High performance grain drying apparatus

Abstract

The application provides a high-efficiency grain drying device, and belongs to the field of grain drying.The device comprises a material plate and a rake mechanism arranged above the material plate; the rake mechanism comprises a first frame and a second frame which are crossed at the center and are driven to rotate around the center by a motor, and rakes which are arranged on the two frames and are staggered and complementary to each other at different distances from the center; each rake is provided with an L-shaped first working surface and a second working surface which are crossed and are perpendicular to the material plate; and the lower rotating part is controlled by an electromagnetic switch, in a first working state, the first working surface is tangent to a circle corresponding to the center, and a first discharge port is closed, and in a second working state, the lower rotating part is rotated by an acute angle towards the moving direction and the outside of the circle on the basis of the first working state, and the first discharge port is opened. The device realizes more sufficient drying of the material, more uniform heating, and improvement of the drying rate and drying quality, and simultaneously realizes collection of the material without additional transmission mechanism.

Description

Technical Field

[0001] This invention relates to the field of grain drying, and more particularly to a high-efficiency grain drying apparatus. Background Technology

[0002] Moisture is one of the important chemical components of grains. It not only significantly affects the biochemical reactions of seeds but also greatly influences grain processing, storage, and nutritional value. Therefore, after harvesting, grains must be sun-dried or oven-dried to meet the relevant drying conditions.

[0003] Most common drying equipment currently available is deep-bed drying, which primarily increases the drying rate through multiple cycles. However, in deep-bed drying, hot air struggles to penetrate the thick material layer, leading to insufficient drying at the bottom of the pile and excessively long drying times for the surface material. Furthermore, multiple cycles result in longer drying cycles, lower drying efficiency, and the inability to fully utilize effective microwave heat, leading to higher energy consumption. Summary of the Invention

[0004] To address the problems existing in the prior art, the present invention provides a high-efficiency grain drying device.

[0005] This invention provides a high-efficiency grain drying device, comprising: a hot air drying unit and a microwave drying unit, and further comprising: a material plate and a rake tooth mechanism disposed above the material plate, wherein the material plate has a first discharge port with a switch structure in the middle; the rake tooth mechanism includes a first truss and a second truss intersecting at a center, and is driven by a motor to rotate around the center, wherein multiple rake teeth are respectively installed at intervals on the first truss and the second truss, and the rake teeth on the first truss and the rake teeth on the second truss are respectively staggered and complementary with respect to the center; each rake tooth includes an upper rotating part and a lower rotating part rotatably connected, and a mechanism for rotating the lower rotating part. The control mechanism includes a lower rotating part with an L-shaped intersecting first and second working surfaces, both perpendicular to the material plate. The bottom edge of the first working surface is parallel to the material plate, and the bottom edge of the second working surface forms an acute angle with the material plate. Under the control of the control mechanism, the lower rotating part switches between a first working state and a second working state. In the first working state, the first working surface is tangent to the circle corresponding to the center, and the first discharge port is closed. In the second working state, the lower rotating part rotates at an acute angle outward from the direction of motion of the circle based on the first working state, and the first discharge port opens.

[0006] According to the present invention, a high-efficiency grain drying device includes a control mechanism comprising an arc-shaped chute, a slide rod, a magnetic plate, an electromagnetic plate, and a telescopic part; two arc-shaped chutes are symmetrically arranged on the cylindrical inner wall of the rotating part; the magnetic plate and the electromagnetic plate are connected by the telescopic part, one of which is fixed to the bottom of the upper rotating part, and the other is fixedly connected to the slide rod; the slide rod passes through the two arc-shaped chutes, and its two ends are respectively fixed to two extension plates of the lower rotating part, the two extension plates being symmetrically close to the cylindrical outer wall of the upper rotating part; the electromagnetic plate is powered on by a switch, and drives the slide rod to slide up and down the arc-shaped chute through telescopic movement with the magnetic plate, thereby switching between a first working state and a second working state.

[0007] According to the present invention, a high-efficiency grain drying device further includes a cylindrical first drying chamber, wherein the material plate and the rake tooth mechanism are disposed inside the first drying chamber, and the material plate is disposed at the bottom of the first drying chamber; the microwave drying unit includes a microwave magnetron assembly disposed above the rake tooth mechanism; the hot air drying unit includes a drying hot air inlet and an air outlet respectively disposed on the peripheral wall of the first drying chamber, as well as pipes connected to the air inlet and the air outlet, and a heat pump system connected to the pipes.

[0008] According to the present invention, a high-efficiency grain drying device is provided, wherein the complementary arrangement enables the sum of the areas swept by the first working surfaces of all the first and second rake teeth to cover the entire radius during the second working state.

[0009] According to the present invention, a high-efficiency grain drying device is provided, wherein the microwave magnetron assembly includes: a plurality of microwave magnetrons and a spiral ventilation duct, the microwave magnetrons are evenly arranged in the ventilation duct, a cold air inlet is provided at one end of the ventilation duct away from the center, and an air outlet is provided at one end closer to the center, the air outlet being located above the rake tooth mechanism.

[0010] According to the present invention, a high-efficiency grain drying device is provided in which the grain exits from the first discharge port and enters a second drying chamber below the first drying chamber, and the second drying chamber has the same structure as the first drying chamber.

[0011] According to the present invention, a high-efficiency grain drying device is provided in which the grain exits from the second discharge port of the second drying chamber and enters the tempering chamber below the second drying chamber, and the tempering chamber is provided with a discharge port at the bottom.

[0012] According to the present invention, a high-efficiency grain drying device further includes a first motor, a first transmission shaft, a second motor, and a second transmission shaft; the first motor drives the first transmission shaft to drive the rake tooth mechanism to rotate; the second motor drives the second transmission shaft to drive the material plate to rotate in the opposite direction to the rake tooth mechanism.

[0013] According to the present invention, a high-efficiency grain drying device is provided, wherein the first truss and the second truss are perpendicular and cross-shaped; the first working surface and the second working surface are perpendicular, and in the second working state, the first working surface is rotated by an angle of 45° based on the first working state.

[0014] According to the present invention, a high-efficiency grain drying device is provided, wherein the material plate has an upward chamfer near the wall.

[0015] The high-efficiency grain drying device provided by this invention utilizes two working surfaces of rake teeth. During drying, the inclined surface of the rake teeth serves as the first working surface, dispersing and evenly spreading the material. The material is circulated and turned during drying to ensure more thorough contact between the material and hot air. After drying, a switch controls the rake tooth mechanism to change direction. At this point, the second working surface becomes the main working surface, combining with the first working surface to gather the material towards the center. The rake teeth on the two crossbars are arranged complementaryly, scanning the entire bottom surface during material collection. Finally, the material is discharged through the first outlet. This device continuously changes the contact surface between the material and hot air during the drying process through the rake tooth mechanism, resulting in more thorough drying and more uniform heating, significantly improving the drying rate and quality. Furthermore, it eliminates the need for additional conveyor belts and pipes, and simultaneously achieves material collection based on the rake tooth mechanism, greatly reducing the size and complexity of the drying device. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in this invention 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 some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the rake tooth mechanism of the high-efficiency grain drying device provided by the present invention;

[0018] Figure 2 This is a top view of the rake tooth mechanism of the high-efficiency grain drying device provided by the present invention;

[0019] Figure 3 This is a schematic diagram of the rake tooth structure of the high-efficiency grain drying device provided by the present invention;

[0020] Figure 4 This is a schematic diagram of the first discharge port structure provided by the present invention;

[0021] Figure 5 This is a schematic diagram of the internal structure of the rake teeth of the high-efficiency grain drying device provided by the present invention;

[0022] Figure 6 This is one of the structural schematic diagrams of the high-efficiency grain drying device provided by the present invention;

[0023] Figure 7 This is the second schematic diagram of the high-efficiency grain drying device provided by the present invention;

[0024] Figure 8 This is a schematic diagram of the microwave magnetron assembly structure provided by the present invention;

[0025] Explanation of reference numerals in the attached drawings: 1. Feed inlet; 2. Microwave magnetron; 3. Air outlet duct; 4. First drive shaft; 5. First drying chamber; 6. Rake tooth mechanism; 7. Material plate; 8. Air inlet duct; 9. Second drying chamber; 10. Heat pump system; 11. Tempering chamber; 12. Support column; 13. Feed outlet; 15. Second drive shaft; 16. Second motor; 17. First motor; 631. First working surface; 632. Second working surface; 633. Arc-shaped chute; 634. Slide rod; 635. Magnetic suction plate; 636. Spring; 637. Telescopic rod; 638. Electromagnetic plate; 21. Microwave magnetron; 22. Air outlet of the duct; 23. Air inlet of the duct. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0027] The following is combined Figures 1-8 The present invention describes a high-efficiency grain drying apparatus. Figure 1 This is a schematic diagram of the rake tooth mechanism of the high-efficiency grain drying device provided by the present invention, as shown below. Figure 1As shown, the present invention provides a high-efficiency grain drying device, including: a hot air drying unit, a microwave drying unit, a material plate 7, and a rake tooth mechanism 6 disposed above the material plate. The material plate 7 has a first discharge port with a switch structure in the middle. The rake tooth mechanism 6 includes a first truss 61 and a second truss 62 intersecting at a center, and is driven by a motor to rotate around the center. Multiple rake teeth 63 are respectively installed at intervals on the first truss 61 and the second truss 62. The distances between the rake teeth 61 on the first truss and the rake teeth 62 on the second truss and the center are staggered and complementary. (See reference for details.) Figure 2 .

[0028] Each of the rake teeth 63 includes an upper rotating part and a lower rotating part rotatably connected, and a control mechanism for rotating the lower rotating part. The lower rotating part is provided with an L-shaped intersecting first working surface 631 and a second working surface 632, both of which are perpendicular to the material plate. The bottom edge of the first working surface 631 is parallel to the material plate 7, and the bottom edge of the second working surface 632 forms an acute angle with the material plate 7.

[0029] The lower steering part switches between a first working state and a second working state under the control of the control mechanism. In the first working state, the first working surface 631 is tangent to the circle corresponding to the center, and the first discharge port is closed. In the second working state, the lower rotating part rotates acutely outward of the circle in the direction of movement based on the first working state, and the first discharge port is opened.

[0030] The hot air drying unit supplies hot air to the grains on the material plate 7, and the microwave drying unit supplies microwaves for drying. The material plate 7 is used to hold the grains to be dried, and a first discharge port with a switch structure is provided in the middle of the material plate 7. The discharge port is as follows: Figure 4 As shown. Multiple rake teeth 63 are arranged according to... Figure 2 The arrangement shown is installed on the first truss 61 and the second truss 62, which intersect at the center, respectively. Specifically, it can be a cross truss, such as... Figure 2 As shown, the rake teeth 63 on the two trusses are complementary, that is, the rake teeth on the first truss 61 and the second truss 62 are installed in a complementary manner with one position apart, which ensures that the mechanism can scan the entire material plate.

[0031] During drying, the hot air drying unit and the microwave drying unit operate, and the lower steering unit rotates to the first working state under the control of the electromagnetic switch. At this time, the first working surface 631 of all the rake teeth is tangent to the circle corresponding to the center, that is, the normal of the first working surface 631 points to the center. Figure 3 As shown, the rake mechanism is driven by a motor to rotate around the center, and the first working surface 631 first breaks up and spreads the grain pile evenly to facilitate thorough drying.

[0032] After drying, the lower rotating part rotates to the second working state under the control of the electromagnetic switch. At this time, the entire lower rotating part rotates at an acute angle from the direction of movement and outward of the circle (if it is towards the inside of the circle, i.e., towards the center, it will push the grain to the sides), and the first discharge port opens. When the whole rotates at an acute angle of less than 90 degrees and towards the outside of the circle, the first working surface intersects with the circle. During the rotation, it can provide a radial force to the grain, thus achieving the collection of dried material. That is, the integrated structure formed by the first working surface 631 and the second working surface 632 at this time is as follows: Figure 3 As shown on the right, the dried material can be collected during the rotation process and discharged through the first discharge port.

[0033] The control mechanism can be an electromagnetic switch, and the upper rotating part can be fixed on the truss.

[0034] This invention relates to a high-efficiency grain drying device. The rake teeth have two working surfaces. During drying, the inclined surface of the rake teeth serves as the first working surface, dispersing and evenly spreading the material. The material is circulated and turned during drying to ensure more thorough contact between the material and the hot air. After drying, the rake tooth mechanism is turned by a switch. At this point, the second surface becomes the main working surface, combining with the first working surface to gather the material towards the center. The rake teeth on the two crossbars are arranged complementaryly, scanning the entire bottom surface during material collection. Finally, the material is discharged through the first outlet. This device continuously changes the contact surface between the material and the hot air during the drying process through the rake tooth mechanism, resulting in more thorough drying and more uniform heating, greatly improving the drying rate and quality. Furthermore, it eliminates the need for additional conveyor belts and pipes, and simultaneously achieves material collection based on the rake tooth mechanism, significantly reducing the size and complexity of the drying device.

[0035] In one embodiment, the control mechanism includes an arc-shaped slide groove 633, a slide rod 634, a magnetic suction plate 635, an electromagnetic plate 638, and a telescopic part; two arc-shaped slide grooves 633 are centrally symmetrically arranged on the cylindrical inner wall of the rotating part; the magnetic suction plate 635 and the electromagnetic plate 638 are connected by the telescopic part, one of which is fixed to the bottom of the upper rotating part, and the other is fixedly connected to the slide rod 634; the slide rod 634 passes through the two arc-shaped slide grooves 633, and its two ends are respectively fixed to two extension plates of the lower rotating part, and the two extension plates are symmetrically close to the cylindrical outer wall of the upper rotating part; the electromagnetic plate 638 is powered on by a switch, and drives the slide rod 634 to slide up and down in the arc-shaped slide groove 633 by telescoping with the magnetic suction plate 635, so as to realize the switching between the first working state and the second working state.

[0036] like Figure 5As shown, the telescopic part can adopt a cylinder structure or a spring structure. Taking the spring structure as an example, it can include a spring 636, or both a spring 636 and a telescopic rod 637. Considering that the energized part is not easy to move, the electromagnetic plate 638 can be fixedly set, while the magnetic suction plate 635 is fixed to the slide rod to achieve up and down movement. Figure 4 As shown, the magnetic plate 635 is provided with two telescopic parts, which are achieved by four springs 636 and four telescopic rods 637 to provide a stable rotation process.

[0037] For example, in the initial state, the first working surface is tangent to the circle, and the second working surface works to achieve grain drying.

[0038] When the reversing switch is pressed, the internal electromagnetic plate 638 generates a strong magnet when energized. The two magnetic plates 635 move downwards under the attraction of the electromagnetic plate 638, driving the slide rod 634 down along the chute 633. At this time, the four springs 636 and four telescopic rods 637 are all in a compressed state. Upon reaching the bottom of the chute, the reversing motion is completed. The outer slide rod 634 slides downwards a distance within the chute 633, simultaneously gliding 90° along the wall, thereby causing the lower reversing part to rotate 45° in the direction of linear velocity. Correspondingly, the first working surface of the rake teeth rotates 45°, so that during collection, the first working surface is the primary working surface, while the second working surface provides assistance.

[0039] When the switch is pressed again to turn off, the electromagnetic plate 638 is de-energized, and the magnetic suction plate 635 moves upward under the action of the spring 636, which drives the slide rod 634 to move upward along the slide groove 633. The rake teeth are reset and the second working surface starts working to achieve grain drying.

[0040] In one embodiment, the system further includes a cylindrical first drying chamber 5, in which the microwave drying unit, the material plate 7, and the rake tooth mechanism 6 are disposed inside the first drying chamber, and the material plate 7 is disposed at the bottom of the first drying chamber 5; the microwave drying unit includes a microwave magnetron assembly 2 disposed above the rake tooth mechanism; the hot air drying unit includes a drying hot air inlet and an air outlet respectively disposed on the peripheral wall of the first drying chamber, as well as pipes connected to the inlet and the air outlet, and a heat pump system 10 connected to the pipes.

[0041] like Figure 6 As shown, the pipes connected to the air inlet and outlet are the air inlet pipe 8 and the air outlet pipe 3. Hot air is generated by the heat pump system 10, enters the drying chamber from the air inlet pipe 8, and flows out from the air outlet pipe 3. The present invention uses a rake tooth mechanism 6 for auxiliary drying and collection, thereby employing a cylindrical first drying chamber 5.

[0042] The grain is first pre-dried using microwaves inside the drying chamber, followed by hot air drying. During microwave drying, both moisture and temperature diffuse from the inside out, which is the opposite of hot air drying. This sequential drying method, combined with hot air drying, accelerates the evaporation of moisture from the grain, greatly increasing the drying rate and saving energy. At the same time, microwave drying can sterilize and eliminate pests, ensuring the quality of the dried grain.

[0043] This invention utilizes the characteristic of moisture gradient diffusion from the inside to the outside during microwave drying, combined with the characteristic of heat and mass transfer from the outside to the inside during hot air drying, to achieve a sequential drying method that effectively improves the drying rate of rice.

[0044] In one embodiment, the complementary arrangement enables the sum of the areas swept by the first working surfaces of all the first and second truss rake teeth to cover the entire radius during the second working state.

[0045] Taking into account the structure after rotation in the second working state, when all the rake teeth rotate around the center, the area scanned by the first working surface 631 can cover the entire radius area, thereby avoiding omissions during collection.

[0046] In one embodiment, the microwave magnetron assembly 2 includes: a plurality of microwave magnetrons 21 and a spiral ventilation duct. The microwave magnetrons 21 are evenly arranged in the ventilation duct. The ventilation duct has a cold air inlet 23 at one end away from the center and an air outlet 22 at one end closer to the center. The air outlet is located above the rake tooth mechanism 6.

[0047] Microwave magnetrons 21 are arranged in a certain way, such as... Figure 8 In the cold air duct shown, from Figure 6 Cold air is introduced through inlet 23, and the heat emitted by the magnetron is used to heat the cold air. Then, it enters the drying chamber through inlet 22. This can effectively prevent the magnetron from aging due to heat loss during operation, thus playing a role in cooling, and can also make full use of the heat emitted by the magnetron to heat the cold air. At the same time, the dried exhaust gas enters the hot and cold system through the exhaust pipe 3. After treatment, the residual heat and latent heat are recovered, providing a certain energy source for hot air drying and improving energy utilization.

[0048] In this invention, microwave magnetrons are arranged inside a cold air duct within a microwave drying chamber. The heat emitted by the microwave magnetrons during operation is used to cool the magnetrons by introducing cold air, preventing excessive heat generation. This also allows the magnetrons to be used as a heat source to heat the cold air for drying.

[0049] In one embodiment, the grain exits from the first discharge port and enters a second drying chamber 9 below the first drying chamber. The second drying chamber 9 has the same structure as the first drying chamber 5. Specifically, after exiting from the first discharge port, the grain enters the next drying chamber. By using multiple drying chambers, the drying efficiency can be effectively accelerated.

[0050] In one embodiment, the grain exits from the second outlet of the second drying chamber 9 and enters the tempering chamber 11 below the second drying chamber, and the tempering chamber 13 is provided with a discharge port at its lowest point.

[0051] Specifically, such as Figure 6 and Figure 7 As shown, the two drying chambers and the rehydration chamber are connected and fixed by support column 12.

[0052] In one embodiment, the system further includes a first motor 17, a first drive shaft 4, a second motor 16, and a second drive shaft 15; the first motor 17 drives the first drive shaft 4 to drive the rake tooth mechanism 6 to rotate; the second motor 16 drives the second drive shaft 15 to drive the material plate to rotate in the opposite direction to the rake tooth mechanism.

[0053] The material plate 7 and the rake tooth mechanism 6 rotate in opposite directions, which can accelerate the tumbling of the material and drive the material to rotate under the action of centrifugal force, so that the material can fully contact the hot air, increase the contact area, improve the drying rate, and ensure the drying quality.

[0054] In one embodiment, the first truss 61 and the second truss 62 are perpendicular and cross each other; the first working surface 631 and the second working surface 632 are perpendicular, and in the second working state, the first working surface is rotated by an angle of 45° based on the first working state.

[0055] Specifically, the material is fed into the first drying chamber 5 through the feed inlet 1. At the start of drying, the rake mechanism 6 rotates under the drive of the motor 17 and the transmission shaft 4. At this time, the second working surface 632 is operational, breaking up and evenly spreading the material. Throughout the drying process, this mechanism continuously circulates and rotates the material, increasing the contact area between the material and the hot air, effectively improving the drying rate. The entire rake mechanism is a complementary circle to ensure that material is scanned from every direction at the bottom.

[0056] Optionally, the material plate has an upward chamfer near the wall. That is, the bottom plate near the wall is designed with a certain height and an upward chamfer to form a slope, preventing material from being difficult to collect in corners. Simultaneously, the material plate 7 rotates in the opposite direction to the rake mechanism under the drive of the motor 16 and the drive shaft 15, to fully tumble and evenly spread the material, increasing the contact area between the material and the hot air, ensuring that the material can be dried thoroughly from the bottom, greatly improving drying efficiency and post-drying quality. After the first stage of drying is completed, the rake mechanism 6 reverses direction (e.g., ...). Figure 3 (As shown on the right), specifically, the switching on and off of the electromagnet can be controlled by a switch. During reversal, the working surface only turns at an acute angle, preferably 45°. When collecting materials, the first working surface 631 mainly works, collecting the materials towards the center, while simultaneously opening the unloading channel 7 of the material plate 7 (as shown on the right). Figure 4 As shown, the material enters a drying chamber 9. After all the material is dried, the rake mechanism 6 turns to return to the state of the first working face and closes the discharge port.

[0057] When performing microwave and hot air sequential drying, the microwave magnetron is arranged in the pipe (e.g., Figure 8 As shown, cold air is introduced through the air inlet 23 of the pipe, which can both cool the magnetron during operation and use the heat generated by the magnetron to heat the air as a hot air drying medium. The air exits from the pipe outlet 22 and enters the drying chamber, making full use of thermal energy and improving energy utilization efficiency. After drying in the first drying chamber 5, the air enters the second drying chamber 9, and finally enters the tempering chamber 11 for a certain period of heat preservation and tempering. Finally, the air is discharged from the discharge port 13 to complete the drying process.

[0058] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A high-efficiency grain drying device, comprising a hot air drying unit and a microwave drying unit, characterized in that, Also includes: The material plate and the rake tooth mechanism provided above the material plate, wherein the material plate has a first discharge port with a switch structure in the middle; The rake tooth mechanism includes a first truss and a second truss that intersect at the center and are driven by a motor to rotate around the center. Multiple rake teeth are installed at intervals on the first truss and the second truss, and the distances between the rake teeth on the first truss and the rake teeth on the second truss and the center are staggered and complementary. Each of the rake teeth includes an upper rotating part and a lower rotating part rotatably connected, and a control mechanism for rotating the lower rotating part. The lower rotating part is provided with an L-shaped intersecting first working surface and a second working surface. Both working surfaces are perpendicular to the material plate. The bottom edge of the first working surface is parallel to the material plate, and the bottom edge of the second working surface forms an acute angle with the material plate. The lower rotating part switches between a first working state and a second working state under the control of the control mechanism. In the first working state, the first working surface is tangent to the circle corresponding to the center, and the first discharge port is closed. In the second working state, the lower rotating part rotates acutely outward of the circle in the direction of movement based on the first working state, and the first discharge port is opened. The control mechanism includes an arc-shaped slide, a slide rod, a magnetic plate, an electromagnetic plate, and a telescopic part; The two arc-shaped grooves are symmetrically arranged on the cylindrical inner wall of the rotating part; The magnetic plate and the electromagnetic plate are connected by the telescopic part, which includes a spring and a telescopic rod. The slide bar passes through the two arc-shaped slide grooves and its two ends are respectively fixed to the two extension plates of the lower rotating part. The two extension plates are symmetrically close to the cylindrical outer wall of the upper rotating part. The electromagnetic plate is powered on by a switch, and the slide rod is driven to slide up and down in the arc-shaped groove by telescoping with the magnetic plate, so as to switch between the first working state and the second working state. It also includes a cylindrical first drying chamber, in which the microwave drying unit, the material plate and the rake tooth mechanism are disposed inside the first drying chamber, and the material plate is disposed at the bottom of the first drying chamber; The microwave drying unit includes a microwave magnetron assembly positioned above the rake tooth mechanism.

2. The high-efficiency grain drying device according to claim 1, characterized in that, The hot air drying unit includes a hot air inlet and an air outlet respectively provided on the peripheral wall of the first drying chamber, as well as pipes connected to the inlet and the air outlet, and a heat pump system connected to the pipes.

3. The high-efficiency grain drying device according to claim 1, characterized in that, The microwave magnetron assembly includes: Multiple microwave magnetrons and a spiral ventilation duct are provided. The microwave magnetrons are evenly arranged in the ventilation duct, and a cold air inlet is provided at the end of the ventilation duct away from the center.

4. The high-efficiency grain drying device according to claim 1, characterized in that, After the grain exits from the first discharge port, it enters the second drying chamber below the first drying chamber. The second drying chamber has the same structure as the first drying chamber. After the grain exits from the second discharge port of the second drying chamber, it enters the tempering chamber below the second drying chamber, and the tempering chamber is provided with a discharge port at the bottom.

5. The high-efficiency grain drying device according to claim 1, characterized in that, It also includes a first motor, a first drive shaft, a second motor, and a second drive shaft; The first motor drives the first transmission shaft to drive the rake tooth mechanism to rotate; The second motor drives the second transmission shaft to drive the material plate to rotate in the opposite direction to the rake tooth mechanism.

6. The high-efficiency grain drying device according to claim 1, characterized in that, The first truss and the second truss are perpendicular and intersect in a cross shape; The first working surface and the second working surface are perpendicular. In the second working state, the first working surface is rotated by an angle of 45° based on the first working state.

7. The high-efficiency grain drying device according to claim 1, characterized in that, The material plate has an upward chamfer near the wall.

Images