Grain drying and blowing device with flow control

Abstract

The application discloses a grain drying air supply device with flow control, and relates to the technical field of grain drying air supply. In order to improve the drying efficiency, the grain drying air supply device comprises an outer cylinder, a fan assembly and an air supply part. The air supply part comprises an adjusting cylinder which is fixed to one end of the outer cylinder and has a tapered tube embedded in the inner wall of a through hole formed in the outer wall of one side of the adjusting cylinder. A heating cylinder is threadedly connected to one end of the tapered tube. An adapter column is movably connected to the inner wall of a through hole formed in the inner surface of the heating cylinder. The tapered tube is arranged in a tapered structure. When air moves from the tail end of the tapered tube to the head end of the tapered tube, the opening of the tapered tube gradually decreases, so that the air flow rate is accelerated. After the air enters the heating cylinder, the air splashes in all directions when the air with a high flow rate collides with the surface of the outermost stirring blade, so that the air heating efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of grain drying air supply technology, and in particular to a grain drying air supply device with flow control. Background Technology

[0002] In the prior art, a dryer is a device used for large-scale drying of grains. When using a dryer, an air supply device is used to heat the outside air before introducing it into the dryer. In order to improve the drying effect, the air supply volume per unit time, i.e., the air flow rate, needs to be controlled during the air supply process. At the same time, it is necessary to ensure that the hot air is evenly delivered into the dryer so as to achieve uniform heating of the grain and avoid uneven heating. This application optimizes the air supply device in the prior art to achieve the above functions.

[0003] A search revealed Chinese patent application number 202022325807.6, which discloses an intelligent air supply device for a grain dryer. The device includes a housing and a locking assembly. A fan is fixedly mounted on the inner wall of one side of the housing. An air inlet pipe is connected to the top of one side of the housing, and an air outlet pipe is connected to the bottom of one side of the housing. One-way valves are connected to the inner sides of both the air inlet and outlet pipes, with the airflow directions of the two one-way valves being opposite. A fixing plate is fixedly connected to the inner side of the housing, and a dual-shaft motor is fixedly connected to the inner side of the fixing plate. A first screw is fixedly connected to the bottom end of the main shaft of the dual-shaft motor. This utility model discloses an intelligent air supply device for a grain dryer, utilizing components such as a filter screen, one-way valves, an air inlet pipe, and an air outlet pipe.

[0004] The intelligent air supply device for a grain dryer in the aforementioned patent has the following shortcomings: During the air supply process, although the size of the vent can be adjusted by using a baffle plate, the movement trajectory of the air force cannot be effectively set after passing through the vent, making it impossible for the air force to evenly fill different areas inside the dryer, thus affecting the drying efficiency. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a grain drying air supply device with flow control.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A grain drying air supply device with flow control includes an outer cylinder, a fan assembly, and an air supply section, wherein the air supply section includes:

[0008] Adjusting cylinder: It is fixed to one end of the outer cylinder, and a tapered tube is embedded in the inner wall of the through hole opened on one side of the outer wall of the adjusting cylinder;

[0009] Heating cylinder: It is connected to one end of the tapered tube by a thread;

[0010] Connecting column: It is movably connected to the inner wall of the through hole opened on the inner surface of the heating cylinder, and the connecting column is welded with a toggle rod and a toggle blade from front to back.

[0011] Hollow air plate: It is welded to one end of the heating cylinder, and the heating cylinder and the hollow air plate are connected by a through hole;

[0012] Elastic head: It is bonded to the outer surface of the hollow air plate, and the surface of the elastic head is integrally formed with pleated holes;

[0013] Mounting holes: These are located on the outer surface of the outer cylinder.

[0014] Preferably, a fan-shaped adjusting plate is fixed to the outer wall of the other side of the adjusting cylinder, a fan-shaped toothed ring is movably connected to the outer wall of one side of the fan-shaped adjusting plate, a connecting ring is fixed to the outer wall of the circumference of the adjusting cylinder through a bracket, and the side of the fan-shaped toothed ring away from the fan-shaped adjusting plate is movably connected to the outer wall of the connecting ring.

[0015] Preferably, the outer circumference of the connecting ring is fixed with a mounting ring by a bracket, and the mounting ring and the connecting ring are movably connected by the same toothed ring, and the connecting post and the toothed ring are fixed by a pin, and the inner circumference of the mounting ring is fixed with a fixing plate.

[0016] Preferably, the fan assembly includes a drive motor fixed to the outer wall of one side of the fixing plate and fan blades fixed to the output end of the drive motor by pins; a filter screen is fixed to the inner wall of the mounting ring by pins.

[0017] Preferably, the connecting ring has a horizontal plate and a mounting plate welded to its outer circumference. An electric cylinder is fixed to the top outer wall of the horizontal plate. The output end of the electric cylinder is fixed to a U-shaped frame by a pin. A rocker arm is movably connected to the inner wall of the U-shaped frame.

[0018] Preferably, a rotating column is movably connected to the inner wall of a through hole on one surface of the mounting plate, and a gear two that meshes with a gear ring is connected to the outer circumference of the rotating column via a key.

[0019] Preferably, the outer circumference of the rotating column is fixed to the drive disk by a pin, and the end of the rocker arm away from the U-shaped frame is movably connected to the outer wall of the drive disk.

[0020] Based on the aforementioned scheme: a second mounting plate is welded to the outer circumference of the connecting ring, and a receiving column is movably connected to the inner wall of the through hole opened on the surface of the second mounting plate. A gear one that meshes with a sector gear ring is connected to the outer circumference of the receiving column by a key. A coil spring is fixed to the outer circumference of the rotating column by a pin, and the end of the coil spring away from the rotating column is fixed to the inner surface of the receiving column by a pin.

[0021] A preferred embodiment based on the aforementioned scheme is as follows: a bent rod is welded to the outer circumference of the connecting ring, one end of the bent rod is fixed with an electromagnet by screws, and a rectangular plate is welded to the outer circumference of the bent rod.

[0022] A further preferred embodiment based on the aforementioned scheme is as follows: a T-shaped rod is movably connected to the inner wall of the through hole on the surface of the rectangular plate; a toothed plate is fixed to the bottom of the T-shaped rod by a pin; a spring is sleeved on the outer circumference of the T-shaped rod; and the two ends of the spring are respectively welded to the bottom outer wall of the rectangular plate and the top outer wall of the toothed plate.

[0023] The beneficial effects of this invention are as follows:

[0024] 1. By setting the conical tube to a conical structure, when air moves from the tail end to the head end of the conical tube, the opening of the conical tube gradually decreases, which can accelerate the air flow rate. As the air enters the heating cylinder, the faster-flowing air collides with the surface of the outermost actuating blade, causing the air to splash in all directions, thus making better contact with the inner surface of the heating cylinder and ensuring the heating effect.

[0025] 2. The multiple agitator blades inside the heating cylinder can extend the time for air to pass through the heating cylinder in reverse, thereby ensuring the heating effect of the air. At the same time, when the agitator blades rotate after being driven, they can also agitate the air, thereby further ensuring the contact effect between the air and the inner surface of the heating cylinder.

[0026] 3. By setting multiple elastic heads and opening multiple pleated holes on the surface of each elastic head, the heated air can be diverted to a certain extent, so that when the hot air enters the dryer, the hot air can move quickly to different areas and positions inside the dryer, thus ensuring that all parts inside the dryer can be heated evenly.

[0027] 4. By providing a toggle lever, when the head is driven to rotate, it can continuously agitate the surface of the elastic head, thereby further increasing the angle and range of hot air output after the elastic head is agitated by the toggle lever.

[0028] 5. By utilizing the connecting action of the coil spring, the rotating column can drive the receiving column and gear one to rotate synchronously during the rotation of the rotating column. This allows gear one to drive the sector gear ring to rotate, adjusting the relative opening size between the sector gear ring and the sector adjustment plate within a certain range. This allows the airflow rate per unit time to be adjusted while keeping the output power of the fan assembly constant.

[0029] 6. By incorporating an electromagnet, when the sector gear ring needs to rotate, the T-shaped rod can overcome the spring force through magnetic force. This allows the electromagnet to attract the T-shaped rod, enabling the retaining plate to detach from the surface of the sector gear ring, thus ensuring smooth rotation. Once the sector gear ring has rotated to the set angle, the electromagnet is de-energized, allowing the retaining plate to engage with the surface of the sector gear ring under the spring force, thereby limiting the movement of the sector gear ring. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the overall structure of a grain drying air supply device with flow control proposed in this invention.

[0031] Figure 2 This is a schematic diagram of the side structure of a grain drying air supply device with flow control proposed in this invention.

[0032] Figure 3 This is a schematic diagram of the overall exploded structure of a grain drying air supply device with flow control proposed in this invention.

[0033] Figure 4 This is a partial exploded structural diagram of a grain drying air supply device with flow control proposed in this invention.

[0034] Figure 5 This is an exploded structural diagram of the flow control unit of a grain drying air supply device with flow control proposed in this invention.

[0035] Figure 6 This is a schematic diagram of the overall structure of the air supply section of a grain drying air supply device with flow control proposed in this invention;

[0036] Figure 7 This is an exploded structural diagram of the air supply section of a grain drying air supply device with flow control proposed in this invention.

[0037] Figure 8 This is a schematic diagram of the side-direction structure of the air supply section of a grain drying air supply device with flow control proposed in this invention.

[0038] Figure 9 This is a schematic diagram of the internal structure of the air supply section of a grain drying air supply device with flow control proposed in this invention.

[0039] Figure 10 This is a schematic diagram of the drive unit structure of a grain drying air supply device with flow control proposed in this invention.

[0040] In the diagram: 1-Outer cylinder, 2-Adjusting cylinder, 3-Connecting ring, 4-Mounting ring, 5-Electric cylinder, 6-Bracket one, 7-Bracket two, 8-Gear ring, 9-Bent rod, 10-Horizontal plate, 11-Mounting hole, 12-Fan blade, 13-Fixing plate, 14-Filter screen, 15-Drive motor, 16-Mounting plate one, 17-Rotating column, 18-Drive disc, 19-Accommodating column, 20-Gear one, 21-Sector gear ring, 2 2-Fan-shaped adjusting plate, 23-Coil spring, 24-Mounting plate II, 25-Heating cylinder, 26-Conical tube, 27-Connecting column, 28-Actuating blade, 29-Actuating rod, 30-Hollow air plate, 31-Elastic head, 32-Pleated hole, 33-Through hole, 34-U-shaped frame, 35-Spring, 36-T-shaped rod, 37-Electromagnet, 38-Rectangular plate, 39-Gear plate, 40-Gear II, 41-Rock arm. Detailed Implementation

[0041] The technical solution of this patent will be further described in detail below with reference to specific embodiments.

[0042] The embodiments of this patent are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this patent, and should not be construed as limiting this patent.

[0043] In the description of this patent, it should be understood that the terms “center,” “upper,” “lower,” “front,” “back,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” and “outer,” etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this patent and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this patent.

[0044] In the description of this patent, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection or setting, a detachable connection or setting, or an integral connection or setting. Those skilled in the art can understand the specific meaning of the above terms in this patent according to the specific circumstances.

[0045] Example 1:

[0046] A grain drying air supply device with flow control, such as Figure 1-10 As shown, it includes an outer cylinder 1, a fan assembly, and an air supply section, wherein the air supply section includes:

[0047] Adjusting cylinder 2: It is fixed to one end of the outer cylinder 1 by bolts, and a tapered tube 26 is embedded in the inner wall of the through hole opened on one side of the outer wall of the adjusting cylinder 2.

[0048] Heating cylinder 25: It is connected to one end of tapered tube 26 by a thread;

[0049] Connecting column 27: It is rotatably connected to the inner wall of the through hole opened on the inner surface of the heating cylinder 25, and the outer circumference of the connecting column 27 is welded with a toggle rod 29 and a toggle blade 28 from front to back.

[0050] Hollow air plate 30: It is welded to one end of the heating cylinder 25, and the heating cylinder 25 and the hollow air plate 30 are connected through the through hole 33;

[0051] Elastic head 31: It is bonded to the outer surface of the hollow air plate 30, and the surface of the elastic head 31 is integrally formed with pleated holes 32.

[0052] Mounting hole 11: It is opened on the outer surface of the outer cylinder 1;

[0053] By incorporating a fan assembly, outside air can be fed into the regulating cylinder 2, and then guided into the heating cylinder 25 via the tapered tube 26. The heating cylinder 25 has a built-in heating plate, which heats the air flowing through it, thereby increasing the air temperature and drying the grain. The heating temperature of the heating cylinder 25 can be monitored by temperature sensors and other monitoring elements to ensure that the drying temperature is within a certain range, thus ensuring the drying effect of the grain.

[0054] By setting the conical tube 26 to a conical structure, when air moves from the tail end of the conical tube 26 to the head end, the opening of the conical tube 26 gradually decreases, which can accelerate the air flow rate. As the air enters the heating cylinder 25, the faster-flowing air collides with the surface of the outermost agitator blade 28, causing the air to splash in all directions, thus making better contact with the inner surface of the heating cylinder 25 and ensuring the heating effect. At the same time, the other agitator blades 28 can extend the time for the air to pass through the heating cylinder 25, thus ensuring the heating effect. When the agitator blades 28 are driven to rotate, they can also agitate the air, further ensuring the contact effect between the air and the inner surface of the heating cylinder 25.

[0055] By providing multiple elastic heads 31 and opening multiple pleated holes 32 on the surface of each elastic head 31, the heated air can be diverted to a certain extent, allowing the hot air to move quickly towards different areas and positions inside the dryer when it enters the dryer, thus ensuring that all positions inside the dryer are heated evenly. At the same time, the actuating rod 29 can continuously actuate the surface of the elastic head 31 when it is driven to rotate. Preferably, the elastic head 31 is made of rubber, which allows the elastic head 31 to further increase the angle and range of hot air output after being actuated by the actuating rod 29, ensuring the air delivery effect.

[0056] Furthermore, a sector-shaped adjusting plate 22 is fixed to one side of the outer wall of the adjusting cylinder 2 by bolts. A sector-shaped toothed ring 21 is rotatably connected to one side of the outer wall of the sector-shaped adjusting plate 22. A connecting ring 3 is fixed to the outer circumference of the adjusting cylinder 2 by bracket 6. The side of the sector-shaped toothed ring 21 away from the sector-shaped adjusting plate 22 is rotatably connected to the outer wall of the connecting ring 3. An installation ring 4 is fixed to the outer circumference of the connecting ring 3 by bracket 7. The same toothed ring 8 is rotatably connected between the installation ring 4 and the connecting ring 3. The connecting column 27 and the toothed ring 8 are fixed by pins. A fixing plate 13 is fixed to the inner circumference of the installation ring 4 by bolts.

[0057] The fan assembly includes a drive motor 15 fixed to the outer wall of one side of the fixing plate 13 by bolts and a fan blade 12 fixed to the output end of the drive motor 15 by pins; a filter screen 14 is fixed to the inner circumference of the mounting ring 4 by pins.

[0058] The drive motor 15 can drive the fan blades 12 to rotate, so that the outside air can be introduced into the air supply unit through the filter 14. The filter 14 can effectively filter and trap particulate matter in the outside air, thereby ensuring the purity of the air.

[0059] Furthermore, a transverse plate 10 and a mounting plate 16 are welded to the outer circumference of the connecting ring 3. An electric cylinder 5 is fixed to the top outer wall of the transverse plate 10 by bolts. A U-shaped frame 34 is fixed to the output end of the electric cylinder 5 by pins. A rocker arm 41 is rotatably connected to the inner wall of the U-shaped frame 34. A rotating column 17 is rotatably connected to the inner wall of the through hole on the surface of the mounting plate 16. A gear 40 that meshes with the gear ring 8 is connected to the outer circumference of the rotating column 17 by a key. A drive disk 18 is fixed to the outer circumference of the rotating column 17 by pins. The end of the rocker arm 41 away from the U-shaped frame 34 is rotatably connected to the outer wall of the drive disk 18.

[0060] The electric cylinder 5 can drive the U-shaped frame 34 to move vertically. The rocker arm 41 can convert the linear motion of the U-shaped frame 34 into the circular motion of the drive disc 18. As the drive gear 40 rotates, the rotating column 17 can drive the gear ring 8 to rotate through meshing. Finally, the gear ring 8 can drive the connecting column 27, the actuating blade 28 and the actuating rod 29 to rotate.

[0061] In this embodiment, when it is necessary to supply air to the dryer, the outer cylinder 1 is first fixed to the dryer using the mounting hole 11. Then, the fan assembly is started. The fan assembly first introduces the external air force into the regulating cylinder 2 through the filter screen 14. Then, the air force is introduced into the conical tube 26 through the regulating cylinder 2. During the continued conveying of the air force, it can be heated by the heating cylinder 25. The hot air is introduced into the elastic head 31 through the through hole 33, and finally introduced into the dryer through the pleated hole 32 to dry the grain.

[0062] During this process, the electric cylinder 5 can drive the U-shaped frame 34 to move downwards. The rocker arm 41 can convert the circular motion of the U-shaped frame 34 into the circular motion of the drive disc 18. As the drive disc 18 rotates, it can drive the gear 40 to rotate. In turn, the gear 40 can drive the gear ring 8 to rotate the connecting column 27. This allows the agitator blade 28 to effectively increase the contact area and contact effect between the air and the inner wall of the heating cylinder 25, thereby improving the efficiency of wind heating. At the same time, the agitator rod 29 can continuously agitate the elastic head 31, thereby increasing the range of movement of hot air inside the dryer, so that the grain can be heated evenly.

[0063] Example 2:

[0064] A grain drying air supply device with flow control, such as Figure 5 , Figure 10 As shown, in order to facilitate the adjustment of the air supply volume per unit time, this embodiment makes the following additions based on embodiment 1: The outer circumference of the connecting ring 3 is welded with a mounting plate 24, and the inner wall of the through hole opened on the surface of the mounting plate 24 is rotatably connected to the receiving column 19. The outer circumference of the receiving column 19 is connected by a key to a gear 20 that meshes with the sector gear ring 21. The outer circumference of the rotating column 17 is fixed with a coil spring 23 by a pin, and the end of the coil spring 23 away from the rotating column 17 is fixed to the inner surface of the receiving column 19 by a pin.

[0065] The coil spring 23 connects the rotating column 17, driving the receiving column 19 and gear 20 to rotate synchronously. This allows gear 20 to drive the sector gear ring 21 to rotate. Both the sector gear ring 21 and the sector adjustment plate 22 have fixed sector plates of the same specifications inside, and the interval angle between adjacent sector plates is the same. Thus, the rotation of the sector gear ring 21 can adjust the size of the relative opening between the sector gear ring 21 and the sector adjustment plate 22 within a certain range. This allows the airflow rate per unit time to be adjusted while keeping the output power of the fan assembly constant, enabling flexible adjustment of the airflow rate according to the specific quantity of grain.

[0066] Furthermore, a bent rod 9 is welded to the outer circumference of the connecting ring 3. An electromagnet 37 is fixed to one end of the bent rod 9 by a screw. A rectangular plate 38 is welded to the outer circumference of the bent rod 9. A T-shaped rod 36 is slidably connected to the inner wall of the through hole on the surface of the rectangular plate 38. A toothed plate 39 is fixed to the bottom of the T-shaped rod 36 by a pin. A spring 35 is sleeved on the outer circumference of the T-shaped rod 36, and the two ends of the spring 35 are respectively welded to the bottom outer wall of the rectangular plate 38 and the top outer wall of the toothed plate 39.

[0067] By incorporating an electromagnet 37, when the sector gear ring 21 needs to rotate, the T-shaped rod 36 can overcome the spring force of the spring 35 through magnetic force. This allows the electromagnet 37 to attract the T-shaped rod 36, enabling the locking plate 39 to detach from the surface of the sector gear ring 21, thus ensuring smooth rotation of the sector gear ring 21. After the sector gear ring 21 has rotated to the set angle, the electromagnet 37 is de-energized, allowing the locking plate 39 to engage with the surface of the sector gear ring 21 under the spring force of the spring 35. This locking plate 39 then acts as a limiter for the sector gear ring 21, thereby limiting the relative opening between the sector gear ring 21 and the sector adjustment plate 22. The elasticity of the coil spring 23 ensures that after gear 1 20 is limited, gear 2 40 can continue to rotate, thus preventing interference with the rotation of the actuating blade 28 and the actuating rod 29.

[0068] In this embodiment, when it is necessary to adjust the air supply volume per unit time, the gear 20 can drive the sector gear ring 21 to rotate, thereby adjusting the relative opening between the sector gear ring 21 and the sector adjustment plate 22. After the sector gear ring 21 rotates to the set angle, the toothed plate 39 can limit the sector gear ring 21, thereby limiting the air supply volume per unit time.

[0069] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A grain drying air supply device with flow control, comprising an outer cylinder (1), a fan assembly, and an air supply section, characterized in that, The air supply unit includes: Adjusting cylinder (2): It is fixed to one end of the outer cylinder (1), and a tapered tube (26) is embedded in the inner wall of the through hole opened on one side of the adjusting cylinder (2). Heating cylinder (25): It is connected to one end of tapered tube (26) by a thread; Connecting column (27): It is movably connected to the inner wall of the through hole opened on the inner surface of the heating cylinder (25), and the outer circumference of the connecting column (27) is welded with a toggle rod (29) and a toggle blade (28) from front to back. Hollow air plate (30): It is welded to one end of the heating cylinder (25), and the heating cylinder (25) and the hollow air plate (30) are connected through a through hole (33); Elastic head (31): It is bonded to the outer surface of the hollow air plate (30), and the surface of the elastic head (31) is integrally formed with pleated holes (32). Mounting hole (11): It is opened on the outer surface of the outer cylinder (1); A fan-shaped adjusting plate (22) is fixed on the outer wall of the other side of the adjusting cylinder (2). A fan-shaped toothed ring (21) is movably connected to the outer wall of one side of the fan-shaped adjusting plate (22). The fan-shaped toothed ring (21) and the fan-shaped adjusting plate (22) are both fixed with fan-shaped plates of the same specifications. The interval angle between two adjacent fan-shaped plates is the same. A connecting ring (3) is fixed to the outer wall of the circumference of the adjusting cylinder (2) through a bracket (6). The side of the fan-shaped toothed ring (21) away from the fan-shaped adjusting plate (22) is movably connected to the outer wall of the connecting ring (3). The connecting ring (3) has a horizontal plate (10) and a mounting plate (16) welded to its outer circumference. An electric cylinder (5) is fixed to the top outer wall of the horizontal plate (10). A U-shaped frame (34) is fixed to the output end of the electric cylinder (5) by a pin. A rocker arm (41) is movably connected to the inner wall of the U-shaped frame (34). The outer circumference of the connecting ring (3) is fixed with an mounting ring (4) by a bracket (7), and the mounting ring (4) and the connecting ring (3) are movably connected by the same toothed ring (8), and the connecting column (27) and the toothed ring (8) are fixed by a pin. The inner circumference of the mounting ring (4) is fixed with a fixing plate (13). A rotating column (17) is movably connected to the inner wall of the through hole opened on the surface of the mounting plate (16). The outer wall of the rotating column (17) is connected by a key to a gear (40) that meshes with the gear ring (8). The connecting ring (3) has a mounting plate two (24) welded to its outer circumference. The inner wall of the through hole on the surface of the mounting plate two (24) is movably connected to a receiving column (19). The outer circumference of the receiving column (19) is connected by a key to a gear one (20) that meshes with a sector gear ring (21). The outer circumference of the rotating column (17) is fixed with a coil spring (23) by a pin. The end of the coil spring (23) away from the rotating column (17) is fixed to the inner surface of the receiving column (19) by a pin.

2. The grain drying air supply device with flow control according to claim 1, characterized in that, The fan assembly includes a drive motor (15) fixed to the outer wall of one side of the fixed plate (13) and a fan blade (12) fixed to the output end of the drive motor (15) by a pin; a filter screen (14) is fixed to the inner wall of the mounting ring (4) by a pin.

3. A grain drying air supply device with flow control according to claim 2, characterized in that, The outer circumference of the rotating column (17) is fixed with a drive disk (18) by a pin, and the end of the rocker arm (41) away from the U-shaped frame (34) is movably connected to the outer wall of the drive disk (18).

4. A grain drying air supply device with flow control according to claim 3, characterized in that, The connecting ring (3) has a bent rod (9) welded to its outer circumference. One end of the bent rod (9) is fixed with an electromagnet (37) by screws. A rectangular plate (38) is welded to the outer circumference of the bent rod (9).

5. A grain drying air supply device with flow control according to claim 4, characterized in that, A T-shaped rod (36) is movably connected to the inner wall of the through hole opened on the surface of the rectangular plate (38). A toothed plate (39) is fixed to the bottom of the T-shaped rod (36) by a pin. A spring (35) is sleeved on the outer circumference of the T-shaped rod (36), and the two ends of the spring (35) are respectively welded to the bottom outer wall of the rectangular plate (38) and the top outer wall of the toothed plate (39).

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