Small flexible clamping soybean harvesting device for hilly areas

Abstract

The invention provides a small flexible clamping soybean harvesting device for hilly areas, and relates to the technical field of soybean harvesting. The small flexible clamping soybean harvesting device in the hilly area comprises a machine frame, a transmission assembly, a bottom layer belt assembly, a cutter and a top layer belt assembly are erected on the machine frame, soybean stalks are clamped in a double-clamping mode through the bottom layer belt assembly and the top layer belt assembly, the soybean stalks are kept stable, and therefore the soybean stalks can be harvested flexibly. The bottom of the soybean stalk is cut off through the cutter, so that the soybean harvesting action is achieved, the cut-off soybean stalk is conveyed to the rear portion through the bottom layer belt assembly and the top layer belt assembly, through the design, automatic soybean receiving can be achieved, the labor cost is reduced, meanwhile, the soybean stalk is fixed in a double-clamping mode, and the soybean stalk can be conveniently and rapidly harvested. And the phenomenon that soybean stalks are unstable due to inclination and tilting of the soybean stalks in the harvesting process and pods on the soybean stalks are exploded can be reduced.

Description

Technical Field

[0001] The present application relates to the technical field of soybean harvesting, and in particular to a small flexible soybean clamping harvesting device for hilly areas. Background Art

[0002] With the large-scale intercropping of corn and soybeans in hilly areas, soybean planting in hilly areas has been widely promoted. However, at present, harvesting in hilly areas mainly relies on manual labor, and large-scale mechanized harvesting equipment cannot be used. Manual harvesting is labor-intensive and costly, and the pods are easily exploded during the harvesting process, causing the beans inside to fall, affecting the efficiency of soybean harvesting. Summary of the invention

[0003] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a small-sized flexible soybean clamping harvesting device for hilly areas, comprising a frame, wherein a transmission assembly, a bottom belt assembly, a cutter and a top belt assembly are mounted on the frame, the transmission assembly is used to drive the bottom belt assembly, the cutter and the top belt assembly, the bottom belt assembly and the top belt assembly respectively include two groups of corresponding belt units, the top belt assembly is stacked on the top side of the bottom belt assembly, and the top belt assembly can be raised and lowered on the frame; the cutter is arranged between the corresponding belt units in the bottom belt assembly and is located on the bottom side of the bottom belt assembly.

[0004] Preferably, the frame comprises a belt frame for carrying the bottom belt assembly and a U-shaped frame for carrying the cutter.

[0005] Preferably, the transmission assembly includes an active transmission shaft rotatably arranged on the belt frame, a plurality of first bevel gear sets and a worm gear set are key-connected on the active transmission shaft, the other end of the first bevel gear set is key-connected to the bottom belt assembly through a first passive transmission shaft, the other end of the worm gear assembly is key-connected to a second passive transmission shaft, the second passive transmission shaft is rotatably connected to the U-shaped frame, and the other end of the second passive transmission shaft is key-connected to a second bevel gear set.

[0006] Preferably, the belt unit of the bottom belt assembly includes two groups of symmetrically arranged bottom pulley groups, a bottom belt, multiple tensioning assemblies and pre-tensioning assemblies, one end of the bottom pulley group is keyed to the first passive transmission shaft, the other end of the bottom pulley group is rotatably connected to the pre-tensioning assembly, the bottom belt is sleeved on the bottom pulley group and cooperates with the bottom pulley group in transmission, one end of multiple tensioning assemblies is elastically rotatably connected to the belt frame, the other end of multiple tensioning assemblies is rotatably abutted against the inner side of the bottom belt, one end of the pre-tensioning assembly connected to the bottom pulley group is slidably connected to the belt frame, and the other end of the pre-tensioning assembly is rotatably connected to the belt frame.

[0007] Preferably, the bottom pulley group includes a bottom driving pulley and a bottom driven pulley, the bottom driving pulley is keyed to the first passive transmission shaft, the bottom driven pulley is rotatably connected to the pretensioning assembly, and the bottom belt is sleeved on the bottom driving pulley and the bottom driven pulley.

[0008] Preferably, the tensioning assembly includes an L-shaped rotating rod, the corner of the L-shaped rotating rod is rotatably connected to the belt rack, one end of the L-shaped rotating rod is rotatably connected to a bottom tensioning wheel, the bottom tensioning wheel abuts against the bottom belt, the other end of the L-shaped rotating rod is hung with a tension spring, the other end of the tension spring is hung on a fixed rod, a plurality of the fixed rods are arranged as a group, each group of the fixed rods corresponds to the same tension spring, and the fixed rod is fixedly connected to the belt rack.

[0009] Preferably, the pre-tightening assembly includes a pre-tightening fork rod and a pre-tightening bolt, one end of the pre-tightening fork rod is rotatably connected to the bottom driven pulley, and the pre-tightening fork rod is slidably connected to the belt frame; the pre-tightening bolt is rotatably connected to the belt frame, and the pre-tightening bolt and one end of the pre-tightening fork rod away from the bottom driven pulley are threadedly matched.

[0010] Preferably, a cutter shaft is coaxially keyed on the cutter, and the cutter shaft key is connected to the other end of the second bevel gear set.

[0011] Preferably, the belt unit of the top belt assembly includes two symmetrically arranged groups of top belt pulleys, a top belt, a support frame and a plurality of top tensioning assemblies; the top belt pulley group includes a top driving pulley and a top driven pulley, the top driving pulley is coaxially keyed to the first passive transmission shaft, and the top driven pulley is coaxially keyed to the bottom driven pulley; the top belt is sleeved on the top driving pulley and the top driven pulley; the support frame includes a connecting rod and a plurality of rotating support rods, and the connecting rod lifting frame is mounted on the belt The belt rack, one end of the connecting rod is slidably mounted on the shaft between the bottom driving pulley and the top driving pulley, the other end of the connecting rod is coupled to the shaft between the bottom driven pulley and the top driven pulley, and a plurality of rotating member support rods are evenly fixed to the connecting rod; the top tensioning assembly includes a top tensioning wheel and a rotating connecting rod, the top tensioning wheel is rotatably connected to one end of the rotating connecting rod, the rotating connecting rod is rotatably connected to the rotating member support rod, and the other end of the rotating connecting rod is telescopically fixed to the L-shaped rotating rod.

[0012] Preferably, a lifting member is connected between the connecting rod and the belt frame.

[0013] The beneficial effects of the present invention are:

[0014] 1. The soybean stalks are clamped by the bottom belt assembly and the top belt assembly in a double clamping manner to keep the soybean stalks stable, and the bottom of the soybean stalks are cut off by the cutter, so as to realize the soybean harvesting action. The cut soybean stalks are transported to the rear by the bottom belt assembly and the top belt assembly. This design of the present invention can realize automatic soybean harvesting and reduce labor costs. At the same time, the soybean stalks are fixed in a double clamping manner, which can reduce the soybean stalks from tilting or falling during the harvesting process, resulting in instability of the soybean stalks and bursting of the bean pods thereon;

[0015] 2. By adjusting the tensioning assembly on the bottom belt assembly, the bottom belt and the top belt can simultaneously increase the strength of the straw and be suitable for straws of different thicknesses, thereby increasing the scope of use of the device.

[0016] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the implementation methods of the present application, the drawings required for use in the implementation methods will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a schematic diagram of the overall structure of a small-sized flexible soybean harvesting device for hilly areas according to an embodiment of the present application;

[0019] Figure 2 This is a structural exploded diagram of a small-sized flexible soybean harvesting device for hilly areas according to an embodiment of the present application;

[0020] Figure 3 It is a schematic diagram of a partial structure of a small-sized flexible soybean harvesting device for hilly areas according to an embodiment of the present application, viewed from above;

[0021] Figure 4 is a schematic diagram of the top view of the bottom belt assembly according to an embodiment of the present application;

[0022] Figure 5 is a schematic diagram of a top-view structure of a top belt assembly according to an embodiment of the present application;

[0023] Figure 6 is a side view of a small flexible gripping soybean harvesting device for hilly areas according to an embodiment of the present application;

[0024] Figure 7 It is a schematic diagram of the partial structure of the connecting rod according to an embodiment of the present application.

[0025] Icons: 1. Frame; 11. Belt rack; 12. U-shaped rack; 2. Transmission assembly; 21. Active transmission shaft; 22. First bevel gear set; 221. First passive transmission shaft; 23. Worm gear assembly; 24. Second passive transmission shaft; 25. Second bevel gear set; 3. Bottom belt assembly; 31. Bottom pulley assembly; 311. Bottom active pulley; 312. Bottom driven pulley; 32. Bottom belt; 33. Tensioning assembly; 331. L-shaped rotating rod; 332. Bottom tensioning pulley; 3 33. Tension spring; 334. Fixing rod; 34. Pre-tightening assembly; 341. Pre-tightening fork rod; 342. Pre-tightening bolt; 4. Cutter; 41. Cutter shaft; 5. Top belt assembly; 51. Top pulley group; 511. Top driving pulley; 512. Top driven pulley; 52. Top belt; 53. Support frame; 531. Connecting rod; 532. Rotating member support rod; 533. Slide; 54. Top tensioning assembly; 541. Top tensioning pulley; 542. Rotating connecting rod; 55. Lifting member. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0027] In order to make the purpose, technical solutions and advantages of the implementation methods of this application clearer, the technical solutions in the implementation methods of this application will be clearly and completely described below in conjunction with the drawings in the implementation methods of this application. Obviously, the described implementation methods are part of the implementation methods of this application, not all of the implementation methods. Based on the implementation methods in this application, all other implementation methods obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0028] Embodiment 1, as Figure 1-Figure 7 As shown, a small flexible soybean clamping harvester for hilly areas according to an embodiment of the present application includes a frame 1, wherein a transmission assembly 2, a bottom belt assembly 3 and a cutter 4 are mounted on the frame 1, the transmission assembly 2 is used to drive the bottom belt assembly 3 and the cutter 4 to operate, the bottom belt assembly 3 includes two groups of correspondingly arranged belt units; the cutter 4 is arranged between the correspondingly arranged belt units in the bottom belt assembly 3 and is located on the bottom side of the bottom belt assembly 3.

[0029] Specifically, in the embodiments of the present application, Figure 1-Figure 3 As shown, the frame 1 includes a belt frame 11 for carrying the bottom belt assembly 3 and a U-shaped frame 12 for carrying the cutter 4.

[0030] like Figure 1-Figure 3 as well as Figure 6 As shown, the transmission assembly 2 includes an active transmission shaft 21 rotatably arranged on the belt frame 11, and a plurality of first bevel gear sets 22 and a worm gear assembly 23 are key-connected on the active transmission shaft 21. The other end of the first bevel gear set 22 is key-connected to the bottom belt assembly 3 through a first passive transmission shaft 221, and the other end of the worm gear assembly 23 is key-connected to a second passive transmission shaft 24. The second passive transmission shaft 24 is rotatably connected to the U-shaped frame 12, and the other end of the second passive transmission shaft 24 is key-connected to a second bevel gear set 25. It should be noted that in a specific embodiment of the present application, the bevel gear set is composed of two bevel gears meshing with each other and arranged at 90°, and the worm gear assembly 23 is composed of a worm gear and a worm gear meshing with each other. The active transmission shaft 21 can be externally connected to a power device, such as a motor or other existing technologies to make the active transmission shaft 21 rotate on the belt frame 11.

[0031] like Figure 2-Figure 4As shown, the belt unit of the bottom belt assembly 3 includes two groups of symmetrically arranged bottom pulley groups 31, bottom belts 32, multiple tensioning assemblies 33 and pre-tightening assemblies 34. One end of the bottom pulley group 31 is keyed to the first passive transmission shaft 221. It can be seen that when the active transmission shaft 21 is driven to rotate by an external force, it will drive the first bevel gear group 22 to rotate, and then the bevel gear thereon will drive the first passive transmission shaft 221 to rotate, so that the bottom pulley group 31 will run, and the other end of the bottom pulley group 31 is rotatably connected to the pre-tightening assembly 34, and the bottom belt 3 2 is set on the bottom pulley group 31 and cooperates with the bottom pulley group 31 in transmission. One end of the multiple tensioning components 33 is elastically rotatably connected to the belt frame 11, and the other end of the multiple tensioning components 33 is rotatably abutted against the inner side of the bottom belt 32. Through the setting of the elastic rotation connection, the tensioning component 33 provides a flexible tensioning action to the bottom belt 32 to avoid the bottom belt 32 from generating a strong clamping force when supporting the soybean straw. The pre-tensioning component 34 is connected to one end of the bottom pulley group 31 and is slidably connected to the belt frame 11, and the other end of the pre-tensioning component 34 is rotatably connected to the belt frame 11.

[0032] Specifically, the bottom pulley group 31 includes a bottom driving pulley 311 and a bottom driven pulley 312. The bottom driving pulley 311 is key-connected to the first passive transmission shaft 221. The bottom driven pulley 312 is rotatably connected to the preload assembly 34. The bottom belt 32 is sleeved on the bottom driving pulley 311 and the bottom driven pulley 312. It can be seen that when the bottom driving pulley 311 is driven by the first passive transmission shaft 221 to rotate, the bottom driven pulley 312 will be driven to rotate synchronously in the same direction through the bottom belt 32.

[0033] like Figure 2-Figure 4 As shown, the tensioning assembly 33 includes an L-shaped rotating rod 331, the corner of the L-shaped rotating rod 331 is rotatably connected to the belt frame 11, one end of the L-shaped rotating rod 331 is rotatably connected to the bottom tensioning wheel 332, the bottom tensioning wheel 332 abuts against the inner side of the bottom belt 32, the other end of the L-shaped rotating rod 331 is hung with a tension spring 333, the other end of the tension spring 333 is hung on a fixed rod 334, wherein a plurality of fixed rods 334 are arranged in a group, each group of fixed rods 334 corresponds to the same tension spring 333, and the fixed rod 334 is fixedly connected to the belt frame 11. It can be seen that by 33 is hung on different fixed rods 334 in the same group, which will enable the L-shaped rotating rod 331 to provide different sizes of elastic forces to the bottom tensioning wheel 332, and the L-shaped rotating rod 331 to apply different sizes of elastic forces to the bottom belt 32, so that the bottom belt 32 will have different sizes of tensioning forces. It can be understood that the distance between two symmetrically arranged bottom belts 32 in the same group can also be adjusted in this way, which will enable the device to achieve different sizes of flexible clamping forces for soybean straw and be suitable for straw of different thicknesses, thereby improving the scope of use.

[0034] Furthermore, the pre-tightening assembly 34 includes a pre-tightening fork rod 341 and a pre-tightening bolt 342, one end of the pre-tightening fork rod 341 is rotatably connected to the bottom driven pulley 312, and the pre-tightening fork rod 341 is slidably connected to the belt frame 11; the pre-tightening bolt 342 is rotatably connected to the belt frame 11, and the pre-tightening bolt 342 and the pre-tightening fork rod 341 are threadedly matched with one end away from the bottom driven pulley 312. It can be seen that by rotating the pre-tightening bolt 342, the pre-tightening fork rod 341 can drive the bottom driven pulley 312 to move along the axial direction of the pre-tightening bolt 342, so that the bottom driven pulley 312 can move forward or backward, and further cooperate with the tensioning assembly 33 to achieve the tensioning degree of the bottom belt 32 and the change of the spacing between two symmetrical bottom belts 32 in the same group.

[0035] like Figure 3 and Figure 6 As shown, the cutter 4 is coaxially keyed with a cutter shaft 41, and the cutter shaft 41 is keyed to the other end of the second bevel gear set 25. It can be seen that the rotation of the active transmission shaft 21 will drive the worm gear assembly 23 to rotate, further drive the second passive transmission shaft 24 to rotate, and then drive the second bevel gear set 25 to rotate, and synchronously drive the cutter shaft 41 to drive the cutter 4 to rotate, thereby realizing the cutting action of the soybean straw.

[0036] It can be understood that at this time, the transmission component 2 will drive two groups of symmetrically arranged bottom belts 32 to clamp and fix the soybean straw, and the rotation of the cutter 4 will cut the soybean straw. The cut soybean straw will be clamped by two symmetrically arranged bottom belts 32 and transported to the rear. This realizes automatic harvesting of soybeans and reduces manual labor. However, during the cutting process and the backward transportation of the straw, the stability of the straw on it is not high only by the clamping and fixing of the bottom belts 32. Once tilting or shaking occurs, it is very easy to cause the bean pods on the straw to burst during the collision, causing the soybeans inside to fall, thereby reducing the soybean harvesting efficiency.

[0037] Embodiment 2, as Figure 1 , Figure 2 , Figure 5-Figure 7 As shown, a small flexible soybean clamping harvester for hilly areas according to an embodiment of the present application also includes a top belt assembly 5, which is stacked on the top side of the bottom belt assembly 3. The top belt assembly 5 can be raised and lowered on the frame 1. The top belt assembly 5, like the bottom belt assembly 3, also includes two groups of corresponding belt units.

[0038] Among them, the belt unit of the top-level belt assembly 5 includes two symmetrically arranged groups of top-level pulley groups 51, a top-level belt 52, a support frame 53 and multiple top-level tensioning assemblies 54; the top-level pulley group 51 includes a top-level driving pulley 511 and a top-level driven pulley 512, the top-level driving pulley 511 is coaxially connected to the first passive transmission shaft 221 with a sliding key, and the top-level driven pulley 512 is coaxially connected to the bottom-level driven pulley 312 with a sliding key. It can be seen that the top-level driving pulley 511 and the top-level driven pulley 512 can be axially displaced relative to the bottom-level driving pulley 311 and the bottom-level driven pulley 312, wherein the top-level driven pulley 512 is connected by a sliding key through a rotating shaft on the bottom-level driven pulley 312.

[0039] Among them, the top belt 52 is sleeved on the top driving pulley 511 and the top driven pulley 512; the support frame 53 includes a connecting rod 531 and a plurality of rotating support rods 532, and the connecting rod 531 is lifted and lowered on the belt frame 11. Specifically, a lifting member 55 is connected between the connecting rod 531 and the belt frame 11. It can be understood that the lifting member 55 can drive the connecting rod 531 to move up and down through the extension and contraction of the lifting member 55.

[0040] It should be noted that one end of the connecting rod 531 is slidably sleeved on the first passive transmission shaft 221, and the other end of the connecting rod 531 is coupled to the shaft between the bottom driven pulley 312 and the top driven pulley 512. Therefore, it can be further understood that the lifting and lowering of the connecting rod 531 will synchronously drive the top driving pulley 511 and the top driven pulley 512 to lift and lower. It should be further noted that one end of the connecting rod 531 located at the top driven pulley 512 is provided with a slide groove 533 (such as Figure 7 As shown), the shaft between the bottom driven pulley 312 and the top driven pulley 512 ( Figure 7 The driven shaft (as shown in the figure) is slidably inserted into the slide groove 533. It can be understood that the existence of the slide groove 533 enables the top driven pulley 312 to be synchronously displaced on the connecting rod 531 when the preload fork rod 341 drives the bottom driven pulley 312 to be displaced.

[0041] Furthermore, a plurality of rotating member support rods 532 are evenly fixed to the connecting rod 531; the top tensioning assembly 54 includes a top tensioning wheel 541 and a rotating connecting rod 542, the top tensioning wheel 541 is rotatably connected to one end of the rotating connecting rod 542, the rotating connecting rod 542 is rotatably connected to the rotating member support rod 532, and the other end of the rotating connecting rod 542 is telescopically fixed to the L-shaped rotating rod 331, as shown in FIG. Figure 2 As shown, the rotating connecting rod 542 is provided with a section in the height direction so as to facilitate its fixation on the L-shaped rotating rod 331 .

[0042] It should be noted that in the specific embodiment of the present application, the rotating member support rod 532 and the rotating shaft at the corner of the L-shaped rotating rod 331 are slidably connected, and the rotating connecting rod 542 and the rotating shaft at the corner of the L-shaped rotating rod 331 are connected by a sliding key, that is, the rotating connecting rod 542 and the L-shaped rotating rod 331 can rotate synchronously in the same direction relative to the rotating member support rod 532 (the axis between the L-shaped rotating rod 331 and the belt frame 11 is rotatably installed on the belt frame 11, and is designed to be key-connected to the L-shaped rotating rod 331), and a section of the rotating connecting rod 542 in the height direction is telescopically designed, and specifically, a part of it can be slidably inserted into the rotating rod 542. The design method connected to the other part makes it possible for the rotating support rod 532 and the rotating connecting rod 542 to be lifted and lowered synchronously when the connecting rod 531 is lifted and lowered, thereby ensuring that the top-level tensioning wheel 541 can be lifted and lowered synchronously accordingly. When the L-shaped rotating rod 331 rotates, it will synchronously drive the rotating connecting rod 542 to rotate. In this way, it can be understood that when the bottom-level tensioning wheel 332 below provides different tensioning forces to the bottom-level belt 32, the top-level tensioning wheel 541 will synchronously apply the same tensioning force to the top-level belt 52 to ensure that the bottom-level belt 32 and the top-level belt 52 have the same clamping force on the soybean straw.

[0043] It should be noted that the lifting member 55 can be an electric push rod or other device with a specific linear reciprocating displacement function in the prior art, which will not be described in detail here.

[0044] It can be understood that when harvesting soybeans, the soybean straw will be clamped and fixed by the bottom belt 32 and the top belt 52 to form an upper and lower layer respectively. Therefore, during the cutting process and the process of transporting to the rear, the soybean straw will always maintain the upper and lower double-layer clamping, and the stability of the straw is guaranteed. This will reduce the shaking, tilting and other conditions of the soybean straw, reduce the phenomenon of soybean pods bursting due to collision, and improve the soybean harvesting efficiency.

[0045] It should be noted that the specific models and specifications of the first bevel gear set 22, the worm gear assembly 23, the second bevel gear set 25, the tension spring 333, the pre-tightening bolt 342 and the cutter 4 need to be selected and determined according to the actual specifications of the device, etc. The specific selection and calculation method adopts the existing technology in the field, so it will not be described in detail.

[0046] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A small flexible soybean harvesting device for hilly areas, characterized in that: It comprises a frame (1), characterized in that: The frame (1) is provided with a transmission assembly (2), a bottom belt assembly (3), a cutter (4) and a top belt assembly (5); the transmission assembly (2) is used to drive the bottom belt assembly (3), the cutter (4) and the top belt assembly (5) to operate; the bottom belt assembly (3) and the top belt assembly (5) respectively include two groups of corresponding belt units; the top belt assembly (5) is stacked on the top side of the bottom belt assembly (3); and the top belt assembly (5) can be raised and lowered on the frame (1); The cutter (4) is arranged between corresponding belt units in the bottom belt assembly (3) and is located on the bottom side of the bottom belt assembly (3).

2. A small-sized flexible soybean harvesting device for hilly areas as claimed in claim 1, characterized in that: The frame (1) comprises a belt frame (11) for carrying the bottom belt assembly (3) and a U-shaped frame (12) for carrying the cutter (4).

3. A small-sized flexible soybean harvesting device for hilly areas as claimed in claim 2, characterized in that: The transmission assembly (2) comprises an active transmission shaft (21) rotatably arranged on the belt frame (11); a plurality of first bevel gear sets (22) and a worm gear assembly (23) are key-connected to the active transmission shaft (21); the other end of the first bevel gear set (22) is key-connected to the bottom belt assembly (3) via a first passive transmission shaft (221); the other end of the worm gear assembly (23) is key-connected to a second passive transmission shaft (24); the second passive transmission shaft (24) is rotatably connected to the U-shaped frame (12); the other end of the second passive transmission shaft (24) is key-connected to a second bevel gear set (25).

4. A small-sized flexible soybean harvesting device for hilly areas as claimed in claim 3, characterized in that: The belt unit of the bottom belt assembly (3) comprises two groups of symmetrically arranged bottom pulley groups (31), a bottom belt (32), a plurality of tensioning assemblies (33) and a pre-tensioning assembly (34); one end of the bottom pulley group (31) is key-connected to the first passive transmission shaft (221); the other end of the bottom pulley group (31) is rotatably connected to the pre-tensioning assembly (34); the bottom belt (32) is sleeved on the bottom pulley group (31) and cooperates with the bottom pulley group (31) in transmission; one end of the plurality of tensioning assemblies (33) is elastically rotatably connected to the belt frame (11); the other end of the plurality of tensioning assemblies (33) is rotatably abutted against the inner side of the bottom belt (32); one end of the pre-tensioning assembly (34) connected to the bottom pulley group (31) is slidably connected to the belt frame (11); the other end of the pre-tensioning assembly (34) is rotatably connected to the belt frame (11).

5. A small-sized flexible soybean harvesting device for hilly areas as claimed in claim 4, characterized in that: The bottom pulley group (31) comprises a bottom driving pulley (311) and a bottom driven pulley (312); the bottom driving pulley (311) and the first passive transmission shaft (221) are key-connected; the bottom driven pulley (312) is rotatably connected to the pre-tightening assembly (34); and the bottom belt (32) is sleeved on the bottom driving pulley (311) and the bottom driven pulley (312).

6. A small-sized flexible soybean harvesting device for hilly areas as claimed in claim 5, characterized in that: The tensioning assembly (33) comprises an L-shaped rotating rod (331), the corner of the L-shaped rotating rod (331) is rotatably connected to the belt rack (11), one end of the L-shaped rotating rod (331) is rotatably connected to a bottom tensioning wheel (332), the bottom tensioning wheel (332) abuts against the bottom belt (32), the other end of the L-shaped rotating rod (331) is hung with a tension spring (333), the other end of the tension spring (333) is hung on a fixed rod (334), a plurality of the fixed rods (334) are arranged as a group, each group of the fixed rods (334) corresponds to the same tension spring (333), and the fixed rods (334) are fixedly connected to the belt rack (11).

7. A small-sized flexible soybean harvesting device for hilly areas as claimed in claim 5, characterized in that: The pre-tightening assembly (34) comprises a pre-tightening fork rod (341) and a pre-tightening bolt (342), one end of the pre-tightening fork rod (341) is rotatably connected to the bottom driven pulley (312), and the pre-tightening fork rod (341) is slidably connected to the belt rack (11); The pre-tightening bolt (342) is rotatably connected to the belt frame (11), and the pre-tightening bolt (342) and an end of the pre-tightening fork rod (341) away from the bottom driven pulley (312) are threadedly matched.

8. A small-sized flexible soybean harvesting device for hilly areas as claimed in claim 3, characterized in that: The cutter (4) is coaxially keyed to a cutter shaft (41), and the cutter shaft (41) is keyed to the other end of the second bevel gear set (25).

9. A small-sized flexible soybean harvesting device for hilly areas as claimed in claim 6, characterized in that: The belt unit of the top belt assembly (5) comprises two symmetrically arranged groups of top belt pulleys (51), a top belt (52), a support frame (53) and a plurality of top tensioning assemblies (54); The top pulley assembly (51) comprises a top driving pulley (511) and a top driven pulley (512); the top driving pulley (511) is coaxially keyed to the first passive transmission shaft (221); and the top driven pulley (512) is coaxially keyed to the bottom driven pulley (312); The top layer belt (52) is sleeved on the top layer driving pulley (511) and the top layer driven pulley (512); The support frame (53) comprises a connecting rod (531) and a plurality of rotating member support rods (532); the connecting rod (531) is lifted and lowered on the belt frame (11); one end of the connecting rod (531) is slidably sleeved on the shaft between the bottom driving pulley (311) and the top driving pulley (511); the other end of the connecting rod (531) is coupled to the shaft between the bottom driven pulley (312) and the top driven pulley (512); and the plurality of rotating member support rods (532) are evenly fixed to the connecting rod (531); The top tensioning assembly (54) comprises a top tensioning wheel (541) and a rotating connecting rod (542), wherein the top tensioning wheel (541) is rotatably connected to one end of the rotating connecting rod (542), the rotating connecting rod (542) and the rotating member support rod (532) are rotatably connected, and the other end of the rotating connecting rod (542) is telescopically fixed to the L-shaped rotating rod (331).

10. A small-sized flexible soybean harvesting device for hilly areas as claimed in claim 9, characterized in that: A lifting member (55) is connected between the connecting rod (531) and the belt frame (11).

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