Multi-layer air cooling device for quick-frozen food processing

Abstract

The utility model discloses a kind of multilayer air cooling devices for quick-frozen food processing, it is related to quick-frozen food processing equipment technical field, for the problems of low cooling efficiency, poor temperature uniformity, poor structure adaptability and inconvenient maintenance of existing multilayer air cooling devices for quick-frozen food processing in prior art, the following scheme is presented, including U-shaped frame, equidistantly distributed conveyors are fixed between the two side inner walls of U-shaped frame along vertical direction, and equidistantly distributed air-blowing assembly is fixed on the top of U-shaped frame, the air-blowing assembly includes installation shell.The utility model is high in cooling efficiency and temperature uniformity, energy consumption is significantly reduced, through multilayer conveyor three-dimensional layout and optimization air path design, solve the problem that traditional device cools slowly, temperature difference is big, multilayer conveyor forms "S" type conveying path, food cooling path is lengthened, air-blowing assembly equidistantly distributes, cooperation staggered air outlet pipe realizes 360 ° wind force coverage, and cooling uniformity is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of quick-frozen food processing equipment, and in particular to a multi-layer air-cooling device for quick-frozen food processing. Background Technology

[0002] Multi-layer air-cooling units for quick-frozen food processing are core cooling equipment in quick-frozen food production lines. Their main function is to transport freshly formed or pre-processed food through a multi-layer conveyor structure, simultaneously utilizing airflow to rapidly remove surface heat from the food, quickly lowering its temperature to the suitable freezing range, thus laying the foundation for subsequent quick-freezing processes. This equipment must possess characteristics such as high cooling efficiency, good temperature uniformity, continuous and stable conveying, and adaptability to different food sizes. It is widely used in quick-frozen food production scenarios such as food processing plants and central kitchens for restaurants, and is a crucial guarantee for ensuring the quality of quick-frozen foods and extending their shelf life.

[0003] However, existing multi-layer air-cooling devices for quick-frozen food processing have significant shortcomings in practical use.

[0004] On the one hand, the cooling efficiency is low and the temperature uniformity is poor: traditional devices mostly adopt single-layer or double-layer conveying structures, the food cooling path is short, the blowing components are mostly fixed on one side, the air force coverage is uneven, and local cooling is easily substandard; the air outlet structure design is unreasonable, hot air accumulates inside the device, and the cooling air circulation efficiency is low.

[0005] On the other hand, the structure is poorly adaptable and inconvenient to maintain: the conveyor of traditional devices has a fixed conveying direction, and the connection between adjacent layers is not smooth, which can easily cause food to get stuck or fall. The filter structure of the blower component is complicated to disassemble and assemble, and the air outlet component and the conveyor frame are mostly fixed by welding. After damage, the whole thing needs to be replaced, which is costly to maintain and affects the production schedule. Utility Model Content

[0006] In view of the shortcomings of the prior art, this utility model provides a multi-layer air-cooling device for quick-frozen food processing, which overcomes the shortcomings of the prior art and effectively solves the problems of low cooling efficiency, poor temperature uniformity, poor structural adaptability and inconvenient maintenance of the existing multi-layer air-cooling devices for quick-frozen food processing.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A multi-layer air-cooling device for quick-frozen food processing includes a U-shaped frame. Conveyors are vertically mounted and fixed between the inner walls of both sides of the U-shaped frame at equal intervals. Air blowing assemblies are vertically mounted and fixed on the top of the U-shaped frame, each air blowing assembly including a mounting shell, a fan mounted and fixed inside the mounting shell, and a filter ring inserted into the top of the mounting shell. Air outlet assemblies are vertically mounted on the back of the U-shaped frame at equal intervals, each air outlet assembly including a strip-shaped shell, air outlet pipes equally distributed on one outer wall of the strip-shaped shell, a first connecting pipe equally distributed on the top of the strip-shaped shell, and air outlet pipes equally distributed on the bottom of the strip-shaped shell. The second connecting pipe connects the uppermost air outlet assembly and the blower assembly with an L-shaped pipe, and the two adjacent air outlet assemblies are connected with Z-shaped pipes; the U-shaped frame is welded from Q235 steel plate, with dimensions of 2000×800×1500mm, and undergoes aging treatment after welding to relieve stress, and is coated with anti-rust paint; the conveyor adopts a stainless steel mesh belt structure with a mesh belt aperture of 5×5mm, an adjustable conveying speed of 0.5-2m / min, an adjacent layer spacing of 300mm, and a total of 4 layers; the fan is a centrifugal fan with an air volume of 1500m³ / h, an air pressure of 500Pa, and a power of 0.75kW.

[0008] Preferably, the bottom ends of the U-shaped frame are welded and fixed with bases, and the conveyors distributed vertically and vertically have opposite conveying directions, with a gap between the tail end of the conveyor belt and the inner wall of the U-shaped frame. The base is forged from Q235 steel plate, with dimensions of 300×300×50mm. Anti-slip pads are welded to the bottom and it is fixed to the ground with expansion bolts. The adjacent conveyors convey in opposite directions to form an "S" shaped conveying path. The gap between the tail end and the inner wall of the U-shaped frame is 50mm to ensure that the food falls smoothly to the lower conveyor and avoids jamming.

[0009] Preferably, a feed inlet is provided at the top of one side of the outer wall of the U-shaped frame, and a first external conveying device is connected to the feed inlet. The discharge port of the external conveying device is located directly above the uppermost conveyor, and a second external conveying device is provided below the discharge port of the lowermost conveyor. The feed inlet is 500×300mm in size, with rounded edges to prevent scratching the food. A rubber sealing gasket is installed at the junction of the first external conveyor and the feed inlet to reduce cold air leakage. The distance between the second external conveyor and the bottom conveyor's discharge port is 100mm to ensure that the food is received stably.

[0010] Preferably, the bottom of one side of the outer wall of the mounting housing is inserted into the top of the L-shaped tube, and the bottom of the L-shaped tube is inserted into the top of the first connecting tube in the uppermost air outlet assembly. The mounting housing is made of stainless steel and measures 200×200×300mm. The inner wall is lined with sound-absorbing cotton to reduce noise. The L-shaped pipe is made of PVC and has a diameter of 100mm. Quick connectors are provided at both ends. After insertion, it is locked with hose clamps. The sealing performance is ≤5Pa leakage.

[0011] Preferably, the first connecting pipe and the second connecting pipe are staggered, and the top end of the Z-shaped pipe is inserted into the bottom end of the second connecting pipe, and the bottom end of the Z-shaped pipe is inserted into the top end of the first connecting pipe. Both the first and second connecting pipes are made of PVC, with a diameter of 100mm and an interleaved spacing of 150mm; the Z-shaped pipe is made of PVC, with a diameter of 100mm, stepped interfaces at both ends, an insertion depth of ≥20mm, and is sealed with a matching sealing ring.

[0012] Preferably, a sealing plug is inserted into the bottom of the second connecting pipe in the lowermost air outlet assembly, and L-shaped blocks are welded and fixed at equal intervals on both sides of the back of the U-shaped frame along the vertical direction, with the L-shaped blocks forming an insertion fit with the strip shell; The sealing plug is made of silicone with a Shore hardness of 40A and a sealing pressure ≥0.1MPa; the L-shaped block is made of Q235 steel with dimensions of 80×50×10mm, galvanized for rust prevention, and has a clearance of ≤0.5mm between it and the strip shell, and is fixed by hand-tightening bolts.

[0013] The beneficial effects of this utility model are as follows: With high cooling efficiency and uniform temperature, energy consumption is significantly reduced. Through the three-dimensional layout of multi-layer conveyors and optimized air path design, the problems of slow cooling and large temperature difference in traditional devices are solved. The multi-layer conveyors form an "S"-shaped conveying path, extending the food cooling path. The blower components are evenly distributed and, together with the staggered air outlet pipes, achieve 360° air force coverage, improving cooling uniformity. The L-shaped pipes and Z-shaped pipes construct a layered air circulation system, allowing hot air to be quickly discharged without accumulation, improving cooling air circulation efficiency and reducing energy consumption per unit product. With stable and highly adaptable conveying, convenient and low-cost maintenance, it improves the problems of jamming and difficult maintenance of traditional devices by relying on reverse conveying and modular structure design. The gap design of the reverse conveying of adjacent conveyors ensures smooth and jam-free food drop, improving stability and adaptability to different food sizes, thus expanding the range of applications. The air outlet component is fixed by L-shaped block insertion and can be replaced individually after damage, reducing maintenance costs. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of a multi-layer air-cooling device for quick-frozen food processing proposed in this utility model. Figure 2 This is a schematic diagram of the blowing component structure of a multi-layer air-cooling device for quick-frozen food processing proposed in this utility model; Figure 3This is a schematic diagram of the air outlet component structure of a multi-layer air-cooling device for quick-frozen food processing proposed in this utility model; Figure 4 This is a schematic diagram of the back structure of a U-shaped frame of a multi-layer air-cooling device for quick-frozen food processing proposed in this utility model.

[0015] In the diagram: 1. U-shaped frame; 2. Base; 3. Conveyor; 4. Blower assembly; 5. Mounting housing; 6. Fan; 7. Filter ring; 8. L-shaped tube; 9. Air outlet assembly; 10. Strip shell; 11. Air outlet duct; 12. First connecting pipe; 13. Second connecting pipe; 14. L-shaped block; 15. Z-shaped tube. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Example

[0017] Reference Figure 1-4 A multi-layer air-cooling device for quick-frozen food processing includes a U-shaped frame 1. Conveyors 3 are vertically mounted and fixed between the inner walls of both sides of the U-shaped frame 1 at equal intervals. Air blowing assemblies 4 are vertically mounted and fixed on the top of the U-shaped frame 1, each air blowing assembly 4 including a mounting shell 5, a fan 6 installed and fixed inside the mounting shell 5, and a filter ring 7 inserted into the top of the mounting shell 5. Air outlet assemblies 9 are vertically mounted on the back of the U-shaped frame 1, each air outlet assembly 9 including a strip-shaped shell 10, air outlet pipes 11 equidistantly distributed on one side of the outer wall of the strip-shaped shell 10, a first connecting pipe 12 equidistantly distributed on the top of the strip-shaped shell 10, and other air outlet pipes 11 equidistantly distributed on the outer wall of the strip-shaped shell 10. The second connecting pipe 13 at the bottom of the shell 10, the uppermost air outlet component 9 and the blowing component 4 are connected by an L-shaped pipe 8, and two adjacent air outlet components 9 are connected by a Z-shaped pipe 15; the U-shaped frame 1 is made of Q235 steel plate welded into shape, with dimensions of 2000×800×1500mm, and is subjected to aging treatment after welding to eliminate stress, and the surface is sprayed with anti-rust paint; the conveyor 3 adopts a stainless steel mesh belt structure, with a mesh belt aperture of 5×5mm, a conveying speed adjustable from 0.5-2m / min, an adjacent layer spacing of 300mm, and a total of 4 layers; the fan 6 is a centrifugal fan with an air volume of 1500m³ / h, an air pressure of 500Pa, and a power of 0.75kW.

[0018] The bottom ends of the U-shaped frame 1 are welded and fixed with bases 2. The conveyors 3, which are distributed vertically, have opposite conveying directions. There is a gap between the tail end of the conveyor belt of the conveyor 3 and the inner wall of the U-shaped frame 1. The base 2 is forged from Q235 steel plate with dimensions of 300×300×50mm. The bottom is welded with anti-slip pads and fixed to the ground with expansion bolts. The adjacent conveyors 3 have opposite conveying directions to form an "S" shaped conveying path. The gap between the tail end and the inner wall of the U-shaped frame 1 is 50mm to ensure that the food falls smoothly to the lower conveyor 3 and avoids jamming. A feeding port is provided at the top of one side of the outer wall of the U-shaped frame 1. A first external conveying device is connected to the feeding port. The discharge port of the external conveying device is located directly above the uppermost conveyor 3. A second external conveying device is located below the discharge port of the lowermost conveyor 3. The feeding port is 500×300mm in size, with rounded edges to avoid scratching the food. A rubber sealing gasket is installed at the junction of the first external conveying device and the feeding port to reduce cold air leakage. The distance between the second external conveying device and the discharge port of the lowermost conveyor 3 is 100mm to ensure stable food reception. The bottom of one side of the outer wall of the mounting shell 5 is inserted into the top of the L-shaped pipe 8. The bottom end of the L-shaped pipe 8 is inserted into the top of the first connecting pipe 12 in the uppermost air outlet assembly 9. The mounting shell 5 is made of stainless steel and measures 200×200×300mm. Sound insulation cotton is pasted on the inner wall to reduce noise. The L-shaped pipe 8 is made of PVC and has a diameter of 100mm. Quick connectors are provided at both ends. After insertion, it is locked by hose clamps, with a sealing performance of ≤5Pa leakage.

[0019] The first connecting pipe 12 and the second connecting pipe 13 are staggered. The top end of the Z-shaped pipe 15 is inserted into the bottom end of the second connecting pipe 13, and the bottom end of the Z-shaped pipe 15 is inserted into the top end of the first connecting pipe 12. The first connecting pipe 12 and the second connecting pipe 13 are both made of PVC with a diameter of 100mm and a staggered spacing of 150mm. The Z-shaped pipe 15 is made of PVC with a diameter of 100mm. It has stepped interfaces at both ends with an insertion depth of ≥20mm and is sealed with a sealing ring. The bottom of the second connecting pipe 13 in the lowest air outlet assembly 9 is fitted with a sealing plug. L-shaped blocks 14 are welded and fixed at equal intervals on both sides of the back of the U-shaped frame 1 along the vertical direction. The L-shaped blocks 14 and the strip shell 10 form an interlocking fit. The sealing plug is made of silicone with a Shore hardness of 40A and a sealing pressure ≥0.1MPa. The L-shaped blocks 14 are made of Q235 steel with dimensions of 80×50×10mm. The surface is galvanized for rust prevention. The gap between the L-shaped blocks 14 and the strip shell 10 is ≤0.5mm. They are fixed by hand-tightening bolts.

[0020] U-shaped frame and base assembly: U-shaped frame 1 is made of Q235 steel plate, cut to size, and then welded together by submerged arc welding. The welding sequence follows the principle of main frame first, then auxiliary parts, to avoid welding deformation. After welding, U-shaped frame 1 is placed in an aging furnace for aging treatment at 200℃ for 4 hours to eliminate welding stress. Subsequently, the surface of U-shaped frame 1 is sandblasted to remove rust, and then coated with two layers of anti-rust paint and one layer of topcoat, with a paint film thickness ≥80μm. Base 2 is forged from Q235 steel plate and welded to both ends of the bottom of U-shaped frame 1 by fillet welds, with a weld leg height of 8mm. After welding, it is ground smooth. A 5mm thick rubber anti-slip pad is attached to the bottom of base 2 to ensure that the device is placed stably without slipping.

[0021] Conveyor Installation and Commissioning: Conveyor 3 adopts a stainless steel mesh belt structure. First, fix the support of conveyor 3 to the inner walls of both sides of the U-shaped frame 1 with expansion bolts. The support installation height is positioned according to the layer spacing of 300mm, ensuring that the levelness of the 4 layers of conveyors 3 is ≤0.2mm / m. When installing the mesh belt, adjust the parallelism between the drive roller and the driven roller to ≤0.1mm to avoid the mesh belt running off-center. Set the conveying direction of adjacent layers of conveyors 3 to opposite directions to form an "S" shaped conveying path. Adjust the uppermost conveyor 3 to align with the feed inlet, and the lowermost conveyor 3 to align with the second external conveying equipment. After installation, conduct a trial run, adjusting the conveying speed from 0.5m / min to 2m / min, and check the smoothness of the mesh belt operation to ensure there are no jams or off-center phenomena.

[0022] Assembly and Fixing of the Blower Components: The mounting housing 5 is made of stainless steel sheet, bent and welded, with 5mm thick sound insulation cotton pasted on the inner wall, and fixed with adhesive. The blower 6 is bolted to the inside of the mounting housing 5, with the air outlet of the blower 6 facing downwards and aligned with the bottom air outlet of the mounting housing 5. The filter ring 7 is made of stainless steel filter mesh and plastic frame, injection molded, with a filter mesh size of 100 mesh, and is installed on the top of the mounting housing 5 by plugging in, ensuring a firm installation and easy disassembly. The assembled blower components 4 are bolted to the top of the U-shaped frame 1 at equal intervals of 300mm. The vertical distance between the air outlet of the blower component 4 and the conveyor belt of the conveyor 3 is adjusted to 200mm to ensure that the airflow evenly covers the surface of the conveyor belt.

[0023] Air outlet assembly and duct connection: The strip shell 10 is injection molded from PVC sheet. The air outlet ducts 11 are integrally formed on one side of the strip shell 10 at 150mm intervals, facing the conveyor 3. The first connecting pipe 12 and the second connecting pipe 13 are fixed to the top and bottom of the strip shell 10 by heat fusion connection, ensuring that they are staggered. The quick connectors at both ends of the L-shaped pipe 8 are respectively connected to the bottom interface of the mounting shell 5 and the top of the first connecting pipe 12 of the uppermost air outlet assembly 9, and then locked with hose clamps. The stepped interfaces at both ends of the Z-shaped pipe 15 are respectively inserted into the bottom of the upper second connecting pipe 13 and the top of the lower first connecting pipe 12. Before insertion, sealant is applied to the interface to ensure sealing performance. A sealing plug is inserted into the bottom of the second connecting pipe 13 of the lowermost air outlet assembly 9 to ensure airflow sealing.

[0024] Air outlet assembly fixing and overall calibration: L-shaped block 14 is made of Q235 steel and galvanized. It is fixed to both sides of the back of U-shaped frame 1 by welding. During welding, ensure that L-shaped block 14 corresponds to the layer of conveyor 3. Insert the assembled air outlet assembly 9 into L-shaped block 14, adjust the position so that the distance between air outlet pipe 11 and conveyor belt 3 is 150mm, and fix strip shell 10 to L-shaped block 14 by hand-tightening bolts. Overall calibration: Use a level to check that the levelness of U-shaped frame 1 is ≤0.1mm / m, adjust the expansion bolts of base 2 to ensure stability; check the sealing of all pipeline connections, and conduct a pressure test at 0.1MPa, holding the pressure for 30 minutes without leakage; test all motors to ensure smooth operation without abnormal noise.

[0025] Linkage Debugging and Performance Testing: Connect the first external conveyor to the feed inlet, adjust the discharge port to be directly above the uppermost conveyor 3, and install a rubber sealing gasket at the connection point. Place the second external conveyor 100mm below the discharge port of the lowermost conveyor 3. Start-up and Linkage Debugging: Set the conveying speed to 1m / min, start the fan 6, and measure the uniformity of the wind speed on the surface of the conveyor belt of conveyor 3, ensuring that the wind speed deviation at each point is ≤5%. Place test food items and continuously convey 100 items, observing the conveying and dropping of the food on each layer of conveyor 3, ensuring no jamming or dropping. Performance Testing: Test the cooling efficiency by cooling food from an initial temperature of 25℃ to 5℃, recording the time as 8 minutes, which is 50% shorter than traditional devices; after 24 hours of continuous operation, the failure rate is ≤0.5%; the filter ring 7 disassembly and cleaning time is ≤5 minutes, meeting design requirements. After all tests are passed, label with safety signs and operating instructions.

[0026] Working principle 1. Device Start-up and Parameter Setting: Before operation, the operator checks the status of each component of the device: confirming that the filter ring 7 is securely installed, the pipeline connections are sealed, and the conveyor belt 3 is undamaged. Start the device through the control panel and set the operating parameters: set the conveying speed according to the type of food (e.g., 1 m / min for dumplings, 1.5 m / min for meatballs); set the fan speed 6 according to the cooling requirements (corresponding to an air volume of 1500 m³ / h). Start the first and second external conveying devices to match their conveying speed with the device's speed, ensuring continuous and stable feeding and discharging.

[0027] 2. Food Feeding and Multi-Layer Conveying: The first external conveying device transports the food to be cooled from the feed inlet to the top conveyor 3. The food moves along the top conveyor 3 towards one side of the U-shaped frame 1. When the food reaches the tail end of the top conveyor 3, it falls smoothly from a 50mm gap to the second conveyor 3. Since the second conveyor 3 conveys in the opposite direction, the food moves in the opposite direction to the other tail end, and then falls to the third conveyor 3, and so on. Through the multi-layer reverse conveyors 3, an "S"-shaped conveying path is formed. The food is fully exposed to the cooling air during the conveying process, extending the cooling time.

[0028] 3. Three-dimensional air cooling and air circulation: After the fan 6 starts, external air is filtered by the filter ring 7 at the top of the mounting housing 5 to remove impurities and dust, preventing food contamination before entering the fan 6. The fan 6 pressurizes the cold air and blows it out from the air outlet at the bottom of the mounting housing 5, blowing vertically towards the food surface on the conveyor 3 below. The cold air carries away the heat from the food surface, forming hot air, which is drawn into the strip housing 10 by the air outlet pipes 11 on both sides. The hot air from the uppermost air outlet assembly 9 flows back to the mounting housing 5 for recooling via the first connecting pipe 12 and the L-shaped pipe 8; the hot air from the lower air outlet assembly 9 is transported to the upper first connecting pipe 12 via the second connecting pipe 13 and the Z-shaped pipe 15, and finally merges into the main air circulation path, achieving efficient recycling of cold air and reducing energy loss.

[0029] 4. Cooling Completion and Discharge Collection: After the food is conveyed in an "S" shape by four layers of conveyors 3 and subjected to 8 minutes of continuous air cooling, its temperature drops from the initial 25℃ to 5℃, meeting the cooling requirements. The cooled food reaches the bottom conveyor 3 and moves with it to the end, falling onto the second external conveyor, which then transports it to the subsequent quick-freezing process. During operation, the operator monitors the food conveying status in real time. If any blockage occurs, the system can be paused using the emergency stop button, cleared, and then restarted.

[0030] 5. Shutdown Maintenance and Cleaning: After the operation is completed, first shut down the first external conveying equipment. After all the food in the device has been conveyed to the second external conveying equipment, shut down conveyor 3, fan 6, and the second external conveying equipment in sequence. Maintenance and Cleaning: Remove the filter ring 7 from the top of the mounting housing 5, blow away impurities on the filter screen with compressed air, clean it, and then reconnect it; check whether there is food residue in the exhaust pipe 11, and clean it with a brush; check the sealing of the pipe connections, and replace the sealing rings in time if there is any leakage; check the tension of the conveyor belt 3 once a week, and adjust it by adjusting the screw if it is loose to ensure stable conveying.

[0031] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A multi-layer air-cooling device for quick-frozen food processing, comprising a U-shaped frame (1), characterized in that, Conveyors (3) are installed and fixed at equal intervals along the vertical direction between the inner walls of the two sides of the U-shaped frame (1), and air blowing components (4) are installed and fixed at equal intervals on the top of the U-shaped frame (1). The air blowing components (4) include a mounting shell (5), a fan (6) installed and fixed in the mounting shell (5), and a filter ring (7) inserted into the top of the mounting shell (5). Air outlet components (9) are arranged at equal intervals along the vertical direction on the back of the U-shaped frame (1), and the air outlet components (9) include a strip shell (10), an air outlet pipe (11) distributed at equal intervals on one side of the outer wall of the strip shell (10), a first connecting pipe (12) distributed at equal intervals on the top of the strip shell (10), and a second connecting pipe (13) distributed at equal intervals on the bottom of the strip shell (10). An L-shaped pipe (8) is connected between the uppermost air outlet component (9) and the air blowing components (4), and a Z-shaped pipe (15) is connected between two adjacent air outlet components (9).

2. The multi-layer air-cooling device for quick-frozen food processing according to claim 1, characterized in that, The bottom ends of the U-shaped frame (1) are welded and fixed with bases (2), and the conveyors (3) distributed vertically and vertically are in opposite directions. There is a gap between the tail end of the conveyor belt of the conveyor (3) and the inner wall of the U-shaped frame (1).

3. The multi-layer air-cooling device for quick-frozen food processing according to claim 1, characterized in that, The top of one side of the outer wall of the U-shaped frame (1) is provided with a feeding port, and a first external conveying device is attached to the feeding port. The discharge port of the external conveying device is located directly above the uppermost conveyor (3), and a second external conveying device is provided below the discharge port of the lowermost conveyor (3).

4. The multi-layer air-cooling device for quick-frozen food processing according to claim 1, characterized in that, The bottom of one side of the outer wall of the mounting housing (5) is inserted into the top of the L-shaped tube (8), and the bottom of the L-shaped tube (8) is inserted into the top of the first connecting tube (12) in the uppermost air outlet assembly (9).

5. A multi-layer air-cooling device for quick-frozen food processing according to claim 1, characterized in that, The first connecting pipe (12) and the second connecting pipe (13) are staggered, and the top end of the Z-shaped pipe (15) is inserted into the bottom end of the second connecting pipe (13), and the bottom end of the Z-shaped pipe (15) is inserted into the top end of the first connecting pipe (12).

6. A multi-layer air-cooling device for quick-frozen food processing according to claim 1, characterized in that, The bottom of the second connecting pipe (13) in the air outlet assembly (9) is fitted with a sealing plug, and L-shaped blocks (14) are welded and fixed at equal intervals on both sides of the back of the U-shaped frame (1) along the vertical direction. The L-shaped blocks (14) and the strip shell (10) form an interlocking fit.

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