Four-wheel driving device of cyperus esculentus harvester roller

Abstract

When the four-wheel driving device of the cyperus esculentus harvester roller is used, power is distributed to the front side and the rear side through the middle gearbox to be output, the rear side is input to the rear gearbox through the rear transmission shaft, and the rear gearbox converts 90 degrees and then transmits the power to the rear left transmission shaft. The rear left transmission shaft transmits the power to a rear left driving wheel and a rear right driving wheel, the rear left driving wheel and the rear right driving wheel are connected through a rear right transmission shaft, and synchronous rotation of the two driving wheels on the rear side is achieved; the front side inputs power to the front gearbox through the front transmission shaft, the front gearbox converts 90 degrees and then transmits the power to the front left transmission shaft, the front left transmission shaft transmits the power to the front left driving wheel and the front right driving wheel, the front left driving wheel and the front right driving wheel are connected through the front right transmission shaft, and synchronous rotation of the two driving wheels on the front side is achieved. The cyperus esculentus screening device can drive the circular roller to rotate in the left-right direction to screen cyperus esculentus, and is stable in structure, low in failure rate and easy to replace.

Description

Technical Field

[0001] This utility model relates to the field of agricultural machinery technology, and particularly to the field of tiger nut harvester technology, specifically a four-wheel drive device for the roller of a tiger nut harvester. Background Technology

[0002] Agricultural machinery refers to all kinds of machinery used in crop cultivation and animal husbandry, as well as in the initial processing and handling of agricultural and livestock products. Agricultural machinery includes agricultural power machinery, farmland construction machinery, soil tillage machinery, planting and fertilization machinery, plant protection machinery, farmland irrigation and drainage machinery, crop harvesting machinery, agricultural product processing machinery, livestock machinery, and agricultural transportation machinery, etc.

[0003] Existing tiger nut harvesters typically separate tiger nuts from the sand during harvesting operations, as sand, tiger nuts, and weeds are mixed together. The tiger nuts are usually sieved through a circular drum (screen) with a diameter of 1.5 to 2 meters, positioned along the left and right sides. The sieve is driven by a small gear (sometimes with the same module as the large gear ring, sometimes a different shape, or a sprocket / chain) located below the left or right end of the drum, which meshes with a gear ring mounted on top of the drum with the same diameter. This meshing drives the drum to rotate left and right. During operation, the tractor's main power is transmitted to the small gear via the gearbox. The meshing of the small gear and the gear ring drives the large circular drum to rotate. Because the large gear ring has a large diameter (generally around 1.5-2 meters) and the small gear has a small diameter (generally around 200mm), with a significant difference in the number of teeth, the small gear experiences severe wear during operation. Simultaneously, due to undercutting of the large and small gears, the large gear ring is also prone to localized tooth damage, resulting in a very high machine failure rate and complicated replacements. Furthermore, when the machine is under heavy load, the force of the entire transmission is concentrated on a single tooth of the small gear, making the gear teeth particularly prone to breakage or severe wear. Additionally, when there is a large amount of material inside the circular drum or when it is overloaded, the large gear ring and the circular drum share only one point of force, which can cause the circular drum to twist, deform, or become damaged. Once the circular drum is damaged, it must be lifted down by a crane for repair, which is time-consuming and extremely complicated.

[0004] Therefore, it is desirable to provide a drive device for the drum of a tiger nut harvester, which can drive the circular drum to rotate in the left and right directions to screen tiger nuts, and has a stable structure, low failure rate, and simple replacement. Utility Model Content

[0005] In order to overcome the shortcomings of the prior art, one objective of this utility model is to provide a four-wheel drive device for the drum of a tiger nut harvester, which can drive the circular drum to rotate in the left and right direction to realize the screening of tiger nuts. It has a stable structure, low failure rate, simple replacement, and is suitable for large-scale promotion and application.

[0006] Another objective of this invention is to provide a four-wheel drive device for the roller of a tiger nut harvester, which is ingeniously designed, simple in structure, easy to manufacture, and has low manufacturing cost, making it suitable for large-scale promotion and application.

[0007] To achieve the above objectives, this utility model provides a four-wheel drive device for a tiger nut harvester drum, characterized by comprising a front gearbox, a rear gearbox, a middle gearbox, a front drive shaft, a rear drive shaft, a front left drive wheel, a front right drive wheel, a rear left drive wheel, a rear right drive wheel, a front left drive shaft, a front right drive shaft, a rear left drive shaft, and a rear right drive shaft, wherein:

[0008] The front gearbox and the rear gearbox are spaced apart from each other, and the intermediate gearbox is located between the front gearbox and the rear gearbox. The front drive shaft and the rear drive shaft are both arranged in the front-rear direction and spaced apart from each other. The front drive shaft is located between the front gearbox and the intermediate gearbox and connects the front gearbox and the intermediate gearbox respectively. The rear drive shaft is located between the intermediate gearbox and the rear gearbox and connects the intermediate gearbox and the rear gearbox respectively.

[0009] The front left drive wheel and the front right drive wheel are both vertically arranged and along the front-rear direction, and are spaced apart from each other on the left and right. The front left drive shaft and the front right drive shaft are both arranged along the left and right direction, and are spaced apart from each other on the left and right. The front left drive shaft is located between the front gearbox and the front left drive wheel and connects to the front gearbox and the front left drive wheel respectively. The front right drive shaft is located between the front left drive wheel and the front right drive wheel and connects to the front left drive wheel and the front right drive wheel respectively. The rear left drive wheel and the rear right drive wheel are both vertically arranged and along the front-rear direction, and are spaced apart from each other on the left and right. The rear left drive shaft and the rear right drive shaft are both arranged along the left and right direction, and are spaced apart from each other on the left and right. The rear left drive shaft is located between the rear gearbox and the rear left drive wheel and connects to the rear gearbox and the rear left drive wheel respectively. The rear right drive shaft is located between the rear left drive wheel and the rear right drive wheel and connects to the rear left drive wheel and the rear right drive wheel respectively.

[0010] The intermediate gearbox is used to drive the front left drive shaft and the rear left drive shaft to rotate synchronously around the left and right directions, respectively, through the front drive shaft and the front gearbox, as well as the rear drive shaft and the rear gearbox.

[0011] Preferably, the front gearbox, the rear gearbox, and the intermediate gearbox are all bevel gear right-angle gearboxes.

[0012] Preferably, the front left drive shaft, the front right drive shaft, the rear left drive shaft, and the rear right drive shaft are all universal joint drive shafts.

[0013] Preferably, the front left drive wheel and the rear left drive wheel are spaced apart from each other.

[0014] Preferably, the front right drive wheel and the rear right drive wheel are spaced apart from each other.

[0015] Preferably, the front left drive wheel, the front right drive wheel, the rear left drive wheel, and the rear right drive wheel are all rubber rollers. Each rubber roller includes a roller frame, an annular rubber outer layer, and a roller shaft. The roller frame is vertically arranged along the front-rear direction, and the roller shaft is arranged along the left-right direction. The middle portion of the roller shaft is inserted into the roller frame along the left-right direction. The annular rubber outer layer is vertically arranged along the front-rear direction and sleeved on the outer surface of the roller frame. The roller shaft of the front left drive wheel is located at the right end of the front left drive shaft and... The left end of the front right drive shaft is connected to the right end of the front left drive shaft and the left end of the front right drive shaft respectively. The roller shaft of the front right drive wheel is located to the right of the right end of the front right drive shaft and is connected to the right end of the front right drive shaft. The roller shaft of the rear left drive wheel is located between the right end of the rear left drive shaft and the left end of the rear right drive shaft and is connected to the right end of the rear right drive shaft respectively. The roller shaft of the rear right drive wheel is located to the right of the right end of the rear right drive shaft and is connected to the right end of the rear right drive shaft.

[0016] More preferably, the outer surface of the roller frame is provided with an annular groove, and the annular rubber outer layer is embedded in the annular groove.

[0017] More preferably, the roller frame is a cast steel frame.

[0018] More preferably, the annular rubber outer layer is an annular vulcanized rubber outer layer.

[0019] More preferably, the annular rubber outer layer is an annular polyurethane rubber outer layer.

[0020] The main beneficial effects of this utility model are as follows:

[0021] 1. When the four-wheel drive device of the tiger nut harvester drum of this utility model is in use, the power is distributed to the front and rear sides through the intermediate gearbox. The rear side inputs power to the rear gearbox through the rear drive shaft. After the rear gearbox rotates 90 degrees, it transmits power to the rear left drive shaft. The rear left drive shaft then transmits power to the rear left drive wheel and the rear right drive wheel. The rear left drive wheel and the rear right drive wheel are connected through the rear right drive shaft, realizing the synchronous rotation of the two rear drive wheels. The front side inputs power to the front gearbox through the front drive shaft. After the front gearbox rotates 90 degrees, it transmits power to the front left drive shaft. The front left drive shaft then transmits power to the front left drive wheel and the front right drive wheel. The front left drive wheel and the front right drive wheel are connected through the front right drive shaft, realizing the synchronous rotation of the two front drive wheels. Therefore, it can drive the circular drum to rotate in the left and right direction to screen tiger nuts. Moreover, the structure is stable, the failure rate is low, and the replacement is simple, making it suitable for large-scale promotion and application.

[0022] 2. When the four-wheel drive device of the tiger nut harvester drum of this utility model is in use, the power is distributed to the front and rear sides through the intermediate gearbox. The rear side is input to the rear gearbox through the rear drive shaft. After the rear gearbox rotates 90 degrees, it transmits the power to the rear left drive shaft. The rear left drive shaft then transmits the power to the rear left drive wheel and the rear right drive wheel. The rear left drive wheel and the rear right drive wheel are connected through the rear right drive shaft, so that the two rear drive wheels rotate synchronously. The front side is input to the front gearbox through the front drive shaft. After the front gearbox rotates 90 degrees, it transmits the power to the front left drive shaft. The front left drive shaft then transmits the power to the front left drive wheel and the front right drive wheel. The front left drive wheel and the front right drive wheel are connected through the front right drive shaft, so that the two front drive wheels rotate synchronously. Therefore, its design is ingenious, its structure is simple, its manufacturing is convenient, its manufacturing cost is low, and it is suitable for large-scale promotion and application.

[0023] These and other objects, features and advantages of this utility model will be fully apparent from the following detailed description and drawings, and can be achieved by the means, devices and combinations thereof specifically pointed out in the description of the utility model. Attached Figure Description

[0024] Figure 1 This is a three-dimensional partial schematic diagram of a specific embodiment of the four-wheel drive device of the tiger nut harvester roller of this utility model in use.

[0025] Figure 2 yes Figure 1 The diagram shown is a partial top-view perspective of the specific embodiment in use, in which the frame is removed and the arrows indicate the direction of rotation.

[0026] (Symbol Explanation)

[0027] 1. Front gearbox; 2. Rear gearbox; 3. Intermediate gearbox; 4. Front driveshaft; 5. Rear driveshaft; 6. Front left drive wheel; 7. Front right drive wheel; 8. Rear left drive wheel; 9. Rear right drive wheel; 10. Front left driveshaft; 11. Front right driveshaft; 12. Rear left driveshaft; 13. Rear right driveshaft; 14. Frame; 15. Circular drum. Detailed Implementation

[0028] In order to better understand the technical content of this utility model, the following embodiments are provided for detailed description.

[0029] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0030] Please see Figures 1-2 As shown, in a specific embodiment of this utility model, the four-wheel drive device of the tiger nut harvester drum of this utility model includes a front gearbox 1, a rear gearbox 2, a middle gearbox 3, a front drive shaft 4, a rear drive shaft 5, a front left drive wheel 6, a front right drive wheel 7, a rear left drive wheel 8, a rear right drive wheel 9, a front left drive shaft 10, a front right drive shaft 11, a rear left drive shaft 12, and a rear right drive shaft 13, wherein:

[0031] The front gearbox 1 and the rear gearbox 2 are spaced apart from each other, the intermediate gearbox 3 is located between the front gearbox 1 and the rear gearbox 2, the front drive shaft 4 and the rear drive shaft 5 are both arranged in the front-rear direction and spaced apart from each other, the front drive shaft 4 is located between the front gearbox 1 and the intermediate gearbox 3 and connects the front gearbox 1 and the intermediate gearbox 3 respectively, and the rear drive shaft 5 is located between the intermediate gearbox 3 and the rear gearbox 2 and connects the intermediate gearbox 3 and the rear gearbox 2 respectively;

[0032] The front left drive wheel 6 and the front right drive wheel 7 are both vertically arranged and along the front-rear direction, and are spaced apart from each other on the left and right. The front left drive shaft 10 and the front right drive shaft 11 are both arranged along the left and right direction, and are spaced apart from each other on the left and right. The front left drive shaft 10 is located between the front gearbox 1 and the front left drive wheel 6 and connects the front gearbox 1 and the front left drive wheel 6 respectively. The front right drive shaft 11 is located between the front left drive wheel 6 and the front right drive wheel 7 and connects the front left drive wheel 6 and the front right drive wheel 7 respectively. The rear left drive wheel 8 and the rear right drive wheel 9 are both vertically arranged and along the front-rear direction, and are spaced apart from each other on the left and right. The rear left drive shaft 12 and the rear right drive shaft 13 are both arranged along the left-right direction and are spaced apart from each other on the left and right. The rear left drive shaft 12 is located between the rear gearbox 2 and the rear left drive wheel 8 and connects the rear gearbox 2 and the rear left drive wheel 8 respectively. The rear right drive shaft 13 is located between the rear left drive wheel 8 and the rear right drive wheel 9 and connects the rear left drive wheel 8 and the rear right drive wheel 9 respectively.

[0033] The intermediate gearbox 3 drives the front left drive shaft 10 and the rear left drive shaft 12 to rotate synchronously around the left and right directions via the front drive shaft 4, the front gearbox 1, the rear drive shaft 5, and the rear gearbox 2, respectively.

[0034] The front gearbox 1, the rear gearbox 2, and the intermediate gearbox 3 can be any suitable gearbox. In a specific embodiment of this utility model, the front gearbox 1, the rear gearbox 2, and the intermediate gearbox 3 are all bevel gear right-angle gearboxes. For example, a bevel gear right-angle gearbox commonly used in agricultural machinery, with a housing made of ductile iron in an integrated shape, and input and output shafts that are standard external spline shafts that can be connected to the internal spline holes of a universal joint drive shaft.

[0035] The front left drive shaft 10, the front right drive shaft 11, the rear left drive shaft 12, and the rear right drive shaft 13 can be any suitable drive shaft. In a specific embodiment of this utility model, the front left drive shaft 10, the front right drive shaft 11, the rear left drive shaft 12, and the rear right drive shaft 13 are all universal joint drive shafts. For example, a universal joint drive shaft commonly used in agricultural machinery has standard internal spline holes at both ends, which can be connected to the external spline shafts of the gearbox input / output ends and the spline shafts of the drive wheels.

[0036] The front left drive wheel 6 and the rear left drive wheel 8 can be arranged alternately or not. For example, the rear left drive wheel 8 can be located to the left or right rear of the front left drive wheel 6. Please refer to [link to relevant documentation]. Figures 1-2As shown, in a specific embodiment of this utility model, the front left drive wheel 6 and the rear left drive wheel 8 are arranged at intervals between each other.

[0037] The front right drive wheel 7 and the rear right drive wheel 9 can be arranged alternately or not. For example, the rear right drive wheel 9 can be located to the left or right rear of the front right drive wheel 7. Please refer to [link / reference]. Figure 2 As shown, in a specific embodiment of this utility model, the front right drive wheel 7 and the rear right drive wheel 9 are arranged at intervals between each other.

[0038] The front left drive wheel 6, the front right drive wheel 7, the rear left drive wheel 8, and the rear right drive wheel 9 can have any suitable configuration. In a specific embodiment of this utility model, the front left drive wheel 6, the front right drive wheel 7, the rear left drive wheel 8, and the rear right drive wheel 9 are all rubber rollers. Each rubber roller includes a roller frame, an annular rubber outer layer, and a roller shaft. The roller frame is vertically arranged and positioned along the front-rear direction. The roller shaft is positioned along the left-right direction, and its middle portion is inserted into the roller frame along the left-right direction. The annular rubber outer layer is vertically arranged and positioned along the front-rear direction and is sleeved on the outer surface of the roller frame. The front left drive wheel 6... The roller shafts are located between the right end of the front left drive shaft 10 and the left end of the front right drive shaft 11, respectively connecting the right ends of the front left drive shaft 10 and the left ends of the front right drive shaft 11. The roller shaft of the front right drive wheel 7 is located to the right of the right end of the front right drive shaft 11 and is connected to the right end of the front right drive shaft 11. The roller shaft of the rear left drive wheel 8 is located between the right end of the rear left drive shaft 12 and the left end of the rear right drive shaft 13, respectively connecting the right ends of the rear left drive shaft 12 and the left ends of the rear right drive shaft 13. The roller shaft of the rear right drive wheel 9 is located to the right of the right end of the rear right drive shaft 13 and is connected to the right end of the rear right drive shaft 13. Specifically, the center part of the roller frame is machined in the left-right direction to form a hole corresponding to the roller shaft, facilitating the insertion of the roller shaft.

[0039] The annular rubber outer layer is fitted onto the outer surface of the roller frame and can adopt any suitable structure. In a specific embodiment of this utility model, the outer surface of the roller frame is provided with an annular groove, and the annular rubber outer layer is embedded in the annular groove. Specifically, the annular groove is machined into the outer surface of the roller frame to allow for hot-pressing and vulcanizing of rubber.

[0040] The roller frame can be made of any suitable material. In one specific embodiment of this utility model, the roller frame is a cast steel frame.

[0041] The annular rubber outer layer can be any suitable type of annular rubber outer layer. In a specific embodiment of this utility model, the annular rubber outer layer is an annular vulcanized rubber outer layer.

[0042] The annular rubber outer layer can be made of any suitable material. In one specific embodiment of this invention, the annular rubber outer layer is an annular polyurethane rubber outer layer. The annular polyurethane rubber outer layer has high strength and high wear resistance.

[0043] In use, the four-wheel drive device of the tiger nut harvester roller of this utility model is installed on the frame 14 of the tiger nut harvester. This mainly involves fixing the front gearbox 1, rear gearbox 2, and intermediate gearbox 3 to the frame 14. The front left drive wheel 6, front right drive wheel 7, rear left drive wheel 8, rear right drive wheel 9, front left drive shaft 10, front right drive shaft 11, rear left drive shaft 12, and rear right drive shaft 13 are all rotatably mounted on the frame 14 in the left-right direction (e.g., via bearing seats). The intermediate gearbox 3 of the four-wheel drive device of the tiger nut harvester roller of this utility model is connected to the drive unit of the tiger nut harvester, such as the power take-off shaft of a tractor. The circular roller 15 of the tiger nut harvester is supported on the front left drive wheel 6, front right drive wheel 7, rear left drive wheel 8, and rear right drive wheel 9 of the four-wheel drive device of the tiger nut harvester roller of this utility model. The front left drive wheel 6 and front right drive wheel 7 are respectively supported on… The lower front and lower rear parts of the left end of the circular roller 15 are supported by the left rear drive wheel 8 and the right rear drive wheel 9, respectively. In this way, the main power of the tractor is distributed to the front and rear sides through the intermediate gearbox 3. The rear side is input to the rear gearbox 2 through the rear drive shaft 5. After the rear gearbox 2 rotates 90 degrees, it transmits the power to the rear left drive shaft 12. The rear left drive shaft 12 then transmits the power to the rear left drive wheel 8 and the rear right drive wheel 9. The rear left drive wheel 8 and the rear right drive wheel 9 are connected through the rear right drive shaft 13, so that the two drive wheels on the rear side rotate synchronously. The front side is input to the front gearbox 1 through the front drive shaft 4. After the front gearbox 1 rotates 90 degrees, it transmits the power to the front left drive shaft 10. The front left drive shaft 10 then transmits the power to the front left drive wheel 6 and the front right drive wheel 7. The front left drive wheel 6 and the front right drive wheel 7 are connected through the front right drive shaft 11, so that the two drive wheels on the front side rotate synchronously.

[0044] Therefore, since the power is evenly distributed to the drive wheels on both the front and rear sides through the intermediate gearbox 3, the four drive wheels rotate at the same speed, and the circular drum 15 is driven by friction to rotate, thereby driving the screen cylinder and completing the screening operation.

[0045] Compared with the prior art, this utility model provides a four-wheel drive device for the drum of a tiger nut harvester, which has the following beneficial effects:

[0046] 1. The circular drum of the tiger nut harvester is supported by four drive wheels to rotate and perform screening operations. This utility model solves the technical problem that due to the large diameter of the large gear ring and the small diameter of the small gear, the difference in the number of teeth is huge, so the wear of the small gear and the large gear ring is very serious, the failure rate is very high, and the replacement is also very troublesome.

[0047] 2. This utility model solves the technical problem that when the machine is under heavy load or overloaded, the force of the entire transmission is concentrated on the force point of one tooth of the pinion, which makes the gear teeth particularly prone to breakage, wear, or causing the circular roller to twist, deform and be damaged. Once the circular roller is damaged, it must be lifted down by a crane for repair, which is time-consuming and very complicated.

[0048] In summary, the four-wheel drive device of the tiger nut harvester drum of this utility model can drive the circular drum to rotate in the left and right directions to realize the screening of tiger nuts. It has a stable structure, low failure rate, simple replacement, ingenious design, simple structure, easy manufacturing, and low manufacturing cost, making it suitable for large-scale promotion and application.

[0049] Therefore, it is evident that the objective of this utility model has been fully and effectively achieved. The function and structural principles of this utility model have been demonstrated and explained in the embodiments. Without departing from the stated principles, any modifications can be made to the implementation methods. Therefore, this utility model includes all modified embodiments based on the spirit and scope of the claims.

Claims

1. A four-wheel drive device for a tiger nut harvester drum, characterized in that, This includes a front gearbox, a rear gearbox, an intermediate gearbox, a front driveshaft, a rear driveshaft, a front left drive wheel, a front right drive wheel, a rear left drive wheel, a rear right drive wheel, a front left driveshaft, a front right driveshaft, a rear left driveshaft, and a rear right driveshaft, wherein: The front gearbox and the rear gearbox are spaced apart from each other, and the intermediate gearbox is located between the front gearbox and the rear gearbox. The front drive shaft and the rear drive shaft are both arranged in the front-rear direction and spaced apart from each other. The front drive shaft is located between the front gearbox and the intermediate gearbox and connects the front gearbox and the intermediate gearbox respectively. The rear drive shaft is located between the intermediate gearbox and the rear gearbox and connects the intermediate gearbox and the rear gearbox respectively. The front left drive wheel and the front right drive wheel are both vertically arranged and along the front-rear direction, and are spaced apart from each other on the left and right. The front left drive shaft and the front right drive shaft are both arranged along the left and right direction, and are spaced apart from each other on the left and right. The front left drive shaft is located between the front gearbox and the front left drive wheel and connects to the front gearbox and the front left drive wheel respectively. The front right drive shaft is located between the front left drive wheel and the front right drive wheel and connects to the front left drive wheel and the front right drive wheel respectively. The rear left drive wheel and the rear right drive wheel are both vertically arranged and along the front-rear direction, and are spaced apart from each other on the left and right. The rear left drive shaft and the rear right drive shaft are both arranged along the left and right direction, and are spaced apart from each other on the left and right. The rear left drive shaft is located between the rear gearbox and the rear left drive wheel and connects to the rear gearbox and the rear left drive wheel respectively. The rear right drive shaft is located between the rear left drive wheel and the rear right drive wheel and connects to the rear left drive wheel and the rear right drive wheel respectively. The intermediate gearbox is used to drive the front left drive shaft and the rear left drive shaft to rotate synchronously around the left and right directions, respectively, through the front drive shaft and the front gearbox, as well as the rear drive shaft and the rear gearbox.

2. The four-wheel drive device for the drum of the tiger nut harvester as described in claim 1, characterized in that, The front gearbox, the rear gearbox, and the intermediate gearbox are all bevel gear right-angle gearboxes.

3. The four-wheel drive device for the drum of the tiger nut harvester as described in claim 1, characterized in that, The front left drive shaft, the front right drive shaft, the rear left drive shaft, and the rear right drive shaft are all universal joint drive shafts.

4. The four-wheel drive device for the drum of the tiger nut harvester as described in claim 1, characterized in that, The front left drive wheel and the rear left drive wheel are spaced apart from each other.

5. The four-wheel drive device for the drum of the tiger nut harvester as described in claim 1, characterized in that, The front right drive wheel and the rear right drive wheel are spaced apart from each other.

6. The four-wheel drive device for the drum of the tiger nut harvester as described in claim 1, characterized in that, The front left drive wheel, the front right drive wheel, the rear left drive wheel, and the rear right drive wheel are all rubber rollers. Each rubber roller includes a roller frame, an annular rubber outer layer, and a roller shaft. The roller frame is vertically arranged along the front-rear direction, and the roller shaft is arranged along the left-right direction. The middle part of the roller shaft is inserted into the roller frame along the left-right direction. The annular rubber outer layer is vertically arranged along the front-rear direction and sleeved on the outer surface of the roller frame. The roller shaft of the front left drive wheel is located at the right end of the front left drive shaft and the... The left end of the front right drive shaft is connected to the right end of the front left drive shaft and the left end of the front right drive shaft respectively. The roller shaft of the front right drive wheel is located to the right of the right end of the front right drive shaft and is connected to the right end of the front right drive shaft. The roller shaft of the rear left drive wheel is located between the right end of the rear left drive shaft and the left end of the rear right drive shaft and is connected to the right end of the rear right drive shaft respectively. The roller shaft of the rear right drive wheel is located to the right of the right end of the rear right drive shaft and is connected to the right end of the rear right drive shaft.

7. The four-wheel drive device for the drum of the tiger nut harvester as described in claim 6, characterized in that, The outer side of the roller frame is provided with an annular groove, and the annular rubber outer layer is embedded in the annular groove.

8. The four-wheel drive device for the drum of the tiger nut harvester as described in claim 6, characterized in that, The roller frame is a cast steel frame.

9. The four-wheel drive device for the drum of the tiger nut harvester as described in claim 6, characterized in that, The annular rubber outer layer is an annular vulcanized rubber outer layer.

10. The four-wheel drive device for the drum of the tiger nut harvester as described in claim 6, characterized in that, The annular rubber outer layer is an annular polyurethane rubber outer layer.

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