Grain tank assembly and harvester

Abstract

The utility model relates to the field of agricultural machinery, and discloses a grain tank assembly and a harvester, and the grain tank assembly comprises a grain tank which comprises a main tank body with a top opening and an expansion structure which is connected to the opening edge of the top opening in an openable and closable manner; the lifting and transporting system comprises a primary lifting and transporting device and a secondary lifting and transporting device, the primary lifting and transporting device extends into the main box body, and the secondary lifting and transporting device can be arranged in the grain box in an up-down landing mode and can be connected with or separated from the primary lifting and transporting device; and the driving system comprises a transmission rotating shaft rotatably arranged in the main box body, an opening and closing transmission mechanism connected between the transmission rotating shaft and the expansion structure, a lifting transmission mechanism connected between the transmission rotating shaft and the secondary elevator, and a power device for driving the transmission rotating shaft to rotate. According to the grain tank assembly, the requirement for increasing the volume of the grain tank and the requirements for maneuverability, flexibility and long-distance transfer convenience of the harvester can be effectively met, and therefore the adaptability under different working conditions can be improved.

Description

Technical Field

[0001] This application belongs to the technical field of agricultural machinery, and specifically relates to a grain tank assembly and a harvester. Background Art

[0002] In order to improve agricultural production efficiency and adapt to large-scale agricultural production, the feeding volume of harvesters is increasing year by year. As a temporary storage container, the grain tank of the harvester should also be correspondingly enlarged to reduce the number and time of grain unloading, which helps the harvester to operate continuously in the field, improve the harvesting efficiency, and reduce the interruption of operation due to the full load of the grain tank. However, simply enlarging the traditional grain tank will increase the overall size of the harvester, which is not conducive to the mobility and flexibility of the harvester, and is not conducive to the long-distance transfer of the harvester using transportation tools. Summary of the Utility Model

[0003] The purpose of this application is to provide a grain tank assembly and a harvester, which can effectively balance the need for increasing the grain tank volume and the requirements for the mobility, flexibility, and convenience of long-distance transfer of the harvester, and improve the adaptability of the grain tank assembly under different working conditions.

[0004] To achieve the above purpose, on the one hand, this application provides a grain tank assembly, which includes:

[0005] A grain tank, including a main box body with an open top and an expansion structure that is detachably connected to the edge of the open top;

[0006] A lifting system, including a primary elevator and a secondary elevator. The primary elevator extends into the main box body, and the secondary elevator is vertically movable in the grain tank and can be connected or separated from the primary elevator; and

[0007] A drive system, including a transmission rotating shaft rotatably arranged in the main box body, an opening and closing transmission mechanism connected between the transmission rotating shaft and the expansion structure, a lifting and lowering transmission mechanism connected between the transmission rotating shaft and the secondary elevator, and a power device for driving the transmission rotating shaft to rotate.

[0008] In some embodiments, in the open state of the expansion structure, the secondary elevator is connected to the primary elevator, and the output end of the secondary elevator extends into the expansion cavity of the expansion structure; in the closed state of the expansion structure, the secondary elevator is separated from the primary elevator, and the secondary elevator is retracted into the main box body.

[0009] In some embodiments, the primary elevator includes a primary elevator output shaft and a first bushing fixed to an end of the primary elevator output shaft. The secondary elevator includes a secondary elevator auger and a second bushing fixed to an input end of the secondary elevator auger. The first bushing is provided with a first beveled end face, and the second bushing is provided with a second beveled end face that can be joined or separated from the first beveled end face. The primary elevator output shaft and the secondary elevator auger can be fixed to each other through the mutually joined first bushing and second bushing.

[0010] In some embodiments, the secondary elevator is arranged to be swingable up and down. The lifting and lowering transmission mechanism includes a hanging arm connected to the transmission rotating shaft and a towing cable connected between the hanging arm and the secondary elevator.

[0011] Wherein, during the rotation of the transmission rotating shaft, the hanging arm that moves along with the transmission rotating shaft can drive the secondary elevator to swing through the towing cable so that the secondary elevator can be joined or separated from the primary elevator.

[0012] In some embodiments, in the closed state of the expansion structure, the towing cable is in a slack state so that when the expansion structure is opened, the secondary elevator can move behind the expansion structure.

[0013] In some embodiments, the expansion structure includes a flip cover plate that is connected to the rim of the top opening in a flip-up and -down manner. The opening and closing transmission mechanism includes a support rod and a pull rod. The support rod is connected to the transmission rotating shaft, and both ends of the pull rod are respectively ball-jointed to the support rod and the flip cover plate.

[0014] Wherein, during the rotation of the transmission rotating shaft, the support rod that moves along with the transmission rotating shaft can drive the flip cover plate to flip through the pull rod.

[0015] In some embodiments, the expansion structure includes two flip cover plates and two curtain fabrics that are alternately arranged around the top opening in sequence and can jointly enclose an expansion cavity. The two flip cover plates are arranged in a double - door manner and can drive the two curtain fabrics to open or close during the flip - opening and - closing process.

[0016] In some embodiments, in the open state of the curtain fabric, the bottom end of the curtain fabric is not higher than the top opening.

[0017] In some embodiments, the power device includes a telescopic mechanism and a swing arm. Both ends of the telescopic mechanism are respectively hinged to the main box body and the swing arm. The transmission rotating shaft is fixedly connected through the swing arm. The telescopic mechanism can drive the swing arm to swing during the telescopic process to drive the transmission rotating shaft to rotate.

[0018] The second aspect of the present application further provides a harvester, which includes the above-mentioned grain tank assembly.

[0019] Through the above technical solution, when the grain tank assembly of the present application needs to increase the volume of the grain tank, the driving device can be used to drive the transmission rotating shaft to rotate. The rotating transmission rotating shaft can drive the opening and closing transmission mechanism to drive the expansion structure to open, so as to form an expansion cavity above the main box body and increase the volume of the grain tank. In addition, during the opening process of the expansion structure, the rotating transmission rotating shaft can also drive the lifting transmission mechanism to gradually lift the secondary elevator, and finally connect the secondary elevator with the primary elevator. Therefore, after the expansion structure is opened, the secondary elevator can be used to realize the turning and re-lifting of the grain, and convey the grain to a higher place within a limited space.

[0020] When the expansion cavity is not required, the driving device can be used to drive the transmission rotating shaft to rotate in the reverse direction. The reversely rotating transmission rotating shaft can drive the lifting transmission mechanism to gradually lower the lifted secondary elevator, and the lowered secondary elevator will be separated from the primary elevator. In addition, the reversely rotating transmission rotating shaft can also drive the opening and closing transmission mechanism to drive the expansion structure to close.

[0021] It can be seen that the grain tank assembly can adjust its own volume according to the grain storage requirement, so as to better adapt to different crops or harvesting conditions. After the expansion structure is closed, the overall size of the grain tank assembly is reduced, so that the overall size of the harvester can also be reduced, effectively ensuring the mobility and flexibility of the harvester, facilitating the harvester to pass through narrow roads or farmlands, enabling it to reach the operation site faster and improving the operation efficiency. Moreover, the reduction of the overall size of the grain tank assembly also facilitates disassembly, assembly and long-distance transportation, thereby improving the adaptability of the grain tank assembly under different working conditions.

[0022] Other features and advantages of the embodiments of the present application will be described in detail in the subsequent specific embodiment part. Brief Description of the Drawings

[0023] The drawings are used to provide a further understanding of the embodiments of the present application, and constitute a part of the specification. They are used to explain the embodiments of the present application together with the following specific embodiments, but do not constitute a limitation to the embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on the structures shown in these drawings without creative efforts. In the drawings:

[0024] Figure 1 is a schematic diagram of a grain tank assembly in a specific embodiment of the present application;

[0025] Figure 2 is Figure 1 a schematic diagram of the grain tank assembly in another perspective in

[0026] Figure 3 is Figure 1 a partial schematic view of the first elevator and the second elevator in

[0027] Figure 4 is Figure 1 a schematic view of the expansion structure, the transmission rotating shaft, the opening and closing transmission mechanism, and the lifting and lowering transmission mechanism in

[0028] Description of the reference numerals

[0029] 1 Main box body 2 Expansion structure

[0030] 3 Fixed frame 4 First elevator

[0031] 5 Second elevator 6 Transmission rotating shaft

[0032] 7 Power device 8 Swing arm

[0033] 9 Hanging arm 10 Towing cable

[0034] 11 Support rod 12 Pull rod

[0035] 13 Lifting and lowering rotating shaft

[0036] 21 Tipping cover plate 22 Curtain

[0037] 23 Curtain hanging cable 41 First elevator output shaft

[0038] 42 First bushing 43 Grain box

[0039] 44 Grain box mounting seat 45 Bevel gear box

[0040] 51 Second elevator auger 52 Second bushing Detailed implementation manners

[0041] The following describes the detailed implementation manners of the present application with reference to the accompanying drawings. It should be understood that the detailed implementation manners described herein are only used to illustrate and explain the present application and are not used to limit the present application.

[0042] Referring to Figures 1 to 4 , the first exemplary embodiment of the present application provides a grain box assembly, which includes:

[0043] A grain box, including a main box body 1 with an open top and an expansion structure 2 that is openably and closably connected to the edge of the open top;

[0044] A lifting system, including a first elevator 4 and a second elevator 5. The first elevator 4 extends into the main box body 1, and the second elevator 5 is vertically movable up and down in the grain box and can be connected or separated from the first elevator 4; and

[0045] The driving system includes a transmission rotating shaft 6 rotatably arranged in the main box body 1 (for example, the transmission rotating shaft 6 is rotatably connected to the fixed frame 3), an opening and closing transmission mechanism connected between the transmission rotating shaft 6 and the expansion structure 2, a lifting transmission mechanism connected between the transmission rotating shaft 6 and the secondary elevator 5, and a power device 7 for driving the transmission rotating shaft 6 to rotate.

[0046] With the above arrangement, when the grain box assembly of the present application needs to increase the grain box volume, the power device 7 can be used to drive the transmission rotating shaft 6 to rotate. The rotating transmission rotating shaft 6 can drive the opening and closing transmission mechanism to drive the expansion structure 2 to open, so as to form an expansion cavity above the main box body 1 and increase the grain box volume. In addition, during the opening process of the expansion structure 2, the rotating transmission rotating shaft 6 can also drive the lifting transmission mechanism to gradually lift the secondary elevator 5, and finally connect the secondary elevator 5 with the primary elevator 4. Therefore, after the expansion structure 2 is opened, the secondary elevator 5 can be used to realize the turning and re-lifting of the grain, and the grain can be conveyed to a higher place in a limited space.

[0047] When the expansion cavity is not required, the power device 7 can be used to drive the transmission rotating shaft 6 to rotate in the reverse direction. The reversely rotating transmission rotating shaft 6 can drive the lifting transmission mechanism to gradually lower the lifted secondary elevator 5, and the lowered secondary elevator 5 will be separated from the primary elevator 4. In addition, the reversely rotating transmission rotating shaft 6 can also drive the opening and closing transmission mechanism to drive the expansion structure 2 to close.

[0048] It can be seen that the grain box assembly can adjust its own volume according to the grain storage requirement, so as to better adapt to different crops or harvesting conditions. After the expansion structure 2 is closed, the overall size of the grain box assembly is reduced, so that the overall size of the harvester can also be reduced, which can effectively ensure the mobility and flexibility of the harvester, facilitate the harvester to pass through narrow roads or farmlands, enable it to reach the operation site faster, and improve the operation efficiency. Moreover, the reduction of the overall size of the grain box assembly is also conducive to disassembly, installation and long-distance transportation, thereby improving the adaptability of the grain box assembly under different working conditions.

[0049] In some embodiments, in the opened state of the expansion structure 2, the secondary elevator 5 is connected to the primary elevator 4, and the output end of the secondary elevator 5 extends into the expansion cavity of the expansion structure 2, which can ensure that the secondary elevator 5 can lift the grain into the expansion cavity. And since the output end of the secondary elevator 5 is higher than the top of the main box body 1, when the main box body 1 is full of grain, it can prevent the secondary elevator 5 from being difficult to lift the grain again and prevent the secondary elevator 5 from being blocked.

[0050] In the closed state of the expansion structure 2, the secondary elevator 5 is separated from the primary elevator 4, and the secondary elevator 5 is retracted into the main box body 1, so that the secondary elevator 5 does not protrude beyond the main box body 1. From the perspective of the outer shape of the grain box assembly, at this time, the top end of the main box body 1 is the top end of the grain box assembly. Therefore, after the expansion structure 2 is closed, the overall size of the grain box assembly can be minimized to the greatest extent, and in some working conditions, it can be ensured that the expansion structure 2 can seal the top opening of the main box body 1 in the closed state, and the top opening will not fail to be sealed due to the secondary elevator 5 not being completely retracted into the main box body 1.

[0051] In some embodiments, the primary elevator 4 includes a primary elevator output shaft 41 and a first shaft sleeve 42 fixed to the end of the primary elevator output shaft 41, and the secondary elevator 5 includes a secondary elevator auger 51 and a second shaft sleeve 52 fixed to the input end of the secondary elevator auger 51. Among them, the first shaft sleeve 42 is provided with a first beveled end face, and the second shaft sleeve 52 is provided with a second beveled end face that can be joined or separated from the first beveled end face, and the primary elevator output shaft 41 and the secondary elevator auger 51 can be fixed to each other through the mutually joined first shaft sleeve 42 and second shaft sleeve 52.

[0052] In other words, in this embodiment, when the secondary elevator 5 is joined to the primary elevator 4, the first beveled end face of the first shaft sleeve 42 is abutted against the second beveled end face of the second shaft sleeve 52. When the primary elevator output shaft 41 drives the first shaft sleeve 42 to rotate, due to the cooperation of the beveled end faces, the first shaft sleeve 42 can drive the second shaft sleeve 52 to rotate synchronously, so as to drive the secondary elevator auger 51 fixed to the second shaft sleeve 52 to rotate, and the grain is lifted again through the secondary elevator auger 51.

[0053] More specifically, the primary elevator 4 may further include a seed box 43, a seed box mounting seat 44 for mounting and fixing the seed box 43, and a bevel gear box 45 provided in the seed box 43. At this time, the primary elevator output shaft 41 is connected to the bevel gear in the bevel gear box 45. After the primary elevator 4 inputs grain from outside the grain box assembly, the grain can be lifted into the seed box 43. When the secondary elevator 5 is joined to the primary elevator 4, the grain in the seed box 43 can be conveyed to the secondary elevator 5 through the bevel gear box 45, and then the grain is lifted by the secondary elevator auger 51.

[0054] In addition, in this embodiment, when the secondary elevator 5 is separated from the primary elevator 4, the first beveled end face of the first shaft sleeve 42 is separated from the second beveled end face of the second shaft sleeve 52. Therefore, at this time, the primary elevator output shaft 41 cannot drive the secondary elevator auger 51 to rotate synchronously through the first shaft sleeve 42 and the second shaft sleeve 52.

[0055] In some embodiments, the secondary elevator 5 is arranged to be swingable up and down (for example, the secondary elevator 5 is rotatably connected to the grain bin mounting seat 44 through a lifting and lowering rotating shaft 13 to achieve swingability up and down). The lifting and lowering transmission mechanism may include a hanging arm 9 connected to the transmission rotating shaft 6 and a towing cable 10 connected between the hanging arm 9 and the secondary elevator 5. At this time, when the transmission rotating shaft 6 rotates, the hanging arm 9 that moves following the transmission rotating shaft 6 can drive the secondary elevator 5 to swing through the towing cable 10 so that the secondary elevator 5 is connected or separated from the primary elevator 4.

[0056] For example, referring to Figure 1 and Figure 4 , when the transmission rotating shaft 6 rotates clockwise, the hanging arm 9 swings upward, thereby towing the secondary elevator 5 to swing upward through the towing cable 10, so that the secondary elevator 5 is connected to the primary elevator 4. When the transmission rotating shaft 6 rotates counterclockwise, the hanging arm 9 swings downward, thereby driving the secondary elevator 5 to swing downward through the towing cable 10, so that the secondary elevator 5 is separated from the primary elevator 4.

[0057] The lifting and lowering transmission mechanism adopted in this embodiment only needs to set the hanging arm 9 and the towing cable 10 to realize the clutch switching between the secondary elevator 5 and the primary elevator 4. The structure is simple and reliable, which can effectively ensure the stability of the lifting and lowering transmission mechanism and save the production and manufacturing cost.

[0058] In some embodiments, in the closed state of the expansion structure 2, the towing cable 10 is in a relaxed state, so that when the expansion structure 2 is opened, the secondary elevator 5 can move behind the expansion structure 2, avoiding collision between the secondary elevator 5 and the expansion structure 2 when the secondary elevator 5 is lifted, thereby improving the reliability of the grain bin assembly when switching forms.

[0059] In some embodiments, the expansion structure 2 includes a flipping cover plate 21 that is connected to the rim of the top openable opening in a turnable manner up and down. The opening and closing transmission mechanism includes a support rod 11 and a pull rod 12. The support rod 11 is connected to the transmission rotating shaft 6. The two ends of the pull rod 12 are respectively in spherical hinge connection with the support rod 11 and the flipping cover plate 21 (for example, the two ends of the pull rod 12 are respectively in spherical hinge connection with the support rod 11 and the flipping cover plate 21 through spherical plain bearings). At this time, when the transmission rotating shaft 6 rotates, the support rod 11 that moves following the transmission rotating shaft 6 can drive the flipping cover plate 21 to flip through the pull rod 12, so as to open or close the expansion structure 2.

[0060] For example, referring to Figure 1 , when the transmission rotating shaft 6 rotates counterclockwise, the support rod 11 swings downward, thereby pulling the flipping cover plate 21 to turn downward through the pull rod 12, so that the expansion structure 2 is closed. When the transmission rotating shaft 6 rotates clockwise, the support rod 11 swings upward, thereby pushing the flipping cover plate 21 to turn upward through the pull rod 12, so that the expansion structure 2 is opened.

[0061] The opening and closing transmission mechanism adopted in this embodiment only needs to set the support rod 11 and the pull rod 12 to realize the opening and closing switching of the flip cover 21. The structure is simple and reliable, which can effectively ensure the stability of the opening and closing transmission mechanism and save the production and manufacturing costs.

[0062] In some embodiments, the expansion structure 2 includes two flip covers 21 and two curtain fabrics 22 that are alternately arranged around the top opening in sequence and can jointly enclose an expansion cavity. The two flip covers 21 are arranged in a double-leaf door manner. When the two flip covers 21 are turned up and opened, the two curtain fabrics 22 can be driven to open. When the two flip covers 21 are turned down and closed, the two curtain fabrics 22 can be driven to close.

[0063] More specifically, a curtain hanging cable 23 is connected between the two flip covers 21, and the top of the curtain fabric 22 is threaded through the curtain hanging cable 23. When the two flip covers 21 are turned up and opened, the curtain hanging cable 23 can be tightened, thereby driving the curtain fabric 22 to open. When the two flip covers 21 are turned down and closed, the curtain hanging cable 23 becomes loose, so that the curtain fabric 22 closes.

[0064] In some embodiments, in the opened state of the curtain fabric 22, the bottom end of the curtain fabric 22 is not higher than the top opening. With such a setting, it can effectively prevent the leakage of grain during the operation of the expansion structure 2 and improve the working reliability of the grain box assembly.

[0065] In some embodiments, the power device 7 includes a telescopic mechanism and a swing arm 8. The two ends of the telescopic mechanism are respectively hinged to the main box body 1 and the swing arm 8, and the transmission rotating shaft 6 is fixedly connected through the swing arm 8. The telescopic mechanism can drive the swing arm 8 to swing during the telescopic process to drive the transmission rotating shaft 6 to rotate. For example, the telescopic mechanism includes but is not limited to electric push rods, electro-hydraulic cylinders, electric cylinders, linear motors, etc. The operator can drive the telescopic mechanism to operate with one key in the cab of the harvester, so as to quickly switch the form of the grain box assembly, which is convenient and labor-saving.

[0066] The second exemplary embodiment of the present application also provides a harvester, which includes the above-mentioned grain box assembly.

[0067] In the description of the present application, it should be understood that the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0068] In this application, unless otherwise clearly specified and defined, the terms "installed", "connected", "coupled", "fixed", etc. shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, an electrical connection, or capable of communicating with each other; it can be directly connected, or indirectly connected through an intermediate medium, and can be the connection inside two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0069] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0070] Although the embodiments of this application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting this application. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of this application.

Claims

1. Grain box assembly, characterized in that, Comprising: A grain bin, including a main box body (1) with an open top and an expansion structure (2) connected to the rim of the open top in an openable and closable manner; A lifting system, including a primary elevator (4) and a secondary elevator (5), the primary elevator (4) extending into the main box body (1), and the secondary elevator (5) being vertically movable up and down in the grain bin and capable of being connected or separated from the primary elevator (4); and A drive system, including a transmission rotating shaft (6) rotatably arranged in the main box body (1), an opening and closing transmission mechanism connected between the transmission rotating shaft (6) and the expansion structure (2), a lifting and lowering transmission mechanism connected between the transmission rotating shaft (6) and the secondary elevator (5), and a power device (7) for driving the rotation of the transmission rotating shaft (6).

2. The grain bin assembly according to claim 1, characterized in that, In the open state of the expansion structure (2), the secondary elevator (5) is connected to the primary elevator (4), and the output end of the secondary elevator (5) extends into the expansion cavity of the expansion structure (2); in the closed state of the expansion structure (2), the secondary elevator (5) is separated from the primary elevator (4), and the secondary elevator (5) is received into the main box body (1).

3. The grain bin assembly according to claim 1, characterized in that, The primary elevator (4) includes a primary elevator output shaft (41) and a first shaft sleeve (42) fixed to the end of the primary elevator output shaft (41), the secondary elevator (5) includes a secondary elevator auger (51) and a second shaft sleeve (52) fixed to the input end of the secondary elevator auger (51), the first shaft sleeve (42) is provided with a first beveled end face, the second shaft sleeve (52) is provided with a second beveled end face capable of being connected or separated from the first beveled end face, and the primary elevator output shaft (41) and the secondary elevator auger (51) can be fixed to each other through the mutually connected first shaft sleeve (42) and second shaft sleeve (52).

4. The grain bin assembly according to claim 1, characterized in that, The secondary elevator (5) is arranged to be swingable up and down, and the lifting and lowering transmission mechanism includes a hanging arm (9) connected to the transmission rotating shaft (6) and a towing cable (10) connected between the hanging arm (9) and the secondary elevator (5); Wherein, during the rotation of the transmission rotating shaft (6), the hanging arm (9) moving with the transmission rotating shaft (6) can drive the secondary elevator (5) to swing through the towing cable (10) so that the secondary elevator (5) is connected or separated from the primary elevator (4).

5. The grain bin assembly according to claim 4, characterized in that In the closed state of the expansion structure (2), the towing cable (10) is in a slack state, so that the secondary elevator (5) can move behind the expansion structure (2) when the expansion structure (2) is opened.

6. The grain bin assembly according to claim 1, characterized in that, The expansion structure (2) includes a flip cover plate (21) connected to the rim of the open top in a turnable up and down manner, and the opening and closing transmission mechanism includes a support rod (11) and a pull rod (12), the support rod (11) is connected to the transmission rotating shaft (6), and both ends of the pull rod (12) are respectively in spherical hinge connection with the support rod (11) and the flip cover plate (21); Among them, during the rotation of the transmission rotating shaft (6), the support rod (11) that moves along with the transmission rotating shaft (6) can drive the flipping cover plate (21) to flip through the pull rod (12).

7. The grain bin assembly according to claim 1, characterized in that, The expansion structure (2) includes two flipping cover plates (21) and two curtain cloths (22) that are arranged alternately around the top opening and can jointly enclose an expansion cavity. The two flipping cover plates (21) are arranged in a double-leaf door manner and can drive the two curtain cloths (22) to open or close during the flipping and opening / closing process.

8. The grain bin assembly according to claim 7, characterized in that, In the open state of the curtain cloth (22), the bottom end of the curtain cloth (22) is not higher than the top opening.

9. The grain bin assembly according to any one of claims 1 to 8, characterized in that, The power device (7) includes a telescopic mechanism and a swing arm (8). The two ends of the telescopic mechanism are respectively hinged to the main box body (1) and the swing arm (8). The transmission rotating shaft (6) is fixedly connected through the swing arm (8). The telescopic mechanism can drive the swing arm (8) to swing during the telescopic process to drive the transmission rotating shaft (6) to rotate.

10. A harvester, characterized in that, It includes a grain box assembly according to any one of claims 1 to 9.

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