A multi-layer drying mechanism based on a grain dryer

Abstract

The utility model relates to grain drying equipment technical field discloses a multilayer drying mechanism based on grain dryer, including hot blast furnace and elevator seat, the top of hot blast furnace is provided with multilayer drying mechanism, and multilayer drying mechanism is used to carry out gradually drying to grain, the top of elevator seat is provided with inlet and outlet mechanism, and the bottom of multilayer drying mechanism is provided with circulating mechanism, the multilayer drying mechanism includes hot blast pipe, the front side bottom of hot blast pipe is communicated at the top right side of hot blast furnace, the rear side of hot blast pipe is connected with air regulator box, the rear side fixed connection of air regulator box has the fan, and the top communication of fan has the air supply pipe. In the utility model, the drying cavity formed by the slow recovery board is introduced into the two sides from the middle part of the drying bin through the hot blast, uniformly diffuses and contacts with the falling grain, realizes the uniform drying of grain, adapts the demand of different grain, improves the drying quality and efficiency, and reduces the grain breakage rate.

Description

Technical Field

[0001] This utility model relates to the field of grain drying equipment technology, and in particular to a multi-layer drying mechanism based on a grain dryer. Background Technology

[0002] As a key piece of equipment in post-harvest agricultural processing, grain dryers are mainly used in grain storage and processing. Their core function is to reduce the moisture content of grain through hot air circulation, prevent mold and spoilage, and extend the shelf life. With the development of large-scale agriculture, higher requirements are placed on the drying efficiency and grain quality assurance capabilities of dryers. Traditional dryers mostly adopt a single-channel drying mode, which makes it difficult to balance drying speed and grain integrity. Intelligent and precise drying technology has become an important direction for improving the level of post-harvest grain processing, driving the continuous optimization and upgrading of drying institutions.

[0003] The multi-layer drying mechanism of a grain dryer is the core component for achieving efficient and uniform drying. It mainly consists of a hot air conveying system, multi-layer drying chambers, and a grain flow guiding structure. The device extends the heating time of the grain through layered processing, while the guiding components ensure uniform grain flow, laying the foundation for improving drying quality.

[0004] Traditional multi-layer drying mechanisms rely on simple air ducts for hot air distribution and lack precise adjustment devices, resulting in significant differences in air volume at different locations. This leads to problems such as the upper layer being too wet and the lower layer being too scorched. Existing technologies use multiple auxiliary compartments and air intake fans to ensure that the hot air makes full contact with the grain falling from various locations inside the outer shell, thereby making the drying more uniform and faster. However, during the rapid drying process, the surface moisture evaporates much faster than the internal moisture migrates, resulting in the grain being wet inside and dry outside. This causes the grain to crack and the breakage rate to increase. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a multi-layer drying mechanism based on a grain dryer, which aims to improve the problem of cracks caused by the imbalance of grain moisture and temperature during the drying process and the increase in the breakage rate in the prior art.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a multi-layer drying mechanism based on a grain dryer, comprising a hot air furnace and a lifting machine base, wherein a multi-layer drying mechanism is provided on the top of the hot air furnace, the multi-layer drying mechanism is used to gradually dry the grain, a feeding and discharging mechanism is provided on the top of the lifting machine base, and a circulation mechanism is provided at the bottom of the multi-layer drying mechanism.

[0007] The multi-layer drying mechanism includes a hot air duct. The bottom front side of the hot air duct is connected to the top right side of the hot air furnace. The rear side of the hot air duct is connected to an air regulating box. A fan is fixedly connected to the rear side of the air regulating box. An air supply duct is connected to the top of the fan. Air inlets are connected to the upper and lower ends of the rear side of the air supply duct. The same drying chamber is fixedly connected to the rear side of the two air inlets. Multiple sag plates are fixedly connected between adjacent sides of the front and rear sides inside the drying chamber. Multiple flower-shaped tie rods are fixedly connected between adjacent sides of the two sag plates on the left and the two sag plates on the right.

[0008] As a further description of the above technical solution:

[0009] The feeding and discharging mechanism includes an elevator cylinder, the bottom of which is fixedly connected to the top of the elevator base. The top rear side of the elevator cylinder is connected to an upper grain discharge pipe. Multiple triangular grain discharge plates are fixedly connected between adjacent left and right slowing plates. The bottom of the drying chamber is fixedly connected to a lower grain hopper. The bottom of the lower grain hopper is fixedly connected to a grain distributor. The rear side of the grain distributor is connected to a lower grain discharge pipe. A support assembly is provided on the top outer side of the elevator cylinder.

[0010] As a further description of the above technical solution:

[0011] The support assembly includes a maintenance platform, the bottom of which is fixedly connected to the top of the outer side of the hoist cylinder, and triangular support frames are fixedly connected to the left and right sides of the bottom of the maintenance platform.

[0012] As a further description of the above technical solution:

[0013] The circulation mechanism includes two air chamber shells, with adjacent sides of the two air chamber shells fixedly connected to the bottom left and right sides of the outer wall of the drying chamber, respectively. The bottom front side of each of the two air chamber shells is connected to a corrugated pipe, and the other end of each of the two corrugated pipes is connected to the same circulating air duct. A dehumidification component is provided on the top front side of each air chamber shell.

[0014] As a further description of the above technical solution:

[0015] The dehumidification assembly includes two exhaust fan frames. The rear sides of the two exhaust fan frames are respectively fixedly connected to the top front side of the two air chamber shells. The front sides of the two exhaust fan frames are fixedly connected to flanges, and the front sides of the two flanges are connected to exhaust cylinders.

[0016] As a further description of the above technical solution:

[0017] The drying chamber has support legs fixedly connected to the four corners at the bottom, and a reinforcing bracket is fixedly connected to the adjacent side of each of the support legs.

[0018] As a further description of the above technical solution:

[0019] The top of the drying chamber is fixedly connected to a guardrail, and the bottom right side of the circulating air duct is connected to the left side of the hot air furnace.

[0020] As a further description of the above technical solution:

[0021] The rear sides of the two air inlets are respectively connected to the upper and lower ends of the front middle of the drying chamber. The left end of the left triangular grain discharge plate is fixedly connected to the bottom right side of the left refrigeration plate, and the right end of the right triangular grain discharge plate is fixedly connected to the bottom left side of the right refrigeration plate.

[0022] This utility model has the following beneficial effects:

[0023] 1. In this utility model, high-temperature hot air from the hot air furnace enters the air regulating box through the hot air pipe. The fan drives the hot air through the air supply pipe to the air inlet, and introduces it from the middle of the drying chamber into the drying chamber formed by the tempering plates on both sides. The hot air is evenly diffused and contacts the falling grain. The tempering plates balance the temperature and moisture of the grain. The flatness of the tempering plates is fixed and adjusted by the pull rod to prevent accumulation. This achieves uniform drying of the grain, balances moisture and temperature to reduce cracks, adapts to the needs of different grain types, ensures drying consistency, improves drying quality and efficiency, and reduces grain breakage rate.

[0024] 2. In this utility model, the grain is vertically lifted to the top of the drying chamber by the elevator cylinder, and the upper grain pipe guides the feeding. The grain falls to the bottom after passing through multiple drying mechanisms. The triangular grain discharge plate guides the grain to slide down evenly. After drying, the grain is collected by the lower grain hopper, and the grain distributor diverts it to the lower grain pipe to be transported to the designated area for discharge. This realizes automated grain feeding and discharging, smooth feeding without accumulation, and uniform and orderly discharge. It is adapted to the rhythm of the drying process, improves the overall operation efficiency, and reduces the intensity of manual operation. Attached Figure Description

[0025] Figure 1 This is a front view of a multi-layer drying mechanism based on a grain dryer proposed in this utility model;

[0026] Figure 2 This is a perspective view of a multi-layer drying mechanism based on a grain dryer proposed in this utility model;

[0027] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0028] Figure 4 This is a schematic diagram of the air regulating box of a multi-layer drying mechanism based on a grain dryer proposed in this utility model;

[0029] Figure 5This is a schematic diagram of the reinforced support structure of a multi-layer drying mechanism based on a grain dryer proposed in this utility model;

[0030] Figure 6 This is a schematic diagram of the maintenance platform of a multi-layer drying mechanism based on a grain dryer proposed in this utility model;

[0031] Figure 7 This is a schematic diagram of the tempering plate of a multi-layer drying mechanism based on a grain dryer proposed in this utility model.

[0032] Legend:

[0033] 1. Hot air furnace; 2. Multi-layer drying mechanism; 201. Hot air duct; 202. Air regulating box; 203. Fan; 204. Air supply duct; 205. Air inlet; 206. Drying silo; 207. Tempering plate; 208. Flower tie rod; 3. Elevator base; 4. Feeding and discharging mechanism; 401. Elevator cylinder; 402. Upper grain chute; 403. Triangular grain discharge plate; 404. Lower grain hopper; 405. Grain distributor; 406. Lower grain chute; 407. Support assembly; 4071. Inspection platform; 4072. Triangular support frame; 5. Circulation mechanism; 501. Air chamber shell; 502. Corrugated pipe; 503. Circulating air duct; 504. Dehumidification assembly; 5041. Exhaust air frame; 5042. Flange; 5043. Exhaust cylinder; 6. Support leg; 7. Reinforcing bracket; 8. Guardrail. Detailed Implementation

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0035] Reference Figure 1 , Figure 4 and Figure 7 The present invention provides an embodiment of a multi-layer drying mechanism based on a grain dryer, comprising a hot air furnace 1 and an elevator base 3. The top of the hot air furnace 1 is provided with a multi-layer drying mechanism 2, which is used to gradually dry the grain. The top of the elevator base 3 is provided with a feeding and discharging mechanism 4 to realize automated and continuous grain conveying to ensure uninterrupted drying operations. The bottom of the multi-layer drying mechanism 2 is provided with a circulation mechanism 5, which is used to recover the dried hot air and reduce equipment energy consumption through secondary utilization of waste heat.

[0036] The multi-layer drying mechanism 2 includes a hot air duct 201. The front bottom of the hot air duct 201 is connected to the top right side of the hot air furnace 1, introducing the high-temperature hot air generated by the hot air furnace 1 into the multi-layer drying mechanism 2. The rear side of the hot air duct 201 is connected to an air regulating box 202, which adjusts the air volume and speed of the hot air through an internal air valve structure to adapt to the drying needs of different grains. A fan 203 is fixedly connected to the rear side of the air regulating box 202, providing power output for the directional flow of hot air within the multi-layer drying mechanism 2. The top of the fan 203 is connected to an air supply duct 204, which accurately delivers the adjusted hot air to the air inlet area of ​​the drying chamber 206. The upper and lower ends of the rear side of the air supply duct 204 are both connected to air inlet interfaces 205, realizing the zoned introduction of hot air into the drying chamber 206. The rear sides of both air inlet interfaces 205 are fixedly connected to the same drying chamber 206, for grain drying. The food drying system provides a closed and insulated working space. Multiple tempering plates 207 are fixedly connected between adjacent sides of the front and rear of the drying chamber 206. This allows the grain to achieve internal and external moisture and temperature balance through heat conduction during the drying interval, thereby reducing cracking and damage. Multiple tie rods 208 are fixedly connected between adjacent sides of the two tempering plates 207 on the left and the two tempering plates 207 on the right. The tempering plates 207 are rigidly fixed and their flatness is ensured by thread adjustment, ensuring that the grain is evenly distributed without accumulation. The two tempering plates 207 on the left and the two tempering plates 207 on the right form two drying chambers. The rear sides of the two air inlets 205 are respectively connected to the upper and lower ends of the front middle of the drying chamber 206. Hot air enters from the middle of the drying chamber 206 through the air inlets 205 and disperses to the drying chambers on both sides, achieving uniform diffusion of hot air in the drying chamber and improving drying consistency.

[0037] Specifically, the grain to be dried enters from the top of the drying chamber 206. The multi-layer drying mechanism 2 is activated. The high-temperature hot air generated by the hot air furnace 1 is introduced into the air regulating box 202 through the hot air pipe 201. After the air regulating box 202 adjusts the air volume and speed through the internal air valve, the fan 203 provides power to deliver the hot air through the air supply pipe 204 to the air inlet 205. The two tempering plates 207 on the left and the two tempering plates 207 on the right form two drying chambers. The two air inlets 205 introduce hot air from the upper and lower ends of the front middle of the drying chamber 206, so that the hot air is dispersed to the drying chambers on both sides to achieve uniform diffusion and fully contact the falling grain for drying. The tempering plates 207 inside the drying chamber 206 allow the grain to balance the moisture and temperature through heat conduction during the drying interval. The tie rod 208 rigidly fixes the tempering plates 207 and adjusts the flatness to ensure that the grain is evenly distributed without accumulation, ensuring consistent drying to meet the needs of different grain types.

[0038] Reference Figure 2 , Figure 6 and Figure 7The feeding and discharging mechanism 4 includes an elevator cylinder 401, the bottom of which is fixedly connected to the top of the elevator base 3, providing a closed conveying space for vertical grain lifting and preventing grain spillage during conveying. The top rear side of the elevator cylinder 401 is connected to an upper grain conveyor pipe 402, which guides the grain conveyed by the elevator cylinder 401 to the drying chamber 206 for precise feeding. Multiple triangular grain discharge plates 403 are fixedly connected between adjacent left and right slowing plates 207 and between adjacent right slowing plates 207, guiding the grain through the triangular structure. The grain slides evenly down the surface of the slow-fall plate 207 to avoid local accumulation. The bottom of the drying chamber 206 is fixedly connected to the grain hopper 404, which collects the dried grain in the drying chamber 206 for centralized discharge. The bottom of the grain hopper 404 is fixedly connected to the grain distributor 405, which evenly distributes the grain collected in the grain hopper 404 to different conveying paths to adapt to subsequent processing needs. The rear side of the grain distributor 405 is connected to the grain chute 406, which directs the grain after it is distributed by the grain distributor 405 to the designated storage or processing area to complete the discharge process.

[0039] A support assembly 407 is provided on the top outer side of the elevator cylinder 401 to provide stable support for equipment maintenance. The support assembly 407 includes a maintenance platform 4071. The bottom of the maintenance platform 4071 is fixedly connected to the top outer side of the elevator cylinder 401, providing a safe standing platform for workers to easily maintain the top equipment. Triangular support frames 4072 are fixedly connected to the left and right sides of the bottom of the maintenance platform 4071. The stability characteristics of triangles are used to enhance the load-bearing capacity and overall structural stability of the maintenance platform 4071. The left end of the left triangular grain discharge plate 403 is fixedly connected to the bottom right side of the left sag plate 207 to ensure that the left triangular grain discharge plate 403 and the sag plate 207 are firmly connected and improve the stability of grain discharge guidance. The right end of the right triangular grain discharge plate 403 is fixedly connected to the bottom left side of the right sag plate 207 to ensure that the right triangular grain discharge plate 403 and the sag plate 207 are firmly connected and improve the stability of grain discharge guidance.

[0040] Specifically, the grain to be dried is fed into the elevator base 3. The elevator cylinder 401 vertically lifts the grain to the top of the drying chamber 206. The upper grain pipe 402 guides the grain to the drying chamber 206 to complete the feeding. During the falling process, the grain passes through multiple drying mechanisms 2 and finally falls to the bottom of the drying chamber 206. The triangular grain discharge plate 403 guides the grain to slide down evenly. After drying, the grain is collected by the lower grain hopper 404 at the bottom of the drying chamber 206. The grain distributor 405 evenly distributes the grain to the lower grain pipe 406 and transports it to the designated area to complete the discharge. The maintenance platform 4071 on the top of the elevator cylinder 401 provides an operating platform for maintenance, making it convenient for staff to maintain the equipment. At the same time, the triangular support frame 4072 at the bottom enhances the stability.

[0041] Reference Figure 2 , Figure 3 and Figure 5 The circulation mechanism 5 includes two air chamber shells 501. The adjacent sides of the two air chamber shells 501 are fixedly connected to the bottom of the left and right sides of the outer wall of the drying chamber 206, respectively, to enclose and collect the waste heat and hot air discharged from the drying chamber 206 to form a circulating airflow buffer. The bottom front side of the two air chamber shells 501 is connected to a corrugated pipe 502, which offsets the displacement stress caused by equipment vibration through flexible expansion and contraction characteristics to ensure the air duct connection is sealed. The other end of the two corrugated pipes 502 is connected to the same circulating air duct 503, which centrally transports the waste heat and hot air collected by the air chamber shells 501 to the hot air furnace 1 to achieve path guidance. The bottom right side of the circulating air duct 503 is connected to the left side of the hot air furnace 1, so that the recovered waste heat and hot air re-enters the heating system to reduce energy consumption. The top front side of the air chamber shell 501 is provided with a dehumidification component 504 to perform humidity separation treatment on the circulating hot air to avoid high humidity hot air affecting drying efficiency.

[0042] The dehumidification assembly 504 includes two exhaust air frames 5041. The rear sides of the two exhaust air frames 5041 are fixedly connected to the top front side of the two air chamber shells 501, providing a structured flow channel for the exhaust of humid air to prevent turbulence. The front sides of the two exhaust air frames 5041 are fixedly connected to flanges 5042. The exhaust air frames 5041 and the exhaust cylinder 5043 are sealed and connected by bolts to enhance the connection stability. The front sides of the two flanges 5042 are connected to the exhaust cylinder 5043, which directs the separated humid air to the outside of the equipment to reduce the humidity of the circulating hot air. The four corners of the bottom of the drying chamber 206 are fixedly connected to support legs 6, which provide vertical support for the drying chamber 206, making the chamber body off the ground for easy bottom operation and ventilation. The adjacent sides of the multiple support legs 6 are fixedly connected to reinforcing brackets 7, which form a stable support frame through horizontal rigid connection to improve the overall vibration resistance of the equipment. The top of the drying chamber 206 is fixedly connected to a guardrail 8, which provides safety protection for workers when performing top maintenance work to prevent accidental falls.

[0043] Specifically, during the grain drying process, hot air enters from the middle of the drying chamber 206, passes through the two side tempering plates 207, and after making full contact with the grain, enters the air chamber shell 501. The two air chamber shells 501 are fixed on the bottom of the left and right sides of the outer wall of the drying chamber 206, sealing and collecting the discharged waste hot air to form an air chamber. The corrugated pipe 502 uses flexible expansion and contraction to offset vibration displacement stress and ensure sealing. The circulating air pipe 503 concentrates and transports the waste hot air to the hot air furnace 1 to realize the reheating and utilization of waste heat. At the same time, the moisture generated during the drying process rises, and the dehumidification frame 5041 guides the humid air to be discharged through the dehumidification cylinder 5043 connected by the flange 5042. The bottom support leg 6 of the drying chamber 206 provides vertical support, the reinforcement bracket 7 enhances vibration resistance, and the top guardrail 8 ensures maintenance safety.

[0044] Working principle: When the drying mechanism is working, the grain is first introduced into the elevator base 3. The elevator cylinder 401 vertically lifts the grain to the top of the drying chamber 206. The upper grain chute 402 guides the grain to the drying chamber 206 to complete the feeding. The multi-layer drying mechanism 2 starts simultaneously. The high-temperature hot air generated by the hot air furnace 1 is introduced into the air regulating box 202 through the hot air pipe 201. The air regulating box 202 adjusts the air volume and speed through the internal air valve to adapt to the needs of different grains. The adjusted hot air is powered by the fan 203 and delivered to the two air inlets 205 and the two softening plates 207 on the left side through the air delivery pipe 204. Two slow-release plates 207 on the right side form two drying chambers inside the drying chamber 206. Two air inlets 205 introduce hot air from the upper and lower ends of the front middle of the drying chamber 206, so that the hot air is dispersed to both sides of the drying chamber to achieve uniform diffusion. The grain enters from the top and falls down, making full contact with the diffused hot air to dry. The slow-release plates 207 inside the drying chamber 206 allow the grain to balance moisture and temperature through heat conduction during the drying interval, reducing cracks and damage. The pull rod 208 rigidly fixes the slow-release plates 207 and adjusts the flatness to ensure that the grain is evenly distributed without accumulation, ensuring consistent drying.

[0045] Furthermore, during the falling process, the grain is continuously dried by the multi-layer drying mechanism 2 and falls to the bottom of the drying chamber 206. The triangular grain discharge plate 403 guides the grain to fall and avoids local accumulation. After drying, the grain is collected by the grain hopper 404 at the bottom of the drying chamber 206. The grain distributor 405 evenly distributes the grain to the grain discharge pipe 406 and transports it to the designated area to complete the discharge. After the hot air comes into contact with the grain, it enters the air chamber shell 501 at the bottom of the left and right sides of the outer wall of the drying chamber 206. The air chamber shell 501 is closed to collect the residual heat and hot air. The corrugated pipe 502 at the bottom of the front side is flexible and expandable to offset vibration and ensure sealing. The circulating air pipe 503 transports the residual heat and hot air to the hot air furnace 1 for reheating and reuse. The moisture is guided by the dehumidification frame 5041 and discharged through the dehumidification cylinder 5043 connected by the flange 5042.

[0046] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A multi-layer drying mechanism based on a grain dryer, comprising a hot air furnace (1) and a lifting base (3), characterized in that: The top of the hot air furnace (1) is provided with a multi-layer drying mechanism (2), which is used to gradually dry the grain. The top of the elevator base (3) is provided with a feeding and discharging mechanism (4), and the bottom of the multi-layer drying mechanism (2) is provided with a circulation mechanism (5). The multi-layer drying mechanism (2) includes a hot air pipe (201). The bottom front side of the hot air pipe (201) is connected to the top right side of the hot air furnace (1). The rear side of the hot air pipe (201) is connected to an air regulating box (202). A fan (203) is fixedly connected to the rear side of the air regulating box (202). An air supply pipe (204) is connected to the top of the fan (203). An air supply pipe (204) is connected to the upper and lower ends of the rear side of the air supply pipe (204). The rear sides of the two air supply pipes (205) are fixedly connected to the same drying chamber (206). Multiple sag plates (207) are fixedly connected between adjacent front and rear sides inside the drying chamber (206). Multiple flower pull rods (208) are fixedly connected between adjacent left and right sides of the two sag plates (207).

2. The multi-layer drying mechanism based on a grain dryer according to claim 1, characterized in that: The feeding and discharging mechanism (4) includes an elevator cylinder (401), the bottom of which is fixedly connected to the top of the elevator base (3). The top rear side of the elevator cylinder (401) is connected to an upper grain pipe (402). Multiple triangular grain discharge plates (403) are fixedly connected between the two left and right slowing plates (207). The bottom of the drying chamber (206) is fixedly connected to a lower grain hopper (404). The bottom of the lower grain hopper (404) is fixedly connected to a grain distributor (405). The rear side of the grain distributor (405) is connected to a lower grain pipe (406). A support assembly (407) is provided on the top outer side of the elevator cylinder (401).

3. A multi-layer drying mechanism based on a grain dryer according to claim 2, characterized in that: The support assembly (407) includes a maintenance platform (4071), the bottom of which is fixedly connected to the top of the outer side of the hoisting cylinder (401), and triangular support frames (4072) are fixedly connected to the left and right sides of the bottom of the maintenance platform (4071).

4. A multi-layer drying mechanism based on a grain dryer according to claim 1, characterized in that: The circulation mechanism (5) includes two air chamber shells (501). The adjacent sides of the two air chamber shells (501) are respectively fixedly connected to the bottom of the left and right sides of the outer wall of the drying chamber (206). The bottom front side of the two air chamber shells (501) is connected to a corrugated pipe (502). The other end of the two corrugated pipes (502) is connected to the same circulation air duct (503). A dehumidification component (504) is provided on the top front side of the air chamber shell (501).

5. A multi-layer drying mechanism based on a grain dryer according to claim 4, characterized in that: The dehumidification assembly (504) includes two exhaust fan frames (5041), the rear sides of the two exhaust fan frames (5041) are respectively fixedly connected to the front top of the two air chamber shells (501), and the front sides of the two exhaust fan frames (5041) are fixedly connected to flanges (5042), and the front sides of the two flanges (5042) are connected to exhaust cylinders (5043).

6. A multi-layer drying mechanism based on a grain dryer according to claim 1, characterized in that: The drying chamber (206) has four fixed support legs (6) at the bottom corners, and a reinforcing bracket (7) is fixedly connected to each adjacent side of the multiple support legs (6).

7. A multi-layer drying mechanism based on a grain dryer according to claim 4, characterized in that: The top of the drying chamber (206) is fixedly connected to a guardrail (8), and the bottom right side of the circulating air duct (503) is connected to the left side of the hot air furnace (1).

8. A multi-layer drying mechanism based on a grain dryer according to claim 2, characterized in that: The rear sides of the two air inlets (205) are respectively connected to the upper and lower ends of the front middle of the drying chamber (206). The left end of the left triangular grain discharge plate (403) is fixedly connected to the bottom right side of the left refrigeration plate (207), and the right end of the right triangular grain discharge plate (403) is fixedly connected to the bottom left side of the right refrigeration plate (207).

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