Grain circulation type drying and dust removing integrated machine

Abstract

The utility model relates to the technical field of grain processing, and specifically discloses a grain circulating type drying and dust removing integrated machine, which comprises a rack, a dryer, an outer bin, an inner bin and a grain lifting assembly, an outer peripheral air supply channel is formed between the outer bin and the inner bin, and the inner bin is provided with a first air outlet part in communication with the outer peripheral air supply channel; the inner bin is internally provided with the grain lifting assembly and an air supply structure extending along a grain lifting path, and the air supply structure is provided with a second air outlet part in communication with the inner bin. The circulating hot air output by the dryer enters the outer peripheral air supply channel and the air supply structure respectively, so that the grain receives the action of the hot air from the outer peripheral area and the area where the grain lifting path is located, and the grain is dried by the hot air during the lifting process. The grain lifting assembly comprises a material conveying cylinder and a spiral conveying assembly, and the inner cavity of the material conveying cylinder constitutes the air supply channel. The device can improve the contact degree of the grain and the hot air, and improve the drying uniformity and the drying efficiency.

Description

Technical Field

[0001] This utility model relates to the field of grain processing technology, specifically a grain circulation drying and dust removal integrated machine. Background Technology

[0002] After harvesting, grains often contain high moisture content, making them prone to mold, spoilage, and insect infestation if stored directly. Therefore, grains need to be dried to reduce moisture. Existing circulating grain drying equipment can achieve grain circulation and turning during drying, increasing the drying capacity. However, the following shortcomings have been found in actual use: 1. In some drying equipment, the lifting and conveying mechanism and the mixing mechanism in the silo are usually controlled by two independent drive motors. The equipment has many parts, the overall structure is complex, the manufacturing cost is high, and the debugging of the control system is difficult. 2. Most of the mixing mechanisms rotate at the same speed, resulting in slow mixing of the grain inside the silo. This prevents the moisture inside the grain from being effectively removed. At the same time, the accumulation of hot air at the bottom of the grain for too long will cause uneven heating, resulting in poor drying effect and long drying time. Utility Model Content

[0003] To address the aforementioned issues, this application provides a grain circulation drying and dust removal integrated machine, which solves the problems of the lifting and conveying mechanism and the internal mixing mechanism typically using two independent drives, resulting in complex structures and insignificant improvements in drying efficiency.

[0004] The technical solution of this utility model is: a grain circulating drying and dust removal integrated machine, including a frame, a dryer, an outer chamber, an inner chamber and a grain lifting component. The outer chamber is located inside the frame, the inner chamber is located inside the outer chamber, an outer peripheral air supply channel is formed between the outer chamber and the inner chamber, and the inner chamber is provided with a first air outlet that connects the outer peripheral air supply channel with the interior of the inner chamber. The grain lifting component is installed inside the inner silo to form a grain lifting path that transports grain from bottom to top. The inner silo is equipped with an air supply structure extending along the height direction. The air supply structure has a second air outlet that communicates with the inner silo. The air supply structure is at least partially arranged along the grain lifting path so that at least part of the circulating hot air entering the air supply structure flows along the grain lifting direction and acts on the grain during the lifting process. Another part of the circulating hot air enters the inner silo through the second air outlet. The circulating hot air outlet of the dryer is connected to the outer peripheral air supply channel and the air supply structure, so that a part of the circulating hot air enters the inner chamber through the outer peripheral air supply channel and the first air outlet, and another part enters the air supply structure and flows along the extension direction of the grain lifting path, and at least a part of the circulating hot air enters the inner chamber through the second air outlet.

[0005] Specifically, the grain lifting assembly includes a conveying cylinder and a screw conveyor assembly. The conveying cylinder extends along the height direction of the inner silo, and the screw conveyor assembly is rotatably disposed inside the conveying cylinder. The spiral conveyor assembly includes spiral blades and a rotating shaft. The outer edge of the spiral blades rotates in contact with the inner wall of the conveying cylinder to convey the grain in the conveying cylinder from bottom to top.

[0006] Specifically, the inner cavity of the conveying cylinder forms the air supply channel of the air supply structure, and the circulating hot air outlet of the dryer is connected to the lower inner cavity of the conveying cylinder so that the circulating hot air flows from bottom to top along the inner cavity of the conveying cylinder. The second air outlet includes multiple vent holes that penetrate the side wall of the conveying cylinder, and the vent holes connect the inner cavity of the conveying cylinder with the interior of the inner chamber.

[0007] Specifically, the vent is inclined upwards, and the inclination angle of the vent relative to the center line of the feed cylinder is 30°-60°; and / or The multiple air vents are arranged linearly, spirally, or circumferentially along the feed cylinder.

[0008] Specifically, a stirring rod is provided inside the inner chamber, and a drive motor is provided on the frame. The drive motor is connected to the screw conveyor assembly and the stirring rod respectively, so as to drive the screw conveyor assembly and the stirring rod to rotate through the same drive motor.

[0009] A feeding gear is fixedly connected to the top of the rotating shaft of the screw conveyor assembly, and a first gear is fixedly connected to the output end of the drive motor. The first gear meshes with the feeding gear. The drive motor is fixedly mounted on the frame via a mounting platform.

[0010] Specifically, the conveying cylinder has a feed inlet and a discharge outlet. The feed inlet is located at the bottom of the conveying cylinder, and the discharge outlet is located at the top of the conveying cylinder, so that the grain enters the conveying cylinder through the feed inlet and is conveyed upward by the screw conveyor assembly, and then discharged into the inner silo through the discharge outlet.

[0011] Specifically, a feeding pipe is connected to the outside of the feeding cylinder, the feeding pipe is connected to the feed inlet, and the feeding pipe is installed on the frame.

[0012] The output end of the drive motor is also fixedly connected to a second gear, and the first gear and the second gear are coaxially arranged. A stirring gear is meshed on the outer side of the second gear. The stirring gear is rotatably mounted on the mounting platform and is fixedly connected to the stirring rod. The diameter of the second gear is larger than that of the first gear, and the diameter of the stirring gear is smaller than that of the feeding gear, so that the stirring rod and the screw conveyor assembly rotate at a different speed.

[0013] Specifically, a discharge valve is connected to the bottom of the inner compartment; A circulation pipe is connected to the top of the outer chamber, and the circulation pipe is connected to the air inlet of the dryer through a pipeline so that the circulating hot air discharged from the inner chamber returns to the dryer.

[0014] The beneficial effects of this utility model are as follows: (1) This utility model uses the same drive motor to drive the grain lifting component and stirring rod to achieve grain circulation lifting and internal turning, reducing the setting of independent drive units, simplifying the equipment structure, and reducing manufacturing and control costs.

[0015] (2) This utility model uses different transmission ratios to make the stirring rod and the grain lifting assembly rotate at different speeds, so that the grain can fully contact the hot air during the lifting and turning process, improve the uniformity of grain heating and drying efficiency, and help reduce grain breakage and cracking.

[0016] (3) The circulating hot air output by the dryer of this utility model enters the outer peripheral air supply channel and the air supply structure respectively. A part of the hot air enters the grain layer from the outer peripheral area of ​​the inner chamber, and another part of the hot air flows along the grain lifting direction and enters the inner chamber through the second air outlet, so that the grain can be subjected to hot air in different areas and during the lifting process, thereby improving the drying uniformity and drying efficiency. When the air supply structure is formed by the conveying cylinder, the upward flowing hot air can also blow and loosen the grain during the lifting process, reducing the possibility of grain adhesion and accumulation. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Figure 1 A schematic diagram of the external structure of a grain circulating drying and dust removal integrated machine provided by this utility model; Figure 2 A schematic diagram of the outer compartment connection of a grain circulating drying and dust removal integrated machine provided by this utility model; Figure 3 A schematic diagram of the inner chamber connection of a grain circulating drying and dust removal integrated machine provided by this utility model; Figure 4 A schematic diagram of the installation of the drive motor for a grain circulating drying and dust removal integrated machine provided by this utility model; Figure 5 A schematic diagram of the feeding gear and stirring gear assembly of a grain circulating drying and dust removal integrated machine provided by this utility model; Figure 6 A schematic diagram of the hot air flow direction of a grain circulating drying and dust removal integrated machine provided by this utility model.

[0019] In the picture: 1. Frame; 2. Outer chamber; 3. Dryer; 4. Discharge valve; 5. Feeding pipe; 6. Inner chamber; 7. Conveying cylinder; 8. Feed inlet; 9. Discharge outlet; 10. Screw conveyor assembly; 11. Drive motor; 12. Mounting platform; 13. First gear; 14. Feeding gear; 15. Second gear; 16. Agitating gear; 17. Agitating rod; 18. Protective cover; 19. Circulation pipe. Detailed Implementation

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the present utility model will be briefly introduced below in conjunction with the accompanying drawings and descriptions of the embodiments or the prior art. Obviously, the following description of the structure of the accompanying drawings is only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. It should be noted that the description of these embodiments is used to help understand this utility model, but does not constitute a limitation on this utility model.

[0021] like Figures 1-6 As shown, this embodiment provides a grain circulating drying and dust removal integrated machine, including a frame 1, a dryer 3, an outer chamber 2, an inner chamber 6, and a grain lifting assembly. The outer chamber 2 is located inside the frame 1, and the inner chamber 6 is located inside the outer chamber 2. The outer chamber 2 and the inner chamber 6 are spaced apart, thereby forming an outer peripheral air supply channel for circulating hot air flow between them.

[0022] The inner chamber 6 is provided with a first air outlet, which connects the outer peripheral air supply channel with the interior of the inner chamber 6. In this embodiment, the first air outlet can be composed of multiple air outlets provided on the side wall of the inner chamber 6. After part of the circulating hot air output from the dryer 3 enters the outer peripheral air supply channel, it enters the interior of the inner chamber 6 through the multiple air outlets, supplying hot air from the outer peripheral area of ​​the inner chamber 6 to the grain layer.

[0023] The grain lifting assembly is located inside the inner silo 6 to form a grain lifting path that transports the grain from bottom to top. The inner silo 6 also has an air supply structure extending along the height direction, which is at least partially arranged along the grain lifting path and has a second air outlet that communicates with the interior of the inner silo 6.

[0024] The circulating hot air outlet of dryer 3 is connected to both the outer peripheral air supply channel and the air supply structure. A portion of the circulating hot air output from dryer 3 enters the inner chamber 6 via the outer peripheral air supply channel and the first air outlet; another portion enters the air supply structure and flows along the grain lifting path, providing hot air to the grain during the lifting process. Simultaneously, at least a portion of the circulating hot air enters the interior of the inner chamber 6 via the second air outlet. Through these two air supply methods, the grain in both the outer peripheral area of ​​the inner chamber 6 and the area along the grain lifting path can achieve sufficient contact with the hot air.

[0025] In a preferred embodiment, the grain lifting assembly includes a conveying cylinder 7 and a screw conveyor assembly 10. The conveying cylinder 7 extends along the height direction of the inner silo 6, and the screw conveyor assembly 10 is rotatably disposed inside the conveying cylinder 7. The screw conveyor assembly 10 includes screw blades and a rotating shaft, the screw blades rotating with the rotating shaft to convey the grain entering the conveying cylinder 7 from bottom to top.

[0026] The outer edge of the spiral blade rotates in contact with the inner wall of the conveying cylinder 7, enabling the spiral blade to continuously push the grain upwards along the conveying cylinder 7 and reducing the possibility of grain, broken shells, or dust entering between the outer edge of the spiral blade and the inner wall of the conveying cylinder 7, thus preventing material trapping or accumulation. This contact and rotation does not mean that the spiral blade seals the interior of the conveying cylinder 7 axially; a grain conveying space extending along the spiral conveying direction still exists inside the conveying cylinder 7.

[0027] In this embodiment, the inner cavity of the conveying cylinder 7 also forms the air supply channel of the air supply structure, and the circulating hot air outlet of the dryer 3 is connected to the lower inner cavity of the conveying cylinder 7. After entering from the lower part of the conveying cylinder 7, the circulating hot air flows from bottom to top along the inside of the conveying cylinder 7, and acts on the grain being conveyed upward through the gaps between the grain particles and the spiral conveying area.

[0028] Multiple ventilation holes are provided through the side wall of the conveying cylinder 7, forming a second air outlet and connecting the inner cavity of the conveying cylinder 7 with the interior of the inner silo 6. As the circulating hot air flows upward along the conveying cylinder 7, part of the hot air continuously acts on the grain during the lifting process, while another part of the hot air enters the interior of the inner silo 6 through the ventilation holes, supplying hot air to the grain inside the silo from the area where the grain is lifted.

[0029] The above structure enables the conveying cylinder 7 to simultaneously perform grain lifting and hot air conveying functions. The screw conveyor assembly 10 provides mechanical lifting for the grain, while the upward-flowing hot air blows and loosens the grain, ensuring that the grain is continuously treated with hot air during the lifting process and reducing the adhesion and accumulation of damp grain inside the screw blades and conveying cylinder 7.

[0030] Furthermore, the vents can be inclined upwards, and the inclination angle of the vent axis relative to the center line of the conveying cylinder 7 can be 30°-60°. When using inclined upward vents, the hot air discharged through the vents has an upward flow component, which is beneficial for blowing and turning the nearby grain.

[0031] Multiple vents can be arranged linearly, spirally, or circumferentially according to the length, diameter, and grain processing capacity of the conveying cylinder 7. They can also be formed by combining the above arrangements to adjust the air distribution at different heights and circumferential positions of the conveying cylinder 7.

[0032] In other embodiments, the air supply structure is not limited to being formed within the inner cavity of the conveying cylinder 7. For example, the air supply structure may also include an independent air supply pipe disposed along the grain lifting path, which may be disposed inside the conveying cylinder 7, outside the conveying cylinder 7, or adjacent to the conveying cylinder 7; or, the air supply structure may include an annular air supply cavity sleeved around the periphery of the conveying cylinder 7. Accordingly, a second air outlet is disposed on the aforementioned air supply pipe or annular air supply cavity, allowing circulating hot air to flow along the grain lifting path and enter the inner silo 6. All of the above structures can form an air supply path extending along the grain lifting path while maintaining the grain lifting function.

[0033] The conveying cylinder 7 has a feed inlet 8 and a discharge outlet 9, with the feed inlet 8 located at the bottom and the discharge outlet 9 located at the top. After the grain enters the conveying cylinder 7 through the feed inlet 8, it is conveyed upward by the screw conveyor assembly 10 and discharged into the inner silo 6 through the discharge outlet 9, allowing the grain to be lifted and redistributed within the inner silo 6.

[0034] A feeding pipe 5 is connected to the outside of the feeding cylinder 7. The feeding pipe 5 is connected to the inlet 8 and installed on the frame 1. The grain to be processed can enter the feeding cylinder 7 through the feeding pipe 5 and the inlet 8, and is lifted by the screw conveyor assembly 10 to the discharge port 9 before entering the inner silo 6. After feeding is completed, the inlet end of the feeding pipe 5 can be sealed according to the actual equipment structure to reduce the leakage of circulating hot air from the feeding pipe 5 to the outside.

[0035] The inner chamber 6 is also equipped with a stirring rod 17, and this embodiment also includes a drive motor 11. The drive motor 11 is connected to both the screw conveyor assembly 10 and the stirring rod 17, so that the same drive motor 11 can simultaneously drive the grain lifting assembly and the stirring rod 17. The screw conveyor assembly 10 is used to continuously lift the grain, and the stirring rod 17 is used to turn over the grain layer in the inner chamber 6, so that the grain at different positions is exchanged.

[0036] Specifically, a feeding gear 14 is fixedly connected to the top of the rotating shaft of the screw conveyor assembly 10, and a first gear 13 is fixedly connected to the output end of the drive motor 11. The first gear 13 meshes with the feeding gear 14. The drive motor 11 is fixedly mounted on the frame 1 via a mounting platform 12. When the drive motor 11 is running, the first gear 13 drives the feeding gear 14 and the screw conveyor assembly 10 to rotate continuously, thereby achieving continuous lifting of the grain.

[0037] A second gear 15 is also fixedly connected to the output end of the drive motor 11. The first gear 13 and the second gear 15 are coaxially arranged. The second gear 15 meshes with the stirring gear 16, which is rotatably mounted on the mounting platform 12 and fixedly connected to the stirring rod 17. When the drive motor 11 is running, the second gear 15 drives the stirring rod 17 to rotate through the stirring gear 16, thereby agitating the grain in the inner hopper 6.

[0038] In this embodiment, the diameter of the second gear 15 is larger than the diameter of the first gear 13, and the diameter of the stirring gear 16 is smaller than the diameter of the feeding gear 14. When the output speed of the drive motor 11 is the same, by using different transmission ratios for the two gear pairs, the rotational speed of the stirring gear 16 is greater than that of the feeding gear 14, thus creating a differential rotation between the stirring rod 17 and the screw conveyor assembly 10. The screw conveyor assembly 10 maintains a suitable rotational speed for grain lifting, while the stirring rod 17 agitates the grain layer at a higher speed, which helps to improve the contact between the hot air and the grain.

[0039] In one embodiment, a bearing may be provided between the mounting platform 12 and the stirring gear 16 to provide rotational support for the stirring gear 16. The stirring rod 17 may include multiple stirring sections arranged circumferentially or radially, which agitate the grain as the stirring rod 17 rotates; depending on the grain variety and processing requirements, the stirring section may also be equipped with inclined blades, so that the grain undergoes a certain vertical position exchange while being agitated circumferentially.

[0040] A discharge valve 4 is connected to the bottom of the inner chamber 6. After the grain reaches the predetermined drying state, the discharge valve 4 can be opened to discharge the dried grain from the inner chamber 6.

[0041] A circulation pipe 19 is connected to the top of the outer chamber 2, and the circulation pipe 19 is connected to the air inlet of the dryer 3 through a pipe. The hot air that enters the inner chamber 6 and exchanges heat with the grain flows upward and returns to the dryer 3 through the circulation pipe 19, realizing the recycling of hot air.

[0042] The dryer 3 can also be equipped with a filtration mechanism, or a filtration mechanism can be installed between the circulation pipe 19 and the dryer 3. During the process of circulating hot air returning to the dryer 3, the filtration mechanism can filter out impurities such as dust and shell fragments carried in the hot air, and separate or discharge the water vapor carried in the hot air to reduce the accumulation of impurities in the circulation air path.

[0043] A protective cover 18 can also be installed on the top of the outer compartment 2. The protective cover 18 covers the drive motor 11, the first gear 13, the feeding gear 14, the second gear 15 and the stirring gear 16 to reduce dust and broken grains from entering the transmission mechanism and to isolate and protect the gear transmission components.

[0044] In this embodiment, the grain to be dried is first fed into the conveying cylinder 7 through the feeding pipe 5 and the inlet 8, and the drive motor 11 and the dryer 3 are started. The drive motor 11 drives the screw conveyor assembly 10 to rotate through the first gear 13 and the feeding gear 14. The grain is conveyed from bottom to top along the conveying cylinder 7 and enters the inner chamber 6 through the discharge port 9. At the same time, the drive motor 11 drives the stirring rod 17 to rotate through the second gear 15 and the stirring gear 16, which turns the grain in the inner chamber 6.

[0045] The circulating hot air output from the dryer 3 is divided into at least two paths. One path enters the peripheral air supply channel between the outer chamber 2 and the inner chamber 6, and then enters the inner chamber 6 through the first air outlet. The other path enters the air supply structure and flows along the extension direction of the grain lifting path to dry the grain during the lifting process. At the same time, at least part of the hot air enters the interior of the inner chamber 6 through the second air outlet. As a result, the grain continuously changes position and undergoes continuous heat and moisture exchange during the process of tumbling, circulating, lifting, and hot air action within the chamber.

[0046] In the embodiment where the air supply structure is formed by the inner cavity of the conveying cylinder 7, the circulating hot air enters from the lower part of the conveying cylinder 7 and flows upward along the conveying cylinder 7, and is discharged into the inner hopper 6 through the vent. The upward-flowing hot air and the screw conveyor assembly 10 work together to act on the grain inside the conveying cylinder 7, so that the grain is simultaneously subjected to hot air during mechanical lifting, and the possibility of damp grain adhering to the surface of the screw blades and accumulating inside the conveying cylinder 7 can be reduced.

[0047] After exchanging heat with the grain, the circulating hot air enters the circulation pipe 19 through the upper part of the inner chamber 6 and the top area of ​​the outer chamber 2, and returns to the dryer 3. After dust removal, dehumidification, and reheating, it re-enters the outer peripheral air supply channel and air supply structure, thus forming a circulating hot air drying process. Once the grain reaches the predetermined moisture content, the drying operation is stopped and the discharge valve 4 is opened to discharge the dried grain.

[0048] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A grain circulating drying and dust removal integrated machine, comprising a frame (1), a dryer (3), an outer chamber (2), an inner chamber (6), and a grain lifting assembly, wherein the outer chamber (2) is disposed inside the frame (1), and the inner chamber (6) is disposed inside the outer chamber (2), characterized in that: An outer peripheral air supply channel is formed between the outer compartment (2) and the inner compartment (6), and the inner compartment (6) is provided with a first air outlet that connects the outer peripheral air supply channel with the interior of the inner compartment (6); The grain lifting component is installed inside the inner silo (6) to form a grain lifting path that transports grain from bottom to top; The inner chamber (6) is provided with an air supply structure extending along the height direction. The air supply structure is provided with a second air outlet that communicates with the interior of the inner chamber (6). The air supply structure is at least partially arranged along the grain lifting path so that at least part of the circulating hot air entering the air supply structure flows along the grain lifting direction and acts on the grain during the lifting process. Another part of the circulating hot air enters the interior of the inner chamber (6) through the second air outlet. The circulating hot air outlet of the dryer (3) is connected to the outer peripheral air supply channel and the air supply structure, so that a part of the circulating hot air enters the inner chamber (6) through the outer peripheral air supply channel and the first air outlet, and another part enters the air supply structure and flows along the extension direction of the grain lifting path, and at least a part of the circulating hot air enters the inner chamber (6) through the second air outlet.

2. The integrated grain circulating drying and dust removal machine as described in claim 1, characterized in that: The grain lifting assembly includes a conveying cylinder (7) and a screw conveyor assembly (10). The conveying cylinder (7) extends along the height direction of the inner silo (6), and the screw conveyor assembly (10) is rotatably disposed inside the conveying cylinder (7). The spiral conveying assembly (10) includes spiral blades and a rotating shaft. The outer edge of the spiral blades rotates in contact with the inner wall of the conveying cylinder (7) to convey the grain in the conveying cylinder (7) from bottom to top.

3. The integrated grain circulating drying and dust removal machine as described in claim 2, characterized in that: The inner cavity of the conveying cylinder (7) forms the air supply channel of the air supply structure. The circulating hot air outlet of the dryer (3) is connected to the lower inner cavity of the conveying cylinder (7) so that the circulating hot air flows from bottom to top along the inner cavity of the conveying cylinder (7). The second air outlet includes multiple vent holes that penetrate the side wall of the conveying cylinder (7), and the vent holes connect the inner cavity of the conveying cylinder (7) with the interior of the inner chamber (6).

4. The integrated grain circulating drying and dust removal machine as described in claim 3, characterized in that: The vent is inclined upward, and the inclination angle of the vent relative to the center line of the feed cylinder (7) is 30°-60°; and / or The multiple air vents are arranged linearly, spirally, or circumferentially along the feed cylinder (7).

5. The integrated grain circulating drying and dust removal machine as described in claim 2, characterized in that: The inner chamber (6) is provided with a stirring rod (17), and the frame (1) is provided with a drive motor (11). The drive motor (11) is connected to the screw conveyor assembly (10) and the stirring rod (17) respectively, so as to drive the screw conveyor assembly (10) and the stirring rod (17) to rotate through the same drive motor (11).

6. The integrated grain circulating drying and dust removal machine as described in claim 5, characterized in that: The top of the rotating shaft of the spiral conveyor assembly (10) is fixedly connected to a feeding gear (14), and the output end of the drive motor (11) is fixedly connected to a first gear (13), which meshes with the feeding gear (14). The drive motor (11) is fixedly mounted on the frame (1) via the mounting platform (12).

7. The integrated grain circulating drying and dust removal machine as described in claim 2, characterized in that: The conveying cylinder (7) has a feed inlet (8) and a discharge outlet (9) through it. The feed inlet (8) is located at the lower part of the conveying cylinder (7), and the discharge outlet (9) is located at the upper part of the conveying cylinder (7), so that the grain enters the conveying cylinder (7) through the feed inlet (8) and is then conveyed upward by the screw conveyor assembly (10) and discharged into the inner silo (6) through the discharge outlet (9).

8. The integrated grain circulating drying and dust removal machine as described in claim 7, characterized in that: The feed cylinder (7) is connected to a feeding pipe (5) on the outside. The feeding pipe (5) is connected to the feed inlet (8) and the feeding pipe (5) is installed on the frame (1).

9. A grain circulating drying and dust removal integrated machine as described in claim 6, characterized in that: The output end of the drive motor (11) is also fixedly connected to a second gear (15), and the first gear (13) and the second gear (15) are coaxially arranged; A stirring gear (16) is meshed on the outer side of the second gear (15). The stirring gear (16) is rotatably mounted on the mounting platform (12), and the stirring gear (16) is fixedly connected to the stirring rod (17). The diameter of the second gear (15) is greater than that of the first gear (13), and the diameter of the stirring gear (16) is smaller than that of the feeding gear (14), so that the stirring rod (17) and the screw conveyor assembly (10) rotate at a different speed.

10. The integrated grain circulating drying and dust removal machine as described in claim 1, characterized in that: The inner compartment (6) is connected to a discharge valve (4) near the bottom. The top of the outer chamber (2) is connected to a circulation pipe (19), which is connected to the air inlet of the dryer (3) through a pipe so that the circulating hot air discharged from the inner chamber (6) returns to the dryer (3).

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