Multi-stage vibration sweet potato digging and conveying device

Abstract

The invention provides a multi-stage vibration sweet potato digging and conveying device which comprises a machine frame and further comprises a walking mechanism, a driving system assembly, a conveying mechanism, a digging mechanism, a vibration mechanism and a depth limiting mechanism, the walking mechanism is arranged at the bottom end of the machine frame, and the driving system assembly is arranged at the upper end of the machine frame; the conveying mechanism is erected at the upper end of the rack and located above the driving system assembly, the excavating mechanism is arranged at the front end of the conveying mechanism, the depth limiting mechanism is arranged at the front end of the conveying mechanism and located above the excavating mechanism, and the vibrating mechanisms are arranged in the middle of the conveying mechanism. The problems that the amount of labor used for sweet potato harvesting is large and the labor intensity is high at present are solved, and meanwhile the problems that sweet potato and soil separation is not clear, efficiency is low, digging resistance is large, and harvesting loss is large existing in sweet potato mechanical harvesting at present are solved.

Description

Technical Field

[0001] The invention relates to the technical field of sweet potato harvesting equipment, and in particular to a multi-stage vibration sweet potato digging and conveying device. Background Art

[0002] In my country, sweet potatoes are widely planted and are an important cash crop and food crop. Sweet potato harvesting is a labor-intensive operation that requires multiple processes including vine handling, digging, potato-soil separation, picking, and centralized packing.

[0003] At present, manual harvesting and segmented harvesting are still the majority of sweet potato harvesting methods, which consume a lot of manpower and are very labor-intensive. A few self-propelled combine harvesters still have problems such as large harvesting losses, unclear potato-soil separation, and large digging resistance. Summary of the invention

[0004] The invention provides a multi-stage vibration sweet potato digging and conveying device, which solves the problems of large labor volume and high labor intensity in current sweet potato harvesting, and also solves the problems of unclear potato-soil separation, low efficiency, large digging resistance, large harvesting loss, etc. in current mechanized sweet potato harvesting.

[0005] To achieve the above object, the present invention adopts the following technical solution:

[0006] A multi-stage vibration sweet potato digging and conveying device comprises a frame, a traveling mechanism, a driving system assembly, a conveying mechanism, a digging mechanism, a vibrating mechanism and a depth limiting mechanism;

[0007] The walking mechanism is arranged at the bottom end of the frame, and is used to drive and control the movement and movement direction of the frame. The driving system assembly is arranged at the upper end of the frame, and is used to provide power to the walking mechanism, so that the walking mechanism can operate;

[0008] The conveying mechanism is mounted on the upper end of the frame and above the drive system assembly, and is used to convey the excavated sweet potatoes to a designated location. The excavating mechanism is arranged at the front end of the conveying mechanism, and is used to excavate and turn over the sweet potatoes in the soil ridges. The depth limiting mechanism is arranged at the front end of the conveying mechanism and above the excavating mechanism, and is used to control the excavation depth of the excavating mechanism during operation. There are at least two groups of vibration mechanisms, both of which are arranged in the middle of the conveying mechanism. The purpose of changing the amplitude is achieved by changing the phase angle of the two vibration mechanisms, so as to adapt to the working conditions of soils with different viscosities, remove the soil and ensure that the sweet potatoes are not damaged.

[0009] Preferably, the traveling mechanism comprises a chassis frame, a gearbox, a control console, active traveling wheels, driven traveling wheels and tracks; the chassis frame is arranged at the lower end of the frame; the gearbox and the control console are both arranged on the frame; the control console can control the operation of the gearbox and the drive system assembly; the active traveling wheels are arranged at the front end of the chassis frame and connected to the output end of the gearbox; the driven traveling wheels are distributed at the rear end and the middle part of the chassis frame; the tracks are arranged on the active traveling wheels and the driven traveling wheels, and rotate with the rotation of the active traveling wheels.

[0010] Preferably, the conveying mechanism includes a conveying frame, a driving motor, an active driving wheel assembly, a driven driving wheel assembly, a bar conveyor belt and a transmission shaft. The conveying frame is arranged on a frame, and the conveying frame has a horizontal end and an inclined end. The active driving wheel assembly is arranged at the tail of the horizontal end of the conveying frame. The driving motor is arranged on the horizontal end of the conveying frame and is connected to the active driving wheel assembly through a belt or a chain. The driven driving wheel assembly is distributed on the inclined end of the conveying frame and is connected to the active driving wheel assembly through a belt or a chain. The bar conveyor belt is arranged on the active driving wheel assembly and the driven driving wheel assembly, and rotates with the rotation of the active driving wheel assembly. The transmission shaft is arranged in the middle of the conveying frame and is connected to the vibration mechanism through a belt or a chain.

[0011] Preferably, the active driving wheel assembly includes a driving shaft, a driving wheel and a driving pulley, the driving shaft is arranged on the horizontal end tail of the conveying frame, the driving wheel is symmetrically arranged on the driving shaft and is located on the inner side of the conveying frame, the driving pulley is arranged at one end of the driving shaft and is connected to the driving motor through a belt or a chain, and the driven driving wheel assembly includes a driven shaft, a driven wheel and a driven pulley, the driven shaft is arranged on the inclined end of the conveying frame, the driven wheel is arranged on the driven shaft and is located on the inner side of the conveying frame, the driven pulley is arranged on the driven shaft located on the outer side of the conveying frame and is connected to the driving pulley through a belt or a chain, and rotates with the rotation of the driving pulley.

[0012] Preferably, the vibration mechanism includes a vibration connecting plate, a vibration shaft, a vibration wheel and a vibration pulley, the vibration connecting plate is arranged on the inclined end side of the conveyor frame, one end of the vibration shaft is arranged on the vibration connecting plate, and the other end is rotatably connected to the inclined end side of the conveyor frame, the vibration wheel is in a herringbone shape, and is arranged at both ends of the vibration shaft, the vibration pulley is arranged on the vibration shaft outside the inclined end of the conveyor frame, and is connected to the driven pulley and the transmission shaft through a belt or chain, and as the driven pulley rotates, the vibration wheel is driven to cause the bar conveyor belt to vibrate.

[0013] Preferably, the excavation mechanism includes a V-shaped front shovel, an excavation connecting piece and a soil combing bar. The excavation connecting piece is arranged at both ends of the front shovel and is connected to the conveying frame. The two sides of the front shovel are inclined inward so that the excavated sweet potatoes can be moved together and conveyed to the middle. The soil combing bar is arranged at the rear end of the front shovel to separate the sweet potatoes from large pieces of soil.

[0014] Preferably, the depth limiting mechanism includes a depth limiting connecting frame, a depth limiting adjustment component, a depth limiting adjustment frame and a depth limiting wheel, the depth limiting connecting frame is connected to the conveying frame, the depth limiting adjustment frame is arranged on the depth limiting connecting frame and one end is foldable and connected to the conveying frame, the depth limiting wheel is inclined inwardly and symmetrically arranged on one end of the depth limiting connecting frame, the depth limiting adjustment component is arranged on the depth limiting connecting frame and connected to the depth limiting adjustment frame, and is used to adjust the height of the depth limiting wheel, and control the excavation depth of the excavation mechanism by controlling the height of the depth limiting wheel.

[0015] Preferably, the depth limit adjustment assembly includes an adjustment seat, an adjustment cylinder, an adjustment screw and an adjustment handle, the adjustment seat is arranged on a depth limit connecting frame, the adjustment cylinder is arranged on a depth limit adjustment frame, the adjustment screw is arranged on the adjustment seat and is threadedly connected to the adjustment cylinder, and the adjustment handle is arranged on the adjustment screw, and the height of the depth limit wheel is controlled by controlling the threading depth of the adjustment screw and the adjustment cylinder.

[0016] Preferably, a foldable rear platform is provided on the rear end of the frame for facilitating the collection of sweet potatoes on the conveying mechanism, and a side platform is provided on the side of the frame for workers to stand and control the movement of the walking mechanism, and a stool is provided on the side platform.

[0017] Preferably, a handle light assembly that can be used for lighting is provided on the horizontal end of the conveying frame.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] (1) The digging mechanism and the depth limiting mechanism cooperate with each other to improve the sweet potato digging efficiency. The front digging shovel is V-shaped and its two sides are inclined toward the middle. When digging, the digging resistance can be minimized. The depth limiting wheel is adjustable to control the digging depth of the front digging shovel to avoid excessive digging and large digging resistance.

[0020] (2) The conveying mechanism and the vibrating mechanism cooperate to realize the efficient separation of the sweet potatoes and the soil blocks. The active driving wheel assembly and the driven driving wheel assembly of the conveying mechanism can stably drive the bar conveyor belt to rotate, and the excavated sweet potatoes are transported and processed. During the transportation process, the inner side of the conveying frame can scrape the soil, and cooperate with the multiple vibrating wheels distributed in a triangular shape to vibrate at the same frequency to vibrate off the soil blocks on the sweet potatoes to avoid unclear separation of the sweet potatoes and soil, and the loss caused by throwing away the sweet potatoes as soil blocks. In addition, the purpose of changing the amplitude is achieved by changing the phase angle of the two vibrating mechanisms, so as to remove the soil and ensure that the sweet potatoes are not damaged under the working conditions of different viscosity soils. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0022] Figure 2 It is a schematic diagram of the walking mechanism of the present invention;

[0023] Figure 3 It is a schematic diagram of the conveying mechanism of the present invention;

[0024] Figure 4 It is a schematic diagram of the active drive wheel assembly of the present invention;

[0025] Figure 5 It is a schematic diagram of a driven driving wheel assembly of the present invention;

[0026] Figure 6 It is a schematic diagram of the vibration mechanism of the present invention;

[0027] Figure 7 It is a schematic diagram of the excavation mechanism of the present invention;

[0028] Figure 8 It is a schematic diagram of the depth limiting mechanism of the present invention;

[0029] Fig. 9 It is a schematic diagram of the bar conveyor belt of the present invention;

[0030] Fig.10 It is a schematic diagram of a conveying frame of the present invention. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0032] It should be noted that when a component / part is referred to as being "set on" another component / part, it may be directly set on the other component / part or there may also be an intermediate component / part. When a component / part is referred to as being "connected / coupled" to another component / part, it may be directly connected / coupled to the other component / part or there may be an intermediate component / part at the same time. The term "connection / coupling" as used herein may include electrical and / or mechanical physical connections / couplings. The term "includes / comprising" as used herein refers to the presence of a feature, step or component / part, but does not exclude the presence or addition of one or more other features, steps or components / parts. The term "and / or" as used herein includes any and all combinations of one or more relevant listed items.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0034] See also Figure 1 As shown, a multi-stage vibration sweet potato excavation and conveying device includes a frame 1, a walking mechanism 2, a drive system assembly 3, a conveying mechanism 4, an excavation mechanism 5, a vibrating mechanism 6 and a depth limiting mechanism 7; the walking mechanism 2 is arranged at the bottom end of the frame 1, and is used to drive and control the movement and movement direction of the frame 1; the drive system assembly 3 is arranged at the upper end of the frame 1, and is used to provide power to the walking mechanism 2 so that the walking mechanism 2 can operate; the conveying mechanism frame 4 is arranged at the upper end of the frame 1 and is above the drive system assembly 3, and is used to convey the excavated sweet potatoes to a specified position; the excavation mechanism 5 is arranged at the front end of the conveying mechanism 4, and is used to excavate and turn out the sweet potatoes in the soil ridge; the depth limiting mechanism 7 is arranged at the front end of the conveying mechanism 4 and is above the excavation mechanism 5, and is used to control the excavation depth of the excavation mechanism 5 during operation; at least two groups of vibrating mechanisms 6 are arranged in the middle of the conveying mechanism 4, and the purpose of changing the amplitude is achieved by changing the phase angle of the two vibrating mechanisms 6, so as to adapt to the working conditions of soils with different viscosities, and can both remove soil and ensure that the sweet potatoes are not damaged.

[0035] To change the phase angle of the two vibration mechanisms 6, it is only necessary to change the degree of symmetry between the two vibration mechanisms 6. If the two vibration mechanisms 6 are symmetrical to each other, they will vibrate at the same frequency. If the symmetry of the vibration mechanisms 6 is adjusted to make them asymmetrical, they will not vibrate at the same frequency. The vibration amplitude of each vibration mechanism 6 is different when it vibrates alone or at the same time, so as to achieve the purpose of changing the vibration amplitude. In practice, the amplitude can be adjusted according to the actual situation of the soil, and the soil blocks can be removed without damaging the sweet potatoes. The specific adjustment can be completed by loosening the belt or chain on one of the vibration mechanisms 6 and rotating it by an angle to make the two vibration mechanisms 6 asymmetrical.

[0036] The drive system assembly 3 is a common existing technology, which includes conventional drive devices or components such as an engine, a fuel tank and a hydraulic system. The present invention generally refers to it as a drive system assembly, and its main function is to provide power.

[0037] See also Figure 2 As shown, the walking mechanism 2 includes a chassis frame 21, a gearbox 22, a control console 23, an active walking wheel 24, a driven walking wheel 25 and a crawler 26. The chassis frame 21 is arranged at the lower end of the frame 1, and the gearbox 22 and the control console 23 are both arranged on the frame 1. The gearbox 22 is connected to the drive system assembly 3 by transmission. The control console 23 can control the operation of the gearbox 22 and the drive system assembly 3. The active walking wheel 24 is arranged at the front end of the chassis frame 21 and connected to the output end of the gearbox 22. The driven walking wheel 25 is distributed at the rear end and the middle part of the chassis frame 21. Some of the driven walking wheels 25 have the function of tensioning wheels. The crawler 26 is arranged on the active walking wheel 24 and the driven walking wheel 25, and rotates with the rotation of the active walking wheel 24. When in action, the drive system assembly 3 provides power to the gearbox 22, and the gearbox 22 drives the active walking wheel 24. Then the control console 23 controls the gearbox 22 to control the rotation of the crawler 26, thereby controlling the overall movement direction.

[0038] See also Figure 3 and Fig.10 As shown, the conveying mechanism 4 includes a conveying frame 41, a driving motor 42, an active driving wheel assembly 43, a driven driving wheel assembly 44, a bar conveyor belt 45 and a transmission shaft 46. The conveying frame 41 is arranged on the frame 1, and the conveying frame 41 has a horizontal end and an inclined end. The active driving wheel assembly 43 is arranged at the tail of the horizontal end of the conveying frame 41. The driving motor 42 is arranged on the horizontal end of the conveying frame 41 and is connected to the active driving wheel assembly 43 through a belt or a chain. The driven driving wheel assembly 44 is distributed on the inclined end of the conveying frame 41 and is connected to the active driving wheel assembly 43 through a belt or a chain. The bar conveyor belt 45 is arranged on the active driving wheel assembly 43 and the driven driving wheel assembly 44, and rotates with the rotation of the active driving wheel assembly 43. The transmission shaft 46 is arranged in the middle of the conveying frame 41 and is connected to the vibration mechanism 6 through a belt or a chain. During operation, the driving system assembly 3 provides power to the driving motor 42, which then drives the active driving wheel assembly 43 and the driven driving wheel assembly 44, and finally drives the bar conveyor belt 45 to transport the sweet potatoes.

[0039] See also Figure 4 and Figure 5As shown, the active driving wheel assembly 43 includes a driving shaft 431, a driving wheel 432 and a driving pulley 433. The driving shaft 431 is arranged on the horizontal end tail of the conveying frame 41, the driving wheel 432 is symmetrically arranged on the driving shaft 431 and is located on the inner side of the conveying frame 41, the driving pulley 433 is arranged at one end of the driving shaft 431 and is connected to the driving motor 42 through a belt or a chain, and the driven driving wheel assembly 44 includes a driven shaft 441, a driven wheel 442 and a driven pulley 443. The driven shaft 441 is arranged on the inclined end of the conveying frame 41, the driven wheel 442 is arranged on the driven shaft 441 and is located on the inner side of the conveying frame 41, and the driven pulley 443 is arranged on the driven shaft 441 located on the outer side of the conveying frame 41 and is connected to the driving pulley 433 through a belt or a chain, and rotates with the rotation of the driving pulley 433.

[0040] See also Fig. 9 As shown, the bar conveyor belt 45 is a structure with convex sides and a concave middle part, and the driving wheel 432 is provided with a slot that can match the bar, just like a gear and a chain, the driving wheel 432 can continuously pull the bar conveyor belt 45 to operate; the driven wheel 442 is conical, so that the bar conveyor belt 45 will not deviate to the left and right directions, ensuring the stable operation of the bar conveyor belt 45; the driven wheel 442 at the front end of the conveyor frame 41 is not driven by a belt or chain, and it can rotate with the operation of the bar conveyor belt 45; some tensioning gears are set in the middle of the inclined end of the conveyor frame 41 for better transmission.

[0041] See also Figure 6 As shown, the vibration mechanism 6 includes a vibration connecting plate 61, a vibration shaft 62, a vibration wheel 63 and a vibration pulley 64. The vibration connecting plate 61 is arranged on the side of the inclined end of the conveying frame 41. One end of the vibration shaft 62 is arranged on the vibration connecting plate 61, and the other end is rotatably connected to the side of the inclined end of the conveying frame 41. The vibration wheel 63 is in a shape of a triangle and is arranged at both ends of the vibration shaft 62. The vibration pulley 64 is arranged on the vibration shaft 62 outside the inclined end of the conveying frame 41, and is connected to the driven pulley 443 and the transmission shaft 46 through a belt or chain. With the rotation of the driven pulley 443, the vibration wheel 63 is driven to make the bar conveyor belt 45 vibrate. During operation, the vibration wheel 63 distributed in a triangle shape during the rotation process will lift up the bar conveyor belt 45 each time it contacts the bar conveyor belt 45, and then put it down, so that the bar conveyor belt 45 will continuously vibrate to achieve the effect of vibrating and removing soil.

[0042] See also Figure 7As shown, the excavation mechanism 5 includes a V-shaped front shovel 51, an excavation connecting piece 52 and a soil combing bar 53. The excavation connecting piece 52 is arranged at both ends of the front shovel 51 and is connected to the conveying frame 41. The two sides of the front shovel 51 are inclined inward so that the excavated sweet potatoes can be moved toward the middle and conveyed. The soil combing bar 53 is arranged at the rear end of the front shovel 51 to separate the sweet potatoes from large pieces of soil.

[0043] See also Figure 8 As shown, the depth limiting mechanism 7 includes a depth limiting connecting frame 71, a depth limiting adjustment component 72, a depth limiting adjustment frame 73 and a depth limiting wheel 74. The depth limiting connecting frame 71 is connected to the conveying frame 41. The depth limiting adjustment frame 73 is arranged on the depth limiting connecting frame 71 and one end of the depth limiting adjustment frame is foldable and connected to the conveying frame 41. The depth limiting wheel 74 is symmetrically arranged on one end of the depth limiting connecting frame 71 and is inclined inwardly. The depth limiting adjustment component 72 is arranged on the depth limiting connecting frame 71 and connected to the depth limiting adjustment frame 73, and is used to adjust the height of the depth limiting wheel 74, and the excavation depth of the excavation mechanism 5 is controlled by controlling the height of the depth limiting wheel 74.

[0044] The depth limit adjustment assembly 72 includes an adjustment seat 721, an adjustment cylinder 722, an adjustment screw 723 and an adjustment handle 724. The adjustment seat 721 is arranged on the depth limit connection frame 71, the adjustment cylinder 722 is arranged on the depth limit adjustment frame 73, the adjustment screw 723 is arranged on the adjustment seat 721 and is screwed with the adjustment cylinder 722, and the adjustment handle 724 is arranged on the adjustment screw 723. The depth limit connection frame 71 is pulled by controlling the screwing depth of the adjustment screw 723 and the adjustment cylinder 722, thereby controlling the height position of the depth limit wheel 74. When rotating and adjusting, the position of the adjustment screw 723 on the adjustment seat 721 is unchanged, and the position of the adjustment cylinder 722 on the depth limit adjustment frame 73 is also unchanged. Therefore, when the adjustment screw 723 and the adjustment cylinder 722 are gradually screwed, the angle between the depth limit connection frame 71 and the depth limit adjustment frame 73 will change, thereby adjusting the height position relationship of the depth limit wheel 74.

[0045] See also Figure 1 As shown, a foldable rear platform 8 is provided on the rear end of the frame 1 for facilitating the collection, bagging or boxing of the sweet potatoes on the conveying mechanism 4. A side platform 9 is provided on the side of the frame 1 for workers to stand and control the movement of the walking mechanism 2. A stool 10 is provided on the side platform 9. A handle light assembly 11 for lighting is provided on the horizontal end of the conveying frame 41.

[0046] The excavation mechanism 5 and the depth limiting mechanism 7 of the present invention cooperate with each other to improve the sweet potato excavation efficiency. The front excavation shovel 51 is V-shaped and its two sides are inclined toward the middle. When excavating, the excavation resistance can be minimized, and the depth limiting wheel 74 is adjustable to control the excavation depth of the front shovel 51 to avoid excessive excavation causing large excavation resistance; the conveying mechanism 4 and the vibration mechanism 6 cooperate to achieve efficient separation of the sweet potato and the soil blocks. The active driving wheel assembly 43 and the driven driving wheel assembly 44 of the conveying mechanism 4 can stably drive the grid conveyor belt 45 to rotate, and the excavated sweet potatoes are transported and processed. During the transportation process, the inner side of the conveying frame 41 can scrape the soil, and cooperate with the multiple vibration wheels 63 distributed in a triangular shape to vibrate at the same frequency to vibrate the soil blocks on the sweet potatoes and separate them, so as to avoid unclear separation of the potato and soil, and the loss caused by treating the sweet potatoes as soil blocks and throwing them away.

[0047] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A multi-stage vibrating sweet potato digging and conveying device, comprising a frame, characterized in that: It also includes a walking mechanism, a driving system assembly, a conveying mechanism, an excavating mechanism, a vibrating mechanism and a depth limiting mechanism; The walking mechanism is arranged at the bottom end of the frame, and is used to drive and control the movement and movement direction of the frame. The driving system assembly is arranged at the upper end of the frame, and is used to provide power to the walking mechanism, so that the walking mechanism can operate; The conveying mechanism is mounted on the upper end of the frame and above the drive system assembly, and is used to convey the excavated sweet potatoes to a designated location. The excavating mechanism is arranged at the front end of the conveying mechanism, and is used to excavate and turn over the sweet potatoes in the soil ridges. The depth limiting mechanism is arranged at the front end of the conveying mechanism and above the excavating mechanism, and is used to control the excavation depth of the excavating mechanism during operation. There are at least two groups of vibration mechanisms, both of which are arranged in the middle of the conveying mechanism. The purpose of changing the amplitude is achieved by changing the phase angle of the two vibration mechanisms, so as to adapt to the working conditions of soils with different viscosities, remove the soil and ensure that the sweet potatoes are not damaged.

2. The multi-stage vibration sweet potato digging and conveying device according to claim 1 is characterized in that: The traveling mechanism comprises a chassis frame, a gearbox, a control console, active traveling wheels, driven traveling wheels and tracks; the chassis frame is arranged at the lower end of the frame; the gearbox and the control console are both arranged on the frame; the control console can control the operation of the gearbox and the drive system assembly; the active traveling wheels are arranged at the front end of the chassis frame and connected to the output end of the gearbox; the driven traveling wheels are distributed at the rear end and the middle part of the chassis frame; the tracks are arranged on the active traveling wheels and the driven traveling wheels, and rotate with the rotation of the active traveling wheels.

3. The multi-stage vibration sweet potato digging and conveying device according to claim 1 is characterized in that: The conveying mechanism includes a conveying frame, a driving motor, an active driving wheel assembly, a driven driving wheel assembly, a bar conveyor belt and a transmission shaft. The conveying frame is arranged on a frame, and the conveying frame has a horizontal end and an inclined end. The active driving wheel assembly is arranged at the tail of the horizontal end of the conveying frame. The driving motor is arranged on the horizontal end of the conveying frame and is connected to the active driving wheel assembly through a belt or a chain. The driven driving wheel assembly is distributed on the inclined end of the conveying frame and is connected to the active driving wheel assembly through a belt or a chain. The bar conveyor belt is arranged on the active driving wheel assembly and the driven driving wheel assembly, and rotates with the rotation of the active driving wheel assembly. The transmission shaft is arranged in the middle of the conveying frame and is connected to the vibration mechanism through a belt or a chain.

4. The multi-stage vibration sweet potato digging and conveying device according to claim 3 is characterized in that: The active driving wheel assembly includes a driving shaft, a driving wheel and a driving pulley, the driving shaft is arranged on the horizontal end tail of the conveying frame, the driving wheel is symmetrically arranged on the driving shaft and is located on the inner side of the conveying frame, the driving pulley is arranged at one end of the driving shaft and is connected to the driving motor through a belt or a chain, the driven driving wheel assembly includes a driven shaft, a driven wheel and a driven pulley, the driven shaft is arranged on the inclined end of the conveying frame, the driven wheel is arranged on the driven shaft and is located on the inner side of the conveying frame, the driven pulley is arranged on the driven shaft located on the outer side of the conveying frame and is connected to the driving pulley through a belt or a chain, and rotates with the rotation of the driving pulley.

5. The multi-stage vibration sweet potato digging and conveying device according to claim 4 is characterized in that: The vibration mechanism includes a vibration connecting plate, a vibration shaft, a vibration wheel and a vibration pulley. The vibration connecting plate is arranged on the inclined end side of the conveying frame. One end of the vibration shaft is arranged on the vibration connecting plate, and the other end is rotatably connected to the inclined end side of the conveying frame. The vibration wheel is in a herringbone shape and is arranged at both ends of the vibration shaft. The vibration pulley is arranged on the vibration shaft outside the inclined end of the conveying frame, and is connected to the driven pulley and the transmission shaft through a belt or chain. As the driven pulley rotates, the vibration wheel is driven to make the bar conveyor belt vibrate.

6. The multi-stage vibration sweet potato digging and conveying device according to claim 1 is characterized in that: The excavation mechanism includes a V-shaped front shovel, an excavation connecting piece and a soil combing bar. The excavation connecting piece is arranged at both ends of the front shovel and is connected to the conveying frame. The two sides of the front shovel are inclined inward so that the excavated sweet potatoes can be moved toward the middle and conveyed. The soil combing bar is arranged at the rear end of the front shovel to separate the sweet potatoes from large pieces of soil.

7. The multi-stage vibration sweet potato digging and conveying device according to claim 1 or 6, characterized in that: The depth limiting mechanism includes a depth limiting connecting frame, a depth limiting adjustment component, a depth limiting adjustment frame and a depth limiting wheel. The depth limiting connecting frame is connected to the conveying frame. The depth limiting adjustment frame is arranged on the depth limiting connecting frame and one end is foldable and connected to the conveying frame. The depth limiting wheel is symmetrically arranged inwardly on one end of the depth limiting connecting frame. The depth limiting adjustment component is arranged on the depth limiting connecting frame and connected to the depth limiting adjustment frame, and is used to adjust the height of the depth limiting wheel, and control the excavation depth of the excavation mechanism by controlling the height of the depth limiting wheel.

8. The multi-stage vibration sweet potato digging and conveying device according to claim 7 is characterized in that: The depth limit adjustment assembly includes an adjustment seat, an adjustment cylinder, an adjustment screw and an adjustment handle. The adjustment seat is arranged on a depth limit connecting frame, the adjustment cylinder is arranged on a depth limit adjustment frame, the adjustment screw is arranged on the adjustment seat and is threadedly connected to the adjustment cylinder, and the adjustment handle is arranged on the adjustment screw. The height of the depth limit wheel is controlled by controlling the threading depth of the adjustment screw and the adjustment cylinder.

9. The multi-stage vibration sweet potato digging and conveying device according to claim 1, characterized in that: A foldable rear platform is arranged on the rear end of the frame for facilitating the collection of sweet potatoes on the conveying mechanism; a side platform is arranged on the side of the frame for workers to stand and control the movement of the walking mechanism, and a stool is arranged on the side platform.

10. The multi-stage vibration sweet potato digging and conveying device according to claim 3, characterized in that: A handle light assembly which can be used for lighting is arranged on the horizontal end of the conveying frame.

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