Combine harvester for small-grain beans

Abstract

A threshing mechanism of the small-grain type bean combine harvester is used for separating grains from straw and threshing the grains, a screening mechanism is located below the threshing mechanism and used for receiving the grains, and a first receiving mechanism and a second receiving mechanism are sequentially arranged below the screening mechanism. The material screening mechanism enables grains to be conveyed from front to back through vibration, the grains which are successfully threshed leak the material screening mechanism and fall into the first material receiving mechanism, the first material receiving mechanism is connected with the grain box to collect the grains, and the grains which are not successfully threshed fall into the second material receiving mechanism from an outlet of the material screening mechanism. The second material receiving mechanism is connected to the threshing mechanism and is used for conveying unsuccessfully threshed grains back to the threshing mechanism for re-threshing operation; and the discharging fan works to provide wind power, so that the straws and the threshed shells are blown to the grass collector at the output end. The process of screening and threshing is mechanically completed, seed collection and impurity collection are completed, manual operation is replaced by a machine, the harvesting efficiency is improved, and the labor cost is reduced.

Description

Technical Field

[0001] The invention relates to agricultural mechanical equipment, and more particularly to a small-grain bean combine harvester. Background Art

[0002] Small-grain beans are important crops in various regions of my country, and are of great significance to promoting farmers' income and enriching the planting structure. At present, the harvest of small-grain beans is still mostly done manually. The process is first cut down manually, then dried, bundled and taken back, and then beaten with a tractor or a stick by hand until the grains and shells are separated, and then sorted with a fan. The traditional method has problems such as labor shortage, high labor costs, and low production efficiency, which seriously restricts the development of the small-grain bean industry. Summary of the invention

[0003] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a small-grain bean combine harvester, which can fully thresh, remove impurities and collect the beans through the coordinated arrangement of a threshing mechanism, a screening mechanism and a receiving mechanism, and can thresh and screen the remaining parts again to improve the success rate of grain threshing and harvesting.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical scheme: a small-grain bean combine harvester, comprising a vehicle body, on which a cutting table, a conveyor, a threshing mechanism, a screening mechanism, a first material receiving mechanism, a second material receiving mechanism, a discharge fan, a grain box and a grass collector are arranged, the cutting table, the conveyor and the threshing mechanism are connected in sequence to cut and transport the straw, the threshing mechanism is used to separate the grains from the straw and thresh the grains, the screening mechanism is located below the threshing mechanism to receive the grains, and the first material receiving mechanism and the second material receiving mechanism are arranged in sequence below the screening mechanism The screening mechanism transports the grains from front to back through vibration, and the successfully threshed grains pass through the screening mechanism and fall into the first receiving mechanism, which connects to the grain box to collect the grains, and the unsuccessfully threshed grains fall from the outlet of the screening mechanism to the second receiving mechanism, which is connected to the threshing mechanism to transport the unsuccessfully threshed grains back to the threshing mechanism for re-threshing; the discharge fan is arranged in front of the screening mechanism, and the grass collector is arranged behind the threshing mechanism and the screening mechanism, and the discharge fan provides wind force to blow the straw and the threshed shell to the grass collector at the output end.

[0005] As an improvement, the screening mechanism is a vibrating screen, which includes a wave push plate, a conveying spring tooth, a screen tooth piece and a bottom net. The wave push plate and the conveying spring tooth are arranged in sequence at the front, the screen tooth piece is located below the conveying spring tooth and extends to the outlet end, and the bottom net is located directly below the screen tooth piece. The wave push plate is used to push the material fallen thereon backwards during vibration; a number of conveying spring teeth are arranged at intervals along the width direction to perform preliminary screening of the material, so that small grains fall below through the gaps, and large stems are pushed backwards during vibration; a number of screen tooth pieces are arranged at intervals along the conveying direction to perform secondary screening of the material, the grains fall through the gaps between the screen tooth pieces, and the residues are transported backwards by the wind force and vibration of the discharge fan; the bottom net is in a grid shape, the grains fall downward through the grid to the first material receiving mechanism, and the residues are transported backwards by the wind force of the discharge fan.

[0006] As an improvement, the outlet end of the screen teeth is also provided with an auxiliary material receiving piece and a material receiving chute. The auxiliary material receiving piece is set at a height corresponding to the screen teeth, and a plurality of auxiliary material receiving pieces are arranged at intervals along the width direction to screen the material again, so that the unsuccessfully threshed grains fall below through the gaps, and the large stems are transported outward to the grass collector by the wind force of the discharge fan. The material receiving chute is located below the auxiliary material receiving piece to receive the unsuccessfully threshed grains, and the lower end of the material receiving chute corresponds to the second material receiving mechanism.

[0007] As an improvement, a number of screen teeth are arranged in parallel on a first mounting link and a second mounting link. The second mounting link is also connected to the outside with an adjusting link. When the adjusting link is operated, the second mounting link is driven to move forward and backward, thereby adjusting the forward inclination angle of a number of screen teeth, thereby adjusting the screening effect and feeding speed.

[0008] As an improvement, the first material receiving mechanism includes a first material receiving chamber, a first auger, a feeding fan and a feeding channel. The first auger is arranged in the first material receiving chamber and is used to transport the grains falling into the first material receiving chamber to the outlet end when rotating. The outlet end is connected to the inlet of the feeding channel. The feeding fan is connected to the inlet of the feeding channel and is used to transport the grains to the grain box by wind.

[0009] As an improvement, the grain box is located above the vehicle body, the feeding channel is arranged from bottom to top, and the grains are transported upward by the wind force of the feeding fan.

[0010] As an improvement, the second material receiving mechanism includes a second material receiving chamber, a second auger, a vertical feeding channel, a vertical auger, a horizontal feeding channel and a horizontal auger. The second auger is arranged in the second material receiving chamber for conveying the material falling into the second material receiving chamber to the outlet end during rotation. The vertical auger is arranged in the vertical feeding channel for conveying the material entering the vertical feeding channel to the outlet end during rotation. The horizontal auger is arranged in the horizontal feeding channel for conveying the material entering the horizontal feeding channel to the outlet end during rotation. The second material receiving chamber, the vertical feeding channel and the horizontal feeding channel are connected in sequence and the outlet end of the horizontal feeding channel extends to the inlet end of the threshing mechanism for conveying the material to the inlet end of the threshing mechanism for re-threshing operation.

[0011] As an improvement, a small diameter reel is arranged on the upper front of the cutting table to perform the reeling action.

[0012] As an improvement, track wheels are arranged under the vehicle body, and the width of the cutting table is greater than the width of the track wheels.

[0013] Beneficial effects of the present invention:

[0014] 1. Through the coordinated setting of threshing mechanism, screening mechanism and receiving mechanism, sufficient threshing, impurity removal and collection are carried out.

[0015] 2. The remaining parts can be threshed and screened again to ensure the adequacy of grain threshing and collection, avoid waste, and avoid the increase in time and labor costs caused by subsequent manual supplementary screening.

[0016] 3. Through mechanization, the screening and threshing process can be completed, and the grains and debris can be collected, so that machines can replace people, improve harvesting efficiency and reduce labor costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic structural diagram of the harvester of the present invention.

[0018] Figure 2 It is a longitudinal sectional structural schematic diagram of the threshing, screening and receiving mechanism of the present invention.

[0019] Figure 3 The three-dimensional structure of the threshing, screening and receiving mechanism of the present invention is shown in FIG. Figure 1 .

[0020] Figure 4 for Figure 3 Enlarged view of point B in the middle.

[0021] Figure 5 for Figure 3 Enlarged view of point C in the middle.

[0022] Figure 6The three-dimensional structure of the threshing, screening and receiving mechanism of the present invention is shown in FIG. Figure 2 .

[0023] Figure 7 for Figure 6 Enlarged view of point D in the middle.

[0024] Figure 8 It is a schematic diagram of the three-dimensional structure of the first material receiving mechanism of the present invention.

[0025] Fig. 9 It is a schematic diagram of the three-dimensional structure of the second material receiving mechanism of the present invention.

[0026] Fig.10 It is a perspective structural schematic diagram of the second material receiving mechanism of the present invention.

[0027] Fig.11 for Figure 2 Enlarged view of point A in the middle. DETAILED DESCRIPTION

[0028] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0029] like Figure 1-11 As shown, a specific embodiment of the small-grain bean combine harvester of the present invention comprises a vehicle body 0, on which a cutting table 01, a conveyor 02, a threshing mechanism 1, a screening mechanism 2, a first material receiving mechanism 3, a second material receiving mechanism 4, a discharge fan 5, a grain box 6 and a grass collector 7 are arranged. The cutting table 01, the conveyor 02 and the threshing mechanism 1 are sequentially connected to cut and transport the straw. The threshing mechanism 1 is used to separate the grains from the straw and thresh the grains. The screening mechanism 2 is located below the threshing mechanism 1 to receive the grains. The first material receiving mechanism 3 and the second material receiving mechanism 4 are sequentially arranged below the screening mechanism 2. The screening mechanism 2 transports the grains from front to back by vibration, and the successfully threshed grains pass through the screening mechanism 2 and fall into the first receiving mechanism 3, which connects to the grain box 6 to collect the grains, and the unsuccessfully threshed grains fall from the outlet of the screening mechanism 2 to the second receiving mechanism 4, which is connected to the threshing mechanism 1 to transport the unsuccessfully threshed grains back to the threshing mechanism 1 for re-threshing; the discharge fan 5 is arranged in front of the screening mechanism 2, and the grass collector 7 is arranged behind the threshing mechanism 1 and the screening mechanism 2, and the discharge fan 5 provides wind force to blow the straw and the threshed shell to the grass collector 7 at the output end.

[0030] When the present invention is in use, the driver drives the small-grain bean combine harvester to align the small-grain bean straw, and then drives towards the small-grain bean straw. The small-grain bean straw is cut down by the cutting table 01 and enters the threshing mechanism 1 through the conveyor 02. The conveyor 02 can use a mature conveyor belt in the prior art to transport the straw. The threshing mechanism 1 can use a mature threshing drum structure in the prior art to transport the straw from the input end to the output end. During the process, the grains and the straw are separated and the grains are threshed. The grains and straw with reduced volume fall from the gap of the threshing mechanism 1 to the screening mechanism 2. The screening mechanism 2 is a vibrating screen, which transports the grains and the straw from the input end to the output end through periodic vibration. During the process, the grains are further threshed. The grains with reduced volume fall from the gap to the first receiving mechanism 3 for collection, and are transported to the grain box 6 for collection. Unsuccessfully threshed and incompletely separated grains, straw and other mixed and residual materials fall from the outlet of the screening mechanism 2 to the second receiving mechanism 4, and the second receiving mechanism 4 transports the materials back to the threshing drum for re-threshing, thereby improving the success rate of grains through another threshing and screening, avoiding the time and cost increase of subsequent manual screening. The discharge fan 5 relies on wind power to provide power for the output of straw, shells and other residual materials in the entire shell, and the grains can fall by their own weight. On the one hand, the straw, shells and other residual materials at the threshing mechanism 1 and the screening mechanism 2 are output to the conveying end by the operation of the threshing mechanism 1 and the screening mechanism 2, and at the same time, the wind power of the discharge fan 5 is relied on to promote the transportation of the residual materials, and blow them to the grass collector 7 at the output end to complete the collection of the residual materials.

[0031] As an improved specific implementation method, the screening mechanism 2 is a vibrating screen, which includes a wave pushing plate 21, a conveying spring tooth 22, a screen tooth piece 23 and a bottom net 24. The wave pushing plate 21 and the conveying spring tooth 22 are arranged in sequence at the front, the screen tooth piece 23 is located below the conveying spring tooth 22 and extends all the way to the outlet end, and the bottom net 24 is located directly below the screen tooth piece 23. The wave pushing plate 21 is used to push the material falling thereon backward during vibration; a number of conveying spring teeth 22 are arranged at intervals along the width direction to perform preliminary screening of the material, so that small seeds fall below through the gaps, and large stems are pushed backward during vibration; a number of screen tooth pieces 23 are arranged at intervals along the conveying direction to perform secondary screening of the material, and the seeds fall through the gaps of the screen tooth pieces 23, and the residues are transported backwards by the wind force and vibration of the discharge fan 5; the bottom net 24 is in a grid shape, and the seeds fall downwards through the grid to the first material receiving mechanism 3, and the residues are transported backwards by the wind force of the discharge fan 5.

[0032] like Figure 2 , 3As shown in Figures 4, 6, and 7, the seeds and stalks separated by the threshing mechanism 1 first fall to the wave push plate 21. The wave push plate 21 does not screen or drop materials. The materials falling on it are distributed on the wave push plate 21 in an orderly manner through vibration. With the orderly forward transportation of the vibration, the materials are dispersed, which is conducive to the subsequent screening of materials. The conveying spring teeth 22 receive the materials coming from the wave push plate 21 or the materials falling from the threshing mechanism 1. The conveying spring teeth 22 are arranged at intervals. Small seeds can fall onto the screen teeth 23, and large stalks are pushed backwards during vibration. Then, the seeds and stalks are separated by the setting of the conveying spring teeth 22. The threshed seeds and the unsuccessfully threshed seeds can fall onto the screen teeth 23 in advance, and the screen teeth 23 are used for threshing and screening, thereby improving the efficiency of screening and threshing. The screen teeth 23 receives the material from the conveying spring teeth 22 or receives the material falling from the threshing mechanism 1. The screen teeth 23 promotes the separation of the grains and the shells by its tooth structure. The successfully threshed grains fall through the gaps of the screen teeth 23, and the shells, straw and other debris cannot pass through the gaps of the screen teeth 23, and are then transported backwards under the vibration and wind force of the discharge fan 5. The grid-shaped bottom net 24 buffers the falling of the grains, and then the grains continue to fall through the grid to the first receiving mechanism 3. The discharge fan 5 blows backwards in the entire shell by wind force, so that the debris is transported to the grass collector 7 at the output end. After leaving the outlet end of the screen teeth 23, the unsuccessfully threshed grains fall to the second receiving mechanism 4 by their own weight.

[0033] As an improved specific implementation method, the outlet end of the screen tooth plate 23 is also provided with an auxiliary material receiving plate 25 and a material receiving chute 26. The auxiliary material receiving plate 25 is set at a height corresponding to the screen tooth plate 23, and a plurality of auxiliary material receiving plates 25 are arranged at intervals along the width direction to screen the material again, so that the unsuccessfully threshed grains fall below through the gaps, and the large stems are transported outward to the grass collector 7 by the wind force of the discharge fan 5. The material receiving chute 26 is located below the auxiliary material receiving plate 25 to receive the unsuccessfully threshed grains, and the lower end of the material receiving chute 26 corresponds to the second material receiving mechanism 4.

[0034] As an improved specific implementation manner, continuous steps 251 for receiving the straw are provided on the auxiliary receiving piece 25 along the conveying direction.

[0035] like Figure 2 , 3 As shown in FIG. 5 , the step 251 can increase the support and friction for the large straws, and the straws are continuously transported outward in a bumpy manner when the wind of the discharge fan 5 blows, thereby promoting the separation of the straws and the grains.

[0036] like Figure 2 , 3As shown in Figures 5 and 6, smaller debris can be blown directly backwards by the wind force of the discharge fan 5 to the grass collector 7 for collection; and the debris leaving the outlet end of the screen tooth plate 23 may include larger straws. By providing an auxiliary receiving piece 25, such larger straws can be received and continued to be blown backwards by the wind force of the discharge fan 5 until they fall outwards to the grass collector 7. Some unsuccessfully threshed grains mixed with such straws can fall down through the gaps between the auxiliary receiving pieces 25, and the receiving chute 26 cushions the fallen unsuccessfully threshed grains and allows them to slide toward the second receiving mechanism 4.

[0037] As an improved specific implementation method, a plurality of screen teeth 23 are arranged in parallel on a first mounting link 231 and a second mounting link 232. The second mounting link 232 is also externally connected to an adjusting link 233. When the adjusting link 233 is operated, the second mounting link 232 is driven to move forward and backward, thereby adjusting the forward tilt angle of the plurality of screen teeth 23, thereby adjusting the screening effect and the feeding speed.

[0038] like Figure 2 , 3 As shown in Figures 4, 6, and 7, each sieve tooth piece 23 forms a parallelogram structure with the first mounting link 231 and the second mounting link 232. The first mounting link 231 serves as the rotation axis of the sieve tooth piece 23. The sieve tooth piece 23 rotates around the axis at the first mounting link 231 through the swing of the second mounting link 232, thereby adjusting the forward tilt angle of the sieve tooth piece 23. Several sieve tooth pieces 23 face the output end, and changing their forward tilt angle can adjust the size of the gap between the sieve tooth pieces 23 and the size of the cargo space between the sieve tooth pieces 23. By changing the forward tilt angle, the screening effect and feeding speed can be adjusted to meet the flexible screening requirements. The adjustment link 233 is connected to the second mounting link 232 and can be extended outside the frame to facilitate manual operation by the operator, or to connect to an external power source for automatic adjustment and control.

[0039] As an improved specific embodiment, the first material receiving mechanism 3 includes a first material receiving chamber 31, a first auger 32, a feeding fan 33 and a feeding channel 34. The first auger 32 is arranged in the first material receiving chamber 31 and is used to transport the grains falling into the first material receiving chamber 31 to the outlet end when rotating. The outlet end is connected to the entrance of the feeding channel 34. The feeding fan 33 is connected to the entrance of the feeding channel 34 and is used to transport the grains to the grain box 6 by wind.

[0040] like Figure 2 , 3As shown in FIGS. 6 and 8, the grains fall into the first receiving chamber 31, and the first auger 32 is driven to rotate by the power source to transport the grains to the outlet end to the entrance of the feeding channel 34, and then the grains are sent to the grain box 6 by the wind force of the feeding fan 33 to complete the collection. The front section is transported by the auger, and the rear section is transported by wind force, which can avoid the squeezing and damage of the grains by the traditional elbow conveying pipeline, and the small straw, shell and other debris that inevitably fall into the first receiving chamber 31 during the whole screening and threshing process. The front section auger and the rear section wind force conveying method avoids the possibility of debris blocking the elbow position.

[0041] As an improved specific implementation manner, the grain box 6 is located above the vehicle body 0, the feeding channel 34 is arranged from bottom to top, and the grains are transported upward by the wind force of the feeding fan 33.

[0042] like Figure 1 , 8 As shown, the grain box 6 is arranged in the open space above the vehicle body 0, so that the space can be better utilized. The grain box 6 arranged above can also realize the quick dumping of grain, and it can avoid arranging some elbow systems to unload the grain, so as to avoid squeezing damage to the grains.

[0043] As an improved specific embodiment, the feeding channel 34 includes a horizontal section 341 and a vertical section 342 connected in sequence, one side of the horizontal section 341 is open and connected to the feeding fan 33, the upper part of the horizontal section 341 is open and connected to the outlet end of the first receiving chamber 31, and the vertical section 342 extends from bottom to top to transport the grains to a high outlet.

[0044] like Figure 1 , 8 As shown, the grains fall into the feeding channel 34 from the upper opening of the horizontal section 341 , and are then driven by the wind force of the feeding fan 33 on one side to transport the grains upward along the vertical section 342 , and the upper end of the vertical section 342 is connected to the grain box 6 .

[0045] As an improved specific implementation manner, the second material receiving mechanism 4 includes a second material receiving chamber 41, a second auger 42, a vertical feeding channel 43, a vertical auger 44, a horizontal feeding channel 45 and a horizontal auger 46. The second auger 42 is arranged in the second material receiving chamber 41 for conveying the material falling into the second material receiving chamber 41 to the outlet end during rotation. The vertical auger 44 is arranged in the vertical feeding channel 43 for conveying the material entering the vertical feeding channel 43 to the outlet end during rotation. The horizontal auger 46 is arranged in the horizontal feeding channel 45 for conveying the material entering the horizontal feeding channel 45 to the outlet end during rotation. The second material receiving chamber 41, the vertical feeding channel 43 and the horizontal feeding channel 45 are connected in sequence and the outlet end of the horizontal feeding channel 45 extends to the inlet end of the threshing mechanism 1 for conveying the material to the inlet end of the threshing mechanism 1 for re-threshing operation.

[0046] like Figure 2 , 3 As shown in , 6, 9, and 10, the material falls into the second receiving chamber 41, and the second auger 42 is driven to rotate by a power source to transport the grains to the outlet end to the entrance of the vertical feeding channel 43. The two sections of the vertical feeding channel 43 and the horizontal feeding channel 45 complete the upward and horizontal extension of the channel to the entrance end of the threshing mechanism 1, and the vertical auger 44 and the horizontal auger 46 rotate to transport the material in an orderly manner to the threshing mechanism 1 for re-threshing, which can avoid squeezing and damage of the transported grains.

[0047] As an improved specific implementation manner, first receiving inclined plates 35 are extended obliquely upward from the front and rear sides of the first material receiving cavity 31 , and the first receiving inclined plates 35 cover the front and rear material dropping positions of the screening mechanism 2 .

[0048] like Figure 2 , 3 As shown in FIG. 6 , the first receiving inclined plate 35 extends from both sides of the first receiving cavity 31 to form a larger receiving space, which is conducive to the receiving of materials and sliding them into the first receiving cavity 31 for collection.

[0049] As an improved specific implementation manner, second receiving inclined plates 36 are extended obliquely upward on both sides of the front and rear of the second material receiving chamber 41 , and the upper side of the second material receiving chamber 41 corresponds to the outlet end of the screening mechanism 2 .

[0050] like Figure 2 , 3 As shown in FIG. 6 , the second receiving inclined plate 36 extends from both sides of the second receiving cavity 41 to form a larger receiving space, which is conducive to the receiving of materials and sliding them into the second receiving cavity 41 for collection.

[0051] As an improved specific implementation, a small diameter reel 03 is provided on the upper front of the cutting table 01 to perform the reeling action.

[0052] like Figure 1 As shown, the small diameter reel 03 allows the reeling position to be closer to the bottom plate of the cutting table 01. The small diameter reel 03 pushes the small-grain bean straw toward the cutting table 01, which can effectively prevent the occurrence of grain falling.

[0053] As an improved specific implementation manner, track wheels 04 are arranged under the vehicle body 0 , and the width of the cutting platform 01 is greater than the width of the track wheels 04 .

[0054] like Figure 1 As shown, in a specific implementation, the widened cutting table 01 covers a larger crop width on the one hand to improve the harvesting efficiency of a single trip, and on the other hand covers the width of the track wheel 04 to prevent the track from crushing the crop.

[0055] As an improved specific implementation method, three air guide plates 51, namely, upper, middle and lower, are provided at the air outlet of the discharge fan 5. The upper and middle two air guide plates 51 form a first air guide channel 52, which is opposite to the direction of the screen teeth 23. The middle and lower two air guide plates 51 form a second air guide channel 53, which is opposite to the direction of the bottom net 24.

[0056] like Figure 2 , 3 As shown in Figure 11, two air guide channels, namely the first air guide channel 52 and the second air guide channel 53, are formed by three air guide plates 51, thereby efficiently concentrating the wind force of the discharge fan 5 to blow in the direction of the screen teeth 23 and the bottom net 24, ensuring that the wind force is effectively used to blow the miscellaneous materials, promoting the transportation of materials to the output end, and as little fine and miscellaneous materials as possible falling to the first material receiving mechanism 3.

[0057] As an improved specific implementation method, two upper and lower extension plates 54 are further arranged after the upper and middle air guide plates 51. The end of the upper extension plate 54 is connected to the junction of the wave pushing plate 21 and the conveying spring tooth 22, so that the first air guide channel 52 is opposite to the conveying spring tooth 22, and the lower extension plate 54 corresponds to the inlet end of the screen tooth plate 23.

[0058] like Figure 2 , 3 As shown in Figures 11, the two extension plates 54 further extend the opposite position of the first air guide channel 52, that is, between the conveying spring teeth 22 and the screen teeth 23, which ensures that the wind can act on the upper conveying spring teeth 22 to promote the transportation of materials.

[0059] The above are only preferred embodiments of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A small-grain bean combine harvester, comprising a vehicle body (0), characterized in that: The vehicle body (0) is provided with a cutting table (01), a conveyor (02), a threshing mechanism (1), a screening mechanism (2), a first material receiving mechanism (3), a second material receiving mechanism (4), a discharge fan (5), a grain box (6) and a grass collector (7). The cutting table (01), the conveyor (02) and the threshing mechanism (1) are sequentially connected to cut and convey the straw. The threshing mechanism (1) is used to separate the grains from the straw and thresh the grains. The screening mechanism (2) is located below the threshing mechanism (1) to receive the grains. The first material receiving mechanism (3) and the second material receiving mechanism (4) are sequentially arranged below the screening mechanism (2). The screening mechanism (2) vibrates to cause the grains to be threshed. The grains are transported from front to back, and the successfully threshed grains pass through the screening mechanism (2) and fall into the first receiving mechanism (3). The first receiving mechanism (3) is connected to the grain box (6) to collect the grains, and the unsuccessfully threshed grains fall from the outlet of the screening mechanism (2) to the second receiving mechanism (4). The second receiving mechanism (4) is connected to the threshing mechanism (1) and is used to transport the unsuccessfully threshed grains back to the threshing mechanism (1) for re-threshing. The discharge fan (5) is arranged in front of the screening mechanism (2), and the grass collector (7) is arranged behind the threshing mechanism (1) and the screening mechanism (2). The discharge fan (5) provides wind force to blow the straw and the shell of the threshed shell to the grass collector (7) at the output end.

2. A small-grain bean combine harvester according to claim 1, characterized in that: The screening mechanism (2) is a vibrating screen, comprising a wave pushing plate (21), a conveying spring tooth (22), a screen tooth piece (23) and a bottom net (24), wherein the wave pushing plate (21) and the conveying spring tooth (22) are sequentially arranged at the front, the screen tooth piece (23) is located below the conveying spring tooth (22) and extends all the way to the outlet end, the bottom net (24) is located directly below the screen tooth piece (23), and the wave pushing plate (21) is used to push the material falling thereon backwards during vibration; a plurality of conveying spring teeth (22) are provided at the front of the vibrating screen; The teeth (22) are arranged at intervals along the width direction to perform preliminary screening on the material, so that small seeds fall through the gaps and large straws are pushed backwards during vibration; a plurality of screen teeth (23) are arranged at intervals along the conveying direction to perform secondary screening on the material, so that seeds fall through the gaps between the screen teeth and the residue is conveyed backwards by the wind force and vibration of the discharge fan (5); the bottom net (24) is in the shape of a grid, so that seeds fall downwards through the grid to the first material receiving mechanism (3), and the residue is conveyed backwards by the wind force of the discharge fan (5).

3. The small-grain bean combine harvester according to claim 2, characterized in that: The outlet end of the sieve tooth plate (23) is also provided with an auxiliary material receiving plate (25) and a material receiving slideway (26). The auxiliary material receiving plate (25) is set at a height corresponding to the sieve tooth plate (23), and a plurality of auxiliary material receiving plates (25) are arranged at intervals along the width direction to screen the material again, so that the unsuccessfully threshed grains fall below through the gaps, and the large straws are transported outward to the grass collector (7) by the wind force of the discharge fan (5). The material receiving slideway (26) is located below the auxiliary material receiving plate (25) to receive the unsuccessfully threshed grains, and the lower end of the material receiving slideway (26) corresponds to the second material receiving mechanism (4).

4. The small-grain bean combine harvester according to claim 2, characterized in that: A plurality of screen teeth (23) are arranged in parallel on a first mounting link (231) and a second mounting link (232); the second mounting link (232) is further externally connected to an adjusting link (233); when the adjusting link (233) is operated, the second mounting link (232) is driven to move forward and backward, thereby adjusting the forward tilt angles of the plurality of screen teeth (23), thereby adjusting the screening effect and the feeding speed.

5. A small-grain bean combine harvester according to any one of claims 1 to 4, characterized in that: The first material receiving mechanism (3) comprises a first material receiving chamber (31), a first auger (32), a feeding fan (33) and a feeding channel (34); the first auger (32) is arranged in the first material receiving chamber (31) and is used to transport the grains falling into the first material receiving chamber (31) to the outlet end when rotating; the outlet end is connected to the inlet of the feeding channel (34); the feeding fan (33) is connected to the inlet of the feeding channel (34) and is used to transport the grains to the grain box (6) by wind power.

6. The small-grain bean combine harvester according to claim 5, characterized in that: The grain box (6) is located above the vehicle body (0), and the feeding channel (34) is arranged from bottom to top, and the grains are transported upward by the wind force of the feeding fan (33).

7. A small-grain bean combine harvester according to any one of claims 1 to 4, characterized in that: The second material receiving mechanism (4) comprises a second material receiving chamber (41), a second auger (42), a vertical material feeding channel (43), a vertical auger (44), a horizontal material feeding channel (45) and a horizontal auger (46); the second auger (42) is arranged in the second material receiving chamber (41) and is used to transport the material falling into the second material receiving chamber (41) to the outlet end when rotating; the vertical auger (44) is arranged in the vertical material feeding channel (43) and is used to transport the material entering the vertical material feeding channel (43) to the outlet end when rotating; the horizontal auger (46) is arranged in the horizontal material feeding channel (45) and is used to transport the material entering the horizontal material feeding channel (45) to the outlet end when rotating; the second material receiving chamber (41), the vertical material feeding channel (43) and the horizontal material feeding channel (45) are connected in sequence, and the outlet end of the horizontal material feeding channel (45) extends to the inlet end of the threshing mechanism (1) and is used to transport the material to the inlet end of the threshing mechanism (1) for re-threshing operation.

8. A small-grain bean combine harvester according to any one of claims 1 to 4, characterized in that: A small diameter reel (03) is arranged on the upper front of the cutting table (01) to perform reeling action.

9. A small-grain bean combine harvester according to any one of claims 1 to 4, characterized in that: Track wheels (04) are arranged below the vehicle body (0), and the width of the cutting table (01) is greater than the width of the track wheels (04).

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