A vacuum belt drying apparatus for agricultural products

Abstract

The present application relates to the technical field of agricultural product drying, and specifically relates to a vacuum belt drying device for agricultural products, which comprises a shell, a heat source, a rack, an annular mesh belt and multiple material collecting parts. The heat source is used for feeding air with a preset temperature into the shell. The rack is arranged in the shell. The annular mesh belt is arranged on the rack and forms a closed conveying loop on the rack. The number of the annular mesh belts is multiple. The multiple annular mesh belts are arranged in parallel and in a vertical direction, and have a consistent material conveying direction. Except for the lowermost annular mesh belt, the other annular mesh belts are used for receiving agricultural products. The multiple rake parts are arranged on the rack and above the annular mesh belts respectively, and are used for uniformly dispersing the agricultural products on the annular mesh belts and drawing multiple grooves on the agricultural products on the annular mesh belts. Except for the lowermost rake part, the other rake parts are also used for pushing the excess agricultural products on the annular mesh belts to the lowermost annular mesh belt. Thus, the uniformity of drying is ensured.

Description

Technical Field

[0001] This invention relates to the field of agricultural product drying technology, and in particular to a vacuum belt drying device for agricultural products. Background Technology

[0002] Agricultural products typically contain high moisture content after harvest, which not only makes them prone to mold and rot during storage, but also increases weight and losses during transportation. Therefore, drying agricultural products is a key step in ensuring their quality and facilitating storage and transportation.

[0003] The drying process of agricultural products requires specialized drying equipment, such as box dryers, rotary drum dryers, and mesh belt dryers. Among these, mesh belt dryers are widely used in the agricultural product processing field due to their advantages, including strong continuous operation capability, good material spreading uniformity, ease of automation control, and adaptability to the drying needs of various agricultural products.

[0004] In related technologies, such as Chinese patent CN218936947U, a multi-layer mesh belt agricultural product drying equipment is disclosed. By adding a sweeping rake to the multi-layer mesh belt dryer and using the combination of the sweeping rake and hot air, the problem of uneven drying of agricultural products is solved, and the uniform dispersion and efficient drying of materials are achieved.

[0005] However, in the process of drying agricultural products, the hot air is difficult to circulate from bottom to top in the above-mentioned multi-layer mesh belt agricultural product drying equipment, resulting in the lower layer of agricultural products being dried more thoroughly than the upper layer of agricultural products, which ultimately affects the uniformity of drying. Summary of the Invention

[0006] Therefore, it is necessary to provide a vacuum belt drying device for agricultural products to address the problem of uneven drying in the current agricultural product drying process.

[0007] The above objectives are achieved through the following technical solutions: A vacuum belt drying device for agricultural products, the vacuum belt drying device for agricultural products comprising: shell; A heat source is configured to allow air at a preset temperature to be introduced into the housing from the bottom. The frame is housed within the outer casing; A ring-shaped mesh belt is installed on the frame and forms a closed conveying loop on the frame; there are multiple ring-shaped mesh belts, which are arranged in parallel and vertically, and the conveying direction is the same; except for the bottommost ring-shaped mesh belt, the other ring-shaped mesh belts are configured to receive agricultural products. Multiple raking sections are mounted on the frame and positioned above the annular mesh belt. Each section is configured to both evenly distribute the agricultural products on the annular mesh belt and create multiple grooves on the agricultural products. Except for the lowest raking section, the other raking sections are also configured to move excess agricultural products from the annular mesh belt to the lowest section of the annular mesh belt.

[0008] Furthermore, the raking section has two rakes, which are horizontally arranged and together form a V-shaped structure. Each rake has multiple rake teeth at its bottom, and these teeth are spaced apart along the extension direction of the rake. The closing direction of the two rakes in the lowermost raking section is opposite to the conveying direction of the lowermost annular mesh belt, while the closing direction of the two rakes in the other raking sections is consistent with the conveying direction of the annular mesh belt.

[0009] Furthermore, the vacuum belt drying equipment also includes multiple storage hoppers, each mounted on the frame and configured to store agricultural products. Each hopper has a discharge port at its bottom. The storage hoppers are located above the annular mesh belts (excluding the lowest one), and the agricultural products can be transported to these belts via their respective discharge ports. The vacuum belt drying equipment also includes an adjustment component, configured to adjust the size of the discharge port according to the quantity of agricultural products transported on the lowest annular mesh belt; the larger the quantity of agricultural products, the smaller the discharge port.

[0010] Furthermore, the lowest rake section also has a support shaft, which is vertically arranged. The two rake rods of the lowest rake section are respectively rotatably sleeved on the support shaft and can both slide elastically in the vertical direction. The adjustment assembly includes an adjustment ring, a bracket, and multiple baffles. The adjustment ring is fixedly sleeved on the support shaft and has a sloping top. The bottom of the two rake rods of the lowest rake section is provided with a sliding rod, which slides and stops at the top of the adjustment ring. The baffle is located at the discharge port and is configured to block the discharge port. The bracket connects the multiple baffles into one unit and can slide elastically in the vertical direction. At least one rake rod of the lowest rake section is provided with a top rod, which forms a sliding stop with the bracket.

[0011] Furthermore, an elastic element is connected between the support shaft and the two rakes of the lowermost rake section. Under the action of the elastic element, the two rakes of the lowermost rake section tend to move downward.

[0012] Furthermore, the elastic element is a first compression spring, which is sleeved on the support shaft.

[0013] Furthermore, from top to bottom, the included angle between the two rakes of the rake section gradually decreases.

[0014] Furthermore, the bandwidth of the lowest ring mesh is greater than the bandwidth of the other ring meshes.

[0015] Furthermore, all of the annular mesh belts have the same bandwidth; the frame is also provided with two guide plates, which are located on both sides of the bandwidth direction of the lowest annular mesh belt, and the plate surfaces are inclined and form a figure-eight structure, with the large openings of the two guide plates facing upwards.

[0016] Furthermore, a negative pressure setting is provided inside the outer casing.

[0017] The beneficial effects of this invention are: This invention relates to a vacuum belt drying device for agricultural products. By setting up an annular mesh belt and a corresponding rake section, the rake section disperses the agricultural products during drying, ensuring uniform distribution of the products on the current layer of the annular mesh belt, thereby ensuring uniform drying of the current layer of agricultural products. Simultaneously, the rake section can move excess agricultural products from the other annular mesh belts (excluding the bottommost one) to the bottommost annular mesh belt, further ensuring uniform distribution of the agricultural products on the current layer of the annular mesh belt, and thus further ensuring uniform drying of the current layer of agricultural products. Furthermore, the rake section can create multiple grooves on the agricultural products on the annular mesh belt, allowing hot air to more easily pass through these grooves to reach the upper layers of agricultural products, thereby ensuring uniform heat distribution and achieving uniform drying of agricultural products across different layers.

[0018] Furthermore, by setting up adjustment components, the size of the discharge port can be adjusted according to the quantity of agricultural products conveyed on the bottom ring mesh belt, ensuring that the feeding speed and drying speed are matched, and avoiding the problems of over-drying a small amount and under-drying a large amount.

[0019] Furthermore, by setting the angle between the two rakes of the rake section to gradually decrease from top to bottom, on the one hand, the number of grooves carved on the agricultural products on the annular mesh belt increases sequentially from top to bottom, thereby increasing the efficiency of hot air passage from top to bottom and further ensuring the on-demand distribution of hot air; on the other hand, the position of the agricultural products falling on the annular mesh belt from top to bottom is delayed sequentially, so that the agricultural products on the upper annular mesh belt have a longer drying path on the lower annular mesh belt, ensuring that the degree of drying of agricultural products falling from different layers of annular mesh belts to the lower annular mesh belt tends to be consistent. Attached Figure Description

[0020] Figure 1 A three-dimensional structural schematic diagram of a vacuum belt drying device for agricultural products provided in an embodiment of the present invention; Figure 2 A three-dimensional structural schematic diagram of a vacuum belt drying device for removing the outer shell of agricultural products provided in an embodiment of the present invention; Figure 3 A top view of a vacuum belt drying device for removing the outer shell of agricultural products provided in an embodiment of the present invention; Figure 4 This is a front view structural diagram of a vacuum belt drying device for agricultural products with their outer shells removed, provided in an embodiment of the present invention. Figure 5 for Figure 4 Sectional view along the AA direction; Figure 6 for Figure 4 Sectional view along the BB direction; Figure 7 for Figure 4 A magnified schematic diagram of the structure at point Z in the middle; Figure 8 A three-dimensional structural diagram of the raking section and adjusting components of the vacuum belt dryer for agricultural products provided in an embodiment of the present invention during assembly; Figure 9 This is a front view of the assembly of the rake section and adjustment components of the vacuum belt dryer for agricultural products provided in an embodiment of the present invention. Figure 10 for Figure 9 Cross-sectional view along the CC direction.

[0021] in: 1. Outer shell; 2. Frame; 201. Guide plate; 3. Rake section; 301. Support rod; 302. Support base; 303. Rake rod; 3031. Rotating seat; 304. Rake teeth; 305. Support shaft; 3051. Stop; 306. First compression spring; 307. Slide rod; 308. Top rod; 4. Circular mesh belt; 5. Storage hopper; 501. Discharge port; 601. Adjusting ring; 602. Bracket; 603. Baffle; 604. Second compression spring. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0023] The component designations used in this document, such as "first" and "second," are merely for distinguishing the described objects and do not have any sequential or technical meaning. The terms "connection" and "linkage," unless otherwise specified, include both direct and indirect connections (linkages). In the description of this invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description. They 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, and therefore should not be construed as limiting the invention.

[0024] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0025] The following reference Figures 1 to 10 The present invention describes a vacuum belt drying device for agricultural products, which is particularly suitable for drying agricultural products, and of course, it is also suitable for drying other materials.

[0026] Specifically, the vacuum belt dryer for agricultural products is configured as follows: A shell 1 is installed inside the shell 1; a frame 2 is installed inside the shell 1; a rake section 3 and multiple annular mesh belts 4 are installed on the frame 2, with the multiple annular mesh belts 4 extending horizontally in the front-to-back direction to ensure they are parallel to each other and arranged vertically, forming a closed conveying loop on the frame 2; the rake section 3 is located above the uppermost annular mesh belt 4 and can evenly distribute the agricultural products on the uppermost annular mesh belt 4. The agricultural products are placed on top of the annular mesh belts 4 during drying. Exemplarily, three annular mesh belts 4 can be installed.

[0027] To facilitate the supply of heat for drying agricultural products, the vacuum belt dryer for agricultural products is configured to also include a heat source. The heat source is configured to introduce air at a preset temperature into the outer casing 1 from the bottom, allowing the air at the preset temperature to move upwards within the outer casing 1 while drying the agricultural products. Exemplarily, the heat source can be a hot air blower, with its exhaust end connected to the outside and its exhaust end connected to the bottom of the outer casing 1, allowing air at the preset temperature to be introduced into the outer casing 1 from the bottom.

[0028] To facilitate the driving force for the operation of the annular mesh belt 4, the vacuum belt dryer for agricultural products is also configured to include a drive mechanism. This drive mechanism comprises multiple drive components, the number of which is equal to the number of annular mesh belts 4, ensuring that each annular mesh belt 4 can be driven independently. When there are three annular mesh belts 4, the number of drive components is correspondingly set to three. Taking one drive component as an example, the drive component can be configured to include a drive motor, a drive roller, a driven roller, a tension roller, and several support rollers, all mounted on the frame 2. All support rollers extend horizontally in the left-right direction and are located inside the annular mesh belt 4. They are all capable of rotating around their own axis. The driving roller and driven roller are located at the front and rear ends of the annular mesh belt 4, respectively, and are in frictional contact with the annular mesh belt 4. The tensioning roller and multiple support rollers are located between the driving roller and the driven roller, and are in frictional contact with the annular mesh belt 4. The tensioning roller is used to tension the annular mesh belt 4, and the support rollers are used to support the annular mesh belt 4. The motor shaft of the drive motor is coaxial with and fixedly connected to the driving roller, which enables the driving roller to rotate, thereby facilitating the rotation of the annular mesh belt 4 through the following motion of the driven roller.

[0029] During the drying process of agricultural products, the agricultural products are first placed on the uppermost annular mesh belt 4; then the drive motor is started, which drives the active roller to rotate; when the active roller rotates, it drives the annular mesh belt 4 to rotate through the follow-up of the driven roller, and synchronously moves the agricultural products; as the agricultural products move, under the action of the rake section 3, the agricultural products are evenly dispersed on the uppermost annular mesh belt 4, then move to the middle annular mesh belt 4, and then move synchronously with the middle annular mesh belt 4, and then move to the lowermost annular mesh belt 4, and then move synchronously with the lowermost annular mesh belt 4; at the same time, the hot air fan is started, and the hot air fan introduces air with a preset temperature into the outer shell 1 from the bottom of the outer shell 1. The air with the preset temperature moves from bottom to top inside the outer shell 1 while drying the agricultural products.

[0030] Although the above process can dry agricultural products, the hot air is difficult to circulate smoothly from bottom to top due to the obstruction effect of the multi-layer annular mesh belt 4. Agricultural products in the lower annular mesh belt 4 area can directly contact and absorb the heat of the hot air, while agricultural products in the upper annular mesh belt 4 area dry at a significantly faster rate than agricultural products in the upper layer due to insufficient hot air and low heat exchange efficiency. This ultimately affects the drying uniformity of the entire batch of agricultural products and makes it difficult to meet the process requirements for drying high-quality agricultural products.

[0031] Based on this, in the vacuum belt drying equipment for agricultural products provided in this embodiment of the invention, three annular mesh belts 4 are configured to transport materials from back to front, ensuring consistent conveying direction; the frame 2 is also equipped with multiple storage hoppers 5, each configured to store agricultural products, and each having a discharge port 501 at its bottom. The multiple storage hoppers 5 are located above the other annular mesh belts 4 except for the lowest one, and can respectively convey agricultural products to the other annular mesh belts 4 except for the lowest one through their discharge ports 501; when the annular mesh belts 4 are in operation... When there are three mesh belts 4, there are two corresponding storage hoppers 5, located above and behind the uppermost annular mesh belt 4 and the middle annular mesh belt 4, respectively. The top of each storage hopper 5 is open to facilitate the receipt and storage of agricultural products, and the front side wall is provided with a discharge port 501, so that agricultural products can be transported to the uppermost and middle annular mesh belts 4 through the discharge port 501, thereby enabling all annular mesh belts 4 except the lowermost annular mesh belt 4, i.e., the uppermost and middle annular mesh belts 4, to receive agricultural products.

[0032] The number of raking sections 3 is equal to the number of annular mesh belts 4, ensuring that agricultural products are evenly distributed on the annular mesh belts 4. Specifically, when there are three annular mesh belts 4, there are three raking sections 3. The three raking sections 3 are arranged vertically, with the uppermost raking section 3 located above and behind the uppermost annular mesh belt 4 and in front of the uppermost storage hopper 5, allowing it to evenly distribute agricultural products moving from the uppermost storage hopper 5 onto the uppermost annular mesh belt 4; the middle raking section 3 located above and behind the middle annular mesh belt 4 and in front of the middle storage hopper 5, allowing it to evenly distribute agricultural products moving from the middle storage hopper 5 onto the middle annular mesh belt 4; and the lowermost raking section 3 located above and behind the lowermost annular mesh belt 4, allowing it to evenly distribute agricultural products coming from the uppermost and middle annular mesh belts 4 onto the lowermost annular mesh belt 4.

[0033] More specifically, the raking section 3 has a support rod 301 that extends horizontally in the left-right direction. A support base 302 is provided in the middle of the support rod 301, and two rake rods 303 are provided on the support base 302. The two rake rods 303 of the same raking section 3 are horizontally arranged and together form a V-shaped structure. The closing direction of the two rake rods 303 of the middle and uppermost raking sections 3 is from back to front, so that it is consistent with the conveying direction of the annular mesh belt 4 in the middle and uppermost parts, ensuring that the agricultural products can be moved from the middle to the left and right sides during the movement of agricultural products, so as to achieve uniform lateral dispersion.

[0034] The rake section 3 can also create multiple grooves on the agricultural products on the annular mesh belt 4. The formation of these grooves breaks up the dense accumulation of the agricultural product layer, creating airflow channels that connect the lower and upper layers. The hot air, which was originally blocked by the dense structure of the agricultural product layer, can now pass through the lower agricultural product area more smoothly using these grooves as shortcuts, and then penetrate upwards to the space where the upper agricultural product is located. This effectively improves the distribution of hot air inside the outer shell 1, reduces the difference in the amount of hot air between the upper and lower layers, and allows agricultural products in different layers to fully contact and exchange heat with the hot air, ultimately achieving uniform drying of agricultural products in different layers.

[0035] Specifically, each rake bar 303 has multiple rake teeth 304 at its bottom. The multiple rake teeth 304 on the same rake bar 303 are arranged at intervals along the extension direction of the rake bar 303. The rake teeth 304 are rod-shaped structures, vertically arranged, and have a preset interval with the annular mesh belt 4, so that the arrangement of the rake teeth 304 can carve grooves on the surface of the agricultural products during the movement of the agricultural products.

[0036] In addition to the bottommost rake section 3, the other rake sections 3 are also configured to move excess agricultural products on the annular mesh belt 4 to the bottommost annular mesh belt 4, further ensuring that the agricultural products are evenly distributed on the current layer of annular mesh belt 4, and thus further ensuring the uniform drying of the current layer of agricultural products.

[0037] Specifically, the outer end of the rake 303 is located on the left or right side of the edge of the annular mesh belt 4, so that excess agricultural products on the middle and uppermost annular mesh belt 4 can be guided away from the current annular mesh belt 4; all annular mesh belts 4 have equal bandwidth; the frame 2 is also equipped with two guide plates 201, which are located on both sides of the bandwidth direction of the lowermost annular mesh belt 4, and are strip-shaped structures, both extending horizontally in the front-back direction. The cross-sectional shape of the guide plate 201 is V-shaped, and it has a horizontal part and an inclined part, wherein the inclined part is inclined, and the inner end of the inclined part is on the horizontal plane. The projections of the shadow and the bottommost annular mesh belt 4 on the horizontal plane coincide. The inclined portions of the two guide plates 201 form a figure-eight structure with the large opening of the figure-eight structure facing upwards. This allows the guide plates 201 to receive excess agricultural products that have detached from the middle and topmost annular mesh belts 4 and guide them to the bottommost annular mesh belt 4. The closing direction of the two rakes 303 of the bottommost rake section 3 is from front to back, which is opposite to the conveying direction of the bottommost annular mesh belt 4. This ensures that during the movement of agricultural products, they can be moved from the left and right sides towards the middle, achieving uniform lateral dispersion.

[0038] In a further embodiment, the dynamic matching of the feeding speed and the drying speed is the key to ensuring the uniformity of drying. If the feeding speed and the drying speed are out of balance, some agricultural products may stay in the shell 1 for too long and become over-dried, or stay for too short a time and become under-dried.

[0039] Based on this, the vacuum belt drying equipment for agricultural products provided in the embodiments of the present invention is configured to further include an adjustment component, which is configured to adjust the size of the discharge port 501 according to the quantity of agricultural products conveyed on the bottommost annular mesh belt 4, and the more agricultural products there are, the smaller the discharge port 501 becomes.

[0040] Therefore, when a large number of agricultural products are transported on the bottom ring mesh belt 4, it means that the load of agricultural products inside the outer shell 1 is large. If the original size of the discharge port 501 is maintained at this time, some agricultural products may be discharged before they are fully dried due to the excessive discharge rate, or the drying resources may be insufficient due to the relatively excessive supply. Therefore, the adjusting component will reduce the size of the discharge port 501 accordingly to reduce the discharge rate and reserve more drying time for the agricultural products inside the outer shell 1.

[0041] Specifically, the bottommost rake section 3 also has a support shaft 305, which is vertically arranged. The inner ends of the two rake rods 303 of the bottommost rake section 3 are each provided with a rotating seat 3031. The rotating seat 3031 has a ring structure. When the rake rods 303 are installed, they are rotated and sleeved on the support shaft 305 through the rotating seat 3031. The two rotating seats 3031 are arranged to abut against each other in the vertical direction to avoid interference.

[0042] Both rake rods 303 are capable of sliding elastically in the vertical direction. To facilitate the elastic sliding of the two rake rods 303 of the lowermost rake section 3, an elastic element is connected between the support shaft 305 and the two rake rods 303 of the lowermost rake section 3. Under the action of the elastic element, the two rake rods 303 of the lowermost rake section 3 tend to move downward. Specifically, the elastic element can be a first compression spring 306, which is sleeved on the support shaft 305. A stop 3051 is provided on the peripheral wall of the support shaft 305, and the stop 3051 is located above the uppermost rotating seat 3031. The first compression spring 306 is located between the stop 3051 and the uppermost rotating seat 3031. Under the action of the first compression spring 306, the two rake rods 303 of the lowermost rake section 3 tend to move downward.

[0043] The adjustment assembly includes an adjustment ring 601, a bracket 602, and multiple baffles 603. The adjustment ring 601 is fixedly sleeved on the support shaft 305 and located below the lowest rotating seat 3031. The top of the ring has a sloping structure that is inclined from back to front. The bottom of the rotating seat 3031 of the two rakes 303 of the lowest rake part 3 is provided with a sliding rod 307. The sliding rod 307 on the uppermost rotating seat 3031 slides through the lowermost rotating seat 3031 to avoid interference. Both sliding rods 307 slide and stop at the top of the adjustment ring 601.

[0044] The bracket 602 connects multiple baffles 603 into one unit and can slide elastically in the vertical direction. To facilitate the elastic sliding of the bracket 602, a second compression spring 604 is connected between the bracket 602 and the frame 2. The second compression spring 604 is vertically arranged, and under the action of the second compression spring 604, the bracket 602 has a downward tendency to move. At least one rake rod 303 of the lowermost rake section 3 is provided with a top rod 308, and the top rod 308 and the bracket 602 form a sliding stop engagement.

[0045] Furthermore, to ensure uniform force distribution on the support 602, two second compression springs 604 can be provided, arranged horizontally side by side in the left-right direction. Two top rods 308 can be provided, respectively installed on the two rake rods 303 of the lowest rake section 3, arranged horizontally side by side in the left-right direction, with both top rods 308 forming a sliding stop with the support 602.

[0046] During operation, as the amount of agricultural products conveyed on the bottom ring conveyor belt 4 increases, the two rakes 303 of the bottom rake section 3 gradually open under the push of the agricultural products. During the opening of the rakes 303 in the bottom rake section 3, the rakes 303 simultaneously rotate around the support shaft 305. With the cooperation of the slide rod 307 and the adjusting ring 601, the rakes 303 move upwards synchronously, and the first compression spring 306 compresses and stores force. When the rakes 303 move upwards, the support 602 and the baffle 603 move upwards simultaneously through the top rod 308, causing the discharge port 501 to narrow, ensuring a decrease in the feeding speed to match the drying speed. The second compression spring 604 compresses and stores force.

[0047] When the amount of agricultural products conveyed on the bottom ring mesh belt 4 decreases, the two rakes 303 of the bottom rake section 3 automatically reset under the action of the first compression spring 306; under the action of the second compression spring 604, the bracket 602 and the baffle 603 automatically reset, and the discharge port 501 increases to ensure that the feeding speed increases to match the drying speed.

[0048] In some embodiments, to further improve the drying consistency of agricultural products, the included angle between the two rakes 303 of the rake section 3 is set to gradually decrease from top to bottom.

[0049] Therefore, the angle between the rakes 303 in the upper rake section 3 is relatively large, and the number of grooves is relatively small; while as the layers move downwards, the angle between the rakes 303 gradually decreases, and the number of grooves increases accordingly. The lower layer is a key channel for hot air to penetrate upwards. More grooves can break the dense accumulation of agricultural products, forming a denser airflow path, thereby increasing the efficiency of hot air passage from top to bottom. This allows it to adapt to the flow pattern of hot air penetrating from bottom to top, ensuring that agricultural product areas at different levels receive the required amount of hot air, further realizing the on-demand distribution of hot air and providing an airflow basis for the uniform drying of agricultural products at each layer.

[0050] Meanwhile, the larger angle between the rakes 303 in the upper rake section 3 results in a relatively gentle agitation of the agricultural products, causing them to fall relatively early onto the lower ring mesh belt 4 after being agitated. As the layers descend, the angle between the rakes 303 gradually decreases, resulting in a more concentrated agitation force and stronger guidance. This causes the agricultural products on the lower ring mesh belt 4 to fall later, leading to a longer drying path for the upper agricultural products on the bottom ring mesh belt 4 and a relatively shorter drying path for the lower agricultural products. Considering that the pre-drying degree inside the outer shell 1 of the upper agricultural products is lower than that of the lower agricultural products, extending the residence time of the upper agricultural products in the final drying area (bottom ring mesh belt 4) can compensate for their insufficient pre-drying. Ultimately, this ensures that agricultural products falling from different ring mesh belts 4 to the bottom ring mesh belt 4 achieve a more consistent degree of dryness upon completion of the drying process, significantly improving the drying consistency of the entire batch of agricultural products.

[0051] In other embodiments, to improve the drying effect, a negative pressure setting is configured inside the outer casing 1.

[0052] In other embodiments, to facilitate the transfer of excess agricultural products from the middle and uppermost annular mesh belts 4 to the lowermost annular mesh belt 4, the bandwidth of the lowermost annular mesh belt 4 can be set to be greater than the bandwidth of the other annular mesh belts 4, so that excess agricultural products from the middle and uppermost annular mesh belts 4 can automatically fall to the lowermost annular mesh belt 4.

[0053] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0054] The above-described embodiments are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A vacuum belt drying device for agricultural products, characterized in that, The vacuum belt drying equipment for the agricultural products includes: shell; A heat source is configured to allow air at a preset temperature to be introduced into the housing from the bottom. The frame is housed within the outer casing; A ring-shaped mesh belt is installed on the frame and forms a closed conveying loop on the frame; there are multiple ring-shaped mesh belts, which are arranged in parallel and vertically, and the conveying direction is consistent; except for the bottommost ring-shaped mesh belt, the other ring-shaped mesh belts are configured to receive agricultural products. Multiple raking sections are all mounted on the frame and located above the annular mesh belt. Each section is configured to both evenly distribute the agricultural products on the annular mesh belt and create multiple grooves on the agricultural products. Except for the lowest raking section, the other raking sections are also configured to move excess agricultural products from the annular mesh belt to the lowest annular mesh belt. The raking section has two rakes, which are horizontally arranged and together form a V-shaped structure. Each rake has multiple rake teeth at its bottom, and these teeth are spaced apart along the extension direction of the rake. The closing direction of the two rakes in the lowermost raking section is opposite to the conveying direction of the lowermost annular mesh belt, ensuring that the agricultural products can be moved from the left and right sides towards the center during movement, achieving uniform lateral dispersion. The closing direction of the two rakes in the other raking sections is consistent with the conveying direction of the annular mesh belt, ensuring that the agricultural products can be moved from the center to the left and right sides during movement, achieving uniform lateral dispersion. It also includes multiple storage hoppers, all of which are mounted on the frame and configured to store agricultural products. Each hopper has a discharge port at its bottom. The multiple storage hoppers are located above the other annular mesh belts (excluding the lowest one) and can transport the agricultural products to the other annular mesh belts (excluding the lowest one) through their respective discharge ports. It also includes an adjustment component, which is configured to adjust the size of the discharge port according to the quantity of agricultural products transported on the lowest annular mesh belt. The more agricultural products there are, the smaller the discharge port becomes. The lowest rake section also has a support shaft, which is vertically arranged. The two rake rods of the lowest rake section are respectively rotatably sleeved on the support shaft and can both slide elastically in the vertical direction. The adjustment assembly includes an adjustment ring, a bracket, and multiple baffles. The adjustment ring is fixedly sleeved on the support shaft and has a sloping top. The bottom of the two rake rods of the lowest rake section is provided with a sliding rod, which slides and stops at the top of the adjustment ring. The baffle is located at the discharge port and is configured to block the discharge port. The bracket connects the multiple baffles into one unit and can slide elastically in the vertical direction. At least one rake rod of the lowest rake section is provided with a top rod, which forms a sliding stop with the bracket. An elastic element connects the support shaft and the two rakes of the lowest rake section. Under the action of the elastic element, the two rakes of the lowest rake section tend to move downward. Driven by the agricultural products, the two rakes of the lowest rake section gradually open. At the same time, the rakes rotate around the support shaft, and with the cooperation between the sliding rod and the adjusting ring, the rakes move upward synchronously. When the rakes move upward, they simultaneously drive the support and the baffle to move upward through the top rod, thereby narrowing the discharge port.

2. The vacuum belt drying equipment for agricultural products according to claim 1, characterized in that, The elastic element is a first compression spring, which is sleeved on the support shaft.

3. The vacuum belt drying equipment for agricultural products according to claim 1, characterized in that, From top to bottom, the included angle between the two rakes of the rake section gradually decreases.

4. The vacuum belt drying equipment for agricultural products according to claim 1, characterized in that, The bandwidth of the bottommost ring mesh is greater than the bandwidth of the other ring meshes.

5. The vacuum belt drying equipment for agricultural products according to claim 1, characterized in that, All of the annular mesh belts have the same bandwidth; the frame is also provided with two guide plates, which are located on both sides of the bandwidth direction of the lowest annular mesh belt, and the plate surfaces are inclined and form a figure-eight structure.

6. The vacuum belt drying equipment for agricultural products according to claim 1, characterized in that, The outer shell is designed with a negative pressure setting.

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