Multi-pass box-type grain dehumidifying drying device

Abstract

The application discloses a multi-channel box type grain dehumidifying and drying device, which comprises a box body, interval arranged air inlet and outlet air collecting hoods are distributed on both sides of the box body, a variable frequency axial flow fan, dust removal horizontal and vertical pipes, a cyclone dust collector and a dust removal dust collecting hood are arranged on the air inlet air collecting hood, a plurality of feeding ports are distributed on the upper part of the box body, at least one gap type buffer bin of a combined unit is arranged in the box body below each feeding port, and the variable frequency axial flow fan and the dust removal horizontal and vertical pipes are corresponded; the box body is integrally installed on a chassis; a plurality of inclined grain flow channels are arranged at the lower end of the chassis and correspond to the elevator hopper and the screw elevators, each screw elevator corresponds to the feeding port; a circulating conveying belt machine is arranged on the chassis below the inclined grain flow channel. The grain passes through the gap type buffer bin of each unit, 360-degree ventilation efficiency is achieved, and the secondary humid heat accumulation effect problem of the prior art that one end is close to heat and far from humidity is avoided.

Description

Technical Field

[0001] This invention relates to the field of grain dehumidification and drying, specifically a multi-channel box-type grain dehumidification and drying device. Background Technology

[0002] Grain dehumidification and drying are two distinct processes, differing primarily in the object being treated, the objective, and the method. Grain dehumidification aims to reduce the moisture content of grains, preventing mold and sprouting, and extending their shelf life. This process typically occurs at room temperature, requiring no heating and relying mainly on natural methods such as ventilation and sun drying. Grain drying, on the other hand, involves rapidly evaporating moisture from the grains through heating and ventilation to reduce their moisture content. Existing tower dryers typically employ a cross-flow or counter-flow hot air circulation design, with the chamber's volume and height proportioned in a length-width-height ratio, emphasizing a large-capacity grain silo structure. The ventilation and exhaust within the tower dryer's grain silo are often multi-layered, using corner boxes, relying on external fuel heat conduction and convection to directly heat the grain surface with high-temperature hot air, rapidly removing moisture. This is its advantage, making it more suitable for existing large and medium-sized grain drying enterprises. Because hot air flows in the same direction (through-flow) or opposite direction (counter-flow) to grain particles, the structure of large-volume grain silos has poor hot air penetration during grain drying. The delayed heat exchange per unit time prevents the instantaneous removal of moisture from the grain, resulting in a secondary heat and moisture accumulation effect at one end (hot near the grain, moist far away). Furthermore, using hot air circulation for grain drying results in a high specific energy consumption for the heat source system. Currently, there is limited research and discussion on the technology of natural cold air low-temperature dehumidification drying equipment for grains. Grain dehumidification mainly involves reducing the temperature and humidity of the environment in which the grains are located, promoting the diffusion of moisture from the grains to the lower humidity environment. The difference in the internal moisture content of the grains is the driving force for moisture diffusion. When the ambient temperature and relative humidity are constant, wind speed is the main factor determining the rate of free water separation in the grains. Lowering the ambient temperature and humidity through forced ventilation and increasing the airflow speed can significantly promote the evaporation of free water. Therefore, grain dehumidification drying equipment that incorporates a small amount of auxiliary heat source to reduce the specific energy consumption of hot air is one of the important steps in effectively utilizing natural cold air resources and incorporating a small amount of auxiliary heat source to solve the problem of low-temperature dehumidification drying of grains. Summary of the Invention

[0003] To address the aforementioned problems, this invention provides a multi-channel box-type grain dehumidification and drying device. By using a separate slotted box frame structure and adding a slotted pressurization pipe, the high-pressure airflow can achieve 360-degree ventilation efficiency. When the variable frequency axial flow fan is running, the natural cold and hot high-pressure airflow source instantly passes through the slotted box and generates a reverse high-pressure airflow around the inside of the slotted pressurization pipe, thereby enhancing the rapid separation and extraction of free water from the grain inside each individual slotted box for dehumidification and drying.

[0004] The technical solution of this invention is: a multi-channel box-type grain dehumidification and drying device, wherein: The enclosure includes a housing with inlet and outlet air collection hoods distributed on both sides. A variable frequency axial flow fan is installed on one side of the inlet air collection hood, and horizontal and vertical dust collection pipes are installed on the other side of the outlet air collection hood. Cyclone dust collectors and dust collection hoods are installed on the horizontal and vertical dust collection pipes, respectively. Multiple feeding ports are located at the top of the housing. At least one row of combined unit slotted buffer hoppers is set inside the housing below each feeding port. The two ends of each slotted buffer hopper correspond to the variable frequency axial flow fan and the horizontal and vertical dust collection pipes set in the housing, respectively. The entire housing is mounted on a base frame. The lower end of the base frame is provided with multiple inclined grain troughs. Each grain trough is located at the lower end of each row of slotted bulk silos. Each inclined grain trough corresponds to a hoist hopper. Each hoist hopper is equipped with a screw elevator corresponding to the feeding port. A circulating conveyor belt and corresponding side feed hoppers and side leakage hoppers are provided on the base frame below the grain trough.

[0005] The aforementioned slotted buffer chamber comprises symmetrical longitudinal slotted buffer chamber plates, which are connected by transverse slotted ventilation plates at both ends of the longitudinal slotted buffer chamber plates. Multiple mounting holes are provided on the transverse slotted ventilation plates, and a slotted pressurization pipe is installed in each mounting hole.

[0006] Furthermore, the slotted booster pipe has slots distributed radially throughout, and one side of the slotted booster pipe is provided with a variable diameter baffle; the two sides of the slotted booster pipe are provided with grooves radially and retaining springs installed in the grooves.

[0007] Furthermore, the slotted booster pipes are arranged in a diamond pattern on the transverse slotted ventilation plate.

[0008] Furthermore, the air inlet / outlet flange interface is located on the raised air inlet / outlet hood.

[0009] Furthermore, a distribution plate with sides inclined is provided below the feeding hopper so that the distributed grains are evenly distributed in the slotted buffer bin for step-by-step dehumidification treatment.

[0010] As described above, the rotary screw conveyor has two rotation positions, A and B. When the rotary screw conveyor rotates to position A, the dehumidified grain is transported to the ground for processing. When drying is required, the rotary screw conveyor rotates to position B, and the dehumidified grain is transported to a circulating conveyor belt, so that the grain is fed back into the slotted buffer silo through multiple screw conveyors for drying.

[0011] The aforementioned circulating conveyor belt is a variable frequency speed-regulating oil-cooled electric roller conveyor manufactured by Shandong Zibo Hengzi Machinery Co., Ltd., model number: BWD-3.0KW-(0.3-1.25)-650-320.

[0012] The beneficial effects of this invention are: grains are conveyed step-by-step into multiple slotted buffer silos for dehumidification, effectively improving dehumidification effect and efficiency. Simultaneously, the dehumidified grains can be returned to the circulating conveyor belt and then transported through a multi-stage elevator to multiple slotted buffer silos for drying. Therefore, this invention can perform dehumidification or drying according to the different moisture content requirements of grains. It can be configured into large, medium, and small fixed batch circulating dehumidification and drying units. Furthermore, the use of a separate slotted box-frame structure, through the added slotted pressurization pipe, allows for 360-degree ventilation, eliminating the secondary heat and moisture accumulation effect of existing technologies where heat is concentrated near one end and moisture is concentrated at the other. To enhance the high-pressure airflow inside the slotted pressurization pipe, a baffle structure is adopted at one end. When the variable frequency axial flow fan of the air inlet hood on the sealed housing is running, the natural cold and hot high-pressure airflow source instantly passes through the slotted housing and generates a reverse high-pressure airflow around the inside of the slotted pressurization pipe. This enhances the rapid separation and removal of free water from the grain inside each individual slotted housing for dehumidification and drying. Multiple sealed housings connected in series laterally can form large, medium, and small fixed batch circulating dehumidification and drying units. Attached Figure Description

[0013] Figure 1 is a schematic diagram of the present invention; Figure 2 is the left view of Figure 1; Figure 3 is the right view of Figure 1; Figure 4 is a top view of Figure 1; Figure 5 is a rear view of Figure 1; Figure 6 is a top view of the frame in Figure 1; Figure 7 is a view of the slotted buffer chamber in Figure 1; Figure 8 This is the left view of Figure 7; Figure 9 This is the top view of Figure 7; Figure 10 This is a view of the horizontal fish-scale ventilation panel in Figure 7; Figure 11 yes Figure 10 Left view; Figure 12 yes Figure 10 Top view; Figure 13 This is a longitudinal view of the slotted ventilation panel in Figure 7; Figure 14 yes Figure 13 Left view of a longitudinal slotted ventilation panel; Figure 15 yes Figure 13 Top view of a longitudinal slotted ventilation panel; Figure 16 yes Figure 1 View of a slotted booster pipe; Figure 17 yes Figure 16 Right view; Figure 18 This is a view of the snap ring.

[0014] In the diagram: 1. Frame; 2. Housing; 3. Side feed hopper; 4. First screw conveyor; 5. Feed inlet; 6. Second screw conveyor; 7. Grain diverter plate; 8. Third screw conveyor; 9. Rotary screw conveyor; 10. Slotted buffer hopper; 11. Power distribution system box; 12. Side discharge hopper; 13. Inclined grain trough; 14. Circulating conveyor belt; 15. Inlet and outlet air collection hood; 16. Inlet flange interface; 17. Reserved hole; 18. Variable frequency axial flow fan; 19. Elevator hopper; 20. Dust collection hood; 21. Cyclone dust collector; 22. Dust collection vertical pipe; 23. Outlet flange interface; 24. Dust collection horizontal pipe; 25. Longitudinal slotted ventilation plate; 26. Slotted pressurization pipe; 27. Transverse fish scale ventilation plate; 28. Snap ring groove; 29. ​​Variable diameter hole baffle; 30. Open snap ring. Detailed Implementation

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] See Figure 1 to Figure 18 The multi-channel box-type grain dehumidification and drying device shown includes a rectangular box 2. Air inlet and outlet hoods 15 are distributed on both sides of the box 2 (the air inlet and outlet hoods are of the same structure, hence they are designated by the same symbol 15). Three feeding ports 5 are provided at the upper end of the box 2, and a grain diversion plate 7 is fixedly installed inside the box 2 corresponding to the lower end of each feeding port 5. In this way, the grain entering through the feeding ports 5 is evenly distributed to both sides by the grain diversion plate 7, facilitating the grain's entry into the gap-type buffer chamber 10 for dehumidification.

[0017] In this invention, each feeding port 5 corresponds to three independent unit cavities spaced apart inside the housing 2. A slotted buffer chamber 10 is installed within each of the three independent unit cavities. The slotted buffer chamber 10 in this embodiment includes horizontally arranged fish-scale ventilation plates 27 symmetrically spaced at certain intervals, and longitudinally arranged slotted ventilation plates 25 (with flanges on all four sides) symmetrically arranged at both ends of the horizontally arranged fish-scale ventilation plates 27. A rectangular frame is formed by bolts connecting the mounting holes (not shown in the figure) on the flanges of the longitudinally arranged slotted ventilation plates 25 to the mounting holes on the horizontally arranged fish-scale ventilation plates 27. Four slotted pressure boosting pipes 26 are installed in four diamond-shaped mounting holes in the middle of the longitudinally arranged slotted ventilation plates 25, forming an independent slotted buffer chamber 10. In this embodiment, the horizontally arranged fish-scale ventilation plates 27 are composed of two horizontally arranged fish-scale ventilation plates 27 connected and fixed at the middle.

[0018] The aforementioned transverse fish-scale ventilation panels 27 have outward-flared structures at both ends, with mounting holes distributed on them. When installed vertically, they are fixed together by bolts. Similarly, the four ends of the longitudinal slotted ventilation panels 25 all have outward-flared structures, facilitating the bolt-fixed connection between the mounting holes distributed on the transverse outward-flared structures and the corresponding mounting holes of the transverse fish-scale ventilation panels 27. To ensure the installation stability of the slotted booster pipe 26, radial spring clips 28 are provided at both ends of the slotted booster pipe 26, and open spring clips 30 on the spring clip clips 28 are used for fixing and limiting. One end of the slotted booster pipe 26 has a variable-diameter baffle 29. When installed with the longitudinal slotted ventilation panels 25, the end with the variable-diameter baffle 29 corresponds to the position of the side air outlet hood 15 of the housing 2. The slotted booster pipe 26, which is beneficial to the variable diameter baffle plate 29, is used to increase the air pressure inside the slotted booster pipe 26 and to better dehumidify.

[0019] In the above-mentioned configuration, an air inlet flange interface 16 is installed on the air inlet hood 15 on one side of the upper, middle and lower combination arrangement of the slotted buffer chamber 10 located inside the housing 2. A variable frequency axial flow fan 18 is installed on the air inlet flange interface 16. Similarly, an air outlet flange interface 23 is installed on the air outlet hood 15 on the other side of the housing 2. A horizontal dust removal pipe 24 and a vertical dust removal pipe 22 that are interconnected are installed on the air outlet flange interface 23. A cyclone dust collector 21 is installed at the outlet end of the horizontal dust removal pipe 24, and a dust collection hood 20 is installed at the lower end of the vertical dust removal pipe 22.

[0020] In the above, the air inlet flange interface 16 is set at the top, middle and bottom positions, so that the variable frequency axial flow fan 18 installed on it corresponds to the air inlet side of a slotted buffer chamber 10. The variable frequency axial flow fan 18 provides air to the slotted pressure pipe 26 in the slotted buffer chamber 10 for dehumidification of the grain.

[0021] In this invention, when the slotted buffer compartment 10 assembled in each independent unit cavity is installed with the housing 2, it is advantageous for the bottom edges of the bottom two sides of the lowest slotted buffer compartment 10 to be installed at the bottom of the housing 2, so that the mounting holes on both sides of the slotted buffer compartment 10 are connected by bolts to form a whole and fixedly installed on the base frame 1.

[0022] In this invention, each slotted buffer compartment 10 located in the independent unit cavity of the housing 2 is respectively provided with an inclined grain flow channel 13 below the frame 1. Gap holes (not shown in the figure) are locally distributed at the inclined position of the grain flow channel 13 to filter out impurities.

[0023] In this embodiment, the grain trough 13 has upwardly bent baffles on both sides to prevent grain from falling off during the conveying process to each elevator hopper 19. Each inclined grain trough 13 has a corresponding elevator hopper 19 at its lower end, and a second spiral elevator 6, a third spiral elevator 8, and a rotary spiral elevator 9 are located within the elevator hopper 19. The first spiral elevator 4 is installed inside the side feed hopper 3, which is located on one side of the housing 2. The first spiral elevator 4, second spiral elevator 6, and third spiral elevator 8 are respectively connected to their respective feed inlets 5 via inclined chutes. The chute on the rotary screw conveyor 9 corresponds to the side hopper 12, or the rotary screw conveyor 9 rotates away from the side hopper 12, causing the chute on it to be relative to the ground, so that the grain is discharged onto the ground. The side hopper 12 mentioned above is located on the other side of the housing 2.

[0024] In this embodiment, the side hopper 12 is an empty hopper without a bottom plate, and the circulating conveyor belt 14 is located below it. When the rotary screw conveyor 9 rotates towards the side hopper 12, the chute on it synchronously corresponds to the side hopper 12 and feeds grain into the side hopper 12, which falls onto the circulating conveyor belt 14. The circulating conveyor belt 14 then transports the grain to the side hopper 3 located at one end of the circulating conveyor belt 14, and then feeds the grain back to the feeding port 5 via the first screw conveyor 4. Grain is then fed into the slotted buffer bin 10 in sequence through the first screw conveyor 4, the second screw conveyor 6, and the third screw conveyor 8 for multi-stage dehumidification or drying treatment.

[0025] In this embodiment, a circulating conveyor belt 14 is horizontally installed on the base frame 1 located below the inclined grain trough 13. The circulating conveyor belt 14 is connected to the base frame 1 via the central shafts of the active and passive rollers at both ends. The function of the circulating conveyor belt 14 is to repeatedly transport grain to the side feed hopper 3 during grain drying.

[0026] In the above description, the side feed hopper 3 and the three elevator hoppers 19 (since the second spiral elevator 6, the third spiral elevator 8, and the rotary spiral elevator 9 are respectively installed in three elevator hoppers with the same structure, the three elevator hoppers are represented by only one label 19) are respectively positioned to correspond to the first spiral elevator 4, the second spiral elevator 6, and the third spiral elevator 8, which respectively connect to the three feeding ports 5 on the upper part of the housing 2 via chutes, and feed grain into the feeding ports 5. In this way, when the variable frequency axial flow fan 18 is working, it sends air to the slotted pressurization pipe 26, and the air enters the slotted buffer bin 10 through the gaps in the slotted pressurization pipe 26 to perform primary uniform air supply and dehumidification on the grain, and then performs secondary and tertiary dehumidification treatment according to the aforementioned steps.

[0027] The function of the rotary screw conveyor 9 in this embodiment is as follows: The rotary screw conveyor 9 has two rotation positions, A and B. When the rotary screw conveyor 9 rotates to position A, it conveys the dehumidified grain to the ground for processing. When drying is required, the rotary screw conveyor 9 rotates to position B, conveys the dehumidified grain to the circulating conveyor belt 14, and then returns the grain to the first screw conveyor 4, the second screw conveyor 6, and the third screw conveyor 8 in sequence for multiple drying processes in the slotted bulk silo 10.

[0028] In the above, the slotted booster pipe 26 has slots distributed throughout.

[0029] Furthermore, the air inlet flange interface 16 is provided with a reserved hole 17 for connecting the auxiliary heat source hot pipe. According to the actual working conditions, the auxiliary heat source heats the hot air to quickly dehumidify and dry the grain, so as to achieve effective utilization of heat energy.

[0030] In this invention, the power supply systems for the first spiral elevator 4, the second spiral elevator 6, the third spiral elevator 8, the rotary spiral elevator 9, and the circulating conveyor belt 14 are supplied by the power distribution system 11.

[0031] The first spiral elevator 4, the second spiral elevator 6, the third spiral elevator 8, and the rotary spiral elevator 9 mentioned above are drum-type spiral elevators, and their discharge ends are all equipped with material conveying chutes.

[0032] As described above, the air inlet and outlet hood 15 facilitates the airflow from the variable frequency axial flow fan 18 to the upper, middle and lower arranged slotted buffer chamber 10, which is guided by the air inlet and outlet hood 15 to enter the slotted pressurization pipe 26 when the air is delivered by the variable frequency axial flow fan 18, and diffuses the air to the grain in the slotted buffer chamber 10 for dehumidification.

[0033] Furthermore, the air inlet and outlet hood 15 is an independent hood, and multiple air inlet and outlet hoods 15 are installed on the frame on both sides of the housing 2 and fixed to both sides of the housing 2 with screws.

[0034] Specific dehumidification steps: 1. When rapidly dehumidifying newly harvested grains.

[0035] Multiple variable frequency axial flow fans 18 are activated. Grain is lifted by the first screw conveyor 4 and fed into the feeding port 5. It is then evenly distributed into the slotted buffer silo 10 of the first unit via a diverter plate. After initial dehumidification in the slotted buffer silo 10, the grain falls freely into the inclined grain chute 13 and flows into the elevator collection hopper 19. Following the same steps, the second screw conveyor 6 and the third screw conveyor 8 sequentially feed grain into the slotted buffer silos 10 of the second and third units, respectively, and then into the elevator collection hopper 19 via the inclined grain chute 13. The grain, having completed three stages of dehumidification, is then rotated by the rotary screw conveyor 9, causing its conveying chute to discharge directly onto the ground. This method achieves the requirements for rapid turning, drying, cooling, and dehumidification of newly harvested grain. This method is suitable for rapid turning, drying, and dehumidification of newly harvested grain in fields, small drying yards, and large and medium-sized farmyards, reducing losses due to mold and germination. By setting the first spiral elevator 4, the second spiral elevator 6, and the third spiral elevator 8 to different motor speeds, the flow rate and velocity of the grain falling into the slotted buffer silo 10 can be controlled. By adjusting the different speeds of each variable frequency axial flow fan 18, the air pressure and air velocity in each unit's slotted buffer silo 10 can be regulated and controlled. Natural cold or hot air, or auxiliary heat source hot air, is introduced into each unit's slotted buffer silo 10 through the reserved holes 17 to quickly cool and dehumidify the grain, thereby achieving effective utilization of heat energy.

[0036] 2. During batch dehumidification and drying operation.

[0037] Based on the grain temperature, humidity, set air pressure, air velocity, and auxiliary heat source intervention, a closed-loop dehumidification and drying process is completed. When the rotary screw conveyor 9 conveys grain to the side hopper 12 and onto the running circulating conveyor belt 14, it is then conveyed to the side feed hopper 3, and sequentially lifted by the first screw conveyor 4, the second screw conveyor 6, and the third screw conveyor 8 into three slotted buffer silos 10, repeating the above process. The flow rate, velocity, air pressure, air velocity, temperature, and humidity of the grain falling through the slotted buffer silos 10 are controlled by the power distribution system 11. After the grain batches are dehumidified and dried to the required standard, they are discharged by the rotary screw conveyor 9. This method is suitable for small drying yards, large and medium-sized yards, and drying enterprises for dehumidifying and drying new batches of grain.

[0038] 3. The exhaust gas and dust generated during the dehumidification process pass through the longitudinal slotted ventilation plate 25 and the transverse fish-scale ventilation plate 27, and are discharged together to the cyclone dust collector 21 through the dust removal vertical pipe 22 and the dust removal horizontal pipe 24. When the inclined grain trough 13 sends the grain to the elevator hopper 19, the dust generated by the grain is removed again by the dust collection hood 20 to complete the dust removal and ventilation process.

[0039] The main characteristics described above are: when grain passes through the slotted buffer chambers 10 of each unit inside the housing 2, 360-degree ventilation is achieved, eliminating the secondary heat and moisture accumulation effect of existing technologies where heat is near one end and moisture is far away. When cold and hot high-pressure air sources instantly penetrate through the slotted buffer chambers 10, a reverse high-pressure airflow is generated around the inside of the slotted pressurization pipe 26. Because the air is compressed by the variable diameter baffle 29 at one end of the slotted pressurization pipe 26, secondary pressurization is generated inside the slotted cyclone pipe 26 while the high-pressure airflow overflows. The high-pressure airflow radiates to the surroundings and passes through the grain in the slotted buffer chambers 10, quickly separating and removing the free water in the grain to achieve dehumidification and drying.

Claims

1. A multi-channel box-type grain dehumidification and drying device, characterized in that, The enclosure includes a housing with inlet and outlet air collection hoods distributed on both sides. A variable frequency axial flow fan is installed on one side of the inlet air collection hood, and horizontal and vertical dust collection pipes are installed on the other side of the outlet air collection hood. Cyclone dust collectors and dust collection hoods are installed on the horizontal and vertical dust collection pipes, respectively. Multiple feeding ports are located at the top of the housing. At least one row of combined unit slotted buffer chambers is set inside the housing below each feeding port. The two ends of each unit slotted buffer chamber correspond to the variable frequency axial flow fan and the horizontal and vertical dust collection pipes set in the housing, respectively. The entire housing is mounted on a base frame. The lower end of the base frame is provided with multiple inclined grain troughs. Each inclined grain trough is located at the lower end of each row of slotted buffer bins. Each inclined grain trough corresponds to a hoist hopper. Each hoist hopper is equipped with a screw elevator corresponding to the feeding port. A circulating conveyor belt and corresponding side feed hoppers and side leakage hoppers are provided on the base frame below the grain trough.

2. The multi-channel box-type grain dehumidification and drying device according to claim 1, characterized in that, The slotted buffer chamber includes symmetrical horizontal fish-scale ventilation panels, and longitudinal slotted ventilation panels are connected at both ends of the horizontal fish-scale ventilation panels. Multiple mounting holes are provided on the longitudinal slotted ventilation panels, and a slotted pressurization pipe is installed in each mounting hole.

3. The multi-channel box-type grain dehumidification and drying device according to claim 2, characterized in that, The slotted booster pipe has slots distributed radially throughout. One end of the slotted booster pipe has a variable diameter baffle. The two sides of the slotted booster pipe are provided with radial grooves and retaining springs installed in the grooves.

4. The multi-channel box-type grain dehumidification and drying device according to claim 1, characterized in that, The slotted booster pipes are arranged in a diamond pattern on the longitudinal slotted ventilation plate.

5. A multi-channel box-type grain dehumidification and drying device according to claim 2, characterized in that, The air inlet and outlet flange interfaces are located on the raised air inlet and outlet hoods.

6. A multi-channel box-type grain dehumidification and drying device according to claim 1, characterized in that, A grain distribution plate with tilted sides is installed below the feeding hopper so that the distributed grain is evenly distributed in the slotted buffer bin of each unit for step-by-step dehumidification treatment.

7. A multi-channel box-type grain dehumidification and drying device according to claim 1, characterized in that, The rotary screw conveyor has two rotation positions, A and B. When the rotary screw conveyor rotates to position A, the dehumidified grain is transported to the ground for processing. When the rotary screw conveyor rotates to position B, the dehumidified grain is transported to a circulating conveyor belt, so that the grain is fed back into the slotted buffer silo for drying through multiple elevators.

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