Sieving and impurity removing equipment for grains

Abstract

The invention relates to the technical field of grain processing equipment, in particular to grain sieving and impurity removing equipment which comprises a rack, a grain sieving frame is mounted in the rack, and a vibration motor used for driving the grain sieving frame to vibrate is mounted on one side of the rack; the top of the rack is fixedly connected with a layered feeding assembly for conveying grains to the grain screening frame at different heights, and a drying assembly for dispersing and air-drying the grains is installed between the grain screening frame and the layered feeding assembly. The drying assembly comprises a limiting frame fixedly connected with the rack, a hot air pipeline for conveying hot air into the limiting frame is arranged on one side of the limiting frame, the inner wall of the limiting frame is fixedly connected with a guide plate for guiding the hot air to flow along the inner wall of the limiting frame, and a center dispersing assembly is installed in the center of the limiting frame. The problems that an existing grain screening device is poor in screening effect on grain which is large in size due to adhesion caused by moisture, and the overall size is difficult to reduce are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of grain processing equipment, and particularly to a sieving and impurity removing device for grains. Background Art

[0002] When grains are harvested, they often contain impurities such as stones and sand grains, which affect the overall quality of the grains. A grain screening machine is needed to screen and separate large impurities such as stones and sand grains in the grains. Currently, general grain screening machines are generally used to screen dry grains, and there are few that can screen wet grains. After retrieval, a Chinese invention patent with the application number CN202411434017.8 discloses an anti-blocking grading sieve device and method. By setting a blower, an air heater, an air delivery pipe, a heating sleeve, in cooperation with a screening tank, an impurity removing tank, and a material delivery pipe, it is convenient to heat and dry the screened rice to prevent the rice from sticking due to excessive moisture.

[0003] The above device has limited dispersion effect on sticky grains by using wind power. Therefore, a relatively long heating and drying path is required to gradually dry the grains from the outer layer to the inner layer. When the sticky volume of the grains is large, the drying effect on the grains will become poor, and it also greatly increases the space occupied by the grain screening equipment. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the present invention provides a sieving and impurity removing device for grains, which solves the problems that the existing grain screening equipment has poor screening effect on wet grains with large sticky volume and is difficult to reduce the overall volume.

[0005] To achieve the above object, the present invention provides the following technical solution: A sieving and impurity removing device for grains, including a frame. Inside the frame, a grain screening frame is installed. On one side of the frame, a vibration motor for driving the grain screening frame to vibrate is installed. At the top of the frame, a layered feeding component for conveying grains to the grain screening frame at different heights is fixedly connected. Between the grain screening frame and the layered feeding component, a drying component for dispersing and air-drying the grains is installed;

[0006] The drying component includes a limiting frame fixedly connected to the frame. On one side of the limiting frame, a hot air pipe for conveying hot air into its interior is provided. Inside the inner wall of the limiting frame, a guiding plate for guiding the hot air to flow along its inner wall is fixedly connected. At the center of the limiting frame, a central dispersing component for rotating and hitting to disperse agglomerated grains and absorbing the hot air into its interior to dry the contacted grains is installed. The temperature of the hot air is 50°C - 80°C.

[0007] Preferably, the central dispersion component includes a horizontal plate fixedly connected to the limit frame, a rotating rod movably passing through the horizontal plate is provided at the bottom of the horizontal plate, a plurality of horizontal rods are fixedly connected to the outside of the rotating rod, an elliptical ball is fixedly connected to the horizontal rod, the interiors of the rotating rod, the horizontal rod and the elliptical ball are all hollow, an exhaust port is opened at the top of the rotating rod, the opening is on the side of the elliptical ball away from the rotating rod.

[0008] Preferably, a mounting plate 1 is fixedly connected to one side of the frame, a motor 1 is fixedly connected to the bottom of the mounting plate 1, a belt 1 is transmission-connected between the motor 1 and the rotating rod, and a protective frame 1 for protecting the belt 1 is installed on the top of the frame.

[0009] Preferably, the limiting frame comprises a square frame close to one side of the layered loading assembly, a semicircular frame is fixedly connected to the side of the square frame away from the layered loading assembly, and the top of the semicircular frame extends to the same height as the highest point of the layered loading assembly.

[0010] Preferably, the guide plate comprises a short plate installed on the inner wall of the semicircular frame and facing the axis thereof, an inclined plate is fixedly connected to a side of the short plate away from the semicircular frame, and a ventilation slot is provided at the bottom of the short plate.

[0011] Preferably, the layered feeding assembly includes a transverse frame fixedly connected to the frame, the inner bottom of the transverse frame is an inclined surface, a notch is provided on the side of the transverse frame close to the drying assembly, an elastic swing assembly is installed inside the notch, arc-shaped plates for guiding the grain to move toward the notch are fixedly connected on both sides of the inner wall of the transverse frame, a limiting assembly for pushing the elastic swing assembly to different angles is installed at one end of the transverse frame close to the drying assembly, and a height adjustment assembly is installed inside the transverse frame close to the arc plate.

[0012] Preferably, the elastic swing assembly includes a swing plate rotatably connected to the transverse frame, a baffle is fixedly connected to the bottom of the transverse frame, a spring is fixedly connected between the baffle and the swing plate, and a protective plate for covering the gap between the swing plate and the transverse frame is fixedly connected to one side of the inner wall of the notch.

[0013] Preferably, the limiting assembly comprises a round rod rotatably connected to the inner wall of the transverse frame, a plurality of side plates of different widths are fixedly connected to the outer side of the round rod, a shovel plate is fixedly connected to the side of the side plate away from the round rod, and the shovel plate is an arc-shaped plate.

[0014] Preferably, one side of the frame is fixedly connected to a mounting plate 2, one side of the mounting plate 2 is fixedly connected to a motor 2, one end of the round rod is movably extended to the outside of the horizontal frame, a belt 2 is transmission-connected between the motor 2 and the round rod, and one side of the mounting plate 2 is fixedly connected to a protective frame 2 for protecting the belt 2.

[0015] Preferably, the height adjustment assembly includes a long rod rotatably connected to the inner wall of the horizontal frame. Blocks are fixedly connected to both ends of the long rod. One end of the long rod extends outward from the horizontal frame, and a knob is fixedly connected to one end of the long rod.

[0016] Compared with the prior art, the present invention provides a sieving and impurity removing device for grains, having the following beneficial effects:

[0017] 1. Through the provided drying assembly, by using the method of drying after being scattered, the drying effect on grains with large volume after adhesion is improved, which is more conducive to screening the grains after drying. Moreover, the requirement for the length of the drying path is shortened, the volume required for the equipment is reduced. At the same time, the method of guiding the hot air to flow in a circle along the outer ring and then diffuse towards the center improves the uniformity of the temperature in the hot air drying area, can reduce the possibility of poor drying effect due to lower temperature in some areas, and can also reduce the impact force of the grains on the inner wall of the equipment after being scattered, ensure the service life of the equipment, and reduce the degree of breakage of the grains during the drying process.

[0018] 2. Through the provided central dispersion assembly, the hot air can be used to heat the outer ring of the aggregated wet grains, and the elliptical sphere absorbs the heat in the hot air and enters the inside of the aggregated wet grains to heat them, improving the drying effect on a large number of aggregated grains. Moreover, it can also assist the hot air entering the inside of the limiting frame to flow along the outer ring of the limiting frame, improving the guiding effect of the guiding plate on the hot air entering the inside of the limiting frame.

[0019] 3. Through the provided guiding plate and limiting frame, not only most of the hot air entering the inside of the limiting frame is made to flow along its inner wall in a circle and then diffuse towards the center by the guiding plate, preventing uneven heat distribution inside the limiting frame due to the inability of the hot air to reach some areas, but also the shape of the limiting frame reduces the number of guiding plates that need to be installed.

[0020] 4. Through the provided layered feeding assembly, the grains can be intermittently conveyed to different heights inside the drying assembly, and the grains are scattered and dried by the cross bars and elliptical spheres at different heights. The possibility that the grains are blocked by the grains in front after entering the drying assembly and the effect of scattering and drying is reduced. It can also preliminarily disperse the grains that are adhered into blocks after getting wet, reducing the volume of the grain adhesion.

[0021] 5. Through the provided limiting assembly, the grains can enter the drying assembly more quickly, preventing the limiting assembly from being stuck by the grains on the swing plate and unable to rotate. At the same time, it can drive the grains to enter different heights of the drying assembly at different heights, enabling the grains to come into contact and disperse with different heights of the central dispersion assembly in turn, further reducing the possibility that the grains entering the drying assembly later are blocked by the grains in front and resulting in poor dispersion and drying effects.

[0022] 6. Through the provided height adjustment component, the device can not only meet the screening requirements for a small part of wet and sticky grains, but also adapt to the screening needs of the majority of dry grains. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings described herein are used to provide a further understanding of the present application, form a part of the present application, and the schematic embodiments and descriptions thereof are used to explain the present application, and do not constitute an improper limitation to the present application. In the drawings:

[0024] Figure 1 is a schematic structural diagram of the overall grain screening machine of the present invention;

[0025] Figure 2 is a schematic structural diagram of the grain screening frame, layer-by-layer feeding component and drying component of the present invention;

[0026] Figure 3 is a schematic structural diagram of the layer-by-layer feeding component and drying component of the present invention;

[0027] Figure 4 is a schematic structural diagram of the drying component of the present invention;

[0028] Figure 5 is a cross-sectional view of the drying component of the present invention;

[0029] Figure 6 is a schematic structural diagram of the guiding plate and the central dispersion component of the present invention;

[0030] Figure 7 is a schematic structural diagram of the layer-by-layer feeding component of the present invention;

[0031] Figure 8 is a cross-sectional view of the layer-by-layer feeding component of the present invention.

[0032] In the figure: 1, frame; 2, grain screening frame; 3, layer-by-layer feeding component; 31, horizontal frame; 32, elastic swing component; 321, swing plate; 322, baffle; 323, spring; 324, protection plate; 33, arc plate; 34, limit component; 341, round rod; 342, side plate; 343, shovel plate; 35, height adjustment component; 351, long rod; 352, stop block; 353, knob; 4, drying component; 41, limit frame; 411, square frame; 412, semi-circular frame; 42, hot air pipe; 43, guiding plate; 431, short plate; 432, inclined plate; 44, central dispersion component; 441, horizontal plate; 442, rotating rod; 443, cross bar; 444, ellipsoid; 5, mounting plate one; 6, motor one; 7, belt one; 8, protection frame one; 9, mounting plate two; 10, motor two; 11, belt two; 12, protection frame two. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0033] The following will elaborate on the implementation manners of the present application in conjunction with the attached drawings and embodiments, so as to fully understand how the present application uses technical means to solve technical problems and achieve the implementation process of technical effects and implement accordingly.

[0034] Embodiment 1

[0035] In order to improve the screening effect of grains with a large volume after being adhered due to moisture, the adhered grains are dispersed and dried. Figures 1 - 5 For an embodiment of the present invention, a sieving and impurity-removing device for grains is proposed, which includes a frame 1. Inside the frame 1, a grain screening frame 2 is installed. On one side of the frame 1, a vibration motor for driving the grain screening frame 2 to vibrate is installed. At the top of the frame 1, a layered feeding assembly 3 for conveying grains to the grain screening frame 2 at different heights is fixedly connected. Between the grain screening frame 2 and the layered feeding assembly 3, a drying assembly 4 for dispersing and air-drying the grains is installed. The drying assembly 4 includes a limiting frame 41 fixedly connected to the frame 1. On one side of the limiting frame 41, a hot air pipe 42 for conveying hot air into its interior is provided. The inner wall of the limiting frame 41 is fixedly connected with a guiding plate 43 for guiding the hot air to flow along its inner wall. At the center of the limiting frame 41, a central dispersing assembly 44 for rotating and hitting to disperse the agglomerated grains and absorbing the hot air into its interior to dry the contacted grains is installed. During use, the grains that need to be screened and are moist are poured onto the layered feeding assembly 3. The grains slide along the layered feeding assembly 3 and fall into the drying assembly 4. After being dispersed and dried inside the drying assembly 4, they fall into the grain screening frame 2, and then are vibrated and screened on the grain screening frame 2. Finally, the screened grains can be taken away. The specific process of the grains being dispersed and dried inside the drying assembly 4 is as follows:

[0036] The fed grains are divided into different heights at the end of the layered feeding assembly 3 and enter the limiting frame 41, for the initial dispersion of the grains that are moist and adhered together. Then, the central dispersing assembly 44 rotates and collides with the grains entering the interior of the limiting frame 41 to break up the adhered grains. The hot air pipe 42 is connected to an external gas pipe to convey hot air at 50°C - 80°C into the limiting frame 41. After the hot air enters the interior of the limiting frame 41, it flows along the inner wall of the limiting frame 41. Part of the hot air diffuses towards the center of the limiting frame 41 and is then blocked by the guiding plate 43 and is continuously guided along the surface of the guiding plate 43 towards the inner wall of the limiting frame 41, slowing down the diffusion speed of the hot air entering the interior of the limiting frame 41 towards the center of the limiting frame 41, increasing the amount of hot air flowing in a circle along the inner wall of the limiting frame 41, making the hot air diffuse in a circle of the limiting frame 41 and then diffuse significantly towards the center, improving the uniformity of the temperature in different regions inside the limiting frame 41. After the adhered grains are broken up by the central dispersing assembly 44 and their volume becomes smaller, they are dried by the hot air entering the interior of the limiting frame 41.

[0037] At the same time, after being hit by the central dispersing component 44, the grain will move toward the inner wall of the limit frame 41, and the hot air guided by the guide plate 43 and flowing along the inner wall of the limit frame 41 will push the grain moved to the inner wall of the limit frame 41 to move along its tangential direction, thereby changing the direction of the grain that originally hit the limit frame 41, and reducing the force of the grain hitting the limit frame 41 after being scattered. By using the method of drying after being scattered, the drying effect of the grain with a larger volume after adhesion is improved, which is more conducive to screening the grain after drying, and also shortens the requirement for the length of the drying path, reducing the required volume of the equipment. At the same time, the method of guiding the hot air to flow along the outer circle for a circle and then diffusing to the center improves the uniformity of the temperature in the hot air drying area, which can reduce the possibility of poor drying effect due to low temperature in some areas, and can also reduce the force of the grain hitting the inner wall of the equipment after being scattered, thereby ensuring the service life of the equipment and reducing the degree of damage during the grain drying process.

[0038] In order to improve the effect of breaking up and drying the grain that sticks together after being wet, refer to Figure 4 and Figure 5 The central dispersing component 44 includes a transverse plate 441 fixedly connected to the limit frame 41, a rotating rod 442 that movably penetrates the transverse plate 441 is provided at the bottom of the transverse plate 441, a plurality of transverse rods 443 are fixedly connected to the outer side of the rotating rod 442, an elliptical ball 444 is fixedly connected to the transverse rod 443, the interior of the rotating rod 442, the transverse rod 443 and the elliptical ball 444 are all hollow, an exhaust port is opened at the top of the rotating rod 442, and the side of the elliptical ball 444 away from the rotating rod 442 is open, a mounting plate 5 is fixedly connected to one side of the frame 1, a motor 6 is fixedly connected to the bottom of the mounting plate 5, a belt 7 is transmission-connected between the motor 6 and the rotating rod 442, and a protective frame 8 for protecting the belt 7 is installed on the top of the frame 1. When in use, the motor 6 drives the rotating rod 442 to rotate, thereby driving the transverse rod 443 and the elliptical ball 444 to rotate, and the elliptical ball 444 will enter the limit frame 41 The grain that is wet and adhered to one piece is impacted and dispersed.

[0039] During the impact, the ellipsoid 444 comes into contact with the grains. Since the interior of the ellipsoid 444 is hollow and has an opening on one side, the hot air inside the limit frame 41 enters the interior of the ellipsoid 444 during the rotation of the ellipsoid 444. Then, it enters the rotating rod 442 along the cross bar 443 and finally exits from the exhaust port at the top of the rotating rod 442. When the hot air flows inside the ellipsoid 444, it heats the ellipsoid 444. After the ellipsoid 444 comes into contact with the grains that have adhered together after getting wet, heat conduction is used to heat and dry the grains. At the same time, when the ellipsoid 444 rotates, it will push the air inside the limit frame 41 to flow outward, squeezing the hot air entering the limit frame 41 to flow further along the inner wall of the limit frame 41 in a circle. It can use the hot air to heat the outer circle of the aggregated wet grains, and use the ellipsoid 444 to absorb the heat in the hot air and enter the interior of the aggregated wet grains to heat them, improving the drying effect on a large number of aggregated grains. Moreover, it can also assist the hot air entering the limit frame 41 to flow along the outer circle of the limit frame 41, improving the guiding effect of the guiding plate 43 on the hot air entering the limit frame 41.

[0040] In order to limit the grains entering the drying assembly 4 and guide the grains into the grain screening frame 2 for vibrating screening, refer to Figure 4 and Figure 5 The limit frame 41 includes a square frame 411 close to one side of the layered feeding assembly 3. A semi-circular frame 412 is fixedly connected to the side of the square frame 411 away from the layered feeding assembly 3. The top of the semi-circular frame 412 extends to the same height as the highest point of the layered feeding assembly 3. During use, the square frame 411 can cover the entire width of the discharging end of the layered feeding assembly 3, enabling all the grains falling from the layered feeding assembly 3 to enter the limit frame 41 to be dispersed and dried. The relatively high semi-circular frame 412 can not only effectively prevent the grains after being impacted by the central dispersion assembly 44 from moving outside the limit frame 41, but also conveniently guide the hot air to flow along its inner wall, promoting the hot air to flow in a circle along the limit frame 41 and then diffuse towards the center, preventing the hot air from being unable to flow to some areas and making the heat distribution inside the limit frame 41 more uniform.

[0041] Embodiment 2

[0042] Refer to Figures 1 - 6, on the basis of the first embodiment, the guiding plate 43 includes a short plate 431 installed on the inner wall of the semi-circular frame 412 and facing its axis. On the side of the short plate 431 away from the semi-circular frame 412, an inclined plate 432 is fixedly connected. A ventilation slot is opened at the bottom of the short plate 431. After the hot air is guided by the hot air pipe 42 into the limiting frame 41, it flows towards the semi-circular frame 412. After flowing around the semi-circular frame 412 for one circle, it returns to the square frame 411 again. At this time, after flowing around the limiting frame 41 for one circle, the hot air can diffuse towards the center of the limiting frame 41. Therefore, there is no need to guide the hot air to flow along the inner wall of the square frame 411 anymore. Moreover, since the width of the square frame 411 is larger than the width of the semi-circular frame 412, when the grains are impacted and move to be close to the inner wall of the square frame 411, the time they pass through is longer, the degree of speed reduction is greater, and the impact force on the inner wall of the square frame 411 is also weakened. Therefore, the need to block the impact of grains on its inner wall in the square frame 411 is also smaller. Therefore, the guiding plate 43 is only installed in the semi-circular frame 412.

[0043] When the hot air is sent into the limiting frame 41 by the hot air pipe 42, it flows towards the semi-circular frame 412. A small part of it continues to flow forward along the inner wall of the semi-circular frame 412, and most of the other part diffuses towards the center of the semi-circular frame 412. A part of this part of the diffused and continuously flowing forward hot air is blocked by the inclined plate 432, and then flows along the inclined plate 432 towards the inner wall of the semi-circular frame 412. Finally, it passes through the ventilation slot on the short plate 431, so that most of the hot air is guided to flow along the inner wall of the semi-circular frame 412, and a small part diffuses towards the center of the semi-circular frame 412. The hot air continues to flow to the next guiding plate 43, and the process of flowing is the same as above, until the hot air flows around the semi-circular frame 412 for one circle and enters the square frame 411. Not only does the guiding plate 43 make most of the hot air entering the limiting frame 41 flow along its inner wall for one circle and then diffuse towards the center, preventing uneven heat distribution inside the limiting frame 41 due to the inability of hot air to reach some areas, but also the shape of the limiting frame 41 is used to reduce the number of guiding plates 43 to be installed.

[0044] Embodiment Three

[0045] Although the grains that are adhered into lumps after getting wet can be dispersed and dried after entering the drying assembly 4, the effect of dispersing the grains when they enter the same position inside the drying assembly 4 is poor. The grains entering the drying assembly 4 subsequently will be blocked by the grains that are about to collide or are colliding with the central dispersing assembly 44 in the front. In order to improve the dispersing effect of the grains that are adhered into lumps after getting wet, referring to Figures 1 - 8, on the basis of the first embodiment, the layered feeding component 3 includes a horizontal frame 31 fixedly connected to the rack 1. The inner bottom of the horizontal frame 31 is an inclined surface. A notch is formed on one side of the horizontal frame 31 close to the drying component 4. An elastic swing component 32 is installed inside the notch. Arc-shaped plates 33 for guiding the grains to move towards the notch are fixedly connected to both sides of the inner wall of the horizontal frame 31. A limiting component 34 for pushing the elastic swing component 32 at different angles is installed at one end of the horizontal frame 31 close to the drying component 4. A height adjustment component 35 is installed inside the horizontal frame 31 close to the arc-shaped plate 33. When in use, the grains to be screened entering the inside of the horizontal frame 31 will squeeze the elastic swing component 32 to a certain height when passing through it. This height is defined as height one. When the limiting component 34 passes through the elastic swing component 32, it will push the elastic swing component 32 down for a certain distance. The height after the elastic swing component 32 is pushed down by the limiting component 34 is defined as height two. The grains in the horizontal frame 31 fall onto different heights inside the limiting frame 41 along the elastic swing component 32 at height one and height two respectively, and come into contact and collision with the cross bars 443 and elliptical balls 444 at different heights, so that the grains can be intermittently conveyed to different heights inside the drying component 4. The cross bars 443 and elliptical balls 444 at different heights are used to disperse and dry the grains, reducing the possibility that the grains are blocked by the grains in front after entering the drying component 4, resulting in a reduction in the effect of dispersion and drying. It can also initially disperse the grains that are adhered into blocks after getting wet, reducing the volume of the adhered grains.

[0046] In order to enable the elastic swing component 32 to maintain at different heights, refer to Figure 8 , the elastic swing component 32 includes a swing plate 321 rotatably connected to the horizontal frame 31. A baffle plate 322 is fixedly connected to the bottom of the horizontal frame 31. A spring 323 is fixedly connected between the baffle plate 322 and the swing plate 321. A protective plate 324 for covering the gap between the swing plate 321 and the horizontal frame 31 is fixedly connected to one side of the inner wall of the notch. When in use, the spring 323 pushes the swing plate 321 to rotate to the highest position. When the grains inside the horizontal frame 31 slide to the swing plate 321, the weight of the grains presses the swing plate 321 downward, causing the swing plate 321 to descend by a certain height and squeezing the spring 323 to contract. At this time, the height of the swing plate 321 is height one. When the limiting component 34 rotates and contacts the swing plate 321, the limiting component 34 pushes the swing plate 321 to continue descending by a certain height and further squeezes the spring 323 to contract. At this time, the height of the swing plate 321 is height two. Until the limiting component 34 disengages from the contact with the swing plate 321, the spring 323 pushes the swing plate 321 back to height one, enabling the swing plate 321 to maintain at different heights, facilitating the grains to enter the drying component 4 from different heights by controlling the height of the swing plate 321.

[0047] In order to enable the grains to enter the drying component 4 at multiple different heights, refer to Figure 7 andFigure 8 , the limiting component 34 includes a round rod 341 rotatably connected to the inner wall of the horizontal frame 31. A plurality of side plates 342 with different widths are fixedly connected to the outer side of the round rod 341. A shovel plate 343 is fixedly connected to the side of the side plate 342 away from the round rod 341. The shovel plate 343 is an arc-shaped plate. One side of the frame 1 is fixedly connected with a second mounting plate 9. One side of the second mounting plate 9 is fixedly connected with a second motor 10. One end of the round rod 341 extends outward from the horizontal frame 31. A second belt 11 is connected between the second motor 10 and the round rod 341. A second protective frame 12 for protecting the second belt 11 is fixedly connected to one side of the second mounting plate 9. During use, the second motor 10 drives the round rod 341 to rotate, thereby driving the side plates 342 and the shovel plate 343 to rotate. Since the side plate 342 is closest to the swing plate during rotation, and the shovel plate 343 is perpendicular to the swing plate 321 when cutting into the swing plate 321 in an inclined direction during rotation, and the shovel plate 343 is not perpendicular to the swing plate 321 due to its certain curvature, it can be inserted into the grain inside the swing plate 321 at a certain angle.

[0048] During the rotation process, it pushes the grain to move along the swing plate 321 and accelerate into the drying component 4, and will not be stuck by the grain on the swing plate 321 and unable to rotate. Since the widths of different side plates 342 are different, the distances they push the swing plate 321 downward when contacting the swing plate 321 are also different, so that the swing plate 321 can be controlled to guide the grain into more heights inside the drying component 4 at more heights, which can accelerate the grain into the drying component 4, prevent the limiting component 34 from being stuck by the grain on the swing plate 321 and unable to rotate, and at the same time can drive the grain to enter different heights of the drying component 4 at different heights, so that the grain contacts and disperses with different heights of the central dispersion component 44 in turn, further reducing the possibility that the grain entering the drying component 4 subsequently is blocked by the grain in front and resulting in poor dispersion and drying effects.

[0049] Embodiment 4

[0050] In order to enable the grain screening machine to not only adapt to the situation of screening a small part of wet and sticky grains, but also adapt to the situation of screening a large part of dry grains, refer to Figures 1 - 8, on the basis of the first embodiment, the height adjustment assembly 35 includes a long rod 351 rotatably connected to the inner wall of the horizontal frame 31. Both ends of the long rod 351 are fixedly connected with stoppers 352. One end of the long rod 351 extends out of the horizontal frame 31 movably, and one end of the long rod 351 is fixedly connected with a knob 353. When screening dry grains, there is no need to disperse and dry the grains. At this time, the staff rotates the knob 353 to drive the long rod 351 to rotate, and then drive the stopper 352 to rotate until the stopper 352 pushes the swing plate 321 down to the lowest position. At this time, the side plate 342 and the shovel plate 343 cannot contact the swing plate 321 after rotation, and the work of the limit assembly 34 and the drying assembly 4 is stopped. After the grains to be screened for drying are poured into the horizontal frame 31, they fall onto the limit frame 41 through the swing plate 321, and then directly pass through the limit frame 41 and fall into the grain screening frame 2 to be vibrated and screened, so that the equipment can not only meet the screening requirements for a small part of wet and sticky grains, but also meet the screening requirements for most dry grains.

[0051] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A grain screening and impurity removal device, comprising a frame (1), a grain screening frame (2) installed inside the frame (1), and a vibration motor for driving the grain screening frame (2) to vibrate installed on one side of the frame (1), characterized in that: A layered feeding assembly (3) for conveying grains at different heights to the grain screening frame (2) is fixedly connected to the top of the frame (1); a drying assembly (4) for dispersing and air-drying the grains is installed between the grain screening frame (2) and the layered feeding assembly (3); The drying component (4) comprises a limit frame (41) fixedly connected to the frame (1); a hot air duct (42) for conveying hot air into the interior of the limit frame (41) is provided on one side of the limit frame (41); a guide plate (43) for guiding the hot air to flow along the inner wall of the limit frame (41) is fixedly connected to the inner wall of the limit frame (41); and a central dispersion component (44) for rotating and knocking apart agglomerated grains and absorbing hot air into the interior to dry the grains in contact therewith is installed at the center of the limit frame (41).

2. The grain screening and impurity removal device according to claim 1, characterized in that: The central dispersion component (44) comprises a horizontal plate (441) fixedly connected to the limiting frame (41); a rotating rod (442) movably penetrating the horizontal plate (441) is provided at the bottom of the horizontal plate (441); a plurality of horizontal rods (443) are fixedly connected to the outer side of the rotating rod (442); an elliptical ball (444) is fixedly connected to the horizontal rod (443); the interiors of the rotating rod (442), the horizontal rod (443) and the elliptical ball (444) are all hollow; an exhaust port is provided at the top of the rotating rod (442), and the side of the elliptical ball (444) away from the rotating rod (442) is open.

3. The grain screening and impurity removal device according to claim 1, characterized in that: A mounting plate (5) is fixedly connected to one side of the frame (1); a motor (6) is fixedly connected to the bottom of the mounting plate (5); a belt (7) is transmission-connected between the motor (6) and the rotating rod (442); and a protective frame (8) for protecting the belt (7) is installed on the top of the frame (1).

4. The grain screening and impurity removal device according to claim 1, characterized in that: The limiting frame (41) comprises a square frame (411) on one side close to the layered loading assembly (3), and a semicircular frame (412) is fixedly connected to the side of the square frame (411) away from the layered loading assembly (3), and the top of the semicircular frame (412) extends to the same height as the highest point of the layered loading assembly (3).

5. The grain screening and impurity removal device according to claim 4, characterized in that: The guide plate (43) comprises a short plate (431) installed on the inner wall of the semicircular frame (412) and facing the axis thereof, a side of the short plate (431) away from the semicircular frame (412) is fixedly connected to an inclined plate (432), and a ventilation slot is provided at the bottom of the short plate (431).

6. The grain screening and impurity removal device according to claim 1, characterized in that: The layered feeding assembly (3) comprises a transverse frame (31) fixedly connected to the frame (1); the inner bottom of the transverse frame (31) is an inclined surface; a notch is provided on a side of the transverse frame (31) close to the drying assembly (4); an elastic swing assembly (32) is installed inside the notch; arc plates (33) for guiding grain to move toward the notch are fixedly connected to both sides of the inner wall of the transverse frame (31); a limit assembly (34) for pushing the elastic swing assembly (32) toward different angles is installed at one end of the transverse frame (31) close to the drying assembly (4); and a height adjustment assembly (35) is installed inside the transverse frame (31) close to the arc plate (33).

7. The grain screening and impurity removal device according to claim 6, characterized in that: The elastic swing assembly (32) comprises a swing plate (321) rotatably connected to the transverse frame (31); a baffle (322) is fixedly connected to the bottom of the transverse frame (31); a spring (323) is fixedly connected between the baffle (322) and the swing plate (321); and a protective plate (324) for covering a gap between the swing plate (321) and the transverse frame (31) is fixedly connected to one side of the inner wall of the notch.

8. The grain screening and impurity removal device according to claim 6, characterized in that: The limiting assembly (34) comprises a round rod (341) rotatably connected to the inner wall of the transverse frame (31); a plurality of side plates (342) of different widths are fixedly connected to the outer side of the round rod (341); and a shovel plate (343) is fixedly connected to the side of the side plate (342) away from the round rod (341).

9. The grain screening and impurity removal device according to claim 8, characterized in that: A second mounting plate (9) is fixedly connected to one side of the frame (1), a second motor (10) is fixedly connected to one side of the second mounting plate (9), one end of the round rod (341) is movably extended to the outside of the horizontal frame (31), a second belt (11) is transmission-connected between the second motor (10) and the round rod (341), and a second protection frame (12) for protecting the second belt (11) is fixedly connected to one side of the second mounting plate (9).

10. The grain screening and impurity removal device according to claim 6, characterized in that: The height adjustment assembly (35) comprises a long rod (351) rotatably connected to the inner wall of the horizontal frame (31), both ends of the long rod (351) are fixedly connected to stoppers (352), one end of the long rod (351) movably extends to the outside of the horizontal frame (31), and one end of the long rod (351) is fixedly connected to a knob (353).

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