Agricultural product granule dryer and drying method for cyclically conveying material

Abstract

The application discloses a kind of agricultural product granule drying machines and drying methods of circulating conveying material, wherein a kind of agricultural product granule drying machine includes rack, drying bin, hopper, discharging device, lifting device, high-pressure fan and heating device;Multiple drying air pipes are installed in drying bin, multiple micro air outlets are arranged on drying air pipe, and 2-6 heating pipes are arranged on the outside of each drying air pipe;Hopper is installed at the lower end of drying bin, one end of discharging device is installed at the lower end of hopper, the other end of discharging device is connected with the lower end of lifting device, and the upper end of lifting device extends to the upper end of drying bin;The present application can circulate and transport agricultural product granules through discharging device and lifting device, so that agricultural product granules can be moved and dried evenly in drying bin, and the installation cost of drying bin is relatively low;The present application can adjust drying time according to the moisture content and particle size of different agricultural product granules, and can dry various agricultural product granules.

Description

Technical Field

[0001] This invention relates to the field of drying equipment technology, and in particular to an agricultural product pellet dryer and drying method that uses a circulating material conveying system. Background Technology

[0002] Drying generally refers to the process of heating wet materials and removing their moisture to obtain a solid product with a lower moisture content. Agricultural product granules such as rice, millet, peanuts, corn, wheat, sorghum, and medicinal herbs need to be dried as soon as possible after harvesting for transportation or storage; otherwise, prolonged storage will lead to sprouting, mold, and rot. Existing agricultural product granule dryers typically use hot air ducts to continuously supply hot air into the drying chamber during the drying process. However, the agricultural product granules cannot circulate within the drying chamber, resulting in uneven drying.

[0003] With technological advancements, a type of agricultural product pellet dryer has gradually emerged that can dry agricultural products moving within the drying chamber. This dryer has multiple layers of inclined material plates inside the drying chamber, arranged from top to bottom as the first, second, and third material plates. Agricultural product pellets can roll from the first material plate to the second material plate, then from the second material plate to the third material plate, and so on, until they reach the bottom of the drying chamber. Simultaneously, hot air is continuously supplied into the drying chamber through hot air pipes, allowing the agricultural product pellets to dry as they gradually fall. However, this agricultural product pellet dryer also has the following technical problems: (1) Since multiple inclined material plates need to be set inside the drying chamber, the agricultural product pellets need to be dried when they roll to the bottom layer. Therefore, the number of material plates in the drying chamber will be relatively large (usually more than 12 layers), and the overall height of the drying chamber will be very high, forming a high tower drying chamber, which leads to a high installation cost of the drying chamber; (2) Since the time for agricultural product pellets to roll from the first material plate above to the bottom of the drying chamber is roughly the same, and the moisture content of different agricultural product pellets is different, the drying time and the moisture content after drying are different. Therefore, the existing agricultural product pellet dryer cannot adjust the drying time for different agricultural product pellets, and cannot dry various agricultural product pellets. It can only dry specific agricultural product pellets; (3) Some agricultural product pellets, especially peanuts and medicinal materials, are difficult to roll down on the inclined material plates, and it is difficult to use this agricultural product pellet dryer for drying. Summary of the Invention

[0004] The technical problem this invention aims to solve is to address the shortcomings of the prior art by providing a cyclic material conveying agricultural product pellet dryer. This dryer circulates agricultural product pellets through a discharge device and a lifting device, ensuring uniform drying and continuous movement of the pellets within the drying chamber. Furthermore, the drying chamber does not require multiple layers of material trays, allowing for a lower overall height and reduced installation costs. The dryer can adjust the drying time according to the moisture content and size of different agricultural product pellets, enabling the drying of various types of agricultural product pellets. Simultaneously, this invention also provides a drying method for this agricultural product pellet dryer.

[0005] To solve the above-mentioned technical problems, the first technical solution of the present invention is: an agricultural product pellet dryer for circulating material conveying, comprising a frame, a drying chamber, a hopper, a discharge device, a lifting device, a high-pressure blower, and a heating device; the drying chamber is installed on the frame and can accommodate agricultural product pellets; multiple drying air ducts are installed inside the drying chamber at intervals, and multiple micro air outlets are arranged on the drying air ducts; each drying air duct has 2 to 6 heating tubes on its outer side, the 2 to 6 heating tubes are distributed circumferentially along the drying air duct, and there are gaps between adjacent heating tubes; the hopper is installed at the lower end of the drying chamber, one end of the discharge device is installed at the lower end of the hopper, and the lower end of the lifting device is connected to the other end of the discharge device. The upper end of the lifting device extends to the upper end of the drying chamber. The agricultural product particles inside the drying chamber can fall through the hopper to the discharge device under the action of gravity. The discharge device conveys the agricultural product particles to the lifting device, and the lifting device then conveys the agricultural product particles into the drying chamber. The heating device is connected to the two ends of the heating tube by an insulated pipe. The heating device can output the heat medium to the heating tube through the insulated pipe, and then return it from the heating tube to the heating device. The high-pressure blower is connected to one end of the drying air duct by an air supply pipe. The high-pressure blower can output compressed air to the drying air duct through the air supply pipe, and then blow it out from the micro air outlet of the drying air duct. The air blown out from the micro air outlet can be heated by the heating tube and then blown into the drying chamber.

[0006] The technical advantages of the first technical solution of the present invention are: (1) Since the lower end of the drying chamber is equipped with a hopper, one end of the discharge device is installed at the lower end of the hopper, the lower end of the lifting device is connected to the other end of the discharge device, and the upper end of the lifting device extends to the upper end of the drying chamber, the agricultural product particles in the drying chamber can fall through the hopper to the discharge device under the action of gravity. The discharge device conveys the agricultural product particles to the lifting device, and the lifting device then conveys the agricultural product particles into the drying chamber. Therefore, the present invention can circulate and transport agricultural product particles through the discharge device and the lifting device, so that the agricultural product particles circulate and move in the drying chamber and dry evenly. Moreover, there is no need to set up multiple layers of material plates in the drying chamber, the overall height of the drying chamber can be controlled to be low, and the installation cost is low; (2) The present invention uses the discharge device and the lifting device to circulate and transport agricultural product particles, so that the agricultural product particles move in the drying chamber. The working time of the discharge device and the lifting device can be adjusted according to the moisture content and particle size of different agricultural product particles, thereby adjusting the drying time of different agricultural product particles; (3) The present invention uses the discharge device and the lifting device to circulate and transport agricultural product particles, so that the agricultural product particles move in the drying chamber. The working time of the discharge device and the lifting device can be adjusted according to the moisture content and particle size of different agricultural product particles, thereby adjusting the drying time of different agricultural product particles; During the process, the agricultural product particles in the drying chamber move naturally downward by gravity. Therefore, this invention can be applied to drying various agricultural product particles, including peanuts and medicinal materials. (4) In this invention, multiple drying air pipes are installed in the drying chamber at intervals. Multiple micro air outlets are arranged on the drying air pipes. Each drying air pipe has 2 to 6 heating tubes on its outer side. The 2 to 6 heating tubes are distributed around the circumference of the drying air pipes. There are gaps between adjacent heating tubes. The heating device is connected to the two ends of the heating tubes by heat-insulating pipes. The heating device can output the heat medium to the heating tube through the heat insulation pipe, and then return it to the heating device from the heating tube. An air supply pipe is connected between the high-pressure blower and one end of the drying air duct. The high-pressure blower can output compressed air to the drying air duct through the air supply pipe, and then blow it out from the micro air outlet of the drying air duct. The air blown out from the micro air outlet can be heated by the heating tube and then blown into the drying chamber. Therefore, the present invention can efficiently dry the agricultural product particles in the drying chamber under the combined action of the high-pressure blower, the heating device, the drying air duct and the heating tube.

[0007] In the above technical solution, heat dissipation fins are provided on the outer side of the heating tube, and 3 to 4 heating tubes are provided on the outer side of each drying air duct. The air discharged from the micro air outlet of the drying air duct can pass through the heat dissipation fins and then be blown into the drying chamber; the heat medium is hot water, steam, or hot air. This invention significantly improves the heat dissipation efficiency of the heating tube by providing heat dissipation fins on the outer side of the heating tube, thereby greatly improving the drying efficiency.

[0008] In the above technical solution, the heating device includes a boiler and a water pump. The boiler's outlet is connected to one end of each heating element via an insulated pipe, and the boiler's inlet is connected to the other end of each heating element via an insulated pipe. The water pump is installed on the insulated pipe. Multiple high-pressure blowers are provided, each connected to 3-5 drying air ducts via an air supply duct. This method of using a boiler to heat water combined with a water pump to circulate and deliver hot water is particularly suitable for rural areas and has good application results.

[0009] In the above technical solution, the discharge device is a spiral tube conveyor, which includes a first conveying pipe, a conveying shaft, spiral blades, and a first motor. The first conveying pipe is horizontally arranged, and both the conveying shaft and the spiral blades are installed inside the first conveying pipe, with the spiral blades mounted on the conveying shaft. The power output end of the first motor is connected to the conveying shaft. The first conveying pipe has a first conveying pipe inlet and a first conveying pipe outlet. The first conveying pipe inlet is connected to the lower end of the hopper, and the first conveying pipe outlet is connected to the lower end of the lifting device. Using a spiral tube conveyor facilitates the horizontal conveying of agricultural product particles.

[0010] In the above technical solution, the lifting device is a bucket elevator, which includes a second conveying pipe, a conveying chain, conveying buckets, a second motor, and a discharge pipe. The second conveying pipe is vertically arranged, and the conveying chain and conveying buckets are both installed inside the second conveying pipe. Multiple conveying buckets are arranged at intervals on the conveying chain. The power output end of the second motor is connected to the conveying chain. The lower end of the second conveying pipe has a second conveying pipe inlet, which communicates with the first conveying pipe outlet. The upper end of the second conveying pipe has a second conveying pipe outlet, which is obliquely arranged. The upper end of the outlet pipe communicates with the second conveying pipe outlet, and the lower end of the outlet pipe extends into the drying chamber. Two spiral tube conveyors are arranged side-by-side. The first conveying pipe inlets of both spiral tube conveyors are simultaneously connected to the lower ends of the buckets, and the first conveying pipe outlets of both spiral tube conveyors are simultaneously connected to the lower end of the lifting device. This invention uses a bucket elevator, which facilitates the vertical conveying of agricultural product particles. This invention employs two spiral tube conveyors, which facilitates control of the conveying speed. When conveying agricultural product granules at low speed, only one spiral tube conveyor can be started, while when conveying agricultural product granules at high speed, both spiral tube conveyors can be started.

[0011] The drying method of the agricultural product pellet dryer with circulating material conveying in the first technical solution of the present invention includes the following steps: S1. Load the agricultural product granules to be dried into the drying chamber; S2. Start the high-pressure blower and heating device. The heating device outputs the heat medium through the heat-insulating pipe to the heating tube, and then outputs it back to the heating device from the heating tube. The high-pressure blower outputs compressed air through the air supply pipe to the drying air duct, and then blows it out from the micro air outlet of the drying air duct. The air blown out from the micro air outlet is heated by the heating tube and then blown into the drying chamber. The agricultural product particles in the drying chamber are gradually dried under the action of hot air. S3. Start the discharge device and the lifting device. Under the action of gravity, the agricultural product particles in the drying chamber gradually fall through the hopper to the discharge device. The discharge device conveys the agricultural product particles to the lifting device, and the lifting device then conveys the agricultural product particles back into the drying chamber. This process of conveying agricultural product particles in a cycle allows them to be heated and dried evenly in the drying chamber. S4. After the agricultural product granules are dried, the high-pressure blower and heating device stop operating, while the discharge device and lifting device continue to operate, extending the discharge pipe at the top of the lifting device out of the drying chamber to output the agricultural product granules.

[0012] To solve the above-mentioned technical problems, the second technical solution of the present invention is: an agricultural product pellet dryer for circulating material conveying, comprising a frame, a drying chamber, a hopper, a discharge device, a lifting device, a boiler, a water pump, a heat exchanger, and a high-pressure blower; the drying chamber is installed on the frame and can accommodate agricultural product pellets; multiple drying air ducts are installed inside the drying chamber at intervals, and multiple micro air outlets are arranged on the drying air ducts; the hopper is installed at the lower end of the drying chamber, one end of the discharge device is installed at the lower end of the hopper, the lower end of the lifting device is connected to the other end of the discharge device, and the upper end of the lifting device extends towards the upper end of the drying chamber; the agricultural product pellets inside the drying chamber can pass through the hopper under the action of gravity. The particles fall to the discharge device, which then conveys them to the lifting device, which in turn conveys them to the drying chamber. A circulating water pipe is installed between the boiler's outlet, the water pump, the heat exchanger, and the boiler's inlet. The boiler is used to heat water, and the hot water in the boiler can pass through the heat exchanger and then flow back to the boiler under the action of the water pump. An air supply pipe is connected between the heat exchanger and the drying air duct. A high-pressure blower is installed at one end of the heat exchanger and can blow compressed air into the heat exchanger. The compressed air exchanges heat with the hot water in the circulating water pipe inside the heat exchanger to form hot air. This hot air is then output to the drying air duct through the air supply pipe and then blown out of the miniature air outlet of the drying air duct into the drying chamber.

[0013] The technical advantages of the second technical solution of the present invention are: (1) Since the lower end of the drying chamber is equipped with a hopper, one end of the discharge device is installed at the lower end of the hopper, the lower end of the lifting device is connected to the other end of the discharge device, and the upper end of the lifting device extends to the upper end of the drying chamber, the agricultural product particles in the drying chamber can fall to the discharge device through the hopper under the action of gravity. The discharge device conveys the agricultural product particles to the lifting device, and the lifting device then conveys the agricultural product particles into the drying chamber. Therefore, the present invention can circulate and transport agricultural product particles through the discharge device and the lifting device, so that the agricultural product particles circulate and move in the drying chamber and dry evenly. Moreover, there is no need to set up multiple layers of material plates in the drying chamber, the overall height of the drying chamber can be controlled to be low, and the installation cost is low; (2) The present invention uses the discharge device and the lifting device to circulate and transport agricultural product particles, so that the agricultural product particles move in the drying chamber. The working time of the discharge device and the lifting device can be adjusted according to the moisture content and particle size of different agricultural product particles, thereby adjusting the drying time of different agricultural product particles; (3) The present invention During use, the agricultural product particles in the drying chamber are naturally lowered by gravity. Therefore, this invention is applicable to drying various agricultural product particles, including peanuts and medicinal herbs. (4) This invention has multiple spaced drying air pipes installed in the drying chamber, with multiple micro air outlets arranged on the drying air pipes. A circulating water pipe is provided between the boiler's outlet, water pump, heat exchanger, and boiler's inlet. The boiler is used to heat water. Under the action of the water pump, the hot water in the boiler can pass through the heat exchanger and then... The air is returned to the boiler. An air supply pipe connects the heat exchanger and the drying air duct. A high-pressure blower is installed at one end of the heat exchanger. The high-pressure blower can blow compressed air into the heat exchanger. The compressed air exchanges heat with the hot water in the circulating water pipe inside the heat exchanger to form hot air. This hot air is then output to the drying air duct through the air supply pipe, and then blown out from the micro air outlet of the drying air duct into the drying chamber. Therefore, the present invention can efficiently dry the agricultural product particles in the drying chamber under the combined action of the boiler, water pump, heat exchanger and drying air duct.

[0014] In the above technical solution, the discharge device is a spiral tube conveyor, which includes a first conveying pipe, a conveying shaft, spiral blades, and a first motor. The first conveying pipe is horizontally arranged, and both the conveying shaft and the spiral blades are installed inside the first conveying pipe, with the spiral blades mounted on the conveying shaft. The power output end of the first motor is connected to the conveying shaft. The first conveying pipe has a first conveying pipe inlet and a first conveying pipe outlet. The first conveying pipe inlet is connected to the lower end of the hopper, and the first conveying pipe outlet is connected to the lower end of the lifting device. Using a spiral tube conveyor facilitates the horizontal conveying of agricultural product particles.

[0015] In the above technical solution, the lifting device is a bucket elevator, which includes a second conveying pipe, a conveying chain, conveying buckets, a second motor, and a discharge pipe. The second conveying pipe is vertically arranged, and the conveying chain and conveying buckets are both installed inside the second conveying pipe. Multiple conveying buckets are arranged at intervals on the conveying chain. The power output end of the second motor is connected to the conveying chain. The lower end of the second conveying pipe has a second conveying pipe inlet, which communicates with the first conveying pipe outlet. The upper end of the second conveying pipe has a second conveying pipe outlet, which is obliquely arranged. The upper end of the outlet pipe communicates with the second conveying pipe outlet, and the lower end of the outlet pipe extends into the drying chamber. Two spiral tube conveyors are arranged side-by-side. The first conveying pipe inlets of both spiral tube conveyors are simultaneously connected to the lower ends of the buckets, and the first conveying pipe outlets of both spiral tube conveyors are simultaneously connected to the lower end of the lifting device. This invention uses a bucket elevator, which facilitates the vertical conveying of agricultural product particles. This invention employs two spiral tube conveyors, which facilitates control of the conveying speed. When conveying agricultural product granules at low speed, only one spiral tube conveyor can be started, while when conveying agricultural product granules at high speed, both spiral tube conveyors can be started.

[0016] The drying method of the agricultural product pellet dryer with circulating material conveying in the second technical solution of the present invention includes the following steps: S1. Load the agricultural product granules to be dried into the drying chamber; S2. Start the boiler, water pump and high-pressure blower. Under the action of the water pump, the hot water in the boiler flows back to the boiler after passing through the heat exchanger. The high-pressure blower blows compressed air into the heat exchanger. The compressed air exchanges heat with the hot water in the circulating water pipe in the heat exchanger to form hot air. The hot air is output to the drying air duct after passing through the air supply duct, and then blown out into the drying chamber from the micro air outlet of the drying air duct. The agricultural product particles in the drying chamber are gradually dried under the action of the hot air. S3. Start the discharge device and the lifting device. Under the action of gravity, the agricultural product particles in the drying chamber gradually fall through the hopper to the discharge device. The discharge device conveys the agricultural product particles to the lifting device, and the lifting device then conveys the agricultural product particles back into the drying chamber. This process of conveying agricultural product particles in a cycle allows them to be heated and dried evenly in the drying chamber. S4. After the agricultural product granules are dried, the high-pressure blower and heating device stop operating, while the discharge device and lifting device continue to operate, extending the discharge pipe at the top of the lifting device out of the drying chamber to output the agricultural product granules. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the frame, drying chamber, hopper, discharge device, and lifting device of Embodiment 1.

[0018] Figure 2 This is a schematic diagram of the drying chamber structure in Example 1.

[0019] Figure 3 This is a schematic diagram of the drying air duct and heating element in Example 1.

[0020] Figure 4 The diagram shows the structure of the discharge device and the lifting device in Embodiment 1 and Embodiment 2.

[0021] Figure 5 This is a top view schematic diagram of the hopper structure in Embodiment 1 and Embodiment 2.

[0022] Figure 6 This is a schematic diagram of the working status of the boiler, water pump, high-pressure blower and drying chamber in Example 1.

[0023] Figure 7 This is a schematic diagram of the frame, drying chamber, hopper, discharge device, and lifting device of Embodiment 2.

[0024] Figure 8 This is a schematic diagram of the drying chamber structure in Example 2.

[0025] Figure 9 This is a schematic diagram of the working state of the boiler, water pump, high-pressure blower and heat exchanger in Example 2. Detailed Implementation

[0026] The structural and working principles of the present invention will be further described in detail below with reference to the accompanying drawings. Example 1

[0027] like Figures 1-6As shown in Embodiment 1, an agricultural product pellet dryer with circulating material conveying is provided, including a frame 1, a drying chamber 2, a hopper 3, a discharge device 4, a lifting device 5, a high-pressure blower 6, and a heating device. The drying chamber 2 is installed on the frame 1 and can hold agricultural product pellets. Multiple spaced drying air ducts 21 are installed inside the drying chamber 2. Multiple micro air outlets 211 are arranged on the drying air ducts 21. Each drying air duct 21 has 2-6 heating tubes 22 on its outer side, distributed circumferentially along the drying air duct 21, with gaps between adjacent heating tubes 22. The hopper 3 is installed at the lower end of the drying chamber 2. One end of the discharge device 4 is installed at the lower end of the hopper 3. The lower end of the lifting device 5 is connected to the other end of the discharge device 4. The upper end of the lifting device 5 extends towards the upper end of the drying chamber 2. The agricultural product particles inside the drying chamber 2 can fall through the hopper 3 to the discharge device 4 under the action of gravity. The discharge device 4 conveys the agricultural product particles to the lifting device 5, and the lifting device 5 then conveys the agricultural product particles into the drying chamber 2. The heating device is connected to the two ends of the heating tube 22 by an insulated pipe. The heating device can output the heat medium to the heating tube 22 through the insulated pipe, and then output it back to the heating device from the heating tube 22. The high-pressure blower 6 is connected to one end of the drying air duct 21 by an air supply pipe. The high-pressure blower 6 can output compressed air to the drying air duct 21 through the air supply pipe, and then blow it out from the micro air outlet 211 of the drying air duct 21. The air blown out from the micro air outlet 211 can be heated by the heating tube 22 and then blown into the drying chamber 2.

[0028] This invention features a hopper 3 installed at the lower end of the drying chamber 2, with one end of a discharge device 4 attached to the lower end of the hopper 3. The lower end of a lifting device 5 is connected to the other end of the discharge device 4, and the upper end of the lifting device 5 extends towards the upper end of the drying chamber 2. Agricultural product particles within the drying chamber 2 can fall from the hopper 3 to the discharge device 4 under gravity. The discharge device 4 then conveys the agricultural product particles to the lifting device 5, which in turn conveys them back into the drying chamber 2. Therefore, this invention enables the cyclical transport of agricultural product particles through the discharge device 4 and the lifting device 5, allowing the particles to circulate and dry evenly within the drying chamber 2. Furthermore, the drying chamber 2 does not require multiple layers of material trays, allowing for a lower overall height and lower installation costs. This invention utilizes the cyclical transport of agricultural product particles through the discharge device 4 and the lifting device 5 to move the particles within the drying chamber 2. The working time of the discharge device 4 and the lifting device 5 can be adjusted according to the moisture content and particle size of different agricultural product particles, thereby regulating the drying time. In this invention, agricultural product particles naturally descend within the drying chamber 2 due to gravity during operation. Therefore, this invention is applicable to drying various agricultural product particles, including peanuts and medicinal herbs. The invention features multiple spaced-apart drying ducts 21 within the drying chamber 2, each with numerous micro-air outlets 211. Each drying duct 21 has 2-6 heating elements 22 arranged circumferentially along its outer side, with gaps between adjacent elements. An insulated pipe connects the heating device to both ends of the heating elements 22, allowing the heating device to output heat medium through the insulated pipe to the heating elements 22 and then return it from the heating elements 22 to the heating chamber. The device has an air supply pipe connected between the high-pressure blower 6 and one end of the drying air duct 21. The high-pressure blower 6 can output compressed air to the drying air duct 21 through the air supply pipe, and then blow it out from the micro air outlet 211 of the drying air duct 21. The air blown out from the micro air outlet 211 can be heated by the heating tube 22 and then blown into the drying chamber 2. Therefore, the present invention can efficiently dry the agricultural product particles in the drying chamber 2 under the combined action of the high-pressure blower 6, the heating device, the drying air duct 21 and the heating tube 22.

[0029] like Figure 3 As shown, the heating element 22 is provided with heat dissipation fins on its outer side, and each drying air duct 21 has 3 to 4 heating elements 22 on its outer side. The air discharged from the miniature air outlet 211 of the drying air duct 21 can pass through the heat dissipation fins 221 and then be blown into the drying chamber 2. The heat medium is hot water, steam, or hot air. By providing heat dissipation fins 221 on the outer side of the heating element 22, the present invention significantly improves the heat dissipation efficiency of the heating element 22, thereby greatly improving the drying efficiency.

[0030] like Figure 6As shown, the heating device includes a boiler 7 and a water pump 8. The outlet of the boiler 7 is connected to one end of each heating element 22 via an insulated pipe, and the inlet of the boiler 7 is connected to the other end of each heating element 22 via an insulated pipe. The water pump 8 is installed on the insulated pipe. Multiple high-pressure blowers 6 are provided, and each high-pressure blower 6 is connected to 3-5 drying air ducts 21 via an air supply duct. This method of using the boiler 7 to heat water and combining it with the water pump 8 to circulate and deliver hot water is particularly suitable for rural areas and has good application results.

[0031] like Figure 4 As shown, the discharge device 4 is a spiral conveyor, which includes a first conveying pipe 41, a conveying shaft 42, spiral blades 43, and a first motor 44. The first conveying pipe 41 is horizontally arranged. The conveying shaft 42 and spiral blades 43 are both installed inside the first conveying pipe 41, and the spiral blades 43 are mounted on the conveying shaft 42. The power output end of the first motor 44 is connected to the conveying shaft 42. The first conveying pipe 41 has a first conveying pipe inlet 411 and a first conveying pipe outlet 412. The first conveying pipe inlet 411 is connected to the lower end of the hopper 3, and the first conveying pipe outlet 412 is connected to the lower end of the lifting device 5. Using a spiral conveyor facilitates the horizontal conveying of agricultural product particles.

[0032] like Figure 4 As shown, the lifting device 5 is a bucket elevator, which includes a second conveying pipe 51, a conveying chain 52, conveying buckets 53, a second motor 54, and a discharge pipe 55. The second conveying pipe 51 is vertically arranged. The conveying chain 52 and the conveying buckets 53 are both installed inside the second conveying pipe 51. Multiple conveying buckets 53 are provided and spaced apart on the conveying chain 52. The power output end of the second motor 54 is connected to the conveying chain 52. The lower end of the second conveying pipe 51 is provided with a second conveying pipe inlet 511, which is connected to the first conveying pipe outlet 412. The upper end of the second conveying pipe 51 is provided with a second conveying pipe outlet 512. The discharge pipe 55 is obliquely arranged, with its upper end connected to the second conveying pipe outlet 512, and its lower end extending into the drying chamber 2. Figure 1 As shown, two spiral conveyors are arranged side by side. The inlet 411 of the first conveying pipe of both spiral conveyors is simultaneously connected to the lower end of the hopper 3, and the outlet 412 of the first conveying pipe of both spiral conveyors is simultaneously connected to the lower end of the lifting device 5. This invention uses a bucket elevator, which facilitates the vertical conveying of agricultural product particles. The use of two spiral conveyors in this invention facilitates the control of the conveying speed. When conveying agricultural product particles at low speed, only one spiral conveyor can be started, while when conveying agricultural product particles at high speed, both spiral conveyors can be started.

[0033] The drying method of the agricultural product pellet dryer with circulating material conveying according to Embodiment 1 of the present invention includes the following method steps: S1. Load the agricultural product granules to be dried into the drying chamber 2; S2. Start the high-pressure blower 6 and the heating device. The heating device outputs the heat medium through the heat-insulating pipe to the heating tube 22, and then outputs it back to the heating device from the heating tube 22. The high-pressure blower 6 outputs compressed air through the air supply pipe to the drying air duct 21, and then blows it out from the micro air outlet 211 of the drying air duct 21. The air blown out from the micro air outlet 211 is heated by the heating tube 22 and then blown into the drying chamber 2. The agricultural product particles in the drying chamber 2 are gradually dried under the action of hot air. S3. Start the discharge device 4 and the lifting device 5. Under the action of gravity, the agricultural product particles in the drying chamber 2 gradually fall through the hopper 3 to the discharge device 4. The discharge device 4 conveys the agricultural product particles to the lifting device 5. The lifting device 5 then conveys the agricultural product particles into the drying chamber 2. The agricultural product particles are conveyed in this way, so that the agricultural product particles are heated and dried evenly in the drying chamber 2. S4. After the agricultural product granules are dried, the high-pressure blower and heating device stop operating, while the discharge device 4 and lifting device 5 continue to operate, extending the discharge pipe 55 at the top of the lifting device 5 out of the drying chamber 2 to output the agricultural product granules. Example 2

[0034] like Figures 7-9 , Figure 4 and Figure 5As shown, Embodiment 2 provides an agricultural product pellet dryer with circulating material conveying, including a frame 1, a drying chamber 2, a hopper 3, a discharge device 4, a lifting device 5, a boiler 10, a water pump 11, a heat exchanger 12, and a high-pressure blower 13. The drying chamber 2 is installed on the frame 1 and can hold agricultural product pellets. Multiple spaced drying air ducts 21 are installed inside the drying chamber 2, and multiple micro air outlets 211 are arranged on the drying air ducts 21. It should be noted that the structure of the drying air ducts 21 in Embodiment 2 is the same as that in Embodiment 1. The hopper 3 is installed at the lower end of the drying chamber 2, one end of the discharge device 4 is installed at the lower end of the hopper 3, and the lower end of the lifting device 5 is connected to the other end of the discharge device 4. The upper end of the lifting device 5 extends towards the upper end of the drying chamber 2. The agricultural product pellets inside the drying chamber 2 can be conveyed by gravity through... The hopper 3 falls to the discharge device 4, which conveys the agricultural product particles to the lifting device 5, which then conveys them to the drying chamber 2. A circulating water pipe is provided between the water outlet of the boiler 10, the water pump 11, the heat exchanger 12, and the water inlet of the boiler 10. The boiler 10 is used to heat water. Under the action of the water pump 11, the hot water in the boiler 10 can pass through the heat exchanger 12 and then flow back to the boiler 10. An air supply pipe is connected between the heat exchanger 12 and the drying air pipe 21. The high-pressure blower 13 is installed at one end of the heat exchanger 12. The high-pressure blower 13 can blow compressed air into the heat exchanger 12. The compressed air exchanges heat with the hot water in the circulating water pipe inside the heat exchanger 12 to form hot air. The hot air is then output to the drying air pipe 21 through the air supply pipe and then blown out from the miniature air outlet 211 of the drying air pipe 21 into the drying chamber 2.

[0035] This invention features a hopper 3 installed at the lower end of the drying chamber 2, with one end of a discharge device 4 attached to the lower end of the hopper 3. The lower end of a lifting device 5 is connected to the other end of the discharge device 4, and the upper end of the lifting device 5 extends towards the upper end of the drying chamber 2. Agricultural product particles within the drying chamber 2 can fall from the hopper 3 to the discharge device 4 under gravity. The discharge device 4 then conveys the agricultural product particles to the lifting device 5, which in turn conveys them back into the drying chamber 2. Therefore, this invention enables the cyclical transport of agricultural product particles through the discharge device 4 and the lifting device 5, allowing the particles to circulate and dry evenly within the drying chamber 2. Furthermore, the drying chamber 2 does not require multiple layers of material trays, allowing for a lower overall height and lower installation costs. This invention utilizes the cyclical transport of agricultural product particles through the discharge device 4 and the lifting device 5 to move the particles within the drying chamber 2. The working time of the discharge device 4 and the lifting device 5 can be adjusted according to the moisture content and particle size of different agricultural product particles, thereby regulating the drying time. In this invention, agricultural product particles move naturally downwards within the drying chamber 2 by gravity during use. Therefore, this invention is applicable to drying various agricultural product particles, including peanuts and medicinal herbs. The invention features multiple spaced-apart drying air ducts 21 within the drying chamber 2, each with numerous micro-air outlets 211. A circulating water pipe connects the water outlet of the boiler 10, the water pump 11, the heat exchanger 12, and the water inlet of the boiler 10. The boiler 10 heats water; under the action of the water pump 11, the hot water in the boiler 10 passes through the heat exchanger 12 and then returns to the boiler 10. An air supply pipe connects the heat exchanger 12 and the drying air ducts 21. A high-pressure blower 13 is installed within the drying chamber. At one end of the heat exchanger 12, the high-pressure blower 13 can blow compressed air into the heat exchanger 12. The compressed air exchanges heat with the hot water in the circulating water pipe inside the heat exchanger 12 to form hot air. The hot air is then output to the drying air duct 21 after passing through the air supply pipe, and then blown out into the drying chamber 2 from the miniature air outlet 211 of the drying air duct 21. Therefore, the present invention can efficiently dry the agricultural product particles in the drying chamber 2 under the combined action of the boiler 10, water pump 11, heat exchanger 12 and drying air duct 21.

[0036] like Figure 4As shown, the discharge device 4 is a spiral conveyor, which includes a first conveying pipe 41, a conveying shaft 42, spiral blades 43, and a first motor 44. The first conveying pipe 41 is horizontally arranged. The conveying shaft 42 and spiral blades 43 are both installed inside the first conveying pipe 41, and the spiral blades 43 are mounted on the conveying shaft 42. The power output end of the first motor 44 is connected to the conveying shaft 42. The first conveying pipe 41 has a first conveying pipe inlet 411 and a first conveying pipe outlet 412. The first conveying pipe inlet 411 is connected to the lower end of the hopper 3, and the first conveying pipe outlet 412 is connected to the lower end of the lifting device 5. Using a spiral conveyor facilitates the horizontal conveying of agricultural product particles.

[0037] like Figure 4 As shown, the lifting device 5 is a bucket elevator, which includes a second conveying pipe 51, a conveying chain 52, conveying buckets 53, a second motor 54, and a discharge pipe 55. The second conveying pipe 51 is vertically arranged. The conveying chain 52 and the conveying buckets 53 are both installed inside the second conveying pipe 51. Multiple conveying buckets 53 are provided and installed at intervals on the conveying chain 52. The power output end of the second motor 54 is connected to the conveying chain 52. The lower end of the second conveying pipe 51 is provided with a second conveying pipe inlet 511. The feed inlet 511 of the second conveying pipe is connected to the discharge outlet 412 of the first conveying pipe. The upper end of the second conveying pipe 51 has a second discharge outlet 512. The discharge pipe 55 is obliquely arranged, with its upper end connected to the discharge outlet 512 of the second conveying pipe, and its lower end extending into the drying chamber 2. Two spiral conveyors are arranged side-by-side. The feed inlets 411 of the first conveying pipes of both spiral conveyors are simultaneously connected to the lower end of the hopper 3, and the discharge outlets 412 of the first conveying pipes of both spiral conveyors are simultaneously connected to the lower end of the lifting device 5. This invention uses a bucket elevator, which facilitates the vertical conveying of agricultural product particles. Figure 4 and Figure 7 As shown, the present invention uses two spiral tube conveyors, which facilitates the control of the conveying speed. When conveying agricultural product particles at low speed, only one spiral tube conveyor can be started, while when conveying agricultural product particles at high speed, both spiral tube conveyors can be started.

[0038] The drying method of the agricultural product pellet dryer with ring conveyor material according to Embodiment 2 of the present invention includes the following steps: S1. Load the agricultural product granules to be dried into the drying chamber 2; S2. Start the boiler 10, water pump 11 and high-pressure blower 13. Under the action of water pump 11, the hot water in boiler 10 flows back to boiler 10 after passing through heat exchanger 12. High-pressure blower 13 blows compressed air into heat exchanger 12. The compressed air exchanges heat with the hot water in the circulating water pipe in heat exchanger 12 to form hot air. The hot air is output to drying air duct 21 after passing through air supply pipe, and then blown out from the micro air outlet 211 of drying air duct 21 into drying chamber 2. The agricultural product particles in drying chamber 2 are gradually dried under the action of hot air. S3. Start the discharge device 4 and the lifting device 5. Under the action of gravity, the agricultural product particles in the drying chamber 2 gradually fall through the hopper 3 to the discharge device 4. The discharge device 4 conveys the agricultural product particles to the lifting device 5. The lifting device 5 then conveys the agricultural product particles into the drying chamber 2. The agricultural product particles are conveyed in this way, so that the agricultural product particles are heated and dried evenly in the drying chamber 2. S4. After the agricultural product granules are dried, the high-pressure blower 13 and the heating device stop operating, while the discharge device 4 and the lifting device 5 continue to operate, extending the discharge pipe 55 at the top of the lifting device 5 out of the drying chamber 2 to output the agricultural product granules.

[0039] The above description is merely a preferred embodiment of the present invention. Any minor modifications, equivalent changes, and alterations made to the above embodiments based on the technical solution of the present invention shall fall within the scope of the technical solution of the present invention.

Claims

1. An agricultural product pellet dryer with a circulating material conveying system, characterized in that: The system includes a frame, a drying chamber, a hopper, a discharge device, a lifting device, a high-pressure blower, and a heating device. The drying chamber is mounted on the frame and can hold agricultural product particles. Multiple spaced-apart drying ducts are installed inside the drying chamber, each with numerous micro-air outlets. Each drying duct has 2-6 heating elements distributed circumferentially along its outer side, with gaps between adjacent heating elements. The hopper is installed at the lower end of the drying chamber, and one end of the discharge device is installed at the lower end of the hopper. The lower end of the lifting device is connected to the other end of the discharge device, and the upper end of the lifting device extends towards the upper end of the drying chamber. The agricultural product particles inside the drying chamber can fall through the hopper to the discharge device under the action of gravity. The discharge device conveys the agricultural product particles to the lifting device, and the lifting device then conveys the agricultural product particles into the drying chamber. The heating device is connected to the two ends of the heating tube by an insulated pipe. The heating device can output the heat medium to the heating tube through the insulated pipe, and then return it from the heating tube to the heating device. The high-pressure blower is connected to one end of the drying air duct by an air supply pipe. The high-pressure blower can output compressed air to the drying air duct through the air supply pipe, and then blow it out from the micro air outlet of the drying air duct. The air blown out from the micro air outlet can be heated by the heating tube and then blown into the drying chamber.

2. The agricultural product pellet dryer with circulating material conveying according to claim 1, characterized in that: The heating element is provided with heat dissipation fins on the outside, and each drying air duct is provided with 3 to 4 heating elements on the outside. The air discharged from the micro air outlet of the drying air duct can pass through the heat dissipation fins and then be blown into the drying chamber. The heat medium is hot water, steam or hot air.

3. The agricultural product pellet dryer with circulating material conveying according to claim 2, characterized in that: The heating device includes a boiler and a water pump. The water outlet of the boiler is connected to one end of each heating tube via an insulated pipe, and the water inlet of the boiler is connected to the other end of each heating tube via an insulated pipe. The water pump is installed on the insulated pipe. There are multiple high-pressure blowers, and each high-pressure blower is connected to 3 to 5 drying air pipes via an air supply pipe.

4. The agricultural product pellet dryer with circulating material conveying according to claim 1, characterized in that: The discharge device is a spiral tube conveyor, which includes a first conveying pipe, a conveying shaft, spiral blades, and a first motor. The first conveying pipe is horizontally arranged, and the conveying shaft and spiral blades are both installed inside the first conveying pipe, with the spiral blades mounted on the conveying shaft. The power output end of the first motor is connected to the conveying shaft. The first conveying pipe has a first conveying pipe inlet and a first conveying pipe outlet. The first conveying pipe inlet is connected to the lower end of the hopper, and the first conveying pipe outlet is connected to the lower end of the lifting device.

5. The agricultural product pellet dryer with circulating material conveying according to claim 4, characterized in that: The lifting device is a bucket elevator, which includes a second conveying pipe, a conveying chain, conveying buckets, a second motor, and a discharge pipe. The second conveying pipe is vertically arranged, and the conveying chain and conveying buckets are installed inside the second conveying pipe. Multiple conveying buckets are arranged at intervals on the conveying chain. The power output end of the second motor is connected to the conveying chain. The lower end of the second conveying pipe has a second conveying pipe inlet, which is connected to the first conveying pipe outlet. The upper end of the second conveying pipe has a second conveying pipe outlet. The discharge pipe is obliquely arranged, and its upper end is connected to the second conveying pipe outlet. The lower end of the discharge pipe extends into the drying chamber. Two spiral tube conveyors are arranged side by side. The first conveying pipe inlets of the two spiral tube conveyors are simultaneously connected to the lower end of the buckets, and the first conveying pipe outlets of the two spiral tube conveyors are simultaneously connected to the lower end of the lifting device.

6. The drying method of the agricultural product pellet dryer with circulating material conveying as described in any one of claims 1-5, characterized in that, The methods and steps include the following: S1. Load the agricultural product granules to be dried into the drying chamber; S2. Start the high-pressure blower and heating device. The heating device outputs the heat medium through the heat-insulating pipe to the heating tube, and then outputs it back to the heating device from the heating tube. The high-pressure blower outputs compressed air through the air supply pipe to the drying air duct, and then blows it out from the micro air outlet of the drying air duct. The air blown out from the micro air outlet is heated by the heating tube and then blown into the drying chamber. The agricultural product particles in the drying chamber are gradually dried under the action of hot air. S3. Start the discharge device and the lifting device. Under the action of gravity, the agricultural product particles in the drying chamber gradually fall through the hopper to the discharge device. The discharge device conveys the agricultural product particles to the lifting device, and the lifting device then conveys the agricultural product particles back into the drying chamber. This process of conveying agricultural product particles in a cycle allows them to be heated and dried evenly in the drying chamber. S4. After the agricultural product granules are dried, the high-pressure blower and heating device stop operating, while the discharge device and lifting device continue to operate, extending the discharge pipe at the top of the lifting device out of the drying chamber to output the agricultural product granules.

7. An agricultural product pellet dryer with a circulating material conveying system, characterized in that: The system includes a frame, drying chamber, hopper, discharge device, lifting device, boiler, water pump, heat exchanger, and high-pressure blower. The drying chamber is mounted on the frame and can hold agricultural product particles. Multiple spaced-apart drying ducts are installed inside the drying chamber, each with numerous micro-air outlets. The hopper is located at the lower end of the drying chamber, and one end of the discharge device is attached to the lower end of the hopper. The lower end of the lifting device is connected to the other end of the discharge device, and the upper end of the lifting device extends towards the upper end of the drying chamber. Agricultural product particles inside the drying chamber fall through the hopper to the discharge device under gravity, and the discharge device then conveys the particles. The product particles are then conveyed to the lifting device and transferred to the drying chamber. A circulating water pipe is provided between the boiler's outlet, water pump, heat exchanger, and boiler's inlet. The boiler is used to heat water. Under the action of the water pump, the hot water in the boiler can pass through the heat exchanger and then flow back to the boiler. An air supply pipe is connected between the heat exchanger and the drying air duct. A high-pressure blower is installed at one end of the heat exchanger. The high-pressure blower can blow compressed air into the heat exchanger. The compressed air exchanges heat with the hot water in the circulating water pipe inside the heat exchanger to form hot air. This hot air is then output to the drying air duct through the air supply pipe and then blown out of the miniature air outlet of the drying air duct into the drying chamber.

8. The agricultural product pellet dryer with circulating material conveying according to claim 7, characterized in that: The discharge device is a spiral tube conveyor, which includes a first conveying pipe, a conveying shaft, spiral blades, and a first motor. The first conveying pipe is horizontally arranged, and the conveying shaft and spiral blades are both installed inside the first conveying pipe, with the spiral blades mounted on the conveying shaft. The power output end of the first motor is connected to the conveying shaft. The first conveying pipe has a first conveying pipe inlet and a first conveying pipe outlet. The first conveying pipe inlet is connected to the lower end of the hopper, and the first conveying pipe outlet is connected to the lower end of the lifting device.

9. The agricultural product pellet dryer with circulating material conveying according to claim 8, characterized in that: The lifting device is a bucket elevator, which includes a second conveying pipe, a conveying chain, conveying buckets, a second motor, and a discharge pipe. The second conveying pipe is vertically arranged, and the conveying chain and conveying buckets are installed inside the second conveying pipe. Multiple conveying buckets are arranged at intervals on the conveying chain. The power output end of the second motor is connected to the conveying chain. The lower end of the second conveying pipe has a second conveying pipe inlet, which is connected to the first conveying pipe outlet. The upper end of the second conveying pipe has a second conveying pipe outlet. The discharge pipe is obliquely arranged, and its upper end is connected to the second conveying pipe outlet. The lower end of the discharge pipe extends into the drying chamber. Two spiral tube conveyors are arranged side by side. The first conveying pipe inlets of the two spiral tube conveyors are simultaneously connected to the lower end of the buckets, and the first conveying pipe outlets of the two spiral tube conveyors are simultaneously connected to the lower end of the lifting device.

10. The drying method of the agricultural product pellet dryer with circulating material conveying according to any one of claims 7-9, characterized in that, The methods and steps include the following: S1. Load the agricultural product granules to be dried into the drying chamber; S2. Start the boiler, water pump and high-pressure blower. Under the action of the water pump, the hot water in the boiler flows back to the boiler after passing through the heat exchanger. The high-pressure blower blows compressed air into the heat exchanger. The compressed air exchanges heat with the hot water in the circulating water pipe in the heat exchanger to form hot air. The hot air is output to the drying air duct after passing through the air supply duct, and then blown out from the micro air outlet of the drying air duct into the drying chamber. The agricultural product particles in the drying chamber are gradually dried under the action of the hot air. S3. Start the discharge device and the lifting device. Under the action of gravity, the agricultural product particles in the drying chamber gradually fall through the hopper to the discharge device. The discharge device conveys the agricultural product particles to the lifting device, and the lifting device then conveys the agricultural product particles back into the drying chamber. This process of conveying agricultural product particles in a cycle allows them to be heated and dried evenly in the drying chamber. S4. After the agricultural product granules are dried, the high-pressure blower and heating device stop operating, while the discharge device and lifting device continue to operate, extending the discharge pipe at the top of the lifting device out of the drying chamber to output the agricultural product granules.

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