A drying air duct structure for a grain dryer

Abstract

This utility model relates to the field of grain dryer technology and discloses a drying air duct structure for a grain dryer, including a mounting box. A first guide cylinder is fixedly installed at the upper end of the mounting box, and a mounting cylinder is fixedly installed at the upper end of the first guide cylinder. The mounting cylinder has an internal suction structure. In this utility model, the oscillating guide disc structure arranged alternately on both sides inside the mounting box, combined with the elastic support of the bottom spring, achieves multi-stage bouncing and dispersion of materials. After the grain falls into the first guide cylinder through the expansion pipe of the feeding structure and the second guide cylinder, it collides with the surface of the tilted oscillating guide disc. Under the action of the torsion spring's restoring force and the material's impact force, it continuously oscillates slightly, causing the grain clumps to be broken up and fall in a "waterfall-like" trajectory. This dynamic guiding process significantly increases the contact area between the grain and the hot air, solving the accumulation problem caused by fixed guide plates. Combined with the meandering material falling path formed by the staggered layout, it ensures that each grain is heated evenly.

Description

Technical Field

[0001] This utility model relates to the field of grain dryer technology, and in particular to a drying air duct structure for a grain dryer. Background Technology

[0002] Traditional grain dryer duct structures generally suffer from uneven hot air distribution and insufficient heating of materials. Fixed guide vanes tend to cause grain to clump together, creating drying blind spots, with the outer layer of grain being over-dried while the inner layer retains moisture. At the same time, the short contact time between the hot airflow and the material results in low thermal energy utilization and energy waste. To address these issues, we propose a new drying duct structure for grain dryers. Utility Model Content

[0003] The present invention mainly addresses the technical problems existing in the prior art by providing a drying air duct structure for a grain dryer.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a drying duct structure for a grain dryer, comprising an installation box, a first guide cylinder fixedly installed at the upper end of the installation box, an installation cylinder fixedly installed at the upper end of the first guide cylinder, an air suction structure inside the installation cylinder, a fixed feeding structure on the side of the first guide cylinder, several movable cavities opened on the side of the installation box, several installation blocks staggered on both sides inside the installation box, an oscillating guide plate inside the movable cavity, the guide plate being an inclined plate, an installation cavity opened on the inner side of the installation box corresponding to the lower part of the guide plate, a fixed heating tube inside the installation cavity, an installation plate snapped into the installation cavity, and an air inlet at the lower position on the side of the installation box.

[0005] Preferably, a rotating column is rotatably installed inside the movable cavity, and torsion springs are fixedly installed at both ends of the rotating column. The end of the torsion spring away from the rotating column is fixed to the inner side of the movable cavity, and a guide block is fixedly installed on the side of the rotating column, and a guide plate is fixedly installed on the side of the guide block.

[0006] Preferably, a mounting block is fixedly mounted on the side of the mounting box below the guide plate, and a spring is fixedly mounted on the upper end of the mounting block.

[0007] Preferably, the suction structure includes a mounting rod installed inside the mounting cylinder, a rotary motor is fixedly mounted on the end face of the mounting rod, and a rotary fan blade is fixedly mounted on the output end of the rotary motor.

[0008] Preferably, the feeding structure includes a second guide cylinder fixedly installed on the side of the first guide cylinder. The second guide cylinder is an upwardly inclined pipe, and an expansion pipe is fixedly installed at the end of the second guide cylinder away from the first guide cylinder. The expansion pipe is a trumpet-shaped pipe.

[0009] Preferably, a conductive plate is fixedly installed on the side of the mounting plate, and guide posts are installed at equal intervals on the side of the conductive plate. The guide posts are circular columns that are inclined upwards.

[0010] Preferably, the air inlet includes a rectangular air inlet slot formed on the side of the mounting box, and a removable filter screen is provided inside the air inlet slot on the side of the mounting box. Beneficial effects

[0011] This utility model provides a drying air duct structure for a grain dryer. It has the following beneficial effects:

[0012] (1) The drying duct structure of this grain dryer, through the staggered swing guide plate structure on both sides of the mounting box, combined with the elastic support of the bottom spring, realizes the multi-stage bouncing and dispersion of materials. After the grain falls into the first guide cylinder through the expansion pipe of the feeding structure and the second guide cylinder, it collides with the surface of the tilted swing guide plate. Under the action of the torsion spring reset force and the material impact force, it continues to swing slightly, causing the grain clumps to be broken up and fall in a "waterfall" trajectory. This dynamic guiding process significantly increases the contact area between the grain and the hot air, solves the accumulation problem caused by the fixed guide plate, and, combined with the meandering material falling path formed by the staggered layout, ensures that each grain is heated evenly.

[0013] (2) The drying duct structure of this grain dryer utilizes the direct radiant heat from the heating tubes inside the mounting cavity, combined with a secondary heat exchange system consisting of a conduction plate and guide columns, to achieve tiered utilization of heat energy. The heating tubes first heat the mounting plate, and the heat is transferred to the densely arranged inclined guide columns via the metal conduction plate. When the suction structure forms a negative pressure airflow from bottom to top inside the mounting cylinder, the airflow flows sequentially through the high-temperature zone of the heating tubes and the gaps between the guide columns, and is heated multiple times. The inclined design of the guide columns prolongs the airflow residence time, increasing the inlet air temperature. At the same time, the removable filter screen at the bottom air inlet blocks impurities, ensuring the cleanliness of the airflow and the unobstructed flow of the duct. This structure enhances the penetration of hot air and improves the efficiency of moisture evaporation. Attached Figure Description

[0014] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0015] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportional relationships, or adjustments to the size, without affecting the effects and purposes that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a partial structural schematic diagram of the expansion tube of this utility model;

[0018] Figure 3 This is a partial structural diagram of the guide disk of this utility model;

[0019] Figure 4 This is a partial structural schematic diagram of the guide column of this utility model;

[0020] Figure 5 This is a partial structural diagram of the mounting block of this utility model;

[0021] Legend:

[0022] 1. Mounting box; 2. First guide tube; 3. Mounting tube; 4. Mounting rod; 5. Rotary motor; 6. Rotating fan blade; 7. Second guide tube; 8. Expanding tube; 9. Movable cavity; 10. Rotating column; 11. Guide block; 12. Guide plate; 13. Torsion spring; 14. Mounting cavity; 15. Heating element; 16. Mounting plate; 17. Conducting plate; 18. Guide column; 19. Mounting block; 20. Spring. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. 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.

[0024] like Figures 1-5As shown, a drying duct structure for a grain dryer includes a mounting box 1. A first guide cylinder 2 is fixedly mounted on the upper end of the mounting box 1, and a mounting cylinder 3 is fixedly mounted on the upper end of the first guide cylinder 2. The mounting cylinder 3 has an internal suction structure. A fixed feeding structure is provided on the side of the first guide cylinder 2. Several movable cavities 9 are opened on the side of the mounting box 1. Several mounting blocks 19 are staggered on both sides of the interior of the mounting box 1. An oscillating guide plate 12 is provided inside the movable cavity 9. The guide plate 12 is an inclined plate. The inner side of the mounting box 1 corresponds to the guide plate 12. A mounting cavity 14 is provided below the guide plate 12. A fixed heating element 15 is installed inside the mounting cavity 14. A mounting plate 16 is snapped into the mounting cavity 14. An air inlet is located on the lower side of the mounting box 1. The air inlet includes a rectangular air inlet slot on the side of the mounting box 1. A removable filter screen is installed inside the air inlet slot on the side of the mounting box 1. During use, the material falls into the first guide cylinder 2 through the feeding structure, and the movement of the material is guided by the staggered guide plates 12, allowing the material to fall smoothly. The material is evenly dispersed, and the suction structure is activated during the falling process. The airflow is guided upward by the suction structure. During the operation of the heating tube 15, the interior of the mounting box 1 is heated, and the heat is guided by the airflow to heat the material. During the heating process, the hot airflow carries away the moisture of the material to dry it. A rotating column 10 is rotatably installed inside the movable cavity 9. Torsion springs 13 are fixedly installed at both ends of the rotating column 10. The end of the torsion spring 13 away from the rotating column 10 is fixed to the inner side of the movable cavity 9. A guide block 11 is fixedly installed on the side, and a guide plate 12 is fixedly installed on the side of the guide block 11. When the material falls on the top of the guide plate 12 and separates from the top of the guide plate 12, the guide plate 12 swings. The material is dispersed and guided by the swing of the guide plate 12. A mounting block 19 is fixedly installed on the side of the mounting box 1 below the guide plate 12. A spring 20 is fixedly installed on the upper end of the mounting block 19. The upper end of the spring 20 contacts the bottom side of the guide plate 12. The guide plate 12 is constrained and supported by the spring 20 when it swings.

[0025] The suction structure includes a mounting rod 4 installed inside the mounting cylinder 3. A rotary motor 5 is fixedly installed on the end face of the mounting rod 4. A rotary fan blade 6 is fixedly installed on the output end of the rotary motor 5. When the rotary motor 5 is started, the rotary motor 5 drives the rotary fan blade 6 to rotate. The rotary fan blade 6 guides the air inside the mounting box 1 upward. The feeding structure includes a second guide cylinder 7 fixedly installed on the side of the first guide cylinder 2. The second guide cylinder 7 is an upwardly inclined pipe. An expansion pipe 8 is fixedly installed at the end of the second guide cylinder 7 away from the first guide cylinder 2. The expansion pipe 8 is a horn pipe. Material is injected into the interior of the first guide cylinder 2 through the expansion pipe 8 and the second guide cylinder 7. A conduction plate 17 is fixedly installed on the side of the mounting plate 16. Guide columns 18 are equidistantly installed on the side of the conduction plate 17. The guide columns 18 are upwardly inclined circular columns. Heat is conducted to the guide columns 18 through the mounting plate 16 and the conduction plate 17. When the airflow passes through several guide columns 18, the airflow is reheated.

[0026] The working principle of this utility model:

[0027] In use, the material falls into the first guide cylinder 2 through the feeding structure, and is then guided by the staggered guide discs 12 to ensure even dispersion during its descent. As the material falls, the suction structure is activated, guiding the airflow upwards. The heating element 15 heats the interior of the mounting box 1, and the airflow guides the heat to heat the material. During heating, the hot airflow removes moisture from the material, thus drying it. When the material falls above or from the guide discs 12... After separation above 2, the guide plate 12 swings, and the material is dispersed and guided by the swing of the guide plate 12. The upper end of the spring 20 contacts the bottom side of the guide plate 12. When the guide plate 12 swings, it is constrained and supported by the spring 20. The rotary motor 5 is started, and the rotary motor 5 drives the rotary fan blade 6 to rotate. The rotary fan blade 6 guides the air inside the mounting box 1 upward. The material is injected into the first guide cylinder 2 through the expansion pipe 8 and the second guide cylinder 7. The heat is conducted to the guide column 18 through the mounting plate 16 and the conduction plate 17. When the airflow passes through several guide columns 18, the airflow is heated again.

[0028] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A drying duct structure for a grain dryer, comprising a mounting box (1), a first guide tube (2) fixedly mounted on the upper end of the mounting box (1), and a mounting tube (3) fixedly mounted on the upper end of the first guide tube (2), characterized in that: The mounting cylinder (3) is equipped with a suction structure inside. The side of the first guide cylinder (2) is equipped with a fixed feeding structure. The side of the mounting box (1) is provided with several movable cavities (9). Several mounting blocks (19) are arranged alternately on both sides inside the mounting box (1). The movable cavity (9) is equipped with a swinging guide plate (12). The guide plate (12) is an inclined plate. The inner side of the mounting box (1) is provided with a mounting cavity (14) below the guide plate (12). The mounting cavity (14) is equipped with a fixed heating tube (15). The mounting cavity (14) is snapped with a mounting plate (16). The side of the mounting box (1) is provided with an air inlet at a lower position.

2. The drying air duct structure of a grain dryer according to claim 1, characterized in that: A rotating column (10) is rotatably installed inside the active cavity (9). Torsion springs (13) are fixedly installed at both ends of the rotating column (10). The end of the torsion spring (13) away from the rotating column (10) is fixed to the inner side of the active cavity (9). A guide block (11) is fixedly installed on the side of the rotating column (10). A guide plate (12) is fixedly installed on the side of the guide block (11).

3. The drying air duct structure of a grain dryer according to claim 1, characterized in that: An installation block (19) is fixedly installed on the side of the installation box (1) below the guide plate (12), and a spring (20) is fixedly installed on the upper end of the installation block (19).

4. The drying air duct structure of a grain dryer according to claim 1, characterized in that: The suction structure includes a mounting rod (4) installed inside the mounting cylinder (3), a rotary motor (5) is fixedly installed on the end face of the mounting rod (4), and a rotary fan blade (6) is fixedly installed on the output end of the rotary motor (5).

5. The drying air duct structure of a grain dryer according to claim 1, characterized in that: The feeding structure includes a second guide cylinder (7) fixedly installed on the side of the first guide cylinder (2). The second guide cylinder (7) is an upward inclined pipe. An expansion pipe (8) is fixedly installed at the end of the second guide cylinder (7) away from the first guide cylinder (2). The expansion pipe (8) is a horn pipe.

6. The drying air duct structure of a grain dryer according to claim 1, characterized in that: A transmission plate (17) is fixedly installed on the side of the mounting plate (16), and guide posts (18) are installed at equal intervals on the side of the transmission plate (17). The guide posts (18) are circular posts that are inclined upward.

7. The drying air duct structure of a grain dryer according to claim 1, characterized in that: The air inlet includes a rectangular air inlet slot on the side of the mounting box (1), and a removable filter screen is provided inside the air inlet slot on the side of the mounting box (1).

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