CN115591681A

CN115591681A - Wheat seed grain screening plant

Info

Publication number: CN115591681A
Application number: CN202211161251.9A
Authority: CN
Inventors: 丁文金; 张海鹏; 方凡; 黄正来; 王鹏举
Original assignee: Anhui Agricultural University AHAU
Current assignee: Anhui Agricultural University AHAU
Priority date: 2022-09-23
Filing date: 2022-09-23
Publication date: 2023-01-13
Anticipated expiration: 2042-09-23

Abstract

The invention relates to a wheat grain screening device which comprises a rack, wherein a screening shell is fixedly installed in the rack, a feeding port is formed in the top of the screening shell, a vibration screening layer, a rotary separating layer and a discharging port are sequentially arranged in the screening shell from top to bottom, mature wheat can be placed into screening equipment, residual straws and small-particle impurities of the wheat are removed under the structural action of the vibration screening layer and the rotary separating layer, full and complete glumes are obtained, and the wheat grain screening treatment is completed.

Description

Wheat seed grain screening plant

Technical Field

The invention relates to the technical field of wheat screening equipment, in particular to a wheat grain screening device.

Background

Wheat is a general term of wheats, common wheat is gramineae and is a cereal crop widely planted around the world, the caryopsis of wheat is one of staple food of human beings, the caryopsis of wheat can be ground into flour to be made into bread, steamed bread, biscuits, noodles and other foods, the flour can be fermented to be made into beer, alcohol, white spirit or biomass fuel, the wheat needs to be filtered and screened during the processing of the wheat, and the screening mainly aims to separate wheat particles from impurities.

In current wheat seed grain screening installation, chinese patent for CN212468855U if the notice number, it discloses a wheat screening plant, including triangular supports frame, triangular supports frame's top fixedly connected with box, the feed inlet has been seted up at the top of box, the discharge gate has been seted up to the bottom of box, the equal joint in both sides at box top has the L template, fixedly connected with filter screen between the L template, the outside one side fixed mounting of box has the fan, the inside one side fixedly connected with collecting box of box, the mounting groove has all been seted up to the inside both sides of box, the inside fixedly connected with damping spring of mounting groove, through being provided with L template and filter screen etc., make this wheat screening plant can not only sieve the less and great impurity of weight of granule in mixing in the wheat, and can sieve great granule and lighter impurity.

In the prior art, the wheat is screened by the filter screen and the fan, but in the prior art, only the wheat stays on the filter screen layer in the process of screening small-particle impurities, a large amount of screened wheat and unscreened wheat are stacked together to influence the screening efficiency, and the stacked state ensures that small-particle impurities mixed in the wheat are not easy to screen out, the screening effect cannot be ensured, and the screening quality is influenced; in the above-mentioned prior art of second aspect, wheat easily produces the phenomenon of jam mesh when the filter screen layer is sieved, can't let wheat evenly pass through the filter screen, influences screening efficiency.

Disclosure of Invention

In order to remove residual straw and small-particle impurities from mature wheat ears, obtain full and complete caryopses and complete screening treatment of wheat grains, the application specially provides a wheat grain screening device.

The utility model provides a wheat seed grain screening plant, includes the frame, the inside fixed mounting of frame has the screening shell, and the pan feeding mouth has been seted up at screening shell top, and the screening shell is inside by last vibrating screen layer, rotation separating layer and the discharge gate of having set gradually under to.

Preferably, the rotation separation layer comprises a chassis, an electric turntable, a spiral frame, a sieving barrel, an air blowing brush, a bottom air pump, a fixed barrel and an air shaft, wherein the chassis is arranged inside the sieving shell, the electric turntable with an annular structure is arranged on the chassis, the air shaft with a cavity structure is arranged in the middle of the electric turntable, the spiral frame is arranged on an outer sleeve of the air shaft, the rotation direction of the electric turntable is the ascending spiral direction of the spiral frame, the outer edge of the spiral frame is tightly attached to the inner wall of the fixed barrel, the spiral frame can upwards transmit the spiral of wheat, the lower end of the fixed barrel is fixedly arranged on the chassis, a through groove is uniformly formed in the lower end of the fixed barrel, the wheat can enter the bottom of the spiral frame due to the formation of the through groove, the sieving barrel which is positioned outside the fixed barrel is fixedly arranged on the chassis, a groove rail is formed in the inner side wall of the sieving shell, the air blowing brush is arranged on the groove rail through an electric sliding block, a hollow cross beam is arranged at the lower end of the sieving shell, the bottom air pump is arranged in the middle of the cross beam, the bottom air pump is provided with the bottom air pump, and the rotation cooperation of the air shaft, so as to ensure that the air tightness of the air pump output from the bottom to smoothly reach the top of the air shaft, and avoid air shaft.

Preferably, the vibrating screening layer comprises a rotating shaft linkage unit, a fitting frame, a swinging layer, elastic cloth, a reset spring, a vibrating layer and an article discharge opening, the middle of the screening shell is provided with the fitting frame, the fitting frame is in an outward convex circular arc annular structure, the vibrating screening shell aims to facilitate swinging motion of the swinging layer, the rotating shaft linkage unit is symmetrically arranged inside the fitting frame, the swinging layer capable of swinging back and forth is arranged between the rotating shaft linkage units, the edge of the swinging layer is connected with one end of the reset spring, the other end of the reset spring is connected with the lower surface of the vibrating layer, the elastic cloth arranged in an annular mode is connected between the swinging layer and the vibrating layer, the reset spring is arranged outside the elastic cloth in a surrounding mode, sieve holes are uniformly formed in the surfaces of the vibrating layer and the swinging layer, large impurities can be blocked by the sieve holes in the vibrating layer, the sieve holes are formed in the elastic cloth, the article discharge opening is formed in the upper end of the screening shell, and an opening and closing switch is formed in the article discharge opening.

Preferably, the rotating shaft linkage unit comprises a motor, a conveyor belt, a driving shaft, a driven shaft, a driving gear, a driven gear and a cam, wherein the motor is installed on the inner wall of the fitting frame, an output shaft of the motor is fixedly connected with the side wall of the swinging layer, the output shaft of the motor is connected with the driving shaft through the conveyor belt, the driving gear is installed at one end of the driving shaft, the driven gear is installed at one end of the driven shaft, the driving shaft and the driven shaft are rotatably installed on the inner side wall of the fitting frame, the driving gear is meshed with the driven gear, the diameter of the driving gear is larger than that of the driven gear, the cam is sleeved on the driven shaft, the cam is in intermittent fit with the vibrating layer, the diameter of the driving gear 415 is larger than that of the driven gear 416, the rotating speed of the driven gear 416 is relatively faster, the cam 417 acts on the vibrating layer 46 more frequently, and the vibration frequency is increased.

As preferred, the chassis includes flourishing material and holds in the palm, open-close board and cylinder, and the flourishing material is installed to the inner wall of screening shell and is held in the palm, evenly is provided with the arc passageway on the flourishing material holds in the palm, and the arc passageway is connected with the open-close board through the hinge, installs the cylinder through the round pin axle on the bottom air pump, and the round pin hub connection is passed through on the top of open-close board and cylinder.

Preferably, the screening cylinder comprises a ring cylinder and a screening net, the ring cylinder is fixedly installed on the chassis, the screening net is evenly installed at the upper end of the ring cylinder, and small-particle stone impurities can be filtered out through the mesh size of the screening net.

As preferred, the air-blowing brush include the air-blowing pump, the intercommunication hose, the sliding plate, the brush hair, electronic slider, screening shell outer wall symmetry is provided with the base, the inside air-blowing pump that is provided with of base, be connected with the intercommunication hose between air-blowing pump and the air-blowing passageway, the air-blowing passageway is seted up on the sliding plate, the brush hair is evenly installed from last down to the internal surface of sliding plate, the sliding plate sets up on electronic slider, electronic slider installs the inner wall at the screening shell, and the sliding plate of initial position is located the below of screening net, the sliding plate surface evenly seted up with air-blowing passageway intercommunication gas pocket, and from last down in proper order staggered arrangement between gas pocket and the brush hair.

Preferably, the surface of the outer wall of the upper end of the ventilation shaft is uniformly provided with ventilation holes, the ventilation holes are communicated with the cavity, the ventilation holes discharge airflow to act on wheat, the centrifugal rotation is assisted, the acting force for sieving the wheat is enhanced, the lower end of the ventilation shaft is of an open structure, and the ventilation shaft can be communicated with the air pump at the bottom due to the arrangement of the open structure.

Preferably, the discharge port comprises a seed outlet, an impurity outlet and a separating ring, the separating ring is fixedly arranged on the lower surface of the chassis, the seed outlet is arranged in the separating ring, and the separating ring and the screening shell form the impurity outlet.

In summary, the present application includes at least one of the following beneficial technical effects:

1. in order to realize that the wheat can be in a scattered motion state in the screening process, the full action with the screening mechanism is ensured, and the screening efficiency is improved, the vibration screening layer is designed to swing under the action of the rotating shaft linkage unit, the swinging motion enables the wheat to be uniformly distributed on the vibration layer to avoid the accumulation condition, meanwhile, the wheat is in a motion state all the time under the rotation driving of the spiral frame through the structural design of the spiral frame, the spiral frame conveys the screened wheat to the top again for repeated centrifugal screening, the wheat is further screened, the screened wheat is in a dynamic balance motion state for carrying out screening again all the time in the screening process, the generation of the accumulation condition is avoided, the screening frequency is increased, and the screening effect is enhanced.

2. In order to clear up the blockage on the screening net, the air-blowing brush is arranged outside the screening cylinder, the wheat clamped on the screening net is mechanically brushed through the brush on the air-blowing brush, so that the wheat falls off, meanwhile, the air holes blow air into the screening cylinder, so that the fallen wheat is blown into the screening cylinder again to be screened again, the screening net on the rotary separating layer is not easy to block while the screening effect is enhanced, the wheat screening work is accelerated, the impurities on the screen are not required to be manually removed, and the work load of a user is reduced.

Drawings

The invention is further illustrated by the following examples in conjunction with the drawings.

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a cross-sectional view of the present invention;

FIG. 3 is a schematic view of the internal structure of the present invention;

FIG. 4 is a schematic illustration of the construction of the vibrating screening layer of the present invention;

FIG. 5 is an enlarged view of FIG. 4 of the present invention;

FIG. 6 is a schematic structural view of a rotary shaft linkage unit according to the present invention;

FIG. 7 is a schematic view of the air-blowing brush of the present invention;

fig. 8 is a schematic structural view of the helical shelf of the present invention.

Description of reference numerals: 1. a frame; 2. screening the outer shell; 3. a feeding port; 4. vibrating a screening layer; 41. a rotating shaft linkage unit; 411. a motor; 412. a conveyor belt; 413. driving shaft (ii) a; 414. a driven shaft; 415. a driving gear; 416. a driven gear; 417. a cam; 42. fitting the frame; 43. a wobble layer; 44. an elastic cloth; 45. a return spring; 46. a vibration layer; 47. a material discharge port; 5. rotating the separation layer; 51. a chassis; 511. a material containing support; 512. opening and closing the board; 513. a cylinder; 52. an electric turntable; 53. a spiral frame; 54. a screening drum; 541. a ring cylinder; 542. screening the net; 55. an air-blowing brush; 551. an air blast pump; 552. a communication hose; 553. a sliding plate; 554. brushing; 555. an electric slider; 56. a bottom air pump; 57. a fixed cylinder; 58. a ventilation shaft; 6. a discharge port; 61. a kernel outlet 62 and an impurity outlet; 63. a separating ring.

Detailed Description

The present application is described in further detail below with reference to figures 1-8.

The embodiment of the application discloses wheat seed grain screening plant can put into screening equipment with ripe ear of wheat, makes wheat remove vacant shell and impurity under the auxiliary action of equipment inner structure to obtain full complete glume, accomplish the equipment of handling to the wheat seed grain screening.

The first embodiment is as follows:

referring to fig. 1, 2 and 3, the wheat grain screening device disclosed in this embodiment includes a frame 1, and is characterized in that: the inside fixed mounting of frame 1 has screening shell 2, and pan feeding mouth 3 has been seted up at screening shell 2 top, and screening shell 2 is inside to have set gradually vibration screening layer 4, rotation separation layer 5 and discharge gate 6 from the top down.

The rotary separation layer 5 comprises a chassis 51, an electric rotating disc 52, a spiral frame 53, a sieving cylinder 54, an air blowing brush 55, a bottom air pump 56, a fixed cylinder 57 and an air shaft 58, wherein the chassis 51 is arranged inside the sieving shell 2, the electric rotating disc 52 with an annular structure is arranged on the chassis 51, the air shaft 58 with a cavity structure is arranged in the middle of the electric rotating disc 52, the spiral frame 53 is sleeved outside the air shaft 58, the outer edge of the spiral frame 53 is tightly attached to the inner wall of the fixed cylinder 57, the lower end of the fixed cylinder 57 is fixedly arranged on the chassis, through grooves are uniformly formed in the lower end of the fixed cylinder 57, the sieving cylinder 54 positioned outside the fixed cylinder 57 is fixedly arranged on the chassis, a groove track is formed in the inner side wall of the sieving shell 2, the air blowing brush 55 is slidably arranged on the groove track through an electric sliding block, a cross beam with a hollow structure is arranged at the lower end of the sieving shell 2, the bottom air pump 56 is arranged in the middle of the cross beam, and the air pump 56 is arranged in air-tight rotary fit between the air outlet of the bottom air pump 56 and the lower end of the cavity formed by the air shaft 58.

The chassis 51 includes that flourishing material holds in the palm 511, open-close board 512 and cylinder 513, and flourishing material holds in the palm 511 is installed to the inner wall of screening shell 2, and flourishing material evenly is provided with the arc passageway on holding in the palm 511, and the arc passageway is connected with open-close board 512 through the hinge, installs cylinder 513 through the round pin axle on the bottom air pump 56, and the top of open-close board 512 and cylinder 513 is through the round pin hub connection.

The screening cylinder 54 comprises a ring cylinder 541 and a screening net 542, the ring cylinder 541 is fixedly installed on the chassis 51, and the screening net 542 is evenly installed at the upper end of the ring cylinder 541.

In the actual screening process, mature wheat ears are placed into the feeding port 3, the wheat ears fall on the vibration screening layer 4 through the feeding port 3, the vibration screening layer 4 performs mechanical vibration screening on the wheat ears, larger shells and straw residues are left on the vibration screening layer 4 to be screened and then discharged out of the equipment, wheat ear grains and small particle stones meeting the screening mesh standard continue to enter the rotary separation layer 5 through vibration screening, the wheat ears primarily screened fall on the spiral frame 53, the spiral frame 53 is driven by the electric rotating disc 52 to rotate, the wheat ears on the spiral frame 53 are scattered and move around under the action of centrifugal force and air blowing on an air shaft, the flying wheat ears are blocked by the screening mesh 542, meanwhile, small particle impurities mixed in the wheat ear grains are removed by the screening mesh 542, the wheat ears meeting the standard are blocked in the ring barrel 541 by the screening mesh 542, and in the screening process, the ears and particle impurities clamped on the sieving net 542 are brushed into the annular cylinder 541 again by virtue of the up-and-down movement of the air-blowing brush 55, the full ears screened by the sieving net 542 fall and enter the bottom of the spiral frame 53 from the through groove position, the spiral frame 53 rotating at a high speed is matched with the fixed cylinder 57 to spirally lift and convey the full ears to the top of the spiral frame 53, the full ears are scattered to the periphery under the action of centrifugal force again, the ears are conveyed in a reciprocating lifting manner by the high-speed rotation of the spiral frame 53, so that the circulating centrifugal sieving work is carried out, the small particle impurities are fully separated from the full ears, after the circulating sieving is carried out for multiple times, the electric rotary disc 52 stops running, the opening plate 512 is opened under the driving of the air cylinder 513, the full ears fall into the discharge hole 6 through the arc-shaped channel, and the sieving work of sieving of the ears is completed, compared with the existing sieving equipment, through using spiral centrifugal rotary mechanism, carry out repeated screening to the ear of wheat, improved the miscellaneous rate of removing of ear of wheat, effectively promote the screening effect.

Example two:

referring to fig. 1, 2 and 3, in the first embodiment, in order to enhance the sieving capability and ensure the sieving effect in the process of sieving the large impurities, the second embodiment is completed in the vibrating sieving layer 4.

The vibrating screening layer 4 comprises a rotating shaft linkage unit 41, a conjunction frame 42, a swinging layer 43, elastic cloth 44, a reset spring 45, a vibrating layer 46 and an article discharge opening 47, the middle of the screening shell 2 is provided with the conjunction frame 42, the rotating shaft linkage unit 41 is symmetrically arranged inside the conjunction frame 42, the swinging layer 43 capable of swinging back and forth is arranged between the rotating shaft linkage units 41, the edge of the swinging layer 43 is connected with one end of the reset spring 45, the other end of the reset spring 45 is connected with the lower surface of the vibrating layer 46, the elastic cloth 44 arranged in an annular mode is connected between the swinging layer 43 and the vibrating layer 46, the reset spring 45 is arranged outside the elastic cloth 44 in a surrounding mode, sieve holes are uniformly formed in the surfaces of the vibrating layer 46 and the swinging layer 44, the sieve holes are formed inside the elastic cloth 44, the article discharge opening 47 is formed in the upper end of the screening shell 2, and an opening and closing switch is formed in the article discharge opening 47.

The rotating shaft linkage unit 41 comprises a motor 411, a conveyor belt 412, a driving shaft 413, a driven shaft 414, a driving gear 415, a driven gear 416 and a cam 417, the motor 411 is installed on the inner wall of the fitting frame 42, an output shaft of the motor 411 is fixedly connected with the side wall of the swing layer 42, the output shaft of the motor 411 is connected with the driving shaft 413 through the conveyor belt 412, the driving gear 415 is installed at one end of the driving shaft 413, the driven gear 416 is installed at one end of the driven shaft 415, the driving shaft 413 and the driven shaft 414 are rotatably installed on the inner side wall of the fitting frame 42, the driving gear 415 and the driven gear 416 are meshed with each other, the diameter of the driving gear 415 is larger than that of the driven gear 416, the cam 417 is sleeved on the driven shaft 414, and the cam 417 is in intermittent fit with the vibration layer 46.

In the actual screening process, swing layer 43 is swung in conjunction with the frame 42 reciprocal by a small margin (has simulated the action that personnel swung the screen cloth) under the drive of motor 411, make the ear of wheat on the shale shaker selection layer 4 evenly spill, avoid piling up, reinforcing screening effect, in swing layer 43, through the rotation of motor 411 and the linkage of conveyer belt 412, synchronous pivoted driving gear 415 drives driven gear 416 and carries out the variable speed rotation (low-speed conversion to high speed), high frequency rotation's cam 417 carries out vibration processing from top to bottom to vibration layer 46, thereby carry out vibrating screening filtration to the ear of wheat, after the vibration screening is accomplished, the switch that opens and shuts who offers on the row of things mouth 47 is opened, will stay bigger shell and straw residue on vibration layer 46 and clear away equipment.

Example three:

referring to fig. 6, 7 and 8, on the basis of the first embodiment, in order to push the ear of wheat clamped on the sieving net 542 into the ring barrel 541 again and avoid the blockage of the mesh to affect the normal sieving operation of the sieving net 542, the air-blowing brush 55 is completed in the third embodiment.

The air-blowing brush 55 comprises an air-blowing pump 551, a communicating hose 552, a sliding plate 553, bristles 554, an electric slider 555, a base is symmetrically arranged on the outer wall of the screening shell 2, the air-blowing pump 551 is arranged inside the base, the communicating hose 552 is connected between the air-blowing pump 551 and an air-blowing channel, the air-blowing channel is arranged on the sliding plate 553, bristles 554 are uniformly arranged on the inner surface of the sliding plate 553 from top to bottom, the sliding plate 553 is arranged on the electric slider 555, the electric slider 555 is arranged on the inner wall of the screening shell 2, the sliding plate 553 at the initial position is located below the screening net 542, air holes communicated with the air-blowing channel are uniformly formed in the surface of the sliding plate 553, and the air holes and the bristles 554 are sequentially arranged from top to bottom in a staggered manner.

In the actual screening process, the initial position of the air-blowing brush 55 is located below the screening net 542, when the wheat ears are subjected to diffusion movement after being subjected to high speed of the spiral frame 53, the electric slide block 555 drives the sliding plate 553 to move up and down, at the moment, the brush hairs 554 sweep the screening net 542 (the brush hairs 554 extend into the screening net 542), and meanwhile, the air-blowing pump 551 blows air out from the air holes after the air is input into the air-blowing channel, so that the brush hairs 554 are assisted to sweep the screening net 542, and the condition that the subsequent filtration is influenced by excessive blockage of wheat ear particles and particle impurities in the screening net 542 is avoided.

Example four:

referring to fig. 3, 4 and 5, in the fourth embodiment, in order to further enhance the pushing force of the wheat ears to the sieving net 542, the ventilation shaft 58 is correspondingly arranged.

The surface of the outer wall of the upper end of the ventilation shaft 58 is uniformly provided with ventilation holes, the ventilation holes are communicated with the cavity, and the lower end of the ventilation shaft 58 is of an opening structure.

In the actual screening process, air generated by the bottom air pump 56 enters from the lower end of the ventilation shaft 58 and is discharged from the ventilation hole at high pressure, the scattered air flow assists the wheat ears to be blown to the screening net 542, and the scattering effect of the wheat ears is enhanced by additionally arranging the air flow.

Example five:

referring to fig. 2 and 6, in addition to the first embodiment, in order to separately discharge the ear of wheat and the crushed stones, in the fifth embodiment, a corresponding discharge hole 6 is provided.

The discharge port 6 comprises a seed outlet 61, an impurity outlet 62 and a separating ring 63, the separating ring 63 is fixedly arranged on the lower surface of the chassis 51, the seed outlet 61 is arranged inside the separating ring 63, and the separating ring 63 and the screening shell 2 form the impurity outlet 62.

In the actual screening process, the crushed wheat grains are discharged from the impurity outlet 62, and the screened wheat ear grains are discharged from the grain outlet 61.

The implementation principle of the embodiment is as follows:

step one, placing mature wheat ears into a feeding port, and enabling the wheat ears to fall on a vibration screening layer through the feeding port.

And step two, mechanically vibrating and screening the wheat ears through the vibration screening layer, so as to filter out large-particle impurities, straw scraps, wheat ear grains and mixed small-particle impurities, and enabling the large-particle impurities, the straw scraps, the wheat ear grains and the mixed small-particle impurities to enter the rotary separation layer after vibration screening.

Step three, the wheat ears are pushed to be scattered and opened by the aid of air blowing at the upper end of the ventilation shaft and through rotation of the spiral frame, the wheat ears are contacted with the screening net and are screened, small-particle impurities can be screened out through the screening net and discharged from the discharge port, the wheat ear grains are blocked in the ring barrel through the screening net, then the wheat ears falling into the ring barrel are conveyed to the top through the rotary spiral frame in a spiral lifting mode, the wheat ears are scattered again, reciprocating centrifugal screening work is conducted, and in the circulating screening process, the wheat ears clamped on the screening net are pushed into the ring barrel again through the air blowing hairbrush moving up and down.

And step four, after repeated circulating screening, the electric turntable stops operating, the opening plate is opened under the driving of the air cylinder, and full wheat ear grains fall into the discharge hole through the arc-shaped channel to complete the screening work of the wheat ear grains.

While certain exemplary embodiments of the present invention have been described above by way of illustration only, it will be apparent to those of ordinary skill in the art that the described embodiments may be modified in various different ways without departing from the spirit and scope of the invention. Accordingly, the drawings and description are illustrative in nature and should not be construed as limiting the scope of the invention.

Claims

1. The utility model provides a wheat seed grain screening plant, includes frame (1), its characterized in that: a screening shell (2) is fixedly installed inside the rack (1), a feeding port (3) is formed in the top of the screening shell (2), and a vibrating screening layer (4), a rotary separating layer (5) and a discharging port (6) are sequentially arranged inside the screening shell (2) from top to bottom;

the rotary separation layer (5) comprises a chassis (51), an electric rotating disc (52), a spiral frame (53), a screening cylinder (54), an air blowing brush (55), a bottom air pump (56), a fixed cylinder (57) and a ventilation shaft (58), wherein the chassis (51) is arranged inside the screening shell (2), the electric rotating disc (52) with an annular structure is arranged on the chassis (51), the ventilation shaft (58) with a cavity structure is arranged in the middle of the electric rotating disc (52), the spiral frame (53) is sleeved outside the ventilation shaft (58), the outer edge of the spiral frame (53) is tightly attached to the inner wall of the fixed cylinder (57), the lower end of the fixed cylinder (57) is fixedly arranged on the chassis, through grooves are uniformly formed in the lower end of the fixed cylinder (57), the screening cylinder (54) positioned outside the fixed cylinder (57) is fixedly arranged on the chassis, a groove track is formed in the inner side wall of the screening shell (2), the air blowing brush (55) is slidably arranged on the groove track through an electric sliding blocks, a cross beam with a hollowed-out structure is arranged at the lower end of the screening shell (2), the bottom of the cross beam is provided with a bottom portion of the bottom, the air pump (56), and an air outlet of the air pump (58) is matched with the air tightness of the ventilation shaft.

2. The wheat grain screening device of claim 1, wherein: the vibrating screening layer (4) comprises a rotating shaft linkage unit (41), a conjunction frame (42), a swinging layer (43), elastic cloth (44), a reset spring (45), a vibrating layer (46) and an article discharge opening (47), the middle of the screening shell (2) is provided with the conjunction frame (42), the rotating shaft linkage unit (41) is symmetrically arranged inside the conjunction frame (42), the swinging layer (43) capable of swinging back and forth is arranged between the rotating shaft linkage unit (41), the edge of the swinging layer (43) is connected with one end of the reset spring (45), the other end of the reset spring (45) is connected with the lower surface of the vibrating layer (46), the elastic cloth (44) arranged in an annular mode is connected between the swinging layer (43) and the vibrating layer (46), the reset spring (45) is arranged outside the elastic cloth (44) in a surrounding mode, sieve holes are uniformly formed in the surfaces of the vibrating layer (46) and the swinging layer (44), sieve holes are formed in the elastic cloth (44), the upper end of the screening shell (2) is provided with the article discharge opening (47), and an opening switch is formed in the article discharge opening (47).

3. The wheat grain screening device of claim 2, wherein: the utility model discloses a vibration layer's vibration is including pivot linkage unit (41) including motor (411), conveyer belt (412), driving shaft (413), driven shaft (414), driving gear (415), driven gear (416) and cam (417), install motor (411) on agreeing with frame (42) inner wall, the output shaft and the swing layer (42) lateral wall fixed connection of motor (411), the output shaft and the driving shaft (413) of motor (411) are connected through conveyer belt (412), driving gear (415) are installed to the one end of driving shaft (413), driven gear (416) are installed to the one end of driven shaft (415), driving shaft (413), driven shaft (414) rotate to be installed on agreeing with the inside wall of frame (42), driving gear (415) and driven gear (416) intermeshing, driving gear (415) diameter is greater than driven gear (416) diameter, cam (417) cover is established on driven shaft (414), intermittent type cooperation between cam (417) and vibration layer (46).

4. The wheat grain screening device of claim 1, wherein: chassis (51) are including holding in the palm (511), open-close plate (512) and cylinder (513) material greatly, and the inner wall of screening shell (2) is installed and is held in the palm (511) material greatly, and material greatly evenly is provided with the arc passageway on holding in the palm (511), and the arc passageway is connected with open-close plate (512) through the hinge, installs cylinder (513) through the round pin axle on bottom air pump (56), and the top of open-close plate (512) and cylinder (513) is through the round pin hub connection.

5. The wheat grain screening device of claim 1, wherein: screening section of thick bamboo (54) including a ring section of thick bamboo (541) and screening net (542), a ring section of thick bamboo (541) fixed mounting is on chassis (51), screening net (542) are evenly installed to a ring section of thick bamboo (541) upper end.

6. The wheat grain screening device of claim 5, wherein: air-blowing brush (55) include air-blowing pump (551), intercommunication hose (552), sliding plate (553), brush hair (554), electronic slider (555), screening shell (2) outer wall symmetry is provided with the base, inside air-blowing pump (551) that is provided with of base, be connected with intercommunication hose (552) between air-blowing pump (551) and the air-blowing passageway, the air-blowing passageway is seted up on sliding plate (553), brush hair (554) are evenly installed from last down to the internal surface of sliding plate (553), sliding plate (553) set up on electronic slider (555), the inner wall at screening shell (2) is installed in electronic slider (555), and sliding plate (553) of initial position is located the below of screening net (542), sliding plate (553) surface evenly seted up with air-blowing passageway intercommunication gas pocket, and down in proper order staggered arrangement between gas pocket brush hair (554).

7. The wheat grain screening device of claim 1, wherein: the surface of the outer wall of the upper end of the ventilation shaft (58) is uniformly provided with ventilation holes, the ventilation holes are communicated with the cavity, and the lower end of the ventilation shaft (58) is of an opening structure.

8. The wheat grain screening device of claim 1, wherein: the discharge port (6) comprises a seed outlet (61), an impurity outlet (62) and a separating ring (63), the separating ring (63) is fixedly arranged on the lower surface of the chassis (51), the seed outlet (61) is arranged inside the separating ring (63), and the separating ring (63) and the screening shell (2) form the impurity outlet (62).