CN111530734A

CN111530734A - Screening device for grain processing and screening method thereof

Info

Publication number: CN111530734A
Application number: CN202010416190.0A
Authority: CN
Inventors: 不公告发明人
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-05-17
Filing date: 2020-05-17
Publication date: 2020-08-14

Abstract

The invention relates to the technical field of grain production and discloses a screening device for grain processing and a screening method thereof. According to the screening device and the screening method for grain processing, the first vertical rod and the second vertical rod which are respectively arranged below the two transverse plates are driven to rotate through the rotating shaft, and the rotating path of the first vertical rod is not overlapped with the rotating path of the second vertical rod, so that grains on the first screen can be well spread evenly by utilizing the mutual matching of the first vertical rod and the second vertical rod, the time of grain moving from the center to the periphery is shortened, the grain screening time is reduced, and the screening efficiency is improved.

Description

Screening device for grain processing and screening method thereof

Technical Field

The invention relates to the technical field of grain production, in particular to a screening device for grain processing and a screening method thereof.

Background

Grain crops mainly comprise corns, wheat, soybeans, sorghum, rice and the like, and in order to ensure the grain quality, the grains need to be screened in time to remove impurities with larger diameters in the grains.

At present generally use vibratory screening machine to filter grain, its theory of operation utilizes the holistic vibrations of sieve separator to filter the grain on its inside screen cloth, grain is concentrated when falling on the screen cloth and falls on the middle part earlier, and a large amount is thicker, then along with vibratory screening's going on, because the excitation force of screen cloth central zone is less than the excitation force of marginal part in the sieve separator, partly grain can be slowly screened down, the regional grain of middle part is slowly by the center to motion all around and thickness slowly reduce, so, grain is longer from central part to the time of motion all around, the screening time that leads to grain is longer, inefficiency.

According to the analysis, during screening, grains are poured into the screen through the feeding hole formed in the middle above the screening device, so that the grains are concentrated in the middle of the screen, and according to the structural characteristics of the screen, the structural strength of the center of the screen is smaller than that of the edge part, so that the middle of the screen is sunken or even damaged along with the impact of the grains during falling, and the service life of the screen is shortened.

The impurity particle diameter that contains in the grain of difference is different, and the screen cloth among the current sieving mechanism is the inside of snap-on at the sieving mechanism, and the diameter of screen cloth can't change, leads to the impurity diameter of sieving mechanism screening comparatively single, if want to filter to the impurity of different diameters size, then need change another sieving mechanism to increased the screening time, increased manufacturing cost again simultaneously.

Grain can mix into the dust when reaping, and when the screening, along with grain motion on the screen cloth, the dust can be followed and entered into the air between the grain, also has a large amount of dusts to scatter into the air from the feed inlet after pouring grain into sieving mechanism inside simultaneously, leads to the production environment to become extremely abominable, is unfavorable for that staff's is healthy.

Disclosure of Invention

The invention provides a screening device for grain processing and a screening method thereof, which have the advantages of shortening screening time, improving screening efficiency, avoiding impact of grains on the middle part to prolong the service life of a screen, enabling the screening device to screen impurities with different diameters, optimizing production environment and solving the problems in the background art.

The invention provides the following technical scheme: a screening device for grain processing comprises a main barrel and a bottom plate, wherein a circular plate is fixedly installed at the top of the bottom plate, a backing plate is arranged at the top of the circular plate, a receiving barrel is arranged above the backing plate, a connecting piece is fixedly sleeved at the bottom of the outer surface of the main barrel, a damping spring is fixedly connected at the bottom of the connecting piece, the bottom end of the damping spring is fixedly connected with the circular plate, a lead screw is fixedly connected at the top of the main barrel, a top plate is movably sleeved on the outer surface of the lead screw, a fixing bolt positioned above the top plate is in threaded connection with the outer surface of the lead screw, the bottom of the top plate is in contact with the top of the main barrel, an air extracting barrel is fixedly connected at the top of the top plate, a feeding funnel is fixedly inserted in the middle of the top surface of the air extracting barrel, a material leaking plate is fixedly connected at the bottom surface of, the outer surface of the dispersing head is fixedly connected with the inner wall of the main barrel through three connecting rods, both sides of the inner wall of the main barrel are fixedly connected with lower connecting blocks, an inner cavity of the main barrel is provided with a second screen positioned above the lower connecting blocks, both sides of the second screen are fixedly connected with upper connecting blocks, the upper connecting blocks and the lower connecting blocks are fixedly connected through screws, the top surface of the second screen is provided with second sieve pores, the edge of the top of the second screen is provided with a circle of positioning holes distributed at equal angles, the middle part of the top surface of the second screen is movably provided with a first screen through a connecting shaft, the outer surface of the first screen is fixedly provided with a blocking piece, the top of the first screen is provided with a first sieve pore, the middle part of the top surface of the first screen is fixedly provided with a central column, and the first screen and the second screen are, the utility model discloses a suction pump, including the roof, medial surface fixedly connected with connection structure, connection structure's bottom surface fixedly connected with driving motor, driving motor's output shaft fixedly connected with axis of rotation, two diaphragms of the bottom fixedly connected with of axis of rotation, two the bottom surface of diaphragm is fixed mounting respectively has first montant and second montant, fixed hole has been seted up at the top of aspirating tube, the inside threaded connection of fixed hole has filtration, the top fixedly connected with air pump of bottom plate, the output tube of the fixedly connected with of the end of giving vent to anger of air pump, fixedly connected with transmission pipe between the end of bleeding of air pump and the filtration.

Preferably, the number of the first vertical rod and the number of the second vertical rod are seven and six, respectively, and the rotation path of the first vertical rod is not overlapped with the rotation path of the second vertical rod.

Preferably, the damping springs are arranged in an equal-angle mode, three handles are arranged on the outer surface of the material receiving barrel in an equal-angle mode, and each handle is located between every two damping springs.

Preferably, the connecting member comprises an outer ring, three driven plates are fixedly mounted on the outer surface of the outer ring, and the three driven plates are distributed on the outer ring at equal angles.

Preferably, the filtering structure comprises a sleeve, the sleeve is in threaded connection with a fixed hole through threads arranged on the outer surface of the sleeve, a sealing plate is fixedly connected to the top of the sleeve, a rotating bearing is fixedly connected to the middle of the top surface of the sealing plate, a filtering plate is fixedly arranged inside the sleeve, filtering holes are formed in the top of the filtering plate, the inside of the rotating bearing is fixedly connected with the top end of a transmission pipe, and an air suction port in the top end of the transmission pipe is located between the filtering plate and the rotating bearing.

Preferably, connection structure is including dividing equally the head, it comprises the circular slab of bottom and the first structure of semicircle at top to divide equally the head, and it is the same with the shape of dispersion head to divide equally the head, the outer fixed surface of the circular slab in dividing equally the head is connected with outer pole, the outer end of outer pole and the inner wall fixed connection of roof.

Preferably, the positioning device comprises a sleeve block, the sleeve block is fixedly connected with the outer surface of the blocking piece, a pull rod is movably sleeved at the middle of the sleeve block, the top of the pull rod is fixedly connected with a pull block, the bottom of the pull rod is fixedly connected with an insertion rod, the bottom of the insertion rod is movably inserted into the positioning hole, an extension spring is movably sleeved on the outer surface of the pull rod, and two ends of the extension spring are respectively fixedly connected with the sleeve block and the baffle.

A screening method of a screening device for grain processing comprises the following steps:

the first step is as follows: firstly, adjusting the diameter of a screen according to the type of grains to be screened and the size of impurities contained in the grains, detaching a filter structure with a transmission pipe from the top of an air suction cylinder, then rotating a fixing bolt to separate the filter structure from a top plate so as to release the fixation of the top plate, and then moving the top plate and the air suction cylinder upwards integrally to finish the detaching work before adjustment;

the second step is that: the pull block is pulled upwards, the extension spring is compressed at the moment, and the inserted bar moves out of the positioning hole, so that the fixing effect on the first screen and the second screen is eliminated, then the first screen is rotated, the first screen hole and the second screen hole are staggered, the diameter during blanking is changed, impurities with larger diameters cannot be clamped between the first screen hole and the second screen hole due to the vibration of the first screen hole and the second screen hole, after the proper diameter is adjusted, the pull block is loosened, the extension spring is restored to an uncompressed state at the moment, the inserted bar is driven to be inserted into the positioning hole, and then the adjusting work before screening is completed;

the third step: will connect the storage bucket to place the below at the main section of thick bamboo, then start driving motor and air pump and vibrating motor, pour grain into from feed hopper after that, the grain of whereabouts is touch and is evenly split after the head can be even to disperse all around and open, fall between the center post on first screen cloth and the piece that stops at last, the driving motor can drive first montant and second montant and shakeouts grain and mix this moment, the less grain of diameter falls in connecing the storage bucket through the hourglass flitch after being sieved, and the dust passes through filtration of filtration, the dust is taken away the processing, thereby the screening work of grain has been accomplished.

Preferably, the backing plate is made of rubber, and the material receiving barrel is placed in the middle of the top surface of the backing plate and under the material leaking plate.

Preferably, the transfer tube is a flexible tube that can be twisted and rotated in a counter-clockwise direction when the filter structure is removed, and the sleeve is rotated without the top end of the transfer tube rotating therewith.

The invention has the following beneficial effects:

1. this sieving mechanism for grain processing, fall in non-central region when passing through the grain blanking, it drives whole sieving mechanism vibrations to be provided with vibrating motor again, thereby when making first screen cloth carry out the vibrations screening to the grain of its top, the driving motor who utilizes the setting drives the axis of rotation and rotates, make the axis of rotation drive first montant and the second montant that two diaphragm below set up respectively rotate, because the rotation path of first montant does not coincide with the rotation path of second montant, so, utilize mutually supporting of first montant and second montant, can be better to the grain on the first screen cloth stand evenly, thereby shorten the time of grain from central point to the all around motion, reduce the time that the grain was screened, the screening efficiency is improved.

2. This sieving mechanism for grain processing is equipped with connection structure through being equipped with directly over under feed hopper and first screen cloth central zone for the material at first falls on the surface of semicircular equipartition head, and grain can be even this moment to dispersion all around, has avoided the direct central part that falls on first screen cloth of grain, has avoided the impact of grain to first screen cloth central part, thereby has improved the life of first screen cloth.

3. This sieving mechanism for grain processing, make through the connecting axle and can rotate between first screen cloth and the second screen cloth, take place to rotate the back, can take place suitable dislocation between first screen hole and the second screen hole, utilize the effect of covering of first screen cloth to the second screen hole, thereby play the effect that changes second screen hole unloading diameter, make a sieving mechanism in this application can filter the impurity of different diameters, the suitability of this application has been increased, the cost of production has been reduced, cooperation between utilizing positioner and the locating hole simultaneously makes and is fixed between first screen cloth and the second screen cloth, avoid taking place the motion between first screen cloth and the second screen cloth among the screening process, thereby stability when having increased the screening.

4. This sieving mechanism is used in grain processing, top through at the exhaust pump is equipped with filtration, after starting the air pump, the transmission pipe passes through filtration and sucks the inside dust of sieving mechanism, utilize the inside filter and the filtration pore of crossing that sets up of filtration simultaneously, make the assurance only can pass through filtration by the dust, prevent that a small amount of grain and the lighter impurity of weight from being taken out, also can pass through the dust of sieving mechanism top and be taken out through feed hopper, also avoided the dust to pass through in the feed hopper flow direction air, thereby the operational environment has been optimized, the injury to the staff has been reduced.

Drawings

FIG. 1 is an external view of the present invention;

FIG. 2 is a schematic view of the internal structure of the present invention;

FIG. 3 is a schematic view of the construction of the connector of the present invention;

FIG. 4 is a schematic bottom structure of the main cartridge of the present invention;

FIG. 5 is an exploded view of the structure of the filter structure of the present invention;

FIG. 6 is a schematic structural view of a connection structure according to the present invention;

FIG. 7 is a top view of a first screen of the present invention construction;

FIG. 8 is a schematic view of the arrangement of the first and second vertical posts of the present invention;

FIG. 9 is a schematic view of the structure of the blocking member of the present invention;

FIG. 10 is a schematic view of a positioning device according to the present invention;

FIG. 11 is a schematic illustration of the separation of a first screen from a second screen in the configuration of the present invention;

FIG. 12 is a schematic view of the installation of the upper and lower connector blocks of the present invention.

In the figure: 1. a main barrel; 2. a base plate; 3. a connecting member; 3001. an outer ring; 3002. a passive plate; 4. a damping spring; 5. a circular plate; 6. a base plate; 7. a receiving barrel; 8. a screw rod; 9. a top plate; 10. fixing the bolt; 11. an air pumping cylinder; 12. a feed hopper; 13. fixing the hole; 14. a filter structure; 141. a sleeve; 142. a sealing plate; 143. a filter plate; 144. a filtration pore; 145. a rotating bearing; 15. an upper connecting block; 16. a lower connecting block; 17. a handle; 18. a screw; 19. a second sieve pore; 20. positioning holes; 21. a connecting shaft; 22. a blocking member; 23. a first screen; 24. a first screen hole; 25. a central column; 26. a positioning device; 261. sleeving blocks; 262. a pull rod; 263. pulling the block; 264. a baffle plate; 265. inserting a rod; 266. an extension spring; 27. a connecting structure; 271. evenly dividing heads; 272. an outer rod; 28. a drive motor; 29. a rotating shaft; 30. a transverse plate; 31. a first vertical bar; 32. a second vertical bar; 33. a conveying pipe; 34. a material leaking plate; 35. an air pump; 36. an output pipe; 37. a dispersion head; 38. a vibration motor; 39. a connecting rod; 40. a second screen.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-12, a screening device for grain processing comprises a main barrel 1 and a bottom plate 2, a circular plate 5 is fixedly installed on the top of the bottom plate 2, a backing plate 6 is installed on the top of the circular plate 5, a receiving barrel 7 is installed above the backing plate 6, a connecting piece 3 is fixedly sleeved on the bottom of the outer surface of the main barrel 1, a damping spring 4 is fixedly connected on the bottom of the connecting piece 3, the bottom end of the damping spring 4 is fixedly connected with the circular plate 5, a lead screw 8 is fixedly connected on the top of the main barrel 1, a top plate 9 is movably sleeved on the outer surface of the lead screw 8, a fixing bolt 10 positioned above the top plate 9 is in threaded connection with the outer surface of the lead screw 8, the bottom of the top plate 9 is contacted with the top of the main barrel 1, an air suction barrel 11 is fixedly connected on the top of the top plate 9, a feeding funnel 12 is fixedly inserted in the middle of the top surface, the bottom of the dispersing head 37 is fixedly provided with a vibrating motor 38, the outer surface of the dispersing head 37 is fixedly connected with the inner wall of the main barrel 1 through three connecting rods 39, both sides of the inner wall of the main barrel 1 are fixedly connected with lower connecting blocks 16, the inner cavity of the main barrel 1 is provided with a second screen 40 positioned above the lower connecting blocks 16, both sides of the second screen 40 are fixedly connected with upper connecting blocks 15, the upper connecting blocks 15 and the lower connecting blocks 16 are fixedly connected through screws 18, the top surface of the second screen 40 is provided with second screen holes 19, the edge of the top of the second screen 40 is provided with a circle of positioning holes 20 distributed at equal angles, the middle part of the top surface of the second screen 40 is movably provided with a first screen 23 through a connecting shaft 21, the outer surface of the first screen 23 is fixedly provided with a blocking part 22, the top part of the first screen 23 is provided with a first screen hole, through positioner 26 fixed connection between first screen cloth 23 and the second screen cloth 40, the medial surface fixedly connected with connection structure 27 of roof 9, connection structure 27's bottom surface fixedly connected with driving motor 28, driving motor 28's output shaft fixedly connected with axis of rotation 29, two diaphragms 30 of the bottom fixedly connected with of axis of rotation 29, there are first montant 31 and second montant 32 in the bottom surface of two diaphragms 30 fixed mounting respectively, fixed orifices 13 has been seted up at the top of aspirating tube 11, the internal thread of fixed orifices 13 is connected with filtration 14, the top fixedly connected with air pump 35 of bottom plate 2, the output tube 36 of the fixedly connected with of air pump 35, fixedly connected with transmission pipe 33 between the end of bleeding of air pump 35 and the filtration 14.

The number of the first vertical rods 31 and the number of the second vertical rods 32 are seven and six respectively, the rotating path of the first vertical rods 31 is not overlapped with the rotating path of the second vertical rods 32, and the number of the seven first vertical rods 31 and the number of the six second vertical rods 32 are set, so that the six second vertical rods 32 can fill up the holes in the seven first vertical rods 31, the seven first vertical rods 31 and the six second vertical rods 32 can completely flatten and stir grains when rotating, and the screening efficiency is improved.

Wherein, damping spring 4 wait the angle and be equipped with threely, connect the surface of storage bucket 7 wait the angle and install three handle 17, and each handle 17 is located between per two damping spring 4, because the hole between per two damping spring 4 all is greater than the diameter that connects storage bucket 7, so, after the screening work is accomplished, can will connect the convenient taking out of storage bucket 7 through handle 17.

The connecting piece 3 comprises an outer ring 3001, three driven plates 3002 are fixedly mounted on the outer surface of the outer ring 3001, the three driven plates 3002 are distributed on the outer ring 3001 at equal angles, and the three driven plates 3002 and the damping spring 4 are arranged correspondingly to ensure the stability during vibration.

Wherein, the filtering structure 14 includes a sleeve 141, the sleeve 141 is in threaded connection with the fixed hole 13 through a thread arranged on the outer surface, a sealing plate 142 is fixedly connected to the top of the sleeve 141, a rotating bearing 145 is fixedly connected to the middle of the top surface of the sealing plate 142, a filtering plate 143 is fixedly arranged inside the sleeve 141, a filtering hole 144 is formed at the top of the filtering plate 143, the inside of the rotating bearing 145 is fixedly connected to the top end of the transmission pipe 33, an air suction port at the top end of the transmission pipe 33 is located between the filtering plate 143 and the rotating bearing 145, the diameter of the filtering hole 144 is small, only dust with a small diameter is allowed to pass through, grains and impurities with a large diameter are prevented from being sucked away, and through the rotating bearing 145, the sleeve 141 and the transmission pipe 33 can rotate relatively, and it is ensured that the top end of the transmission pipe.

Wherein, connection structure 27 is including dividing equally the head 271, divide equally the head 271 by the circular slab of bottom and the first structure of semicircle at top and constitute, and it is the same with dispersion head 37's shape to divide equally the head 271, the outer fixed surface who divides the circular slab in the head 271 is connected with outer pole 272 equally, the outer end of outer pole 272 and the inner wall fixed connection of roof 9, set into the semicircle head structure through the top with dividing equally the head 271, make when the feeding, the material can not fall in the central zone of first screen cloth 23, but even dispersion falls on first screen cloth 23 and blocks between 22 and the center post 25, the material thickness that has also guaranteed to fall on first screen cloth 23 simultaneously is unanimous basically.

Wherein, positioner 26 is including a cover block 261, cover block 261 and the outer fixed surface who stops 22 are connected, the pull rod 262 has been cup jointed in the middle part activity of cover block 261, the top fixedly connected with of pull rod 262 draws block 263, the bottom fixedly connected with inserted bar 265 of pull rod 262, the bottom and the locating hole 20 activity of inserted bar 265 are pegged graft, extension spring 266 has been cup jointed in the outer surface activity of pull rod 262, extension spring 266's both ends respectively with cover block 261 and baffle 264 fixed connection, can provide fixedly for first screen cloth 23 and second screen cloth 40 through being provided with positioner 26, avoid the in-process at the screen cloth because take place the displacement and influence the accuracy nature of screening between the effect first screen cloth 23 of vibrations and the second screen cloth 40.

The screening method of the screening device for grain processing comprises the following steps:

the first step is as follows: firstly, adjusting the diameter of a screen according to the type of grains to be screened and the size of impurities contained in the grains, detaching a filtering structure 14 with a transmission pipe 33 from the top of an air extraction cylinder 11, then rotating a fixing bolt 10 to separate the filtering structure from a top plate 9 so as to release the fixation of the top plate 9, and then moving the top plate 9 and the air extraction cylinder 11 integrally upwards to finish the detaching work before adjustment;

the second step is that: the pulling block 263 is pulled upwards, the extension spring 266 is compressed at the moment, and meanwhile, the inserting rod 265 moves out of the positioning hole 20, so that the fixing effect on the first screen 23 and the second screen 40 is removed, then the first screen 23 is rotated, so that the first screen 24 and the second screen 19 are staggered, the diameter during blanking is changed, impurities with larger diameters cannot be clamped between the first screen 24 and the second screen 19 due to the vibration of the first screen 24 and the second screen 19, after the proper diameter is adjusted, the pulling block 263 is loosened, the extension spring 266 is restored to an uncompressed state at the moment, the inserting rod 265 is driven to be inserted into the positioning hole 20, and then the adjusting work before screening is completed;

the third step: will receive storage bucket 7 and place the below at main section of thick bamboo 1, then start driving motor 28 and air pump 35 and vibrating motor 38, pour grain into from feed hopper 12 subsequently, the grain of whereabouts can be even after touchhing head 271 and disperse all around and open, fall between central post 25 on first screen cloth 23 and the piece 22 that stops at last, driving motor 28 can drive first montant 31 and second montant 32 and shakeout the stirring to grain this moment, the less grain of diameter falls in receiving bucket 7 through material leaking board 34 after being sieved, and the dust passes through filtration of filtration 14, the dust is taken out the processing, thereby the screening work of grain has been accomplished.

Wherein, backing plate 6 is formed by the rubber preparation, and backing plate 6 that rubber was made has good cushioning effect, avoids connecing the material bucket 7 to take place to remove at the in-process that connects the material, and leads to the unrestrained phenomenon of grain, connects the material bucket 7 to place in the middle part of backing plate 6 top surface and under leaking the flitch 34, guarantees to connect the accuracy when connecing the material.

Wherein, the transmission pipe 33 is the elasticity hose that can twist, guarantees that transmission pipe 33 can take place the deformation after dismantling filter structure 14 to can place filter structure 14 in suitable position, and for anticlockwise reverse direction rotation when dismantling filter structure 14, and sleeve 141 rotates, and the top of transmission pipe 33 is not followed and is rotated together.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a sieving mechanism for grain processing, includes a main section of thick bamboo (1) and bottom plate (2), its characterized in that: a circular plate (5) is fixedly mounted at the top of the bottom plate (2), a backing plate (6) is arranged at the top of the circular plate (5), a material receiving barrel (7) is arranged above the backing plate (6), a connecting piece (3) is fixedly sleeved at the bottom of the outer surface of the main barrel (1), a damping spring (4) is fixedly connected at the bottom of the connecting piece (3), the bottom end of the damping spring (4) is fixedly connected with the circular plate (5), a lead screw (8) is fixedly connected at the top of the main barrel (1), a top plate (9) is movably sleeved at the outer surface of the lead screw (8), a fixing bolt (10) positioned above the top plate (9) is in threaded connection with the outer surface of the lead screw (8), the bottom of the top plate (9) is in contact with the top of the main barrel (1), an air suction barrel (11) is fixedly connected at the top of the top plate (9), a feeding funnel (12) is fixedly, the bottom surface of the main cylinder (1) is fixedly connected with a material leaking plate (34), the bottom of the inner cavity of the main cylinder (1) is provided with a dispersing head (37), the bottom of the dispersing head (37) is fixedly provided with a vibrating motor (38), the outer surface of the dispersing head (37) is fixedly connected with the inner wall of the main cylinder (1) through three connecting rods (39), both sides of the inner wall of the main cylinder (1) are fixedly connected with lower connecting blocks (16), the inner cavity of the main cylinder (1) is provided with a second screen (40) positioned above the lower connecting blocks (16), both sides of the second screen (40) are fixedly connected with upper connecting blocks (15), the upper connecting blocks (15) and the lower connecting blocks (16) are fixedly connected through screws (18), the top surface of the second screen (40) is provided with second screen holes (19), the edge of the top of the second screen (40) is provided with a circle of positioning holes (20) distributed at equal angles, the middle part of the top surface of the second screen (40) is movably provided with a first screen (23) through a connecting shaft (21), the outer surface of the first screen (23) is fixedly provided with a blocking part (22), the top part of the first screen (23) is provided with a first screen hole (24), the middle part of the top surface of the first screen (23) is fixedly provided with a center column (25), the first screen (23) is fixedly connected with the second screen (40) through a positioning device (26), the inner side surface of the top plate (9) is fixedly connected with a connecting structure (27), the bottom surface of the connecting structure (27) is fixedly connected with a driving motor (28), the output shaft of the driving motor (28) is fixedly connected with a rotating shaft (29), the bottom end of the rotating shaft (29) is fixedly connected with two transverse plates (30), and the bottom surfaces of the transverse plates (30) are respectively and fixedly provided with a first vertical rod (31) and a second, fixed hole (13) have been seted up at the top of aspiration tube (11), the inside threaded connection of fixed hole (13) has filtration (14), the top fixedly connected with air pump (35) of bottom plate (2), the output tube (36) of the end fixedly connected with of giving vent to anger of air pump (35), fixedly connected with transmission pipe (33) between the end of bleeding of air pump (35) and filtration (14).

2. The screening device of claim 1, wherein the screening device comprises: the number of the first vertical rod (31) and the number of the second vertical rod (32) are seven and six respectively, and the rotating path of the first vertical rod (31) is not overlapped with the rotating path of the second vertical rod (32).

3. The screening device of claim 1, wherein the screening device comprises: damping spring (4) are equipped with threely with the angle, connect the surface of storage bucket (7) and install three handle (17) with the angle, each handle (17) are located between per two damping spring (4).

4. The screening device of claim 1, wherein the screening device comprises: the connecting piece (3) comprises an outer ring (3001), three driven plates (3002) are fixedly mounted on the outer surface of the outer ring (3001), and the three driven plates (3002) are distributed on the outer ring (3001) at equal angles.

5. The screening device of claim 1, wherein the screening device comprises: filtration (14) is including sleeve (141), screw thread and fixed hole (13) threaded connection that sleeve (141) were equipped with through the surface, the top fixedly connected with closing plate (142) of sleeve (141), the middle part fixedly connected with rolling bearing (145) of closing plate (142) top surface, the inside fixed mounting of sleeve (141) has filter (143), filter hole (144) have been seted up at the top of filter (143), the inside of rolling bearing (145) and the top fixed connection of transmission pipe (33), and the extraction opening on transmission pipe (33) top is located between filter (143) and rolling bearing (145).

6. The screening device of claim 1, wherein the screening device comprises: connection structure (27) are including dividing equally head (271), divide equally head (271) to comprise the circular slab of bottom and the semicircle head structure at top, and divide equally head (271) and disperse the shape of head (37) the same, the fixed surface of the circular slab in dividing equally head (271) is connected with outer pole (272), the outer end of outer pole (272) and the inner wall fixed connection of roof (9).

7. The screening device of claim 6, wherein the screening device comprises: positioner (26) are including cover block (261), the outer fixed surface of cover block (261) and stopper (22) is connected, pull rod (262) have been cup jointed in the middle part activity of cover block (261), the top fixedly connected with pull block (263) of pull rod (262), the bottom fixedly connected with inserted bar (265) of pull rod (262), the bottom and locating hole (20) activity of inserted bar (265) are pegged graft, extension spring (266) have been cup jointed in the outer surface activity of pull rod (262), the both ends of extension spring (266) respectively with cover block (261) and baffle (264) fixed connection.

8. The screening method of the screening apparatus for grain processing according to claim 7, comprising the steps of:

the first step is as follows: firstly, adjusting the diameter of a screen according to the type of grains to be screened and the size of impurities contained in the grains, detaching a filtering structure (14) with a transmission pipe (33) from the top of an air extraction cylinder (11), then rotating a fixing bolt (10) to separate the filtering structure from a top plate (9) so as to release the fixation of the top plate (9), and then moving the top plate (9) and the air extraction cylinder (11) upwards integrally to finish the detaching work before adjustment;

the second step is that: the pulling block (263) is pulled upwards, the extension spring (266) is compressed at the moment, and meanwhile, the inserting rod (265) moves out of the positioning hole (20), so that the fixing effect on the first screen (23) and the second screen (40) is removed, then the first screen (23) is rotated, so that the first screen (24) and the second screen (19) are staggered, the diameter during blanking is changed, impurities with larger diameters cannot be clamped between the first screen (24) and the second screen (19) due to the vibration of the first screen (24) and the second screen (19), after the proper diameter is adjusted, the pulling block (263) is loosened, the extension spring (266) recovers an uncompressed state at the moment, the inserting rod (265) is driven to be inserted into the positioning hole (20), and then the adjusting work before screening is finished;

the third step: will connect storage bucket (7) to place in the below of a main section of thick bamboo (1), then start driving motor (28) and air pump (35) and vibrating motor (38), pour grain into from feed hopper (12) in succession, the grain of whereabouts is touch and evenly can be dispersed to all around after head (271) is divided, center post (25) that finally falls on first screen cloth (23) with block between piece (22), driving motor (28) can drive first montant (31) and second montant (32) and shakeouts the stirring to grain this moment, the less grain of diameter is fallen through hourglass flitch (34) after being sieved in receiving bucket (7), and the dust passes through the filtering action of filtration (14), the dust is taken out and is handled, thereby the screening work of grain has been accomplished.

9. The screening method of the screening apparatus for grain processing according to claim 8, wherein: the backing plate (6) is made of rubber, and the material receiving barrel (7) is placed in the middle of the top surface of the backing plate (6) and right below the material leaking plate (34).

10. The screening method of the screening apparatus for grain processing according to claim 8, wherein: the transmission pipe (33) is a flexible hose capable of being twisted and rotates anticlockwise when the filtering structure (14) is disassembled, and the sleeve (141) rotates, but the top end of the transmission pipe (33) does not rotate along with the transmission pipe.