Multi-stage shaking screening device and method for cereal raw materials

Abstract

The invention discloses a multi-stage shaking screening device and method for cereal raw materials, and relates to the technical field of cereal screening equipment. The conveying box is fixed to the outer wall of one side of the screening box, a spiral conveying rod is arranged in the conveying box, the upper end of the spiral conveying rod is rotationally connected to the top wall of the conveying box through a bearing, and the lower end of the spiral conveying rod penetrates through the lower side of the conveying box and then is exposed to the lower side of the conveying box; an output shaft of the conveying motor is fixedly connected with the top end of the spiral conveying rod; a dust removal net is fixedly arranged on the lower side in the dust removal box; the feeding hopper is located on the side, away from the screening box, of the conveying box, and the lower side of the feeding hopper is inserted and fixed to the top wall of the dust removal box; the plurality of filter plates are connected with one another through a shaking mechanism; the discharging mechanism is arranged on one side of the annular wall of the screening box and matched with the multiple filtering plates. Dust and impurities in cereal raw materials can be screened firstly, then different particle sizes of the cereal raw materials are collected in a shaking mode, the steps are simple, and the cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of cereal screening equipment, and in particular to a multi-stage shaking screening device and method for cereal raw materials. Background Art

[0002] Cereals are a type of food crop. Cereals also contain vitamin E and B vitamins. Cereal raw materials need to be screened before production. Existing screening devices can separate light impurities from cereals, but cannot separate qualified cereals into large and small particle sizes after screening. If cereals with different particle sizes need to be distinguished and collected, the cereals still need to be screened again with the help of grading equipment. In this way, impurity removal and grading require two processes, which are cumbersome and increase costs. Summary of the invention

[0003] The purpose of the present invention is to address the defects and shortcomings of the prior art and to provide a multi-stage shaking screening device and method for cereal raw materials that is reasonably designed and easy to use. The device and method can first screen the dust and impurities in the cereal raw materials, and then distinguish and collect particle sizes of different sizes by shaking. The steps are simple and the cost is reduced.

[0004] To achieve the above object, the present invention adopts the following technical scheme: it comprises a screening box, supporting legs, a feed pipe and a discharge pipe, a plurality of supporting legs are fixed at equal angles on the outer bottom wall of the screening box, a feed pipe is inserted and fixed through one side of the top of the screening box, and a discharge pipe is passed through the bottom wall of the screening box; it also comprises:

[0005] A conveying box, wherein the conveying box is fixed on the outer wall of one side of the screening box, and the upper part of one side of the outer ring wall of the conveying box is intersected with the feed pipe. A spiral conveying rod is arranged inside the conveying box, and the upper end of the spiral conveying rod is screwed on the top wall of the conveying box through a bearing, and the lower end of the spiral conveying rod passes through the lower side of the conveying box and is exposed on the lower side of the conveying box;

[0006] A conveying motor, wherein the conveying motor is fixed on the outer top wall of the conveying box, the output shaft of the conveying motor is inserted into the top wall of the conveying box, and the output shaft of the conveying motor is fixedly connected to the top end of the spiral conveying rod;

[0007] A dust removal box, wherein the dust removal box is arranged on one side of the bottom wall of the screening box, and the lower end of the conveying box is located in the dust removal box after passing through the top wall of the dust removal box, and a dust removal net is fixedly arranged on the lower side of the interior of the dust removal box, and one side of the upper surface of the dust removal net is arranged to conflict with the lower end of the spiral conveying rod;

[0008] A feed hopper, the feed hopper is located on a side of the conveying box away from the screening box, and the lower side of the feed hopper is inserted and fixed on the top wall of the dust removal box;

[0009] Filter plates, wherein there are several filter plates, and the filter plates are arranged in the screening box from top to bottom, the filter holes on the several filter plates from top to bottom are arranged to be gradually reduced, and the several filter plates are connected to the several filter plates through a shaking mechanism;

[0010] A discharge mechanism, which is arranged on one side of the ring wall of the screening box and is matched with a plurality of filter plates;

[0011] Through the above technical scheme, the cereal raw materials enter the dust removal box through the feed hopper, and the gravel and dust in the cereal raw materials pass through the dust removal net and fall downward to the lower side of the dust removal box. The conveying motor is started, and the conveying motor drives the spiral conveying rod to rotate. During the rotation, the spiral conveying rod conveys the cereal raw materials upward and enters the screening box through the feed pipe. In this process, the shaking mechanism is started, and the filter plate is driven to shake up and down by the shaking mechanism, so as to facilitate the filter plate to grade and screen the cereal raw materials. The cereal raw materials filtered by the filter plate are discharged through the discharging mechanism.

[0012] As a further improvement of the present invention, a collection box is provided on the lower side of the dust removal net, and the front side of the collection box passes through the front side wall of the dust removal box and is arranged in the same plane as the outer wall of the front side of the dust removal box, and a handle is fixed to the outer wall of the front side of the collection box;

[0013] Through the above technical solution, the gravel and dust filtered by the dust removal net are collected through the collection box, so as to facilitate cleaning.

[0014] As a further improvement of the present invention, the shaking mechanism comprises:

[0015] A connecting pipe, wherein the connecting pipe is arranged in the screening box, the connecting pipe passes through and is screwed to a plurality of filter plates through bearings, a driving rod is inserted into the interior of the connecting pipe, the upper end of the driving rod is screwed through the top wall of the screening box through the bearing, and a driving motor is fixed thereto, and the driving motor is fixed to the outer top wall of the screening box;

[0016] A driving strip, wherein the driving strip is in multiple numbers and fixed at equal angles on the outer ring wall of the driving rod, and the driving strip is movably embedded in a strip groove on the inner ring wall of the connecting tube;

[0017] A fixing rod, wherein the fixing rod is movably inserted in the lower end of the connecting pipe, a connecting rod is fixed symmetrically to the lower side of the outer ring wall of the fixing rod, and the other end of the connecting rod is fixed to the inner ring wall of the screening box;

[0018] A toggle rod, the toggle rod is fixed to the upper end of one side of the outer ring wall of the fixed rod, and the toggle rod is inserted into the guide groove on the inner ring wall of the connecting pipe;

[0019] A return spring, wherein the return spring is arranged in the connecting tube, the upper end of the return spring is fixedly connected to the inner wall of the connecting tube, and the lower end of the return spring is fixed with a rotating disk, which is screwed to the top end of the fixed rod through the shaft rod;

[0020] Through the above technical solution, the driving motor is started, the driving motor drives the driving rod to rotate, and the driving rod drives the connecting tube to rotate through the driving bar. During the rotation of the connecting tube, the guide groove on the inner wall of the connecting tube rotates along the toggle rod, so that the connecting tube drives the filter plate to move up and down, achieving a shaking effect.

[0021] As a further improvement of the present invention, a square rod is provided inside the reset spring, the lower end of the square rod is fixed on the upper surface of the rotating disk, and the upper end of the square rod is movably inserted in the connecting tube;

[0022] The above technical solution can facilitate the support of the return spring, thus preventing the rotational force from affecting the return spring.

[0023] As a further improvement of the present invention, a plurality of limit bars are fixed at equal angles on the inner ring wall of the screening box, and the limit bars are movably inserted into the limit grooves on the outer ring walls of the plurality of filter plates;

[0024] The above technical solution can facilitate the positioning of the filter plate, thereby preventing the filter plate from rotating with the connecting pipe during its rotation.

[0025] As a further improvement of the present invention, a plurality of stirring rods are arranged at equal angles on the upper side of the filter plate, and the stirring rods are fixed on the outer ring wall of the connecting tube; this can facilitate stirring of the cereal raw materials, avoid accumulation of the cereal raw materials, and improve the screening effect.

[0026] As a further improvement of the present invention, the discharging mechanism comprises:

[0027] Discharge pipes, there are several discharge pipes, and they are all arranged in an inverted "L" shape, the horizontal pipes of the discharge pipes are inserted into one side of the outer ring wall of the screening box from top to bottom, and the vertical pipes of the discharge pipes are arranged from outside to inside;

[0028] A blocking plate, wherein there are several blocking plates, and they are arranged one by one on the inner side of the horizontal pipe of the discharge pipe, and two adjacent blocking plates are connected by a linkage rod;

[0029] An adjusting screw, wherein the adjusting screw is screwed into the uppermost sealing plate through a thread, and the upper end of the adjusting screw passes through the upper side wall of the sealing plate and is screwed into the annular wall of the screening box through a bearing, and an adjusting motor is fixed to the top end of the adjusting screw, and the adjusting motor is embedded and fixed in the annular wall of the screening box;

[0030] Through the above technical solution, the adjusting motor is started, the adjusting motor drives the adjusting screw to rotate, and the adjusting screw drives the uppermost sealing plate to move upward, and the sealing plate drives several sealing plates on the lower side to move upward through the linkage rod, so that the sealing plate moves upward from one side of the discharge pipe and separates from the discharge pipe, thereby facilitating discharge.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] 1. The dust and impurities in the grain raw materials can be screened through the dust removal net, and then the grain raw materials are transported through the spiral conveyor rod to enter the screening box, thereby eliminating the need for manual transportation and reducing the transportation cost;

[0033] 2. The filter plate is connected to the screening box through a shaking mechanism, which drives the filter plate to shake up and down. The filter holes on the filter plate are of different sizes, so different particle sizes can be screened;

[0034] 3. A discharging mechanism is arranged on one side of the outer ring wall of the screening box. During the screening process, the discharging pipe can be blocked to prevent the cereal raw materials from being discharged through the discharging pipe without being screened, so as to facilitate classification and collection. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a structural schematic diagram of the present invention.

[0036] Figure 2 It is a schematic diagram of the internal structure of the present invention.

[0037] Figure 3 It is an exploded view of the filter plate and shaking mechanism in the present invention.

[0038] Figure 4 It is a cross-sectional view of the connecting pipe in the present invention.

[0039] Figure 5 for Figure 4 Enlarged view of part A in the middle.

[0040] Figure 6 It is an exploded view of the discharging mechanism in the present invention.

[0041] Description of reference numerals:

[0042] Screening box 1, supporting feet 2, feed pipe 3, discharge pipe 4, conveying box 5, spiral conveying rod 6, conveying motor 7, dust removal box 8, dust removal net 9, feed hopper 10, filter plate 11, shaking mechanism 12, connecting pipe 12-1, guide groove 12-1-1, drive rod 12-2, drive motor 12-3, drive bar 12-4, fixing rod 12-5, connecting rod 12-6, toggle rod 12-7, return spring 12-8, rotating disk 12-9, discharge mechanism 13, discharge pipe 13-1, blocking plate 13-2, linkage rod 13-3, adjusting screw 13-4, adjusting motor 13-5, collecting box 14, handle 15, square rod 16, limit bar 17, stirring rod 18. DETAILED DESCRIPTION

[0043] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. The preferred embodiments in the description are only used as examples, and all other embodiments obtained by those skilled in the art without making any creative work are within the scope of protection of the present invention.

[0044] Embodiment 1:

[0045] like Figure 1-Figure 6 As shown, this embodiment comprises a screening box 1, supporting legs 2, a feed pipe 3 and a discharge pipe 4. Several supporting legs 2 are welded and fixed at equal angles on the outer bottom wall of the screening box 1. A feed pipe 3 is inserted and welded and fixed on the left side of the top of the screening box 1. A discharge pipe 4 is penetrated on the bottom wall of the screening box 1. It also comprises:

[0046] The conveying box 5 is welded and fixed on the outer wall of the left side of the screening box 1. The upper part of the right side of the outer ring wall of the conveying box 5 is connected with the feeding pipe 3. A spiral conveying rod 6 is arranged inside the conveying box 5. The upper end of the spiral conveying rod 6 is screwed to the top wall of the conveying box 5 through a bearing. The lower end of the spiral conveying rod 6 passes through the lower side of the conveying box 5 and is exposed on the lower side of the conveying box 5.

[0047] The conveying motor 7 is fixed to the outer top wall of the conveying box 5 by bolts, the output shaft of the conveying motor 7 is inserted into the top wall of the conveying box 5, and the output shaft of the conveying motor 7 is fixedly connected to the top end of the spiral conveying rod 6;

[0048] A dust removal box 8 is provided on the left side of the bottom wall of the screening box 1. The lower end of the conveying box 5 passes through the top wall of the dust removal box 8 and is located in the dust removal box 8. A dust removal net 9 is fixedly provided on the lower side of the interior of the dust removal box 8. The right side of the upper surface of the dust removal net 9 is arranged to be in conflict with the lower end of the spiral conveying rod 6. A collecting box 14 is provided on the lower side of the dust removal net 9. The front side of the collecting box 14 passes through the front side wall of the dust removal box 8 and is arranged in the same plane as the outer wall of the front side of the dust removal box 8. A handle 15 is welded and fixed to the outer wall of the front side of the collecting box 14. The crushed stones and dust filtered by the dust removal net 9 are collected through the collecting box 14, so as to facilitate cleaning.

[0049] A feed hopper 10, wherein the feed hopper 10 is located on a side of the conveying box 5 away from the screening box 1, and the lower side of the feed hopper 10 is inserted and welded to the top wall of the dust removal box 8;

[0050] The filter plates 11 are multiple and are arranged in the screening box 1 from top to bottom. The filter holes on the multiple filter plates 11 are gradually reduced from top to bottom. The multiple filter plates 11 are connected to each other through a shaking mechanism 12.

[0051] The discharging mechanism 13 is arranged on the right side of the ring wall of the screening box 1 , and the discharging mechanism 13 is arranged in coordination with a plurality of filter plates 11 .

[0052] Embodiment 2:

[0053] See also Figure 1-5 As shown, based on Example 1, the shaking mechanism 12 includes:

[0054] A connecting pipe 12-1 is provided in the screening box 1. The connecting pipe 12-1 passes through and is screwed with several filter plates 11 through bearings. A driving rod 12-2 is inserted inside the connecting pipe 12-1. After the upper end of the driving rod 12-2 passes through the top wall of the screening box 1 through the bearing screw connection, a driving motor 12-3 is fixed. The driving motor 12-3 is fixed to the outer top wall of the screening box 1 through bolts. Several limiting strips 17 are fixed by equal-angle welding on the inner ring wall of the screening box 1. The limiting strips 17 are movably inserted in the limiting grooves on the outer ring walls of several filter plates 11, which can facilitate the limiting of the filter plates 11 and prevent the filter plates 11 from rotating with the connecting pipe 12-1.

[0055] Several stirring rods 18 are arranged at equal angles on the upper side of the filter plate 11, and the stirring rods 18 are welded and fixed on the outer ring wall of the connecting pipe 12-1; this facilitates stirring of the cereal raw materials, avoids accumulation of the cereal raw materials, and improves the screening effect;

[0056] The driving strips 12-4 are several in number and are welded and fixed at equal angles on the outer ring wall of the driving rod 12-2. The driving strips 12-4 are movably embedded in the strip groove on the inner ring wall of the connecting tube 12-1.

[0057] A fixing rod 12-5, wherein the fixing rod 12-5 is movably inserted in the lower end of the connecting tube 12-1, and a connecting rod 12-6 is symmetrically welded and fixed to the lower side of the outer ring wall of the fixing rod 12-5, and the other end of the connecting rod 12-6 is welded and fixed to the inner ring wall of the screening box 1;

[0058] A toggle rod 12-7, wherein the toggle rod 12-7 is welded and fixed to the upper end of the right side of the outer ring wall of the fixing rod 12-5, and the toggle rod 12-7 is inserted into the guide groove 12-1-1 on the inner ring wall of the connecting tube 12-1;

[0059] A return spring 12-8 is provided inside the connecting tube 12-1, the upper end of the return spring 12-8 is welded and fixed to the inner wall of the connecting tube 12-1, and a rotating disk 12-9 is welded and fixed to the lower end of the return spring 12-8, and the rotating disk 12-9 is screwed to the top end of the fixed rod 12-5 through an axle rod; a square rod 16 is provided inside the return spring 12-8, the lower end of the square rod 16 is welded and fixed to the upper surface of the rotating disk 12-9, and the upper end of the square rod 16 is movably inserted in the connecting tube 12-1, which can facilitate the support of the return spring 12-8 and avoid the influence of the rotational force on the return spring 12-8.

[0060] Embodiment 3:

[0061] See also Figure 1-2 , Figure 6 As shown, based on Example 1, the discharging mechanism 13 comprises:

[0062] Discharge pipe 13-1, there are several discharge pipes 13-1, and they are all arranged in an inverted "L" shape, the horizontal pipes of the discharge pipe 13-1 are inserted in the right side of the outer ring wall of the screening box 1 from top to bottom, and the vertical pipes of the discharge pipe 13-1 are arranged in sequence from outside to inside;

[0063] A blocking plate 13-2, wherein there are several blocking plates 13-2, and they are arranged one by one on the inner side of the horizontal tube of the discharge pipe 13-1, and two adjacent blocking plates 13-2 are connected by a linkage rod 13-3;

[0064] The adjusting screw 13-4 is screwed into the uppermost sealing plate 13-2 through a thread. After the upper end of the adjusting screw 13-4 passes through the upper side wall of the sealing plate 13-2, it is screwed into the annular wall of the screening box 1 through a bearing. An adjusting motor 13-5 is fixed to the top of the adjusting screw 13-4. The adjusting motor 13-5 is embedded in the annular wall of the screening box 1 and fixed by bolts.

[0065] When the present invention is used, the cereal raw materials enter the dust removal box 8 through the feed hopper 10, and the crushed stones and dust in the cereal raw materials pass through the dust removal net 9 and fall downward to the lower side of the dust removal box 8. The conveying motor 7 is started, and the conveying motor 7 drives the spiral conveying rod 6 to rotate. During the rotation process, the spiral conveying rod 6 conveys the cereal raw materials upward and enters the screening box 1 through the feed pipe 3. During this process, the driving motor 12-3 is started, and the driving motor 12-3 drives the driving rod 12-2 to rotate. The driving rod 12-2 drives the connecting tube 12-1 to rotate through the driving bar 12-4. During the rotation process of the connecting tube 12-1, the guide on the inner wall thereof The groove 12-1-1 rotates along the toggle rod 12-7, so that the connecting pipe 12-1 drives the filter plate 11 to move up and down, achieving a shaking effect, so that the filter plate 11 can grade and screen the cereal raw materials, and start the adjusting motor 13-5. The adjusting motor 13-5 drives the adjusting screw 13-4 to rotate, and the adjusting screw 13-4 drives the uppermost blocking plate 13-2 to move upward. The blocking plate 13-2 drives several blocking plates 13-2 on the lower side to move upward through the linkage rod 13-3, so that the blocking plate 13-2 moves upward from one side of the discharge pipe 13-1 and separates from the discharge pipe 13-1, thereby facilitating discharge.

[0066] Compared with the prior art, the beneficial effects of this specific implementation are as follows:

[0067] 1. The dust and impurities in the cereal raw materials can be screened through the dust removal net 9, and then the cereal raw materials are transported through the spiral conveying rod 6 to enter the screening box 1, thereby eliminating the need for manual transportation and reducing the transportation cost;

[0068] 2. The filter plate 11 is connected to the screening box 1 through a shaking mechanism 12, and the filter plate 11 is driven to shake up and down by shaking. The filter holes on the filter plate 11 have different sizes, so that particles of different sizes can be screened;

[0069] 3. A discharge mechanism 13 is provided on one side of the outer ring wall of the screening box 1. During the screening process, the discharge pipe 13-1 can be blocked to prevent the cereal raw materials from being discharged through the discharge pipe 13-1 without being screened, so as to facilitate classification and collection.

[0070] For those skilled in the art, they can modify the technical solutions described in the aforementioned embodiments and make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A multi-stage shaking screening device for cereal raw materials, characterized in that: It comprises a screening box (1), supporting legs (2), a feed pipe (3) and a discharge pipe (4); a plurality of supporting legs (2) are fixed at equal angles on the outer bottom wall of the screening box (1); a feed pipe (3) is inserted and fixed through one side of the top of the screening box (1); and a discharge pipe (4) is inserted through the bottom wall of the screening box (1); it also comprises: A conveying box (5), wherein the conveying box (5) is fixed on the outer wall of one side of the screening box (1), and the upper part of one side of the outer ring wall of the conveying box (5) is intersected with the feeding pipe (3). A spiral conveying rod (6) is arranged inside the conveying box (5), and the upper end of the spiral conveying rod (6) is screwed to the top wall of the conveying box (5) through a bearing, and the lower end of the spiral conveying rod (6) passes through the lower side of the conveying box (5) and is exposed on the lower side of the conveying box (5); A conveying motor (7), wherein the conveying motor (7) is fixed on the outer top wall of the conveying box (5), the output shaft of the conveying motor (7) is inserted into the top wall of the conveying box (5), and the output shaft of the conveying motor (7) is fixedly connected to the top end of the spiral conveying rod (6); A dust removal box (8), wherein the dust removal box (8) is arranged on one side of the bottom wall of the screening box (1), and the lower end of the conveying box (5) is located in the dust removal box (8) after passing through the top wall of the dust removal box (8). A dust removal net (9) is fixedly arranged on the lower side of the interior of the dust removal box (8), and one side of the upper surface of the dust removal net (9) is arranged to abut against the lower end of the spiral conveying rod (6); A feed hopper (10), the feed hopper (10) being located on a side of the conveying box (5) away from the screening box (1), and the lower side of the feed hopper (10) being inserted and fixed on the top wall of the dust removal box (8); A filter plate (11), wherein the filter plates (11) are in plurality and are arranged in the screening box (1) from top to bottom, the filter holes on the filter plates (11) are arranged to be gradually reduced from top to bottom, and the filter plates (11) are connected to the filter plates (11) via a shaking mechanism (12); The discharging mechanism (13) is arranged on one side of the ring wall of the screening box (1), and the discharging mechanism (13) is arranged in coordination with a plurality of filter plates (11).

2. The multi-stage shaking screening device for cereal raw materials according to claim 1 is characterized in that: A collecting box (14) is arranged on the lower side of the dust removal net (9). After the front side of the collecting box (14) passes through the front side wall of the dust removal box (8), it is arranged in the same plane as the outer wall of the front side of the dust removal box (8). A handle (15) is fixed to the outer wall of the front side of the collecting box (14).

3. The multi-stage shaking screening device for cereal raw materials according to claim 1, characterized in that: The shaking mechanism (12) comprises: A connecting pipe (12-1), wherein the connecting pipe (12-1) is arranged in the screening box (1), the connecting pipe (12-1) passes through and is screwed to the plurality of filter plates (11) via bearings, a driving rod (12-2) is inserted into the interior of the connecting pipe (12-1), the upper end of the driving rod (12-2) is screwed through the top wall of the screening box (1) via a bearing, and a driving motor (12-3) is fixed thereto, and the driving motor (12-3) is fixed to the outer top wall of the screening box (1); A driving strip (12-4), wherein the driving strips (12-4) are multiple and fixed at equal angles on the outer ring wall of the driving rod (12-2), and the driving strips (12-4) are movably embedded in a strip groove on the inner ring wall of the connecting tube (12-1); A fixing rod (12-5), wherein the fixing rod (12-5) is movably inserted into the lower end of the connecting tube (12-1), a connecting rod (12-6) is fixed symmetrically to the lower side of the outer ring wall of the fixing rod (12-5), and the other end of the connecting rod (12-6) is fixed to the inner ring wall of the screening box (1); A toggle rod (12-7), wherein the toggle rod (12-7) is fixed to the upper end of one side of the outer ring wall of the fixing rod (12-5), and the toggle rod (12-7) is inserted into a guide groove (12-1-1) on the inner ring wall of the connecting tube (12-1); A return spring (12-8), wherein the return spring (12-8) is arranged in the connecting tube (12-1), the upper end of the return spring (12-8) is fixedly connected to the inner wall of the connecting tube (12-1), and the lower end of the return spring (12-8) is fixed with a rotating disk (12-9), and the rotating disk (12-9) is screwed to the top end of the fixed rod (12-5) through a shaft rod.

4. The multi-stage shaking screening device for cereal raw materials according to claim 3 is characterized in that: A square rod (16) is arranged inside the return spring (12-8), the lower end of the square rod (16) is fixed on the upper surface of the rotating disk (12-9), and the upper end of the square rod (16) is movably inserted into the connecting tube (12-1).

5. The multi-stage shaking screening device for cereal raw materials according to claim 3 is characterized in that: A plurality of limit strips (17) are fixed at equal angles on the inner ring wall of the screening box (1), and the limit strips (17) are movably inserted into the limit grooves on the outer ring walls of the plurality of filter plates (11).

6. The multi-stage shaking screening device for cereal raw materials according to claim 3, characterized in that: A plurality of stirring rods (18) are arranged at equal angles on the upper side of the filter plate (11), and the stirring rods (18) are fixed on the outer ring wall of the connecting pipe (12-1).

7. The multi-stage shaking screening device for cereal raw materials according to claim 1, characterized in that: The discharging mechanism (13) comprises: Discharge pipes (13-1), there are several discharge pipes (13-1), and they are all arranged in an inverted "L" shape, the horizontal pipes of the discharge pipes (13-1) are inserted into one side of the outer ring wall of the screening box (1) from top to bottom, and the vertical pipes of the discharge pipes (13-1) are arranged from outside to inside; A blocking plate (13-2), wherein there are a plurality of blocking plates (13-2), which are arranged one by one on the inner side of the horizontal pipe of the discharge pipe (13-1), and two adjacent blocking plates (13-2) are connected via a linkage rod (13-3); An adjusting screw (13-4) is screwed into the uppermost sealing plate (13-2) through a thread, and the upper end of the adjusting screw (13-4) passes through the upper side wall of the sealing plate (13-2) and is screwed into the annular wall of the screening box (1) through a bearing. An adjusting motor (13-5) is fixed to the top end of the adjusting screw (13-4), and the adjusting motor (13-5) is embedded in and fixed in the annular wall of the screening box (1).

8. The multi-stage shaking screening method for cereal raw materials according to claim 1, characterized in that: The cereal raw materials enter the dust removal box (8) through the feed hopper (10), and the crushed stones and dust in the cereal raw materials pass through the dust removal net (9) and fall downward to the lower side of the dust removal box (8). The conveying motor (7) is started, and the conveying motor (7) drives the screw conveying rod (6) to rotate. During the rotation process, the screw conveying rod (6) conveys the cereal raw materials upward and enters the screening box (1) through the feed pipe (3). During this process, the shaking mechanism (12) is started, and the filter plate (11) is driven to shake up and down by the shaking mechanism (12), so that the filter plate (11) can be convenient for grading and screening the cereal raw materials. The cereal raw materials filtered by the filter plate (11) are discharged through the discharge mechanism (13).

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