Harvester floating roller height adjustment mechanism, harvester bridge passing transmission structure, and harvester

Abstract

The utility model relates to the technical field of height adjusting of floating roller of harvester, specifically relates to a kind of height adjusting mechanism of floating roller of harvester, overbridge drive structure for harvester and harvester.The height adjusting mechanism of floating roller of harvester includes two mounting plates and two height adjusting structures, and height adjusting structure includes support member and rotating operating member, support member is rotatably installed in mounting plate, support member has first support surface and second support surface for supporting floating roller, the interval of first support surface and the rotating center of support member is greater than the interval of second support surface and the rotating center of support member;Rotating operating member is fixedly installed in support member;Based on the driving of rotating operating member, support member can rotate and support floating roller with first support surface or second support surface.The height adjusting mechanism of floating roller of harvester of the utility model does not need to disassemble relevant parts, so that the height adjusting work of floating roller can be relatively time-saving and labor-saving.

Description

Technical Field

[0001] This utility model relates to the field of harvester floating roller height adjustment technology, specifically to a harvester floating roller height adjustment mechanism, a harvester bridge transmission structure, and a harvester. Background Technology

[0002] In combine harvesters, a chain rake is mounted on a floating roller. The floating roller drives the chain rake to rotate, and the chain rake applies force to the crop grains being conveyed, making the grains move downstream more smoothly. Before harvesting crops, workers fine-tune the height of the floating roller according to the size of the crop grains, so that the chain rake is in the optimal position. For example, when harvesting large-grain crops such as corn, the floating roller is adjusted to a higher position, so that the chain rake works at a higher position; when harvesting small-grain crops such as wheat, the floating roller is adjusted to a lower position, so that the chain rake works at a lower position.

[0003] When adjusting the height of the floating roller, the floating roller needs to be supported first with a fixing tool (to facilitate the disassembly of the support components). Then, the support components used to support the floating roller are removed using a wrench or other disassembly tools. The support components are then reinstalled in another position. Finally, the fixing tool is removed so that the support components support the floating roller in the new position.

[0004] However, adjusting the height of the floating roller requires disassembling and installing related components, making the height adjustment work time-consuming and labor-intensive. Utility Model Content

[0005] The purpose of this utility model is to solve the following technical problem: adjusting the height of the floating roller requires disassembling and installing related parts, which is time-consuming and labor-intensive.

[0006] To achieve the above objectives, this utility model provides a harvester floating roller height adjustment mechanism. This mechanism includes two mounting plates and two height adjustment structures, with each mounting plate corresponding to one of the height adjustment structures. Each height adjustment structure includes a support member and a rotating operating member. The support member is rotatably mounted on the mounting plates and has a first support surface and a second support surface for supporting the floating roller. The distance between the first support surface and the rotation center of the support member is greater than the distance between the second support surface and the rotation center of the support member, allowing the support member to have two different support heights. The rotating operating member is fixedly mounted on the support member and used to rotate the support member. Based on the driving of the rotating operating member, the support member can rotate and support the floating roller with either the first or second support surface, enabling the floating roller to operate at the corresponding height.

[0007] In some embodiments, the height adjustment structure includes an adjusting bolt and an adjusting nut. The adjusting bolt passes through the middle of the support member, the head of the adjusting bolt is located inside the mounting plate and connected to the support member, and the adjusting nut is threaded onto the shank of the adjusting bolt. The adjusting nut is located outside the mounting plate, and a preset distance is formed between the adjusting nut and the mounting plate.

[0008] In some embodiments, the support member includes a support block configured as a cuboid, the support block being located inside the mounting plate, and an adjusting bolt passing through the center of the support block; a rotating operating member is fixedly installed with the support block; the support block has four sides distributed around the rotation center, the four sides including a first support surface and a second support surface; the distance between the first support surface and the rotation center is greater than the distance between the second support surface and the rotation center.

[0009] In some embodiments, the support block is provided with a cylindrical first mounting hole and a hexagonal second mounting hole. The first mounting hole is disposed between the second mounting hole and the mounting plate. The shank of the adjusting bolt moves through the first mounting hole, and the head of the adjusting bolt is embedded in the second mounting hole and is restricted from rotation by the second mounting hole.

[0010] In some embodiments, the height adjustment structure includes a limiting member connected to the mounting plate, the limiting member being used to maintain a preset distance between the adjusting nut and the mounting plate.

[0011] In some embodiments, the limiting member includes a cylindrical sleeve and an annular limiting flange; the sleeve is movably sleeved on the rod of the adjusting bolt, the sleeve movably passes through the mounting plate, one end of the sleeve contacts the support block, and the other end of the sleeve is provided with a limiting flange, the limiting flange surrounds the rod of the adjusting bolt, the limiting flange is located outside the mounting plate and spaced apart from the mounting plate, and the limiting flange contacts the adjusting nut.

[0012] In some embodiments, the mounting plate has an arc-shaped elongated hole, the rotating operating member is movably inserted through the elongated hole, and a part of the rotating operating member is located on the outside of the mounting plate; wherein, during the movement of the rotating operating member along the elongated hole, the support member can rotate at a preset angle so that the first support surface or the second support surface supports the floating roller.

[0013] In some embodiments, the rotating actuating element is a pin.

[0014] This utility model also provides a bridge transmission structure for a harvester, which includes a floating roller, a harvester floating roller height adjustment mechanism as described in the above embodiment, and two connecting arms; the two ends of the floating roller are rotatably connected to the two connecting arms, the two connecting arms are respectively connected to two mounting plates, and the connecting arms can move and be positioned relative to the mounting plates, and the bottoms of the two connecting arms respectively abut against the first support surface or the second support surface of the two support members.

[0015] This utility model also provides a harvester, which includes the harvester bridge transmission structure of the above embodiments.

[0016] The above-mentioned technical solution of this utility model has the following beneficial effects:

[0017] The support component has a first support surface and a second support surface for supporting the floating roller. The distance between the first support surface and the rotation center of the support component is greater than the distance between the second support surface and the rotation center of the support component, thus allowing the support component to form two different support heights. When the first support surface of the support component is used to support the floating roller, the support height of the support component is higher, so the floating roller operates at a higher position, making it more suitable for conveying large-grain crops. When the second support surface of the support component is used to support the floating roller, the support height of the support component is lower, so the floating roller operates at a lower position, making it more suitable for conveying small-grain crops. When it is necessary to adjust the height of the floating roller, firstly, the floating roller is supported using a fixing tool. Then, the rotating operating component is driven, which causes the support component to rotate, switching the part of the support component supporting the floating roller from the first support surface to the second support surface, thereby allowing the floating roller to operate at a relatively lower position; or switching the part of the support component supporting the floating roller from the second support surface to the first support surface, thereby allowing the floating roller to operate at a relatively higher position. Finally, the fixing tool is removed, completing the height adjustment of the floating roller. Therefore, by using the harvester floating roller height adjustment mechanism of this utility model, the height of the floating roller can be adjusted simply by operating the rotating operating component to rotate the support component, without disassembling related parts, making the height adjustment of the floating roller relatively time-saving and labor-saving. Attached Figure Description

[0018] Figure 1 This is a three-dimensional schematic diagram of a bridge transmission structure for a harvester in one embodiment of the present invention;

[0019] Figure 2 This is a cross-sectional schematic diagram of a harvester's bridge transmission structure in one embodiment of the present invention;

[0020] Figure 3 yes Figure 2 A magnified view of part A in the middle;

[0021] Figure 4 This is a schematic diagram of the distribution of elongated holes in one embodiment of the present invention;

[0022] Figure 5 yes Figure 4 A magnified view of part B in the middle section;

[0023] Figure 6 This is a schematic diagram of a height adjustment structure supporting a floating roller in one embodiment of the present invention;

[0024] Figure 7 This is a schematic diagram showing the distribution of the first support surface and the second support surface in one embodiment of the present invention;

[0025] Figure 8 This is a schematic diagram showing the distribution of the first mounting hole and the second mounting hole in one embodiment of this utility model.

[0026] Explanation of reference numerals in the attached figures

[0027] 1. Mounting plate; 11. Elongated holes;

[0028] 2. Height adjustment structure; 21. Support component; 211. Support block; 212. First support surface; 213. Second support surface; 214. First mounting hole; 215. Second mounting hole; 22. Rotation operating component; 23. Adjusting bolt; 24. Adjusting nut; 25. Limiting component; 251. Sleeve; 252. Limiting flange;

[0029] 3. Floating roller;

[0030] 4. Connecting arm. Detailed Implementation

[0031] The features and exemplary embodiments of various aspects of this utility model will now be described in detail. To make the objectives, technical solutions, and advantages of this utility model clearer, the following description, in conjunction with the accompanying drawings and specific embodiments, will provide a further detailed description. It should be understood that the specific embodiments described herein are intended only to explain this utility model and not to limit it. For those skilled in the art, this utility model can be implemented without some of these specific details. The following description of the embodiments is merely to provide a better understanding of this utility model by illustrating examples of it.

[0032] like Figures 1 to 6As shown, this utility model provides a harvester floating roller height adjustment mechanism, which includes two mounting plates 1 and two height adjustment structures 2, with each mounting plate 1 corresponding to one of the two height adjustment structures 2. The height adjustment structure 2 includes a support member 21 and a rotating operating member 22. The support member 21 is rotatably mounted on the mounting plate 1 and has a first support surface 212 and a second support surface 213 for supporting the floating roller 3. The distance between the first support surface 212 and the rotation center of the support member 21 is greater than the distance between the second support surface 213 and the rotation center of the support member 21, so that the support member 21 has two different support heights. The rotating operating member 22 is fixedly mounted on the support member 21 and is used to rotate the support member 21. Based on the driving of the rotating operating member 22, the support member 21 can rotate and support the floating roller 3 with either the first support surface 212 or the second support surface 213, so that the floating roller 3 can operate at the corresponding height.

[0033] Specifically, the support member 21 has a first support surface 212 and a second support surface 213 for supporting the floating roller 3. The distance between the first support surface 212 and the rotation center of the support member 21 is greater than the distance between the second support surface 213 and the rotation center of the support member 21, so the support member 21 can form two different support heights. When the first support surface 212 of the support member 21 is used to support the floating roller 3, the support height of the support member 21 is higher, so the operating position of the floating roller 3 is higher, which is more suitable for conveying large-grain crops. When the second support surface 213 of the support member 21 is used to support the floating roller 3, the support height of the support member 21 is lower, so the operating position of the floating roller 3 is lower, which is more suitable for conveying small-grain crops. When the height of the floating roller 3 needs to be adjusted, first use a fixing tool to support the floating roller (to facilitate the rotation of the support member 21), then drive the rotating operating member 22. The rotating operating member 22 can drive the support member 21 to rotate, so that the part of the support member 21 supporting the floating roller 3 changes from the first support surface 212 to the second support surface 213, thereby allowing the floating roller 3 to switch to a relatively lower position; or the part of the support member 21 supporting the floating roller 3 changes from the second support surface 213 to the first support surface 212, thereby allowing the floating roller 3 to switch to a relatively higher position. Finally, remove the fixing tool to complete the height adjustment of the floating roller 3. Therefore, by using the harvester floating roller height adjustment mechanism of this utility model, only the rotating operating member 22 needs to be operated to rotate the support member 21 to adjust the height of the floating roller 3, without disassembling related parts, making the height adjustment of the floating roller 3 relatively time-saving and labor-saving.

[0034] In some embodiments, the distance between the first support surface 212 and the rotation center of the support member 21 is defined as the first distance, and the distance between the second support surface 213 and the rotation center of the support member 21 is defined as the second distance. The difference between the first distance and the second distance can be in the range of 15mm-65mm.

[0035] It should be noted that the rotating operating component 22 can be driven by manual force; or it can be driven by auxiliary tools, such as motor drive. This utility model does not impose any restrictions.

[0036] It should also be noted that the support member 21 has two different support heights, but the actual values ​​of these two support heights can be determined by those skilled in the art based on actual working conditions, and this utility model does not impose any restrictions. For example, assuming that the top surface of the bridge bottom plate (the bridge bottom plate is a conventional component of the harvester, and the bridge bottom plate is located directly below the floating roller 3, not shown in the figure) is used as the reference plane, the distance between the first support surface 212 and the reference plane is set to 141 mm, and the distance between the second support surface 213 and the reference plane is set to 114 mm, then the two support heights of the support member 21 are 141 mm and 114 mm, respectively. Of course, the value of each support height can be set higher or lower according to actual working conditions. In addition, using the top surface of the bridge bottom plate (not shown in the figure) as the reference plane is merely for the convenience of those skilled in the art; the ground or the surface of other conventional components of the harvester can also be used as the reference plane, and this utility model does not impose any restrictions on this either.

[0037] like Figures 1 to 6 As shown, in some embodiments of this utility model, the height adjustment structure 2 includes an adjusting bolt 23 and an adjusting nut 24. The adjusting bolt 23 passes through the middle of the support member 21, and the head of the adjusting bolt 23 is located inside the mounting plate 1 and connected to the support member 21. The adjusting nut 24 is threaded onto the rod of the adjusting bolt 23, and the adjusting nut 24 is located outside the mounting plate 1, and a preset distance is formed between the adjusting nut 24 and the mounting plate 1.

[0038] Specifically, the support member 21 is connected to the mounting plate 1 via adjusting bolts 23 and adjusting nuts 24, and a preset distance is formed between the adjusting nuts 24 and the mounting plate 1. Therefore, the support member 21 is not clamped and fixed to the mounting plate 1 by the adjusting bolts 23 and adjusting nuts 24, and the support member 21 can rotate relative to the mounting plate 1 via the adjusting bolts 23 and adjusting nuts 24. In addition, those skilled in the art can determine the specific value of the preset distance according to the actual working conditions. For example, the range of the preset distance can be 1mm-3mm.

[0039] Of course, the support member 21 can also be rotatably connected to the mounting plate 1 through other components, such as pins, etc. This utility model does not impose any restrictions.

[0040] like Figure 3 and Figure 6 As shown, in some embodiments of this utility model, the support member 21 includes a support block 211 configured as a cuboid, the support block 211 is located inside the mounting plate 1, and an adjusting bolt 23 is provided in the middle of the support block 211; the rotating operating member 22 is fixedly installed with the support block 211; the support block 211 has four sides distributed around the rotation center, including a first support surface 212 and a second support surface 213; the distance between the first support surface 212 and the rotation center is greater than the distance between the second support surface 213 and the rotation center.

[0041] Specifically, the thickness direction of the support block 211 is consistent with the thickness direction of the mounting plate 1, and the adjusting bolt 23 extends along the thickness direction of the support block 211 or along the thickness direction of the mounting plate 1. The support block 211 has four sides distributed around the rotation center of the support block 211, two of which are the sides with the long side and the other two are the sides with the wide side. The sides with the long side are relatively close to the rotation center of the support block 211, and the sides with the wide side are relatively far from the rotation center of the support block 211. Therefore, one of the sides with the wide side can serve as the first support surface 212, and one of the sides with the long side can serve as the second support surface 213. When the rotation operating member 22 is driven, the rotation operating member 22 can drive the support block 211 to rotate, so that the side of the support floating roller 3 of the support block 211 changes from the first support surface 212 to the second support surface 213, or changes from the second support surface 213 to the first support surface 212.

[0042] In some embodiments, the support member 21 may also be configured in other structural forms, such as a hollow ellipsoid, an elliptical plate, or a cross with different lengths and widths, etc., which are not limited by this utility model.

[0043] like Figure 3 , Figure 7 and Figure 8 As shown, in some embodiments of this utility model, the support block 211 is provided with a cylindrical first mounting hole 214 and a hexagonal second mounting hole 215. The first mounting hole 214 is disposed between the second mounting hole 215 and the mounting plate 1. The rod of the adjusting bolt 23 moves through the first mounting hole 214, and the head of the adjusting bolt 23 is embedded in the second mounting hole 215 and is restricted from rotating by the second mounting hole 215.

[0044] Specifically, the head of the adjusting bolt 23 is hexagonal prism-shaped, and the shank of the adjusting bolt 23 is cylindrical. When assembling the height adjustment structure 2, the adjusting bolt 23 is passed through the second mounting hole 215 in sequence, and the head of the adjusting bolt 23 is embedded in the second mounting hole 215. The second mounting hole 215 can restrict the rotation of the head of the adjusting bolt 23, making it convenient to install the adjusting nut 24 on the shank of the adjusting bolt 23.

[0045] In some embodiments, the support block 211 includes a first support body and a second support body, the first support body and the second support body are fitted together and welded together, the first support body is located between the second support body and the mounting plate 1, a first mounting hole 214 is provided in the first support body, and a second mounting hole 215 is provided in the second support body.

[0046] like Figures 2 to 3 As shown, in some embodiments of this utility model, the height adjustment structure 2 includes a limiting member 25, which is connected to the mounting plate 1. The limiting member 25 is used to maintain a preset distance between the adjusting nut 24 and the mounting plate 1.

[0047] Specifically, by setting the limiting component 25, a preset distance can be maintained between the adjusting nut 24 and the mounting plate 1, preventing the support block 211 from being clamped and fixed to the mounting plate 1 by the adjusting nut 24 and the adjusting bolt 23. Therefore, the support block 211 can rotate relative to the mounting plate 1 through the adjusting bolt 23 and the adjusting nut 24. In addition, those skilled in the art can determine the specific value of the preset distance according to the actual working conditions. For example, the range of the preset distance can be 1mm-3mm.

[0048] like Figure 3 As shown, in some embodiments of this utility model, the limiting member 25 includes a cylindrical sleeve 251 and an annular limiting flange 252; the sleeve 251 is movably sleeved on the rod of the adjusting bolt 23, the sleeve 251 moves through the mounting plate 1, one end of the sleeve 251 contacts the support block 211, and the other end of the sleeve 251 is provided with a limiting flange 252, the limiting flange 252 surrounds the rod of the adjusting bolt 23, the limiting flange 252 is located outside the mounting plate 1 and spaced apart from the mounting plate 1, and the limiting flange 252 contacts the adjusting nut 24.

[0049] Specifically, the head of the adjusting bolt 23 can be pressed against the support block 211, the adjusting nut 24 can be pressed against the limiting flange 252, and the sleeve 251 and the support block 211 are pressed against each other. The sleeve 251 and the limiting flange 252 can restrict the adjusting nut 24, preventing the adjusting nut 24 from pressing against the mounting plate 1, thereby preventing the support block 211 from being clamped and fixed to the mounting plate 1 by the adjusting nut 24 and the adjusting bolt 23.

[0050] In some embodiments, the outer diameter of the limiting flange 252 is larger than the outer diameter of the adjusting nut 24. In some embodiments, the sleeve 251 and the limiting flange 252 are integrally formed. In some embodiments, a gasket is provided between the limiting flange 252 and the adjusting nut 24.

[0051] Of course, the limiting member 25 can also be in other structural forms, such as a thrust ball bearing, etc. This utility model does not impose any restrictions.

[0052] like Figures 4 to 5 As shown, in some embodiments of this utility model, the mounting plate 1 is provided with an arc-shaped elongated hole 11, and the rotating operating member 22 is movably inserted through the elongated hole 11, with a portion of the rotating operating member 22 located on the outer side of the mounting plate 1. During the movement of the rotating operating member 22 along the elongated hole 11, the support member 21 can rotate at a preset angle so that the first support surface 212 or the second support surface 213 supports the floating roller 3.

[0053] Specifically, the elongated hole 11 is arc-shaped, and its center is located at the rotation center of the support member 21. The movement trajectory of the rotating operating member 22 is also an arc, and it is parallel to the extension trajectory of the elongated hole 11. When the rotating operating member 22 is located at one end of the elongated hole 11, the first support surface 212 can support the floating roller 3; after the rotating operating member 22 is driven to the other end of the elongated hole 11, the support member 21 rotates, and the second support surface 213 can support the floating roller 3. The elongated hole 11 can limit the rotation angle of the rotating operating member 22, improving operational convenience.

[0054] In some embodiments, the support member 21 includes a cuboid support block 211, and a rotation operating member 22 is fixedly installed on the support block 211. The rotation operating member 22 moves through the elongated hole 11, and the central angle of the arc where the elongated hole 11 is located is 90 degrees. In this case, the support member 21 needs to rotate at a preset angle of 90 degrees. Of course, when the support member 21 has other structural forms, the central angle of the arc where the elongated hole 11 is located can also be other angles. In this case, the support member 21 needs to rotate at a preset angle of other values. For example, depending on the structural form of the support member 21, those skilled in the art can set the preset angle to 30 degrees, 60 degrees, or 85 degrees, etc., and this utility model does not impose any limitations.

[0055] In other embodiments, the rotating operating member 22 can be fixed to the support block 211, and the rotating operating member 22 is installed on the side of the support block 211 facing away from the corresponding mounting plate 1, that is, the rotating operating member 22 does not need to move through the mounting plate 1.

[0056] like Figures 3 to 5 As shown, in some embodiments of this utility model, the rotating operating member 22 is a pin.

[0057] Specifically, the pin can be fixed to the support member 21 by welding or plugging; or, the pin can be fixed to the support block 211 by welding or plugging.

[0058] In some embodiments, the support block 211 is provided with a positioning hole into which a pin is inserted, and an interference fit is formed between the pin and the positioning hole to fix the pin. The pin extends from the inside of the mounting plate 1 to the outside of the mounting plate 1 through the elongated hole 11, and the operator can drive the portion of the pin located on the outside of the mounting plate 1.

[0059] In some embodiments, the rotating operating member 22 may also be a pull ring or a wire rope or other component that facilitates the application of force; this utility model does not impose any limitations.

[0060] like Figures 1 to 6 As shown, this utility model also provides a bridge transmission structure for a harvester, which includes a floating roller 3, a harvester floating roller height adjustment mechanism as described in the above embodiment, and two connecting arms 4. The two ends of the floating roller 3 are rotatably connected to the two connecting arms 4, which are respectively connected to two mounting plates 1. The connecting arms 4 are movable and positioned relative to the mounting plates 1, and the bottoms of the two connecting arms 4 respectively press against the first support surface 212 or the second support surface 213 of the two support members 21.

[0061] Specifically, the harvester's bridge drive structure adopts the harvester floating roller height adjustment mechanism of the above embodiment, so the harvester's bridge drive structure can also achieve the above-mentioned technical effects. Furthermore, the rotational connection between the connecting arm 4 and the floating roller 3, and the connection between the connecting arm 4 and the mounting plate 1, are not improvements of this utility model; those skilled in the art can refer to existing technology, and this utility model will not elaborate further.

[0062] This utility model also provides a harvester, which includes the harvester bridge transmission structure of the above embodiments.

[0063] Specifically, the harvester adopts the harvester bridge transmission structure of the above embodiment, so the harvesting can also achieve the above technical effects.

[0064] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The above examples are only for the purpose of helping to understand the method and core ideas of this utility model. The above are only preferred embodiments of this utility model. It should be noted that due to the limitations of textual expression, while there are objectively infinite specific structures, those skilled in the art can make several improvements, modifications, or changes without departing from the principles of this utility model, and can also combine the above technical features in an appropriate manner. These improvements, modifications, changes, or combinations, or the direct application of the concept and technical solution of this utility model to other occasions without modification, should all be considered within the protection scope of this utility model.

Claims

1. A height adjustment mechanism for a harvester's floating roller, characterized in that, It includes two mounting plates (1) and two height adjustment structures (2), with the two mounting plates (1) and the two height adjustment structures (2) corresponding one-to-one; The height adjustment structure (2) includes a support member (21) and a rotation operating member (22). The support member (21) is rotatably mounted on the mounting plate (1). The support member (21) has a first support surface (212) and a second support surface (213) for supporting the floating roller (3). The distance between the first support surface (212) and the rotation center of the support member (21) is greater than the distance between the second support surface (213) and the rotation center of the support member (21), so that the support member (21) has two different support heights. The rotation operating member (22) is fixedly mounted on the support member (21) and is used to rotate the support member (21). Based on the drive of the rotating operating member (22), the support member (21) can rotate and support the floating roller (3) with the first support surface (212) or the second support surface (213) so that the floating roller (3) can run at the corresponding height.

2. The harvester floating roller height adjustment mechanism according to claim 1, characterized in that, The height adjustment structure (2) includes an adjusting bolt (23) and an adjusting nut (24). The adjusting bolt (23) passes through the middle of the support member (21). The head of the adjusting bolt (23) is located inside the mounting plate (1) and connected to the support member (21). The adjusting nut (24) is threaded onto the rod of the adjusting bolt (23). The adjusting nut (24) is located outside the mounting plate (1), and a preset distance is formed between the adjusting nut (24) and the mounting plate (1).

3. The harvester floating roller height adjustment mechanism according to claim 2, characterized in that, The support member (21) includes a support block (211) configured as a cuboid, the support block (211) being located inside the mounting plate (1), and the adjusting bolt (23) passing through the middle of the support block (211); the rotating operating member (22) is fixedly installed with the support block (211); The support block (211) has four sides distributed around the rotation center, including the first support surface (212) and the second support surface (213); the distance between the first support surface (212) and the rotation center is greater than the distance between the second support surface (213) and the rotation center.

4. The harvester floating roller height adjustment mechanism according to claim 3, characterized in that, The support block (211) is provided with a cylindrical first mounting hole (214) and a hexagonal second mounting hole (215). The first mounting hole (214) is located between the second mounting hole (215) and the mounting plate (1). The rod of the adjusting bolt (23) moves through the first mounting hole (214), and the head of the adjusting bolt (23) is embedded in the second mounting hole (215) and is restricted from rotating by the second mounting hole (215).

5. The harvester floating roller height adjustment mechanism according to claim 3, characterized in that, The height adjustment structure (2) includes a limiting member (25), which is connected to the mounting plate (1). The limiting member (25) is used to maintain the preset distance between the adjusting nut (24) and the mounting plate (1).

6. The harvester floating roller height adjustment mechanism according to claim 5, characterized in that, The limiting member (25) includes a cylindrical sleeve (251) and an annular limiting flange (252). The sleeve (251) is movably sleeved on the rod of the adjusting bolt (23). The sleeve (251) moves through the mounting plate (1). One end of the sleeve (251) contacts the support block (211). The other end of the sleeve (251) is provided with the limiting flange (252). The limiting flange (252) surrounds the rod of the adjusting bolt (23). The limiting flange (252) is located on the outside of the mounting plate (1) and is spaced apart from the mounting plate (1). The limiting flange (252) contacts the adjusting nut (24).

7. The harvester floating roller height adjustment mechanism according to claim 1, characterized in that, The mounting plate (1) is provided with an arc-shaped elongated hole (11), the rotating operating member (22) is movably inserted through the elongated hole (11), and a part of the rotating operating member (22) is located on the outside of the mounting plate (1); During the movement of the rotating operating member (22) along the elongated hole (11), the support member (21) can rotate at a preset angle so that the first support surface (212) or the second support surface (213) supports the floating roller (3).

8. The harvester floating roller height adjustment mechanism according to claim 7, characterized in that, The rotating operating component (22) is a pin.

9. A bridge transmission structure for a harvester, characterized in that, Includes a floating roller (3), a harvester floating roller height adjustment mechanism according to any one of claims 1-8, and two connecting arms (4). The two ends of the floating roller (3) are rotatably connected to the two connecting arms (4), the two connecting arms (4) are respectively connected to the two mounting plates (1), and the connecting arms (4) can move and be positioned relative to the mounting plates (1). The bottoms of the two connecting arms (4) press against the first support surface (212) or the second support surface (213) of the two support members (21).

10. A harvester, characterized in that, Includes the bridge drive structure for harvesters as described in claim 9.

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