A potato grading and harvesting device

Abstract

This invention provides a potato grading and harvesting device, which includes a separation device, a conveying device, and a collection device. The separation device includes a first roller assembly and a second roller assembly. After the potato and soil mixture is separated and screened by the first roller assembly, first-grade potatoes are obtained. After the potato and soil mixture is separated and screened by the second roller assembly, second-grade potatoes are obtained. The first-grade and second-grade potatoes are respectively placed on the soil in different grades and areas under the action of the conveying device and the collection device. In this way, the device can grade potatoes and arrange the harvested potatoes according to size, which facilitates subsequent operations on potatoes of different grades.

Description

Technical Field

[0001] This application relates to the field of crop harvesting equipment technology, and in particular to a potato grading and harvesting device. Background Technology

[0002] Potatoes are a popular food crop, with the edible part mainly being the underground rootstock. Typically, potato harvesting involves first cutting down the exposed vines, and then using harvesting machinery to harvest the potatoes.

[0003] In common potato harvesting machinery, after potatoes are dug up, they enter a conveyor belt along with the soil. The mixture of potatoes and soil is conveyed upwards, eventually causing the potatoes to fall onto the soil surface. However, in this type of harvesting machinery, large and small potatoes are mixed together and conveyed to the rear of the harvester. Since large and small potatoes have different uses, large potatoes are usually stored, while smaller potatoes are usually transported directly to starch processing plants. Therefore, after harvesting, potatoes need to be graded, adding a grading process that is not only time-consuming but also requires manpower or equipment. Summary of the Invention

[0004] To address the aforementioned technical problems, this application provides a potato grading and harvesting device, including a frame and a digging shovel assembly, a separating device, a conveying device, and a collecting device mounted on the frame; the digging shovel assembly is located at the front end of the separating device, the conveying device is located at the rear end of the separating device, and the collecting device is located at the rear end of the conveying device.

[0005] The separation device includes a first roller assembly and a second roller assembly. The first roller assembly is located at the rear end of the digging shovel assembly, and the second roller assembly is located at the rear end of the first roller assembly. After the potato and soil mixture is separated and screened by the first roller assembly, a first-grade potato is obtained. After the potato and soil mixture is separated and screened by the second roller assembly, a second-grade potato is obtained.

[0006] In some embodiments of this application, the digging shovel assembly includes a digging shovel, a connecting fixing base, and a first vibration component. The digging shovel and the first vibration component are respectively disposed on the connecting fixing base. When the potato and soil cover or leave the first vibration component, the first vibration component vibrates, causing the soil to detach from the potato and fall out from the gap of the first vibration component.

[0007] In some embodiments of this application, the first vibration assembly includes a first mounting shaft, on which a plurality of first vibration units are sleeved at intervals. Each first vibration unit includes a symmetrically arranged first connecting plate and a vibration plate disposed in the middle of the first connecting plate.

[0008] In some embodiments of this application, the first roller assembly includes a first roller unit and a second roller unit arranged alternately at intervals; the height of the first roller unit and the second roller unit relative to the horizontal plane increases sequentially along the potato conveying direction; the surface of the first roller unit is provided with a first protrusion extending along the axial direction of the first roller unit, and a plurality of the first protrusions are arranged circumferentially along the first roller unit; the surface of the second roller unit is provided with a second protrusion, and the second protrusion extends spirally along the axial direction of the second roller unit.

[0009] In some embodiments of this application, the second roller assembly includes an upper roller assembly and a lower roller assembly, the upper roller assembly being disposed at the rear end of the first roller assembly, and the lower roller assembly being disposed below the upper roller assembly.

[0010] In some embodiments of this application, the upper roller assembly includes a plurality of second roller units arranged at intervals, with a gap of 50 mm between the plurality of second roller units.

[0011] In some embodiments of this application, the lower roller assembly includes a plurality of spaced-apart third roller units, and a third protrusion is provided on the surface of the third roller unit, the third protrusion being conical.

[0012] In some embodiments of this application, the third protrusions are arranged side by side along the axial direction of the third roller unit to form a third protrusion row, and a plurality of the third protrusion rows are arranged circumferentially along the third roller unit.

[0013] In some embodiments of this application, the conveying device includes an upper conveying assembly and a lower conveying assembly. The upper conveying assembly is disposed at the rear end of the upper roller assembly, and the lower conveying assembly is disposed at the rear end of the lower roller assembly. The upper conveying assembly is used to convey potatoes of a first level, and the lower conveying assembly is used to convey potatoes of a second level.

[0014] In some embodiments of this application, the collection device includes a guide trough disposed at the rear end of the upper conveying component and a potato collecting plate disposed at the rear end of the lower conveying component. The opening direction of the guide trough faces one side of the width direction of the device to achieve staggered placement of potatoes at the first and second levels.

[0015] Compared with the prior art, the present invention has the following advantages and beneficial effects: The potato grading and harvesting equipment of this application is equipped with a separation device, a conveying device, and a collection device. The separation device includes a first roller assembly and a second roller assembly. After the potato and soil mixture is separated and screened by the first roller assembly, first-grade potatoes are obtained. After the potato and soil mixture is separated and screened by the second roller assembly, second-grade potatoes are obtained. The first-grade and second-grade potatoes are placed on the soil in different grades and areas under the action of the conveying device and the collection device, respectively. In this way, the equipment can grade potatoes and arrange the dug potatoes according to size, which facilitates subsequent operations on potatoes of different grades.

[0016] It should be understood that the above general description and the following detailed description are merely exemplary and explanatory, and do not limit this document. Attached Figure Description

[0017] The accompanying drawings, which form part of this document, are used to provide a further understanding of the document. The illustrative embodiments and descriptions herein are used to explain the document and do not constitute an undue limitation thereof. In the drawings:

[0018] Figure 1 This is a schematic diagram of the structure of a potato grading and harvesting device provided in an exemplary embodiment of this application from a first angle;

[0019] Figure 2 This is a schematic diagram of the potato grading and harvesting device provided in an exemplary embodiment of this application from a second angle.

[0020] Figure 3 This is a top view of a potato grading and harvesting device provided in an exemplary embodiment of this application;

[0021] Figure 4 This is a schematic diagram of the first angle structure of the excavator shovel assembly provided in an exemplary embodiment of this application;

[0022] Figure 5 This is a schematic diagram of the second angle structure of the excavator shovel assembly provided in an exemplary embodiment of this application;

[0023] Figure 6 This is a front view of a separation device provided in an exemplary embodiment of this application;

[0024] Figure 7 This is a schematic diagram of the first angle structure of the separation device provided in an exemplary embodiment of this application;

[0025] Figure 8 This is a schematic diagram of the second angle structure of the separation device provided in an exemplary embodiment of this application;

[0026] Figure 9 yes Figure 8 Enlarged view of point A in the middle;

[0027] Figure 10 yes Figure 8 Enlarged view at point B in the middle;

[0028] Figure 11 This is a schematic diagram of the hidden part of the frame of a potato grading and harvesting device provided in an exemplary embodiment of this application.

[0029] In the picture:

[0030] 10. Frame; 20. Gearbox; 40. Digging shovel assembly; 401. Digging shovel; 402. Connecting fixing seat; 403. First vibration assembly; 4031. Vibrating plate; 4032. First mounting shaft; 4033. First connecting plate; 50. Separation device; 501. First roller assembly; 5011. First roller unit; 5011a. First protrusion; 5012. Second roller unit; 5012a. Second protrusion; 502. Second roller assembly; 5021. Upper roller assembly; 5022. Lower roller assembly; 5022a. Third roller unit; 5022b. Third roller assembly; 5022c. Third protrusion; 60. Conveying device; 601. Lower conveying assembly; 602. Upper conveying assembly; 70. Collection device; 701. Guide trough; 702. Potato collecting plate; 80. Sinking wheel. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be arbitrarily combined with each other.

[0032] In existing potato harvesting machinery, after being dug up, potatoes are fed onto a conveyor belt along with the soil. The mixture of potatoes and soil is then conveyed upwards until the potatoes fall to the soil surface. However, in this type of harvesting machinery, large and small potatoes are mixed together and conveyed to the rear of the machine. Since large and small potatoes have different uses—large potatoes are usually stored, while smaller potatoes are typically transported directly to starch processing plants—a grading process is required after harvesting. This grading process is time-consuming and requires manpower or equipment.

[0033] Based on this, an exemplary embodiment of this application provides a potato grading and harvesting device. The device includes a separation device, a conveying device, and a collection device. The separation device includes a first roller assembly and a second roller assembly. After the potato and soil mixture is separated and screened by the first roller assembly, first-grade potatoes are obtained. After the potato and soil mixture is separated and screened by the second roller assembly, second-grade potatoes are obtained. The first-grade and second-grade potatoes are placed on the soil in different grades and areas under the action of the conveying device and the collection device, respectively. In this way, the device can grade potatoes and arrange the harvested potatoes according to size, which facilitates subsequent operations on potatoes of different grades.

[0034] An exemplary embodiment of this application provides a potato grading and harvesting device, such as... Figures 1 to 3 As shown, the potato grading and harvesting equipment includes a frame 10 and a digging shovel assembly 40, a separating device 50, a conveying device 60, and a collecting device 70 mounted on the frame 10. The digging shovel assembly 40 is located at the front end of the separating device 50, the conveying device 60 is located at the rear end of the separating device 50, and the collecting device 70 is located at the rear end of the conveying device 60. In this application, "front end" and "rear end" are defined relative to the direction of potato transport; potatoes are transported from the front end of the equipment to the rear end. The digging shovel assembly 40 is used to dig potatoes out of the soil; the separating device 50 is used to separate the potatoes dug out by the digging shovel 40 from the soil; the conveying device 60 is used to transport the separated potatoes to the collecting device 70; and the collecting device 70 is used to collect the potatoes and classify them according to size. A gearbox 20 is installed at the top front end of the frame 10. The gearbox 20 is connected to the power take-off shaft at the rear of the tractor. The tractor provides power to the equipment. During operation, the tractor provides power to the equipment to dig, separate and transport potatoes while dragging the equipment, so that the potatoes are arranged on the soil surface according to grade.

[0035] In one embodiment, the device is powered solely by a tractor, saving space and volume. The tractor's power is first transmitted to the conveying device 60 via the gearbox 20, the first-stage sprocket, and the chain assembly, providing power to the conveying device 60. Then, the power is transmitted to the separating device 50 via the second-stage sprocket and chain assembly, and the rollers of the separating device 50 achieve synchronous transmission through the third-stage sprocket and chain assembly.

[0036] In one embodiment, such as Figures 1 to 3As shown, the equipment is also equipped with a tillage wheel 80, which is located on both sides of the frame 10, near the collection device 70. The tillage wheel 80 is used to control the tillage depth. By rotating the handle of the depth limiting wheel, the wheel of the tillage wheel 80 can be raised or lowered. By adjusting the height of the tillage wheel 80, the tillage depth can be controlled, and the digging depth can be further adjusted to reduce damage to potatoes during the digging process.

[0037] In one embodiment, such as Figure 4 and 5 As shown, the digging shovel assembly 40 includes a digging shovel 401, a connecting fixing base 402, and a first vibration assembly 403. The digging shovel 401 and the first vibration assembly 403 are respectively mounted on the connecting fixing base 402, which is fixed to the frame 10. Preferably, depending on the burial depth of the potatoes, in order to facilitate potato digging and reduce the resistance experienced by the equipment, the inclination angle between the digging shovel 401 and the horizontal plane is preferably 20° to 25°. At this angle, the digging shovel 401 can tilt downwards into the soil, reducing damage to the potatoes and minimizing digging resistance. If the inclination angle between the digging shovel 401 and the horizontal plane is less than 20°, the shovel 401 will damage a large number of potatoes during digging because it penetrates the soil too shallowly. When the inclination angle between the digging shovel 401 and the horizontal plane is greater than 25°, the shovel 401 penetrates the soil too deeply. During digging, the shovel 401 experiences great resistance, resulting in high energy consumption and increased digging difficulty.

[0038] When the device is in operation, the digging shovel 401 digs the potatoes and soil upwards together, and the mixture of potatoes and soil enters the digging shovel assembly 40. At this time, the surface of the potatoes usually has some soil adhering to it, as well as a certain amount of clods and a large amount of loose soil. The first vibration assembly 403 includes a first mounting shaft 4032, on which a plurality of first vibration units are sleeved. The first vibration unit includes a symmetrically arranged first connecting plate 4033 and a vibration plate 4031 disposed in the middle of the first connecting plate 4033. Preferably, the connecting fixing seat 402 has several spaced mounting grooves extending along the width direction of the connecting fixing seat 402. The first connecting plate 4033 is snapped into the mounting groove and fixedly connected to the connecting fixing seat 402. The vibrating plate 4031 includes a connecting part and a vibrating part. Two connecting parts are sleeved on the first mounting shaft 4032. The top of the connecting part is fixedly connected to the bottom of the digging shovel 401. The vibrating part is fixedly connected in the middle of the two connecting parts. Thus, when the mixture of potatoes and soil presses against the vibrating part and leaves the vibrating part, the vibrating part will vibrate under pressure and without pressure. Since the vibrating parts are spaced apart, before the mixture of potatoes and soil enters the separation device 50, the vibrating part will vibrate the mixture of potatoes and soil, making the soil on the surface of the potatoes loose, and at the same time, making some of the loose soil fall from the gaps between the vibrating parts to the ground surface, so as to achieve the purpose of preliminary separation of the mixture of potatoes and soil.

[0039] like Figures 6 to 8 As shown, the separation device 50 includes a first roller assembly 501 and a second roller assembly 502; the first roller assembly is disposed at the rear end of the digging shovel assembly 40 and spaced apart from the digging shovel assembly 40; the second roller assembly 502 is disposed at the rear end of the first roller assembly 501 and spaced apart from the first roller assembly 501; the potato and soil mixture is separated and screened by the first roller assembly 501 to obtain first-grade potatoes; the potato and soil mixture is separated and screened by the second roller assembly 502 to obtain second-grade potatoes.

[0040] There is resistance when digging up the mixture of potatoes and soil. In traditional potato harvesters, when the digging shovel 401 digs up the potato and soil mixture, the potatoes and soil mixture are fed onto the conveyor belt together. During the conveyor belt transport process, the soil rolls down along the conveyor belt to the front end. At this time, the soil accumulates at the front end of the conveyor belt, causing the conveyor belt to experience greater resistance. The friction between the moving mechanism that drives the conveyor belt to rotate, such as the chain, and the soil is very large, resulting in great resistance to the moving mechanism that drives the conveyor belt to rotate. This leads to high energy consumption of the equipment. In severe cases, it may cause the equipment to be blocked by soil and unable to operate.

[0041] In the device of this application, after the potato and soil mixture is vibrated by the first vibration component 403, some soil will fall off, and the soil that does not fall off will become loose with the potatoes. Then, the potato and soil mixture enters the first roller assembly 501. The first roller assembly 501 can further separate the potato and soil mixture, while preventing the potato and soil mixture from rolling off and preventing soil accumulation.

[0042] The first roller assembly 501 includes alternating first roller units 5011 and second roller units 5012. Preferably, to prevent small potatoes from falling through the gap between the first roller units 5011 and second roller units 5012, and to allow small soil or clods to fall, the gap between the first roller units 5011 and second roller units 5012 is 20 mm. The height of the first roller units 5011 and second roller units 5012 relative to the horizontal plane increases sequentially along the potato conveying direction. During this process, after being conveyed by the first roller units 5011 and second roller units 5012, soil or clods smaller than 20 mm in size in the potato and soil mixture will fall to the ground through the gap between the first roller units 5011 and second roller units 5012. Figure 6 As shown, along the potato conveying direction, the height of the first roller assembly 501 relative to the ground gradually increases, showing an overall upward trend. Preferably, the angle between the first roller assembly 501 and the horizontal plane is 15° to 20°. This helps the potatoes to be conveyed upward along the first roller assembly 501, while preventing the potatoes and soil from sliding down and accumulating due to an excessively large angle.

[0043] In one embodiment, such as Figure 9 As shown, the surface of the first roller unit 5011 is provided with a first protrusion 5011a extending along the axial direction of the first roller unit 5011. A plurality of first protrusions 5011a are arranged circumferentially along the first roller unit 5011, so that the surface of the first roller unit 5011 forms a wavy uneven surface, which facilitates the separation of the mixture of soil and potatoes. The wavy surface of the first roller unit 5011 helps to push the potatoes to move on the first roller unit 5011, while the uneven surface can promote the separation between the soil and potatoes.

[0044] Continue to refer to Figure 9 The second roller unit 5012 has a second protrusion 5012a on its surface. The second protrusion 5012a extends spirally along the axial direction of the second roller unit 5012, making the surface of the second roller unit 5012 spiral-shaped. This facilitates the separation of potatoes from soil and smaller objects such as potato roots and weeds. The spiral surface also promotes soil discharge when the second roller unit 5012 rolls.

[0045] like Figure 7 As shown, the first roller assembly 501 includes alternating first roller units 5011 and second roller units 5012. The surfaces of the alternating first roller units 5011 and second roller units 5012 provide different contact patterns for the potato and soil mixture, which can reduce damage to the potatoes during separation and transportation, keeping the potatoes intact. Simultaneously, it allows the soil to separate from the potatoes, with fine soil particles falling through the gaps between the first roller units 5011 and second roller units 5012, resulting in a mixture of potatoes and soil clumps.

[0046] In one embodiment, the second roller assembly 502 includes an upper roller assembly 5021 and a lower roller assembly 5022. The upper roller assembly 5021 is disposed at the rear end of the first roller assembly 501, and the lower roller assembly 5022 is disposed below the upper roller assembly 5021. The upper roller assembly 5021 includes a plurality of spaced-apart second roller units 5012, preferably with a gap of 50 mm between the plurality of second roller units 5012. After the mixture of potatoes and soil obtained after separation by the first roller assembly 501 enters the upper roller assembly 5021, second-level potatoes and soil with a size smaller than 50 mm will fall from the gap between the second roller units 5012 onto the lower roller assembly 5022, while first-level potatoes with a size larger than 50 mm remain on the upper roller assembly 5021 and are conveyed backward by the upper roller assembly 5021 to the conveying device 60.

[0047] The upper roller assembly 5021 is entirely composed of second roller units 5012, and the second roller units 5012 are arranged at different heights, such as... Figure 8 As shown, along the potato conveying direction, the second roller units 5012 of the upper roller assembly 5021 are arranged in a low-high-low-high configuration in the height direction. Thus, during potato conveying, the potential energy difference generated by the high-low arrangement of the rollers further separates the soil from the potato surface, allowing the soil to fall to the ground through the gaps between the second roller units 5012. Simultaneously, the spiral surface of the second roller units 5012 facilitates soil discharge during rolling, preventing damage to the potatoes.

[0048] In one embodiment, such as Figure 10As shown, the lower roller assembly 5022 includes multiple spaced-apart third roller units 5022a, with a gap of 22mm between them. A third protrusion 5022c, which is conical, is provided on the surface of each third roller unit 5022a. After a mixture of potatoes and soil clods smaller than 50mm falls onto the lower roller assembly 5022, the third protrusion 5022c further separates the soil from the potatoes, causing the separated soil to fall through the gaps between the third roller units 5022a. Simultaneously, as the third roller units 5022a rotate, the third protrusion 5022c breaks up the soil clods, causing the broken clods to fall through the gaps between the third roller units 5022a, thus achieving separation between the potatoes and the soil / clods.

[0049] Preferably, the third protrusions 5022c are arranged side by side along the axial direction of the third roller unit 5022a to form a third protrusion row. Multiple third protrusion rows are arranged circumferentially along the third roller unit 5022a. The third protrusions 5022c can also be arranged irregularly. In this way, as the third roller unit 5022a rotates, the third protrusions 5022c can increase the friction between the potato and the third roller unit 5022a, which makes it easier to peel the soil covering the potato surface off the potato, so that the potato and the soil are further separated. The separated soil falls to the ground through the gap between the two third roller units 5022a. Along the potato conveying direction, the height of the lower roller assembly 5022 relative to the ground gradually increases, showing an overall upward trend. Preferably, the angle between the lower roller assembly 5022 and the horizontal plane is 15° to 20°. This helps the potatoes to be conveyed upward along the lower roller assembly 5022, while preventing the potatoes and soil from sliding down and accumulating due to an excessively large angle.

[0050] In one embodiment, a third roller assembly 5022b is further provided between the lower roller assembly 5022 and the upper roller assembly 5021. The third roller assembly 5022b is a passive roller. Preferably, the third roller assembly 5022b includes spaced-apart pressing rollers. The line connecting the axis of the pressing rollers and the axis of the third roller unit 5022a is perpendicular to the potato conveying direction. The inclination angle between the third roller assembly 5022b and the horizontal plane is the same as the inclination angle between the lower roller assembly 5022 and the horizontal plane. Figure 6 and 8As shown, the third roller assembly 5022b includes two pressing rollers. Each pressing roller has a fourth protrusion spaced circumferentially along its surface, extending axially along the roller and having a triangular cross-sectional shape. When potatoes and soil clods are conveyed along the lower roller assembly 5022, and enter between the lower roller assembly 5022 and the third roller assembly 5022b, both assemblies simultaneously peel the soil from the potato surface, further separating the soil from the potato surface.

[0051] like Figure 11 As shown, the conveying device 60 includes an upper conveying assembly 602 and a lower conveying assembly 601. The upper conveying assembly 602 is located at the rear end of the upper roller assembly 5021, and the lower conveying assembly 601 is located at the rear end of the lower roller assembly 5022. The upper conveying assembly 602 is used to convey potatoes of the first level, and the lower conveying assembly 601 is used to convey potatoes of the second level. The collecting device 70 includes a guide trough 701 located at the rear end of the upper conveying assembly 602 and a potato collecting plate 702 located at the rear end of the lower conveying assembly 601. The opening of the guide trough 701 faces the width direction of the device to achieve staggered placement of potatoes of the first and second levels.

[0052] The first-grade potatoes, conveyed by the first roller assembly 501 and the upper roller assembly 5021, enter the upper conveyor assembly 602 and are transported along it to the guide trough 701, where they roll down to the ground. The second-grade potatoes, conveyed by the lower roller assembly 5022, enter the lower conveyor assembly 601 and are transported along it to the rear end of the device, where they are collected by the potato collecting plate 702 and fall to the ground. This process allows the first-grade and second-grade potatoes to be arranged in different locations on the ground, achieving graded harvesting of potatoes.

[0053] In this application, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that an article or device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an article or device. Without further limitation, an element defined by the phrase "comprising..." does not exclude the presence of other identical elements in the article or device that includes said element.

[0054] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0055] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if these modifications and variations fall within the scope of the claims of this application and their equivalents, the intent of this application also includes these modifications and variations.

Claims

1. A potato grading and harvesting device, characterized in that, It includes a frame and a digging shovel assembly, a separating device, a conveying device, and a collecting device mounted on the frame; the digging shovel assembly is located at the front end of the separating device, the conveying device is located at the rear end of the separating device, and the collecting device is located at the rear end of the conveying device; The separation device includes a first roller assembly and a second roller assembly. The first roller assembly is located at the rear end of the digging shovel assembly, and the second roller assembly is located at the rear end of the first roller assembly. After the potato and soil mixture is separated and screened by the first roller assembly, first-grade potatoes are obtained. After the potato and soil mixture is separated and screened by the second roller assembly, second-grade potatoes are obtained. The first roller assembly includes alternating first roller units and second roller units; the heights of the first roller units and the second roller units relative to the horizontal plane increase sequentially along the potato conveying direction; the surface of the first roller unit is provided with a first protrusion extending along the axial direction of the first roller unit, and a plurality of the first protrusions are arranged circumferentially along the first roller unit; the surface of the second roller unit is provided with a second protrusion, and the second protrusion extends spirally along the axial direction of the second roller unit; The second roller assembly includes an upper roller assembly and a lower roller assembly. The upper roller assembly is disposed at the rear end of the first roller assembly, and the lower roller assembly is disposed below the upper roller assembly. The upper roller assembly includes a plurality of second roller units arranged at intervals, with a gap of 50 mm between the plurality of second roller units; The lower roller assembly includes a plurality of spaced third roller units, and a third protrusion is provided on the surface of the third roller unit, the third protrusion being conical; The third protrusions are arranged side by side along the axial direction of the third roller unit to form a third protrusion row, and multiple third protrusion rows are arranged circumferentially along the third roller unit.

2. The potato grading and harvesting equipment according to claim 1, characterized in that, The digging shovel assembly includes a digging shovel, a connecting base, and a first vibration component. The digging shovel and the first vibration component are respectively mounted on the connecting base. When the potato and soil cover or leave the first vibration component, the first vibration component vibrates, causing the soil to detach from the potato and fall out through the gaps in the first vibration component.

3. The potato grading and harvesting equipment according to claim 2, characterized in that, The first vibration assembly includes a first mounting shaft, on which a plurality of first vibration units are arranged at intervals. Each first vibration unit includes a first connecting plate arranged symmetrically and a vibration plate disposed in the middle of the first connecting plate.

4. The potato grading and harvesting equipment according to claim 1, characterized in that, The conveying device includes an upper conveying assembly and a lower conveying assembly. The upper conveying assembly is located at the rear end of the upper roller assembly, and the lower conveying assembly is located at the rear end of the lower roller assembly. The upper conveying assembly is used to convey potatoes of the first level, and the lower conveying assembly is used to convey potatoes of the second level.

5. The potato grading and harvesting equipment according to claim 4, characterized in that, The collection device includes a guide trough disposed at the rear end of the upper conveying component and a potato collection plate disposed at the rear end of the lower conveying component. The opening of the guide trough faces the width direction of the device to achieve staggered placement of potatoes at the first and second levels.

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