CN114632690B

CN114632690B - Seed sieving mechanism

Info

Publication number: CN114632690B
Application number: CN202210286487.9A
Authority: CN
Inventors: 章诗陆
Original assignee: Fujian Anchor Agricultural Technology Co ltd
Current assignee: Fujian Anchor Agricultural Technology Co ltd
Priority date: 2022-03-23
Filing date: 2022-03-23
Publication date: 2022-12-13
Anticipated expiration: 2042-03-23
Also published as: CN114632690A

Abstract

The application discloses a seed sieving mechanism, relate to screening installation's technical field, it includes the screening barrel, be formed with the screening chamber in the screening barrel, the coaxial rotation of screening barrel has the axis of rotation, axis of rotation periphery side cover is equipped with a plurality of support rings, the screening barrel is provided with a plurality ofly and with the drive ring of support ring one-to-one, the screening barrel is provided with the reciprocal drive assembly that slides from top to bottom of drive ring when rotatory of rotation axis, be provided with a plurality of go-between and drive ring between support ring and the drive ring, the screening barrel is provided with and is used for connecting the support ring, the coupling assembling of go-between and drive ring, the screening barrel is provided with and is used for making the drive ring, the link, a plurality of screening holes along the even interval distribution of circumference are seted up respectively to drive ring and support ring, the screening barrel is provided with the inlet pipe, the screening barrel bottom is provided with the row who is used for discharging screening chamber bottom screen material pipe, this application can reduce human resource's consume.

Description

Seed sieving mechanism

Technical Field

The application relates to the technical field of screening equipment, in particular to a seed screening device.

Background

Seed screening usually is to screen the seeds to be planted before planting, and select large, full and tidy seeds, so as to increase the number of crops which can be harvested after planting.

At present, the screening of the particle size of the seeds is generally carried out by a screen, a plurality of screens are required for the screening, and the mesh diameter of each screen is different. During screening, the seeds are screened through the screen with the large mesh diameter to leave the largest particles, then the screened and left seeds are further screened through the screen with the small mesh diameter, and the seeds are sorted according to the particle size according to the steps.

In the process of implementing the application, the inventor finds that at least the following problems exist in the technology: the screening process of the seeds is complicated, and large human resources need to be consumed.

Disclosure of Invention

In order to reduce the consumption of human resources, the application provides a seed sieving mechanism.

The application provides a seed sieving mechanism adopts following technical scheme:

the utility model provides a seed sieving mechanism, includes the screening section of thick bamboo, be formed with the screening chamber in the screening section of thick bamboo, the coaxial rotation of screening section of thick bamboo has the rotation axis that is located the screening chamber, screening bobbin top is provided with the rotatory power spare of drive rotation axis, rotation axis periphery side is equipped with a plurality of support rings along vertical direction spacer sleeve, the screening section of thick bamboo be provided with a plurality ofly and with the drive ring of support ring one-to-one, the reciprocal gliding drive assembly from top to bottom of drive ring when being provided with the rotation axis rotation, be provided with a plurality of go-between support ring and the drive ring, support ring, go-between and drive ring coaxial setting, the go-between ring respectively with support ring, drive ring about sliding contact, adjacent slide contact between the go-between ring, the screening section of thick bamboo is provided with the coupling assembling that is used for connecting support ring, go-between ring and drive ring linkage, go-between ring and support ring, go-between ring and drive ring have offered a plurality ofly along circumference even interval distribution's screening hole respectively, the drive ring becomes downwardly extending from drive ring when the drive ring is located corresponding support ring top of support ring and the downstream, the discharge port is provided with the rotation axis bottom and the rotation axis is provided with the rotation axis and the discharge hole that the discharge port is provided with the adjacent discharge tube bottom of screening bobbin and the discharge tube and is provided with the adjacent discharge ring and the discharge hole, the rotary shaft is provided with a discharge pipe which is connected with the discharge port and protrudes downwards to the outside of the rotary hole, and the bottom of the screening drum is provided with a plurality of collecting boxes which are respectively used for collecting discharge materials of different discharge pipes.

Through adopting above-mentioned technical scheme, the seed is followed the inlet pipe input and is screened the intracavity during screening, starting motor drives the rotation axis rotation after that, make the support ring, go-between and drive ring follow the rotation axis rotation, thereby the drive ring is driven the up-and-down motion by drive assembly when rotatory, make the drive ring, go-between and support ring support form the slope upwards or the decurrent stair structure of slope, make the seed of treating the screening slide, increase the screening frequency of screening pore pair seed, promote the degree of accuracy that the seed was screened, and the screening process need not too much manpower, be favorable to reducing manpower resources's loss.

Optionally, the coupling assembling includes upper prop and lower prop, the position that go away from the rotation axis and go from the go-between, support ring top and bottom both sides is provided with a plurality of support columns along circumference respectively, the upper prop sets up in the support column that is located the top and extends towards keeping away from the support column direction, the lower prop sets up in the support column of below and extends towards keeping away from the rotation axis direction, the go-between is from being close to when the downward echelonment of drive ring one side to support ring direction distributes the upper prop respectively the butt in adjacent go-between, the drive ring top of keeping away from the rotation axis, the go-between is from being close to when the upward echelonment of drive ring one side to support ring direction distributes the lower prop respectively the butt in adjacent go-between, the drive ring bottom of keeping away from the rotation axis.

Through adopting above-mentioned technical scheme, through last post butt drive ring, go up the go-between top during the use, through lower post butt drive ring, go-between bottom, reduce the possibility that breaks away from each other between drive ring, go-between and the support ring.

Optionally, the linkage piece is the linkage board, the linkage board sets up in drive ring and go-between bottom, the linkage board have the multiunit and with lower post one-to-one, every group the linkage board symmetry is provided with two, the linkage board downwardly extending, the lower post slides from top to bottom between the linkage board of the same group, lower post and the sliding contact of the linkage board of the same group.

By adopting the technical scheme, the connecting ring and the driving ring can move along with the supporting ring by the abutting of the lower column on the linkage plate during use.

Optionally, the position that the rotation axis was kept away from at the go-between top is coaxial to be provided with first collar, first collar slides from top to bottom in the support column, the go-between top is close to the coaxial second collar that is provided with in position of rotation axis, the go-between is provided with the gliding guide post from top to bottom that supplies the second collar, be provided with between first collar and the second collar and connect cloth, connect cloth and offer the blanking mouth with the screening hole one-to-one, connect the cloth bottom be provided with the blanking mouth one-to-one and slide from top to bottom with the hose in screening hole, the screening section of thick bamboo is provided with the drive ring and drives the second collar when moving to the support ring below and upwards or drive the first collar upward movement's of drive ring control assembly when moving to the support ring top, the gliding shifting chute about supplying the upper prop is seted up to the second collar.

By adopting the technical scheme, the inclined plane is formed by matching the connecting cloth with the connecting ring, the driving ring and the supporting ring during use, so that the seeds can slide conveniently.

Optionally, the control assembly is a first power block and a second power block, the first power block is respectively arranged on the inner peripheral side of the connecting ring and the driving ring, a first power groove which penetrates downwards and supplies the first power block to slide up and down is formed in the outer peripheral side of the first mounting ring, first sliding grooves which correspond to the first power groove one to one and supply the first power block to slide up and down are formed in the outer peripheral side of the supporting ring and the outer peripheral side of the connecting ring, the second power block is respectively arranged on the outer peripheral side of the connecting ring and the outer peripheral side of the supporting ring, a second power groove which penetrates downwards and supplies the second power block to slide up and down is formed in the inner peripheral side of the second mounting ring, and second sliding grooves which correspond to the second power groove one to one and supply the second power block to slide up and down are formed in the inner peripheral side of the connecting ring and the driving ring.

By adopting the technical scheme, the first mounting ring is driven to move upwards by the first power block during use, and the second mounting ring is driven to move upwards by the second power block, so that the first mounting ring and the second mounting ring can be matched with the connecting ring, the driving ring and the supporting ring to form an inclined plane when the driving ring moves up and down.

Optionally, the driving assembly includes a plurality of driving balls, the driving balls are rotatably connected to the outer peripheral side of the driving ring at uniform intervals along the circumference, a plurality of driving grooves corresponding to the driving ring one by one are formed in the inner wall of the screening chamber along the circumferential side, the driving balls slide in the driving grooves, and the driving grooves extend in a corrugated track.

By adopting the technical scheme, the driving ball slides in the driving groove when in use, so that the driving ring can move up and down.

Optionally, the power part is a motor, and the motor is arranged at the top of the screening drum and connected with the rotating shaft.

Through adopting above-mentioned technical scheme, the motor starts to drive the rotation axis rotation during the use.

Optionally, a plurality of sliding columns perpendicular to the rotating shaft are arranged on the wall of the screening cavity in a vertically sliding manner, the sliding columns correspond to the supporting rings one by one and are respectively located right above the supporting rings, the screening cylinder is provided with a first push plate perpendicular to the rotating shaft and sliding on the top of the supporting rings, the screening cylinder is provided with a second push plate perpendicular to the rotating shaft and sliding on the top of the driving rings, the first push plate and the second push plate are located at the same horizontal height, and the sliding columns are provided with fixing columns respectively used for connecting the first push plate and the second push plate.

Through adopting above-mentioned technical scheme, when the rotation axis was rotatory, first push pedal promoted the seed motion at support ring top, and the seed motion at drive ring top is promoted to the second push pedal, reduces the accumulational possibility of seed.

In summary, the present application includes at least one of the following benefits:

1. seeds enter the screening cavity from the feeding pipe, the motor is started to drive the rotating shaft to rotate, and inclined planes which incline upwards or downwards are formed among the driving ring, the connecting ring and the supporting ring, so that the seeds can slide, the frequency of screening the seeds by the screening holes is improved, too much manpower is not needed, and the manpower resource loss is favorably reduced;

2. when the seed pushing device is used, the seeds on the supporting ring are pushed through the first pushing plate, the seeds on the driving ring are pushed through the second pushing plate, and the possibility of seed accumulation is reduced.

Drawings

FIG. 1 is a schematic diagram of the overall structure of an embodiment of the present application;

FIG. 2 is a schematic view of the interior of a screen cylinder according to an embodiment of the present application;

FIG. 3 is a schematic view of an internal cross-section of an embodiment of the present application;

FIG. 4 is a schematic view of the embodiment of the present application showing the state when the driving ring moves above the supporting ring;

FIG. 5 is an enlarged schematic view of section A of FIG. 3;

fig. 6 is a schematic view showing the state when the driving ring moves below the supporting ring according to the embodiment of the present application.

Reference numerals: 1. a screen cylinder; 11. a feed pipe; 12. a collection box; 13. a motor; 14. a traveler; 15. a first push plate; 16. a second push plate; 17. fixing a column; 18. a discharge pipe; 19. a collection barrel; 2. a screening chamber; 21. a drive slot; 3. a rotating shaft; 31. rotating the hole; 32. a discharge port; 33. a discharge pipe; 4. a support ring; 5. a drive ring; 6. a connecting ring; 61. a screening well; 62. a first mounting ring; 621. a first power tank; 622. a first chute; 63. a second mounting ring; 631. a guide post; 632. a moving groove; 633. a second power tank; 634. a second chute; 64. connecting cloth; 641. a blanking port; 65. a hose; 7. a drive ball; 8. a connecting assembly; 81. putting the column on; 82. column descending; 83. a support pillar; 84. a linkage plate; 9. a first power block; 91. and a second power block.

Detailed Description

The present application is described in further detail below with reference to figures 1-6.

The embodiment of the application discloses a seed screening device. Referring to fig. 1 and 2, the seed screening device includes a screening cylinder 1, a support frame composed of a plurality of vertical columns is fixedly connected to the bottom of the screening cylinder 1, and a screening cavity 2 is formed in the screening cylinder 1. The position fixedly connected with inlet pipe 11 that 1 week side wall of screen cylinder just is close to the top, and inlet pipe 11 is linked together with screening chamber 2, and the seed of treating the screening passes through inlet pipe 11 and gets into in the screening chamber 2.

Referring to fig. 2, the screening drum 1 is rotatably connected with a rotating shaft 3, and the rotating shaft 3 is located in the screening chamber 2 and is coaxial with the screening drum 1. Screening cylinder 1 is provided with the power spare, and the power spare is motor 13, and motor 13 is fixed at screening cylinder 1 top through the support from the area, and fixed connection between motor 13's output shaft and the rotation axis 3 starts motor 13 during the use, drives rotation axis 3 and rotates.

Referring to fig. 2 and 3, a plurality of support rings 4 are fixed to the outer circumferential side of the rotating shaft 3, and the support rings 4 are uniformly spaced in the vertical direction. The peripheral side cavity wall of screening chamber 2 slides from top to bottom and is provided with drive ring 5, and the peripheral side of drive ring 5 and the chamber wall sliding contact of screening chamber 2, drive ring 5 have a plurality ofly and with support ring 4 one-to-one. A plurality of connecting rings 6 are uniformly arranged between the supporting ring 4 and the corresponding driving ring 5, and the connecting rings 6, the supporting ring 4 and the driving ring 5 are coaxially arranged. The outer periphery of the support ring 4 is in up-and-down sliding contact with the outer periphery of the adjacent connecting ring 6, the inner periphery of the drive ring 5 is in up-and-down sliding contact with the outer periphery of the adjacent connecting ring 6, and the inner periphery and the outer periphery of the adjacent connecting rings 6 are in up-and-down sliding contact. The connecting ring 6, the support ring 4 and the drive ring 5 are respectively provided with a plurality of screening holes 61 at intervals along the circumferential direction, and the screening holes 61 are used for seeds with diameters smaller than the diameters of the screening holes 61 to continuously drop downwards, and the diameters of the screening holes 61 positioned right above are larger than the diameters of the screening holes 61 positioned right below.

Referring to fig. 3 and 4, the screen cylinder 1 is provided with a connecting assembly 8, the connecting assembly 8 comprising an upper column 81 and a lower column 82. The top of support ring 4 and go up ring 6, bottom both sides and keep away from the position of rotation axis 3 respectively fixedly connected with support column 83, support column 83 have a plurality ofly and set up along the even interval of circumference. The upper column 81 is fixed to the top of the support column 83 located above and extends in a direction away from the rotary shaft 3, and the lower column 82 is fixed to the bottom of the support column 83 located below and extends in a direction away from the rotary shaft 3, and the drive ring 5, the connection ring 6, and the support ring 4 are restricted and supported by the upper column 81 and the lower column 82 during use.

Referring to fig. 3 and 4, the screening cylinder 1 is provided with linkage members, the linkage members are linkage plates 84, the linkage plates 84 are fixed at the bottoms of the driving ring 5 and the connecting ring 6, there are multiple groups of linkage plates 84 and one-to-one corresponding to the lower columns 82, and two linkage plates 84 in each group extend downwards. The lower post 82 slides up and down between the same set of two linkage plates 84 and is in contact with the linkage plates 84. When the rotating shaft 3 rotates, the support ring 4, the connecting ring 6 and the drive ring 5 are in linkage by the lower column 82 abutting against the linkage plate 84, so that the connecting ring 6 and the drive ring 5 rotate along with the support ring 4.

Referring to fig. 3 and 4, the screen cylinder 1 is provided with a drive assembly which drives the drive ring 5 up and down when the drive ring 5 is rotated. The driving assembly comprises a plurality of driving balls 7, the driving balls 7 are rotatably connected to the outer peripheral side of the driving ring 5, and the plurality of driving balls 7 are uniformly arranged at intervals along the circumferential direction. The side cavity wall of the screening cavity 2 periphery is provided with driving grooves 21 corresponding to the driving rings 5 one by one, the driving grooves 21 extend along the circumferential direction and form a corrugated track, when in use, the driving balls 7 slide in the driving grooves 21, and the tracks of all the driving balls 7 passing through the driving grooves 21 at the same time are the same. When the drive ring 5 rotates, the drive balls 7 slide in the drive grooves 21 and the drive balls 7 slide on the groove walls of the drive grooves 21 so that the drive ring 5 follows the corrugated track of the drive grooves 21 to move up and down. When the driving ball 7 moves to the peak position of the corrugated track of the driving groove 21, the driving ring 5 is located above the supporting ring 4 and the upper column 81 abuts against the top of the corresponding driving ring 5 and the connecting ring 6 respectively, at this time, the connecting ring 6 forms a downward step-extending structure from the driving ring 5 to the supporting ring 4; when the driving ball 7 moves to the valley position of the corrugated track of the driving groove 21, the driving ring 5 is located below the supporting ring 4 and the lower column 82 abuts against the bottom of the corresponding driving ring 5 and the connecting ring 6 respectively, and the connecting ring 6 forms an upward stepped extension structure from the driving ring 5 to the supporting ring 4.

Referring to fig. 1 and 3, a discharging pipe 18 is fixedly connected to the bottom of the screening drum 1 for discharging inferior seeds dropped from the bottom of the screening drum 1, and a collecting barrel 19 is placed at the bottom of the screening drum 1 for collecting inferior seeds discharged from the discharging pipe 18. A rotating hole 31 penetrating downwards to the outside of the screening cylinder 1 is formed in the rotating shaft 3, a discharge hole 32 which is adjacent to the top of the support ring 4 and communicated with the rotating hole 31 is formed in the outer peripheral side of the rotating shaft 3, one end of the rotating shaft 3 is connected to the discharge hole 32, and the other end of the rotating shaft extends downwards to a discharge pipe 33 outside the screening cylinder 1. The bottom joint of a screening section of thick bamboo 1 is fixed with collection box 12, collects box 12 have a plurality ofly and with discharging pipe 33 one-to-one for collect from discharging pipe 33 discharge and through the seed of screening.

Referring to fig. 3 and 4, a first mounting ring 62 is coaxially disposed at a position away from the rotating shaft 3 at the top of the connecting ring 6, a mounting hole is formed in the first mounting post, and the supporting post 83 penetrates through the mounting hole, so that the first mounting ring 62 slides up and down on the supporting post 83. A plurality of guide posts 631 are fixed at circumferential intervals at the top of the connection ring 6 and near the rotating shaft 3, a second mounting ring 63 is coaxially disposed at the top of the connection ring 6 near the rotating shaft 3, and a guide hole for the guide posts 631 to pass through is formed in the second mounting ring 63, so that the second mounting ring 63 slides up and down on the guide posts 631. A moving groove 632 is formed on the inner peripheral side of the second mounting ring 63, and the upper column 81 slides up and down in the moving groove 632, thereby reducing the possibility that the second mounting ring 63 will block the upper column 81.

Referring to fig. 4 and 5, a connecting cloth 64 is fixedly connected between the first mounting ring 62 and the second mounting ring 63 on the top of the connecting ring 6, and a plurality of blanking ports 641 corresponding to the screening holes 61 one to one are formed in the connecting cloth 64. The bottom of the connecting cloth 64 is fixedly provided with a hose 65 made of plastic materials with certain elasticity through bonding, the inner diameter of the hose 65 is equal to the diameter of the screening hole 61 of the driving ring 5, the hose 65 slides up and down in the screening hole 61, and seeds with the particle size meeting the requirements fall into the hose 65 through the blanking port 641 and then fall downwards through the hose 65. The size of the screening hole 61 of the connection ring 6 is appropriately enlarged when the hose 65 is mounted so that the hose 65 can slide in the screening hole 61 of the connection ring 6.

Referring to fig. 3 and 4, the sieving cylinder 1 is provided with a control assembly, when the driving ball 7 moves to the peak position of the ripple track of the driving groove 21, the control assembly controls the first mounting ring 62 to move upward so that the connecting cloth 64 inclines downward toward the rotating shaft 3, and when the driving ball 7 moves to the valley position of the ripple track of the driving groove 21, the control assembly controls the second mounting ring 63 to move upward so that the connecting cloth 64 inclines downward toward the driving ring 5, thereby facilitating the sliding of the seeds;

referring to fig. 3 and 5, the control assembly includes a plurality of first power blocks 9 and a plurality of second power blocks 91, and the plurality of first power blocks 9 are fixed to the inner circumferential sides of the connecting ring 6 and the driving ring 5 at regular intervals along the circumferential direction. The outer periphery of the first mounting ring 62 is provided with a first power groove 621 penetrating downward to the outside of the first mounting ring 62, the outer peripheries of the support ring 4 and the connection ring 6 are respectively provided with a first sliding groove 622 communicating with the first power groove 621 along the vertical direction, and the first power block 9 slides up and down in the first sliding groove 622 and the first power groove 621. When the driving ring 5 is located above the supporting ring 4 and moves to the peak position of the ripple track of the driving groove 21, the first power block 9 slides upwards in the first sliding groove 622 and then slides into the first power groove 621 until abutting against the top groove wall of the first power groove 621 and then drives the first mounting ring 62 to move upwards.

Referring to fig. 5 and 6, the second power blocks 91 are plural and are fixed to the outer peripheral sides of the connecting ring 6 and the support ring 4 at uniform intervals in the circumferential direction. A second power groove 633 penetrating downwards to the outside of the second mounting ring 63 is formed in the inner peripheral side of the second mounting ring 63, a first sliding groove 622 communicated with the first power groove 621 is formed in the outer peripheral sides of the driving ring 5 and the connecting ring 6 respectively in the vertical direction, and the first power block 9 slides up and down in the first sliding groove 622 and the first power groove 621. When the driving ring 5 is located below the supporting ring 4 and moves to the trough position of the corrugated track of the driving groove 21, the second power block 91 slides upwards in the second sliding groove 634 and then slides into the second power groove 633 until abutting against the top groove wall of the second power groove 633, and then drives the second mounting ring 63 to move upwards.

Referring to fig. 3, the screen cylinder 1 is provided with a plurality of sliding columns 14 corresponding to the support rings 4 one by one, and the sliding columns 14 are positioned right above the support rings 4 and perpendicular to the rotating shaft 3. The side chamber wall of screening chamber 2 has seted up the spread groove along vertical direction all around, and the both ends of traveller 14 slide in the spread groove respectively from top to bottom. The top sliding connection of support ring 4 has first push pedal 15, first push pedal 15 layer rectangular plate shape and length direction are mutually perpendicular with rotation axis 3, be provided with the second push pedal 16 of rectangular plate structure directly over the drive ring 5, the length direction of second push pedal 16 is mutually perpendicular with the length direction of first push pedal 15, and first push pedal 15 is in same level with second push pedal 16, two fixed columns 17 of fixedly connected with respectively in traveller 14 bottom, two fixed columns 17 keep away from traveller 14 one end and are fixed mutually with first push pedal 15, second push pedal 16 top respectively. When the driving ring 5 is located below the supporting ring 4, the first pushing plate 15 abuts against the top of the supporting ring 4, and at this time, the second pushing plate 16 is far away from the driving ring 5, and when the rotating shaft 3 rotates, the first pushing plate 15 pushes the seeds at the top of the supporting ring 4 to move, so that the possibility of seed accumulation is reduced. When the driving ring 5 is positioned above the supporting ring 4, the second push plate 16 abuts against the top of the driving ring 5, at this time, the first push plate 15 is far away from the supporting ring 4, and when the rotating shaft 3 rotates, the second push plate 16 pushes the seeds at the top of the driving ring 5, so that the possibility of seed accumulation is reduced.

The seed screening device of the embodiment of the application has the following implementation principle:

during screening, seeds enter the screening cavity 2 from the feeding pipe 11, and then fall on the tops of the driving ring 5 and the connecting ring 6, and then the rotating shaft 3 is driven to rotate by the starting motor 13, so that the connecting ring 6 and the driving ring 5 rotate along with the supporting ring 4. When the driving ring 5 rotates, the driving ball 7 slides in the driving groove 21, the driving ring 5 moves up and down, so that the connecting ring 6 and the connecting cloth 64 are matched to form an inclined surface and supply seeds to slide, when the seeds slide, the particle size meets the requirement of an inlet hose 65 of the discharge port 32 and drops downwards to realize screening, and the seeds with the particle size larger than that of the discharge port 32 are left on the connecting ring 6 and slide to the top of the supporting ring 4 to be discharged through the discharge pipe 18.

The above are preferred embodiments of the present application, and the scope of protection of the present application is not limited thereto, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. A seed sieving mechanism which characterized in that: including a screening barrel (1), be formed with screening chamber (2) in the screening barrel (1), screening barrel (1) coaxial rotation has rotation axis (3) that is located screening chamber (2), screening barrel (1) top is provided with the rotatory power spare of drive rotation axis (3), rotation axis (3) periphery side is equipped with a plurality of support rings (4) along vertical direction interval cover, screening barrel (1) is provided with a plurality ofly and with support ring (4) one-to-one drive ring (5), screening barrel (1) is provided with drive ring (5) reciprocal gliding drive assembly from top to bottom when rotation axis (3) is rotatory, be provided with a plurality of go-between (6) between support ring (4) and the drive ring (5), support ring (4), go-between (6) and drive ring (5) coaxial setting, go-between (6) respectively with support ring (4), drive ring (5) up-down sliding contact, adjacent sliding contact from top to bottom between (6), screening barrel (1) is provided with link coupling assembling (8) that are used for connecting support ring (4), drive ring (6) and (5), drive ring (5), screening barrel (1) is provided with the link assembling spare that is used for making support ring (4), drive ring (6) and drive ring (5), the connecting ring (6), the driving ring (5) and the supporting ring (4) are respectively provided with a plurality of screening holes (61) which are uniformly distributed at intervals along the circumferential direction, the driving ring (5) is positioned above the corresponding supporting ring (4) and when moving downwards, the connecting ring (6) extends downwards in a step shape from the driving ring (5) to the supporting ring (4), the driving ring (5) is positioned below the corresponding supporting ring (4) and the connecting ring (6) extends upwards in a step shape from the driving ring (5) to the supporting ring (4) when moving upwards, a feeding pipe (11) for introducing the objects to be screened is communicated with the side wall of the peripheral side of the screening cylinder (1) and is close to the top, a discharge pipe (18) for discharging screened materials at the bottom of the screening cavity (2) is arranged at the bottom of the screening cylinder (1), a rotating hole (31) which penetrates downwards to the outside of the screening cylinder (1) is formed in the rotating shaft (3), a discharge hole (32) communicated with the rotary hole (31) and close to the top of the support ring (4) is arranged on the peripheral side of the rotary shaft (3), the rotating shaft (3) is provided with a discharge pipe (33) which is connected with the discharge hole (32) and protrudes downwards to the outside of the rotating hole (31), the bottom of the screening cylinder (1) is provided with a plurality of collecting boxes (12) which are respectively used for collecting the discharge of different discharge pipes (33).

2. A seed screening apparatus according to claim 1, wherein: coupling assembling (8) are including last post (81) and lower post (82), go up the position that go up post (6), support ring (4) top and bottom both sides and keep away from rotation axis (3) and be provided with a plurality of support columns (83) along circumference respectively, go up post (81) set up in support column (83) that are located the top and extend towards keeping away from support column (83) direction, lower post (82) set up in support column (83) of below and extend towards keeping away from rotation axis (3) direction, when connecting ring (6) from being close to drive ring (5) one side and becoming the echelonment distribution downwards to support ring (4) direction last post (81) respectively butt in adjacent connecting ring (6), the drive ring (5) top of keeping away from rotation axis (3), when connecting ring (6) upwards become the echelonment distribution from being close to drive ring (5) one side to support ring (4) direction lower post (82) butt respectively in adjacent connecting ring (6), the drive ring (5) bottom of keeping away from rotation axis (3).

3. A seed screening apparatus according to claim 2, wherein: the linkage piece is linkage board (84), linkage board (84) set up in drive ring (5) and go-between (6) bottom, linkage board (84) have the multiunit and with lower post (82) one-to-one, every group linkage board (84) symmetry is provided with two, linkage board (84) downwardly extending, lower post (82) slide from top to bottom between with group linkage board (84), lower post (82) and with group linkage board (84) sliding contact.

4. A seed screening apparatus according to claim 2, wherein: the utility model discloses a screening device, including pivot (3), go up support ring (83), be provided with the pivot (3) and connect cloth (64), the pivot is provided with first collar (62) in the pivot, the coaxial first collar (62) that is provided with in the position that rotation axis (3) were kept away from at go-between (6) top, go-between (6) top is close to the position coaxial second collar (63) that is provided with of rotation axis (3), go-between (6) are provided with confession second collar (63) gliding guide post (631) from top to bottom, be provided with between first collar (62) and second collar (63) and connect cloth (64), connect cloth (64) bottom set up with screening hole (61) one-to-one blanking mouth (641) and slide from top to bottom in the hose (65) of screening hole (61), screening section of thick bamboo (1) is provided with when driving ring (5) moves to support ring (4) below drive second collar (63) and upwards or drive first collar (62) upward movement when driving ring (5) moves to support ring (4) top the control assembly of drive first collar (63) upward movement, set up second collar (81) and supply the upper and lower sliding groove (632) to move.

5. A seed screening apparatus according to claim 4, wherein: the control assembly is first power piece (9) and second power piece (91), first power piece (9) set up respectively in the interior periphery side of go-between (6), drive ring (5), first power groove (621) gliding about running through and supplying first power piece (9) is seted up to first collar (62) periphery side, support ring (4) and go-between (6) periphery side set up with first power groove (621) one-to-one and supply first power piece (9) gliding first spout (622) from top to bottom, second power piece (91) set up respectively in go-between (6), support ring (4) periphery side, second collar (63) interior periphery side is seted up and is run through downwards and supply gliding second power piece (91) second power groove (633) from top to bottom, interior periphery of go-between (6), drive ring (5) is equipped with second power groove (633) one-to-one and supply second power piece (91) gliding second spout (634) from top to bottom.

6. A seed screening apparatus according to claim 1, wherein: the driving assembly comprises a plurality of driving balls (7), the driving balls (7) are rotationally connected to the outer peripheral side of the driving ring (5) at equal intervals along the circumference, a plurality of driving grooves (21) which correspond to the driving ring (5) one by one are formed in the inner wall of the screening cavity (2) along the outer peripheral side, the driving balls (7) slide in the driving grooves (21), and the driving grooves (21) extend in a corrugated track mode.

7. A seed screening apparatus according to claim 1, wherein: the power part is a motor (13), and the motor (13) is arranged at the top of the screening cylinder (1) and is connected with the rotating shaft (3).

8. A seed screening apparatus according to claim 1, wherein: the screening device is characterized in that a plurality of sliding columns (14) perpendicular to the rotating shaft (3) are arranged on the wall of the screening cavity (2) in a vertically sliding mode, the sliding columns (14) correspond to the supporting rings (4) in a one-to-one mode and are located right above the supporting rings (4) respectively, a first push plate (15) perpendicular to the rotating shaft (3) and sliding on the top of the supporting rings (4) is arranged on the screening cylinder (1), a second push plate (16) perpendicular to the rotating shaft (3) and sliding on the top of the driving rings (5) is arranged on the screening cylinder (1), the first push plate (15) and the second push plate (16) are located at the same horizontal height, and fixing columns (17) used for connecting the first push plate (15) and the second push plate (16) respectively are arranged on the sliding columns (14).