A reel mechanism, a cutter bar including the same, and a corn harvester

Abstract

The present invention relates to a straw-pulling mechanism and a harvesting platform and corn harvester containing the same, comprising at least two conveying channels arranged side by side, with straw-pulling chains provided on both sides of each conveying channel, wherein two adjacent conveying channels constitute a central conveying unit, wherein the two straw-pulling chains close to each other are central driven chains, and the two straw-pulling chains far from each other are central active chains, and the two central active chains extend from front to rear along the corresponding conveying channels, respectively, and their rear ends are used for power input, and the two central driven chains are provided at the front ends of the corresponding conveying channels and are connected to each other through a reversing mechanism, wherein one of the central driven chains extends backward for power input. The present invention reduces the number of long chains by optimizing the straw-pulling chain and its transmission mode, and changes a part of the long chains into short chains at the front end, which are driven by adjacent long chains. In this way, the number of long chains driven by the ear-picking roller is reduced, the number of required drive structures is also reduced, and the assembly is reasonable.

Description

Technical Field

[0001] The invention relates to a straw-pulling mechanism and a cutting platform and a corn harvester containing the same, belonging to the technical field of agricultural machinery. Background Art

[0002] On the cutting table of the existing corn harvester, the transmission method of the rice-pulling chains on both sides of the conveying channel is to transmit power one-to-one from the ear-picking roller. Each rice-pulling chain needs to extend from the front to the back, resulting in a large number of long chains on the cutting table. In addition, a drive structure corresponding to each ear-picking roller needs to be designed on the ear-picking roller. In a limited space, the drive structure is densely arranged, difficult to assemble, and easy to damage.

[0003] The difficulty in solving the above problem lies in the fact that crops need to pass through the middle of the conveying channel, and no structure can be set up to avoid obstruction of crop transportation. Therefore, some special transmission structures can only be set up in the gaps between adjacent conveying channels to change the transmission mode of the plowing chain and reduce the number of long chains to overcome the above problem. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a straw-pulling mechanism and a cutting platform and corn harvester containing the same. Starting from the conveying channel in the middle, the present invention designs a scheme in which the driven chains are close to each other and linked. By optimizing the straw-pulling chain and its transmission method, the number of long chains is reduced, and a part of the long chains is changed into short chains at the front end and driven by adjacent long chains. In this way, the number of long chains driven by the ear-picking roller is reduced, and the number of required driving structures is also reduced, so that reasonable assembly can be achieved in a limited space, thereby solving the above-mentioned problems.

[0005] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: a rice-pulling mechanism comprises at least two conveying channels arranged side by side, and rice-pulling chains are respectively provided on both sides of each of the conveying channels, wherein two adjacent conveying channels constitute a central conveying unit, and the two rice-pulling chains close to each other are central driven chains, and the two rice-pulling chains far away from each other are central active chains, and the two central active chains extend from front to rear along the corresponding conveying channels respectively, and their rear ends are used for power input, and the two central driven chains are arranged at the front ends of the corresponding conveying channels and are connected to each other through a reversing mechanism, and one of the central driven chains extends backward for power input.

[0006] The beneficial effects of the present invention are as follows: by optimizing the structure of the plowing chains of two adjacent conveying channels, the present invention reduces the power input of one of the four plowing chains in the two conveying channels, and instead drives the chain by another driven chain with power input, eliminating the need to extend the chain to the rear to connect with the ear-picking roller through a drive structure. This reduces the number of long chains without affecting the normal transport of crops through the conveying channels, allowing for reasonable assembly within a limited space. Furthermore, the plowing of the middle active chain alone can meet the feeding requirements, and the middle driven chain alone at the front end can also smooth the rear end of the conveying channel, making feeding smoother.

[0007] On the basis of the above technical solution, the present invention can also be improved as follows.

[0008] Furthermore, it comprises a plurality of the conveying channels, and every two adjacent conveying channels constitute the middle conveying unit.

[0009] The beneficial effect of adopting the above-mentioned further scheme is that the structure of the middle conveying unit composed of two adjacent conveying channels can be extended to the entire straw-pulling mechanism. The entire straw-pulling mechanism is equivalent to being composed of several middle conveying units arranged side by side. In this way, one of every four straw-pulling chains can use a short chain and be driven by another adjacent short chain. Overall, the number of long chain structures can be reduced by 1 / 4, so that the driving structure at the rear end ear-picking roller can also be reduced by 1 / 4, further saving assembly space.

[0010] Furthermore, it includes multiple conveying channels, and the other conveying channels are respectively located on at least one side of the middle conveying unit, and the rice-pulling chains of the other conveying channels close to the side of the middle conveying unit are side driven chains, and the rice-pulling chains away from the side of the middle conveying unit are side active chains. The side active chains extend from front to rear along the corresponding conveying channels, and the rear ends thereof are used for power input. The side driven chains are arranged at the front ends of the corresponding conveying channels, and are connected to the side active chains of the adjacent conveying channels or the middle active chains of the middle conveying unit through the reversing mechanism.

[0011] The beneficial effect of adopting the above-mentioned further scheme is that the middle conveying unit has a long middle active chain at both sides, and a reversing mechanism can be installed in the gap between it and the adjacent conveying channel for transmission. Therefore, other conveying channels can be set on one side or both sides of the middle conveying unit, and the side driven chain close to the middle conveying unit is used to connect with the corresponding active chain transmission. In this way, the long chain structure of other conveying units can be reduced by half, and the driving structure at the rear end ear picking roller can also be reduced by nearly 1 / 2, saving more assembly space, which is a better solution.

[0012] Further, it includes four of the said conveying channels. Two adjacent conveying channels in the middle form a middle conveying unit, and the other two conveying channels are respectively located on both sides of the middle conveying unit.

[0013] The beneficial effect of adopting the above further solution is based on the harvesting environment of current corn harvesters and other similar harvesters. Generally, four conveying channels are sufficient for crop harvesting. On this basis, the preferred solution is to set one conveying channel on each side of the middle conveying unit. The side driven chain of the conveying channel is in transmission connection with the middle driving chain in the middle of the middle conveying unit. Among the 8 reel chains, only 5 are long chain structures, and 3 only need to be set as short chains at the front end and do not need to be linked with the ear picker roller at the rear end.

[0014] Further, the middle driven chain, the middle driving chain, the side driving chain and the side driven chain are all double-chain structures and are all provided with tensioning devices.

[0015] Further, the tensioning devices of the side driven chain and the middle driven chain are elastic crank tensioning wheels, and the tensioning devices of the middle driving chain and the side driving chain are spring tensioning wheels.

[0016] The beneficial effect of adopting the above further solution is that the reel chain being a double-chain structure and being provided with a tensioning device belongs to the prior art. However, the present invention adopts two different tensioning devices, that is, it includes a spring tensioning wheel for the long chain and an elastic crank tensioning wheel for the short chain. For the reel chain that also extends backward in the middle driven chain, two elastic crank tensioning wheels can be respectively arranged at the front and the rear for tensioning.

[0017] Further, the reel chain includes at least two sprockets and a driving chain connecting the sprockets. The reversing mechanism includes two meshing reversing gears, two reversing sprockets and a reversing chain. One of the sprockets of one of the two reel chains that need to be in transmission connection is coaxially connected with one of the reversing gears. One of the sprockets of the other of the two reel chains that need to be in transmission connection is coaxially connected with a reversing sprocket. The other reversing gear is coaxially connected with the other reversing sprocket, and the two reversing sprockets are in transmission connection through the reversing chain.

[0018] The beneficial effect of adopting the above further solution is that in addition to connecting adjacent reel chains in transmission for linkage, the reversing mechanism also needs to make the rotation directions of these two reel chains opposite, so as to ensure that the reel chain on one side of the corresponding conveying channel rotates from front to back. Based on the existing way of driving the driving chain to rotate by the sprocket of the reel chain, setting the reversing mechanism into the above structure has a relatively simple structure and can be modified on the existing design.

[0019] Further, the reversing mechanism further includes an elastic crank tensioning wheel for tensioning the reversing chain.

[0020] The beneficial effect of adopting the above further solution is that the reversing chain also requires a tensioning structure to maintain tension. Since its length is short, it is more appropriate to use an elastic crank tensioning wheel.

[0021] The present invention also relates to a cutter bar, including a picking table frame and picking rollers installed on the picking table frame. The above-mentioned reel mechanism is also installed on the picking table frame, and the picking rollers are located behind the reel mechanism and provide power for it.

[0022] The present invention also relates to a corn harvester, including the above-mentioned cutter bar. Description of the Drawings

[0023] Figure 1 It is a top view of a cutter bar of the prior art;

[0024] Figure 2 It is a top view of a reel mechanism of the prior art;

[0025] Figure 3 It is a top view of Embodiment 1 of the reel mechanism of the present invention;

[0026] Figure 4 It is a top view of Scheme 1 of Embodiment 3 of the reel mechanism of the present invention;

[0027] Figure 5 It is a top view of Scheme 2 of Embodiment 3 of the reel mechanism of the present invention;

[0028] Figure 6 It is a top view of Scheme 3 of Embodiment 3 of the reel mechanism of the present invention;

[0029] Figure 7 It is a top view of the cutter bar of the present invention;

[0030] Figure 8 It is a front view of the cutter bar of the present invention (the reel chain and the reversing chain are omitted for easy understanding);

[0031] Figure 9 It is a schematic structural diagram of the cutter bar of the present invention from an inclined perspective (the reel chain and the reversing chain are simplified for easy understanding).

[0032] In the drawings, the list of components represented by each reference numeral is as follows:

[0033] 1. Conveyor channel, 2. Reel chain, 21. Middle driven chain, 22. Middle driving chain, 23. Side driven chain, 24. Side driving chain, 25. Spring tensioning wheel, 26. Elastic crank tensioning wheel, 27. Sprocket, 28. Driving chain, 3. Reversing mechanism, 31. Reversing gear, 32. Reversing sprocket, 33. Reversing chain, 4. Picking table frame, 5. Picking roller. Detailed Embodiments

[0034] The principles and features of the present invention are described below. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0035] like Figure 1 and Figure 2 As shown, in the prior art, all the rice-moving chains 2 on both sides of the rice-moving mechanism and the conveying channel 1 on the cutting platform are not divided into active chains and driven chains, and all extend from the front end to the back end, and are connected to the ear-picking rollers 5 installed on the ear-picking platform frame 4. This will result in more long chains on the cutting platform, and the ear-picking rollers 5 need to be designed with a drive structure corresponding to each ear-picking roller. The drive structures are densely arranged, and the structures on the ear-picking rollers 5 are too numerous, which makes assembly difficult and easy to damage.

[0036] like Figures 3 - 6 As shown, the present invention relates to a rice-pulling mechanism, comprising at least two conveying channels 1 arranged side by side, and rice-pulling chains 2 are respectively provided on both sides of each conveying channel 1, wherein two adjacent conveying channels 1 constitute a central conveying unit, and the two rice-pulling chains 2 close to each other are central driven chains 21, and the two rice-pulling chains 2 far away from each other are central active chains 22, and the two central active chains 22 respectively extend from front to rear along the corresponding conveying channels 1, and the rear ends thereof are used for power input, and the two central driven chains 21 are arranged at the front ends of the corresponding conveying channels 1, and are connected to each other through a reversing mechanism 3, and one of the central driven chains 21 extends backward for power input.

[0037] The present invention optimizes the structure of the plowing chains 2 of two adjacent conveying channels 1, reducing the power input of one of the four plowing chains 2 in the two conveying channels 1. Instead, the power input is driven by another middle driven chain 21 with power input, eliminating the need to extend to the rear to connect to the ear-picking roller 5 through a drive structure. This reduces the number of long chains without affecting the normal transport of crops through the conveying channels 1, achieving reasonable assembly within a limited space. Furthermore, the plowing of the middle active chain 22 can meet the feeding requirements, and the middle driven chain 21 at the front end alone can also smooth the rear end of the conveying channel 1, making feeding smoother.

[0038] Based on this basic structure, the present invention has the following multiple specific embodiments.

[0039] Example 1:

[0040] like Figure 3As shown, the straw-pulling mechanism has only two conveying channels 1, which together form the aforementioned middle conveying unit. While the prior art with two conveying channels 1 requires four long straw-pulling chains, Example 1 only requires three long straw-pulling chains. One middle driven chain 21 can be located solely at the front end of the conveying channel 1 and driven by another middle driven chain 21 via the reversing mechanism 3. Compared to the prior art, one less drive structure is required at the ear-pulling roller 5, making structural design and assembly more convenient.

[0041] Example 2:

[0042] The plowing mechanism includes a plurality of conveying channels 1, with each two adjacent conveying channels 1 forming the middle conveying unit. The above structure of the middle conveying unit formed by two adjacent conveying channels 1 can be extended to the entire plowing mechanism. The entire plowing mechanism is equivalent to being composed of several middle conveying units arranged side by side. In this way, one of every four plowing chains 2 can use a short chain and be driven by another adjacent short chain. Overall, the number of long chain structures can be reduced by 1 / 4. In this way, the drive structure at the rear end picking roller can also be reduced by 1 / 4, further saving assembly space.

[0043] Example 3:

[0044] like Figures 4 - 6 As shown, the rice-pulling mechanism includes a plurality of the conveying channels 1, and the other conveying channels 1 are respectively located on at least one side of the middle conveying unit, and the rice-pulling chains 2 of the other conveying channels 1 close to the side of the middle conveying unit are side driven chains 23, and the rice-pulling chains 2 away from the side of the middle conveying unit are side active chains 24. The side active chains 24 extend from front to rear along the corresponding conveying channels 1, and the rear ends thereof are used for power input. The side driven chains 23 are arranged at the front ends of the corresponding conveying channels 1, and are connected to the side active chains 24 of the adjacent conveying channels 1 or the middle active chain 22 of the middle conveying unit through the reversing mechanism 3.

[0045] Because the middle conveying unit is provided with a long middle active chain 22 on both sides, a reversing mechanism 3 can be installed in the gap between it and the adjacent conveying channel 1 for transmission, so the other conveying channels 1 can be set on one side or both sides of the middle conveying unit, and the side driven chain 23 close to the middle conveying unit is connected to the corresponding active chain transmission. In this way, the long chain structure of other conveying units can be reduced by half, and the driving structure at the rear end ear picking roller 5 can also be reduced by nearly 1 / 2, which saves more assembly space and is a better solution.

[0046] It can be understood that, among the four reel chains 2 in the middle conveying unit composed of the two adjacent conveying channels 1, one is a short chain, and among the reel chains 2 in the other conveying channels 1, half are short chains.

[0047] Example 3 includes the following three technical solutions:

[0048] Option 1: If Figure 4 As shown, it includes three conveying channels 1, of which two adjacent conveying channels 1 form a middle conveying unit, and the other conveying channel 1 is located on one side of the middle conveying unit. In this solution, there are a total of 6 reed chains 2, of which only 4 are long chain structures, and 2 only need to be set as short chains at the front end and do not need to be linked with the ear picking roller 5 at the rear end.

[0049] Option 2: If Figure 5 As shown, it includes four conveying channels 1, two adjacent conveying channels 1 in the middle form a middle conveying unit, and the other two conveying channels 1 are respectively located on both sides of the middle conveying unit. Based on the current harvesting environment of corn harvesters and other similar harvesters, four conveying channels 1 are generally sufficient for crop harvesting. On this basis, the preferred solution is to set a conveying channel 1 on each side of the middle conveying unit, and the side driven chain 23 of the conveying channel 1 is connected to the middle active chain 22 of the middle conveying unit. There are a total of 8 straw chains 2, of which only 5 are long chain structures, and 3 only need to be set as short chains at the front end, and do not need to be linked with the ear picking roller 5 at the rear end.

[0050] Option 3: If Figure 6 As shown, there are five conveying channels 1. Two adjacent conveying channels 1 in the middle form a central conveying unit. Another conveying channel 1 is located on one side of the central conveying unit, and the remaining two are located on the other side of the central conveying unit. In this solution, there are a total of 10 reed chains 2, of which only 6 are long chain structures. 4 only need to be set as short chains at the front end and do not need to be linked with the ear picking roller 5 at the rear end.

[0051] On the basis of the above embodiments, the middle driven chain 21 , the middle active chain 22 , the side active chain 24 and the side driven chain 23 are all double-chain structures and are all provided with tensioning devices.

[0052] Preferably, the tensioning devices of the side driven chain 23 and the middle driven chain 21 are elastic crank tensioners 26 , and the tensioning devices of the middle driving chain 22 and the side driving chain 24 are spring tensioners 25 .

[0053] The double-chain structure and the provision of a tensioning device for the plowing chain 2 belong to the prior art, but the present invention adopts two different tensioning devices, namely, a spring tensioning wheel 25 for the long chain and an elastic crank tensioning wheel 26 for the short chain. The plowing chain 2 in the middle driven chain 21 that also extends backward can be provided with two elastic crank tensioning wheels 26 at the front and rear, respectively, for tensioning.

[0054] The specific structures of the spring tensioner 25 and the elastic crank tensioner 26 are shown in the respective drawings. Since they belong to the prior art, the present invention will not elaborate on them here.

[0055] On the basis of the above embodiments, the plowing chain 2 includes at least two sprockets 27 and a drive chain 28 connecting the sprockets 27, the reversing mechanism 3 includes two mutually meshing reversing gears 31, two reversing sprockets 32 and a reversing chain 33, one of the sprockets 27 of one of the two plowing chains 2 that need to be connected in transmission is coaxially connected to one of the reversing gears 31, one of the sprockets 32 of the other of the two plowing chains 2 that need to be connected in transmission is coaxially connected to one of the reversing sprockets 32, the other reversing gear 31 is coaxially connected to the other reversing sprocket 32, and the two reversing sprockets 32 are transmission-connected via the reversing chain 33.

[0056] like Figure 5 and Figure 8 As shown, the reversing mechanism 3 not only needs to connect the adjacent reed chains 2 together for linkage, but also needs to make the rotation directions of the two reed chains 2 opposite, so that the reed chain 2 on the corresponding side of the conveying channel 1 can rotate from front to back. Based on the existing reed chain 2 driving the drive chain 28 to rotate through the sprocket 27, the reversing mechanism 3 is set to the above structure, which is relatively simple and can be modified on the existing design.

[0057] The long chain structure of the plowing chain 2 is conventional. If the plowing chain 2 is linear, each has a sprocket 27 at the front and rear ends, each of which is connected to a drive chain 28, such as the middle drive chain 22 or the side drive chain 24 located at the two edges in the various drawings. If a certain bending angle is required, each of the front, middle, and rear ends can have a sprocket 27, each of which is connected to a drive chain 28, such as the middle drive chain 22 or the side drive chain 24 located in the middle in the various drawings. The short chain structure of the plowing chain 2 is a linear plowing chain 2 formed at the front end of the bending angle, with each of the front and middle ends having a sprocket 27, each of which is connected to a drive chain 28. The more special one of the middle driven chains 21 is required to extend backward. Unlike the long chain structure, it is divided into two sections, front and back. The front section is the same as the other short chain structures, while the rear section has a sprocket 27 at the middle and rear ends, each of which is connected to an additional drive chain 28. The middle sprocket 27 is used to transmit power from the rear end to the front end. The driving chain 28 is also provided with a plowing protrusion for plowing the animal.

[0058] Specifically, a reversing gear 31 can be coaxially connected below the middle sprocket 27 of one of the two reel chains 2 that need to be drivingly connected, and the other reversing gear 31 meshes with it. To avoid affecting the conveyance of crops in the conveying channel 1, the other reversing gear 31 can be arranged in the gap between adjacent conveying channels 1 and is coaxially connected to a reversing sprocket 32. Another reversing sprocket 32 is coaxially connected below the middle sprocket 27 of the other one of the two reel chains 2 that need to be drivingly connected. After the reversing chain 33 bypasses the two reversing sprockets 32 (forming an integral linkage structure, the two reversing gears 31 rotate synchronously in opposite directions to achieve the rotation of the reversing chain 33, thereby driving the reversing sprocket 32 to rotate), the driving connection of the middle sprockets 27 of the two reel chains 2 is realized, and the rotation directions are opposite, meeting the function of conveying crops in the conveying channel 1.

[0059] Preferably, the reversing mechanism 3 further includes an elastic crank tensioning wheel 26 for tensioning the reversing chain 33. The reversing chain 33 also requires a tensioning structure to maintain tension. Since its length is short, it is more appropriate to use the elastic crank tensioning wheel 26.

[0060] As Figure 8 and Figure 9 As shown, the present invention also relates to a cutter bar, including a header frame 4 and a corn picker roll 5 installed on the header frame 4. The header frame 4 is also provided with the above-mentioned reel mechanism, and the corn picker roll 5 is located behind the reel mechanism and provides power for it. Other structures on the cutter bar, as well as the header frame 4 and the corn picker roll 5 itself, all belong to the prior art, and the drive structure on the corn picker roll 5 also belongs to the prior art. The purpose of the present invention is only to reduce its quantity to make its installation space sufficient, and its specific structure will not be described in detail here.

[0061] The present invention also relates to a corn harvester, including the above-mentioned cutter bar. In addition, if the harvesters of other crops involve corresponding conveying channels 1 and reel chains 2, the above-mentioned reel mechanism can also be adopted, which belongs to the protection scope of the present invention.

[0062] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "middle", "both sides", "upper", "lower", "front", "rear", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0063] In the present invention, unless otherwise clearly specified or limited, the terms "installed", "connected", "linked", "fixed", "drivably connected", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0064] In the present invention, unless otherwise clearly specified or limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0065] In the description of this specification, the descriptions referring to the terms "embodiment", "solution", etc. mean that the specific features, structures, materials or characteristics described in connection with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may 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.

[0066] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A threshing mechanism, comprising a plurality of conveying channels (1) arranged side by side, and threshing chains (2) are respectively arranged on both sides of each of the conveying channels (1), characterized in that, Two adjacent conveying channels (1) form a middle conveying unit, and the two reed chains (2) close to each other are middle driven chains (21), and the two reed chains (2) far away from each other are middle active chains (22). The two middle active chains (22) extend from front to back along the corresponding conveying channels (1), and their rear ends are used for power input. The two middle driven chains (21) are arranged at the front ends of the corresponding conveying channels (1) and are connected to each other through a reversing mechanism (3). One of the middle driven chains (21) extends backward for power input. The other conveying channels (1) are respectively located on at least one side of the middle conveying unit, and the reed chains (2) close to the side of the middle conveying unit of the other conveying channels (1) are side driven chains (23), and the reed chains (2) away from the side of the middle conveying unit are side active chains (24). The side active chains (24) extend from front to back along the corresponding conveying channels (1), and their rear ends are used for power input. The side driven chain (23) is arranged at the front end of the corresponding conveying channel (1), and is connected to the side driving chain (24) of the adjacent conveying channel (1) or the middle driving chain (22) of the middle conveying unit through the reversing mechanism (3); the reed chain (2) includes at least two sprockets (27) and a driving chain (28) connected to the sprockets (27); the reversing mechanism (3) includes two reversing gears (31) meshing with each other, two reversing sprockets (3 2) and a reversing chain (33), one of the sprockets (27) of one of the two reversing chains (2) that need to be connected in transmission is coaxially connected to a reversing gear (31), one of the sprockets (27) of the other of the two reversing chains (2) that need to be connected in transmission is coaxially connected to a reversing sprocket (32), the other reversing gear (31) is coaxially connected to the other reversing sprocket (32), and the two reversing sprockets (32) are connected in transmission via the reversing chain (33).

2. The threshing mechanism according to claim 1, characterized in that, It comprises four conveying channels (1), two adjacent conveying channels (1) in the middle constitute a middle conveying unit, and the other two conveying channels (1) are respectively located on both sides of the middle conveying unit.

3. The header mechanism according to claim 1 or 2, characterized in that The middle driven chain (21), the middle active chain (22), the side active chain (24) and the side driven chain (23) are all double-chain structures and are all provided with tensioning devices.

4. The threshing mechanism according to claim 3, wherein, The tensioning devices of the side driven chain (23) and the middle driven chain (21) are elastic crank tensioning wheels (26), and the tensioning devices of the middle active chain (22) and the side active chain (24) are spring tensioning wheels (25).

5. The threshing mechanism according to claim 1, characterized in that, The reversing mechanism (3) further comprises an elastic crank tensioning wheel (26) for tensioning the reversing chain (33).

6. A header, comprising a header frame (4) and snapping rolls (5) mounted on the header frame (4), characterized in that, The ear-picking stand (4) is also equipped with a straw-pulling mechanism as claimed in any one of claims 1 to 5, and the ear-picking roller (5) is located at the rear side of the straw-pulling mechanism and provides power for the straw-pulling mechanism.

7. A corn harvester, characterized in that, Comprising the header as claimed in claim 6.

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