Sectional type variable-temperature variable-air-volume circulating grain drying tower

Abstract

The invention discloses a sectional type variable-temperature variable-air-volume circulating grain drying tower which comprises a drying tower body, two separation funnels are fixed in the drying tower body and divide the interior of the drying tower body into a first-stage drying chamber, a second-stage drying chamber and a third-stage drying chamber, and heating wires are installed in the first-stage drying chamber, the second-stage drying chamber and the third-stage drying chamber correspondingly. A circulating discharging pipe and a discharging pipe which are communicated with the drying tower body are fixed to the bottom of the drying tower body, the circulating discharging pipe is connected with the circulating feeding mechanism, the upper end of the circulating feeding mechanism is connected with the drying tower body, and the differential air supply mechanism is connected with the first-stage drying chamber, the second-stage drying chamber and the third-stage drying chamber. And the dust removal mechanism is connected with the first-stage drying chamber, the second-stage drying chamber and the third-stage drying chamber. According to the invention, the tower body is divided into three stages of drying chambers through the separation funnels, and the heating wire with gradually increased power and the differential air supply mechanism with gradually increased flow are matched, so that segmented differential warm air quantity drying is realized, and the drying efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of grain drying technology, and more particularly to a segmented variable temperature and variable air volume circulating grain drying tower. Background Technology

[0002] Grain drying is a key process in agricultural production and grain storage. Its core purpose is to remove excess moisture from grains through a controlled temperature and airflow environment, reduce the risk of mold and insect infestation, ensure grain quality and storage stability, and provide suitable conditions for subsequent processing and transportation. It is widely used in the post-harvest processing of various grains such as rice, wheat, and corn.

[0003] Most grain drying equipment on the market today adopts a single temperature and air volume design. There is no clear segmented isolation structure inside the drying tower. The hot air temperature and air volume remain fixed throughout the process, which makes it difficult to adapt to the moisture evaporation pattern of "rapid precipitation of surface moisture - slow migration of internal moisture" during the grain drying process. On the one hand, high temperature and high air volume alone can easily lead to a sudden loss of surface moisture and retention of internal moisture in grains, causing cracking and splitting of the grains, which seriously affects grain quality. On the other hand, the lack of precise segmented control and circulating drying mechanisms results in poor drying uniformity, with some grains being over-dried and deteriorated, while others still not reaching a safe moisture content, leading to low drying efficiency and making it difficult to meet the needs of large-scale, high-quality grain drying. Therefore, in response to the above situation, there is an urgent need to develop a segmented temperature and air volume circulating grain drying tower that divides the tower into three drying chambers using a partitioned funnel, combined with heating wires with progressively increasing power and a differential air supply mechanism with progressively increasing flow rate, to achieve segmented differentiated temperature and air volume drying and improve drying efficiency. Furthermore, a circulating feeding mechanism can be used to achieve circulating drying of the grains. This segmented temperature and air volume circulating grain drying tower has a reasonable overall structure, is easy to operate, and balances drying effect and practicality, thus overcoming the shortcomings of current practical applications and meeting current needs. Summary of the Invention

[0004] The purpose of this invention is to provide a segmented variable temperature and variable air volume circulating grain drying tower to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: The segmented variable temperature and variable air volume circulating grain drying tower includes a drying tower body, a circulating feeding mechanism, a circulating discharge pipe, a discharge pipe, a differential air supply mechanism, a shaking mechanism, a dust removal mechanism, a dividing funnel, a dividing screen, heating wires, and temperature sensors. Two dividing funnels are fixed inside the drying tower body, dividing it into three parts: a primary drying chamber, a secondary drying chamber, and a tertiary drying chamber. These chambers are arranged sequentially from top to bottom. Heating wires are installed in each of the three drying chambers, with the heating power increasing progressively from top to bottom. Temperature sensors are also installed in each of the three drying chambers. The bottom is fixed with a circulating discharge pipe and a discharge pipe that are connected to it. The circulating discharge pipe is connected to a circulating feeding mechanism. The upper end of the circulating feeding mechanism is connected to the drying tower body. The differential air supply mechanism is connected to the first-stage drying chamber, the second-stage drying chamber, and the third-stage drying chamber. The differential air supply mechanism includes: a hot air blower, a main pipe, air nozzles, and flow valves. The hot air blower is set on the ground and is connected to the main pipe. Three air nozzles are connected to the main pipe. The three air nozzles are respectively inserted into the first-stage drying chamber, the second-stage drying chamber, and the third-stage drying chamber. Each air nozzle is equipped with a flow valve. The flow rate of the three flow valves arranged from top to bottom increases progressively. The dust removal mechanism is connected to the first-stage drying chamber, the second-stage drying chamber, and the third-stage drying chamber.

[0006] Preferably, a one-way valve is installed at the bottom of the separating funnel.

[0007] Preferably, the circulating feeding mechanism includes: a cylinder, a first feed inlet, a second feed inlet, an end cap, a first motor, a spiral auger, and a feeding pipe. The first feed inlet is located on the right side of the cylinder and is connected to the circulating discharge pipe. The second feed inlet is located on the left side of the cylinder and has an end cap detachably installed on it. The first motor is fixed to the bottom of the cylinder. The spiral auger is rotatably connected to the cylinder. The output shaft of the first motor is connected to the spiral auger via a coupling. The feeding pipe is installed at the upper end of the cylinder and is connected to the top of the drying tower.

[0008] Preferably, a first solenoid valve is installed on the circulating discharge pipe, and a second solenoid valve is installed on the discharge pipe.

[0009] Preferably, the primary drying chamber and the secondary drying chamber are each equipped with a partition net, and the shaking mechanism is installed on the top of the drying tower and connected to the two partition nets.

[0010] Preferably, the shaking mechanism includes: a ring, connecting rods, a spring, a second motor, a drive shaft, and eccentric cams. The ring is located on the upper side of the drying tower body. Two connecting rods are fixed to the lower side of the ring. The connecting rods slide through the drying tower body and the separating funnel and are fixed to the two separating nets. A spring is installed on the outer side of the connecting rods. The upper end of the spring is fixed to the ring and the lower end is fixed to the drying tower body. The second motor is fixed to the upper side of the drying tower body. The drive shaft is rotatably connected to the upper side of the drying tower body. The output shaft of the second motor is connected to the drive shaft through a coupling. Two eccentric cams are fixed on the drive shaft. The eccentric cams are in contact with the bottom of the ring.

[0011] Preferably, the partition mesh slides in contact with the drying tower body, and a sealing ring is fixed to the outer ring of the partition mesh.

[0012] Preferably, the dust removal mechanism includes: an air outlet pipe, a guide pipe, a dust collection box, an exhaust port, a top cover, and dust collection screens. There are three air outlet pipes, which are respectively inserted into the primary drying chamber, the secondary drying chamber, and the tertiary drying chamber. The three air outlet pipes are respectively connected to the guide pipes. The lower end of the guide pipes is connected to the dust collection box. An exhaust port is provided on one side of the dust collection box. The top of the dust collection box is detachably connected to the top of the dust collection box by screws. Multiple dust collection screens inserted into the dust collection box are fixed on the lower side of the top cover.

[0013] Preferably, a humidity sensor is installed on the flow guide pipe.

[0014] Preferably, a PLC controller is installed on one side of the drying tower body on the ground. The PLC controller is equipped with a display screen and operation buttons. The first solenoid valve, the second solenoid valve, the hot air blower, the second motor, the humidity sensor, the heating wire, and the temperature sensor are electrically connected to the PLC controller.

[0015] The beneficial effects of this invention are as follows: In this segmented variable temperature and variable air volume circulating grain drying tower, initially, grain is added into the cylinder through the second inlet. A first motor drives the auger to rotate, thus conveying the grain upwards. The grain falls into the drying tower through the feeding pipe. Three heating wires provide differentiated heating to the primary, secondary, and tertiary drying chambers, causing the temperature in each chamber to gradually increase. Simultaneously, hot air is delivered to the primary, secondary, and tertiary drying chambers via a hot air blower, main pipeline, and air nozzles. Three flow valves differentiate the airflow from the three air nozzles, ensuring a gradual increase in temperature within each chamber. The grain first falls into the primary drying chamber for primary drying. Furthermore, a separator increases the grain's residence time. The shaking mechanism drives the separating screen to shake up and down, so that the material falls down. Then, the material enters the secondary drying chamber for secondary drying, and then falls into the tertiary drying chamber for tertiary drying. The material then returns to the cylinder from the bottom of the tertiary drying chamber through the circulating discharge pipe. The circulating feeding mechanism then conveys the grain upward to the top of the drying tower to achieve circulating drying. At the same time, the moisture and dust in the primary, secondary and tertiary drying chambers enter the guide pipe and dust collector through the air outlet pipe. The dust in the airflow is filtered out by the dust collector and then discharged from the exhaust port. The humidity sensor sends the discharged airflow to the PLC controller in real time. When the standard is reached, the drying stops. During discharge, the first solenoid valve is closed and the second solenoid valve is opened, so that the grain is discharged from the discharge pipe. At this time, the first motor is started to ensure that the grain remaining in the cylinder is fully discharged. In summary, this invention divides the tower into three drying chambers using a partition funnel, and combines heating wires with progressively increasing power and a differential air supply mechanism with progressively increasing flow rate to achieve segmented, differentiated temperature and air volume drying, thereby improving drying efficiency. A circulating feeding mechanism enables grain circulation drying, while a partition net extends the grain's residence time, and a shaking mechanism ensures smooth material descent, guaranteeing uniform drying. The overall structure is reasonable, easy to operate, and balances drying effect with practicality. Attached Figure Description

[0016] Figure 1 This is a front structural diagram of the present invention.

[0017] Figure 2 This is a schematic diagram of the rear structure of the present invention.

[0018] Figure 3 This is an internal cross-sectional view of the drying tower body in this invention.

[0019] Figure 4 This is an internal view of the circulating feeding mechanism in this invention.

[0020] Figure 5 This is a partial structural diagram of the present invention. Figure 1 .

[0021] Figure 6 This is a partial structural diagram of the present invention. Figure 2 .

[0022] Figure 7 This is a partial structural diagram of the present invention. Figure 3 .

[0023] Figure 8 This is a partial structural diagram of the present invention. Figure 4 .

[0024] Figure 9 This is a partial structural diagram of the present invention. Figure 5 .

[0025] Figure 10 For the present invention Figure 9 A diagram illustrating the split state.

[0026] Legend: 1. Drying tower body; 101. Primary drying chamber; 102. Secondary drying chamber; 103. Tertiary drying chamber; 2. Circulating feeding mechanism; 201. Cylinder; 202. First feed inlet; 203. Second feed inlet; 204. End cover; 205. First motor; 206. Spiral auger; 207. Feeding pipe; 3. Circulating discharge pipe; 301. First solenoid valve; 4. Discharge pipe; 401. Second solenoid valve; 5. Differential air supply mechanism; 501. Hot air blower; 502. Main pipeline; 503. Air nozzle; 504. 6. Flow valve; 7. Vibration mechanism; 8. Ring; 9. Connecting rod; 10. Spring; 11. Second motor; 12. Drive shaft; 13. Eccentric cam; 14. Dust removal mechanism; 15. Air outlet duct; 16. Guide pipe; 17. Humidity sensor; 18. Dust collection box; 19. Exhaust port; 10. Top cover; 11. Dust collection screen; 22. Separating funnel; 33. One-way valve; 44. Separating screen; 55. Sealing ring; 66. Heating wire; 77. Temperature sensor; 88. PLC controller. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] Specific implementation examples are given below.

[0029] See Figures 1-10In this embodiment of the invention, the segmented variable temperature and variable air volume circulating grain drying tower includes a drying tower body 1, a circulating feeding mechanism 2, a circulating discharge pipe 3, a discharge pipe 4, a differential air supply mechanism 5, a shaking mechanism 6, a dust removal mechanism 7, a separating funnel 8, a separating mesh 9, a heating wire 10, and a temperature sensor 11. The bottom of the drying tower body 1 is funnel-shaped so that the grain can be discharged from the bottom. Two separating funnels 8 are fixed inside the drying tower body 1. A one-way valve 801 is installed at the bottom of the separating funnel 8. The one-way valve 801 ensures that the grain can only flow from top to bottom, and vice versa. The two separating funnels 8 divide the drying tower body 1 into three parts: a primary drying chamber 101, a secondary drying chamber 102, and a tertiary drying chamber 103. The primary drying chamber 101, the secondary drying chamber 102, and the tertiary drying chamber 103 are... The three drying chambers 101, 102, and 103 are arranged sequentially from top to bottom. Heating wires 10 are installed in each of these chambers, with the heating power of the three heating wires 10 increasing progressively from top to bottom. This results in a gradual increase in drying temperature within each of the three chambers, achieving multi-stage drying. Temperature sensors 11 are installed in each of these chambers to monitor the temperature in real time. Partition meshes 9 are installed in both the first and second drying chambers 101 and 102, respectively. These meshes slide in contact with the drying tower body 1, and a sealing ring 901 is fixed to the outer ring of each mesh. Through the meshes, a sealing ring 901 can be installed... To intercept the grains and increase their residence time in the primary drying chamber 101 and the secondary drying chamber 102, a shaking mechanism 6 is installed at the top of the drying tower 1 and connected to two partition nets 9. The shaking mechanism 6 drives the two partition nets 9 to shake up and down, so that the grains fall off the partition nets 9. A circulating discharge pipe 3 and a discharge pipe 4 are fixed at the bottom of the drying tower 1 and are connected to it. The circulating discharge pipe 3 is connected to the circulating feeding mechanism 2, and the upper end of the circulating feeding mechanism 2 is connected to the drying tower 1. A first solenoid valve 301 is installed on the circulating discharge pipe 3, and a second solenoid valve 401 is installed on the discharge pipe 4. During drying, the first solenoid valve 301 opens and the second solenoid valve 401 closes, and the material at the bottom of the drying tower 1 is discharged through the circulating discharge pipe. Pipe 3 enters the circulating feeding mechanism 2, which then transports the material to the top of the drying tower 1, achieving a circulating flow. After drying, the first solenoid valve 301 is closed and the second solenoid valve 401 is opened, and the dried grain is discharged from the discharge pipe 4. The differential air supply mechanism 5 is connected to the primary drying chamber 101, the secondary drying chamber 102, and the tertiary drying chamber 103. The differential air supply mechanism 5 includes a hot air blower 501, a main pipe 502, air nozzles 503, and a flow valve 504. The hot air blower 501 is located on the ground and is connected to the main pipe 502. Three air nozzles 503 are connected to the main pipe 502, and the three air nozzles 503 are respectively inserted into the primary drying chamber 101, the secondary drying chamber 102, and the tertiary drying chamber 103.Each air nozzle 503 is equipped with a flow valve 504. The three flow valves 504, arranged from top to bottom, have progressively increasing flow rates, thus increasing the volume of air in the primary drying chamber 101, secondary drying chamber 102, and tertiary drying chamber 103. The dust removal mechanism 7 is connected to the primary drying chamber 101, secondary drying chamber 102, and tertiary drying chamber 103, and is used to discharge water vapor and dust.

[0030] The circulating feeding mechanism 2 includes: a cylinder 201, a first feed inlet 202, a second feed inlet 203, an end cap 204, a first motor 205, a spiral auger 206, and a feeding pipe 207. The first feed inlet 202 is located on the right side of the cylinder 201 and is connected to the circulating discharge pipe 3. The second feed inlet 203 is located on the left side of the cylinder 201, and the end cap 204 is detachably installed on the second feed inlet 203. Initially, a person adds grain into the cylinder 201 through the second feed inlet 203. The first motor 205 is fixed to the bottom of the cylinder 201, and the spiral auger 206 is rotatably connected to the cylinder. Inside the body 201, the output shaft of the first motor 205 is connected to the screw conveyor 206 via a coupling. The feeding pipe 207 is installed at the upper end of the body 201 and connected to the top of the drying tower 1. Initially, a person adds grain into the body 201 through the second feed inlet 203. The first motor 205 drives the screw conveyor 206 to rotate, thereby conveying the grain upward. The grain falls from the feeding pipe 207 into the drying tower 1. Then, the grain falls from the bottom of the drying tower 1 and enters the first feed inlet 202 and the body 201 through the circulating discharge pipe 3. Then, the conveying continues, and so on, to achieve cyclic conveying.

[0031] The shaking mechanism 6 includes: a ring 601, connecting rods 602, a spring 603, a second motor 604, a drive shaft 605, and an eccentric cam 606. The ring 601 is located on the upper side of the drying tower body 1. Two connecting rods 602 are fixed to the lower side of the ring 601. The connecting rods 602 slide through the drying tower body 1 and the separating funnel 8 and are fixed to the two separating nets 9. A spring 603 is installed on the outer side of the connecting rods 602. The upper end of the spring 603 is fixed to the ring 601, and the lower end is fixed to the drying tower body 1. The second motor 604 is fixed to the upper side of the drying tower body 1 and drives the rotation mechanism. Shaft 605 is rotatably connected to the upper side of drying tower body 1. The output shaft of the second motor 604 is connected to the drive shaft 605 through a coupling. Two eccentric cams 606 are fixed on the drive shaft 605. The eccentric cams 606 are in contact with the bottom of the ring 601. In use, the second motor 604 drives the drive shaft 605 and the eccentric cams 606 to rotate. The rotation of the eccentric cams 606 drives the ring 601 to move up and down. The ring 601 drives the connecting rod 602 and the separator 9 to move up and down, so that the separator 9 shakes the grain up and down, making it easier for the grain to fall.

[0032] The dust removal mechanism 7 includes: an air outlet 701, a guide pipe 702, a dust collection box 703, an exhaust port 704, a top cover 705, and a dust collection screen 706. There are three air outlet ducts 701, which are respectively inserted into the primary drying chamber 101, the secondary drying chamber 102, and the tertiary drying chamber 103. Each of the three air outlet ducts 701 is connected to a guide pipe 702. A humidity sensor 7021 is installed on the guide pipe 702. The humidity sensor 7021 detects the humidity of the exhaust gas to determine whether the grain drying meets the standards. The lower part of the guide pipe 702... The end is connected to the dust collector 703. An exhaust port 704 is provided on one side of the dust collector 703. The top of the dust collector 703 is detachably connected to the top cover 705 by screws. Multiple dust collector screens 706 are fixed on the lower side of the top cover 705 and inserted into the dust collector 703. In use, the moisture and dust in the primary drying chamber 101, the secondary drying chamber 102 and the tertiary drying chamber 103 enter the guide pipe 702 and the dust collector 703 through the air outlet 701. The dust in the airflow is filtered out by the dust collector screens 706 and then discharged from the exhaust port 704.

[0033] A PLC controller 12 is installed on one side of the drying tower 1 on the ground. The PLC controller 12 is equipped with a display screen and operation buttons. The first solenoid valve 301, the second solenoid valve 401, the hot air blower 501, the second motor 604, the humidity sensor 7021, the heating wire 10, and the temperature sensor 11 are electrically connected to the PLC controller 12. The drying temperatures of the first-stage drying chamber 101, the second-stage drying chamber 102, and the third-stage drying chamber 103 are preset in the PLC controller 12. The real-time temperatures of the first-stage drying chamber 101, the second-stage drying chamber 102, and the third-stage drying chamber 103 are transmitted to the PLC controller 12 through the three temperature sensors 11. The PLC controller 12 then adjusts the heating power of the three heating wires 10 according to the real-time temperature. The PLC controller 12 is also preset with the grain humidity target value. The humidity sensor 7021 transmits the discharged airflow to the PLC controller 12 in real time. When the target value is reached, the drying stops.

[0034] Working principle: In this segmented variable temperature and air volume circulating grain drying tower, initially, grain is added to the cylinder 201 through the second inlet 203. The first motor 205 drives the auger 206 to rotate, thus conveying the grain upwards. The grain falls into the drying tower body 1 through the feeding pipe 207. Three heating wires 10 provide differentiated heating to the primary drying chamber 101, the secondary drying chamber 102, and the tertiary drying chamber 103, ensuring that the primary drying chamber 101, the secondary drying chamber 102, and the tertiary drying chamber 103 are heated accordingly. The internal temperature gradually increases. Simultaneously, hot air is delivered to the primary drying chamber 101, secondary drying chamber 102, and tertiary drying chamber 103 via hot air blower 501, main duct 502, and air nozzles 503. Three flow valves 504 differentially control the airflow of the three air nozzles 503, causing the grain volume in the primary drying chamber 101, secondary drying chamber 102, and tertiary drying chamber 103 to gradually increase. The grain first falls into the primary drying chamber 101 for primary drying. At the same time, the grain retention time is increased by the separator mesh 9. During the drying process, the shaking mechanism 6 drives the separating screen 9 to shake up and down, causing the material to fall. The material then enters the secondary drying chamber 102 for secondary drying, and then falls into the tertiary drying chamber 103 for tertiary drying. The material then returns from the bottom of the tertiary drying chamber 103 to the cylinder 201 via the circulating discharge pipe 3. The circulating feeding mechanism 2 then conveys the grain upwards to the top of the drying tower 1, achieving circulating drying. Simultaneously, the material in the primary drying chamber 101, secondary drying chamber 102, and tertiary drying chamber 103... Moisture and dust enter the guide pipe 702 and dust collection box 703 from the air outlet 701. The dust in the airflow is filtered out by the dust collection screen 706 and then discharged from the exhaust port 704. The exhaust airflow is sent to the PLC controller 12 in real time by the humidity sensor 7021. When the standard is reached, the drying stops. During discharge, the first solenoid valve 301 is closed and the second solenoid valve 401 is opened, so that the grain is discharged from the discharge pipe 4. At this time, the first motor 205 is run so that the grain remaining in the cylinder 201 can be fully discharged.

[0035] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0036] 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 segmented variable temperature and variable air volume circulating grain drying tower, characterized in that, The drying tower includes a drying tower body (1), a circulating feeding mechanism (2), a circulating discharge pipe (3), a discharge pipe (4), a differential air supply mechanism (5), a shaking mechanism (6), a dust removal mechanism (7), a dividing funnel (8), a dividing screen (9), a heating wire (10), and a temperature sensor (11). Two dividing funnels (8) are fixed inside the drying tower body (1). These two funnels (8) divide the drying tower body (1) into three parts: a primary drying chamber (101), a secondary drying chamber (102), and a tertiary drying chamber (103). The primary drying chamber... (101), the secondary drying chamber (102) and the tertiary drying chamber (103) are arranged from top to bottom. Heating wires (10) are installed in the primary drying chamber (101), the secondary drying chamber (102) and the tertiary drying chamber (103) respectively. The heating power of the three heating wires (10) arranged from top to bottom increases progressively. Temperature sensors (11) are installed in the primary drying chamber (101), the secondary drying chamber (102) and the tertiary drying chamber (103) respectively. A circulating discharge system connected to the bottom of the drying tower body (1) is fixed thereto. Pipe (3) and discharge pipe (4), the circulating discharge pipe (3) is connected to the circulating feeding mechanism (2), the upper end of the circulating feeding mechanism (2) is connected to the drying tower body (1), the differential air supply mechanism (5) is connected to the first-stage drying chamber (101), the second-stage drying chamber (102) and the third-stage drying chamber (103), the differential air supply mechanism (5) includes: hot air blower (501), main pipe (502), air nozzle (503) and flow valve (504), the hot air blower (501) is set on the ground, the hot air blower (501) The main pipe (502) is connected to the main pipe (502), which is connected to three air nozzles (503). The three air nozzles (503) are inserted into the first-stage drying chamber (101), the second-stage drying chamber (102), and the third-stage drying chamber (103), respectively. Each air nozzle (503) is equipped with a flow valve (504). The flow rate of the three flow valves (504) arranged from top to bottom increases step by step. The dust removal mechanism (7) is connected to the first-stage drying chamber (101), the second-stage drying chamber (102), and the third-stage drying chamber (103).

2. The segmented variable temperature and variable air volume circulating grain drying tower according to claim 1, characterized in that, A one-way valve (801) is installed at the bottom of the dividing funnel (8).

3. The segmented variable temperature and variable air volume circulating grain drying tower according to claim 1, characterized in that, The circulating feeding mechanism (2) includes: a cylinder (201), a first feed port (202), a second feed port (203), an end cap (204), a first motor (205), a spiral auger (206), and a feeding pipe (207). The first feed port (202) is provided on the right side of the cylinder (201) and is connected to the circulating discharge pipe (3). The second feed port (203) is provided on the left side of the cylinder (201) and the end cap (204) is detachably installed on the second feed port (203). The first motor (205) is fixed to the bottom of the cylinder (201). The spiral auger (206) is rotatably connected inside the cylinder (201). The output shaft of the first motor (205) is connected to the spiral auger (206) through a coupling. The feeding pipe (207) is installed at the upper end of the cylinder (201) and is connected to the top of the drying tower (1).

4. The segmented variable temperature and variable air volume circulating grain drying tower according to claim 3, characterized in that, The circulating discharge pipe (3) is equipped with a first solenoid valve (301), and the discharge pipe (4) is equipped with a second solenoid valve (401).

5. The segmented variable temperature and variable air volume circulating grain drying tower according to claim 4, characterized in that, The primary drying chamber (101) and the secondary drying chamber (102) are respectively equipped with partition nets (9), and the shaking mechanism (6) is installed on the top of the drying tower body (1) and connected to the two partition nets (9).

6. The segmented variable temperature and variable air volume circulating grain drying tower according to claim 5, characterized in that, The shaking mechanism (6) includes: a ring (601), a connecting rod (602), a spring (603), a second motor (604), a drive shaft (605), and an eccentric cam (606). The ring (601) is located on the upper side of the drying tower body (1). Two connecting rods (602) are fixed on the lower side of the ring (601). The connecting rods (602) slide through the drying tower body (1) and the separating funnel (8) and are fixed to the two separating nets (9). A spring (603) is installed on the outer side of the connecting rod (602). 3) The upper end of the spring (603) is fixed to the ring (601) and the lower end is fixed to the drying tower body (1). The second motor (604) is fixed to the upper side of the drying tower body (1). The drive shaft (605) is rotatably connected to the upper side of the drying tower body (1). The output shaft of the second motor (604) is connected to the drive shaft (605) through a coupling. Two eccentric cams (606) are fixed on the drive shaft (605). The eccentric cams (606) are in contact with the bottom of the ring (601).

7. The segmented variable temperature and variable air volume circulating grain drying tower according to claim 5, characterized in that, The partition mesh (9) is in sliding contact with the drying tower body (1), and a sealing ring (901) is fixed on the outer ring of the partition mesh (9).

8. The segmented variable temperature and variable air volume circulating grain drying tower according to claim 6, characterized in that, The dust removal mechanism (7) includes: an air outlet pipe (701), a guide pipe (702), a dust removal box (703), an exhaust port (704), a top cover (705), and a dust removal net (706). There are three air outlet pipes (701) which are respectively inserted into the first-stage drying chamber (101), the second-stage drying chamber (102), and the third-stage drying chamber (103). The three air outlet pipes (701) are respectively connected to the guide pipe (702). The lower end of the guide pipe (702) is connected to the dust removal box (703). An exhaust port (704) is provided on one side of the dust removal box (703). The top of the dust removal box (703) is detachably connected to the top cover (705) by screws. Multiple dust removal nets (706) inserted into the dust removal box (703) are fixed on the lower side of the top cover (705).

9. The segmented variable temperature and variable air volume circulating grain drying tower according to claim 8, characterized in that, A humidity sensor (7021) is installed on the flow guide pipe (702).

10. The segmented variable temperature and variable air volume circulating grain drying tower according to claim 9, characterized in that, A PLC controller (12) is installed on one side of the drying tower (1) on the ground. The PLC controller (12) is equipped with a display screen and operation buttons. The first solenoid valve (301), the second solenoid valve (401), the hot air blower (501), the second motor (604), the humidity sensor (7021), the heating wire (10), and the temperature sensor (11) are electrically connected to the PLC controller (12).

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