A seven-layer dryer for food production

Abstract

The application discloses a seven-layer drying machine for food production, which comprises a drying channel, a hot air central unit and a moisture absorber communicated with the drying channel, seven conveying mechanisms fixedly installed at the middle end of the inner cavity of the drying channel and used for conveying food, and air outlet boxes fixedly installed at the left and right sides of the inner cavity of the drying channel and used for drying the food conveyed by the conveying mechanisms. The application solves the technical problem that the existing drying machine for food production is inconvenient for efficient drying of food and difficult to adjust the speed and distribution of air flow according to the type, humidity and drying stage of the food, thereby leading to uneven drying of the food.

Description

Technical Field

[0001] This invention relates to the field of food drying and processing technology, and in particular to a seven-layer dryer for food production. Background Technology

[0002] A seven-layer dryer, used in food production, is a type of high-efficiency drying equipment widely applied in the food industry, especially in processes requiring dehydration of raw materials or finished products. This dryer uses multiple conveyor belts to progressively remove moisture from materials, thereby extending shelf life and improving storage conditions. Seven-layer dryers typically operate continuously. The material to be dried is evenly spread on the top conveyor belt. The seven conveyor belts are positioned differently, allowing food from the first belt to fall onto the second and finally the seventh. As the conveyor belts move slowly, the material falls layer by layer, receiving hot air at each level, gradually reducing its moisture content. By adjusting parameters such as temperature, humidity, and airflow speed at each layer, optimal drying results can be achieved for different materials.

[0003] Existing food production dryers are not convenient for efficient drying of food during use, and it is difficult to adjust the speed and distribution of airflow according to the type of food, humidity, and different stages of drying, resulting in uneven drying of food. Summary of the Invention

[0004] The technical problem to be solved by the present invention is that existing food production dryers are not convenient for efficient drying of food during use, and it is difficult to adjust the speed and distribution of airflow according to the type of food, humidity and different stages of drying, resulting in uneven drying of food.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a seven-layer dryer for food production, comprising,

[0006] A drying duct, wherein a central hot air unit and a dehumidifier are connected to the drying duct;

[0007] The conveying mechanism comprises seven parts, which are fixedly installed in the middle of the inner cavity of the drying channel for conveying food.

[0008] An air outlet box is fixedly installed on the left and right sides of the inner cavity of the drying channel to dry the food conveyed on the conveying mechanism.

[0009] As a preferred embodiment of the seven-layer dryer for food production described in this invention, the air outlet of the central hot air unit is connected to a first hot air pipe and a second hot air pipe respectively. The air outlet of the first hot air pipe extends to the top of the inner cavity of the drying channel and is connected to the air outlet box on the right side. The air outlet of the second hot air pipe extends to the bottom of the inner cavity of the drying channel and is connected to the air outlet box on the left side.

[0010] As a preferred embodiment of the seven-layer dryer for food production described in this invention, the air inlet of the desiccant is connected to a first desiccant pipe and a second desiccant pipe, the air inlet of the first desiccant pipe extends to the bottom of the drying channel cavity, and the air inlet of the second desiccant pipe extends to the top of the drying channel cavity.

[0011] As a preferred embodiment of the seven-layer dryer for food production described in this invention, the conveying mechanism includes a first conveyor frame and a second conveyor frame, and a moisture absorption channel is provided on the opposite side of the first conveyor frame and the second conveyor frame.

[0012] As a preferred embodiment of the seven-layer dryer for food production described in this invention, a plurality of conveying cylinders are rotatably connected to the first conveyor frame and the second conveyor frame, and the surfaces of the conveying cylinders are respectively connected to a first conveyor belt and a second conveyor belt, the first conveyor belt being located inside the first conveyor frame, and the second conveyor belt being located inside the second conveyor frame.

[0013] As a preferred embodiment of the seven-layer dryer for food production described in this invention, a fixed frame is fixedly connected to the bottom of the first conveyor frame and the second conveyor frame, a conveying motor is fixedly installed on one side of the fixed frame, and the output shaft of the conveying motor is fixedly connected to one end of the conveying cylinder.

[0014] As a preferred embodiment of the seven-layer dryer for food production described in this invention, a hot air assembly is fixedly installed in the inner cavity of the air outlet box, and the number of hot air assemblies is several, and they are evenly arranged in the inner cavity of the air outlet box.

[0015] As a preferred embodiment of the seven-layer dryer for food production described in this invention, the hot air assembly includes a pipe body, one end of which is fixedly connected to an elastic air outlet head, and one end of which is fixedly connected to an elastic air outlet mesh. The elastic air outlet head and the elastic air outlet mesh extend to the outside of the air outlet box.

[0016] As a preferred embodiment of the seven-layer dryer for food production described in this invention, the tube body surface is connected to an air inlet pipe, one end of the air inlet pipe is connected to an electric wind speed regulating valve, and the electric wind speed regulating valve is connected to a first hot air pipe and a second hot air pipe through a pipeline system.

[0017] As a preferred embodiment of the seven-layer dryer for food production described in this invention, the elastic air outlet and the elastic air outlet mesh are shaped as one of a circle, a rectangle, and a square.

[0018] The beneficial effects of this invention are:

[0019] 1. This invention dries food by setting up a drying channel. A central hot air unit and a dehumidifier are connected to the drying channel. A blower is connected to the air inlet of the central hot air unit, and a filter is connected to the air inlet of the blower. The filter filters the air, and the blower draws the filtered air into the central hot air unit. Simultaneously, high-temperature steam from outside also enters the central hot air unit. The high-temperature steam and air enter different channels within the central hot air unit. The air absorbs the heat from the steam, converting it into high-temperature air. This high-temperature air enters the first and second hot air ducts, where the blower pressurizes the air. A [device / equipment] is fixedly installed inside the drying channel. A humidity sensor is electrically connected to a controller on the drying channel. The humidity sensor transmits a detection signal to the controller. When the detected humidity is higher than the set humidity, the controller activates the dehumidifier. The dehumidifier extracts moisture from the inner cavity of the drying channel through the first and second dehumidifier tubes, preventing the food in the drying channel from becoming damp and improving drying efficiency. During the extraction of moisture by the first and second dehumidifier tubes, the moisture in the inner cavity of the drying channel is discharged through the top and bottom of the cavity. The moisture can also pass through a seven-layer conveying mechanism. The conveying mechanism is equipped with a dehumidifier channel, allowing the moisture to pass through the middle part of the conveying mechanism, further improving the moisture discharge efficiency.

[0020] 2. The conveying mechanism of the present invention has seven layers, and the seven layers are arranged in different positions and staggered, so that the food in the first layer can fall into the second layer and finally into the seventh layer. As the conveying mechanism moves slowly, the food falls layer by layer. Each layer is treated by hot air, thereby gradually reducing its moisture content. During the operation of the conveying mechanism, the output shaft of the conveying motor drives several conveying cylinders to work synchronously. The conveying cylinders drive the first conveyor belt and the second conveyor belt to rotate. The first conveyor belt and the second conveyor belt rotate in the inner cavity of the first conveyor frame and the second conveyor frame, and slowly convey the food. During the conveying process, the hot air assembly dries the food with hot air. The fixing frame supports and fixes the bottom of the first conveyor frame and the second conveyor frame. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the present invention;

[0022] Figure 2 The conveying mechanism of the present invention exploded Figure 1 ;

[0023] Figure 3 The conveying mechanism of the present invention exploded Figure 2 ;

[0024] Figure 4 This is a partial cross-sectional view of the air outlet box of the present invention;

[0025] Figure 5 This is a schematic diagram showing the working states of multiple hot air components of the present invention;

[0026] Figure 6 This is a cross-sectional view of the hot air assembly of the present invention;

[0027] Figure 7 This is a schematic diagram of the structure of the limiting member and the adjusting member of the present invention;

[0028] Figure 8 This is a schematic diagram showing that the flexible air outlet head and flexible air outlet mesh of the present invention are circular;

[0029] Figure 9 This is a schematic diagram showing that the flexible air outlet head and flexible air outlet mesh of the present invention are rectangular in shape;

[0030] Figure 10 This is a schematic diagram showing that the flexible air outlet head and flexible air outlet mesh of the present invention are square.

[0031] In the diagram: 1. Drying channel; 2. Conveying mechanism; 201. First conveyor frame; 202. Conveyor cylinder; 203. Second conveyor frame; 204. Second conveyor belt; 205. First conveyor belt; 206. Conveyor motor; 207. Fixed frame; 208. Moisture absorption channel; 3. Air outlet box; 4. Hot air assembly; 401. Pipe body; 402. Flexible air outlet head; 403. Flexible air outlet mesh; 404. Adjusting component; 405. Elastic 406. Ring; 407. Slide rod; 408. Limiting component; 409. Sliding sleeve; 410. Hydraulic cylinder; 411. Mounting flange; 412. Housing; 413. Electric fan speed regulating valve; 414. Air inlet pipe; 415. Clip; 416. Bend rod; 417. Rotating rod; 418. Rotating component; 5. Central hot air unit; 6. First hot air pipe; 7. Second hot air pipe; 8. Dehumidifier; 9. First dehumidifying pipe; 10. Second dehumidifying pipe. Detailed Implementation

[0032] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0033] like Figures 1-10 As shown, this embodiment provides a seven-layer dryer for food production, including a drying channel 1, on which a hot air central unit 5 and a dehumidifier 8 are connected.

[0034] Furthermore, the air outlet of the hot air central unit 5 is connected to a first hot air pipe 6 and a second hot air pipe 7 respectively. The air outlet of the first hot air pipe 6 extends to the top of the inner cavity of the drying channel 1 and is connected to the air outlet box 3 on the right side. The air outlet of the second hot air pipe 7 extends to the bottom of the inner cavity of the drying channel 1 and is connected to the air outlet box 3 on the left side.

[0035] Furthermore, the air inlet of the dehumidifier 8 is connected to a first dehumidifying pipe 9 and a second dehumidifying pipe 10. The air inlet of the first dehumidifying pipe 9 extends to the bottom of the inner cavity of the drying channel 1, and the air inlet of the second dehumidifying pipe 10 extends to the top of the inner cavity of the drying channel 1.

[0036] The air inlet of the hot air central unit 5 is connected to a blower, and the air inlet of the blower is connected to a filter. The filter filters the air, and the blower draws the filtered air into the interior of the hot air central unit 5. At the same time, high-temperature steam from outside also enters the interior of the hot air central unit 5. The high-temperature steam and the air enter different channels inside the hot air central unit 5. The air absorbs the heat of the steam and converts it into high-temperature air. The high-temperature air enters the first hot air duct 6 and the second hot air duct 7, and the blower pressurizes the air.

[0037] The hot air central unit 5 uses steam as the main heat source. The steam is delivered at a pressure of 0.4-0.5 MPa and the steam flow rate is not less than 600 kg / h of saturated steam. Two DN50 branches are connected to the main steam pipeline. After passing through the proportional regulating valve, the steam enters the steam heat exchange coil on the hot air central unit 5. The air inlet fan blows the air out and it flows through the steam heat exchange coil and is heated. The heat is delivered into the drying oven through the air as a medium to provide heat for drying. After heat exchange, the steam becomes condensate. The condensate is discharged to the condensate main pipeline by the drain valve. The amount of steam entering the coil is controlled by the steam proportional regulating valve to adjust the temperature in the drying oven.

[0038] During operation, high-temperature and high-humidity air is extracted and replaced with low-temperature and low-humidity air. A sensible heat exchanger is installed in the air circulation path, where the high-temperature and high-humidity air exchanges heat with the low-temperature and low-humidity air, transferring the heat from the high-temperature and high-humidity air to the low-temperature and low-humidity air, thus achieving preliminary heat recovery and preheating of the fresh air. The air exhausted outdoors passes through the evaporator and then the heat is transferred to the condenser. The preheated air is then heated again by the condenser, achieving two-stage waste heat recovery of the exhaust air.

[0039] Six internal circulation fans are evenly installed inside the seven-layer dryer. The fans have a capacity of 200 m³ / h and are arranged in an insulated air cabinet within the drying chamber.

[0040] A humidity sensor is fixedly installed inside the drying channel 1. The humidity sensor is electrically connected to the controller on the drying channel 1. The humidity sensor transmits the detection signal to the controller. When the detected humidity is higher than the set humidity, the controller starts the dehumidifier 8. The dehumidifier 8 extracts moisture from the inside of the drying channel 1 through the first dehumidification pipe 9 and the second dehumidification pipe 10, preventing the food inside the drying channel 1 from becoming damp and improving the drying efficiency. During the process of the first dehumidification pipe 9 and the second dehumidification pipe 10 extracting moisture, the moisture inside the drying channel 1 is discharged through the top and bottom of its cavity. The moisture can also pass through the seven-layer conveying mechanism 2. The conveying mechanism 2 is provided with a dehumidification channel 208, which allows the moisture to pass through the middle part of the conveying mechanism 2, further improving the moisture discharge efficiency.

[0041] Furthermore, it also includes seven conveying mechanisms 2, which are fixedly installed in the middle of the inner cavity of the drying channel 1 for conveying food.

[0042] Furthermore, the conveying mechanism 2 includes a first conveying frame 201 and a second conveying frame 203, and a moisture absorption channel 208 is provided on the opposite side of the first conveying frame 201 and the second conveying frame 203.

[0043] Furthermore, a plurality of conveying cylinders 202 are rotatably connected to the first conveyor frame 201 and the second conveyor frame 203. The surfaces of the conveying cylinders 202 are respectively connected to a first conveyor belt 205 and a second conveyor belt 204. The first conveyor belt 205 is located inside the first conveyor frame 201, and the second conveyor belt 204 is located inside the second conveyor frame 203.

[0044] Furthermore, a fixed frame 207 is fixedly connected to the bottom of the first conveyor frame 201 and the second conveyor frame 203. A conveyor motor 206 is fixedly installed on one side of the fixed frame 207, and the output shaft of the conveyor motor 206 is fixedly connected to one end of the conveyor cylinder 202.

[0045] Furthermore, support frames are fixedly connected to both the left and right sides of the fixed frame 207, and the bottom of the support frame is fixedly connected to the bottom of the inner cavity of the drying channel 1 to support and fix the seven-layer conveying mechanism 2.

[0046] Furthermore, the conveyor cylinder 202 includes an active conveyor cylinder and a driven conveyor cylinder, and the output shaft of the conveyor motor 206 is fixedly connected to one end of the active conveyor cylinder.

[0047] Furthermore, the number of conveyor mechanisms 2 is seven, and the seven conveyor mechanisms 2 are arranged in different positions and staggered, so that the food in the first conveyor mechanism 2 can fall onto the second conveyor mechanism 2, and finally fall onto the seventh conveyor mechanism 2. As the conveyor mechanism 2 moves slowly, the food falls layer by layer. Each time it passes through a layer, it will be affected by hot air, thereby gradually reducing its moisture content.

[0048] During the operation of the conveying mechanism 2, the output shaft of the conveying motor 206 drives several conveying cylinders 202 to work synchronously. The conveying cylinders 202 drive the first conveyor belt 205 and the second conveyor belt 204 to rotate. The first conveyor belt 205 and the second conveyor belt 204 rotate in the inner cavity of the first conveyor frame 201 and the second conveyor frame 203 and slowly convey the food. During the conveying process, the hot air assembly 4 dries the food with hot air. The fixing frame 207 supports and fixes the bottom of the first conveyor frame 201 and the second conveyor frame 203.

[0049] Furthermore, it also includes an air outlet box 3, which is fixedly installed on the left and right sides of the inner cavity of the drying channel 1 to dry the food conveyed on the conveying mechanism 2.

[0050] Furthermore, a hot air assembly 4 is fixedly installed inside the air outlet box 3. The number of hot air assemblies 4 is several, and they are evenly arranged inside the air outlet box 3.

[0051] By setting air boxes 3 on the left and right sides of the inner cavity of the drying channel 1, the hot air assembly 4 can be installed and fixed to dry the food conveyed on the conveying mechanism 2 efficiently and evenly. The hot air inside the second hot air pipe 7 and the first hot air pipe 6 is discharged through the hot air assembly 4. Several hot air assemblies 4 are aligned with multiple positions on the left and right sides of the conveying mechanism 2 to dry the food on the conveying mechanism 2. The air box 3 has a through hole on the opposite side that is used in conjunction with the hot air assembly 4.

[0052] By setting up the hot air assembly 4, the speed and distribution of hot air flow can be changed to meet the hot air requirements of different drying stages of food. When the food first enters the dryer, the top conveyor mechanism 2 has a high moisture content. At this time, the hot air assembly 4 discharges a high hot air speed and a large hot air distribution to quickly remove the surface moisture of the food, promote surface evaporation, and prevent product quality degradation due to local over-humidity. As the food moves downward and passes through each layer of conveyor mechanism 2, its moisture content gradually decreases. The bottom hot air assembly 4 gradually reduces the hot air speed and hot air distribution area to gradually remove internal moisture rather than surface moisture. When the food moves to the bottom conveyor mechanism 2 and is close to the end of the drying process, there is very little remaining moisture in the material. At this time, the bottom hot air assembly 4 further reduces the hot air speed and hot air distribution area to avoid over-drying and damage to food quality, thus ensuring the final quality of the food.

[0053] Furthermore, the hot air assembly 4 includes a pipe body 401, one end of which is fixedly connected to an elastic air outlet head 402, and one end of which is fixedly connected to an elastic air outlet mesh 403. The elastic air outlet head 402 and the elastic air outlet mesh 403 extend to the outside of the air outlet box 3.

[0054] Furthermore, an air inlet pipe 413 is connected to the surface of the pipe body 401, and an electric wind speed regulating valve 412 is connected to one end of the air inlet pipe 413. The electric wind speed regulating valve 412 is connected to the first hot air pipe 6 and the second hot air pipe 7 through the pipeline system.

[0055] During the operation of the hot air assembly 4, the hot air from the first hot air pipe 6 and the second hot air pipe 7 enters the electric wind speed regulating valve 412 through the pipeline system. The electric wind speed regulating valve 412 regulates the hot air speed, and the regulated hot air enters the inner cavity of the pipe body 401, and then enters the elastic air outlet 402. The hot air in the inner cavity of the elastic air outlet 402 passes through the elastic air outlet net 403 and is discharged to dry the food on the conveying mechanism 2. The elastic air outlet net 403 filters the particulate matter in the hot air to prevent the food from being contaminated.

[0056] Furthermore, the other end of the pipe body 401 is fixedly connected to a housing 411. A mounting flange 410 is fixedly fitted on the surface of the housing 411. The mounting flange 410 is fixedly installed on the surface of the air outlet box 3. A hydraulic cylinder 409 is fixedly installed inside the housing 411. A sliding rod 406 is fixedly connected to the piston rod of the hydraulic cylinder 409. A sliding sleeve 408 is movably fitted on the surface of the sliding rod 406. The sliding sleeve 408 is fixedly installed inside the housing 411. Several adjusting parts 404 are installed at one end of the sliding rod 406. An elastic ring 405 is fixedly connected to one end of the adjusting part 404. The elastic ring 405 is fixedly installed on the right side of the inner wall of the elastic air outlet 402. Both the elastic ring 405 and the elastic air outlet 402 are made of rubber. A limiting part 407, which matches the number of adjusting parts 404, is fixedly installed on the inner wall of the pipe body 401. The surface of the limiting part 407 is movably connected to the inner wall of the elastic air outlet 402 to limit the elastic air outlet 402.

[0057] Furthermore, the adjusting component 404 includes a bent rod 415, which is fixedly connected to one end of the slide rod 406. Rotating rods 416 are rotatably connected to both the front and rear sides of the bent rod 415. A rotating component 417 is rotatably connected to one end of the rotating rod 416, and the rotating component 417 is fixedly connected to the left side of the elastic ring 405.

[0058] Furthermore, a locking head 414 is provided at one end of the inner side of the limiting member 407. The locking head 414 is located outside the rotating rod 416 to limit it, so that it can rotate inward during the leftward movement.

[0059] When adjusting the air distribution of the hot air assembly 4, the piston rod of the hydraulic cylinder 409 drives the slide rod 406 to slide on the inner wall of the sliding sleeve 408. The slide rod 406 drives the bent rod 415 to move to the left. The bent rod 415 drives the rotating rod 416 and the rotating component 417 to move synchronously. When the rotating rod 416 moves to the left limit position, it contacts the locking head 414. The locking head 414 limits the rotating rod 416 to rotate inward. The rotating rod 416 drives the rotating component 417 to rotate inward. The rotating component 417 drives the elastic ring 405 to rotate inward. The elastic ring 405 deforms and retracts, causing the elastic air outlet 402 and the elastic air outlet net 403 to deform synchronously, making the elastic air outlet net 403 concave inward. During the concavation of the elastic air outlet 402, the surface of the limiting member 407 limits the inner wall of the elastic air outlet 402 to prevent it from deforming to the left. The concavity of the elastic air outlet net 403 reduces the air outlet area. When it is necessary to increase the air outlet area, the piston rod of the hydraulic cylinder 409 is extended to drive the elastic air outlet 402 and the elastic air outlet net 403 to expand outward.

[0060] Furthermore, the flexible air outlet 402 and the flexible air outlet mesh 403 are in the shape of one of the following: circle, rectangle, and square.

[0061] When the flexible air outlet 402 and the flexible air outlet mesh 403 are circular, several adjusting components 404 are installed. When the flexible air outlet 402 and the flexible air outlet mesh 403 are rectangular, two adjusting components 404 are installed opposite to each other. When the flexible air outlet 402 and the flexible air outlet mesh 403 are square, four adjusting components 404 are installed opposite to each other to support and adjust the flexible air outlet 402 and the flexible air outlet mesh 403 of different shapes.

Claims

1. A seven-layer dryer for food production, characterized in that: include, Drying channel (1), on which a hot air central unit (5) and a dehumidifier (8) are connected; The conveying mechanism (2) consists of seven parts and is fixedly installed in the middle of the inner cavity of the drying channel (1) for conveying food. Air outlet box (3), the air outlet box (3) is fixedly installed on the left and right sides of the inner cavity of the drying channel (1) to dry the food conveyed on the conveying mechanism (2); The conveying mechanism (2) includes a first conveying frame (201) and a second conveying frame (203), and a moisture absorption channel (208) is provided on the opposite side of the first conveying frame (201) and the second conveying frame (203). A hot air assembly (4) is fixedly installed in the inner cavity of the air outlet box (3). The number of hot air assemblies (4) is several, and they are evenly arranged in the inner cavity of the air outlet box (3). The hot air assembly (4) includes a pipe body (401), one end of which is fixedly connected to an elastic air outlet head (402), and one end of which is fixedly connected to an elastic air outlet mesh (403). The elastic air outlet head (402) and the elastic air outlet mesh (403) extend to the outside of the air outlet box (3). The other end of the pipe body (401) is fixedly connected to the housing (411). The surface of the housing (411) is fixedly fitted with a mounting flange (410). The mounting flange (410) is fixedly installed on the surface of the air outlet box (3). The inner cavity of the housing (411) is fixedly installed with a hydraulic cylinder (409). The piston rod of the hydraulic cylinder (409) is fixedly connected with a sliding rod (406). The surface of the sliding rod (406) is movably fitted with a sliding sleeve (408). The sliding sleeve (408) is fixedly installed in the inner cavity of the housing (411). One end of the sliding rod (406) is equipped with several adjusting parts (404). One end of the adjusting part (404) is fixedly connected with an elastic ring (405). The elastic ring (405) is fixedly installed on the right side of the inner wall of the elastic air outlet (402). Both the elastic ring (405) and the elastic air outlet (402) are made of rubber. Material: The inner wall of the tube body (401) is fixedly installed with a limiting member (407) that matches the number of adjusting members (404). The surface of the limiting member (407) is movably connected to the inner wall of the elastic air outlet (402) to limit the elastic air outlet (402). The adjusting member (404) includes a bent rod (415), which is fixedly connected to one end of the sliding rod (406). The front and rear sides of the bent rod (415) are rotatably connected with rotating rods (416). One end of the rotating rod (416) is rotatably connected with a rotating member (417). The rotating member (417) is fixedly connected to the left side of the elastic ring (405). One end of the inner side of the limiting member (407) is provided with a locking head (414). The locking head (414) is located outside the rotating rod (416) to limit it, so that it can rotate inward during the leftward movement. The seven conveyor mechanisms (2) are arranged in different positions and are staggered so that the food from the first conveyor mechanism (2) can fall onto the second conveyor mechanism (2) and eventually fall onto the seventh conveyor mechanism (2).

2. The seven-layer dryer for food production as described in claim 1, characterized in that: The air outlet of the hot air central unit (5) is connected to a first hot air pipe (6) and a second hot air pipe (7). The air outlet of the first hot air pipe (6) extends to the top of the inner cavity of the drying channel (1) and is connected to the air outlet box (3) on the right side. The air outlet of the second hot air pipe (7) extends to the bottom of the inner cavity of the drying channel (1) and is connected to the air outlet box (3) on the left side.

3. The seven-layer dryer for food production as described in claim 1, characterized in that: The air inlet of the dehumidifier (8) is connected to a first dehumidifying pipe (9) and a second dehumidifying pipe (10). The air inlet of the first dehumidifying pipe (9) extends to the bottom of the inner cavity of the drying channel (1), and the air inlet of the second dehumidifying pipe (10) extends to the top of the inner cavity of the drying channel (1).

4. The seven-layer dryer for food production as described in claim 3, characterized in that: A plurality of conveying cylinders (202) are rotatably connected to the first conveyor frame (201) and the second conveyor frame (203). The surfaces of the conveying cylinders (202) are respectively connected to a first conveyor belt (205) and a second conveyor belt (204). The first conveyor belt (205) is located inside the first conveyor frame (201), and the second conveyor belt (204) is located inside the second conveyor frame (203).

5. The seven-layer dryer for food production as described in claim 4, characterized in that: The bottom of the first conveyor frame (201) and the second conveyor frame (203) are fixedly connected to a fixed frame (207). A conveyor motor (206) is fixedly installed on one side of the fixed frame (207). The output shaft of the conveyor motor (206) is fixedly connected to one end of the conveyor cylinder (202).

6. The seven-layer dryer for food production as described in claim 5, characterized in that: The surface of the pipe body (401) is connected to an air inlet pipe (413), and one end of the air inlet pipe (413) is connected to an electric wind speed regulating valve (412). The electric wind speed regulating valve (412) is connected to the first hot air pipe (6) and the second hot air pipe (7) through the pipeline system.

7. The seven-layer dryer for food production as described in claim 6, characterized in that: The elastic air outlet (402) and the elastic air outlet net (403) are in the shape of one of the following: circle, rectangle and square.

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