A parallel air supply multi-layer mesh belt dryer

Abstract

This utility model relates to the technical field of dryers, and in particular to a parallel air-feeding multi-layer mesh belt dryer. It achieves uniform material drying and more stable material conveying by setting multiple ventilation pipes with air outlet and support functions. The dryer includes a drying chamber, a feeding hopper, multiple mesh belt assemblies, and a hot air system. The feeding hopper is installed above the drying chamber, and the multiple mesh belt assemblies are horizontally installed in the drying chamber of the drying chamber, arranged vertically. The hot air system supplies hot air to the drying chamber of the drying chamber. The dryer also includes multiple bearing seats, multiple ventilation pipes, and multiple through holes. The bearing seats are installed on the air outlet end of the hot air system, and the ventilation pipes are rotatably installed on the bearing seats, extending into the drying chamber of the drying chamber. Each ventilation pipe supports the upper layer of the multiple mesh belt assemblies, and multiple through holes are provided on the outer wall of each ventilation pipe, connecting the ventilation pipes to the hot air system.

Description

Technical Field

[0001] This utility model relates to the technical field of dryers, and in particular to a parallel air-feeding multi-layer mesh belt dryer. Background Technology

[0002] Parallel air-supply multi-layer mesh belt dryers are commonly used drying equipment. Chinese utility model patent CN219624416U discloses a mesh belt dryer, which includes a housing. The top of the housing has an exhaust port and an air inlet, both equipped with ventilation valves. The housing contains interconnected drying chambers, a hot air passage, and a gas circulation chamber. The hot air passage is located at the bottom of the drying chamber, and the gas circulation chamber is located at one end of the drying chamber. The bottom of the gas circulation chamber has a circulating air inlet for connecting to the hot air passage. A mesh belt conveyor unit is installed inside the drying chamber. From top to bottom, the gas circulation chamber contains a circulating hot air fan, a heat pump radiator, and an electric auxiliary heater. The heat pump radiator is externally connected to a heat pump. This dryer features a simple structure, abundant heat sources, and the ability to recover waste heat.

[0003] The aforementioned mesh belt dryer uses hot air input from the bottom, allowing the hot air to pass through multiple mesh belts from bottom to top to dry the material on multiple mesh belts. This results in a large temperature difference between the bottom mesh belt and the upper mesh belt, and it does not provide any support for the mesh belt, which is not conducive to the stable transport of materials by the mesh belt. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a parallel air supply multi-layer mesh belt dryer that achieves uniform material drying and more stable material conveying by setting multiple ventilation pipes with air outlet and support functions.

[0005] This utility model discloses a parallel-flow multi-layer mesh belt dryer, comprising a drying box, a feeding hopper, multiple mesh belt assemblies, and a hot air system. The drying box contains a drying chamber. The feeding hopper is installed above the drying box, with its output end extending into the drying chamber. Multiple mesh belt assemblies are horizontally installed within the drying chamber, arranged vertically. The hot air system supplies hot air to the drying chamber. The dryer also includes multiple bearing seats, multiple ventilation pipes, and multiple through holes. The bearing seats are mounted on the air outlet of the hot air system. The ventilation pipes are rotatably mounted on the bearing seats and extend into the drying chamber, supporting the upper layers of the mesh belt assemblies. Multiple through holes are provided on the outer walls of the ventilation pipes, connecting them to the hot air system. The system features multiple ventilation pipes rotatably mounted inside the drying chamber of the drying box via multiple bearing seats. During operation, multiple mesh belt assemblies operate, conveying materials into the drying chamber of the drying box through a feeding hopper, where the materials fall onto the uppermost mesh belt assembly. The materials are conveyed by multiple mesh belt assemblies and fall layer by layer. During material conveying, the multiple ventilation pipes provide rolling support to the upper layers of the mesh belt assemblies, ensuring stable material conveying. Simultaneously, the hot air system generates hot air, which is input into the multiple ventilation pipes and output through multiple through-holes to blow and dry the materials on the multiple mesh belt assemblies. Compared to existing technologies, the hot air directly and fully contacts the multiple mesh belt assemblies, resulting in smaller temperature differences among the materials on the multiple mesh belt assemblies. Furthermore, the rolling support of the multiple ventilation pipes on the multiple mesh belt assemblies makes material conveying more stable.

[0006] The hot air system includes a fan, an air inlet duct, a heat exchange box, and multiple hot air pipes. An air inlet duct is installed on the fan's air inlet, and the fan's air outlet is connected to the input end of the heat exchange box. A heating system is installed inside the heat exchange box, and the output end of the heat exchange box is connected to the input ports of multiple hot air pipes. Multiple bearing seats are installed on multiple hot air pipes, and multiple ventilation pipes are connected to the interior of multiple hot air pipes. When the fan operates, it draws air in through the air inlet duct and inputs it into the heat exchange box. The heating system in the heat exchange box heats the air and then inputs it into the multiple hot air pipes. The multiple hot air pipes input the hot air into the multiple ventilation pipes. The technology is mature, and the hot air delivery is stable.

[0007] Preferably, the system also includes multiple partition 1, multiple partition 2, and return air ducts. The multiple partition 1 are horizontally installed within the multiple hot air ducts, each partition 1 dividing the interior of the multiple hot air ducts into an upper air inlet channel and a lower air outlet channel. The multiple partition 2 are installed on the multiple partition 1, extending into the interior of the multiple ventilation ducts and in movable contact with them. The multiple partition 2 divide the multiple ventilation ducts into upper and lower sections. The inlet end of the return air duct is connected to the lower air outlet channel of each of the multiple hot air ducts, and the outlet end of the return air duct... It is connected to the air inlet duct; the hot air output from the heat exchanger is input into the upper air inlet channel of multiple hot air ducts, and then into the upper part of multiple ventilation ducts and discharged through multiple through holes, so that the hot air blows and heats the upper layer of multiple mesh belt assemblies. At the same time, the hot and humid air in the drying chamber of the drying box enters the lower part of multiple ventilation ducts through multiple through holes on the lower side of multiple ventilation ducts, and after passing through the lower air outlet channel of multiple hot air ducts, it is drawn into the air inlet duct through the return air duct. A residual pipe is set at the bottom of the return air duct to discharge the condensed water in the return air duct, so as to realize the hot air recycling and reduce energy consumption.

[0008] Preferably, it also includes a rotating shaft and a gate. Multiple air inlets are provided on the input port of the air inlet pipe. The rotating shaft is concentrically installed on the port of the air inlet pipe. The gate is rotatably installed on the rotating shaft. Multiple openings are provided on the gate. Rotating the gate around the rotating shaft causes the multiple openings of the gate to intersect with the multiple air inlets of the air inlet pipe, thereby adjusting the size of the opening of the multiple air inlets and regulating the intake of fresh air from the outside.

[0009] Preferably, the assembly also includes two driven members, a horizontal shaft, two gears, and multiple levers. The two driven members are rotatably mounted on the side wall of the drying chamber and are connected to the mesh belt assembly. The two ends of the horizontal shaft are rotatably connected to the drying chamber. Two gears are mounted on the horizontal shaft and are connected to the two driven members respectively. Multiple levers are mounted on the horizontal shaft and contact the upper surface of the mesh belt assembly. The driven members are two-stage components consisting of a main shaft, gears, and sprockets. The chain at the edge of the mesh belt assembly meshes with the sprocket of the driven member, and the gears of the driven member mesh with the gears. When the mesh belt assembly rotates, the chain drives the driven members to rotate, and the meshing driven members drive the gears to rotate. The gears drive the horizontal shaft and multiple levers to rotate, and the multiple levers turn the material on the mesh belt assembly, making the material contact with the hot air more evenly and fully.

[0010] Preferably, it also includes a vertical rod and multiple protrusions. The feeding hopper is rotatably mounted on the drying chamber via a bracket. The vertical rod is mounted on the feeding hopper. Multiple protrusions are evenly installed around the circumference of the drive roller of the mesh belt assembly. The multiple protrusions sequentially push the vertical rod. When the drive roller of the mesh belt assembly rotates, it drives the multiple protrusions to rotate, so that the multiple protrusions sequentially push the lower end of the vertical rod, thereby causing the vertical rod to drive the feeding hopper to swing, thus preventing material from clogging the feeding hopper.

[0011] Preferably, the assembly also includes a roller frame, multiple tension rollers, a screw, and a spring. The roller frame is vertically inserted into the drying chamber, and the multiple tension rollers are rotatably mounted on the roller frame. The multiple tension rollers roll and press the lower layers of multiple mesh belt assemblies. The lower end of the screw is rotatably screwed into the drying chamber. The upper end of the spring is connected to the screw, and the lower end of the spring is connected to the roller frame. The spring force pushes the roller frame downward, and the roller frame drives the multiple tension rollers to move downward, so that the multiple tension rollers tension the lower layers of multiple mesh belt assemblies respectively. Rotating the screw adjusts the height of the screw through the thread action, thereby adjusting the pressure of the spring on the roller frame, and thus adjusting the tensioning effect of the multiple tension rollers on the multiple mesh belt assemblies.

[0012] Compared with the prior art, the beneficial effects of this utility model are: hot air comes into direct and full contact with multiple mesh belt components, making the temperature difference of the materials on the multiple mesh belt components smaller, and the multiple mesh belt components are supported by multiple ventilation pipes, making the material conveying more stable. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Figure 2 This is a front sectional view of the present invention;

[0015] Figure 3 This is a schematic diagram of the isometric structure of this utility model;

[0016] Figure 4 It is a structural diagram of the hot air system, bearing housing, ventilation pipe and through hole, etc.

[0017] Figure 5 This is a structural diagram of the bearing housing, ventilation duct, hot air duct, partition one, and partition two, etc.

[0018] Figure 6 This is a structural diagram of a hot air system and other structures;

[0019] Figure 7 yes Figure 1 A magnified schematic diagram of the structure at point A in the middle.

[0020] The following are labels in the attached diagram: 1. Drying box; 2. Feed hopper; 3. Mesh belt assembly; 4. Hot air system; 5. Bearing seat; 6. Ventilation pipe; 7. Through hole; 8. Fan; 9. Air inlet pipe; 10. Heat exchanger box; 11. Hot air pipe; 12. Partition 1; 13. Partition 2; 14. Return air pipe; 15. Rotating shaft; 16. Gate plate; 17. Driven component; 18. Horizontal shaft; 19. Gear 2; 20. Pulley; 21. Vertical rod; 22. Protrusion; 23. Roller frame; 24. Tensioning roller; 25. Screw; 26. Spring. 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

[0022] like Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 7 As shown, a parallel-flow multi-layer mesh belt dryer includes a drying box 1, a feeding hopper 2, multiple mesh belt assemblies 3, and a hot air system 4. The drying box 1 has a drying chamber inside. The feeding hopper 2 is installed above the drying box 1, with its output end extending into the drying chamber. Multiple mesh belt assemblies 3 are horizontally installed within the drying chamber of the drying box 1, arranged vertically. The hot air system 4 supplies hot air to the drying chamber of the drying box 1. The dryer also includes multiple bearing seats 5, multiple ventilation pipes 6, and multiple through holes 7. The bearing seats 5 are installed on the air outlet of the hot air system 4. The ventilation pipes 6 are rotatably installed on the bearing seats 5, extending into the drying chamber of the drying box 1. The ventilation pipes 6 support the upper layers of the multiple mesh belt assemblies 3, and the outer walls of the ventilation pipes 6... Each component is provided with multiple through holes 7, and multiple ventilation pipes 6 are connected to the hot air system 4; it also includes two driven members 17, a horizontal shaft 18, two gears 19, and multiple levers 20. The two driven members 17 are rotatably mounted on the side wall of the drying chamber 1 and are connected to the mesh belt assembly 3. The two ends of the horizontal shaft 18 are rotatably connected to the drying chamber 1. Two gears 19 are mounted on the horizontal shaft 18 and are connected to the two driven members 17 respectively. Multiple levers 20 are mounted on the horizontal shaft 18 and are in contact with the upper surface of the mesh belt assembly 3; it also includes a vertical rod 21 and multiple protrusions 22. The feeding hopper 2 is rotatably mounted on the drying chamber 1 through a bracket. The vertical rod 21 is mounted on the feeding hopper 2. Multiple protrusions 22 are evenly installed on the circumference of the drive roller of the mesh belt assembly 3. The multiple protrusions 22 sequentially actuate the vertical rod 21.

[0023] Multiple ventilation pipes 6 are rotatably installed inside the drying chamber of the drying box 1 via multiple bearing seats 5. During operation, multiple mesh belt assemblies 3 operate, conveying materials into the drying chamber of the drying box 1 through the feeding hopper 2, and the materials fall onto the uppermost mesh belt assembly 3. The materials are conveyed by the multiple mesh belt assemblies 3 and fall layer by layer. During material conveying, the multiple ventilation pipes 6 provide rolling support to the upper layers of the multiple mesh belt assemblies 3, ensuring stable material conveying. The driven component 17 is a two-stage component consisting of a main shaft, gears, and sprockets. The chain at the edge of the mesh belt assembly 3 meshes with the sprocket of the driven component 17, and the gear of the driven component 17 meshes with gear 19. When the mesh belt assembly 3 rotates, it drives the driven component 17 to rotate via the chain. The driven component 17 meshes with and drives gear 19 to rotate. The horizontal shaft 18 and multiple paddles 20 rotate, and the paddles 20 flip the material on the mesh belt assembly 3, making the material contact with the hot air more even and sufficient. When the drive roller of the mesh belt assembly 3 rotates, it drives multiple protrusions 22 to rotate, so that the multiple protrusions 22 sequentially paddle the lower end of the vertical rod 21, thereby causing the vertical rod 21 to drive the feeding hopper 2 to swing, preventing the material from clogging the feeding hopper 2. At the same time, the hot air system 4 operates to generate hot air, which is input into multiple ventilation pipes 6 and output through multiple through holes 7 to blow and dry the material on multiple mesh belt assemblies 3. Compared with the prior art, the hot air directly and fully contacts multiple mesh belt assemblies 3, making the temperature difference of the material on multiple mesh belt assemblies 3 smaller. Moreover, the multiple ventilation pipes 6 roll to support multiple mesh belt assemblies 3, making the material conveying more stable.

[0024] It also includes a roller frame 23, multiple tension rollers 24, a screw 25, and a spring 26. The roller frame 23 is vertically inserted into the drying chamber 1. The multiple tension rollers 24 are rotatably mounted on the roller frame 23. The multiple tension rollers 24 roll and press the lower layer of multiple mesh belt assemblies 3. The lower end of the screw 25 is rotatably screwed into the drying chamber 1. The upper end of the spring 26 is connected to the screw 25, and the lower end of the spring 26 is connected to the roller frame 23. The elastic force of the spring 26 pushes the roller frame 23 downward, and the roller frame 23 drives the multiple tension rollers 24 to move downward, so that the multiple tension rollers 24 respectively tension the lower layer of multiple mesh belt assemblies 3. Rotating the screw 25 adjusts the height of the screw 25 through the thread action, thereby adjusting the pressure of the spring 26 on the roller frame 23, thus adjusting the tensioning effect of the multiple tension rollers 24 on the multiple mesh belt assemblies 3. Example

[0025] like Figures 3 to 6As shown, based on Embodiment 1, the hot air system 4 includes a fan 8, an air inlet pipe 9, a heat spreader 10, and multiple hot air pipes 11. The air inlet pipe 9 is installed on the air inlet of the fan 8, and the air outlet of the fan 8 is connected to the input end of the heat spreader 10. A heating system is installed inside the heat spreader 10, and the output end of the heat spreader 10 is connected to the input ports of the multiple hot air pipes 11. Multiple bearing seats 5 are respectively installed on the multiple hot air pipes 11, and multiple ventilation pipes 6 are respectively connected to the interior of the multiple hot air pipes 11. It also includes multiple partitions 12, multiple partitions 13, and a return air pipe 14. The multiple partitions 12 are horizontally installed in the multiple hot air pipes 11, and the multiple partitions 12 respectively connect the multiple hot air pipes 11... The interior is divided into an upper air inlet channel and a lower air outlet channel. Multiple partitions 13 are installed on multiple partitions 12. The multiple partitions 13 extend into the interior of multiple ventilation pipes 6 and are in contact with the multiple ventilation pipes 6. The multiple partitions 13 divide the multiple ventilation pipes 6 into upper and lower parts. The input end of the return air pipe 14 is connected to the lower air outlet channel of multiple hot air pipes 11. The output end of the return air pipe 14 is connected to the air inlet pipe 9. It also includes a rotating shaft 15 and a gate 16. Multiple air inlet holes are provided on the input port of the air inlet pipe 9. The rotating shaft 15 is concentrically installed on the port of the air inlet pipe 9. The gate 16 is rotatably installed on the rotating shaft 15 and has multiple openings.

[0026] Rotating the gate 16 around the pivot 15 causes the multiple openings of the gate 16 to intersect with the multiple air inlets of the air inlet pipe 9, thereby adjusting the size of the openings of the multiple air inlets and regulating the intake of fresh air from the outside. The fan 8 draws in air through the air inlet pipe 9 and inputs it into the heat exchange box 10. The heating system in the heat exchange box 10 heats the air and inputs it into the upper air inlet channels of multiple hot air pipes 11, and then into the upper part of multiple ventilation pipes 6 and out through multiple through holes 7, so that the hot air blows and heats the upper layer of multiple mesh belt assemblies 3. At the same time, the hot and humid air in the drying chamber of the drying box 1 enters the lower part of multiple ventilation pipes 6 through multiple through holes 7 on the lower side of multiple ventilation pipes 6, and is then drawn into the air inlet pipe 9 through the lower air outlet channels of multiple hot air pipes 11 and the return air pipe 14. A drain pipe is set at the bottom of the return air pipe 14 to discharge the condensed water in the return air pipe 14, realizing the recycling of hot air and reducing energy consumption.

[0027] like Figures 1 to 7As shown, this utility model discloses a parallel air-feeding multi-layer mesh belt dryer. During operation, multiple mesh belt assemblies 3 operate, conveying materials into the drying chamber of the drying box 1 via the feeding hopper 2, and the materials fall onto the uppermost mesh belt assembly 3. The materials are conveyed by the multiple mesh belt assemblies 3 and fall layer by layer. During material conveying, multiple ventilation pipes 6 provide rolling support to the upper layers of the multiple mesh belt assemblies 3, ensuring stable material conveying. Simultaneously, the fan 8 draws air through the air inlet pipe 9 and inputs it into the heat exchange box 10. In the middle, the heating system in the heat exchanger 10 heats the air and inputs it into the upper air inlet channel of multiple hot air pipes 11, and then into the upper part of multiple ventilation pipes 6 and discharged through multiple through holes 7, so that the hot air blows and heats the upper layer of multiple mesh belt assemblies 3. Finally, the hot and humid air in the drying chamber of the drying box 1 enters the lower part of multiple ventilation pipes 6 through multiple through holes 7 on the lower side of multiple ventilation pipes 6, and after passing through the lower air outlet channel of multiple hot air pipes 11, it is drawn into the air inlet pipe 9 through the return air pipe 14, so as to realize the hot air recycling.

[0028] The main functions achieved by this utility model are:

[0029] 1. By setting up multiple ventilation pipes 6 with air outlet and support functions, the material is dried evenly and the material conveying is more stable;

[0030] 2. It can perform internal and external hot air circulation to reduce energy consumption;

[0031] 3. It can turn the material over, so that the material comes into more even and sufficient contact with the hot air.

[0032] This utility model discloses a parallel air-feeding multi-layer mesh belt dryer. 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, feeding hopper 2, mesh belt assembly 3, hot air system 4, bearing seat 5, ventilation pipe 6, fan 8, air inlet pipe 9, heat dissipation box 10, rotating shaft 15, driven part 17, horizontal shaft 18, gear 2 19, actuating plate 20, tension roller 24, screw 25, and spring 26 of this utility model are commercially available. 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.

[0033] 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.

[0034] 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 parallel-flow multi-layer mesh belt dryer, comprising a drying box (1), a feeding hopper (2), multiple mesh belt assemblies (3), and a hot air system (4), wherein the drying box (1) is provided with a drying chamber, the feeding hopper (2) is installed above the drying box (1), the output end of the feeding hopper (2) extends into the drying chamber of the drying box (1), multiple mesh belt assemblies (3) are horizontally installed in the drying chamber of the drying box (1), the multiple mesh belt assemblies (3) are arranged vertically, and the hot air system (4) is used to deliver hot air to the drying chamber of the drying box (1); characterized in that, It also includes multiple bearing seats (5), multiple ventilation pipes (6) and multiple through holes (7). Multiple bearing seats (5) are installed on the air outlet of the hot air system (4). Multiple ventilation pipes (6) are rotatably installed on multiple bearing seats (5). Multiple ventilation pipes (6) extend into the drying chamber of the drying box (1). Multiple ventilation pipes (6) support the upper layer of multiple mesh belt assemblies (3). Multiple through holes (7) are provided on the outer wall of multiple ventilation pipes (6). Multiple ventilation pipes (6) are connected to the hot air system (4).

2. The parallel air supply multi-tier mesh belt dryer according to claim 1, characterized in that, The hot air system (4) includes a fan (8), an air inlet pipe (9), a heat exchange box (10), and multiple hot air pipes (11). The air inlet pipe (9) is installed on the air inlet of the fan (8). The air outlet of the fan (8) is connected to the input end of the heat exchange box (10). A heating system is installed inside the heat exchange box (10). The output end of the heat exchange box (10) is connected to the input port of multiple hot air pipes (11). Multiple bearing seats (5) are installed on multiple hot air pipes (11) respectively. Multiple ventilation pipes (6) are connected to the interior of multiple hot air pipes (11) respectively.

3. A parallel air-feeding multi-layer mesh belt dryer as described in claim 2, characterized in that, It also includes multiple partitions (12), multiple partitions (13), and return air duct (14). Multiple partitions (12) are horizontally installed in multiple hot air ducts (11). Multiple partitions (12) divide the interior of multiple hot air ducts (11) into an upper air inlet channel and a lower air outlet channel. Multiple partitions (13) are installed on multiple partitions (12). Multiple partitions (13) extend into the interior of multiple ventilation ducts (6). Multiple partitions (13) are in contact with multiple ventilation ducts (6). Multiple partitions (13) divide multiple ventilation ducts (6) into an upper part and a lower part. The input end of the return air duct (14) is connected to the lower air outlet channel of multiple hot air ducts (11). The output end of the return air duct (14) is connected to the air inlet duct (9).

4. The parallel air supply multi-tier mesh belt dryer according to claim 2, wherein, It also includes a rotating shaft (15) and a gate (16). Multiple air inlets are provided on the input port of the air inlet pipe (9). The rotating shaft (15) is concentrically installed on the port of the air inlet pipe (9). The gate (16) is rotatably installed on the rotating shaft (15). Multiple openings are provided on the gate (16).

5. The parallel air supply multi-tier mesh belt dryer according to claim 1, wherein, It also includes two driven members (17), a horizontal shaft (18), two gears (19) and multiple levers (20). The two driven members (17) are rotatably mounted on the side wall of the drying box (1). The two driven members (17) are connected to the mesh belt assembly (3) for transmission. The two ends of the horizontal shaft (18) are rotatably connected to the drying box (1). Two gears (19) are mounted on the horizontal shaft (18). The two gears (19) are connected to the two driven members (17) respectively for transmission. Multiple levers (20) are mounted on the horizontal shaft (18). The multiple levers (20) are in contact with the upper surface of the mesh belt assembly (3).

6. A parallel air supply multi-tier mesh belt dryer as claimed in claim 1, characterized in that, It also includes a vertical rod (21) and multiple protrusions (22). The feeding hopper (2) is rotatably mounted on the drying box (1) via a bracket. The vertical rod (21) is mounted on the feeding hopper (2). Multiple protrusions (22) are evenly installed on the drive roller of the mesh belt assembly (3). The multiple protrusions (22) sequentially push the vertical rod (21).

7. The parallel air supply multi-tier mesh belt dryer according to claim 1, characterized in that, It also includes a roller frame (23), multiple tension rollers (24), a screw (25) and a spring (26). The roller frame (23) is vertically inserted into the drying box (1). Multiple tension rollers (24) are rotatably installed on the roller frame (23). Multiple tension rollers (24) roll and press the lower layer of multiple mesh belt assemblies (3). The lower end of the screw (25) is rotatably screwed into the drying box (1). The upper end of the spring (26) is connected to the screw (25), and the lower end of the spring (26) is connected to the roller frame (23).

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