, the flotation component, etc. can effectively separate cereals of different particle sizes, remove straw debris, dust and other impurities, avoid particle agglomeration and sieve hole clogging, and greatly improve the purity of the screened product. At the same time, the equipment integrates a variety of innovative functions. On the basis of ensuring efficient screening, it reduces the cost of manual cleaning and maintenance, improves production efficiency, and can meet the stringent requirements of modern high-quality cereal processing for screening equipment.

[0005] The present application provides a circulating multi-stage fine screening device for cereal crops, which adopts the following technical scheme: A circulating multi-stage fine screening device for cereal crops, comprising a screening box and a collection box, wherein the collection box is bolted to the bottom of the screening box, a multi-stage screening structure is arranged inside the screening box, a plurality of discharge ports are bolted to the right side of the screening box, and the discharge ports are used in conjunction with the multi-stage screening structure, an air pipe is bolted to the inside of the collection box, and the air pipe is connected to the multi-stage screening structure; The multi-stage screening structure includes a plurality of screening components arranged in a stacked manner, the screening accuracy of the screening components increasing sequentially from top to bottom. A gas collection chamber is bolted to the left side of the front side of the inner wall of the screening box, and a number of swing components are arranged inside the gas collection chamber. One side of the swing component close to the screening component is connected thereto, and flotation components are bolted to the bottoms of the top and middle screening components.

[0006] With the above technical solution, through the multi-stage screening structure, a cyclic multi-stage fine screening process for cereal crops is realized, achieving high-precision and multi-level screening of cereal crops. In the multi-stage screening structure, the screening accuracy of the screening components increases sequentially. Cooperating with the swing components, flotation components, etc. to work together, it can effectively separate grains of different particle sizes, remove various impurities such as straw debris and dust, avoid particle agglomeration and screen hole blockage, greatly improve the purity of the screened product. At the same time, the equipment integrates a variety of innovative functions, reducing the manual cleaning and maintenance costs while ensuring efficient screening, improving the production efficiency, and being able to meet the stringent requirements of modern high-quality cereal processing for screening equipment.

[0007] The present invention is further configured as: the screening component includes a mounting frame, the mounting frame is bolted inside the screening box, a screening plate is slidably arranged inside the mounting frame, and limiting wheels are rotatably connected to both sides of the front and rear sides of the screening plate. Limiting grooves are opened on the front and rear sides of both sides of the inner wall of the mounting frame, and the limiting wheels are rollingly arranged inside the limiting grooves. Jacking blocks are bolted to the inner walls of the left two limiting grooves, and the jacking blocks are used in cooperation with the left limiting wheels. A cleaning member is arranged on the right side of the inner wall of the mounting frame, and the cleaning member is used in cooperation with the screening plate.

[0008] With the above technical solution, by setting the screening component, while screening, the swing component drives the screening plate to move back and forth cyclically inside the mounting frame, and the movement trajectory of the screening plate can be restricted by the rolling of the limiting wheels in the limiting grooves, making the movement of the screening plate flexible, changing the movement trajectory of the grains, and improving the screening efficiency. When the left limiting wheel moves to the position of the jacking block, the left side of the screening plate will move upward, so that as the limiting wheel rises, the screening plate gradually inclines, and the inclination angle gradually increases, prompting the large-grain grains screened out on the sieve surface to quickly slide down to the discharge port under the action of gravity and be discharged. And by setting the cleaning member, when the screening plate contacts it, it will push it to swing, making the lower end of it contact the bottom surface of the screening plate, causing the screening plate to vibrate, which can not only replace the screening efficiency but also achieve the effect of preventing the screening plate from being blocked.

[0009] The present invention is further configured as: a slope is arranged on the right side of the top of the jacking block, and the jacking block is used in cooperation with the limiting wheel through the slope.

[0010] Adopting the above technical solution, the inclined surface design of the jacking block makes the tilting process of the screening plate smoother, which can effectively discharge the large-grain grains remaining on the screening surface, avoid the accumulation of grains from affecting the screening effect, and further improve the screening efficiency.

[0011] The present invention is further configured as follows: a fixed frame is bolted to the top inside the screening box, and a distribution plate is slidably arranged inside the fixed frame. Flexible connecting plates are bolted to the front side and the rear side of the bottom of the distribution plate, and the bottom of the flexible connecting plate is bolted to the top screening plate.

[0012] Adopting the above technical solution, by arranging the distribution plate, when the screening plate moves, the distribution plate will be driven to slide inside the fixed frame through the flexible connecting plate. After the grains enter the screening box, they first fall on the distribution plate. Due to the multiple holes distributed in the distribution plate, the grains can fall in a water curtain shape, which plays a role in dispersing the grains, also avoids the adhesion between the grains, and facilitates the subsequent screening process.

[0013] The present invention is further configured as follows: flexible connecting parts are arranged at the tops of both sides of the distribution plate and the screening plate, and one side of the flexible connecting plate close to the inner walls of the fixed frame and the installation frame is connected to the two respectively.

[0014] Adopting the above technical solution, the flexible connecting part ensures the flexibility of the movement of the screening plate and the distribution plate, and at the same time avoids the leakage of grains, improving the sealing performance and screening effect of the equipment.

[0015] The present invention is further configured as follows: the swinging assembly includes a rotating shaft, the rotating shaft is rotatably connected inside the air collecting cavity, a rotating paddle and a turntable are respectively sleeved on the front side and the rear side of the surface of the rotating shaft, a connecting rod is rotatably connected to the bottom of the front side of the turntable, a connecting rod is bolted to the inside of the other end of the connecting rod, and the rear side of the connecting rod penetrates through the inside of the installation frame and is rotatably connected to the screening plate.

[0016] Adopting the above technical solution, by arranging the swinging assembly, the air collecting cavity is communicated with the air pipe, some gas in the air pipe will enter the air collecting cavity and rise, and push the rotating paddle and the rotating shaft to rotate. The turntable on the rotating shaft will rotate accordingly. The turntable drives the screening plate to make a reciprocating swing through the connecting rod and the connecting rod. During the swinging process, the movement track of the grains on the screening surface becomes complex, increasing the contact and separation opportunities with the sieve mesh. The swinging assembly is driven by air flow to make the screening plate swing, change the movement state of the grains, strengthen the screening effect, reduce the phenomenon of particle agglomeration and blockage of the sieve holes, and improve the screening efficiency and accuracy.

[0017] The present invention is further configured as follows: The cleaning member includes two support plates, which are bolted to the front side and the rear side of the inner wall of the right side of the installation frame. A support roller is rotatably connected between the opposite sides of the two support plates. A pushing arm and a swinging arm are respectively welded to the top and the bottom of the support roller. A striking head is arranged on the side of the swinging arm away from the support roller. Both the striking head and the pushing arm are used in cooperation with the screening plate.

[0018] With the above technical solution, by arranging the cleaning member, when the screening plate contacts the pushing arm, the pushing arm pushes the support roller to rotate, driving the swinging arm and the striking head to swing. The striking head knocks on the surface of the screening plate to shake off the grains adhering to the screening plate. When the screening plate leaves the pushing arm, the support roller resets under the action of gravity and waits for the next cleaning. The arrangement of the cleaning member automatically cleans the screening plate without manual intervention, reduces the maintenance workload, prevents the sieve holes from being blocked, and ensures the continuous and stable screening performance of the screening plate.

[0019] The present invention is further configured as follows: The flotation assembly includes an aggregate plate, which is bolted to the bottom of the installation frame. A discharge pipe is communicated with the bottom of the aggregate plate. Flow guide plates are communicated with the bottoms of the discharge pipes at the top and the middle. A guiding shell is bolted inside the flow guide plate. Discharge pipes are communicated with the front side and the rear side of the guiding shell respectively. The other ends of the discharge pipes extend to the outside of the screening box.

[0020] With the above technical solution, by arranging the flotation assembly, the grains screened by the screening assembly fall onto the aggregate plate of the flotation assembly and fall from the discharge pipe. During the feeding process, the air flow introduced from the air pipe rises through the discharge pipe in turn. When part of the air flow is under the aggregate plate, under the action of the flow guide plate and the guiding shell, the air flow forms a specific flow field, so that the light impurities and inferior grains are discharged from the screening box through the discharge pipe under the action of the air flow, while the heavier high-quality grains continue to fall for collection. The flotation assembly uses the air flow to realize the sorting of the grain quality, effectively separates the high-quality and inferior grains, improves the overall quality of the cereal grains, and perfects the function of the multi-stage screening equipment.

[0021] The present invention is further configured as follows: Both ends of the flow guide plate are integrally arranged in a spiral shape, and the guiding shell is communicated with the flow guide plate.

[0022] With the above technical solution, the air flow field is optimized by the spiral flow guide plate, the separation effect of the flotation assembly on the light impurities and inferior grains is enhanced, the accuracy of the grain quality sorting is improved, and it also restricts the flow path of the air flow to prevent the guided light impurities from re-converging to the flotation position, ensuring the separation quality.

[0023] The present invention is further configured as follows: Fixing plates are bolted to both sides of the air pipe, and both sides of the fixing plates are bolted to the inner wall of the aggregate box. A connecting pipe is communicated with the front side of the air pipe, and the connecting pipe is communicated with the air collecting cavity.

[0024] With the above technical solutions, the stable delivery of air flow is ensured through the fixation and connection design of the air pipe, providing a reliable guarantee for the normal operation of the swing assembly and the flotation assembly, and ensuring the stability and continuity of the overall operation of the equipment.

[0025] In summary, the present invention includes at least one of the following beneficial technical effects: (1) In the present invention, by setting up the screening assembly and the swing assembly, the swing assembly causes the screening assembly to swing, driving the grains to move in a complex manner on the sieve surface, increasing the contact opportunity and separation probability between the grains and the sieve mesh, strengthening the screening effect, so that the screening assembly changes the movement trajectory of the grains on the sieve surface, effectively avoiding particle agglomeration and sieve hole blockage, and improving the screening efficiency.

[0026] (2) In the present invention, by setting up the flotation assembly, while screening, the flotation assembly can further sort the screened grains, distinguish the plump grains from the inferior grains such as shriveled and insect-eaten grains, improve the overall quality of cereal grains, and through the cooperation of the flotation assembly and the multi-stage screening structure, achieve all-round fine processing of cereal grains from particle size to quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic diagram of the overall structure of the present invention.

[0028] Figure 2 is a schematic diagram of the connection between the multi-stage screening structure and the screening box of the present invention.

[0029] Figure 3 is a schematic diagram of the structure of the screening assembly of the present invention.

[0030] Figure 4 is a schematic diagram of the connection between the cleaning part and the installation frame of the present invention.

[0031] Figure 5 is a schematic diagram of the connection between the swing assembly and the screening assembly of the present invention.

[0032] Figure 6 is a schematic diagram of the connection between the flotation assembly and the screening assembly of the present invention.

[0033] In the figure: screening box 1, aggregate box 2, multi-stage screening structure 3, screening assembly 4, mounting frame 41, screening plate 42, limiting wheel 43, limiting slot 44, jacking block 45, cleaning member 46, support plate 461, support roller 462, push arm 463, swing arm 464, striking head 465, air collecting chamber 5, swing assembly 6, rotating shaft 61, rotating paddle 62, turntable 63, connecting rod 64, connecting rod 65, flotation assembly 7, aggregate plate 71, discharge pipe 72, guide plate 73, guiding shell 74, discharge pipe 75, discharge port 8, air pipe 9, fixed frame 10, uniform distribution plate 11, flexible connecting plate 12, flexible connecting portion 13, fixing plate 14, connecting pipe 15. Detailed implementation manners

[0034] The present invention will be further illustrated below in conjunction with the accompanying drawings and detailed implementation manners. It should be understood that these implementation manners are only used to illustrate the invention patent and not to limit the scope of the invention patent. After reading the invention patent, various equivalent modifications made by those skilled in the art fall within the scope defined by the appended claims of this application.

[0035] Example 1 is as Figures 1-6 shown. A cyclic multi-stage fine screening device for cereal crops includes a screening box 1 and an aggregate box 2. The aggregate box 2 is bolted to the bottom of the screening box 1. A multi-stage screening structure 3 is arranged inside the screening box 1. A plurality of discharge ports 8 are bolted to the right side of the screening box 1, and the discharge ports 8 are used in cooperation with the multi-stage screening structure 3. An air pipe 9 is bolted inside the aggregate box 2, and the air pipe 9 is communicated with the multi-stage screening structure 3.

[0036] The multi-stage screening structure 3 includes a plurality of screening assemblies 4 arranged in a stacked manner. The screening accuracy of the screening assemblies 4 increases successively from top to bottom. A gas collecting chamber 5 is bolted to the left side of the front inner wall of the screening box 1, and a plurality of swing assemblies 6 are arranged inside the gas collecting chamber 5. One side of the swing assembly 6 close to the screening assembly 4 is connected to it. Flotation assemblies 7 are bolted to the bottoms of the top and middle screening assemblies 4. Through the multi-stage screening structure 3, a cyclic multi-stage fine screening process of cereal crops is realized, achieving high-precision and multi-level screening of cereal crops. The screening accuracy of the screening assemblies 4 in the multi-stage screening structure 3 increases successively. Cooperating with the swing assembly 6, the flotation assembly 7 and other components working together, it can effectively separate grains of different particle sizes, remove various impurities such as straw debris and dust, avoid particle agglomeration and screen hole blockage, greatly improve the purity of the screened product. At the same time, the device integrates a variety of innovative functions. On the basis of ensuring efficient screening, it reduces the manual cleaning and maintenance costs, improves the production efficiency, and can meet the stringent requirements of modern high-quality cereal processing for screening equipment.

[0037] As Figure 3As shown in the figure, the screening assembly 4 includes a mounting frame 41. The mounting frame 41 is bolted inside the screening box 1. A screening plate 42 is slidably arranged inside the mounting frame 41. Limiting wheels 43 are rotatably connected to both the front and rear sides of the screening plate 42. Limiting grooves 44 are formed on both the front and rear sides of the inner wall of the mounting frame 41. The limiting wheels 43 are rollingly arranged inside the limiting grooves 44. Lifting blocks 45 are bolted to the inner walls of the left two limiting grooves 44. The lifting blocks 45 are used in cooperation with the left limiting wheels 43. A cleaning member 46 is arranged on the right side of the inner wall of the mounting frame 41. The cleaning member 46 is used in cooperation with the screening plate 42. By providing the screening assembly 4, while screening, the swinging assembly 6 drives the screening plate 42 to move reciprocally inside the mounting frame 41. The movement track of the screening plate 42 can be restricted by the rolling of the limiting wheels 43 in the limiting grooves 44, making the movement of the screening plate 42 flexible, changing the movement track of the grains, and improving the screening efficiency. When the left limiting wheel 43 moves to the position of the lifting block 45, the left side of the screening plate 42 will move upward. Thus, as the limiting wheel 43 rises, the screening plate 42 gradually tilts, and the tilt angle gradually increases, prompting the large-grain grains screened out on the sieve surface to quickly slide down to the discharge port 8 under the action of gravity and be discharged. By providing the cleaning member 46, when the screening plate 42 contacts it, it will push the cleaning member 46 to swing, making the lower end of the cleaning member 46 contact the bottom surface of the screening plate 42, causing the screening plate 42 to vibrate. This not only can replace the screening efficiency but also achieves the effect of preventing the screening plate 42 from being blocked.

[0038] As Figure 3 shown, a slope is provided on the right side of the top of the lifting block 45. The lifting block 45 is used in cooperation with the limiting wheel 43 through the slope. The slope design of the lifting block 45 makes the tilting process of the screening plate 42 smoother, can effectively discharge the large-grain grains remaining on the sieve surface, avoid grain accumulation from affecting the screening effect, and further improve the screening efficiency.

[0039] As Figure 2 shown, a fixed frame 10 is bolted to the top inside the screening box 1. A distribution plate 11 is slidably arranged inside the fixed frame 10. Flexible connecting plates 12 are bolted to both the front and rear sides of the bottom of the distribution plate 11. The bottoms of the flexible connecting plates 12 are bolted to the top screening plate 42. By providing the distribution plate 11, when the screening plate 42 moves, it will drive the distribution plate 11 to slide inside the fixed frame 10 through the flexible connecting plates 12. After the grains enter the screening box 1, they first fall on the distribution plate 11. Due to the multiple holes distributed in the distribution plate 11, the grains can fall in a water curtain shape, playing a role in dispersing the grains, and also avoiding the adhesion between the grains, facilitating the subsequent screening process.

[0040] As Figure 4As shown, flexible connection parts 13 are provided at the tops on both sides of the uniform distribution plate 11 and the screening plate 42, and one side of the flexible connection plate 12 close to the inner walls of the fixed frame 10 and the installation frame 41 is connected to the two respectively. The flexible connection part 13 ensures the flexibility of the movement of the screening plate 42 and the uniform distribution plate 11, while avoiding grain leakage, improving the sealing performance and screening effect of the equipment.

[0041] As Figure 5 shown, the swing assembly 6 includes a rotating shaft 61, the rotating shaft 61 is rotatably connected inside the air collecting cavity 5, a rotating paddle 62 and a turntable 63 are respectively sleeved on the front side and the rear side of the surface of the rotating shaft 61, the bottom of the front side of the turntable 63 is rotatably connected with a connecting rod 64, and a connecting rod 65 is bolted inside the other end of the connecting rod 64, and the rear side of the connecting rod 65 penetrates through the inside of the installation frame 41 and is rotatably connected with the screening plate 42. By setting the swing assembly 6, the air collecting cavity 5 is communicated with the air pipe 9, part of the gas in the air pipe 9 enters the air collecting cavity 5 and rises, and pushes the rotating paddle 62 and the rotating shaft 61 to rotate. The turntable 63 on the rotating shaft 61 rotates accordingly, and the turntable 63 drives the screening plate 42 to make a reciprocating swing through the connecting rod 64 and the connecting rod 65. During the swing process, the movement track of the grains on the screen surface becomes complex, increasing the contact and separation opportunities with the sieve mesh. The swing assembly 6 is driven by air flow to make the screening plate 42 swing, change the movement state of the grains, strengthen the screening effect, reduce the phenomenon of particle agglomeration and sieve hole blockage, and improve the screening efficiency and accuracy.

[0042] As Figure 4 shown, the cleaning part 46 includes two support plates 461, the support plates 461 are bolted to the front side and the rear side of the right inner wall of the installation frame 41, and a support roller 462 is rotatably connected between the opposite sides of the two support plates 461. A pushing arm 463 and a swinging arm 464 are respectively welded to the top and the bottom of the support roller 462, and a striking head 465 is arranged on the side of the swinging arm 464 away from the support roller 462, and the striking head 465 and the pushing arm 463 are both used in cooperation with the screening plate 42. By setting the cleaning part 46, when the screening plate 42 contacts the pushing arm 463, the pushing arm 463 pushes the support roller 462 to rotate, drives the swinging arm 464 and the striking head 465 to swing, and the striking head 465 knocks the surface of the screening plate 42 to shake off the grains adhering to the screening plate 42; when the screening plate 42 leaves the pushing arm 463, the support roller 462 resets under the action of gravity and waits for the next cleaning. The setting of the cleaning part 46 plays a role in automatically cleaning the screening plate 42 without manual intervention, reducing the maintenance workload, preventing the sieve holes from being blocked, and ensuring the continuous and stable screening performance of the screening plate 42.

[0043] As Figure 6As shown, the flotation assembly 7 includes an aggregate plate 71. The aggregate plate 71 is bolted to the bottom of the installation frame 41, and a discharge pipe 72 is connected to the bottom of the aggregate plate 71. Guide plates 73 are connected to the bottom of the discharge pipes 72 at the top and in the middle. A guiding shell 74 is bolted inside the guide plate 73, and discharge pipes 75 are connected to the front side and the rear side of the guiding shell 74. The other ends of the discharge pipes 75 extend to the outside of the screening box 1. By providing the flotation assembly 7, the grains screened by the screening assembly 4 fall onto the aggregate plate 71 of the flotation assembly 7 and fall through the discharge pipe 72. During the feeding process, the air flow introduced from the air pipe 9 rises successively through the discharge pipe 72. When part of the air flow is below the aggregate plate 71, under the action of the guide plate 73 and the guiding shell 74, the air flow forms a specific flow field, so that the light impurities and inferior grains are discharged from the screening box 1 through the discharge pipe 75 under the action of the air flow, while the heavier high-quality grains continue to fall for collection. The flotation assembly 7 uses the air flow to realize the sorting of the grain quality, effectively separates the high-quality and inferior grains, improves the overall quality of the cereal grains, and improves the function of the multi-stage screening equipment.

[0044] As Figure 6 shown, both ends of the guide plate 73 are integrally arranged in a spiral shape, and the guiding shell 74 is connected to the guide plate 73. By the spiral guide plate 73, the air flow field is optimized, the separation effect of the flotation assembly 7 on the light impurities and inferior grains is enhanced, the accuracy of the grain quality sorting is improved, and it also restricts the flow path of the air flow, preventing the guided light impurities from re-converging to the flotation position and ensuring the separation quality.

[0045] As Figure 2 shown, fixing plates 14 are bolted to both sides of the air pipe 9, and both sides of the fixing plates 14 are bolted to the inner wall of the aggregate box 2. A connecting pipe 15 is connected to the front side of the air pipe 9, and the connecting pipe 15 is connected to the air collecting cavity 5. Through the fixing and connection design of the air pipe 9, the stable delivery of the air flow is ensured, providing a reliable guarantee for the normal operation of the swing assembly 6 and the flotation assembly 7, and ensuring the stability and continuity of the overall operation of the equipment.

[0046] As Figures 1-6As shown in the figure, the working principle of a cyclic multi-stage fine screening device for cereal crops is as follows: Cereal crops enter from the top of the screening box 1 and first fall on the uniform distribution plate 11. The holes in the uniform distribution plate 11 cause the grains to fall in a water curtain-like manner, avoiding adhesion and facilitating subsequent screening. Then the grains enter the top screening component 4, and the swinging component 6 starts to function. Some of the gas in the air pipe 9 enters the air collecting chamber 5 through the connecting pipe 15. The rising air flow drives the rotating paddle 62 and the rotating shaft 61 to rotate, driving the turntable 63 to rotate. The turntable 63 makes the screening plate 42 swing in a reciprocating cycle within the mounting frame 41 through the connecting rod 64 and the connecting rod 65. The limiting wheels 43 on the front and rear sides of the screening plate 42 roll in the limiting grooves 44, restricting its movement trajectory and making its movement flexible. During this process, the movement trajectory of the grains on the sieve surface becomes complex, increasing the contact and separation opportunities with the sieve mesh and improving the screening efficiency. When the left limiting wheel 43 moves to the position of the lifting block 45, the inclined surface of the lifting block 45 makes the left side of the screening plate 42 gradually tilt upward, and the tilt angle increases. The large-grain grains on the sieve surface slide down under the action of gravity and are discharged from the discharge port 8. During the swinging process of the screening plate 42, it also contacts the cleaning part 46. When the screening plate 42 contacts the pushing arm 463, the pushing arm 463 drives the supporting roller 462 to rotate, driving the swinging arm 464 and the striking head 465 to swing. The striking head 465 strikes the surface of the screening plate 42 to shake off the adhering grains. After the screening plate 42 leaves, the supporting roller 462 resets under the action of gravity to achieve automatic cleaning and prevent the sieve holes from being blocked. The grains screened by the top screening component 4 fall into the middle screening component 4, and the above screening, swinging, and cleaning processes are repeated. During the screening, the air flow introduced by the air pipe 9 rises through the discharge pipe 72 and forms a specific flow field under the action of the spiral guide plate 73 and the guide shell 74, discharging the light impurities and inferior grains through the discharge pipe 75. The high-quality grains continue to fall. Finally, the grains enter the bottom screening component 4 for final screening, and the grains that meet the requirements are discharged from the corresponding discharge port 8, completing the entire cyclic multi-stage fine screening process and achieving high-precision and multi-level screening treatment of cereal crops.

Claims

1. A cyclic multi-stage fine screening device for cereal grain crops, comprising a screening box (1) and an aggregate box (2), characterized in that: The aggregate box (2) is bolted to the bottom of the screening box (1). A multi-stage screening structure (3) is arranged inside the screening box (1). A plurality of discharge ports (8) are bolted to the right side of the screening box (1), and the discharge ports (8) are used in cooperation with the multi-stage screening structure (3). An air pipe (9) is bolted inside the aggregate box (2), and the air pipe (9) is communicated with the multi-stage screening structure (3). The multi-stage screening structure (3) includes a plurality of screening components (4) arranged in a stacked manner. The screening precision of the screening components (4) increases sequentially from top to bottom. An air collecting cavity (5) is bolted to the left side of the front side of the inner wall of the screening box (1), and a plurality of swing components (6) are arranged inside the air collecting cavity (5). One side of the swing component (6) close to the screening component (4) is connected thereto. Flotation components (7) are bolted to the bottoms of the top and middle screening components (4).

2. The circulating multi-stage fine screening device for cereal crops according to claim 1, characterized in that: The screening component (4) includes a mounting frame (41). The mounting frame (41) is bolted inside the screening box (1). A screening plate (42) is slidably arranged inside the mounting frame (41). Limiting wheels (43) are rotatably connected to both sides of the front and rear sides of the screening plate (42). Limiting grooves (44) are formed in the front and rear sides of both sides of the inner wall of the mounting frame (41). The limiting wheels (43) are rollingly arranged inside the limiting grooves (44). Lifting blocks (45) are bolted to the inner walls of the left two limiting grooves (44), and the lifting blocks (45) are used in cooperation with the left limiting wheels (43). A cleaning member (46) is arranged on the right side of the inner wall of the mounting frame (41), and the cleaning member (46) is used in cooperation with the screening plate (42).

3. A cyclic multi-stage fine screening device for cereal crops according to claim 2, characterized in that: A slope is arranged on the right side of the top of the lifting block (45), and the lifting block (45) is used in cooperation with the limiting wheel (43) through the slope.

4. A cyclic multi-stage fine screening device for cereal crops according to claim 2, characterized in that: A fixed frame (10) is bolted to the top inside the screening box (1). A distributing plate (11) is slidably arranged inside the fixed frame (10). Flexible connecting plates (12) are bolted to the front and rear sides of the bottom of the distributing plate (11), and the bottoms of the flexible connecting plates (12) are bolted to the top screening plate (42).

5. A cyclic multi-stage fine screening device for cereal crops according to claim 4, characterized in that: Flexible connecting parts (13) are arranged on the tops of both sides of the distributing plate (11) and the screening plate (42), and one side of the flexible flexible connecting plate (12) close to the inner walls of the fixed frame (10) and the mounting frame (41) is connected to the two respectively.

6. The circulating multi-stage fine screening device for cereal grain crops according to claim 2, characterized in that: The swing component (6) includes a rotating shaft (61). The rotating shaft (61) is rotatably connected inside the air collecting cavity (5). A rotating paddle (62) and a turntable (63) are respectively sleeved on the front and rear sides of the surface of the rotating shaft (61). A connecting rod (64) is rotatably connected to the bottom of the front side of the turntable (63), and a connecting rod (65) is bolted to the inside of the other end of the connecting rod (64). The rear side of the connecting rod (65) penetrates through the inside of the mounting frame (41) and is rotatably connected to the screening plate (42).

7. The circulating multi-stage fine screening device for cereal crops according to claim 2, characterized in that: The cleaning member (46) includes two support plates (461), the support plates (461) are bolted to the front side and the rear side of the inner wall of the right side of the mounting frame (41), and a support roller (462) is rotatably connected between the opposite sides of the two support plates (461). A pushing arm (463) and a swinging arm (464) are respectively welded to the top and the bottom of the support roller (462), and a striking head (465) is arranged on the side of the swinging arm (464) away from the support roller (462). Both the striking head (465) and the pushing arm (463) are used in cooperation with the screening plate (42).

8. A cyclic multi-stage fine screening device for cereal crops according to claim 1, characterized in that: The flotation assembly (7) includes an aggregate plate (71), the aggregate plate (71) is bolted to the bottom of the mounting frame (41), a discharge pipe (72) is communicated with the bottom of the aggregate plate (71), and diversion plates (73) are communicated with the bottoms of the top and middle discharge pipes (72). A guiding shell (74) is bolted inside the diversion plate (73), and discharge pipes (75) are communicated with the front side and the rear side of the guiding shell (74). The other ends of the discharge pipes (75) extend to the outside of the screening box (1).

9. A cyclic multi-stage fine screening device for cereal crops according to claim 8, characterized in that: Both ends of the diversion plate (73) are integrally arranged in a spiral shape, and the guiding shell (74) is communicated with the diversion plate (73).

10. A cyclic multi-stage fine screening device for cereal crops according to claim 1, characterized in that: Fixing plates (14) are bolted to both sides of the air pipe (9), and both sides of the fixing plates (14) are bolted to the inner wall of the aggregate box (2). A connecting pipe (15) is communicated with the front side of the air pipe (9), and the connecting pipe (15) is communicated with the air collecting cavity (5).

Images