A drum-type food conveying device

Abstract

The application discloses a drum-type food conveying device, which comprises a drum-type conveyor body, a cover body is arranged on the upper portion of the drum-type conveyor body, the drum-type conveyor body comprises a drum group composed of a plurality of hollow temperature control drums arranged in parallel, and a soft-tooth raking roller is arranged above the feeding end of the drum group. The soft-tooth raking roller is arranged above the feeding end of the drum group, the food-grade silicone rubber soft teeth rotate at a slow speed in the same direction, the stacked coconut meat is gently spread open and flattened into a single layer, the uneven freezing and the problem of discharging in lumps caused by stacking are reduced from the source, the adjusting mechanism is designed in linkage of a lifting unit and a tensioning unit and is synchronously driven by the same servo power source, the length change of the chain is compensated in real time while the height of the soft-tooth raking roller is adjusted, the chain always maintains constant tension, tooth skipping or relaxation and falling are avoided, the structure is compact, the adjusting precision is high, and the flattening demand of different specifications of coconut meat can be met.

Description

Technical Field

[0001] This invention relates to the field of intelligent agricultural product conveying equipment technology, and in particular to a roller-type food conveying device. Background Technology

[0002] As agricultural product processing moves towards large-scale and intelligent operations, conveying equipment, as a crucial link connecting various processes, directly impacts production line efficiency and product quality through its specialization and stability. In coconut meat processing, the coconut meat, after manual shelling and extraction, is tender, crisp, irregularly shaped, and contains sugar and water on its surface, requiring high integrity and stability in conveying. Simultaneously, coconut meat is difficult to preserve, necessitating liquid nitrogen flash freezing to maintain its freshness and flavor, requiring the conveying device to operate continuously in extreme low-temperature environments. In existing production lines, mesh belt conveyors are prone to jamming and slippage, while spiral conveyors are complex and easily damaged at bends. Roller conveyors offer stable transport and a simple structure, suitable for conveying blocky agricultural products like coconut meat. However, conventional roller conveyors are mostly designed for ambient or refrigerated conditions, and their application in the aforementioned extreme low-temperature environments presents a series of unique challenges.

[0003] In extremely low-temperature environments, coconut meat tends to pile up at the feed end of the drum during feeding. The large contact area of ​​the piled coconut meat and uneven cold air penetration not only lead to uneven freezing but also cause residual moisture and sugar on adjacent coconut meat contact surfaces to freeze together during the quick-freezing process. When discharged, the coconut meat sticks together and needs to be broken apart manually, increasing the risk of secondary contamination and breakage. At the same time, the drum surface is cooled to a temperature far below the freezing point. Free water and sugar on the surface of the coconut meat freeze rapidly upon contact with the drum, forming a low-temperature freeze-sticking phenomenon. This sticks the coconut meat to the drum surface and is forcibly peeled off as the drum rotates, resulting in breakage and fragmentation. The supercooled nitrogen in the tunnel and the water vapor generated by the sublimation of the coconut meat condense and frost on the low-temperature drum surface. The accumulation of frost increases the drum diameter and reduces the gap, further aggravating the compression and breakage. The frost layer can also fall off and mix into the product, forming impurities.

[0004] In summary, the existing technology lacks a roller conveyor device that can first turn and spread the coconut meat in the feed stack, and then effectively prevent the coconut meat from freezing and sticking, the roller from frosting, and the material from clumping under the extreme low temperature conditions of liquid nitrogen flash freezing. This has become a key technical bottleneck restricting the application of roller conveyor technology in the field of high-end agricultural product processing. Summary of the Invention

[0005] One object of the present invention is to provide a roller-type food conveying device to solve the problems mentioned in the background art.

[0006] According to an embodiment of the present invention, a roller-type food conveying device includes a roller conveyor body, a cover installed on the upper part of the roller conveyor body, and a roller group composed of multiple parallel hollow temperature-controlled rollers. A soft-tooth feeding roller is provided above the feed end of the roller group. The soft-tooth feeding roller is linked to the roller group through a transmission mechanism. The transmission mechanism includes a first sprocket, a chain, and a second sprocket. The first sprocket is fixed to the shaft end of the first hollow temperature-controlled roller at the feed end, and the second sprocket is fixed to the shaft end of the soft-tooth feeding roller. The chain meshes with the first sprocket and the second sprocket respectively, so that the soft-tooth feeding roller and the hollow temperature-controlled roller rotate in the same direction. The end of the soft-tooth feeding roller is provided with an adjustment mechanism, which includes a lifting unit and a tensioning unit that are linked together. The lifting unit adjusts the height of the soft-tooth feeding roller, and the tensioning unit adjusts the tension of the chain simultaneously when the height is adjusted. The conveying device also includes a heat-conducting medium circulation mechanism, which is connected to each hollow temperature-controlled roller and supplies a constant-temperature heat-conducting medium to maintain the surface temperature of the hollow temperature-controlled roller at 0°C to 4°C.

[0007] Furthermore, the tensioning unit includes a fixed housing, a servo drive assembly, a double-threaded screw, two mounting brackets, and two tensioning wheels. The servo drive assembly is fixedly connected inside the fixed housing. The double-threaded screw is connected to the output end of the servo drive assembly. The double-threaded screw has two sections of threads with opposite directions of rotation. The two mounting brackets are respectively engaged with the two sections of threads of the double-threaded screw. The two tensioning wheels are respectively rotatably connected to the sides of the two mounting brackets and symmetrically distributed on both sides of the chain. A first linear slide rail is provided inside the fixed housing, and the mounting brackets are slidably connected to the first linear slide rail.

[0008] Furthermore, the lifting unit includes a first connecting frame, a first wedge block, a second wedge block, and a second connecting frame. The first connecting frame is fixedly connected to the mounting frame, the first wedge block is fixedly connected to the upper end of the first connecting frame, the first wedge block and the second wedge block slide in cooperation through the wedge surface, the bottom of the second wedge block is fixedly connected to the second connecting frame, and the bottom of the second connecting frame is rotatably connected to the end of the soft tooth feeding roller.

[0009] Furthermore, the lifting unit also includes a second linear slide rail and an elastic telescopic component. The second linear slide rail is installed on the upper part of the fixed housing, and the first wedge block is slidably connected to the second linear slide rail. One end of the elastic telescopic component is fixedly connected to the inner top wall of the fixed housing, and the other end is fixedly connected to the upper part of the second connecting frame. A guide rail is fixedly connected to the upper surface of the second wedge block, and the first wedge block is slidably connected to the guide rail. The cross-section of the guide rail is cross-shaped.

[0010] Furthermore, the heat transfer medium circulation mechanism includes a constant temperature circulation machine body, a circulation outlet pipe, a circulation inlet pipe, a distributor, a collector, and a rotary joint. The outlet end of the constant temperature circulation machine body is equipped with a circulation outlet pipe, and the end of the circulation outlet pipe is equipped with a distributor. The distributor is connected to the rotary joint at the inlet end of each hollow temperature-controlled roller through various branch pipes. The inlet end of the constant temperature circulation machine body is equipped with a circulation inlet pipe, and the end of the circulation inlet pipe is equipped with a collector. The collector is connected to the rotary joint at the outlet end of each hollow temperature-controlled roller through various branch pipes. The rotary joints are respectively installed at both ends of each hollow temperature-controlled roller.

[0011] Furthermore, the hollow temperature-controlled roller includes a cylinder, a central tube, a spiral guide plate, and two medium guide heads. The central tube is coaxially installed inside the cylinder. The spiral guide plate is fixedly connected to the outer wall of the central tube and extends spirally along the axial direction. The spiral guide plate is located in the annular cavity between the central tube and the cylinder. The two medium guide heads are respectively fixedly connected to both ends of the central tube. The medium guide heads are connected to the rotary joints at the corresponding ends. The heat-conducting medium enters the annular cavity from one end of the medium guide head, is guided by the spiral guide plate to flow along the spiral path to the other end, and flows out from the other end of the medium guide head.

[0012] Furthermore, the outer surface of the cylinder is coated with an elastic coating, and the surface of the elastic coating is provided with an array of micro-pits.

[0013] Furthermore, a flow divider plate is fixedly connected to the end of the medium guide head, and multiple flow divider holes are provided on the side wall of the medium guide head. After being guided by the flow divider plate, the heat-conducting medium enters the annular cavity evenly through the flow divider holes.

[0014] The beneficial effects of this invention are: This invention utilizes a soft-toothed feeding roller positioned above the feed end of the roller assembly. The food-grade silicone rubber soft teeth rotate slowly in the same direction, gently separating and flattening the stacked coconut meat into a single layer. The elastic deformation of the soft teeth absorbs contact impact, and the rounded, arc-shaped teeth push without piercing, preventing damage to the tender and crisp coconut meat. This reduces uneven freezing and clumping issues caused by stacking. The adjustment mechanism employs a linkage design between the lifting and tensioning units, synchronously driven by the same servo power source. While adjusting the height of the soft-toothed feeding roller, it compensates for changes in chain length in real time, ensuring the chain maintains constant tension and preventing tooth skipping or loosening. The structure is compact, with high adjustment precision, and can adapt to the flattening requirements of coconut meat of different sizes.

[0015] A constant-temperature heat-conducting medium is supplied to the hollow temperature-controlled drum through a heat-conducting medium circulation mechanism, maintaining the drum surface temperature stably between 0°C and +4°C, above the freezing point. This fundamentally eliminates the low-temperature freezing and sticking phenomenon between the coconut meat and the drum, preventing the coconut meat from sticking and peeling off, thus preventing damage. The drum surface temperature is above the frost point, preventing sublimation and frost formation, allowing the device to operate continuously for extended periods without shutdown for defrosting. The food-grade silicone rubber elastic coating and micro-dimple array on the drum surface provide dual anti-sticking redundancy protection, effectively preventing sticking even with occasional fluctuations in the temperature control system. The intelligent control system achieves PID closed-loop control of the drum surface temperature, speed regulation linked to the outlet coconut meat center temperature, and real-time monitoring and alarm of multiple parameters, ensuring stable and efficient operation. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof.

[0017] In the attached diagram: Figure 1 This is a schematic diagram of the overall three-dimensional structure of the roller-type food conveying device proposed in this invention; Figure 2 This is a schematic diagram of the internal three-dimensional structure of the cover in the roller-type food conveying device proposed in this invention. Figure 3 This is a schematic diagram of the internal three-dimensional structure of the fixed shell in the roller-type food conveying device proposed in this invention; Figure 4 This is a three-dimensional structural diagram of the transmission mechanism in the roller-type food conveying device proposed in this invention; Figure 5 This is a three-dimensional structural diagram of the tensioning unit in the roller-type food conveying device proposed in this invention; Figure 6 This is a side view of the lifting unit in the roller-type food conveying device proposed in this invention. Figure 7 This is a schematic diagram of the overall three-dimensional structure of the heat transfer medium circulation mechanism in the roller-type food conveying device proposed in this invention. Figure 8 This is a top view of the hollow temperature control roller in the roller-type food conveying device proposed in this invention. Figure 9 This is a schematic diagram of the internal three-dimensional structure of the drum body in the roller-type food conveying device proposed in this invention. Figure 10 This is a three-dimensional structural diagram of the medium guide head in the roller-type food conveying device proposed in this invention.

[0018] In the diagram: 1. Main body of the roller conveyor; 11. Hollow temperature-controlled roller; 111. Cylinder body; 112. Elastic coating; 113. Central tube; 114. Spiral guide plate; 115. Medium guide head; 116. Diverter plate; 117. Diverter hole; 2. Cover; 3. Soft-tooth feeding roller; 4. Adjustment mechanism; 41. Fixed housing; 42. Servo drive assembly; 43. Double threaded screw; 44. Mounting bracket; 45. Tensioner wheel; 46. First linear guide rail; 4 7. First connecting frame; 48. Second linear slide rail; 49. First wedge block; 410. Second wedge block; 411. Guide rail; 412. Second connecting frame; 413. Elastic telescopic component; 5. Heat transfer medium circulation mechanism; 51. Main body of constant temperature circulation machine; 52. Circulation outlet pipe; 53. Circulation inlet pipe; 54. Distributor; 55. Collector; 56. Rotary joint; 6. Transmission mechanism; 61. First sprocket; 62. Chain; 63. Second sprocket. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.

[0020] refer to Figures 1 to 10 This device is applied in a coconut meat liquid nitrogen quick-freezing production line, set inside the quick-freezing tunnel, for feeding, turning, and leveling tender and crisp coconut meat after manual shelling and meat removal, and for continuous anti-sticking conveying under extreme low temperature conditions. It includes a roller conveyor body 1, with a cover 2 installed on the upper part of the roller conveyor body 1. The cover 2 is the heat insulation cover of the liquid nitrogen quick-freezing tunnel, which is conventional prior art in this field, and this invention does not make any special improvements to its structure. The roller conveyor body 1 includes a roller group composed of multiple parallel hollow temperature-controlled rollers 11. A soft-toothed feeding roller 3 is provided above the feeding end of the roller group. The soft-toothed feeding roller 3 is linked to the roller group through a transmission mechanism 6. An adjustment mechanism 4 is provided at the end of the soft-toothed feeding roller 3. The adjustment mechanism 4 includes a linked lifting unit and a tensioning unit. The device also includes a heat-conducting medium circulation mechanism 5, which is connected to each hollow temperature-controlled roller 11 and supplies a constant temperature heat-conducting medium to maintain the surface temperature of the hollow temperature-controlled roller 11 between 0°C and 4°C.

[0021] In this implementation scheme, the coconut meat, after being manually shelled and removed, falls into the feed end of the roller assembly through the feed inlet. The drive motor of the main body 1 of the roller conveyor drives the hollow temperature-controlled roller 11 to rotate, realizing the continuous conveying of coconut meat. The transmission mechanism 6 transmits the power of the first hollow temperature-controlled roller 11 to the soft-tooth feeding roller 3, so that the soft-tooth feeding roller 3 rotates in the same direction as the roller, gently separating and flattening the coconut meat stacked at the feed end into a single layer. The adjustment mechanism 4 can adjust the height of the soft-tooth feeding roller 3 according to the specifications of the coconut meat, and simultaneously tensions the transmission chain 62 during height adjustment to ensure smooth transmission. The heat transfer medium circulation mechanism 5 supplies a constant temperature heat transfer medium into each hollow temperature-controlled roller 11, so that the surface temperature of the roller is maintained above the freezing point, fundamentally eliminating the low-temperature freezing and sticking phenomenon between the coconut meat and the roller, and at the same time preventing frost from forming on the roller surface.

[0022] refer to Figure 2 , Figure 3 , Figure 8 , Figure 9 and Figure 10 The hollow temperature-controlled roller 11 includes a cylinder 111, a central tube 113, a spiral guide plate 114, and two media guide heads 115. The cylinder 111 is made of food-grade 304 stainless steel. The outer surface of the cylinder 111 is coated with an elastic coating 112, which is food-grade silicone rubber with a Shore hardness of A30 to A50. A food-grade silicone rubber undercoat is provided between the elastic coating 112 and the cylinder 111 to enhance adhesion. The surface of the elastic coating 112 is provided with a micro-pit array, which is formed by hot pressing with a mold. The pit depth is 50-200μm, and the pit accounts for 40%-60% of the surface area. The micro-pits are used to trap air to form an air cushion, reducing the actual contact area between the coconut meat and the roller surface. Combined with the low surface energy characteristics of silicone rubber, it achieves double anti-sticking.

[0023] The central tube 113 is coaxially mounted inside the cylinder 111. The central tube 113 is a hollow support tube closed at both ends, serving only to support the medium guide head 115 and the spiral guide plate 114. The heat transfer medium does not enter the interior of the central tube 113. The spiral guide plate 114 is fixedly connected to the outer wall of the central tube 113 and extends spirally along the axial direction. The spiral guide plate 114 is located within the annular cavity between the central tube 113 and the cylinder 111. The spiral guide plate 114 is made of stainless steel and is welded to the outer wall of the central tube 113 by continuous argon arc welding. The outer edge of the spiral guide plate 114 is flush with the cylinder. A 0.1-0.3mm assembly gap is left between the inner walls of 111 (or a PTFE elastic sealing strip is embedded to press against the inner wall of the cylinder) to reduce medium short circuit; two medium guide heads 115 are fixedly connected to the two ends of the central tube 113 respectively, and the medium guide head 115 is connected to the rotary joint 56 at the corresponding end. The heat transfer medium enters the annular cavity from the medium guide head 115 at one end, is guided by the spiral guide plate 114 to flow along the spiral path against the wall, and fully exchanges heat with the inner wall of the cylinder 111 to make the surface temperature of the cylinder 111 uniform, and then flows out from the medium guide head 115 at the other end.

[0024] refer to Figure 9 and Figure 10 The end of the medium guide head 115 is fixedly connected to a flow divider plate 116, and the side wall of the medium guide head 115 is provided with multiple flow divider holes 117. After the heat transfer medium enters the interior of the medium guide head 115 through the rotary joint 56, it is first guided by the flow divider plate 116, and then evenly enters the annular cavity between the central tube 113 and the cylinder 111 through the flow divider holes 117 on the side wall, so as to avoid local flow deviation of the medium and ensure that the medium in the annular cavity is evenly distributed along the circumference and axial direction.

[0025] refer to Figure 2 , Figure 3 and Figure 4The soft-tooth feeding roller 3 is arranged parallel to the feed end of the roller assembly above the roller group. It includes a roller body and food-grade silicone rubber soft teeth on the surface of the roller body. The roller body is a solid shaft made of food-grade 304 stainless steel, and the surface of the roller body is coated with a food-grade silicone rubber anti-stick coating. The soft teeth are round-headed and arc-shaped, with a root width of 10-15mm, a tip width of 5-8mm, a height of 15-25mm, and a rounded corner of R3-R5mm at the tooth end. The soft teeth are spirally arranged along the axial direction of the roller body, with a lead of 100-200mm and a Shore hardness of A30 to A40. The soft-tooth feeding roller 3 is linked to the roller assembly through a transmission mechanism 6. Structure 6 includes a first sprocket 61, a chain 62, and a second sprocket 63. The first sprocket 61 is fixed to the shaft end of the first hollow temperature-controlled roller 11 at the feeding end, and the second sprocket 63 is fixed to the shaft end of the soft-tooth feeding roller 3. The chain 62 meshes with the first sprocket 61 and the second sprocket 63 respectively, so that the soft-tooth feeding roller 3 and the hollow temperature-controlled roller 11 rotate in the same direction. Through the design of the tooth ratio of the first sprocket 61 and the second sprocket 63, the rotation speed of the soft-tooth feeding roller 3 is 1 / 2 to 1 / 3 of the roller rotation speed, so as to achieve slow rotation in the same direction. The soft teeth only play a light scraping role, without throwing the material or damaging the tender and crisp coconut meat.

[0026] refer to Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 The adjustment mechanism 4 is located at both ends of the soft tooth feed roller 3, including a lifting unit and a tensioning unit. The lifting unit is used to adjust the height of the soft tooth feed roller 3, and the tensioning unit is used to adjust the tension of the chain 62 synchronously when the height of the soft tooth feed roller 3 is adjusted. Both are driven by the same power source to achieve synchronous linkage between height adjustment and chain tensioning.

[0027] Specifically, the tensioning unit includes a fixed housing 41, a servo drive assembly 42, a double-threaded screw 43, two mounting brackets 44, and two tensioning wheels 45. The servo drive assembly 42 is fixedly connected inside the fixed housing 41 and includes a servo motor and a reduction mechanism, outputting rotary motion. The double-threaded screw 43 is connected to the output end of the servo drive assembly 42. The double-threaded screw 43 has two sections of threads with opposite directions of rotation. The pitch of the two sections of threads is equal and the directions of rotation are opposite. The two mounting brackets 44 are respectively engaged with the two sections of threads of the double-threaded screw 43 through screw nuts. The two tensioning wheels 45 are respectively... The two mounting brackets 44 are rotatably connected to the sides of the chain 62 and symmetrically distributed on both sides. The fixed housing 41 is provided with a first linear slide rail 46. The mounting brackets 44 are slidably connected to the first linear slide rail 46 through a slider. The first linear slide rail 46 guides and limits the horizontal movement of the mounting brackets 44. When the servo drive assembly 42 drives the double threaded screw 43 to rotate, the two threads with opposite directions drive the two mounting brackets 44 to move synchronously relative to each other or towards each other along the first linear slide rail 46, thereby driving the two tensioning wheels 45 to squeeze inward or loosen outward from both sides to realize real-time adjustment of the chain tension.

[0028] Furthermore, the lifting unit includes a first connecting frame 47, a first wedge block 49, a second wedge block 410, and a second connecting frame 412; the first connecting frame 47 is fixedly connected to the upper part of the mounting frame 44, the first wedge block 49 is fixedly connected to the upper end of the first connecting frame 47, the lower surface of the first wedge block 49 is a wedge-shaped inclined surface, and the upper surface of the second wedge block 410 is a wedge-shaped inclined surface that mates with the first wedge block 49; the first wedge block 49 and the second wedge block 410 slide in contact through the wedge-shaped surfaces; the bottom of the second wedge block 410 is fixedly connected to the second connecting frame 412. The bottom of the second connecting frame 412 is rotatably connected to the end of the soft tooth feeding roller 3 via a bearing, so that the soft tooth feeding roller 3 can rotate freely while the second connecting frame 412 is raised and lowered. When the mounting frame 44 moves horizontally under the drive of the double threaded screw 43, the first wedge block 49 is moved horizontally synchronously through the first connecting frame 47. The wedge surface of the first wedge block 49 slides relative to the wedge surface of the second wedge block 410, converting the horizontal movement into the vertical movement of the second wedge block 410. Then, the soft tooth feeding roller 3 is raised and lowered through the second connecting frame 412 to achieve height adjustment.

[0029] The lifting unit also includes a second linear slide rail 48 and an elastic telescopic component 413. The second linear slide rail 48 is installed on the upper part of the fixed housing 41. The first wedge block 49 is slidably connected to the second linear slide rail 48 through a slider. The second linear slide rail 48 guides and limits the horizontal movement of the first wedge block 49. One end of the elastic telescopic component 413 is fixedly connected to the inner top wall of the fixed housing 41, and the other end is fixedly connected to the upper part of the second connecting frame 412. The elastic telescopic component 413 is a gas spring or tension spring, which provides a reset force for the rise of the soft tooth feeding roller 3 and buffers the impact load during the lifting process. A guide rail 411 is fixedly connected to the wedge surface of the second wedge block 410. The first wedge block 49 is slidably connected to the guide rail 411 through a slider. The cross section of the guide rail 411 is cross-shaped. The cross-shaped structure accurately guides the relative sliding between the first wedge block 49 and the second wedge block 410, preventing lateral swaying or disengagement when the wedge surfaces are engaged.

[0030] refer to Figure 1 , Figure 7 and Figure 8The heat transfer medium circulation mechanism 5 includes a constant temperature circulation machine body 51, a circulation outlet pipe 52, a circulation inlet pipe 53, a distributor 54, a collector 55, and a rotary joint 56. The constant temperature circulation machine body 51 is an industrial constant temperature circulation device with both cooling and heating functions. It adopts a compressor cooling, electric heating, or heat pump bidirectional temperature regulation method, which can accurately control the temperature of the heat transfer medium at the set value. Its cooling capacity and heating capacity are automatically adjusted according to the real-time feedback of the drum surface temperature, and the temperature control accuracy can reach ±0.5°C. The outlet end of the constant temperature circulation machine body 51 is equipped with a circulation outlet pipe 52, and the end of the circulation outlet pipe 52 is equipped with a distributor 54. The distributor 54 has branch interfaces evenly opened along the axial direction on its side, with the same number of branches as the drums. The distributor 54 is connected to the inlet end of each hollow temperature-controlled drum 11 through each branch pipe. The adapter 56 connects to the distributor 54, which buffers and homogenizes the constant temperature heat transfer medium output from the constant temperature circulation machine body 51 within the cavity, and then evenly distributes it to each hollow temperature control roller 11. A circulation inlet pipe 53 is installed at the inlet end of the constant temperature circulation machine body 51, and a collector 55 is installed at the end of the circulation inlet pipe 53. The structure of the collector 55 is the same as that of the distributor 54. The collector 55 is connected to the rotary joint 56 at the outlet end of each hollow temperature control roller 11 through each branch pipe. The collector 55 collects the heat transfer medium returning from each hollow temperature control roller 11 and sends it back to the constant temperature circulation machine body 51. Each hollow temperature control roller 11 is equipped with a manual regulating valve and a flow meter on the medium inlet branch. During installation and commissioning, the opening of each branch valve is adjusted one by one to make the flow rate of all rollers consistent. During operation, the flow meter monitors the flow rate of each roller in real time. Rotary joints 56 are installed at both ends of each hollow temperature control roller 11. The rotary joint 56 is a low-temperature single-channel rotary joint, including a housing, a rotating shaft and food-grade perfluoroether rubber (FFKM) seals, to realize the continuous supply and return of heat transfer medium while the roller is rotating. The low-temperature resistance of the seals is not lower than -40°C.

[0031] This device also includes an intelligent control system, which comprises a control unit, a temperature detection unit, a flow detection unit, a pressure detection unit, a speed detection unit, and an execution unit. The control unit employs a programmable logic controller (PLC). The signal output terminals of each detection unit are connected to the signal input terminals of the control unit, and the control signal output terminals of the control unit are connected to the execution unit, achieving intelligent monitoring and closed-loop control throughout the entire process. The intelligent control system is a preferred embodiment of this invention, used to further improve the automation level and operational stability of the device, and is not a necessary technical feature for achieving the basic objectives of this invention.

[0032] The temperature detection unit includes a PT100 temperature sensor (two redundantly configured) installed on the circulating liquid outlet pipe 52, a non-contact infrared thermometer installed above the rollers (one for every six rollers, detection distance 100-200mm, temperature range -50°C to +100°C), and an infrared thermometer for the surface temperature of the coconut meat installed at the outlet of the conveying device. The PT100 temperature sensor detects the supply temperature of the heat transfer medium in real time, the infrared thermometer detects the surface temperature of each section of the rollers in real time, and the outlet infrared thermometer detects the surface temperature of the discharged coconut meat in real time. The control unit determines whether the core temperature meets the standard based on the surface temperature of the coconut meat, the specifications of the coconut meat, and the freezing time.

[0033] The flow detection unit includes a flow meter installed on the medium inlet branch of each hollow temperature-controlled roller 11. The flow meter is a turbine flow meter or an electromagnetic flow meter with a range of 0-10L / min and an accuracy of ±1%. It monitors the medium flow of each roller in real time to ensure uniform medium distribution in each roller and detects pipeline blockage or leakage faults in a timely manner.

[0034] The pressure detection unit includes a differential pressure sensor (range -100Pa to +100Pa, accuracy ±1Pa) installed in the quick-freezing tunnel and a pressure sensor (range 0-500Pa) installed on the nitrogen supply pipeline in the bearing cavity. The differential pressure sensor detects the pressure difference between the tunnel and the outside in real time, and the nitrogen pressure sensor detects the positive pressure value of nitrogen in the bearing cavity in real time.

[0035] The rotational speed detection unit includes an encoder (1000 lines / revolution resolution) mounted on the output shaft of the roller drive motor to detect the rotational speed and linear velocity of the roller in real time.

[0036] The execution unit includes a refrigeration / heating three-way regulating valve for the constant temperature circulating machine body 51, a frequency converter for the heat transfer medium circulation pump, a frequency converter for the roller drive motor, a frequency converter for the soft tooth feeding roller 3 drive motor, a tunnel nitrogen replenishment solenoid valve, and various audible and visual alarm devices.

[0037] The core control logic of the control unit includes: Drum surface temperature closed-loop control: An infrared thermometer detects the drum surface temperature in real time. The control unit adjusts the opening of the 51 three-way regulating valve of the constant temperature circulation machine body through a PID algorithm, thereby adjusting the cooling / heating ratio to stabilize the liquid supply temperature at the set value, thus stabilizing the drum surface temperature within the range of 0°C to 4°C. When the drum surface temperature is higher than 4°C, the cooling ratio is increased to decrease the liquid supply temperature; when the drum surface temperature is lower than 0°C, the heating ratio is increased to increase the liquid supply temperature. The PID parameters are determined based on on-site debugging, with the proportional band set to 5-10°C, the integral time set to 30-60s, and the derivative time set to 5-10s. The temperature control accuracy can reach ±0.5°C.

[0038] Outlet coconut meat center temperature linkage speed control: The outlet infrared thermometer detects the surface temperature of the discharged coconut meat in real time. The control unit comprehensively judges the center temperature of the coconut meat based on the surface temperature, coconut meat specifications, and drum speed (i.e., freezing time). Based on the judgment result, the speed of the drum drive motor is adjusted by frequency conversion to achieve intelligent coordination between conveying speed and freezing process. When the coconut meat center temperature is judged to be higher than -38°C (insufficient freezing), the drum speed is reduced to prolong the freezing time of the coconut meat in the tunnel. When the coconut meat center temperature is judged to be lower than -45°C (overfreezing), the drum speed is increased to shorten the freezing time to save energy. The adjustment range of the drum linear speed is 0.1m / min to 0.5m / min, and the speed adjustment adopts a gradual method (acceleration not exceeding 0.01m / min²) to avoid sudden speed change causing coconut meat displacement or stacking.

[0039] Media flow monitoring and alarm: Each flow meter detects the media flow of each roller in real time. The control unit compares the real-time flow with the set flow (preferably 3L / min). When the flow deviation of a roller exceeds ±10%, the control unit issues an audible and visual alarm, prompting the operator to check whether the pipeline of the corresponding roller is blocked or leaking. At the same time, the control unit records the cumulative flow and running time of each roller for equipment maintenance and fault tracing.

[0040] Closed-loop control of cabin pressure: Differential pressure sensors detect the pressure inside the tunnel in real time. The control unit maintains a slight positive pressure (+10Pa to +50Pa) inside the tunnel by adjusting the opening of the nitrogen replenishment solenoid valve to prevent the intrusion of hot air from causing frost and loss of cooling capacity. When the pressure inside the tunnel is lower than +10Pa, the nitrogen replenishment solenoid valve is opened to increase the nitrogen supply. When the pressure is higher than +50Pa, the solenoid valve is closed to reduce the nitrogen supply.

[0041] Nitrogen pressure monitoring in bearing cavity: The nitrogen pressure sensor detects the nitrogen pressure in the bearing cavity in real time, and normally maintains it between 50Pa and 100Pa; when the pressure is lower than 50Pa, the control unit issues an alarm to prompt the nitrogen supply to be checked, so as to prevent the cold and wet gas from entering the bearing cavity and causing frost and lubrication failure; when the pressure is higher than 100Pa, the nitrogen supply valve is closed to avoid nitrogen waste.

[0042] Intelligent height adjustment of the soft-tooth feeding roller 3: An infrared ranging sensor is set above the feeding end to detect the average stacking thickness of the fed coconut meat in real time. The control unit automatically calculates the optimal height of the soft-tooth feeding roller 3 based on the average thickness (the optimal gap is 1.2-1.5 times the average thickness of the coconut meat) and drives the servo drive component 42 to automatically adjust, so as to achieve adaptive optimization of the paving effect. When the average thickness of the fed coconut meat increases, the soft-tooth feeding roller 3 is automatically raised; when the thickness decreases, it is automatically lowered to ensure the paving effect of a single layer.

[0043] Example 1: When the coconut meat liquid nitrogen quick-freezing production line is started, the heat transfer medium circulation mechanism 5 is turned on first. The constant temperature circulation machine body 51 cools the food-grade dimethyl silicone oil to 0°C and delivers it to the distributor 54 through the circulation outlet pipe 52. The distributor 54 evenly distributes the medium to each branch and enters the interior of each hollow temperature-controlled roller 11 through the rotary joint 56 at the inlet end. After the medium enters the medium guide head 115, it is guided by the flow divider plate 116 and evenly enters the annular cavity through the flow divider hole 117 on the side wall. The spiral guide plate 114 forces the medium to flow along the spiral path and adhere to the wall, fully exchanging heat with the inner wall of the cylinder 111, so that the surface temperature of the cylinder 111 is uniformly maintained at about 0°C. After heat exchange, the medium flows out from the medium guide head 115 at the other end through the rotary joint 56 at the outlet end, flows into the collector 55, and flows back to the constant temperature circulation machine body 51 through the circulation inlet pipe 53 to complete the circulation.

[0044] After the surface temperature of all hollow temperature-controlled rollers 11 stabilizes between 0°C and 4°C, the drive motor of the roller conveyor body 1 is started, and the hollow temperature-controlled rollers 11 begin to rotate. The room-temperature coconut meat, after being manually shelled and minced, falls into the feed end of the roller group through the feed inlet. The first hollow temperature-controlled roller 11 at the feed end drives the first sprocket 61 to rotate. The first sprocket 61 drives the second sprocket 63 to rotate synchronously through the chain 62. The second sprocket 63 drives the soft-tooth feeding roller 3 to rotate slowly in the same direction as the roller. The silicone rubber soft teeth on the surface of the soft-tooth feeding roller 3 gently separate and flatten the stacked coconut meat into a single layer.

[0045] When the height of the soft-tooth feeding roller 3 needs to be adjusted according to the specifications of the coconut meat, the servo drive assembly 42 drives the double-threaded screw 43 to rotate. The two threads with opposite directions drive the two mounting brackets 44 to move synchronously relative to each other (when lowering the height) or towards each other (when raising the height) along the first linear slide rail 46. Taking the lowering of the height as an example, the relative movement of the two mounting brackets 44 drives the two tensioning wheels 45 to squeeze the chain 62 from both sides inward, compensating for the slack in the chain caused by the descent of the soft-tooth feeding roller 3, so that the chain 62 always maintains a suitable tension. On the other hand, the first connecting frame 47 drives the two first wedge blocks 49 to move horizontally relative to each other. The first wedge blocks 49 move horizontally along the second linear slide rail 48, and their wedge surfaces move along a cross shape. The guide rail 411 presses down on the wedge-shaped surface of the second wedge block 410, causing the second wedge block 410 to move downward. The second wedge block 410 drives the soft tooth feed roller 3 to descend through the second connecting frame 412. At this time, the elastic telescopic component 413 is stretched. When it is necessary to increase the height, the servo drive component 42 rotates in the opposite direction, the two mounting frames 44 move towards each other, the tension wheel 45 loosens the chain 62 outward, the first wedge block 49 releases the pressure on the second wedge block 410, and the elastic telescopic component 413 retracts, driving the second connecting frame 412 and the soft tooth feed roller 3 to rise, thus completing the height adjustment. This achieves the linkage effect of one power source simultaneously driving height adjustment and chain 62 tensioning, with a compact structure, high adjustment accuracy, and smooth and reliable transmission.

[0046] The flattened single layer of coconut meat moves forward with the drum into the strong cold zone of the quick-freezing tunnel, where liquid nitrogen sprays for rapid freezing, and the surface of the coconut meat forms a crust within minutes. Because the surface temperature of the hollow temperature-controlled drum 11 is maintained between 0°C and 4°C, which is above the freezing point, the free water and sugar on the surface of the coconut meat will not freeze after contacting the drum, fundamentally eliminating the low-temperature freezing and sticking (ice welding) phenomenon. The coconut meat will not stick to the drum surface and be forcibly peeled off, causing damage. At the same time, the surface temperature of the drum is above the frost point, so the supercooled nitrogen in the tunnel and the water vapor generated by the sublimation of the coconut meat will not condense and frost on the drum surface, achieving continuous operation without stopping for defrosting. The food-grade silicone rubber elastic coating 112 on the surface of the drum 111 provides elastic cushioning to prevent the coconut meat from being squeezed and damaged by hard contact. The micro-dimpled array on the surface traps air to form an air cushion, further reducing the actual contact area between the coconut meat and the drum. Combined with the low surface energy characteristics of silicone rubber, it achieves double anti-sticking redundancy protection.

[0047] After the coconut meat enters the temperature equalization zone, the internal temperature continues to drop, and the final core temperature drops below -38°C. It is then discharged from the discharge end, with each piece intact, without surface damage or sticking, and directly enters the packaging process.

[0048] Throughout the entire operation of the device, the intelligent control system monitors various operating parameters in real time and performs closed-loop regulation: the infrared thermometer above the drum continuously detects the surface temperature of the drum, and adjusts the cooling and heating ratio of the constant temperature circulation machine body 51 through the PID algorithm to keep the surface temperature of the drum stable between 0°C and 4°C; the outlet infrared thermometer continuously detects the surface temperature of the discharged coconut meat, and the control unit judges the core temperature based on the coconut meat specifications and freezing time. When the core temperature is judged to be higher than -38°C, the drum speed is automatically reduced to extend the freezing time, and when the temperature is lower than -45°C, the speed is automatically increased to save energy; the flow meter at the inlet of each drum continuously monitors the medium flow rate, and promptly sounds and lights an alarm when the flow rate deviation of a certain drum exceeds ±10%; the differential pressure sensor in the tunnel maintains a slight positive pressure of +10~+50Pa in the tunnel, and the nitrogen pressure sensor in the bearing cavity maintains a positive nitrogen pressure of 50~100Pa in the bearing cavity to prevent the intrusion of external air and the leakage of cold energy; the infrared ranging sensor at the feeding end can also automatically adjust the height of the soft tooth feeding roller 3 according to the thickness of the coconut meat stack, so as to achieve adaptive optimization of the leveling effect. Through the above-mentioned multi-parameter collaborative closed-loop control, the device can achieve long-term stable, intelligent and efficient operation under extreme low temperature conditions.

[0049] Working principle: At the start of operation, the heat transfer medium circulation mechanism 5 is activated first. The temperature-controlled circulation machine body 51 adjusts the temperature of the food-grade dimethyl silicone oil to 0°C. The medium enters the distributor 54 through the circulation outlet pipe 52. After being buffered and homogenized by static pressure in the distributor 54, it is evenly distributed to the interior of each hollow temperature-controlled roller 11 through each branch pipeline and the rotary joint 56 at the inlet end. After the medium enters the medium guide head 115, it is first guided by the diversion plate 116 and then through the diversion holes on the side wall. 117 The medium enters evenly into the annular cavity between the central tube 113 and the cylinder 111. The spiral guide plate 114 forces the medium to flow along the spiral path and adhere to the wall, fully exchanging heat with the inner wall of the cylinder 111, so that the surface temperature of all hollow temperature control rollers 11 is uniformly maintained between 0°C and 4°C. After heat exchange, the medium flows out from the medium guide head 115 at the other end through the liquid outlet rotary joint 56, flows into the liquid collector 55, and flows back to the constant temperature circulation machine body 51 through the circulation inlet pipe 53, completing the closed circulation.

[0050] After the surface temperature of the roller stabilizes, the roller drive motor is started, and the hollow temperature-controlled roller 11 begins to rotate. The first roller at the feeding end drives the soft-tooth feeding roller 3 to rotate slowly in the same direction through the transmission mechanism 6 composed of the first sprocket 61, chain 62, and second sprocket 63. The soft-tooth feeding roller 3 rotates in the same direction as the hollow temperature-controlled roller 11. At the contact point between the two, the tangential movement direction of the lower surface of the soft-tooth feeding roller 3 is opposite to the conveying direction of the upper surface of the roller, that is, the soft teeth comb backward (against the conveying direction). Manual removal After the coconut meat is removed from the shell, it falls onto the feed roller at the feed end through the feed inlet. When the stacked coconut meat encounters the soft toothed feeding roller 3, the spirally arranged silicone rubber soft teeth gently contact the upper layer of coconut meat one by one. The elastic deformation of the soft teeth absorbs the contact impact, and the round-headed arc-shaped teeth only push and do not pierce, gently pulling the upper layer of coconut meat backward (against the conveying direction) and letting it fall onto the rear roller. It is longitudinally staggered from the lower layer of coconut meat conveyed forward. The coconut meat that is higher than the gap is pulled apart and flattened. Only a single layer of coconut meat that does not exceed the height of the gap can pass through, realizing automatic turning and flattening at the feed end.

[0051] When the coconut meat specifications change and the height of the soft-tooth feeding roller 3 needs to be adjusted, the servo drive assembly 42 drives the double-threaded screw 43 to rotate. The two threads with opposite directions drive the two mounting brackets 44 to move synchronously relative to each other or towards each other along the first linear slide rail 46. When the mounting brackets 44 move, on the one hand, they drive the tensioning wheel 45 to squeeze or loosen the chain 62 from both sides, compensating in real time for changes in the tension of the chain 62 caused by the rise and fall of the soft-tooth feeding roller 3, so that the chain 62 always maintains a constant tension and avoids the chain 62 from skipping teeth or loosening and falling off; on the other hand, through The first connecting frame 47 drives the first wedge block 49 to move horizontally synchronously along the second linear slide rail 48. The first wedge block 49 and the second wedge block 410 slide and engage through the wedge surface guided by the cross-shaped guide rail 411, converting the horizontal movement into the vertical movement of the second wedge block 410. The second wedge block 410 drives the soft tooth feeding roller 3 to rise and fall through the second connecting frame 412. The elastic telescopic component 413 provides the rising and resetting elastic force and buffers the impact. Thus, a single power source simultaneously drives the linkage effect of height adjustment and chain 62 tension.

[0052] The flattened single layer of coconut meat passes sequentially through the pre-cooling zone, the strong cooling zone, and the uniform temperature zone with the roller. In the strong cooling zone, it is rapidly frozen by liquid nitrogen spray. Since the surface temperature of the hollow temperature-controlled roller 11 is always maintained above the freezing point, the free water and sugar on the surface of the coconut meat will not freeze after contacting the roller, completely eliminating the low-temperature freezing and sticking phenomenon. The coconut meat moves forward smoothly with the roller without being stuck or peeled off. The surface temperature of the roller is higher than the frost point, so there will be no sublimation or frost formation. The device can run continuously for a long time without stopping for defrosting. The silicone rubber elastic coating 112 on the surface of the cylinder 111 provides elastic cushioning to prevent the coconut meat from being squeezed and damaged by hard contact. The micro-dimpled array on the surface traps air to form an air cushion, further reducing the actual contact area between the coconut meat and the roller. Combined with the low surface energy characteristics of silicone rubber, it achieves double anti-sticking redundancy protection.

[0053] Throughout the entire operation of the device, the intelligent control system monitors and adjusts various operating parameters in real time and in a closed loop: an infrared thermometer detects the surface temperature of the drum, and the PID algorithm adjusts the cooling and heating ratio of the main body 51 of the constant temperature circulation machine, with a temperature control accuracy of ±0.5°C; an outlet infrared thermometer detects the surface temperature of the coconut meat, and the control unit, combined with specifications and freezing time, determines the center temperature and links the frequency converter to adjust the drum speed, ranging from 0.1 to 0.5 m / min, with gradual adjustment to avoid material displacement; flow meters on each drum monitor the medium flow rate, and an alarm is triggered if the deviation exceeds ±10%; a differential pressure sensor maintains a slight positive pressure in the tunnel of +10 to +50 Pa, and a nitrogen pressure sensor maintains a positive pressure in the bearing cavity of 50 to 100 Pa; an optional infrared ranging sensor automatically adjusts the height of the soft-tooth feeding roller 3 according to the thickness of the coconut meat stack. Through multi-parameter collaborative closed-loop control, the device achieves long-term stable, intelligent, and efficient operation under extreme low-temperature conditions.

[0054] Finally, the coconut meat undergoes internal temperature homogenization in the uniform temperature zone, with the center temperature dropping below -38°C. It is then discharged intact as a single piece from the discharge end, without damage, adhesion, or impurities, and directly enters the subsequent packaging process, achieving continuous and stable transportation of coconut meat under extreme low-temperature conditions.

[0055] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A roller-type food conveying device, comprising a roller conveyor body (1), wherein a cover (2) is installed on the upper part of the roller conveyor body (1), and the roller conveyor body (1) comprises a roller assembly composed of multiple parallel hollow temperature-controlled rollers (11), characterized in that: A soft-tooth feeding roller (3) is provided above the feed end of the roller assembly; the soft-tooth feeding roller (3) is linked with the roller assembly through a transmission mechanism (6). The transmission mechanism (6) includes a first sprocket (61), a chain (62), and a second sprocket (63). The first sprocket (61) is fixed to the shaft end of the first hollow temperature-controlled roller (11) at the feed end, and the second sprocket (63) is fixed to the shaft end of the soft-tooth feeding roller (3). The chain (62) meshes with the first sprocket (61) and the second sprocket (63) respectively, so that the soft-tooth feeding roller (3) and the hollow temperature-controlled roller (11) rotate in the same direction. The end of the soft toothed feeding roller (3) is provided with an adjustment mechanism (4). The adjustment mechanism (4) includes a lifting unit and a tensioning unit that are linked together. The lifting unit adjusts the height of the soft toothed feeding roller (3), and the tensioning unit adjusts the tension of the chain (62) synchronously when adjusting the height. The conveying device also includes a heat-conducting medium circulation mechanism (5), which is connected to each hollow temperature-controlled roller (11) and supplies a constant temperature heat-conducting medium to maintain the surface temperature of the hollow temperature-controlled roller (11) at 0°C to 4°C.

2. The roller-type food conveying device according to claim 1, characterized in that, The tensioning unit includes a fixed housing (41), a servo drive assembly (42), a double-threaded screw (43), two mounting brackets (44), and two tensioning wheels (45). The servo drive assembly (42) is fixedly connected inside the fixed housing (41). The double-threaded screw (43) is connected to the output end of the servo drive assembly (42). The double-threaded screw (43) has two threads with opposite directions of rotation. The two mounting brackets (44) are respectively engaged with the two threads of the double-threaded screw (43). The two tensioning wheels (45) are respectively rotatably connected to the sides of the two mounting brackets (44) and symmetrically distributed on both sides of the chain (62). The fixed housing (41) is provided with a first linear slide rail (46). The mounting brackets (44) are slidably connected to the first linear slide rail (46).

3. The roller-type food conveying device according to claim 2, characterized in that, The lifting unit includes a first connecting frame (47), a first wedge block (49), a second wedge block (410), and a second connecting frame (412). The first connecting frame (47) is fixedly connected to the mounting frame (44). The first wedge block (49) is fixedly connected to the upper end of the first connecting frame (47). The first wedge block (49) and the second wedge block (410) are slidably engaged by the wedge surface. The bottom of the second wedge block (410) is fixedly connected to the second connecting frame (412). The bottom of the second connecting frame (412) is rotatably connected to the end of the soft tooth feeding roller (3).

4. The roller-type food conveying device according to claim 3, characterized in that, The lifting unit further includes a second linear slide rail (48) and an elastic telescopic component (413). The second linear slide rail (48) is installed on the upper part of the fixed housing (41), and the first wedge block (49) is slidably connected to the second linear slide rail (48). One end of the elastic telescopic component (413) is fixedly connected to the inner top wall of the fixed housing (41), and the other end is fixedly connected to the upper part of the second connecting frame (412). A guide rail (411) is fixedly connected to the upper surface of the second wedge block (410), and the first wedge block (49) is slidably connected to the guide rail (411). The cross-section of the guide rail (411) is cross-shaped.

5. The roller-type food conveying device according to claim 1, characterized in that, The heat transfer medium circulation mechanism (5) includes a constant temperature circulation machine body (51), a circulation outlet pipe (52), a circulation inlet pipe (53), a distributor (54), a collector (55), and a rotary joint (56). The outlet end of the constant temperature circulation machine body (51) is equipped with a circulation outlet pipe (52), and the end of the circulation outlet pipe (52) is equipped with a distributor (54). The distributor (54) is connected to the rotary joint (56) at the inlet end of each hollow temperature control roller (11) through each branch pipe. The inlet end of the constant temperature circulation machine body (51) is equipped with a circulation inlet pipe (53), and the end of the circulation inlet pipe (53) is equipped with a collector (55). The collector (55) is connected to the rotary joint (56) at the outlet end of each hollow temperature control roller (11) through each branch pipe. The rotary joint (56) is installed at both ends of each hollow temperature control roller (11).

6. The roller-type food conveying device according to claim 5, characterized in that, The hollow temperature control roller (11) includes a cylinder (111), a central tube (113), a spiral guide plate (114), and two medium guide heads (115). The central tube (113) is coaxially installed inside the cylinder (111). The spiral guide plate (114) is fixedly connected to the outer wall of the central tube (113) and extends spirally along the axial direction. The spiral guide plate (114) is located in the annular cavity between the central tube (113) and the cylinder (111). The two medium guide heads (115) are respectively fixedly connected to both ends of the central tube (113). The medium guide head (115) is connected to the rotary joint (56) at the corresponding end. The heat transfer medium enters the annular cavity from the medium guide head (115) at one end, is guided by the spiral guide plate (114) to flow along the spiral path to the other end, and flows out from the medium guide head (115) at the other end.

7. The roller-type food conveying device according to claim 6, characterized in that, The outer surface of the cylinder (111) is coated with an elastic coating (112), and the surface of the elastic coating (112) is provided with an array of micro-pits.

8. The roller-type food conveying device according to claim 6, characterized in that, The end of the medium guide head (115) is fixedly connected to a flow divider plate (116), and the side wall of the medium guide head (115) is provided with multiple flow divider holes (117). After the heat conduction medium is guided by the flow divider plate (116), it enters the annular cavity evenly through the flow divider holes (117).

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