Sweet potato processing apparatus and method for processing sweet potato

Abstract

The present invention provides a processing apparatus capable of sterilizing sweet potatoes and preserving them for a long period of time. A sweet potato processing apparatus (100) according to the present invention comprises: a sterilization / washing device (30) that sterilizes and washes sweet potatoes (200); an introduction / conveyance device (20) that introduces the sweet potatoes (200) to the sterilization / washing device (30); and a sweet potato discharge device (40) that moves the sweet potatoes (200) treated by the sterilization / washing device (30) downstream. The sterilization / washing device (30) is provided with a plurality of brush rollers (60) for moving the sweet potatoes (200) downstream while rotating the sweet potatoes (200), and a spray device (65) for spraying cleaning water containing ozonated water toward the plurality of brush rollers (60).

Description

Sweet potato processing device and sweet potato processing method

[0001] The present invention relates to a sweet potato processing device and a sweet potato processing method. In particular, the present invention relates to a processing device and a processing method capable of sterilizing sweet potatoes for long-term storage. This application claims priority based on Japanese Patent Application No. 2024-197050 filed on November 11, 2024, and the entire contents of that application are incorporated herein by reference.

[0002] Sweet potato is a vine-like perennial plant cultivated in various regions. It is a hardy vegetable that is resistant to high temperatures and drought and can grow well even in poor soil. The tubers (root tubers) are used as food. Popular types of sweet potatoes in Japan include Beniharuka, Beni Azuma, Silk Sweet, Purple Sweet Road, etc.

[0003] As a method for long-term storage of raw sweet potatoes, for example, those disclosed in Patent Document 1 are known. Patent Document 1 discloses a method for long-term storage of raw sweet potatoes used as raw materials for sweet potato shochu. Raw sweet potatoes used as raw materials for sweet potato shochu are difficult to store, unlike rice and wheat that can be stored well, and are generally said to rot three days after harvest. For storing raw sweet potatoes, temperature setting and temperature control during storage are extremely important. For example, if the temperature is too high, the sweet potatoes will sprout and the freshness will decrease, and if the temperature is too low, cold damage will occur.

[0004] In the long-term storage method of Patent Document 1, raw sweet potatoes used as raw materials for sweet potato shochu are stored in a sterilization treatment room, kept at a constant first room temperature and first room humidity, the carbon dioxide concentration in the room is kept below a certain value, and the raw sweet potatoes are subjected to short-term sterilization treatment while blowing a low-speed gentle breeze on them. Then, the raw sweet potatoes are allowed to dissipate heat in the sterilization treatment room to remove the moisture adhering to the surface of the raw sweet potatoes. After that, the raw sweet potatoes are stored in a storage room, kept at a constant second room temperature and second room humidity, the carbon dioxide concentration in the room is kept below a certain value, and the air in the room is circulated to store the raw sweet potatoes for a long time. According to this long-term storage method, the storage property of raw sweet potatoes can be enhanced, and they can be stored in the storage room for a long time while maintaining their quality.

[0005] Furthermore, Patent Document 2 discloses a food washing device using ozonated water. The washing device of Patent Document 2 consists of an ozonated water generator, a rotatable cylindrical washing tank into which food ingredients are introduced and washed, a drain section formed in a part of the washing tank, and washing water piping inserted in the axial direction of the washing tank. This washing device is configured to wash food ingredients while discharging washing water sprayed from the washing water piping from the washing tank with each rotation of the washing tank. In addition, by providing a receiving tank for the washing water discharged from the washing tank and a washing water return piping that returns the washing water in the receiving tank to the inlet side of the ozonated water generator, a portion of the washing water can be returned to the raw water inlet side of the ozonated water generator and circulated, thereby significantly reducing the amount of water used. With this washing device, it is possible to continuously wash and sterilize a large amount of food ingredients with fresh ozonated water, and moreover, it is possible to provide an economical method with low water consumption.

[0006] Japanese Patent Application Publication No. 2008-161153, International Patent Publication No. WO01 / 080669

[0007] The long-term storage method for raw sweet potatoes disclosed in Patent Document 1 is particularly effective for storing raw sweet potatoes used as raw materials for sweet potato shochu, but it requires careful management of indoor temperature, indoor humidity, indoor carbon dioxide concentration, wind speed, etc., and is very laborious. Furthermore, the washing device disclosed in Patent Document 2 can be widely applied not only to raw sweet potatoes (for example, sweet potatoes) but also to grains, seeds, nuts, etc. Specifically, it is suitable for washing salad vegetables that will be eaten raw, and for sterilization to prevent deterioration and spoilage before consumption. In addition, one of the major features of the washing device disclosed in Patent Document 2 is that it significantly reduces the amount of water used by recirculating the used washing water, and it is not a device that takes into account how to improve the processing (sterilization, washing, etc.) of sweet potatoes.

[0008] This invention has been made in view of the above, and one of its main objectives is to provide a processing apparatus and processing method that can sterilize sweet potatoes and preserve them for a long period of time.

[0009] The sweet potato processing apparatus according to the present invention comprises a sterilization and washing apparatus for sterilizing and washing sweet potatoes, an introduction and conveying apparatus for introducing sweet potatoes into the sterilization and washing apparatus, and a sweet potato discharge apparatus for moving the sweet potatoes processed by the sterilization and washing apparatus downstream. The sterilization and washing apparatus is provided with a plurality of brush rollers for moving the sweet potatoes downstream while rotating them, and a spraying apparatus for spraying washing water containing ozonated water toward the plurality of brush rollers.

[0010] In one preferred embodiment, each of the plurality of brush rollers consists of a brush rotation shaft and a contact brush. In the sterilization and cleaning device, with respect to a center line flowing from upstream to downstream, a plurality of brush rotation shafts are provided on one side away from the center line, and a plurality of brush rotation shafts are provided on the other side away from the center line. The plurality of brush rollers are arranged so as to be generally concave. The arrangement surface of the plurality of brush rollers arranged in a concave curve is inclined to descend along the direction of flow from upstream to downstream.

[0011] In one preferred embodiment, each of the plurality of brush rollers consists of a brush rotation shaft and a contact brush. Multiple contact brushes are provided on one of the brush rotation shafts, from upstream to downstream of the processing device. The plurality of brush rollers are arranged so as to be generally concave. In the spraying device, multiple spray nozzles are arranged from upstream to downstream of the processing device. The plurality of spray nozzles are provided above the plurality of brush rollers.

[0012] In one preferred embodiment, the plurality of brush rollers include both a brush rotation axis that rotates clockwise and a brush rotation axis that rotates counterclockwise.

[0013] In one preferred embodiment, the plurality of brush rollers include at least one brush roller having a brush rotation axis that rotates the sweet potato in a direction away from the center line of the sterilization and cleaning device, with respect to the center line through which the sterilization and cleaning device flows from upstream to downstream.

[0014] In one preferred embodiment, the plurality of brush rollers are comprised of brush rollers equipped with brush rotation axes that rotate the sweet potatoes in a direction away from the center line of the sterilization and cleaning device, with reference to the center line through which the sterilization and cleaning device flows from upstream to downstream.

[0015] In one preferred embodiment, in a configuration in which the plurality of brush rollers are arranged, the contact brushes are arranged in a grid pattern.

[0016] In one preferred embodiment, in a configuration in which the plurality of brush rollers are arranged, a first contact brush and a second contact brush having a smaller diameter than the first contact brush are alternately arranged on the brush rotation axis.

[0017] In one preferred embodiment, the arrangement surfaces of the plurality of brush rollers in the sterilization and cleaning device are inclined to descend along the direction of flow from upstream to downstream.

[0018] In one preferred embodiment, the spraying device is provided with a cleaning water pipe to which the plurality of spray nozzles are attached. In the sterilization and cleaning device, a plurality of cleaning water pipes are provided. In the sterilization and cleaning device, the plurality of spray nozzles are arranged symmetrically with respect to a center line extending from upstream to downstream of the processing device.

[0019] In one preferred embodiment, a sweet potato discharge device for discharging the sweet potatoes is provided downstream of the sterilization and washing device. A collection container for collecting the sweet potatoes is provided downstream of the sweet potato discharge device.

[0020] In one preferred embodiment, the collection container has a storage space in which a storage basket capable of holding the sweet potatoes is arranged. The collection container is provided with a storage basket transport device for moving the storage basket.

[0021] In one preferred embodiment, the sterilization and cleaning device is connected to an ozone water generator that generates ozonated water. An input port for introducing sweet potatoes is provided on the upstream side of the introduction and conveying device. The processing device is configured such that the sweet potatoes placed in the introduction and conveying device move continuously from the upstream to the downstream side of the processing device and are discharged from the sweet potato discharge device.

[0022] In one preferred embodiment, the processing apparatus further includes a sweet potato storage section for storing sweet potatoes in an ozone atmosphere. The sweet potatoes stored in the sweet potato storage section are supplied to the introduction and conveying device and introduced to the sterilization and washing device.

[0023] The sweet potato processing method according to the present invention includes an introduction step of introducing sweet potatoes into a sterilization and washing device for sterilizing and washing sweet potatoes, a sterilization and washing step of sterilizing and washing the sweet potatoes in the sterilization and washing device, and a discharge step of discharging the sweet potatoes from the sterilization and washing device. In the sterilization and washing step, the sweet potatoes are rotated by a plurality of brush rollers and moved downstream within the sterilization and washing device while ozonated water is sprayed to wash and sterilize the sweet potatoes.

[0024] In one preferred embodiment, each of the plurality of brush rollers consists of a brush rotation shaft and a contact brush. In the sterilization and cleaning device, with respect to a center line flowing from upstream to downstream, a plurality of brush rotation shafts are provided on one side away from the center line, and a plurality of brush rotation shafts are provided on the other side away from the center line. The plurality of brush rollers are arranged so as to be generally concave. The arrangement surface of the plurality of brush rollers arranged in a concave curve is inclined to descend along the direction of flow from upstream to downstream.

[0025] In one preferred embodiment, a plurality of contact brushes are provided on a single brush rotation shaft, arranged from upstream to downstream of the sterilization and cleaning device. A spraying device that sprays cleaning water containing ozonated water has a plurality of spray nozzles arranged from upstream to downstream of the sterilization and cleaning device. The plurality of spray nozzles are provided above the plurality of brush rollers. In the sterilization and cleaning process, the sweet potatoes move upstream or downstream of the sterilization and cleaning device, scattering laterally over the plurality of brush rollers, which are arranged to be curved in an overall concave shape.

[0026] In one preferred embodiment, each of the plurality of brush rollers in the sterilization and cleaning device consists of a brush rotation shaft and a contact brush. Multiple contact brushes are provided on one of the brush rotation shafts, extending from upstream to downstream of the sterilization and cleaning device. The plurality of brush rollers are arranged so as to be generally concave when viewed from upstream or downstream of the sterilization and cleaning device. In the spraying device, multiple spray nozzles are arranged from upstream to downstream of the spraying device. The multiple spray nozzles are provided above the plurality of brush rollers. In the sterilization and cleaning process, the sweet potatoes move towards the upstream or downstream of the sterilization and cleaning device, scattering laterally over the plurality of brush rollers, which are arranged so as to be generally concave.

[0027] In one preferred embodiment, in a configuration in which the plurality of brush rollers are arranged, the contact brushes are arranged in a grid pattern, and a first contact brush and a second contact brush having a smaller diameter than the first contact brush are alternately arranged on the brush rotation axis, and the sweet potato moves from upstream to downstream on the plurality of brush rollers.

[0028] In one preferred embodiment, the sweet potatoes are introduced into the sterilization and washing device using an introduction and conveying device, and the sweet potatoes supplied to the introduction and conveying device are cured.

[0029] In one preferred embodiment, the cured sweet potatoes are subjected to a step of being stored in an ozone atmosphere.

[0030] In one preferred embodiment, the process of making baked sweet potatoes is further carried out by heating the sweet potatoes that have undergone the sterilization and washing process.

[0031] According to the present invention, a sterilization and washing device for sterilizing and washing sweet potatoes is provided with a plurality of brush rollers and a spraying device that sprays washing water containing ozonated water. The sweet potatoes can be moved downstream while rotating while the ozonated water is being sprayed, and as a result, a processing device is provided that can sterilize sweet potatoes and preserve them for a long period of time.

[0032] This is a schematic perspective view showing the configuration of a sweet potato processing apparatus 100 according to an embodiment of the present invention. This is a perspective view of the configuration of the sweet potato processing apparatus 100 as seen from the side. This is a perspective view of the configuration of the sweet potato processing apparatus 100 as seen from the inlet (upstream side). This is a perspective view showing the configuration of the sweet potato introduction and conveying device 20 in the sweet potato processing apparatus 100. This is a perspective view of the configuration of the sweet potato processing apparatus 100 as seen from the outlet (downstream side). This is a perspective view of the configuration of the sterilization and washing device 30 in the sweet potato processing apparatus 100 as seen from the outlet (downstream side). This is an enlarged perspective view of the configuration of the sterilization and washing device 30 in the sweet potato processing apparatus 100 as seen from the outlet (downstream side). (a) and (b) are diagrams schematically illustrating the cross-sectional configuration of the sterilization and washing devices 130 and 30. This is a diagram schematically showing a state in which the contact brushes 63 are arranged in a grid pattern in a configuration in which a plurality of brush rollers 60 are arranged. This is a flowchart for explaining the sweet potato processing method according to an embodiment of the present invention. This is a schematic top view showing the configuration of the sweet potato processing apparatus 100. This is a schematic side view showing the configuration of the sweet potato processing apparatus 100. This is a schematic side view showing the configuration of the sweet potato introduction and conveying apparatus 20. This is a schematic diagram showing the collection container 50 in the sweet potato processing apparatus 100. This is a substitute photograph showing the state of the sweet potatoes 200. This is a substitute photograph showing the state of the sweet potatoes 200 being conveyed by the sweet potato introduction and conveying apparatus 20. This is a substitute photograph showing the state of the sweet potatoes 200 rotating and moving in the sterilization and washing apparatus 30. This is a substitute photograph showing the state of the sweet potatoes 200 being collected from the sweet potato discharge apparatus 40 into the collection container 50.

[0033] Preferred embodiments of the present invention will be described below with reference to the drawings. In the following drawings, for the sake of brevity, the same reference numerals are used for members and parts that perform the same function, and redundant explanations may be omitted or simplified. Also, the dimensional relationships (length, width, thickness, etc.) in each drawing may not necessarily accurately reflect the actual dimensional relationships.

[0034] Furthermore, matters other than those specifically mentioned herein but necessary for carrying out the present invention can be understood as design matters for those skilled in the art based on the prior art. The present invention can be carried out based on the contents disclosed herein and in the drawings and common technical knowledge in the art. In addition, the present invention is not limited to the following embodiments.

[0035] Figure 1 schematically shows the overall configuration of a sweet potato processing apparatus 100 according to an embodiment of the present invention. Figure 2 shows the overall side configuration of the sweet potato processing apparatus 100 of this embodiment. Furthermore, Figure 3 is a perspective view of the configuration of the sweet potato processing apparatus 100 as seen from the inlet (upstream side). And Figure 4 is a perspective view showing the configuration of the sweet potato introduction and conveying device 20 in the sweet potato processing apparatus 100. In addition, Figure 5 is a perspective view of the configuration of the sweet potato processing apparatus 100 as seen from the outlet (downstream side). Figure 6 is a perspective view of the configuration of the sterilization and washing device 30 in the sweet potato processing apparatus 100 as seen from the outlet (downstream side). And Figure 7 is an enlarged perspective view of the configuration of the sterilization and washing device 30 in the sweet potato processing apparatus 100 as seen from the outlet (downstream side).

[0036] As shown in Figures 1 and 2, the sweet potato processing apparatus 100 of this embodiment consists of a sterilization and washing device 30 for sterilizing and washing sweet potatoes, an introduction and conveying device 20 (sweet potato introduction and conveying device) for introducing sweet potatoes into the sterilization and washing device 30, and a sweet potato discharge device 40 for moving the sweet potatoes processed in the sterilization and washing device 30 downstream. As shown in Figure 7, the sterilization and washing device 30 of this embodiment is provided with a plurality of brush rollers 60 for moving the sweet potatoes downstream while rotating them, and a spraying device 65 for spraying washing water containing ozonated water toward the plurality of brush rollers 60. The sterilization and washing device 30 of this embodiment is also connected to an ozonated water generator (not shown) for generating ozonated water. Here, the processing apparatus 100 is configured such that sweet potatoes placed on the introduction and conveying device 20 (belt conveyor 21) move continuously from upstream to downstream of the processing apparatus 100, pass through the sterilization and washing device 30, and are discharged from the sweet potato discharge device 40. In this embodiment, the side into which the sweet potatoes are introduced will be described as the upstream side, and the side into which they are discharged will be described as the downstream side.

[0037] As shown in Figure 3, the sweet potato introduction and conveying device 20 of this embodiment is a conveying device that extends from the sweet potato input section 10 to the sterilization and washing device 30, and specifically consists of a belt conveyor 21. The sweet potato input section 10 of this embodiment is a metal (for example, stainless steel) container, and one end (upstream side) of the belt conveyor 21 of the sweet potato introduction and conveying device 20 is located inside it.

[0038] Furthermore, the sweet potato input section 10 is provided with a sweet potato input plate (inclined plate) 11 for inputting sweet potatoes. In other words, an input port 11 (input plate, inclined plate) for inputting sweet potatoes is provided on the upstream side of the introduction and conveying device 20). By inputting sweet potatoes toward the sweet potato input plate (inclined plate) 11, the sweet potatoes enter the sweet potato input section 10 and are then transported by the belt conveyor 21 toward the sterilization and washing device 30. In addition, the sweet potato input section 10 is also provided with a mounting platform (mounting plate) 12, on which a basket containing sweet potatoes can be placed. Sweet potatoes can also be input into the sweet potato input section 10 by tilting the basket from the mounting platform (mounting plate) 12.

[0039] As shown in Figures 3 and 4, the belt conveyor 21 of the sweet potato introduction and conveying device 20 extends upward from the position of the sweet potato input section 10, which is close to the ground, and reaches the sterilization and washing device 30. Furthermore, the belt conveyor 21 that reaches the sterilization and washing device 30 is configured to pass under the back of the mounting surface (front and top surface) on which the sweet potatoes are placed, and exit (rotate) from the sweet potato input section 10.

[0040] The sterilization and cleaning device 30 of this embodiment consists of a metal (for example, stainless steel) housing 31 and a roof 32. The sterilization and cleaning device 30 has an inlet (upstream opening) 71 into which sweet potatoes are introduced from the sweet potato introduction and conveying device 20. Multiple brush rollers 60 are arranged inside the sterilization and cleaning device 30. The multiple brush rollers 60 can move the sweet potatoes from upstream to downstream in the sterilization and cleaning device 30 while rotating them.

[0041] As shown in Figures 5 and 6, a discharge port (downstream opening) 72 for discharging sweet potatoes is located downstream of the sterilization and washing device 30. In this embodiment, a transfer component (chute) 33 is provided downstream of the sterilization and washing device 30 for sliding the sweet potatoes onto the belt conveyor 41. Further downstream of the sterilization and washing device 30 is a sweet potato discharge device (discharge and conveying device) 40, which consists of the belt conveyor 41. As shown in Figure 5, a collection container 50 (sweet potato collection container) for collecting sweet potatoes is provided downstream of the sweet potato discharge and conveying device 40. Furthermore, a component (chute) 53 is provided downstream of the sweet potato discharge and conveying device 40 in this embodiment for sliding the sweet potatoes into the collection container 50.

[0042] The sweet potato collection container 50 is made up of a metal (for example, stainless steel) housing 51. The sweet potato collection container 50 has an opening (recess, storage space) 52 for collecting sweet potatoes, where sweet potatoes flowing from the belt conveyor 41 can be collected. A basket for collecting sweet potatoes can be placed in the sweet potato collection opening (recess) 52. In other words, the collection container 50 has a storage space 52 in which a storage basket capable of storing sweet potatoes is placed. The collection container 50 is also provided with a storage basket transport device 55 for moving the storage basket. To further explain, a belt conveyor 55 can be installed in the sweet potato collection container 50, and the sweet potatoes (or baskets containing sweet potatoes) can be lifted up by the belt conveyor 55.

[0043] As shown in FIG. 7, each of the plurality of brush rollers 60 includes a brush rotation shaft 61 and a contact brush 63. The brush rotation shaft 61 extends from the upstream to the downstream of the processing apparatus 100 (or the sterilization and washing apparatus 30) of the present embodiment. The brush rotation shafts 61 are arranged in the lateral direction. A plurality of contact brushes 63 are provided on one brush rotation shaft 61 from the upstream to the downstream. Note that a long contact brush 63 may be provided on one brush rotation shaft 61 from the upstream to the downstream. The plurality of brush rollers 60 are arranged so as to be curved as a whole. In other words, the plurality of brush rollers 60 are not arranged flat when viewed from the discharge port (downstream opening) 72 side, but are arranged so as to form a depression (like a mortar bowl, with both lateral ends being higher). The bending arrangement angle (θ2) of the plurality of brush rollers 60 is, for example, 5° to 25° (in one example, 10° (±5°) to 20° (±5°)) based on the horizontal line H (and the dotted line 69 of the arrangement of the center points of the rotation shafts 61), but it can be a variable curve instead of a constant-angle curve. Therefore, this bending arrangement angle (θ2) is not limited, and an appropriate one can be adopted according to the conditions of the processing apparatus 100. Further, in the configuration example of the present embodiment, the end of the brush rotation shaft 61 is supported by a rotation shaft fixing member 62 (a fixing member located at the upstream or downstream end) so as to be rotatable. This fixing member 62 is formed in accordance with the structure / shape (θ2) of the curved arrangement of the plurality of brush rollers 60.

[0044] In the configuration of the present embodiment, an injection device 65 for injecting washing water is provided above the inside of the sterilization and washing apparatus 30. The washing water of the present embodiment is washing water containing ozone water. In the injection device 65 of the present embodiment, a plurality of injection ports 66 are arranged from the upstream to the downstream. Specifically, a plurality of injection ports 66 are provided above the plurality of brush rollers 60. In the injection device 65, the injection ports 66 are provided on a water distribution pipe 67 extending from the upstream to the downstream. Specifically, a plurality of injection ports 66 are provided on one water distribution pipe (washing water distribution pipe) 67, and a plurality of such water distribution pipes 67 are provided in the sterilization and washing apparatus 30.

[0045] In this embodiment, the sterilization and cleaning device 30 is provided with multiple cleaning water pipes 67. In the illustrated configuration, the multiple spray nozzles 66 are arranged symmetrically with respect to a center line extending from upstream to downstream in the sterilization and cleaning device 30. This allows cleaning water (including ozonated water) to be uniformly sprayed onto the sweet potatoes flowing through the sterilization and cleaning device 30 (sweet potatoes flowing from upstream to downstream), ensuring that each sweet potato is thoroughly cleaned and sterilized. While the arrangement does not necessarily have to be symmetrical as long as the cleaning water can be sprayed uniformly onto the sweet potatoes, a symmetrical arrangement allows for more efficient and uniform spraying of the cleaning water.

[0046] Next, with reference to Figures 8(a) and (b), the curved arrangement of the multiple brush rollers 60 in the sterilization and cleaning apparatus of this embodiment will be described. In the apparatus (130, 30) shown in Figures 8(a) and (b), a multiple brush roller 60 (or brush rotation shaft 61) (for example, three or more; in one example, five to fifteen (or more)) is provided on one side away from the center line (c) (for example, the right side), and a multiple brush roller 60 (or brush rotation shaft 61) (for example, three or more; in one example, five to fifteen (or more)) is provided on the other side away from the center line (c) (for example, the left side). The multiple brush rollers 60 are arranged so as to be curved in a concave shape overall, and the arrangement surface of the multiple brush rollers 60 arranged in a concave shape is inclined to descend along the direction of flow from upstream to downstream (for example, see θ1 in Figure 2).

[0047] Figure 8(a) shows a configuration where the curvature of the multiple brush rollers 60 is steep (130). On the other hand, Figure 8(b) shows a configuration where the curvature of the multiple brush rollers 60 is gentle (30). In the case of the sterilization and washing device 130 shown in Figure 8(a), the steep curvature causes the sweet potatoes 200 to tend to gather in the center (see arrow 131). On the other hand, in the case of the sterilization and washing device 30 shown in Figure 8(b), the gentle curvature causes the sweet potatoes 200 to be dispersed not only in the center but also to the outside (see arrow 135). Compared to the state shown in Figure 8(a), the state shown in Figure 8(b) allows for better washing (sterilization) of the sweet potatoes 200. Therefore, the curved arrangement of the sterilization and washing device 30 should be gentle, taking into account other conditions (for example, the angle (θ) of the curved arrangement should be between 5° and 25° (in one example, 10° (±5°) to 20° (±5°))). Note that whether the sweet potatoes 200 are properly dispersed depends on the rotation speed of the multiple brush rollers 60 and the size and number of sweet potatoes 200, and is not determined solely by the angle (θ2) of the curved arrangement. In addition, as shown in Figure 8(b), the sweet potatoes 200 can be properly dispersed even if the central part is made almost flat and the curvature of the peripheral part is stronger.

[0048] Further, since the sweet potatoes 200 tend to gather at the center due to gravity as shown in FIG. 8(a), as shown in FIG. 8(b), at least one (one or more) brush rollers 60a in the rotational direction for the sweet potatoes 200 to move outward may be provided. In other words, in the plurality of brush rollers 60, a configuration may be adopted in which at least one (one or more) brush roller 60a having a brush rotation shaft 61 for rotating the sweet potatoes 200 in a direction away from the center line of the sterilization and washing device 30 is provided based on the center line (C) flowing from upstream to downstream. Then, in order to appropriately disperse and spread the sweet potatoes 200 (in the lateral direction), it may be configured to include both a brush roller 60 having a brush rotation shaft 61 that rotates in the clockwise direction and a brush roller 60 having a brush rotation shaft that rotates in the counterclockwise direction. Furthermore, taking into account the tendency of the sweet potatoes 200 to gather at the center due to gravity, at least half or more (for example, almost all (70 - 80%), or all (100%)) of the brush rollers 60a in the rotational direction for the sweet potatoes 200 to move outward may be provided. In other words, based on the center line (C) flowing from upstream to downstream, a brush roller 60a having a brush rotation shaft 61 for rotating the sweet potatoes 200 in a direction away from the center line (the middle as viewed from the lateral direction) of the sterilization and washing device 30 may be provided in at least half or more (for example, almost all (70 - 80%), or all (100%)) of the plurality of brush rollers 60.

[0049] Furthermore, as shown in Figure 2, the sterilization and cleaning device 30 of this embodiment is tilted downward (downstream is downward) so that the sweet potatoes (200) flow from upstream to downstream by gravity. Specifically, the arrangement surface (upper surface of the brushes) 39 of the multiple brush rollers 60 inside the sterilization and cleaning device 30 is tilted (θ1) downward along the direction of flow from upstream to downstream. Specifically, the angle θ1 formed by the arrangement surface (upper surface of the brushes) 39 of the multiple brush rollers 60 and the horizontal line H is tilted downward toward the downstream. The angle θ1 can be, for example, 2° to 15° (5° to 10° in one example), but it is preferable to determine an appropriate angle (θ1) depending on the dimensions of the sterilization and cleaning device 30, the shape and rotation speed of the multiple brush rollers 60, and the size and number of sweet potatoes 200. In addition, a mechanism (height adjustment of a base, etc.) can be provided to adjust the angle (θ1) of the sterilization and cleaning device 30 so that an appropriate angle (θ1) can be obtained.

[0050] Figure 9 schematically shows, from above, how multiple brush rollers 60 are arranged in the sterilization and cleaning device 30 of this embodiment. In the configuration of this embodiment, contact brushes 63 can be uniformly arranged on a single brush rotation shaft 61 and placed in parallel, but other modifications are possible. The configuration shown in Figure 9 shows an example in which the contact brushes 63 are arranged in a grid pattern. In the example shown in Figure 9, there is a possibility that sweet potatoes (200) may fall between the contact brushes 63, so the brush rotation shafts 61 on both sides of the single brush rotation shaft 61 may be moved closer together so that the contact brushes 63 are denser, preventing the sweet potatoes (200) from falling and allowing them to move from upstream to downstream. Alternatively, a configuration may be made in which a second contact brush (a contact brush with a smaller diameter than the diameter of the first contact brush) is placed on the brush rotation shaft 61 between the contact brushes 63 (first contact brushes) on a single brush rotation shaft 61. With such a configuration, the contact brushes 63 become densely packed, preventing the sweet potatoes (200) from falling and allowing them to move from upstream to downstream. Furthermore, in this configuration, the brush rotation shafts 61 on both sides of a single brush rotation shaft 61 may be brought closer together to make the contact brushes 63 even denser. Compared to a configuration in which the contact brushes 63 are uniformly distributed on a single brush rotation shaft 61, the configuration in which the contact brushes 63 are arranged in a grid pattern has the advantage that the sweet potatoes (200) can be moved in a zigzag pattern, allowing for more effective sterilization and cleaning of the sweet potatoes (200). An example of a configuration in which the first contact brushes 63 and the second contact brushes 63 are placed side by side is shown in Figure 17, which will be described later.

[0051] Next, the sweet potato processing method of this embodiment will be described with reference to Figure 10. Figure 10 is a flowchart illustrating the sweet potato processing method of this embodiment. Figure 11 is a schematic top view showing the configuration of the sweet potato processing apparatus 100 of this embodiment. Figure 12 is a schematic side view showing the configuration of the sweet potato processing apparatus 100. Furthermore, Figure 13 is a schematic side view showing the configuration of the sweet potato introduction and conveying device 20. Finally, Figure 14 is a schematic diagram showing the collection container 50 in the sweet potato processing apparatus 100.

[0052] As shown in Figure 10, first, the sweet potatoes are cured (step S100). Sweet potato curing is a process that prevents spoilage by forming a cork layer on the wounds of sweet potatoes that have been damaged during harvesting or other times, under high temperature and high humidity conditions. Figure 14 shows the state of the sweet potato 200, specifically showing that a cork layer 210 has been formed on a part of the surface 201 of the sweet potato by curing.

[0053] In the curing process (step S100) of this embodiment, prior to storage, the temperature is raised to 30-35°C and the humidity to 90-95% for 4-5 days to promote the formation of a cork layer 210 (plant protective layer) on the surface layer 201 of the sweet potato. After the wounds have closed, the sweet potatoes are stored at a temperature of 13-14°C and a humidity of 85-90%. Although the optimal storage temperature for sweet potatoes is 13-14°C, if they are stored at this temperature from the beginning, black rot and soft rot fungi will enter through the wounds made during harvest, causing many sweet potatoes to rot. Curing is performed to prevent this. Furthermore, in the processing of this embodiment, the sweet potatoes are stored in air containing ozone, rather than in ordinary air. Sweet potatoes are stored in warehouses at the optimal storage temperature of 13-14°C for long-term storage (for example, several months to a year). However, at 13-14°C, bacteria and molds become active, albeit slowly, and a certain percentage of the sweet potatoes will spoil (for example, about 15% will be discarded due to spoilage). Storing them in air containing ozone can prevent spoilage due to its sterilizing effect, thus reducing waste. Furthermore, 13-14°C is the temperature at which sweet potatoes mature and become sweeter; therefore, sweet potatoes taste better after being stored in a warehouse at the optimal temperature than immediately after harvest.

[0054] Ozone (O3), used to prevent spoilage, is a molecule composed of three oxygen atoms. Because the extra oxygen atom in ozone (O3) makes it more unstable than an oxygen molecule (O2), it exhibits a strong bactericidal effect. Specifically, the oxygen atoms produced by ozone (O3) oxidize and decompose the cell walls and membranes of bacteria, as well as the protein coats of viruses, thereby killing bacteria and inactivating viruses. Furthermore, because it dissolves nucleic acids (DNA, RNA), which are cellular components, it prevents the development of genetically altered, resistant strains. In addition, ozone-based sterilization and virus inactivation are rapid and do not produce new toxic substances. This ozone-based sterilization is harmless to the environment and human health, and there are no concerns about pesticide residues.

[0055] In this embodiment, the curing process (step S100) involves storing the sweet potatoes in ozone-containing air at a constant temperature (13-14°C) for a long period (for example, several months to a year) to prevent spoilage and promote maturation, thereby increasing sweetness. In the ozone atmosphere storage during the curing process (step S100), the ozone concentration is, for example, 0.5 ppm to 1 ppm, but is not limited to this as long as spoilage can be prevented. The processing apparatus 100 of this embodiment is equipped with a sweet potato storage section (container, warehouse, etc.) for storing sweet potatoes in an ozone atmosphere.

[0056] Next, sweet potatoes 200 are introduced into the sweet potato processing apparatus 100 of this embodiment (step S120). Specifically, as shown in Figures 11 and 12, the sweet potatoes (200) after curing (step S100) are introduced into the sweet potato input section 10 (11) of the sweet potato processing apparatus 100. In this embodiment, the sweet potatoes (200) are taken out of the sweet potato storage section where the sweet potatoes are stored in an ozone atmosphere and introduced into the sweet potato processing apparatus 100 (particularly the sweet potato input section 10 (11)). The sweet potatoes (200) introduced into the sweet potato input section 10 (11) are transported by the sweet potato introduction and conveying device 20 (belt conveyor 21) and introduced into the sterilization and washing device 30. Furthermore, the belt conveyor 21 that transported the sweet potatoes (200) to the sterilization and washing device 30 returns to the sweet potato input section 10 by turning back on a roller, as shown in Figure 13, and passing under the upper belt conveyor 21 (continuous track). Figure 16 shows how the sweet potatoes 200 are transported by the belt conveyor 21.

[0057] Next, the sterilization and cleaning device 30 sterilizes and cleans the sweet potatoes 200 (step S140). Specifically, as shown in Figure 7, the sweet potatoes (200) are moved from upstream to downstream while rotating a plurality of brush rollers 60, and cleaning water (cleaning water containing ozonated water) is sprayed from the spraying device 65 to sterilize and clean using the function of the ozonated water. In this embodiment, ozonated water (cleaning water containing ozonated water) is produced by adding ozone generated by an ozone generator (not shown) to water (tap water, well water) and supplied to the cleaning water piping 67. Then, ozonated water (cleaning water containing ozonated water) is discharged from the spraying device 65 (spray nozzle 66) connected to the cleaning water piping 67 and applied to the sweet potatoes 200 in a way that it rains down on them. The ozone concentration of the cleaning water (cleaning water containing ozonated water) in this embodiment is, for example, 0.4 mg / liter to 0.8 mg / liter, but it is not limited to this value as long as sterilization can be performed appropriately. Figure 17 shows how the sweet potato 200 moves downstream while being rotated by multiple brush rollers 60.

[0058] Next, the sterilized and washed sweet potatoes 200 are discharged from the sterilization and washing device 30 (step S160). Specifically, as shown in Figure 18, the sweet potatoes 200 are transported by a belt conveyor 41 (sweet potato discharge and transport device 40). Then, the sweet potatoes 200 are collected (step S180). In Figure 18, a collection basket 59 is placed in the sweet potato collection container 50, and the sweet potatoes 200 are collected in the collection basket 59. This collection basket 59 can be moved (raised and lowered) to a display stand 56 by a belt conveyor 55, as shown in Figure 13.

[0059] Sweet potatoes 200 processed by the processing method of this embodiment can be transported for a long period of time (for example, 1 to 2 months) without chemicals, provided they are stored at a constant temperature (13°C (or 13°C to 14°C)). This allows them to be transported to overseas locations (such as Southeast Asia (e.g., Singapore), North America (e.g., the United States, Canada)) where they could not be transported or sold before due to spoilage, thus opening up new sales channels. According to the technology (processing apparatus, processing method) of the embodiment of the present invention, the sterilization and washing apparatus 30 for sterilizing and washing the sweet potatoes 200 is equipped with a plurality of brush rollers 60 and a spraying apparatus 65 that sprays washing water containing ozonated water. The sweet potatoes 200 can be moved downstream while rotating while ozonated water is being sprayed, and as a result, the sweet potatoes 200 can be sterilized and stored for a long period of time.

[0060] Furthermore, with the processing apparatus 100 of this embodiment, once sweet potatoes are placed in the upstream sweet potato input section 10 (11), they pass through the sterilization and washing device 30 and move (without interruption) directly to the downstream sweet potato discharge and conveying device 40 (41), where they can then be collected in the sweet potato collection container 50. This allows for continuous processing and thus offers excellent work efficiency. For example, using the processing apparatus 100 of this embodiment, it is possible to process, for instance, 3 to 4 tons per day (approximately 8 hours).

[0061] The sweet potatoes 200 processed in this manner can be subjected to heat treatment (step S200). Specifically, the sweet potatoes 200 can be baked to make roasted sweet potatoes, or steamed to make steamed sweet potatoes, thereby producing cooked sweet potatoes. The cooked sweet potatoes produced by the processing method of this embodiment are very delicious because the curing (preservation) step (S100) has further matured the sweet potatoes, increasing their sweetness. Furthermore, since ozone (ozone atmosphere, ozonated water) is used for sterilization, it is harmless to the human body and also environmentally friendly.

[0062] Although the present invention has been described above with reference to preferred embodiments, this description is not limiting, and various modifications are, of course, possible. For example, the injection devices 65 in this embodiment are arranged in the direction of moving from upstream to downstream, but they may also be arranged in a direction perpendicular to that (lateral direction), or arranged to be evenly distributed in a planar manner. Also, although a belt conveyor has been mainly described as the conveying device, other conveying devices can be used as long as they can perform the operation of this embodiment. In addition, although an example of processing sweet potatoes 200 that have been cured and / or preserved has been described, it is also possible to process sweet potatoes 200 that have not undergone such treatment with the processing device 100 of this embodiment. Furthermore, it should be added that the elements of the above-described embodiments can be combined as appropriate, as long as they do not contradict each other, and should not be interpreted as limiting.

[0063] According to the present invention, it is possible to provide a processing apparatus and processing method that can sterilize sweet potatoes and preserve them for a long period of time.

[0064] 10 Sweet potato input section 11 Sweet potato input port (input plate, inclined plate) 12 Placement platform 20 Sweet potato introduction and conveying device 21 Belt conveyor 30 Sterilization and washing device 31 Housing section 32 Roof section 39 Arrangement surface (brush top surface) 40 Sweet potato discharge device 41 Belt conveyor 50 Sweet potato collection container 51 Housing section 52 Sweet potato storage space 55 Storage basket conveying device (belt conveyor) 56 Placement platform 59 Collection basket 60 Brush roller 61 Brush rotation shaft 62 Rotation shaft fixing member 63 Contact brush 65 Spray device 66 Spray nozzle 67 Water distribution pipe (washing water piping) 71 Inlet (upstream opening) 72 Outlet (downstream opening) 100 Sweet potato processing device 200 Sweet potato 210 Cork layer

Claims

1. A processing apparatus for sweet potatoes, comprising: a sterilization and washing apparatus for sterilizing and washing sweet potatoes; an introduction and conveying apparatus for introducing sweet potatoes into the sterilization and washing apparatus; and a sweet potato discharge apparatus for moving the sweet potatoes processed by the sterilization and washing apparatus downstream, wherein the sterilization and washing apparatus is provided with a plurality of brush rollers for rotating the sweet potatoes while moving them downstream, and a spraying apparatus for spraying washing water containing ozonated water toward the plurality of brush rollers.

2. The processing apparatus according to claim 1, wherein each of the plurality of brush rollers is composed of a brush rotation shaft and a contact brush, and with respect to a center line flowing from upstream to downstream in the sterilization and cleaning apparatus, a plurality of brush rotation shafts are provided on one side away from the center line, and a plurality of brush rotation shafts are provided on the other side away from the center line, and the plurality of brush rollers are arranged so as to be generally concave, and the arrangement surface of the plurality of brush rollers arranged so as to be concave is inclined to descend along the direction of flow from upstream to downstream.

3. The processing apparatus according to claim 1, wherein each of the plurality of brush rollers is composed of a brush rotation shaft and a contact brush, a plurality of contact brushes are provided on one brush rotation shaft from upstream to downstream of the processing apparatus, the plurality of brush rollers are arranged so as to be curved in a concave shape overall, the spraying device has a plurality of spray nozzles arranged from upstream to downstream of the processing apparatus, and the plurality of spray nozzles are provided above the plurality of brush rollers.

4. The processing apparatus according to claim 3, wherein the plurality of brush rollers include both a brush rotation axis that rotates clockwise and a brush rotation axis that rotates counterclockwise.

5. The processing apparatus according to claim 3, wherein the plurality of brush rollers include at least one brush roller having a brush rotation axis that rotates the sweet potato in a direction away from the center line of the sterilization and washing apparatus, with reference to the center line through which the sweet potato flows from upstream to downstream in the sterilization and washing apparatus.

6. The processing apparatus according to claim 3, wherein the plurality of brush rollers are composed of brush rollers equipped with brush rotation axes that rotate the sweet potatoes in a direction away from the center line of the sterilization and washing apparatus, with reference to the center line through which the sterilization and washing apparatus flows from upstream to downstream.

7. The processing apparatus according to claim 3, wherein, in a configuration in which the plurality of brush rollers are arranged, the contact brushes are arranged in a grid pattern.

8. The processing apparatus according to any one of claims 2 to 7, wherein, in a configuration in which a plurality of brush rollers are arranged, a first contact brush and a second contact brush having a smaller diameter than the diameter of the first contact brush are alternately arranged on the brush rotation axis.

9. The processing apparatus according to any one of claims 3 to 7, wherein the arrangement surfaces of the plurality of brush rollers in the sterilization and cleaning apparatus are inclined to descend along the direction of flow from upstream to downstream.

10. The processing apparatus according to any one of claims 1 to 7, wherein the spraying device is provided with a washing water pipe to which the plurality of spray nozzles are attached, the sterilization and washing apparatus is provided with a plurality of washing water pipes, and the plurality of spray nozzles are arranged in the sterilization and washing apparatus so as to be symmetrical with respect to a center line extending from upstream to downstream of the processing apparatus.

11. A processing apparatus according to any one of claims 1 to 7, wherein a sweet potato discharge device for discharging the sweet potatoes is provided downstream of the sterilization and washing device, and a collection container for collecting the sweet potatoes is provided downstream of the sweet potato discharge device.

12. The processing apparatus according to claim 11, wherein the collection container has a storage space in which a storage basket capable of storing the sweet potatoes is arranged, and the collection container is provided with a storage basket transport device for moving the storage basket.

13. The processing apparatus according to any one of claims 1 to 7, wherein the sterilization and washing apparatus is connected to an ozone water generator that generates ozonated water, an input port for introducing sweet potatoes is provided on the upstream side of the introduction and conveying apparatus, and the processing apparatus is configured such that the sweet potatoes placed on the introduction and conveying apparatus move continuously from the upstream to the downstream side of the processing apparatus and are discharged from the sweet potato discharge apparatus.

14. The processing apparatus according to any one of claims 1 to 7, further comprising a sweet potato storage section for storing sweet potatoes in an ozone atmosphere, wherein the sweet potatoes stored in the sweet potato storage section are supplied to the introduction conveying device and introduced to the sterilization and washing device.

15. A method for processing sweet potatoes, comprising: an introduction step of introducing sweet potatoes into a sterilization and washing device for sterilizing and washing sweet potatoes; a sterilization and washing step of sterilizing and washing the sweet potatoes in the sterilization and washing device; and a discharge step of discharging the sweet potatoes from the sterilization and washing device, wherein the sterilization and washing step involves rotating the sweet potatoes with a plurality of brush rollers, moving them downstream within the sterilization and washing device, and spraying ozonated water to wash and sterilize the sweet potatoes.

16. The processing method according to claim 15, wherein each of the plurality of brush rollers is composed of a brush rotation shaft and a contact brush, and with respect to a center line flowing from upstream to downstream in the sterilization and cleaning device, a plurality of brush rotation shafts are provided on one side away from the center line, and a plurality of brush rotation shafts are provided on the other side away from the center line, and the plurality of brush rollers are arranged so as to be generally concave, and the arrangement surface of the plurality of brush rollers arranged so as to be concave is inclined to descend along the direction of flow from upstream to downstream.

17. The processing method according to claim 16, wherein a plurality of contact brushes are provided on a single brush rotation shaft, extending from upstream to downstream of the sterilization and cleaning device, a spraying device for spraying cleaning water containing ozonated water has a plurality of spray nozzles arranged from upstream to downstream of the sterilization and cleaning device, the plurality of spray nozzles are provided above the plurality of brush rollers, and in the sterilization and cleaning step, the sweet potatoes move towards the upstream or downstream of the sterilization and cleaning device, scattering laterally over the plurality of brush rollers which are arranged to be curved in an overall concave shape.

18. The processing method according to any one of claims 15 to 17, in a configuration in which a plurality of brush rollers are arranged, wherein the contact brushes are arranged in a grid pattern, and a first contact brush and a second contact brush having a smaller diameter than the diameter of the first contact brush are alternately arranged on the brush rotation axis, and the sweet potato moves from upstream to downstream on the plurality of brush rollers.

19. The processing method according to any one of claims 15 to 17, wherein the sweet potatoes are introduced into the sterilization and washing device using an introduction and conveying device, and the sweet potatoes supplied to the introduction and conveying device are cured.

20. The processing method according to claim 19, wherein the sweet potatoes that have undergone the curing process are stored in an ozone atmosphere.

21. The processing method according to any one of claims 15 to 17, further comprising the step of making baked sweet potatoes by heating the sweet potatoes that have undergone the sterilization and washing step.

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