Potato harvester

Abstract

The utility model relates to agricultural mechanical equipment, in particular to a potato harvester which comprises a rack, a soil shaking mechanism, a conveying mechanism, a transmission mechanism and a power mechanism. The soil shaking mechanism is fixed below the rack; the transmission mechanism is fixed on the outer side of the rack; a power mechanism is arranged above the rack; an obliquely-arranged conveying mechanism is arranged in the rack. The machine frame further comprises rear wheels fixed to the bottom end of the machine frame. The conveying mechanism comprises a driven wheel, a first chain, a first chain wheel, a rear strip scattering plate and a plurality of screening rods. A gear of the first chain wheel is meshed with the first chain; the first chain wheel is in chain transmission with the driven wheel; the driven wheel is fixed on the inner side of the rack; the two ends of the screening rods are connected with the first chains correspondingly. The multiple screening rods are sequentially arranged front and back to form an annular structure. And the rear strip scattering plate is fixed at the tail end of the rack. According to the utility model, the efficient and mild potato harvesting is realized by adjusting and optimizing power transmission through the sieve rod structure and the gearbox, the efficiency and the quality are improved, and the labor intensity and the waste are reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to an agricultural machinery equipment, concretely relates to a potato harvester. BACKGROUND

[0002] Potato is an important economic crop, and its planting area and demand are increasing year by year. The traditional potato harvesting method mainly relies on manpower, and there are problems such as high labor intensity, low efficiency, high potato damage rate and so on. Manual excavation not only consumes time and effort, but also easily causes physical damage to potatoes, affecting their quality and market value. In addition, there are often residual potatoes in the soil after manual harvesting, resulting in resource waste.

[0003] With the development of agricultural modernization, mechanized harvesting has gradually become the mainstream. Potato harvesters realize efficient excavation, soil shaking and transportation through mechanical means, significantly improving harvesting efficiency and reducing labor intensity. However, the existing potato harvesters still have some shortcomings, such as incomplete soil separation and high potato damage rate, unreasonable sieve hole design and sieve mesh material problems leading to easy clogging of sieve holes by large soil, affecting the separation effect; at the same time, improper sieve frequency and amplitude can easily cause damage to potatoes during shaking, affecting the final harvesting quality and efficiency. SUMMARY

[0004] The utility model aims at overcoming the above-mentioned problems, and provides a potato harvester. To achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0005] A potato harvester, comprising a rack, a soil shaking mechanism, a transportation mechanism, a transmission mechanism and a power mechanism; the soil shaking mechanism is fixed below the rack; the transmission mechanism is fixed outside the rack; the power mechanism is arranged above the rack; the inside of the rack is provided with a transportation mechanism arranged obliquely; the rack further comprises a rear wheel fixed to the bottom end of the rack.

[0006] The rack is the basic frame of the whole machine, supporting all other components. The bottom of the rack is fixed with a rear wheel, which is used to support the machine and assist in traveling. The soil shaking mechanism is fixed below the rack, responsible for shaking the soil falling from the excavated potatoes to the field. The transportation mechanism is fixed inside the rack and arranged obliquely, used to transport the separated potatoes to the rear end of the machine and shake the soil on the potatoes to the soil shaking mechanism during transportation. The transmission mechanism is fixed outside the rack, responsible for transmitting power from the power mechanism to each executing mechanism. The power mechanism is fixed above the rack, providing power support for the whole machine.

[0007] As an improvement, the transport mechanism includes a driven wheel, a first chain, a first sprocket, a rear slat plate and several screen rods; the gear of the first sprocket is engaged with the first chain; the first sprocket and the driven wheel are chain-driven; the driven wheel is fixed on the inside of the frame; the two ends of the screen rod are respectively connected to the first chain, and several of the screen rods are arranged in sequence front and back to form a ring structure; the rear slat plate is fixed to the end of the frame.

[0008] The driven wheel supports and guides the movement of the first chain, which connects the driven wheel and the first sprocket to form a closed loop. Several sieve bars are fixed to the first chain. The first sprocket transmits power to the driven wheel via a chain drive, which in turn drives the sieve bars. During this movement, the sieve bars carry the potatoes upward while shaking off any dirt. The rear slats are designed to prevent potatoes from falling due to the rapid rotation of the sieve bars during transportation.

[0009] The frame consists of a left and right side panels and a soil feeder. The soil feeder is positioned diagonally in front of the frame, with its ends connected to the left and right sides, respectively. This diagonal placement allows the soil feeder to effectively cut into the soil, reducing resistance and making it easier to dig out potatoes. The center of the soil feeder is in close contact with the sieve bar, ensuring that potatoes are smoothly fed onto the sieve bar during digging, improving digging and conveying efficiency.

[0010] As an improvement, the soil shaking mechanism includes a lower screen frame, a connecting rod mechanism, a rear connecting rod and a rear baffle; the front end of the lower screen frame is rotatably connected to the connecting rod mechanism; the upper end of the rear connecting rod is rotatably connected to the frame, and the lower end is rotatably connected to the rear end of the lower screen frame, and the rear baffle is arranged on the rear side of the lower screen frame and the top of the rear baffle is fixed to the bottom of the frame.

[0011] The lower screen frame further separates small potatoes from the soil after they fall through the sieve bars using a mesh structure. The mesh features numerous small holes, allowing fine soil particles to pass through while retaining larger potatoes. A rear baffle prevents the separated soil and potatoes from falling out of the rear end, ensuring they can enter the transport mechanism smoothly.

[0012] As an improvement, the connecting rod mechanism includes a connecting plate, a connecting rod, a connecting rod pulley, an eccentric disk and a connecting plate shaft; the lower end of the connecting plate is connected to the lower screen frame; the upper end of the connecting plate is hinged to the connecting rod; the other end of the connecting rod is connected to the eccentric disk pin shaft; the middle part of the connecting rod pulley is embedded in the connecting plate shaft; the two ends of the connecting plate shaft are respectively inserted into the eccentric disk and fixed above the frame through bearings.

[0013] The screen frame is driven by the connecting rod mechanism to make reciprocating motion, and the soil and potatoes on the screen are separated by this motion. The power mechanism transmits power to the connecting rod pulley through the belt, the connecting rod pulley drives the connecting plate shaft to rotate, the rotation of the connecting plate shaft drives the eccentric disc to rotate, and the eccentric force is generated due to the uneven mass distribution of the eccentric disc, which drives the connecting rod to reciprocate, and the reciprocating motion of the connecting rod is transmitted to the connecting plate through the hinge point, and the connecting plate transmits the motion to the lower screen frame.

[0014] The power mechanism includes a gearbox, a large pulley and a second sprocket; the gearbox is a bidirectional power output gearbox, one side of which is connected to the large pulley through the belt and the pulley at the end of the power output shaft, and the other side of the power output end is connected to the connecting rod pulley through the belt and the pulley, and the second sprocket is arranged on one side of the pulley of the power output end.

[0015] The gearbox receives power from an external power source (such as a tractor) and reduces and distributes the power to ensure that different actuators can obtain appropriate rotational speed and torque. The large pulley transmits power to the first sprocket in the conveying mechanism through the belt drive.

[0016] As an improvement, the conveying mechanism includes a sprocket mechanism, a pull rod mechanism, a bevel gear mechanism and a side roller mechanism; the sprocket mechanism is fixed to the right side plate of the frame through a bearing; the pull rod mechanism is fixed above the frame; the bevel gear mechanism is fixed to the frame through a bearing; and the side roller mechanism is fixed to the front end of the frame.

[0017] The sprocket mechanism includes a third sprocket, a second chain and a fourth sprocket; the third sprocket is arranged outside the right side plate and is rotatably connected thereto, and the fourth sprocket is coaxially connected to the first sprocket outside the right side plate; the third sprocket is chain-driven by the second chain and the fourth sprocket. The pull rod mechanism includes an outer connecting plate and pull rods; the outer connecting plate and two symmetrically arranged pull rods are connected by bolts; the bottom of the outer connecting plate is fixed to the top of the front end of the frame, and the rear end of the pull rod is connected to the top of the middle of the frame.

[0018] The pull rod mechanism transmits power to the components that need to be driven through mechanical connection, ensuring that each component can work in coordination.

[0019] As an improvement, the bevel gear mechanism comprises a fifth sprocket, a bevel gear shaft, a fourth chain, a first bevel gear and a second bevel gear; the fifth sprocket and the second sprocket are chain driven by the fourth chain; the fifth sprocket is embedded with the bevel gear shaft; the bevel gear shaft is connected with the first bevel gear at both ends; the first bevel gear is engaged with the second bevel gear; and the bottom end of the second bevel gear is connected with the side roller mechanism. The bevel gear mechanism changes the transmission direction of the power, converts the horizontal power into the vertical power, and the power is transmitted to the first bevel gear through the input shaft, and the first bevel gear transmits the power to the second bevel gear through engagement, so that the transmission direction of the power is changed.

[0020] The side roller mechanism comprises a side roller sheath, a side roller, a side roller sheath knife, a side roller shaft and a side roller bearing seat; the side roller sheath covers the upper end of the side roller; the side roller sheath knife covers the lower end of the side roller; the side roller shaft is connected with the side roller bearing seat and the side roller at the upper and lower ends respectively; and the upper end of the side roller bearing seat is connected with the second bevel gear.

[0021] The side roller mechanism ensures that the potatoes can be smoothly transported from the front end of the frame to the rear end through the rotation of the roller.

[0022] The utility model discloses a kind of potato harvesters, which comprises frame, input shaft, first sprocket, second sprocket, third sprocket, fourth sprocket, fifth sprocket, first bevel gear, second bevel gear, side roller mechanism, transport mechanism and chain wheel mechanism.

[0023] 1, the utility model discloses a continuous rotation of screen rod transports potato to the rear end of frame, not only can effectively shake off the soil on the surface of potato;Small potato can also be prevented from falling by small gap screen frame, the integrity and quality of potato are guaranteed.

[0024] 2, the utility model discloses by using gearbox adjustment screen motion frequency and amplitude to more reasonable range, and using more soft material or structure design, reduce the collision and friction of potato in separation process, significantly reduce the damage rate of potato. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a kind of structural schematic diagram of potato harvester.

[0026] Figure 2 It is a kind of structural schematic diagram of frame in embodiment.

[0027] Figure 3 It is a kind of structural schematic diagram of soil shaking mechanism in embodiment.

[0028] Figure 4 It is a kind of structural schematic diagram of transport mechanism in embodiment.

[0029] Figure 5 It is a kind of structural schematic diagram of sprocket mechanism in embodiment.

[0030] Figure 6Structure schematic view of the bevel gear mechanism in the embodiment.

[0031] Figure 7 Structure schematic view of the pull rod mechanism in the embodiment.

[0032] Figure 8 Structure schematic view of the power mechanism in the embodiment.

[0033] Figure 9 Structure schematic view of the side roller mechanism in the embodiment.

[0034] Identified as in the figure:

[0035] 1, frame; 11, left side plate; 12, right side plate; 13, earth cutting tool; 2, soil shaking mechanism; 21, lower sieve frame; 22, connecting rod mechanism; 221, connecting plate; 222, connecting rod; 223, connecting rod pulley; 224, eccentric disc; 225, connecting plate shaft; 23, rear baffle; 24, rear connecting rod; 3, conveying mechanism; 31, driven wheel; 32, first chain; 33, first sprocket; 34, rear thinning plate; 35, sieve rod;

[0036] 4, conveying mechanism; 41, chain wheel mechanism; 411, third sprocket; 412, second chain; 413, fourth sprocket; 42, pull rod mechanism; 421, outer connecting plate; 422, pull rod; 43, bevel gear mechanism; 431, fifth sprocket; 432, bevel gear shaft; 433, fourth chain; 434, first bevel gear; 435, second bevel gear; 44, side roller mechanism; 441, side roller sleeve; 442, side roller; 443, side roller guard; 444, side roller shaft; 445, side roller bearing seat; 5, power mechanism; 51, gearbox; 52, large pulley; 53, second sprocket; 6, rear wheel. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0038] In the description of the embodiments of the utility model, it needs to be explained that, if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly used when the utility model product is used, only for the convenience of describing the utility model and simplifying the description, and it does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, therefore it cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", "third" and the like are only used for differentiation in description, and cannot be understood as indicating or implying relative importance.

[0039] In addition, if the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components must be absolutely horizontal or overhanging, but can be slightly inclined. For example, "horizontal" only means that its direction is relatively more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0040] In the description of the embodiments of the utility model, "multiple" represents at least 2.

[0041] In the description of the embodiments of the utility model, it also needs to be explained that, unless otherwise explicitly specified and limited, if the terms "set", "install", "connect", "connect" appear, they should be understood in a broad sense, for example, they can be fixedly connected, or they can be integrally connected; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0042] The utility model will be described in detail and specifically through specific embodiments, so that the utility model can be better understood, but the following embodiments do not limit the protection scope of the utility model.

[0043] Embodiment

[0044] A potato harvester, including frame 1, soil shaking mechanism 2, transport mechanism 3, transmission mechanism 4 and power mechanism 5, soil shaking mechanism 2 is fixed below frame 1, transmission mechanism 4 is fixed to the outside of frame 1, power mechanism 5 is arranged above frame 1, the inside of frame 1 is equipped with the transport mechanism 3 of setting obliquely, frame 1 still includes rear wheel 6 fixed to the bottom end of frame 1.

[0045] The frame 1 is the base frame of the whole machine, supporting all other components. The rear wheel 6 is fixed at the bottom of the frame 1, used to support the machine and assist in traveling. The soil shaking mechanism 2 is fixed below the frame 1, responsible for shaking the soil off the potatoes that have fallen onto the field and can sieve the small potatoes that have fallen onto the transport mechanism 3. The transport mechanism 3 is fixed inside the frame 1, arranged obliquely, used to transport the separated potatoes to the rear end of the machine. The transmission mechanism 4 is fixed outside the frame 1, responsible for transmitting power from the power mechanism 5 to each executing mechanism. The power mechanism 5 is fixed above the frame 1, providing power support for the whole machine.

[0046] As an improvement, the transport mechanism 3 includes a driven wheel 31, a first chain 32, a first sprocket 33, a rear ridge board 34 and a sieve rod 35; the gear of the first sprocket 33 engages with the first chain 32; the first sprocket 33 and the driven wheel 31 are chain driven; the driven wheel 31 is fixed inside the frame 1; the sieve rod 35 is connected to the first chain 32 at both ends, and a plurality of sieve rods 35 are arranged in a ring structure; the rear ridge board 34 is fixed at the end of the frame 1.

[0047] The driven wheel 31 is used to support and guide the movement of the first chain 32, and the first chain 32 connects the driven wheel 31 and the first sprocket 33 to form a closed ring structure. A plurality of sieve rods 35 are fixed on the first chain 32, and the first sprocket 33 transmits power to the driven wheel 31 through chain transmission, thereby driving the movement of the sieve rod 35. The sieve rod 35 carries the potatoes upward during movement and shakes off the soil on the potatoes. The design of the rear ridge board 34 prevents the potatoes from flying off during transportation due to the excessive speed of the sieve rod 35 rotating.

[0048] The frame 1 includes a left side plate 11, a right side plate 12 and an earth entering cutter 13; the earth entering cutter 13 is obliquely arranged in front of the frame 1, and the earth entering cutter 13 is connected to the left side plate 11 and the right side plate 12 at both ends. The oblique arrangement of the earth entering cutter 13 in front of the frame 1 can effectively cut into the soil, reducing resistance and making it easier to dig out the potatoes. The middle part of the earth entering cutter 13 is close to the sieve rod 35, ensuring that the sieve rod 35 can move synchronously with the earth entering cutter 13 during digging, improving the efficiency of digging and conveying.

[0049] As an improvement, the soil shaking mechanism 2 includes a lower sieve frame 21, a connecting rod mechanism 22, a rear baffle 23 and a rear connecting rod 24; the lower sieve frame 21 is rotatably connected to the front end of the connecting rod mechanism 22; the rear connecting rod 24 is rotatably connected to the upper end of the frame 1 and the lower end of the lower sieve frame 21; the rear baffle 23 is arranged on the rear side of the lower sieve frame 21 and the top of the rear baffle 23 is fixed on the bottom of the frame 1.

[0050] The lower sieve frame 21 further separates the potatoes from the soil by the sieve structure. The sieve has many small holes that allow the fine soil particles to pass through, while the larger potatoes are retained on the sieve. The back baffle 23 prevents the separated soil and potatoes from falling out of the back end, ensuring that they can smoothly enter the transport mechanism.

[0051] As an improvement, the connecting rod mechanism 22 includes a connecting plate 221, a connecting rod 222, a connecting rod pulley 223, an eccentric disc 224, and a connecting plate shaft 225; the lower end of the connecting plate 221 is connected to the lower sieve frame 21; the upper end of the connecting plate 221 is hinged to one end of the connecting rod 222; the other end of the connecting rod 222 is connected to the eccentric disc 224 by a pin shaft; the middle part of the connecting rod pulley 223 is embedded with the connecting plate shaft 225; the two ends of the connecting plate shaft 225 are inserted into the eccentric disc 224, and are fixed to the upper part of the frame 1 by bearings.

[0052] The connecting rod mechanism 22 drives the lower sieve frame 21 to perform reciprocating motion, which separates the soil and potatoes on the sieve. The power mechanism 5 transmits power to the connecting rod pulley 223 through the belt, which drives the connecting plate shaft 225 to rotate, and the rotation of the connecting plate shaft 225 drives the eccentric disc 224 to rotate. Due to the uneven mass distribution of the eccentric disc 224, its rotation will generate eccentric force, which will push the connecting rod to perform reciprocating motion. The reciprocating motion of the connecting rod is transmitted to the connecting plate 221 through the hinge point, and the connecting plate 221 transmits this motion to the lower sieve frame 21.

[0053] As an improvement, the power mechanism 5 includes a gearbox 51, a large pulley 52, and a second sprocket 53; the gearbox 51 is a bidirectional power output gearbox, one side of which is connected to the large pulley 52 through a belt and a pulley at the end of the power output shaft, and the other side of which is connected to the connecting rod pulley 223 through a belt and a pulley at the power output end, and the second sprocket 53 is arranged on one side of the pulley at the power output end.

[0054] The gearbox 51 receives power from an external power source (such as a tractor) and reduces and distributes the power, ensuring that different execution mechanisms can obtain appropriate rotational speed and torque. The large pulley 52 transmits power to the first sprocket 33 in the transport mechanism 3 through the belt drive.

[0055] As an improvement, the transmission mechanism 4 includes a sprocket mechanism 41, a pull rod mechanism 42, a bevel gear mechanism 43, and a side roller mechanism 44; the sprocket mechanism 41 is fixed to the right side plate 12 of the frame 1 by bearings; the pull rod mechanism 42 is fixed to the upper part of the frame 1; the bevel gear mechanism 43 is fixed to the frame 1 by bearings; and the side roller mechanism 44 is fixed to the front end of the frame 1.

[0056] As an improvement, the sprocket mechanism 41 comprises a third sprocket 411, a second chain 412 and a fourth sprocket 413; the third sprocket 411 is arranged outside the right side plate 12 and is rotationally connected thereto, the fourth sprocket 413 is arranged outside the right side plate 12 and is coaxially connected with the first sprocket 33, the third sprocket 411 is chain-driven with the fourth sprocket 413 through the second chain 412. The power is transmitted to the third sprocket 411 through the second sprocket 53, and the third sprocket 411 transmits the power to the fourth sprocket 413 through the second chain 412.

[0057] The pull rod mechanism 42 comprises an outer connecting plate 421 and a pull rod 422; the outer connecting plate 421 and the two symmetrically arranged pull rods 422 are connected by bolts, the bottom of the outer connecting plate 421 is fixed to the top of the front end of the rack 1, and the rear end of the pull rod 422 is connected to the top of the middle of the rack 1.

[0058] The pull rod mechanism 42 transmits power to the components that need to be driven through mechanical connection, ensuring that each component can work in coordination.

[0059] As an improvement, the bevel gear mechanism 43 comprises a fifth sprocket 431, a bevel gear shaft 432, a fourth chain 433, a first bevel gear 434 and a second bevel gear 435; the fifth sprocket 431 is chain-driven with the second sprocket 54 through the fourth chain 433; the fifth sprocket 431 is embedded with the bevel gear shaft 432 inside; the bevel gear shaft 432 is connected with the first bevel gear 434 at both ends respectively; the first bevel gear 434 is meshed with the second bevel gear 435; the bottom end of the second bevel gear 435 is connected with the side roller mechanism 44. The bevel gear mechanism 43 changes the direction of power transmission, converting horizontal power into vertical power. The power is transmitted to the first bevel gear 434 through the input shaft, and the first bevel gear 434 transmits the power to the second bevel gear 435 through meshing, thereby changing the direction of power transmission.

[0060] As an improvement, the side roller mechanism 44 comprises a side roller sheath 441, a side roller 442, a side roller sheath knife 443, a side roller shaft 444 and a side roller bearing seat 445; the side roller sheath 441 covers the upper end of the side roller 442; the side roller sheath knife 443 covers the lower end of the side roller 442; the side roller shaft 444 is connected with the side roller bearing seat 445 and the side roller 442 at the upper and lower ends respectively; the upper end of the side roller bearing seat 445 is connected with the second bevel gear 435. The side roller mechanism 44 ensures that the potatoes can be smoothly transported from the front end of the rack 1 to the rear end through the rotation of the roller.

[0061] The utility model discloses through the innovative screen rod structure, gearbox adjusting mechanism and the optimized power transmission system, realized the efficient and gentle potato excavation and separation process, significantly improved work efficiency and product quality, reduced labor intensity and resource waste simultaneously, not only promoted the speed and integrity of potato harvest, strengthened the adaptability and maintenance convenience of equipment under different soil conditions, provided strong support for modern agricultural production.

[0062] The above detailed description of the specific embodiments of the utility model, but it is only as an example, the utility model is not equivalent to the above described specific embodiments. For those skilled in the art, any equivalent modification and replacement to the utility model are also within the scope of the utility model. Therefore, equivalent transformation and modification made without departing from the spirit and scope of the utility model should be covered in the scope of the utility model.

Claims

1. A potato harvester characterised in that: The utility model provides a soil loosening and transporting machine, including frame, soil loosening mechanism, transport mechanism, transmission mechanism and power mechanism, soil loosening mechanism is fixed below frame, transmission mechanism is fixed outside frame, power mechanism is equipped with above frame, the inside of frame is equipped with the transport mechanism of setting obliquely, frame still includes rear wheel fixed in the bottom end of frame, The transport mechanism includes a driven wheel, a first chain, a first sprocket, a rear thinning plate, and a plurality of screen rods. The gear of the first sprocket engages with the first chain. The first sprocket and the driven wheel are chain-driven. The driven wheel is fixed inside the frame. The two ends of the screen rod are respectively connected to the first chain. A plurality of screen rods are arranged in sequence to form a ring structure. The rear thinning plate is fixed at the end of the frame.

2. A potato harvester according to claim 1, characterised in that: The frame includes a left side plate, a right side plate, and a soil entering cutter. The soil entering cutter is obliquely arranged in front of the frame. The two ends of the soil entering cutter are respectively connected to the left side plate and the right side plate.

3. A potato harvester as claimed in claim 2, characterised in that: The soil loosening mechanism includes a lower screen frame, a connecting rod mechanism, a rear connecting rod, and a rear baffle. The front end of the lower screen frame is rotationally connected to the connecting rod mechanism. The upper end of the rear connecting rod is rotationally connected to the frame, and the lower end is rotationally connected to the rear end of the lower screen frame. The rear baffle is arranged on the rear side of the lower screen frame and is fixed at the top of the frame.

4. A potato harvester according to claim 3, characterized in that: The connecting rod mechanism includes a connecting plate, a connecting rod, a connecting rod pulley, an eccentric disc, and a connecting plate shaft. The lower end of the connecting plate is connected to the lower screen frame. The upper end of the connecting plate is hingedly connected to one end of the connecting rod. The other end of the connecting rod is connected to the pin shaft of the eccentric disc. The connecting rod pulley is embedded in the connecting plate shaft in the middle. The two ends of the connecting plate shaft are respectively inserted into the eccentric disc and fixed to the frame above through bearings.

5. A potato harvester as claimed in claim 4, characterised in that: The power mechanism includes a gearbox, a large pulley, and a second sprocket. The gearbox is a bidirectional power output gearbox. One side of the gearbox is connected to the large pulley through a belt and a belt pulley at the end of the power output shaft. The other side of the gearbox is connected to the connecting rod pulley through a belt and a belt pulley at the power output end. The second sprocket is arranged on one side of the belt pulley at the power output end.

6. A potato harvester as claimed in claim 5 wherein: The transmission mechanism includes a sprocket mechanism, a pull rod mechanism, a bevel gear mechanism, and a side roller mechanism. The sprocket mechanism is fixed to the right side plate of the frame through bearings. The pull rod mechanism is fixed above the frame. The bevel gear mechanism is fixed to the frame through bearings. The side roller mechanism is fixed at the front end of the frame.

7. A potato harvester according to claim 6, characterised in that: The sprocket mechanism includes a third sprocket, a second chain, and a fourth sprocket. The third sprocket is arranged outside the right side plate and rotationally connected thereto. The fourth sprocket is arranged outside the right side plate and coaxially connected to the first sprocket. The third sprocket is chain-driven with the fourth sprocket through the second chain.

8. A potato harvester as claimed in claim 6 wherein: The pull rod mechanism includes an outer connecting plate and pull rods. The outer connecting plate is connected to the two symmetrically arranged pull rods through bolts. The bottom of the outer connecting plate is fixed to the top of the front end of the frame. The rear end of the pull rod is connected to the top of the middle of the frame.

9. A potato harvester as claimed in claim 6 wherein: The bevel gear mechanism includes a fifth sprocket, a bevel gear shaft, a fourth chain, a first bevel gear, and a second bevel gear. The fifth sprocket is chain-driven with the second sprocket through the fourth chain. The fifth sprocket is embedded with the bevel gear shaft inside. The bevel gear shaft is connected to the first bevel gear at both ends. The first bevel gear is meshed with the second bevel gear. The bottom end of the second bevel gear is connected to the side roller mechanism.

10. A potato harvester as claimed in claim 6 wherein: The side roller mechanism comprises a side roller sheath, a side roller, a side roller knife sheath, a side roller shaft and a side roller bearing seat; the side roller sheath covers the upper end of the side roller; the side roller knife sheath covers the lower end of the side roller; the upper and lower ends of the side roller shaft are connected with the side roller bearing seat and the side roller respectively; and the upper end of the side roller bearing seat is connected with the second bevel gear.

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