Seed sorting device

Abstract

The invention relates to the technical field of seed screening, in particular to a seed sorting device. According to the specific technical scheme, the seed sorting device comprises a vertical air duct, a draught fan is arranged at the bottom of the vertical air duct, an air outlet pipe is arranged at the top of the vertical air duct, a material containing groove is formed above the draught fan, a separation net is arranged at the bottom of the material containing groove, and at least one seed blocking mechanism is vertically arranged outside the vertical air duct. The seed blocking mechanism comprises a winding machine and a blocking net wound on the winding machine, the two sides of the blocking net are fixed to a flexible connecting piece, a plurality of idler wheels are arranged on the outer side of the flexible connecting piece, a channel corresponding to the blocking net is formed in the vertical air duct, and the blocking net can penetrate through the channel. Sliding grooves for containing the idler wheels are formed in the vertical air duct and located on the two sides of the channel. The multi-stage seed sorting device solves the problem that multi-stage sorting cannot be conducted on seeds at the same time in the prior art.

Description

Technical Field

[0001] The present invention relates to the technical field of seed screening, and particularly to a seed sorting device. Background Art

[0002] Whether seeds are plump is an important parameter of seed quality. Plump seeds have a larger diameter, while shriveled seeds have a smaller diameter. Shriveled seeds not only affect the thousand-grain weight and vigor index of seeds, but also directly influence the germination characteristics and survival ability of seeds. Therefore, screening plump seeds is one of the key measures to improve the growth performance and yield of plants.

[0003] When the outer shapes are basically the same, it is difficult to distinguish the quality of seeds. In the existing technologies, generally the buoyancy method (soaking in water, and shriveled seeds float) is used to distinguish low-quality seeds, but this will cause unnecessary water absorption of seeds, which is not conducive to storage operations. There is also the use of gravity separation methods for screening (such as the Chinese patent with the application number CN201810143972.4), and the purpose of screening is achieved by adjusting the wind force. However, this device cannot perform multi-stage sorting on seeds at the same time. It can only sort out plump seeds at one time, and cannot perform step-by-step sorting on secondary seeds at the same time.

[0004] For secondary seeds, there is still a need for sorting. For example, they can be used for planting in non-core experimental fields or stress-tolerant environments, which can not only reduce production costs but also maximize the utilization of land resources. They can be converted into clean energy such as ethanol and biodiesel through fermentation processes. For example, corn secondary seeds have high application value in bioethanol production. In fields with lower requirements for seed quality such as forage crops and biomass energy crops, secondary seeds can reduce production costs and at the same time achieve efficient utilization of land resources. Therefore, the secondary seeds remaining after the sorting of plump seeds still have significant economic, ecological and scientific research values, and it is also necessary to sort them. Summary of the Invention

[0005] In view of the deficiencies of the prior art, the present invention provides a seed sorting device to achieve multi-stage and precise sorting of seeds and make full use of the value of secondary seeds. The present invention innovatively introduces a retractable barrier net on the basis of traditional air separation sorting, dynamically intercepts seeds of different quality grades during the air separation process, thus completing multi-stage sorting at one time and being able to maintain the integrity and usability of secondary seeds.

[0006] To achieve the above objectives, the present invention is realized through the following technical solutions:

[0007] The present invention discloses a seed sorting device, which includes a vertical air duct. A blower is provided at the bottom of the vertical air duct, and an air outlet pipe is provided at the top. A material receiving tank is arranged above the blower. The bottom of the material receiving tank is a partition net. At least one seed blocking mechanism is vertically arranged outside the vertical air duct. The seed blocking mechanism includes a winding machine and a blocking net wound on the winding machine. Both sides of the blocking net are fixed on flexible connectors. A number of rollers are arranged on the outer side of the flexible connectors. A channel corresponding to the blocking net and allowing the blocking net to pass through is provided on the vertical air duct. Chutes for accommodating the rollers are arranged on both sides of the channel inside the vertical air duct.

[0008] Preferably, the blocking mechanism is located in a receiving groove. The receiving groove is arranged on the outer side of the vertical air duct, and a discharge pipe with a valve is provided at the bottom. The winding machine includes a rotating shaft horizontally arranged in the receiving groove. The blocking net is wound on the rotating shaft. One end of the rotating shaft extending outside the receiving groove is provided with a motor.

[0009] Preferably, one end of the chute penetrates through the side wall of the channel to the outside. The starting end of the blocking net is placed on the opening of the channel. The rollers on both sides of the blocking net are located in the chute. The total width of the blocking net and the rollers on both sides is adapted to the length of the channel and is also adapted to the size of the vertical air duct on this side.

[0010] Preferably, a magnetic strip is arranged at the starting end of the blocking net. Both ends of the magnetic strip are fixed on the flexible connectors on both sides of the blocking net. A support plate is arranged on the outer side wall of the vertical air duct. The top surface of the support plate is flush with the bottom surface of the channel. The blocking net is placed on the support plate.

[0011] Preferably, the chute is horizontally or obliquely arranged in the vertical air duct. When the chute is horizontally arranged, the bottom surface of the channel is flush with the bottom of the chute. When the chute is obliquely arranged, it is arranged to incline upwards from the opening of the channel towards the vertical air duct. The bottom surface of the channel and the chute have the same inclination angle and are flush. The inclination angle of the chute ≤ 15°.

[0012] Preferably, a baffle for covering the channel is arranged at the opening of the channel inside the vertical air duct. One end of the baffle is hinged on the inner wall of the vertical air duct below the channel through a shaft, and a torsion spring is arranged on the shaft.

[0013] Preferably, the flexible connector includes a number of connecting strips connected to each other. Connecting ears are arranged at both ends of the connecting strip. The connecting ears of adjacent connecting strips are connected by a pin shaft. The total thickness of the two connected connecting ears is less than or equal to the thickness of the connecting strip. The side of the blocking net is fixed on a number of connecting strips connected to each other.

[0014] Preferably, a groove is provided on the outer side of the connecting ear, and the pin shaft passes through the groove to connect the connecting ear. Parallel clamping plates are provided on the side wall of the connecting strip along its length direction. Flexible fixing strips are respectively provided on both sides of the barrier net. Positioning holes are provided through the clamping plates, and through holes corresponding to the positioning holes are provided on the flexible fixing strips. The flexible fixing strips are placed between the clamping plates and fixed by inserting pins through the positioning holes and the through holes.

[0015] Preferably, when there are two or more of the seed blocking mechanisms, the vertical air cylinder includes a plurality of connecting cylinders inserted and connected in sequence. One of the seed blocking mechanisms is provided on the side wall of one connecting cylinder. A height adjustment mechanism is provided between the mutually connected connecting cylinders. The height adjustment mechanism includes a fixing sleeve sleeved between adjacent connecting cylinders. The fixing sleeve is fixed to the connecting cylinder located below, and an annular groove is provided on the outer wall of the connecting cylinder located below, so that an annular cavity for one end of the connecting cylinder above to be inserted is formed between the annular groove and the fixing sleeve; strip-shaped notches are correspondingly provided on the side wall of the fixing sleeve along the axial direction of the connecting cylinder. A fixing block extending outside the strip-shaped notch is provided on the outer wall of the end of the connecting cylinder inserted into the annular cavity. An expansion rod is provided on the outer wall of the fixing sleeve, and the output end of the expansion rod corresponds to the fixing block.

[0016] Preferably, a stirring mechanism is provided in the material receiving tank. The stirring mechanism includes a column fixed in the material receiving tank through a cross bar. The column and the cross bar are fixed through a bearing. A plurality of fan blades are provided on the side wall of the top end of the column, and a plurality of stirring blades are provided on the side wall of the bottom end; a limiting plate is provided on the inner wall of the vertical air cylinder above the material receiving tank;

[0017] The material receiving tank is of a drawer type or a fixed type. When it is of a drawer type, it is directly pushed into it from the side wall of the vertical air cylinder; when it is of a fixed type, the material receiving tank is pushed into it from below the vertical air cylinder and supported by a set positioning plate. At the same time, a feed hopper extending into the material receiving tank is provided on the outer wall of the vertical air cylinder, and a switch is provided at the feed port between the feed hopper and the vertical air cylinder.

[0018] The present invention has the following beneficial effects:

[0019] 1. Multi-stage sorting: The vertical air cylinder can be modularized through the connecting cylinders to achieve adjustable height, allowing multiple seed blocking mechanisms to be arranged to perform step-by-step sorting of seeds. Each stage of the barrier net intercepts seeds of different densities (sizes), realizing a continuous sorting process, and innovatively solving the problem that the prior art can only perform one-time sorting.

[0020] 2. Retractable barrier net: The starting end of the barrier net is supported and positioned by a magnetic strip and a support plate together. When the barrier net is retracted, the built-in baffle automatically closes to block the channel, preventing seed leakage and ensuring precise control during the operation process.

[0021] 3. Flexible connection mechanism: By combining a flexible connector with a roller, the barrier net can move smoothly along the chute. The barrier net is assembled with a clamping plate and a bolt through a flexible fixing strip, ensuring that the barrier net is tensioned and easy to maintain, making it more stable and reliable.

[0022] 4. Automatic control: Equipped with a driving motor and a valve, it can automatically control the deployment / retraction of the barrier net and the discharge of secondary seeds, improving the sorting efficiency and reducing the labor intensity.

[0023] 5. The present invention can improve the multi-stage sorting efficiency: By adding a movable barrier net during the winnowing process, it can intercept and collect plump seeds and secondary seeds of multiple quality grades respectively in one sorting cycle, realizing precise classification and sorting. Compared with the existing equipment that can only extract plump seeds once, the present invention can significantly improve the seed grading efficiency and recovery rate.

[0024] 6. The present invention can protect the seed quality: It avoids the problem of seed moisture absorption caused by the flotation method. The entire sorting process remains dry, ensuring the germination ability and storage stability of the seeds. The physical sorting method combining winnowing and barrier is liquid-free and treats the seeds more gently.

[0025] 7. The present invention can utilize secondary seeds for multiple purposes: The device can effectively separate lower-quality secondary seeds, which can be used for non-core agricultural purposes (such as feed, planting in stress-resistant test fields) or as biomass raw materials for the production of ethanol, biodiesel, etc., reducing production costs and improving resource utilization rate. By classifying and managing seed resources of different qualities, it can promote the sustainable utilization of biological germplasm resources and industrial upgrading.

[0026] 8. The present invention can achieve automation and adjustability: The winding-type barrier net is combined with motor drive, and structures such as a vertically adjustable air duct enable the sorting process to flexibly set parameters according to the physical characteristics of different seed varieties, with a wider scope of application and industrial availability.

[0027] In summary, the structural layout of the present invention brings superior functional effects, breaks through the limitations of traditional single-stage winnowing or flotation sorting, truly realizes the precise classification and retention utilization of secondary seeds, and improves the integrity of seed sorting and the comprehensive value of germplasm resources. The single-stage sorting based on wind power in the prior art can only complete preliminary stratification, while the present invention, through the setting of retractable barrier nets, not only retains the sorting advantages of the prior art but also innovatively increases the classification and sorting ability, with high practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a schematic structural diagram of the present invention;

[0029] Figure 2 is Figure 1 longitudinal sectional view;

[0030] Figure 3 is Figure 2 local enlarged view of A in

[0031] Figure 4 schematic diagram of one end of the connecting cylinder with an annular groove;

[0032] Figure 5 schematic diagram of the connection part of two connecting cylinders;

[0033] Figure 6 is Figure 1 view A - A in

[0034] Figure 7 is Figure 6 schematic diagram of the barrier net extending into the connecting cylinder on the basis of (the barrier net blocks the connecting cylinder);

[0035] Figure 8 is Figure 7 local enlarged view of B in

[0036] Figure 9 schematic diagram of the connection of two connecting bars;

[0037] Figure 10 schematic diagram of the barrier net;

[0038] Figure 11 top view of the material - holding tank;

[0039] Figure 12 is Figure 2 schematic diagram of the structure with the sliding groove inclined on the basis of ;

[0040] In the figure: fan 1, air outlet pipe 2, material - holding tank 3, partition net 4, barrier net 5, roller 6, channel 7, sliding groove 8, storage tank 9, discharge pipe 10, rotating shaft 11, motor 12, magnetic strip 13, support plate 14, baffle 15, connecting bar 16, connecting ear 17, groove 18, clamping plate 19, flexible fixing strip 20, positioning hole 21, through - hole 22, connecting cylinder 23, fixing sleeve 24, annular groove 25, annular cavity 26, strip - shaped notch 27, fixing block 28, telescopic rod 29, cross - bar 30, upright post 31, fan blade 32, stirring blade 33, limiting plate 34. Specific embodiments

[0041] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0042] Unless otherwise specified, the technical means used in the implementation examples are conventional means well known to those skilled in the art.

[0043] Reference Figures 1 - 12 , the present invention discloses a seed sorting device, which is implemented through the following structure and system:

[0044] Overall structure of the device: The vertical air duct 1 is a vertical cylindrical shape, with a blower installed at the bottom and an air outlet pipe at the top. A material storage tank 3 is arranged at the lower part of the vertical air duct for temporarily storing seeds to be sorted. A partition net 4 is provided at the bottom of the material storage tank to prevent seeds from being carried away by the wind and allow air to pass through. A storage groove 9 is arranged along the vertical direction on the outer side wall of the vertical air duct, and a winding machine is installed inside. The winding machine is controlled by a motor 12. The barrier net 5 is usually wound and stored in the storage groove. During operation, the winding machine (rotating shaft 11) sends out the barrier net, and the net surface walks along the chute 8 until it blocks the cross-section of the vertical air duct, forming a net barrier. Seeds of different gravities rise into the vertical air duct under the action of wind, and seed clusters are formed at different heights and are located above the barrier net (or chute). Finally, seeds of different qualities are intercepted by the barrier net.

[0045] Barrier net and collection system: Both sides of the barrier net are connected to the winding machine through flexible connectors. Rollers 6 are arranged outside the connectors and can move along the chute to ensure smooth cooperation between the barrier net and the chute. In order to facilitate the falling out of seeds, a magnetic strip 13 is equipped at the end of the barrier net to accurately position the barrier net in the vertical air duct. A discharge pipe 10 with a valve is arranged at the lower part of the storage groove. After the seeds are collected by the barrier net, the blower is turned off and the barrier net is retracted. At this time, the blocked seeds fall along the barrier net into the lower storage groove and are discharged by opening the valve, thus completing the single collection of seeds of a certain level.

[0046] Multi-stage sorting system: When more detailed sorting is required, multiple blocking mechanisms can be set at different heights of the vertical air duct. Each stage of the barrier net corresponds to intercepting seeds of different quality grades. As one implementation method, for example, the first barrier net can intercept the lightest (medium-quality) seeds; after retracting and discharging for the first time, the blower is started again and the remaining seeds are continuously conveyed to the second barrier net to intercept the second-lightest quality seeds, and so on. Through step-by-step interception and collection, multi-stage sorting within a set of sorting devices is achieved. As another implementation method, for example, by adjusting the height of the vertical air duct, that is, the distance between adjacent barrier nets, multi-stage sorting of seeds can be achieved simultaneously.

[0047] Wind speed and height adjustment structure: The air volume of the fan is adjustable to control the critical separation point of seeds of different qualities. The height of the barrier net can be designed according to the size of the seeds. The distance between two adjacent seed blocking mechanisms can be adjusted through a telescopic rod to adapt to the separation points of seeds of different qualities. As another implementation, according to the type of seeds, when the above adjustments cannot meet the requirements of multi-stage sorting, that is, when the driving telescopic rod can no longer adjust the distance between the seed blocking mechanisms or cannot adjust the seed blocking mechanisms to the appropriate positions, connecting cylinders of different heights can be replaced and then adjusted in combination with the telescopic rod to enable the best sorting effect for different crop seeds.

[0048] The specific structure of the seed sorting device disclosed by the present invention is as follows:

[0049] The seed sorting device includes a vertical air duct, preferably square in shape. A fan 1 is provided at the bottom of the vertical air duct, preferably an axial flow fan. An air outlet pipe 2 is provided at the top. Above the fan 1, a material storage tank 3 is provided. The bottom of the material storage tank 3 is a partition net 4. The material storage tank and the fan are arranged correspondingly. The air blown by the fan passes through the partition net to blow up the seeds in the material storage, so that the empty and shriveled seeds and impurities such as seed husks are blown out through the air outlet pipe. At the same time, whether there are plump or secondary seeds can be observed through the blown impurities and other conditions, so as to adjust the wind force of the fan.

[0050] At least one seed blocking mechanism is vertically arranged outside the vertical air duct. The fan blows up the seeds in the vertical air duct and makes them suspended in the vertical air duct. Seeds of basically the same quality will be suspended within a certain height to form a seed mass. At this time, by setting a seed blocking mechanism below the seed mass and closing or reducing the wind force of the fan, the seeds will fall on the seed blocking mechanism and then be discharged outside the vertical air duct to collect seeds of different grades. When only plump seeds need to be collected, only one seed blocking mechanism needs to be set or only the seed blocking mechanism below the plump seeds needs to be opened.

[0051] Specifically: the seed blocking mechanism includes a winder and a barrier net 5 wound on the winder, the two sides of the barrier net 5 are fixed on the flexible connector, and the flexible connector supports the two sides of the barrier net to prevent it from being unable to be unfolded and supported in the vertical wind tube due to its softness. A plurality of rollers 6 are arranged on the outside of the flexible connector, and a channel 7 corresponding to the barrier net 5 and for the barrier net 5 to pass through is arranged on the vertical wind tube, and slide grooves 8 for accommodating the rollers 6 are arranged on both sides of the channel 7 in the vertical wind tube. It should be noted that: one end of the chute 8 passes through the side wall of the channel 7, the starting end of the barrier net 5 is placed at the opening of the channel 7, and the rollers 6 on both sides of the starting end of the barrier net 5 are located in the chute 8 at the opening of the channel. When the barrier net is rolled up or unfolded, the rollers will not leave the chute. The total width of the barrier net 5 and the rollers 6 on both sides is adapted to the length of the channel 7, and is also adapted to the size of the vertical wind tube on this side, so that when the winder rotates, it will push the barrier net to slide along the chute toward the vertical wind tube until the barrier net blocks the vertical wind tube. Since the barrier net needs to be extended into the vertical wind tube and located below the seed group during the process of starting the fan, it is necessary to set a chute and a roller so that the roller is always located in the chute. In the presence of wind, the barrier net can still be pushed toward the vertical wind tube under the action of the roller. The roller is composed of a shaft and a bearing, which is an existing part, so that it moves smoothly in the chute.

[0052] Furthermore, the blocking mechanism is located in the storage slot 9, the storage slot 9 is arranged outside the vertical wind tube, and a discharge pipe 10 with a valve is arranged at the bottom, the winding machine includes a rotating shaft 11 arranged horizontally in the storage slot 9, the barrier net 5 is wound on the rotating shaft 11, and a motor 12 is arranged at one end of the rotating shaft 11 extending outside the storage slot 9. The rotating shaft is driven by the motor to rotate, so as to roll up or unfold the barrier net. It should be noted that: since the length of the channel is equal to the length of the side of the vertical wind tube, after the fan is turned on, a large amount of wind will run out of the channel mouth, thereby causing the seeds to run out. Therefore, a baffle 15 covering the channel 7 is arranged at the opening of the channel 7 in the vertical wind tube, and one end of the baffle 15 is hinged to the inner wall of the vertical wind tube below the channel 7 through an axis, and a torsion spring is arranged on the axis. When the winding machine rotates and pushes the barrier net to move toward the vertical wind tube, the baffle is pushed open, so that the barrier net moves toward the vertical wind tube along the slide slot. When the barrier net is closed, the baffle is automatically reset under the action of the torsion spring, and the seeds falling on the barrier net fall into the receiving groove for collection.

[0053] Furthermore, since the sliding grooves are provided on the inner walls of the vertical air ducts on both sides of the channel and penetrate to the outside of the side walls, the baffle cannot block the sliding grooves at the opening of the channel. There will still be air leakage. At the same time, when the barrier net extends into the vertical air duct, the baffle 15 will be opened, so that a large amount of air flows out through the channel, which will blow out the seeds. At the same time, it will cause a change in the buoyancy force on the seed mass in the vertical air duct, and then cause a change in the position of the seed mass, and then it is impossible to accurately extend the barrier net below the seed mass. Therefore, the storage tank needs to be set as a closed type to solve this situation, that is, the storage tank is a closed box structure, and the connection between the storage tank and the vertical air duct is only controlled by the discharge pipe and valve provided at the bottom; when the valve is closed, the storage tank is in a closed state, avoiding the air flow overflowing from the sliding groove flowing through the storage tank and the air flow running out through the storage tank after the barrier net pushes the baffle open, ensuring that the air flow entering the vertical air duct only goes out through the air outlet pipe at the top.

[0054] Further, in order to ensure the stability of the barrier net placed at the channel opening and prevent the starting end of the barrier net from detaching from the opening of the channel during the winding and unwinding process. A magnetic strip 13 is provided at the starting end of the barrier net 5, and both ends of the magnetic strip 13 are fixed on the flexible connectors on both sides of the barrier net 5. A support plate 14 is provided on the outer side wall of the vertical air duct to increase the area where the barrier net is placed at the channel opening. The top surface of the support plate 14 is flush with the bottom surface of the channel 7, and the barrier net 5 is placed on the support plate 14. At the same time, the vertical air duct can be made of a metal material that can be adsorbed by the magnetic strip, so that after the barrier net extends into the vertical air duct, it is magnetically fixed to the inner wall of the vertical air duct. Or, directly set the side wall on the side of the vertical air duct corresponding to the barrier net as a metal material or the same magnetic sheet, so that the magnetic strip on the barrier net is magnetically fixed when it reaches this position, thereby increasing the stability of the barrier net in the vertical air duct.

[0055] Furthermore, the baffle or the same position as the baffle is also set as a metal material or a magnetic sheet. When the baffle automatically resets, it will generate a suction force on the magnetic strip to prevent the barrier net from taking the magnetic strip and detaching from the opening of the channel. In the present invention, the winding and unwinding of the barrier net are controlled by the motor 12, and the winding and unwinding lengths are controlled by controlling the number of turns of the motor.

[0056] Reference Figure 2 、 Figure 12As shown, the chute 8 is horizontally or obliquely arranged in the vertical wind tube. When the chute 8 is horizontally arranged, the bottom surface of the channel 7 is flush with the bottom of the chute 8. At the same time, the support plate is flush with the bottom surface of the channel, so that the roller can move smoothly in the chute to avoid the height difference causing obstacles during the movement of the roller; when the chute 8 is inclined, it is inclined upward from the opening of the channel 7 toward the vertical wind tube. The bottom surface of the channel 7 has the same inclination angle as the chute 8 and is flush. Similarly, the top surface of the support plate 14 is also flush with the bottom surface of the channel, and the inclination angle of the chute 8 is ≤15°. The inclined setting of the chute can facilitate the seeds to roll into the storage tank through the barrier net. If it is set horizontally, it needs to be transported to the storage tank with the help of the barrier net during the winding process. It can be set according to the shape of the seeds and other conditions.

[0057] Further, the flexible connector includes a plurality of interconnected connecting strips 16, and connecting ears 17 are provided at both ends of the connecting strips 16. It can be understood that the connecting strip is T-shaped, and the connecting ears 17 of adjacent connecting strips 16 are connected by a pin, and the total thickness of the two connecting ears 17 connected together is less than or equal to the thickness of the connecting strip 16, and the side of the barrier net 5 is fixed on the plurality of interconnected connecting strips 16. It should be noted that: refer to Figure 9 As shown, as a preferred solution, the side surfaces of the two connecting ears on both sides of a connecting strip are flush with the outer side surfaces of the connecting strip, and the thickness is less than or equal to half of the thickness of the connecting strip. The connecting ears on adjacent connecting strips are interlocked and hinged by a pin. The limitation on the thickness of the connecting ears is mainly to avoid the two ends of the pin extending out of the connecting ears when the two are connected by the pin, occupying a certain space and affecting the formation of a large gap between the connection side of the barrier net and the barrier net. The mutually hinged connecting strips can not only be wound up by a winding machine, but also provide certain support to the barrier net, and can give the barrier net a certain stability as the barrier net is wound up and unfolded, as well as the stability of the barrier net during operation. The magnetic strip is fixed between the two connecting strips or connecting ears at the starting end, refer to Figure 7 , Figure 8 As shown. The setting of the magnetic strip can prevent the flexible connectors on both sides from moving toward the middle, that is, the middle of the barrier net collapses, causing the roller to detach from the slide slot. As a preferred solution, support rods are set between the corresponding connecting strips (or flexible connectors) below the barrier net, and the support rods can be set at a certain distance. It can be set according to the length of the barrier net. Its main purpose is to prevent the barrier net from collapsing after it is unfolded, causing the roller to detach from the slide slot and causing the entire barrier net to fall into the vertical wind tunnel. Of course, there is another way to solve this problem, that is, to set the slide slot into a T-shaped slot, the roller is placed in the slide slot, and the shaft on the roller passes through the slide slot and is fixed to the connecting strip. With this setting, there is no situation where the roller detaches from the slide slot. Therefore, both methods can be set, or one of them can be set, and it can be set according to the actual situation.

[0058] Further, a groove 18 is provided on the outer side of the connecting ear 17, and the pin shaft passes through the groove 18 to connect the connecting ear 17, preventing the end of the pin shaft from protruding outside the connecting ear and affecting the installation of the barrier net. On the side wall of the connecting strip 16, clamping plates 19 parallel to each other are arranged along the length direction thereof. Flexible fixing strips 20 are respectively arranged on both sides of the barrier net 5. The flexible fixing strips can be made of rubber, mainly for fixing the edges of the barrier net, preventing the barrier net from being directly fixed to the clamping plates. Under the pulling of external force, the holes for the bolt pins to pass through on the barrier net become larger and larger, and then the barrier net collapses and cannot be tightened, causing the seeds to not roll into the receiving groove through the barrier net but only be transported to the receiving groove by winding. The flexible fixing strips can be an integral body or segmented like the connecting strip. When they are segmented, the distance between them should be as effective as possible. As another implementation manner, the periphery of the barrier net can be directly rubber-coated.

[0059] Further, positioning holes 21 are provided through the clamping plates 19, that is, the positioning holes penetrate through the two clamping plates. Through holes 22 corresponding to the positioning holes 21 are provided on the flexible fixing strips 20. The flexible fixing strips 20 are placed between the clamping plates 19 and fixed by inserting bolt pins through the positioning holes 21 and the through holes 22. Spring bolt pins can be selected for the bolt pins, which is convenient for operation. It should be noted that: the number of the positioning holes and the through holes is set according to actual needs. For the setting of the clamping plates, they can be arranged on each connecting strip or at intervals, and can be set according to needs. Similarly, for the setting of the rollers, they can be arranged on each connecting strip or at intervals.

[0060] Further, when it is necessary to screen the secondary seeds, two or more seed blocking mechanisms are provided. At this time, due to problems such as the weight and size of the seeds, the secondary seeds do not always suspend at the same height position in the vertical air duct, that is, the height at which the seeds suspend changes. In this case, it is necessary to adjust the height of the seed blocking mechanism. At this time, the vertical air duct is set to be segmented, that is, the vertical air duct includes a plurality of connecting cylinders 23 inserted and connected in sequence. Only one seed blocking mechanism is provided on the side wall of one connecting cylinder 23. A height adjustment mechanism is provided between the connected connecting cylinders 23, so as to realize the adjustment of the height of the seed blocking mechanism.

[0061] Specifically, the height adjustment mechanism includes a fixing sleeve 24 sleeved between adjacent connecting cylinders 23. The fixing sleeve 24 is fixed to the connecting cylinder 23 located below, and an annular groove 25 is provided on the outer wall of the connecting cylinder 23 located below, so that an annular cavity 26 for inserting one end of the connecting cylinder 23 above is formed between the annular groove 25 and the fixing sleeve 24; the height of the annular groove determines the height at which the connecting cylinder located below is inserted into the connecting cylinder above, and also determines the adjustable height range between the two connected connecting cylinders. The top surface of the fixing sleeve can be flush with or higher than the top surface of the connecting cylinder provided with the annular groove. The setting of the annular sleeve ensures the stability of the connection between adjacent connecting cylinders and the stability during height adjustment. At the same time, in order to increase the sealing performance of the connecting cylinder inserted into the annular cavity, a sealing ring can be provided on the outer wall of the annular groove and / or the inner wall of the fixing sleeve.

[0062] Bar-shaped notches 27 are correspondingly provided on the side wall of the fixing sleeve 24 along the axial direction of the connecting cylinder 23. The top of the bar-shaped notch is open or closed. The height of the bar-shaped notch in combination with the height of the annular groove determines the adjustment height of the connecting cylinder. There are two bar-shaped notches and they are correspondingly arranged. A fixing block 28 extending outside the bar-shaped notch 27 is provided on the outer wall of the end of the connecting cylinder 23 inserted into the annular cavity 26, and a telescopic rod 29 is provided on the outer wall of the fixing sleeve 24. The output end of the telescopic rod 29 corresponds to the fixing block 28. The telescopic rod includes, but is not limited to, a cylinder, an electric push rod, and a hydraulic push rod, and its output end can be fixed to or in contact with the bottom surface of the fixing block. When adjusting the height, two telescopic rods are started simultaneously to move the connecting cylinder above upward, so as to adjust the height of the seed blocking mechanism on the connecting cylinder to adapt to the change in the suspension height when the type of seeds changes. It should be noted that in the present invention Figure 2 the height of the seed blocking mechanism close to the material storage tank is not adjustable. Therefore, when sorting different types of seeds, taking the seed blocking mechanism close to the material storage tank as the standard, adjust the wind force so that the plump seeds are suspended above the chute adapted to the seed blocking mechanism, and then adjust the height of the connecting cylinder by observing the height of the remaining secondary seeds. Of course, as another implementation manner, the connecting cylinder of the seed blocking mechanism close to the material storage tank can also be set to be segmented to adjust the height of the seed blocking mechanism for sorting plump seeds, so as to make the sorting of seeds more flexible.

[0063] Further, to prevent seeds from accumulating in the material storage tank, making it difficult for air to pass through the tank. A stirring mechanism is provided in the material storage tank 3. The stirring mechanism includes a vertical column 31 fixed in the material storage tank 3 through a cross bar 30. The vertical column 31 and the cross bar 30 are fixed by bearings. A plurality of fan blades 32 are provided on the side wall at the top of the vertical column 31, and a plurality of stirring blades 33 are provided on the side wall at the bottom. The cross bar is arranged between the stirring blades and the fan blades to increase the stability of the vertical column during rotation. A limiting plate 34 is provided on the inner wall of the vertical air duct, above the material storage tank 3. The setting of the limiting plate can prevent the material storage tank from being blown up when the wind force is too large or the amount of seeds in the tank is small.

[0064] Further, the material storage tank 3 can be set as a drawer type or a fixed type. When it is of the drawer type, it is directly pushed into the vertical air duct from the side wall of the vertical air duct, which is the same principle as the existing push-pull drawer, and a handle is provided on the outer side of the material storage tank facing outward.

[0065] When it is of the fixed type, the material storage tank 3 is pushed into it from below the vertical air duct and supported by a horizontally arranged positioning plate. At the same time, a feed hopper extending into the material storage tank 3 is provided on the outer wall of the vertical air duct. A switch is provided at the feed port between the feed hopper and the vertical air duct. The switch is of the pull-out type, referring to the switch of the existing granary. It can also be achieved by setting a feed pipe at the feed port and setting a valve on the feed pipe to close and open the feed port. For the setting of the feed hopper, it can also be set when the material storage tank is of the drawer type, and it can be combined according to actual needs.

[0066] For the sorting device disclosed in the present invention, after a batch of seeds is sorted, another batch of seeds is added to achieve the simultaneous sorting of plump seeds and different secondary seeds, without continuous sorting.

[0067] When using the present invention, close the valve on the storage tank, load the seeds in the material storage tank, and the amount of seeds does not exceed half of the depth of the material storage tank. After loading the seeds, dig a few pits in the seeds to expose the partition net at the bottom, so that after the fan is turned on, the air can pass through the material storage tank faster, drive the fan blades to rotate, and then drive the stirring blades to rotate, so that the air blows up the seeds. Then, through the observation window on the side wall of the vertical air duct, observe the suspension situation of the seeds, adjust the height of the suspended seed mass by adjusting the wind force, so that the seed masses are respectively located above the corresponding seed blocking mechanisms. If there is a seed mass that is not located above the seed blocking mechanism, then start the telescopic member and adjust the height of the seed blocking mechanism by adjusting the connecting cylinder, so that the seed mass is located above the seed blocking mechanism. Because the present invention can only increase the height of the seed blocking mechanism and cannot decrease it, when adjusting the wind force, the seed mass cannot be located below the seed blocking mechanism, or, as much as possible, make multiple seed masses respectively located above the corresponding seed blocking mechanisms.

[0068] When the seed mass reaches the designated position, and at the same time, when all the seeds in the material storage tank are suspended, start the motor to push the barrier net into the connecting cylinder until the cross-section of the connecting cylinder is completely blocked. Then, turn off the blower so that the suspended seeds fall onto the corresponding barrier net. Next, wind up the barrier net to convey seeds of different grades to the corresponding storage tanks. When the motor rotates to the designated number of turns, close the baffle. Pour seeds into the material storage tank again and repeat the above operations to complete the multi-stage sorting of seeds.

[0069] Using the sorting device disclosed in the present invention and following the above operation process, technicians can achieve good practice in the seed grading and screening work of many plants, such as seeds of Compositae plants (such as sunflowers), Sapindaceae plants (such as Acer palmatum), Gramineae plants (such as rice), and Umbelliferae plants (such as fennel).

[0070] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0071] The embodiments described above are only for describing the preferred mode of the present invention and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solution of the present invention shall fall within the protection scope determined by the claims of the present invention.

Claims

1. A seed sorting device, characterized in that: It includes a vertical air duct. A fan (1) is arranged at the bottom of the vertical air duct, and an air outlet pipe (2) is arranged at the top. A material storage tank (3) is arranged above the fan (1). The bottom of the material storage tank (3) is a partition net (4). At least one seed blocking mechanism is vertically arranged outside the vertical air duct. The seed blocking mechanism includes a winding machine and a blocking net (5) wound on the winding machine. Both sides of the blocking net (5) are fixed on flexible connectors. A number of rollers (6) are arranged on the outer side of the flexible connectors. A channel (7) corresponding to the blocking net (5) and allowing the blocking net (5) to pass through is arranged on the vertical air duct. Chutes (8) for accommodating the rollers (6) are arranged on both sides of the vertical air duct inside the channel (7).

2. The seed sorting device according to claim 1, characterized in that: The blocking mechanism is located in a storage tank (9). The storage tank (9) is arranged outside the vertical air duct, and a discharge pipe (10) with a valve is arranged at the bottom. The winding machine includes a rotating shaft (11) horizontally arranged in the storage tank (9). The blocking net (5) is wound around the rotating shaft (11). One end of the rotating shaft (11) extending outside the storage tank (9) is provided with a motor (12).

3. The seed sorting device according to claim 1, characterized in that: One end of the chute (8) penetrates through the side wall of the channel (7) to the outside. The starting end of the blocking net (5) is placed on the opening of the channel (7). The rollers (6) on both sides of the blocking net (5) are located in the chute (8). The total width of the blocking net (5) and the rollers (6) on both sides is adapted to the length of the channel (7), and at the same time is adapted to the size of the vertical air duct on this side.

4. The seed sorting device according to claim 3, wherein: A magnetic strip (13) is arranged at the starting end of the blocking net (5). Both ends of the magnetic strip (13) are fixed on the flexible connectors on both sides of the blocking net (5). A support plate (14) is arranged on the outer side wall of the vertical air duct. The top surface of the support plate (14) is flush with the bottom surface of the channel (7). The blocking net (5) is placed on the support plate (14).

5. A seed sorting device according to any one of claims 1 to 4, characterized in that: The chute (8) is horizontally or obliquely arranged in the vertical air duct. When the chute (8) is horizontally arranged, the bottom surface of the channel (7) is flush with the bottom of the chute (8). When the chute (8) is obliquely arranged, it is arranged to tilt upwards from the opening of the channel (7) towards the vertical air duct. The bottom surface of the channel (7) has the same inclination angle as the chute (8) and is flush. The inclination angle of the chute (8) ≤ 15°.

6. The seed sorting device according to claim 5, wherein: A baffle (15) covering the channel (7) is arranged at the opening of the channel (7) inside the vertical air duct. One end of the baffle (15) is hinged on the inner wall of the vertical air duct below the channel (7) through a shaft, and a torsion spring is arranged on the shaft.

7. The seed sorting device according to claim 1, wherein: The flexible connector includes a number of connecting strips (16) connected to each other. Connecting ears (17) are arranged at both ends of the connecting strip (16). The connecting ears (17) of adjacent connecting strips (16) are connected by a pin shaft. The total thickness of the two connected connecting ears (17) is less than or equal to the thickness of the connecting strip (16). The side of the blocking net (5) is fixed on a number of connecting strips (16) connected to each other.

8. The seed sorting device according to claim 7, characterized in that: On the outer side of the connecting ear (17), there is a groove (18). The pin shaft passes through the groove (18) to connect the connecting ear (17). On the side wall of the connecting bar (16), there are parallel clamping plates (19) arranged along its length direction. On both sides of the barrier net (5), there are flexible fixing strips (20) respectively. There are positioning holes (21) penetrating through the clamping plates (19). On the flexible fixing strip (20), there are through holes (22) corresponding to the positioning holes (21). The flexible fixing strip (20) is placed between the clamping plates (19) and fixed by inserting a pin through the positioning hole (21) and the through hole (22).

9. The seed sorting device according to claim 1, wherein: When there are two or more of the seed blocking mechanisms, the vertical air duct includes a plurality of connecting cylinders (23) inserted and connected in sequence. One of the seed blocking mechanisms is arranged on the side wall of one connecting cylinder (23). There is a height adjusting mechanism between the mutually connected connecting cylinders (23). The height adjusting mechanism includes a fixing sleeve (24) sleeved between adjacent connecting cylinders (23). The fixing sleeve (24) is fixed to the connecting cylinder (23) located below. And on the outer wall of the connecting cylinder (23) located below, there is an annular groove (25), so that an annular cavity (26) for one end of the upper connecting cylinder (23) to be inserted is formed between the annular groove (25) and the fixing sleeve (24); on the side wall of the fixing sleeve (24), there are strip-shaped notches (27) arranged corresponding to the axial direction of the connecting cylinder (23). On the outer wall of the end of the connecting cylinder (23) inserted into the annular cavity (26), there is a fixing block (28) extending out of the strip-shaped notch (27). On the outer wall of the fixing sleeve (24), there is a telescopic rod (29), and the output end of the telescopic rod (29) corresponds to the fixing block (28).

10. A seed sorting device according to claim 1, characterized in that: In the material storage tank (3), there is a stirring mechanism. The stirring mechanism includes a column (31) fixed in the material storage tank (3) through a cross bar (30). The column (31) and the cross bar (30) are fixed through a bearing. On the side wall at the top end of the column (31), there are a plurality of fan blades (32), and on the side wall at the bottom end, there are a plurality of stirring blades (33); on the inner wall of the vertical air duct, above the material storage tank (3), there is a limiting plate (34). The material storage tank (3) is of a drawer type or a fixed type. When it is of a drawer type, it is directly pushed into the vertical air duct from the side wall; when it is of a fixed type, the material storage tank (3) is pushed into it from below the vertical air duct and supported by a set positioning plate. At the same time, on the outer wall of the vertical air duct, there is a feed hopper extending into the material storage tank (3), and there is a switch at the feed inlet between the feed hopper and the vertical air duct.

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