Harvester unloading system capable of unloading grains through double-bottom augers

Abstract

The utility model provides a harvester unloading system with double bottom augers for unloading, the unloading system comprises a front bottom auger, a rear bottom auger, a grain outlet cylinder, a grain outlet auger and a first driving device, and the rear bottom auger and the front bottom auger are horizontally arranged in a grain tank in a vertically staggered manner; the grain outlet barrel is located at the opposite ends of the front bottom auger and the rear bottom auger, a first grain inlet is formed in the side wall of the bottom of the grain outlet barrel, a second grain inlet is formed in the side wall of the bottom of the grain outlet barrel, the grain outlet auger is arranged in the grain outlet barrel, and the height of the bottom of the grain outlet auger does not exceed the height of the first grain inlet; the first driving device drives the front bottom auger, the rear bottom auger and the grain outlet auger to rotate. The rear bottom auger and the front bottom auger are arranged in a vertically staggered mode, the front bottom auger is arranged to be lower than the rear bottom auger, the front bottom auger can stir lower stored grains in the grain tank, the rear bottom auger can stir upper discharged grains in the grain tank, and therefore layered stirring of the stored grains in the grain tank is achieved; and the grain unloading efficiency is improved by improving the stirring efficiency.

Description

Technical Field

[0001] The present application relates to the technical field of harvesters, and more particularly, to a grain unloading system for a harvester with a double-bottom auger for grain unloading. Background Art

[0002] The operating environment of large harvesters is often large farms. Such large plots have problems such as long operating hours and long operating distances. While continuously improving the operating efficiency of harvesters, the volume of the grain tank limits the persistence of operation. To increase the volume of the grain tank, the common practice is to increase the height of the grain tank by adding a grain tank cover. However, with the increase in the volume of the grain tank, the grain unloading device of the grain tank has not changed significantly, and the grain unloading speed cannot match the grain tank after the volume increase, thus affecting the grain unloading efficiency. Summary of the Utility Model

[0003] In view of this, the purpose of the embodiments of the present application is to provide a grain unloading system for a harvester with a double-bottom auger for grain unloading, so as to solve the technical problem of low grain unloading efficiency existing in the existing grain unloading device.

[0004] The embodiments of the present application provide a grain unloading system for a harvester with a double-bottom auger for grain unloading, which is used for unloading the grain in the grain tank of the harvester. The grain unloading system includes: a front bottom auger, a rear bottom auger, a grain outlet cylinder, a grain outlet auger, and a first driving device. The rear bottom auger and the front bottom auger are horizontally and vertically staggered with respect to a first set axis and are arranged in the grain tank; the bottom of the grain outlet cylinder is located at one end where the front bottom auger and the rear bottom auger face each other. A first grain inlet is provided on the side wall of the corresponding end of the grain outlet cylinder with respect to the bottom of the front bottom auger, and a second grain inlet is provided on the side wall of the corresponding end of the grain outlet cylinder with respect to the bottom of the rear bottom auger. The grain outlet auger is arranged in the grain outlet cylinder, and the height of the bottom of the grain outlet auger does not exceed the height of the first grain inlet; the first driving device drives the front bottom auger, the rear bottom auger, and the grain outlet auger to rotate respectively.

[0005] In a possible implementation, the front bottom auger includes a first auger shaft and a first auger blade. The first auger shaft is horizontally arranged in the grain tank and is rotatably connected to the grain tank at both ends respectively. The first auger blade is spirally arranged on the outer peripheral side wall of the first auger shaft.

[0006] In a possible implementation, the rear bottom auger includes a second auger shaft and a second auger blade. The second auger shaft is vertically staggered with the first auger shaft. The second auger shaft is horizontally arranged in the grain tank with respect to the first auger shaft, and both ends of the second auger shaft are rotatably connected to the grain tank respectively. The second auger blade is spirally arranged on the outer peripheral side wall of the second auger shaft.

[0007] In a possible embodiment, the grain discharge auger includes a third auger shaft and a third auger blade, the bottom end of the third auger shaft is rotatably connected to the side wall of the grain discharge barrel, and the third auger blade is spirally arranged on the third auger shaft; the height of the bottom end of the third auger blade does not exceed the first grain inlet.

[0008] In a possible embodiment, the grain unloading system also includes a first transmission assembly, a second transmission assembly, a third transmission assembly and a clutch assembly; the first auger shaft is connected to the opposite end of the second auger shaft via the first transmission assembly, the clutch of the clutch assembly is connected to the third auger shaft via the second transmission assembly, and the first drive device is connected to the bottom end of the third auger shaft via the third transmission assembly; the clutch assembly also includes a clutch controller, the clutch is coaxially arranged with the first auger shaft, and the clutch controller is used to control the connection or disconnection of the clutch with the first auger shaft.

[0009] In a possible embodiment, the first transmission assembly includes a first sprocket, a second sprocket and a first chain, the first sprocket and the second sprocket are respectively arranged at the opposite ends of the first auger shaft and the second auger shaft, and the first sprocket and the second sprocket are connected by the first chain.

[0010] In a possible embodiment, the second transmission assembly includes a third sprocket, a fourth sprocket, a second chain and a gear box, the gear box includes a first rotating shaft and a second rotating shaft axially perpendicular to each other; the bottom end of the third auger shaft is connected to the first rotating shaft of the gear box, the third sprocket is sleeved on the second rotating shaft of the gear box, the fourth sprocket is arranged on the clutch, and the third sprocket is connected to the fourth sprocket via the second chain.

[0011] In a possible embodiment, the third transmission assembly includes a fifth sprocket, a sixth sprocket and a third chain, and the first driving device includes a driving shaft; the fifth sprocket and the third sprocket are coaxially arranged on the second rotating shaft, the sixth sprocket is arranged on the driving shaft, and the fifth sprocket and the sixth sprocket are connected via the third chain.

[0012] In a possible implementation, the grain bin includes a first bottom plate, a second bottom plate, an inclined plate, a first diversion plate, and a second diversion plate; the second bottom plate is arranged vertically offset from the first bottom plate and connected by the inclined plate. The heights of the front bottom auger and the first grain inlet respectively match the height of the first bottom plate, and the heights of the rear bottom auger and the second grain inlet respectively match the height of the second bottom plate; the bottom end of the first diversion plate is inclined downward relative to the front bottom auger, and the bottom end of the second diversion plate is inclined downward relative to the rear bottom auger.

[0013] In a possible implementation, the grain bin further includes a top cover assembly, a top cover drive assembly, a first side plate, and a second side plate. The first side plate, the first diversion plate, the second side plate, and the second diversion plate are arranged adjacent to each other in sequence and connected.

[0014] The top cover assembly includes a first top cover, a second top cover, a third top cover, and a fourth top cover. The first top cover is arranged above the first side plate and rotatably connected to the first side plate. The first top cover, the second top cover, the third top cover, and the fourth top cover are respectively arranged above the first side plate, the first diversion plate, the second side plate, and the second diversion plate according to the arrangement sequence of the first side plate, the first diversion plate, the second side plate, and the second diversion plate; the bottom of the first top cover is rotatably connected to the top of the first side plate, the bottom of the second top cover is rotatably connected to the top of the first diversion plate, the bottom of the third top cover is rotatably connected to the top of the second side plate, and the bottom of the fourth top cover is rotatably connected to the top of the second diversion plate.

[0015] The top cover drive assembly includes a first rotating arm, a second rotating arm, a third rotating arm, a fourth rotating arm, and a second driving device. The first rotating arm is arranged inside the first top cover and connected to the first top cover. The second rotating arm is arranged inside the second top cover and connected to the second top cover. The third rotating arm is arranged inside the third top cover and connected to the third top cover. The fourth rotating arm is arranged inside the fourth top cover and connected to the fourth top cover.

[0016] In the embodiment of the present application, the rear bottom auger and the front bottom auger are arranged vertically offset, and the installation height of the front bottom auger is lower than that of the rear bottom auger, which can enable the front bottom auger to stir the stored grain relatively lower in the grain bin, and the rear bottom auger to stir the stored grain relatively higher in the grain bin, so as to realize the layered stirring of the stored grain in the grain bin, and improve the unloading efficiency by improving the stirring efficiency.

[0017] To make the above objects, features, and advantages of the present application more obvious and understandable, the following specifically enumerates preferred embodiments and, in conjunction with the accompanying drawings, makes a detailed description as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] To more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the accompanying drawings required for the embodiments. It should be understood that the following drawings only show certain embodiments of the present application, and thus should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0019] Figure 1 It shows a side sectional view of a grain unloading system of a harvester with a double-bottom auger for grain unloading provided by an embodiment of the present application.

[0020] Figure 2 It shows an overall structure diagram of a grain unloading system of a harvester with a double-bottom auger for grain unloading from a lateral perspective provided by an embodiment of the present application.

[0021] Figure 3 It shows an overall structure diagram of a grain unloading system of a harvester with a double-bottom auger for grain unloading from a top-down perspective provided by an embodiment of the present application.

[0022] Figure 4 It shows a transmission system diagram of a grain unloading system of a harvester with a double-bottom auger for grain unloading provided by an embodiment of the present application.

[0023] Figure 5 It shows a structure diagram of a grain tank in a grain unloading system of a harvester with a double-bottom auger for grain unloading provided by an embodiment of the present application.

[0024] Wherein: 1. Grain tank; 11. First bottom plate; 12. Second bottom plate; 13. Inclined plate; 14. First deflector; 15. Second deflector; 16. First side plate; 17. Second side plate; 18. First top cover; 19. Second top cover; 110. Third top cover; 111. Fourth top cover; 112. First rotating arm; 113. Second rotating arm; 114. Third rotating arm; 115. Fourth rotating arm; 116. Right rotating shaft; 117. Front rotating shaft; 118. Left rotating shaft; 119. Rear rotating shaft; 120. Oil cylinder; 121. Angular seal; 122. Front and rear seal; 123. Tie rod;

[0025] 2. Front bottom auger; 21. First auger shaft; 22. First auger blade;

[0026] 3. Rear bottom auger; 31. Second auger shaft; 32. Second auger blade;

[0027] 4. Grain outlet tube; 41. First grain inlet; 42. Second grain inlet;

[0028] 5. Outlet auger; 51. Third auger shaft; 52. Third auger blade;

[0029] 6. Clutch;

[0030] 71. First sprocket; 72. Second sprocket; 73. Third sprocket; 74. Fourth sprocket; 75. Fifth sprocket; 76. Sixth sprocket; 77. Gearbox; 78. Chain; 79. Intermediate sprocket;

[0031] 8. Intermediate shaft. Detailed implementation manner

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Usually, the components of the embodiments of the present application described and illustrated herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the present application claimed, but only represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present application.

[0033] As Figure 1 , Figure 2 and Figure 3 shown, a grain unloading system of a harvester with a double-bottom auger for grain unloading is used for unloading the grain bin 1 of the harvester. The grain unloading system includes: a front bottom auger 2, a rear bottom auger 3, a grain outlet tube 4, a grain outlet auger 5, and a first driving device. The rear bottom auger 3 and the front bottom auger 2 are horizontally arranged and vertically offset relative to a first set axis in the grain bin 1; the bottom of the grain outlet tube 4 is located at one end where the front bottom auger 2 and the rear bottom auger 3 face each other. A first grain inlet 41 is provided on the side wall of the corresponding end of the grain outlet tube 4 relative to the bottom of the front bottom auger 2, and a second grain inlet 42 is provided on the side wall of the corresponding end of the grain outlet tube 4 relative to the bottom of the rear bottom auger 3. The grain outlet auger 5 is arranged in the grain outlet tube 4, and the height of the bottom of the grain outlet auger 5 does not exceed the height of the first grain inlet 41; the first driving device drives the front bottom auger 2, the rear bottom auger 3, and the grain outlet auger 5 to rotate respectively.

[0034] Combined with the above embodiments, the rear bottom auger 3 and the front bottom auger 2 are horizontally arranged relative to the first set axis. The first set axis can be along the length direction or the width direction of the grain bin 1 of the harvester. The specific setting direction can be set according to the specific shape or size of the grain bin 1. However, no matter whether the rear bottom auger 3 and the front bottom auger 2 are arranged along the length direction or the width direction of the grain bin 1, it is necessary to make the rear bottom auger 3 and the front bottom auger 2 fully stir the stored grain (such as grains like wheat, corn, and soybeans) inside the grain bin 1 as much as possible to avoid dead corner positions that cannot be stirred.

[0035] In addition, the rear bottom auger 3 and the front bottom auger 2 are arranged offset up and down, and the installation height of the front bottom auger 2 is lower than that of the rear bottom auger 3, which enables the front bottom auger 2 to agitate the stored grain closer to the lower part in the grain box 1, and the rear bottom auger 3 to agitate the stored grain closer to the upper part in the grain box 1, thereby realizing the layered agitation of the stored grain in the grain box 1 and improving the unloading efficiency by increasing the agitation efficiency.

[0036] Furthermore, the stored grain agitated by the front bottom auger 2 enters the grain outlet tube 4 through the first grain inlet 41, and is lifted by the grain outlet auger 5 inside the grain outlet tube 4 and conveyed to the external storage location. Similarly, the stored grain agitated by the rear bottom auger 3 enters the grain outlet tube 4 through the second grain inlet 42, and is lifted by the grain outlet auger 5 inside the grain outlet tube 4 and conveyed to the external storage location. Since the installation height of the bottom of the grain outlet auger 5 is lower than that of the first grain inlet 41, all the stored grain input into the grain outlet tube 4 by the front bottom auger 2 through the first grain inlet 41 can be conveyed upward by the grain outlet auger 5, reducing the residual amount of the stored grain.

[0037] As Figures 1 to 4 shown, in the grain unloading system of the harvester with double-bottom augers according to the embodiment of the present application, the front bottom auger 2 includes a first auger shaft 21 and a first auger blade 22. The first auger shaft 21 is horizontally arranged in the grain box 1 and is rotatably connected to the grain box 1 at both ends respectively. The first auger blade 22 is spirally arranged on the outer peripheral side wall of the first auger shaft 21.

[0038] Furthermore, the rear bottom auger 3 includes a second auger shaft 31 and a second auger blade 32. The second auger shaft 31 is arranged offset up and down from the first auger shaft 21. The second auger shaft 31 is horizontally arranged in the grain box 1 relative to the first auger shaft 21, and both ends of the second auger shaft 31 are rotatably connected to the grain box 1 respectively. The second auger blade 32 is spirally arranged on the outer peripheral side wall of the second auger shaft 31.

[0039] Furthermore, the grain outlet auger 5 includes a third auger shaft 51 and a third auger blade 52. The bottom end of the third auger shaft 51 is rotatably connected to the side wall of the grain outlet tube 4. The third auger blade 52 is spirally arranged on the third auger shaft 51; the height of the bottom end of the third auger blade 52 does not exceed that of the first grain inlet 41.

[0040] Combined with the above embodiments, the first auger shaft 21 and the second auger are horizontally arranged respectively and are arranged as close as possible to the bottom of the grain box 1, which can reduce the residual amount of the unloaded grain. The grain outlet tube 4 is arranged vertically or obliquely. Correspondingly, the third auger shaft 51 is arranged vertically or obliquely.

[0041] As Figure 4As shown, the grain unloading system of the harvester with double-bottom auger unloading in the embodiment of the present application, the grain unloading system also includes a first transmission assembly, a second transmission assembly, a third transmission assembly and a clutch 6 assembly; the first auger shaft 21 is transmission-connected with the opposite end of the second auger shaft 31 via the first transmission assembly, the clutch 6 of the clutch 6 assembly is transmission-connected with the third auger shaft 51 via the second transmission assembly, and the first drive device is transmission-connected with the bottom end of the third auger shaft 51 via the third transmission assembly; the clutch 6 assembly also includes a clutch controller, the clutch 6 is coaxially arranged with the first auger shaft 21, and the clutch controller is used to control the connection or disconnection of the clutch 6 with the first auger shaft 21.

[0042] In combination with the above-mentioned embodiment, the driving device can drive the grain-discharging auger 5, and the grain-discharging auger 5 then drives the clutch 6 to rotate. When the clutch controller controls the clutch 6 to connect with the first auger shaft 21, the clutch 6 can drive the first auger shaft 21 to rotate, that is, the front bottom auger 2 rotates, and the front bottom auger 2 then drives the rear bottom auger 3 to rotate. When the clutch controller controls the clutch 6 to disconnect from the first auger shaft 21, the front bottom auger 2 and the rear bottom auger 3 lose their power source and stop rotating, realizing multi-stage clutch of the auger, thereby realizing segmented grain unloading during the operation. Preferably, the clutch 6 can be an electromagnetic clutch 6, and the connection or disconnection of the clutch 6 and the front bottom auger 2 can be remotely controlled.

[0043] The double-bottomed auger unloading system of the harvester of the embodiment of the present application, the first transmission assembly includes a first sprocket 71, a second sprocket 72 and a first chain, the first sprocket 71 and the second sprocket 72 are respectively arranged at the opposite ends of the first auger shaft 21 and the second auger shaft 31, and the first sprocket 71 and the second sprocket 72 are connected by the first chain.

[0044] The double-bottomed auger unloading grain harvester grain unloading system of the embodiment of the present application, the second transmission assembly includes a third sprocket 73, a fourth sprocket 74, a second chain and a gear box 77, the gear box 77 includes a first rotating shaft and a second rotating shaft that are axially perpendicular to each other; the bottom end of the third auger shaft 51 is connected to the first rotating shaft of the gear box 77, the third sprocket 73 is mounted on the second rotating shaft of the gear box 77, the fourth sprocket 74 is arranged on the clutch 6, and the third sprocket 73 and the fourth sprocket 74 are connected by a second chain.

[0045] In the grain unloading system of the harvester with double-bottom auger unloading in the embodiment of the present application, the third transmission assembly includes a fifth sprocket 75, a sixth sprocket 76 and a third chain, and the first drive device includes a drive shaft; the fifth sprocket 75 is coaxially arranged on the second rotating shaft with the third sprocket 73, the sixth sprocket 76 is arranged on the drive shaft, and the fifth sprocket 75 and the sixth sprocket 76 are connected by the third chain.

[0046] Further, an intermediate shaft 8 is also provided between the drive shaft and the second rotating shaft of the gearbox 77. The axial directions of the drive shaft, the second rotating shaft, and the intermediate shaft 8 are parallel to each other and horizontally arranged. An intermediate sprocket 79 is provided on the intermediate shaft 8. The sixth sprocket 76 on the drive shaft, the intermediate sprocket 79 on the intermediate shaft 8, and the second rotating shaft on the gearbox 77 are sequentially connected by a chain 78. In addition, the drive shaft, the intermediate shaft 8, and the second rotating shaft are arranged in a triangular shape, so that the intermediate shaft 8 plays a role in tensioning.

[0047] In the grain unloading system of the harvester with double-bottom augers for unloading grain according to the embodiment of the present application, the grain tank 1 includes a first bottom plate 11, a second bottom plate 12, an inclined plate 13, a first guiding plate 14, and a second guiding plate 15; the second bottom plate 12 is arranged offset up and down from the first bottom plate 11 and connected by the inclined plate 13. The heights of the front bottom auger 2 and the first grain inlet 41 respectively match the height of the first bottom plate 11, and the heights of the rear bottom auger 3 and the second grain inlet 42 respectively match the height of the second bottom plate 12; the bottom end of the first guiding plate 14 is inclined downward relative to the front bottom auger 2, and the bottom end of the second guiding plate 15 is inclined downward relative to the rear bottom auger 3.

[0048] Combined with the above embodiments, the downward-inclined setting of the first guiding plate 14 and the second guiding plate 15 enables the stored grain to flow downward into the front bottom auger 2 and the rear bottom auger 3, and the bottom of the grain tank 1 is set in a stepped shape with a height difference, so that the front bottom auger 2 and the rear bottom auger 3 agitate the stored grain at different heights.

[0049] As Figure 5 shown, in the grain unloading system of the harvester with double-bottom augers for unloading grain according to the embodiment of the present application, the grain tank 1 further includes a top cover assembly, a top cover drive assembly, a first side plate 16, and a second side plate 17. The first side plate 16, the first guiding plate 14, the second side plate 17, and the second guiding plate 15 are sequentially adjacent and connected.

[0050] Further, the top cover assembly includes a first top cover 18, a second top cover 19, a third top cover 110, and a fourth top cover 111. The first top cover 18 is arranged above the first side plate 16 and rotatably connected to the first side plate 16. The first top cover 18, the second top cover 19, the third top cover 110, and the fourth top cover 111 are respectively arranged above the first side plate 16, the first guiding plate 14, the second side plate 17, and the second guiding plate 15 in the setting order relative to the first side plate 16, the first guiding plate 14, the second side plate 17, and the second guiding plate 15; the bottom of the first top cover 18 is rotatably connected to the top of the first side plate 16, the bottom of the second top cover 19 is rotatably connected to the top of the first guiding plate 14, the bottom of the third top cover 110 is rotatably connected to the top of the second side plate 17, and the bottom of the fourth top cover 111 is rotatably connected to the top of the second guiding plate 15.

[0051] Further, the top cover driving assembly includes a first swing arm 112, a second swing arm 113, a third swing arm 114, a fourth swing arm 115 and a second driving device. The first swing arm 112 is disposed inside the first top cover 18 and connected to the first top cover 18. The second swing arm 113 is disposed inside the second top cover 19 and connected to the second top cover 19. The third swing arm 114 is disposed inside the third top cover 110 and connected to the third top cover 110. The fourth swing arm 115 is disposed inside the fourth top cover 111 and connected to the fourth top cover 111.

[0052] Combined with the above embodiments, the top of the granary adopts a heightened design, and the first top cover 18, the second top cover 19, the third top cover 110 and the fourth top cover 111 can be automatically opened or closed through the corresponding first swing arm 112, second swing arm 113, third swing arm 114 and fourth swing arm 115 respectively. While increasing the grain storage volume, it can also realize the automatic opening or closing of the top of the granary, reducing the operation intensity.

[0053] In addition, the right rotating shaft 116, the front rotating shaft 117, the left rotating shaft 118 and the rear rotating shaft 119 disposed inside the grain box 1 are respectively connected to the first swing arm 112, the second swing arm 113, the third swing arm 114 and the fourth swing arm 115. Through the cooperation of the oil cylinder 120 and the pull rod 123, by driving the right rotating shaft 116, the front rotating shaft 117, the left rotating shaft 118 and the rear rotating shaft 119 to rotate, thereby driving the corresponding first swing arm 112, second swing arm 113, third swing arm 114 and fourth swing arm 115 to swing, and finally realizing the outward opening or inward closing of the first top cover 18, the second top cover 19, the third top cover 110 and the fourth top cover 111.

[0054] In addition, the described embodiments are only a part of the embodiments of the present application, rather than all embodiments. Usually, the components of the embodiments of the present application described and illustrated in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the present application claimed, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present application.

Claims

1. A double-bottom auger unloading grain harvester grain unloading system, used for unloading grain from a grain box of the harvester, characterized in that: The grain unloading system includes: a front bottom auger, a rear bottom auger, a grain discharge barrel, a grain discharge auger, a first driving device and an electromagnetic clutch, the front bottom auger and the rear bottom auger are arranged oppositely in the grain box, and the bottom of the grain discharge barrel is located at the opposite end of the front bottom auger and the rear bottom auger; a first grain inlet is arranged on the side wall of the grain discharge barrel at the bottom of the corresponding end of the front bottom auger, and a second grain inlet is arranged on the side wall of the grain discharge barrel at the bottom of the corresponding end of the rear bottom auger, the grain discharge auger is arranged in the grain discharge barrel, and the height of the bottom of the grain discharge auger does not exceed the height of the first grain inlet and the second grain inlet; The rear bottom auger and the front bottom auger are arranged horizontally relative to the first set axis and staggered up and down in the grain box; the bottom of the grain discharge barrel is located at the end opposite to the front bottom auger and the rear bottom auger; the first driving device drives the front bottom auger, the rear bottom auger and the grain discharge auger to rotate respectively.

2. The double-bottom auger grain unloading harvester grain unloading system according to claim 1 is characterized in that: The front bottom auger includes a first auger shaft and a first auger blade. The first auger shaft is horizontally arranged in the grain box and both ends are rotatably connected to the grain box respectively. The first auger blade is spirally arranged on the outer peripheral side wall of the first auger shaft.

3. The double-bottom auger grain unloading harvester grain unloading system according to claim 2 is characterized in that: The rear bottom auger includes a second auger shaft and a second auger blade. The second auger shaft and the first auger shaft are staggered up and down. The second auger shaft is horizontally arranged in the grain box relative to the first auger shaft, and the two ends of the second auger shaft are respectively rotatably connected to the grain box. The second auger blade is spirally arranged on the outer peripheral side wall of the second auger shaft.

4. The double-bottom auger grain unloading harvester grain unloading system according to claim 3 is characterized in that: The grain discharge auger includes a third auger shaft and a third auger blade. The bottom end of the third auger shaft is rotatably connected to the side wall of the grain discharge barrel. The third auger blade is spirally arranged on the third auger shaft. The height of the bottom end of the third auger blade does not exceed the first grain inlet.

5. The double-bottom auger grain unloading harvester grain unloading system according to claim 4, characterized in that: The grain unloading system also includes a first transmission assembly, a second transmission assembly, a third transmission assembly and a clutch assembly; the first auger shaft is connected to the opposite end of the second auger shaft via the first transmission assembly, the clutch of the clutch assembly is connected to the third auger shaft via the second transmission assembly, and the first drive device is connected to the bottom end of the third auger shaft via the third transmission assembly; the clutch assembly also includes a clutch controller, the clutch is coaxially arranged with the first auger shaft, and the clutch controller is used to control the connection or disconnection of the clutch with the first auger shaft.

6. The double-bottom auger grain unloading harvester grain unloading system according to claim 5, characterized in that: The first transmission assembly includes a first sprocket, a second sprocket and a first chain. The first sprocket and the second sprocket are respectively arranged at the opposite ends of the first auger shaft and the second auger shaft, and the first sprocket and the second sprocket are connected through the first chain.

7. The double-bottom auger grain unloading harvester grain unloading system according to claim 5, characterized in that: The second transmission assembly includes a third sprocket, a fourth sprocket, a second chain and a gear box, and the gear box includes a first rotating shaft and a second rotating shaft that are axially perpendicular to each other; the bottom end of the third auger shaft is connected to the first rotating shaft of the gear box, the third sprocket is sleeved on the second rotating shaft of the gear box, the fourth sprocket is arranged on the clutch, and the third sprocket is connected to the fourth sprocket via the second chain.

8. The double-bottom auger grain unloading system for harvesters according to claim 7, characterized in that: The third transmission assembly includes a fifth sprocket, a sixth sprocket and a third chain, and the first driving device includes a driving shaft; the fifth sprocket and the third sprocket are coaxially arranged on the second rotating shaft, the sixth sprocket is arranged on the driving shaft, and the fifth sprocket and the sixth sprocket are connected by the third chain.

9. The double-bottom auger grain unloading harvester grain unloading system according to any one of claims 1 to 8, characterized in that: The grain box includes a first bottom plate, a second bottom plate, an inclined plate, a first guide plate and a second guide plate; the second bottom plate and the first bottom plate are staggered up and down and connected by the inclined plate, the height of the front bottom auger and the first grain inlet respectively match the height of the first bottom plate, and the height of the rear bottom auger and the second grain inlet respectively match the height of the second bottom plate; the bottom end of the first guide plate is tilted downward relative to the front bottom auger, and the bottom end of the second guide plate is tilted downward relative to the rear bottom auger.

10. The double-bottom auger grain unloading system for harvesters according to claim 9, characterized in that: The grain tank further comprises a top cover assembly, a top cover driving assembly, a first side plate and a second side plate, wherein the first side plate, the first guide plate, the second side plate and the second guide plate are arranged adjacent to and connected in sequence; The top cover assembly includes a first top cover, a second top cover, a third top cover and a fourth top cover, the first top cover is arranged above the first side plate and is rotatably connected to the first side plate, the first top cover, the second top cover, the third top cover and the fourth top cover are arranged above the first side plate, the first guide plate, the second side plate and the second guide plate in the order of the first side plate, the first guide plate, the second side plate and the second guide plate respectively; the bottom of the first top cover is rotatably connected to the top of the first side plate, the bottom of the second top cover is rotatably connected to the top of the first guide plate, the bottom of the third top cover is rotatably connected to the top of the second side plate, and the bottom of the fourth top cover is rotatably connected to the top of the second guide plate; The top cover driving assembly includes a first rotating arm, a second rotating arm, a third rotating arm, a fourth rotating arm and a second driving device. The first rotating arm is arranged on the inner side of the first top cover and connected to the first top cover, the second rotating arm is arranged on the inner side of the second top cover and connected to the second top cover, the third rotating arm is arranged on the inner side of the third top cover and connected to the third top cover, and the fourth rotating arm is arranged on the inner side of the fourth top cover and connected to the fourth top cover.

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