Highly efficient and environmentally friendly grain screening equipment

Abstract

This utility model belongs to the technical field of grain screening equipment, specifically relating to a high-efficiency and environmentally friendly grain screening device, including a box body with a box cover on the upper side. A dust removal component is mounted on the box cover, comprising a dust removal screen fixedly connected to the box body, an exhaust fan at the upper end of the dust removal screen, a dust removal chamber above the exhaust fan, a filter cloth inside the dust removal chamber, activated carbon at the upper end of the filter cloth, an air outlet above the activated carbon, and a dust removal chamber cover on one side of the dust removal chamber. A gasket is provided on the upper inner wall of the box body, and a screen assembly is located on one side of the gasket. An air guide pipe is located below the screen assembly, and two rows of air jet nozzles are mounted on the air guide pipe. This utility model uses a combination of double-row air jet nozzles to create a pulsed airflow covering the entire area of ​​the screen. Combined with an alloy tool steel scraper that fits between the scraper and the screen, it achieves dual cleaning through physical scraping and airflow impact.

Description

Technical Field

[0001] This utility model belongs to the technical field of grain screening equipment, specifically relating to a high-efficiency and environmentally friendly grain screening device. Background Technology

[0002] Existing grain screening equipment suffers from the following technical defects: traditional screening equipment lacks an effective unclogging mechanism, allowing dust and fine impurities to easily adhere to the screen openings, leading to decreased screening efficiency (e.g., CN218989345U relies solely on vibration for cleaning, with limited effectiveness); a large amount of dust is generated during the screening process, and existing dust removal devices are mostly single-filter structures, which are incomplete in collecting fine dust (e.g., CN216540321U uses a simple bag filter, making it difficult to meet emission standards); single-drum screening cannot simultaneously remove light impurities (straw, broken leaves) and heavy impurities (pebbles, clods), requiring multiple stages of equipment connected in series, resulting in a large footprint. Therefore, there is an urgent need for a new type of equipment that integrates high-efficiency screening, automatic unclogging, and environmentally friendly dust removal. Utility Model Content

[0003] In view of the above-mentioned shortcomings in the existing technology, the present invention provides a highly efficient and environmentally friendly grain screening device to solve the problems in the background technology.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] A high-efficiency and environmentally friendly grain screening device includes a box body with a cover on the upper side. A dust removal component is mounted on the cover, comprising a dust removal screen fixedly connected to the box body, an exhaust fan at the upper end of the screen, a dust collection box above the exhaust fan, a filter cloth inside the dust collection box, activated carbon at the upper end of the filter cloth, an air outlet above the activated carbon, and a dust collection box cover on one side. A gasket is provided on the upper inner wall of the box body, a screen assembly is located on one side of the gasket, an air guide pipe is located below the screen assembly, two rows of air nozzles are provided on the air guide pipe, a first scraper is located on one side of the screen assembly, and a second scraper is located on the other side of the screen assembly. A feed inlet is located on one side of the box body, a slag outlet is located below the feed inlet, and a discharge outlet is located on the lower side of the box body.

[0006] Furthermore, the screen assembly includes a mounting plate on the outside of the housing, a motor on the mounting plate, a stirring shaft connected to the motor output shaft, stirring blades on the stirring shaft, a drum screen on the stirring blades, and the stirring blades located inside the drum screen.

[0007] Furthermore, the box body is fixedly connected to the first scraper, the box body is fixedly connected to the second scraper, and the scraper blade is connected to the gap between the scraper blade and the drum screen.

[0008] Furthermore, both sides of the box are provided with fixing plates, and bearings are bolted to the fixing plates. The stirring shaft passes through the bearings, and the box is fixedly connected to the air guide pipe.

[0009] Furthermore, the air guide tube is a seamless steel pipe, and the upper air nozzle of the two rows of air nozzles is tilted upward at 30 degrees, while the lower air nozzle is tilted downward at 10 degrees.

[0010] Furthermore, the drum screen is fixedly connected to the stirring shaft, the stirring blades are spiral blades, the gap between the stirring blades and the drum screen is 1-2mm, and the first scraper and the second scraper are made of alloy tool steel.

[0011] Furthermore, the dust collector and its cover are quick-release connected, and a silicone sealing ring is used to press the dust collector and its cover together.

[0012] Compared with the prior art, this utility model has the following advantages:

[0013] By combining a 30-degree upward-tilting and a 10-degree downward-tilting double-row jet nozzle (pressure 0.5-0.8MPa), a pulsed airflow covering the entire screen area is formed, which shakes off stuck particles and improves efficiency. With the alloy tool steel scraper and the screen gap (1-2mm), a dual cleaning of physical scraping and airflow impact is achieved to solve the problem of wet grain blockage.

[0014] Built-in spiral blades force agitation (1-2mm gap between the outer edge of the blades and the screen), which increases the axial propulsion speed of the material, improves the grain screening rate, reduces the impurity residue rate, and significantly reduces subsequent cleaning costs.

[0015] The dust removal system employs a three-stage filtration process: "dust netting intercepts large dust particles → filter cloth captures fine dust particles → activated carbon adsorbs odors." Combined with the negative pressure adsorption of the exhaust fan, this process can completely collect and treat the dust generated during the screening process, preventing fugitive emissions. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural schematic diagram of a high-efficiency and environmentally friendly grain screening device according to the present invention.

[0017] Figure 2 This is a cross-sectional view of a high-efficiency and environmentally friendly grain screening device according to this utility model.

[0018] Figure 3 This is a schematic diagram of the cleaning components of a high-efficiency and environmentally friendly grain screening device according to this utility model;

[0019] Figure 4 This is a schematic diagram of the dust removal components;

[0020] The reference numerals in the accompanying drawings of the instruction manual include: 1. Box body; 2. Motor; 21. Mounting plate; 3. Feed inlet; 4. Drum screen; 5. Dust removal assembly; 51. Exhaust fan; 52. Dust removal box; 53. Filter cloth; 54. Activated carbon; 55. Dustproof net; 56. Dust removal box cover; 6. Slag discharge pipe; 7. Stirring shaft; 8. Stirring blades; 9. Air guide pipe; 10. Discharge port; 11. First scraper; 12. Second scraper; 13. Air nozzle; 14. Gasket; 15. Fixing plate; 16. Box cover. Detailed Implementation

[0021] To enable those skilled in the art to better understand this utility model, the technical solution of this utility model will be further described below in conjunction with the accompanying drawings and embodiments.

[0022] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual images. They should not be construed as limiting the scope of this patent. To better illustrate the embodiments of this utility model, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0023] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," "right," "inner," and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0024] In the description of this utility model, unless otherwise explicitly specified and limited, the term "connection" or similar designation indicating the connection relationship between components should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0025] Example 1:

[0026] like Figure 1-4As shown, this utility model discloses a high-efficiency and environmentally friendly grain screening device, including a box body 1, a box cover 16 on the upper side of the box body 1, a dust removal component 5 on the box cover 16, a dust removal net 55 fixedly connected to the box body 1, an exhaust fan 51 at the upper end of the dust removal net 55, a dust removal box 52 at the upper end of the exhaust fan 51, a filter cloth 53 inside the dust removal box 52, activated carbon 54 at the upper end of the filter cloth 53, an air outlet above the activated carbon 54, and a dust removal box cover 56 on one side of the dust removal box 52; a gasket 14 is provided on the upper inner wall of the box body 1, a screen assembly is provided on one side of the gasket 14, an air guide pipe 9 is provided on the lower side of the screen assembly, two rows of air nozzles 13 are provided on the air guide pipe 9, a first scraper 11 is provided on one side of the screen assembly, and a second scraper 12 is provided on the other side of the screen assembly; a feed inlet 3 is provided on one side of the box body 1, a slag outlet pipe 6 is provided below the feed inlet 3, and a discharge outlet 10 is provided on the lower side of the box body 1.

[0027] The screen assembly includes a mounting plate 21 on the outside of the housing 1, a motor 2 on the mounting plate 21, a stirring shaft 7 connected to the output shaft of the motor 2, stirring blades 8 on the stirring shaft 7, a drum screen 4 on the stirring blades 8, and the stirring blades 8 located inside the drum screen 4.

[0028] Specifically, it can push the grain evenly along the axial direction, avoiding local accumulation and ensuring full contact between the grain and the screen.

[0029] The housing 1 is fixedly connected to the first scraper 11, and the housing 1 is fixedly connected to the second scraper 12. The scraper blade is gapped between itself and the drum screen 4. Specifically, the gap between the blade and the drum screen 4 is 1-2mm, which can effectively remove residual impurities attached to the screen surface, further ensuring the purity of the grain after screening and reducing the impact of impurities on subsequent processing.

[0030] Both sides of the housing 1 are provided with fixing plates 15, and bearings are bolted to the fixing plates 15. The stirring shaft 7 passes through the bearings, and the housing 1 is fixedly connected to the air guide pipe 9.

[0031] Specifically, the bearings are bolted to the fixed plates on both sides of the box, and the stirring shaft passes through the bearings to form a rigid support structure. At the same time, the bearings ensure that the concentricity error between the stirring shaft and the drum screen is ≤0.1mm, avoiding screen wear or vibration noise caused by eccentricity.

[0032] The air duct 9 is a seamless steel pipe. The upper air nozzle 13 of the two rows of air nozzles 13 is tilted upward at 30 degrees, and the lower air nozzle 13 is tilted downward at 10 degrees.

[0033] Specifically, the 30-degree upward tilt angle allows the airflow to directly sweep away residual impurities (such as grain fragments) on the inner surface of the screen, while the 10-degree downward tilt angle specifically removes dust adhering to the outer surface of the screen, creating a "double attack" effect to clear blockages and reduce screen hole clogging.

[0034] The drum screen 4 is fixedly connected to the stirring shaft 7. The stirring blade 8 is a spiral blade. The stirring blade 8 and the drum screen 4 are fitted with a clearance. The first scraper 11 and the second scraper 12 are made of alloy tool steel.

[0035] Specifically, the rotating helical blades push the grain axially and disperse it through the helical structure, avoiding local accumulation and improving screening uniformity. The gap between the blades and the screen is 1-2mm to prevent wear caused by friction between the blades and the screen, thus extending the life of both.

[0036] The dust collector 52 and the dust collector cover 56 are connected by a quick-release mechanism, and a silicone sealing ring is used to press the dust collector 52 and the dust collector cover 56 together. Specifically, the quick-release connection allows for quick opening of the dust collector to replace the filter cloth or activated carbon, reducing maintenance time; the silicone sealing ring forms a seal after being pressed together, preventing untreated dust-laden gas from leaking out of the gaps.

[0037] Operating principle: The fixed plate 15 is welded to the housing 1, and the bearing seat is fixed to the fixed plate 15 with M12 bolts to ensure the concentricity of the stirring shaft 7. The drum screen 4 is made of 304 stainless steel woven mesh, and the mesh diameter is customized according to the screening requirements. It is fixedly connected to the stirring shaft 7 through a flange. The air guide pipe 9 has an outer diameter of 57mm and a wall thickness of 3.5mm. The air nozzle 13 is made of brass with an inner diameter of 6mm and is threaded to the air guide pipe 9. The dust removal screen 55 is made of stainless steel sintered mesh and is connected to the housing 1 through clips. The filter cloth 53 is made of antistatic needle-punched felt, and the activated carbon 54 is made of columnar particles φ3-5mm with a filling height of 300mm.

[0038] Grain enters the drum screen 4 through the feed inlet 3. The motor 2 drives the stirring shaft 7 to rotate. The spiral blades 8 stir and transport the grain towards the slag discharge pipe 6. Qualified fine particles fall into the discharge outlet 10 through the screen holes, while large impurities are discharged from the slag discharge pipe 6.

[0039] The air duct 9 continuously supplies air, and the bidirectional jet nozzle 13 blows the inner and outer surfaces of the screen to remove dust that clogs the screen holes; the first scraper 11 and the second scraper 12 scrape off impurities on the screen surface, and the impurities are discharged through the slag discharge pipe 6; the exhaust fan 51 creates a -50Pa micro negative pressure inside the housing 1, and after the dust is intercepted by the dust removal net 55, the dust passes through the filter cloth 53 and activated carbon 54 in sequence for purification, and the qualified air is discharged from the air outlet.

[0040] The above are merely embodiments of this utility model. The circuits, electronic components, and modules involved are all prior art, fully achievable by those skilled in the art, and require no further explanation. The content protected by this application does not involve improvements to the software and methods. Commonly known structures and characteristics in the solution are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field to which this utility model pertains prior to the application date or priority date, are able to access all existing technologies in that field, and possess the ability to apply conventional experimental methods prior to that date. Those skilled in the art can, under the guidance of this application, improve and implement this solution in conjunction with their own capabilities. Some typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of this utility model. These should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent.

Claims

1. A highly efficient and environmentally friendly grain screening device, characterized in that: The enclosure includes a housing (1), with a cover (16) on the upper side. A dust removal assembly (5) is mounted on the cover (16). The dust removal assembly (5) includes a dust removal screen (55) fixedly connected to the housing (1). An exhaust fan (51) is mounted on the upper end of the dust removal screen (55). A dust collection box (52) is mounted on the upper end of the exhaust fan (51). A filter cloth (53) is installed inside the dust collection box (52). Activated carbon (54) is mounted on the upper end of the filter cloth (53). An air outlet is located above the activated carbon (54). The dust collection box (52)... A dust collector cover (56) is provided on the side; a gasket (14) is provided on the upper inner wall of the box (1), a screen assembly is provided on one side of the gasket (14), an air guide pipe (9) is provided on the lower side of the screen assembly, two rows of air nozzles (13) are provided on the air guide pipe (9), a first scraper (11) is provided on one side of the screen assembly, and a second scraper (12) is provided on the other side of the screen assembly; a feed inlet (3) is provided on one side of the box (1), a slag outlet pipe (6) is provided on the lower side of the feed inlet (3), and a discharge outlet (10) is provided on the lower side of the box (1).

2. The efficient and environmentally friendly grain screening equipment as described in claim 1, characterized in that: The screen assembly includes an installation plate (21) on the outside of the housing (1), a motor (2) on the installation plate (21), a stirring shaft (7) connected to the output shaft of the motor (2), stirring blades (8) on the stirring shaft (7), a drum screen (4) on the stirring blades (8), and the stirring blades (8) located inside the drum screen (4).

3. The efficient and environmentally friendly grain screening equipment as described in claim 1, characterized in that: The box body (1) is fixedly connected to the first scraper (11), and the box body (1) is fixedly connected to the second scraper (12). The scraper blade is gap-connected to the drum screen (4).

4. The efficient and environmentally friendly grain screening equipment as described in claim 1, characterized in that: The box (1) is provided with fixing plates (15) on both sides. The fixing plates (15) are bolted with bearings, and the stirring shaft (7) passes through the bearings. The box (1) is fixedly connected to the air guide pipe (9).

5. The efficient and environmentally friendly grain screening equipment as described in claim 1, characterized in that: The air duct (9) is a seamless steel pipe. The upper air nozzle (13) of the two rows of air nozzles (13) is tilted upward at 30 degrees and the lower air nozzle (13) is tilted downward at 10 degrees.

6. The efficient and environmentally friendly grain screening equipment as described in claim 2, characterized in that: The drum screen (4) is fixedly connected to the stirring shaft (7), the stirring blade (8) is a spiral blade, the stirring blade (8) and the drum screen (4) are in clearance fit, and the first scraper (11) and the second scraper (12) are made of alloy tool steel.

7. The efficient and environmentally friendly grain screening equipment as described in claim 1, characterized in that: The dust collector (52) and the dust collector cover (56) are connected by a quick-release mechanism, and a silicone sealing ring is used to press the dust collector (52) and the dust collector cover (56) together.

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