A lister device with step-by-step screening of potatoes

Abstract

The utility model relates to a kind of potato's plow device with step-by-step screening, including front and rear connection's front frame and rear frame, its bottom is equipped with the gyro wheel for advancing, the front frame is provided with the ploughing mechanism for plowing potato, it includes multiple ploughs, with the front frame forward shovel, this plough rear frame is equipped with the dumping mechanism for receiving potato and transporting, it includes the chain link group that circulates and rolls, the chain link group is equipped with screening mechanism, for the screening collection of potato;The potato plow device is combined with ploughing mechanism, dumping mechanism and screening mechanism, using step-by-step screening mode, effectively improve the efficiency and precision of potato harvesting, reduce manual intervention, protect the quality of potato, while adapting to the working needs of different soil conditions.

Description

Technical Field

[0001] This utility model belongs to the technical field of sled devices, and specifically relates to a sled device with a step-by-step potato screening function. Background Technology

[0002] Potato sled harvesting is a common harvesting method in modern agriculture, especially in large-scale mechanized potato cultivation. However, with the continuous development of harvesting technology, the problem of impurities encountered during potato sled harvesting has become increasingly serious, particularly in the separation of potatoes from soil, stones, and other debris. Impurities mixed into the potatoes not only affect their quality but also increase the difficulty of subsequent processing and screening. While traditional sled devices can effectively loosen and collect potatoes from the soil, the lack of an effective impurity separation mechanism often results in harvested potatoes containing large amounts of soil, stones, and root residue, severely impacting harvesting efficiency and product quality.

[0003] Currently, the design of potato sled harvesting equipment mainly focuses on improving harvesting efficiency and reducing damage to potatoes, but the screening and removal of impurities has not received sufficient attention. Traditional sled devices collect and transport potatoes through plows and turning mechanisms; however, these mechanical devices have not achieved ideal results in separating potatoes from impurities. Especially when potatoes are mixed with soil, impurities are often carried into the harvesting system, increasing the workload of subsequent screening and washing. In addition, existing screening mechanisms often only perform coarse screening, failing to effectively remove small clods of soil and root residues. This not only increases the workload of subsequent manual processing but also affects the appearance and quality of the potatoes, further impacting market sales.

[0004] Therefore, achieving more precise impurity screening and efficient potato separation during potato harvesting has become a major challenge in the design of current agricultural mechanization equipment. To address this issue, designing a more precise screening mechanism and an efficient impurity removal system is particularly important. This not only helps improve the quality and efficiency of potato harvesting but also effectively reduces subsequent processing costs, bringing higher economic benefits to agricultural production. Utility Model Content

[0005] This utility model addresses the shortcomings of existing technologies by providing a sled device with a step-by-step potato screening function. The specific technical solution is as follows: This utility model provides a sled device with a step-by-step potato screening function, including a front frame and a rear frame connected front to back. The bottom of the frame is equipped with rollers for traveling. The front frame is equipped with a plowing mechanism for plowing potatoes, which includes multiple upright plow blades that scoop potatoes forward with the front frame. The rear frame of the plow blades is equipped with a turning mechanism for receiving and transferring potatoes, which includes a chain rod assembly that rotates in a cycle. A screening mechanism is provided behind the chain rod assembly for screening and collecting potatoes.

[0006] As a preferred technical solution of this utility model, the screening mechanism includes a cylindrical shaft support connected to the front end of the rear frame, on which a screening motor is mounted. The screening motor is connected to a roller that rotates obliquely to the rear, which receives the plowed potatoes for secondary screening.

[0007] As a preferred technical solution of this utility model, the outer circumferential surface of the roller is provided with multiple rotatable shafts, with gaps provided between them for removing potato bits and soil, and they rotate synchronously with the roller to loosen and separate the potatoes.

[0008] As a preferred technical solution of this utility model, the plowing mechanism also includes a plowing frame connected to the front frame head, with multiple vertical lifting holes arranged at its front end. The plowing frame is fixed to the plow blade through the lifting holes and is used for the first screening of the plowed soil after plowing.

[0009] As a preferred technical solution of this utility model, the plow blade is evenly provided with a plurality of through holes that match the lifting holes, and a traction ring for pulling the climbing plow device forward is provided at the front end of the plow frame. The plowing depth of the plow blade is selected according to the traction height to plow out the potatoes.

[0010] As a preferred technical solution of this utility model, the bottom end of the plow is provided with crisscrossing blades for non-destructive plowing of potatoes.

[0011] As a preferred technical solution of this utility model, the turning mechanism further includes sprocket shafts disposed at both ends of the front frame, which are sleeved and driven with the chain rod assembly. One side of the upper sprocket shaft is connected to a turning motor for driving the chain rod assembly, and the other side is provided with a turning pulley. A V-shaped feeding shovel is connected to the front end of the chain rod assembly for non-destructive transfer of potatoes.

[0012] As a preferred technical solution of this utility model, a soil rolling mechanism is provided between the turning mechanism and the screening mechanism. The soil rolling mechanism includes side plates respectively erected behind the chain rod assembly. A driving roller and a driven roller staggered vertically are inserted between the side plates. One side of the driving roller is connected to the sprocket shaft through a turning pulley, and a soil rolling pulley is sleeved on the other side of the driving roller and connected to the driven roller, so as to realize the synchronous transmission between the turning mechanism and the soil rolling mechanism.

[0013] As a preferred technical solution of this utility model, a guide plate and a slag discharge plate are arranged in sequence below the driven roller, and a height difference is provided between them to avoid the accumulation of broken soil, which is used for the centralized treatment of broken soil in the potato drum screening.

[0014] As a preferred embodiment of this utility model, the rear of the screening mechanism is provided with a guide trough for the batch collection of screened potatoes.

[0015] As a preferred technical solution of this utility model, a slider is installed on the shaft side of the lower sprocket shaft and connected to the front frame, which slides and adjusts according to the tightness of the chain rod assembly, and is used for adjusting the tension of the chain rod assembly.

[0016] The beneficial effects of this utility model are: 1. Improve potato harvesting efficiency This climbing sled device, with its front and rear frames connected at the front and rear, and rollers mounted at the bottom, allows for stable propulsion and adaptability to various soil conditions. The plowing mechanism on the front frame employs multiple vertical plow blades, which gradually loosen the soil and scoop up the potatoes. This design ensures soil looseness during potato harvesting, effectively reducing potato adhesion to the soil, avoiding potato damage and excessive impurities common in traditional harvesting methods, and improving harvesting efficiency.

[0017] 2. Step-by-step screening to ensure accurate potato separation and selection. The plowing mechanism of the sled is followed by a turning mechanism, which promptly turns and transfers the potatoes to the next screening stage. The turning mechanism uses a circulating chain linkage, a design that ensures a smooth transition during potato transport and provides good potato flowability for subsequent screening. Furthermore, the chain linkage design reduces damage to the potatoes, helping to ensure their integrity throughout the harvesting process.

[0018] 3. The screening mechanism ensures potato quality. A screening mechanism is installed after the turning mechanism. The screening system, with its multi-grid design, effectively separates potatoes from impurities and soil clumps. This screening mechanism ensures that potatoes are thoroughly screened during harvesting, preventing impurities from mixing in and guaranteeing the purity and quality of the potatoes. This process not only improves potato collection efficiency but also reduces the workload of manual screening later on, increasing the automation level of the entire production process.

[0019] 4. Improve operational stability and adaptability Through its front and rear frame design and roller-driven movement, the climbing sled can adapt to different terrains and soil conditions. The height of the multiple upright shovels in the plowing mechanism can be adjusted according to the hardness and characteristics of the soil, meeting the needs of different farmlands.

[0020] 5. Reduce manual labor and increase labor productivity The design of this device significantly reduces the need for manual intervention. Through an automated screening, shoveling, and transfer system, it can efficiently complete the harvesting and screening of potatoes. By combining step-by-step screening and turning, potatoes undergo multiple automatic screening processes within the device, reducing the time spent manually cleaning impurities and picking potatoes, thereby improving overall labor productivity and saving labor costs.

[0021] 6. Environmental Protection and Energy Conservation The sled device employs mechanized operations, effectively reducing soil compaction and damage caused by traditional manual harvesting methods. Precise sifting minimizes unnecessary soil disturbance and avoids environmental pollution. Furthermore, its rational design enables efficient operation, reducing energy consumption and demonstrating good environmental and energy-saving effects.

[0022] In summary, this potato sled device, by combining a plowing mechanism, a turning mechanism, and a screening mechanism, and adopting a step-by-step screening method, effectively improves the efficiency and accuracy of potato harvesting, reduces manual intervention, ensures potato quality, and adapts to the working requirements of different soil conditions. Attached Figure Description

[0023] Figure 1 A schematic diagram of the overall structure of this utility model is shown; Figure 2 A schematic diagram of the plowing mechanism in this utility model is shown; Figure 3 This invention presents a schematic diagram showing the combination of the soil-rolling mechanism and the turning mechanism. Figure 4 This invention presents a schematic diagram showing the combination of a soil-rolling mechanism and a screening mechanism. Figure 5 This invention presents a schematic diagram showing the combination of the screening mechanism and the feed trough. Figure 6 This invention illustrates a structural diagram of the combination of the guide plate and the slag discharge plate. The diagram shows: 1. Rear frame; 2. Front frame; 3. Plowing mechanism; 31. Plowing frame; 311. Lifting hole; 32. Plow blade; 321. Shovel; 33. Traction ring; 4. Turning mechanism; 41. Feed shovel; 42. Sprocket shaft; 43. Chain rod assembly; 44. Sliding block; 45. Turning motor; 46. Turning pulley; 5. Soil grinding mechanism; 51. Side plate; 52. Soil grinding pulley; 53. Driving roller; 54. Driven roller; 55. Slag discharge plate; 56. Guide plate; 6. Screening mechanism; 61. Cylinder shaft support; 62. Drum; 621. Rotating shaft; 63. Screening motor; 7. Guide chute. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this utility model. Example 1

[0025] To address the technical problems in the background art, a sled device with step-by-step potato screening is provided as follows: Combination Figure 1-4 As shown, a sled device with a step-by-step potato screening function includes a front frame 2 and a rear frame 1 connected front to back. The bottom of the frame is equipped with rollers for travel. The front frame 2 is equipped with a plowing mechanism 3 for plowing potatoes, which includes multiple upright plow shovels 32 that scoop potatoes forward with the front frame 2. The rear frame 1 is equipped with a turning mechanism 4 for receiving and transferring potatoes, which includes a chain rod assembly 43 that rotates in a circular manner. A screening mechanism 6 is provided behind the chain rod assembly 43 for screening and collecting potatoes.

[0026] Please refer to the instruction manual appendix. Figure 1-4 This embodiment provides a first embodiment of a sled device with a step-by-step potato screening function. In this embodiment, the sled device mainly consists of a front frame 2 and a rear frame 1 connected front to back. The front frame 2 and the rear frame 1 are stably connected by connecting components, and the bottom is equipped with rollers for travel to ensure stable movement of the device on the ground. A plowing mechanism 3 is provided on the front frame 2 for gradually loosening and shoveling potatoes from the soil. The plowing mechanism 3 consists of multiple upright plow blades 32. The design of the plow blades 32 allows them to move forward with the front frame 2 and effectively shovel potatoes from the soil, separating the potatoes from the soil.

[0027] A tipping mechanism 4 is located behind the plowing mechanism 3, mainly used to receive and transfer the shoveled potatoes. The tipping mechanism 4 adopts a design of a continuously rolling chain rod assembly 43. This chain rod assembly 43 moves continuously, which can stably transport the shoveled potatoes from the plowing area to the rear. The chain rod assembly 43 ensures a smooth transition of the potatoes, effectively preventing damage to the potatoes due to rough transportation and maintaining the integrity of the potatoes.

[0028] A screening mechanism 6 is installed after the chain rod assembly 43 for screening and collecting potatoes. The screening mechanism 6, with its dense grid, can separate potatoes from impurities, soil particles, etc., based on their size and shape. The design of the screening system can be adjusted according to the actual conditions of the potatoes to ensure the smooth progress of the screening process and improve the efficiency and quality of potato collection.

[0029] The sled device in this embodiment has a reasonable structure, which can realize the step-by-step screening and efficient collection of potatoes during the working process, ensuring the integrity and purity of the potatoes, while reducing soil disturbance and improving harvesting efficiency. Example 2

[0030] Combination Figure 1-5 As shown, based on the above embodiments, this embodiment further provides the following: In this embodiment, the plowing mechanism 3 also includes a plowing frame 31 connected to the front of the front frame 2. The front end of the frame 31 is provided with a plurality of vertical lifting holes 311. The plowing frame 31 is fixed to the plow shovel 32 through the lifting holes 311 and is used for the first screening of the soil after plowing by the plow shovel 32.

[0031] The plow shovel 32 is evenly provided with multiple through holes that match the lifting holes 311, and a traction ring 33 for pulling the climbing plow forward is provided at the front end of the plow frame 31. The plowing depth of the plow shovel 32 is selected according to the traction height to plow out the potatoes.

[0032] The bottom end of the plow 32 is provided with crisscrossing blades 321 for non-destructive plowing of potatoes.

[0033] The screening mechanism 6 includes a cylindrical shaft support 61 connected to the front end of the rear frame 1, on which a screening motor 63 is mounted. The screening motor 63 is connected to a roller 62 that rotates at an angle to the rear, which receives the potatoes from the plow and performs a secondary screening.

[0034] The outer circumferential surface of the roller 62 is provided with multiple rotatable shafts 621, which are provided with gaps for removing potato bits and soil, and rotate synchronously with the roller 62 to loosen and separate the potatoes.

[0035] Please refer to the instruction manual appendix. Figure 1-5 This utility model provides a second embodiment of a sled device with a step-by-step potato screening function. In this embodiment, the sledding mechanism 3 of the device includes a sledding frame 31 connected to the front end of the front frame 2. The front end of the sledding frame 31 is provided with multiple vertical lifting holes 311, which are used for fixed connection with the sled 32. Through the cooperation of the lifting holes 311, the sledding frame 31 and the sled 32 can achieve one-time potato screening during sledding. The design of the sledding frame 31 allows the sled 32 to effectively loosen the soil and turn over the potatoes, while the lifting holes 311 provide flexible adjustment space for the sled 32, allowing the working depth of the sled 32 to be adjusted according to different soil conditions and operational needs, ensuring efficient potato harvesting.

[0036] In the design of the plow shovel 32, multiple through holes are evenly distributed on its surface to match the lifting holes 311. These through holes allow the plow shovel 32 to better adapt to soil conditions, improving potato harvesting efficiency. Furthermore, a traction ring 33 is provided at the front end of the plowing frame 31 for pulling the climbing shovel forward. The traction ring 33 is designed to select the plowing depth of the plow shovel 32 based on the traction height, further achieving efficient potato harvesting. The traction ring 33 is connected to the plowing frame 31 via a connecting device, effectively pulling the entire climbing shovel device to stably harvest potatoes as the equipment moves forward.

[0037] The bottom of the plow shovel 32 is equipped with crisscrossing blades 321. The staggered arrangement of the blades 321 enables the plowing device to plow through the soil without causing damage. The design of the blades 321 ensures that the potatoes are not excessively squeezed and damaged during turning, maintaining the integrity of the potatoes and thus improving the quality of the harvest.

[0038] Next, the screening mechanism 6 of the sled device is located at the front end of the rear frame 1 and connected to the screening motor 63 via the cylinder shaft bracket 61. The screening motor 63 drives the rear drum 62 to rotate, thereby performing secondary screening on the potatoes that have already been scooped up. The drum 62 and the screening motor 63 are connected through a transmission system. The drum 62 adopts an oblique rotation design, which allows the potatoes to be fully loosened and separated inside the drum 62. Multiple rotatable shafts 621 are inserted through the outer circumference of the drum 62, and gaps are provided between the shafts 621 to remove potato fragments and soil. As the drum 62 rotates, these shafts 621 rotate synchronously with the gaps, effectively separating the potatoes from soil fragments, avoiding mixing of potatoes and soil, and ensuring a more efficient potato screening process.

[0039] The design of this screening system allows for further loosening and separation of potatoes as they pass through roller 62, completely separating them from impurities in the soil and ensuring potato purity. Through the precise screening of the screening mechanism 6, the sled device efficiently screens and collects potatoes, reducing mixing with impurities and improving potato quality. The design of the rotating shaft 621 and gaps within roller 62 not only separates potatoes from soil but also effectively reduces potato damage, ensuring good protection for the potatoes throughout the process.

[0040] The sled device in this embodiment combines the plowing mechanism 3, the turning mechanism 4, and the screening mechanism 6. Through the coordinated operation of different functional areas, the potato harvesting process becomes more efficient and precise. The design of the plow frame 31 and the plow shovel 32 ensures the step-by-step screening of potatoes. The screening system effectively separates potatoes from impurities through the cooperation of the roller 62 and the rotating shaft 621. The overall structure is simple and efficient, providing a new solution for mechanized agricultural operations. Example 3

[0041] Combination Figure 1-5 As shown, based on the above embodiments, this embodiment further provides the following: In this embodiment, the turning mechanism 4 also includes sprocket shafts 42 disposed at both ends of the front frame 2, which are sleeved and driven with the chain rod assembly 43. One side of the upper sprocket shaft 42 is connected to a turning motor 45 for driving the chain rod assembly 43, and the other side is provided with a turning pulley 46. A V-shaped feeding shovel 41 is connected to the front end of the chain rod assembly 43 for non-destructive transfer of potatoes.

[0042] A soil-rolling mechanism 5 is provided between the turning mechanism 4 and the screening mechanism 6. It includes side plates 51 respectively erected behind the chain rod assembly 43. A drive roller 53 and a driven roller 54 staggered vertically are inserted between the side plates 51. One side of the drive roller 53 is connected to the sprocket shaft 42 through the turning pulley 46, and a soil-rolling pulley 52 is sleeved on the other side of the drive roller 53 and connected to the driven roller 54, so as to realize the synchronous transmission between the turning mechanism 4 and the soil-rolling mechanism 5.

[0043] Below the driven roller 54, a guide plate 56 and a slag discharge plate 55 are arranged in sequence, with a height difference between them to avoid the accumulation of broken soil, and for the centralized treatment of broken soil when the potato is screened by the roller 62.

[0044] The rear of the screening mechanism 6 is provided with a guide trough 7 for the bulk collection of screened potatoes.

[0045] Please refer to the instruction manual appendix. Figure 1-5 This utility model provides a third embodiment of a sled device with a step-by-step potato sorting function. In this embodiment, the turning mechanism 4 includes sprocket shafts 42 disposed at both ends of the front frame 2. The sprocket shafts 42 are sleeved with the chain rod assembly 43 for transmission, and the rotation of the sprocket shafts 42 drives the chain rod assembly 43 to perform smooth transmission work. A turning motor 45 is connected to one side of the upper end of the sprocket shafts 42, and the motor provides power to drive the chain rod assembly 43, enabling it to efficiently transfer potatoes during operation. A turning pulley 46 is provided on the other side of the sprocket shafts 42. The turning pulley 46 is connected to the chain rod assembly 43, and the rotation of the turning pulley 46 drives the potatoes to be transferred through the turning mechanism 4.

[0046] A V-shaped feed shovel 41 is attached to the front end of the chain rod assembly 43. The V-shaped feed shovel 41 is used to smoothly and without damage transfer the potatoes from the plowing area to the subsequent screening stage. This design ensures that the potatoes are not subjected to excessive impact damage during the transfer process, thus maintaining the integrity of the potatoes.

[0047] A soil-rolling mechanism 5 is provided between the turning mechanism 4 and the screening mechanism 6. The soil-rolling mechanism 5 consists of side plates 51 respectively erected behind the chain rod assembly 43, with a staggered drive roller 53 and driven roller 54 inserted between the side plates 51. One side of the drive roller 53 is connected to the sprocket shaft 42 via a turning pulley 46, ensuring that the turning mechanism 4 and the soil-rolling mechanism 5 can be driven synchronously, thereby effectively crushing and loosening the potatoes during the transfer process. The alternating movement of the drive roller 53 and the driven roller 54 helps to further separate the potatoes from the soil, ensuring a smooth transition of the potatoes.

[0048] Below the driven roller 54, a guide plate 56 and a slag discharge plate 55 are arranged in sequence. The design of the guide plate 56 and the slag discharge plate 55 ensures that potatoes do not accumulate during crushing and screening, while effectively guiding the discharge of broken soil and impurities, avoiding the problem of broken soil accumulation. The height difference between the guide plate 56 and the slag discharge plate 55 effectively solves the problem of broken soil accumulation and blockage, ensuring that broken soil and impurities can be discharged quickly.

[0049] The rear of the screening mechanism 6 is equipped with a guide chute 7 for bulk collection of screened potatoes. The guide chute 7, through its rational structural design, allows the screened potatoes to smoothly enter the collection area for further processing or packaging. The overall design ensures efficient connection and precise separation of each stage of the potato harvesting process, improving the accuracy and efficiency of potato screening.

[0050] Working principle and usage process of this utility model: First, the operator starts the tractor, driving the plowing mechanism 3 forward. The blade 321 of the plow shovel 32 then climbs up the soil, inserting itself into the soil and turning over the potatoes. Simultaneously, the turning motor 45 starts, driving the sprocket shaft 42 to rotate. The feed shovel 41 transfers the shoveled potatoes from the plowing area to the subsequent turning and screening area without damage. At this time, the potatoes gradually enter the turning stage along the direction of the feed shovel 41. The rotation of the sprocket shaft 42 drives the chain rod assembly 43 to perform smooth transmission work, and the chain rod assembly 43 pushes the potatoes through the turning mechanism 4 in sequence.

[0051] Meanwhile, one side of the drive roller 53 is connected to the sprocket shaft 42 via the turning pulley 46 and is synchronously driven by the sprocket shaft 42. Under the action of the soil rolling mechanism 5, the potatoes are crushed and loosened during the turning process, separating them from the soil. Then the potatoes enter the drum 62, and the screening motor 63 drives the drum 62 to rotate. The potatoes rotate, collide, and slide down inside the drum 62, achieving secondary screening. Finally, they fall into the guide chute 7. Guided by the guide chute 7, the screened potatoes will flow into the collection area to prepare for subsequent processing and packaging, while the screened soil fragments and impurities fall into the slag discharge plate 55 through the gaps in the drum 62 to complete the screening.

[0052] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A sled device with a step-by-step potato screening function, comprising a front frame (2) and a rear frame (1) connected front to back, wherein rollers for travel are installed at the bottom, characterized in that: The front frame (2) is equipped with a plowing mechanism (3) for plowing potatoes, which includes multiple upright plow shovels (32) that scoop potatoes forward as the front frame (2) moves. The rear frame (1) of the plow shovels (32) is equipped with a turning mechanism (4) for receiving potatoes for transfer, which includes a chain rod group (43) that rotates in a cycle. The chain rod group (43) is followed by a screening mechanism (6) for screening and collecting potatoes.

2. The sled device for progressively screening potatoes according to claim 1, characterized in that: The screening mechanism (6) includes a cylindrical shaft support (61) connected to the front end of the rear frame (1), on which a screening motor (63) is mounted. The screening motor (63) is connected to a roller (62) that rotates obliquely to the rear, which receives the plowed potatoes for secondary screening.

3. The sled device for progressively screening potatoes according to claim 2, characterized in that: The outer circumferential surface of the roller (62) is provided with multiple rotatable shafts (621), with gaps provided between them for removing potato soil fragments, and they rotate synchronously with the roller (62) for loosening and separating the potatoes.

4. The sled device for progressively screening potatoes according to claim 3, characterized in that: The plowing mechanism (3) also includes a plowing frame (31) connected to the head of the front frame (2), with multiple vertical lifting holes (311) arranged at its front end. The plowing frame (31) is fixed to the plow shovel (32) through the lifting holes (311) and is used for the first screening after the plowing by the plow shovel (32).

5. A sled device for progressively screening potatoes according to claim 4, characterized in that: The plow (32) is evenly provided with multiple through holes that match the lifting hole (311), and a traction ring (33) for pulling the climbing plow forward is provided at the front end of the plow frame (31). The plowing depth of the plow (32) is selected according to the traction height to plow out the potatoes.

6. A sled device for progressively screening potatoes according to claim 5, characterized in that: The bottom end of the plow (32) is provided with crisscrossing blades (321) for non-destructive plowing of potatoes.

7. A sled device for progressively screening potatoes according to claim 6, characterized in that: The turning mechanism (4) also includes sprocket shafts (42) set at both ends of the front frame (2), which are connected to the chain rod group (43) for transmission. One side of the upper sprocket shaft (42) is connected to a turning motor (45) for driving the chain rod group (43), and the other side is provided with a turning pulley (46). A V-shaped feeding shovel (41) is connected to the front end of the chain rod group (43) for non-destructive transfer of potatoes.

8. A sled device for progressively screening potatoes according to claim 7, characterized in that: A soil-rolling mechanism (5) is provided between the turning mechanism (4) and the screening mechanism (6). It includes side plates (51) respectively erected behind the chain rod group (43). A drive roller (53) and a driven roller (54) staggered vertically are inserted between the side plates (51). One side of the drive roller (53) is connected to the sprocket shaft (42) through the turning pulley (46), and a soil-rolling pulley (52) is sleeved on the other side of the drive roller (53) and connected to the driven roller (54), so as to realize the synchronous transmission of the turning mechanism (4) and the soil-rolling mechanism (5).

9. A sled device for progressively screening potatoes according to claim 8, characterized in that: Below the driven roller (54), a guide plate (56) and a slag discharge plate (55) are arranged in sequence, with a height difference between them to avoid the accumulation of broken soil, for the centralized treatment of broken soil when the drum (62) screens potatoes.

10. A sled device for progressively screening potatoes according to any one of claims 1-9, characterized in that: The rear of the screening mechanism (6) is provided with a guide trough (7) for screening and collecting potatoes in batches.

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