CN111406491A

CN111406491A - Sweet potato harvester

Info

Publication number: CN111406491A
Application number: CN202010344522.9A
Authority: CN
Inventors: 刘芳梅
Original assignee: Hubei University of Science and Technology
Current assignee: Hubei University of Science and Technology
Priority date: 2020-04-27
Filing date: 2020-04-27
Publication date: 2020-07-14
Anticipated expiration: 2040-04-27
Also published as: CN111406491B

Abstract

The invention provides a sweet potato harvester, and belongs to the technical field of agricultural machinery. This harvester includes the frame, drive wheel and directive wheel, the frame front end is provided with the earth's surface and reaps the unit, it reaps the unit to be provided with the soil turning between drive wheel and the drive wheel, the drive wheel links to each other with the frame by a drive shaft, the earth's surface reaps the unit and includes first installation axle, the davit, carding wheel and shearing wheel, the carding wheel includes the shovel arm of circumference evenly distributed outside first installation axle, the front end of shovel arm has a plurality of broach that runs through the shovel arm tip, shearing wheel includes a plurality of arcs, with the shearing blade of shovel arm one-to-one, the front end of shearing blade has one to keeping away from the atress blend stop that first installation axle axis direction stretches out, the rear end of shearing blade has the shearing sword, be connected with a reset spring who orders about the front end of shearing blade and the tip alignment. The invention has the advantages of orderly harvesting vine leaves and the like.

Description

Sweet potato harvester

Technical Field

The invention belongs to the technical field of agricultural machinery, and relates to a sweet potato harvester.

Background

The sweet potato is a crop with high starch content, in recent years, with the continuous pursuit of people for food diversification, vine leaves of the sweet potato also become delicious vegetables on dining tables of people gradually, the traditional sweet potato harvester needs to harvest the vine leaves manually if the vine leaves need to be reserved, then the root parts of stems are separated from soil in a soil turning mode, the value utilization of sweet potato planting is not facilitated, and the vine leaves of the sweet potato are distributed on the ground surface in a messy mode, the roots of the vine leaves are luxuriant, and the harvesting difficulty of a machine is high.

Disclosure of Invention

The invention aims to provide a sweet potato harvester aiming at the problems in the prior art, and the technical problem to be solved by the invention is how to orderly harvest vine leaves of sweet potatoes.

The purpose of the invention can be realized by the following technical scheme: a sweet potato harvester is characterized by comprising a frame, a driving wheel and a steering wheel, wherein a ground surface harvesting unit is arranged at the front end of the frame, a soil turning harvesting unit is arranged between the driving wheel and the driving wheel, the driving wheel is connected with the frame through a driving shaft, the ground surface harvesting unit comprises a first mounting shaft, a suspension arm, a combing wheel and a shearing wheel, the combing wheel is fixed on the first mounting shaft, one end of the suspension arm is rotatably connected with the first mounting shaft, the other end of the suspension arm is connected with the frame, a first gear is fixedly arranged on the driving shaft, a second gear meshed with the first gear is rotatably connected on the frame, the second gear is connected with the first mounting shaft through a belt, the combing wheel comprises shovel arms which are uniformly distributed outside the first mounting shaft in the circumferential direction, and a plurality of comb teeth penetrating through the end parts of the shovel arms are arranged at the front ends of the shovel arms, the shearing wheel includes a plurality of curved, with the shearing blade of arm one-to-one, links to each other at the linking arm of combing two straight terminal surfaces of wheel through setting up between the adjacent shearing blade, shearing blade sliding connection is at the surface of arm, forms one between the adjacent arm and dodges the mouth, the front end of shearing blade has one to keeping away from the atress blend stop that first installation axle axis direction stretches out, the rear end of shearing blade has the shearing sword, be connected with a reset spring who orders about the front end of shearing blade and the tip alignment of broach between linking arm and the arm.

Frame, drive wheel, directive wheel and relevant accessory constitute a walking unit, and this part is current conventional means, does not give unnecessary details here, and this walking unit is the rear wheel steering, and the technical scheme of this application only utilizes the rotary driving power of drive wheel to provide the power source of earth's surface harvesting unit and the harvesting unit that digs.

The working principle is as follows: the carding wheel and the shearing wheel are arranged on the ridge part higher than the bottom of the driving wheel, the driving wheel rotates, the frame moves, the carding wheel is in a composite motion state of translation and rotation, a gap between the front end and the tail end of the shovel arm provides a space for the comb teeth at the front end of the shovel arm to be in contact with the sweet potato roots above the ground surface, a hollow groove is formed between the heart spirit shovel arms and is used for allowing part of the sweet potato roots to be temporarily stored at the position, the carding wheel moves forwards and flatly to comb the sweet potato roots between the comb teeth, the stressed blocking strips bear ground resistance to drive the whole shearing wheel to rotate reversely relative to the carding wheel, the shearing blade at the rear end of the shearing wheel acts on the sweet potato roots clamped in the gap between the comb teeth to cut the sweet potato roots, and the carding wheel moves along with rotation during translation, so that the sweet potato roots can be pulled upwards before being sheared, the cutting edge is convenient to act, and the vine roots can be pulled up and lifted to the rear of the carding wheel after the carding wheel rotates to be higher than the ground surface, so that the vine roots are prevented from being rolled by the carding wheel, and the middle part of the sweet potato vine roots can be prevented from being rooted in the soil and being incapable of completely separating the vine roots from the ground; when the resistance between the stress barrier strips and the ground surface disappears, namely the sweet potato vine roots are cut, the cutting wheel resets under the action of the reset spring, and the gap between the adjacent shovel arms is opened again, so that the vine roots in the empty grooves between the adjacent shovel arms fall out.

The sweet potatoes are cut off at the connecting parts of the vine roots, so that the soil removal and separation of the sweet potatoes are very facilitated, and the influence on the soil removal of the sweet potatoes caused by messy and mutual traction and knot of the sweet potato vine roots is avoided; moreover, when the roots are raised through carding, the shovel arm is just located at the connecting position of the rattan roots and the soil, and the rattan roots are cut at a position with a distance from the soil during shearing, so long as the planting row spacing and the ratio of the walking speed of the harvester to the rotating speed of the carding wheel are well controlled, the harvester is not influenced by the walking speed of the harvester during harvesting, and the ratio of the walking speed of the harvester to the rotating speed of the carding wheel can be controlled through the wheel diameters of the belt pulley on the first mounting shaft and the belt pulley on the second gear connected with the first mounting shaft.

In the sweet potato harvester, the suspension arm is rotatably connected with the frame, the frame is provided with a hydraulic cylinder, the cylinder body of the hydraulic cylinder is hinged on the frame, and the push rod of the hydraulic cylinder is hinged in the middle of the suspension arm.

The height of the combing wheel can be controlled by stretching and retracting the push rod on the hydraulic cylinder, and the combing wheel is used for adjusting the gap between the combing wheel and the ground surface.

In the sweet potato harvester, the number of teeth of the first gear is greater than that of the second gear, and the rotating speed of the first mounting shaft is lower than that of the second gear.

Through the arrangement of the first gear and the second gear, the rotating speed of the carding wheel is lower than that of the driving wheel, so that the carding process of the carding wheel is longer, and the problem of disorder of the sweet potato vine roots is solved.

In the sweet potato harvester, the soil turning and harvesting unit comprises a soil turning plow and a soil removing and feeding mechanism, the tail end of the soil turning plow is contracted to form a circular feeding port, the soil removing and feeding mechanism comprises a plurality of rotating rods and a second installation shaft, the second installation shaft is rotatably connected to the frame, two ends of the second installation shaft are rotatably connected to the frame, the distances between the rotating rods and the second installation shaft are equal, a feeding groove with the radian smaller than 180 degrees is formed below the second installation shaft by each rotating rod, threaded sleeves made of rubber are sleeved on the rotating rods, gaps allowing scattered soil to pass through exist between adjacent threaded sleeves, a first bevel gear is arranged on the second installation shaft, a second bevel gear meshed with the first bevel gear is arranged on the driving shaft, and a blanking section with the diameter smaller than the diameter of the threaded sleeves is arranged on the rotating rod close to the tail end of the rotating rod, and a transmission assembly for driving each rotating rod to rotate is arranged between the tail end of each rotating rod and the second mounting shaft.

The existing soil turning and harvesting mode is generally a mode of vibration and continuous transmission, has poor soil block dispersing capacity, increases the overall size of the harvester, and is easy to damage sweet potatoes. In this scheme, the soil block that will bury the sweet potato is direct to lead to walking the silo through the plough, walks the silo and comprises a plurality of bull sticks, and the bull stick is rotatory, extrudees and promotes the soil block, and the thread bush that the cover was established on the bull stick can increase the resistance to the soil block, and can peel off the nubby soil that adheres at the sweet potato surface, forms the gap that spills the soil block between the adjacent bull stick, and the jam in this gap can also be avoided in the rotation of bull stick.

In foretell sweet potato harvester, drive assembly includes that one fixes at the epaxial drive gear of second installation, and each bull stick divide into a plurality of transfer lines and a plurality of driven pole, the fixed big footpath ring gear that is provided with on the transfer line, the fixed path ring gear that is provided with on the driven pole, the number of teeth of big footpath ring gear is more than the number of teeth of path ring gear, and the both sides of every transfer line are equallyd divide and are distributed a driven pole respectively, and the big footpath ring gear on the transfer line meshes simultaneously with the path ring gear that is located on the driven pole of its both sides, has the clearance between the adjacent path ring gear, drive gear meshes each big footpath.

If each bull stick turns to the same, then it is less to the extrusion force of soil block, need walk the longer length of silo and just can be better peel off and discharge the soil block, in order to raise the efficiency, divide into groups each bull stick, only the transfer line just receives the drive, and the transfer line both sides set up a passive pole of rotation respectively, so, the direction of rotation that can make arbitrary adjacent bull stick is all opposite, the increase is to the effect of soil, improve and take off native efficiency, also avoid soil and sweet potato to remove to the opening direction of walking the silo simultaneously.

In the sweet potato harvester, the spiral directions of the thread convex ribs on the thread sleeves are the same, the rotating rods are parallel to each other, the rotating rods are parallel to the second mounting shaft, and an inclination angle of 3-5 degrees is formed between the second mounting shaft and the horizontal plane.

The trough that walks that is the inclination setting can avoid the sweet potato to stop for a long time, though subsequent clod can promote its removal, nevertheless still makes the sweet potato blocked by the probability, is damaged by the sweet potato of thread bush effect easily for a long time.

In the sweet potato harvester, the second mounting shaft is fixedly provided with a scraping wheel, and a plurality of scraping rods are uniformly arranged on the scraping wheel in the circumferential direction; and two sides of the scraping wheel are respectively provided with a baffle fixed on the frame.

Scrape the baffle that pole, cooperation are located the scraping wheel both sides, can separate rattan root and sweet potato be connected with the sweet potato, and the sweet potato is scraped by the pole with connecting the rattan root of being connected by the sweet potato, receives the limiting displacement of baffle, and sweet potato and rattan root separate, and the sweet potato falls down, and the rattan root is rolled up outside the trough of walking.

Drawings

Fig. 1 is a schematic structural view of the sweet potato harvester.

Fig. 2 is a schematic structural diagram of the turning and harvesting unit.

Fig. 3 is an enlarged view of a portion a in fig. 1.

Fig. 4 is a sectional view in the direction B-B in fig. 2.

Fig. 5 is a sectional view in the direction C-C in fig. 2.

Fig. 6 is a schematic view of the combing wheel and the cutting wheel in a state before cutting.

Fig. 7 is a schematic view of the combing wheel and the cutting wheel in a state of cutting.

Fig. 8 is a schematic plan view of the plow.

In the figure, 1, a frame; 11. a drive wheel; 12. a steering wheel; 13. a drive shaft; 21. a first mounting shaft; 22. a suspension arm; 23. combing wheels; 231. a shovel arm; 232. comb teeth; 24. a shear wheel; 241. a shearing blade; 242. a force-bearing barrier strip; 243. a cutting edge; 25. a first gear; 26. a second gear; 27. a return spring; 28. a hydraulic cylinder; 29. a connecting arm; 3. a soil turning plow; 31. a rotating rod; 32. a second mounting shaft; 33. a threaded sleeve; 34. a first bevel gear; 35. a second bevel gear; 36. a drive gear; 37. a large-diameter gear ring; 38. a small-diameter gear ring; 41. a scraping wheel; 42. a scraping rod; 43. and a baffle plate.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.

As shown in fig. 1, 3, 6 and 7, the harvester comprises a frame 1, a driving wheel 11 and a steering wheel 12, wherein a ground surface harvesting unit is arranged at the front end of the frame 1, a soil turning harvesting unit is arranged between the driving wheel 11 and the driving wheel, the driving wheel 11 is connected with the frame 1 through a driving shaft 13, the ground surface harvesting unit comprises a first mounting shaft 21, a suspension arm 22, a combing wheel 23 and a shearing wheel 24, the combing wheel 23 is fixed on the first mounting shaft 21, one end of the suspension arm 22 is rotatably connected with the first mounting shaft 21, the other end of the suspension arm 22 is connected with the frame 1, the driving shaft 13 is fixedly provided with a first gear 25, a second gear 26 meshed with the first gear 25 is rotatably connected with the frame 1, the second gear 26 is connected with the first mounting shaft 21 through a belt, the combing wheel 23 comprises shovel arms 231 uniformly distributed outside the first mounting shaft 21 in the circumferential direction, the front ends of the shovel arms 231 are provided with a plurality of comb teeth, the shearing wheel 24 includes a plurality of arc, with the shearing blade 241 of shovel arm 231 one-to-one, link to each other through setting up the linking arm 29 at two straight terminal surfaces of combing wheel 23 between the adjacent shearing blade 241, shearing blade 241 sliding connection is at the surface of shovel arm 231, form one between the adjacent shovel arm 231 and dodge the mouth, the front end of shearing blade 241 has a atress blend stop 242 that stretches out to keeping away from first installation axle 21 axis direction, the rear end of shearing blade 241 has shearing edge 243, be connected with a reset spring 27 that orders about the tip of shearing blade 241 and broach 232 between linking arm 29 and the shovel arm 231 and align.

Frame 1, drive wheel 11, directive wheel 12 and relevant accessory constitute a walking unit, and this part is current conventional means, does not give unnecessary details here, and this walking unit is the rear wheel steering, and the technical scheme of this application only utilizes the rotary driving power of drive wheel 11 to provide the power source of earth's surface harvesting unit and the harvesting unit that digs.

The working principle is as follows: the driving wheel 11 and the steering wheel 12 are arranged at the spaced portion between ridges, the combing wheel 23 and the shearing wheel 24 are arranged at the portion above the ridges higher than the bottom of the driving wheel 11, the driving wheel 11 rotates, the frame 1 moves, the combing wheel 23 is in a combined motion state of translation and rotation, a gap between the front end and the tail end of the shovel arm 231 provides a space for the comb teeth 232 at the front end of the shovel arm 231 to contact with the sweet potato vine roots above the ground surface on one hand, and a hollow groove is formed between the heart-shaped shovel arms 231 for allowing part of the sweet potato vine roots to be temporarily stored at the portion, the combing wheel 23 moves forward and horizontally to comb the sweet potato vine roots between the comb teeth 232, the force-bearing bars 242 receive ground resistance to drive the whole shearing wheel 24 to rotate reversely relative to the combing wheel 23, the shearing edge 243 at the rear end of the shearing wheel 24 acts on the sweet potato roots clamped in the gap between the comb teeth 232 to cut the sweet potato roots, and the combing wheel 23 rotates during translation, the vine roots can be pulled up before the vine roots are cut, so that the cutting edge 243 can be conveniently used, the vine roots can be pulled up and lifted to the rear part of the carding wheel 23 after the carding wheel 23 rotates to a position higher than the ground surface, the carding wheel 23 is prevented from rolling the vine roots, and the middle part of the sweet potato vine roots can be prevented from being rooted in the soil and being incapable of completely separating the vine roots from the ground; when the resistance between the force-bearing barrier strips 242 and the ground surface disappears, namely after the sweet potato vine roots are cut, the cutting wheel 24 is reset under the action of the reset spring 27, and the gap between the adjacent shovel arms 231 is opened again, so that the vine roots in the empty groove between the adjacent shovel arms 231 fall out.

The sweet potatoes are cut off at the connecting parts of the vine roots, so that the soil removal and separation of the sweet potatoes are very facilitated, and the influence on the soil removal of the sweet potatoes caused by messy and mutual traction and knot of the sweet potato vine roots is avoided; moreover, when the roots are combed, the shovel arm 231 is just located at the connecting position of the rattan roots and the soil, and the rattan roots are sheared at a position having a distance from the soil during shearing, so long as the planting row spacing and the ratio of the walking speed of the harvester to the rotating speed of the combing wheel 23 are controlled, the harvester is not influenced by the walking speed of the harvester during harvesting, and the ratio of the walking speed of the harvester to the rotating speed of the combing wheel 23 can be controlled through the wheel diameters of the belt pulley on the first mounting shaft 21 and the belt pulley on the second gear 26 connected with the first mounting shaft.

The suspension arm 22 is rotatably connected with the frame 1, a hydraulic cylinder 28 is arranged on the frame 1, the cylinder body of the hydraulic cylinder 28 is hinged on the frame 1, and the push rod of the hydraulic cylinder 28 is hinged in the middle of the suspension arm 22. The height of the combing wheel 23 can be controlled by the extension and retraction of the push rod on the hydraulic cylinder 28, and the height is used for adjusting the clearance between the combing wheel 23 and the ground surface.

The number of teeth of the first gear 25 is greater than that of the second gear 26, and the rotation speed of the first mounting shaft 21 is lower than that of the second gear 26. The first gear 25 and the second gear 26 are arranged, so that the rotating speed of the carding wheel 23 is lower than that of the driving wheel 11, the carding process of the carding wheel 23 is longer, and the problem of disorder of the sweet potato vine roots is solved.

As shown in fig. 1, 2, 5 and 8, the turning and harvesting unit comprises a turning plow 3 and a soil-removing and feeding mechanism, the tail end of the turning plow 3 contracts to form a circular feeding port, the soil-removing and feeding mechanism comprises a plurality of rotating rods 31 and a second mounting shaft 32, the second mounting shaft 32 is rotatably connected to the frame, two ends of the second mounting shaft 32 are rotatably connected to the frame 1, the distance between each rotating rod 31 and the second mounting shaft 32 is equal, each rotating rod 31 forms a feeding groove with an arc smaller than 180 degrees below the second mounting shaft 32, the rotating rods 31 are sleeved with threaded sleeves 33 made of rubber, a gap allowing scattered soil to pass through is formed between adjacent threaded sleeves 33, a first bevel gear 34 is arranged on the second mounting shaft 32, a second bevel gear 35 meshed with the first bevel gear is arranged on the driving shaft 13, a blanking section with a diameter smaller than that of the threaded sleeves 33 is arranged on the rotating rod 31 close to the tail end of the rotating rod 31, a transmission assembly for driving each rotating rod 31 to rotate is arranged between the tail end of the rotating rod 31 and the second mounting shaft 32.

The existing soil turning and harvesting mode is generally a mode of vibration and continuous transmission, has poor soil block dispersing capacity, increases the overall size of the harvester, and is easy to damage sweet potatoes. In this scheme, the soil block that will bury the sweet potato is direct to lead to away the silo through the native plough 3 in, it comprises a plurality of bull sticks 31 to walk the silo, the bull stick 31 is rotatory, extrude and promote the soil block, the thread bush 33 that the cover was established on the bull stick 31 can increase the resistance to the soil block, and can peel off the nubby soil that adheres at the sweet potato surface, form the gap that spills the soil block between the adjacent bull stick 31, the jam in this gap can also be avoided in the rotation of bull stick 31.

The transmission assembly comprises a driving gear 36 fixed on the second mounting shaft 32, each rotating rod 31 is divided into a plurality of transmission rods and a plurality of driven rods, a large-diameter gear ring 37 is fixedly arranged on each transmission rod, a small-diameter gear ring 38 is fixedly arranged on each driven rod, the number of teeth of the large-diameter gear ring 37 is greater than that of the small-diameter gear ring 38, a driven rod is respectively distributed on each of two sides of each transmission rod, the large-diameter gear ring 37 on each transmission rod is meshed with the small-diameter gear rings 38 on the driven rods on two sides of the transmission rod at the same time, gaps are formed between every two adjacent small-diameter gear rings 38, and the driving gear 36. If each bull stick 31 turns to the same, then it is less to the extrusion force of clod, need walk the longer length of silo and just can be better peel off and discharge the clod, in order to raise the efficiency, divide into groups each bull stick 31, only the transfer line just receives the drive, and the transfer line both sides set up a passive rotatory passive pole respectively, so, can make arbitrary adjacent bull stick 31's direction of rotation all opposite, the increase is to the effect of soil, improve and take off native efficiency, also avoid soil and sweet potato to remove to the opening direction of walking the silo simultaneously.

The spiral directions of the thread convex ribs on the thread sleeves 33 are the same, the rotating rods 31 are parallel to each other, the rotating rods 31 are parallel to the second mounting shaft 32, and an inclination angle of 3-5 degrees is formed between the second mounting shaft 32 and the horizontal plane. The trough that walks that is the inclination setting can avoid the sweet potato to stop for a long time, though subsequent clod can promote its removal, nevertheless still makes the sweet potato blocked by the probability, is damaged by the sweet potato of thread bush 33 effect for a long time easily.

A scraping wheel 41 is fixedly arranged on the second mounting shaft 32, and a plurality of scraping rods 42 are uniformly arranged on the scraping wheel 41 in the circumferential direction; the two sides of the scraping wheel 41 are respectively provided with a baffle 43 fixed on the frame 1. Scrape the baffle 43 that pole 42, cooperation are located scraping 41 both sides, can separate the rattan root and the sweet potato that are connected with the sweet potato, and the sweet potato is scraped by scraping pole 42 with the rattan root of being connected by the sweet potato, receives the limiting displacement of baffle 43, and sweet potato and rattan root separate, and the sweet potato falls down, and the rattan root is rolled up outside walking away the silo.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.

Claims

1. A sweet potato harvester is characterized by comprising a frame (1), a driving wheel (11) and a steering wheel (12), wherein a ground surface harvesting unit is arranged at the front end of the frame (1), a soil turning harvesting unit is arranged between the driving wheel (11) and a driving wheel, the driving wheel (11) is connected with the frame (1) through a driving shaft (13), the ground surface harvesting unit comprises a first mounting shaft (21), a suspension arm (22), a combing wheel (23) and a shearing wheel (24), the combing wheel (23) is fixed on the first mounting shaft (21), one end of the suspension arm (22) is rotatably connected with the first mounting shaft (21), the other end of the suspension arm (22) is connected with the frame (1), a first gear (25) is fixedly arranged on the driving shaft (13), a second gear (26) meshed with the first gear (25) is rotatably connected on the frame (1), the combing wheel (23) comprises a shovel arm (231) which is uniformly distributed in the circumferential direction outside the first installation shaft (21), the front end of the shovel arm (231) is provided with a plurality of comb teeth (232) which penetrate through the end part of the shovel arm (231), the shearing wheel (24) comprises a plurality of arc-shaped shearing blades (241) which correspond to the shovel arm (231) one by one, the adjacent shearing blades (241) are connected through connecting arms (29) which are arranged on two straight end faces of the combing wheel (23), the shearing blades (241) are connected to the outer surface of the shovel arm (231) in a sliding mode, an avoiding opening is formed between the adjacent shovel arms (231), the front end of each shearing blade (241) is provided with a stress barrier strip (242) which stretches out in the direction of keeping away from the axis of the first installation shaft (21), and the rear end of each shearing blade (241) is provided with a shearing edge (243), and a return spring (27) for driving the front end of the shearing blade (241) to be aligned with the end part of the comb teeth (232) is connected between the connecting arm (29) and the shovel arm (231).

2. The sweet potato harvester according to claim 1, characterized in that the boom (22) is rotatably connected with the frame (1), a hydraulic cylinder (28) is arranged on the frame (1), the cylinder body of the hydraulic cylinder (28) is hinged on the frame (1), and the push rod of the hydraulic cylinder (28) is hinged in the middle of the boom (22).

3. The sweet potato harvester according to claim 1 or 2, characterized in that the number of teeth of the first gear (25) is greater than the number of teeth of the second gear (26), and the rotational speed of the first mounting shaft (21) is lower than the rotational speed of the second gear (26).

4. The sweet potato harvester of claim 1 or 2, characterized in that the plowing and harvesting unit comprises a plowing plow (3) and a soil removing and feeding mechanism, the end of the plowing plow (3) shrinks to form a circular feeding port, the soil removing and feeding mechanism comprises a plurality of rotating rods (31) and a second mounting shaft (32), the second mounting shaft (32) is rotatably connected to the frame, two ends of the second mounting shaft (32) are rotatably connected to the frame (1), the distance between each rotating rod (31) and the second mounting shaft (32) is equal, each rotating rod (31) forms a trough with an arc smaller than 180 degrees below the second mounting shaft (32), the rotating rods (31) are sleeved with rubber thread sleeves (33), a gap allowing scattered soil to pass through exists between adjacent thread sleeves (33), the second mounting shaft (32) is provided with a bevel gear I (34), the driving shaft (13) is provided with a second bevel gear (35) meshed with the first bevel gear, the rotating rod (31) close to the tail end of the rotating rod (31) is provided with a blanking section with the diameter smaller than that of the threaded sleeve (33), and a transmission assembly for driving each rotating rod (31) to rotate is arranged between the tail end of the rotating rod (31) and the second mounting shaft (32).

5. The sweet potato harvester of claim 4, characterized in that the transmission component comprises a driving gear (36) fixed on the second mounting shaft (32), each rotating rod (31) is divided into a plurality of transmission rods and a plurality of driven rods, a large-diameter gear ring (37) is fixedly arranged on each transmission rod, a small-diameter gear ring (38) is fixedly arranged on each driven rod, the number of teeth of the large-diameter gear ring (37) is greater than that of the small-diameter gear ring (38), a driven rod is respectively distributed on both sides of each transmission rod, the large-diameter gear rings (37) on the transmission rods are simultaneously meshed with the small-diameter gear rings (38) on the driven rods on both sides of the transmission rods, gaps are formed between the adjacent small-diameter gear rings (38), and the driving gear (36) is simultaneously meshed with the large-diameter gear rings (37).

6. The sweet potato harvester of claim 4, characterized in that the screw thread convex ribs on each screw sleeve (33) have the same screw direction, the rotating rods (31) are parallel to each other, the rotating rods (31) are parallel to the second mounting shaft (32), and the second mounting shaft (32) forms an inclination angle of 3-5 degrees with the horizontal plane.

7. The sweet potato harvester according to claim 4, characterized in that the second mounting shaft (32) is fixedly provided with a scraping wheel (41), and a plurality of scraping rods (42) are uniformly arranged on the scraping wheel (41) along the circumferential direction; two sides of the scraping wheel (41) are respectively provided with a baffle (43) fixed on the frame (1).