A variable-diameter drum type Jerusalem artichoke harvester

Abstract

The present invention discloses a variable-diameter drum type Jerusalem artichoke harvester, which includes a Jerusalem artichoke digging component, a drum component, a residue separation and tuber collection component. The Jerusalem artichoke digging component, the drum component, and the residue separation and tuber collection component are arranged on a frame and connected into a whole by the frame. The Jerusalem artichoke digging component includes a digging shovel arranged at the front end of the frame, a belt crossbar type lifting conveyor that can be conveyed and driven and arranged at the front end of the frame, and an eccentric jitter wheel arranged at the front end of the frame to make the belt crossbar type lifting conveyor jitter up and down. The drum component includes a drum rotatably arranged on the frame, a drum filter screen arranged on the drum, and a spiral ring plate arranged inside the drum filter screen. The residue separation and tuber collection component includes an openable and closable box body arranged at the rear end of the drum, and a receiving groove isolation baffle and a Jerusalem artichoke tuber inclined guide groove are arranged inside the box.

Description

Technical Field

[0001] The present invention relates to the field of agricultural machinery, and particularly to a variable-diameter drum type Jerusalem artichoke harvester. Background Art

[0002] At present, for the mechanized harvesting of Jerusalem artichokes in China, mainly medium and small-sized potato harvesters are used for operation. Their machine structures and operating parameters are all set according to potatoes. However, there are significant differences between Jerusalem artichoke tubers and potato tubers. When a potato harvester is used for Jerusalem artichoke harvesting, the degree of soil block fragmentation is insufficient, and the screening of loose soil is not thorough. When Jerusalem artichoke tubers are laid on the ground, they fall mixed with soil blocks, loose soil, and residual roots, and are covered by soil, making it impossible to effectively carry out subsequent manual picking. At the same time, it is also impossible to completely separate the Jerusalem artichoke tubers from the roots, and they fall together with the residual roots. The smaller-diameter Jerusalem artichoke tubers fall out through the gaps between the spokes of the elevator chain of the potato harvester, resulting in incomplete excavation of the Jerusalem artichoke tubers. Therefore, a Jerusalem artichoke harvester that can solve the above problems is needed for mechanized Jerusalem artichoke harvesting operations. Summary of the Invention

[0003] The purpose of the present invention is to provide a variable-diameter drum type Jerusalem artichoke harvester for the above-mentioned defects of the existing technology, so as to achieve soil fragmentation, screening of loose soil, and effective separation of Jerusalem artichoke tubers from the roots. After harvesting, large cloddy soils, large Jerusalem artichoke residual roots and Jerusalem artichoke tubers are separated. The falling of smaller Jerusalem artichoke tubers through the gaps between the spokes of the elevator chain is reduced, and the excavation rate of smaller Jerusalem artichoke tubers is increased. At the same time, the excavated Jerusalem artichoke tubers are stacked in piles to facilitate subsequent manual picking operations to achieve higher work efficiency.

[0004] To achieve the above purpose, the technical solution of the present invention is:

[0005] A variable-diameter drum type Jerusalem artichoke harvester, including a Jerusalem artichoke excavation component, a drum component, and a waste separation and tuber collection component. The Jerusalem artichoke excavation component, the drum component, and the waste separation and tuber collection component are arranged on a frame and are connected as a whole by the frame;

[0006] The Jerusalem artichoke excavation component includes an excavation shovel arranged at the front end of the frame, a belt crossbar type lifting conveyor that can be conveyed and driven and is arranged at the front end of the frame, and an eccentric jitter wheel arranged at the front end of the frame to make the belt crossbar type lifting conveyor jitter up and down;

[0007] The drum component includes a drum rotatably arranged on the frame, a drum filter screen arranged on the drum, and a spiral ring plate arranged inside the drum filter screen;

[0008] The waste separation and tuber collection component includes an openable and closable box arranged at the rear end of the drum. A receiving groove isolation baffle and a Jerusalem artichoke tuber inclined guide groove are arranged inside the box.

[0009] As an improvement to the above technical solution, the Jerusalem artichoke digging component further includes a belt crossbar type rotating conveyor driving rubber wheel that is drivingly connected to the belt crossbar type lifting conveyor. The belt crossbar type rotating conveyor driving rubber wheel is arranged on the input shaft of the auxiliary gearbox. A main gearbox is arranged at the front end of the frame, and there is a driving connection between the output end of the main gearbox and the input shaft of the auxiliary gearbox.

[0010] As an improvement to the above technical solution, the main gearbox is provided with a main gearbox output end sprocket, and the input shaft of the auxiliary gearbox is provided with an auxiliary gearbox input shaft end sprocket. The main gearbox output end sprocket and the auxiliary gearbox input shaft end sprocket are drivingly connected by a transmission chain.

[0011] As an improvement to the above technical solution, a traction and lifting hanging bracket is arranged at the front end of the frame.

[0012] As an improvement to the above technical solution, the drum component is a variable diameter drum component. The drum is a variable diameter drum. A variable diameter drum rotating shaft is arranged at the center of the variable diameter drum. The drum is connected to the variable diameter drum rotating shaft through a transverse connecting rod and is rotatably arranged on the frame through the variable diameter drum rotating shaft. The variable diameter drum component further includes an auxiliary gearbox arranged on the frame, an auxiliary gearbox power output shaft rotatably arranged on the frame through a bearing bracket, a variable diameter drum driving rubber wheel arranged on the auxiliary gearbox power output shaft, and a variable diameter drum outer driving ring arranged at the front end of the variable diameter drum and adapted to the variable diameter drum driving rubber wheel. The auxiliary gearbox is drivingly connected to the variable diameter drum through the variable diameter drum driving rubber wheel and the variable diameter drum outer driving ring.

[0013] As an improvement to the above technical solution, a large diameter end mounting bracket of the variable diameter drum rotating shaft is arranged at the large end of the variable diameter drum, and a small diameter end mounting bracket of the variable diameter drum rotating shaft is arranged at the small end of the variable diameter drum. The variable diameter drum is rotatably arranged on the frame through the large diameter end mounting bracket of the variable diameter drum rotating shaft and the small diameter end mounting bracket of the variable diameter drum rotating shaft.

[0014] As an improvement to the above technical solution, a variable diameter drum filter screen mounting bracket is arranged on the drum along the circumferential direction. A variable diameter drum filter screen is arranged inside the variable diameter drum filter screen mounting bracket, and a variable diameter spiral ring piece is arranged on the inner circumference of the variable diameter drum filter screen.

[0015] As an improvement to the above technical solution, the box body is composed of a left half receiving groove and a right half receiving groove. The right half receiving groove is arranged at the end of the frame. The left half receiving groove is of an integral structure and is provided with a waste discharge window. A left half receiving groove upper end connecting ring is welded and fixed at the top of the whole left half receiving groove. A frame connecting ring is arranged at the end of the frame. The left half receiving groove is movably connected to the frame through the left half receiving groove upper end connecting ring and the frame connecting ring.

[0016] As an improvement to the above technical solution, the Jerusalem artichoke tuber inclined chute is arranged above the right half chute, and a frame clearance retaining ring is arranged at the tail end of the frame. The frame clearance retaining ring is located between the frame and the small end of the variable-diameter drum and in front of the Jerusalem artichoke tuber inclined chute. An inclined baffle is arranged at the front part of the Jerusalem artichoke tuber inclined chute, and a receiving chute isolation baffle is arranged at the rear part. The receiving chute isolation baffle is located behind the frame clearance retaining ring.

[0017] As an improvement to the above technical solution, there are upturned edges on both sides of the left half receiving chute that intersect parallel to the rear vertical rod of the frame.

[0018] As an improvement to the above technical solution, tires are arranged under the frame.

[0019] Compared with the prior art, the advantages and positive effects of the present invention are:

[0020] The variable-diameter drum type Jerusalem artichoke harvester of the present invention can achieve soil crushing, soil screening, and effective separation of Jerusalem artichoke tubers and roots. After harvesting, large clumped soils, large Jerusalem artichoke residual roots and Jerusalem artichoke tubers are separated. The falling of small Jerusalem artichoke tubers through the gaps between the spokes of the elevating chain is reduced, and the digging rate of small Jerusalem artichoke tubers is improved. At the same time, the excavated Jerusalem artichoke tubers are stacked in piles to facilitate subsequent manual picking operations and achieve higher work efficiency. Brief Description of the Drawings

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0022] Figure 1 It is a right-side view schematic diagram of the structure of the present invention;

[0023] Figure 2 It is a left-side view schematic diagram of the structure of the present invention;

[0024] Figure 3 It is a rear-view schematic diagram of the structure of the present invention;

[0025] Figure 4 It is a schematic diagram of the rear part semi-flipped structure view of the structure of the present invention;

[0026] 1. Frame; 2. Digging shovel; 3. Towing and lifting hanger; 4. Main gearbox; 5. Transmission chain; 6. Sprocket at the output end of the main gearbox; 7. Belt cross-bar type moving conveyor belt; 8. Eccentric jitter wheel; 9. Auxiliary gearbox; 10. Sprocket at the input shaft end of the auxiliary gearbox; 11. Input shaft of the auxiliary gearbox; 12. Driving rubber wheel of the belt cross-bar type lifting conveyor belt; 13. Power output shaft of the auxiliary gearbox; 14. Driving rubber wheel of the variable diameter drum; 15. Outer driving ring of the variable diameter drum; 16. Rotating shaft of the variable diameter drum; 17. Filter mounting bracket of the variable diameter drum; 18. Horizontal connecting rod; 19. Mounting bracket at the large diameter end of the rotating shaft of the variable diameter drum; 20. Filter of the variable diameter drum; 21. Variable diameter spiral ring; 22. Mounting bracket at the small diameter end of the rotating shaft of the variable diameter drum; 23. Gap retaining ring between the variable diameter drum and the frame; 24. Jerusalem artichoke tuber inclined guide groove; 25. Inclined baffle; 26. Left half receiving groove; 27. Right half receiving groove; 28. Partition baffle of the receiving groove; 29. Redundant removal window; 30. Connecting ring at the upper end of the left half receiving groove; 31. Frame connecting ring; 32. Tire; 33. Variable diameter drum. Detailed implementation manner

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work, any modifications, equivalent replacements, improvements, etc., shall be included in the protection scope of the present invention.

[0028] As Figures 1-4 shown, the variable diameter drum type Jerusalem artichoke harvester of the present invention is divided into three parts and connected into a whole through the frame 1. The front part is the Jerusalem artichoke digging part, which is composed of a digging shovel 2, a towing and lifting hanger 3, a main gearbox 4, a transmission chain 5, a sprocket 6 at the output end of the main gearbox, a belt cross-bar type lifting conveyor belt 7, an eccentric jitter wheel 8, a sprocket 10 at the input shaft end of the auxiliary gearbox, an input shaft 11 of the auxiliary gearbox, and a driving rubber wheel 12 of the belt cross-bar type rotating conveyor belt. The front end of the frame 1 is fixedly provided with a towing and lifting hanger 3, which is connected to the tractor drawbar through the towing and lifting hanger 3. The main gearbox 4 is installed in the upper front part of the frame 1 and is connected to the rear power output end of the tractor through the power input shaft. The tractor power is input into the main gearbox 4, driving the sprocket 6 at the output end of the main gearbox to rotate. Driven by the transmission chain 5, the sprocket 10 at the input shaft end of the auxiliary gearbox rotates. The sprocket 10 at the input shaft end of the auxiliary gearbox and the driving rubber wheel 12 of the belt cross-bar type lifting conveyor belt are coaxially fixed on the input shaft 11 of the auxiliary gearbox, driving the belt cross-bar type rotating conveyor belt 7 to move. At the same time, the belt cross-bar type lifting conveyor belt 7 drives the eccentric jitter wheel 8 to rotate eccentrically, causing the belt cross-bar type lifting conveyor belt 7 to vibrate up and down, obliquely transporting the Jerusalem artichokes and soil dug up by the digging shovel 2 upward, and realizing the functions of partial soil fragmentation and soil leakage along with the up and down vibration.

[0029] The main transmission 4 of the tractor power input drives the sprocket 6 at the output end of the main transmission to rotate. Through the transmission chain 5, it drives the sprocket 10 at the input shaft end of the auxiliary transmission to rotate. The sprocket 10 at the input shaft end of the auxiliary transmission is coaxial with the rubber wheel 12 that drives the belt cross-bar type lifting conveyor, driving the belt cross-bar type rotating conveyor 7 to move. The Jerusalem artichokes and soil excavated by the digging shovel 2 are conveyed obliquely upward. At the same time, the belt cross-bar type lifting conveyor 7 drives the eccentric jitter wheel 8 to rotate eccentrically, causing the belt cross-bar type lifting conveyor 7 to jitter up and down, realizing the function of partial soil crushing and soil leakage. The gap between the cross-bars on the belt cross-bar type lifting conveyor 7 is adjusted according to the diameter of the Jerusalem artichoke, so that the smaller diameter Jerusalem artichoke tubers cannot fall out through the gap between the cross-bars of the harvester belt cross-bar type lifting conveyor 7.

[0030] The middle part of the whole machine is the variable-diameter drum part. It consists of a variable-diameter drum 33, an auxiliary transmission 9, a rubber wheel 14 for driving the variable-diameter drum, an outer drive ring 15 of the variable-diameter drum, a rotating shaft 16 of the variable-diameter drum, a mounting frame 17 for the filter screen of the variable-diameter drum, a transverse connecting rod 18, a mounting frame 19 at the large-diameter end of the rotating shaft of the variable-diameter drum, a filter screen 20 of the variable-diameter drum, a variable-diameter spiral ring 21, and a mounting frame 22 at the small-diameter end of the rotating shaft of the variable-diameter drum. The outer drive ring 15 of the variable-diameter drum is fixedly welded to the front end of the mounting frame 17 for the filter screen of the variable-diameter drum. The filter screen 20 of the variable-diameter drum is fixedly welded to the inner side of the mounting frame 17 for the filter screen of the variable-diameter drum. The variable-diameter spiral ring 21 is welded to the filter screen 20 of the variable-diameter drum to form an integral body. The transverse connecting rod 18 is fixedly welded to the rotating shaft 16 of the variable-diameter drum, and the transverse connecting rod 18 is also welded to the filter screen 20 of the variable-diameter drum and the mounting frame 17 for the filter screen of the variable-diameter drum to form the variable-diameter drum 33. The mounting frame 19 at the large-diameter end of the rotating shaft of the variable-diameter drum and the mounting frame 22 at the small-diameter end of the rotating shaft of the variable-diameter drum pass through the rotating shaft 16 of the variable-diameter drum in the bearing holes. The mounting frame 19 at the large-diameter end of the rotating shaft of the variable-diameter drum and the mounting frame 22 at the small-diameter end of the rotating shaft of the variable-diameter drum are part of the frame 1. The position of the variable-diameter drum 33 relative to the frame 1 is fixed, and it rotates with the rotating shaft 16 of the variable-diameter drum as the rotation axis. Here, the variable-diameter drum 33 can also be a non-variable-diameter drum.

[0031] Soil, large Jerusalem artichoke root residues, and Jerusalem artichoke tuber soil clods are fed into the large end of the variable-diameter drum via the belt crossbar type elevator conveyor 7 of the harvester. The variable-diameter drum rotates, and the soil, large Jerusalem artichoke root residues, and Jerusalem artichoke tuber soil clods slide and roll along the spiral channel formed by the variable-diameter spiral ring 21 and the variable-diameter drum filter screen 20 towards the small end of the variable-diameter drum. During this process, they come into contact with and collide with the variable-diameter spiral ring 21 and the variable-diameter drum filter screen 20, further breaking the soil. During the movement towards the small end of the variable-diameter drum, due to the decrease in the drum diameter, the Jerusalem artichoke tubers are subjected to external forces and impacts with changing magnitudes in multiple directions. The Jerusalem artichoke tubers are detached from the large Jerusalem artichoke root residues. At the same time, the loosened soil falls through the filter screen gaps of the variable-diameter drum filter screen 20. The filter screen gaps of the variable-diameter drum filter screen 20 are smaller than the size of the Jerusalem artichoke tubers, so the Jerusalem artichoke tubers do not fall through the filter screen gaps of the variable-diameter drum filter screen 20 but move backward with the unbroken and compacted large soil clods, Jerusalem artichokes, and large root residues, reaching the tail of the small end of the variable-diameter drum.

[0032] The rear part of the whole machine is the part for separating residues and collecting tubers, which is composed of the clearance ring 23 between the small end of the variable-diameter drum 33 and the frame, the inclined guide groove 24 for Jerusalem artichoke tubers, the inclined baffle 25, the left half receiving groove 26, the right half receiving groove 27, the receiving groove isolation baffle 28, the residue discharge window 29, the upper connection ring 30 of the left half receiving groove, and the frame connection ring 31. The clearance ring 23 of the frame is fixed on the frame 1, located between the frame 1 and the small end of the variable-diameter drum 33, to prevent Jerusalem artichoke tubers, large pieces of soil, and large Jerusalem artichoke root residues from falling through the clearance between the frame 1 and the small end of the variable-diameter drum 33. The clearance ring 23 of the frame is lower on the left and higher on the right, so that the residues composed of large pieces of soil and large Jerusalem artichoke root residues and the Jerusalem artichoke tubers slide downward to the inclined guide groove 24 for Jerusalem artichoke tubers. An inclined baffle 25 is installed at a certain height above the inclined guide groove 24 for Jerusalem artichoke tubers. The residues composed of large pieces of soil and large Jerusalem artichoke root residues are blocked by the inclined baffle 25 due to their large volume and slide backward along the inclined baffle 25 and are discharged outside the machine through the residue discharge window 29. There is a receiving groove isolation baffle 28 between the inclined baffle 25 and the inclined guide groove 24 for Jerusalem artichoke tubers to prevent the residues from falling into the left half receiving groove 26. The inclined guide groove 24 for Jerusalem artichoke tubers is connected to the clearance ring 23 between the variable-diameter drum and the frame at the front and the opening of the left half receiving groove 26 at the rear. The inclined guide groove 24 for Jerusalem artichoke tubers, the inclined baffle 25, and the receiving groove isolation baffle 28 of the left half receiving groove 26 are welded into a whole. The volume of Jerusalem artichoke tubers is small, so they fall through the inclined guide groove 24 for Jerusalem artichoke tubers into the left half receiving groove 26 and enter the box body composed of the left half receiving groove 26 and the right half receiving groove 27. The left half receiving groove 26 is of an integral structure with a residue discharge window 29 opened on it. The upper connection ring 30 of the left half receiving groove is welded and fixed at the top of the whole left half receiving groove 26, and the frame connection ring 31 forms a flip-up cover structure for the left half receiving groove 26 through a steel pipe passing through it. There are flanges on both the left and right sides of the left half receiving groove 26 that intersect with the rear vertical rods of the frame 1, and the left half receiving groove 26 is turned downward to play a limiting role. There is a folded edge that turns upward at the lower part of the left half receiving groove 26. When the left half receiving groove 26 is turned downward, it forms a box body with an opening at the upper part with the right half receiving groove 27. When the Jerusalem artichoke tubers fill the box body, the left half receiving groove 26 is turned upward, and a bottom opening appears between the left half receiving groove 26 and the right half receiving groove 27.

[0033] The residue composed of large soil masses and large Jerusalem artichoke root residues and the Jerusalem artichoke tubers slide downward into the Jerusalem artichoke tuber inclined chute 24. The residue composed of large soil masses and large Jerusalem artichoke root residues is blocked by the inclined baffle 25 due to its large volume, slides backward along the inclined baffle 25, and is discharged outside the machine through the residue discharge window 29. The receiving groove isolation baffle 28 below the inclined baffle 25 prevents the residue from falling into the left half receiving groove 26. The Jerusalem artichoke tubers are smaller in volume, so they fall into the box body composed of the left half receiving groove 26 and the right half receiving groove 27 through the Jerusalem artichoke tuber inclined chute 24. The upper connection ring 30 of the left half receiving groove is welded and fixed at the top of the whole left half receiving groove 26, and the machine frame connection ring 31 forms a flip-up cover structure for the left half receiving groove 26 through the steel pipe passing through it. When it is flipped downward, it forms a box body with the right half receiving groove 27. When the Jerusalem artichoke tubers enter the inclined bottom surface of the left half receiving groove 26, the left half receiving groove 26 is tightly fastened to the rear vertical rod of the machine frame 1 under the action of gravity. There are flanges parallel and intersecting with the rear vertical rod of the machine frame 1 on both sides of the left half receiving groove 26, which play a limiting role when the left half receiving groove 26 is flipped downward. When the box body is filled with Jerusalem artichoke tubers, the operator flips up the left half receiving groove 26 with a gripper, and the Jerusalem artichoke tubers in the box body composed of the left half receiving groove 26 and the right half receiving groove 27 slide to the ground through the bottom opening, so as to realize the stacking of Jerusalem artichoke tubers in piles.

Claims

1. A variable-diameter drum type Jerusalem artichoke harvester, characterized in that: It includes a Jerusalem artichoke digging component, a drum component, a residue separation and tuber collection component. The Jerusalem artichoke digging component, the drum component, and the residue separation and tuber collection component are arranged on a frame and connected as a whole by the frame. The Jerusalem artichoke digging component includes a digging shovel arranged at the front end of the frame, a belt crossbar type lifting conveyor belt that can be conveyed and driven and is arranged at the front end of the frame, and an eccentric shaking wheel arranged at the front end of the frame to make the belt crossbar type lifting conveyor belt shake up and down. The drum component is a variable diameter drum component. The drum component includes a drum rotatably arranged on the frame, a drum filter screen arranged on the drum, and a spiral ring plate arranged inside the drum filter screen. The drum is a variable diameter drum. The residue separation and tuber collection component includes an openable and closable box body arranged at the rear end of the drum. A receiving groove isolation baffle and a Jerusalem artichoke tuber inclined guide groove are arranged inside the box body. The box body is composed of a left half receiving groove and a right half receiving groove. The right half receiving groove is arranged at the end of the frame. The left half receiving groove is of an integral structure and has a residue discharge window opened thereon. A left half receiving groove upper connection ring is welded and fixed at the top of the whole left half receiving groove. A frame connection ring is arranged at the tail end of the frame. The left half receiving groove is movably connected to the frame through the left half receiving groove upper connection ring and the frame connection ring. The Jerusalem artichoke tuber inclined guide groove is arranged above the right half groove. A frame clearance retaining ring is arranged at the tail end of the frame. The frame clearance retaining ring is located between the frame and the small end of the variable diameter drum of the variable diameter drum and in front of the Jerusalem artichoke tuber inclined guide groove. An inclined baffle is arranged at the front part of the Jerusalem artichoke tuber inclined guide groove, and a receiving groove isolation baffle is arranged at the rear part. The receiving groove isolation baffle is located behind the frame clearance retaining ring.

2. The variable-diameter drum type Jerusalem artichoke harvester according to claim 1, wherein: The Jerusalem artichoke digging component further includes a belt crossbar type rotating conveyor belt driving rubber wheel that is in transmission connection with the belt crossbar type lifting conveyor belt. The belt crossbar type rotating conveyor belt driving rubber wheel is arranged on the input shaft of the auxiliary gearbox. A main gearbox is arranged at the front end of the frame. There is a transmission connection between the output end of the main gearbox and the input shaft of the auxiliary gearbox. A traction and lifting hanging bracket is also arranged at the front section of the frame.

3. The variable-diameter drum type Jerusalem artichoke harvester according to claim 2, wherein: The main gearbox is provided with a main gearbox output end sprocket, and the input shaft of the auxiliary gearbox is provided with an auxiliary gearbox input shaft end sprocket. The main gearbox output end sprocket and the auxiliary gearbox input shaft end sprocket are in transmission connection through a transmission chain.

4. The variable-diameter drum type Jerusalem artichoke harvester according to claim 1, characterized in that: A variable diameter drum rotating shaft is arranged at the center of the variable diameter drum. The drum is connected to the variable diameter drum rotating shaft through a transverse connecting rod and is rotatably arranged on the frame through the variable diameter drum rotating shaft. The variable diameter drum component further includes an auxiliary gearbox arranged on the frame, an auxiliary gearbox power output shaft rotatably arranged on the frame through a bearing bracket, a variable diameter drum driving rubber wheel arranged on the auxiliary gearbox power output shaft, and a variable diameter drum outer drive ring arranged at the front end of the variable diameter drum and adapted to the variable diameter drum driving rubber wheel. The auxiliary gearbox is in transmission connection with the variable diameter drum through the variable diameter drum driving rubber wheel and the variable diameter drum outer drive ring.

5. The variable-diameter drum type Jerusalem artichoke harvester according to claim 4, wherein: A large-diameter end mounting bracket of the variable-diameter drum rotating shaft is arranged at the large end of the variable-diameter drum, and a small-diameter end mounting bracket of the variable-diameter drum rotating shaft is arranged at the small end of the variable-diameter drum. The variable-diameter drum is rotatably arranged on the frame through the large-diameter end mounting bracket of the variable-diameter drum rotating shaft and the small-diameter end mounting bracket of the variable-diameter drum rotating shaft.

6. The variable-diameter drum type Jerusalem artichoke harvester according to claim 4, characterized in that: A variable-diameter drum filter screen mounting bracket is arranged along the circumferential direction of the drum. A variable-diameter drum filter screen is arranged inside the variable-diameter drum filter screen mounting bracket, and a variable-diameter spiral ring is arranged on the inner circumference of the variable-diameter drum filter screen.

7. The variable-diameter drum type Jerusalem artichoke harvester according to claim 1, wherein: There are flanges parallel and intersecting with the rear vertical rods of the frame on both the left and right sides of the left half of the receiving groove; tires are arranged under the frame.

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