Straw lifting device and grain harvester

Abstract

This application provides a waste lifting device and a grain harvester. The waste lifting device includes a collection trough, a conveying mechanism, a re-threshing mechanism, and an adjusting mechanism. The collection trough is disposed below the cleaning screen of the grain harvester to collect waste grains falling from the cleaning screen. The conveying mechanism is configured to lift the waste in the collection trough upwards. The re-threshing mechanism includes a first housing, a re-threshing wheel, and a friction plate. The first housing is disposed above the sorting screen of the grain harvester to receive the lifted waste and includes two vertical walls extending in a plane perpendicular to the transverse direction of the grain harvester and a side wall disposed between the vertical walls. The re-threshing wheel is rotatably mounted within the first housing. The friction plate is sealed and mounted in an opening formed in the side wall and is configured to re-thresh the waste by cooperating with the re-threshing wheel. The adjusting mechanism is configured to adjust the gap between the friction plate and the re-threshing wheel by driving the friction plate to rotate relative to the side wall.

Description

Technical Field

[0001] At least one embodiment of this application relates to the field of agricultural machinery technology, and more specifically, to a waste conveying device and a grain harvester. Background Technology

[0002] During the operation of grain harvesters (such as combine harvesters for grain crops like wheat, corn, and rice), after the crop is initially threshed by the threshing drum, the threshed material enters the cleaning system for separation. With the assistance of a blower, the cleaning screen separates most of the clean grains from the impurities. The clean grains fall into the grain collection trough and are transported to the grain bin, while the mixture discharged from the tail end of the cleaning screen (i.e., the impurities) usually contains unthreshed grains, broken ears of grain, and chopped straw. If this impurity is not treated promptly or thoroughly, on the one hand, recyclable grains will be discarded along with the impurities, resulting in grain loss; on the other hand, the accumulation of impurities may also clog the harvester's passage, affecting the overall operating efficiency of the machine.

[0003] In related technologies, waste conveying devices primarily function as material transport systems. A conveying mechanism transports waste to the feed inlet of the main threshing drum, allowing it to merge with newly harvested crops and enter the main threshing unit for secondary threshing. However, after the waste returns to the main threshing unit, its material characteristics differ significantly from those of fresh crops. When the waste proportion is high, it easily accumulates at the drum inlet, causing blockages. More importantly, the operating parameters of the main threshing drum are optimized for fresh crops, making it difficult to effectively thresh the more robust broken ears or ear remnants within the waste. This results in poor secondary threshing of the waste, with some recyclable grains being discharged with it. Summary of the Invention

[0004] To address at least one of the technical problems mentioned above and others in the prior art, embodiments of this application provide a waste conveying device with an independent re-threshing mechanism and adjustment structure, which can flexibly adjust the threshing gap according to the threshing requirements of different crops.

[0005] Embodiments of this application provide a waste removal device, including a collection trough, a conveying mechanism, a re-threshing mechanism, and an adjusting mechanism. The collection trough is disposed below the cleaning screen of a grain harvester to collect waste grains falling from the cleaning screen. The conveying mechanism is configured to lift the waste grains in the collection trough upwards. The re-threshing mechanism includes a first housing, a re-threshing wheel, and a friction plate. The first housing is disposed above the sorting screen of the grain harvester to receive the lifted waste grains and includes two vertical walls extending in a plane perpendicular to the transverse direction of the grain harvester, and a side wall disposed between the vertical walls. The re-threshing wheel is rotatably mounted within the first housing. The friction plate is hermetically mounted in an opening formed in the side wall and is configured to re-thresh the waste grains in cooperation with the re-threshing wheel. The adjusting mechanism is configured to adjust the gap between the friction plate and the re-threshing wheel by driving the friction plate to rotate relative to the side wall.

[0006] According to an embodiment of this application, one end of the friction plate is hinged to the upper edge of the sidewall opening via a hinge shaft extending in the lateral direction. An adjustment mechanism is mounted on the end of the friction plate away from the hinge shaft and is configured to adjust the radial clearance between the friction plate and the re-release wheel by driving the friction plate to rotate about the hinge shaft.

[0007] According to an embodiment of this application, the adjustment mechanism includes a drive shaft, a handle, and a linkage assembly. The drive shaft is rotatably mounted on two vertical walls about an axis extending in the lateral direction. The handle is connected to the drive shaft on the outer side of the outer wall of the two vertical walls to drive the drive shaft to rotate. The first end of the linkage assembly is fixedly connected to the drive shaft, and the second end is movably connected to the outer side of the friction plate. The rotation of the drive shaft causes the linkage assembly to swing, causing the friction plate to rotate about a hinge axis.

[0008] According to an embodiment of this application, the adjusting mechanism further includes a limiting plate. The limiting plate is fixedly connected to the outside of the friction plate, and an elongated hole is provided on the limiting plate. The second end of the connecting rod assembly passes through the elongated hole to constrain the swing trajectory of the friction plate by moving within the elongated hole.

[0009] According to an embodiment of this application, the adjustment mechanism further includes an arc-shaped plate and a positioning pin. The arc-shaped plate is fixedly installed on the outer side of the outer wall, and at least two positioning holes are provided on the arc-shaped plate at intervals along the rotation direction of the handle. The positioning pin passes through a locking hole and a positioning hole on the handle to restrict the rotation of the handle.

[0010] According to an embodiment of this application, the conveying mechanism includes a lower auger and a lifting mechanism. The lower auger is arranged laterally in the collection trough to horizontally convey the impurities in the collection trough. The lower inlet of the lifting mechanism is connected to the output end of the lower auger to convey the impurities upward.

[0011] According to an embodiment of this application, the lifting mechanism includes a second housing, a first chain, and multiple scrapers. The lower part of the second housing has an openable and closable lower cleaning door. The first chain runs around the interior of the second housing. The multiple scrapers are fixedly connected to the first chain to convey impurities upwards into the first housing.

[0012] According to an embodiment of this application, the waste conveying device further includes a recycling mechanism. The recycling mechanism includes a third housing and an upper auger. Multiple through holes are provided on the bottom wall of the third housing, and an openable and closable upper cleaning door is provided at one end of the third housing. The upper auger is rotatably installed inside the third housing.

[0013] According to an embodiment of this application, the waste conveying device further includes a transmission device. The transmission device includes a belt, a re-detachment sprocket, an upper auger sprocket, a lifting sprocket, a second chain, and a tensioning mechanism. The belt is sleeved on the input pulley of the re-detachment sprocket to drive the re-detachment sprocket to rotate. The re-detachment sprocket is coaxially fixed to the rotating shaft of the re-detachment sprocket. The upper auger sprocket is fixedly connected to the input shaft of the upper auger. The lifting sprocket is fixedly connected to the drive sprocket of the lifting mechanism. The second chain sequentially passes around the re-detachment sprocket, the upper auger sprocket, and the lifting sprocket to transmit power. The tensioning mechanism abuts against the slack side of the second chain to adjust the tension of the second chain.

[0014] Embodiments of this application also provide a grain harvester, including a frame, a waste conveying device, a threshing device, and a cleaning system. The waste conveying device is mounted on the frame. The threshing device is mounted on the frame to perform initial threshing of the grains. The cleaning system is mounted on the frame and includes a cleaning screen and a sorting screen. The cleaning screen performs initial screening of the grains after the initial threshing, and the screened waste enters the collection trough of the waste conveying device. The sorting screen is located below the recovery mechanism of the waste conveying device to perform secondary screening of the waste after the secondary threshing by the waste conveying device.

[0015] According to the waste conveying device of this application embodiment, by setting an independent re-threshing mechanism, the waste can be re-threshed after being conveyed, and the waste will not flow back to the main threshing device to mix with the new crop, reducing the load on the main threshing device and lowering the risk of blockage. At the same time, by adjusting the mechanism to drive the friction plate to rotate relative to the side wall to change the threshing gap with the re-threshing wheel, the re-threshing intensity can be flexibly adjusted according to the grain size and threshing difficulty of different crops, improving the grain recovery rate and the adaptability of the waste conveying device. Attached Figure Description

[0016] The above and other objects, features and advantages of this application will become clearer from the following description of embodiments with reference to the accompanying drawings, in which:

[0017] Figure 1This schematic diagram illustrates a perspective view of the impurity conveying device, cleaning screen, and sorting screen according to an embodiment of this application.

[0018] Figure 2 Schematic illustration Figure 1 A three-dimensional schematic diagram of the impurity conveying device, cleaning screen, and sorting screen from another perspective;

[0019] Figure 3 A perspective view of a waste lifting device according to an embodiment of this application is schematically shown;

[0020] Figure 4 Schematic illustration Figure 3 A three-dimensional schematic diagram of the re-removal mechanism and the adjustment mechanism of the waste lifting device shown;

[0021] Figure 5 Schematic illustration Figure 4 An enlarged schematic diagram of part A in the middle;

[0022] Figure 6 Schematic illustration Figure 4 A plan perspective view of the re-extraction mechanism of the waste lifting device shown;

[0023] Figure 7 Schematic illustration Figure 3 A plan perspective view of the lifting mechanism of the waste conveying device shown;

[0024] Figure 8 Schematic illustration Figure 3 A plan perspective view of the recovery mechanism of the waste conveying device shown;

[0025] Figure 9 Schematic illustration Figure 3 A plan view of the transmission device of the waste lifting device shown.

[0026] In the accompanying drawings, the meanings of the reference numerals are as follows:

[0027] 1. Collection tank;

[0028] 2. Conveying mechanism;

[0029] 21. Lower the dragon;

[0030] 22. Upgrade the organization;

[0031] 221. Second shell;

[0032] 222. Clean the bottom door;

[0033] 223. The first link in the chain;

[0034] 224. Scraper;

[0035] 3. Re-extraction mechanism;

[0036] 31. First shell;

[0037] 311. Vertical wall;

[0038] 312. Side wall;

[0039] 32. Re-detachment wheel;

[0040] 33. Friction plate;

[0041] 34. Hinge shaft;

[0042] 4. Adjustment mechanism;

[0043] 41. Drive shaft;

[0044] 42. Handle;

[0045] 43. Linkage assembly;

[0046] 44. Limiting plate;

[0047] 45. Long hole;

[0048] 46. ​​Curved plate;

[0049] 47. Positioning holes;

[0050] 48. Positioning pin;

[0051] 5. Recycling organizations;

[0052] 51. Third shell;

[0053] 52. The upper dragon is stirred;

[0054] 53. Clean the door;

[0055] 6. Transmission device;

[0056] 61. Belt;

[0057] 62. Repeat sprocket;

[0058] 63. Install the upper auger sprocket;

[0059] 64. Lift the sprocket;

[0060] 65. The second chain;

[0061] 66. Tensioning mechanism;

[0062] A. Cleaning and screening;

[0063] B. Sorting and sieving. Detailed Implementation

[0064] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with specific embodiments and the accompanying drawings.

[0065] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of this application. The terms “comprising,” “including,” etc., as used herein indicate the presence of the stated features, steps, operations, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, or components.

[0066] All terms used herein, including technical and scientific terms, have the meanings commonly understood by those skilled in the art, unless otherwise defined. It should be noted that the terms used herein are to be interpreted in a manner consistent with the context of this specification, and not in an idealized or overly rigid way.

[0067] When using expressions such as "at least one of A, B, and C", they should generally be interpreted in accordance with the meaning commonly understood by those skilled in the art. For example, "a system having at least one of A, B, and C" should include, but is not limited to, a system having A alone, having B alone, having C alone, having A and B, having A and C, having B and C, and / or having A, B, and C.

[0068] It should also be noted that the directional terms mentioned in the embodiments, such as "up," "down," "front," "back," "left," and "right," are only for reference to the directions in the accompanying drawings and are not intended to limit the scope of protection of this application. Throughout the drawings, the same elements are represented by the same or similar reference numerals. Conventional structures or constructions will be omitted where they may cause confusion in understanding this application.

[0069] During field operations of grain harvesters (such as combine harvesters used for harvesting grain crops like wheat, corn, and rice), after the crop is cut by the header and fed into the threshing drum for initial threshing, the threshed material immediately enters the cleaning system. The cleaning system typically consists of a cleaning screen and a blower working together to separate the threshed material according to its characteristics using the dual action of screening and air separation: the heavier, cleaner grains pass through the screen holes and fall into the grain collection trough, where they are transported to the grain bin for centralized storage; while lighter impurities (such as husks, broken leaves, etc.) are blown out of the machine by the airflow; the material in between, namely the residue discharged from the tail end of the cleaning screen, contains a large amount of unthreshed grains, broken ears, short stems, and broken straw. If this waste is not handled in a timely and effective manner, on the one hand, the recyclable grains mixed in with it will be discarded along with the waste, directly causing grain loss; on the other hand, if the waste accumulates or flows poorly in the conveying channel, it will also block the relevant passages of the harvester, thereby affecting the continuity and efficiency of the whole machine operation.

[0070] In related technologies, common waste conveying devices primarily function as material transporters. These devices guide waste into the feed inlet of the main threshing drum, mixing it with freshly harvested crops before it enters the main threshing unit for secondary threshing. Because the moisture content of waste decreases and the degree of straw fiberization increases after the initial threshing, its physical properties differ significantly from fresh crops. When waste constitutes a high proportion of the feed material, it easily accumulates at the inlet of the threshing drum, leading to poor feeding or even blockage and machine shutdown. Furthermore, the operating parameters of the main threshing drum (including rotational speed and threshing gap) are typically optimized for the threshing characteristics of fresh crops, making it difficult to effectively thresh irregularly shaped and more resilient broken ears or ear remnants from the waste. Therefore, the secondary threshing effect is often unsatisfactory, with a considerable proportion of grains remaining in the waste and ultimately discharged with the waste, resulting in unnecessary grain loss.

[0071] Figure 1 The illustration shows a perspective view of the impurity conveying device, cleaning screen, and sorting screen according to an embodiment of this application. Figure 2 Schematic illustration Figure 1 The diagram shows a three-dimensional view of the impurity conveying device, cleaning screen, and sorting screen from another perspective. Figure 3 A perspective view of a waste lifting device according to an embodiment of this application is shown schematically. Figure 4 Schematic illustration Figure 3 A three-dimensional schematic diagram of the re-removal mechanism and the adjustment mechanism of the waste lifting device shown. Figure 5 Schematic illustration Figure 4 An enlarged schematic diagram of part A in the middle. Figure 6 Schematic illustration Figure 4 A plan perspective view of the re-extraction mechanism of the waste lifting device shown.

[0072] like Figures 1 to 6As shown, this application provides a waste lifting device, including a collection trough 1, a conveying mechanism 2, a re-threshing mechanism 3, and an adjusting mechanism 4. The collection trough 1 is disposed below the cleaning screen A of a grain harvester to collect waste grains falling from the cleaning screen A. The conveying mechanism 2 is configured to lift the waste in the collection trough 1 upwards. The re-threshing mechanism 3 includes a first housing 31, a re-threshing wheel 32, and a friction plate 33. The first housing 31 is disposed above the sorting screen B of the grain harvester to receive the lifted waste, and includes two vertical walls 311 extending in a plane perpendicular to the transverse direction of the grain harvester, and a side wall 312 disposed between the vertical walls 311. The re-threshing wheel 32 is rotatably mounted within the first housing 31. The friction plate 33 is sealedly mounted in an opening formed in the side wall 312 and is configured to re-thresh the waste in cooperation with the re-threshing wheel 32. The adjustment mechanism 4 is configured to adjust the gap between the friction plate 33 and the re-release wheel 32 by driving the friction plate 33 to rotate relative to the side wall 312.

[0073] In some exemplary embodiments, a waste conveying device is installed on the grain harvester to handle the waste mixture discharged from the tail of the cleaning screen A. During harvesting, the cleaning screen A performs initial screening of the threshed material. Clean grains pass through the screen holes and fall into the grain collection trough and are conveyed to the grain bin, while waste (containing unthreshed grains, broken ears, chopped straw, etc.) is discharged from the tail of the cleaning screen A and falls into the collection trough 1. The collection trough 1 is located below the waste outlet of the cleaning screen A, and its width is adapted to the width of the cleaning screen A to ensure that all waste falls into the collection trough 1 without spillage. The lower end of the conveying mechanism 2 communicates with the internal space of the collection trough 1, and the upper end communicates with the internal space of the re-threshing mechanism 3, thereby lifting the waste in the collection trough 1 upwards and sending it into the re-threshing mechanism 3.

[0074] In some exemplary embodiments, the re-threshing mechanism 3 includes a first housing 31, a re-threshing wheel 32, and a friction plate 33. The first housing 31 is located above the side of the sorting screen B extending in the longitudinal direction (i.e., the direction of travel of the grain harvester), and is used to receive the impurities lifted up by the conveying mechanism 2. The first housing 31 includes two vertical walls 311 and a side wall 312 disposed between the two vertical walls 311. The two vertical walls 311 extend in a plane perpendicular to the transverse direction of the grain harvester (i.e., a direction perpendicular to the longitudinal direction in the horizontal plane), and the side wall 312 is located between and connects the two vertical walls 311. The re-threshing wheel 32 is rotatably mounted in the first housing 31 by bearings, and has threshing elements (e.g., threshing teeth or threshing bars) on its outer circumferential surface for applying a striking and rubbing action to the impurities during rotation. An opening is formed on the side wall 312, and a friction plate 33 is sealed and installed at the opening. The inner surface of the friction plate 33 is an arc-shaped working surface that matches the shape of the outer peripheral surface of the re-threshing wheel 32 and faces the threshing teeth of the re-threshing wheel 32, forming a threshing gap between them. When impurities enter the threshing gap, the rotational motion of the re-threshing wheel 32 carries the impurities into the threshing gap. The arc-shaped working surface of the friction plate 33 provides a rubbing support surface, and works in conjunction with the re-threshing wheel 32 to apply a striking and rubbing action to the impurities, thereby removing the unthreshed kernels from the broken ears or ear remnants.

[0075] In some exemplary embodiments, the adjusting mechanism 4 is connected to the outer side of the friction plate 33 and is used to drive the friction plate 33 to rotate relative to the side wall 312. When the adjusting mechanism 4 drives the friction plate 33 to rotate about its hinge point, the threshing gap between the inner surface of the friction plate 33 and the outer peripheral surface of the re-threshing wheel 32 changes accordingly. When the friction plate 33 rotates towards the re-threshing wheel 32, the threshing gap decreases, and the impurities are subjected to stronger squeezing and kneading action as they pass through, which is suitable for crops that are difficult to thresh; when the friction plate 33 rotates away from the re-threshing wheel 32, the threshing gap increases, and the kneading action on the impurities is weakened, which is suitable for crops with easily threshed or easily broken grains.

[0076] According to the impurity conveying device of the present invention, by setting an independent re-threshing mechanism 3, the impurities can be re-threshed immediately after being conveyed, eliminating the need to transport the impurities to the main threshing drum for re-threshing. This achieves efficient processing of impurities and effective recovery of grains. Simultaneously, by driving the friction plate 33 to rotate relative to the side wall 312 through the adjusting mechanism 4, the threshing gap between the friction plate 33 and the re-threshing wheel 32 can be flexibly adjusted. This allows the re-threshing intensity to be adjusted according to the crop type and threshing difficulty, providing a matching threshing gap for different crops' grain size, ear structure, and threshing difficulty. This avoids grain breakage due to an excessively small gap and insufficient threshing rate due to an excessively large gap.

[0077] like Figures 4 to 6As shown, according to an embodiment of this application, one end of the friction plate 33 is hinged to the upper edge of the opening in the sidewall 312 via a hinge shaft 34 extending in the lateral direction. An adjustment mechanism 4 is mounted on the end of the friction plate 33 away from the hinge shaft 34 and is configured to adjust the radial clearance between the friction plate 33 and the re-release wheel 32 by driving the friction plate 33 to rotate about the hinge shaft 34.

[0078] In some exemplary embodiments, the hinge shaft 34 extends laterally, with its two ends fixedly mounted on two vertical walls 311, respectively. The hinge shaft 34 is located at the upper edge of the opening in the side wall 312. The upper end of the friction plate 33 is hinged between the two vertical walls 311 via the hinge shaft 34. The lower end of the friction plate 33 extends into the interior of the first housing 31 through the opening in the side wall 312, and the lower edge of the friction plate 33 is located below the lower edge of the opening, overlapping with the inner surface of the side wall 312 below the lower edge of the opening. This overlapping structure ensures that the lower edge of the friction plate 33 remains below the lower edge of the opening throughout its entire stroke of swinging around the hinge shaft 34, and the opening is always covered by the friction plate 33, preventing impurities from leaking from the gap between the friction plate 33 and the lower edge of the opening to the outside of the first housing 31 during the re-detachment process. It can be understood that when the radial clearance between the friction plate 33 and the re-ejection wheel 32 is at its minimum, both vertical walls 311 protrude from the friction plate 33 in the radial direction, so that when the friction plate 33 rotates outward to increase the radial clearance, the two sides of the friction plate 33 are always located between the two vertical walls 311, so as to maintain the sealing connection between the friction plate 33, the two vertical walls 311 and the side wall 312.

[0079] In another embodiment, the lower edge of the friction plate 33 is connected to the lower edge of the opening by a telescopic plate, so that the lower edge of the friction plate 33 is always sealed to the lower edge of the opening by the telescopic plate throughout the entire stroke of the friction plate 33 swinging around the hinge axis 34, and the opening is always covered by the friction plate 33.

[0080] In some exemplary embodiments, the adjustment mechanism 4 is mounted on the end of the friction plate 33 away from the hinge axis 34, i.e., the lower end of the friction plate 33. When the adjustment mechanism 4 applies a driving force to the friction plate 33, the lower end of the friction plate 33 swings about the hinge axis 34, thereby causing a positional change of the inner surface of the friction plate 33 relative to the re-release wheel 32. Since one end of the friction plate 33 is hinged to the upper edge of the opening in the side wall 312, and the adjustment mechanism 4 acts on the other end of the friction plate 33, the operator can control the swing angle of the friction plate 33 by operating the adjustment mechanism 4, thereby adjusting the radial clearance between the friction plate 33 and the re-release wheel 32.

[0081] According to the above embodiments of the present invention, by hinged one end of the friction plate 33 to the upper edge of the opening in the side wall 312, and connecting the adjusting mechanism 4 to the end of the friction plate 33 away from the hinge axis 34, the adjusting mechanism 4 only needs to apply a small driving force to drive the friction plate 33 to rotate, making operation labor-saving. The swing angle of the friction plate 33 can be obtained by adjusting the driving stroke of the adjusting mechanism 4, thereby realizing the control of the threshing gap and ensuring the accuracy of threshing gap adjustment under different crop conditions.

[0082] like Figures 4 to 6 As shown, according to an embodiment of this application, the adjustment mechanism 4 includes a drive shaft 41, a handle 42, and a linkage assembly 43. The drive shaft 41 is rotatably mounted on two upright walls 311 about an axis extending in the transverse direction. The handle 42 is connected to the drive shaft 41 on the outer side of the outer wall of the two upright walls 311 to drive the drive shaft 41 to rotate. The first end of the linkage assembly 43 is fixedly connected to the drive shaft 41, and the second end is movably connected to the outer side of the friction plate 33. The rotation of the drive shaft 41 causes the linkage assembly 43 to swing, causing the friction plate 33 to rotate about the hinge axis 34. The adjustment mechanism 4 also includes a limiting plate 44. The limiting plate 44 is fixedly connected to the outer side of the friction plate 33, and the limiting plate 44 is provided with an elongated hole 45. The second end of the linkage assembly 43 passes through the elongated hole 45 to constrain the swing trajectory of the friction plate 33 by moving within the elongated hole 45.

[0083] In some exemplary embodiments, the drive shaft 41 extends laterally, with its two ends rotatably mounted on two vertical walls 311 via bearings. The drive shaft 41 extends outward through the outer wall of the two vertical walls 311, and a handle 42 is fixedly connected to the end of the drive shaft 41 on the outer side of the outer wall. When the operator pulls the handle 42, the drive shaft 41 can be driven to rotate about its own axis. The first end of the linkage assembly 43 is fixedly connected to the drive shaft 41, and the second end of the linkage assembly 43 passes through an elongated hole 45 on the limiting plate 44 on the outer surface of the friction plate 33, and can slide within the elongated hole 45. When the drive shaft 41 rotates, the linkage assembly 43 swings synchronously with the drive shaft 41, pushing the outer side of the friction plate 33, causing the friction plate 33 to rotate about the hinge axis 34. During the swinging process of the linkage assembly 43, the second end of the linkage assembly 43 slides in the elongated hole 45. The elongated hole 45 limits the swinging range of the linkage assembly 43 by constraining the motion trajectory of the second end of the linkage assembly 43, thereby constraining the swinging trajectory of the friction plate 33.

[0084] According to the above embodiments of the present invention, by providing a drive shaft 41, a handle 42 connected to the drive shaft 41, and a connecting rod assembly 43, the rotational motion can be transmitted through the drive shaft 41 and the connecting rod assembly 43 to the friction plate 33 swinging around the hinge shaft 34 by simply moving the handle 42 outside the first housing 31, thereby conveniently adjusting the threshing gap. At the same time, by providing an elongated hole 45 on the limiting plate 44 fixedly connected to the outside of the friction plate 33, and by passing the second end of the connecting rod assembly 43 through the elongated hole 45, the second end of the connecting rod assembly 43 is constrained by the elongated hole 45 during the swinging process and moves along a predetermined trajectory, thereby keeping the swing trajectory of the friction plate 33 stable and avoiding gap adjustment deviation caused by excessive or insufficient swinging of the connecting rod assembly 43.

[0085] like Figures 4 to 6 As shown in the embodiment of this application, the adjustment mechanism 4 further includes an arc-shaped plate 46 and a positioning pin 48. The arc-shaped plate 46 is fixedly installed on the outer side of the outer wall, and at least two positioning holes 47 are provided on the arc-shaped plate 46 at intervals along the rotation direction of the handle 42. The positioning pin 48 passes through a locking hole and a positioning hole 47 on the handle 42 to restrict the rotation of the handle 42.

[0086] In some exemplary embodiments, the arc-shaped plate 46 is fixedly installed on the outer side of the outer wall of one of the two vertical walls 311, and the arc-shaped extension direction of the arc-shaped plate 46 is consistent with the rotation direction of the handle 42. At least two positioning holes 47 are spaced apart on the arc-shaped plate 46 along the rotation direction of the handle 42. Each positioning hole 47 is distributed at different angular positions along the rotation path of the handle 42, and each positioning hole 47 corresponds to a preset gap position between the friction plate 33 and the re-release wheel 32. A corresponding locking hole is provided on the handle 42. When the handle 42 rotates to a certain angle, the locking hole aligns with the positioning hole 47 at that angle position, and the positioning pin 48 passes through both the locking hole and the positioning hole 47, locking the handle 42 onto the arc-shaped plate 46 and preventing the handle 42 from continuing to rotate. In use, the operator pulls the positioning pin 48 out of the current positioning hole 47 and the locking hole, allowing the handle 42 to rotate freely; after moving the handle 42 to the target position, the positioning pin 48 is inserted into the locking hole and the corresponding positioning hole 47, locking the handle 42. By inserting the positioning pin 48 into the positioning holes 47 at different positions, the handle 42 can be locked at different rotation angles, thereby obtaining different threshing gaps.

[0087] According to the above embodiments of the present invention, by setting an arc plate 46, positioning holes 47 spaced apart on the arc plate 46, and positioning pins 48, the handle 42 is locked at different rotation angles when the positioning pins 48 are inserted into the positioning holes 47 at different positions. This achieves rapid switching and accurate locking of multiple threshing gaps, allowing the operator to complete the adjustment without the aid of tools. Furthermore, the gap position corresponding to each positioning hole 47 is determined, ensuring the consistency and repeatability of gap adjustment under different operating conditions. At the same time, the cooperation structure between the positioning pins 48 and the arc plate 46 is simple, and the locking is reliable under the vibration condition of the harvester.

[0088] Figure 7 Schematic illustration Figure 3 A plan perspective view of the lifting mechanism of the waste conveying device shown.

[0089] like Figure 3 and Figure 7 As shown in the embodiment of this application, the conveying mechanism 2 includes a lower auger 21 and a lifting mechanism 22. The lower auger 21 is arranged laterally in the collection trough 1 to horizontally convey the impurities in the collection trough 1. The lower inlet of the lifting mechanism 22 is connected to the output end of the lower auger 21 to convey the impurities upward. The lifting mechanism 22 includes a second housing 221, a first chain 223, and a plurality of scrapers 224. The lower part of the second housing 221 is provided with an openable and closable lower cleaning door 222. The first chain 223 runs around the inside of the second housing 221. The plurality of scrapers 224 are fixedly connected to the first chain 223 to convey the impurities upward into the first housing 31.

[0090] In some exemplary embodiments, the lower auger 21 is arranged laterally within the collection trough 1. When the lower auger 21 rotates, it pushes the impurities falling into the collection trough 1 to the lifting mechanism 22, thus collecting and conveying the impurities horizontally within the collection trough 1. The lifting mechanism 22 is arranged vertically, with a feed inlet at its lower end. This feed inlet connects to the output end of the lower auger 21, allowing the impurities pushed by the lower auger 21 to directly enter the lower end of the lifting mechanism 22. The lifting mechanism 22 includes a second housing 221, a first chain 223, and multiple scrapers 224. The second housing 221 has a cylindrical structure, with an internal lifting channel for impurities to pass through. The lower part of the second housing 221 has an openable and closable lower cleaning door 222, which is opened by the operator to clean the accumulated material at the bottom of the second housing 221 when blockage occurs. The first chain 223 runs around the inside of the second housing 221, and the multiple scrapers 224 are fixedly connected to the first chain 223. When the first chain 223 is running, the scraper 224 moves synchronously with the first chain 223. The scraper 224 located at the bottom of the second housing 221 scrapes up the impurities entering the feed inlet and, with the operation of the first chain 223, scrapes the impurities upward and finally discharges them from the upper outlet of the second housing 221 and enters the first housing 31 of the re-extraction mechanism 3.

[0091] According to the above embodiments of the present invention, by setting the lower auger 21, the impurities are horizontally gathered in the collection tank 1 and pushed to the lower feed port of the lifting mechanism 22. At the same time, by fixing multiple scrapers 224 to the first chain 223 that runs around inside the second housing 221, a smooth transition of the impurities from horizontal conveying to vertical lifting is achieved. The scrapers 224 continuously scrape and convey the impurities during the upward movement, avoiding material accumulation at the output end of the lower auger 21. The openable and closable lower cleaning door 222 provided at the lower part of the second housing 221 can be opened for cleaning when blockage occurs, improving the convenience of maintenance.

[0092] Figure 8 Schematic illustration Figure 3 A plan perspective view of the recovery mechanism of the waste conveying device shown.

[0093] like Figure 8 As shown in the embodiment of this application, the waste conveying device further includes a recycling mechanism 5. The recycling mechanism 5 includes a third housing 51 and an upper auger 52. The bottom shell wall of the third housing 51 has multiple through holes, and one end of the third housing 51 is provided with an openable and closable upper cleaning door 53. The upper auger 52 is rotatably installed inside the third housing 51.

[0094] In some exemplary embodiments, the recycling mechanism 5 is disposed between the discharge port of the re-extraction mechanism 3 and the sorting screen B, for conveying the material processed by the re-extraction mechanism 3 to the sorting screen B. The third housing 51 is a cylindrical structure extending laterally, with its inlet end connected to the discharge port of the re-extraction mechanism 3 to receive the re-extracted material. Multiple through holes are provided on the bottom shell wall of the third housing 51, distributed along the extension direction of the third housing 51, for allowing the material conveyed by the upper auger 52 to be evenly distributed from the bottom to the sorting screen B below. One end of the third housing 51 is provided with an openable and closable upper cleaning door 53, for opening and cleaning the accumulated material inside the third housing 51 when blockage occurs. The upper auger 52 is rotatably mounted inside the third housing 51 along the extension direction of the third housing 51. When it rotates, it pushes the material from the re-extraction mechanism 3 along the axial direction of the third housing 51, causing the material to gradually fall from the through holes on the bottom shell wall during the pushing process.

[0095] According to the above embodiments of the present invention, by opening multiple through holes on the bottom shell wall of the third shell 51, the material pushed by the upper auger 52 gradually falls from the through holes during the axial movement along the third shell 51, thereby achieving uniform distribution of the material in the width direction of the sorting screen B; at the same time, the openable and closable upper cleaning door 53 provided at one end of the third shell 51 can be opened for cleaning when blockage occurs, improving the convenience of maintenance.

[0096] Figure 9 Schematic illustration Figure 3A plan view of the transmission device of the waste lifting device shown.

[0097] like Figure 9 As shown in the embodiment of this application, the waste conveying device further includes a transmission device 6. The transmission device 6 includes a belt 61, a re-detachment sprocket 62, an upper auger sprocket 63, a lifting sprocket 64, a second chain 65, and a tensioning mechanism 66. The belt 61 is sleeved on the input pulley of the re-detachment wheel 32 to drive the re-detachment wheel 32 to rotate. The re-detachment sprocket 62 is coaxially fixed on the rotating shaft of the re-detachment wheel 32. The upper auger sprocket 63 is fixedly connected to the input shaft of the upper auger 52. The lifting sprocket 64 is fixedly connected to the drive sprocket of the lifting mechanism 22. The second chain 65 sequentially passes around the re-detachment sprocket 62, the upper auger sprocket 63, and the lifting sprocket 64 to transmit power. The tensioning mechanism 66 abuts against the slack side of the second chain 65 to adjust the tension of the second chain 65.

[0098] In some exemplary embodiments, a belt 61 is fitted onto the input pulley of the retractor 32, and power is transmitted to the retractor 32 via the belt 61 to drive its rotation. A retractor sprocket 62 is coaxially fixed to the shaft of the retractor 32 and rotates synchronously with it. An upper auger sprocket 63 is fixedly connected to the input shaft of the upper auger 52, and a lifting sprocket 64 is fixedly connected to the drive sprocket of the lifting mechanism 22. A second chain 65 passes sequentially around the retractor sprocket 62, the upper auger sprocket 63, and the lifting sprocket 64. The retractor sprocket 62, acting as the drive sprocket, transmits power simultaneously to both the upper auger sprocket 63 and the lifting sprocket 64 via the second chain 65, thereby synchronously driving the upper auger 52 and the lifting mechanism 22. A tensioning mechanism 66 abuts against the slack side of the second chain 65 to adjust the tension of the second chain 65, preventing it from skipping teeth or falling off during operation due to slack.

[0099] According to the above embodiments of the present invention, power is transmitted to the re-detachment pulley 32 via the belt 61, and then to the re-detachment sprocket 62 coaxially fixed on the shaft of the re-detachment pulley 32, and the second chain 65 sequentially passing over the re-detachment sprocket 62, the upper auger sprocket 63 and the lifting sprocket 64, thereby achieving synchronous drive of the re-detachment pulley 32, the upper auger 52 and the lifting mechanism 22 by a single power source, simplifying the transmission structure; at the same time, the tensioning mechanism 66 abuts against the slack side of the second chain 65 to adjust the tension of the second chain 65, ensuring that the second chain 65 always maintains an appropriate tension during operation, avoiding tooth skipping, falling off or abnormal noise caused by chain slack, and improving transmission reliability.

[0100] Reference Figure 1 and Figure 2This application also provides a grain harvester, including a frame, a waste conveying device, a threshing device, and a cleaning system. The waste conveying device is mounted on the frame. The threshing device is mounted on the frame to perform primary threshing of the grains. The cleaning system is mounted on the frame and includes a cleaning screen A and a sorting screen B. The cleaning screen A performs primary screening of the grains after the primary threshing, and the screened waste enters the collection trough 1 of the waste conveying device. The sorting screen B is located below the recovery mechanism 5 of the waste conveying device to perform secondary screening of the waste after secondary threshing by the waste conveying device.

[0101] In some exemplary embodiments, the threshing device is mounted on the frame of the grain harvester for primary threshing of the crop. The threshed material enters the cleaning system. A cleaning screen A of the cleaning system is located below the threshing device and is used for primary screening of the threshed material. With the assistance of a blower airflow, clean grains pass through the screen holes and fall into the grain collection trough and are conveyed to the grain bin. Impurities (containing unthreshed grains, broken ears, and chopped straw) are discharged from the tail end of cleaning screen A and enter the collection trough 1 of the impurity lifting device. After secondary threshing by the impurity lifting device, the impurities are discharged by the recovery mechanism 5 and fall onto the sorting screen B. The sorting screen B is located below the recovery mechanism 5 and is used for secondary screening of the threshed material. The separated clean grains fall into the grain collection trough and are conveyed to the grain bin, while waste is discharged outside the machine.

[0102] According to the embodiments of this application, the grain harvester, by setting up a matching waste lifting device, allows the waste to be re-threshed during the lifting process, eliminating the need to transport the waste back to the main threshing device. This reduces the load on the main threshing device and lowers power consumption and the risk of blockage. The threshing gap of the re-threshing mechanism 3 can be flexibly adjusted according to different crops, making the grain harvester suitable for harvesting various grain crops such as wheat, corn, and rice. At the same time, after re-threshing, the waste is directly separated by the sorting screen B, eliminating the need for cyclic threshing and resulting in high operating efficiency.

[0103] The embodiments of this application have been described above. However, these embodiments are merely illustrative and not intended to limit the scope of this application. Although various embodiments have been described above, this does not mean that the measures in the various embodiments cannot be used advantageously in combination. The scope of this application is defined by the appended claims and their equivalents. Various substitutions and modifications can be made by those skilled in the art without departing from the scope of this application, and all such substitutions and modifications should fall within the scope of this application.

Claims

1. A waste material lifting device, characterized in that, include: A collection trough is located below the cleaning screen of the grain harvester to collect the impurities of the grains falling from the cleaning screen. A conveying mechanism is configured to lift the impurities in the collection tank upwards; Re-extraction institutions include: A first housing is disposed above the sorting screen of the grain harvester to receive the lifted impurities, and includes two vertical walls extending in a plane perpendicular to the lateral direction of the grain harvester, and a side wall disposed between the vertical walls. The re-release wheel is rotatably mounted within the first housing; and A friction plate, hermetically mounted on an opening formed in the sidewall, is configured to re-remove the impurities in cooperation with a re-removal wheel; and The adjustment mechanism is configured to adjust the gap between the friction plate and the re-release wheel by driving the friction plate to rotate relative to the side wall.

2. The waste conveying device according to claim 1, characterized in that, One end of the friction plate is hinged to the upper edge of the sidewall opening via a hinge shaft extending in the lateral direction; The adjustment mechanism is mounted on the end of the friction plate away from the hinge axis and is configured to adjust the radial clearance between the friction plate and the re-release wheel by driving the friction plate to rotate about the hinge axis.

3. The waste conveying device according to claim 2, characterized in that, The adjustment mechanism includes: A drive shaft is rotatably mounted on the two vertical walls about an axis extending in the lateral direction; A handle, connected to the drive shaft on the outer side of the outer wall of the two upright walls, to drive the drive shaft to rotate; and The linkage assembly has a first end fixedly connected to the drive shaft and a second end movably connected to the outside of the friction plate; The rotation of the drive shaft causes the connecting rod assembly to swing, causing the friction plate to rotate around the hinge axis.

4. The waste conveying device according to claim 3, characterized in that, The adjustment mechanism also includes: A limiting plate is fixedly connected to the outside of the friction plate, and the limiting plate is provided with an elongated hole; The second end of the linkage assembly passes through the elongated hole to constrain the swing trajectory of the friction plate by moving within the elongated hole.

5. The waste conveying device according to claim 3, characterized in that, The adjustment mechanism also includes: An arc-shaped plate, fixedly installed on the outer side of the outer wall, has at least two positioning holes spaced apart along the rotation direction of the handle; and A positioning pin is inserted into a locking hole and a positioning hole on the handle to restrict the rotation of the handle.

6. The waste conveying device according to claim 1, characterized in that, The conveying mechanism includes: A lower auger, positioned along the transverse direction within the collection trough, horizontally conveys the impurities within the collection trough; and The lifting mechanism has its lower feed inlet connected to the output end of the lower agitator to convey the waste upwards.

7. The waste conveying device according to claim 6, characterized in that, The lifting mechanism includes: The second housing has an openable and closable lower cleaning door at the bottom; The first chain runs around the interior of the second housing; and Multiple scrapers are fixedly connected to the first chain to convey the impurities upward into the first housing.

8. The waste conveying device according to claim 7, characterized in that, It also includes a recycling facility, which comprises: The third housing has multiple through holes on its bottom wall, and one end of the third housing has an openable and closable upper cleaning door; and The upper auger is rotatably mounted inside the third housing.

9. The waste conveying device according to claim 8, characterized in that, It also includes a transmission device, which comprises: A belt is fitted onto the input pulley of the decoupling pulley to drive the decoupling pulley to rotate; The repeating chain wheel is coaxially fixed on the rotating shaft of the repeating chain wheel; The upper auger sprocket is fixedly connected to the input shaft of the upper auger; The lifting sprocket is fixedly connected to the drive sprocket of the lifting mechanism; The second chain sequentially passes around the repeating sprocket, the upper auger sprocket, and the lifting sprocket to transmit power; and The tensioning mechanism abuts against the slack side of the second chain to adjust the tension of the second chain.

10. A grain harvester, characterized in that, include: frame; The waste conveying device as described in any one of claims 1 to 9 is mounted on the frame; A threshing device is installed on the frame to perform the initial threshing of the grains; as well as The cleaning system, installed on the rack, includes: A cleaning sieve is used to perform initial screening of the grains after the first threshing. The impurities after screening enter the collection tank of the impurity lifting device. as well as The sorting screen is located below the recovery mechanism of the impurity lifting device to perform secondary screening of the impurities after they have passed through the impurity lifting device.

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