Multistage screening and cleaning equipment for grain

Abstract

The utility model relates to the technical field of grain screening, and concretely is grain multistage screening cleaning and impurity removing equipment, including support, the support top is installed with screening bin, still include the air pipe, the end part fixedly installed in the screening bin near loading position is connected, and with outside fan intercommunication, is used for conveying airflow to the screening bin, the utility model integrates three major functions of winnowing dust removal, multistage screening, spray cleaning, and grain is continuously operated from feeding to grading discharge, need not midway transfer order, improves the impurity removing processing efficiency, improves equipment integration degree simultaneously, reduces equipment floor area, through the cooperation of dust removal board and impact boss, the grain can be scattered when colliding with airflow, makes the dust and impurity wrapped in fully exposed, cooperates the dust exhaust through -hole of staggered distribution and realizes the efficient separation of dust and grain, improves the winnowing dust removal effect.

Description

Technical Field

[0001] This utility model relates to the field of grain screening technology, specifically to a multi-stage grain screening, cleaning, and impurity removal equipment. Background Technology

[0002] During harvesting, transportation, and storage, grains inevitably become contaminated with straw fragments, dust, sand, shriveled grains, and heterogeneous particles of uneven size. These impurities not only reduce the appearance and storage stability of the grains but also exacerbate equipment wear and tear during subsequent deep processing steps such as milling and grinding, affecting the quality and safety of the final product. Therefore, screening and impurity removal is an indispensable core process in the post-harvest grain processing, and its processing efficiency and cleanliness directly determine the overall benefits of grain processing.

[0003] Most grain cleaning equipment on the market is single-function, relying solely on vibrating screens for particle size classification. Traditional vibrating screens rely only on the size of the screen holes to classify particles, which cannot effectively remove the floating dust and light straw fragments adhering to the surface of grain particles. A large amount of dust is scattered during the screening operation, which deteriorates the workshop working environment. Some combined impurity removal equipment separates screening and washing into independent processes. The grain is screened first and then transferred to the washing stage. The overall equipment occupies a large area and has a long processing flow, resulting in low production efficiency and high energy consumption and maintenance costs. Utility Model Content

[0004] To address the aforementioned issues, this application provides a multi-stage grain screening, cleaning, and impurity removal device, which solves the problem that screening equipment has a single function and cannot effectively remove floating dust and straw debris adhering to the outside of the grain.

[0005] The technical solution of this utility model is: a multi-stage grain screening, washing, and impurity removal device, comprising: support; A screening chamber is installed above the support frame; An air duct is connected to one end of the screening chamber, and the air outlet direction of the air duct is towards the inside of the screening chamber; A dust removal plate is fixedly installed inside the screening chamber. The surface of the dust removal plate is perpendicular to the air outlet direction of the air duct, so that the grain entering the screening chamber collides with the dust removal plate under the action of airflow. Multiple dust discharge holes are provided, and the multiple dust discharge holes are disposed through the dust removal plate to allow dust separated after the grain collides with the dust removal plate to pass through with the airflow. Multiple collision protrusions are provided, and the multiple collision protrusions are fixedly installed on the dust removal plate and protrude from the surface of the dust removal plate, so that when the grain collides with the dust removal plate, the grain particles that are stuck together are separated and the impurities attached to the surface of the grain are removed. The screening chamber is equipped with a first screening plate and a second screening plate arranged from top to bottom, and both the first screening plate and the second screening plate are inclined. The screening chamber is equipped with a water pipe frame, and the bottom of the water pipe frame is connected to multiple nozzles, which are used to spray water into the screening chamber.

[0006] Specifically, the multiple dust discharge holes and the multiple collision protrusions are staggered on the dust removal plate.

[0007] Specifically, the air outlet of the duct is flat, and the top of the dust removal plate is lower than the top of the air outlet of the duct, so that part of the airflow sent out by the duct can pass through the top of the dust removal plate.

[0008] Specifically, the ends of the first and second screening plates closest to the duct are both higher than the ends furthest from the duct.

[0009] Specifically, a first discharge pipe is connected to the screening chamber, and the first discharge pipe is connected to the end of the first screening plate that is away from the screening chamber.

[0010] Specifically, a second discharge pipe is connected to the screening chamber, and the second discharge pipe is connected to the end of the second screening plate that is away from the screening chamber.

[0011] Specifically, a sludge discharge funnel is connected to the bottom of the screening chamber.

[0012] Specifically, two vibrating parts are fixedly installed on the outside of the screening chamber, and the vibrating parts are used to drive the screening chamber, the first screening plate and the second screening plate to vibrate.

[0013] Specifically, a feeding pipe is connected to the top of the screening chamber, and a sealing cover plate is hinged to the top of the feeding pipe.

[0014] The beneficial effects of this utility model are as follows: (1) This utility model integrates three major functions: air separation and dust removal, multi-stage screening and spray cleaning. The grain can be continuously processed from feeding to grading and discharge without intermediate transfer, which improves the efficiency of impurity removal and processing, while also increasing the integration of the equipment and reducing the equipment footprint.

[0015] (2) By combining the dust removal plate and the collision protrusion, the grain can be broken up when it collides with the airflow, so that the dust and impurities inside are fully exposed. Combined with the staggered dust discharge holes, the dust and grain are efficiently separated, thus improving the dust removal effect of the air classifier.

[0016] (3) This utility model adopts a flat air outlet combined with a dust removal plate structure with a gap at the top, so that the airflow is divided into through-plate airflow and over-top airflow, which not only ensures that the grain and the dust removal plate collide fully, but also quickly carries the scattered dust to the nozzle position, reducing the possibility of dust overflow. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Figure 1 A schematic diagram of the installation of the screening chamber in the multi-stage grain screening, cleaning and impurity removal equipment provided by this utility model; Figure 2 A schematic diagram of the feeding pipe connection for the multi-stage grain screening, washing and impurity removal equipment provided by this utility model; Figure 3 A schematic diagram of the water pipe rack installation for the multi-stage grain screening, washing and impurity removal equipment provided by this utility model; Figure 4 A schematic diagram of the dust removal plate structure of the multi-stage grain screening, cleaning and impurity removal equipment provided by this utility model.

[0019] In the picture: 1. Support frame; 2. Screening bin; 3. Sewage discharge funnel; 4. Vibrating element; 5. Feeding pipe; 6. Air duct; 7. Water pipe frame; 8. Nozzle; 9. First screening plate; 10. Second screening plate; 11. First discharge pipe; 12. Second discharge pipe; 13. Dust removal plate; 14. Dust discharge through hole; 15. Collision protrusion. Detailed Implementation

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the present utility model will be briefly introduced below in conjunction with the accompanying drawings and descriptions of the embodiments or the prior art. Obviously, the following description of the structure of the accompanying drawings is only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. It should be noted that the description of these embodiments is used to help understand this utility model, but does not constitute a limitation on this utility model.

[0021] like Figures 1-4 As shown, this utility model embodiment provides a multi-stage grain screening, cleaning and impurity removal device, including a support 1, which supports the entire device. A screening chamber 2 is installed above the support 1, and the grain dust removal, screening and cleaning processes can be carried out in the screening chamber 2.

[0022] Specifically, a feeding pipe 5 is connected to the top of the screening chamber 2. The feeding pipe 5 is used to add the grain to be processed into the screening chamber 2, and a sealing cover is hinged to the top of the feeding pipe 5. When feeding, the sealing cover can be opened to allow the grain to enter the screening chamber 2 through the feeding pipe 5; during equipment operation, the sealing cover can be closed to reduce the diffusion of dust or water mist inside the screening chamber 2 outward through the feeding pipe 5.

[0023] Specifically, one end of the screening chamber 2 is connected to an air duct 6, with the air outlet of the air duct 6 facing the interior of the screening chamber 2. The air duct 6 can be connected to an external air supply device to deliver airflow into the screening chamber 2. When the grain enters the screening chamber 2 through the feeding pipe 5, the airflow acts on the falling grain, causing the grain to move laterally along the direction of the airflow during its descent.

[0024] Furthermore, the air vents of the air duct 6 located inside the screening chamber 2 are flat, so that the airflow output from the air duct 6 can form an airflow area distributed along the width of the screening chamber 2, thereby increasing the contact range between the airflow and the falling grain, which is conducive to the grain moving more dispersedly into the screening chamber 2.

[0025] Specifically, a dust removal plate 13 is fixedly installed inside the screening chamber 2, and the surface of the dust removal plate 13 is perpendicular to the air outlet direction of the air duct 6. The dust removal plate 13 is positioned on the movement path of the grain after it is subjected to the airflow from the air duct 6, so that the grain can collide with the surface of the dust removal plate 13 under the action of the airflow.

[0026] When the grain collides with the dust removal plate 13, the grain particles are subjected to instantaneous impact, and the dust and light impurities attached to the surface of the grain can be removed from the surface of the grain, so that the grain particles are initially separated from some of the dust and light impurities.

[0027] Furthermore, the top of the dust collector plate 13 is lower than the top of the air outlet of the air duct 6, allowing some of the airflow from the air duct 6 to pass through the top of the dust collector plate 13. This structure allows a portion of the airflow carrying dust or light impurities to bypass the top of the dust collector plate 13 and continue flowing into the screening chamber 2, thereby reducing the overall obstruction effect of the dust collector plate 13 on the airflow.

[0028] Specifically, the dust removal plate 13 is provided with multiple dust discharge holes 14, which are used to allow dust that detaches from the grain surface after colliding with the dust removal plate 13 to pass through with the airflow. As a result, the airflow carrying dust and light impurities can move to the other side of the dust removal plate 13 through the multiple dust discharge holes 14, so that the movement path of the dust is separated from the grain particles that move downward after the collision.

[0029] In one alternative embodiment, the specific shape of the dust removal through-hole 14 can be selected according to the type of grain to be processed and the required airflow rate. For example, circular holes, strip holes, or other through-hole structures that allow airflow and fine impurities to pass through can be used. While ensuring normal collision and falling of the grain, the airflow capacity on both sides of the dust removal plate 13 can be changed by adjusting the size and number of the dust removal through-holes 14.

[0030] Specifically, multiple collision protrusions 15 are fixedly installed on the dust removal plate 13, and the multiple collision protrusions 15 protrude from the surface of the dust removal plate 13. When the grain hits the dust removal plate 13, some of the grain collides directly with the surface of the dust removal plate 13, and some of the grain collides with the protruding collision protrusions 15, so that the grain is subjected to collision action at collision positions with different protrusion heights.

[0031] The raised structure formed between the collision bump 15 and the dust removal plate 13 increases the degree of disturbance during the grain collision process. For grains that are stuck together and form clumps, the collision action can promote the separation of grain particles; for impurities such as dust and light straw fragments that are attached to the surface of the grain or mixed inside the grain clumps, the impact and disturbance generated by the collision can promote the corresponding impurities to detach from the grain surface.

[0032] Specifically, multiple dust discharge holes 14 and multiple collision protrusions 15 are staggered on the dust removal plate 13. The staggered distribution allows different areas of the dust removal plate 13 to form collision areas and airflow passage areas respectively. After the grain collides with the surface of the dust removal plate 13, the generated dust and light impurities can enter the dust discharge holes 14 nearby and pass through the dust removal plate 13 under the action of airflow, which helps to reduce the re-adhesion of separated dust to the grain surface.

[0033] In the above embodiment, after the grain to be processed enters the screening chamber 2 through the feeding pipe 5, the airflow output from the air duct 6 acts on the falling grain, causing the grain to move in the direction of the dust removal plate 13. After the grain hits the dust removal plate 13 and the collision protrusion 15, the grain particles that are stuck together can be broken up, and the dust and light impurities attached to the surface of the grain and mixed inside the grain clumps can be peeled off. The peeled dust and light impurities pass through the dust discharge hole 14 or pass through the top of the dust removal plate 13 with the airflow, while the grain particles blocked by the dust removal plate 13 move to the lower part of the screening chamber 2 under the action of gravity, thereby achieving the initial separation of grain from dust and light impurities.

[0034] Specifically, a first screening plate 9 and a second screening plate 10 are arranged from top to bottom inside the screening chamber 2. Both the first screening plate 9 and the second screening plate 10 are inclined, and the end of the first screening plate 9 and the second screening plate 10 that is closer to the air duct 6 is higher than the end that is farther away from the air duct 6.

[0035] After the grain has undergone collision dust removal, it falls onto the first screening plate 9 under the action of gravity. Since the first screening plate 9 is inclined, the end closer to the air duct 6 is higher in the vertical direction than the end farther away from the air duct 6. The grain remaining on the first screening plate 9 can move gradually from the higher end to the lower end along the first screening plate 9; grain particles or impurities that can pass through the screen holes of the first screening plate 9 fall down to the second screening plate 10.

[0036] The second screening plate 10 further screens the material falling from the first screening plate 9. The material remaining on the second screening plate 10 moves along the second screening plate 10 to its lower end. Fine impurities that can pass through the second screening plate 10 continue to move towards the bottom of the screening chamber 2. Thus, continuous screening is achieved by using the first screening plate 9 and the second screening plate 10 arranged in a vertical direction.

[0037] In one optional embodiment, the sieve aperture sizes of the first screening plate 9 and the second screening plate 10 can be set according to the particle size of the grain being processed and the particle size of the impurities to be separated. For example, the sieve aperture size of the first screening plate 9 can be larger than that of the second screening plate 10, so that the first screening plate 9 and the second screening plate 10 form a screening structure with different particle size ranges. The above-mentioned sieve aperture size relationship is an embodiment that can be selected according to the actual grain variety and screening requirements, and does not limit the first screening plate 9 and the second screening plate 10 to adopt specific sieve aperture sizes.

[0038] Specifically, a first discharge pipe 11 is connected to the screening chamber 2, and the first discharge pipe 11 is connected to the end of the first screening plate 9 away from the screening chamber 2. When the grain moves to the lower end of the first screening plate 9 along the inclined direction, it can enter the first discharge pipe 11 and be discharged from the screening chamber 2 through the first discharge pipe 11.

[0039] In actual use, a collection container can be set below the first discharge pipe 11 to collect the material discharged through the first discharge pipe 11.

[0040] Specifically, a second discharge pipe 12 is also connected to the screening chamber 2, and the second discharge pipe 12 is connected to the end of the second screening plate 10 away from the screening chamber 2. The grain that remains on the second screening plate 10 moves along the lower end of the second screening plate 10 and can enter the second discharge pipe 12, and be discharged from the screening chamber 2 through the second discharge pipe 12.

[0041] In actual use, a corresponding collection container can be set below the second discharge pipe 12 to collect the materials obtained after being screened by different screening plates.

[0042] Specifically, two vibrating parts 4 are fixedly installed on the outside of the screening chamber 2. The vibrating parts 4 are vibration motors, model YZS series. When the vibrating parts 4 are running, they can drive the screening chamber 2 to vibrate, and cause the first screening plate 9 and the second screening plate 10 set inside the screening chamber 2 to vibrate together with the screening chamber 2.

[0043] The vibration can cause the grain on the first screening plate 9 and the second screening plate 10 to continuously undergo small displacements, reducing the situation where the grain stays in the screen hole position for a long time and causes the screen hole to become blocked. At the same time, it can promote the grain to move along the inclined first screening plate 9 and the second screening plate 10 to their respective lower ends, improving the continuity of the screening process.

[0044] In one alternative embodiment, the two vibrating units 4 can be disposed on opposite sides of the screening chamber 2 to ensure that the vibration force is transmitted to the screening chamber 2 more evenly. The vibrating units 4 can be vibration drive structures capable of generating mechanical vibration, and their specific structures can be selected according to the size of the screening chamber 2, the grain processing capacity, and the required vibration intensity.

[0045] Specifically, a sludge discharge funnel 3 is connected to the bottom of the screening chamber 2. The sludge discharge funnel 3 is used to collect and discharge fine impurities that fall to the bottom of the screening chamber 2, as well as wastewater generated during the cleaning process. When the sludge discharge funnel 3 adopts a structure with a larger opening at the top and gradually narrowing downwards, the dirt at the bottom of the screening chamber 2 can be collected towards the lower outlet of the sludge discharge funnel 3 under the action of gravity for centralized discharge.

[0046] Specifically, a water pipe frame 7 is installed inside the screening chamber 2, and multiple nozzles 8 are connected to the bottom of the water pipe frame 7. The water pipe frame 7 can be connected to an external water supply device, so that the cleaning water enters the water pipe frame 7 and is delivered to the multiple nozzles 8, and the multiple nozzles 8 spray water into the screening chamber 2.

[0047] The nozzle 8 can spray water towards the area where the first screening plate 9 and / or the second screening plate 10 are located, so that the water comes into contact with the grain on the screening plate. As the grain moves and vibrates on the screening plate, it is washed by the water flow, which can further remove impurities attached to the surface of the grain that are not easily removed by airflow collision alone.

[0048] At the same time, the water jet or water mist sprayed from the nozzle 8 can come into contact with some of the dust suspended in the screening chamber 2, making the dust wet and settle downwards, thereby reducing the continuous suspension of dust inside the screening chamber 2 during the screening process.

[0049] The washing water, carrying fine impurities, passes through the first screening plate 9 and the second screening plate 10 and flows towards the bottom of the screening chamber 2, eventually converging into the wastewater discharge funnel 3 and being discharged through it. In practical applications, the lower outlet of the wastewater discharge funnel 3 can be connected to an external wastewater collection or treatment device for centralized treatment of the washing wastewater and fine impurities.

[0050] In the above embodiment, when the equipment is running, the air duct 6 is first put into the air supply state, and the water pipe rack 7 is put into the water supply state according to whether water washing is required. At the same time, the vibration unit 4 is started. The sealing cover plate at the top of the feeding pipe 5 is opened, and the grain to be processed is put into the screening chamber 2 through the feeding pipe 5. After feeding is completed, the sealing cover plate can be closed.

[0051] As the grain enters the screening chamber 2, it is propelled towards the dust removal plate 13 by the airflow from the duct 6 during its descent. Upon collision with the dust removal plate 13 and the collision protrusions 15, the grain particles that are stuck together are dispersed, and dust and light impurities adhering to the grain surface and mixed within the grain clumps are detached from the grain. The separated dust and light impurities are carried by the airflow through the dust discharge hole 14 or pass through the top of the dust removal plate 13, while the grain, blocked by the dust removal plate 13, falls downwards to the first screening plate 9.

[0052] After the grain falls onto the first screening plate 9, it moves towards the lower end of the first screening plate 9 under the action of gravity and vibration generated by the vibrating part 4. The material remaining on the first screening plate 9 is discharged through the first discharge pipe 11, while the material that can pass through the first screening plate 9 falls onto the second screening plate 10 for further screening.

[0053] Grain or other materials falling onto the second screening plate 10 move towards the lower end of the second screening plate 10 under vibration. Materials remaining on the second screening plate 10 are discharged through the second discharge pipe 12. Fine impurities that can pass through the second screening plate 10 continue to move towards the bottom of the screening bin 2.

[0054] When grain needs to be washed, the water pipe frame 7 supplies water to multiple nozzles 8. The nozzles 8 spray and wash the grain during the screening process, further removing impurities adhering to the surface of the grain, and at the same time causing some suspended dust in the screening chamber 2 to settle. The wastewater and fine impurities generated during washing collect at the bottom of the screening chamber 2 and are then discharged through the drain funnel 3.

[0055] Thus, after the grain enters the screening chamber 2, it can sequentially undergo collision dust removal under the action of airflow, continuous screening by the first screening plate 9 and the second screening plate 10, and spray cleaning by the nozzle 8, so that the dust, light impurities and fine impurities on the surface of the grain are separated, and the materials at different screening positions are discharged through the first discharge pipe 11 and the second discharge pipe 12 respectively, realizing the continuous operation of the grain screening, cleaning and impurity removal process.

[0056] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A multi-stage grain screening, washing, and impurity removal equipment, characterized in that, include: Support (1); The screening chamber (2) is installed above the support (1); A duct (6) is connected to one end of the screening chamber (2), and the air outlet direction of the duct (6) is towards the interior of the screening chamber (2); A dust removal plate (13) is fixedly installed inside the screening chamber (2). The surface of the dust removal plate (13) is perpendicular to the air outlet direction of the air duct (6) so that the grain entering the screening chamber (2) collides with the dust removal plate (13) under the action of airflow. Multiple dust discharge holes (14) are provided, and the multiple dust discharge holes (14) are provided through the dust removal plate (13) to allow the dust separated after the grain collides with the dust removal plate (13) to pass through with the airflow; Multiple collision bumps (15) are provided. The multiple collision bumps (15) are fixedly provided on the dust removal plate (13) and protrude from the surface of the dust removal plate (13) so that when the grain collides with the dust removal plate (13), the grain particles that are stuck together are separated and the impurities attached to the surface of the grain are removed. The screening chamber (2) is provided with a first screening plate (9) and a second screening plate (10) from top to bottom. Both the first screening plate (9) and the second screening plate (10) are inclined. A water pipe rack (7) is installed inside the screening chamber (2), and multiple nozzles (8) are connected to the bottom of the water pipe rack (7). The multiple nozzles (8) are used to spray water into the screening chamber (2).

2. The multi-stage grain screening, washing, and impurity removal equipment as described in claim 1, characterized in that: Multiple dust discharge holes (14) and multiple collision protrusions (15) are staggered on the dust removal plate (13).

3. The multi-stage grain screening, washing, and impurity removal equipment as described in claim 1, characterized in that: The air outlet of the air duct (6) is flat, and the top of the dust removal plate (13) is lower than the top of the air outlet of the air duct (6) so that part of the airflow sent out by the air duct (6) can pass through the top of the dust removal plate (13).

4. The multi-stage grain screening, washing, and impurity removal equipment as described in claim 1, characterized in that: The ends of the first screening plate (9) and the second screening plate (10) near the air duct (6) are both higher than the ends away from the air duct (6).

5. The multi-stage grain screening, washing, and impurity removal equipment as described in claim 4, characterized in that: The screening chamber (2) is connected to a first discharge pipe (11), which is connected to the end of the first screening plate (9) that is away from the screening chamber (2).

6. The multi-stage grain screening, washing, and impurity removal equipment as described in claim 4, characterized in that: The screening chamber (2) is connected to a second discharge pipe (12), which is connected to the end of the second screening plate (10) that is away from the screening chamber (2).

7. The multi-stage grain screening, washing, and impurity removal equipment as described in claim 1, characterized in that: The bottom of the screening chamber (2) is connected to a sewage discharge funnel (3).

8. The multi-stage grain screening, washing, and impurity removal equipment as described in claim 4, characterized in that: Two vibration parts (4) are fixedly installed on the outside of the screening chamber (2). The vibration parts (4) are used to drive the screening chamber (2), the first screening plate (9) and the second screening plate (10) to vibrate.

9. The multi-stage grain screening, washing, and impurity removal equipment as described in claim 1, characterized in that: The top of the screening chamber (2) is connected to a feeding pipe (5), and the top of the feeding pipe (5) is hinged to a sealing cover.

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