Multi-layer mesh belt type agricultural product drying device

Abstract

The utility model relates to the technical fields of drying device especially is concerned on a kind of multilayer mesh belt type agricultural product drying device, it uses multiple obliquely arranged mesh belt, makes loading position lower, increase the drying path of agricultural product, improve drying efficiency;Including drying cabinet and hot air machine;Still include feeding mesh belt subassembly, multiple transfer mesh belt subassembly, output mesh belt subassembly, multiple grating plate and drive mechanism, feeding mesh belt subassembly and multiple transfer mesh belt subassembly are obliquely installed in drying cabinet, the outer end of output mesh belt subassembly extends the outside of discharge port, multiple grating plate is respectively obliquely installed in the rear side of feeding mesh belt subassembly and multiple transfer mesh belt subassembly, lower conveying channel is set between multiple grating plate and feeding mesh belt subassembly and multiple transfer mesh belt subassembly, drive mechanism is installed on drying cabinet, and drive mechanism drives feeding mesh belt subassembly, multiple transfer mesh belt subassembly and output mesh belt subassembly rotation.

Description

Technical Field

[0001] This utility model relates to the technical field of drying devices, and in particular to a multi-layer mesh belt agricultural product drying device. Background Technology

[0002] After hot air drying, agricultural products can be stored for a long time, facilitating transportation and further processing. Chinese utility model patent CN221959224U discloses a multi-layer mesh belt drying device with a screening function. This device includes an inclined conveyor belt and a drying shell. The top of the drying shell is open, and the upper end of the inclined conveyor belt is located above the drying shell. Multiple drying conveyor belts are arranged along the height of the drying shell, with adjacent conveyor belts moving in opposite directions. A guide plate is installed between the output end of the upper drying conveyor belt and the input end of the lower adjacent drying conveyor belt. Through multi-stage screening and drying, the dried material is discharged, while the undried material enters the next stage for further drying. After multi-stage drying and screening, the moisture content of the dried material will be nearly uniform, resulting in a better drying effect.

[0003] However, the multi-layer mesh belts of the aforementioned multi-layer mesh belt drying device are horizontally arranged, and the agricultural products descend layer by layer from top to bottom. This results in a high feeding position, which is not conducive to feeding. Moreover, the horizontally arranged multi-layer mesh belts only transport the upper surface of the agricultural products, resulting in a shorter drying path and lower drying efficiency. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a multi-layer mesh belt type agricultural product drying device that uses multiple inclined mesh belts to lower the feeding position, increase the drying path of agricultural products, and improve drying efficiency.

[0005] This utility model discloses a multi-layer mesh belt type agricultural product drying device, including a drying box and a hot air blower. The drying box has a drying chamber inside, and the hot air blower is installed on the drying box, supplying hot air into the drying chamber. It also includes a feeding mesh belt assembly, multiple intermediate mesh belt assemblies, an output mesh belt assembly, multiple grid plates, and a drive mechanism. A feed inlet communicating with the drying chamber is located on the lower right side wall of the drying box, and a discharge outlet communicating with the drying chamber is located on the lower left side wall of the drying box. The feeding mesh belt assembly and the multiple intermediate mesh belt assemblies are installed at an angle within the drying chamber of the drying box. The upper part of the conveyor belt assembly is inclined towards the discharge port. The lower end of the feed conveyor belt assembly extends beyond the feed port of the drying chamber. The output conveyor belt assembly is horizontally positioned, with its inner end located below the upper end of the leftmost intermediate conveyor belt assembly. Its outer end extends beyond the discharge port. Multiple grid plates are respectively inclinedly installed behind the feed conveyor belt assembly and the multiple intermediate conveyor belt assemblies. Lower conveyor channels are provided between the multiple grid plates and the feed conveyor belt assembly and the multiple intermediate conveyor belt assemblies. The lower ends of the multiple lower conveyor channels are respectively located above the lower ends of the multiple intermediate conveyor belt assemblies and above the inner end of the output conveyor belt assembly. The drive mechanism... Installed on the drying chamber, the drive mechanism drives the feeding mesh belt assembly, multiple intermediate mesh belt assemblies, and the output mesh belt assembly to rotate. During operation, agricultural products are placed on the lower end of the feeding mesh belt assembly, which tilts and conveys the products upwards into the drying chamber of the drying chamber. Once the products reach the upper end of the feeding mesh belt assembly, they flip and enter the first lower conveying channel between the first grid plate and the feeding mesh belt assembly. The products are then conveyed through this channel to the lower end of the first intermediate mesh belt assembly, which again tilts and conveys the products upwards before flipping them into the second grid plate. In the second lower conveying channel between the plate and the first transfer mesh belt assembly, the above operation is repeated until the agricultural products are conveyed to the output mesh belt assembly. The output mesh belt assembly discharges the agricultural products to the outside of the drying box through the discharge port. During the conveying of agricultural products, the hot air blower delivers hot air through the mesh holes of the feeding mesh belt assembly and multiple transfer mesh belt assemblies, as well as the ventilation holes of multiple grid plates, to dry the agricultural products. Compared with the prior art, the use of multiple inclined mesh belts lowers the feeding position, making feeding easier. Moreover, the agricultural products are conveyed on two surfaces of multiple mesh belts, increasing the drying path of the agricultural products and improving drying efficiency.

[0006] Preferably, it also includes a feeding hopper, which is installed on the feed inlet of the drying box, and the lower end of the feeding mesh belt assembly is located in the feeding hopper; by setting up the feeding hopper, the feeding is constrained, the feeding efficiency is improved, and the falling of agricultural products is reduced.

[0007] Preferably, it also includes multiple push plates, with multiple push plates evenly installed on the feeding mesh belt assembly and multiple transfer mesh belt assemblies respectively; by setting multiple push plates, agricultural products are prevented from rolling down along the inclined feeding mesh belt assembly and multiple transfer mesh belt assemblies, thereby improving the conveying efficiency of agricultural products.

[0008] Preferably, it also includes multiple guide plates, which are respectively installed at the lower ends of multiple grid plates, with the lower ends of the multiple guide plates facing the lower ends of multiple transfer mesh belt assemblies; the multiple guide plates guide multiple agricultural products conveyed along the multiple grid plates to the multiple transfer mesh belt assemblies, so that the agricultural products are more stably conveyed to the lower ends of the multiple transfer mesh belt assemblies, thereby improving the transfer efficiency of agricultural products between the multiple transfer mesh belt assemblies.

[0009] Preferably, the hot air blower includes a wind box, a blower, and a heater. The wind box is installed on the side wall of the drying chamber, with an air inlet at the outer end and an air outlet at the inner end. The blower and heater are installed inside the wind box. The heater heats the air inside the wind box, and the blower operates to input the hot air into the drying chamber of the drying chamber, so that the hot air dries the agricultural products.

[0010] Preferably, it also includes multiple gates, which are vertically rotatable in the air inlet of the air box via multiple rotating shafts. The multiple gates cooperate to close the air inlet of the air box. Adjusting the angle of the multiple gates adjusts the size of the opening of the air inlet of the air box, thereby adjusting the air intake.

[0011] Preferably, the assembly also includes a stepper motor, gear one, gear two, multiple swing arms, and two pull rods. The stepper motor is installed in the middle of the air box. Gear one is concentrically mounted on the output shaft of the stepper motor. Gear two is rotatably mounted on the air box and meshes with gear one. The inner ends of the multiple swing arms are respectively mounted on the rotating shafts of gear one, gear two, and multiple gates. The inner end of one pull rod is rotatably connected to the outer end of the swing arm on gear one, and the outer end of one pull rod is rotatably connected to the outer ends of multiple swing arms outside gear one. The inner end of another pull rod is rotatably connected to the outer end of the swing arm on gear two, and the outer end of another pull rod is rotatably connected to the outer ends of multiple swing arms outside gear two. The stepper motor drives gear one to rotate, and gear one meshes with gear two to rotate synchronously in opposite directions. This causes gear one and gear two to drive the two swing arms on them to drive the two pull rods to pull the multiple swing arms outside gear one and gear two, so that the multiple swing arms on the multiple outer sides drive multiple gates to rotate through multiple rotating shafts, thereby realizing the angle adjustment of multiple gates.

[0012] Preferably, the assembly also includes a return air duct, multiple fins, and a waste discharge duct. One end of the return air duct is connected to the drying chamber of the drying oven, and the other end is connected to the interior of the air box. Multiple fins are installed on the outer wall of the return air duct. When the damper opens inwards towards the interior of the air box, the other end of the return air duct is closed. The waste discharge duct is installed at the lower position of the return air duct. When the multiple dampers open inwards, one end of the return air duct is closed, so that air can only enter the air box through the air inlet. When the multiple dampers flip outwards to close the air inlet of the air box, one end of the return air duct is connected to the interior of the air box. At this time, the hot and humid air in the drying chamber of the drying oven is input into the air box through the return air duct to form a hot air internal circulation. When the hot and humid air is transported through the return air duct, the multiple fins increase the heat dissipation area of ​​the return air duct, so that most of the moisture in the hot and humid air condenses. The condensate is discharged through the waste discharge duct, improving the energy-saving effect of drying.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: the use of multiple inclined mesh belts lowers the feeding position, making feeding easier, and the agricultural products are transported on two surfaces of multiple mesh belts, increasing the drying path of the agricultural products and improving drying efficiency. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This is a front sectional view of the present invention;

[0016] Figure 3 This is a schematic diagram of the isometric structure of this utility model;

[0017] Figure 4 It is a structural diagram of the feeding conveyor belt assembly, the transfer conveyor belt assembly, the output conveyor belt assembly, the grating plate, and the drive mechanism, etc.

[0018] Figure 5 It is a structural diagram of the feeding conveyor belt assembly, the transfer conveyor belt assembly, the grating plate, the push plate, and the guide plate, etc.

[0019] Figure 6 This is a structural diagram of a hot air blower or similar device.

[0020] The following components are labeled in the attached diagram: 1. Drying box; 2. Hot air blower; 3. Feeding conveyor belt assembly; 4. Transfer conveyor belt assembly; 5. Output conveyor belt assembly; 6. Grating plate; 7. Drive mechanism; 8. Feed hopper; 9. Push plate; 10. Guide plate; 11. Air box; 12. Blower; 13. Heater; 14. Gate; 15. Stepper motor; 16. Gear 1; 17. Gear 2; 18. Swing arm; 19. Tie rod; 20. Return air duct; 21. Fin; 22. Residue discharge pipe. Detailed Implementation

[0021] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. This utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to make the disclosure of this utility model more thorough and complete. Example 1

[0022] like Figures 1 to 5 As shown, a multi-layer mesh belt type agricultural product drying device includes a drying box 1 and a hot air blower 2. The drying box 1 has a drying chamber inside. The hot air blower 2 is installed on the drying box 1 and delivers hot air into the drying chamber of the drying box 1. It also includes a feeding mesh belt assembly 3, multiple intermediate mesh belt assemblies 4, an output mesh belt assembly 5, multiple grid plates 6, and a drive mechanism 7. A feed inlet communicating with the drying chamber is located on the lower part of the right side wall of the drying box 1, and a discharge outlet communicating with the drying chamber is located on the lower part of the left side wall of the drying box 1. The feeding mesh belt assembly 3 and the multiple intermediate mesh belt assemblies 4 are installed obliquely in the drying chamber of the drying box 1, with their upper surfaces inclined towards the discharge outlet. The lower end of the feeding mesh belt assembly 3 extends outside the feed inlet of the drying box 1. The output mesh belt assembly 5 is horizontally positioned, with its inner end located below the upper end of the leftmost intermediate mesh belt assembly 4, and its outer end extending beyond the discharge outlet. On the outer side, multiple grid plates 6 are respectively inclinedly installed on the rear side of the feeding mesh belt assembly 3 and multiple transfer mesh belt assemblies 4. A lower conveying channel is set between the multiple grid plates 6 and the feeding mesh belt assembly 3 and the multiple transfer mesh belt assemblies 4. The lower ends of the multiple lower conveying channels are respectively located above the lower ends of the multiple transfer mesh belt assemblies 4 and above the inner ends of the output mesh belt assembly 5. A drive mechanism 7 is installed on the drying box 1. The drive mechanism 7 drives the feeding mesh belt assembly 3, the multiple transfer mesh belt assemblies 4 and the output mesh belt assembly 5 to rotate. It also includes a feeding hopper 8, which is installed on the feed inlet of the drying box 1. The lower end of the feeding mesh belt assembly 3 is located in the feeding hopper 8. It also includes multiple push plates 9, which are evenly installed on the feeding mesh belt assembly 3 and the multiple transfer mesh belt assemblies 4. It also includes multiple guide plates 10, which are respectively installed on the lower ends of the multiple grid plates 6. The lower ends of the multiple guide plates 10 are respectively facing the lower ends of the multiple transfer mesh belt assemblies 4.

[0023] During operation, the feeding hopper 8 constrains the feeding, improving feeding efficiency and reducing agricultural product drop. Agricultural products are placed on the lower end of the feeding mesh belt assembly 3 via the feeding hopper 8. The feeding mesh belt assembly 3 then tilts and conveys the agricultural products upwards into the drying chamber of the drying box 1. After reaching the upper end of the feeding mesh belt assembly 3, the agricultural products flip and enter the first lower conveying channel between the first grid plate 6 and the feeding mesh belt assembly 3. The agricultural products are then conveyed through the first lower conveying channel to the lower end of the first transfer mesh belt assembly 4. The transfer mesh belt assembly 4 tilts and conveys the agricultural products upwards again before flipping them into the second lower conveying channel between the second grid plate 6 and the first transfer mesh belt assembly 4. Multiple push plates 9 prevent the agricultural products from rolling downwards along the tilted feeding mesh belt assembly 3 and the multiple transfer mesh belt assemblies 4, improving the efficiency of agricultural product feeding. To improve the conveying efficiency of the products, multiple guide plates 10 guide multiple agricultural products conveyed along multiple grid plates 6 to multiple transfer mesh belt assemblies 4, so that the agricultural products are more stably conveyed to the lower end of the multiple transfer mesh belt assemblies 4, improving the transfer efficiency of agricultural products between the multiple transfer mesh belt assemblies 4. The above operation is repeated until the agricultural products are conveyed to the output mesh belt assembly 5. The output mesh belt assembly 5 outputs the agricultural products to the outside of the drying box 1 through the discharge port. During the conveying process of agricultural products, the hot air blower 2 delivers hot air through the mesh holes of the feeding mesh belt assembly 3 and multiple transfer mesh belt assemblies 4 as well as the ventilation holes of multiple grid plates 6 to dry the agricultural products. Compared with the existing technology, the use of multiple inclined mesh belts lowers the feeding position, making feeding easier. Moreover, the agricultural products are conveyed on two surfaces of multiple mesh belts, increasing the drying path of the agricultural products and improving the drying efficiency. Example 2

[0024] like Figure 1 , Figure 2 , Figure 3 and Figure 6As shown, based on Embodiment 1, the hot air blower 2 includes a wind box 11, a fan 12, and a heater 13. The wind box 11 is installed on the side wall of the drying chamber 1, with an air inlet at the outer end and an air outlet at the inner end. The fan 12 and heater 13 are installed inside the wind box 11. It also includes multiple gates 14, which are vertically rotatable in the air inlet of the wind box 11 via multiple rotating shafts, and the gates 14 cooperate to close the air inlet of the wind box 11. Furthermore, it includes a stepper motor 15, a first gear 16, a second gear 17, multiple swing arms 18, and two pull rods 19. The stepper motor 15 is installed in the middle of the wind box 11. Gear 16 is concentrically mounted on the output shaft of motor 15, and gear 2 17 is rotatably mounted on air box 11. Gear 2 17 meshes with gear 16. The inner ends of multiple swing arms 18 are respectively mounted on the rotating shafts of gear 16, gear 2 17 and multiple gates 14. The inner end of one pull rod 19 is rotatably connected to the outer end of the swing arm 18 on gear 16. The outer end of one pull rod 19 is rotatably connected to the outer ends of multiple swing arms 18 on the outer side of gear 16. The inner end of another pull rod 19 is rotatably connected to the outer end of the swing arm 18 on gear 2 17. The outer end of another pull rod 19 is rotatably connected to the outer ends of multiple swing arms 18 on the outer side of gear 2 17.

[0025] Heater 13 heats the air inside the airbox 11. Fan 12 operates to input hot air into the drying chamber of drying box 1, so that the hot air dries the agricultural products. Stepper motor 15 drives gear 16 to rotate. Gear 16 meshes with gear 2 to rotate synchronously in opposite directions. This causes gear 16 and gear 2 to drive two swing arms 18 on them to drive two pull rods 19 to pull multiple swing arms 18 on the outside of gear 16 and gear 2. This causes multiple swing arms 18 on the outside to drive multiple gates 14 to rotate through multiple rotating shafts, thereby adjusting the angle of multiple gates 14 and thus adjusting the opening size of the air inlet of airbox 11, thereby adjusting the air intake volume.

[0026] It also includes a return air duct 20, multiple fins 21 and a waste discharge pipe 22. One end of the return air duct 20 is connected to the drying chamber of the drying box 1, and the other end of the return air duct 20 is connected to the interior of the air box 11. Multiple fins 21 are provided on the outer wall of the return air duct 20. When the gate 14 is opened to the interior of the air box 11, the other end of the return air duct 20 is closed. The waste discharge pipe 22 is installed at the low position of the return air duct 20.

[0027] When multiple dampers 14 open inward, one end of the return air duct 20 is closed, so that air can only enter the air box 11 through the air inlet. When multiple dampers 14 flip outward to close the air inlet of the air box 11, one end of the return air duct 20 is connected to the inside of the air box 11. At this time, the hot and humid air in the drying chamber of the drying box 1 is input into the air box 11 through the return air duct 20 to form a hot air internal circulation. When the hot and humid air is transported through the return air duct 20, multiple fins 21 increase the heat dissipation area of ​​the return air duct 20, so that most of the moisture in the hot and humid air condenses. The condensate is discharged through the drain pipe 22, improving the energy-saving effect of drying.

[0028] like Figures 1 to 6 As shown, this utility model discloses a multi-layer mesh belt type agricultural product drying device. During operation, agricultural products are first placed onto the lower end of the feeding mesh belt assembly 3 through the feeding hopper 8. The feeding mesh belt assembly 3 then tilts and conveys the agricultural products upwards into the drying chamber of the drying box 1. After reaching the upper end of the feeding mesh belt assembly 3, the agricultural products flip and enter the first lower conveying channel between the first grid plate 6 and the feeding mesh belt assembly 3. The agricultural products are then conveyed through the first lower conveying channel to the lower end of the first transfer mesh belt assembly 4. The transfer mesh belt assembly 4 then tilts and conveys the agricultural products upwards again before flipping them into the second lower conveying channel between the second grid plate 6 and the first transfer mesh belt assembly 4. This process is repeated until the agricultural products are conveyed onto the output mesh belt assembly 5, which then outputs the agricultural products through the discharge port. Outside the drying chamber 1, during the transportation of agricultural products, multiple gates 14 open inward, heater 13 heats the air inside the air box 11, and fan 12 operates to input hot air into the drying chamber of the drying chamber 1. The hot air passes through the mesh holes of the feeding mesh belt assembly 3 and multiple transfer mesh belt assemblies 4, as well as the ventilation holes of multiple grid plates 6 to dry the agricultural products. Finally, when multiple gates 14 flip outward to close the air inlet of the air box 11, one end of the return air pipe 20 connects to the inside of the air box 11. At this time, the hot and humid air in the drying chamber of the drying chamber 1 is input into the air box 11 through the return air pipe 20 to form a hot air internal circulation. When the hot and humid air is transported through the return air pipe 20, multiple fins 21 increase the heat dissipation area of ​​the return air pipe 20, so that most of the moisture in the hot and humid air condenses. The condensate is discharged through the drain pipe 22.

[0029] The main functions achieved by this utility model are:

[0030] 1. The use of multiple inclined mesh belts lowers the feeding position, making feeding easier. Moreover, agricultural products are conveyed on two surfaces of multiple mesh belts, increasing the drying path of agricultural products and improving drying efficiency.

[0031] 2. The air intake of the hot air blower 2 can be flexibly adjusted to improve the drying effect;

[0032] 3. It can switch between internal and external hot air circulation as needed to reduce energy consumption.

[0033] This utility model discloses a multi-layer mesh belt agricultural product drying device. Its installation, connection, or setting methods are all common mechanical methods, and any method that can achieve its beneficial effects can be implemented. The drying box 1, hot air blower 2, feeding mesh belt assembly 3, transfer mesh belt assembly 4, output mesh belt assembly 5, grid plate 6, drive mechanism 7, feeding hopper 8, air box 11, blower 12, heater 13, gate 14, stepper motor 15, gear one 16, gear two 17, return air pipe 20, fins 21, and residue discharge pipe 22 of this utility model are all purchased from the market. Technical personnel in this industry only need to install and operate it according to the accompanying instruction manual, without requiring any creative work from those skilled in the art.

[0034] All technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0035] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A multi-layer mesh belt agricultural product drying device, comprising a drying box (1) and a hot air blower (2), wherein the drying box (1) is provided with a drying chamber, and the hot air blower (2) is installed on the drying box (1) to deliver hot air into the drying chamber of the drying box (1); characterized in that, It also includes a feeding mesh belt assembly (3), multiple transfer mesh belt assemblies (4), an output mesh belt assembly (5), multiple grid plates (6), and a drive mechanism (7). The lower part of the right side wall of the drying box (1) is provided with a feed inlet communicating with the drying chamber, and the lower part of the left side wall of the drying box (1) is provided with a discharge outlet communicating with the drying chamber. The feeding mesh belt assembly (3) and multiple transfer mesh belt assemblies (4) are installed obliquely in the drying chamber of the drying box (1). The upper part of the feeding mesh belt assembly (3) and multiple transfer mesh belt assemblies (4) is inclined towards the discharge outlet. The lower end of the feeding mesh belt assembly (3) extends out of the feed inlet of the drying box (1). The output mesh belt assembly (5) is set horizontally, and the inner end of the output mesh belt assembly (5) is located at the bottom. Below the upper end of the transfer mesh belt assembly (4) on the left, the outer end of the output mesh belt assembly (5) extends out of the discharge port. Multiple grid plates (6) are respectively installed obliquely on the rear side of the feeding mesh belt assembly (3) and multiple transfer mesh belt assemblies (4). A lower conveying channel is set between the multiple grid plates (6) and the feeding mesh belt assembly (3) and the multiple transfer mesh belt assemblies (4). The lower ends of the multiple lower conveying channels are respectively located above the lower ends of the multiple transfer mesh belt assemblies (4) and above the inner end of the output mesh belt assembly (5). The drive mechanism (7) is installed on the drying box (1). The drive mechanism (7) drives the feeding mesh belt assembly (3), multiple transfer mesh belt assemblies (4) and output mesh belt assembly (5) to rotate.

2. The multi-layer mesh belt agricultural product drying device as described in claim 1, characterized in that, It also includes a feed hopper (8), which is installed on the feed inlet of the drying box (1), and the lower end of the feed mesh belt assembly (3) is located in the feed hopper (8).

3. The multi-layer mesh belt agricultural product drying device as described in claim 1, characterized in that, It also includes multiple push plates (9), and multiple push plates (9) are evenly installed on the feeding mesh belt assembly (3) and multiple transfer mesh belt assemblies (4).

4. The multi-layer mesh belt agricultural product drying device as described in claim 1, characterized in that, It also includes multiple guide plates (10), which are respectively installed at the lower ends of multiple grid plates (6), and the lower ends of the multiple guide plates (10) face the lower ends of multiple transfer mesh belt assemblies (4).

5. A multi-layer mesh belt agricultural product drying device as described in claim 1, characterized in that, The hot air blower (2) includes a wind box (11), a fan (12) and a heater (13). The wind box (11) is installed on the side wall of the drying box (1). An air inlet is provided at the outer end of the wind box (11), and an air outlet is provided at the inner end of the wind box (11). The fan (12) and the heater (13) are installed inside the wind box (11).

6. A multi-layer mesh belt agricultural product drying device as described in claim 5, characterized in that, It also includes multiple gates (14), which are vertically rotated and installed in the air inlet of the air box (11) through multiple rotating shafts. The multiple gates (14) cooperate to seal the air inlet of the air box (11).

7. A multi-layer mesh belt agricultural product drying device as described in claim 6, characterized in that, It also includes a stepper motor (15), gear one (16), gear two (17), multiple swing arms (18), and two pull rods (19). The stepper motor (15) is installed in the middle of the bellows (11). Gear one (16) is concentrically mounted on the output shaft of the stepper motor (15). Gear two (17) is rotatably mounted on the bellows (11) and meshes with gear one (16). The inner ends of multiple swing arms (18) are respectively mounted on gear one (16), gear two (17), and multiple pull rods (19). On the rotating shaft of the gate (14), the inner end of a lever (19) is rotatably connected to the outer end of the swing arm (18) on gear one (16), the outer end of a lever (19) is rotatably connected to the outer ends of multiple swing arms (18) on the outer side of gear one (16), the inner end of another lever (19) is rotatably connected to the outer end of the swing arm (18) on gear two (17), and the outer end of another lever (19) is rotatably connected to the outer ends of multiple swing arms (18) on the outer side of gear two (17).

8. A multi-layer mesh belt agricultural product drying device as described in claim 6, characterized in that, It also includes a return air duct (20), multiple fins (21) and a waste discharge pipe (22). One end of the return air duct (20) is connected to the drying chamber of the drying box (1), and the other end of the return air duct (20) is connected to the inside of the air box (11). Multiple fins (21) are provided on the outer wall of the return air duct (20). When the gate (14) is opened to the inside of the air box (11), the other end of the return air duct (20) is closed. The waste discharge pipe (22) is installed at the low position of the return air duct (20).

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