Drying tower

Abstract

The utility model discloses a drying tower, and relates to the technical field of grain drying and storage, the drying tower comprises a feeding assembly, a moisture grading assembly and a plurality of drying assemblies, the feeding assembly is used for conveying grain, the moisture grading assembly is provided with a feeding port and a plurality of discharging ports distributed in the vertical direction, the drying tower comprises a first moisture detection structure and a plurality of grading structures, the first moisture detection structure is arranged corresponding to the feeding port so as to detect the moisture content of grains at the feeding port, the multiple grading structures are arranged below the first moisture detection structure and correspond to the multiple discharging ports respectively, the multiple grading structures convey the grains to the corresponding discharging ports in a grading mode according to the moisture content of the grains, and the multiple drying assemblies are arranged at intervals and are used for drying the grains. The multiple drying assemblies are arranged corresponding to the multiple discharging openings so as to dry grains with different water contents, and the temperatures of any two drying assemblies are arranged at intervals. Through the arrangement, the drying effect and drying uniformity can be guaranteed, so that the energy utilization efficiency is improved, resource waste is reduced, and the sustainable development capacity of the drying tower is improved.

Description

Technical Field

[0001] This utility model relates to the field of grain drying and storage technology, and in particular to a drying tower. Background Technology

[0002] Currently, tower dryers are mostly of two types: continuous tower dryers and circulating tower dryers. Circulating tower dryers typically have only one tempering section and one drying section. After each pass through the tempering and drying sections, the grain is lifted by an elevator, and this process is repeated. The drying temperature is generally not high, resulting in uniform drying and good quality. Continuous tower dryers usually consist of multiple drying sections and multiple tempering sections, with the drying and tempering sections alternating. They also have storage and cooling sections. They feature single-stage drying (high-moisture rice may require secondary drying). The dried grain is discharged from the machine by a discharge mechanism. The drying temperature is higher, and although the drying speed is faster than that of circulating tower dryers, its high-temperature characteristics are not suitable for drying grains like rice.

[0003] However, although these two types of tower dryers use different drying methods, their overall structures are similar. All grains are dried together from top to bottom without differentiation based on moisture content. Drying grains with significantly different moisture contents together inevitably leads to uneven drying and even grain cracking, resulting in resource waste, low energy efficiency, and hindering sustainable development. Utility Model Content

[0004] The main purpose of this invention is to propose a drying tower that aims to improve the problems of existing tabletop dryers, which are prone to resource waste, low energy efficiency, and are not conducive to sustainable development.

[0005] To achieve the above objectives, the drying tower proposed in this utility model includes:

[0006] Feeding assembly, used to transport grain;

[0007] A moisture grading component, comprising an inlet and multiple outlets spaced vertically, includes a first moisture detection structure and multiple grading structures. The first moisture detection structure is positioned corresponding to the inlet to detect the moisture content of the grain at the inlet. The multiple grading structures are located below the first moisture detection structure and are respectively positioned corresponding to the multiple outlets. The multiple grading structures are used to grade and convey the grain to the corresponding outlet based on its moisture content.

[0008] Multiple drying components are arranged at intervals, and each drying component corresponds to a discharge port. The multiple drying components are used to dry grains with different moisture contents.

[0009] Among the plurality of drying components, the drying temperatures of any two drying components are set at intervals.

[0010] In one embodiment, the plurality of hierarchical structures includes a first hierarchical structure, the first hierarchical structure comprising:

[0011] A first rotating shaft extends horizontally and is disposed below the feed inlet, and is rotatably configured along a horizontally extending axis; and,

[0012] A first grading plate is disposed on the first rotating shaft so as to rotate synchronously with the first rotating shaft, and the grading plate is arranged in a spiral along the horizontal direction;

[0013] The plurality of discharge ports include a first discharge port, which is located on the horizontally upward side of the grading plate.

[0014] In one embodiment, the plurality of discharge ports include a second discharge port, which is located below the first rotating shaft;

[0015] The plurality of hierarchical structures include a second hierarchical structure, the second hierarchical structure comprising:

[0016] A second rotating shaft extends horizontally and is disposed below the second discharge port; the second rotating shaft is rotatably configured along its horizontally extending axis; and,

[0017] The second grading plate is disposed on the second rotating shaft and rotates synchronously with the second rotating shaft. During the rotation stroke of the second grading plate, the second grading plate has a blocking state of blocking the second discharge port and an opening state of opening the second discharge port.

[0018] In one embodiment, the first grading structure further includes a first discharge channel, the first discharge channel connecting the first discharge port to one of the drying components; and / or,

[0019] The second grading structure also includes a second discharge channel, which connects the second discharge port to another of the drying components.

[0020] In one embodiment, each of the drying components includes:

[0021] A preheating chamber is provided corresponding to one of the discharge ports, and the upper end of the preheating chamber is connected to the outside.

[0022] A drying chamber, located below and connected to the preheating chamber, is used for drying grain; and,

[0023] The discharge hopper is located below the drying chamber and is connected to the drying chamber. The discharge hopper is used to output the dried grain.

[0024] In one embodiment, the drying chamber includes:

[0025] The warehouse body; and,

[0026] Multiple screening groups are spaced apart in the vertical direction within the silo. Each screening group includes multiple screening structures spaced apart in the horizontal direction. Each screening structure is connected to the opposite side walls of the silo in the horizontal direction at both ends. The multiple screening structures of two adjacent screening groups are staggered in the horizontal direction.

[0027] In one embodiment, each of the screening structures includes two screening plates spaced apart horizontally upwards, with the upper end of each screening plate bent toward the other screening plate to connect to the other screening plate.

[0028] In one embodiment, the silo body has multiple ventilation holes on both horizontally opposite side walls. The multiple ventilation holes on the same side wall are respectively provided for multiple screening structures and are located below the corresponding screening structures.

[0029] The drying chamber also includes a hot air structure, which is provided on one side wall of the chamber and connected to a plurality of ventilation holes on the side wall to blow hot air into the corresponding plurality of ventilation holes.

[0030] In one embodiment, the drying tower further includes a plurality of circulation components, each circulation component being configured corresponding to one of the drying components, and each circulation component comprising:

[0031] A second moisture detection structure is provided in the discharge hopper, and the second moisture detection structure is used to detect the moisture content of the grain in the discharge hopper; and,

[0032] A circulating lifting structure is provided, connecting the preheating chamber and the discharge chamber. The circulating lifting structure is used to lift and transport the grain in the discharge chamber to the preheating chamber for re-drying when the moisture content of the grain in the discharge chamber is not up to standard.

[0033] In one embodiment, the feeding assembly includes:

[0034] Feeding structure, used to receive incoming materials;

[0035] A feeding and lifting structure extends vertically, its lower end connected to the feeding structure. The feeding and lifting structure is used to lift and transport grain from the feeding structure upwards.

[0036] A feeding structure is located above the feeding structure and connected to the upper end of the feeding and lifting structure. The feeding structure is used to feed the grain transported by the feeding and lifting structure to the feeding port.

[0037] In the technical solution of this utility model, firstly, the feeding component transports the grain to the inlet. The grain enters the moisture grading component from the inlet. At this time, the first moisture detection structure can detect the moisture content of the grain. According to the different moisture contents, multiple grading structures can group the grain. The grouped grain is then transported from the corresponding outlet to multiple drying components through different grouping structures. Since the drying temperature of any two drying components differs, each drying component can perform targeted drying work on grain with a corresponding moisture content, thereby ensuring that grain with different moisture contents can achieve a good drying effect and guaranteeing the uniformity of grain drying. This configuration, by performing targeted drying on grain with different moisture contents, can guarantee the drying effect and drying uniformity, thereby improving energy utilization efficiency, reducing resource waste, and enhancing the sustainable development capability of the drying tower. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0039] Figure 1 This is a schematic diagram of the structure of an embodiment of the drying tower provided by this utility model;

[0040] Figure 2 for Figure 1 A front view of the drying tower;

[0041] Figure 3 for Figure 1 Cross-sectional schematic diagram of the moisture fractionation component;

[0042] Figure 4 for Figure 1 A schematic diagram of the discharge hopper and screening structure.

[0043] Explanation of icon numbers:

[0044] 100. Drying tower; 1. Feeding assembly; 11. Feeding structure; 12. Feeding lifting structure; 13. Discharging structure; 2. Moisture classification assembly; 21. First classification structure; 211. First rotating shaft; 212. First classification plate; 22. Second classification structure; 221. Second rotating shaft; 222. Second classification plate; 3. Drying assembly; 31. Preheating chamber; 32. Drying chamber; 33. Discharge chamber; 34. Screening structure; 341. Screening plate; 35. Ventilation hole; 4. Hot air structure; 5. Circulation assembly.

[0045] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0046] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0047] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0048] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0049] This invention proposes a drying tower. It aims to address the problems of existing tabletop dryers, which easily lead to resource waste, low energy efficiency, and are detrimental to sustainable development.

[0050] Please see Figure 1-2In one embodiment of this utility model, the drying tower 100 includes a feeding component 1, a moisture grading component 2, and a plurality of drying components 3. The feeding component 1 is used to transport grain. The moisture grading component 2 has a feed inlet and a plurality of discharge outlets arranged at intervals along the vertical direction. The moisture grading component 2 includes a first moisture detection structure and a plurality of grading structures. The first moisture detection structure is set corresponding to the feed inlet and is used to detect the moisture content of the grain at the feed inlet. The plurality of grading structures are all set below the first moisture detection structure and are respectively set corresponding to the plurality of discharge outlets. The plurality of grading structures are used to grade and transport the grain to the corresponding discharge outlet according to the moisture content of the grain. The plurality of drying components 3 are arranged at intervals, and each drying component 3 corresponds to one discharge outlet. The plurality of drying components 3 are used to dry grains with different moisture contents. The drying temperatures of any two drying components 3 are set at intervals.

[0051] In the technical solution of this utility model, firstly, the feeding component 1 transports the grain to the inlet. The grain enters the moisture grading component 2 from the inlet. At this time, the first moisture detection structure can detect the moisture content of the grain. According to the different moisture contents of the grain, multiple grading structures can group the grain. The grouped grain is then transported from the corresponding outlet to multiple drying components 3 through different grouping structures. Since the drying temperature of any two drying components 3 differs, each drying component 3 can perform targeted drying work on grain with a corresponding moisture content, thereby ensuring that grain with different moisture contents can achieve a good drying effect and guaranteeing the uniformity of grain drying. This configuration, by performing targeted drying on grain with different moisture contents, can guarantee the drying effect and drying uniformity, thereby improving energy utilization efficiency, reducing resource waste, and improving the sustainable development capability of the drying tower 100.

[0052] It should be noted that this utility model does not limit the grading order of the multiple grading structures in terms of grain moisture content from top to bottom. In one embodiment of this utility model, the multiple grading structures grade and transport the grain from top to bottom in order of decreasing moisture content; in another embodiment of this utility model, the multiple grading structures grade and transport the grain from top to bottom in order of increasing moisture content.

[0053] Specifically, in actual settings, the appropriate option can be selected according to the requirements; this utility model does not impose any restrictions on this.

[0054] In this embodiment, multiple grading structures are used to grade and transport grain from top to bottom in order of increasing moisture content.

[0055] Similarly, this invention does not limit the specific number of the hierarchical structures. In one embodiment, the number of hierarchical structures can be set to three; in another embodiment, the number of hierarchical structures can be set to four; and in yet another embodiment, the number of hierarchical structures can be set to two. Specifically, the number can be selected according to actual needs.

[0056] In this embodiment, the number of hierarchical structures is set to two.

[0057] Of course, this utility model does not limit the specific structural form of the hierarchical structure; please refer to [link / reference]. Figure 3 In one embodiment of the present invention, the plurality of grading structures include a first grading structure 21, the first grading structure 21 including a first rotating shaft 211 and a first grading plate 212. The first rotating shaft 211 extends horizontally and is disposed below the feed inlet, and is rotatably disposed along the horizontally extending axis. The first grading plate 212 is disposed on the first rotating shaft 211 to rotate synchronously with the first rotating shaft 211. The grading plate is spirally disposed horizontally. The plurality of discharge ports include a first discharge port, which is located on the horizontally upward side of the grading plate. With this configuration, when the first moisture detection structure detects that the moisture content of the grain at the feed inlet is low, the grain with low moisture content will enter the first grading structure 21. At this time, the first rotating shaft 211 rotates along the horizontally extending axis, and at the same time drives the first grading plate 212 to rotate along the horizontally extending axis. Since the first grading plate 212 is spirally arranged in the horizontal direction, during the rotation of the first grading plate 212, the grain with low moisture content will be driven by the first grading plate 212 to move horizontally until the grain with low moisture content is transported from the first discharge port to the corresponding drying component 3 for targeted drying.

[0058] It should be noted that, in another embodiment of this utility model, in order to ensure that grains with low moisture content can be smoothly conveyed from the first discharge port to the corresponding drying component 3, the first grading structure 21 further includes a first discharge channel, which connects the first discharge port to one of the drying components 3. This ensures the conveying of grains with low moisture content.

[0059] Furthermore, since the first grading plate 212 is spirally arranged in the horizontal direction, its lower part is open to allow grains with higher moisture content to pass through. To prevent grains with lower moisture content from entering other grading structures from the open end of the first grading plate 212, thus causing grading failure, in a further embodiment of this utility model, the plurality of discharge ports include a second discharge port located below the first rotating shaft 211. The plurality of grading structures include a second grading structure 22, which includes a second rotating shaft 221 and a second grading plate 222. The second rotating shaft 221 extends horizontally and is located below the second discharge port. The second rotating shaft 221 is rotatably arranged along its horizontally extending axis. The second grading plate 222 is located on the second rotating shaft 221 and rotates synchronously with it. During the rotation stroke of the second grading plate 222, the second grading plate 222 has a blocked state of blocking the second discharge port and an open state of opening the second discharge port. With this configuration, when the first moisture detection structure detects that the grain at the feed inlet has low moisture content, the second rotating shaft 221 rotates along the horizontally extending axis to drive the second grading plate 222 to rotate synchronously along the horizontally extending axis, and switches to the blocking state to block the second discharge port, so that the grain with low moisture content can be completely retained at the first grading structure 21, thereby performing graded conveying and ensuring the smooth progress of targeted drying work.

[0060] When the first moisture detection structure detects that the grain at the feed inlet has a high moisture content, the second rotating shaft 221 rotates along the horizontally extending axis to drive the first grading plate 212 to rotate synchronously along the horizontally extending axis, so that the second grading plate 222 switches from the blocked state to the open state. At this time, the grain with a high moisture content can enter the second discharge port, and then enter the corresponding drying component 3 from the second discharge port for drying, ensuring the smooth progress of the targeted drying work.

[0061] Similarly, in another embodiment of this utility model, to ensure that grains with high moisture content can be smoothly conveyed from the second discharge port to the corresponding drying component 3, the second grading structure 22 further includes a second discharge channel, which connects the second discharge port to another drying component 3. This ensures the conveying of grains with high moisture content.

[0062] Furthermore, this utility model does not limit the specific structural form of each of the drying components 3. In one embodiment of this utility model, each of the drying components 3 includes a preheating chamber 31, a drying chamber 32, and a discharge chamber 33. The preheating chamber 31 is provided corresponding to one of the discharge ports. The upper end of the preheating chamber 31 is connected to the outside. The drying chamber 32 is located below the preheating chamber 31 and is connected to the preheating chamber 31. The drying chamber 32 is used to dry grain. The discharge chamber 33 is located below the drying chamber 32 and is connected to the drying chamber 32. The discharge chamber 33 is used to output the dried grain. It is understandable that, since the preheating chamber 31 is connected to the drying chamber 32 and the outside, the temperature of the preheating chamber 31 is between the temperature of the drying chamber 32 and the outside temperature. When the grain enters the corresponding drying component 3 for drying, it first enters the preheating chamber 31. The preheating chamber 31 can preheat the grain to create a relatively low-temperature tempering environment for the grain, thereby balancing the internal temperature and horizontal distribution of the grain particles, reducing the thermal stress of the grain particles, reducing the probability of grain bursting, and thus improving the overall drying efficiency and drying quality of the drying tower 100. Then, the grain enters the drying chamber 32 for formal drying. After drying, the grain enters the discharge chamber 33 for output.

[0063] In a further embodiment of this utility model, in order to ensure the structural strength of the preheating chamber 31 and to prevent the preheating chamber 31 from deforming due to grain accumulation, which would cause problems in the preheating of the grain, multiple reinforcing ribs are provided at horizontal intervals on the side wall of the preheating chamber 31. Each reinforcing rib extends vertically to enhance the structural strength of the preheating chamber 31 and reduce the mass change of the preheating chamber 31.

[0064] To ensure that the grain is fully dried within the drying chamber 32 and to prevent uneven drying within the same chamber, please refer to [link to relevant documentation]. Figure 4In one embodiment of this utility model, the drying chamber 32 includes a chamber body and multiple screening groups. The screening groups are spaced vertically within the chamber body. Each screening group includes multiple screening structures 34 spaced horizontally. Each screening structure 34 is connected at both ends to opposite horizontal side walls of the chamber body. The screening structures 34 of adjacent screening groups are staggered horizontally. With this arrangement, when grain enters the chamber for drying, it first moves to the screening structures 34 of the uppermost screening group, where it is screened. Then, it moves to the screening structures 34 of the next screening group for further screening. This process is repeated multiple times, allowing for multiple screenings of the grain. This ensures the grain is dispersed and moves downwards evenly as the screening structures 34 are arranged, resulting in sufficient dispersion within the chamber and guaranteeing drying quality and uniformity.

[0065] Meanwhile, the arrangement of multiple screening structures 34 can also change the specific running direction of the grain during its downward movement and extend the path of the grain within the storage chamber, thereby increasing the heating time of the grain and making it more conducive to drying moisture.

[0066] It should be noted that this utility model does not limit the specific structural form of the sieving structure 34. For example, in one embodiment of this utility model, each sieving structure 34 includes two sieving plates 341 arranged horizontally at intervals. The upper end of each sieving plate 341 is bent toward the other sieving plate 341 to connect to it. This arrangement is simple in structure and easy to install. At the same time, when the grain moves downward, it will move downward along the bent section of the two sieving plates 341 to ensure the dispersion and uniformity of the grain within the storage chamber.

[0067] In another embodiment of this utility model, each of the screening structures 34 includes a U-shaped plate, which is curved upwards. This arrangement also ensures that when the grain moves downwards, it can move downwards along the curved portion of the U-shaped plate, thereby ensuring the dispersion and uniformity of the grain within the storage chamber.

[0068] Of course, in other embodiments of this utility model, the sieving structure 34 can also be configured in other structural forms, and can be selected according to the requirements when actually setting it.

[0069] It should also be noted that this utility model does not limit the specific drying form of the drying chamber 32. In one embodiment of this utility model, multiple electric heating wires are provided in the chamber to dry the grain in the chamber by means of electric heating.

[0070] In another embodiment of the present invention, the chamber body is provided with a plurality of ventilation holes 35 on both horizontally opposite side walls. The plurality of ventilation holes 35 on the same side wall are respectively provided for a plurality of sieving structures 34 and are located below the corresponding sieving structures 34. The drying chamber 32 also includes a hot air structure 4. The hot air structure 4 is provided for one side wall of the chamber body and communicates with the plurality of ventilation holes 35 on the side wall to blow hot air into the corresponding plurality of ventilation holes 35. With this configuration, when the hot air structure 4 blows hot air into the chamber, the hot air enters the chamber through multiple vents 35 on one side wall of the chamber. During the blowing process, it bypasses the side wall of the sieving structure 34 and flows upward to fully contact the grain between the two adjacent sieving structures 34 above, ensuring uniform heating of the grain and enhancing heat transfer during the drying process. Simultaneously, some airflow flows downward along the side wall of the sieving structure 34 to contact the grain on the sieving structure 34 below, again ensuring uniform heating of the grain and enhancing heat transfer during the drying process. The counter-current mixing drying process formed by the two airflows in different directions ensures both drying efficiency and drying quality of the grain.

[0071] Of course, it is understandable that there are standard requirements for the moisture content of the grain transported into the grain warehouse. Therefore, before the grain is transported into the grain warehouse, it is necessary to test the moisture content of the dried grain. Grain with qualified moisture content can be transported into the grain warehouse, while grain with unqualified moisture content needs to be dried again. Therefore, in one embodiment of this utility model, the drying tower 100 also includes multiple circulation components 5, each circulation component 5 corresponding to a drying component 3. Each circulation component 5 includes a second moisture detection structure and a circulation lifting structure. The second moisture detection structure is located in the discharge hopper 33 and is used to detect the moisture content of the grain in the discharge hopper 33. The circulation lifting structure is connected to the preheating hopper 31 and the discharge hopper 33. When the moisture content of the grain in the discharge hopper 33 does not meet the standard, the circulation lifting structure is used to lift and transport the grain in the discharge hopper 33 to the preheating hopper 31 for re-drying. With this configuration, when the grain is dried and enters the discharge hopper 33, the second moisture detection structure detects the moisture content of the grain in the discharge hopper 33. If the moisture content of the grain in the discharge hopper 33 meets the standard, the circulating lifting structure does not work, and the grain in the discharge hopper 33 is transported to the grain silo for storage. If the moisture content of the grain in the discharge hopper 33 does not meet the standard, the circulating lifting structure works to lift and transport the grain in the discharge hopper 33 to the preheating hopper 31 for re-drying, thereby further reducing the moisture content of the grain in the discharge hopper 33 until the moisture content of the grain in the discharge hopper meets the standard.

[0072] Similarly, to ensure the grain conveying capacity of the feeding assembly 1, in one embodiment of this utility model, the feeding assembly 1 includes a feeding structure 11, a feeding lifting structure 12, and a discharging structure 13. The feeding structure 11 receives incoming material, the feeding lifting structure 12 extends vertically, and its lower end is connected to the feeding structure 11. The feeding lifting structure 12 is used to lift and transport the grain from the feeding structure 11 upwards. The discharging structure 13 is located above the feeding structure 11 and connected to the upper end of the feeding lifting structure 12. The discharging structure 13 is used to discharge the grain transported by the feeding lifting structure 12 to the feeding inlet. With this configuration, the feeding lifting structure 12 can lift the grain from the feeding structure 11 to the discharging structure 13 from bottom to top, making feeding convenient and saving manpower.

[0073] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A drying column, characterized in that The application relates to a grain drying device. The device comprises: a feeding assembly for feeding grain; a moisture grading assembly having a feeding port and a plurality of discharging ports arranged in a vertical direction, the moisture grading assembly comprising a first moisture detection structure arranged corresponding to the feeding port for detecting the moisture content of the grain at the feeding port, and a plurality of grading structures arranged below the first moisture detection structure and corresponding to the discharging ports respectively, the grading structures being used for grading and feeding the grain to the corresponding discharging ports according to the moisture content of the grain; and a plurality of drying assemblies arranged in a vertical direction, each of the drying assemblies corresponding to one of the discharging ports, the drying assemblies being used for drying the grain with different moisture contents respectively.

2. The drying column of claim 1 wherein, The drying temperatures of any two of the drying assemblies are arranged in a vertical direction. The grading structures comprise a first grading structure, which comprises: a first rotating shaft arranged below the feeding port in a horizontal direction and rotating along an axis extending in the horizontal direction; and a first grading plate arranged on the first rotating shaft and rotating synchronously with the first rotating shaft, the grading plate being arranged in a spiral shape in the horizontal direction.

3. The drying column of claim 2, wherein The discharging ports comprise a first discharging port located on one side of the grading plate in the horizontal direction. The discharging ports comprise a second discharging port arranged below the first rotating shaft. The grading structures comprise a second grading structure, which comprises: a second rotating shaft arranged below the second discharging port in a horizontal direction, the second rotating shaft rotating along an axis extending in the horizontal direction; and 4. The drying column of claim 3 wherein, a second grading plate arranged on the second rotating shaft and rotating synchronously with the second rotating shaft, the second grading plate having a closed state for closing the second discharging port and an open state for opening the second discharging port in a rotating stroke of the second grading plate. The first grading structure further comprises a first discharging channel connecting the first discharging port and one of the drying assemblies; and / or 5. The drying column of claim 1 wherein, The second grading structure further comprises a second discharging channel connecting the second discharging port and another of the drying assemblies. Each of the drying assemblies comprises: a preheating bin arranged corresponding to one of the discharging ports, the upper end of the preheating bin being connected to the outside; a drying bin arranged below the preheating bin and connected to the preheating bin, the drying bin being used for drying the grain; and 6. The drying column of claim 5 wherein, a discharging bin arranged below the drying bin and connected to the drying bin, the discharging bin being used for outputting the dried grain. The drying bin comprises: a bin body; and a plurality of screen groups arranged in a vertical direction in the bin body, each of the screen groups comprising a plurality of screen structures arranged in a horizontal direction, the two ends of each of the screen structures in the horizontal direction being connected to the two opposite side walls of the bin body in the horizontal direction, and the screen structures of adjacent two of the screen groups being arranged in a staggered manner in the horizontal direction.

7. The drying column of claim 6 wherein, Each of the screen structures comprises two screen plates arranged in horizontal direction, and upper ends of each of the screen plates are arranged in a direction of the other screen plate to connect the other screen plate.

8. The drying column of claim 6 wherein, The bin body is provided with a plurality of air holes in the opposite side walls in horizontal direction, and the air holes in the same side wall correspond to the screen structures and are arranged below the screen structures. The drying bin further comprises a hot air structure corresponding to one of the side walls of the bin body and connected to the air holes in the side wall to blow hot air into the air holes.

9. The drying column of claim 5 wherein, The drying tower further comprises a plurality of circulating assemblies, each of which corresponds to one of the drying assemblies, and each of the circulating assemblies comprises: a second moisture detection structure arranged in the discharge bin to detect the moisture content of the grain in the discharge bin; and a circulating lifting structure arranged in communication with the preheating bin and the discharge bin to transport the grain in the discharge bin to the preheating bin for re-drying when the moisture content of the grain in the discharge bin does not meet the standard.

10. The drying column of claim 1 wherein, The feeding assembly comprises: a feeding structure to receive incoming grain; a feeding lifting structure extending in vertical direction, a lower end of the feeding lifting structure connected to the feeding structure, the feeding lifting structure to transport the grain in the feeding structure upwardly; and a discharging structure arranged above the feeding structure and connected to an upper end of the feeding lifting structure, the discharging structure to discharge the grain transported by the feeding lifting structure to the feeding port.

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