Agricultural grain circulation drying device

Abstract

The present invention relates to the technical field of grain drying, and in particular to an agricultural grain circulation drying device, comprising an outer cylinder, a hot air blower is fixedly installed at the bottom of the outer cylinder, a shoveling mechanism and a conveying mechanism, the shoveling mechanism comprising a turntable, the turntable is rotatably connected to the top of the hot air blower, a plurality of shovel-shaped leaves are fixedly connected to the top of the turntable, the shovel-shaped leaves are eccentrically arranged, a plurality of arc plates are fixedly installed on the shovel-shaped leaves, a circular arc groove is arranged on the side of the shovel-shaped leaves away from the shovel blade, and a second nozzle is arranged on the side wall of the shovel-shaped leaves. The present invention gathers grains to a double-layer hollow tube by arranging shovel-shaped leaves, which are conveyed upward by a spiral rod and then fall naturally, thereby realizing continuous grain circulation and effectively avoiding the problem of grain backlog or uneven local drying. The shovel-shaped leaves help to break up the accumulation of grains, and the grains are in contact with the hot air sprayed from the second nozzle, thereby accelerating the transfer of heat and the evaporation of water, and enhancing the drying effect of the grains.

Description

Technical Field

[0001] The invention relates to the technical field of grain drying, and in particular to an agricultural grain circulation drying device. Background Art

[0002] Agricultural grain recycling drying device is a kind of mechanical equipment specially used in the agricultural field to handle grain crop drying. The main function of this device is to quickly, efficiently and safely reduce the moisture content in grain to a level suitable for storage through scientific methods and technical means, thereby extending the storage period of grain and preventing grain mildew and loss.

[0003] The invention patent with publication number CN109122843A discloses an agricultural grain dryer, including a housing, a guide plate and a motor; a circle of guide plates is arranged in the housing around the lower part of the feed inlet, and a deceleration device is arranged below the guide plate, the deceleration device includes a deceleration cylinder, a rubber ring and a deceleration net, and the side wall of the deceleration cylinder is movably connected to the connecting rod, and the end is fixedly connected to the vibration motor. The deceleration cylinder can slow down the falling speed of the grain, form convection with the upward hot air, ensure the drying effect, and improve the drying efficiency; after drying, the bottom plate is lowered to facilitate the discharge of grain, and workers do not need to carry grain for multiple cycles of drying, which reduces the labor intensity of workers.

[0004] Although the above patent has certain advantages, it simply uses the contact between the grain and the hot air when it falls in the reduction cylinder to dry, which is prone to incomplete moisture removal during the drying process and excessive moisture content inside the grain, resulting in mold or corruption during storage. Excessive moisture content will also promote the growth of microorganisms and increase quality risks during grain storage. The grain that enters the reduction cylinder is prone to accumulation on the reduction net. The accumulation of grain will cause different layers of grain to contact different amounts of hot air, resulting in uneven drying, which in turn leads to poor drying effect, thereby making the equipment less practical. Summary of the invention

[0005] The purpose of the present invention is to solve the shortcoming of poor practicability of the equipment existing in the prior art and to propose an agricultural grain circulation drying device.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] An agricultural grain circulation drying device comprises an outer cylinder, a top cover is arranged on the top of the outer cylinder, a support is fixedly installed on the bottom of the outer cylinder, a hot air blower is fixedly installed on the bottom of the outer cylinder, the hot air blower is located at the bottom center of the outer cylinder, and a material inlet and outlet are arranged on the side wall of the outer cylinder, and further comprises:

[0008] A shoveling mechanism, the shoveling mechanism comprises a rotating disk, the rotating disk is rotatably connected to the top of the hot air blower, the top of the rotating disk is flush with the bottom of the inner wall of the outer cylinder, the rotating disk is rotatably connected to the outer cylinder, a plurality of shovel-shaped leaves are fixedly connected to the top of the rotating disk, a plurality of shovel-shaped leaves are distributed in a circular array on the top of the rotating disk, the shovel-shaped leaves are eccentrically arranged, and a plurality of arc plates are fixedly mounted on the shovel-shaped leaves;

[0009] A plurality of holes are provided through the top of the rotating disk, the plurality of holes respectively correspond to the plurality of shovel-shaped leaves and are internally connected, a circular arc groove is provided on the side of the shovel-shaped leaf away from the shovel blade, a second nozzle is provided on the side wall of the shovel-shaped leaf, and the second nozzle is located in the circular arc groove;

[0010] The conveying mechanism comprises a double-layer hollow tube arranged above the turntable, a vertical spiral rod is fixedly connected to the top center of the turntable, and the spiral rod is located in the double-layer hollow tube.

[0011] Preferably, an ultrasonic rod is fixedly installed inside the interlayer of the double-layer hollow tube, the inner layer of the double-layer hollow tube is configured as a mesh-like air-permeable structure, and an electromagnetic coil is disposed inside the outer layer of the double-layer hollow tube.

[0012] Preferably, the bottom of the spiral rod passes through the turntable and is connected to the hot air blower, and the side wall of the central rod of the spiral rod is provided with a vent hole, and the surface of the vent hole is provided with a mesh structure.

[0013] Preferably, it also includes an exhaust mechanism, which includes a cross ventilation pipe fixedly connected to the top of the top cover, the top center of the cross ventilation pipe is fixedly connected to an exhaust pipe, the bottom of the cross ventilation pipe is fixedly connected to a plurality of connecting pipes, the bottom of the connecting pipe is fixedly connected to the top of the double-layer hollow pipe and is connected to the interlayer of the double-layer hollow pipe.

[0014] Preferably, it also includes a dispersion mechanism, which includes two convex mesh plates fixedly installed on the outer wall of the double-layer hollow tube, the two convex mesh plates are distributed up and down on the outer wall of the double-layer hollow tube, a concave mesh plate is arranged between the two convex mesh plates, the concave mesh plate is fixedly connected to the inner wall of the outer tube, a gap is arranged between the convex mesh plate and the inner wall of the outer tube, and a gap is arranged between the concave mesh plate and the double-layer hollow tube.

[0015] Preferably, the hot air blower is fixedly connected to the outer cylinder via a plurality of air outlet pipes, which are distributed in a circular array on the outer wall of the outer cylinder, and one end of the air outlet pipe away from the hot air blower opens upward and is located below the concave mesh plate.

[0016] Preferably, the side wall of the double-layer hollow tube is fixedly connected to an inner connecting ring through a connecting plate, and the inner wall of the outer tube is fixedly installed with an outer connecting ring, the outer connecting ring corresponds to the inner connecting ring, the inner diameter of the outer connecting ring is larger than the inner diameter of the inner connecting ring, and the outer connecting ring and the inner connecting ring are located below the lowest convex mesh layer plate and above the shovel-shaped leaves.

[0017] Preferably, three groups of metal multilayer plates are arranged between the outer connecting ring and the inner connecting ring, the three groups of metal multilayer plates are distributed layer by layer from top to bottom, and each group of metal multilayer plates is distributed in a circular array on the outer wall of the inner connecting ring, the two ends of the metal multilayer plates are respectively fixedly connected to the inner connecting ring and the outer connecting ring, the three groups of metal multilayer plates are arranged obliquely, and the inclination direction of the metal multilayer plate in the middle layer is different from the inclination direction of the metal multilayer plates above and below it.

[0018] Preferably, the metal multilayer board is configured as a multilayer insulating sandwich structure, and the metal sheet surface of the metal multilayer board is provided with protrusions.

[0019] Preferably, a rotating disk is fixedly installed on the top of the inner wall of the outer cylinder, and the rotating disk is rotatably connected to a rotating ring, which is located above the double-layer hollow tube. A circle of first nozzles are respectively provided on the bottom of the rotating disk and the inner wall of the rotating ring, and the first nozzles are inclined away from the center of the rotating disk.

[0020] Compared with the prior art, the advantages of the present invention are:

[0021] 1. The present invention gathers the grains at the bottom of the inner wall of the outer cylinder to the double-layer hollow tube by arranging eccentric and oblique shovel-shaped leaves, which are transported upward by the spiral rod and then naturally fall from the convex mesh plate above to achieve continuous grain circulation, which can effectively avoid the problem of grain backlog or uneven local drying, make the drying process more uniform, and improve the quality of the final product. The shovel-shaped leaves continuously scoop up the grains, which helps to break up the accumulation of grains. When the grains fall from the shovel-shaped leaves, they directly contact the hot air sprayed from the second nozzle, thereby accelerating the transfer of heat and the evaporation of water. The arc groove guides the hot air to flow upward along the arc surface, increasing the contact area between the hot air and the grain surface, and improving the heat exchange efficiency by optimizing the air flow, so that the initial heating process of the grains is uniform and efficient, which helps to enhance the overall drying effect of the grains.

[0022] 2. The present invention arranges an electromagnetic coil inside the outer layer of the double-layer hollow tube and an ultrasonic rod in the interlayer. The electromagnetic coil forms a uniform magnetic field inside the double-layer hollow tube, which is beneficial to the uniform distribution and movement of moisture and reduces the problem of local mold or cracking of grains due to uneven internal moisture distribution. When the spiral rod rotates and cuts the magnetic flux lines, induced current and heat are generated, providing additional drying heat, thereby improving the drying efficiency. The ultrasonic rod destroys the moisture boundary layer and promotes the internal moisture to migrate outward, thereby accelerating the drying process and improving the drying quality. The ultrasonic rod also has the function of sterilization and inhibiting the growth of microorganisms, which helps to improve the storage quality of grains and extend the storage period.

[0023] 3. The present invention forms a multi-level drying space by arranging convex mesh plates and concave mesh plates. During the falling process, the grain will pass through these mesh plates in sequence, which increases the contact time and contact area between the grain and the hot air, thereby improving the drying effect. The air outlet pipe blows hot air to the bottom of the concave mesh plate, which can not only directly accelerate the evaporation of moisture in the grain, but also give the grain a vertical force, so that the grain stays in the air longer, allowing the grain to have more time to exchange heat with the hot air, further improving the drying effect.

[0024] 4. The present invention arranges a rotating ring and a first nozzle. The first nozzle is arranged obliquely to spray hot air to dry the grain on the convex mesh plate. When the first nozzle on the rotating ring sprays air, the rotating ring will be subjected to a reaction force to rotate around the rotating disk, thereby causing the first nozzle on the first rotating ring to rotate synchronously, ensuring that the sprayed hot air is evenly distributed on the convex mesh plate, improving the drying effect, reducing the stagnation area of ​​the hot air on the convex mesh plate, and improving the utilization rate of thermal energy. At the same time, it helps to speed up the falling of grain from the convex mesh plate. The ultrasonic rod drives the convex mesh plate to vibrate, thereby driving the turning and mixing of the grain, which helps to break the adhesion between the grains and enable each grain to fully contact the hot air, thereby improving the uniformity of drying.

[0025] 5. The present invention sets three groups of metal multilayer plates, and the grain passes through the three groups of metal multilayer plates from top to bottom in sequence. The metal multilayer plates are set as a multi-layer insulating sandwich structure, which is helpful for the total induced electromotive force to be superimposed. The superposition of the total induced electromotive force enhances the effect of the magnetic field, so that the magnetic field plays a greater role in the grain drying process, which helps to improve the drying efficiency. The multi-layer metal sheet structure can also increase the distribution density of the magnetic field in space, so that the magnetic field acts on the grain more evenly. At the same time, eddy currents are generated inside the metal multilayer plates under the action of the magnetic field. The multi-layer superimposed metal sheets can also superimpose heat, providing an additional heat source for the grain drying process, which helps to accelerate the evaporation rate of water. The metal sheet surface of the metal multilayer plate is provided with convex points, which can enhance the reflection and scattering effect of ultrasonic waves, thereby generating a more intense cavitation effect around the grain particles and accelerating the evaporation of water. When the magnetic field lines pass through the surface of the metal sheet with tiny convex points, aggregation and scattering phenomena will occur, enhancing the electromagnetic induction effect of the convex parts, further improving the energy utilization rate in the drying process, and helping to dry the grain more effectively.

[0026] In summary, the present invention reduces energy consumption by optimizing the movement path and heating method of grains, and uses additional heat sources generated by electromagnetic induction and ultrasound to improve heat transfer efficiency and reduce heat loss. After a series of drying processes, the grains are finally scattered on the outer circle of shovel-shaped leaves and the drying work is repeated to achieve cyclic drying of the grains and improve overall processing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the overall axonometric structure of an agricultural grain circulation drying device proposed by the present invention.

[0028] Figure 2 This is a schematic diagram of the internal structure of an agricultural grain circulation drying device proposed by the present invention.

[0029] Figure 3 This is a schematic diagram of the structure of an exhaust pipe and a cross ventilation pipe of an agricultural grain circulation drying device proposed by the present invention.

[0030] Figure 4 This is a schematic diagram of the spiral rod and double-layer hollow tube structure of an agricultural grain circulation drying device proposed by the present invention.

[0031] Figure 5 This is a schematic diagram of the structure of an internal connecting ring and a metal multilayer plate of an agricultural grain circulation drying device proposed by the present invention.

[0032] Figure 6 This is a schematic diagram of the shovel-shaped blade and arc-shaped plate structure of an agricultural grain recycling drying device proposed by the present invention.

[0033] Figure 7This is a schematic diagram of the overall side-sectional structure of an agricultural grain circulation drying device proposed by the present invention.

[0034] In the figure: 1 outer cylinder, 2 top cover, 3 support, 4 hot air blower, 5 exhaust pipe, 6 cross ventilation pipe, 7 outlet pipe, 8 rotating ring, 9 first nozzle, 10 connecting pipe, 11 ultrasonic rod, 12 spiral rod, 13 double-layer hollow tube, 14 convex mesh layer plate, 15 concave mesh layer plate, 16 connecting plate, 17 inner connecting ring, 18 metal multilayer plate, 19 outer connecting ring, 20 shovel-shaped leaf, 21 second nozzle, 22 arc plate, 23 turntable, 24 inlet and outlet. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0036] Reference Figures 1 to 7An agricultural grain circulation drying device comprises an outer cylinder 1, a top cover 2 is arranged on the top of the outer cylinder 1, a support 3 is fixedly installed on the bottom of the outer cylinder 1, a hot air blower 4 is fixedly installed on the bottom of the outer cylinder 1, and the hot air blower 4 is located at the bottom center of the outer cylinder 1. The side wall of the outer cylinder 1 is provided with an inlet and outlet 24, and the grain is fed into the outer cylinder 1 through the inlet and outlet 24, and is taken out from the inlet and outlet 24 after circulation drying. A turntable 23 is rotatably connected to the top of the hot air blower 4, and the top of the turntable 23 is flush with the bottom of the inner wall of the outer cylinder 1. The turntable 23 is rotatably connected to the outer cylinder 1, and a plurality of shovel-shaped leaves 20 are fixedly connected to the top of the turntable 23, and the plurality of shovel-shaped leaves 20 are distributed in a circular array on the top of the turntable 23. A plurality of holes are provided through the top of the turntable 23, and the plurality of holes correspond to the plurality of shovel-shaped leaves 20 respectively, and are connected internally, and the hot air blower 4 provides heating gas to enter the interior of the shovel-shaped leaves 20 through the holes on the turntable 23, and the shovel-shaped leaves 20 are eccentrically arranged obliquely, and a circular arc groove is provided on the side of the shovel-shaped leaves 20 away from the shovel blade, and a second nozzle 21 is provided on the side wall of the shovel-shaped leaves 20, and the second nozzle 21 is located in the circular arc groove, and the hot air entering the shovel-shaped leaves 20 is ejected from the second nozzle 21, and a plurality of arc plates 22 are fixedly installed on the shovel-shaped leaves 20, and the plurality of arc plates 22 are evenly distributed on the shovel-shaped leaves 20, and are linearly distributed along the direction close to the center of the turntable 23, and the turntable 23 and the plurality of shovel-shaped leaves 20 are arranged in a circular arc groove. The shovel-shaped leaves 20 rotate and scoop up the grains on the outer circle of the bottom inner wall of the outer cylinder 1. The grains move along the arc surface of the arc plate 22 and then fall downward, so that the grains gradually gather toward the inner circle of the inner bottom of the outer cylinder 1. The eccentrically arranged shovel-shaped leaves 20 can more effectively turn over the grains to avoid grain accumulation and ensure that the grain particles are evenly exposed to the dry hot air, thereby improving the drying efficiency. The arrangement of the shovel-shaped leaves 20 allows a wider range of grain drying, which helps the outer cylinder 1 to process more grains per unit time and improves the processing capacity of the device. The arc plate 22 cooperates with the shovel-shaped leaves 20 to effectively gather the grains from the periphery to the center, reduce the moving distance of the grains during the drying process, and improve In order to improve the aggregation efficiency, the second nozzle 21 is arranged in the arc groove to prevent the fallen grain particles from clogging the air outlet of the second nozzle 21, thereby ensuring unimpeded circulation of hot air. The airflow ejected from the second nozzle 21 flows upward in the arc direction, thereby helping to increase the residence time of the grain in the air, making the grain more dispersed, and at the same time facilitating the uniform contact between the hot air and the grain. The hot air first heats up the grain in the falling process, and then increases the residence time of the grain in the air, thereby making the temperature rise inside the grain more uniform, thereby avoiding the situation where the surface of the grain dries quickly while the inside is not completely dried. By optimizing the movement path and heating method of the grain, it helps to reduce energy consumption and improve energy utilization efficiency.

[0037] A double-layer hollow tube 13 is arranged above the turntable 23, an ultrasonic rod 11 is fixedly installed inside the interlayer of the double-layer hollow tube 13, the inner layer of the double-layer hollow tube 13 is arranged as a mesh-like air-permeable structure, and an electromagnetic coil (not shown in the figure) is arranged inside the outer layer of the double-layer hollow tube 13, a vertical spiral rod 12 is fixedly connected to the center of the top circle of the turntable 23, and the bottom of the spiral rod 12 passes through the turntable 23 and is connected to the hot air blower 4, a vent hole is arranged on the side wall of the center rod of the spiral rod 12, and the hot air blower 4 provides air to the inside of the spiral rod 12. Hot air is ejected from the vent hole. The surface of the vent hole is provided with a mesh structure to effectively block debris from entering the spiral rod 12 from the vent hole. The spiral rod 12 is located in the double-layer hollow tube 13. The central axis of the spiral rod 12 coincides with the central axis of the double-layer hollow tube 13. The grain gathers toward the center. The rotation of the spiral rod 12 causes the grain to move upward. The top of the top cover 2 is fixedly connected with a cross ventilation pipe 6. The top center of the cross ventilation pipe 6 is fixedly connected with an exhaust pipe 5. The exhaust pipe 5 is externally connected to an exhaust pump. The bottom of the cross ventilation pipe 6 There are multiple connecting pipes 10 fixedly connected, the bottom of the connecting pipe 10 is fixedly connected to the top of the double-layer hollow tube 13, and is connected to the interlayer of the double-layer hollow tube 13. The hot air ejected from the vent heats the grain entering the double-layer hollow tube 13. The exhaust pipe 5 works, and the hot air in the double-layer hollow tube 13 flows into the interlayer. The gas in the interlayer is extracted by using the connecting pipe 10 and the cross vent 6. The electromagnetic coil generates a uniform magnetic field, and the water molecules in the grain are polarized, so that the arrangement of the water molecules is more orderly, which is conducive to the uniform distribution and movement of moisture, and reduces the problem of local mold or cracking of the grain caused by uneven internal moisture distribution. The spiral rod 12 generates induced current and heat when it rotates and cuts the magnetic flux lines, which can be directly transferred to the grain to provide additional drying heat, thereby improving the drying efficiency. The ultrasonic rod 11 can destroy the moisture boundary layer and promote the outward migration of internal moisture, thereby accelerating the drying process and improving the drying quality. The ultrasonic rod 11 also has the function of sterilization and inhibition of microbial growth, which helps to improve the storage quality of grain and extend the storage period.

[0038] Two convex mesh plates 14 are fixedly installed on the outer wall of the double-layer hollow tube 13. The two convex mesh plates 14 are distributed up and down on the outer wall of the double-layer hollow tube 13. A concave mesh plate 15 is arranged between the two convex mesh plates 14. The concave mesh plate 15 is fixedly connected to the inner wall of the outer tube 1. A gap is arranged between the convex mesh plate 14 and the inner wall of the outer tube 1. A gap is arranged between the concave mesh plate 15 and the double-layer hollow tube 13. The arrangement of the convex mesh plates 14 and the concave mesh plates 15 forms a multi-layer drying space. During the falling process, the grain will pass through these mesh layers in sequence. The plate increases the contact time and contact area between the grain and the hot air, thereby improving the drying effect. The hot air blower 4 is fixedly connected to the outer cylinder 1 with multiple air outlet pipes 7. The multiple air outlet pipes 7 are distributed in a circular array on the outer wall of the outer cylinder 1. The end of the air outlet pipe 7 away from the hot air blower 4 opens upward and is located below the concave mesh plate 15. A rotating disk is fixedly installed on the top of the inner wall of the outer cylinder 1. The rotating disk is rotatably connected with a rotating ring 8. The rotating ring 8 is located above the double-layer hollow tube 13. The connecting pipe 10 passes through the rotating disk and is fixedly connected to the rotating disk. The bottom of the rotating disk and the inner part of the rotating ring 8 are A circle of first nozzles 9 are respectively arranged on the wall, and the first nozzles 9 are inclined away from the center of the rotating disk. Under the action of the spiral rod 12, the grain is discharged from the double-layer hollow tube 13 and falls on the uppermost convex mesh plate 14. The first nozzles 9 spray hot air to dry the grain. When the first nozzles 9 on the rotating ring 8 spray, the rotating ring 8 rotates around the rotating disk, so that the first nozzles 9 on the rotating ring 8 rotate with the rotating ring 8, which helps to speed up the speed of the grain falling from the uppermost convex mesh plate 14 to the concave mesh plate 15, and can also make the grain more dry during the drying process. The grains are evenly exposed to the hot air, thereby improving the drying efficiency. The vibration of the ultrasonic rod 11 can drive the vibration of the convex mesh plate 14, thereby driving the grains to be turned and mixed, which helps to break the adhesion between the grains and make each grain fully exposed to the hot air, thereby improving the uniformity of drying. At the same time, the hot air blown out by the air outlet pipe 7 can not only directly accelerate the evaporation of water, but also give the grains a vertical force, so that the grains stay in the air longer, so that the grains have more time to exchange heat with the hot air, thereby further improving the drying effect.

[0039] The side wall of the double-layer hollow tube 13 is fixedly connected with an inner connecting ring 17 through a connecting plate 16, and an outer connecting ring 19 is fixedly installed on the inner wall of the outer tube 1, and the outer connecting ring 19 corresponds to the inner connecting ring 17, and the inner diameter of the outer connecting ring 19 is larger than the inner diameter of the inner connecting ring 17. The outer connecting ring 19 and the inner connecting ring 17 are located below the lowest convex mesh layer plate 14 and above the shovel-shaped leaf 20. Three groups of metal multilayer plates 18 are arranged between the outer connecting ring 19 and the inner connecting ring 17. The three groups of metal multilayer plates 18 are distributed layer by layer from top to bottom, and each group of metal The multilayer plates 18 are arranged in a circular array on the outer wall of the inner connecting ring 17, and the two ends of the metal multilayer plates 18 are fixedly connected to the inner connecting ring 17 and the outer connecting ring 19 respectively. The three groups of metal multilayer plates 18 are arranged tilted, and the tilt direction of the metal multilayer plates 18 in the middle layer is different from the tilt directions of the metal multilayer plates 18 in the upper and lower layers. The grain passes through the three groups of metal multilayer plates 18 from top to bottom in sequence, and is fixedly connected through the connecting plate 16, the inner connecting ring 17 and the outer connecting ring 19, and the tilted setting of the metal multilayer plates 18. The whole structure is arranged on the grain. It remains stable during the flow process and is not prone to deformation or damage. The setting of the metal multilayer plate 18 can increase the surface area of ​​heat exchange and improve the heat transfer efficiency, thereby enhancing the drying effect. Through the layer-by-layer distribution of the metal multilayer plate 18, heat can be transferred to the grain more evenly, reducing heat loss and local overheating. When the grain passes through the three-layer metal multilayer plate 18, it is more affected by heat and air flow, which helps to accelerate the evaporation of moisture. Due to the improvement in heat transfer efficiency, the possibility of moisture residue in the grain during the drying process is reduced. The inclined setting of the three-layer metal multilayer plate 18 causes the grain to continuously change its direction of movement during the falling process. Under the guidance of the metal multilayer plate 18, the grain collides, rolls and mixes with each other, allowing the grain to be more evenly distributed between the metal multilayer plates 18, avoiding excessive accumulation of grain in a certain local area, and at the same time prolonging the residence time of the grain in the drying area. Compared with direct vertical fall, this structure makes the grain travel longer and has more time to receive drying treatment, which can better reduce the moisture content, thereby enhancing the drying effect.

[0040] The metal multilayer plate 18 is configured as a multilayer insulating sandwich structure. When the magnetic field passes through these metal sheets separated by insulating materials, each layer of metal sheet will generate an induced electromotive force and an induced current. According to the law of electromagnetic induction, the total induced electromotive force of the multilayer metal sheets will be superimposed. Through the superposition of the multilayer metal sheets, the superposition of the total induced electromotive force enhances the effect of the magnetic field, allowing the magnetic field to play a greater role in the grain drying process, which helps to improve the drying efficiency, because the magnetic field can accelerate the evaporation of water in a variety of ways (such as promoting the movement of water molecules). The multilayer metal sheet structure can guide the magnetic field lines to shuttle between the layers to a certain extent, increase the distribution density of the magnetic field in space, and make the magnetic field act on the grain more evenly, thereby improving the uniformity of drying. At the same time, under the action of the magnetic field, eddy currents are generated inside the metal multilayer plate 18. The multilayer superimposed metal sheets can also superimpose heat, providing an additional heat source for the grain drying process. This auxiliary The heat source can accelerate the evaporation rate of water and further shorten the drying time. The metal sheet surface of the metal multilayer plate 18 is provided with protrusions, which can enhance the reflection and scattering effect of ultrasound, making the reflection and scattering of ultrasound on the metal sheet surface more complicated, thereby producing a more intense cavitation effect around the grain particles. The cavitation effect refers to the process in which ultrasound generates bubbles in a liquid and quickly collapses. This process can destroy the moisture boundary layer on the grain surface and accelerate the evaporation of moisture. The action of ultrasound can accelerate the evaporation process of moisture, thereby improving the drying efficiency. When the magnetic field lines pass through the surface of the metal sheet with tiny protrusions, aggregation and scattering will occur, enhancing the electromagnetic induction effect of the protruding parts. This enhanced electromagnetic induction can further improve the energy utilization rate in the drying process and help to dry the grain more efficiently. Due to the synergistic effect of ultrasound and electromagnetic induction, it can act more evenly on the grain particles and reduce the unevenness in the drying process.

[0041] In the present invention, grain particles are put into the outer cylinder 1 from the inlet and outlet 24, the turntable 23 and the eccentrically obliquely arranged shovel-shaped leaves 20 rotate, and at the same time, the hot air blower 4 uses the holes on the turntable 23 to make the second nozzle 21 in the arc groove on the back side of the shovel blade of the shovel-shaped leaf 20 spray dry hot air outward, and the shovel-shaped leaf 20 scoops up the grain on the outer circle of the bottom of the outer cylinder 1, and the grain moves along the arc of the arc plate 22 and then falls downward, gradually moving to the inner circle of the bottom of the outer cylinder 1 and gathering.

[0042] First, the blades of the shovel-shaped leaves 20 are eccentrically arranged, which can turn the grain more effectively and labor-savingly and expand the drying range, increase the amount of grain processed at the same time, improve the efficiency of the arc plate 22 in gathering the grain from the periphery to the center, break up the possible accumulation structure of the grain, and reduce grain accumulation and blockage;

[0043] Second: The second nozzle 21 is arranged in the arc groove on the back side of the shovel blade 20, which can prevent the fallen grain particles from clogging the air jet during the rotation process, and at the same time guide part of the airflow ejected by the second nozzle 21 to flow upward along the arc direction of the arc groove. The hot air ejected by the second nozzle 21 can firstly heat the grain in the falling process, and secondly increase the residence time of the grain in the air, make the grain more dispersed, prolong the contact time with the hot air, accelerate the temperature rise inside the grain, and make the initial heating process of the grain uniform and efficient.

[0044] After the grains gather toward the center, they move upward driven by the spiral rod 12 inside the double-layer hollow tube 13. The inner layer of the double-layer hollow tube 13 is a mesh air-permeable structure, and an electromagnetic coil is wound inside the outer layer. An ultrasonic rod 11 is arranged between the inner and outer layers. A vent is arranged in the area where the center rod of the spiral rod 12 contacts the grains, and the surface of the vent is isolated by a mesh structure. The hot air blown out by the hot air blower 4 diffuses outward from the inside of the spiral rod 12 into the interlayer of the double-layer hollow tube 13, and the exhaust pipe 5 connects the cross ventilation pipe 6 and the connecting pipe 10 to exhaust air outward.

[0045] First, the hot air is blown out from the vent hole of the central rod of the spiral rod 12, passes through the inner layer of the double-layer hollow tube 13 and enters the interlayer, and then is drawn upward by the connecting tube 10, further driving the temperature of the grain to rise and promoting the outward movement of moisture in the grain;

[0046] Second: There is an electromagnetic coil inside the outer layer of the double-layer hollow tube 13. First, the electromagnetic coil can form a uniform magnetic field inside the double-layer hollow tube 13. Under the action of the magnetic field, the water molecules in the grain will be polarized, making the arrangement of the water molecules more orderly, forming the so-called "magnetic dipole". The water molecules in this state are easier to move, which helps to make the extraction process of the water molecules of the whole grain more uniform, and reduce the problems of local mold or cracking caused by uneven internal moisture distribution in the subsequent drying process; secondly, the spiral rod 12 can cut the magnetic flux lines generated by the electromagnetic coil in the process of spirally feeding upward. According to the law of electromagnetic induction, an induced electromotive force will be generated inside the spiral rod 12. Since the spiral rod 12 is a conductor, an induced current will be formed. When the induced current flows in the spiral rod 12, heat will be generated. This heat can be transferred to the grain, thereby promoting the drying of the grain;

[0047] Third: The setting of the ultrasonic rod 11 can destroy the moisture boundary layer, promote the internal moisture to migrate outward, improve the stability of the grain drying quality, and at the same time have the effect of sterilization and inhibition of microbial growth.

[0048] The grain is pushed by the spiral rod 12 to the convex mesh plate 14 above the device, the first nozzle 9 sprays outward, the vibration of the ultrasonic rod 11 drives the convex mesh plate 14 to vibrate, the grain slides downward through the surface of the convex mesh plate 14, and falls into the concave mesh plate 15 whose outer ring is connected to the inner wall of the outer cylinder 1, the air outlet pipe 7 extending from the hot air blower 4 is inserted into the inner part of the outer cylinder 1, and starts to blow air towards the bottom of the concave mesh plate 15, and the grain then falls through the concave mesh plate 15 to the other convex mesh plates 14 below.

[0049] First: when the first nozzle 9 obliquely arranged on the rotating ring 8 sprays hot air outward, the first nozzle 9, due to its oblique placement, causes the rotating ring 8 to rotate under the reaction of the sprayed hot air, blowing and drying the grain while assisting it to move toward the outer circle of the convex mesh layer plate 14, thereby accelerating the drying process;

[0050] Second: The vibration of the ultrasonic rod 11 drives the convex mesh plate 14 to vibrate, which can drive the grain to be turned and mixed, destroy the moisture boundary layer on the grain surface and promote moisture diffusion, reduce the adhesion and blockage of the grain on the convex mesh plate 14, and improve the drying uniformity and quality;

[0051] Third: The hot air blown out of the air outlet pipe 7 can directly accelerate the evaporation of water and give the grain a vertical force, so that the grain stays in the air longer and the moving route is more varied, further improving the drying efficiency.

[0052] Finally, the grain slides from the outer ring of the bottom convex mesh plate 14 to the metal multilayer plate 18 between the inner connecting ring 17 and the outer connecting ring 19. The inner connecting ring 17 is fixed to the outer wall of the outer hollow tube 13 through the connecting plate 16. The outer layer of the metal multilayer plate 18 has convex points. The oblique array of the metal multilayer plate 18 is an upper, middle and lower three-layer ring structure arranged between the inner connecting ring 17 and the outer connecting ring 19. The inclination direction of the middle layer metal multilayer plate 18 is different from that of the upper and lower layers of the metal multilayer plates 18.

[0053] First: the metal multilayer plate 18 is a multi-layer insulating sandwich design. When the magnetic field passes through these metal sheets separated by insulating materials, each layer of metal sheet will generate induced electromotive force and induced current. According to the law of electromagnetic induction, the total induced electromotive force of the multilayer metal sheets will be superimposed, thereby enhancing the effect of the magnetic field, and the multilayer metal sheet structure can guide the magnetic field lines to shuttle between the layers to a certain extent, increase the distribution density of the magnetic field in space, and at the same time, under the action of the magnetic field, eddy currents are generated inside the metal multilayer plate 18, and the multi-layer superimposed metal sheets can also superimpose heat to assist the grain drying process.

[0054] Second: The outer surface of the metal multilayer plate 18 is provided with convex points, which can firstly enhance the reflection and scattering effect of ultrasonic waves. The reflection and scattering of ultrasonic waves on the surface of the metal sheet will produce a complex sound field, making the cavitation effect around the grain particles more intense, which is beneficial to destroying the moisture boundary layer on the surface of the grain and accelerating the evaporation of moisture; secondly, when the magnetic field lines pass through the surface of the metal sheet with tiny convex points, aggregation and scattering will occur, which will enhance the electromagnetic induction effect of the convex parts and enhance the effect of the magnetic field.

[0055] Third: The three-layer metal multilayer plates 18 are arranged in a circular array and tilted. Firstly, the grains can constantly change their direction of movement during the falling process. Under the guidance of the metal multilayer plates 18 with different tilt angles, the grains collide, roll and mix with each other, so that the grains are more evenly distributed between the metal multilayer plates 18, thus avoiding excessive accumulation of grains in a certain local area. Secondly, the residence time of grains in the drying area is prolonged. Compared with direct vertical falling, this structure makes the grains travel a longer distance and have more time to be dried, which can better reduce the moisture content and achieve a more ideal drying effect.

[0056] Finally, after passing through the metal multilayer plate 18, the grain is scattered downwardly on the outer circle of the shovel-shaped leaves 20 at the bottom of the inner wall of the outer cylinder 1, and the above operation is repeated to realize the cyclic drying of the grain.

[0057] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An agricultural grain circulation drying device, comprising an outer cylinder (1), a top cover (2) is arranged on the top of the outer cylinder (1), a support (3) is fixedly installed on the bottom of the outer cylinder (1), a hot air blower (4) is fixedly installed on the bottom of the outer cylinder (1), the hot air blower (4) is located at the bottom center of the outer cylinder (1), and a side wall of the outer cylinder (1) is provided with a material inlet and outlet (24), characterized in that: Also includes: A shoveling mechanism, the shoveling mechanism comprising a rotating disk (23), the rotating disk (23) being rotatably connected to the top of the hot air blower (4), the top of the rotating disk (23) being flush with the bottom of the inner wall of the outer cylinder (1), the rotating disk (23) being rotatably connected to the outer cylinder (1), a plurality of shovel-shaped leaves (20) being fixedly connected to the top of the rotating disk (23), the plurality of shovel-shaped leaves (20) being distributed in a circular array on the top of the rotating disk (23), the shovel-shaped leaves (20) being eccentrically and obliquely arranged, and a plurality of arc-shaped plates (22) being fixedly mounted on the shovel-shaped leaves (20); A plurality of holes are provided through the top of the rotating disk (23), the plurality of holes respectively corresponding to the plurality of shovel-shaped leaves (20) and being internally connected, a circular arc groove is provided on a side of the shovel-shaped leaf (20) away from the shovel edge, a second nozzle (21) is provided on the side wall of the shovel-shaped leaf (20), and the second nozzle (21) is located in the circular arc groove; A conveying mechanism, the conveying mechanism comprising a double-layer hollow tube (13) arranged above a rotating disk (23), a vertical spiral rod (12) being fixedly connected to the top center of the rotating disk (23), and the spiral rod (12) being located inside the double-layer hollow tube (13); An ultrasonic rod (11) is fixedly installed inside the interlayer of the double-layer hollow tube (13), the inner layer of the double-layer hollow tube (13) is arranged as a mesh-like air-permeable structure, and an electromagnetic coil is arranged inside the outer layer of the double-layer hollow tube (13); The bottom of the spiral rod (12) passes through the rotating disk (23) and is connected to the hot air blower (4); a ventilation hole is provided on the side wall of the central rod of the spiral rod (12); and a mesh structure is provided on the surface of the ventilation hole; It also includes an exhaust mechanism, the exhaust mechanism including a cross ventilation pipe (6) fixedly connected to the top of the top cover (2), the top center of the cross ventilation pipe (6) is fixedly connected to an exhaust pipe (5), the bottom of the cross ventilation pipe (6) is fixedly connected to a plurality of connecting pipes (10), the bottom of the connecting pipe (10) is fixedly connected to the top of the double-layer hollow pipe (13), and is connected to the interlayer of the double-layer hollow pipe (13).

2. The agricultural grain circulation drying device according to claim 1, characterized in that: The invention also comprises a dispersion mechanism, wherein the dispersion mechanism comprises two convex mesh plates (14) fixedly mounted on the outer wall of the double-layer hollow tube (13), the two convex mesh plates (14) being distributed up and down on the outer wall of the double-layer hollow tube (13), a concave mesh plate (15) being arranged between the two convex mesh plates (14), the concave mesh plate (15) being fixedly connected to the inner wall of the outer tube (1), a gap being arranged between the convex mesh plates (14) and the inner wall of the outer tube (1), and a gap being arranged between the concave mesh plates (15) and the double-layer hollow tube (13).

3. The agricultural grain circulation drying device according to claim 2, characterized in that: The hot air blower (4) is fixedly connected to the outer cylinder (1) via a plurality of air outlet pipes (7), the plurality of air outlet pipes (7) being distributed in a circular array on the outer wall of the outer cylinder (1), the end of the air outlet pipe (7) away from the hot air blower (4) opening upwards and being located below the concave mesh plate (15).

4. The agricultural grain circulation drying device according to claim 2, characterized in that: The side wall of the double-layer hollow tube (13) is fixedly connected to an inner connecting ring (17) via a connecting plate (16); the inner wall of the outer tube (1) is fixedly mounted with an outer connecting ring (19); the outer connecting ring (19) corresponds to the inner connecting ring (17); the inner diameter of the outer connecting ring (19) is greater than the inner diameter of the inner connecting ring (17); the outer connecting ring (19) and the inner connecting ring (17) are located below the lowest convex mesh plate (14) and above the shovel-shaped leaf (20).

5. The agricultural grain circulation drying device according to claim 4, characterized in that: Three groups of metal multilayer plates (18) are arranged between the outer connecting ring (19) and the inner connecting ring (17). The three groups of metal multilayer plates (18) are distributed layer by layer from top to bottom, and each group of metal multilayer plates (18) is distributed in a circular array on the outer wall of the inner connecting ring (17). The two ends of the metal multilayer plates (18) are respectively fixedly connected to the inner connecting ring (17) and the outer connecting ring (19). The three groups of metal multilayer plates (18) are arranged obliquely, and the inclination direction of the metal multilayer plates (18) in the middle layer is different from the inclination directions of the metal multilayer plates (18) in the upper and lower layers.

6. The agricultural grain circulation drying device according to claim 5, characterized in that: The metal multilayer plate (18) is configured as a multilayer insulating sandwich structure, and the metal sheet surface of the metal multilayer plate (18) is provided with convex points.

7. The agricultural grain circulation drying device according to claim 1, characterized in that: A rotating disk is fixedly mounted on the top of the inner wall of the outer cylinder (1), and the rotating disk is rotatably connected to a rotating ring (8). The rotating ring (8) is located above the double-layer hollow tube (13). A circle of first nozzles (9) are respectively arranged at the bottom of the rotating disk and the inner wall of the rotating ring (8), and the first nozzles (9) are inclined in a direction away from the center of the rotating disk.

Images