Sweet potato baking device and method capable of preventing explosion and cross contamination

Abstract

This invention discloses a sweet potato roasting device and method that prevents cracking and cross-contamination, belonging to the field of sweet potato roasting. The device includes a shell and two sets of chains rotatably connected inside the shell, with multiple sweet potato racks positioned between the chains. Each rack includes two fan-shaped plates connected to the two chains, with a thin support wire connecting the two plates and reinforcing wires on the support wire. Multiple sets of side heating wires are disposed inside the shell. A cover plate is rotatably positioned on top of the shell. This invention solves the problem of cracking and juice leakage by employing a stepped temperature control method of first low-temperature saccharification and dehydration, followed by high-temperature caramelization, ensuring a stable release of steam from the sweet potato and maintaining its intact skin. Simultaneously, it avoids cross-contamination, effectively preventing juice from contaminating the skin of other sweet potatoes, ensuring the cleanliness and appearance of the sweet potatoes, reducing reliance on manual labor, and facilitating standardized operation.

Description

Technical Field

[0001] This invention relates to the field of sweet potato roasting technology, and in particular to a sweet potato roasting device and method that prevents explosion and cross-contamination. Background Technology

[0002] As a classic traditional specialty food, the commercial processing of roasted sweet potatoes has increasingly higher requirements for the uniformity of heating in the roasting process, the yield rate of products, and the standardization of production. At present, commercial roasted sweet potato processing on the market all adopt the process of fixed roasting of sweet potatoes, which is completed by using conventional electric ovens and fixed roasting baskets.

[0003] The core method of fixed baking of sweet potatoes in the existing technology is the root cause of many technical pain points in the processing of roasted sweet potatoes. Under fixed baking, the sweet potatoes are stationary throughout the process. The heat radiation and hot air flow in the oven can only contact the surface of the sweet potatoes from one or a few directions, which cannot achieve all-round uniform heating. This not only causes the side of the sweet potato facing the heating element to burn easily, while the side facing away from it is undercooked, resulting in uneven overall cooking. It also causes the internal moisture of the sweet potato to vaporize rapidly due to localized heating, resulting in uneven internal air pressure distribution and a sudden increase. This makes it very easy to break through the skin of the sweet potato, causing large-scale skin bursting and a large amount of internal sugar juice to leak out. This not only causes the loss of core flavor substances, but also damages the product shape. Once some sweet potatoes burst and leak juice due to uneven heating, the high-temperature sugar juice will flow and drip directly onto the skin of adjacent or lower sweet potatoes. In the high-temperature environment of the oven, the sugar juice that comes into contact with the sweet potatoes will quickly carbonize and turn black, becoming burnt and bitter. It will also cause the sweet potatoes to stick together, forming serious cross-contamination of sugar juice, which will greatly reduce the appearance and taste of the product. Summary of the Invention

[0004] The purpose of this invention is to address the problems existing in the prior art by providing a sweet potato roasting device and method that prevents explosion and cross-contamination.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A sweet potato roasting device that is explosion-proof and prevents cross-contamination includes a shell and further includes: Two sets of chains are rotatably connected inside the housing, and multiple sweet potato racks are provided between the two sets of chains; The sweet potato rack includes two fan-shaped plates respectively connected to two sets of chains, with a thin support wire connecting the two fan-shaped plates and a reinforcing wire on the thin support wire; Multiple sets of side heating wires are all located inside the housing; The cover plate is rotatably mounted on top of the housing.

[0006] Preferably, a motor is fixedly installed on the outer wall of the housing, and the output end of the motor is provided with a driving rod. A driven rod is also rotatably installed on the inner wall of the housing. Both the driving rod and the driven rod are provided with two sets of sprockets, and the two sets of chains are respectively meshed and connected with the two sets of sprockets.

[0007] Furthermore, the chain is provided with multiple thin rods, the sector plate is provided with long grooves, the thin rods are inserted into the sector plate, and the outer wall of the thin rods is threaded with nuts to limit the position of the sector plate.

[0008] Preferably, the housing is provided with a rotating shaft, the cover plate is rotatably mounted on the rotating shaft, the inner wall of the housing is provided with a fixed support block, and the side electric heating wire is fixedly mounted on the fixed support block.

[0009] Furthermore, a support rod is fixedly provided on the inner wall of the housing, and a support frame is fixedly provided at the end of the support rod away from the inner wall of the housing. An intermediate electric heating wire is fixedly provided on the inner wall of the support frame, and the intermediate electric heating wire is disposed between the chains.

[0010] Furthermore, a vent pipe is fixedly installed on the cover plate, and a vent hole corresponding to the vent pipe is provided on the cover plate. A limit block is fixedly installed on the inner wall of the vent hole, and a slide rod is slidably connected to the limit block. A baffle corresponding to the vent pipe is provided on the top of the slide rod.

[0011] Furthermore, a horizontal plate is fixedly installed on the inner wall of the housing, and a pressure plate is fixedly installed at the bottom of the slide rod. The pressure plate abuts against the top outer wall of the horizontal plate. A spring is provided between the pressure plate and the limiting block. The spring is sleeved on the outer wall of the slide rod. When the cover is opened, the baffle abuts against the vent pipe to achieve a sealing effect.

[0012] Preferably, the housing is provided with an air duct, the inner wall of the housing is provided with an oblique opening that communicates with the air duct, the outer wall of the housing is provided with a fan, the fan is connected to the end of the air duct away from the oblique opening, and the housing is provided with heat dissipation holes on the side opposite to the oblique opening.

[0013] Furthermore, the inner wall of the housing is slidably provided with a vertical plate corresponding to the inclined opening. The vertical plate is provided with a protrusion slidably connected to the housing. The outer wall of the vertical plate is provided with a horizontal rack plate. The housing is slidably connected with a vertical rack plate. A pinion is rotatably provided inside the housing. Both the horizontal rack plate and the vertical rack plate mesh with the pinion, and the horizontal rack plate and the vertical rack plate are staggered. The vertical rack plate is provided with multiple small holes, and the top of the vertical rack plate is provided with a limiting plate.

[0014] A method for roasting sweet potatoes that prevents cracking and cross-contamination, comprising the following steps: Step 1, Preprocessing: Select sweet potatoes of uniform size, wash them, and place them in a ventilated place to remove surface moisture; Step 2, Furnace Placement and Isolation: Place the sweet potatoes one by one into the sweet potato rack, ensuring that the sweet potatoes do not touch each other; Step 3, stepped temperature control baking: The first stage is the low-temperature saccharification and dehydration stage; Adjust the internal side heating wire of the shell to the range of 160℃-200℃ and bake for 20-40 minutes. During this stage, the sweet potato will slowly heat up, promote the conversion of amylase into sugar, and at the same time, the skin will be moderately dehydrated and toughened to prevent cracking later. The second stage is the medium-temperature ripening stage; Set the temperature to 150℃-180℃ and bake for 20-40 minutes to ensure the sweet potatoes are thoroughly cooked inside. Flip them 180 degrees as indicated by the equipment. The third stage is the high-temperature caramelization stage; Finally, adjust the temperature to the range of 180℃-200℃ and bake for 10-15 minutes to force out the sugar on the surface of the sweet potato and create a caramel flavor. Since the internal moisture has been released steadily in the early stage, the high temperature will not cause it to burst.

[0015] Compared with the prior art, the present invention provides a sweet potato roasting device and method that prevents explosion and cross-contamination, and has the following beneficial effects: 1. This explosion-proof and cross-contamination-proof sweet potato roasting device selects sweet potatoes of uniform size, washes them, and places them in a ventilated area to remove surface moisture. Then, the pre-treated sweet potatoes are placed one by one into the sweet potato rack, ensuring that the sweet potatoes do not touch each other and that there are drip-collecting baffles between the upper and lower layers. Then, the cover is closed, and the side heating wires are energized to achieve heating and roasting. At the same time, the chain is controlled to rotate, so that the rotating chain drives the multiple sets of sweet potato racks to rotate in a cycle, thereby improving the roasting effect.

[0016] 2. The explosion-proof and cross-contamination-proof sweet potato roasting device and method adopts a stepped temperature control roasting process: The first stage is a low-temperature saccharification and dehydration stage, in which the sweet potato is slowly heated to promote the conversion of amylase into sugar, while the skin is moderately dehydrated and toughened to prevent later explosion; the second stage is a medium-temperature cooking stage, which makes the inside of the sweet potato thoroughly cooked; the third stage is a high-temperature caramelization stage, which forces out the sugar on the surface of the sweet potato to form a caramel flavor. Since the internal moisture has been released steadily in the early stage, the high temperature at this time will not cause explosion. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a sweet potato roasting device that is explosion-proof and prevents cross-contamination, as proposed in this invention. Figure 2This is a cross-sectional structural diagram of a sweet potato roasting device that is explosion-proof and prevents cross-contamination, as proposed in this invention. Figure 1 ; Figure 3 This is a side cross-sectional view of a sweet potato roasting device that is explosion-proof and prevents cross-contamination, as proposed in this invention. Figure 4 This is a schematic diagram of the structure of a sweet potato roasting device without a cover plate, which is designed to prevent explosion and cross-contamination according to the present invention. Figure 5 This is a cross-sectional structural diagram of a sweet potato roasting device that is explosion-proof and prevents cross-contamination, as proposed in this invention. Figure 2 ; Figure 6 This is a cross-sectional structural diagram of a sweet potato roasting device that is explosion-proof and prevents cross-contamination, as proposed in this invention. Figure 3 ; Figure 7 This is a schematic diagram of the structure of the upright plate in a sweet potato roasting device that is explosion-proof and prevents cross-contamination, as proposed in this invention. Figure 8 This is a schematic diagram of the structure of a sweet potato rack mounted on a chain in a sweet potato roasting device that is explosion-proof and prevents cross-contamination, as proposed in this invention. Figure 9 This is a schematic diagram of the sweet potato placement rack in a sweet potato roasting device that is explosion-proof and prevents cross-contamination, as proposed in this invention. Figure 10 This invention proposes a sweet potato roasting device that is explosion-proof and prevents cross-contamination. Figure 2 Enlarged view of section A.

[0018] In the diagram: 1. Housing; 101. Shaft; 102. Cover plate; 103. Fan; 104. Air duct; 105. Slanted opening; 106. Heat dissipation hole; 107. Horizontal plate; 108. Side electric heating wire; 109. Fixed support block; 2. Motor; 201. Driving rod; 202. Driven rod; 203. Sprocket; 204. Chain; 205. Thin rod; 206. Sector plate; 207. Long slot; 208. Nut; 209. Fine support wire; 210. Reinforcing wire; 3. Vent pipe; 301. Vent hole; 302. Slide rod; 303. Limiting block; 304. Spring; 305. Baffle; 4. Vertical plate; 401. Protrusion; 402. Horizontal rack plate; 403. Pinion; 404. Vertical rack plate; 405. Limiting plate; 406. Small hole; 5. Support rod; 501. Support frame; 502. Intermediate electric heating wire. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0020] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0021] Example 1: Refer to Figures 1-10 A sweet potato roasting device that is explosion-proof and prevents cross-contamination includes a housing 1 and two sets of chains 204 rotatably connected inside the housing 1. Multiple sweet potato racks are arranged between the two sets of chains 204. Each sweet potato rack includes two fan-shaped plates 206 respectively connected to the two sets of chains 204. A thin support wire 209 is connected between the two fan-shaped plates 206, and a reinforcing wire 210 is provided on the thin support wire 209. Multiple sets of side electric heating wires 108 are arranged inside the housing 1. A cover plate 102 is rotatably arranged on the top of the housing 1.

[0022] In this embodiment, the sweet potatoes to be roasted are first pre-treated. Specifically, uniformly sized sweet potatoes are selected, washed, and placed in a ventilated area to remove surface moisture. Then, the pre-treated sweet potatoes are placed one by one into the sweet potato rack, ensuring they do not touch each other and that there are drip-collecting baffles between the upper and lower layers. The cover plate 102 is then placed on top, and the side heating wire 108 is energized to heat and roast the sweet potatoes. Simultaneously, the chain 204 is rotated, causing multiple sets of sweet potato racks to rotate cyclically, thus improving roasting efficiency. Regarding the effect, it should be noted that in this application, the electrode terminals of the side heating wire 108 extend from inside the housing 1 to the room temperature area of ​​the back or side wall of the housing 1. The housing 1 is the outer shell of the furnace body. The electrode terminals of the side heating wire 108 are externally connected to pure copper nickel-plated high-temperature resistant terminals. At the same time, a control box is provided outside the housing 1. This control box can control the temperature of the side heating wire 108 and the start and stop of the motor 2. Specifically, the terminals of the side heating wire 108 are firmly crimped to the silicone rubber high-temperature resistant cable led out from the power distribution control box outside the housing 1. High-temperature heat-shrink tubing is used for protection to prevent poor contact and electrical sparks. High-temperature cables are electrically connected to the control box's air switch, thermostat, AC contactor, and other electrical components. The control box is connected to an external mains power supply circuit, which includes overload and short-circuit protection devices to ensure safe power supply and electrical protection for the heating wire. Precise temperature adjustment is achieved by controlling the energization or de-energization of the side heating wire 108. Operators can directly select preset tiered baking programs on the control box's digital display panel or manually set the target temperature, accurately adapting to different stages of sweet potato baking. To ensure uniform temperature within the oven, this application focuses on a stepped temperature control method for roasting sweet potatoes: The first stage is a low-temperature saccharification and dehydration stage, during which the sweet potatoes are slowly heated to promote the conversion of amylase into sugar, while the skin is moderately dehydrated and toughened to prevent later cracking; the second stage is a medium-temperature cooking stage, which ensures that the sweet potatoes are thoroughly cooked inside, and a 180-degree flipping operation is performed according to the equipment prompts; the third stage is a high-temperature caramelization stage, which forces out the sugar on the surface of the sweet potatoes to form a caramel flavor. Since the internal moisture has been steadily released in the early stage, the high temperature at this stage will not cause cracking.

[0023] This application completely solves the problem of sweet potatoes bursting and leaking juice. It abandons the conventional method of constant temperature baking throughout the process and adopts a stepped temperature control method of first low-temperature saccharification and dehydration, followed by high-temperature caramelization. This allows for a stable release of steam from the inside of the sweet potato, keeping the skin intact. At the same time, it avoids cross-contamination and improves the appearance. When used with a contamination-proof sweet potato rack, even if some sweet potatoes leak sap due to excessive sugar content, it will fall into the bottom inner wall of shell 1, effectively preventing the juice from contaminating the skin of other sweet potatoes and ensuring the cleanliness and appearance of each sweet potato. In addition, the addition of a low-temperature saccharification stage provides the amylase with the optimal temperature range for its action, converting more maltose, making the baked sweet potatoes sweeter, softer, and more glutinous, improving the taste and sweetness. Through clear stepped temperature and time settings, it reduces the reliance on traditional experience of judging softness and glutinousness by touch due to the varying sizes of sweet potatoes, making it easier for store employees to perform standardized operations, reducing reliance on manual labor, and facilitating standardized operation.

[0024] Example 2: Refer to Figures 1-10 A sweet potato roasting device that is explosion-proof and prevents cross-contamination includes a housing 1 and two sets of chains 204 rotatably connected inside the housing 1. Multiple sweet potato racks are arranged between the two sets of chains 204. Each sweet potato rack includes two fan-shaped plates 206 respectively connected to the two sets of chains 204. A thin support wire 209 is connected between the two fan-shaped plates 206, and a reinforcing wire 210 is provided on the thin support wire 209. Multiple sets of side electric heating wires 108 are arranged inside the housing 1. A cover plate 102 is rotatably arranged on the top of the housing 1.

[0025] Reference Figures 1-6 and Figure 8 A motor 2 is fixedly installed on the outer wall of the housing 1. The output end of the motor 2 is provided with a drive rod 201. A driven rod 202 is also rotatably installed on the inner wall of the housing 1. Two sets of sprockets 203 are provided on both the drive rod 201 and the driven rod 202. The two sets of chains 204 are respectively meshed with the two sets of sprockets 203.

[0026] Reference Figures 1-6 , Figure 8 and Figure 9 The chain 204 is provided with a plurality of thin rods 205, the sector plate 206 is provided with a long groove 207, the thin rods 205 are inserted into the sector plate 206, and the outer wall of the thin rods 205 is threaded with a nut 208 for limiting the position of the sector plate 206.

[0027] In this embodiment, after the pre-treated sweet potatoes are placed on the sweet potato rack, the side heating wire 108 is energized for heating, and the motor 2 is started, causing the output end of the drive rod 201 to rotate. This causes the sprocket 203 connected to the drive rod 201 to rotate, thereby driving the chain 204 to rotate. At the same time, the driven rod 202 and the sprocket 203 on the driven rod 202 also move with the chain 204, providing support for the movement of the chain 204 and making the rotation of the chain 204 more stable. Meanwhile, the sweet potato rack located on the chain 204 will also rotate with the chain 204, thereby driving the sweet potatoes to move in a cycle to achieve the roasting effect. During the movement, the outer surface of the sweet potatoes can be heated in a cycle, resulting in more even roasting and avoiding cracking caused by excessive roasting time in one place. This completely solves the problem of bursting and leaking juice, keeping the skin intact; at the same time, it can avoid cross-contamination caused by skin cracking.

[0028] During installation, the sweet potato rack in this application first inserts the long grooves 207 on the two fan-shaped plates 206 into the thin rods 205 on the two chains 204, so that the two thin rods 205 support the fan-shaped plates 206. The thin support wires 209 and reinforcing wires 210 can support the sweet potatoes and prevent them from falling off during baking. The thin support wires 209 also allow the bottom surface of the sweet potatoes to be heated, resulting in more even heating. Secondly, the reinforcing wires 210 can strengthen the multiple thin support wires 209 to prevent them from breaking. The ends of the thin rods 205 are provided with threaded grooves. After the fan-shaped plates 206 are hung on the thin rods 205, nuts 208 are threaded into the threaded grooves to limit the fan-shaped plates 206 and prevent them from falling off the thin rods 205.

[0029] Reference Figures 1-6 The housing 1 is provided with a rotating shaft 101, the cover plate 102 is rotatably mounted on the rotating shaft 101, the inner wall of the housing 1 is provided with a fixed support block 109, and the side electric heating wire 108 is fixedly mounted on the fixed support block 109. The rotating shaft 101 makes it easy to open and close the cover plate 102, and the fixed support block 109 makes it easy to install the side electric heating wire 108, thus improving the performance.

[0030] Reference Figure 5 A support rod 5 is fixedly provided on the inner wall of the housing 1. A support frame 501 is fixedly provided at the end of the support rod 5 away from the inner wall of the housing 1. An intermediate electric heating wire 502 is fixedly provided on the inner wall of the support frame 501. The intermediate electric heating wire 502 is disposed between the chains 204.

[0031] In this embodiment, during use, the intermediate electric heating wire 502 located inside the housing 1 can heat and roast the sweet potato in the middle position, so that the sweet potato can be roasted all at the same time, avoiding cracking when roasting one side. The support rod 5 and the support frame 501 can support and protect the intermediate electric heating wire 502, making it easier to install the intermediate electric heating wire 502.

[0032] Example 3: Refer to Figures 1-10 A sweet potato roasting device that is explosion-proof and prevents cross-contamination includes a housing 1 and two sets of chains 204 rotatably connected inside the housing 1. Multiple sweet potato racks are arranged between the two sets of chains 204. Each sweet potato rack includes two fan-shaped plates 206 respectively connected to the two sets of chains 204. A thin support wire 209 is connected between the two fan-shaped plates 206, and a reinforcing wire 210 is provided on the thin support wire 209. Multiple sets of side electric heating wires 108 are arranged inside the housing 1. A cover plate 102 is rotatably arranged on the top of the housing 1. Similar to Embodiment 2, but further, a vent pipe 3 is fixedly arranged on the cover plate 102, and a vent hole 301 corresponding to the vent pipe 3 is provided on the cover plate 102. A limit block 303 is fixedly arranged on the inner wall of the vent hole 301, and a sliding rod 302 is slidably connected to the limit block 303. A baffle 305 corresponding to the vent pipe 3 is provided on the top of the sliding rod 302.

[0033] Reference Figure 10 A horizontal plate 107 is fixedly installed on the inner wall of the housing 1, and a pressure plate is fixedly installed at the bottom of the slide rod 302. The pressure plate abuts against the top outer wall of the horizontal plate 107. A spring 304 is provided between the pressure plate and the limiting block 303. The spring 304 is sleeved on the outer wall of the slide rod 302. When the cover plate 102 is opened, the baffle 305 abuts against the vent pipe 3 to achieve a sealing effect.

[0034] In this embodiment, when the cover plate 102 is closed, the pressure plate at the bottom of the cover plate 102 first contacts the horizontal plate 107, causing the horizontal plate 107 to push the pressure plate to move. This causes the pressure plate to move the sliding rod 302, which in turn moves the baffle 305 at its top. Initially, the baffle 305 and the vent pipe 3 are in contact. Specifically, the bottom outer wall of the baffle 305 and the top inner wall of the vent pipe 3 are provided with matching conical surfaces. When the conical surfaces of the two are in contact, a sealing effect is achieved, preventing dust or gas from entering the inner wall of the housing 1 through the vent pipe 3. When the cover plate 102 is closed, the baffle 305 loses its contact with the vent pipe 3. When the air pipe 3 is blocked, moisture inside the shell 1 can be discharged, preventing excessive moisture on the inner wall. Excessive moisture prevents the sweet potato skin from dehydrating and becoming tough, making it prone to bursting and leaking juice due to internal air pressure, thus increasing the defect rate. This application utilizes the natural rising characteristics of hot steam to efficiently discharge moisture, reduce humidity inside the furnace, and reduce sweet potato bursting at the source. It maintains a dry and hot environment inside the furnace, promotes caramelization, and enhances the sweet potato's sweet and glutinous texture and pure caramel aroma. The spring 304 allows the slide bar 302 and baffle 305 to automatically reset when the cover 102 is opened, and multiple limit blocks 303 provide support for the slide bar 302, making it easy to move.

[0035] Example 4: Refer to Figures 1-10 A sweet potato roasting device that is explosion-proof and prevents cross-contamination is basically the same as that in Embodiment 3. Furthermore, the housing 1 is provided with an air duct 104, the inner wall of the housing 1 is provided with an oblique opening 105 that communicates with the air duct 104, the outer wall of the housing 1 is provided with a fan 103, the fan 103 is connected to the end of the air duct 104 away from the oblique opening 105, and the housing 1 is provided with a heat dissipation hole 106 on the side opposite to the oblique opening 105.

[0036] The inner wall of the housing 1 is slidably provided with a vertical plate 4 corresponding to the inclined opening 105. The vertical plate 4 is provided with a protrusion 401 slidably connected to the housing 1. The outer wall of the vertical plate 4 is provided with a horizontal rack plate 402. The housing 1 is slidably connected with a vertical rack plate 404. A pinion 403 is rotatably provided inside the housing 1. The horizontal rack plate 402 and the vertical rack plate 404 are both meshed with the pinion 403. The horizontal rack plate 402 and the vertical rack plate 404 are staggered. The vertical rack plate 404 is provided with a plurality of small holes 406. The top of the vertical rack plate 404 is provided with a limiting plate 405.

[0037] In this embodiment, a hot air circulation system is also provided. Specifically, the fan 103 draws in outside air and delivers it into the air duct 104, where it is discharged through the inclined port 105. The air then blows the hot air onto the sweet potatoes on the sweet potato rack to improve the roasting effect. At the same time, the blown air can be discharged through the heat dissipation hole 106 to improve the circulation effect.

[0038] Furthermore, when the cover plate 102 is closed, it will press the limiting plate 405 to move downward, thereby causing the limiting plate 405 to drive the vertical rack plate 404 to move downward, and then drive the pinion 403 to rotate, so that the pinion 403 meshes with the horizontal rack plate 402, causing the horizontal rack plate 402 to drive the vertical plate 4 to move. In the initial state, the vertical plate 4 seals the inclined opening 105 to prevent dust and other objects from entering the inclined opening 105. When the cover plate 102 is closed, the vertical plate 4 moves, causing the inclined opening 105 to open. At this time, the fan 103 can complete the gas circulation operation, and the provided protrusion 401 can make the movement of the vertical plate 4 more stable. In addition, multiple small holes 406 are provided on the vertical rack plate 404. When not in use, rods are connected to the small holes 406 to limit the position of the vertical rack plate 404, so that the vertical plate 4 can seal the inclined opening 105.

[0039] Example 5: A method for roasting sweet potatoes to prevent cracking and cross-contamination, comprising the following steps: Step 1, Preprocessing: Select sweet potatoes of uniform size, wash them, and place them in a ventilated place to remove surface moisture; Step 2, Furnace Placement and Isolation: Place the sweet potatoes one by one into the sweet potato rack, ensuring that the sweet potatoes do not touch each other; Step 3, stepped temperature control baking: The first stage is the low-temperature saccharification and dehydration stage; Adjust the heating wire inside shell 1 to the range of 160℃-200℃ and bake for 20-40 minutes. During this stage, the sweet potato heats up slowly, promoting the conversion of amylase into sugar. At the same time, the skin is moderately dehydrated and toughened to prevent cracking later.

[0040] The second stage is the medium-temperature ripening stage; Set the temperature to 150℃-180℃ and bake for 20-40 minutes to ensure the sweet potatoes are thoroughly cooked. Flip them 180 degrees as indicated by the equipment.

[0041] The third stage is the high-temperature caramelization stage; Finally, adjust the temperature to the range of 180℃-200℃ and bake for 10-15 minutes to force out the sugar on the surface of the sweet potato and create a caramel flavor. Since the internal moisture has been released steadily in the early stage, the high temperature will not cause it to burst.

[0042] 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 sweet potato roasting device that is explosion-proof and prevents cross-contamination, comprising a shell (1), characterized in that, Also includes: Two sets of chains (204) are rotatably connected inside the housing (1), and multiple sweet potato racks are provided between the two sets of chains (204); The sweet potato rack includes two fan-shaped plates (206) respectively connected to two sets of chains (204), and a thin support wire (209) is connected between the two fan-shaped plates (206). The thin support wire (209) is provided with a reinforcing wire (210). Multiple sets of side heating wires (108) are all installed inside the housing (1); The cover plate (102) is rotatably mounted on the top of the housing (1).

2. The explosion-proof and cross-contamination-proof sweet potato roasting device according to claim 1, characterized in that, A motor (2) is fixedly installed on the outer wall of the housing (1). The output end of the motor (2) is provided with a drive rod (201). A driven rod (202) is also rotatably installed on the inner wall of the housing (1). Two sets of sprockets (203) are provided on both the drive rod (201) and the driven rod (202). The two sets of chains (204) are respectively meshed with the two sets of sprockets (203).

3. The explosion-proof and cross-contamination-proof sweet potato roasting device according to claim 2, characterized in that, The chain (204) is provided with a plurality of thin rods (205), the sector plate (206) is provided with a long groove (207), the thin rods (205) are inserted into the sector plate (206), and the outer wall of the thin rods (205) is threaded with nuts (208) to limit the position of the sector plate (206).

4. The explosion-proof and cross-contamination-proof sweet potato roasting device according to claim 1, characterized in that, The housing (1) is provided with a rotating shaft (101), the cover plate (102) is rotatably mounted on the rotating shaft (101), the inner wall of the housing (1) is provided with a fixed support block (109), and the side electric heating wire (108) is fixedly mounted on the fixed support block (109).

5. The explosion-proof and cross-contamination-proof sweet potato roasting device according to claim 4, characterized in that, A support rod (5) is fixedly provided on the inner wall of the housing (1). A support frame (501) is fixedly provided at one end of the support rod (5) away from the inner wall of the housing (1). An intermediate electric heating wire (502) is fixedly provided on the inner wall of the support frame (501). The intermediate electric heating wire (502) is arranged between the chains (204).

6. The explosion-proof and cross-contamination-proof sweet potato roasting device according to claim 4, characterized in that, A vent pipe (3) is fixedly installed on the cover plate (102). A vent hole (301) corresponding to the vent pipe (3) is provided on the cover plate (102). A limit block (303) is fixedly installed on the inner wall of the vent hole (301). A slide rod (302) is slidably connected on the limit block (303). A baffle (305) corresponding to the vent pipe (3) is provided on the top of the slide rod (302).

7. The explosion-proof and cross-contamination-proof sweet potato roasting device according to claim 6, characterized in that, A horizontal plate (107) is fixedly installed on the inner wall of the housing (1), and a pressure plate is fixedly installed at the bottom of the slide rod (302). The pressure plate abuts against the top outer wall of the horizontal plate (107). A spring (304) is provided between the pressure plate and the limiting block (303). The spring (304) is sleeved on the outer wall of the slide rod (302). When the cover plate (102) is opened, the baffle (305) abuts against the vent pipe (3) to achieve a sealing effect.

8. The sweet potato roasting device according to claim 1, characterized in that, The housing (1) is provided with an air duct (104), the inner wall of the housing (1) is provided with an oblique opening (105) that communicates with the air duct (104), the outer wall of the housing (1) is provided with a fan (103), the fan (103) is connected to the end of the air duct (104) away from the oblique opening (105), and the housing (1) is provided with a heat dissipation hole (106) on the side opposite to the oblique opening (105).

9. The explosion-proof and cross-contamination-proof sweet potato roasting device according to claim 8, characterized in that, The inner wall of the housing (1) is slidably provided with a vertical plate (4) corresponding to the inclined opening (105). The vertical plate (4) is provided with a protrusion (401) slidably connected to the housing (1). The outer wall of the vertical plate (4) is provided with a horizontal rack plate (402). The housing (1) is slidably connected with a vertical rack plate (404). A pinion (403) is rotatably provided inside the housing (1). The horizontal rack plate (402) and the vertical rack plate (404) are both meshed with the pinion (403). The horizontal rack plate (402) and the vertical rack plate (404) are staggered. The vertical rack plate (404) is provided with a plurality of small holes (406). The top of the vertical rack plate (404) is provided with a limiting plate (405).

10. A method for roasting sweet potatoes that prevents explosion and cross-contamination, comprising the sweet potato roasting apparatus for preventing explosion and cross-contamination as described in any one of claims 1-9, characterized in that, Follow these steps: Step 1, Preprocessing: Select sweet potatoes of uniform size, wash them, and place them in a ventilated place to remove surface moisture; Step 2, Furnace Placement and Isolation: Place the sweet potatoes one by one into the sweet potato rack, ensuring that the sweet potatoes do not touch each other; Step 3, stepped temperature control baking: The first stage is the low-temperature saccharification and dehydration stage; Adjust the electric heating wire inside the shell (1) to the range of 160℃-200℃ and bake for 20-40 minutes. During this stage, the sweet potato will slowly heat up, promote the conversion of amylase into sugar, and at the same time, the skin will be moderately dehydrated and toughened to prevent later cracking. The second stage is the medium-temperature ripening stage; Increase the temperature to 150℃-180℃ and bake for 20-40 minutes to ensure the sweet potatoes are thoroughly cooked inside. The third stage is the high-temperature caramelization stage; Finally, adjust the temperature to the range of 180℃-200℃ and bake for 10-15 minutes to force out the sugar on the surface of the sweet potato and create a caramel flavor. Since the internal moisture has been released steadily in the early stage, the high temperature will not cause it to burst.

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